Soft computing-based controller design for a telecom rectifier

Presents controller design for a telecommunications rectifier based on analogue, digital and fuzzy logic approaches. The required output characteristics contain three modes of operation-constant-voltage, modified constant-power and constant-current. The proposed analogue solution is well proven in practical use and shows excellent performance. The digital solution is simulated and preliminary results predict its applicability. The fuzzy logic solution is outlined for constant-voltage and overload controllers. Preliminary simulations are promising but further optimization must be carried out.

General information

Publication status: Published
MoE publication type: Not Eligible
Organisations: Aalto University, University of Oulu, Efore Oy
Contributors: Gadoura, I., Suntio, T., Zenger, K., Vallittu, P.
Number of pages: 6
Pages: 80-85
Publication date: 1 Jan 1999

Host publication information

Title of host publication: SMCia 1999 - Proceedings of the 1999 IEEE Midnight-Sun Workshop on Soft Computing Methods in Industrial Applications
Publisher: Institute of Electrical and Electronics Engineers Inc.
Editor: Martikainen, J.
Article number: 782712
ISBN (Electronic): 0780352807, 9780780352803

Publication series

Name: SMCia 1999 - Proceedings of the 1999 IEEE Midnight-Sun Workshop on Soft Computing Methods in Industrial Applications
ASJC Scopus subject areas: Computer Science Applications, Control and Optimization
Source: Scopus
Source ID: 84952779655

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Simulation of oxygen exchange of SnO2 surface

Oxygen chemistry at the SnO2 surface is sensitive to the surrounding gas atmosphere, a reason why it is used in gas sensor applications. The operation principle of these sensors is usually based on the reactions of gas molecules with O2 - and O- ions adsorbed onto the surface. These surface reactions are observed as a measurable change in the electrical conductance of the sensor material. Here, we have studied the temperature dependency of the equilibrium coverages of O2 -, O- and surface/lattice oxygen content with lattice gas simulations. Earlier, we have studied oxygen reactions at the SnO2 surface using rate equation simulations. These models have been used as a basis of our simulations for adsorption, dissociation and desorption steps. Now, the physisorption step has been refined and the oxygen exchange between the adsorbed form and lattice has been added. Simulations have been carried out using an equilibrium lattice gas model. The conductance of the SnO2 material as a function of temperature is modeled in terms of the different oxygen components. We find that at low temperatures O2 - dominates at the SnO2 surface, while in the higher temperature region oxygen is in the form of O-. The transition temperature from O2 - dominating coverage to O- coverage is about 450 K. The importance of this finding lies in the fact that O- is the most reactive component in reducing the adsorbed gases, and therefore, it explains the temperature dependence of the sensitivity of SnO2 based sensors. The exchange process is slow at lower temperatures and accounts for the hysteresis like behavior at low temperatures. The simulated conductance dependence is in good agreement with the experimental measurements of Lantto et al.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: University of Oulu
Contributors: Pulkkinen, U., Rantala, T. T., Rantala, T. S., Lantto, V.
Number of pages: 1
Pages: 720
Publication date: Sep 1999
Peer-reviewed: Yes

Publication information

Journal: Computer Physics Communications
Volume: 121
ISSN (Print): 0010-4655
Ratings: 
  • Scopus rating (1999): SJR 1.235 SNIP 1.033
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Physics and Astronomy(all)
Source: Scopus
Source ID: 0033185516

Research output: Contribution to journalArticleScientificpeer-review

Critical study of Newmark-scheme on manifold of finite rotations

In this paper, we show that the usual material form of the Newmark-time-stepping scheme of finite rotations is only a simplified version of the correct formula. This is because spin material rotation vectors, angular velocity vectors and angular accelerations vectors belong to different tangential vector spaces of a manifold at separate time moments. We give corrected Newmark-time-stepping schemes for material description and for spatial description. © 2001 Elsevier Science B.V. All rights reserved.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Teknillinen mekaniikka ja optimointi
Contributors: Mäkinen, J.
Number of pages: 12
Pages: 817-828
Publication date: 21 Dec 2001
Peer-reviewed: Yes

Publication information

Journal: Computer Methods in Applied Mechanics and Engineering
Volume: 191
Issue number: 8-10
ISSN (Print): 0045-7825
Ratings: 
  • Scopus rating (2001): SJR 1.745 SNIP 1.494
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Computational Mechanics

Bibliographical note

Contribution: organisation=tme,FACT1=1

Source: researchoutputwizard
Source ID: 25525

Research output: Contribution to journalArticleScientificpeer-review

Classification of large graphs by a local tree decomposition

We present a binary graph classifier (BGC) which allows to classify large, unweighted, undirected graphs. This classifier is based on a local decomposition of the graph for each node in generalized trees. The obtained trees, forming the tree set of the graph, are then pairwise compared by a generalized tree-similarity-algorithm (GTSA) and the resulting similarity scores determine a characteristic similarity distribution of the graph. Classification in this context is defined as mutual consistency for all pure and mixed tree sets and their resulting similarity distributions in a graph class. We demonstrate the application of this method to an artificially generated data set and for data from microarray experiments of cervical cancer.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Stowers Institute for Medical Research, Technical University Darmstadt
Contributors: Emmert-Streib, F., Dehmert, M., Kilian, J.
Number of pages: 8
Pages: 200-207
Publication date: 2005

Host publication information

Title of host publication: Proceedings of the 2005 International Conference on Data Mining, DMIN'05
ISBN (Print): 9781932415797
ASJC Scopus subject areas: Computer Science Applications, Software
Source: Scopus
Source ID: 49749142261

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Stochastic Sznajd Model in open community

We extend the Sznajd Model for opinion formation by introducing persuasion probabilities for opinions. Moreover, we couple the system to an environment which mimics the application of the opinion. This results in a feedback, representing single-state opinion transitions in opposite to the two-state opinion transitions for persuading other people. We call this model opinion formation in an open community (OFOC). It can be seen as a stochastic extension of the Sznajd model for an open community, because it allows for a special choice of parameters to recover the original Sznajd model. We demonstrate the effect of feedback in the OFOC model by applying it to a, scenario in which, e.g., opinion B is worse then opinion A but easier explained to other people. Casually formulated we analyzed the question, how much better one has to be, in order to persuade other people, provided the opinion is worse. Our results reveal a linear relation between the transition probability for opinion B and the influence of the environment on B.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Stowers Institute for Medical Research
Contributors: Emmert-Streib, F.
Number of pages: 7
Pages: 1693-1699
Publication date: Nov 2005
Peer-reviewed: Yes

Publication information

Journal: International Journal of Modern Physics C
Volume: 16
Issue number: 11
ISSN (Print): 0129-1831
Ratings: 
  • Scopus rating (2005): SJR 0.525 SNIP 0.61
Original language: English
ASJC Scopus subject areas: Computational Theory and Mathematics, Computer Science Applications, Mathematical Physics, Physics and Astronomy(all), Statistical and Nonlinear Physics
Keywords: Markov process, Monte Carlo simulation, Small-world network, Sznajd Model
Source: Scopus
Source ID: 29244483126

Research output: Contribution to journalArticleScientificpeer-review

Labyrinth based left-handed metamaterials and sub-wavelength focusing of electromagnetic waves

We propose and demonstrate a resonant structure that solves two major problems related to the split-ring resonator structure. These major problems may be stated as the bianisotropy and electric coupling to the magnetic resonance. These two problems introduce difficulties in obtaining isotropic left-handed metamaterial mediums. The resonant structure that we propose here solves both of these problems. We further show that in addition to the magnetic resonance, when combined with a suitable wire medium, the structure that we propose exhibits left-handed transmission band. We further demonstrate the sub-wavelength focusing of electromagnetic waves by use of a two dimensional labyrinth based metamaterial. Our experimental results showed that it is possible to focus the source field with half widths as small as λ/4 by using the labyrinth based metamaterial.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Bilkent University
Contributors: Ozbay, E., Bulu, I., Caglayan, H.
Publication date: 2006

Host publication information

Title of host publication: Photonic Crystal Materials and Devices IV
Volume: 6128
Article number: 612813
ISBN (Print): 0819461709, 9780819461704

Publication series

Name: Proceedings of SPIE
Publisher: SPIE
Volume: 6128
ISSN (Print): 0277-786X
ISSN (Electronic): 1996-756X
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Computer Science Applications, Applied Mathematics, Electrical and Electronic Engineering
Keywords: Left-handed medium, Magnetic Resonance, Metamaterial, Split-ring Resonator, Sub-wavelength Focusing

Bibliographical note

EXT="Caglayan, Humeyra"

Source: Scopus
Source ID: 33745626124

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

A heterosynaptic learning rule for neural networks

In this article we intoduce a novel stochastic Hebb-like learning rule for neural networks that is ueurobiologically motivated. This learning rule combines features of unsupervised (Hebbian) and supervised (reinforcement) learning and is stochastic with respect to the selection of the time points when a synapse is modified. Moreover, the learning rule does not only affect the synapse between pre- and postsynaptic neuron, which is called homosynaptic plasticity, but effects also further remote synapses of the preand postsynaptic neuron. This more complex form of synaptic plasticity has recently come under investigations in neurobiology and is called heterosynaptic plasticity. We demonstrate that this learning rule is useful in training neural networks by learning parity functions including the exclusive-or (XOR) mapping in a multilayer feed-forward network. We find, that our stochastic learning rule works well, even in the presence of noise. Importantly, the mean learning time increases with the number of patterns to be learned polynomially, indicating efficient learning.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Institut für Theoretische Physik, University of Bremen, Stowers Institute for Medical Research
Contributors: Emmert-Streib, F.
Number of pages: 20
Pages: 1501-1520
Publication date: Oct 2006
Peer-reviewed: Yes

Publication information

Journal: International Journal of Modern Physics C
Volume: 17
Issue number: 10
ISSN (Print): 0129-1831
Ratings: 
  • Scopus rating (2006): SJR 0.498 SNIP 0.581
Original language: English
ASJC Scopus subject areas: Computational Theory and Mathematics, Computer Science Applications, Mathematical Physics, Physics and Astronomy(all), Statistical and Nonlinear Physics
Keywords: Biological reinforcement learning, Hebb-like learning, Heterosynaptic plasticity, Neural networks
Source: Scopus
Source ID: 33750574569

Research output: Contribution to journalArticleScientificpeer-review

Global information processing in gene networks: Fault tolerance

In this paper we study the fault tolerance of gene networks. We assume single gene knockouts and investigate the effect this kind of perturbation has on the communication between genes globally. For our study we use directed scale-free networks resembling gene networks, e.g., signaling or proteinprotein interaction networks, and define a Markov process based on the network topology to model communication. This allows us to evaluate the spread of information in the network and, hence, detect differences due to single gene knockouts in the gene-gene communication asymptotically.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Stowers Institute for Medical Research, TU Vienna
Contributors: Emmert-Streib, F., Dehmer, M.
Number of pages: 4
Pages: 326-329
Publication date: 2007

Host publication information

Title of host publication: Proceedings of the Bio-Inspired Models of Network, Information, and Computing Systems, Bionetics 2007
Article number: 4610138
ISBN (Print): 9789639799059
ASJC Scopus subject areas: Computational Theory and Mathematics, Computer Science Applications, Information Systems
Keywords: Gene networks, Information processing, Information theory, Robustness, Scale-free networks
Source: Scopus
Source ID: 53149089468

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Nonlinear time series prediction based on a power-law noise model

In this paper we investigate the influence of a power-law noise model, also called noise, on the performance of a feed-forward neural network used to predict time series. We introduce an optimization procedure that optimizes the parameters the neural networks by maximizing the likelihood function based on the power-law model. We show that our optimization procedure minimizes the mean squared leading to an optimal prediction. Further, we present numerical results applying method to time series from the logistic map and the annual number of sunspots demonstrate that a power-law noise model gives better results than a Gaussian model.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Stowers Institute for Medical Research, TU Vienna
Contributors: Emmert-Streib, F., Dehmer, M.
Number of pages: 14
Pages: 1839-1852
Publication date: Dec 2007
Peer-reviewed: Yes

Publication information

Journal: International Journal of Modern Physics C
Volume: 18
Issue number: 12
ISSN (Print): 0129-1831
Ratings: 
  • Scopus rating (2007): SJR 0.502 SNIP 0.524
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Computational Theory and Mathematics, Physics and Astronomy(all), Statistical and Nonlinear Physics, Mathematical Physics
Keywords: time series prediction, maximum likelihood, Monte Carlo method, feed-forward, neural network., SELF-ORGANIZED CRITICALITY, NEURAL-NETWORKS, OPTIMIZATION, EXPLANATION
Source: Scopus
Source ID: 38149090517

Research output: Contribution to journalArticleScientificpeer-review

Measurement theory and dimensional analysis: Methodological impact on the comparison and evaluation process

Comparison and ranking of solutions are central tasks of the design process. Designers have to deal with decisions simultaneously involving multiple criteria. Those criteria are often inconsistent in the sense that they are expressed according to different types of metrics. This means that usual engineering performance indicators are expressed according to physical quantities (i.e. SI system) and indicators such as preference functions can be "measured" by using other type of qualitative metrics. This aspect limits the scientific consistency of design because a coherent scientific framework will at first require the creation of a unified list of fundamental properties. A combined analysis of the measurement theory, the General Design Theory (GDT) and the dimensional analysis theory give an interesting insight in order to create guidelines for establishing a coherent measurement system. This article establishes a list of fundamental requirements. We expect that these guidelines can help engineers and designers to be more aware of the drawbacks linked with the use of wrong comparison procedures and limitations associated with the use of weak measurement scales. This article makes an analysis of the fundamental aspects available in major scientific publications related to comparison, provides a synthesis of these basic concepts and unifies those concepts together from a designing perspective. A practical design methodology using the fundamental results of this article as prerequisites has been implemented by the authors.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: LGI, LGI Laboratory, Helsinki University of Technology, Aalto University
Contributors: Coatanéa, E., Yannou, B., Honkala, S., Lajunen, A., Saarelainen, T., Makkonen, P.
Number of pages: 10
Pages: 173-182
Publication date: 2008

Host publication information

Title of host publication: 19th International Conference on Design Theory and Methodology and 1st International Conference on Micro and Nano Systems, presented at - 2007 ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE2007
Publisher: AMER SOC MECHANICAL ENGINEERS
ISBN (Print): 978-0-7918-4804-3
ASJC Scopus subject areas: Computer Graphics and Computer-Aided Design, Computer Science Applications, Mechanical Engineering, Modelling and Simulation
Keywords: ENGINEERING DESIGN
Source: WOS
Source ID: 000254167700017

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Network classes and graph complexity measures

In this paper, we propose an information-theoretic approach to discriminate graph classes structurally. For this, we use a measure for determining the structural information content of graphs. This complexity measure is based on a special information functional that quantifies certain structural information of a graph. To demonstrate that the complexity measure captures structural information meaningfully, we interpret some numerical results.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Center for Mathematics Probability and Statistics, Technical University Darmstadt, Computational Biology and Machine Learning Lab., Faculty of Medicine, Health and Life Sciences, Queen's University, Belfast, Northern Ireland
Contributors: Dehmer, M., Borgert, S., Emmert-Streib, F.
Number of pages: 8
Pages: 77-84
Publication date: 2008

Host publication information

Title of host publication: Proc. - 2008 1st International Conference on Complexity and Intelligence of the Artificial and Natural Complex Systems. Medical Applications of the Complex Systems. Biomedical Computing, CANS 2008
Article number: 5231507
ISBN (Print): 9780769536217
ASJC Scopus subject areas: Artificial Intelligence, Computer Science Applications, Biomedical Engineering
Keywords: Entropy, Network complexity measures, Network modelling
Source: Scopus
Source ID: 70350557662

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Towards a channel capacity of communication networks

We propose a new measure that quantifies the communication capabilities of networks. More precisely, in this paper we show that the well known channel capacity of a memoryless channel, introduced in information theory, can be defined for arbitrary directed networks. We argue that this new measure, which we call network channel capacity, might be useful for characterizing and classifying communication networks. As first examples we present results for random networks and discuss practical implications.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computational Biology and Machine Learning, Queen's University, Belfast, Northern Ireland, Center for Mathematics Probability and Statistics
Contributors: Emmert-Streib, F., Dehmer, M.
Number of pages: 6
Pages: 94-99
Publication date: 2008

Host publication information

Title of host publication: Proc. - 2008 1st International Conference on Complexity and Intelligence of the Artificial and Natural Complex Systems. Medical Applications of the Complex Systems. Biomedical Computing, CANS 2008
Article number: 5231493
ISBN (Print): 9780769536217
ASJC Scopus subject areas: Artificial Intelligence, Computer Science Applications, Biomedical Engineering
Keywords: Channel capacity, Information theory, Markov chain, Networks
Source: Scopus
Source ID: 70350534877

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Robustness in scale-free networks: Comparing directed and undirected networks

In this paper, scale-free networks and their functional robustness with respect to structural perturbations of the network are studied. Two types of perturbations are distinguished: random perturbations and attacks. The robustness of directed and undirected scale-free networks is studied numerically for two different measures and the obtained results are compared. For random perturbations, the results indicate that the strength of the perturbation plays a crucial role. In general, directed scale-free networks are more robust than undirected scale-free networks.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Biostatistics and Genome Sciences, TU Vienna
Contributors: Emmert-Streib, F., Dehmer, M.
Number of pages: 10
Pages: 717-726
Publication date: May 2008
Peer-reviewed: Yes

Publication information

Journal: International Journal of Modern Physics C
Volume: 19
Issue number: 5
ISSN (Print): 0129-1831
Ratings: 
  • Scopus rating (2008): SJR 0.407 SNIP 0.552
Original language: English
ASJC Scopus subject areas: Computational Theory and Mathematics, Computer Science Applications, Mathematical Physics, Physics and Astronomy(all), Statistical and Nonlinear Physics
Keywords: Functional robustness, Markov chain, Scale-free networks
Source: Scopus
Source ID: 47049131368

Research output: Contribution to journalArticleScientificpeer-review

Mobile Journalist Toolkit: A field study on producing news articles with a mobile device

Today's handheld mobile devices with advanced multimedia capabilities and wireless broadband connectivity have emerged as potential new tools for journalists to produce news articles. It is envisioned that they could enable faster, more authentic, and more efficient news production, and many large news producing organizations, including Reuters and BBC, have recently been experimenting with them. In this paper, we present a field study on using mobile devices to produce news articles. During the study, a group of 19 M.A.-level journalism students used the Mobile Journalist Toolkit, a lightweight set of tools for mobile journalist work built around the Nokia N82 camera phone, to produce an online news blog. Our results indicate that while the mobile device cannot completely replace the traditional tools, for some types of journalist tasks they provide major benefits over the traditional tools, and are thus a useful addition to the journalist's toolbox.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Software Systems, Nokia
Contributors: Jokela, T., Väätäjä, H., Koponen, T.
Number of pages: 8
Pages: 45-52
Publication date: 2009

Host publication information

Title of host publication: MindTrek 2009 - 13th International Academic MindTrek Conference: Everyday Life in the Ubiquitous Era
ISBN (Print): 9781605586335
ASJC Scopus subject areas: Computer Science Applications, Human-Computer Interaction, Software
Keywords: Camera phones, Field study, Journalism, Mobile devices, Multimedia publishing
Source: Scopus
Source ID: 76749139559

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

The magical world of metamaterials

We review experimental and theoretical studies performed on left-handed metamaterials (LHM). The metamaterials exhibit quiet unusual electromagnetic properties such as negative refraction, negative phase velocity, subwavelength focusing, subwavelength cavities and enhanced transmission.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Nanotechnology Research Center, Bilkent University
Contributors: Caglayan, H., Ozbay, E.
Publication date: 2009

Host publication information

Title of host publication: Photonic Materials, Devices, and Applications III
Volume: 7366
Article number: 73660X
ISBN (Print): 9780819476401

Publication series

Name: Proceedings of SPIE
Publisher: SPIE
Volume: 7366
ISSN (Print): 0277-786X
ISSN (Electronic): 1996-756X
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Computer Science Applications, Applied Mathematics, Electrical and Electronic Engineering
Keywords: Left-handed metamaterial, Metamaterials, Negative refractive index, Superlens

Bibliographical note

EXT="Caglayan, Humeyra"

Source: Scopus
Source ID: 70349983117

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Towards certifying the testing process of open-source software: New challenges or old methodologies?

To improve both the quality and the trustworthiness perception of Open Source Software (OSS) products, we introduce the new idea of certifying the testing process of an OSS system. While the global certification of an OSS product is an emerging research field, the idea of certifying only its testing process has never been studied, conversely to the case of Closed Source Software (CSS) products. The certification of the testing process has a twofold goal: simplify the process of testing OSS products by guiding developers in identifying the proper testing strategies and the limitations of their existing testing plans; simplify the selection of equivalent OSS and CSS products by evaluating the certificates released by the companies. Specifically, in this paper we discuss 1) a set of issues, inherent to OSS, that must be taken into account when testing the OSS product; 2) a preliminary methodology that suggests how to certificate the testing process of OSS products; 3) the BusyBox case study that shows how our idea can be applied to real-life OSS.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Università degli Studi Dell'Insubria, Former organisation of the author
Contributors: Morasca, S., Taibi, D., Tosi, D.
Number of pages: 6
Pages: 25-30
Publication date: 2009

Host publication information

Title of host publication: Proceedings of the 2009 ICSE Workshop on Emerging Trends in Free/Libre/Open Source Software Research and Development, FLOSS 2009
Article number: 5071356
ISBN (Print): 9781424437207
ASJC Scopus subject areas: Computer Science Applications, Information Systems, Software
Source: Scopus
Source ID: 70349739151

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Wrench feasible workspace analysis of cable-driven parallel manipulators using LMI approach

Workspace analysis is one of the most important issues in robotic manipulator design. This paper introduces a systematic method of analysis the wrench feasible workspace for general redundant cable-driven parallel manipulators. In this method, wrench feasible workspace is formulated in term of linear matrix inequalities and projective method is used for solving them. This method is one of the most efficient interiorpoint methods with a polynomial-time complexity. Moreover, the notion of dexterous workspace is defined, which can be determined for redundant cable driven manipulators exerting a worst case external wrench at the end effector. A detailed case study of the wrench feasible workspace and dexterous workspace determination are included for a six DOF, eight actuated cable-driven redundant parallel manipulator.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: K. N. Toosi University of Technology
Contributors: Loloei, A. Z., Mohammadi Aref, M., Taghirad, H. D.
Number of pages: 6
Pages: 1034-1039
Publication date: 2009

Host publication information

Title of host publication: IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM
Article number: 5229723
ISBN (Print): 9781424428533
ASJC Scopus subject areas: Electrical and Electronic Engineering, Control and Systems Engineering, Computer Science Applications, Software
Source: Scopus
Source ID: 70350447954

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Information processing in the transcriptional regulatory network of yeast: Functional robustness

Background: Gene networks are considered to represent various aspects of molecular biological systems meaningfully because they naturally provide a systems perspective of molecular interactions. In this respect, the functional understanding of the transcriptional regulatory network is considered as key to elucidate the functional organization of an organism. Results: In this paper we study the functional robustness of the transcriptional regulatory network of S. cerevisiae. We model the information processing in the network as a first order Markov chain and study the influence of single gene perturbations on the global, asymptotic communication among genes. Modification in the communication is measured by an information theoretic measure allowing to predict genes that are 'fragile' with respect to single gene knockouts. Our results demonstrate that the predicted set of fragile genes contains a statistically significant enrichment of so called essential genes that are experimentally found to be necessary to ensure vital yeast. Further, a structural analysis of the transcriptional regulatory network reveals that there are significant differences between fragile genes, hub genes and genes with a high betweenness centrality value. Conclusion: Our study does not only demonstrate that a combination of graph theoretical, information theoretical and statistical methods leads to meaningful biological results but also that such methods allow to study information processing in gene networks instead of just their structural properties.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Computational Biology and Machine Learning, Queen's University, Belfast, Northern Ireland, Center for Mathematics Probability and Statistics
Contributors: Emmert-Streib, F., Dehmer, M.
Publication date: 19 Mar 2009
Peer-reviewed: Yes

Publication information

Journal: BMC Systems Biology
Volume: 3
Article number: 35
ISSN (Print): 1752-0509
Ratings: 
  • Scopus rating (2009): SJR 1.493 SNIP 0.974
Original language: English
ASJC Scopus subject areas: Molecular Biology, Structural Biology, Applied Mathematics, Modelling and Simulation, Computer Science Applications
Source: Scopus
Source ID: 65649087188

Research output: Contribution to journalArticleScientificpeer-review

Hierarchical coordination of periodic genes in the cell cycle of Saccharomyces cerevisiae

Background: Gene networks are a representation of molecular interactions among genes or products thereof and, hence, are forming causal networks. Despite intense studies during the last years most investigations focus so far on inferential methods to reconstruct gene networks from experimental data or on their structural properties, e.g., degree distributions. Their structural analysis to gain functional insights into organizational principles of, e.g., pathways remains so far under appreciated. Results: In the present paper we analyze cell cycle regulated genes in S. cerevisiae. Our analysis is based on the transcriptional regulatory network, representing causal interactions and not just associations or correlations between genes, and a list of known periodic genes. No further data are used. Partitioning the transcriptional regulatory network according to a graph theoretical property leads to a hierarchy in the network and, hence, in the information flow allowing to identify two groups of periodic genes. This reveals a novel conceptual interpretation of the working mechanism of the cell cycle and the genes regulated by this pathway. Conclusion: Aside from the obtained results for the cell cycle of yeast our approach could be exemplary for the analysis of general pathways by exploiting the rich causal structure of inferred and/or curated gene networks including protein or signaling networks.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Computational Biology and Machine Learning Lab., Faculty of Medicine, Health and Life Sciences, Queen's University, Belfast, Northern Ireland, Institute for Bioinformatics and Translational Research
Contributors: Emmert-Streib, F., Dehmer, M.
Publication date: 20 Jul 2009
Peer-reviewed: Yes

Publication information

Journal: BMC Systems Biology
Volume: 3
Article number: 76
ISSN (Print): 1752-0509
Ratings: 
  • Scopus rating (2009): SJR 1.493 SNIP 0.974
Original language: English
ASJC Scopus subject areas: Molecular Biology, Structural Biology, Applied Mathematics, Modelling and Simulation, Computer Science Applications
Source: Scopus
Source ID: 68949220295

Research output: Contribution to journalArticleScientificpeer-review

On entropy-based molecular descriptors: Statistical analysis of real and synthetic chemical structures

This paper presents an analysis of entropy-based molecular descriptors. Specifically, we use real chemical structures, as well as synthetic isomeric structures, and investigate properties of and among descriptors with respect to the used data set by a statistical analysis. Our numerical results provide evidence that synthetic chemical structures are notably different to real chemical structures and, hence, should not be used to investigate molecular descriptors. Instead, an analysis based on real chemical structures is favorable. Further, we find strong hints that molecular descriptors can be partitioned into distinct classes capturing complementary information.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: TU Vienna, Technical University Darmstadt, Computational Biology and Machine Learning, School of Medicine
Contributors: Dehmer, M., Varmuza, K., Borgert, S., Emmert-Streib, F.
Number of pages: 9
Pages: 1655-1663
Publication date: 27 Jul 2009
Peer-reviewed: Yes

Publication information

Journal: Journal of Chemical Information and Modeling
Volume: 49
Issue number: 7
ISSN (Print): 1549-9596
Ratings: 
  • Scopus rating (2009): SJR 1.039 SNIP 1.219
Original language: English
ASJC Scopus subject areas: Chemical Engineering(all), Chemistry(all), Computer Science Applications, Library and Information Sciences
Source: Scopus
Source ID: 68149167631

Research output: Contribution to journalArticleScientificpeer-review

Unite and conquer: Univariate and multivariate approaches for finding differentially expressed gene sets

Motivation: Recently, many univariate and several multivariate approaches have been suggested for testing differential expression of gene sets between different phenotypes. However, despite a wealth of literature studying their performance on simulated and real biological data, still there is a need to quantify their relative performance when they are testing different null hypotheses. Results: In this article, we compare the performance of univariate and multivariate tests on both simulated and biological data. In the simulation study we demonstrate that high correlations equally affect the power of both, univariate as well as multivariate tests. In addition, for most of them the power is similarly affected by the dimensionality of the gene set and by the percentage of genes in the set, for which expression is changing between two phenotypes. The application of different test statistics to biological data reveals that three statistics (sum of squared t-tests, Hotelling's T2, N-statistic), testing different null hypotheses, find some common but also some complementing differentially expressed gene sets under specific settings. This demonstrates that due to complementing null hypotheses each test projects on different aspects of the data and for the analysis of biological data it is beneficial to use all three tests simultaneously instead of focusing exclusively on just one.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: University of Rochester Medical Center, Computational Biology and Machine Learning, Queen's University, Belfast, Northern Ireland
Contributors: Glazko, G. V., Emmert-Streib, F.
Number of pages: 7
Pages: 2348-2354
Publication date: Sep 2009
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 25
Issue number: 18
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2009): SJR 3.111 SNIP 1.834
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability
Source: Scopus
Source ID: 69849105388

Research output: Contribution to journalArticleScientificpeer-review

A framework for building behavioral models for design-stage failure identification using dimensional analysis

In this paper, a design-stage failure identification framework is proposed using a modeling and simulation approach based on Dimensional Analysis and qualitative physics. The proposed framework is intended to provide a new approach to model the behavior in the Functional-Failure Identification and Propagation (FFIP) framework, which estimates potential faults and their propagation paths under critical event scenarios. The initial FFIP framework is based on combining hierarchical system models of functionality and configuration, with behavioral simulation and qualitative reasoning. This paper proposes to develop a behavioral model derived from information available at the configuration level. Specifically, the new behavioral model uses design variables, which are associated with units and quantities (i.e., Mass, Length, Time, etc...). The proposed framework continues the work to allow the analysis of functional failures and fault propagation at a highly abstract system concept level before any potentially high-cost design commitments are made. The main contribution in this paper consists of developing component behavioral models based on the combination of fundamental design variables used to describe components and their units or quantities, more precisely describing components' behavior. Copyright © 2010 by ASME.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Oregon State University, Helsinki University of Technology, Aalto University
Contributors: Coatanéa, E., Ritola, T., Tumer, I. Y., Jensen, D.
Number of pages: 11
Pages: 591-601
Publication date: 2010

Host publication information

Title of host publication: Proceedings of the ASME Design Engineering Technical Conference
Volume: 5
Publisher: AMER SOC MECHANICAL ENGINEERS
ISBN (Print): 978-0-7918-4413-7
ASJC Scopus subject areas: Mechanical Engineering, Computer Graphics and Computer-Aided Design, Computer Science Applications, Modelling and Simulation
Source: WOS
Source ID: 000320567700053

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Revealing differences in gene network inference algorithms on the network level by ensemble methods

Motivation: The inference of regulatory networks from large-scale expression data holds great promise because of the potentially causal interpretation of these networks. However, due to the difficulty to establish reliable methods based on observational data there is so far only incomplete knowledge about possibilities and limitations of such inference methods in this context. Results: In this article, we conduct a statistical analysis investigating differences and similarities of four network inference algorithms, ARACNE, CLR, MRNET and RN, with respect to local network-based measures. We employ ensemble methods allowing to assess the inferability down to the level of individual edges. Our analysis reveals the bias of these inference methods with respect to the inference of various network components and, hence, provides guidance in the interpretation of inferred regulatory networks from expression data. Further, as application we predict the total number of regulatory interactions in human B cells and hypothesize about the role of Myc and its targets regarding molecular information processing.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: School of Medicine, Computational Biology and Machine Learning
Contributors: Altay, G., Emmert-Streib, F.
Number of pages: 7
Pages: 1738-1744
Publication date: 25 May 2010
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 26
Issue number: 14
Article number: btq259
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2010): SJR 3.661 SNIP 1.884
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability, Medicine(all)
Source: Scopus
Source ID: 77954484005

Research output: Contribution to journalArticleScientificpeer-review

Inferring the conservative causal core of gene regulatory networks

Background: Inferring gene regulatory networks from large-scale expression data is an important problem that received much attention in recent years. These networks have the potential to gain insights into causal molecular interactions of biological processes. Hence, from a methodological point of view, reliable estimation methods based on observational data are needed to approach this problem practically.Results: In this paper, we introduce a novel gene regulatory network inference (GRNI) algorithm, called C3NET. We compare C3NET with four well known methods, ARACNE, CLR, MRNET and RN, conducting in-depth numerical ensemble simulations and demonstrate also for biological expression data from E. coli that C3NET performs consistently better than the best known GRNI methods in the literature. In addition, it has also a low computational complexity. Since C3NET is based on estimates of mutual information values in conjunction with a maximization step, our numerical investigations demonstrate that our inference algorithm exploits causal structural information in the data efficiently.Conclusions: For systems biology to succeed in the long run, it is of crucial importance to establish methods that extract large-scale gene networks from high-throughput data that reflect the underlying causal interactions among genes or gene products. Our method can contribute to this endeavor by demonstrating that an inference algorithm with a neat design permits not only a more intuitive and possibly biological interpretation of its working mechanism but can also result in superior results.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Queen's University, Belfast, Northern Ireland, Computational Biology and Machine Learning Lab., Faculty of Medicine, Health and Life Sciences
Contributors: Altay, G., Emmert-Streib, F.
Publication date: 28 Sep 2010
Peer-reviewed: Yes

Publication information

Journal: BMC Systems Biology
Volume: 4
Article number: 132
ISSN (Print): 1752-0509
Ratings: 
  • Scopus rating (2010): SJR 1.832 SNIP 1.057
Original language: English
ASJC Scopus subject areas: Molecular Biology, Structural Biology, Applied Mathematics, Modelling and Simulation, Computer Science Applications
Source: Scopus
Source ID: 77957141016

Research output: Contribution to journalArticleScientificpeer-review

A design tool for efficient mapping of multimedia applications onto heterogeneous platforms

Development of multimedia systems on heterogeneous platforms is a challenging task with existing design tools due to a lack of rigorous integration between high level abstract modeling, and low level synthesis and analysis. In this paper, we present a new dataflow-based design tool, called the targeted dataflow interchange format (TDIF), for design, analysis, and implementation of embedded software for multimedia systems. Our approach provides novel capabilities, based on the principles of task-level dataflow analysis, for exploring and optimizing interactions across application behavior; operational context; heterogeneous platforms, including high performance embedded processing architectures; and implementation constraints.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Signal Processing Research Community (SPRC), University of Maryland, Department of Electrical and Computer Engineering
Contributors: Shen, C. C., Wu, H. H., Sane, N., Plishker, W., Bhattacharyya, S. S.
Publication date: 2011

Host publication information

Title of host publication: Electronic Proceedings of the 2011 IEEE International Conference on Multimedia and Expo, ICME 2011
Article number: 6011952
ISBN (Print): 9781612843490
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: dataflow graphs, design tools, Embedded signal processing, software synthesis
Source: Scopus
Source ID: 80155156918

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

A probability-based approach to modeling the risk of unauthorized propagation of information in on-line social networks

The unauthorized propagation of information is an important problem in the Internet, especially because of the increasing popularity of On-line Social Networks. To address this issue, many access control mechanisms have been proposed so far, but there is still a lack of techniques to evaluate the risk of unauthorized flow of information within social networks. This paper introduces a probability-based approach to modeling the likelihood that information propagates from one social network user to users who are not authorized to access it. The approach is demonstrated via an example, to show how it can be applied in practical cases.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Università degli Studi Dell'Insubria
Contributors: Carminati, B., Ferrari, E., Morasca, S., Taibi, D.
Number of pages: 11
Pages: 51-61
Publication date: 2011

Host publication information

Title of host publication: CODASPY'11 - Proceedings of the 1st ACM Conference on Data and Application Security and Privacy
ISBN (Print): 9781450304665
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: Access control, Information leakage, Privacy, Social networks
Source: Scopus
Source ID: 79952798687

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Bio-inspired service management framework: Green data-centres case study

Following the huge growth in usage over the last 10 years, the Internet has become a critical business and social tool. In the future however, this popularity will continue to rise, with the Internet evolving into a full scale distributed service platform, offering a plethora of services from communications to business, entertainment and much more. These services will be more dynamic and sophisticated providing a range of complex capabilities. However, this dynamic service environment will lead to overwhelming management problems if not dealt with adequately. At the same time, society is now acutely aware of the significant energy burden the communications industry is becoming. With these two trends in mind we propose a biologically-inspired service framework which supports services intelligently solving a number of management problems. We then as a case study application, use this framework to address the new, emerging problem of a sustainable future internet by migrating services to new, greener locations.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Wireless Communications and Positioning (WICO), Waterford Institute of Technology
Contributors: Carroll, R., Balasubramaniam, S., Botvich, D., Donnelly, W.
Number of pages: 6
Pages: 226-231
Publication date: 2011

Host publication information

Title of host publication: Proceedings - 25th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2011
Article number: 5763678
ISBN (Print): 9780769543383
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: Bio-inspired Services, Genetic Algorithm, Green Data-centres
Source: Scopus
Source ID: 79957554186

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Database-driven tool support for DisCo executable specifications

In spite of the advances in theory of formal specifications, they have not gained a wide popularity in the software development industry. This could be due to difficulties in understanding them or positioning them into the current work practices, however, we believe that one major problem is that the tool support still does not make the use of the formal specifications easy enough for the software developer. We discuss the required functionality for comprehensive tool support for executable DisCo specifications, and propose a tool architecture based on database technology, and finally, discuss our implementation of the core part of the tool set.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research Community on Data-to-Decision (D2D), Mathematical modelling with wide societal impact (MathImpact)
Contributors: Nummenmaa, J., Nummenmaa, T.
Number of pages: 11
Pages: 44-54
Publication date: 2011

Host publication information

Title of host publication: SPLST'11 - Proceedings 12th Symposium on Programming Languages and Software Tools
ISBN (Print): 9789949231782
ASJC Scopus subject areas: Computer Science Applications, Software
Source: Scopus
Source ID: 84869824785

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Influence factors for sharing open science and open educational resources through social networking services

In a knowledge society it is crucial to serve the need for accurate and up-to-date knowledge produced by scientists. The possibilities of electronic communication through the use of social software provides means for open discourse and offers easier ways to make scientific and educational resources available that can be used in knowledge management and e-learning. Within this paper, we describe how researchers share knowledge in the form of artefacts. These artefacts consist of open science and open educational resources. The focus will be on understanding the influence factors for sharing these artefacts with social networking services. Through the research, an improved understanding of the decision making and sharing habits of a researcher will be obtained for the use of social software for globally distributed and open scientific communication.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Managing digital industrial transformation (mDIT), University of Jyväskylä
Contributors: Kalb, H., Pirkkalainen, H., Pawlowski, J., Schoop, E.
Number of pages: 10
Pages: 23-32
Publication date: 2011

Host publication information

Title of host publication: 6th Conference on Professional Knowledge Management: From Knowledge to Action - Proceedings
Volume: P-182
Publisher: Gesellschaft fur Informatik (GI)
ISBN (Print): 978-388579276-5
ASJC Scopus subject areas: Computer Science Applications
Source: Scopus
Source ID: 84901471135

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Multicolor nonlinear pulse compression by consecutive optical parametric amplification in quasi-phase matched structures

Simultaneous generation of the 2nd and 3rd harmonic, excited by linearly frequency-chirped fundamental pulse in quasiphase matched grating with linearly varying inverse domain sizes has been studied numerically with taking into account effects of the group velocity mismatches and dispersions. Mechanisms of efficient nonlinear pulse compressions and conversion efficiencies of the generated harmonics have been analyzed.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Frontier Photonics, Academy of Sciences of the Republic of Uzbekistan, Tashkent State Technical University, Nonlinear Optics and OptoElectronics Lab, University “Roma Tre”
Contributors: Sapaev, U. K., Yusupov, D. B., Assanto, G.
Publication date: 2011

Host publication information

Title of host publication: ICONO 2010: International Conference on Coherent and Nonlinear Optics
Volume: 7993
Article number: 79930Q
ISBN (Print): 9780819485663
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Cascading, Lithium niobate, Nonlinear pulse compression, Parametric effects, Quasi-phase matching, Simultaneous frequency doubling and tripling
Source: Scopus
Source ID: 79951653950

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

On delay distribution in IEEE 802.11 wireless networks

IEEE 802.11 wireless networks have received much attention over the past number of years. Still certain aspects of behavior of wireless networks have not been studied well enough. For example, understanding MAC layer packet delay distribution remains challenging yet. However, obtaining such distribution is highly beneficial for modeling QoS provided by wireless networks. This paper proposes a way of obtaining MAC delay distribution in case of single-hop networks. The proposed way is based on theory of terminating renewal processes and delivers approximation of good precision.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Wireless Communications and Positioning (WICO), Waterford Institute of Technology, Telecommunications Software and Systems Group (TSSG)
Contributors: Ivanov, S., Botvich, D., Balasubramaniam, S.
Number of pages: 3
Pages: 254-256
Publication date: 2011

Host publication information

Title of host publication: 16th IEEE Symposium on Computers and Communications, ISCC'11
Article number: 5983849
ISBN (Print): 9781457706783
ASJC Scopus subject areas: Software, Signal Processing, Mathematics(all), Computer Science Applications, Computer Networks and Communications
Keywords: delay distribution, IEEE 802.11, MAC layer, modeling
Source: Scopus
Source ID: 80052734083

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Performance evaluation of distributed NoTA applications on multi-core platforms

For future applications running on nomadic devices operating in smart spaces, the availability of the services and the quest for better alternative services will go hand in hand to enable the best-possible experience for the end-user. To realize it, a service-level interoperability solution must be devised that would enable applications to access services over heterogeneous platforms and various transport technologies. The recent extension of the Network-on-Terminal-Architecture (NoTA) supports service-level interoperability between mobile devices via a device interconnect protocol (NoTA DIP), enabling applications to access and discover services over multiple transport technologies in a seamless manner. A brisk performance evaluation phase is required for evaluating the feasibility of new NoTA applications on modern multi-core based mobile device platforms. To achieve this goal, NoTA Service Oriented Architecture (SOA) application components. i.e., Application Nodes (ANs) and Service Nodes (ANs) are first refined to encompassing processes and then to platform services and functions to form a layered application architecture. In next step, the NoTA SOA application model layers are mapped to ABSOLUT workload model layers employed in performance simulation. Furthermore, the ABSOLUT workload models corresponding to different NoTA DIP implementations for example NoTA DIP kernel implementation and NOTA DIP Daemon mode must be modeled and integrated to ABSOLUT. The approach is experimented with a case study. The modeled components and approach is not limited to NoTA SOA and can be used for the performance evaluation of other distributed service oriented application architectures. MARTE UML2.0 profile, Papyrus UML 2.0 modeling tool and SystemC were used for modeling and simulation.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research group: System-on-Chip for GNSS, Wireless Communications and Cyber-Physical Embedded Computing, Department of Computer Systems, Wireless Communications and Positioning (WICO), VTT Technical Research Centre of Finland
Contributors: Khan, S., Saastamoinen, J., Huusko, J., Nurmi, J.
Publication date: 2011

Host publication information

Title of host publication: Proceedings - 2011 IEEE 2nd International Conference on Networked Embedded Systems for Enterprise Applications, NESEA 2011
Article number: 6144931
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: NoTA, Performance Simulation, SystemC
Source: Scopus
Source ID: 84857582538

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

PETMEI 2011: The 1st international workshop on pervasive eye tracking and mobile eye-based interaction

Recent developments in mobile eye tracking equipment and automated eye movement analysis point the way toward unobtrusive eye-based human-computer interfaces that are pervasively usable in everyday life. We call this new paradigm pervasive eye tracking - continuous eye monitoring and analysis 24/7. PETMEI 2011 provides a forum for researcher from human-computer interaction, context-aware computing, and eye tracking to discuss techniques and applications that go beyond classical eye tracking and stationary eye-based interaction. We aim to discuss the implications of pervasive eye tracking for context-aware computing and to identify the key research challenges of mobile eye-based interaction. The long-term goal is to create a strong interdisciplinary research community linking these research fields together and to establish the workshop as the premier forum for research on pervasive eye tracking and mobile eye-based interaction.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA), Lancaster University, Clemson University
Contributors: Bulling, A., Duchowski, A. T., Majaranta, P.
Number of pages: 2
Pages: 627-628
Publication date: 2011

Host publication information

Title of host publication: UbiComp'11 - Proceedings of the 2011 ACM Conference on Ubiquitous Computing
ISBN (Print): 9781450309103
ASJC Scopus subject areas: Computational Theory and Mathematics, Computer Science Applications
Keywords: activity and context recognition, cognition-awareness, eye movement analysis, eye tracking, eye-based interaction
Source: Scopus
Source ID: 80054089504

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

SkyMedia - UAV-based capturing of HD/3D content with WSN augmentation for immersive media experiences

In the entertainment industry, technology advances are continuously improving and evolving the portfolio of services and distinguished features that can be experienced by the audience, whether it is attending the event on site or remotely. In this context, the SkyMedia system aims at exploring, designing, and demonstrating a novel multimedia end-to-end architecture that can provide unique immersive media experiences to audience during live events. UAV and WSN technologies play a central role as enabling technologies. UAVs capture HD and 3D videos and images from the sky, while wireless sensors form an augmentation network acquiring side-information to be fused with the main audiovisual contents. All technologies come together to form a very advanced Multimedia Service Platform able to manage in real-time HD/3D processing, and an immersive media experience demonstration is going to be performed during a public live event in order to prove the effectiveness of the system.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA), Mavigex S.r.l., Nimbus S.r.l., TEKEVER S.A., SA Vitec, Thales Communications SA, Optilink Kft, Fogscreen Oy
Contributors: Neri, M., Campi, A., Suffritti, R., Grimaccia, F., Sinogas, P., Guye, O., Papin, C., Michalareas, T., Gazdag, L., Rakkolainen, I.
Publication date: 2011

Host publication information

Title of host publication: Electronic Proceedings of the 2011 IEEE International Conference on Multimedia and Expo, ICME 2011
Article number: 6012133
ISBN (Print): 9781612843490
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: 3D processing, immersive and interactive services, live events, multimedia delivery, UAV-based capturing, wireless sensor networks
Source: Scopus
Source ID: 80155171686

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Thickness variation study of RFID-based folded patch antennas for strain sensing

This paper explores folded patch antennas for the development of low-cost and wireless smart-skin sensors that monitor the strain in metallic structures. When the patch antenna is under strain/deformation, its resonance frequency varies accordingly. The variation can be easily interrogated and recorded by a wireless reader that also provides power for the antenna operation. The patch antenna adopts a specially selected substrate material with low dielectric constant, as well as an inexpensive off-the-shelf radiofrequency identification (RFID) chip for signal modulation. A thicker substrate increases RFID signal-to-noise ratio, but reduces the strain transfer efficiency. To experimentally study the effect of substrate thickness, two prototype folded patch antennas with different substrate thicknesses have been designed and manufactured. For both prototypes, tensile testing results show strong linearity between the interrogated resonance frequency and the strain experienced by the antenna. Longer interrogation range is achieved with the larger substrate thickness.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Georgia Institute of Technology, School of Electrical and Computer Engineering
Contributors: Yi, X., Wu, T., Lantz, G., Wang, Y., Leon, R. T., Tentzeris, M. M.
Publication date: 2011

Host publication information

Title of host publication: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Volume: 7981
Article number: 79811H
ISBN (Print): 9780819485434
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: folded patch antenna, passive wireless sensor, RFID, strain sensor, substrate thickness
Source: Scopus
Source ID: 79956325124

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Visually lossless compression of synthetic aperture radar images

A task of visually lossless but, in fact, lossy compression of synthetic aperture radar (SAR) images corrupted by intensive speckle is considered. A method based on discrete cosine transform (DCT) applied in 8×8 blocks is proposed. The method is adapted to spatial DCT spectrum of speckle and its multiplicative nature. It is shown that the proposed method allows providing compression ratio (CR) of about 3.2⋯3.5 for simulated and real life SAR images which is sufficiently larger than for image lossless comp ression tech niqu es.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Tampere University of Technology, Signal Processing Research Community (SPRC), National Aerospace University
Contributors: Ponomarenko, N. N., Lukin, V. V., Egiazarian, K. O.
Number of pages: 3
Pages: 263-265
Publication date: 2011

Host publication information

Title of host publication: 8th International Conference on Antenna Theory and Techniques, ICATT'11
Article number: 6170755
ISBN (Print): 978-1-4577-2211-0
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications, Electrical and Electronic Engineering
Source: Scopus
Source ID: 84860003383

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Fault tolerant machine learning for nanoscale cognitive radio

We introduce a machine learning-based classifier that identifies free radio channels for cognitive radio. The architecture is designed for nanoscale implementation, under nanoscale implementation constraints; we do not describe all physical details but believe future physical implementation to be feasible. The system uses analog computation and consists of cyclostationary feature extraction and a radial basis function network for classification. We describe a model for nanoscale faults in the system, and simulate experimental performance and fault tolerance in recognizing WLAN signals, under different levels of noise and computational errors. The system performs well under expected non-ideal manufacturing and operating conditions.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aalto University, Nokia
Contributors: Pajarinen, J., Peltonen, J., Uusitalo, M. A.
Number of pages: 12
Pages: 753-764
Publication date: Feb 2011
Peer-reviewed: Yes

Publication information

Journal: Neurocomputing
Volume: 74
Issue number: 5
ISSN (Print): 0925-2312
Ratings: 
  • Scopus rating (2011): CiteScore 2.6 SJR 0.898 SNIP 1.793
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Cognitive Neuroscience, Artificial Intelligence
Keywords: Cognitive radio, Fault tolerance, Nanoelectronics, Nanotechnology, Radial basis function network
Source: Scopus
Source ID: 78650719880

Research output: Contribution to journalArticleScientificpeer-review

Forward simulation and inverse dipole localization with the lowest order Raviart - Thomas elements for electroencephalography

Electroencephalography is a non-invasive imaging modality in which a primary current density generated by the neural activity in the brain is to be reconstructed based on external electric potential measurements. This paper focuses on the finite element method (FEM) from both forward and inverse aspects. The goal is to establish a clear correspondence between the lowest order Raviart-Thomas basis functions and dipole sources as well as to show that the adopted FEM approach is computationally effective. Each basis function is associated with a dipole moment and a location. Four candidate locations are tested. Numerical experiments cover two different spherical multilayer head models, four mesh resolutions and two different forward simulation approaches, one based on FEM and another based on the boundary element method (BEM) with standard dipoles as sources. The forward simulation accuracy is examined through column- and matrix-wise relative errors as well as through performance in inverse dipole localization. A closed-form approximation of dipole potential was used as the reference forward simulation. The present approach is compared to the BEM and indirectly also to the recent FEM-based subtraction approach regarding both accuracy, computation time and accessibility of implementation.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematical modelling with wide societal impact (MathImpact), Aalto University, Dipartimento di Matematica, Università di Genova, University of Warwick, University of Helsinki, CNR-SPIN
Contributors: Pursiainen, S., Sorrentino, A., Campi, C., Piana, M.
Publication date: Apr 2011
Peer-reviewed: Yes

Publication information

Journal: Inverse Problems
Volume: 27
Issue number: 4
Article number: 045003
ISSN (Print): 0266-5611
Ratings: 
  • Scopus rating (2011): CiteScore 1.9 SJR 1.208 SNIP 1.579
Original language: English
ASJC Scopus subject areas: Theoretical Computer Science, Signal Processing, Mathematical Physics, Computer Science Applications, Applied Mathematics
Source: Scopus
Source ID: 79953662770

Research output: Contribution to journalArticleScientificpeer-review

BACOM: In silico detection of genomic deletion types and correction of normal cell contamination in copy number data

Motivation: Identification of somatic DNA copy number alterations (CNAs) and significant consensus events (SCEs) in cancer genomes is a main task in discovering potential cancer-driving genes such as oncogenes and tumor suppressors. The recent development of SNP array technology has facilitated studies on copy number changes at a genome-wide scale with high resolution. However, existing copy number analysis methods are oblivious to normal cell contamination and cannot distinguish between contributions of cancerous and normal cells to the measured copy number signals. This contamination could significantly confound downstream analysis of CNAs and affect the power to detect SCEs in clinical samples. Results: We report here a statistically principled in silico approach, Bayesian Analysis of COpy number Mixtures (BACOM), to accurately estimate genomic deletion type and normal tissue contamination, and accordingly recover the true copy number profile in cancer cells. We tested the proposed method on two simulated datasets, two prostate cancer datasets and The Cancer Genome Atlas high-grade ovarian dataset, and obtained very promising results supported by the ground truth and biological plausibility. Moreover, based on a large number of comparative simulation studies, the proposed method gives significantly improved power to detect SCEs after in silico correction of normal tissue contamination. We develop a cross-platform open-source Java application that implements the whole pipeline of copy number analysis of heterogeneous cancer tissues including relevant processing steps. We also provide an R interface, bacomR, for running BACOM within the R environment, making it straightforward to include in existing data pipelines.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Prostate cancer research center (PCRC), Virginia Tech, Johns Hopkins School of Medicine, Wake Forest University School of Medicine
Contributors: Yu, G., Zhang, B., Bova, G. S., Xu, J., Shih, I. M., Wang, Y.
Number of pages: 8
Pages: 1473-1480
Publication date: Jun 2011
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 27
Issue number: 11
Article number: btr183
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2011): CiteScore 5.61 SJR 4.118 SNIP 1.83
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability, Medicine(all)
Source: Scopus
Source ID: 79957859881

Research output: Contribution to journalArticleScientificpeer-review

Multithreaded simulation for synchronous dataflow graphs

For system simulation, Synchronous DataFlow (SDF) has been widely used as a core model of computation in design tools for digital communication and signal processing systems. The traditional approach for simulating SDF graphs is to compute and execute static schedules in single-processor desktop environments. Nowadays, however, multicore processors are increasingly popular desktop platforms for their potential performance improvements through thread-level parallelism. Without novel scheduling and simulation techniques that explicitly explore thread-level parallelism for executing SDF graphs, current design tools gain only minimal performance improvements on multicore platforms. In this article, we present a new multithreaded simulation scheduler, called MSS, to provide simulation runtime speedup for executing SDF graphs on multicore processors. MSS strategically integrates graph clustering, intracluster scheduling, actor vectorization, and intercluster buffering techniques to construct InterThread Communication (ITC) graphs at compile-time. MSS then applies efficient synchronization and dynamic scheduling techniques at runtime for executing ITC graphs in multithreaded environments. We have implemented MSS in the Advanced Design System (ADS) from Agilent Technologies. On an Intel dual-core, hyper-threading (4 processing units) processor, our results from this implementation demonstrate up to 3.5 times speedup in simulating modern wireless communication systems (e.g., WCDMA3G, CDMA 2000, WiMax, EDGE, and Digital TV).

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Signal Processing Research Community (SPRC), Agilent Technologies, Department of Electrical and Computer Engineering, University of Maryland
Contributors: Hsu, C. J., Pino, J. L., Bhattacharyya, S. S.
Publication date: Jun 2011
Peer-reviewed: Yes

Publication information

Journal: ACM Transactions on Design Automation of Electronic Systems
Volume: 16
Issue number: 3
Article number: 25
ISSN (Print): 1084-4309
Ratings: 
  • Scopus rating (2011): CiteScore 1.39 SJR 0.493 SNIP 1.129
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Computer Graphics and Computer-Aided Design, Electrical and Electronic Engineering
Keywords: Multithreaded simulation, Scheduling, Synchronous dataflow
Source: Scopus
Source ID: 79960659084

Research output: Contribution to journalArticleScientificpeer-review

Biological principles for future Internet architecture design

Currently, a large number of activities on Internet redesign are being discussed in the research community. While today's Internet was initially planned as a datagram-oriented communication network among research facilities, it has grown and evolved to accommodate unexpected diversity in services and applications. For the future Internet this trend is anticipated to continue even more. Such developments demand that the architecture of the new-generation Internet be designed in a dynamic, modular, and adaptive way. Features like these can often be observed in biological processes that serve as inspiration for designing new cooperative architectural concepts. Our contribution in this article is twofold. First, unlike previous discussions on biologically inspired network control mechanisms, we do not limit ourselves to a single method, but consider ecosystems and coexisting environments of entities that can cooperate based on biological principles. Second, we illustrate our grand view by not only taking inspiration from biology in the design process, but also sketching a possible way to implement biologically driven control in a future Internet architecture.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Wireless Communications and Positioning (WICO), Waterford Institute of Technology, Osaka University, University of Cambridge
Contributors: Balasubramaniam, S., Leibnitz, K., Lio, P., Botvich, D., Murata, M.
Number of pages: 9
Pages: 44-52
Publication date: Jul 2011
Peer-reviewed: Yes

Publication information

Journal: IEEE Communications Magazine
Volume: 49
Issue number: 7
Article number: 5936154
ISSN (Print): 0163-6804
Ratings: 
  • Scopus rating (2011): CiteScore 4.97 SJR 1.976 SNIP 5.011
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Computer Networks and Communications, Electrical and Electronic Engineering
Source: Scopus
Source ID: 79960029644

Research output: Contribution to journalArticleScientificpeer-review

Social interaction in games

Due to the popularity of social media networks and the games played on those platforms interest in the so-called social games has piqued. This article looks at those games in the context of general social aspects of game play. By approaching game play as an activity, it is possible to distinguish between different kinds of social interaction: the sociability players engage in around the game and the social play contained and mediated by the game. In charting the social space of playing, this article shows the inherent social aspects of singleplayer games - and the solitary aspects of social games.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematical modelling with wide societal impact (MathImpact)
Contributors: Stenros, J., Paavilainen, J., Mäyrä, F.
Number of pages: 17
Pages: 342-358
Publication date: Jul 2011
Peer-reviewed: Yes

Publication information

Journal: International Journal of Arts and Technology
Volume: 4
Issue number: 3
ISSN (Print): 1754-8853
Ratings: 
  • Scopus rating (2011): CiteScore 0.48 SJR 0.137 SNIP 0.515
Original language: English
ASJC Scopus subject areas: Visual Arts and Performing Arts, Computer Science Applications
Keywords: Games, Gaming capital, Massive single player, Multiplayer, Performance, Play, Single player, Sociability, Social interaction, Social play
Source: Scopus
Source ID: 84858774885

Research output: Contribution to journalArticleScientificpeer-review

Distributed pervasive services using group service communication supporting body area networks

Body Area Network (BAN) provide critical data in healthcare monitoring environments, where such monitoring can be performed in a ubiquitous manner using various miniature device technologies. However, a key requirement in supporting the full capacity of a BAN is an efficient distribution, processing and application of the acquired data. The architecture and applications which capitalize on the huge potential of this data, provide significant added value to BANs. This paper proposes an architecture which is service oriented and integrates the data produced by BANs into a healthcare environment, supporting remote interactions between medical officers to maximise patient care. The dynamic interaction of distributed services in this diverse environment is a key ingredient in the way technology can enhance healthcare. The architecture defines group services which facilitate the control of the dynamic behaviour of services within this heterogeneous environment.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Wireless Communications and Positioning (WICO), Waterford Institute of Technology, Telecommunications Software and Systems Group (TSSG), Technical University of Dortmund, Brigham and Women's Hospital
Contributors: Foley, C., Balasubramaniam, S., Botvich, D., Donnelly, W., Michaelis, S., Schmutzler, J., Stair, T.
Publication date: 29 Nov 2011

Host publication information

Title of host publication: BODYNETS 2008 - 3rd International ICST Conference on Body Area Networks
Publisher: ICST
ISBN (Electronic): 9789639799172
ASJC Scopus subject areas: Computer Science Applications, Computer Networks and Communications, Artificial Intelligence
Keywords: Groups, Health-care, Monitoring, Policies, Services
Source: Scopus
Source ID: 84912141219

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Structural Measures for Network Biology Using QuACN

Background: Structural measures for networks have been extensively developed, but many of them have not yet demonstrated their sustainably. That means, it remains often unclear whether a particular measure is useful and feasible to solve a particular problem in network biology. Exemplarily, the classification of complex biological networks can be named, for which structural measures are used leading to a minimal classification error. Hence, there is a strong need to provide freely available software packages to calculate and demonstrate the appropriate usage of structural graph measures in network biology.Results: Here, we discuss topological network descriptors that are implemented in the R-package QuACN and demonstrate their behavior and characteristics by applying them to a set of example graphs. Moreover, we show a representative application to illustrate their capabilities for classifying biological networks. In particular, we infer gene regulatory networks from microarray data and classify them by methods provided by QuACN. Note that QuACN is the first freely available software written in R containing a large number of structural graph measures.Conclusion: The R package QuACN is under ongoing development and we add promising groups of topological network descriptors continuously. The package can be used to answer intriguing research questions in network biology, e.g., classifying biological data or identifying meaningful biological features, by analyzing the topology of biological networks.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Institute for Bioinformatics and Translational Research, Computational Biology and Machine Learning Lab., Faculty of Medicine, Health and Life Sciences, Queen's University, Belfast, Northern Ireland
Contributors: Mueller, L. A. J., Kugler, K. G., Graber, A., Emmert-Streib, F., Dehmer, M.
Publication date: 24 Dec 2011
Peer-reviewed: Yes

Publication information

Journal: BMC Bioinformatics
Volume: 12
Issue number: 1
Article number: 492
ISSN (Print): 1471-2105
Ratings: 
  • Scopus rating (2011): CiteScore 3.34 SJR 1.662 SNIP 1.196
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computer Science Applications, Applied Mathematics, Structural Biology
Source: Scopus
Source ID: 84155173344

Research output: Contribution to journalArticleScientificpeer-review

A system for real-time detection and tracking of vehicles from a single car-mounted camera

A novel system for detection and tracking of vehicles from a single car-mounted camera is presented. The core of the system are high-performance vision algorithms: the WaldBoost detector [1] and the TLD tracker [2] that are scheduled so that a real-time performance is achieved. The vehicle monitoring system is evaluated on a new dataset collected on Italian motorways which is provided with approximate ground truth (GT0) obtained from laser scans. For a wide range of distances, the recall and precision of detection for cars are excellent. Statistics for trucks are also reported. The dataset with the ground truth is made public.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research Community on Data-to-Decision (D2D), Advanced Technology Division, Czech Technical University in Prague
Contributors: Caraffi, C., Vojir, T., Trefný, J., Šochman, J., Matas, J.
Number of pages: 8
Pages: 975-982
Publication date: 2012

Host publication information

Title of host publication: 2012 15th International IEEE Conference on Intelligent Transportation Systems, ITSC 2012
Article number: 6338748
ISBN (Print): 9781467330640
ASJC Scopus subject areas: Automotive Engineering, Mechanical Engineering, Computer Science Applications
Source: Scopus
Source ID: 84871239330

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Design and synthesis for multimedia systems using the targeted dataflow interchange format

Development of multimedia systems that can be targeted to different platforms is challenging due to the need for rigorous integration between high-level abstract modeling, and low-level synthesis and optimization. In this paper, a new dataflow-based design tool called the targeted dataflow interchange format is introduced for retargetable design, analysis, and implementation of embedded software for multimedia systems. Our approach provides novel capabilities, based on principles of task-level dataflow analysis, for exploring and optimizing interactions across design components; object-oriented data structures for encapsulating contextual information for components; a novel model for representing parameterized schedules that are derived from repetitive graph structures; and automated code generation for programming interfaces and low-level customizations that are geared toward high-performance embedded-processing architectures. We demonstrate our design tool for cross-platform application design, parameterized schedule representation, and associated dataflow graph-code generation using a case study centered around an image registration application.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Signal Processing Research Community (SPRC), University of Maryland, SAIC, New Jersey Institute of Technology, Department of Electrical and Computer Engineering
Contributors: Shen, C. C., Wu, S., Sane, N., Wu, H. H., Plishker, W., Bhattacharyya, S. S.
Number of pages: 11
Pages: 630-640
Publication date: 2012
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Multimedia
Volume: 14
Issue number: 3 PART1
Article number: 6172244
ISSN (Print): 1520-9210
Ratings: 
  • Scopus rating (2012): CiteScore 3.75 SJR 0.815 SNIP 2.573
Original language: English
ASJC Scopus subject areas: Signal Processing, Media Technology, Computer Science Applications, Electrical and Electronic Engineering
Keywords: Dataflow graphs, design tools, embedded signal processing, scheduling, software synthesis
Source: Scopus
Source ID: 84861152678

Research output: Contribution to journalArticleScientificpeer-review

Evaluation of effectiveness of the stickgrip device for detecting the topographic heights on digital maps

Multimodal visualization of landscapes and cityscapes requires new concepts and metaphors for intuitive operations with multidimensional data in fully immersive virtual environments. Variations in lighting conditions and perceptual interpretation of the reduced topographic colors can significantly modify an assessment of the true elevation profiles on a digital map. This paper describes the results of the empirical evaluation of the new interaction technique that has potential to enhance the imaging functionality of the two-dimensional maps. It was demonstrated that untrained subjects become much more accurate at detecting the altitudes in a range of 0-4000 m assigned within the palette when values of the light intensity had been associated with the haptic information. The results confirmed that the accuracy of the height estimation with the StickGrip haptic device appeared to be higher by about 32% in comparison to visual assessment.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Augmented Human Activities (AHA)
Contributors: Evreinova, T. V., Evreinov, G., Raisamo, R.
Number of pages: 16
Pages: 61-76
Publication date: 2012
Peer-reviewed: Yes

Publication information

Journal: INTERNATIONAL JOURNAL OF COMPUTER SCIENCE AND APPLICATIONS
Volume: 9
Issue number: 3
ISSN (Print): 0972-9038
Ratings: 
  • Scopus rating (2012): CiteScore 0.66 SJR 0.235 SNIP 0.719
Original language: English
ASJC Scopus subject areas: Computer Science Applications
Keywords: Geoscientific data, The stickgrip haptic device, Topographic elevation profile
Source: Scopus
Source ID: 84872773600

Research output: Contribution to journalArticleScientificpeer-review

Face typing: Vision-based perceptual interface for hands-free text entry with a scrollable virtual keyboard

We present a novel vision-based perceptual user interface for hands-free text entry that utilizes face detection and visual gesture detection to manipulate a scrollable virtual keyboard. A thorough experimentation was undertaken to quantitatively define a performance of the interface in hands-free pointing, selection and scrolling tasks. The experiments were conducted with nine participants in laboratory conditions. Several face and head gestures were examined for detection robustness and user convenience. The system gave a reasonable performance in terms of high gesture detection rate and small false alarm rate. The participants reported that a new interface was easy to understand and operate. Encouraged by these results, we discuss advantages and constraints of the interface and suggest possibilities for design improvements.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA)
Contributors: Gizatdinova, Y., Spakov, Ǒ., Surakka, V.
Number of pages: 7
Pages: 81-87
Publication date: 2012

Host publication information

Title of host publication: 2012 IEEE Workshop on the Applications of Computer Vision, WACV 2012
Article number: 6162997
ISBN (Print): 9781467302333
ASJC Scopus subject areas: Computer Vision and Pattern Recognition, Computer Science Applications
Source: Scopus
Source ID: 84860699077

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

High-content screening data management for drug discovery in a small- to medium- size laboratory: Results of a collaborative pilot study focused on user expectations as indicators of effectiveness

High-content screening (HCS) technology provides a powerful vantage point to approach biological problems; it allows analysis of cell parameters, including changes in cell or protein movement, shape, or texture. As part of a collaborative pilot research project to improve bioscience research data integration, we identified HCS data management as an area ripe for advancement. A primary goal was to develop an integrated data management and analysis system suitable for small- to medium-size HCS programs that would improve research productivity and increase work satisfaction. A system was developed that uses Labmatrix, a Webbased research data management platform, to integrate and query data derived from a Cellomics STORE database. Focusing on user expectations, several barriers to HCS productivity were identified and reduced or eliminated. The impact of the project on HCS research productivity was tested through a series of 18 lab-requested integrated data queries, 7 of which were fully enabled, 7 partially enabled, and 4 enabled through data export to standalone data analysis tools. The results are limited to one laboratory, but this pilot suggests that through an "implementation research" approach, a network of small- to medium-size laboratories involved in HCS projects could achieve greater productivity and satisfaction in drug discovery research.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Prostate cancer research center (PCRC), Wilmer Eye Institute, Fraunhofer Center for Experimental Software Engineering, BioFortis, Inc., University of Texas Health Science Center at Houston, Universite' Pierre et Marie Curie, Sorbonne, France, 13.12.2011, Johns Hopkins School of Medicine
Contributors: Berlinicke, C. A., Ackermann, C. F., Chen, S. H., Schulze, C., Shafranovich, Y., Myneni, S., Patel, V. L., Wang, J., Zack, D. J., Lindvall, M., Bova, G. S.
Number of pages: 11
Pages: 255-265
Publication date: 2012
Peer-reviewed: Yes

Publication information

Journal: JALA: JOURNAL OF LABORATORY AUTOMATION
Volume: 17
Issue number: 4
ISSN (Print): 2211-0682
Ratings: 
  • Scopus rating (2012): CiteScore 0.93 SJR 0.485 SNIP 0.633
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Medical Laboratory Technology
Keywords: Bioscience laboratory data management research, Drug discovery, High-content screening, Implementation research, Vision research
Source: Scopus
Source ID: 84868231968

Research output: Contribution to journalArticleScientificpeer-review

Multiobjective TDMA optimization for neuron-based molecular communication

This paper proposes and evaluates Neuronal TDMA, a TDMA-based signaling protocol framework for molecular communication, which utilizes neurons as a primary component to build in-body sensor-actuator networks (IBSANs). Neuronal TDMA leverages an evolutionary multiobjective optimization algorithm (EMOA) that optimizes the signaling schedule for nanomachines in IBSANs. The proposed EMOA uses a population of solution candidates, each of which represents a particular signaling schedule, and evolves them via several operators such as selection, crossover, mutation and offspring size adjustment. The evolution process is performed to seek Pareto-optimal signaling schedules subject to given constraints. Simulation results verify that the proposed EMOA efficiently obtains quality solutions. It outperforms several conventional EMOAs.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Wireless Communications and Positioning (WICO), University of Massachusetts Boston, Telecommunications Software and Systems Group (TSSG), Waterford Institute of Technology, Trinity College Dublin
Contributors: Suzuki, J., Balasubramaniam, S., Prina-Mello, A.
Publication date: 2012

Host publication information

Title of host publication: BODYNETS 2012 - 7th International Conference on Body Area Networks
Publisher: ICST
ISBN (Electronic): 9781936968602
ASJC Scopus subject areas: Computer Science Applications, Artificial Intelligence, Computer Networks and Communications
Keywords: Evolutionary multiobjective optimization algorithms, Molecular communication, Neuronal networks, TDMA scheduling
Source: Scopus
Source ID: 84908577240

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

On the definition of dynamic software measures

The quantification of several software attributes (e.g., size, complexity, cohesion, coupling) is usually carried out in a static fashion, and several hundreds of measures have been defined to this end. However, static measurement may only be an approximation for the measurement of these attributes during software use. The paper proposes a theoretical framework based on Axiomatic Approaches for the definition of sensible dynamic software measures that can dynamically capture these attributes. Dynamic measures based on this framework are defined for dynamically quantifying size and coupling. In this paper, we also compare dynamic measures of size and coupling against well-known static measures by correlating them with fault-pronenesses of four case studies.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Università degli Studi Dell'Insubria, Former organisation of the author
Contributors: Lavazza, L., Morasca, S., Taibi, D., Tosi, D.
Number of pages: 10
Pages: 39-48
Publication date: 2012
Peer-reviewed: Yes

Publication information

Journal: International Symposium on Empirical Software Engineering and Measurement
ISSN (Print): 1949-3770
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Software
Keywords: Code coverage, Dynamic coupling, Dynamic measures, Dynamic size
Source: Scopus
Source ID: 84867570388

Research output: Contribution to journalArticleScientificpeer-review

Systematic integration of flowgraph- and module-level parallelism in implementation of DSP applications on multiprocessor systems-on-chip

Increasing use of multiprocessor system-on-chip (MPSoC) technology is an important trend in the design and implementation of signal processing systems. However, the design of efficient DSP software for MPSoC platforms involves complex inter-related steps, including data decomposition, memory management, and inter-task and inter-thread synchronization. These design steps are challenging, especially under strict constraints on performance and power consumption, and tight time to market pressures. To facilitate these steps, we have developed a new dataflow based design flow within the targeted dataflow interchange format (TDIF) design tool. Our new MPSoC-oriented design flow, called TDIF-PPG, is geared towards analysis and mapping of embedded DSP applications on MPSoCs. An important feature of TDIF-PPG is its capability to integrate graph level parallelism for DSP system flowgraphs and actor level parallelism for DSP functional modules into the application mapping processing. Here, graph level parallelism is exposed by the dataflow graph application representation in TDIF, and actor level parallelism is modeled by a novel model for multiprocessor dataflow graph implementation that we call the parallel processing group (PPG) model. We demonstrate our approach through actor and subsystem design for software defined radio.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Signal Processing Research Community (SPRC), University of Maryland, Department of Electrical and Computer Engineering
Contributors: Zhou, Z., Shen, C. C., Plishker, W., Wu, H. H., Bhattacharyya, S. S.
Number of pages: 7
Pages: 402-408
Publication date: 2012

Host publication information

Title of host publication: ICSP 2012 - 2012 11th International Conference on Signal Processing, Proceedings
Volume: 1
Article number: 6491686
ISBN (Print): 9781467321945
ASJC Scopus subject areas: Software, Signal Processing, Computer Science Applications
Source: Scopus
Source ID: 84876463174

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Thermal effects on a passive wireless antenna sensor for strain and crack sensing

For application in structural health monitoring, a folded patch antenna has been previously designed as a wireless sensor that monitors strain and crack in metallic structures. Resonance frequency of the RFID patch antenna is closely related with its dimension. To measure stress concentration in a base structure, the sensor is bonded to the structure like a traditional strain gage. When the antenna sensor is under strain/deformation together with the base structure, the antenna resonance frequency varies accordingly. The strain-related resonance frequency variation is wirelessly interrogated and recorded by a reader, and can be used to derive strain/deformation. Material properties of the antenna components can have significant effects on sensor performance. This paper investigates thermal effects through both numerical simulation and temperature chamber testing. When temperature fluctuates, previous sensor design (with a glass microfiber-reinforced PTFE substrate) shows relatively large variation in resonance frequency. To improve sensor performance, a new ceramic-filled PTFE substrate material is chosen for re-designing the antenna sensor. Temperature chamber experiments are also conducted to the sensor with new substrate material, and compared with previous design.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Georgia Institute of Technology, School of Electrical and Computer Engineering, Virginia Tech
Contributors: Yi, X., Vyas, R., Cho, C., Fang, C. H., Cooper, J., Wang, Y., Leon, R. T., Tentzeris, M. M.
Publication date: 2012

Host publication information

Title of host publication: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Volume: 8345
Article number: 83450F
ISBN (Print): 9780819490025
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Crack sensor, Folded patch antenna, Passive wireless sensor, RFID, Strain sensor, Thermal effect
Source: Scopus
Source ID: 84861112128

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Wear and corrosion behaviour of HVOF coatings engineered from conventional WC-Co-Cr and conventional WC-Co-Cr added nanostructured Wc-Co powders

Tungsten carbide base coatings deposited by High Velocity Oxy-Fuel (HVOF) technique are the most common materials deposited in order to protect the components surface against wear and corrosion. The purpose of this study is to investigate the sliding and abrasion wear and also the corrosion behaviour of HVOF coatings engineered from conventional WC-10Co-4Cr and conventional WC-10Co-4Cr with addition of WC-15Co nanostructured powders. A 5% addition of nanostructured WC-15Co powder was added to a conventional WC-10Co4Cr powder in order to improve the properties of the coating. The coatings have been characterized by SEM equipped with EDAX analyzer, XRD as well as the microhardness testing were performed. The wear behavior was evaluated by means of rubber wheel abrasion and ball-on-disk tests. The worn surfaces have been investigated by FESEM microscope and optical profilometer. The corrosion behavior of the coatings were tested with electrochemical open-cell potential measurements. The results showed that the nanostructured powder had a positive influence on sliding wear and corrosion behavior of the coating in comparison with the conventional coating.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Materials Science, Department of Materials Science, Engineering materials science and solutions (EMASS), Politehnica University of Timişoara
Contributors: Hulka, I., Şerban, V. A., Uţu, D., Koivuluoto, H., Vuoristo, P., Niemi, K.
Number of pages: 6
Pages: 322-327
Publication date: 2012

Host publication information

Title of host publication: NANOCON 2012 - Conference Proceedings, 4th International Conference
Publisher: TANGER Ltd.
ISBN (Electronic): 9788087294352
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Materials Science(all)
Keywords: HVOF, Nanostructures, WC based coatings, Wear
Source: Scopus
Source ID: 84923673812

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Wireless communications at the nanoscale

The importance of wireless communications is increasing thanks to the numerous types of services supported by wireless devices, which allow the realization of the always best connected vision. However, the dramatic boost toward miniaturization and nanoscale technologies requires rethinking of wireless communications on such a scale. While the transformation from wired to wireless communication has improved connectivity for end users and spawned new research areas, the field as a whole is approaching a crossroad. The main reason for this is the emergence of miniature devices, in particular devices that are built from nano components, which has led to new challenges for the wireless communication paradigm. Calcium signaling is a natural intercellular calcium wave found in biology cells that enables communication at short range between cells. Using this form of signaling can enable short-range communication that exploits a combination of biological constructs and engineered cells.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Wireless Communications and Positioning (WICO), Università degli Studi di Catania, Next-Generation Wireless Communications Laboratory (NWCL), Bio-Inspired Network Research Unit, TSSG, starMobile, Inc.
Contributors: Galluccio, L., Akan, O. B., Balasubramaniam, S., Sivakumar, R.
Number of pages: 2
Pages: 10-11
Publication date: 2012
Peer-reviewed: Yes

Publication information

Journal: IEEE Wireless Communications
Volume: 19
Issue number: 5
Article number: 6339466
ISSN (Print): 1536-1284
Ratings: 
  • Scopus rating (2012): CiteScore 4.99 SJR 1.718 SNIP 3.884
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications
Source: Scopus
Source ID: 84879211532

Research output: Contribution to journalArticleScientificpeer-review

Wireless sensing and identification of passive electromagnetic sensors based on millimetre-wave FMCW RADAR

The wireless measurement of various physical quantities from the analysis of the RADAR Cross Sections variability of passive electromagnetic sensors is presented. A millimetre-wave Frequency-Modulated Continuous-Wave RADAR is used for both remote sensing and wireless identification of sensors. Long reading ranges (up to some decameters) may be reached at the expense of poor measurement resolution (typically 10%).

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), University of Toulouse, INP, LAAS-CNRS, IPDIA, Georgia Institute of Technology, CNRS UMR 5218, IPB
Contributors: Aubert, H., Chebila, F., Jatlaoui, M., Thai, T., Hallil, H., Traille, A., Bouaziz, S., Rifai, A., Pons, P., Menini, P., Tentzeris, M.
Number of pages: 6
Pages: 398-403
Publication date: 2012

Host publication information

Title of host publication: 2012 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2012
Article number: 6404554
ISBN (Print): 9781467346566
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Source: Scopus
Source ID: 84873122062

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Body area nanonetworks with molecular communications in nanomedicine

Recent developments in nano and biotechnology enable promising therapeutic nanomachines (NMs) that operate on inter- or intracellular area of human body. The networks of such therapeutic NMs, body area nanonetworks (BAN 2s), also empower sophisticated nanomedicine applications. In these applications, therapeutic NMs share information to perform computation and logic operations, and make decisions to treat complex diseases. Hence, one of the most challenging subjects for these sophisticated applications is the realization of BAN 2 through a nanoscale communication paradigm. In this article, we introduce the concept of a BAN 2 with molecular communication, where messenger molecules are used as communication carrier from a sender to a receiver NM. The current state of the art of molecular communication and BAN 2 in nanomedicine applications is first presented. Then communication theoretical efforts are reviewed, and open research issues are given. The objective of this work is to introduce this novel and interdisciplinary research field and highlight major barriers toward its realization from the viewpoint of communication theory.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Wireless Communications and Positioning (WICO), Next-Generation Wireless Communications Laboratory (NWCL), Waterford Institute of Technology
Contributors: Atakan, B., Akan, O. B., Balasubramaniam, S.
Number of pages: 7
Pages: 28-34
Publication date: Jan 2012
Peer-reviewed: Yes

Publication information

Journal: IEEE Communications Magazine
Volume: 50
Issue number: 1
Article number: 6122529
ISSN (Print): 0163-6804
Ratings: 
  • Scopus rating (2012): CiteScore 5.73 SJR 2.524 SNIP 5.384
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Computer Networks and Communications
Source: Scopus
Source ID: 84855682134

Research output: Contribution to journalArticleScientificpeer-review

Short-term power load forecasting using grey correlation contest modeling

Power load has the characteristic of nonlinear fluctuation and random growth. Aiming at the drawback that the forecasting accuracy of general GM(1,1) model goes down when there is a greater load mutation, this paper proposes a new grey model with grey correlation contest for short-term power load forecasting. In order to cover the impact of various certain and uncertain factors in climate and society on the model as fully as possible, original series are selected from different viewpoints to construct different forecasting strategies. By making full use of the characteristic that GM(1,1) model can give a perfect forecasting result in the smooth rise and drop phase of power load, and the feature that there are several peaks and valleys within daily power load, the predicted day is divided into several smooth segments for separate forecasting. Finally, the different forecasting strategies are implemented respectively in the different segments through grey correlation contest, so as to avoid the error amplification resulted from the improper choice of initial condition. A practical application verifies that, compared with the existing grey forecasting models, the proposed model is a stable and feasible forecasting model with a higher forecasting accuracy.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Sensing Systems for Wireless Medicine (MediSense), Hunan University, Sany Smart Control Equipment Ltd., Georgia Institute of Technology
Contributors: Jin, M., Zhou, X., Zhang, Z. M., Tentzeris, M. M.
Number of pages: 7
Pages: 773-779
Publication date: Jan 2012
Peer-reviewed: Yes

Publication information

Journal: Expert Systems with Applications
Volume: 39
Issue number: 1
ISSN (Print): 0957-4174
Ratings: 
  • Scopus rating (2012): CiteScore 3.38 SJR 1.148 SNIP 2.407
Original language: English
ASJC Scopus subject areas: Engineering(all), Computer Science Applications, Artificial Intelligence
Keywords: External optimization, Grey correlation contest, Hybrid grey model, Internal optimization, Short-term power load forecasting, Time-segment
Source: Scopus
Source ID: 81855218656

Research output: Contribution to journalArticleScientificpeer-review

Organizational structure and the periphery of the gene regulatory network in B-cell lymphoma.

The physical periphery of a biological cell is mainly described by signaling pathways which are triggered by transmembrane proteins and receptors that are sentinels to control the whole gene regulatory network of a cell. However, our current knowledge about the gene regulatory mechanisms that are governed by extracellular signals is severely limited. The purpose of this paper is three fold. First, we infer a gene regulatory network from a large-scale B-cell lymphoma expression data set using the C3NET algorithm. Second, we provide a functional and structural analysis of the largest connected component of this network, revealing that this network component corresponds to the peripheral region of a cell. Third, we analyze the hierarchical organization of network components of the whole inferred B-cell gene regulatory network by introducing a new approach which exploits the variability within the data as well as the inferential characteristics of C3NET. As a result, we find a functional bisection of the network corresponding to different cellular components. Overall, our study allows to highlight the peripheral gene regulatory network of B-cells and shows that it is centered around hub transmembrane proteins located at the physical periphery of the cell. In addition, we identify a variety of novel pathological transmembrane proteins such as ion channel complexes and signaling receptors in B-cell lymphoma.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Prostate cancer research center (PCRC), Queen's University, Belfast, Northern Ireland, Computational Biology and Machine Learning Lab., Faculty of Medicine, Health and Life Sciences
Contributors: de Matos Simoes, R., Tripathi, S., Emmert-Streib, F.
Publication date: 14 May 2012
Peer-reviewed: Yes

Publication information

Journal: BMC Systems Biology
Volume: 6
Article number: 38
ISSN (Print): 1752-0509
Ratings: 
  • Scopus rating (2012): CiteScore 3.32 SJR 1.577 SNIP 1.009
Original language: English
ASJC Scopus subject areas: Molecular Biology, Structural Biology, Applied Mathematics, Modelling and Simulation, Computer Science Applications
Keywords: B-cell lymphoma, Gene expression data, Gene regulatory network, Statistical network inference
Source: Scopus
Source ID: 84865119369

Research output: Contribution to journalArticleScientificpeer-review

Elemental and mixed actinide dioxides: An ab initio study

We present a systematic study of the electronic, geometric, and magnetic properties of the actinide dioxides, UO 2, PuO 2, AmO 2, U 0.5Pu 0.5O 2, U 0.5Am 0.5O 2 and Pu 0.5Am 0.5O 2. For UO 2, PuO 2 and AmO 2, both density functional and hybrid density functional theory (DFT and HDFT) have been used. The fractions of exact HartreeFock (HF) exchange chosen were 25% and 40% for the hybrid density functional. For U 0.5Pu 0.5O 2, U 0.5Am 0.5O 2 and Pu 0.5Am 0.5O 2, only HDFT with 40% exact HF exchange was used. Each compound has been studied at the nonmagnetic, ferromagnetic and anti-ferromagnetic configurations, with and without spinorbit coupling (SOC). The lattice parameters, magnetic structures, bulk moduli, band gaps and density of states have been computed and compared to available experimental data and other theoretical results. Pure DFT fails to provide a satisfactory qualitative description of the electronic and magnetic structures of the actinide dioxides. On the other hand, HDFT performs very well in the prediction and description of the properties of the actinide dioxides. Our total energy calculations clearly indicate that the ground-state structures are anti-ferromagnetic for all actinide dioxides considered here. The lattice constants and the band gaps expand with an increase of HF exchange in HDFT. The influence of SOC is found to be significant.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Computational Science X (CompX), University of Texas at Arlington, Pacific Northwest National Laboratory
Contributors: Ma, L., Atta-Fynn, R., Ray, A. K.
Number of pages: 19
Pages: 611-629
Publication date: Jun 2012
Peer-reviewed: Yes

Publication information

Journal: Journal of Theoretical and Computational Chemistry
Volume: 11
Issue number: 3
ISSN (Print): 0219-6336
Ratings: 
  • Scopus rating (2012): CiteScore 0.69 SJR 0.315 SNIP 0.304
Original language: English
ASJC Scopus subject areas: Physical and Theoretical Chemistry, Computational Theory and Mathematics, Computer Science Applications
Keywords: Actinide dioxides, hybrid density functional theory, mixed actinide oxides
Source: Scopus
Source ID: 84862874223

Research output: Contribution to journalArticleScientificpeer-review

Rethinking Playing Research: DJ HERO and Methodological Observations in the Mix

Playing games has a crucial methodological role within the study of games. At the same time, detailed overviews of how academic playing is conducted are difficult to find. In this article, the authors begin with Espen Aarseth's outline of playing research and offer some updates to it in order to build a more context-aware approach. To exemplify the elaborated methodology, the authors apply it to the rhythm game DJ HERO. They emphasize in this article that a game not only creates a world of its own, but also is in many ways connected to the traditions directed by real-world culture and economics. Thus, playing research needs to go beyond the limits of gameworld and normative gameplay, and move toward a concept or assemblage of play that takes into account games as singular and multifaceted technocultural entities.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematical modelling with wide societal impact (MathImpact), Turun Yliopisto/Turun Biomateriaalikeskus
Contributors: Karppi, T., Sotamaa, O.
Number of pages: 17
Pages: 413-429
Publication date: Jun 2012
Peer-reviewed: Yes

Publication information

Journal: SIMULATION AND GAMING
Volume: 43
Issue number: 3
ISSN (Print): 1046-8781
Ratings: 
  • Scopus rating (2012): CiteScore 1.73 SJR 1.037 SNIP 2.174
Original language: English
ASJC Scopus subject areas: Business, Management and Accounting (miscellaneous), Computer Science Applications
Keywords: assemblage, cheating, controller, DJ HERO, gameplay, methodology, modification, playing games, playing research, real world, remix culture, research methods, rhythm games
Source: Scopus
Source ID: 84862604514

Research output: Contribution to journalArticleScientificpeer-review

Studying the Elusive Experience in Pervasive Games

Studying pervasive games is inherently difficult and different from studying computer or board games. This article builds upon the experiences of staging and studying several playful pervasive technology prototypes. It discusses the challenges and pitfalls of evaluating pervasive game prototypes and charts methods that have proven useful in previous research. The aim is to open discussion on the situated methodology of qualitative study of evaluating and researching pervasive play.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematical modelling with wide societal impact (MathImpact), Stockholm University
Contributors: Stenros, J., Waern, A., Montola, M.
Number of pages: 17
Pages: 339-355
Publication date: Jun 2012
Peer-reviewed: Yes

Publication information

Journal: SIMULATION AND GAMING
Volume: 43
Issue number: 3
ISSN (Print): 1046-8781
Ratings: 
  • Scopus rating (2012): CiteScore 1.73 SJR 1.037 SNIP 2.174
Original language: English
ASJC Scopus subject areas: Business, Management and Accounting (miscellaneous), Computer Science Applications
Keywords: ambiguity, design, design-play relationship, elusiveness, evaluation methods, experience, game genres, game studies, pervasive games, pervasive play, play experience, qualitative study, research methodology, situated methodology
Source: Scopus
Source ID: 84862597533

Research output: Contribution to journalArticleScientificpeer-review

Elastic image registration for guiding focal laser ablation of prostate cancer: Preliminary results

Purpose: To guide ultrasound-driven prostate photodynamic therapy using information from MRI-based treatment planning. Methods: Robust points matching (RPM) and thin plate splines (TPS) are used to solve correspondences and to map optimally positioned landmarks from MR images to transrectal ultrasound (TRUS) images. The algorithm uses a reduced number of anatomical markers that are initialized on the images. Results: Both phantom and patient data were used to evaluate precision and robustness of the method. Mean registration error (±standard deviation) was of 2.18. ±. 0.25. mm and 1.55. ±. 0.31. mm for patient prostate and urethra, respectively. Repeated tests with different markers initialization conditions showed that the quality of registration was neither influenced by the number of markers nor to the human observer. Conclusion: This method allows for satisfyingly accurate and robust non rigid registration of MRI and TRUS and provides practitioners with substantial help in mapping treatment planning from pre-operative MRI to interventional TRUS.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Frontier Photonics, Univ Paris 06, Centre National de la Recherche Scientifique (CNRS), Pierre & Marie Curie University - Paris 6, Institut de Recherche pour le Developpement (IRD), Inria, Institut National de la Sante et de la Recherche Medicale (Inserm), Univ Sorbonne, CNRS,ICM,UMR S 1127,UMR 7225,U1127, INSERM,Inria Paris Rocquencourt,Inst Cerveau & Mo, Lille University Hospital - CHRU, CHU Angers, Univ Lille Nord de France
Contributors: Makni, N., Puech, P., Colin, P., Azzouzi, A., Mordon, S., Betrouni, N.
Number of pages: 11
Pages: 213-223
Publication date: Oct 2012
Peer-reviewed: Yes

Publication information

Journal: Computer Methods and Programs in Biomedicine
Volume: 108
Issue number: 1
ISSN (Print): 0169-2607
Ratings: 
  • Scopus rating (2012): CiteScore 2.08 SJR 0.489 SNIP 1.525
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Software, Health Informatics
Keywords: Image-guided interventions, Magnetic resonance imaging, Non rigid registration, PDT, Prostate cancer, Transrectal ultrasound imaging
Source: Scopus
Source ID: 84865711653

Research output: Contribution to journalArticleScientificpeer-review

Implementation of a direct procedure for critical point computations using preconditioned iterative solvers

Computation of critical points on an equilibrium path requires the solution of a non-linear eigenvalue problem. These critical points could be either bifurcation or limit points. When the external load is parametrized by a single parameter, the non-linear stability eigenvalue problem consists of solving the equilibrium equations along the criticality condition. Several techniques exist for solution of such a system. Their algorithmic treatment is usually focused for direct linear solvers and thus use the block elimination strategy. In this paper special emphasis is given for a strategy which can be used also with iterative linear solvers. Comparison to the block elimination strategy with direct linear solvers is given. Due to the non-uniqueness of the critical eigenmode a normalizing condition is required. In addition, for bifurcation points, the Jacobian matrix of the augmented system is singular at the critical point and additional stabilization is required in order to maintain the quadratic convergence of the Newton's method. Depending on the normalizing condition, convergence to a critical point with negative load parameter value can happen. The form of the normalizing equation is critically discussed. Due to the slenderness of the buckling sensitive structures the resulting matrices are ill-conditioned and a good preconditioner is mandatory for efficient solution. © 2012 Civil-Comp Ltd. and Elsevier Ltd. All rights reserved.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Mechanics and Design, Department of Civil Engineering, Life Cycle Effectiveness of the Built Environment (LCE@BE), Academy of Sciences of the Czech Republic, Institute of Computer Science of the Academy of Sciences of the Czech Republic, Department of Civil and Structural Engineering, Aalto University
Contributors: Kouhia, R., Tůma, M., Mäkinen, J., Fedoroff, A., Marjamäki, H.
Number of pages: 8
Pages: 110-117
Publication date: Oct 2012
Peer-reviewed: Yes

Publication information

Journal: Computers & Structures
Volume: 108-109
ISSN (Print): 0045-7949
Ratings: 
  • Scopus rating (2012): CiteScore 2.19 SJR 1.354 SNIP 2.195
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Civil and Structural Engineering, Mechanical Engineering, Modelling and Simulation, Materials Science(all)
Keywords: Critical points, Equilibrium equations, Non-linear eigenvalue problem, Preconditioned iterations

Bibliographical note

/kir12<br/>Contribution: organisation=mec,FACT1=1<br/>Publisher name: Elsevier

Source: researchoutputwizard
Source ID: 4554

Research output: Contribution to journalArticleScientificpeer-review

Gene set analysis for self-contained tests: Complex null and specific alternative hypotheses

Motivation: The analysis of differentially expressed gene sets became a routine in the analyses of gene expression data. There is a multitude of tests available, ranging from aggregation tests that summarize gene-level statistics for a gene set to true multivariate tests, accounting for intergene correlations. Most of them detect complex departures from the null hypothesis but when the null hypothesis is rejected the specific alternative leading to the rejection is not easily identifiable. Results: In this article we compare the power and Type I error rates of minimum-spanning tree (MST)-based non-parametric multivariate tests with several multivariate and aggregation tests, which are frequently used for pathway analyses. In our simulation study, we demonstrate that MST-based tests have power that is for many settings comparable with the power of conventional approaches, but outperform them in specific regions of the parameter space corresponding to biologically relevant configurations. Further, we find for simulated and for gene expression data that MST-based tests discriminate well against shift and scale alternatives. As a general result, we suggest a two-step practical analysis strategy that may increase the interpretability of experimental data: first, apply the most powerful multivariate test to find the subset of pathways for which the null hypothesis is rejected and second, apply MST-based tests to these pathways to select those that support specific alternative hypotheses.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Prostate cancer research center (PCRC), University of Arkansas for Medical Sciences, Computational Biology and Machine Learning, Queen's University, Belfast, Northern Ireland
Contributors: Rahmatallah, Y., Emmert-Streib, F., Glazko, G.
Number of pages: 8
Pages: 3073-3080
Publication date: Dec 2012
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 28
Issue number: 23
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2012): CiteScore 6.73 SJR 5.275 SNIP 2.051
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability, Medicine(all)
Source: Scopus
Source ID: 84870441671

Research output: Contribution to journalArticleScientificpeer-review

A novel framework for design and implementation of adaptive stream mining systems

With the increasing need for accurate mining and classification from multimedia data content, and the growth of such multimedia applications in mobile and distributed architectures, stream mining systems require increasing amounts of flexibility, extensibility, and adaptivity for effective deployment. To address this challenge, we propose a novel approach that rigorously integrates foundations of dataflow modeling for high level signal processing system design, and adaptive stream mining based on dynamic topologies of classifiers. In particular, we introduce a new design environment, called the lightweight dataflow for dynamic data driven application systems (LiD4E) environment. LiD4E provides formal semantics, rooted in dataflow principles, for design and implementation of a broad class of multimedia stream mining topologies. We demonstrate the capabilities of LiD4E using a face detection application that systematically adapts the type of classifier used based on dynamically changing application constraints.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Signal Processing Research Community (SPRC), University of Maryland
Contributors: Sudusinghe, K., Won, S., Van Der Schaar, M., Bhattacharyya, S.
Publication date: 2013

Host publication information

Title of host publication: 2013 IEEE International Conference on Multimedia and Expo, ICME 2013
Article number: 6607565
ISBN (Print): 9781479900152
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: Adaptive stream mining, dataflow graphs, dynamic data-driven adaptive systems
Source: Scopus
Source ID: 84885660099

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Bio-inspired service management framework: Green data-centres case study

The internet is evolving into a full-scale distributed service platform, offering a plethora of services from communications to business, entertainment, social connectivity and much more. The range of services and applications offered is diversifying, with new applications constantly emerging. For example, utility-based computing (e.g. HPC and cloud computing) which relies heavily on data-centre resources. These services will be more dynamic and sophisticated, providing a range of complex capabilities, which puts further burden on datacentres, in terms of supporting and managing these services. At the same time, society is becoming acutely aware of the significant energy burden the communications industry, and in particular data-centres, are becoming. With these trends in mind we propose a biologically inspired service framework that supports services which can autonomously carry out management functions. We then apply this framework to address the emerging problem of a sustainable future internet by autonomously migrating services to greener locations.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Wireless Communications and Positioning (WICO), Waterford Institute of Technology, Telecommunications Software and Systems Group (TSSG), University of Massachusetts Boston, Imperial College London and Nanyang Technological University
Contributors: Carroll, R., Balasubramaniam, S., Suzuki, J., Lee, C., Donnelly, W., Botvich, D.
Number of pages: 15
Pages: 278-292
Publication date: 2013
Peer-reviewed: Yes

Publication information

Journal: International Journal of Grid and Utility Computing
Volume: 4
Issue number: 4
ISSN (Print): 1741-847X
Ratings: 
  • Scopus rating (2013): CiteScore 0.81 SJR 0.176 SNIP 0.858
Original language: English
ASJC Scopus subject areas: Management Information Systems, Computer Science Applications, Applied Mathematics
Keywords: Bio-inspired services, Genetic algorithm, Green data-centres
Source: Scopus
Source ID: 84886912413

Research output: Contribution to journalArticleScientificpeer-review

Checking visual data flow programs with finite process models

A visual data flow language (VDFL) allows graphical presentation of a computer program in the form of a directed graph, where data tokens travel through the arcs of the graph, and the vertices present e.g. the input token streams, calculations, comparisons, and conditionals. Amongst their benefits, VDFLs allow parallel computing and they are presumed to improve the quality of programming due to their intuitive readability. Thus, they are also suitable for computing education. However, the token-based computational model allowing parallel processing may make the programs more complicated than what they look. We propose a method for checking properties of VDFL programs using finite state processes (FSPs) using a commonly available labelled transition system analyser (LTSA) tool. The method can also be used to study different VDFL programming constructs for development or re-design of VDFLs. For our method, we have implemented a compiler that compiles a textual representation of a VDFL into FSPs.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research Community on Data-to-Decision (D2D), Mathematical modelling with wide societal impact (MathImpact), Ita-Suomen yliopisto
Contributors: Nummenmaa, J., Marttila-Kontio, M., Nummenmaa, T.
Number of pages: 14
Pages: 245-258
Publication date: 2013

Host publication information

Title of host publication: 13th Symposium on Programming Languages and Software Tools, SPLST 2013 - Proceedings
Publisher: University of Szeged
ISBN (Electronic): 9789633062289
ASJC Scopus subject areas: Computer Science Applications, Software
Source: Scopus
Source ID: 84923622331

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Chip-to-package wireless power transfer and its application to mm-Wave antennas and monolithic radiometric receivers

A chip-to-package wireless power transfer concept is applied to MMIC and antennas on LCP substrate is presented. Electromagnetic simulations show the feasibility of the proposed approach. As a benchmarking topology at the working frequency of 35.4 GHz, an Archimedean spiral antenna matched to a heterogeneous transformer, which couples the power received by the antenna to the chip, has been simulated. Transistor level circuit simulations are also proposed for the LNA and the detector, which together will constitute the system-on-chip (SoC) radiometer to be integrated in the LCP-SoP.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), University of Perugia, Georgia Institute of Technology
Contributors: Aluigi, L., Thai, T. T., Tentzeris, M. M., Roselli, L., Alimenti, F.
Number of pages: 3
Pages: 202-204
Publication date: 2013

Host publication information

Title of host publication: RSW 2013 - 2013 IEEE Radio and Wireless Symposium - RWW 2013
Article number: 6486688
ISBN (Print): 9781467329309
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications, Electrical and Electronic Engineering, Communication
Keywords: Electromagnetic coupling, flexible electronics, heterogeneous integration, imaging, LNA, mm-wave, SoC, SoP
Source: Scopus
Source ID: 84876750099

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Design and simulation of a slotted patch antenna sensor for wireless strain sensing

In this work, a slotted patch antenna is employed as a wireless sensor for monitoring structural strain and fatigue crack. Using antenna miniaturization techniques to increase the current path length, the footprint of the slotted patch antenna can be reduced to one quarter of a previously presented folded patch antenna. Electromagnetic simulations show that the antenna resonance frequency varies when the antenna is under strain. The resonance frequency variation can be wirelessly interrogated and recorded by a radiofrequency identification (RFID) reader, and can be used to derive strain/deformation. The slotted patch antenna sensor is entirely passive (battery-free), by exploiting an inexpensive off-the-shelf RFID chip that receives power from the wireless interrogation by the reader.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Georgia Institute of Technology, School of Electrical and Computer Engineering, Virginia Tech
Contributors: Yi, X., Cho, C., Cook, B., Wang, Y., Tentzeris, M. M., Leon, R. T.
Publication date: 2013

Host publication information

Title of host publication: Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013
Volume: 8694
Article number: 86941J
ISBN (Print): 9780819494771
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: RFID, Slotted patch antenna, Strain sensor, Wireless passive sensor
Source: Scopus
Source ID: 84878419679

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Exploiting RSS measurements among neighbouring devices: A matter of trust

In this paper we present experimental evaluations of cooperative ranging-based approaches in mobile positioning. Our main contribution is represented by experimental investigations, analysis of the errors introduced in the distance estimation and exploitation of the knowledge of environmental perturbations with a NLLS algorithm, highlighting the limits of such cooperative schemes, proving that the effect of cooperation might be very limited in real-life scenarios.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Electronics and Communications Engineering, Research group: System-on-Chip for GNSS, Wireless Communications and Cyber-Physical Embedded Computing, Wireless Communications and Positioning (WICO), Aalborg University
Contributors: Rosa, F. D., Paakki, T., Nurmi, J., Pelosi, M.
Publication date: 2013

Host publication information

Title of host publication: 2013 International Conference on Indoor Positioning and Indoor Navigation, IPIN 2013
Publisher: IEEE COMPUTER SOCIETY PRESS
ISBN (Print): 9781479940431
ASJC Scopus subject areas: Computer Science Applications
Keywords: Cooperation, peer-to-peer, Positioning, WiFi
Source: Scopus
Source ID: 84902204262

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

How do students solve parsons programming problems? - Execution-based vs. line-based feedback

In large introductory programming classes, there typically are no resources for adequate individual guidance. Automatic feedback for programming tasks can facilitate students' learning by allowing them to get immediate individual feedback regardless of time and place. This paper presents a study on how the type of automatic feedback in Parsons problems affects how students solve them. Students on their first programming class were divided into two groups and, in two assignments, each group in turn received different type of feedback. The type of feedback had an effect on how students constructed their programs and how quickly they were able to complete them. With feedback based on execution as opposed to the visible arrangement of code, the programs were more frequently executable when feedback was requested and, overall, feedback was requested less frequently. Based on the analysis, we discuss possible future improvements to automatic feedback in this type of an assignment.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Regulation of learning and active learning methods (REALMEE), Aalto University, Department of Computer Science and Eng.
Contributors: Helminen, J., Ihantola, P., Karavirta, V., Alaoutinen, S.
Number of pages: 7
Pages: 55-61
Publication date: 2013

Host publication information

Title of host publication: Proceedings - 2013 Learning and Teaching in Computing and Engineering, LaTiCE 2013
Article number: 6542239
ISBN (Print): 9780769549606
ASJC Scopus subject areas: Computer Science Applications, Education
Keywords: Automatic Feedback, Parsons Puzzles, Python
Source: Scopus
Source ID: 84881103728

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Inkjet printing of radio frequency electronics: Design methodologies and application of novel nanotechnologies

We discuss here the use of inkjet printing technology as an attractive alternative for the fabrication of radio frequency (RF) electronics. Inkjet printing is compared to widelyused traditional methods such as wet etching and mechanical milling with discussion of the advantages and potential disadvantages afforded by the technology. Next the paper presents the current state of the art for RF printed electronics, including fundamental fabrication technologies, methodologies, and materials. Included are detailed discussions of the fabrication of foundational conductive elements, integration of external elements via low temperature bonding techniques, and enhancement strategies focusing on the addition of novel materials. We then present some current challenges related to inkjet printing, along with some exciting recent advances in materials technology seeking to overcome the current limitations and to expand the frontier of the technology. Following are multiple examples detailing the successful use of inkjet printing methods in the creation of novel RF devices, providing proof of concept and illustrating in greater detail the concepts presented in the theoretical sections.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, School of Electrical and Computer Engineering
Contributors: Le, T., Lin, Z., Vyas, R., Lakafosis, V., Yang, L., Traille, A., Tentzeris, M. M., Wong, C. P.
Publication date: 2013
Peer-reviewed: Yes

Publication information

Journal: Journal of Electronic Packaging
Volume: 135
Issue number: 1
Article number: 011007
ISSN (Print): 1043-7398
Ratings: 
  • Scopus rating (2013): CiteScore 0.94 SJR 0.43 SNIP 0.804
Original language: English
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Mechanics of Materials, Computer Science Applications, Electrical and Electronic Engineering
Keywords: Annealing, CNT, Conductive silver ink, Direct write, Electrical design, Flexible circuits, Graphene, Inkjet-printed electronics, Low temperature bonding, Microwave, Organic electronics, Paper-based electronics, Sensors, SOP
Source: Scopus
Source ID: 84878547011

Research output: Contribution to journalArticleScientificpeer-review

Magnetomechanical coupled FE simulations of rotating electrical machines

Purpose - The purpose is to implement and compare different approaches for modelling the magnetostriction phenomenon in iron sheet used in rotating electrical machines. Design/methodology/approach - In the force-based approach, the magnetostriction is modelled as a set of equivalent forces, which produce the same deformation of the material as the magnetostriction strains. These forces among other magnetic forces are computed from the solution of the finite element (FE) field computation and used as loads for the displacement-based mechanical FE analysis. In the strain-based approach, the equivalent magnetostrictive forces are not needed and an energy-based model is used to define magnetomechanically coupled constitutive equations of the material. These equations are then space-discretised and solved with the FE method for the magnetic field and the displacements. Findings - It is found that the equivalent forces method can reproduce the displacements and strains of the structure but it results in erroneous stress states. The energy-based method has the ability to reproduce both the stress and strains correctly; thus enabling the analysis of stress-dependent quantities such as the iron losses and the magnetostriction itself. Research limitations/implications - The investigated methods do not account for hysteresis and other dynamic effects. They also require long computation times. With the available computing resources, the computation time does not present any problem as far as they are not used in everyday design procedures but the modelling of dynamic effect needs to be elaborated. Originality/value - The developed and implemented methods are verified with measurements and simulation experiments and applied to as complex structure as an electrical machine. The problems related to the different approaches are investigated and explained through simulations. © Emerald Group Publishing Limited.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Mechanical Engineering and Industrial Systems, Life Cycle Effectiveness of the Built Environment (LCE@BE), Smart Energy Systems (SES), Aalto University
Contributors: Belahcen, A., Fonteyn, K., Kouhia, R., Rasilo, P., Arkkio, A.
Number of pages: 16
Pages: 1484-1499
Publication date: 2013
Peer-reviewed: Yes

Publication information

Journal: COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering
Volume: 32
Issue number: 5
Article number: 17095978
ISSN (Print): 0332-1649
Ratings: 
  • Scopus rating (2013): CiteScore 0.55 SJR 0.215 SNIP 0.6
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Computational Theory and Mathematics, Applied Mathematics
Keywords: Coupled systems, Electrical equipment, Finite element simulation, Iron, Iron losses, Magnetoelasticity, Stress, Stress analysis

Bibliographical note

Contribution: organisation=ede,FACT1=1<br/>Portfolio EDEND: 2013-10-29<br/>Publisher name: Emerald Group Publishing

Source: researchoutputwizard
Source ID: 1975

Research output: Contribution to journalArticleScientificpeer-review

Multidimensional sequence classification based on fuzzy distances and discriminant analysis

In this paper, we present a novel method aiming at multidimensional sequence classification. We propose a novel sequence representation, based on its fuzzy distances from optimal representative signal instances, called statemes. We also propose a novel modified clustering discriminant analysis algorithm minimizing the adopted criterion with respect to both the data projection matrix and the class representation, leading to the optimal discriminant sequence class representation in a low-dimensional space, respectively. Based on this representation, simple classification algorithms, such as the nearest subclass centroid, provide high classification accuracy. A three step iterative optimization procedure for choosing statemes, optimal discriminant subspace and optimal sequence class representation in the final decision space is proposed. The classification procedure is fast and accurate. The proposed method has been tested on a wide variety of multidimensional sequence classification problems, including handwritten character recognition, time series classification and human activity recognition, providing very satisfactory classification results.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Number of pages: 12
Pages: 2564-2575
Publication date: 2013
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Knowledge and Data Engineering
Volume: 25
Issue number: 11
ISSN (Print): 1041-4347
Ratings: 
  • Scopus rating (2013): CiteScore 4.61 SJR 1.385 SNIP 4.055
Original language: English
ASJC Scopus subject areas: Computational Theory and Mathematics, Information Systems, Computer Science Applications
Keywords: clustering-based discriminant analysis, codebook learning, fuzzy vector quantization, Sequence classification
Source: Scopus
Source ID: 84884791250

Research output: Contribution to journalArticleScientificpeer-review

Multi-physics modeling and simulation of a slotted patch antenna for wireless strain sensing

This research studies multi-physics simulation of a slotted patch antenna sensor. In our previous work, a folded patch antenna was designed for passive wireless strain and crack sensing. When experiencing deformation, the antenna shape changes, causing shift in electromagnetic resonance frequency of the antenna. The wireless interrogation system utilizes the principle of electromagnetic backscattering and adopts off-the-shelf 900MHz radiofrequency identification (RFID) technology. In this research, a slotted patch antenna sensor is designed, while maintaining antenna resonance frequency to be around 900MHz. The slotted antenna detours surface current using slotted patterns, so that the electrical length is kept similar as previous folded patch antenna sensor yet sensor footprint is reduced. To accurately describe both mechanical and electromagnetic behaviors of the antenna sensor, a multi-physics coupled simulation approach is pursued. A multiphysics finite element model uses the same geometry and meshing for both mechanical and electromagnetic simulations. Because electromagnetism has little influence on the mechanical behavior of the sensor, displacement field and electrical field can be solved separately using segregated steps. Known as sequential coupling, the solution method involves two or more analyses, each solving for a different physical field. The mechanics-electromagnetics coupled simulation is implemented using a commercial software package, COMSOL. Strain sensing performance predicted by the multi-physics simulation is presented.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, School of Civil and Environmental Engineering, Georgia Institute of Technology, School of Electrical and Computer Engineering, Virginia Tech
Contributors: Yi, X., Wang, Y., Tentzeris, M. M., Leon, R. T.
Number of pages: 8
Pages: 1857-1864
Publication date: 2013

Host publication information

Title of host publication: Structural Health Monitoring 2013: A Roadmap to Intelligent Structures - Proceedings of the 9th International Workshop on Structural Health Monitoring, IWSHM 2013
Volume: 2
Publisher: DEStech Publications
ISBN (Electronic): 9781605951157
ASJC Scopus subject areas: Computer Science Applications, Health Information Management
Source: Scopus
Source ID: 84945174604

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

On the optimal class representation in linear discriminant analysis

Linear discriminant analysis (LDA) is a widely used technique for supervised feature extraction and dimensionality reduction. LDA determines an optimal discriminant space for linear data projection based on certain assumptions, e.g., on using normal distributions for each class and employing class representation by the mean class vectors. However, there might be other vectors that can represent each class, to increase class discrimination. In this brief, we propose an optimization scheme aiming at the optimal class representation, in terms of Fisher ratio maximization, for LDA-based data projection. Compared with the standard LDA approach, the proposed optimization scheme increases class discrimination in the reduced dimensionality space and achieves higher classification rates in publicly available data sets.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Number of pages: 7
Pages: 1491-1497
Publication date: 2013
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Neural Networks and Learning Systems
Volume: 24
Issue number: 9
ISSN (Print): 2162-237X
Ratings: 
  • Scopus rating (2013): CiteScore 5.5 SJR 2.33 SNIP 3.576
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Computer Networks and Communications, Computer Science Applications, Software
Keywords: Class representation, data projection, linear discriminant analysis (LDA), subspace learning
Source: Scopus
Source ID: 84882899597

Research output: Contribution to journalArticleScientificpeer-review

Person identification from actions based on dynemes and discriminant learning

In this paper we present a view-independent person identification method exploiting motion information. A multi-camera setup is used in order to capture the human body during action execution from different viewing angles. The method is able to incorporate several everyday actions in person identification. A comparative study of the discriminative ability of different actions for person identification is provided, denoting that several actions, except walk, can be exploited for person identification.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Publication date: 2013

Host publication information

Title of host publication: 2013 International Workshop on Biometrics and Forensics, IWBF 2013
ISBN (Print): 9781467349895
ASJC Scopus subject areas: Biotechnology, Computer Science Applications
Keywords: Action-based person identification, Classification results fusion, Discriminant learning, Dyneme video representation
Source: Scopus
Source ID: 84881350564

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Preparation of water-based carbon nanotube inks and application in the inkjet printing of carbon nanotube gas sensors

Water-based carbon nanotube (CNT) is highly desirable for inkjet printing devices due to its environmentally benign and low-cost features. To improve the dispersion of CNT in water, oxygen-containing functional groups are introduced into the surface of CNT via an acid oxidation process. The CNT-based gas sensor is fabricated by inkjet printing, which shows a high sensitivity toward NO 2. The application of inkjet-printed CNT in a printed RF antenna for wireless sensing is also discussed.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Georgia Institute of Technology, School of Electrical and Computer Engineering, Georgia Tech Research Institute, Chinese University of Hong Kong
Contributors: Lin, Z., Le, T., Song, X., Yao, Y., Li, Z., Moon, K. S., Tentzeris, M. M., Wong, C. P.
Publication date: 2013
Peer-reviewed: Yes

Publication information

Journal: Journal of Electronic Packaging
Volume: 135
Issue number: 1
Article number: 011001
ISSN (Print): 1043-7398
Ratings: 
  • Scopus rating (2013): CiteScore 0.94 SJR 0.43 SNIP 0.804
Original language: English
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Mechanics of Materials, Computer Science Applications, Electrical and Electronic Engineering
Keywords: Carbon Nanotube, Inkjet Printing, Nanotechnology, Water-Based Ink, Wireless Gas Sensor
Source: Scopus
Source ID: 84878587853

Research output: Contribution to journalArticleScientificpeer-review

Service-oriented approach to improve interoperability of e-learning systems

We present a design and open source implementation for a service oriented e-learning system, which utilizes external services for supporting a wide range of learning content and also offers a REST API for external clients to fetch information stored in the system. The design will separate different concerns, such as user authentication and exercise assessment, into separate services, which together form a complete e-learning environment. A key component of the design is identifying a general set of characteristics among existing exercise assessment systems, by which the assessment methods are grouped into three types: synchronous, asynchronous and static exercises.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Regulation of learning and active learning methods (REALMEE), Aalto University, Department of Computer Science and Eng., Houston Inc. Consulting Oy
Contributors: Karavirta, V., Ihantola, P., Koskinen, T.
Number of pages: 5
Pages: 341-345
Publication date: 2013

Host publication information

Title of host publication: Proceedings - 2013 IEEE 13th International Conference on Advanced Learning Technologies, ICALT 2013
Article number: 6601947
ISBN (Print): 9780769550091
ASJC Scopus subject areas: Computer Science Applications
Keywords: automatic assessment, e-learning, interoperability, LMS, service oriented
Source: Scopus
Source ID: 84885222805

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Towards an approach for evaluating the quality of requirements

In engineering design, the needs of stakeholders are often captured and expressed in natural language (NL). While this facilitates such tasks as sharing information with nonspecialists, there are several associated problems including ambiguity, incompleteness, understandability, and testability. Traditionally, these issues were managed through tedious procedures such as reading requirements documents and looking for errors, but new approaches are being developed to assist designers in collecting, analysing, and clarifying requirements. The quality of the end-product is strongly related to the clarity of requirements and, thus, requirements should be managed carefully. This paper proposes to combine diverse requirements quality measures found from literature. These metrics are coherently integrated in a single software tool. This paper also proposes a new metric for clustering requirements based on their similarity to increase the quality of requirement model. The proposed methodology is tested on a case study and results show that this tool provides designers with insight on the quality of individual requirements as well as with a holistic assessment of the entire set of requirements.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Intelligent dexterity for secure networked infrastructure and applications (IDSNIA), Aalto University
Contributors: Mokammel, F., Coatanea, E., Christophe, F., Ba Khouya, M., Medyna, G.
Publication date: 2013

Host publication information

Title of host publication: 33rd Computers and Information in Engineering Conference
Volume: 2 B
Publisher: American Society of Mechanical Engineers
Article number: V02BT02A024
ISBN (Print): 9780791855867
ASJC Scopus subject areas: Mechanical Engineering, Computer Graphics and Computer-Aided Design, Computer Science Applications, Modelling and Simulation
Source: Scopus
Source ID: 84896914578

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

View-independent human action recognition based on multi-view action images and discriminant learning

In this paper a novel view-independent human action recognition method is proposed. A multi-camera setup is used to capture the human body from different viewing angles. Actions are described by a novel action representation, the so-called multi-view action image (MVAI), which effectively addresses the camera viewpoint identification problem, i.e., the identification of the position of each camera with respect to the person's body. Linear Discriminant Analysis is applied on the MVAIs in order to to map actions to a discriminant feature space where actions are classified by using a simple nearest class centroid classification scheme. Experimental results denote the effectiveness of the proposed action recognition approach.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Publication date: 2013

Host publication information

Title of host publication: 2013 IEEE 11th IVMSP Workshop: 3D Image/Video Technologies and Applications, IVMSP 2013 - Proceedings
ISBN (Print): 9781467358583
ASJC Scopus subject areas: Computer Graphics and Computer-Aided Design, Computer Vision and Pattern Recognition, Computer Science Applications
Keywords: Discriminant Learning, Human Action Recognition, Multi-camera Setup, Multi-view Action Images
Source: Scopus
Source ID: 84888154998

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Virtualizing power cords by wireless power transmission and energy harvesting

In this paper, we introduce two different approaches for the virtualization of power cords for electrical devices. The first approach is a new concept for routing electric power by wireless transfer on two-dimensional surfaces, such as floors and walls. Unlike any other existing wireless power transfer scheme, this method can deliver electric power over a wide range with minimal loss. We realize this method using multi-hop displacement of a magnetic antenna array. Each array element can be selectively resonated with adjacent elements to deliver power without physical contact. The second approach utilizes far-field RF energy harvesting. Using an efficient voltage multiplier and adaptive software-based control, it is possible to operate low-power wireless sensors continuously.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), University of Tokyo, Georgia Institute of Technology
Contributors: Kawahara, Y., Wei, W., Narusue, Y., Shigeta, R., Asami, T., Tentzeris, M.
Number of pages: 3
Pages: 37-39
Publication date: 2013

Host publication information

Title of host publication: RSW 2013 - 2013 IEEE Radio and Wireless Symposium - RWW 2013
Article number: 6486633
ISBN (Print): 9781467329309
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications, Electrical and Electronic Engineering, Communication
Keywords: RF energy harvesting, Wireless power transmission
Source: Scopus
Source ID: 84876754120

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Wireless chipless passive electromagnetic transducers for SHM applications

The energy autonomy of wireless sensors is crucial especially for buried or inaccessible sensors that are often the case in SHM applications. This problem can be overcome by using classical passive sensors (RFID or SAW sensors) but they suffer from a problem of low reading distances (&lt;10m). For few years emerged a new kind of passive sensors using electromagnetic transducers, combining very high autonomy, high resistance to harsh environment, potential interrogation distance higher than SAW sensors and wide variety of sensing principles. We started to work in this new research field in 2005 and several sensor principles have been validated in our lab (pressure, temperature, stress) with FMCW (Frequency Modulated Continuous Wave) Radar interrogation.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), University of Toulouse, INP, LAAS-CNRS, Georgia Institute of Technology
Contributors: Pons, P., Aubert, H., Tentzeris, M.
Number of pages: 8
Pages: 577-584
Publication date: 2013

Host publication information

Title of host publication: Structural Health Monitoring 2013: A Roadmap to Intelligent Structures - Proceedings of the 9th International Workshop on Structural Health Monitoring, IWSHM 2013
Volume: 1
Publisher: DEStech Publications
ISBN (Electronic): 9781605951157
ASJC Scopus subject areas: Computer Science Applications, Health Information Management
Source: Scopus
Source ID: 84945197244

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Variable switching point predictive torque control

In this paper an approach to include a variable switching time point into predictive torque control (PTC) is introduced. In PTC the switching frequency is limited by the sampling frequency; its theoretical maximum value is half the sampling frequency. In reality, however, the switching frequency is lower than this value, resulting in high current and torque ripples compared to modulator-based control methods. In order to overcome this an optimization problem is formulated and solved in real-time. The goal is to find the time point at which the switches of the inverter should change state in order to not only achieve the regulation of the torque and the flux magnitude to their references, but also the minimization of the torque ripple. Further advantages of the proposed method include the design flexibility and great performance during transients. Experimental results that verify the performance of the presented control strategy are included.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Smart Energy Systems (SES), Department of Electrical and Computer Engineering, National Technical University of Athens, Technische Universitat Munchen, University of Stellenbosch
Contributors: Karamanakos, P., Stolze, P., Kennel, R., Manias, S., Mouton, T.
Number of pages: 6
Pages: 422-427
Publication date: Feb 2013

Host publication information

Title of host publication: Proceedings - 2013 IEEE International Conference on Industrial Technology, ICIT 2013
ISBN (Print): 9781467345699
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications
Source: Scopus
Source ID: 84877596084

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Indirect measurement of the vascular endothelial glycocalyx layer thickness in human submucosal capillaries with a plug-in for ImageJ

Background: The thickness of vascular endothelial glycocalyx layer can be measured indirectly during a spontaneous leukocyte passage from oral submucosal capillaries in humans. The subsequent differences in red blood cell (RBC) column widths, before a spontaneous white blood cell passage (pre-WBC) and after a spontaneous WBC passage (post-WBC) can be used in off-line analysis to measure glycocalyx thickness: [pre-WBC width - post-WBC width]/2. We created and validated a semi-automatic plug-in for ImageJ to measure the endothelial glycocalyx layer thickness. Methods: Video clips presenting human sublingual microvasculature were created with a side-stream dark field imaging device. Spontaneous leukocyte passages in capillaries were analyzed from video clips with ImageJ. The capillary glycocalyx layer thickness was measured by the indirect approach with two manual and two semi-automatic methods. Results: There were no statistically significant differences between glycocalyx layer thicknesses measured with different methods, even though small inter-method differences in RBC column thicknesses could be detected. Inter-rater differences were systematically smaller with both semi-automatic methods. Intra-rater coefficient of variation [CV] (95% CI) was largest when measurements were made completely manually [9.2% (8.4-10.0)], but improved significantly with automatic image enhancement prior to manual measurement [7.2% (6.4-8.0)]. CV could be improved further when using semi-automatic analysis with an in-frame median filter radius of 1 pixel [5.8% (5.0-6.6)], or a median filter radius of 2 pixels [4.3% (3.5-5.1)]. Conclusions: Semi-automatic analysis of glycocalyx decreased the intra-rater CV and the inter-rater differences compared to the manual method. On average, each of the four methods yielded equal results for the glycocalyx thickness. Being the only feasible bed side method in most clinical scenarios, indirect measurement of glycocalyx thickness with orthogonal polarization spectral imaging or side-stream dark field imaging device and our plug-in can advance the study of glycocalyx layer pathology in man.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Integrated Technologies for Tissue Engineering Research (ITTE), Helsinki University Central Hospital, University of Helsinki, Uppsala University, Tampere University Hospital
Contributors: Liuhanen, S., Sallisalmi, M., Pettilä, V., Oksala, N., Tenhunen, J.
Number of pages: 10
Pages: 38-47
Publication date: Apr 2013
Peer-reviewed: Yes

Publication information

Journal: Computer Methods and Programs in Biomedicine
Volume: 110
Issue number: 1
ISSN (Print): 0169-2607
Ratings: 
  • Scopus rating (2013): CiteScore 2.28 SJR 0.628 SNIP 1.459
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Software, Health Informatics
Keywords: Endothelial surface layer, Glycocalyx, Imagej, Open source, Side-stream dark field
Source: Scopus
Source ID: 84875094399

Research output: Contribution to journalArticleScientificpeer-review

Transforming homo economicus into homo ludens: A field experiment on gamification in a utilitarian peer-to-peer trading service

During recent years, the addition of game mechanisms to non-game services has gained a relatively large amount of attention. Popular discussion connects gamification to successful marketing and increased profitability through higher customer engagement, however, there is a dearth of empirical studies that confirm such expectations. This paper reports the results of a field experiment, which gamifies a utilitarian peer-to-peer trading service by implementing the game mechanism of badges that users can earn from a variety of tasks. There were 3234 users who were randomly assigned to treatment groups and subjected to different versions of the badge system in a 2 × 2 design. The results show that the mere implementation of gamification mechanisms does not automatically lead to significant increases in use activity in the studied utilitarian service, however, those users who actively monitored their own badges and those of others in the study showed increased user activity.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematical modelling with wide societal impact (MathImpact), Department of Information and Service Economy, Aalto University
Contributors: Hamari, J.
Number of pages: 10
Pages: 236-245
Publication date: Jul 2013
Peer-reviewed: Yes

Publication information

Journal: Electronic Commerce Research and Applications
Volume: 12
Issue number: 4
ISSN (Print): 1567-4223
Ratings: 
  • Scopus rating (2013): CiteScore 2.6 SJR 0.93 SNIP 2.115
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Computer Networks and Communications, Marketing, Management of Technology and Innovation
Keywords: Badges, Collaborative consumption, Game design, Gamification, Service marketing, Social commerce
Source: Scopus
Source ID: 84883135229

Research output: Contribution to journalArticleScientificpeer-review

Transfer learning using a nonparametric sparse topic model

In many domains data items are represented by vectors of counts; count data arises, for example, in bioinformatics or analysis of text documents represented as word count vectors. However, often the amount of data available from an interesting data source is too small to model the data source well. When several data sets are available from related sources, exploiting their similarities by transfer learning can improve the resulting models compared to modeling sources independently. We introduce a Bayesian generative transfer learning model which represents similarity across document collections by sparse sharing of latent topics controlled by an Indian buffet process. Unlike a prominent previous model, hierarchical Dirichlet process (HDP) based multi-task learning, our model decouples topic sharing probability from topic strength, making sharing of low-strength topics easier. In experiments, our model outperforms the HDP approach both on synthetic data and in first of the two case studies on text collections, and achieves similar performance as the HDP approach in the second case study.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aalto University, deCODE Genetics
Contributors: Faisal, A., Gillberg, J., Leen, G., Peltonen, J.
Number of pages: 14
Pages: 124-137
Publication date: 18 Jul 2013
Peer-reviewed: Yes

Publication information

Journal: Neurocomputing
Volume: 112
ISSN (Print): 0925-2312
Ratings: 
  • Scopus rating (2013): CiteScore 2.95 SJR 0.817 SNIP 1.915
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Computer Science Applications, Cognitive Neuroscience
Keywords: Latent Dirichlet allocation, Nonparametric Bayesian inference, Small sample size, Sparsity, Topic models, Transfer learning
Source: Scopus
Source ID: 84877602437

Research output: Contribution to journalArticleScientificpeer-review

Comparison of Saltation, Amplitude Modulation, and a Hybrid Method of Vibrotactile Stimulation

Illusory vibrotactile movement can be used to provide directional tactile information on the skin. Our research question was how the presentation method affects the perception of vibrotactile movement. Illusion of vibrotactile mediolateral movement was elicited to a left dorsal forearm to investigate cognitive and emotional experiences to vibrotactile stimulation. Eighteen participants were presented with stimuli delivered to a linearly aligned row of three vibrotactile actuators. Three presentation methods were used-saltation, amplitude modulation, and a hybrid method-to form 12 distinct patterns of movement. First, the stimuli were compared pairwise using a two-alternative forced-choice procedure (same-different judgments). Second, the stimuli were rated using three nine-point bipolar scales measuring the continuity, pleasantness, and arousal of each stimulus. The stimuli presented with the amplitude modulation method were rated significantly more continuous and pleasant, and less arousing. Strong correlations between the cognition-related scale of continuity and the emotion-related scales of pleasantness and arousal were found: More continuous stimuli were rated more pleasant and less arousing.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Augmented Human Activities (AHA)
Contributors: Raisamo, J., Raisamo, R., Surakka, V.
Number of pages: 5
Pages: 517-521
Publication date: Oct 2013
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Haptics
Volume: 6
Issue number: 4
Article number: 6517847
ISSN (Print): 1939-1412
Ratings: 
  • Scopus rating (2013): CiteScore 3.1 SJR 0.754 SNIP 2.328
Original language: English
ASJC Scopus subject areas: Human-Computer Interaction, Computer Science Applications, Medicine(all)
Keywords: evaluation/methodology, haptic I/O, Information interfaces and representation (HCI), user interfaces
Source: Scopus
Source ID: 84890532189

Research output: Contribution to journalArticleScientificpeer-review

Importance of the ion-pair interactions in the OPEP coarse-grained force field: Parametrization and validation

We have derived new effective interactions that improve the description of ion pairs in the Optimized Potential for Efficient protein structure Prediction (OPEP) coarse-grained force field without introducing explicit electrostatic terms. The iterative Boltzmann inversion method was used to extract these potentials from all-atom simulations by targeting the radial distribution function of the distance between the center of mass of the side chains. The new potentials have stabilities, and number of ion pairs. Our modeling, by refining the packing of the charged amino acids, impacts the stability of secondary structure motifs and the population of intermediate states during temperature folding/unfolding; it also improves the aggregation propensity of peptides. The new version of the OPEP force field has the potentiality to describe more realistically a large spectrum of situations where salt-bridges are key interactions. (Figure Presented)

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Multi-scaled biodata analysis and modelling (MultiBAM), Université Paris Diderot, Laboratoire de Biochimie Théorique, Institut Universitaire de France
Contributors: Sterpone, F., Nguyen, P. H., Kalimeri, M., Derreumaux, P.
Number of pages: 11
Pages: 4574-4584
Publication date: 8 Oct 2013
Peer-reviewed: Yes

Publication information

Journal: Journal of Chemical Theory and Computation
Volume: 9
Issue number: 10
ISSN (Print): 1549-9618
Ratings: 
  • Scopus rating (2013): CiteScore 5.41 SJR 2.437 SNIP 1.558
Original language: English
ASJC Scopus subject areas: Physical and Theoretical Chemistry, Computer Science Applications

Bibliographical note

EXT="Kalimeri, Maria"

Source: Scopus
Source ID: 84891948959

Research output: Contribution to journalArticleScientificpeer-review

Wearable and implantable antennas for wireless body-centric sensing systems

In this poster abstract, we present recent advances on implantable and wearable antennas for wireless body-centric sensing systems. Prominent examples of such systems are the wireless brainmachine interface (BMI) system and wearable embroidered antennas. In the poster, we present more detailed simulation and measurement results.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research group: Wireless Identification and Sensing Systems Research Group, Department of Electronics and Communications Engineering, Sensing Systems for Wireless Medicine (MediSense), Nano Communication Centre, Berkeley, Electrical Engineering Department, University of California, Los Angeles (UCLA)
Contributors: Björninen, T., Moradi, E., Koski, K., Sydänheimo, L., Ukkonen, L., Muller, R., Ledochowitsch, P., Rabaey, J. M., Rahmat-Samii, Y.
Number of pages: 1
Pages: 288
Publication date: 29 Oct 2013

Host publication information

Title of host publication: BODYNETS 2013 - 8th International Conference on Body Area Networks
Publisher: ICST
ISBN (Electronic): 9781936968893
ASJC Scopus subject areas: Computer Science Applications, Computer Networks and Communications, Artificial Intelligence
Source: Scopus
Source ID: 84947068176

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

[COMMODE] a large-scale database of molecular descriptors using compounds from PubChem

Background: Molecular descriptors have been extensively used in the field of structure-oriented drug design and structural chemistry. They have been applied in QSPR and QSAR models to predict ADME-Tox properties, which specify essential features for drugs. Molecular descriptors capture chemical and structural information, but investigating their interpretation and meaning remains very challenging.Results: This paper introduces a large-scale database of molecular descriptors called COMMODE containing more than 25 million compounds originated from PubChem. About 2500 DRAGON-descriptors have been calculated for all compounds and integrated into this database, which is accessible through a web interface at http://commode.i-med.ac.at.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Oncotyrol, Institute for Bioinformatics and Translational Research, Innsbruck Medical University, Computational Biology and Machine Learning Lab., Faculty of Medicine, Health and Life Sciences, Queen's University, Belfast, Northern Ireland
Contributors: Dander, A., Mueller, L. A. J., Gallasch, R., Pabinger, S., Emmert-Streib, F., Graber, A., Dehmer, M.
Publication date: 13 Nov 2013
Peer-reviewed: Yes

Publication information

Journal: Source Code for Biology and Medicine
Volume: 8
Article number: 22
ISSN (Print): 1751-0473
Ratings: 
  • Scopus rating (2013): CiteScore 1.37 SJR 0.529 SNIP 0.46
Original language: English
ASJC Scopus subject areas: Information Systems, Computer Science Applications, Information Systems and Management, Health Informatics
Keywords: Chemical databases, Molecular descriptors, PubChem, QSAR, QSPR
Source: Scopus
Source ID: 84887399081

Research output: Contribution to journalArticleScientificpeer-review

Social Network Games: Players' Perspectives

This article presents the results of an interview study on how people perceive and play social network games on Facebook. During recent years, social games have become the biggest genre of games if measured by the number of registered users. These games are designed to cater for large audiences in their design principles and values, a free-to-play revenue model and social network integration that make them easily approachable and playable with friends. Although these games have made the headlines and have been seen to revolutionize the game industry, we still lack an understanding of how people perceive and play them. For this article, we interviewed 18 Finnish Facebook users from a larger questionnaire respondent pool of 134 people. This study focuses on a user-centric approach, highlighting the emergent experiences and the meaning-making of social games players. Our findings reveal that social games are usually regarded as single player games with a social twist, and as suffering partly from their design characteristics, while still providing a wide spectrum of playful experiences for different needs. The free-to-play revenue model provides an easy access to social games, but people disagreed with paying for additional content for several reasons.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematical modelling with wide societal impact (MathImpact)
Contributors: Paavilainen, J., Hamari, J., Stenros, J., Kinnunen, J.
Number of pages: 27
Pages: 794-820
Publication date: Dec 2013
Peer-reviewed: Yes

Publication information

Journal: SIMULATION AND GAMING
Volume: 44
Issue number: 6
ISSN (Print): 1046-8781
Ratings: 
  • Scopus rating (2013): CiteScore 1.21 SJR 0.444 SNIP 1.018
Original language: English
ASJC Scopus subject areas: Business, Management and Accounting (miscellaneous), Computer Science Applications
Keywords: attitudes, experience, Facebook, free-to-play, frustration, game design, gameplay, interviews, micropayments, motivation, perception, playful experience, sociability, social games, social networks, user study, video games
Source: Scopus
Source ID: 84891936877

Research output: Contribution to journalArticleScientificpeer-review

Netmes: Assessing gene network inference algorithms by network-based measures

Gene regulatory network inference (GRNI) algorithms are essential for efficiently utilizing large-scale microarray datasets to elucidate biochemical interactions among molecules in a cell. Recently, the combination of network-based error measures complemented with an ensemble approach became popular for assessing the inference performance of the GRNI algorithms. For this reason, we developed a software package to facilitate the usage of such metrics. In this paper, we present netmes, an R software package that allows the assessment of GRNI algorithms. The software package netmes is available from the R-Forge web site https://r-forge.r-project.org/projects/netmes/.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Bahçeşehir University, Yildiz Technical University, UMIT - The Health and Life Sciences University, Computational Biology and Machine Learning Lab., Faculty of Medicine, Health and Life Sciences, Queen's University, Belfast, Northern Ireland
Contributors: Altay, G., Kurt, Z., Dehmer, M., Emmert-Streib, F.
Publication date: 7 Dec 2013
Peer-reviewed: Yes

Publication information

Journal: Evolutionary Bioinformatics
Volume: 10
ISSN (Print): 1176-9343
Ratings: 
  • Scopus rating (2013): CiteScore 1.23 SJR 0.565 SNIP 0.406
Original language: English
ASJC Scopus subject areas: Ecology, Evolution, Behavior and Systematics, Computer Science Applications, Genetics
Keywords: Gene regulatory networks, Global network-based measures, Local network-based measures, Metrics for assessing ensemble datasets, R package for the network-based measures
Source: Scopus
Source ID: 84893596910

Research output: Contribution to journalArticleScientificpeer-review

Learning sparse representations for view-independent human action recognition based on fuzzy distances

In this paper, a method aiming at view-independent human action recognition is presented. Actions are described as series of successive human body poses. Action videos representation is based on fuzzy vector quantization, while action classification is performed by a novel classification algorithm, the so-called Sparsity-based Learning Machine (SbLM), involving two optimization steps. The first one determines a non-linear data mapping to a high-dimensional feature space determined by an l1-minimization process exploiting an overcomplete dictionary formed by the training samples. The second one, involves a training process in order to determine the optimal separating hyperplanes in the resulted high-dimensional feature space. The performance of the proposed human action recognition method is evaluated on two publicly available action recognition databases aiming at different application scenarios.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Number of pages: 10
Pages: 344-353
Publication date: 9 Dec 2013
Peer-reviewed: Yes

Publication information

Journal: Neurocomputing
Volume: 121
ISSN (Print): 0925-2312
Ratings: 
  • Scopus rating (2013): CiteScore 2.95 SJR 0.817 SNIP 1.915
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Computer Science Applications, Cognitive Neuroscience
Keywords: Action classification, Activity recognition, Fuzzy vector quantization, Sparse data representation
Source: Scopus
Source ID: 84884142409

Research output: Contribution to journalArticleScientificpeer-review

A hand-held immaterial volumetric display

We have created an ultralight, movable, "immaterial" fogscreen. It is based on the fogscreen mid-air imaging technology. The hand-held unit is roughly the size and weight of an ordinary toaster. If the screen is tracked, it can be swept in the air to create mid-air slices of volumetric objects, or to show augmented reality (AR) content on top of real objects. Interfacing devices and methodologies, such as hand and gesture trackers, camera-based trackers and object recognition, can make the screen interactive. The user can easily interact with any physical object or virtual information, as the screen is permeable. Any real objects can be seen through the screen, instead of e.g., through a video-based augmented reality screen. It creates a mixed reality setup where both the real world object and the augmented reality content can be viewed and interacted with simultaneously. The hand-held mid-air screen can be used e.g., as a novel collaborating or classroom tool for individual students or small groups.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA), University of Tampere
Contributors: Sand, A., Rakkolainen, I.
Publication date: 2014

Host publication information

Title of host publication: Proceedings of SPIE-IS and T Electronic Imaging - Stereoscopic Displays and Applications XXV
Volume: 9011
Publisher: SPIE
Article number: 90110Q
ISBN (Print): 9780819499288
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Computer Science Applications, Applied Mathematics, Electrical and Electronic Engineering
Keywords: display technology, Fog screen, mixed reality, volumetric, walk-through screen
Source: Scopus
Source ID: 84901008644

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

An origami inspired reconfigurable spiral antenna

Modern day systems often require reconfigurability in the operating parameters of the transmit and receive antennas, such as the resonant frequency, radiation pattern, impedance, or polarization. In this work a novel approach to antenna reconfigurability is presented by integrating antennas with the ancient art of origami. The proposed antenna consists of an inkjet printed center-fed spiral antenna, which is designed to resonate at 1.0GHz and have a reconfigurable radiation pattern while maintaining the 1.0GHz resonance with little variation in input impedance. When flat, the antenna is a planar spiral exhibiting a bidirectional radiation pattern. By a telescoping action, the antenna can be reconfigured into a conical spiral with a directional pattern and higher gain, which gives the antenna a large front-to-back ratio. Construction of the antenna in this manner allows for a simple, lightweight, transportable antenna that can expand to specifications in the field.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology
Contributors: Saintsing, C. D., Cook, B. S., Tentzeris, M. M.
Publication date: 2014

Host publication information

Title of host publication: 38th Mechanisms and Robotics Conference
Volume: 5B
Publisher: The American Society of Mechanical Engineers ASME
ISBN (Electronic): 9780791846377
ASJC Scopus subject areas: Modelling and Simulation, Mechanical Engineering, Computer Science Applications, Computer Graphics and Computer-Aided Design
Source: Scopus
Source ID: 84926029890

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Avoiding anomalies when modeling a many-to-many relationship in a multidimensional database

Multidimensional database cubes are easier to design and use when the dimension attributes and fact table measures are in one-to-many relation-ships in the data warehouse. The anomalies that can arise when users browse a cube that incorporates dimensions with many-to-many relationships are widely documented by practitioners. We categorise many-to-many relationships in terms of their associated design problems and we present two techniques for modelling restricted forms of many-to-many relationships. We demonstrate that the techniques can avoid anomalies and we discuss performance implications.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research Community on Data-to-Decision (D2D), Mathematical modelling with wide societal impact (MathImpact)
Contributors: Thanisch, P., Lindell, T., Nummenmaa, J., Nummenmaa, T.
Publication date: 2014

Host publication information

Title of host publication: BIR 2009 - 8th International Conference on Perspectives in Business Informatics Research
Publisher: Kristianstad Academic Press
ASJC Scopus subject areas: Management of Technology and Innovation, Computer Science Applications
Source: Scopus
Source ID: 84918824678

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Building energy-efficiency interventions in North-East Europe: Effects on indoor environmental quality and public health

INSULAtE project aims to develop a common protocol for assessment of improving energy efficiency (EE) of dwellings on indoor environmental quality (IEQ) and public health in Europe. So far, measurement data on IEQ parameters (PM, CO, CO2, VOCs, formaldehyde, NO2, radon, T and RH) and questionnaire data from occupants were collected from 16 multifamily buildings (94 apartments) in Finland and 20 (96 apartments) in Lithuania before renovation. Most parameters were within recommended limits; however, the data revealed different baselines (before renovation) for each country both in terms of the IEQ parameters and the respondents' satisfaction regarding their residence and indoor air quality. Post renovation data (from one building in each country) showed potential changes in the measured parameters, while further analyses are needed once the data have been collected. The results of this project will be used in developing guidance and support the implementation of the related policies.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Life Cycle Effectiveness of the Built Environment (LCE@BE), Research group: Concrete and Bridge Structures, Department of Civil Engineering, Research group: Responsible Construction, National Public Health Institute, Kaunas University of Technology
Contributors: Du, L., Prasauskas, T., Leivo, V., Turunen, M., Aaltonen, A., Kiviste, M., Martuzevicius, D., Haverinen-Shaughnessy, U.
Number of pages: 3
Pages: 637-639
Publication date: 2014

Host publication information

Title of host publication: Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate
Publisher: International Society of Indoor Air Quality and Climate
ASJC Scopus subject areas: Pollution, Building and Construction, Health, Toxicology and Mutagenesis, Computer Science Applications
Keywords: Environmental monitoring, Exposure, Health questionnaire, Residential buildings
Source: Scopus
Source ID: 84924672127

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Characterization of charge in airborne fungal spores

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Physics, Research area: Aerosol Physics, Research area: Optics, Urban circular bioeconomy (UrCirBio), University of Cincinnati, Ita-Suomen yliopisto, Dekati Ltd
Contributors: Reponen, T., Saari, S., Mensah-Attipoe, J., Ukkonen, A., Veijalainen, A., Pasanen, P., Keskinen, J.
Number of pages: 3
Pages: 359-361
Publication date: 2014

Host publication information

Title of host publication: Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate
Publisher: International Society of Indoor Air Quality and Climate
ASJC Scopus subject areas: Pollution, Building and Construction, Health, Toxicology and Mutagenesis, Computer Science Applications
Keywords: Aerosolization, Agar, Air velocity, Surface
Source: Scopus
Source ID: 84924739791

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Compressive strain measurement using RFID patch antenna sensors

In this research, two radiofrequency identification (RFID) antenna sensor designs are tested for compressive strain measurement. The first design is a passive (battery-free) folded patch antenna sensor with a planar dimension of 61mm × 69mm. The second design is a slotted patch antenna sensor, whose dimension is reduced to 48mm × 44mm by introducing slots on antenna conducting layer to detour surface current path. A three-point bending setup is fabricated to apply compression on a tapered aluminum specimen mounted with an antenna sensor. Mechanics-electromagnetics coupled simulation shows that the antenna resonance frequency shifts when each antenna sensor is under compressive strain. Extensive compression tests are conducted to verify the strain sensing performance of the two sensors. Experimental results confirm that the resonance frequency of each antenna sensor increases in an approximately linear relationship with respect to compressive strain. The compressive strain sensing performance of the two RFID antenna sensors, including strain sensitivity and determination coefficient, is evaluated based on the experimental data.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Georgia Institute of Technology, School of Electrical and Computer Engineering, Virginia Tech
Contributors: Cho, C., Yi, X., Wang, Y., Tentzeris, M. M., Leon, R. T.
Publication date: 2014

Host publication information

Title of host publication: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2014
Volume: 9061
Publisher: SPIE
Article number: 90610X
ISBN (Print): 9780819499875
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Computer Science Applications, Applied Mathematics, Electrical and Electronic Engineering
Keywords: Folded patch antenna, Passive wireless sensor, RFID, Slotted patch antenna, Strain sensor
Source: Scopus
Source ID: 84902151393

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Crack propagation measurement using a battery-free slotted patch antenna sensor

This research studies the performance of a battery-free wireless antenna sensor for measuring crack propagation. In our previous work, a battery-free folded patch antenna was designed for wireless strain and crack sensing. When experiencing deformation, the antenna shape changes, causing shift in electromagnetic resonance frequency of the antenna. The wireless interrogation system utilizes the principle of electromagnetic backscattering and adopts off-the-shelf 900MHz radiofrequency identification (RFID) technology. Following the same sensing mechanism, a slotted patch antenna sensor of smaller size is designed. The antenna detours surface current using slot patterns, so that the effective electrical length is kept similar as previous folded patch antenna. As a result, the sensor footprint is reduced and the antenna resonance frequency is maintained within 900MHz RFID band. To validate the sensor performance for crack sensing, a fatigue crack experiment is conducted on a steel compact-tension specimen. A slotted patch antenna sensor is installed at the center of the A36 steel specimen. For wireless interrogation, a Yagi reader antenna is placed 36 in. away from the antenna sensor to wirelessly measure the resonance frequency shift of the antenna sensor. The measurement is taken after every 10,000 loading cycles, till the specimen fails. Meanwhile, the length and width of the fatigue crack are also recorded. Finally, the resonance frequency shift of the antenna sensor is correlated with crack length and width at each loading stage.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Georgia Institute of Technology, School of Electrical and Computer Engineering, Virginia Tech
Contributors: Yi, X., Cho, C., Wang, Y., Cook, B., Tentzeris, M. M., Leon, R. T.
Number of pages: 8
Pages: 1040-1047
Publication date: 2014

Host publication information

Title of host publication: 7th European Workshop on Structural Health Monitoring, EWSHM 2014 - 2nd European Conference of the Prognostics and Health Management (PHM) Society
Publisher: INRIA
ASJC Scopus subject areas: Civil and Structural Engineering, Safety, Risk, Reliability and Quality, Building and Construction, Computer Science Applications
Keywords: Battery-free sensor, Fatigue crack, RFID, Slotted patch antenna
Source: Scopus
Source ID: 84939455742

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Functional and genetic analysis of the colon cancer network.

Cancer is a complex disease that has proven to be difficult to understand on the single-gene level. For this reason a functional elucidation needs to take interactions among genes on a systems-level into account. In this study, we infer a colon cancer network from a large-scale gene expression data set by using the method BC3Net. We provide a structural and a functional analysis of this network and also connect its molecular interaction structure with the chromosomal locations of the genes enabling the definition of cis- and trans-interactions. Furthermore, we investigate the interaction of genes that can be found in close neighborhoods on the chromosomes to gain insight into regulatory mechanisms. To our knowledge this is the first study analyzing the genome-scale colon cancer network.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Queen’s University Belfast
Contributors: Emmert-Streib, F., de Matos Simoes, R., Glazko, G., McDade, S., Haibe-Kains, B., Holzinger, A., Dehmer, M., Campbell, F.
Publication date: 2014
Peer-reviewed: Yes

Publication information

Journal: BMC Bioinformatics
Volume: 15
Issue number: Suppl 6
Article number: S6
ISSN (Print): 1471-2105
Ratings: 
  • Scopus rating (2014): CiteScore 2.91 SJR 1.916 SNIP 1.185
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computer Science Applications, Applied Mathematics, Structural Biology

Research output: Contribution to journalArticleScientificpeer-review

Graph based representation and analyses for conceptual stages

What is the fundamental similarity between investing in stock of a company, because you like the products of this company, and selecting a design concept, because you have been impressed by the esthetic quality of the presentation made by the team developing the concept? Except that both decisions are based on a surface analysis of the situations, they both reflect a fundamental human's cognitive feature. Human brain is profoundly trying to minimize the efforts required to solve a cognitive task and is using when possible an automatic mode relying on recognition, memory, and causality. This mode is even used in some occasion without the engineer being conscious of it. Such type of tendencies are naturally pushing engineers to rush into known solutions, to avoid analyzing the context of a design problem, to avoid modelling design problems and to take decision based on isolated evidences. Those behaviors are familiar to experience teachers and engineers. This tendency is magnified by the time pressure imposed to the engineering design process. Early phases in particular have to be kept short despite the large impact of decisions taken at this stage. Few support tools are capable of supporting a deep analysis of the early design conditions and problems regarding the fuzziness and complexity of the early stage. The present article is hypothesizing that the natural ability of humans to deal with cause-effects relations push toward the massive usage of causal graphs analysis during the design process and specifically during the early phases. A global framework based on graphs is presented in this paper to efficiently support the early stages. The approach used to generate graphs, to analyze them and to support creativity based on the analysis is forming the central contribution of this paper.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Intelligent dexterity for secure networked infrastructure and applications (IDSNIA), Aalto University
Contributors: Coatanéa, E., Nonsiri, S., Christophe, F., Mokammel, F.
Publication date: 2014

Host publication information

Title of host publication: 34th Computers and Information in Engineering Conference
Volume: 1A
Publisher: The American Society of Mechanical Engineers ASME
ISBN (Electronic): 9780791846285
ASJC Scopus subject areas: Mechanical Engineering, Computer Graphics and Computer-Aided Design, Computer Science Applications, Modelling and Simulation
Source: Scopus
Source ID: 84961306932

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Maturity assessment for implementing and using product lifecycle management in project-oriented engineering companies

Product lifecycle management (PLM) is a systematic and holistic way to approach challenges that exist in managing product-related information along a product's lifecycle from product design to its disposal. There is an established set of information management approaches that address important subsets of lifecycle information management challenges, e.g., product data management (PDM), customer relationship management (CRM) and enterprise resource planning (ERP). A common characteristic of PLM is that implementation is a very challenging and complex long-term process, requiring changes in organisation, systems, conventions and importantly, skills and capabilities. The aim of this paper is to discuss the issue of PLM maturity assessment and its use and application in the specific industrial context of project-oriented engineering companies. Within this context, the empirical part of the paper studies the usefulness and tailoring needs of generic capability maturity assessment in implementing and facilitating PLM.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Information Management and Logistics, Research group: Novi, Augmented Human Activities (AHA), Managing digital industrial transformation (mDIT), Lappeenranta University of Technology
Contributors: Kärkkäinen, H., Myllärniemi, J., Okkonen, J., Silventoinen, A.
Number of pages: 23
Pages: 176-198
Publication date: 2014
Peer-reviewed: Yes

Publication information

Journal: International Journal of Electronic Business
Volume: 11
Issue number: 2
ISSN (Print): 1470-6067
Original language: English
ASJC Scopus subject areas: Business, Management and Accounting(all), Computer Science Applications
Keywords: Capability maturity assessment, Capability maturity model, CMM, Maturity models, PLM, Product lifecycle management, Project business
Source: Scopus
Source ID: 84946840351

Research output: Contribution to journalArticleScientificpeer-review

Mode coupling in few-mode large-mode-area fibers

We present an experimental study on mode coupling characteristics of few-mode large-mode-area (LMA) fibers, which are widely used in high power fiber lasers. The modal power allocation is measured by modal decomposition of the nearfield intensity profile of the output beam. Cut-back measurements are carried out with commonly-used fibers with different fiber geometries. The evolution of the modal power content due to mode coupling is presented. The influence of the fiber geometry on mode coupling is discussed.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Frontier Photonics, nLIGHT Corporation
Contributors: Ye, C., Koponen, J., Aallos, V., Petit, L., Kimmelma, O., Kokki, T.
Publication date: 2014

Host publication information

Title of host publication: Fiber Lasers XI: Technology, Systems, and Applications
Volume: 8961
Publisher: SPIE
Article number: 89612W
ISBN (Print): 9780819498748
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Beam quality, Few-mode, Large-mode-area fiber, Mode coupling, Mode decomposition, Silica optical fiber
Source: Scopus
Source ID: 84900835091

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Optical and topographic changes in water-responsive patterned cholesteric liquid crystalline polymer coatings

In this work, we present patterned water-responsive coatings, which alter both their topological and optical properties. The polymer coatings are based on a hydrogen-bonded cholesteric liquid crystalline polymer network. A two-step photopolymerization procedure leads to a patterned coating with repeating liquid crystalline and isotropic areas. The cholesteric liquid crystalline areas reflect green light, whilst the isotropic areas are transparent for visible light. Treatment with alkaline solution results in a hygroscopic polymer salt coating. When placed in demineralized water, the polymer films swells, leading to an enhancement of the surface topography structure in which the liquid crystalline areas swell more. Moreover, the pitch of the helical organization in the cholesteric areas increases due to this swelling leading to a color change from green to red.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Eindhoven University of Technology, School of Mathematical Sciences
Contributors: Stumpel, J. E., Broer, D. J., Bastiaansen, C. W. M., Schenning, A. P. H. J.
Publication date: 2014

Host publication information

Title of host publication: Proceedings of SPIE : Organic Photonics VI
Volume: 9137
Publisher: SPIE
Article number: 91370U
ISBN (Print): 9781628410853

Publication series

Name: Proceedings of SPIE: the International Society for Optical Engineering
Publisher: SPIE
ISSN (Print): 0277-786X
ISSN (Electronic): 1996-756X
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: cholesteric liquid crystals, patterned surfaces, responsive optical coatings, responsive surface topographies, water-responsive

Bibliographical note

EXT="Stumpel, Jelle"

Source: Scopus
Source ID: 84902324488

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Pulsed high-power yellow-orange VECSEL

We report on the development of a pulsed high-power frequency doubled vertical-external-cavity surface-emitting laser (VECSEL) with a peak output power of 14 W and emission spectrum near 588 nm. The semiconductor gain chip was grown by molecular beam epitaxy and comprised 10 GaInAs quantum wells. The gain structure was designed to be antiresonant at 1180 nm. The fundamental wavelength was frequency doubled to the yellow-orange spectral range using a 10-mm long critically phase matched lithium triborate nonlinear crystal, situated at the mode waist of the V-shaped laser cavity. The emission spectrum was narrowed down to FWHM of < 0.2 nm by employing a 1.5 mm birefringent filter and a 100-μm-thick etalon inside the cavity. By directly modulating the pump laser of the VECSEL, we were able to produce pulse widths down to 570 ns with average and peak output power of 81 mW and 14 W, respectively. The repetition rate was kept constant at 10 kHz throughout the measurements. The maximum peak power obtained was pump power limited. In comparison, at the same coolant temperature, a maximum of 8.5 W was achieved in continuous wave. The maximum optical-to-optical conversion efficiency (absorbed peak pump power to peak output power) was calculated to be 20-21 %. © 2014 SPIE.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Optoelectronics Research Centre, Research group: Semiconductor Technology and Applications, Frontier Photonics, Optoelectronics Research Centre, Tampere University of Technology
Contributors: Kantola, E., Leinonen, T., Ranta, S., Tavast, M., Guina, M.
Publication date: 2014

Host publication information

Title of host publication: Photonics Europe 2014, Semiconductor Lasers and Laser Dynamics VI, April 14-17, 2014, Brussels, Belgium. Proceedings of SPIE
Volume: 9134
Publisher: SPIE
Article number: 91340Z
ISBN (Print): 978-1-6284-1090-7

Publication series

Name: SPIE Conference Proceedings
Volume: 9134
ISSN (Print): 0277-786X
ISSN (Electronic): 1996-756X
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Frequency doubling, Gain modulation, High-efficiency, High-power, Pulsed, SHG, Yellow-orange VECSEL

Bibliographical note

Contribution: organisation=orc,FACT1=1<br/>Portfolio EDEND: 2014-08-31<br/>Publisher name: SPIE - International Society for Optical Engineering

Source: researchoutputwizard
Source ID: 654

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Transparency of intentions decreases privacy concerns in ubiquitous surveillance

An online experiment (n=1,897) was carried out to understand how data disclosure practices in ubiquitous surveillance affect users' privacy concerns. Information about the identity and intentions of a data collector was manipulated in hypothetical surveillance scenarios. Privacy concerns were found to differ across the scenarios and moderated by knowledge about the collector's identity and intentions. Knowledge about intentions exhibited a stronger effect. When no information about intentions was disclosed, the respondents postulated negative intentions. A positive effect was found for disclosing neutral intentions of an organization or unknown data collector, but not for a private data collector. The findings underline the importance of disclosing intentions of data use to users in an easily understandable manner.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematical modelling with wide societal impact (MathImpact), Cluster of Excellence on Multimodal Computing and Interaction, Saarland University, Aalto University, Helsinki Institute for Information Technology HIIT, Department of Information and Service Economy
Contributors: Oulasvirta, A., Suomalainen, T., Hamari, J., Lampinen, A., Karvonen, K.
Publication date: 2014
Peer-reviewed: Yes

Publication information

Journal: CYBERPSYCHOLOGY BEHAVIOR AND SOCIAL NETWORKING
Volume: 17
Issue number: 10
ISSN (Print): 2152-2715
Ratings: 
  • Scopus rating (2014): CiteScore 3.33 SJR 1.712 SNIP 1.819
Original language: English
ASJC Scopus subject areas: Human-Computer Interaction, Applied Psychology, Communication, Computer Science Applications, Social Psychology, Medicine(all)
Source: Scopus
Source ID: 84907285570

Research output: Contribution to journalArticleScientificpeer-review

The lord of the sense: A privacy preserving reputation system for participatory sensing applications

Electronic devices we use on a daily basis collect sensitive information without preserving user's privacy. In this paper, we propose the lord of the sense (LotS), a privacy preserving reputation system for participatory sensing applications. Our system maintains the privacy and anonymity of information with the use of cryptographic techniques and combines voting approaches to support users' reputation. Furthermore, LotS maintains accountability by tracing back a misbehaving user while maintaining k-anonymity. A detailed security analysis is presented with the current advantages and disadvantages of our system.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Security Lab, SICS, City University London
Contributors: Michalas, A., Komninos, N.
Publication date: 1 Jan 2014

Host publication information

Title of host publication: 2014 IEEE Symposium on Computers and Communications, ISCC 2014 - Proceedings
Publisher: Institute of Electrical and Electronics Engineers Inc.
Article number: 6912480
ISBN (Electronic): 9781479942787
ASJC Scopus subject areas: Software, Signal Processing, Mathematics(all), Computer Science Applications, Computer Networks and Communications
Keywords: Anonymity, Distributed Sensing, Participatory Sensing, Privacy, Reputation Systems, Security, Urban Sensing
Source: Scopus
Source ID: 84908199099

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Gene Sets Net Correlations Analysis (GSNCA): A multivariate differential coexpression test for gene sets

Motivation: To date, gene set analysis approaches primarily focus on identifying differentially expressed gene sets (pathways). Methods for identifying differentially coexpressed pathways also exist but are mostly based on aggregated pairwise correlations or other pairwise measures of coexpression. Instead, we propose Gene Sets Net Correlations Analysis (GSNCA), a multivariate differential coexpression test that accounts for the complete correlation structure between genes.Results: In GSNCA, weight factors are assigned to genes in proportion to the genes' cross-correlations (intergene correlations). The problem of finding the weight vectors is formulated as an eigenvector problem with a unique solution. GSNCA tests the null hypothesis that for a gene set there is no difference in the weight vectors of the genes between two conditions. In simulation studies and the analyses of experimental data, we demonstrate that GSNCA captures changes in the structure of genes' cross-correlations rather than differences in the averaged pairwise correlations. Thus, GSNCA infers differences in coexpression networks, however, bypassing method-dependent steps of network inference. As an additional result from GSNCA, we define hub genes as genes with the largest weights and show that these genes correspond frequently to major and specific pathway regulators, as well as to genes that are most affected by the biological difference between two conditions. In summary, GSNCA is a new approach for the analysis of differentially coexpressed pathways that also evaluates the importance of the genes in the pathways, thus providing unique information that may result in the generation of novel biological hypotheses.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), University of Arkansas for Medical Sciences, Computational Biology and Machine Learning, Queen's University, Belfast, Northern Ireland
Contributors: Rahmatallah, Y., Emmert-Streib, F., Glazko, G.
Number of pages: 9
Pages: 360-368
Publication date: 1 Feb 2014
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 30
Issue number: 3
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2014): CiteScore 5.5 SJR 4.171 SNIP 1.838
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability, Medicine(all)
Source: Scopus
Source ID: 84893275855

Research output: Contribution to journalArticleScientificpeer-review

Developing novel multimodal interaction techniques for touchscreen in-vehicle infotainment systems

Haptics has been an integral part of multimodal systems in Human Computer Interaction (HCI). The ability to touch and sense virtual components of any system has long been the holy grail of HCI, which is particularly useful in mission critical environments where other modalities are weakened by environmental noise. Haptics also compliments most modalities of interaction by reinforcing the intimate and personal aspect of interaction. Haptics becomes much more important in environments that prove to be far too noisy for audio feedback.The driving environment is one such area, which the addition of haptics is not just additive, but critical in HCI. However, most of the research on haptic feedback in the car has been conducted using vibro-tactile feedback. In this paper, we present a system in which we have developed a novel haptic feedback environment using pneumatic and vibrotactile technologies, to facilitate in carcommunication, using the In-vehicle Infotainment System. Our aim was to build on the user haptic perception and experience the advance multimodal interaction system by utilizing available feedback techniques in, in-car interaction. The qualitative results of our study show that haptic feedback has great potential for safety and communication use, but the difficulty in interpreting haptic signals requires additional translation means ('semantic linkages'), to support the right interpretation of the haptic information.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA)
Contributors: Farooq, A., Evreinov, G., Raisamo, R., Mäkinen, E., Nukarinen, T., Majeed, A. A.
Number of pages: 11
Pages: 32-42
Publication date: 2 Feb 2014

Host publication information

Title of host publication: ICOSST 2014 - 2014 International Conference on Open Source Systems and Technologies, Proceedings
Publisher: Institute of Electrical and Electronics Engineers Inc.
Article number: 7029317
ISBN (Electronic): 9781479920549
ASJC Scopus subject areas: Computer Science Applications, Software
Keywords: haptic feedback, human computer iteraction, In-Vehicle Infotainment Systems, Multimodal Interaction, pneumatic feedback, tactile/vibro-tactile feedback
Source: Scopus
Source ID: 84946688361

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Haptic user interface enhancement system for touchscreen based interaction: A novel system for multimodal interaction with touchscreen interfaces

Touchscreens are becoming a more attractive interaction technology in our daily lives and they are quickly replacing most of the conventional user interface controls. The ability to continuously modify and reconfigure screen contacts is a valuable feature in any device, especially in mobile devices like smartphones and tablets, where every inch matters. Perhaps the most inviting aspect of touchscreens is their ability to detect gestures and recognize human activities. Unlike externally static interfaces with a dedicated input device, such as a keypad with discrete well-defined keys; most touch sensitive displays are embodied as a flat, stiff and ridged screen surface. As a result, touch sensitive displays are breaking down and do not follow either ergonomic rules and standards nor physiological and psychological models/concepts of the afferent flow information processing. This, in turn, means that these systems diminish perceptual and intuitive haptic feedback which hinders and sometime limits user interaction.This paper defines a Haptic User Interface Enhancement System (UIES) that transforms the conventionally flat and stiff touchscreen surfaces intoa haptically adaptive interaction hub which is not only able to provide generic vibrotactile stimulation for conformational haptic feedback but is able to guide the user though onscreen User Interface controls via kinetic feedback cues which includes components of forces and torques applied dynamically in the place of contact to the fingertips.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA)
Contributors: Farooq, A., Evreinov, G., Raisamo, R., Majeed, A. A.
Number of pages: 7
Pages: 25-31
Publication date: 2 Feb 2014

Host publication information

Title of host publication: ICOSST 2014 - 2014 International Conference on Open Source Systems and Technologies, Proceedings
Publisher: Institute of Electrical and Electronics Engineers Inc.
Article number: 7029316
ISBN (Electronic): 9781479920549
ASJC Scopus subject areas: Computer Science Applications, Software
Keywords: Haptics, kenesthetic feedback, Multimodal Interaction, Touchscreen Interaction, Vibrotactile
Source: Scopus
Source ID: 84946686310

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

A computational approach to construct a multivariate complete graph invariant

In this paper, we present a computational approach for finding complete graph invariants. Specifically, we generate exhaustive sets of connected, non-isomorphic graphs with 9 and 10 vertices and demonstrate that a 97-dimensional multivariate graph invariant is capable to distinguish each of the non-isomorphic graphs. Furthermore, in order to tame the computational complexity of the problem caused by the vast number of graphs, e.g., involving over 10 million networks with 10 vertices, we suggest a low-dimensional, iterative procedure that is based on highly discriminative individual graph invariants. We show that also this computational approach leads to a perfect discrimination. Overall, our numerical results prove the existence of such graph invariants for networks with 9 and 10 vertices. Furthermore, we show that our iterative approach has a polynomial time complexity.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), 6060 Hall in Tyrol, Computational Biology and Machine Learning, Queen's University, Belfast, Northern Ireland
Contributors: Dehmer, M., Emmert-Streib, F., Grabner, M.
Number of pages: 9
Pages: 200-208
Publication date: 1 Mar 2014
Peer-reviewed: Yes

Publication information

Journal: Information Sciences
Volume: 260
ISSN (Print): 0020-0255
Ratings: 
  • Scopus rating (2014): CiteScore 5.47 SJR 2.226 SNIP 3.198
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Software, Control and Systems Engineering, Theoretical Computer Science, Computer Science Applications, Information Systems and Management
Keywords: Information inequality, Quantitative graph theory, Random network model, Statistics
Source: Scopus
Source ID: 84891738883

Research output: Contribution to journalArticleScientificpeer-review

Radar micro-Doppler feature extraction using the Singular Value Decomposition

The micro-Doppler spectrogram depends on parts of a target moving and rotating in addition to the main body motion (e.g., spinning rotor blades) and is thus characteristic for the type of target. In this study, the micro-Doppler spectrogram is exploited to distinguish between birds and small unmanned aerial vehicles (UAVs). The focus hereby is on micro-Doppler features enabling fast classification of birds and mini-UAVs. In a second classification step, it is desired to exploit micro-Doppler features to further characterize the type of UAV, e.g., fixed-wing vs. rotary-wing. In this paper, potentially robust features are discussed supporting the first classification step, i.e., separation of birds and UAVs. The Singular Value Decomposition seems a powerful tool to extract such features, since the information content of the micro-Doppler spectrogram is preserved in the singular vectors. In the paper, some examples of micro-Doppler feature extraction via Singular Value Decomposition are given.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, TNO, Thales Nederland B.V.
Contributors: De Wit, J. J. M., Harmanny, R. I. A., Molchanov, P.
Publication date: 12 Mar 2014

Host publication information

Title of host publication: 2014 International Radar Conference, Radar 2014
Publisher: The Institute of Electrical and Electronics Engineers, Inc.
ISBN (Print): 9781479941957
ASJC Scopus subject areas: Computer Science Applications, Computer Networks and Communications, Signal Processing, Electrical and Electronic Engineering
Keywords: classification, micro-Doppler signature, mini-UAVs, radar, singular value decomposition, time-frequency analysis
Source: Scopus
Source ID: 84946690619

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

System integration for real-time mobile manipulation

Mobile manipulators are one of the most complicated types of mechatronics systems. The performance of these robots in performing complex manipulation tasks is highly correlated with the synchronization and integration of their low-level components. This paper discusses in detail the mechatronics design of a four wheel steered mobile manipulator. It presents the manipulator's mechanical structure and electrical interfaces, designs low-level software architecture based on embedded PC-based controls, and proposes a systematic solution based on code generation products of MATLAB and Simulink. The remote development environment described here is used to develop real-time controller software and modules for the mobile manipulator under a POSIX-compliant, real-time Linux operating system. Our approach enables developers to reliably design controller modules that meet the hard real-time constraints of the entire low-level system architecture. Moreover, it provides a systematic framework for the development and integration of hardware devices with various communication mediums and protocols, which facilitates the development and integration process of the software controller. © 2014 The Author(s). Licensee InTech.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Tampere University of Technology, Department of Intelligent Hydraulics and Automation, Research group: Mobile manipulation, Research group: Field robotics and control, Field robotics for efficient work sites (FIRE)
Contributors: Oftadeh, R., Aref, M. M., Ghabcheloo, R., Mattila, J.
Publication date: 28 Mar 2014
Peer-reviewed: Yes

Publication information

Journal: international Journal of Advanced Robotic Systems
Volume: 11
Issue number: 1
Article number: 51
ISSN (Print): 1729-8806
Ratings: 
  • Scopus rating (2014): CiteScore 0.89 SJR 0.297 SNIP 0.76
Original language: English
ASJC Scopus subject areas: Software, Artificial Intelligence, Computer Science Applications
Keywords: Autonomous vehicles, Mechatronic design, Mobile manipulators, Real-time systems

Bibliographical note

Contribution: organisation=iha,FACT1=1<br/>Portfolio EDEND: 2014-05-30<br/>Publisher name: InTech Open Access Publisher

Source: researchoutputwizard
Source ID: 1179

Research output: Contribution to journalArticleScientificpeer-review

The emerging application ecosystems: An introductory analysis of android ecosystem

Emerging mobile application ecosystems have had a clear effect on the software business. Apple App Store and Google Play have gathered both existing large software companies and new start-ups. In creating a healthy ecosystem, the role of the software developer is significant. In practice, the ecosystems' ability to entice developers to create software products to the ecosystem can be argued to be a major factor driving the competitiveness of the ecosystem. This article empirically investigates Google Play, by gathering the data of 350,000 applications from the marketplace. With the dataset, common assumptions linked to the marketplace are studied. The results show that the direct software sale is a practical revenue model only for a few while offering a trial and paid version of the application seems to improve the revenue. The impact of the number of applications in the marketplace is questioned.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Managing digital industrial transformation (mDIT), University of Turku, Turku School of Economics, University of Turku, VTT Technical Research Centre of Finland
Contributors: Hyrynsalmi, S., Suominen, A., Mäkilä, T., Knuutila, T.
Number of pages: 21
Pages: 61-81
Publication date: 1 Apr 2014
Peer-reviewed: Yes

Publication information

Journal: INTERNATIONAL JOURNAL OF E-BUSINESS RESEARCH
Volume: 10
Issue number: 2
ISSN (Print): 1548-1131
Ratings: 
  • Scopus rating (2014): CiteScore 0.4 SJR 0.174 SNIP 0.218
Original language: English
ASJC Scopus subject areas: Management Information Systems, Computer Science Applications
Keywords: App economy, Application marketplace, Freemium, Google play, Mobile ecosystem
Source: Scopus
Source ID: 84928235907

Research output: Contribution to journalArticleScientificpeer-review

NetBioV: An R package for visualizing large network data in biology and medicine

NetBioV (Network Biology Visualization) is an R package that allows the visualization of large network data in biology and medicine. The purpose of NetBioV is to enable an organized and reproducible visualization of networks by emphasizing or highlighting specific structural properties that are of biological relevance.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Prostate cancer research center (PCRC), Queen's University, Belfast, Northern Ireland, Universität der Bundeswehr München, Computational Biology and Machine Learning
Contributors: Tripathi, S., Dehmer, M., Emmert-Streib, F.
Number of pages: 3
Pages: 2834-2836
Publication date: 2 Apr 2014
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 30
Issue number: 19
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2014): CiteScore 5.5 SJR 4.171 SNIP 1.838
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability, Medicine(all)
Source: Scopus
Source ID: 84911403383

Research output: Contribution to journalArticleScientificpeer-review

An enumeration-based model predictive control strategy for the cascaded H-bridge multilevel rectifier

In this paper, a model predictive control strategy is adapted to the cascaded H-bridge (CHB) multilevel rectifier. The proposed control scheme aims to keep the sinusoidal input current in phase with the supply voltage and to achieve independent voltage regulation of the H-bridge cells. To do so, the switches are directly manipulated without the need of a modulator. Furthermore, since all the possible switching combinations are taken into account, the controller exhibits favorable performance not only under nominal conditions but also under asymmetrical voltage potentials and unbalanced loads. Finally, a short horizon is employed in order to ensure robustness; this way, the required computational effort remains reasonable, making it possible to implement the algorithm in a real-time system. Experimental results obtained from a two-cell CHB rectifier are presented in order to demonstrate the performance of the proposed approach.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Smart Energy Systems (SES), Technische Universitat Munchen, ABB Oy, National Technical University of Athens
Contributors: Karamanakos, P., Pavlou, K., Manias, S.
Number of pages: 10
Pages: 3480-3489
Publication date: Jul 2014
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Industrial Electronics
Volume: 61
Issue number: 7
ISSN (Print): 0278-0046
Ratings: 
  • Scopus rating (2014): CiteScore 9.19 SJR 2.341 SNIP 4.549
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Control and Systems Engineering, Computer Science Applications
Keywords: Cascaded H-bridge (CHB) multilevel rectifier, model predictive control (MPC), optimal control
Source: Scopus
Source ID: 84894195338

Research output: Contribution to journalArticleScientificpeer-review

Analysis of a city-region from the knowledge perspective: Tampere, Finland

Purpose - The paper aims to evaluate the knowledge-based urban development (KBUD) dynamics of a rapidly emerging knowledge city-region, Tampere region, Finland. Design/methodology/approach - The paper empirically investigates Tampere region's development achievements and progress from the knowledge perspective. Findings - The research, through qualitative and quantitative analyses, reveals the regional development strengths, weaknesses, opportunities and threats of Tampere region. Originality/value - The paper provides useful suggestions based on the lessons learned from the Tampere case investigation that could shed light on the KBUD journey of city-regions.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Information Management and Logistics, Research group: Novi, Queensland University of Technology QUT, School of Management
Contributors: Yigitcanlar, T., Lönnqvist, A., Salonius, H.
Number of pages: 22
Pages: 445-466
Publication date: 5 Aug 2014
Peer-reviewed: Yes

Publication information

Journal: VINE
Volume: 44
Issue number: 3
ISSN (Print): 0305-5728
Ratings: 
  • Scopus rating (2014): CiteScore 0.89 SJR 0.243 SNIP 0.547
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Library and Information Sciences
Keywords: City-region, Finland, Knowledge-based urban development, Regional development, Tampere

Bibliographical note

EXT="Lönnqvist, Antti"

Source: Scopus
Source ID: 84908236523

Research output: Contribution to journalArticleScientificpeer-review

Adaptive sampling for compressed sensing based image compression

The compressed sensing (CS) theory shows that a sparse signal can be recovered at a sampling rate that is (much) lower than the required Nyquist rate. In practice, many image signals are sparse in a certain domain, and because of this, the CS theory has been successfully applied to the image compression in the past few years. The most popular CS-based image compression scheme is the block-based CS (BCS). In this paper, we focus on the design of an adaptive sampling mechanism for the BCS through a deep analysis of the statistical information of each image block. Specifically, this analysis will be carried out at the encoder side (which needs a few overhead bits) and the decoder side (which requires a feedback to the encoder side), respectively. Two corresponding solutions will be compared carefully in our work. We also present experimental results to show that our proposed adaptive method offers a remarkable quality improvement compared with the traditional BCS schemes.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: Video, Research Community on Data-to-Decision (D2D), Institute of Image Processing, University of Electronic Science and Technology of China
Contributors: Zhu, S., Zeng, B., Gabbouj, M.
Publication date: 3 Sep 2014

Host publication information

Title of host publication: 2014 IEEE International Conference on Multimedia and Expo (ICME), 14-18 July 2014, Chengdu
ISBN (Print): 9781479947607
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: adaptive CS sampling, compressed sensing (CS), image compression
Source: Scopus
Source ID: 84937510540

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Density functional theory study of transition metals doped B80 fullerene

Density functional theory calculations have been carried out to investigate 3d, Pd and Pt transition metal (TM) atoms exohedrally and endohedrally doped B80 fullerene. We find that the most preferred doping site of the TM atom gradually moves from the outer surface (TM = Sc), to the inner surface (TM = Ti and V) and the center (TM = Cr, Mn, Fe and Zn), then to the outer surface (TM = Co, Ni, Cu, Pd, and Pt) again with the TM atom varying from Sc to Pt. From the formation energy calculations, we find that doping TM atom can further improve the stability of B80 fullerene. The magnetic moments of doped V, Cr, Mn, Fe, Co and Ni atoms are reduced from their free-atom values and other TM atoms are completely quenched. Charge transfer and hybridization between 4s and 3d states of TM and 2s and 2p states of B were observed. The energy gaps of TM@B80 are usually smaller than that of the pure B80. Endohedrally doped B80 fullerene with two Mn and two Fe atoms were also considered, respectively. It is found that the antiferromagnetic (AFM) state is more energetically favorable than the ferromagnetic (FM) state for Mn2- and Fe2@B80. The Mn and Fe atoms carry the residual magnetic moments of ∼ 3 μB and 2 μB in the AFM states.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Computational Science X (CompX), National Key Laboratory of Photoelectric Technology and Functional Materials in Shaanxi Province, Northwest University China, Nanjing University
Contributors: Wang, J., Ma, L., Liang, Y., Gao, M., Wang, G.
Publication date: 22 Sep 2014
Peer-reviewed: Yes

Publication information

Journal: Journal of Theoretical and Computational Chemistry
Volume: 13
Issue number: 6
Article number: 1450050
ISSN (Print): 0219-6336
Ratings: 
  • Scopus rating (2014): CiteScore 0.48 SJR 0.22 SNIP 0.243
Original language: English
ASJC Scopus subject areas: Physical and Theoretical Chemistry, Computational Theory and Mathematics, Computer Science Applications
Keywords: B<inf>80</inf> fullerene, density functional theory, doped, Transition metal
Source: Scopus
Source ID: 84929575039

Research output: Contribution to journalArticleScientificpeer-review

Effect of feeder cable's phase tolerance on the first sidelobe level of base station antenna

The sidelobe level of a base station antenna is one of the important parameters to describe the performance of an antenna array. Given a required value of the sidelobe level, we can obtain a set of initial phases, and then further get a set of cable lengths. However, a tolerance (or error range) associated with manufacturing techniques will introduce an error in each cable length, thereby influencing the sidelobe level. This paper uses the knowledge of probability and mathematical statistics to make a statistical analysis for the reliability of the first sidelobe of the antenna array based on Monte Carlo simulations. We also obtain a distribution curve of reliabilities of the first sidelobe versus phase tolerances, which can bring great convenience for practical applications.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Shenzhen University
Contributors: He, Y., Pan, Z., Yang, J., Sun, G., Tentzeris, M. M.
Number of pages: 5
Pages: 1022-1026
Publication date: 22 Sep 2014

Host publication information

Title of host publication: IWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference
Publisher: Institute of Electrical and Electronics Engineers Inc.
Article number: 6906495
ISBN (Electronic): 9781479909599
ASJC Scopus subject areas: Computer Science Applications, Electrical and Electronic Engineering, Computer Networks and Communications
Keywords: first sidelobe, MATLAB, Monte Carlo, phase tolerance
Source: Scopus
Source ID: 84908637018

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Understanding social OER environments-A quantitative study on factors influencing the motivation to share and collaborate

Social software environments are increasingly used for open education: teachers and learners share and collaborate in these environments. While there are various possibilities for the inclusion of such social functionalities for OER, many organizational, individual and technological challenges can hinder the motivation of teachers to share and collaborate in these environments. Current research cannot explain what barriers teachers face in social OER environments and how those challenges influence their motivation to engage in such environments. An exploratory factor analysis was used in the context of schools and higher education institutions to investigate the possible barriers to engaging in social OER environments; a linear regression analysis was used to predict how the extracted factors influenced the motivation of teachers (N = 754) to share and collaborate. The findings allude to barriers within social OER environments; the main challenges relate to the lack of organizational support, language and culture as well as quality concerns. The key results depict how teachers' motivation to share and collaborate in these environments decreases when they perceive higher language and cultural barriers. These findings can support OER providers as well as educational institutions in their efforts to minimize those barriers.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Managing digital industrial transformation (mDIT), Jyväskylän yliopisto
Contributors: Pirkkalainen, H., Jokinen, J. P. P., Pawlowski, J. M.
Number of pages: 13
Pages: 388-400
Publication date: 1 Oct 2014
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Learning Technologies
Volume: 7
Issue number: 4
Article number: 6823168
ISSN (Print): 1939-1382
Ratings: 
  • Scopus rating (2014): CiteScore 2.42 SJR 0.768 SNIP 2.144
Original language: English
ASJC Scopus subject areas: Engineering(all), Computer Science Applications, Education
Keywords: knowledge management, knowledge sharing, Social technologies, user generated learning content
Source: Scopus
Source ID: 84919783368

Research output: Contribution to journalArticleScientificpeer-review

RF tag front-end design for uncompromised communication and harvesting

Typically, low-cost and low-power backscatter radio communicators utilize a switching mechanism for alternating the antenna load between two values. In this way, they achieve modulation by reflection of the RF waves induced at the communicator's antenna. For tags that employ a rectifier for wireless energy harvesting, a single transistor may switch between the matched harvester and a reflective load (an open or short). However, optimized backscatter communication occurs when switching between two reflective loads, ideally an open and a short. This prohibits the use of a harvester that requires a good matching (i.e. no reflections) and produces a tradeoff of either compromising communication performance or not employing a harvester. Although this may not pose a problem for commodity RFID tags that operate in short ranges and do not require high computational ability, it is a strong limitation for applications like wireless sensor networks that employ backscatter radio as a low-cost and low-power communication scheme. In this work, an RF front-end is designed, analyzed, and implemented, that overcomes the limitation of compromising communication performance when employing a harvester.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology
Contributors: Kimionis, J., Tentzeris, M. M.
Number of pages: 6
Pages: 109-114
Publication date: 22 Oct 2014

Host publication information

Title of host publication: 2014 IEEE RFID Technology and Applications Conference, RFID-TA 2014
Publisher: Institute of Electrical and Electronics Engineers Inc.
Article number: 6934210
ISBN (Electronic): 9781479946808
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications, Electrical and Electronic Engineering
Keywords: backscatter radio, communication, harvesting, RFID, tag design
Source: Scopus
Source ID: 84912130713

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

On computation of calcium cycling anomalies in cardiomyocytes data

Induced pluripotent stem cell (iPSC) lines derived from skin fibroblasts of patients suffering from cardiac disorders were differentiated to cardiomyocytes and used to generate a data set of Ca2+ transients of 136 recordings. The objective was to separate normal signals for later medical research from abnormal signals. We constructed a signal analysis procedure to detect peaks representing calcium cycling in signals and another procedure to classify them into either normal or abnormal peaks. Using machine learning methods we classified signals into normal or abnormal signals on the basis of peak findings in them. We compared classification results obtained to those made visually by an expert biotechnologist who assessed the signals independent of the computer method. Classification accuracies of around 85% indicated high congruence between two modes denoting the high capability and usefulness of computer based processing for the present data.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: BioMediTech, Augmented Human Activities (AHA), Integrated Technologies for Tissue Engineering Research (ITTE)
Contributors: Juhola, M., Joutsijoki, H., Varpa, K., Saarikoski, J., Rasku, J., Iltanen, K., Laurikkala, J., Hyyro, H., Avalos-Salguero, J., Siirtola, H., Penttinen, K., Aalto-Setala, K.
Number of pages: 4
Pages: 1444-1447
Publication date: 2 Nov 2014

Host publication information

Title of host publication: 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2014
Publisher: Institute of Electrical and Electronics Engineers Inc.
Article number: 6943872
ISBN (Electronic): 9781424479290
ASJC Scopus subject areas: Health Informatics, Computer Science Applications, Biomedical Engineering
Keywords: Calcium cycling, cardiomyocytes, classification, signal analysis
Source: Scopus
Source ID: 84929461388

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Body-touching: An embodied interaction technique for health information systems in developing regions

We present a study of using embodied health information system for developing regions focusing on users not familiar with technology. We designed and developed a health information system with two gesture-based selection techniques: pointing to a screen and touching one's own body part. We evaluated the prototype in user study with 37 semi-literate and literate participants. Our results indicate a clear preference (76%) for touching in the healthcare domain. Based on our observations and user feedback, we present four design guidelines for developing embodied systems for the developing world: designing bodycentric interaction to overcome literacy and technological proficiency barriers, addressing the misconceptions of system behaviors with users not familiar with technology, understanding effects of cultural constraints on interaction, and utilizing interactive virtual avatars to connect with the users.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA), IBM Research, Indian Institute of Technology
Contributors: Sharma, S., Srivastava, S., Sorathia, K., Hakulinen, J., Heimonen, T., Turunen, M., Rajput, N.
Number of pages: 8
Pages: 49-56
Publication date: 4 Nov 2014

Host publication information

Title of host publication: MINDTREK 2014 - Proceedings of the 18th International Academic MindTrek Conference: "Media Business, Management, Content and Services"
Publisher: Association for Computing Machinery, Inc
ISBN (Electronic): 9781450330060
ASJC Scopus subject areas: Computer Science Applications, Human-Computer Interaction, Software
Keywords: Body-centric interaction, Embodied interaction, gesture-based interaction, HCI4D, Health information systems, Information access
Source: Scopus
Source ID: 84964053943

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

DYNAMO sound engine - Exploring the aesthetics of dynamic sound interactions

This paper outlines the design and development process of the Dynamic Audio Motion (Dynamo) concept. The Dynamo audio engine was developed for driving dynamic sound interaction states via custom made finite state machine. Further, a generative sound design approach was employed for creating sonic and musical structures. Designed dynamic sound interactions were tested in an embodied information wall application with endusers. During the testing situation, end-users engaged in a reflective creation process providing valuable insight of their experiences of using the system. In this paper we present key questions driving the research, theoretical background, research approach, an audio engine development process, and end-user research activities. The results indicate that dynamic sound interactions supported people's personal, emotional, and creative needs in the design context.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA)
Contributors: Luhtala, M., Heimonen, T., Mäkelä, V., Keskinen, T., Turunen, M., Saarinen, S.
Number of pages: 8
Pages: 159-166
Publication date: 4 Nov 2014

Host publication information

Title of host publication: MINDTREK 2014 - Proceedings of the 18th International Academic MindTrek Conference: "Media Business, Management, Content and Services"
Publisher: Association for Computing Machinery, Inc
ISBN (Electronic): 9781450330060
ASJC Scopus subject areas: Computer Science Applications, Human-Computer Interaction, Software
Keywords: Aesthetic experience, Artistic interfaces, Dynamic sound interaction, Multimodal interaction, Musicalization, Procedural sound design, Sonic interaction design
Source: Scopus
Source ID: 84963995207

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Email intensity, productivity and control in the knowledge worker's performance on the desktop

Experiencing stress, disturbing interruptions, loss of ability to concentrate, hurry and challenges to meet tight deadlines at work are very common in working life. At the same time, while variety of digital communication channels like instant messaging, video calls and social networking sites are getting more popular in working life, email is still intensively utilized work communication media. The goal of the empirical field study analyzing daily desktop computing of knowledge workers was to analyze association between email intensity in work time spending and subjectively experienced quality of work performance. It was found that while intensive email use does not impair subjectively experienced productivity, it may harm ability to concentrate, may increase forgetfulness and inability to solve problems at work effectively. Copyright is held by the owner/author(s). Publication rights licensed to ACM.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA), University of Tampere
Contributors: Franssila, H., Okkonen, J., Savolainen, R.
Number of pages: 4
Pages: 19-22
Publication date: 4 Nov 2014

Host publication information

Title of host publication: MINDTREK 2014 - Proceedings of the 18th International Academic MindTrek Conference: "Media Business, Management, Content and Services"
Publisher: Association for Computing Machinery, Inc
ISBN (Electronic): 9781450330060
ASJC Scopus subject areas: Computer Science Applications, Human-Computer Interaction, Software
Keywords: Email intensity, Knowledge work, Measurement, Productivity, Work performance
Source: Scopus
Source ID: 84964078815

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Games and energy: Profiling power usage during play

Computer gaming is a globally growing industry, with hundreds of millions of gaming-capable computers consuming an ever increasing amount of energy. Several of the world's most popular computer games tend to make a heavy use of computers' central processing units and/or graphics processing units. When such games execute on typical computers, for much of the time those components are kept in high energy-consuming states, regardless of what is happening in the game. We analyze this pattern of energy usage and we assess the scope for economizing on energy. The results presented also give insight into the energy implications of the hardware platform and operating systems used for hosting such games. We use the results to provide practical suggestions to both the industry and the gamers. Copyright is held by the owner/author(s). Publication rights licensed to ACM.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Mathematical modelling with wide societal impact (MathImpact), European Organization for Nuclear Research
Contributors: Salmela, J. M., Thanisch, P., Sotamaa, O., Niemi, T.
Number of pages: 8
Pages: 192-199
Publication date: 4 Nov 2014

Host publication information

Title of host publication: MINDTREK 2014 - Proceedings of the 18th International Academic MindTrek Conference: "Media Business, Management, Content and Services"
Publisher: Association for Computing Machinery, Inc
ISBN (Electronic): 9781450330060
ASJC Scopus subject areas: Computer Science Applications, Human-Computer Interaction, Software
Keywords: Computer games, Energy measurement
Source: Scopus
Source ID: 84963995284

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

MurMur Moderators, the talking playful seats

In this article we present the concept of MurMur Moderators, talking playful seats facilitating playful atmosphere and creativity at office environments. The article describes the design and technological composition of our first prototype, and our experiences exposing the concept to audiences at two science fairs in Italy (2013) and Finland (2014). This research has served as an informative pilot study, consequently directing our focus to the ways the accompanying narrative brings additional design value to the interactive seats. Our goal with the fairs was to investigate what are the preliminary audience reactions for the high level concept and how people interact with the initial prototype. The feedback was used for generating further ideas for ambient play and furniture-as-a-service, some of which carries on to future research and second prototype of the seat.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Mathematical modelling with wide societal impact (MathImpact)
Contributors: Nummenmaa, T., Kultima, A., Tyni, H., Alha, K.
Number of pages: 7
Pages: 231-237
Publication date: 4 Nov 2014

Host publication information

Title of host publication: MINDTREK 2014 - Proceedings of the 18th International Academic MindTrek Conference: "Media Business, Management, Content and Services"
Publisher: Association for Computing Machinery, Inc
ISBN (Electronic): 9781450330060
ASJC Scopus subject areas: Computer Science Applications, Human-Computer Interaction, Software
Keywords: Arduino, Audio feedback, Design research, Diy, Game studies, Internet of things, Playful furniture, Raspberry pi
Source: Scopus
Source ID: 84964027379

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Comparative evaluation of gene set analysis approaches for RNA-Seq data

Background: Over the last few years transcriptome sequencing (RNA-Seq) has almost completely taken over microarrays for high-throughput studies of gene expression. Currently, the most popular use of RNA-Seq is to identify genes which are differentially expressed between two or more conditions. Despite the importance of Gene Set Analysis (GSA) in the interpretation of the results from RNA-Seq experiments, the limitations of GSA methods developed for microarrays in the context of RNA-Seq data are not well understood. Results: We provide a thorough evaluation of popular multivariate and gene-level self-contained GSA approaches on simulated and real RNA-Seq data. The multivariate approach employs multivariate non-parametric tests combined with popular normalizations for RNA-Seq data. The gene-level approach utilizes univariate tests designed for the analysis of RNA-Seq data to find gene-specific -values and combines them into a pathway -value using classical statistical techniques. Our results demonstrate that the Type I error rate and the power of multivariate tests depend only on the test statistics and are insensitive to the different normalizations. In general standard multivariate GSA tests detect pathways that do not have any bias in terms of pathways size, percentage of differentially expressed genes, or average gene length in a pathway. In contrast the Type I error rate and the power of gene-level GSA tests are heavily affected by the methods for combining -values, and all aforementioned biases are present in detected pathways. Conclusions: Our result emphasizes the importance of using self-contained non-parametric multivariate tests for detecting differentially expressed pathways for RNA-Seq data and warns against applying gene-level GSA tests, especially because of their high level of Type I error rates for both, simulated and real data.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), University of Arkansas for Medical Sciences, Computational Biology and Machine Learning, Queen's University, Belfast, Northern Ireland
Contributors: Rahmatallah, Y., Emmert-Streib, F., Glazko, G.
Publication date: 5 Dec 2014
Peer-reviewed: Yes

Publication information

Journal: BMC Bioinformatics
Volume: 15
Issue number: 1
Article number: 397
ISSN (Print): 1471-2105
Ratings: 
  • Scopus rating (2014): CiteScore 2.91 SJR 1.916 SNIP 1.185
Original language: English
ASJC Scopus subject areas: Applied Mathematics, Structural Biology, Biochemistry, Molecular Biology, Computer Science Applications
Source: Scopus
Source ID: 84923922737

Research output: Contribution to journalArticleScientificpeer-review

Regularized extreme learning machine for multi-view semi-supervised action recognition

In this paper, three novel classification algorithms aiming at (semi-)supervised action classification are proposed. Inspired by the effectiveness of discriminant subspace learning techniques and the fast and efficient Extreme Learning Machine (ELM) algorithm for Single-hidden Layer Feedforward Neural networks training, the ELM algorithm is extended by incorporating discrimination criteria in its optimization process, in order to enhance its classification performance. The proposed Discriminant ELM algorithm is extended, by incorporating proper regularization in its optimization process, in order to exploit information appearing in both labeled and unlabeled action instances. An iterative optimization scheme is proposed in order to address multi-view action classification. The proposed classification algorithms are evaluated on three publicly available action recognition databases providing state-of-the-art performance in all the cases.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Number of pages: 13
Pages: 250-262
Publication date: 5 Dec 2014
Peer-reviewed: Yes

Publication information

Journal: Neurocomputing
Volume: 145
ISSN (Print): 0925-2312
Ratings: 
  • Scopus rating (2014): CiteScore 2.99 SJR 0.875 SNIP 1.717
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Computer Science Applications, Cognitive Neuroscience
Keywords: Extreme learning machine, Multi-view learning, Semi-supervised learning
Source: Scopus
Source ID: 84906935799

Research output: Contribution to journalArticleScientificpeer-review

Class-Specific Reference Discriminant Analysis With Application in Human Behavior Analysis

In this paper, a novel nonlinear subspace learning technique for class-specific data representation is proposed. A novel data representation is obtained by applying nonlinear class-specific data projection to a discriminant feature space, where the data belonging to the class under consideration are enforced to be close to their class representation, while the data belonging to the remaining classes are enforced to be as far as possible from it. A class is represented by an optimized class vector, enhancing class discrimination in the resulting feature space. An iterative optimization scheme is proposed to this end, where both the optimal nonlinear data projection and the optimal class representation are determined in each optimization step. The proposed approach is tested on three problems relating to human behavior analysis: Face recognition, facial expression recognition, and human action recognition. Experimental results denote the effectiveness of the proposed approach, since the proposed class-specific reference discriminant analysis outperforms kernel discriminant analysis, kernel spectral regression, and class-specific kernel discriminant analysis, as well as support vector machine-based classification, in most cases.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Pages: 315-326
Publication date: 25 Dec 2014
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Human-Machine Systems
Volume: 45
Issue number: 3
ISSN (Print): 2168-2291
Ratings: 
  • Scopus rating (2014): CiteScore 2.98 SJR 1.28 SNIP 3.04
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Signal Processing, Human Factors and Ergonomics, Computer Networks and Communications, Computer Science Applications, Human-Computer Interaction, Control and Systems Engineering

Research output: Contribution to journalArticleScientificpeer-review

1180nm VECSEL with 50 W output power

We report on the development of a high-power vertical-external-cavity surface-emitting laser (VECSEL) emitting around 1180 nm. The laser emitted 50 W of output power when the mount of the gain chip was cooled to -15°C. The output power was measured using a 97% reflective cavity end-mirror. The VECSEL was arranged to form an I-shaped cavity with a length of ∼100 mm; the gain chip and a curved dielectric mirror (RoC=150) acting as cavity end mirrors. The gain chip was grown by molecular beam epitaxy (MBE) and incorporated 10 GaInAs/GaAs quantum wells. For efficient heat extraction, the chip was capillary bonded to a diamond heat spreader which was attached to a TEC-cooled copper mount. The maximum optical-to-optical conversion efficiency of 28% was achieved for 42 W of output power and -15°C mount temperature.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Optoelectronics Research Centre, Research group: Semiconductor Technology and Applications, Frontier Photonics
Contributors: Kantola, E., Leinonen, T., Ranta, S., Tavast, M., Penttinen, J., Guina, M.
Publication date: 2015

Host publication information

Title of host publication: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 9349
Publisher: SPIE
Article number: 93490U
ISBN (Print): 9781628414394
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: continuous wave, frequency doubling, heat management, high power, infrared, power scaling, SDL, VECSEL
Source: Scopus
Source ID: 84925666801

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

A method for predicting DCT-based denoising efficiency for grayscale images corrupted by AWGN and additive spatially correlated noise

Results of denoising based on discrete cosine transform for a wide class of images corrupted by additive noise are obtained. Three types of noise are analyzed: additive white Gaussian noise and additive spatially correlated Gaussian noise with middle and high correlation levels. TID2013 image database and some additional images are taken as test images. Conventional DCT filter and BM3D are used as denoising techniques. Denoising efficiency is described by PSNR and PSNR-HVS-M metrics. Within hard-thresholding denoising mechanism, DCT-spectrum coefficient statistics are used to characterize images and, subsequently, denoising efficiency for them. Results of denoising efficiency are fitted for such statistics and efficient approximations are obtained. It is shown that the obtained approximations provide high accuracy of prediction of denoising efficiency.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: Computational Imaging-CI, Signal Processing Research Community (SPRC), National Aerospace University
Contributors: Rubel, A. S., Lukin, V. V., Egiazarian, K.
Publication date: 2015

Host publication information

Title of host publication: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 9399
Publisher: SPIE
Article number: 93990P
ISBN (Print): 9781628414899
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: DCT and BM3D filter, Denoising, Fitting, Grayscale images, Prediction
Source: Scopus
Source ID: 84928473717

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

A perceptual quality metric for high-definition stereoscopic 3D video

The use of 3D video is growing in several fields such as entertainment, military simulations, medical applications. However, the process of recording, transmitting, and processing 3D video is prone to errors thus producing artifacts that may affect the perceived quality. Nowadays a challenging task is the definition of a new metric able to predict the perceived quality with low computational complexity in order to be used in real-time applications. The research in this field is very active due to the complexity of the analysis of the influence of stereoscopic cues. In this paper we present a novel stereoscopic metric based on the combination of relevant features able to predict the subjective quality rating in a more accurate way.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: 3D MEDIA, Signal Processing Research Community (SPRC), Universita' degli Studi Roma TRE
Contributors: Battisti, F., Carli, M., Stramacci, A., Boev, A., Gotchev, A.
Publication date: 2015

Host publication information

Title of host publication: Image Processing: Algorithms and Systems XIII
Publisher: SPIE
Article number: 939916
ISBN (Print): 9781628414899

Publication series

Name: SPIE Conference Proceedings
Volume: 9399
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Quality metric, Stereoscopic 3D video, Video transmission
Electronic versions: 
Source: Scopus
Source ID: 84928485494

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Busting myths of electronic word of mouth: The relationship between customer ratings and the sales of mobile applications

Business and academic research frequently highlights the power of electronic word of mouth, relying on the knowledge that online customer ratings and reviews influence consumer decision making. Numerous studies in different disciplines have been conducted to examine the effectiveness of electronic word of mouth communication. Previously, typically small sample studies suggest that positive electronic word of mouth increases sales and that the effects depend on the volume and valence of reviews and ratings. This study’s contribution lies in testing the relationship between electronic word of mouth and the sales of applications in a mobile application ecosystem (Google Play) with an extensive dataset (over 260 million customer ratings; 18 months). The results show that higher values of valence of customer ratings correlate statistically significantly with higher sales. The volume of ratings correlates positively with sales in the long term but negatively in the short term. Furthermore, the relationship between electronic word of mouth and sales seems to be more important when the price of the application increases. The findings also underline the importance of the choice of a measurement period in studies.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Managing digital industrial transformation (mDIT), Pori Department, Research group: Business Ecosystems, Networks and Innovations, Turun Yliopisto/Turun Biomateriaalikeskus, University of Turku, Turku School of Economics, VTT Technical Research Centre of Finland, University of Turku
Contributors: Hyrynsalmi, S., Seppänen, M., Aarikka-Stenroos, L., Suominen, A., Järveläinen, J., Harkke, V.
Number of pages: 18
Pages: 1-18
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Journal of Theoretical and Applied Electronic Commerce Research
Volume: 10
Issue number: 2
ISSN (Print): 0718-1876
Ratings: 
  • Scopus rating (2015): CiteScore 1.84 SJR 0.749 SNIP 1.398
Original language: English
ASJC Scopus subject areas: Business, Management and Accounting(all), Computer Science Applications
Keywords: App stores, Big data, Consumer ratings, Consumer reviews, Electronic word of mouth, Micro-pricing, Products ratings, Sales

Bibliographical note

EXT="Aarikka-Stenroos, Leena"
EXT="Hyrynsalmi, Sami"

Versio ja lupa ok 12.1.2016, lupa annettu lomakkeella KK

Source: Scopus
Source ID: 84930678533

Research output: Contribution to journalArticleScientificpeer-review

Combining full-reference image visual quality metrics by neural network

A task of assessing full-reference visual quality of images is considered. Correlation between the obtained array of mean opinion scores (MOS) and the corresponding array of given metric values allows characterizing correspondence of a considered metric to HVS. For the largest openly available database TID2013 intended for metric verification, a Spearman correlation is about 0.85 for the best existing HVS-metrics. One simple way to improve an efficiency of assessing visual quality of images is to combine several metrics. Our work addresses a possibility of using neural networks for the aforementioned purpose. As leaning data, we have used metric sets for images of the database TID2013 that are employed as the network inputs. Randomly selected half of 3000 images of the database TID2013 has been used at the learning stage whilst other half have been exploited for assessing quality of neural network based HVS-metric. Six metrics "cover" well all types of distortions: FSIMc, PSNR-HMA, PSNR-HVS, SFF, SR-SIM, and VIF, have been selected. As the result of NN learning, the Spearman correlation between the NN output and the MOS for the verification set of database TID2013 reaches 0.93 for the best configuration of NN. This is considerably better than for any particular metric employed as an input (FSIMc is the best among them). Analysis of the designed metric efficiency is carried out, its advantages and drawbacks are demonstrated.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Signal Processing Research Community (SPRC), National Aerospace University
Contributors: Lukin, V. V., Ponomarenko, N. N., Ieremeiev, O., Egiazarian, K., Astola, J.
Publication date: 2015

Host publication information

Title of host publication: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 9394
Publisher: SPIE
Article number: 93940K
ISBN (Print): 9781628414844
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Full-reference image visual quality assessment, Neural networks
Source: Scopus
Source ID: 84928473490

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Depth map occlusion filling and scene reconstruction using modified exemplar-based inpainting

RGB-D sensors are relatively inexpensive and are commercially available off-the-shelf. However, owing to their low complexity, there are several artifacts that one encounters in the depth map like holes, mis-alignment between the depth and color image and lack of sharp object boundaries in the depth map. Depth map generated by Kinect cameras also contain a significant amount of missing pixels and strong noise, limiting their usability in many computer vision applications. In this paper, we present an efficient hole filling and damaged region restoration method that improves the quality of the depth maps obtained with the Microsoft Kinect device. The proposed approach is based on a modified exemplar-based inpainting and LPA-ICI filtering by exploiting the correlation between color and depth values in local image neighborhoods. As a result, edges of the objects are sharpened and aligned with the objects in the color image. Several examples considered in this paper show the effectiveness of the proposed approach for large holes removal as well as recovery of small regions on several test images of depth maps. We perform a comparative study and show that statistically, the proposed algorithm delivers superior quality results compared to existing algorithms.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: Computational Imaging-CI, Signal Processing Research Community (SPRC), Dept. of Radio-Electronics Systems, Don State Technical University
Contributors: Voronin, V. V., Marchuk, V. I., Fisunov, A. V., Tokareva, S. V., Egiazarian, K. O.
Publication date: 2015

Host publication information

Title of host publication: Image Processing: Algorithms and Systems XIII
Publisher: SPIE
Article number: 93990S
ISBN (Print): 9781628414899

Publication series

Name: SPIE Conference Proceedings
Volume: 9399
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Depth map, Filtering, Image processing, Inpainting, Kinect, Occlusion
Source: Scopus
Source ID: 84928473063

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Distant speech separation using predicted time-frequency masks from spatial features

Speech separation algorithms are faced with a difficult task of producing high degree of separation without containing unwanted artifacts. The time-frequency (T-F) masking technique applies a real-valued (or binary) mask on top of the signal's spectrum to filter out unwanted components. The practical difficulty lies in the mask estimation. Often, using efficient masks engineered for separation performance leads to presence of unwanted musical noise artifacts in the separated signal. This lowers the perceptual quality and intelligibility of the output. Microphone arrays have been long studied for processing of distant speech. This work uses a feed-forward neural network for mapping microphone array's spatial features into a T-F mask. Wiener filter is used as a desired mask for training the neural network using speech examples in simulated setting. The T-F masks predicted by the neural network are combined to obtain an enhanced separation mask that exploits the information regarding interference between all sources. The final mask is applied to the delay-and-sum beamformer (DSB) output. The algorithm's objective separation capability in conjunction with the separated speech intelligibility is tested with recorded speech from distant talkers in two rooms from two distances. The results show improvement in instrumental measure for intelligibility and frequency-weighted SNR over complex-valued non-negative matrix factorization (CNMF) source separation approach, spatial sound source separation, and conventional beamforming methods such as the DSB and minimum variance distortionless response (MVDR).

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Research group: Audio research group
Contributors: Pertilä, P., Nikunen, J.
Number of pages: 10
Pages: 97-106
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Speech Communication
Volume: 68
ISSN (Print): 0167-6393
Ratings: 
  • Scopus rating (2015): CiteScore 2.21 SJR 0.49 SNIP 1.612
Original language: English
ASJC Scopus subject areas: Modelling and Simulation, Computer Science Applications, Computer Vision and Pattern Recognition, Software, Communication, Linguistics and Language, Language and Linguistics
Keywords: Beamforming, Microphone arrays, Neural networks, Speech separation, Time-frequency masking
Source: Scopus
Source ID: 84923277715

Research output: Contribution to journalArticleScientificpeer-review

Extreme learning machine based supervised subspace learning

This paper proposes a novel method for supervised subspace learning based on Single-hidden Layer Feedforward Neural networks. The proposed method calculates appropriate network target vectors by formulating a Bayesian model exploiting both the labeling information available for the training data and geometric properties of the training data, when represented in the feature space determined by the network's hidden layer outputs. After the calculation of the network target vectors, Extreme Learning Machine-based neural network training is applied and classification is performed using a Nearest Neighbor classifier. Experimental results on publicly available data sets show that the proposed approach consistently outperforms the standard ELM approach, as well as other standard methods.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Research Community on Data-to-Decision (D2D)
Contributors: Iosifidis, A.
Number of pages: 7
Pages: 158–164
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Neurocomputing
Volume: 167
ISSN (Print): 0925-2312
Ratings: 
  • Scopus rating (2015): CiteScore 3.18 SJR 0.981 SNIP 1.698
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Computer Science Applications, Cognitive Neuroscience
Keywords: Extreme Learning Machine, Network targets calculation, Supervised subspace learning

Research output: Contribution to journalArticleScientificpeer-review

Green (In,Ga,Al)P-GaP light-emitting diodes grown on high-index GaAs surfaces

We report on green (550-560 nm) electroluminescence (EL) from (Al<inf>0.5</inf>Ga<inf>0.5</inf>)<inf>0.5</inf>In<inf>0.5</inf>P-(Al<inf>0.8</inf>Ga<inf>0.2</inf>)<inf>0.5</inf>In<inf>0.5</inf>P double p-i-n heterostructures with monolayer-scale tensile strained GaP insertions in the cladding layers and light-emitting diodes (LEDs) based thereupon. The structures are grown side-by-side on high-index and (100) GaAs substrates by molecular beam epitaxy. Cross-sectional transmission electron microscopy studies indicate that GaP insertions are flat, thus the GaP-barrier substrate orientation-dependent heights should match the predictions of the flat model. At moderate current densities (∼500 A/cm<sup>2</sup>) the EL intensity of the structures is comparable for all substrate orientations. Opposite to the (100)-grown strictures, the EL spectra of (211) and (311)-grown devices are shifted towards shorter wavelengths (∼550 nm at room temperature). At high current densities (>1 kA/cm<sup>2</sup>) a much higher EL intensity is achieved for the devices grown on high-index substrates. The integrated intensity of (311)-grown structures gradually saturates at current densities above 4 kA/cm<sup>2</sup>, whereas no saturation is revealed for (211)-grown structures up to the current densities above 14 kA/cm<sup>2</sup>. We attribute the effect to the surface orientation-dependent engineering of the GaP band structure which prevents the escape of the nonequilibrium electrons into the indirect conduction band minima of the p- doped (Al<inf>0.8</inf>Ga<inf>0.2</inf>)<inf>0.5</inf>In<inf>0.5</inf>P cladding layers.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Optoelectronics Research Centre, Research group: Ultrafast and intense lasers, Frontier Photonics, Technische Universität Berlin, Fakultät VII-Wirtschaft und Management, 25.6.2012, VI Systems GmbH, CEMES-CNRS, A. F. Ioffe Physical Technical Institute, Institut Für Festkörperphysik
Contributors: Ledentsov, N. N., Shchukin, V. A., Lyytikäinen, J., Okhotnikov, O., Cherkashin, N. A., Shernyakov, Y. M., Payusov, A. S., Gordeev, N. Y., Maximov, M. V., Schlichting, S., Nippert, F., Hoffmann, A.
Publication date: 2015

Host publication information

Title of host publication: Proceedings of SPIE : Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XIX
Volume: 9383
Publisher: SPIE
Article number: 93830E
ISBN (Print): 9781628414738
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: high-index surface, light-emitting diode, tensile strained barrier
Source: Scopus
Source ID: 84930074847

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

>8W GaInNAs VECSEL emitting at 615 nm

We report a high-power VECSEL emitting <8W around 615 nm. The gain chip of the laser was grown by plasmaassisted molecular beam epitaxy and it comprised 10 GaInNAs quantum wells. The VECSEL cavity had a V-shaped geometry and a 10-mm-long non-critically phase-matched LBO crystal for second harmonic generation. The cavity incorporated also an etalon and a birefringent filter for controlling the output wavelength. With the aid of the secondharmonic output and the infrared light leaking out from the laser cavity, the single-pass conversion efficiency of the crystal was estimated to have a value of 0.75%.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Optoelectronics Research Centre, Research group: Semiconductor Technology and Applications, Frontier Photonics
Contributors: Leinonen, T., Penttinen, J. P., Korpijärvi, V. M., Kantola, E., Guina, M.
Publication date: 2015

Host publication information

Title of host publication: Proceedings of SPIE : Vertical External Cavity Surface Emitting Lasers (VECSELs) V
Volume: 9349
Publisher: SPIE
Article number: 934909
ISBN (Print): 9781628414394
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: frequency doubling, high power visible laser, OPSL, orange-red VECSEL, SDL, SHG
Source: Scopus
Source ID: 84925597620

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Idea-space: A use case of collaborative course development in higher education

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Managing digital industrial transformation (mDIT), ESCP Europe Berlin, Ruhr West University of Applied Sciences, Vytautas Magnus University, Duale Hochschule Baden Württemberg, NCSR, Jyväskylän yliopisto
Contributors: AbuJarour, S., Pawlowski, J., Bick, M., Bagucanskyte, M., Frankenberg, A., Hudak, R., Makropoulos, C., Pappa, D., Pitsilis, V., Pirkkalainen, H., Tannhauser, A. C., Trepule, E., Vidalis, A., Volungeviciene, A.
Number of pages: 8
Pages: 149-156
Publication date: 2015

Host publication information

Title of host publication: Wissens-Gemeinschaften 2015
Publisher: TUDpress Verlag der Wissenschaften GmbH
ISBN (Electronic): 978-395908010-1
ASJC Scopus subject areas: Computer Science Applications, Information Systems
Source: Scopus
Source ID: 84959421920

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Machine learning for adaptive bilateral filtering

We describe a supervised learning procedure for estimating the relation between a set of local image features and the local optimal parameters of an adaptive bilateral filter. A set of two entropy-based features is used to represent the properties of the image at a local scale. Experimental results show that our entropy-based adaptive bilateral filter outperforms other extensions of the bilateral filter where parameter tuning is based on empirical rules. Beyond bilateral filter, our learning procedure represents a general framework that can be used to develop a wide class of adaptive filters.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: Computational Imaging-CI, Signal Processing Research Community (SPRC), NVIDIA
Contributors: Frosio, I., Egiazarian, K., Pulli, K.
Publication date: 2015

Host publication information

Title of host publication: Image Processing: Algorithms and Systems XIII
Volume: 9399
Publisher: SPIE
Article number: 939908
ISBN (Print): 9781628414899

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Publisher: The International Society for Optical Engineering
ISSN (Print): 0277-786X
ISSN (Electronic): 1996-756X
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Adaptive bilateral filter, Denoising, Machine learning, Optimization, Training
Source: Scopus
Source ID: 84928485491

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Measuring bend losses in large-mode-area fibers

We investigate the measurement of bend losses in few-mode large-mode-area (LMA) fibers. The influence of the light source spectral characteristics, modal power content and cladding light on the measurement accuracy and precision is studied experimentally. Monte-Carlo simulations are performed to understand the distribution of the variations. This study provides practical guidelines for bend loss measurements.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Frontier Photonics, nLIGHT Corporation
Contributors: Ye, C., Koponen, J., Aallos, V., Kokki, T., Petit, L., Kimmelma, O.
Publication date: 2015

Host publication information

Title of host publication: Fiber Lasers XII: Technology, Systems, and Applications
Volume: 9344
Publisher: SPIE
Article number: 934425
ISBN (Electronic): 9781628414349
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Bend loss, Few-mode, Fiber amplifiers, Fiber lasers, Large-mode-area fiber, Silica optical fiber
Source: Scopus
Source ID: 84931311791

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Monolithic GaInNAsSb/GaAs VECSEL emitting at 1550 nm

We report the first monolithic GaAs-based vertical external-cavity surface-emitting laser (VECSEL) operating at 1550 nm. The VECSEL is based on a gain mirror which was grown by plasma-assisted molecular beam epitaxy and comprises 8 GaInNAsSb/GaAs quantum wells and an AlAs/GaAs distributed Bragg reflector. When pumped by an 808 nm diode laser, the laser exhibited an output power of 80 mW for a mount temperature of 16 °C.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Optoelectronics Research Centre, Research group: Semiconductor Technology and Applications, Frontier Photonics
Contributors: Korpijärvi, V., Kantola, E. L., Leinonen, T., Guina, M.
Publication date: 2015

Host publication information

Title of host publication: SPIE conference proceedings
Volume: 9349
Publisher: SPIE
Article number: 93490D
ISBN (Print): 9781628414394
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: dilute nitride, diode-pumped lasers, GaInNAsSb, semiconductor disk lasers, Semiconductor lasers, vertical external cavity surface emitting lasers
Source: Scopus
Source ID: 84925652903

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Multi-physics modeling and simulation of a frequency doubling antenna sensor for passive wireless strain sensing

This research studies multi-physics simulation of a frequency doubling antenna sensor for wireless strain measurement. The frequency doubling technology allows easy distinguishing of backscattered passive sensor signal (at the doubled frequency 2) from environmental reflection (at original reader interrogation frequency). Upon bonding to a base structure, because strain/deformation causes resonance frequency change of the antenna sensor, the passive wireless antenna sensor can be used to measure strain in the underlying base structure. To accurately model the mechanical and electromagnetic behaviors of the frequency doubling antenna sensor, a multiphysics coupled simulation approach is proposed. For simulating both the matching network performance and the antenna behavior under strain/deformation, two commercial software packages, COMSOL and ADS, are combined to leverage the strength of each package.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, Georgia Institute of Technology, School of Electrical and Computer Engineering
Contributors: Cho, C., Yi, X., Wang, Y., Tentzeris, M. M.
Number of pages: 9
Pages: 864-872
Publication date: 2015

Host publication information

Title of host publication: Structural Health Monitoring 2015: System Reliability for Verification and Implementation - Proceedings of the 10th International Workshop on Structural Health Monitoring, IWSHM 2015
Volume: 2
Publisher: DEStech Publications
ISBN (Electronic): 9781605951119
ASJC Scopus subject areas: Computer Science Applications, Health Information Management
Source: Scopus
Source ID: 84945541585

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

No-reference visual quality assessment for image inpainting

Inpainting has received a lot of attention in recent years and quality assessment is an important task to evaluate different image reconstruction approaches. In many cases inpainting methods introduce a blur in sharp transitions in image and image contours in the recovery of large areas with missing pixels and often fail to recover curvy boundary edges. Quantitative metrics of inpainting results currently do not exist and researchers use human comparisons to evaluate their methodologies and techniques. Most objective quality assessment methods rely on a reference image, which is often not available in inpainting applications. Usually researchers use subjective quality assessment by human observers. It is difficult and time consuming procedure. This paper focuses on a machine learning approach for no-reference visual quality assessment for image inpainting based on the human visual property. Our method is based on observation that Local Binary Patterns well describe local structural information of the image. We use a support vector regression learned on assessed by human images to predict perceived quality of inpainted images. We demonstrate how our predicted quality value correlates with qualitative opinion in a human observer study. Results are shown on a human-scored dataset for different inpainting methods.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: Computational Imaging-CI, Signal Processing Research Community (SPRC), Dept. of Radio-Electronics Systems, Don State Technical University
Contributors: Voronin, V. V., Frantc, V. A., Marchuk, V. I., Sherstobitov, A. I., Egiazarian, K.
Publication date: 2015

Host publication information

Title of host publication: Image Processing: Algorithms and Systems XIII
Publisher: SPIE
Article number: 93990U
ISBN (Print): 9781628414899

Publication series

Name: SPIE Conference Proceedings
Volume: 9399
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Inpainting, Machine learning, Metric, Quality assessment, SVR, Visual salience
Source: Scopus
Source ID: 84928473922

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Organisational knowledge flows and structural change the case of dispersed education organizations

The paper studies the implications of structural change for organisational knowledge flows. A qualitative case study was carried out in two vocational education and training organisations in Finland in order to recognise how the system-level structural change has been perceived by the education managers. The paper aims to bridge a research gap in knowledge management in situations of changing organisation structures. The results reveal that the externally driven structural change has led to concurrent and somewhat conflicting organisation structures leading to distortion of knowledge flows. Administrative Bureaucracies, team adhocracies and professional autonomies favour different structures and knowledge flows. The results also show that the integration of smaller organisations into large administrative entities further complicates the flow of knowledge and amplifies management challenges relating to concurrent structures. The paper calls for better integration of knowledge management into the strategic management of knowledge-intensive education organisations. The findings provide practical support for the management of previously independent education institutes to confront the structural change towards regional and geographically dispersed actors. More generally, the discussion contributes to the discussion on managing growing knowledge-intensive organisations and knowledge work.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Information Management and Logistics, Research group: Novi, School of Management (JKK)
Contributors: Laihonen, H., Syysnummi, P.
Number of pages: 14
Pages: 247-260
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: International Journal of Knowledge Management Studies
Volume: 6
Issue number: 3
ISSN (Print): 1743-8268
Ratings: 
  • Scopus rating (2015): CiteScore 0.56 SJR 0.182 SNIP 0.01
Original language: English
ASJC Scopus subject areas: Information Systems and Management, Computer Science Applications, Management Information Systems, Management of Technology and Innovation
Keywords: Education management, Knowledge flows, Knowledge management, VET
Source: Scopus
Source ID: 84946750279

Research output: Contribution to journalArticleScientificpeer-review

Power and wavelength scaling using semiconductor disk laser - bismuth fiber MOPA systems

We present a master oscillator power amplifier (MOPA) system that comprises a mode-locked semiconductor disk laser (SDL) emitting at 1.33 mu m and a bismuth-doped fiber amplifier. The mode-locked SDL was fabricated by wafer bonding an InP-based gain section with a GaAs-based distributed Bragg reflector (DBR) using (3-Mercaptopropyl)trimethoxysilane. The bismuth-doped fiber amplifier was pumped with a continuous wave SDL emitting at 1.18 mu m. The MOPA system produced pulses at a repetition rate of 827 MHz with a pulse energy of 0.62 nJ, which corresponds to an average output power of more than 0.5 W.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Frontier Photonics, Optoelectronics Research Centre, Research group: Ultrafast and intense lasers, Research group: Semiconductor Technology and Applications, Ulyanovsk State University, Fiber Optics Research Center, Russian Academy of Sciences
Contributors: Heikkinen, J., Gumenyuk, R., Rantamäki, A., Lyytikäinen, J., Leinonen, T., Zolotovskii, I., Melkumov, M., Dianov, E. M., Okhotnikov, O. G.
Number of pages: 7
Publication date: 2015

Host publication information

Title of host publication: Vertical External Cavity Surface Emitting Lasers (VECSELs) V
Place of publication: BELLINGHAM
Publisher: SPIE
Editor: Guina, M.
Article number: 93490E
ISBN (Print): 9781628414394

Publication series

Name: Proceedings of SPIE
Publisher: SPIE-INT SOC OPTICAL ENGINEERING
Volume: 9349
ISSN (Print): 0277-786X
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Semiconductor disk laser (SDL), vertical-external-cavity surface-emitting laser (VECSEL), modelocking, wafer bonding, bismuth-doped fiber, master oscillator power amplifier (MOPA), SUPERCONTINUUM GENERATION, OUTPUT POWER, PICOSECOND, VECSEL, PULSES, GHZ
Source: WOS
Source ID: 000353134900011

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Preserving natural scene lighting by strobe-lit video

Capturing images in low light intensity, and preserving ambient light in such conditions pose significant problems in terms of achievable image quality. Either the sensitivity of the sensor must be increased, filling the resulting image with noise, or the scene must be lit with artificial light, destroying the aesthetic quality of the image. While the issue has been previously tackled for still imagery using cross-bilateral filtering, the same problem exists in capturing video. We propose a method of illuminating the scene with a strobe light synchronized to every other frame captured by the camera, and merging the information from consecutive frames alternating between high gain and high intensity lighting. The motion between the frames is compensated using motion estimation based on block matching between strobe-illuminated frames. The uniform lighting conditions between every other frame make it possible to utilize conventional motion estimation methods, circumventing the image registration challenges faced in fusing flash/non-flash pairs from non-stationary images. The results of the proposed method are shown to closely resemble those computed using the same filter based on reference images captured at perfect camera alignment. The method can be applied starting from a simple set of three frames to video streams of arbitrary lengths with the only requirements being sufficiently accurate syncing between the imaging device and the lighting unit, and the capability to switch states (sensor gain high/low, illumination on/off) fast enough.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: 3D MEDIA, Signal Processing Research Community (SPRC)
Contributors: Suominen, O., Gotchev, A.
Publication date: 2015

Host publication information

Title of host publication: Image Processing: Algorithms and Systems XIII
Publisher: SPIE
Article number: 939919
ISBN (Print): 9781628414899

Publication series

Name: SPIE Conference Proceedings
Volume: 9399
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Keywords: Ambient light, Bilateral filter, Computational photography, Image denoising, Low-light, Motion compensation
Electronic versions: 
Source: Scopus
Source ID: 84928473920

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Real-time depth image-based rendering with layered dis-occlusion compensation and aliasing-free composition

Depth Image-based Rendering (DIBR) is a popular view synthesis technique which utilizes the RGB+D image format, also referred to as view-plus-depth scene representation. Classical DIBR is prone to dis-occlusion artefacts, caused by the lack of information in areas behind foreground objects, which appear visible in the synthesized images. A number of recently proposed compensation techniques have addressed the problem of hole filling. However, their computational complexity does not allow for real-time view synthesis and may require additional user input. In this work, we propose a hole-compensation technique, which works fully automatically and in a perceptually-correct manner. The proposed technique applies a two-layer model of the given RGB+D imagery, which is specifically tailored for rendering with free viewpoint selection. The main two components of the proposed technique are an adaptive layering of depth into relative 'foreground' and 'background' layers to be rendered separately and an additional blending filtering aimed at creating a blending function for aliasing cancellation during the process of view composition. The proposed real-time implementation turns ordinary view-plus-depth images to true 3D scene representations, which allow visualization in the fly-around manner.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: 3D MEDIA, Signal Processing Research Community (SPRC)
Contributors: Smirnov, S., Gotchev, A.
Publication date: 2015

Host publication information

Title of host publication: Proceedings of SPIE - The International Society for Optical Engineering
Publisher: SPIE
Article number: 93990T
ISBN (Print): 9781628414899

Publication series

Name: SPIE Conference Proceedings
Volume: 9399
ASJC Scopus subject areas: Applied Mathematics, Computer Science Applications, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Electronic versions: 
Source: Scopus
Source ID: 84928501129

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Roadmap for organic and printed electronics

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research group: Laboratory for Future Electronics, Tampere University of Technology, Augmented Human Activities (AHA), OE-A (Organic and Printed Electronics Association), PolyIC GmbH and Co. KG
Contributors: Hecker, K., Clemens, W., Lupo, D., Breitung, S.
Number of pages: 2
Pages: 125-126
Publication date: 2015

Host publication information

Title of host publication: Smart Systems Integration 2015 - 9th International Conference and Exhibition on Integration Issues of Miniaturized Systems: MEMS, NEMS, ICs and Electronic Components, SSI 2015
Publisher: Apprimus Verlag
ISBN (Electronic): 9783863592967
ASJC Scopus subject areas: Computer Science Applications, Computer Networks and Communications, Artificial Intelligence
Source: Scopus
Source ID: 84976314633

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Smart home gateway system over Bluetooth low energy with wireless energy transfer capability

As billions of sensors and smart meters connect to the Internet of Things (IoT), current wireless technologies are taking decisive steps to ensure their sustainable operation. One popular IoT scenario features a smart home service gateway, which becomes the central point of user’s home environment facilitating a multitude of tasks. Given that most IoT devices connected to residential gateway are small-scale and battery-powered, the key challenge is to extend their lifetime without recharging/replacing batteries. To this end, a novel radio technology named Bluetooth low energy (BLE) has recently been completed to enable energy-efficient data transfer. Another inspiring innovation is the capability of sensors to harvest wireless energy in their local environment. In this work, we envision a scenario where many in-home sensors are communicating with a smart gateway over the BLE protocol, while at the same time harvesting RF energy transmitted from the gateway wirelessly via a dedicated radio interface. We thoroughly investigate performance limitations of such wireless energy transfer interface (WETI) with dynamic analytical model and with important practical considerations. Our methodology delivers the upper bound on WETI operation coupled with BLE-based communication, which characterizes ultimate system performance over the class of practical radio and energy resource management algorithms.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Emerging Technologies for Nano-Bio-Info-Cogno, Wireless Communications and Positioning (WICO), International Insitute for Advanced Aerospace Technologies of St. Petersburg State University of Aerospace Instrumentation
Contributors: Galinina, O., Mikhaylov, K., Andreev, S., Turlikov, A., Koucheryavy, Y.
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Eurasip Journal on Wireless Communications and Networking
Volume: 2015
Issue number: 1
Article number: 178
ISSN (Print): 1687-1472
Ratings: 
  • Scopus rating (2015): CiteScore 0.96 SJR 0.362 SNIP 1.138
Original language: English
ASJC Scopus subject areas: Computer Networks and Communications, Signal Processing, Computer Science Applications
Keywords: Bluetooth low energy, Internet of Things, Sensors, Smart home gateway, Wireless energy transfer
Source: Scopus
Source ID: 84938840129

Research output: Contribution to journalArticleScientificpeer-review

Towards dependable automation

Automation runs the modern society and it’s critical systems. It is anetworked software product depending on the co-operation of old and new technologies.Information security for automation systems should be regarded in light ofthe most important quality required from automation—dependability. This chapterfocuses on process of developing dependable solutions for the entire lifecycle ofautomation systems. The approach includes a guideline for securing automation anda dependability model that is a data flow model extended with security and automationrequirements. Results of this analysis should be used in final requirementspecification for implementation. Dependability model is the key tool in securedevelopment lifecycle. It can be used in new product development, improving anold automation system and also during the active lifecycle of automation to manage inevitable changes occurring during the entire lifespan of automation system.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Tampere University of Technology, Department of Automation Science and Engineering, Research area: Information Systems in Automation
Contributors: Seppälä, J., Salmenperä, M.
Number of pages: 21
Pages: 229-249
Publication date: 2015

Host publication information

Title of host publication: Cyber Security: Analytics, Technology and Automation : Part IV
Publisher: Springer International Publishing
ISBN (Print): 978-3-319-18301-5
ISBN (Electronic): 978-3-319-18302-2

Publication series

Name: Intelligent Systems, Control and Automation: Science and Engineering
Volume: 78
ISSN (Print): 2213-8986
ASJC Scopus subject areas: Computer Science Applications, Control and Systems Engineering, Mechanical Engineering, Control and Optimization
Source: Scopus
Source ID: 84934873164

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

Uncertainty propagation of iron loss from characterization measurements to computation of electrical machines

Purpose - The purpose of this paper is to find out how uncertainties in the characterization of magnetic materials propagate through identification and numerical simulation to the computation of iron losses in electrical machines. Design/methodology/approach - The probabilistic uncertainties in the iron losses are modelled with the spectral approach using chaos polynomials. The Sobol indices are used for the global sensitivity analysis. The machine is modelled with a 2D finite element method and the iron losses are computed with a previously developed accurate method. Findings - The uncertainties propagate in different ways to the different components of losses, i.e. eddy current, hysteresis, and excess losses. The propagation is also different depending on the investigated region of the machine, i.e. Stator or rotor teeth, yokes, tooth tips. Research limitations/implications - The method does not account for uncertainties related to the manufacturing process, which might result in even larger variability. Practical implications - A major implication of the findings is that the identification of iron loss parameters at low frequencies does not affect the loss variability. The identification with high-frequency measurement is very important for the rotor tooth tips. The variability in the excess loss parameters is of low impact. Originality/value - The presented results are of importance for the magnetic material manufacturers and the electrical machine designers. The manufacturers can plan the measurement and identification procedures as to minimize the output variability of the parameters. The designers of the machine can use the result and the presented procedures to estimate the variability of their design.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Smart Energy Systems (SES), Aalto University, L2EP, Université Lille 1, L2EP, Arts et Metiers Paris Tech
Contributors: Belahcen, A., Rasilo, P., Nguyen, T. T., Clénet, S.
Number of pages: 13
Pages: 624-636
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering
Volume: 34
Issue number: 3
ISSN (Print): 0332-1649
Ratings: 
  • Scopus rating (2015): CiteScore 0.68 SJR 0.231 SNIP 0.554
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Computational Theory and Mathematics, Applied Mathematics
Keywords: Electrical machine, Finite element methods, Iron losses, Uncertainty estimation
Source: Scopus
Source ID: 84929258660

Research output: Contribution to journalArticleScientificpeer-review

2.4 GHz inkjet-printed RF energy harvester on bulk cardboard substrate

An experimental investigation on the inkjetprinted power harvester for 2.4GHz and review of RF characterization of substrate and printed conductors are presented in this paper. A one stage discrete rectifier based on a voltage doubler structure and a planar monopole antenna are fabricated on cardboard using inkjet printing. The performance of the whole system is examined by measuring the output voltage of the RF power harvester. By the utilization of the proposed idea, the fabrication of low-cost environmentally-friendly battery-less wireless modules is conceivable.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Electronics and Communications Engineering, Research group: Wireless Identification and Sensing Systems Research Group, Sensing Systems for Wireless Medicine (MediSense), Aristotle University of Thessaloniki, School of Electrical and Computer Engineering, Georgia Institute of Technology, School of Electrical and Computer Engineering
Contributors: Khonsari, Z., Björninen, T., Tentzeris, M. M., Sydänheimo, L., Ukkonen, L.
Number of pages: 3
Pages: 153-155
Publication date: Jan 2015

Host publication information

Title of host publication:  2015 IEEE Radio and Wireless Symposium (RWS), 25-28 Jan. 2015, San Diego, CA
Publisher: IEEE
ISBN (Print): 978-1-4799-5507-7
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications, Electrical and Electronic Engineering, Communication
Keywords: additive manufacturing, cardboard substrate, energy harvester, Inkjet printing, planar monopole
Source: Scopus
Source ID: 84937875886

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Estimation of GFP-tagged RNA numbers from temporal fluorescence intensity data

Motivation: MS2-GFP-tagging of RNA is currently the only method to measure intervals between consecutive transcription events in live cells. For this, new transcripts must be accurately detected from intensity time traces. Results: We present a novel method for automatically estimating RNA numbers and production intervals from temporal data of cell fluorescence intensities that reduces uncertainty by exploiting temporal information. We also derive a robust variant, more resistant to outliers caused e.g. by RNAs moving out of focus. Using Monte Carlo simulations, we show that the quantification of RNA numbers and production intervals is generally improved compared with previous methods. Finally, we analyze data from live Escherichia coli and show statistically significant differences to previous methods. The new methods can be used to quantify numbers and production intervals of any fluorescent probes, which are present in low copy numbers, are brighter than the cell background and degrade slowly. Availability: Source code is available under Mozilla Public License at http://www.cs.tut.fi/%7ehakkin22/jumpdet/. Contact:

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Research group: Laboratory of Biosystem Dynamics-LBD, Multi-scaled biodata analysis and modelling (MultiBAM)
Contributors: Häkkinen, A., Ribeiro, A. S.
Number of pages: 7
Pages: 69-75
Publication date: 1 Jan 2015
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 31
Issue number: 1
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2015): CiteScore 6.06 SJR 4.97 SNIP 2.151
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability, Medicine(all)

Bibliographical note

Contribution: organisation=sgn,FACT1=1<br/>Portfolio EDEND: 2014-09-15<br/>Publisher name: Oxford University Press

Source: researchoutputwizard
Source ID: 396

Research output: Contribution to journalArticleScientificpeer-review

Spectral and energy efficiency of ultra-dense networks under different deployment strategies

To tackle the 1000× mobile data challenge, the research towards the 5th generation of mobile cellular networks is currently ongoing. One clear enabler toward substantially improved network area capacities is the increasing level of network densification at different layers of the overall heterogeneous radio access system. Ultra-dense deployments, or DenseNets, seek to take network densification to a whole new level, where extreme spatial reuse is deployed. This article looks into DenseNets from the perspectives of different deployment strategies, covering the densification of the classical macro layer, extremely dense indoor femto layer, as well as outdoor distributed antenna system (DAS), which can be dynamically configured as a single microcell or multiple independent microcells. Also, the potential of a new indoor-to-outdoor service provisioning paradigm is examined. The different deployment solutions are analyzed from the network area spectral and network energy efficiency perspectives, with extreme densification levels, including both indoor and outdoor use scenarios. The obtained results indicate that dedicated indoor solutions with densely deployed femtocells are much more spectrumand energy-efficient approaches to address the enormous indoor capacity demands compared to densifying the outdoor macro layer, when the systems are pushed to their capacity limits. Furthermore, the dynamic outdoor DAS concept offers an efficient and capacity-adaptive solution to provide outdoor capacity, on demand, in urban areas.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Wireless Communications and Positioning, Wireless Communications and Positioning (WICO)
Contributors: Yunas, S., Valkama, M., Niemelä, J.
Number of pages: 11
Pages: 90-100
Publication date: 1 Jan 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Communications Magazine
Volume: 53
Issue number: 1
ISSN (Print): 0163-6804
Ratings: 
  • Scopus rating (2015): CiteScore 8.15 SJR 2.225 SNIP 5.331
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Computer Networks and Communications
Source: Scopus
Source ID: 84921459532

Research output: Contribution to journalArticleScientificpeer-review

The assessment of constructability: BIM cases

The constructability appraisal methods developed so far are based on evaluating and analysing the major design components and systems of an entire building, such as structural systems, materials and production techniques. At first, this paper discusses the current practice of constructability assessment used in Finland and next it introduces an experimental constructability assessment method (ECAM) using building information models (BIM) as a source of constructability information. Interviews of design and construction professionals were used to explore the current practice of constructability assessment. An experimental assessment methodology was developed and tested in case projects. According to the interviews, the main assessment method used was the inspection of drawings, and constructability was assessed occasionally during the design development stage and more systematically at the very end of the detailed design stage with varying professional participants in meetings. Using ECAM in the project level a constructability score of a building and building type can be analysed. When using ECAM on the level of structural elements a constructability score of elements can be measured. These scores incorporate information for the development of constructability. In Finland, the development of a systematic review process of constructability will be needed. The constructability assessment methodology suggested in the article is experimental and is to be developed and tested further before using it reliably in building projects. The assessment combining visual and analytical approach will change present methods for assessing constructability.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Life Cycle Effectiveness of the Built Environment (LCE@BE), Aalto University
Contributors: Tauriainen, M. K., Puttonen, J. A., Saari, A. J.
Number of pages: 17
Pages: 51-67
Publication date: 1 Jan 2015
Peer-reviewed: Yes

Publication information

Journal: Journal of Information Technology in Construction
Volume: 20
ISSN (Print): 1403-6835
Ratings: 
  • Scopus rating (2015): CiteScore 1.18 SJR 0.398 SNIP 1.114
Original language: English
ASJC Scopus subject areas: Civil and Structural Engineering, Building and Construction, Computer Science Applications
Keywords: Analyses, Assessment, BIM, Buildability, Constructability, Modelling, Quantitative
Source: Scopus
Source ID: 84921652278

Research output: Contribution to journalArticleScientificpeer-review

Video summarization based on Subclass Support Vector Data Description

In this paper, we describe a method for video summarization that operates on a video segment level. We formulate this problem as the one of automatic video segment selection based on a learning process that employs salient video segment paradigms. We design an hierarchical learning scheme that consists of two steps. At the first step, an unsupervised process is performed in order to determine salient video segment types. The second step is a supervised learning process that is performed for each of the salient video segment type independently. For the latter case, since only salient training examples are available, the problem is stated as an one-class classification problem. In order to take into account subclass information that may appear in the video segment types, we introduce a novel formulation of the Support Vector Data Description method that exploits subclass information in its optimization process. We evaluate the proposed approach in three Hollywood movies, where the performance of the proposed Subclass SVDD (SSVDD) algorithm is compared with that of related methods. Experimental results show that the adoption of both hierarchical learning and the proposed SSVDD method contribute to the final classification performance.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Mygdalis, V., Iosifidis, A., Tefas, A., Pitas, I.
Number of pages: 5
Pages: 183-187
Publication date: 15 Jan 2015

Host publication information

Title of host publication: IEEE SSCI 2014 - 2014 IEEE Symposium Series on Computational Intelligence - CIES 2014: 2014 IEEE Symposium on Computational Intelligence for Engineering Solutions, Proceedings
Publisher: The Institute of Electrical and Electronics Engineers, Inc.
ISBN (Print): 9781479945108
ASJC Scopus subject areas: Computer Science Applications, Artificial Intelligence, Computational Theory and Mathematics
Source: Scopus
Source ID: 84922795880

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Fault tolerant control architecture design for mobile manipulation in scientific facilities

This paper describes one of the challenging issues implied by scientific infrastructures on a mobile robot cognition architecture. For a generally applicable cognition architecture, we study the dependencies and logical relations between several tasks and subsystems. The overall view of the software modules is described, including their relationship with a fault management module that monitors the consistency of the data flow among the modules. The fault management module is the solution of the deliberative architecture for the single point failures, and the safety anchor is the reactive solution for the faults by redundant equipment. In addition, a hardware architecture is proposed to ensure safe robot movement as a redundancy for the cognition of the robot. The method is designed for a four-wheel steerable (4WS) mobile manipulator (iMoro) as a case study.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Intelligent Hydraulics and Automation, Research group: Mobile manipulation, Research group: Field robotics and control, Field robotics for efficient work sites (FIRE)
Contributors: M. Aref, M., Oftadeh, R., Ghabcheloo, R., Mattila, J.
Publication date: 29 Jan 2015
Peer-reviewed: Yes

Publication information

Journal: international Journal of Advanced Robotic Systems
Volume: 12
Issue number: 4
ISSN (Print): 1729-8806
Ratings: 
  • Scopus rating (2015): CiteScore 1.02 SJR 0.346 SNIP 0.944
Original language: English
ASJC Scopus subject areas: Software, Artificial Intelligence, Computer Science Applications
Keywords: Architecture design, Autonomous vehicle drive, Cognition, Mobile robot, Remote handling
Source: Scopus
Source ID: 84923377541

Research output: Contribution to journalArticleScientificpeer-review

Communication challenges in high-density deployments of wearable wireless devices

Wearable wireless devices are very likely to soon move into the mainstream of our society, led by the rapidly expanding multibillion dollar health and fitness markets. Should wearable technology sales follow the same pattern as those of smartphones and tablets, these new devices (a.k.a. wearables) will see explosive growth and high adoption rates over the next five years. It also means that wearables will need to become more sophisticated, capturing what the user sees, hears, or even feels. However, with an avalanche of new wearables, we will need to find ways to supply them with low-latency highspeed data connections to enable truly demanding use cases such as augmented reality. This is particularly true for high-density wearable computing scenarios, such as public transportation, where existing wireless technology may have difficulty supporting stringent application requirements. In this article, we summarize our recent progress in this area with a comprehensive review of current and emerging connectivity solutions for high-density wearable deployments, their relative performance, and open communication challenges.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Emerging Technologies for Nano-Bio-Info-Cogno, Intelligent dexterity for secure networked infrastructure and applications (IDSNIA), Intel Corporation
Contributors: Pyattaev, A., Johnsson, K., Andreev, S., Koucheryavy, Y.
Number of pages: 7
Pages: 12-18
Publication date: 1 Feb 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Wireless Communications
Volume: 22
Issue number: 1
ISSN (Print): 1536-1284
Ratings: 
  • Scopus rating (2015): CiteScore 6.69 SJR 1.913 SNIP 3.92
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications
Source: Scopus
Source ID: 84924943737

Research output: Contribution to journalArticleScientificpeer-review

Semantic Labeling of Places based on Phone Usage Features using Supervised Learning

Nowadays mobile applications demand higher context awareness. The applications aim to understand the user's context (e.g., home or at work) and provide services tailored to the users. The algorithms responsible for inferring the user's context are the so-called context inference algorithms, the place detection being a particular case. Our hypothesis is that people use mobile phones differently when they are located in different places (e.g. longer calls at home than at work). Therefore, the usage of the mobile phones could be an indicator of the users' current context. The objective of the work is to develop a system that can estimate the user's place label (home, work, etc.), based on phone usage. As training and validation set, we use a database containing phone usage information of 200 users over several months including phone call and SMS logs, multimedia usage, accelerometer, GPS, network information and system information. The data was split into visits, i.e., periods of uninterrupted time that the user has been in a certain place (Home, Work, Leisure, etc.). The data include information about the phone usage during the visits, and the semantic label of the place visited (Home, Work, etc.). We consider two approaches to represent this data: the first approach (so-called visits approach) saves each visit separately; the second approach (so-called places approach) combines all visits of one user to a certain place and creates place-specific information. For place detection, we used five popular classification methods, Naïve Bayes, Decision Tree, Bagged Tree, Neural Network and K-Nearest Neighbors, in both representation approaches. We evaluated their classification rates and found that: 1) Bagged Tree outperforms the other methods; 2) the places data-representation gives better results than the visits data-representation.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Mathematics, Research group: MAT Intelligent Information Systems Laboratory, Department of Automation Science and Engineering, Research area: Dynamic Systems, Research group: Positioning, Wireless Communications and Positioning (WICO)
Contributors: Rivero Rodriguez, A., Leppäkoski, H., Piché, R.
Number of pages: 6
Pages: 97-102
Publication date: 5 Feb 2015

Host publication information

Title of host publication: 2014 Ubiquitous Positioning Indoor Navigation and Location Based Service, UPINLBS 2014 - Conference Proceedings
Place of publication: Piscataway, NJ, USA
Publisher: IEEE
Article number: 7033715
ISBN (Print): 9781479960040
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: Context Inference, Location and positioning services, Place detection, Semantic positioning
Electronic versions: 

Bibliographical note

ORG=mat,0.6
ORG=ase,0.4

Portfolio EDEND: 2015-01-14 <br /> publication_forum:72750

Source: researchoutputwizard
Source ID: 30

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Designing controllers with reduced order internal models

In this technical note we study robust output tracking for autonomous linear systems. We introduce a new approach to designing robust controllers using a recent observation that a full internal model is not always necessary for robustness. Especially this may be the case if the control law is only required to be robust with respect to a specific predetermined class of uncertainties in the parameters of the plant. The results are illustrated with an example on robust output tracking for coupled harmonic oscillators.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Mathematics, Research group: MAT Mathematical and semantic modelling
Contributors: Paunonen, L.
Number of pages: 6
Pages: 775-780
Publication date: 1 Mar 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Automatic Control
Volume: 60
Issue number: 3
Article number: 6826480
ISSN (Print): 0018-9286
Ratings: 
  • Scopus rating (2015): CiteScore 5.08 SJR 4.285 SNIP 3.218
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Control and Systems Engineering, Computer Science Applications
Source: Scopus
Source ID: 84923355671

Research output: Contribution to journalArticleScientificpeer-review

Task-based information interaction evaluation: The viewpoint of program theory

Evaluation is central in research and development of information retrieval (IR). In addition to designing and implementing new retrieval mechanisms, one must also show through rigorous evaluation that they are effective. A major focus in IR is IR mechanisms' capability of ranking relevant documents optimally for the users, given a query. Searching for information in practice involves searchers, however, and is highly interactive. When human searchers have been incorporated in evaluation studies, the results have of ten suggested that better ranking does not necessarily lead to better search task, or work task, performance. Therefore, it is not clear which system or interface features should be developed to improve the effectiveness of human task performance. In the present article, we focus on the evaluation of task-based information interaction (TBII). We give special emphasis to learning tasks to discuss TBII in more concrete terms. Information interaction is here understood as behavioral and cognitive activities related to task planning, searching information items, selecting between them, working with them, and synthesizing and reporting. These five generic activities contribute to task performance and outcome and can be supported by information systems. In an attempt toward task-based evaluation, we introduce program theory as the evaluation framework. Such evaluation can investigate whether a program consisting of TBII activities and tools works and how it works and, further, provides a causal description of program (in)effectiveness. Our goal in the present article is to structure TBII on the basis of the five generic activities and consider the evaluation of each activity using the program theory framework. Finally, we combine these activity-based program theories in an overall evaluation framework for TBII. Such an evaluation is complex due to the large number of factors affecting information interaction. Instead of presenting tested program theories, we illustrate how the evaluation of TBII should be accomplished using the program theory framework in the evaluation of systems and behaviors, and their interactions, comprehensively in context.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: University of Tampere
Contributors: Järvelin, K., Vakkari, P., Arvola, P., Baskaya, F., Järvelin, A., Kekäläinen, J., Keskustalo, H., Kumpulainen, S., Saastamoinen, M., Savolainen, R., Sormunen, E.
Publication date: 1 Mar 2015
Peer-reviewed: Yes

Publication information

Journal: ACM Transactions on Information Systems
Volume: 33
Issue number: 1
Article number: 3
ISSN (Print): 1046-8188
Ratings: 
  • Scopus rating (2015): CiteScore 2.71 SJR 0.655 SNIP 2.007
Original language: English
ASJC Scopus subject areas: Information Systems, Business, Management and Accounting(all), Computer Science Applications
Keywords: Experimentation, Human factors, Theory
Source: Scopus
Source ID: 84926320780

Research output: Contribution to journalArticleScientificpeer-review

The internet of Bio-Nano things

The Internet of Things (IoT) has become an important research topic in the last decade, where things refer to interconnected machines and objects with embedded computing capabilities employed to extend the Internet to many application domains. While research and development continue for general IoT devices, there are many application domains where very tiny, concealable, and non-intrusive Things are needed. The properties of recently studied nanomaterials, such as graphene, have inspired the concept of Internet of NanoThings (IoNT), based on the interconnection of nanoscale devices. Despite being an enabler for many applications, the artificial nature of IoNT devices can be detrimental where the deployment of NanoThings could result in unwanted effects on health or pollution. The novel paradigm of the Internet of Bio-Nano Things (IoBNT) is introduced in this paper by stemming from synthetic biology and nanotechnology tools that allow the engineering of biological embedded computing devices. Based on biological cells, and their functionalities in the biochemical domain, Bio-NanoThings promise to enable applications such as intra-body sensing and actuation networks, and environmental control of toxic agents and pollution. The IoBNT stands as a paradigm-shifting concept for communication and network engineering, where novel challenges are faced to develop efficient and safe techniques for the exchange of information, interaction, and networking within the biochemical domain, while enabling an interface to the electrical domain of the Internet.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Emerging Technologies for Nano-Bio-Info-Cogno, Wireless Communications and Positioning (WICO), University of Nebraska, Georgia Institute of Technology
Contributors: Akyildiz, I. F., Pierobon, M., Balasubramaniam, S., Koucheryavy, Y.
Number of pages: 9
Pages: 32-40
Publication date: 1 Mar 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Communications Magazine
Volume: 53
Issue number: 3
ISSN (Print): 0163-6804
Ratings: 
  • Scopus rating (2015): CiteScore 8.15 SJR 2.225 SNIP 5.331
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Computer Networks and Communications
Source: Scopus
Source ID: 84925851587

Research output: Contribution to journalArticleScientificpeer-review

Variable switching point predictive torque control with extended prediction horizon

This paper introduces the extension of the prediction horizon in the one-step variable switching point predictive torque control (VSP2TC). Even though in the majority of power electronics applications using model predictive control (MPC) based schemes, a prediction horizon of one suffices, the use of longer prediction horizons offers substantial performance benefits. To highlight this, the proposed algorithm is applied to a low voltage (LV) drive system, which comprises a two-level inverter and an induction machine (IM). As it is shown, by extending the prediction horizon, important drive quality indices, such as the torque ripple, and the total harmonic distortion (THD) of the stator currents are reduced. However, the computational effort required for solving the formulated optimization problem in real time can be overwhelming. The implementation of a branch-and-bound technique is introduced to front this tricky matter. Simulation results verify the performance of the presented control strategy.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Smart Energy Systems (SES), National Technical University of Athens, Technische Universitat Munchen
Contributors: Alevras, I., Karamanakos, P., Manias, S., Kennel, R.
Number of pages: 6
Pages: 2352-2357
Publication date: 18 Mar 2015

Host publication information

Title of host publication: 2015 IEEE International Conference on Industrial Technology, ICIT 2015
Publisher: Institute of Electrical and Electronics Engineers Inc.
Edition: June
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications
Source: Scopus
Source ID: 84937723977

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Multistep reactions of water with small Pdn clusters: A first principles study

Multistep dissociative chemisorption reactions of water with Pd4 and Pd7 clusters were studied using density functional theory. The adsorption energies and referred adsorption sites from water molecule (H2O) to partially dissociative (H2+O and OH+H), then to fully dissociative (O+H+H) configurations are carefully determined. It is found that the adsorption energies of three dissociative reactions are 5-6 times larger than that of water molecule. Atop sites of Pd4 and Pd7 clusters are found to be the most stable sites for the adsorbed H2O molecule. For the coadsorption cases of partially and fully dissociated products, H2 and OH molecules preferably tend to bind at the low coordination (atop or bridge) sites, and O and H atoms prefer to adsorb on the high coordination (hollow) sites. It is also found that the most favorable adsorption sites for the molecular adsorbates (H2O, H2 and OH) are adjacent to the Pd atoms with the largest site-specific polarizabilities. Therefore, site-specific polarizability is a good predictor of the favorable adsorption sites for the weakly bound molecules. The different directions of charge transfer between the Pd clusters and the adsorbate(s) is observed. Furthermore, the processes of the adsorption, dissociation, and the dissociative products diffusion of H2O are analyzed.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Computational Science X (CompX), Northwest University China, Nanjing University
Contributors: Liang, Y., Ma, L., Wang, J., Wang, G.
Publication date: 1 May 2015
Peer-reviewed: Yes

Publication information

Journal: Journal of Theoretical and Computational Chemistry
Volume: 14
Issue number: 3
Article number: 1550017
ISSN (Print): 0219-6336
Ratings: 
  • Scopus rating (2015): CiteScore 0.57 SJR 0.249 SNIP 0.321
Original language: English
ASJC Scopus subject areas: Physical and Theoretical Chemistry, Computational Theory and Mathematics, Computer Science Applications
Keywords: Chemisorption, cluster, density functional theory, transition state
Source: Scopus
Source ID: 84930178634

Research output: Contribution to journalArticleScientificpeer-review

Recent advances in antenna design and interference cancellation algorithms for in-band full duplex relays

In-band full-duplex relays transmit and receive simultaneously at the same center frequency, hence offering enhanced spectral efficiency for relay deployment. In order to deploy such full-duplex relays, it is necessary to efficiently mitigate the inherent self-interference stemming from the strong transmit signal coupling to the sensitive receive chain. In this article, we present novel state-of-the-art antenna solutions as well as digital self-interference cancellation algorithms for compact MIMO fullduplex relays, specifically targeted for reduced-cost deployments in local area networks. The presented antenna design builds on resonant wavetraps and is shown to provide passive isolations on the order of 60-70 dB. We also discuss and present advanced digital cancellation solutions, beyond classical linear processing, specifically tailored against nonlinear distortion of the power amplifier when operating close to saturation. Measured results from a complete demonstrator system, integrating antennas, RF cancellation, and nonlinear digital cancellation, are also presented, evidencing close to 100 dB of overall self-interference suppression. The reported results indicate that building and deploying compact full-duplex MIMO relays is already technologically feasible.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Wireless Communications and Positioning, Tampere University of Technology, Wireless Communications and Positioning (WICO), Aalto University
Contributors: Heino, M., Korpi, D., Huusari, T., Antonio-Rodríguez, E., Venkatasubramanian, S., Riihonen, T., Anttila, L., Icheln, C., Haneda, K., Wichman, R., Valkama, M.
Number of pages: 11
Pages: 91-101
Publication date: 1 May 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Communications Magazine
Volume: 53
Issue number: 5
ISSN (Print): 0163-6804
Ratings: 
  • Scopus rating (2015): CiteScore 8.15 SJR 2.225 SNIP 5.331
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Computer Networks and Communications

Bibliographical note

AUX=elt,"Huusari, Timo"

Source: Scopus
Source ID: 84929335830

Research output: Contribution to journalArticleScientificpeer-review

Urothelial cancer gene regulatory networks inferred from large-scale RNAseq, Bead and Oligo gene expression data

Background: Urothelial pathogenesis is a complex process driven by an underlying network of interconnected genes. The identification of novel genomic target regions and gene targets that drive urothelial carcinogenesis is crucial in order to improve our current limited understanding of urothelial cancer (UC) on the molecular level. The inference of genome-wide gene regulatory networks (GRN) from large-scale gene expression data provides a promising approach for a detailed investigation of the underlying network structure associated to urothelial carcinogenesis. Methods: In our study we inferred and compared three GRNs by the application of the BC3Net inference algorithm to large-scale transitional cell carcinoma gene expression data sets from Illumina RNAseq (179 samples), Illumina Bead arrays (165 samples) and Affymetrix Oligo microarrays (188 samples). We investigated the structural and functional properties of GRNs for the identification of molecular targets associated to urothelial cancer. Results: We found that the urothelial cancer (UC) GRNs show a significant enrichment of subnetworks that are associated with known cancer hallmarks including cell cycle, immune response, signaling, differentiation and translation. Interestingly, the most prominent subnetworks of co-located genes were found on chromosome regions 5q31.3 (RNAseq), 8q24.3 (Oligo) and 1q23.3 (Bead), which all represent known genomic regions frequently deregulated or aberated in urothelial cancer and other cancer types. Furthermore, the identified hub genes of the individual GRNs, e.g., HID1/DMC1 (tumor development), RNF17/TDRD4 (cancer antigen) and CYP4A11 (angiogenesis/ metastasis) are known cancer associated markers. The GRNs were highly dataset specific on the interaction level between individual genes, but showed large similarities on the biological function level represented by subnetworks. Remarkably, the RNAseq UC GRN showed twice the proportion of significant functional subnetworks. Based on our analysis of inferential and experimental networks the Bead UC GRN showed the lowest performance compared to the RNAseq and Oligo UC GRNs. Conclusion: To our knowledge, this is the first study investigating genome-scale UC GRNs. RNAseq based gene expression data is the data platform of choice for a GRN inference. Our study offers new avenues for the identification of novel putative diagnostic targets for subsequent studies in bladder tumors.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, BioMediTech, Research Community on Data-to-Decision (D2D), BioMediTech - Institute of Biosciences and Medical Technology, Queen's University, Belfast, Northern Ireland
Contributors: Matos Simoes, R. D., Dalleau, S., Williamson, K. E., Emmert-Streib, F.
Publication date: 14 May 2015
Peer-reviewed: Yes

Publication information

Journal: BMC Systems Biology
Volume: 9
Article number: 21
ISSN (Print): 1752-0509
Ratings: 
  • Scopus rating (2015): CiteScore 2.54 SJR 1.549 SNIP 0.89
Original language: English
ASJC Scopus subject areas: Molecular Biology, Structural Biology, Applied Mathematics, Modelling and Simulation, Computer Science Applications
Keywords: BC3Net, Computational genomics, Gene regulatory network, Urothelial cancer
Source: Scopus
Source ID: 84931068065

Research output: Contribution to journalArticleScientificpeer-review

Long-term epileptic EEG classification via 2D mapping and textural features

Interpretation of long-term Electroencephalography (EEG) records is a tiresome task for clinicians. This paper presents an efficient, low cost and novel approach for patient-specific classification of long-term epileptic EEG records. We aim to achieve this with the minimum supervision from the neurologist. To accomplish this objective, first a novel feature extraction method is proposed based on the mapping of EEG signals into two dimensional space, resulting into a texture image. The texture image is constructed by mapping and scaling EEG signals and their associated frequency sub-bands into the gray-level image domain. Image texture analysis using gray level co-occurrence matrix (GLCM) is then applied in order to extract multivariate features which are able to differentiate between seizure and seizure-free events. To evaluate the discriminative power of the proposed feature extraction method, a comparative study is performed, against other dedicated feature extraction methods. The comparative performance evaluations show that the proposed feature extraction method can outperform other state-of-art feature extraction methods with a low computational cost. With a training rate of 25%, the overall sensitivity of 70.19% and specificity of 97.74% are achieved in the classification of over 163 h of EEG records using support vector machine (SVM) classifiers with linear kernels and trained by the stochastic gradient descent (SGD) algorithm.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Research group: Video, Research group: Filterbanks, Research Community on Data-to-Decision (D2D), Qatar University
Contributors: Samiee, K., Kiranyaz, S., Gabbouj, M., Saramäki, T.
Number of pages: 11
Pages: 7175-7185
Publication date: 8 Jun 2015
Peer-reviewed: Yes

Publication information

Journal: Expert Systems with Applications
Volume: 42
Issue number: 20
ISSN (Print): 0957-4174
Ratings: 
  • Scopus rating (2015): CiteScore 4.11 SJR 1.473 SNIP 2.509
Original language: English
ASJC Scopus subject areas: Artificial Intelligence, Computer Science Applications, Engineering(all)
Keywords: CHB-MIT dataset, Electroencephalography, Epileptic seizure classification, Haralick, Stochastic gradient descent, Textural features
Source: Scopus
Source ID: 84930636361

Research output: Contribution to journalArticleScientificpeer-review

Planar monopole antennas on substrates fabricated through an additive manufacturing process

This paper introduces a new method for creating a flexible antenna using additive manufacturing for the construction of the substrate. Two substrates were created using a 3D multi-material polymer printer. These substrates were composed using different ratios of the two materials supported by the printer. Planar monopole antennas with a bevel were placed on top of these substrates to form flexible antennas. This paper demonstrates a quick way to create antennas that can be used on non-rigid structures.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Sensing Systems for Wireless Medicine (MediSense), Georgia Institute of Technology, School of Electrical and Computer Engineering, George Woodruff School of Mechanical Engineering, Georgia Institute of Technology
Contributors: Saintsing, C. D., Yu, K., Qi, H. J., Tentzeris, M.
Number of pages: 3
Pages: 159-161
Publication date: 19 Jun 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Radio and Wireless Symposium, RWS
Volume: 2015-June
Issue number: June
Article number: 7129744
Original language: English
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications, Electrical and Electronic Engineering, Communication
Keywords: 3D Printing, Additive Manufacturing, Broadband Antennas, Flexible Antennas
Source: Scopus
Source ID: 84937963448

Research output: Contribution to journalArticleScientificpeer-review

Blind estimation of speckle variance in synthetic aperture radar images

A task of blind estimation of multiplicative noise (speckle) variance in multi-look images acquired by radars with synthesized aperture array is considered. It is shown that there are several factors affecting accuracy of such estimation. The main of them are spatial correlation of the speckle, complexity of an analyzed image and peculiarities of a method used. Spatial and spectral domain approaches are analyzed. It is shown that for both approaches spatial correlation of the speckle is to be estimated and taken into account. Results for real life TerraSAR-X data are presented as illustrations and for analyzing methods' accuracy.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Tampere University of Technology, Department of Signal Processing, Research group: Computational Imaging-CI, Signal Processing Research Community (SPRC), National Aerospace University
Contributors: Abramova, V. V., Kozhemiakin, R., Abramov, S. K., Lukin, V. V., Zelensky, A. A., Egiazarian, K.
Publication date: 25 Jun 2015

Host publication information

Title of host publication: 2015 International Conference on Antenna Theory and Techniques: Dedicated to 95 Year Jubilee of Prof. Yakov S. Shifrin, ICATT 2015 - Proceedings
Publisher: The Institute of Electrical and Electronics Engineers, Inc.
ISBN (Print): 9781479985579
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications
Keywords: blind estimation, multi-look, SAR, speckle variance

Bibliographical note

EXT="Lukin, V. V."

Source: Scopus
Source ID: 84939434768

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Experimental study of bispectrum-based encoding in radio communication system

This paper is devoted to a novel multi-frequency and bispectrum-based encoding technique designed for radio communication systems. An experimental study of an interference resistance in digital communication is performed using a novel bispectrum-based strategy. Test statistics evaluated in the form of peak values of magnitude bispectrum estimates are proposed for triplet-signals discrimination. Bit error rates assessed experimentally in a radio communication link contaminated by additive Gaussian noise and fading are studied within a wide range of input signal-to-noise ratio (SNR). Advantages of the proposed bispectral-based signal processing as compared with common phase and frequency shift keying are demonstrated and discussed.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: Algebraic and Algorithmic Methods in Signal Processing AAMSP, Signal Processing Research Community (SPRC), National Aerospace University
Contributors: Naumenko, V. V., Solodovnik, V. F., Totsky, A. V., Zelensky, A. A., Astola, J. T.
Number of pages: 3
Publication date: 25 Jun 2015

Host publication information

Title of host publication: 2015 International Conference on Antenna Theory and Techniques: Dedicated to 95 Year Jubilee of Prof. Yakov S. Shifrin, ICATT 2015 - Proceedings
Publisher: The Institute of Electrical and Electronics Engineers, Inc.
ISBN (Print): 9781479985579
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications
Keywords: bispectrum, digital communication system, fading, interference immunity, phase coupling, triplet-signal
Source: Scopus
Source ID: 84939448255

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Collaborative cloud-based management of home networks

Future home networks are expected to become extremely sophisticated, yet only the most technically adept persons are equipped with skills to manage them. In this paper, we provide a novel solution as to how complex smart home networks can be collaboratively managed with the assistance of operators and third party experts. Our solution rests in separating the management and control functionalities of the home access points and routers, away from the actual connectivity, traffic forwarding and routing operations within the home network. By so doing, we present a novel REST-based architecture in which the management of the home network can be hosted in an entirely separate, external cloud-based infrastructure, which models the network within the home as a resource graph.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Pervasive Computing, Research area: Information security, Tampere University of Technology
Contributors: Silverajan, B., Luoma, J., Vajaranta, M., Itäpuro, R.
Number of pages: 4
Pages: 786-789
Publication date: 29 Jun 2015

Host publication information

Title of host publication: Proceedings of the 2015 IFIP/IEEE International Symposium on Integrated Network Management, IM 2015
Publisher: IEEE
ISBN (Print): 9783901882760
ASJC Scopus subject areas: Software, Computer Science Applications, Computer Networks and Communications
Keywords: Cloud, Homenet, IoT, Network Management
Source: Scopus
Source ID: 84942601939

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

AvanTomography: A compact module for positron emission mammography

In AvanTomography project, a compact, high performance module was developed for axial positron emission mammography, which can be integrated with X-ray mammography. With its axial crystal orientation, AvanTomography can achieve a uniform spatial resolution and eliminate the parallax error by unambiguously detecting the location of the positron annihilation. Compact design of the module enables a cost and space efficient system for breast screening. Various configurations, plate or full ring, can be obtained by using multiple modules, allowing the screening of axillary and mammary regions with a single scanner position. In this project, a 6-module system was constructed and tested with a 22Na point source. Energy calibration was performed and initial measurements for energy resolution were conducted.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Augmented Human Activities (AHA), Department of Signal Processing, Department of Electronics and Communications Engineering, Research group: Personal Electronics Group, Research group: M2oBSI, Ghent University, Zwijnaarde, Belgium
Contributors: Us, D., Moreno-Galera, A., Nazari-Farsani, S., Palovuori, K., Kosola, H., Zedda, T., Ruotsalainen, U.
Number of pages: 6
Pages: 52-57
Publication date: 30 Jun 2015

Host publication information

Title of host publication: 2015 IEEE International Symposium on Medical Measurements and Applications, MeMeA 2015 - Proceedings
Publisher: IEEE
ISBN (Print): 9781479964765
ASJC Scopus subject areas: Biomedical Engineering, Computer Science Applications
Keywords: Axial geometry, breast cancer, LYSO, Positron Emission Mammography (PEM), Positron Emission Tomography (PET), pulse width conversion

Bibliographical note

ORG=sgn,0.5
ORG=elt,0.5
INT=sgn,"Zedda, T."

Source: Scopus
Source ID: 84939483539

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

A robust AMMI model for the analysis of genotype-by-environment data

Motivation: One of the most widely used models to analyse genotype-by-environment data is the additive main effects and multiplicative interaction (AMMI) model. Genotype-by-environment data resulting from multi-location trials are usually organized in two-way tables with genotypes in the rows and environments (location-year combinations) in the columns. The AMMI model applies singular value decomposition (SVD) to the residuals of a specific linear model, to decompose the genotype-by-environment interaction (GEI) into a sum of multiplicative terms. However, SVD, being a least squares method, is highly sensitive to contamination and the presence of even a single outlier, if extreme, may draw the leading principal component towards itself resulting in possible misinterpretations and in turn lead to bad practical decisions. Since, as in many other real-life studies the distribution of these data is usually not normal due to the presence of outlying observations, either resulting from measurement errors or sometimes from individual intrinsic characteristics, robust SVD methods have been suggested to help overcome this handicap. Results: We propose a robust generalization of the AMMI model (the R-AMMI model) that overcomes the fragility of its classical version when the data are contaminated. Here, robust statistical methods replace the classic ones to model, structure and analyse GEI. The performance of the robust extensions of the AMMI model is assessed through a Monte Carlo simulation study where several contamination schemes are considered. Applications to two real plant datasets are also presented to illustrate the benefits of the proposed methodology, which can be broadened to both animal and human genetics studies. Availability and implementation: Source code implemented in R is available in the supplementary material under the function r-AMMI.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Centro de Matemática e Aplicações (CMA, NOVA University of Lisbon
Contributors: Rodrigues, P. C., Monteiro, A., Lourenço, V. M.
Number of pages: 9
Pages: 58-66
Publication date: 1 Jul 2015
Peer-reviewed: Yes

Publication information

Journal: Bioinformatics
Volume: 32
Issue number: 1
ISSN (Print): 1367-4803
Ratings: 
  • Scopus rating (2015): CiteScore 6.06 SJR 4.97 SNIP 2.151
Original language: English
ASJC Scopus subject areas: Biochemistry, Molecular Biology, Computational Theory and Mathematics, Computer Science Applications, Computational Mathematics, Statistics and Probability, Medicine(all)
Source: Scopus
Source ID: 84959872026

Research output: Contribution to journalArticleScientificpeer-review

Prioritized centrally-controlled resource allocation in integrated multi-RAT HetNets

Given the importance of multi-radio heterogeneous networks (HetNets) in delivering more throughput and better connectivity experience to today's wireless users, we investigate the prioritized centrally-controlled resource allocation mechanisms in such systems. First, we theoretically formulate the problem of assisted rate allocation across multiple radio access technologies (RATs) as a special case of relative max-min fairness problem with bifurcated (splittable) traffic flows, which can then be solved by employing the standard linear optimization techniques. Our proposed solution delivers certain minimum guarantees to all the network users, while the rest of system resources are divided proportionally to the preset priority of the users. The priorities in our system may correspond to different subscription/pricing plans of a network operator. Finally, we demonstrate the practical benefits of the proposed resource allocation scheme with system-level simulations, as well as discuss its implementation within a testbed prototype based on the OpenFlow architecture.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Electronics and Communications Engineering, Tampere University of Technology, Research group: Emerging Technologies for Nano-Bio-Info-Cogno, Wireless Communications and Positioning (WICO), Intel Corporation
Contributors: Gerasimenko, M., Moltchanov, D., Florea, R., Himayat, N., Andreev, S., Koucheryavy, Y.
Number of pages: 7
Publication date: 1 Jul 2015

Host publication information

Title of host publication: IEEE Vehicular Technology Conference
Volume: 2015-July
Publisher: The Institute of Electrical and Electronics Engineers, Inc.
ISBN (Print): 9781479980888
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Applied Mathematics

Bibliographical note

AUX=elt,"Florea, Roman"

Source: Scopus
Source ID: 84940398708

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Railway fastener inspection by real-time machine vision

In this paper, a real-time railway fastener detection system using a high-speed laser range finder camera is presented. First, an extensive analysis of various methods based on pixel-wise and histogram similarities are conducted on a specific railway route. Then, a fusing stage is introduced which combines least correlated approaches also considering the performance upgrade after fusing. Then, the resulting method is tested on a larger database collected from a different railway route. After observing repeated successes, the method is implemented on NI LabVIEW and run real-time with a high-speed 3-D camera placed under a railway carriage designed for railway quality inspection.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Research group: Video, Middle East Technical University, Electrical and Electronics Engineering Department
Contributors: Aytekin, C., Rezaeitabar, Y., Dogru, S., Ulusoy, I.
Number of pages: 7
Pages: 1101-1107
Publication date: 1 Jul 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Systems, Man, and Cybernetics: Systems
Volume: 45
Issue number: 7
ISSN (Print): 1083-4427
Ratings: 
  • Scopus rating (2015): CiteScore 3.3 SJR 1.273 SNIP 2.189
Original language: English
ASJC Scopus subject areas: Computer Science Applications, Human-Computer Interaction, Software, Control and Systems Engineering, Electrical and Electronic Engineering
Keywords: High-speed laser range finder, railway fastener detection, railway inspection
Source: Scopus
Source ID: 84932638036

Research output: Contribution to journalArticleScientificpeer-review

Wideband self-adaptive RF cancellation circuit for full-duplex radio: Operating principle and measurements

This paper presents a novel RF circuit architecture for self-interference cancellation in inband full-duplex radio transceivers. The developed canceller is able to provide wideband cancellation with waveform bandwidths in the order of 100 MHz or beyond and contains also self-adaptive or self-healing features enabling automatic tracking of time-varying self-interference channel characteristics. In addition to architecture and operating principle descriptions, we also provide actual RF measurements at 2.4 GHz ISM band demonstrating the achievable cancellation levels with different bandwidths and when operating in different antenna configurations and under low-cost highly nonlinear power amplifier. In a very challenging example with a 100 MHz waveform bandwidth, around 41 dB total cancellation is obtained while the corresponding cancellation figure is close to 60 dB with the more conventional 20 MHz carrier bandwidth. Also, efficient tracking in time-varying reflection scenarios is demonstrated.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Electronics and Communications Engineering, Tampere University of Technology, Research group: Wireless Communications and Positioning, Wireless Communications and Positioning (WICO), Intel Corporation
Contributors: Huusari, T., Choi, Y. S., Liikkanen, P., Korpi, D., Talwar, S., Valkama, M.
Publication date: 1 Jul 2015

Host publication information

Title of host publication: 2015 IEEE 81st Vehicular Technology Conference (VTC Spring)
Publisher: The Institute of Electrical and Electronics Engineers, Inc.
ISBN (Print): 9781479980888
ASJC Scopus subject areas: Electrical and Electronic Engineering, Computer Science Applications, Applied Mathematics
Keywords: Full-duplex, RF cancellation, Self adaptive, Self interference, Tracking

Bibliographical note

AUX=elt,"Huusari, Timo"
AUX=elt,"Liikkanen, Petteri"

Source: Scopus
Source ID: 84940421784

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Effective variable switching point predictive current control for ac low-voltage drives

This paper presents an effective model predictive current control scheme for induction machines driven by a three-level neutral point clamped inverter, called variable switching point predictive current control. Despite the fact that direct, enumeration-based model predictive control (MPC) strategies are very popular in the field of power electronics due to their numerous advantages such as design simplicity and straightforward implementation procedure, they carry two major drawbacks. These are the increased computational effort and the high ripples on the controlled variables, resulting in a limited applicability of such methods. The high ripples occur because in direct MPC algorithms the actuating variable can only be changed at the beginning of a sampling interval. A possible remedy for this would be to change the applied control input within the sampling interval, and thus to apply it for a shorter time than one sample. However, since such a solution would lead to an additional overhead which is crucial especially for multilevel inverters, a heuristic preselection of the optimal control action is adopted to keep the computational complexity at bay. Experimental results are provided to verify the potential advantages of the proposed strategy.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Smart Energy Systems (SES), Technische Universitat Munchen, National Technical University of Athens, Technische Hochschule Ingolstadt
Contributors: Stolze, P., Karamanakos, P., Kennel, R., Manias, S., Endisch, C.
Number of pages: 13
Pages: 1366-1378
Publication date: 3 Jul 2015
Peer-reviewed: Yes

Publication information

Journal: International Journal of Control
Volume: 88
Issue number: 7
ISSN (Print): 0020-7179
Ratings: 
  • Scopus rating (2015): CiteScore 2.56 SJR 1.397 SNIP 1.351
Original language: English
ASJC Scopus subject areas: Control and Systems Engineering, Computer Science Applications
Keywords: ac low-voltage drives, model predictive control (MPC), optimal control, three-level inverter, variable switching point
Source: Scopus
Source ID: 84930755978

Research output: Contribution to journalArticleScientificpeer-review

Gathering useful programming data; Analysis and insights from real-time collaborative editing

Traditionally, collaborative coding has been practiced in open source communities where cooperation has mostly taken place on a coordination level. Nowadays, web technology is sufficiently advanced to enable collaborative coding in real-time as group work, which eases communication in software development. In this paper this phenomenon has been studied from a knowledge transfer and learning perspective. With the aid of two different example cases (code camps), we have examined the possibilities and challenges in learning during real-time group work. Additionally, we have evaluated the effect of the structure of log data created during software development. The research frame for this study is the utilization of log data visualization in evaluating group work and further improvement of the visualization in order to support software development.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Pori Department, Research group: Software Engineering and Intelligent Systems, Department of Pervasive Computing, Research area: Software engineering, Managing digital industrial transformation (mDIT)
Contributors: Rantala, M., Soini, J., Kilamo, T.
Number of pages: 6
Pages: 229-234
Publication date: 15 Jul 2015

Host publication information

Title of host publication: 2015 38th International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2015 - Proceedings
Publisher: The Institute of Electrical and Electronics Engineers, Inc.
Article number: 7160270
ISBN (Print): 9789532330854
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications, Hardware and Architecture, Electrical and Electronic Engineering

Bibliographical note

ORG=pla,0.7
ORG=tie,0.3

Source: Scopus
Source ID: 84946129499

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Stability-Guaranteed Force-Sensorless Contact Force/Motion Control of Heavy-Duty Hydraulic Manipulators

In this paper, a force-sensorless high-performance contact force/motion control approach is proposed for multiple-degree-of-freedom hydraulic manipulators. A rigorous stability proof for an entire hydraulic manipulator performing contact tasks is provided for the first time. The controller design for the manipulator is based on the recently introduced virtual decomposition control approach. As a significant novelty, the end-effector contact force is directly estimated from the manipulator's cylinder pressure data, which provides a practical solution for heavy-duty contact force control without engaging fragile force/torque sensors. In the experiments, the proposed controller achieved a force control accuracy of 4.1% at a desired contact force of 8000 N while in motion. This can be considered a significant result due to the hydraulic actuators' highly nonlinear behaviors, the coupled mechanical linkage dynamics, and the complex interaction dynamics between the manipulator and the environment.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Intelligent Hydraulics and Automation, Research group: Mobile manipulation, Field robotics for efficient work sites (FIRE)
Contributors: Koivumäki, J., Mattila, J.
Number of pages: 18
Pages: 918-935
Publication date: 1 Aug 2015
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Robotics
Volume: 31
Issue number: 4
ISSN (Print): 1552-3098
Ratings: 
  • Scopus rating (2015): CiteScore 4.86 SJR 2.271 SNIP 2.772
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering, Control and Systems Engineering, Computer Science Applications
Keywords: Contact force estimation, contact force/motion control, hydraulic manipulators, nonlinear model-based control, stability analysis, virtual decomposition control (VDC)

Research output: Contribution to journalArticleScientificpeer-review

Image interpolation based on non-local geometric similarities

Image interpolation refers to constructing a high-resolution (HR) image from a low-resolution (LR) image. Traditionally, an HR image can be produced from an observed LR image via the polynomial-based interpolation (bi-linear or bi-cubic interpolations, involving a small number of neighbors around each interpolated position). The advanced interpolation makes use of the so-called 'geometric similarity' to design a set of optimal interpolation weighting coefficients. However, better geometric similarities can perhaps be found from a non-local area within the LR source image or even from other but similar images (possibly with higher resolutions). Based on this fact, we propose in this paper a non-local geometric similarity based interpolation scheme to construct HR images. In our proposed method, optimal weighting coefficients are determined by solving a regularized least squares problem which is built upon a number of dual reference patches drawn from the observed LR image and regularized by the variation of directional gradients of the image patch. Experimental results demonstrate that our proposed method offers a remarkable quality improvement, both objectively and subjectively.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Department of Signal Processing, Research group: Video, Research Community on Data-to-Decision (D2D), University of Electronic Science and Technology of China, University of Science and Technology of China
Contributors: Zhu, S., Zeng, B., Liu, G., Zeng, L., Fang, L., Gabbouj, M.
Publication date: 4 Aug 2015

Host publication information

Title of host publication: 2015 IEEE International Conference on Multimedia and Expo (ICME)
Publisher: IEEE COMPUTER SOCIETY PRESS
ISBN (Print): 9781479970827
ASJC Scopus subject areas: Computer Networks and Communications, Computer Science Applications
Keywords: geometric similarity, Image interpolation, regularization, weighting coefficients
Source: Scopus
Source ID: 84946043968

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Distance-based human action recognition using optimized class representations

We study distance-based classification of human actions and introduce a new metric learning approach based on logistic discrimination for the determination of a low-dimensional feature space of increased discrimination power. We argue that for effective distance-based classification, both the optimal projection space and the optimal class representation should be determined. We qualitatively and quantitatively illustrate the superiority of the proposed approach to metric learning approaches employing the class mean for class representation. We also introduce extensions of the proposed metric learning approach to allow for richer class representations and to operate in arbitrary-dimensional Hilbert spaces for non-linear feature extraction and classification. Experimental results denote that the performance of the proposed distance-based classification schemes is comparable (or even better) to that of Support Vector Machine classifier (in both the linear and kernel cases) which is currently the standard choice for human action recognition.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research Community on Data-to-Decision (D2D), Aristotle University of Thessaloniki, Department of Informatics
Contributors: Iosifidis, A., Tefas, A., Pitas, I.
Number of pages: 9
Pages: 47-55
Publication date: 5 Aug 2015
Peer-reviewed: Yes

Publication information

Journal: Neurocomputing
Volume: 161
ISSN (Print): 0925-2312
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