First principles prediction of the solar cell efficiency of chalcopyrite materials  AgMX2(M=In, Al; X=S, Se, Te)

Using the spectroscopic limited maximum efficiency, and Shockley and Queisser predictor models, we compute the solar efficiency of the chalcopyrites AgMX 2 (M = In, Al; X = S, Se, Te). The results presented are based on the estimation of the electronic and optical properties obtained from first principles density functional theory as well as the many-body perturbation theory calculations. The results from this report were consistent with the experimental data.The optical bandgap was accurately estimated from the absorption spectra, obtained by solving the Bethe and Salpeter equation. Fitting the Tauc's plot on the absorption spectra, we also predicted that the materials studied have a direct allowed optical transition. The theoretical estimations of the solar cell performance showed that the efficiencies from the Shockley and Queisser model are higher than those from the spectroscopic limited maximum efficiency model. This improvement is attributed to the absorption, the recombination processes and the optical transition accounted in the calculation of the efficiency.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Electrical Engineering, University of South Africa, University of Witwatersrand
Contributors: Dongho-Nguimdo, G. M., Igumbor, E., Zambou, S., Joubert, D. P.
Publication date: 1 Dec 2019
Peer-reviewed: Yes

Publication information

Journal: Computational Condensed Matter
Volume: 21
Article number: e00391
ISSN (Print): 2352-2143
Original language: English
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Materials Science (miscellaneous), Condensed Matter Physics, Materials Chemistry
Keywords: Chalcopyrites, First principles, Solar cell efficiency
Source: Scopus
Source ID: 85065198754

Research output: Contribution to journalArticleScientificpeer-review

DroneRF dataset: A dataset of drones for RF-based detection, classification and identification

Modern technology has pushed us into the information age, making it easier to generate and record vast quantities of new data. Datasets can help in analyzing the situation to give a better understanding, and more importantly, decision making. Consequently, datasets, and uses to which they can be put, have become increasingly valuable commodities. This article describes the DroneRF dataset: a radio frequency (RF) based dataset of drones functioning in different modes, including off, on and connected, hovering, flying, and video recording. The dataset contains recordings of RF activities, composed of 227 recorded segments collected from 3 different drones, as well as recordings of background RF activities with no drones. The data has been collected by RF receivers that intercepts the drone's communications with the flight control module. The receivers are connected to two laptops, via PCIe cables, that runs a program responsible for fetching, processing and storing the sensed RF data in a database. An example of how this dataset can be interpreted and used can be found in the related research article “RF-based drone detection and identification using deep learning approaches: an initiative towards a large open source drone database” (Al-Sa'd et al., 2019).

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Computing Sciences, Qatar University
Contributors: Allahham, M. S., Al-Sa'd, M. F., Al-Ali, A., Mohamed, A., Khattab, T., Erbad, A.
Publication date: 1 Oct 2019
Peer-reviewed: Yes

Publication information

Journal: Data in Brief
Volume: 26
Article number: 104313
ISSN (Print): 2352-3409
Original language: English
ASJC Scopus subject areas: General
Keywords: Anti-drone systems, Classification, Drone identification, UAV detection
Source: Scopus
Source ID: 85071552598

Research output: Contribution to journalArticleScientificpeer-review

Automatization and stress analysis data of CoCr laser weld fatigue tests

This work includes raw and analyzed test data when using a recently developed fatigue test method for miniature laser welds in cobalt-chromium (CoCr) alloy joints [1]: 10.1016/j.jmbbm.2019.07.004. The automization of fatigue tests is crucial for saving costs and personnel resources and that is the reason why the atomization threshold and the resulting spectrum data related to CoCr welds are provided here. The finite element method based stress computation output is provided related to shearing-mode tests to support the dataset as a whole. In addition, the compositional data of the parent material and the laser weld are given.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Materials Science and Environmental Engineering, Research group: Plastics and Elastomer Technology, Orton Orthopaedic Hospital, Surface and Corrosion Science
Contributors: Kanerva, M., Besharat, Z., Pärnänen, T., Jokinen, J., Honkanen, M., Sarlin, E., Göthelid, M., Schlenzka, D.
Publication date: 1 Oct 2019
Peer-reviewed: Yes

Publication information

Journal: Data in Brief
Volume: 26
Article number: 104374
ISSN (Print): 2352-3409
Original language: English
ASJC Scopus subject areas: General
Keywords: Automatization, CoCr, Fatigue, Laser, Testing, Welding

Bibliographical note

EXT="Pärnänen, T."

Source: Scopus
Source ID: 85072173471

Research output: Contribution to journalArticleScientificpeer-review

Teacher’s Perceptions and Readiness to Teach Coding Skills: A Comparative Study Between Finland, Mainland China, Singapore, Taiwan, and South Korea

Many education systems have recognized the importance of computational thinking and coding skills and are implementing curricular changes to introduce coding into formal school education. A necessary and critical success factor involves the preparation of and support for teachers to teach coding. Thus, understanding the perceptions of teachers towards coding is most important, together with knowing the kinds of support they received, and their readiness and challenges to teach. The purpose of the current study is to compare teachers’ attitudes towards the importance of information and communications technologies (ICT) skills and coding skills in Finland, Mainland China, Singapore, Taiwan, and South Korea. The findings indicate that teachers in Finland, Singapore, Taiwan, and South Korea believe that coding is useful even if students will not work in ICT jobs while Mainland Chinese teachers are undecided. Mainland China, Singapore, Taiwan, and South Korea have more positive views towards how to prepare for future-ready learners.

General information

Publication status: E-pub ahead of print
MoE publication type: A1 Journal article-refereed
Organisations: Computing Sciences, National Institute of Education, Satakunta University of Applied Sciences, Chuncheon National University of Education, Taiwan Normal University
Contributors: Wu, L., Looi, C. K., Multisilta, J., How, M. L., Choi, H., Hsu, T. C., Tuomi, P.
Number of pages: 14
Publication date: 30 Sep 2019
Peer-reviewed: Yes

Publication information

Journal: Asia-Pacific Education Researcher
ISSN (Print): 0119-5646
Original language: English
ASJC Scopus subject areas: Education
Keywords: Attitudes, Coding skills, Comparative research, Computational thinking, Primary school, Twenty first century skills

Bibliographical note

EXT="Multisilta, Jari"

Source: Scopus
Source ID: 85074064375

Research output: Contribution to journalArticleScientificpeer-review

Diffusion of innovation: Case of co-design of cabins in mobile work machine industry

This paper describes the development of using virtual reality for work content in one application area over a decade. Virtual reality technology has developed rapidly; from walk-in CAVE-like virtual environments to head-mounted displays within a decade. In this paper, the development is studied through the lens of diffusion of innovation theory, which focuses not only on innovation itself, but also on the social system. The development of virtual technology is studied by one case, which is cabin design in the mobile work machine industry. This design process has been especially suitable for using virtual reality technology.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Automation Technology and Mechanical Engineering, Tampere University
Contributors: Ellman, A., Tiainen, T.
Publication date: 1 Jun 2019
Peer-reviewed: Yes

Publication information

Journal: Computers
Volume: 8
Issue number: 2
Article number: 39
ISSN (Print): 2073-431X
Original language: English
ASJC Scopus subject areas: Human-Computer Interaction, Computer Networks and Communications
Keywords: Cabin design, Diffusion of innovation, Virtual reality
Electronic versions: 
Source: Scopus
Source ID: 85069801135

Research output: Contribution to journalArticleScientificpeer-review

Accurate impedance model of grid-connected inverter for small-signal stability assessment in high-impedance grid

General information

Publication status: Accepted/In press
MoE publication type: A1 Journal article-refereed
Organisations: Electrical Engineering, Research area: Power engineering, Research group: Power electronics, Automation Technology and Mechanical Engineering, Research group: Automation and Systems Theory
Contributors: Messo, T., Roinila, T., Aapro, A., Luhtala, R.
Publication date: 1 Feb 2019
Peer-reviewed: Yes

Publication information

Journal: IEEJ JOURNAL OF INDUSTRY APPLICATIONS
Volume: 8
Issue number: 3
Article number: 3
ISSN (Print): 2187-1094
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Modelling the stressed skin effect by using shell elements with meta-material model

It is a well-known fact that the so-called stressed skin design results in ca. 10-20 % mass and cost savings in a typical steel hall structures. The potential of this design method is however, too often disregarded due to e.g. rather complex and limited existing design rules and instructions. In this paper, a method for determination of generalized elastic parameters is proposed, so that the stressed skin can be modelled in the general finite element software using existing elements and material parameters. With the proposed method, structural designer can take advantage of the stressed skin design in the context of basic design tools as Autodesk Robot or RFEM.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering, Sorvimo Optimointipalvelut Oy
Contributors: Pajunen, S., Hautala, J., Heinisuo, M.
Number of pages: 10
Pages: 20-29
Publication date: 2019
Peer-reviewed: Yes

Publication information

Journal: Magazine of Civil Engineering
Volume: 86
Issue number: 2
ISSN (Print): 2071-4726
Original language: English
ASJC Scopus subject areas: Civil and Structural Engineering, Building and Construction
Keywords: Corrugated sheet, Diaphragm, Stressed skin
Electronic versions: 

Bibliographical note

EXT="Heinisuo, M."

Source: Scopus
Source ID: 85068566348

Research output: Contribution to journalArticleScientificpeer-review

Experimental moment resistance of rectangular hollow section T joints

Resistance is the main property of tubular joints. The determination of the joint resistance from the experimental load-deformation curve always represents a challenging task. Currently there are two main methods to find the experimental resistance, which are called plastic and ultimate resistance. However, there is no single opinion on which one should be commonly used. Based on the experimental results, this paper directly compares the two existed approaches. The study is restricted to welded square hollow section T joints under in-plane bending moment. The paper considers only the joints with β < 0.85, i.e. when the behaviour of the joint is governed by chord face failure. The results show that plastic resistance leads to more conservative results than ultimate resistance, providing thus safer results. However, attention should be also paid to the difference between the labour intensity of the presented methods.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering
Contributors: Garifullin, M.
Publication date: 5 Dec 2018
Peer-reviewed: Yes

Publication information

Journal: MATEC Web of Conferences
Volume: 245
Article number: 08003
ISSN (Print): 2274-7214
Ratings: 
  • Scopus rating (2018): CiteScore 0.42 SJR 0.169 SNIP 0.548
Original language: English
ASJC Scopus subject areas: Chemistry(all), Materials Science(all), Engineering(all)
Electronic versions: 
Source: Scopus
Source ID: 85058463414

Research output: Contribution to journalConference articleScientificpeer-review

Tutkimuskatsaus: Uusia menetelmiä haavan paranemisen arviointiin ja seurantaan

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Faculty of Biomedical Sciences and Engineering, Turku Univ Hosp, University of Turku, Åbo Akademi
Contributors: Kekonen, A., Bergelin, M., Viik, J.
Number of pages: 3
Pages: 30-32
Publication date: 20 Oct 2018
Peer-reviewed: Yes

Publication information

Journal: HAAVA
Volume: 20
Issue number: 3
ISSN (Print): 1456-3037
Original language: Finnish
ASJC Scopus subject areas: Biomedical Engineering, Dermatology

Research output: Contribution to journalArticleScientificpeer-review

Evaluation of Median Root Prior for Robust In-Beam PET Reconstruction

Dose delivery verification in proton beam radiotherapy is used to ensure the delivery of the dose to the correct location. A positron emission tomography (PET) scanner can be used to detect the secondary radiation during the treatment, so-called in-beam PET. This is a challenging application for PET due to the low counts and limited angular coverage. We propose a maximum a posteriori (MAP) reconstruction with median root prior (MRP) for the reconstruction of in-beam PET data. The proposed method was compared against MAP with total variation (TV) prior and maximum likelihood expectation maximization (MLEM), which have previously been used for this application. The effects of different ring configurations and time-of-flight information were tested with simulations of a geometrical phantom and a realistic patient treatment plan. The results indicate that both MAP methods produced sharper edges than MLEM, allowing more accurate edge localization in the reconstructed images. Even for the partial ring configurations, no elongation was observed with MAP methods. MAP-MRP successfully reduced the noise, whereas MAP-TV resulted in checkerboard artifacts. MAP-MRP was also more stable against the selection of the reconstruction parameters. In conclusion, MAP-MRP offers a simple and robust alternative for the reconstruction of in-beam PET data.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematics, Signal Processing, Research group: M2oBSI, University of Groningen
Contributors: Us, D., Brzezinski, K., Buitenhuis, T., Dendooven, P., Ruotsalainen, U.
Number of pages: 8
Pages: 490-498
Publication date: 5 Sep 2018
Peer-reviewed: Yes

Publication information

Journal: IEEE Transactions on Radiation and Plasma Medical Sciences
Volume: 2
Issue number: 5
ISSN (Print): 2469-7303
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Effect of radiation inside square hollow section under moderate non-symmetric fire

The temperature calculation of hollow steel sections at elevated temperatures is a well-documented and standard procedure. Through this standard procedure, the temperature can be calculated by assuming a uniform gas temperature all around the section, which is called a symmetric fire in this paper. Embedding in surrounding structures or connecting to another steel member results in non-symmetric heat distribution in the member. This non-symmetricity of the surrounding temperature may cause surface-to-surface heat radiation inside the
member, thus affecting the steel section temperature distribution. This effect is considered in this paper by adopting analytical and finite element method analysis.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering, Research group: Metal and Light-wight structures, Research group: Metal and Light-wight structures
Contributors: Baczkiewicz, J., Pajunen, S., Heinisuo, M.
Number of pages: 6
Pages: 25-30
Publication date: 27 Jul 2018
Peer-reviewed: Yes

Publication information

Journal: Fire Research
Volume: 2
Issue number: 1
Article number: 2:42
ISSN (Print): 2532-4748
Original language: English
Keywords: Steel member, Hollow section, Heat transfer, Radiation

Research output: Contribution to journalArticleScientificpeer-review

Effect of elevated nitrate and sulfate concentrations on selenate removal by mesophilic anaerobic granular sludge bed reactors

Simultaneous removal of selenate (SeO42-), nitrate (NO3-) and sulfate (SO42-), typically present in Se-contaminated wastewaters, by Eerbeek anaerobic granular sludge, was investigated in batch and continuous bioreactor experiments. Batch experiments showed that SeO42- removal was enhanced to 91% in simulated wastewater with SeO42- + NO3- + SO42- (1 : 40 : 100 SeO42- : NO3- : SO42- molar ratios) compared to simulated wastewater with SeO42- alone (67%). SeO42- removal was severely impacted by high concentrations of SO42- (SeO42- : SO42- > 1 : 300). Removal of SeO42-, NO3- and SO42- at a 1 : 40 : 100 ratio was studied in a 2 L lab-scale upflow anaerobic sludge blanket (UASB) reactor operated at 20 [degree]C, a 24 h hydraulic retention time and a 2 g COD L-1 day-1 organic loading rate using lactate as the electron donor. The removal efficiencies were stabilized at 100, 30 and 80% for NO3-, SO42- and total Se, respectively, during 92 days of UASB operation. The total Se removal efficiencies dropped to 47% or even to a negative value when, respectively, SO42- and NO3- were sequentially excluded from the influent. Speciation of Se, particularly the microbial production of colloidal Se0 levels, was influenced by both SO42- and NO3-. The results presented here demonstrate that UASB reactors are capable of removing SeO42- in the presence of millimolar concentrations of NO3- and SO42- typically found in Se-contaminated wastewaters.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Chemistry and Bioengineering, UNESCO-IHE Institute for Water Education
Contributors: Tan, L. C., Nancharaiah, Y. V., van Hullebusch, E. D., Lens, P. N. L.
Pages: 303-314
Publication date: 2018
Peer-reviewed: Yes
Early online date: 5 Dec 2017

Publication information

Journal: Environmental Science: Water Research & Technology
Volume: 4
Issue number: 2
ISSN (Print): 2053-1400
Ratings: 
  • Scopus rating (2018): CiteScore 4.02 SJR 1.104 SNIP 1.081
Original language: English
Source: Bibtex
Source ID: urn:83b997c5e222c3328f8a2e876e3d3da8

Research output: Contribution to journalArticleScientificpeer-review

In vitro characterization of arylhydrazones of active methylene derivatives

Arylhydrazones of active methylene compounds (AHAMCs) are potent chemotherapy agents for the cancer treatment. AHAMCs enhance the apoptotic cell death and antiproliferation properties in cancer cells. In this study, a series of AHAMCs, 13 compounds, was assayed for cytotoxicity, apoptosis, externalization of phosphatidylserine, heterogeneity and cellular calcium level changes. The in vitro cytotoxicity study against HEK293T cells suggests that AHAMCs have significant cytotoxic effect over the concentrations. Top 5 compounds, 5-(2-(2-hydroxyphenyl) hydrazono)pyrimidine-2,4,6(1H,3H,5H)-trione (5), 4-hydroxy-5-(2-(2,4,6-trioxo-tetrahydro-pyrimidin-5(6H) ylidene)hydrazinyl)benzene-1,3-disulfonic acid (6), 5-chloro-3-(2-(4,4-dimethyl-2,6-dioxocyclohexylidene)hydrazinyl)-2-hydroxybenzenesulfonic acid (8), 5-(2-(4,4-dimethyl-2,6-dioxocyclohexylidene)hydrazinyl)-4-hydroxybenzene-1,3-disulfonic acid (9) and 2-(2-sulfophenylhydrazo)malononitrile (10) were chosen for the pharmacodynamics study. Among these, compound 5 exhibited the better cytotoxic effect with the IC50 of 50.86 ± 2.5 mM. DNA cleavage study revealed that 5 induces cell death through apoptosis and shows more effects after 24 and/or 48 h. Independent validation of apoptosis by following the externalization of phosphatidylserine using Annexin-V is also in agreement with the potential activity of 5. Single cell image analysis of Annexin-V bound cells confirms the presence of mixture of early, mid and late apoptotic cells in the population of the cells treated with 5 and a decreased trend in cell-to-cell variation over the phase was also identified. Additionally, intracellular calcium level measurements identified the Ca2+ up-regulation in compound treated cells. A brief inspection of the effect of the compound 5 against multiple human brain astrocytoma cells showed a better cell growth inhibitory effect at micro molar level. These systematic studies provide insights in the development of novel AHAMACs compounds as potential cell growth inhibitors for cancer treatment.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Computational Systems Biology, Peoples’ Friendship University of Russia, Baku State University, Centro de Quimica Estrutural at Instituto Superior Tecnico
Contributors: Palanivel, S., Zhurina, A., Doan, P., Chandraseelan, J. G., Khandelwal, V. K. M., Zubkov, F. I., Mahmudov, K. T., Pombeiro, A. J., Yli-Harja, O., Kandhavelu, M.
Pages: 430-436
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: Saudi Pharmaceutical Journal
Volume: 26
Issue number: 3
ISSN (Print): 1319-0164
Ratings: 
  • Scopus rating (2018): CiteScore 3.48 SJR 0.67 SNIP 1.925
Original language: English
ASJC Scopus subject areas: Pharmacology, Pharmaceutical Science
Keywords: Apoptosis, Arylhydrazones of active methylene compounds, Chemotherapy, Cytotoxic effect, Glioma, Immortal cells, Single cell analysis
Electronic versions: 
Source: Scopus
Source ID: 85039901326

Research output: Contribution to journalArticleScientificpeer-review

Cold-formed RHS T joints with initial geometrical imperfections

Generally, numerical simulations of structures are carried out in such a way as to most accurately repeat their real behavior. The current rules for finite element modeling of tubular joints oblige scientists and engineers to construct their numerical models considering initial imperfections. However, not all joints are sensitive to initial imperfections. Often consideration of initial imperfections brings no reasonable improvements in the accuracy of results, but severely complicates numerical simulations. In such cases, the effect of geometrical imperfections can be effectively replaced by a simple theoretical equation or neglected entirely. This paper evaluates the effect of initial geometrical imperfections on the structural behavior of cold-formed rectangular hollow section T joints. Imperfections are simulated using the conventional approach for thin-walled structures, applying corresponding buckling modes to the perfect geometry. The paper analyzes several buckling modes and their combinations to identify the most rational technique for simulation of imperfections under in-plane bending and axial loading. Based on the obtained results, parametric studies are conducted to investigate the effect of initial imperfections on joints with various geometry and material properties. The results demonstrate that initial imperfections reduce the resistance and initial stiffness of joints. However, the observed effect has been found sufficiently small to be safely ignored in computational analyses.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering, St. Petersburg State Polytechnical University
Contributors: Garifullin, M., Bronzova, M. K., Heinisuo, M., Mela, K., Pajunen, S.
Number of pages: 14
Pages: 81-94
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: Magazine of Civil Engineering
Volume: 80
Issue number: 4
ISSN (Print): 2071-4726
Ratings: 
  • Scopus rating (2018): CiteScore 2.75 SJR 1.062 SNIP 2.28
Original language: English
ASJC Scopus subject areas: Civil and Structural Engineering, Building and Construction
Keywords: Finite element analysis, Hollow section joint, Imperfection, Initial stiffness, Resistance
Electronic versions: 
Source: Scopus
Source ID: 85051540096

Research output: Contribution to journalArticleScientificpeer-review

基于相位旋转的SCMA码本优化方法

To solve the high bit error ratio (BER) problem under the condition of high overload of sparse code multiple access (SCMA), the influence of phase rotation on the SCMA code is studied firstly. Two schemes of optimizing the phase rotation angle are then proposed based on the controlled-distance among the constellation points of synthetic constellation. The first scheme is called the rotation based on maximizing minimum euclidean distance (M-rotation) and the second is the rotation based on exponential average (E-rotation). E-rotation achieves better BER performance than M-rotation, but M-rotation is outstanding at the case of high signal-to-noise ratio (SNR). With respect to the decoding complexity, both schemes have no distinction but E-rotation gets better performance than M-rotation when the partial extrinsic information transmission of MPA (PEIT-MPA) is adopted.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Electronics and Communications Engineering, Chongqing University of Posts and Telecommunications, Huawei Technologies Co., Ltd.
Contributors: Shao, K., Zhou, B., Wang, G., Yu, B.
Number of pages: 9
Pages: 2354-2362
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: Xi Tong Gong Cheng Yu Dian Zi Ji Shu/Systems Engineering and Electronics
Volume: 40
Issue number: 10
ISSN (Print): 1001-506X
Ratings: 
  • Scopus rating (2018): CiteScore 0.58 SJR 0.198 SNIP 0.446
Original language: Chinese
ASJC Scopus subject areas: Control and Systems Engineering, Electrical and Electronic Engineering
Keywords: Codebook design, Phase rotation, Sparse code multiple access (SCMA), Synthetic constellation
Source: Scopus
Source ID: 85056877151

Research output: Contribution to journalArticleScientificpeer-review

Core Project Team As a Management Entity for Construction Projects

The complexity of constructed facilities and the high degree of specialisation in design and construction generates very fragmented working environment for the construction project. Construction project organisations are built up from the units of organisations and they have arranged rules and procedures about how practicalities are to be done. A current perception of construction management is widely built around power, authority, and task orientation. This is resulting from the traditional focus of the construction industry on the technical and managerial features of construction projects. Organisations of construction projects vary substantially in their structure and this structure has considerable consequences to outcomes. Therefore, project management professionals continuously seek and establish new organisational and management structures and linkages to facilitate imperative cooperation between people and project partners. New understanding and amendments are broadening the content of construction project management and have provided new insights for successful construction operations. This paper is based on research according to this continuum by having focus on the appearances of management entity of a new kind, its significance and roles as a part of construction project management. The paper sought to summarize this literature and the survey study by focusing on the project management entity “core project team”, later “core team”. Drawing from this inclusive, the phenomenon of core team, the authors approach the field through six attributes, which have been selected to describe the new way for organising project management.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering, Research group: Digitalization in the real estate and construction sector
Contributors: Keinänen, M., Kähkönen, K.
Number of pages: 10
Pages: 208-217
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: In_bo: Ricerche e progetti per il territorio, la citta e l'architettura. Construction Management
Volume: 9
Issue number: 13
ISSN (Print): 2036-1602
Original language: English
ASJC Scopus subject areas: Civil and Structural Engineering
Keywords: Core project team, Core team, Construction management, Construction project, Construction teams

Research output: Contribution to journalArticleScientificpeer-review

Kehittämistutkimus: vuorovaikutteisten Matlab-opetusohjelmien vaikutus minäpystyvyyteen ja oppimistuloksiin yliopistomatematiikassa

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematics, Research group: Computer Science and Applied Logics, Research group: Positioning
Contributors: Kaarakka, T. E., Ali-Löytty, S., Huhtanen, M.
Number of pages: 11
Pages: 67-77
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: FMSERA Journal
Volume: 2
Issue number: 1
ISSN (Print): 2489-4583
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Yliopistomatematiikan sähköisten tehtävien ja matemaattisen ajattelun kehittäminen

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematics, Research group: Positioning, Research group: Computer Science and Applied Logics
Contributors: Myllykoski, T. J., Mattila, P., Ali-Löytty, S., Kaarakka, T., Viro, E.
Number of pages: 11
Pages: 46-56
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: FMSERA Journal
Volume: 2
Issue number: 1
ISSN (Print): 2489-4583
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Projektityöskentelyn kehittäminen yläkoulun matematiikan opetuksessa

Perusopetuksen opetussuunnitelman perusteiden 2014 aikana ovat ilmiölähtöinen oppiminen ja projektiluontoinen työskentely lisääntyneet peruskouluissa merkittävästi. Tässä tutkimuksessa tarkastellaan oppilaan ja opettajan näkökulmasta lähinnä yläkoulun matematiikan opetukseen liitetyn projektityöskentelyn kehittämiskohteita sekä niihin mahdollisia kehittämisehdotuksia. Tutkimusaineistoa on kerätty kyselylomakkeilla ja havainnoinnilla LUMA Suomen Projektioppiminen-kehittämishankkeesta, StarT-projektikilpailusta ja Teknologiateollisuuden My TecH –ohjelmasta. Tutkimukseen osallistui 365 oppilasta ja 19 opettajaa. Projektityöskentelyn suurimmat haasteet voidaan luokitella oppilaan ja opettajan toimintaan, itse projektiin tai koulutoiminnan puitteisiin liittyviksi. Jokaiseen osa-alueeseen opettaja voi omalla toiminnallaan vaikuttaa.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Mathematics, Tampereen yliopisto
Contributors: Viro, I. E., Joutsenlahti, J.
Number of pages: 10
Pages: 90-99
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: FMSERA Journal
Volume: 2
Issue number: 1
ISSN (Print): 2489-4583
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Analysis of outdoor and indoor propagation at 15 GHz and millimeter wave frequencies in microcellular environment

The main target of this article is to perform the multidimensional analysis of multipath propagation in an indoor and outdoor environment at higher frequencies i.e. 15 GHz, 28 GHz and 60 GHz, using “sAGA” a 3D ray tracing tool. A real world outdoor Line of Sight (LOS) microcellular environment from the Yokusuka city of Japan is considered for the analysis. The simulation data acquired from the 3D ray tracing tool includes the received signal strength, power angular spectrum and the power delay profile. The different propagation mechanisms were closely analyzed. The simulation results show the difference of propagation in indoor and outdoor environment at higher frequencies and draw a special attention on the impact of diffuse scattering at 28 GHz and 60 GHz. In a simple outdoor microcellular environment with a valid LOS link between the transmitter and a receiver, the mean received signal at 28 GHz and 60 GHz was found around 5.7 dB and 13 dB inferior in comparison with signal level at 15 GHz. Whereas the difference in received signal levels at higher frequencies were further extended in an indoor environment due to higher building penetration loss. However, the propagation and penetration loss at higher frequency can be compensated by using the antenna with narrow beamwidth and larger gain.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Electrical Engineering, Research group: Laboratory of Radio Network Planning, Research group: Wireless Communications and Positioning
Contributors: Sheikh, M. U., Lempiainen, J.
Number of pages: 8
Pages: 160-167
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: Advances in Science, Technology and Engineering Systems
Volume: 3
Issue number: 1
ISSN (Print): 2415-6698
Original language: English
ASJC Scopus subject areas: Engineering (miscellaneous), Management of Technology and Innovation, Physics and Astronomy (miscellaneous)
Keywords: 3D ray tracing, 5G, Microcellular, Millimeter wave frequencies, Multipath propagation, System performance
Source: Scopus
Source ID: 85061718805

Research output: Contribution to journalArticleScientificpeer-review

Enhanced outdoor to indoor propagation models and impact of different ray tracing approaches at higher frequencies

The main target of this article is to study the provision of indoor service (coverage) using outdoor base station at higher frequencies i.e. 10 GHz, 30 GHz and 60 GHz. In an outdoor to indoor propagation, an angular wall loss model is used in the General Building Penetration (GBP) model for estimating the additional loss at the intercept point of the building exterior wall. A novel angular wall loss model based on a separate incidence angle in azimuth and elevation plane is proposed in this paper. In the second part of this study, an Extended Building Penetration (EBP) model is proposed, and the performance of EBP model is compared with the GBP model. In EBP model, the additional fifth path known as the “Direct path” is proposed to be included in the GBP model. Based on the evaluation results, the impact of the direct path is found significant for the indoor users having the same or closed by height as that of the height of the transmitter. For the indoor users located far away from the exterior wall of building, a modified and enhanced approach of ray tracing type is proposed in this article. In the light of acquired simulation results, the impact of a modified ray tracing approach is emphasized.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Electrical Engineering, Research group: Laboratory of Radio Network Planning, Research group: Wireless Communications and Positioning, Ericsson Research
Contributors: Sheikh, M. U., Hiltunen, K., Lempiainen, J.
Number of pages: 11
Pages: 58-68
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: Advances in Science, Technology and Engineering Systems
Volume: 3
Issue number: 2
ISSN (Print): 2415-6698
Original language: English
ASJC Scopus subject areas: Engineering (miscellaneous), Management of Technology and Innovation, Physics and Astronomy (miscellaneous)
Keywords: Angular loss, Building penetration loss, Outdoor to indoor, Propagation, Ray tracing, Wall loss model
Source: Scopus
Source ID: 85061801748

Research output: Contribution to journalArticleScientificpeer-review

Electro-optic steering of random laser emission in liquid crystals

Using an external low-frequency electric field applied to dye-doped nematic liquid crystals, we demonstrate that random lasing obtained by optical pumping can be steered in an angular direction by routing an all-optical waveguide able to collect the emitted light. By varying the applied voltage from 0 to 2 V, we reduce the walk-off and sweep the random laser guided beam over 7 degrees.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Physics, Research group: Nonlinear Optics, University of Rome Roma Tre, University “Roma Tre”
Contributors: Assanto, G., Perumbilavil, S., Piccardi, A., Kauranen, M.
Number of pages: 3
Pages: 103-105
Publication date: 2018
Peer-reviewed: Yes

Publication information

Journal: Photonics Letters of Poland
Volume: 10
Issue number: 4
ISSN (Print): 2080-2242
Ratings: 
  • Scopus rating (2018): CiteScore 0.52 SJR 0.214 SNIP 0.348
Original language: English
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials
Source: Scopus
Source ID: 85062032353

Research output: Contribution to journalArticleScientificpeer-review

Assessing the usefulness of an early idea development tool among experienced researchers

We test a novel ideation tool developed for early idea development among experienced academic researchers. We presented the
Impact Canvas® tool to experienced researchers who assessed the usefulness of the tool in early idea development. This paper analyses
their perceptions of the tool: its usability and visual appeal, content elements, ability to facilitate collaboration and motivate them
personally. Our findings imply that the employment background of experienced researchers has an impact on how useful they consider
the tool. Researchers with a background in the public sector appreciate the tool significantly more than researchers who do not have
similar working experiences.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Industrial and Information Management, Research group: Center for Innovation and Technology Research, Innovation Services, Research Services, University of Tampere
Contributors: Saari, U., Aarikka-Stenroos, L., Boedeker, S., Köppä, L., Langwaldt, J.
Number of pages: 6
Pages: 3-8
Publication date: 22 Dec 2017
Peer-reviewed: Yes

Publication information

Journal: CERN IdeaSquare Journal of Experimental Innovation
Volume: 1
Issue number: 2
ISSN (Print): 2413-9505
Original language: English
Keywords: Canvas tool, Early idea development, Ideation process, Ideation tool
Electronic versions: 

Research output: Contribution to journalArticleScientificpeer-review

Sata vuotta vesihuoltoa Suomessa

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering
Contributors: Juuti, P., Katko, T. S., Rajala, R.
Number of pages: 3
Pages: 13-15
Publication date: Dec 2017
Peer-reviewed: Yes

Publication information

Journal: Vesitalous
Volume: 58
Issue number: 6
ISSN (Print): 0505-3838
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Probabilistic Mapping of Human Visual Attention from Head Pose Estimation

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Automation and Hydraulic Engineering, Aalto University School of Electrical Engineering
Contributors: Veronese, A., Racca, M., Pieters, R., Kyrki, V.
Number of pages: 11
Publication date: 30 Oct 2017
Peer-reviewed: Yes

Publication information

Journal: Frontiers in Robotics and AI
Article number: 53
ISSN (Print): 2296-9144
Ratings: 
  • Scopus rating (2017): SNIP 1.448
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Inkjet printed metallic micropillars for bare die flip-chip bonding

Inkjet printed metal micropillars have been developed to help meet the demands for novel and highly adaptable microelectronics fabrication processes. The digitally printed silver pillar arrays in this study have been utilized in place of wafer-level solder bump processes or chip-level wire-bonded stud bumps. These three-dimensional silver pillars were printed with a drop-on-demand piezoelectric inkjet printer utilizing silver nanoparticle ink. The inkjet printed micropillars were found to have 22 μ m diameters and a height equivalent to approximately 3 μ m per droplet. In our study, we chose pillars for further use as stud bumps with 8, 10, 12 and 14 droplets, with heights of approximately 20.9 μ m, 25.9 μ m, 33.3 μ m and 35.9 μ m respectively. After printing on the bare dies the bumps were subsequently used to increase the contact reliability of flip-chip bonded samples. It was found that the bumped chips dramatically improved the reliability of the I/O connection as compared to unbumped samples. In fact nearly 88% of the bumped pads had a resistance less than 2.5 Ω/bump (no noticeable variation between bump heights) as compared to 17% for the unbumped bare dies. This study clearly demonstrates the fabrication of inkjet printed silver micropillars for use in uniform stud bump arrays. Furthermore, the feasibility of incorporating inkjet printed silver stud bumps for use in flip-chip fabrication methods was demonstrated.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Electronics and Communications Engineering, Research group: Laboratory for Future Electronics
Contributors: Khorramdel, B., Kraft, T. M., Mäntysalo, M.
Pages: 045005
Publication date: 26 Oct 2017
Peer-reviewed: Yes

Publication information

Journal: Flexible and Printed Electronics
Volume: 2
Issue number: 4
ISSN (Print): 2058-8585
Ratings: 
  • Scopus rating (2017): CiteScore 2.68 SJR 0.779 SNIP 1.163
Original language: English
Source: Bibtex
Source ID: urn:8f4049c2ab7f16fafb13e340ca8b6ef9

Research output: Contribution to journalArticleScientificpeer-review

The effect of tungsten carbide particles content in a weld deposit on its abrasion resistance

This paper describes the study of a weld deposit which contains tungsten carbide particles. For testing the process of gas metal arc welding in a protective atmosphere of a mixed gas with two types of cored wires were used. The selected cored electrode of a "F-Durit G" type already contains the tungsten carbide particles. The second used option was a cored electrode of a "Megafil A 864M" type with an increased boron content. For the second variant tungsten carbide particles with a 1-2 mm size were added to the weld pool, and a composite material layer was thus created. For the mentioned test two different levels of welding parameters were selected and the final weld deposit properties, particularly their abrasion resistance, were examined.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Materials Science, VSB-Technical University Ostrava, Czech Republic, University of Osijek
Contributors: Hlavatý, I., Kozák, J., Krejci, L., Samardzic, I., Tuominen, J.
Number of pages: 5
Pages: 1345-1349
Publication date: Oct 2017
Peer-reviewed: Yes

Publication information

Journal: Technical Gazette - Technicki vjesnik
Volume: 24
Issue number: 5
ISSN (Print): 1848-6339
Original language: English
Keywords: Hardfacing, Metal matrix composite, Gas metal arc welding, Abrasive wear
Electronic versions: 

Research output: Contribution to journalArticleScientificpeer-review

Comparative investigation of remote tracking devices for aging care

Tracking devices help the elderly patients to remain safe, secure and traceable in case of getting lost or in an emergency. This research work was conducted to evaluate the appropriateness of few commercially available tracking devices for aging people, by identifying their usefulness, efficiency, limitations and further improvements. Research involved two steps; literature review about two existing tracking devices simply termed device A and device B, followed by a performance and comparative analysis of the aforementioned devices by applying basic statistics on the results obtained from a questionnaire survey. Devices were used by two groups of people: aging (>70 year old) and middle-aged patients (less than 70 years old) who reported their satisfaction levels about the said devices on a scale of one to five. These devices were found helpful in reducing the dependency of the elderly on others and raised their privacy values. However, these were not recommended for severe memory loss or later stage of critical staged dementia patients because learning and memorizing the process of handling these devices can be difficult for them. Overall, the performance of device B outplayed device A while comparing all considered device parameters. The calling feature of device B appeared to be an appealing characteristic with mean satisfaction levels of 4.9 textpm 0.32 and 4.7 textpm 0.48 as reported by the middle-aged and aging groups, respectively. These devices will be helpful in decreasing unnecessary rush at health care centers or lost person reporting in police. In upcoming years, these devices can be developed to remotely monitor the movement of the patient.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Faculty of Biomedical Sciences and Engineering
Contributors: Munir, M. W., Shahid, N., Omair, S. M., Munir, G., Ul Haque, M. Z.
Number of pages: 6
Pages: 261-266
Publication date: 1 Sep 2017
Peer-reviewed: Yes

Publication information

Journal: INTERNATIONAL JOURNAL OF INFORMATION TECHNOLOGY
Volume: 9
Issue number: 3
ISSN (Print): 2511-2112
Original language: English
Source: Bibtex
Source ID: urn:3fb5001f93a07dc83f4e1bd74b4d0420

Research output: Contribution to journalArticleScientificpeer-review

NB-IoT for D2D-enhanced content uploading with social trustworthiness in 5G systems

Future fifth-generation (5G) cellular systems are set to give a strong boost to the large-scale deployment of Internet of things (IoT). In the view of a future converged 5G-IoT infrastructure, cellular IoT solutions such as narrowband IoT (NB-IoT) and device-to-device (D2D) communications are key technologies for supporting IoT scenarios and applications. However, some open issues still need careful investigation. An example is the risk of threats to privacy and security when IoT mobile services rely on D2D communications. To guarantee efficient and secure connections to IoT services involving exchange of sensitive data, reputation-based mechanisms to identify and avoid malicious devices are fast gaining ground. In order to tackle the presence of malicious nodes in the network, this paper introduces reliability and reputation notions to model the level of trust among devices engaged in an opportunistic hop-by-hop D2D-based content uploading scheme. To this end, social awareness of devices is considered as a means to enhance the identification of trustworthy nodes. A performance evaluation study shows that the negative effects due to malicious nodes can be drastically reduced by adopting the proposed solution. The performance metrics that proved to benefit from the proposed solution are data loss, energy consumption, and content uploading time.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Electronics and Communications Engineering, Universita degli Studi di Reggio Calabria, Peoples’ Friendship University of Russia
Contributors: Militano, L., Orsino, A., Araniti, G., Iera, A.
Publication date: 8 Jul 2017
Peer-reviewed: Yes

Publication information

Journal: Future Internet
Volume: 9
Issue number: 3
Article number: 31
ISSN (Print): 1999-5903
Ratings: 
  • Scopus rating (2017): CiteScore 1.25 SJR 0.219 SNIP 0.906
Original language: English
ASJC Scopus subject areas: Computer Networks and Communications
Keywords: 5G systems, D2D communications, Internet of things, NB-IoT, Trustworthiness

Bibliographical note

INT=elt,"Orsino, Antonino"

Source: Scopus
Source ID: 85022204929

Research output: Contribution to journalArticleScientificpeer-review

Natural Gas Engine Emission Reduction by Catalysts

In order to meet stringent emission limits, after-treatment systems are increasingly utilized in natural gas engine applications. In this work, two catalyst systems were studied in order to clarify how the catalysts affect, e.g. hydrocarbons, NOx and particles present in natural gas engine exhaust. A passenger car engine modified to run with natural gas was used in a research facility with possibilities to modify the exhaust gas properties. High NOx reductions were observed when using selective catalytic reduction, although a clear decrease in the NOx reduction was recorded at higher temperatures. The relatively fresh methane oxidation catalyst was found to reach reductions greater than 50% when the exhaust temperature and the catalyst size were sufficient. Both the studied catalyst systems were found to have a significant effect on particulate emissions. The observed particle mass reduction was found to be due to a decrease in the amount of organics passing over the catalyst. However, especially at high exhaust temperatures, high nanoparticle concentrations were observed downstream of the catalysts together with higher sulphate concentrations in particles. This study contributes to understanding emissions from future natural gas engine applications with catalysts in use.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Research area: Aerosol Physics, Finnish Meteorological Institute, Helsinki, VTT Technical Research Centre of Finland, Atmospheric Composition Research, Finnish Meteorological Institute, Dinex Ecocat Oy, Dinex Ecocat Oy, Catalyst Res
Contributors: Lehtoranta, K., Murtonen, T., Vesala, H., Koponen, P., Alanen, J., Simonen, P., Rönkkö, T., Timonen, H., Saarikoski, S., Maunula, T., Kallinen, K., Korhonen, S.
Number of pages: 10
Pages: 142-152
Publication date: Jun 2017
Peer-reviewed: Yes
Early online date: 23 Dec 2016

Publication information

Journal: Emission Control Science and Technology
Volume: 3
Issue number: 2
ISSN (Print): 2199-3629
Ratings: 
  • Scopus rating (2017): CiteScore 1.98 SJR 0.731 SNIP 1.435
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Influence of the rotor eccentricity on the torque of a cage induction machine

The non-uniform air gap in an electrical machine caused by rotor eccentricity creates an asymmetrical flux-density distribution in the air gap. This can affect the nominal torque produced by the machine. Eccentricity also produces forces that act on the rotor which may also have an effect on the torque. Thus, it is important to know how the torque of the machine behaves. In this paper, the torque of a cage induction machine is studied when the machine has dynamic eccentricity. The study is performed using the finite element method and a magnetic vector potential formulation. The torque is calculated by the method of energy balance. The harmonic components of the torque are also analyzed. The results show that the machine under eccentricity does not exhibit the same torque as a normal healthy machine. The harmonic components around the first principal slot harmonic is most affected.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Electrical Energy Engineering, Research group: Electromechanics, Research area: Power engineering, Aalto University
Contributors: Silwal, B., Rasilo, P., Belahcen, A., Arkkio, A.
Pages: 383-396
Publication date: Jun 2017
Peer-reviewed: Yes

Publication information

Journal: Archives of Electrical Engineering
Volume: 66
Issue number: 2
ISSN (Print): 2300-2506
Ratings: 
  • Scopus rating (2017): CiteScore 0.86 SJR 0.233 SNIP 0.65
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Kactus2: A graphical EDA tool built on the IP-XACT standard

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Pervasive Computing, Research area: Computer engineering, Research area: Computer engineering
Contributors: Virtanen, J., Kamppi, A., Pekkarinen, E., Määttä, J., Järvinen, J., Matilainen, L. J., Teuho, M., Hämäläinen, T.
Number of pages: 1
Pages: 1
Publication date: 2 May 2017
Peer-reviewed: Yes

Publication information

Journal: The Journal of Open Source Software
Volume: 2
Issue number: 13
ISSN (Print): 2475-9066
Original language: English
Keywords: IP-XACT, EDA, reuse, mpsoc, design, system-on-chip, Hardware
Electronic versions: 

Bibliographical note

INT=tie,"Järvinen, Juho"

Research output: Contribution to journalArticleScientificpeer-review

Editorial: Information to support decision-making

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering
Contributors: Juuti, P. S.
Pages: 5-6
Publication date: May 2017
Peer-reviewed: Yes

Publication information

Journal: Ympäristöhistoria: Finnish Journal of Environmental History
Volume: 2017
Issue number: 1
ISSN (Print): 1799-6953
Original language: English

Research output: Contribution to journalEditorialScientificpeer-review

Alkyl thiophene vinylene electropolymerization in C8mimPF6, potential use in solar cells

We report the electrosynthesis of a novel semiconductor polymer based on alkyl vinylthiophene derivative in the presence of an ionic liquid (IL). The polymerization was performed under galvanostatic conditions and the polymer was studied as potential donor component of a multilayer heterojunction organic solar cell (OSC). The monomer used was (E)-1,2-di-(3-octyl-2-thienyl) vinylene (OTV) and the IL used for the electropolymerization was 1-octyl-3-methylimidazole hexafluorophosphate C8mimPF6. Optical properties, stability and morphology of the polymer were analyzed using FT-IR, UV-vis, Raman and XPS spectroscopy. Voltammetry analysis and scanning electron microscopy (SEM-EDX) were also performed on the polymer. The OSC assembled with the polymer of OTV was used as electro donor and C60 as acceptor. Molybdenum trioxide (MoO3) and bathocuproine (BCP) were used as buffer layer between anode and cathode respectively. I-V curves, in the dark and under AM 1.5 solar simulator were performed to measure its efficiency.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Chemistry and Bioengineering, Research group: Supramolecular photochemistry, Research group: Chemistry & Advanced Materials
Contributors: Rojas, V., Martinez, F., Bernede, J. C., Guenadez, L. C., Efimov, A., Lemmetyinen, H.
Number of pages: 13
Pages: 405-417
Publication date: May 2017
Peer-reviewed: Yes

Publication information

Journal: Materials Sciences and Applications
Volume: 8
Issue number: 5
ISSN (Print): 2153-117X
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Collagen-immobilized polyimide membranes for retinal pigment epithelial cell adherence and proliferation

Degenerative retinal diseases are a leading cause of visual loss and irreversible blindness, particularly in the developed world. Retinal pigment cell (RPE) transplantation is nowadays considered the most promising therapeutic approach for certain retinal diseases, and the presence of a supportive scaffold has been considered essential to ensure the success of the implant. In this work, collagen IV was covalently immobilized to the surface of polyimide membranes, with the purpose of developing scaffold materials for RPE cell culture. The covalent modification method involved four steps: argon-plasma treatment, acrylic acid graft polymerization, surface activation, and finally immobilization of collagen type IV. Collagen-modified membranes did not become more rough but became significantly more hydrophilic than the unmodified and dip-coated controls. ARPE-19 cell morphology and attachment were studied by immunofluorescence staining and confocal microscopy. Covalently modified surfaces showed cell attachment and cell properties comparable to the uncoated and dip-coated controls. This work demonstrated the potential of collagen IV-immobilized polyimide membranes as substrates for the growth of ARPE-19 cells.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Biomaterials and Tissue Engineering Group, BioMediTech, University of Tampere, BioMediTech
Contributors: Teymouri, S., Calejo, M. T., Hiltunen, M., Sorkio, A. E., Juuti-Uusitalo, K., Skottman, H., Kellomäki, M.
Publication date: 6 Mar 2017
Peer-reviewed: Yes

Publication information

Journal: Cogent Chemistry
Volume: 3
Issue number: 1
ISSN (Print): 2331-2009
Original language: English
Keywords: Polyimide, Retinal pigment epithelial cell, SURFACE MODIFICATION, tissue engineering

Research output: Contribution to journalArticleScientificpeer-review

Reaction heat utilization in aluminosilicate-based ceramics synthesis and sintering

Self-propagating high-temperature synthesis (SHS) is a widely known and extensively studied highly exothermicreaction- utilizing technique for making certain advanced composites and intermetallic compounds. However, only few studies have been published about the SHS of pure aluminosilicate ceramics. In the current work, possibilities for aluminosilicate ceramic synthesis and sintering requiring less energy based on the utilization of SHS in air was studied. Kaolinite powder and exothermically reactive metallic aluminium powder were used as raw materials. Thermodynamic calculations for the possible reactions and reaction paths were performed to show the theoretical possibilities for SHS utilization. The chemical reactions, thermal expansion behaviour and formed phase- and microstructures after SHS were compared to the conventional reaction sintering of mullite. Results conclude that highly exothermic reactions above 900 °C relating mainly to aluminium oxidation can ignite the SHS reaction in air atmosphere. After initialization, the reaction proceeded in a self-sustaining manner through entire test pieces, resulting in the formation of an Al2O3 - Si phase structure. Thermodynamic calculations showed the total energy balance for mullite formation from aluminium and kaolinite mixtures as highly exothermic in nature only if sufficient oxygen is available to complete the reactions. However, future research is needed to fully utilize SHS in aluminosilicate ceramics processing.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Materials Science, Research group: Ceramic materials, VTT Technical Research Centre of Finland
Contributors: Karhu, M., Lagerbom, J., Kivikytö-Reponen, P., Ismailov, A., Levänen, E.
Number of pages: 12
Pages: 101-112
Publication date: 1 Mar 2017
Peer-reviewed: Yes

Publication information

Journal: Journal of Ceramic Science and Technology
Volume: 8
Issue number: 1
ISSN (Print): 2190-9385
Ratings: 
  • Scopus rating (2017): CiteScore 1.4 SJR 0.374 SNIP 0.801
Original language: English
ASJC Scopus subject areas: Ceramics and Composites
Keywords: Aluminosilicate ceramics, Exothermic reactions, Self-propagating high-temperature synthesis, SHS, Sintering, Synthesis

Bibliographical note

EXT="Lagerbom, J."

Source: Scopus
Source ID: 85017026033

Research output: Contribution to journalArticleScientificpeer-review

Effect of Laser Power on Yield of TiO2 Nanoparticles Synthesized by Pulsed Laser Ablation in Water

In this study, the pulsed laser ablation in liquids (PLAL) technique was used on titanium in deionized water at different laser powers to understand its effect on the synthesis yield of nanoparticles. A 500-ns 1062-nm fiber laser at 25 kHz was used to effect PLAL of titanium to produce nanoparticles. TEM images of the synthesized nanoparticles showed spherical particles ranging from 3 32 nm in diameter. The electron diffraction pattern and high peaks in the wide-angle x-ray scattering (WAXS) pattern indicated high crystallinity of nanoparticles. WAXS results showed nanoparticles were allotropes of titania: rutile and anatase. Synthesis yield measurements indicated an increase in yield with the increase in laser power as long as the increase in laser fluence remains proportional to the increase in laser power. However, the yield increased proportionally with the increase in laser fluence. The analysis of the chosen laser pulse duration and repetition rate showed an increase in the yield with longer pulse duration and higher repetition rate.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Materials Science, Research group: Ceramic materials, Mechanical Engineering and Industrial Systems, Research area: Manufacturing and Automation, Research group: Surface Engineering, Research group: Materials Characterization, Research group: Ceramic materials
Contributors: Singh, A., Vihinen, J., Frankberg, E., Hyvärinen, L., Honkanen, M., Levänen, E.
Number of pages: 5
Pages: 39-43
Publication date: Mar 2017
Peer-reviewed: Yes

Publication information

Journal: Journal of Ceramic Science and Technology
Volume: 8
Issue number: 1
ISSN (Print): 2190-9385
Ratings: 
  • Scopus rating (2017): CiteScore 1.4 SJR 0.374 SNIP 0.801
Original language: English
Keywords: Nanoparticles, synthesis yield, pulsed laser ablation in liquids, WAXS, laser fluence, WAVELENGTH, GOLD
Electronic versions: 
Source: WOS
Source ID: 000397702900008

Research output: Contribution to journalArticleScientificpeer-review

Evolutionary multiobjective optimization for adaptive dataflow-based digital predistortion architectures

In wireless communication systems, high-power transmitters suffer from nonlinearities due to power amplifier (PA) characteristics, I/Q imbalance, and local oscillator (LO) leakage. Digital Predistortion (DPD) is an effective technique to counteract these impairments. To help maximize agility in cognitive radio systems, it is important to investigate dynamically reconfigurable DPD systems that are adaptive to changes in the employed modulation schemes and operational constraints. To help maximize effectiveness, such reconfiguration should be performed based on multidimensional operational criteria. With this motivation, we develop in this paper a novel evolutionary algorithm framework for multiobjective optimization of DPD systems. We demonstrate our framework by applying it to develop an adaptive DPD architecture, called the adaptive, dataflow-based DPD architecture (ADDA), where Pareto-optimized DPD parameters are derived subject to multidimensional constraints to support efficient predistortion across time-varying operational requirements and modulation schemes. Through extensive simulation results, we demonstrate the effectiveness of our proposed multiobjective optimization framework in deriving efficient DPD configurations for run-time adaptation.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Pervasive Computing, Electronics and Communications Engineering, Research group: Wireless Communications and Positioning, Research area: Computer engineering, University of Oulu
Contributors: Li, L., Ghazi, A., Boutellier, J., Anttila, L., Valkama, M., Bhattacharyya, S. S.
Publication date: 23 Feb 2017
Peer-reviewed: Yes

Publication information

Journal: EAI Endorsed Transactions on Cognitive Communications
Volume: 17
Issue number: 10
Article number: e3
ISSN (Print): 2313-4534
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Suomen vesihuollon kehitys ja opit kansainvälisessä kontekstissa

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering
Contributors: Katko, T. S.
Number of pages: 4
Pages: 8-11
Publication date: 2017
Peer-reviewed: Yes

Publication information

Journal: Vesitalous
Volume: 58
Issue number: 1
ISSN (Print): 0505-3838
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Three-color vector nematicon

Light localization via reorientation in nematic liquid crystals supports multi-component optical spatial solitons, i.e., vector nematicons. By launching three optical beams of different wavelengths and the same input polarization in a bias-free planar cell, we demonstrate a three-color vector nematicon which is self-trapped thanks to its incoherent nature.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Photonics, Politechnika Warszawska, Univ Roma Tre, Roma Tre University, Dept Elect Engn, NooEL, University “Roma Tre”, Aerosol Physics Laboratory
Contributors: Laudyn, U. A., Kwaśny, M., Karpierz, M. A., Assanto, G.
Number of pages: 3
Pages: 36-38
Publication date: 2017
Peer-reviewed: Yes

Publication information

Journal: Photonics Letters of Poland
Volume: 9
Issue number: 2
ISSN (Print): 2080-2242
Ratings: 
  • Scopus rating (2017): CiteScore 0.48 SJR 0.25 SNIP 0.36
Original language: English
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials
Electronic versions: 
Source: Scopus
Source ID: 85021814168

Research output: Contribution to journalArticleScientificpeer-review

Manipulating Superparamagnetic Microparticles with an Electromagnetic Needle

Selective, precise, and high-throughput manipulation of individual superparamagnetic microparticles has profound applications in performing location-tailored in vitro biomedical studies. The current techniques for manipulation of microparticles allow only a single particle in the manipulation workspace, or simultaneous transportation of multiple microparticles in batches. In this work, a method based on a robotized electromagnetic needle for manipulation of individual superparamagnetic microparticles within a microparticle population is introduced. By automatically controlling the highly localized magnetic field of the needle, a single microparticle is selectively picked when its neighboring particle is few micrometers away. Supported by the nanometer resolution of the robotic positioner, particles are placed at sub-micrometer precision. This manipulation technique allows the creating of arbitrary patterns, sorting of microparticles based on size and morphology, and transporting of individual microparticles in 3D space. Therefore, this approach has the potential to enable more deterministic and quantitative microanalysis and microsynthesis using superparamagnetic microparticles.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Micro and Nanosystems Research Group, Research group: Bioinspired Materials and Robotics (BMR)
Contributors: Cenev, Z., Zhang, H., Sariola, V., Rahikkala, A., Liu, D., Santos, H. A., Zhou, Q.
Publication date: 2017
Peer-reviewed: Yes

Publication information

Journal: Advanced Materials Technologies
Volume: 3
Issue number: 1
Article number: 1700177
ISSN (Print): 2365-709X
Ratings: 
  • Scopus rating (2017): CiteScore 3.85 SJR 1.241 SNIP 0.99
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Securing the flow of information in renovation projects: Sustainable synergies from buildings to the urban scale

Continuous flow of information is a paramount importance for the success of a renovation project. This has been a clear statement in several researches, clearances, publications and press releases in Finland. Tampere University of Technology (TUT) studied Finnish state supported mold renovations in three independent researches between 2010 and 2016. First one brought out that the observations made in the condition investigation weren’t always taken into account in the implementation of the renovation. Next two researches focused to study the additional state grant processes, where the external review procedures were helping the flow of information. However, the processes still had some shortcomings and therefore the research team developed a form based method that property owners and builders can utilize for a successful removal of the indoor air problems. This paper describes the outlines of the form as well as the principles and methods for securing the flow of information from condition investigations to the renovation design and quality assurance of the building project. Project planning and monitoring measurements are also taken into account in the method.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Civil Engineering, Research area: Structural Engineering
Contributors: Marttila, T., Annila, P., Suonketo, J., Kero, P., Pentti, M.
Number of pages: 6
Pages: 228-233
Publication date: 2017
Peer-reviewed: Yes

Publication information

Journal: PROCEDIA ENVIRONMENTAL SCIENCES
Volume: 38
ISSN (Print): 1878-0296
Original language: English
Keywords: Moisture damage, Indoor air quality (IAQ), Condition investigation, Renovation design
Source: RIS
Source ID: urn:1E04A8F47620BCE57737681F0930D8DB

Research output: Contribution to journalArticleScientificpeer-review

Teoriaa ja kokemuksia arvioinnista MOOCien aikakaudella

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Information Management and Logistics, Research group: Novi, Tampere University of Applied Sciences
Contributors: Helander, N., Myllylä, M.
Number of pages: 7
Pages: 70-77
Publication date: 11 Jul 2016
Peer-reviewed: Yes

Publication information

Journal: TAMPEREEN AMMATTIKORKEAKOULUN JULKAISUJA. SARJA B, RAPORTTEJA
ISSN (Print): 1456-002X
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Image-based characterization of the pulp flows

Material flow characterization is important in the process industries and its further automation. In this study, close-to-laminar pulp suspension flows are analyzed based on double-exposure images captured in laboratory conditions. The correlation-based methods including autocorrelation and the particle image pattern technique were studied. During the experiments, synthetic and real test data with manual ground truth were used. The particle image pattern matching method showed better performance achieving the accuracy of 90.0% for the real data set with linear motion of the suspension and 79.2% for the data set with flow distortions.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Lappeenranta University of Technology, Machine Vision and Pattern Recognition Laboratory, Laboratory of Biosystem Dynamics, Univ of Oulu, Monash University Malaysia
Contributors: Sorokin, M., Strokina, N., Eerola, T., Lensu, L., Karttunen, K., Kalviainen, H.
Number of pages: 8
Pages: 630-637
Publication date: 1 Jul 2016
Peer-reviewed: Yes

Publication information

Journal: Pattern Recognition and Image Analysis
Volume: 26
Issue number: 3
ISSN (Print): 1054-6618
Ratings: 
  • Scopus rating (2016): CiteScore 0.55 SJR 0.255 SNIP 0.872
Original language: English
ASJC Scopus subject areas: Computer Graphics and Computer-Aided Design, Computer Vision and Pattern Recognition
Keywords: double-exposure, particle image velocimetry, pulp flow estimation
Source: Scopus
Source ID: 84984924424

Research output: Contribution to journalArticleScientificpeer-review

Data including GROMACS input files for atomistic molecular dynamics simulations of mixed, asymmetric bilayers including molecular topologies, equilibrated structures, and force field for lipids compatible with OPLS-AA parameters

In this Data in Brief article we provide a data package of GROMACS input files for atomistic molecular dynamics simulations of multicomponent, asymmetric lipid bilayers using the OPLS-AA force field. These data include 14 model bilayers composed of 8 different lipid molecules. The lipids present in these models are: cholesterol (CHOL), 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylcholine (POPC), 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylethanolamine (POPE), 1-stearoyl-2-oleoyl-sn-glycero-3-phosphatidyl-ethanolamine (SOPE), 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylserine (POPS), 1-stearoyl-2-oleoyl-sn-glycero-3-phosphatidylserine (SOPS), N-palmitoyl-. D-erythro-sphingosyl-phosphatidylcholine (SM16), and N-lignoceroyl-. D-erythro-sphingosyl-phosphatidylcholine (SM24). The bilayers[U+05F3] compositions are based on lipidomic studies of PC-3 prostate cancer cells and exosomes discussed in Llorente et al. (2013) [1], showing an increase in the section of long-tail lipid species (SOPS, SOPE, and SM24) in the exosomes. Former knowledge about lipid asymmetry in cell membranes was accounted for in the models, meaning that the model of the inner leaflet is composed of a mixture of PC, PS, PE, and cholesterol, while the extracellular leaflet is composed of SM, PC and cholesterol discussed in Van Meer et al. (2008) [2]. The provided data include lipids' topologies, equilibrated structures of asymmetric bilayers, all force field parameters, and input files with parameters describing simulation conditions (md.mdp). The data is associated with the research article "Interdigitation of Long-Chain Sphingomyelin Induces Coupling of Membrane Leaflets in a Cholesterol Dependent Manner" (Róg et al., 2016) [3].

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Research area: Computational Physics, Research group: Biological Physics and Soft Matter, University of Helsinki, University of Limerick, University of Oslo, Zora Biosciences Oy, MEMPHYS - Centre for Biomembrane Physics, University of Southern Denmark
Contributors: Róg, T., Orłowski, A., Llorente, A., Skotland, T., Sylvänne, T., Kauhanen, D., Ekroos, K., Sandvig, K., Vattulainen, I.
Number of pages: 4
Pages: 1171-1174
Publication date: 1 Jun 2016
Peer-reviewed: Yes

Publication information

Journal: Data in Brief
Volume: 7
ISSN (Print): 2352-3409
Ratings: 
  • Scopus rating (2016): CiteScore 0.5 SJR 0.226 SNIP 0.213
Original language: English
Keywords: Force field, GROMACS, Lipid, Lipidomics, Molecular dynamics simulations, Topology
Source: Scopus
Source ID: 84962909567

Research output: Contribution to journalArticleScientificpeer-review

Parameters Affecting the Upcycling of Waste Cotton and PES/CO Textiles

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Materials Science, Research group: Fibre Materials
Contributors: Vats, S., Rissanen, M.
Number of pages: 12
Pages: 166-177
Publication date: 30 May 2016
Peer-reviewed: Yes

Publication information

Journal: Recycling
Volume: 1
Issue number: 1
ISSN (Print): 2313-4321
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Architecture beyond signs and symbols : Zumthor's response to the problems of aesthetics

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: School of Architecture, Research group: History of Architecture
Contributors: Passinmäki, P.
Number of pages: 4
Pages: 325-328
Publication date: 12 May 2016
Peer-reviewed: Yes

Publication information

Journal: ARQ-Architectural Research Quarterly
Volume: 19
Issue number: 4
ISSN (Print): 1359-1355
Ratings: 
  • Scopus rating (2016): CiteScore 0.06 SJR 0.127 SNIP 0.244
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Adaptive fuzzy inference system based directional median filter for impulse noise removal

Noise filtering in presence of important image detail information is considered as challenging task in imaging applications. Use of fuzzy logic based techniques is capturing more focus since last decade to deal with these challenges. In order to tackle conflicting issues of noise smoothing and detail preservation, this paper presents a novel approach using adaptive fuzzy inference system for random valued impulse noise detection and removal. The proposed filter uses the intensity based directional statistics to construct adaptive fuzzy membership functions which plays an important role in fuzzy inference system. Fuzzy inference system constructed in this way is used by the noise detector for accurate classification of noisy and noise-free pixels by differentiating them from edges and detailed information present in an image. After classification of pixels, noise adaptive filtering is performed based on median and directional median filter using the information provided by the noise detector. Simulation results based on well known quantitative measure i.e., peak-signal-to-noise ratio (PSNR) show the effectiveness of proposed filter.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, International Islamic University Islamabad
Contributors: Habib, M., Hussain, A., Rasheed, S., Ali, M.
Number of pages: 9
Pages: 689-697
Publication date: 1 May 2016
Peer-reviewed: Yes

Publication information

Journal: AEU International Journal of Electronics and Communication
Volume: 70
Issue number: 5
ISSN (Print): 1434-8411
Ratings: 
  • Scopus rating (2016): CiteScore 1.49 SJR 0.32 SNIP 0.964
Original language: English
ASJC Scopus subject areas: Electrical and Electronic Engineering
Keywords: Adaptive threshold, Fuzzy inference system, Noise detection, Noise removal, Random-valued impulse noise

Bibliographical note

INT=elt,"Ali, Mubashir"

Source: Scopus
Source ID: 84959549053

Research output: Contribution to journalArticleScientificpeer-review

Fully printed memristors for a self-sustainable recorder of mechanical energy

Memristors have attracted significant interest in recent years because of their role as a missing electronic component and unique functionality that has not previously existed. Since the first discoveries of the existence of memristive materials, various different fabrication processes for memristors have been presented. Here, a simple additive fabrication process is demonstrated where memristors were deposited on a polymer substrate by conventional inkjet printing. The memristor structure was printed on a 125 μ m thick polyethylene terephthalate (PET) substrate by sandwiching a thin layer of TiO x between two silver nanoparticle ink electrodes. Current–voltage ( IV ) characterization measurements were performed and they showed clear memristive behavior when voltage pulse amplitude varied between −1.5 V and 1.5 V. The corresponding resistance change is approximately between 150 Ω and 75 kΩ. In order to demonstrate the switching scheme in practical application, printed memristors and a printed voltage doubler were connected with a piezoelectric element. The element was subjected to impact-type excitation thus producing an electric charge that was able to switch the memristor between high and low resistive states. These results pave the way for an exploitation of cost-efficient, self-sufficient, all-printable memory elements for wide utilization in future electronics applications.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Department of Automation Science and Engineering, Research area: Microsystems, Research area: Measurement Technology and Process Control
Contributors: Vilmi, P., Nelo, M., Voutilainen, J., Palosaari, J., Pörhönen, J., Tuukkanen, S., Jantunen, H., Juuti, J., Fabritius, T.
Number of pages: 8
Publication date: 19 Apr 2016
Peer-reviewed: Yes

Publication information

Journal: Flexible and Printed Electronics
Volume: 1
Issue number: 2
Article number: 025002
ISSN (Print): 2058-8585
Original language: English
Source: Bibtex
Source ID: urn:93364f0c9fc6d11e220f8d004617b3a2

Research output: Contribution to journalArticleScientificpeer-review

Quenching nematicon fluctuations via photo-stabilization

Light localization into optical spatial solitons can be achieved by launching optical beams in nonlocal nonlinear nematic liquid crystals. Such solitons often undergo undesired fluctuations of their trajectories. We demonstrate that partial polymerization in monoacrylate-doped nematic liquid crystals is effective in quenching such fluctuations in transverse space.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Research area: Optics, Research group: Nonlinear Optics, Department of Chemistry and Bioengineering, Research group: Supramolecular photochemistry
Contributors: Karimi, N., Alberucci, A., Virkki, M., Priimägi, A., Kauranen, M., Assanto, G.
Number of pages: 3
Pages: 2-4
Publication date: 31 Mar 2016
Peer-reviewed: Yes

Publication information

Journal: Photonics Letters of Poland
Volume: 8
Issue number: 1
ISSN (Print): 2080-2242
Ratings: 
  • Scopus rating (2016): CiteScore 0.37 SJR 0.197 SNIP 0.272
Original language: English

Research output: Contribution to journalLetterScientificpeer-review

First-principles data set of 45,892 isolated and cation-coordinated conformers of 20 proteinogenic amino acids

We present a structural data set of the 20 proteinogenic amino acids and their amino-methylated and acetylated (capped) dipeptides. Different protonation states of the backbone (uncharged and zwitterionic) were considered for the amino acids as well as varied side chain protonation states. Furthermore, we studied amino acids and dipeptides in complex with divalent cations (Ca2+, Ba2+, Sr2+, Cd2+, Pb2+, and Hg2+). The database covers the conformational hierarchies of 280 systems in a wide relative energy range of up to 4 eV (390 kJ/mol), summing up to a total of 45,892 stationary points on the respective potential-energy surfaces. All systems were calculated on equal first-principles footing, applying density-functional theory in the generalized gradient approximation corrected for long-range van der Waals interactions. We show good agreement to available experimental data for gas-phase ion affinities. Our curated data can be utilized, for example, for a wide comparison across chemical space of the building blocks of life, for the parametrization of protein force fields, and for the calculation of reference spectra for biophysical applications.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Fritz Haber Institute of the Max Planck Society, COMP Centre of Excellence, Department of Applied Physics, Aalto University, Aalto University, Duke University
Contributors: Ropo, M., Schneider, M., Baldauf, C., Blum, V.
Publication date: 16 Feb 2016
Peer-reviewed: Yes

Publication information

Journal: Scientific Data
Volume: 3
Article number: 160009
ISSN (Print): 2052-4463
Ratings: 
  • Scopus rating (2016): CiteScore 4.8 SJR 3.261 SNIP 2.124
Original language: English
ASJC Scopus subject areas: Education, Library and Information Sciences, Computer Science Applications, Information Systems, Statistics, Probability and Uncertainty, Statistics and Probability
Source: Scopus
Source ID: 84961184519

Research output: Contribution to journalArticleScientificpeer-review

Linear and nonlinear light beam propagation in chiral nematic liquid crystal waveguides

We employ a thick layer of chiral nematic liquid crystals to demonstrate the evolution of a one-dimensional (1D) higher-order guided mode into a beam self-confined in both transverse dimensions at various wavelengths. We also report the experimental observation of higher-order modes guided by soliton-induced waveguides in chiral nematic liquid crystals.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Politechnika Warszawska, University of Warsaw, Aerosol Physics Laboratory, Nonlinear Optics and OptoElectronics Lab, University “Roma Tre”
Contributors: Laudyn, U. A., Kwaśny, M., Jung, P. S., Trippenbach, M., Assanto, G., Karpierz, M. A.
Number of pages: 3
Pages: 11-13
Publication date: 2016
Peer-reviewed: Yes

Publication information

Journal: Photonics Letters of Poland
Volume: 8
Issue number: 1
ISSN (Print): 2080-2242
Ratings: 
  • Scopus rating (2016): CiteScore 0.37 SJR 0.197 SNIP 0.272
Original language: English
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials
Source: Scopus
Source ID: 84962158419

Research output: Contribution to journalArticleScientificpeer-review

Influence of environmental conditions on EMF levels in a span of overhead transmission lines

The paper is devoted to the investigation of electromagnetic field distribution in the vicinity of overhead transmission lines under different environmental conditions, taking into account the wire sag curve in a span. A wire state equation is utilized, which allows one to calculate stresses in the wire and sags based on the known stresses and temperatures in the initial state. The results of the electric and magnetic field distribution on sample 330 kV and 110 kV transmission lines are presented. We show that the highest electromagnetic field levels are associated with the most severe environmental conditions, resulting in the highest sag.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Environmental Health, LLC Soyuzenergoproekt
Contributors: Okun, O., Kravchenko, Y., Korpinen, L.
Number of pages: 9
Pages: 163-171
Publication date: 2016
Peer-reviewed: Yes

Publication information

Journal: Progress in Electromagnetics Research C
Volume: 63
ISSN (Print): 1937-8718
Ratings: 
  • Scopus rating (2016): CiteScore 0.83 SJR 0.221 SNIP 0.597
Original language: English
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials
Source: Scopus
Source ID: 84971219955

Research output: Contribution to journalArticleScientificpeer-review

High efficiency dilute nitride solar cells: Simulations meet experiments

Parameter extraction procedure and simulation of dilute nitride solar cells are reported. Using PC1D simulation and fitting to experimental current-voltage and external quantum efficiency data, we retrieve the phenomenological material parameters for GaInNAs solar cells. Based on these, we have constructed a model that can explain the changes in short circuit current and open circuit voltage of n-i-p solar cells subjected to rapid thermal annealing. The model reveals that non-annealed MBE-grown GaInNAs material has an n-type doping that evolves to p-type upon rapid thermal annealing. The change of doping type and the shift of the physical location of the pn-junction were confirmed by Kelvin-probe force microscopy. The PC1D modelling was found to work well also for GaInNAs p-i-n solar cells with opposite polarity. It was also found that the GaInNAs lower doping levels in p-i-n solar cells grown at lowered As/III flux ratios were associated with increased carrier lifetimes.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Optoelectronics Research Centre, Research group: Semiconductor Technology and Applications
Contributors: Tukiainen, A., Aho, A., Polojärvi, V., Ahorinta, R., Guina, M.
Number of pages: 20
Pages: 113-132
Publication date: 2016
Peer-reviewed: Yes

Publication information

Journal: Journal of Green Engineering
Volume: 5
Issue number: 3-4
Article number: 8
ISSN (Print): 1904-4720
Ratings: 
  • Scopus rating (2016): CiteScore 0.36 SJR 0.132 SNIP 0.294
Original language: English
ASJC Scopus subject areas: Environmental Engineering, Energy(all), Physics and Astronomy(all), Materials Science(all)
Source: Scopus
Source ID: 84983050025

Research output: Contribution to journalArticleScientificpeer-review

Target tracking via combination of particle filter and optimisation techniques

Particle filters (PFs) have been used for the nonlinear estimation for a number of years. However, they suffer from the impoverishment phenomenon. It is brought by resampling which intends to prevent particle degradation, and therefore becomes the inherent weakness of this technique. To solve the problem of sample impoverishment and to improve the performance of the standard particle filter we propose a modification to this method by adding a sampling mechanism inspired by optimisation techniques, namely, the pattern search, particle swarm optimisation, differential evolution and Nelder-Mead algorithms. In the proposed methods, the true state of the target can be better expressed by the optimised particle set and the number of meaningful particles can be grown significantly. The efficiency of the proposed particle filters is supported by a truck-trailer problem. Simulations show that the hybridised particle filter with Nelder-Mead search is better than other optimisation approaches in terms of particle diversity.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, University of Toledo, Bowling Green State University
Contributors: Hosseini, S. S. S., Jamali, M. M., Astola, J., Gorsevski, P. V.
Number of pages: 18
Pages: 212-229
Publication date: 2016
Peer-reviewed: Yes

Publication information

Journal: International Journal of Mathematical Modelling and Numerical Optimization
Volume: 7
Issue number: 2
ISSN (Print): 2040-3607
Ratings: 
  • Scopus rating (2016): CiteScore 1.44 SJR 0.351 SNIP 0.935
Original language: English
ASJC Scopus subject areas: Numerical Analysis, Modelling and Simulation, Applied Mathematics
Keywords: Differential evolution, Nelder-Mead, Particle filter, Particle swarm optimisation, Pattern search, PSO, Target tracking
Source: Scopus
Source ID: 84990239582

Research output: Contribution to journalArticleScientificpeer-review

Surrogate modeling for initial rotational stiffness of welded tubular joints

Recently, buildings and structures erected in Russia and abroad have to comply with stringent economic requirements. Buildings should not only be reliable and safe, have a beautiful architectural design, but also meet the criteria of rationality and energy efficiency. In practice, this usually means the need for additional comparative analysis in order to determine the optimal solution to the engineering task. Usually such an analysis is time-consuming and requires huge computational efforts. In this regard, surrogate modeling can be an effective tool for solving such problems. This article provides a brief description of surrogate models and the basic techniques of their construction, describes the construction process of a surrogate model to calculate initial rotational stiffness of welded RHS joints made of high strength steel (HSS).

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering, Research group: Metal and Light-wight structures, Peter the Great St. Petersburg Polytechnic University, Peter Great St Petersburg Polytech Univ
Contributors: Garifullin, M. R., Barabash, A. V., Naumova, E. A., Zhuvak, O. V., Jokinen, T., Heinisuo, M.
Number of pages: 24
Pages: 53-76
Publication date: 2016
Peer-reviewed: Yes

Publication information

Journal: Magazine of Civil Engineering
Volume: 63
Issue number: 3
ISSN (Print): 2071-4726
Ratings: 
  • Scopus rating (2016): CiteScore 0.3 SJR 0.236 SNIP 0.755
Original language: English
ASJC Scopus subject areas: Civil and Structural Engineering
Keywords: Finite element analysis, Kriging, Plane bending, Square hollow section, Surrogate modeling

Bibliographical note

EXT="Garifullin, M. R."

Source: Scopus
Source ID: 84994045052

Research output: Contribution to journalArticleScientificpeer-review

Preparation and antimicrobial characterization of silver-containing packaging materials for meat

In food technology, antimicrobial packaging materials could inhibit or limit the growth of spoilage bacteria and thus improve the shelf life of packaged products. The present study provides new insights into the preparation and antimicrobial characterization of silver-containing packaging materials and their efficacy against typical meat spoilage bacteria. Antimicrobial efficacy of packaging films produced by coextrusion or liquid flame spray process was determined by bioluminescence imaging and conventional antimicrobial assay. Fresh pork sirloin was packaged in selected films and composition of meat microbiota was analyzed by 16S rRNA amplicon sequencing. Shelf life of meat was not affected by any of the silver-containing packaging films, even though meat microbiota mostly consisted of bacteria that were inhibited or retarded in vitro by nanoscale silver coating. This may be due to different release dynamics of silver ions on meat surfaces compared to the circumstances in the antimicrobial assay or interactions between silver and amino acids.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Materials Science, Research group: Paper Converting and Packaging, Department of Chemistry and Bioengineering, Engineering materials science and solutions (EMASS), Urban circular bioeconomy (UrCirBio), University of Helsinki, Department of Food Hygiene and Environmental Health
Contributors: Kuuliala, L., Pippuri, T., Hultman, J., Auvinen, S., Kolppo, K., Nieminen, T., Karp, M., Björkroth, J., Kuusipalo, J., Jääskeläinen, E.
Number of pages: 8
Pages: 53-60
Publication date: 1 Dec 2015
Peer-reviewed: Yes

Publication information

Journal: Food Packaging and Shelf Life
Volume: 6
Article number: 67
ISSN (Print): 2214-2894
Ratings: 
  • Scopus rating (2015): CiteScore 2.21 SJR 0.695 SNIP 0.947
Original language: English
ASJC Scopus subject areas: Food Science, Safety, Risk, Reliability and Quality, Biomaterials, Polymers and Plastics, Microbiology (medical)
Keywords: Active packaging, Antimicrobial film, Bioluminescence, Lactic acid bacteria, Liquid flame spray, Silver nanoparticle

Bibliographical note

ORG=mol,0.5
ORG=keb,0.5

Source: Scopus
Source ID: 84945244937

Research output: Contribution to journalArticleScientificpeer-review

LTCC-Based Multi-Electrode Arrays for 3D in Vitro Cell Cultures

Current technologies to monitor neuronal cultures in vitro are based on 2-dimensional (2D) multi-electrode arrays and cell cultures. The complexity of actual high-level neurobiological systems requires 3-dimensional (3D) cultures and 3D electrode arrays to improve our understanding of such systems. The realization calls for smart multilayer and packaging technology. Our approach uses low-temperature cofired ceramics (LTCC) for the design of a 3-dimensional multi-electrode array (3D MEA). An LTCC multilayer board with gold electrodes forms the basis of the system. The layout of the 3D MEA is designed to fit into widely used measurement adapters for 2D signal recordings, enabling data processing identical to that of established chips. Design and manufacturing of the new 3D device as a basic tool for the investigation of 3D cell cultures are described. Features of thick-film gold electrodes are characterized by means of microscopic and spectroscopic tools complemented with complex impedance measurements. Possible biological applications for in vitro electrophysiological measurements were evaluated based on cell cultures of primary neurons, seeded directly to the chip surface. It was shown that activity can be measured over six months.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Computational Biophysics and Imaging Group, BioMediTech, Integrated Technologies for Tissue Engineering Research (ITTE), TU Ilmenau, Technische Universitat Ilmenau, Inst Mikro & Nanotechnologien MacroNano, ETH, Swiss Federal Institute of Technology Zurich, Inst Biomed Engn, Lab Biosensors & Bioelect
Contributors: Bartsch, H., Himmerlich, M., Fischer, M., Demko, L., Hyttinen, J., Schober, A.
Number of pages: 10
Pages: 315-324
Publication date: Dec 2015
Peer-reviewed: Yes

Publication information

Journal: Journal of Ceramic Science and Technology
Volume: 6
Issue number: 4
ISSN (Print): 2190-9385
Ratings: 
  • Scopus rating (2015): CiteScore 0.53 SJR 0.237 SNIP 0.434
Original language: English
Keywords: Low-temperature cofired ceramics (LTCC), three-dimensional hybrid multi-electrode array (3D MEA), in vitro cell culture, thick-film gold electrode, primary neuron culture, GROWTH
Source: WOS
Source ID: 000367422100010

Research output: Contribution to journalArticleScientificpeer-review

Time-resolved characterization of primary and secondary particle emissions of a modern gasoline passenger car

Changes in traffic systems and vehicle emission reduction technologies significantly affect traffic-related emissions in urban areas. In many densely populated areas the amount of traffic is increasing, keeping the emission level high or even increasing. To understand the health effects of traffic related emissions, both primary and secondary particles that are formed in the atmosphere from gaseous exhaust emissions need to be characterized. In this study we used a comprehensive set of measurements to characterize both primary and secondary particulate emissions of a modern gasoline passenger car. Our aerosol particle study covers the whole process chain in emission formation, from the engine to the atmosphere, and takes into account also differences in driving patterns. We observed that in mass terms, the amount of secondary particles was 13 times higher than the amount of primary particles. The formation, composition, number, and mass of secondary particles was significantly affected by driving patterns and engine conditions. The highest gaseous and particulate emissions were observed at the beginning of the test cycle when the performance of the engine and the catalyst was below optimal. The key parameter for secondary particle formation was the amount of gaseous hydrocarbons in primary emissions; however, also the primary particle population had an influence. Thus, in order to enhance human health and wellbeing in urban areas, our study strongly indicates that in future legislation, special attention should be directed into the reduction of gaseous hydrocarbons.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Research area: Aerosol Physics, Finnish Meteorological Institute, Helsinki, VTT Technical Research Centre of Finland, Pennsylvania State University, Atmospheric Composition Research, Finnish Meteorological Institute
Contributors: Karjalainen, P., Timonen, H., Saukko, E., Kuuluvainen, H., Saarikoski, S., Aakko-Saksa, P., Murtonen, T., Dal Maso, M., Ahlberg, E., Svenningsson, B., Brune, W. H., Hillamo, R., Keskinen, J., Rönkkö, T.
Number of pages: 29
Pages: 33253-33282
Publication date: 25 Nov 2015
Peer-reviewed: Yes

Publication information

Journal: Atmospheric Chemistry and Physics Discussions
Volume: 15
Issue number: 22
ISSN (Print): 1680-7367
Ratings: 
  • Scopus rating (2015): SNIP 0.101
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

SimpleTree: An Efficient Open Source Tool to Build Tree Models from TLS Clouds

An open source tool named SimpleTree, capable of modelling highly accurate cylindrical tree models from terrestrial laser scan point clouds, is presented and evaluated. All important functionalities, accessible in the software via buttons and dialogues, are described including the explanation of all necessary input parameters. The method is validated utilizing 101 point clouds of six different tree species, in the main evergreen and coniferous trees. All scanned trees have been destructively harvested to get accurate estimates of above ground biomass with which we assess the accuracy of the SimpleTree-reconstructed cylinder models. The trees were grouped into four data sets and for each one a Concordance Correlation Coefficient of at least 0.92 (0.92, 0.97, 0.92, 0.94) and an total relative error at most ~8 % (2.42%, 3.59%, –4.59%, 8.27%) was achieved in the comparison of the model results to the ground truth data. A global statistical improvement of derived cylinder radii is presented as well as an efficient optimization approach to automatically improve user given input parameters. An additional check of the SimpleTree results is presented via comparison to the results of trees reconstructed using an alternative, published method.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Mathematics, Research group: MAT Inverse Problems, Mathematical modelling with wide societal impact (MathImpact)
Contributors: Hackenberg, J., Spiecker, H., Calders, K., Disney, M., Raumonen, P.
Number of pages: 50
Pages: 4245-4294
Publication date: 23 Nov 2015
Peer-reviewed: Yes

Publication information

Journal: Forests: Open Access Journal
Volume: 6
Issue number: 11
ISSN (Print): 1999-4907
Ratings: 
  • Scopus rating (2015): CiteScore 1.76 SJR 0.633 SNIP 0.761
Original language: English
URLs: 

Research output: Contribution to journalArticleScientificpeer-review

Energy Retrofits in Multi-family Buildings in North-east Europe: The Impacts on Thermal Conditions

We have conducted a project to develop a common protocol for indoor environmental quality (IEQ) assessment and to assess the effects of energy retrofits on IEQ. This paper focuses on thermal comfort, which was first assessed based on 2-month continuous monitoring in 16 multi-family buildings (94 apartments) in Finland and 20 buildings (96 apartments) in Lithuania during heating season before retrofits. In addition, corresponding data after retrofits were available from three buildings (17 apartments) from Finland and seven (30 apartments) from Lithuania. Two data loggers per apartment were placed to evaluate Tw and RHw (warm area), and Tc and RHc (coldest spot). Questionnaire data regarding housing quality and health were collected from the occupants. The results before retrofits indicated high Tw (>23 ºC) for a large proportion of time in Finnish apartments, whereas opposite trend was observed in Lithuania. After retrofits, proportion of time with high Tw was higher while proportion of apartments with low RHw was lower in Finland, whereas in Lithuania, about one fourth of the apartments had higher Tw and RHw, hence fulfilling the national guidelines. The average absolute humidity was higher after retrofits in both countries, especially in Lithuania (by 15%). Occupant responses indicated improved thermal comfort. Therefore, potential effects of energy retrofits on occupants’ thermal environment and satisfaction were demonstrated, and simply adjusting indoor temperature could help to save energy. Further analysis is needed to include the effects of outdoor conditions, as well as overall IEQ to the assessment.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Life Cycle Effectiveness of the Built Environment (LCE@BE), Research group: Concrete and Bridge Structures, Research area: Structural Engineering, Department of Civil Engineering, Research group: Building Physics, Natl Inst Hlth & Welf, Finland National Institute for Health & Welfare, Dept Hlth Protect, Kaunas Univ Technol, Kaunas University of Technology, Dept Environm Technol
Contributors: Du, L., Leivo, V., Prasauskas, T., Turunen, M., Kiviste, M., Martuzevicius, D., Haverinen-Shaughnessy, U.
Number of pages: 5
Pages: 860-864
Publication date: Nov 2015
Peer-reviewed: Yes

Publication information

Journal: Energy Procedia
Volume: 78
ISSN (Print): 1876-6102
Ratings: 
  • Scopus rating (2015): CiteScore 0.92 SJR 0.359 SNIP 0.562
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Building new computational models to support health behavior change and maintenance: new opportunities in behavioral research

Adverse and suboptimal health behaviors and habits are responsible for approximately 40 % of preventable deaths, in addition to their unfavorable effects on quality of life and economics. Our current understanding of human behavior is largely based on static “snapshots” of human behavior, rather than ongoing, dynamic feedback loops of behavior in response to ever-changing biological, social, personal, and environmental states. This paper first discusses how new technologies (i.e., mobile sensors, smartphones, ubiquitous computing, and cloud-enabled processing/computing) and emerging systems modeling techniques enable the development of new, dynamic, and empirical models of human behavior that could facilitate just-in-time adaptive, scalable interventions. The paper then describes concrete steps to the creation of robust dynamic mathematical models of behavior including: (1) establishing “gold standard” measures, (2) the creation of a behavioral ontology for shared language and understanding tools that both enable dynamic theorizing across disciplines, (3) the development of data sharing resources, and (4) facilitating improved sharing of mathematical models and tools to support rapid aggregation of the models. We conclude with the discussion of what might be incorporated into a “knowledge commons,” which could help to bring together these disparate activities into a unified system and structure for organizing knowledge about behavior.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Research group: Personal Health Informatics-PHI, Research Community on Data-to-Decision (D2D), University of Southern California, Arizona State University, Northeastern University, National Institutes of Health, Bethesda, Northwestern University, Wharton School, University of Pennsylvania, Scientific Institute Hospital San Raffaelle, Valencia Polytechnical University, Columbia University in the City of New York, VTT Technical Research Centre of Finland
Contributors: Spruijt-Metz, D., Hekler, E., Saranummi, N., Intille, S., Korhonen, I., Nilsen, W., Rivera, D. E., Spring, B., Michie, S., Asch, D. A., Sanna, A., Salcedo, V. T., Kukakfa, R., Pavel, M.
Number of pages: 12
Pages: 335-346
Publication date: 17 Sep 2015
Peer-reviewed: Yes

Publication information

Journal: Translational Behavioral Medicine
Volume: 5
Issue number: 3
ISSN (Print): 1869-6716
Ratings: 
  • Scopus rating (2015): CiteScore 1.63 SJR 0.754 SNIP 0.838
Original language: English
ASJC Scopus subject areas: Behavioral Neuroscience, Applied Psychology
Keywords: Computational models of behavior, Connected health, Health-related behavior, Just-in-time adaptive interventions, mHealth, Mobile health, Real-time interventions

Bibliographical note

EXT="Saranummi, Niilo"

Source: Scopus
Source ID: 84939204163

Research output: Contribution to journalArticleScientificpeer-review

Effects of subsampling on characteristics of RNA‑seq data from triple‑negative breast cancer patients

Background: Data from RNA-seq experiments provide a wealth of information about the transcriptome of an organism. However, the analysis of such data is very demanding. In this study, we aimed to establish robust analysis procedures that can be used in clinical practice. Methods: We studied RNA-seq data from triple-negative breast cancer patients. Specifically, we investigated the subsampling of RNA-seq data. Results: The main results of our investigations are as follows: (1) the subsampling of RNA-seq data gave biologically realistic simulations of sequencing experiments with smaller sequencing depth but not direct scaling of count matrices; (2) the saturation of results required an average sequencing depth larger than 32 million reads and an individual sequencing depth larger than 46 million reads; and (3) for an abrogated feature selection, higher moments of the distribution of all expressed genes had a higher sensitivity for signal detection than the corresponding mean values. Conclusions: Our results reveal important characteristics of RNA-seq data that must be understood before one can apply such an approach to translational medicine.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Queen's University, Belfast, Northern Ireland, University of Arkansas for Medical Sciences
Contributors: Stupnikov, A., Glazko, G. V., Emmert-Streib, F.
Publication date: 8 Sep 2015
Peer-reviewed: Yes

Publication information

Journal: Chinese Journal of Cancer
Volume: 34
Issue number: 10
ISSN (Print): 1944-446X
Ratings: 
  • Scopus rating (2015): CiteScore 2.63 SJR 1.081
Original language: English
ASJC Scopus subject areas: Oncology
Keywords: Computational genomics, High-dimensional biology, RNA-seq data, Statistical robustness, Triple-negative breast cancer
Source: Scopus
Source ID: 84944199836

Research output: Contribution to journalArticleScientificpeer-review

Towards a Classification Schema for Development Technologies: an Empirical Study in the Avionic Domain

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: University of Kaiserslautern, Free University of Bozen-Bolzano, Free University of Bolzano-Bozen, Liebherr-Aerospace
Contributors: Taibi, D., Lenarduzzi, V., Dieudonne, L., Plociennik, C.
Number of pages: 11
Pages: 125-135
Publication date: 1 Aug 2015
Peer-reviewed: Yes

Publication information

Journal: INTERNATIONAL JOURNAL ON ADVANCES IN SOFTWARE
Volume: 8
Issue number: 1&2
ISSN (Print): 1942-2628
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

The effects of neuron morphology on graph theoretic measures of network connectivity: The analysis of a two-level statistical model

We developed a two-level statistical model that addresses the question of how properties of neurite morphology shape the large-scale network connectivity. We adopted a low-dimensional statistical description of neurites. From the neurite model description we derived the expected number of synapses, node degree, and the effective radius, the maximal distance between two neurons expected to form at least one synapse. We related these quantities to the network connectivity described using standard measures from graph theory, such as motif counts, clustering coefficient, minimal path length, and small-world coefficient. These measures are used in a neuroscience context to study phenomena from synaptic connectivity in the small neuronal networks to large scale functional connectivity in the cortex. For these measures we provide analytical solutions that clearly relate different model properties. Neurites that sparsely cover space lead to a small effective radius. If the effective radius is small compared to the overall neuron size the obtained networks share similarities with the uniform random networks as each neuron connects to a small number of distant neurons. Large neurites with densely packed branches lead to a large effective radius. If this effective radius is large compared to the neuron size, the obtained networks have many local connections. In between these extremes, the networks maximize the variability of connection repertoires. The presented approach connects the properties of neuron morphology with large scale network properties without requiring heavy simulations with many model parameters. The two-steps procedure provides an easier interpretation of the role of each modeled parameter. The model is flexible and each of its components can be further expanded. We identified a range of model parameters that maximizes variability in network connectivity, the property that might affect network capacity to exhibit different dynamical regimes.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research group: Computational Neuro Science-CNS, Department of Signal Processing, University of Oslo
Contributors: Acimovic, J., Mäki-Marttunen, T., Linne, M.
Publication date: 10 Jun 2015
Peer-reviewed: Yes

Publication information

Journal: Frontiers in Neuroanatomy
Volume: 9
Issue number: June
Article number: 76
ISSN (Print): 1662-5129
Ratings: 
  • Scopus rating (2015): CiteScore 2.73 SJR 1.852 SNIP 0.782
Original language: English
ASJC Scopus subject areas: Anatomy, Neuroscience (miscellaneous), Cellular and Molecular Neuroscience
Keywords: Graph theory, Motifs, Network connectivity, Neurite density field, Neuron morphology, Theoretical model
Source: Scopus
Source ID: 84935865748

Research output: Contribution to journalArticleScientificpeer-review

Distributed power allocation over indoor multi-pico stations

A low-complexity distributed power allocation algorithm is proposed to reduce the interference and improve the transmitting rate of edge users. Different scenarios are considered and user experience of indoor communication is promoted. The simulation results prove the effectiveness of our algorithm. The proposed power control scheme ensures that more users can achieve their required rate and the fairness of different users is improved. Besides, more than 50% energy can be saved without loss in outage ability, and energy efficiency is also promoted. In addition, the proposed algorithm can be extended to scenarios that the required rates of pico stations can be changed periodically.

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, Beijing Institute of Petrochemical Technology, School of Information and Electronics, Beijing Institute of Technology
Contributors: Fei, Z. S., Gao, Q., Fu, Y., Isotalo, T., Niemelä, J.
Number of pages: 6
Pages: 227-232
Publication date: 1 Jun 2015
Peer-reviewed: Yes

Publication information

Journal: Journal of the Beijing Institute of Technology
Volume: 24
Issue number: 2
ISSN (Print): 1004-0579
Ratings: 
  • Scopus rating (2015): CiteScore 0.1 SJR 0.153 SNIP 0.163
Original language: English
ASJC Scopus subject areas: Engineering(all)
Keywords: Distributed power allocation, Indoor communication, Multi-pico stations
Source: Scopus
Source ID: 84940670650

Research output: Contribution to journalArticleScientificpeer-review

Microrobotic system for multi-rate measurement of bio-based fibres Z-directional bond strength

The core content of this study is micro-testing of microscale objects - an emerging application area for microrobotics - where microrobotics has been used in paper industry for measuring properties at the single fibre level. Pulp and paper scientists are interested to have experimental data of single fibre-fibre bond strength distribution of paper/board products in different loading modes and rates. Meeting this demand is quite challenging since the system should be able to measure the bond strength i) in the individual fibre level, ii) in different loading modes, and iii) in different loading rates. The current methods of measurement do not satisfy all these three requirements. Among the four different loading modes, the Z-directional behaviour of paper/board products is a matter of high significance for papermaking and paper converting companies. The Z-directional properties influence compressive properties, and accordingly the performance of structural paper/board products. According to the literature, there is not any reported method to facilitate the measurement of Z-directional strength at the single fibre level in different loading rates. This paper reports an in-depth study of a measurement method for experimental evaluation of Z-directional individual fibre-fibre bond strength in multiple loading rates using microrobotics and a Polyvinylidene fluoride (PVDF) film microforce sensor. The results from the measurement system are promising. In summary, the first concept for multi-rate measurement of Z-directional bond strength at the individual fibre level is developed during this work which has a high practical impact on the fibre characterization research field.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Automation Science and Engineering, Research area: Microsystems, Research area: Measurement Technology and Process Control
Contributors: Latifi, S. K., Saketi, P., Kallio, P.
Number of pages: 14
Pages: 13-26
Publication date: 24 May 2015
Peer-reviewed: Yes

Publication information

Journal: Journal of Micro-Bio Robotics
Volume: 10
Issue number: 1
Article number: 1
ISSN (Print): 2194-6418
Ratings: 
  • Scopus rating (2015): CiteScore 1 SJR 0.423 SNIP 1.004
Original language: English
ASJC Scopus subject areas: Engineering(all)
Keywords: Microrobotics , Micro-testing , Multi-rate microforce sensing, Polyvinylidene fluoride (PVDF) , Z-directional strength

Research output: Contribution to journalArticleScientificpeer-review

Cancer research in the era of next-generation sequencing and big data calls for intelligent modeling

We examine the role of big data and machine learning in cancer research. We describe an example in cancer research where gene-level data from The Cancer Genome Atlas (TCGA) consortium is interpreted using a pathway-level model. As the complexity of computational models increases, their sample requirements grow exponentially. This growth stems from the fact that the number of combinations of variables grows exponentially as the number of variables increases. Thus, a large sample size is needed. The number of variables in a computational model can be reduced by incorporating biological knowledge. One particularly successful way of doing this is by using available gene regulatory, signaling, metabolic, or context-specific pathway information. We conclude that the incorporation of existing biological knowledge is essential for the progress in using big data for cancer research.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Signal Processing, Research group: Computational Systems Biology
Contributors: Yli-Hietanen, J., Ylipää, A., Yli-Harja, O.
Publication date: 11 Apr 2015
Peer-reviewed: Yes

Publication information

Journal: Chinese Journal of Cancer
Volume: 34
Issue number: 10
Article number: 12
ISSN (Print): 1944-446X
Ratings: 
  • Scopus rating (2015): CiteScore 2.63 SJR 1.081
Original language: English
Keywords: Cancer research, Big data, Mathematical modeling, GASTRIC-CANCER, MODULES
Source: WOS
Source ID: 000360225300001

Research output: Contribution to journalArticleScientificpeer-review

Testing the near field/far field model performance for prediction of particulate matter emissions in a paint factory

A Near Field/Far Field (NF/FF) model is a well-accepted tool for precautionary exposure assessment but its capability to estimate particulate matter (PM) concentrations is not well studied. The main concern is related to emission source characterization which is not as well defined for PM emitters compared to e.g. for solvents. One way to characterize PM emission source strength is by using the material dustiness index which is scaled to correspond to industrial use by using modifying factors, such as handling energy factors. In this study we investigate how well the NF/FF model predicts PM concentration levels in a paint factory. PM concentration levels were measured during big bag and small bag powder pouring. Rotating drum dustiness indices were determined for the specific powders used and applied in the NF/FF model to predict mass concentrations. Modeled process specific concentration levels were adjusted to be similar to the measured concentration levels by adjusting the handling energy factor. The handling energy factors were found to vary considerably depending on the material and process even-though they have the same values as modifying factors in the exposure models. This suggests that the PM source characteristics and process-specific handling energies should be studied in more detail to improve the model-based exposure assessment.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Danmarks Tekniske Universitet, DTU Informatik, Denmark Technical University DTU, National Research Centre for the Working Environment, Department of Micro and Nanotechnology
Contributors: Koivisto, A. J., Jensen, A. C. Ø., Levin, M., Kling, K. I., Maso, M. D., Nielsen, S. H., Jensen, K. A., Koponen, I. K.
Number of pages: 12
Pages: 62-73
Publication date: 1 Jan 2015
Peer-reviewed: Yes

Publication information

Journal: Environmental Sciences: Processes and Impacts
Volume: 17
Issue number: 1
ISSN (Print): 2050-7887
Ratings: 
  • Scopus rating (2015): CiteScore 2.5 SJR 0.998 SNIP 0.923
Original language: English
ASJC Scopus subject areas: Environmental Chemistry, Public Health, Environmental and Occupational Health, Management, Monitoring, Policy and Law, Medicine(all)

Bibliographical note

EXT="Koivisto, A. J."

Source: Scopus
Source ID: 84920000979

Research output: Contribution to journalArticleScientificpeer-review

Acquisition of E5 Galileo signals in Matlab

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Research group: Wireless Communications and Positioning, Department of Electronics and Communications Engineering, Wireless Communications and Positioning (WICO)
Contributors: Stepanova, E., Kudryavtsev, I., Lohan, E.
Number of pages: 7
Pages: 36-42
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Engineering
Volume: 104
ISSN (Print): 1877-7058
Ratings: 
  • Scopus rating (2015): CiteScore 0.56 SJR 0.239 SNIP 0.566
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Comparison of Detection Techniques for Multipath Propagation of Pseudolite Signals Used in Dense Industrial Environments

Modern industrial environments with automated production machinery often require special indoor positioning and localization techniques, due t. The presence of objects and o. The infrastructure that may obstruc. The line-of-sight propagation or interfere wit. The behaviour of electromagnetic waves. These challenges are difficult to overcome b. The widely employed GNSS positioning system designed for use in outdoor areas. One of existing indoor positioning systems ar. The pseudolites, which transmit positioning signals similar t. The ones used by GNSS systems. One o. The sources of errors for pseudolites i. The multipath propagation. Our paper compare. The performances of several multipath propagation detection techniques, using Binary Offset Carrier (BOC) navigation signal and determines that errors increases sharply whe. The receiver uses navigation signals that have multipath propagation. The techniques that we present improv. The positioning accuracy, which leads to more precise industrial processes.

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, Ministry of National Education. University Politehnica of Bucharest
Contributors: Alexandru, R., Lohan, E.
Number of pages: 7
Pages: 1294-1300
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Engineering
Volume: 100
Issue number: C
ISSN (Print): 1877-7058
Ratings: 
  • Scopus rating (2015): CiteScore 0.56 SJR 0.239 SNIP 0.566
Original language: English
ASJC Scopus subject areas: Energy(all)
Keywords: Binary Offset Carrier, GNSS, Indoor positioning, Multipath propagation, Pseudolite
Source: Scopus
Source ID: 84925047361

Research output: Contribution to journalArticleScientificpeer-review

Entropy of weighted graphs with Randić weights

Shannon entropies for networks have been widely introduced. However, entropies for weighted graphs have been little investigated. Inspired by the work due to Eagle et al., we introduce the concept of graph entropy for special weighted graphs. Furthermore, we prove extremal properties by using elementary methods of classes of weighted graphs, and in particular, the one due to Bollobás and Erdös, which is also called the Randić weight. As a result, we derived statements on dendrimers that have been proven useful for applications. Finally, some open problems are presented.

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), Department of Computer Science & Information Systems, University of Limerick, Ireland, College of Computer and Control Engineering, Nankai University, Universität der Bundeswehr München, Department of Mechatronics and Biomedical Computer Science, UMIT, Center for Combinatorics and LPMC-TJKLC
Contributors: Chen, Z., Dehmer, M., Emmert-Streib, F., Shi, Y.
Number of pages: 14
Pages: 3710-3723
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Entropy
Volume: 17
Issue number: 6
ISSN (Print): 1099-4300
Ratings: 
  • Scopus rating (2015): CiteScore 1.99 SJR 0.551 SNIP 1.116
Original language: English
ASJC Scopus subject areas: Physics and Astronomy(all)
Keywords: Extremal value, Graph entropy, Randić weight, Shannon's entropy, Weighted graphs
Source: Scopus
Source ID: 84934300047

Research output: Contribution to journalArticleScientificpeer-review

Assessing coupling dynamics from an ensemble of time series

Finding interdependency relations between time series provides valuable knowledge about the processes that generated the signals. Information theory sets a natural framework for important classes of statistical dependencies. However, a reliable estimation from information-theoretic functionals is hampered when the dependency to be assessed is brief or evolves in time. Here, we show that these limitations can be partly alleviated when we have access to an ensemble of independent repetitions of the time series. In particular, we gear a data-efficient estimator of probability densities to make use of the full structure of trial-based measures. By doing so, we can obtain time-resolved estimates for a family of entropy combinations (including mutual information, transfer entropy and their conditional counterparts), which are more accurate than the simple average of individual estimates over trials. We show with simulated and real data generated by coupled electronic circuits that the proposed approach allows one to recover the time-resolved dynamics of the coupling between different subsystems.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Mathematics, University of Electronic Science and Technology of China, Institute of Computer Science (ICS) of the Foundation for Research and Technology - Hellas (FORTH), Lab of Neurophysics and Neurophysiology, Hefei National Laboratory for Physical Sciences at the Microscale, Instituto de Fisica Interdisciplinar y Sistemas Complejos (CSIC-UIB), Campus Universitat de les Illes Balears, Institut für Kognitionswissenschaft, University of Osnabrück, University of Tartu, Netherlands Institute for Neuroscience
Contributors: Gómez-Herrero, G., Wu, W., Rutanen, K., Soriano, M. C., Pipa, G., Vicente, R.
Number of pages: 13
Pages: 1958-1970
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Entropy
Volume: 17
Issue number: 4
ISSN (Print): 1099-4300
Ratings: 
  • Scopus rating (2015): CiteScore 1.99 SJR 0.551 SNIP 1.116
Original language: English
ASJC Scopus subject areas: Physics and Astronomy(all)
Keywords: Ensemble, Entropy, Estimator, Time series, Transfer entropy, Trial

Bibliographical note

EXT="Gómez-Herrero,Germán"

Source: Scopus
Source ID: 84930319366

Research output: Contribution to journalArticleScientificpeer-review

Cross-Cultural Design of Mobile Mathematics Learning Service for South African Schools

In the era of mobile devices and services, researchers in the educational domain have been interested in how to support learning with mobile technology in both local and global contexts. Recent human-computer interaction (HCI) research in the educational domain has particularly focused on how to develop mobile learning services and how to evaluate the learning outcomes. However, learning occurs in a local cultural context and the impact of culturally sensitive issues of the design of mobile learning needs more attention. We studied mobile mathematics learning -service in a longitudinal research with over 30 South African schools during three years. Our aim was to understand culturally dependent issues which need to be taken into consideration in the design of mobile learning services. We found subjective and objective culturally dependent issues in the content, context, infrastructure and technology of mobile learning and therefore, subjects to cross-cultural research. In conclusion, we argue that localization enhances the user experience and therefore support learning.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Pervasive Computing, Research area: User experience, University of Tampere
Contributors: Vainio, T., Walsh, T., Varsaluoma, J.
Number of pages: 12
Pages: 81-93
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: IADIS International Journal on WWW/Internet
Volume: 12
Issue number: 1
ISSN (Print): 1645-7641
Original language: English
Keywords: Cross-Cultural Design, Mobile Learning, Cultural Context, Subjective and Objective Culture

Bibliographical note

EXT="Vainio, Teija"

Research output: Contribution to journalArticleScientificpeer-review

Relational Capital for Shared Vision in Innovation Ecosystems

This paper provides a multiscopic view of the relationship profiles of businesses in three selected urban innovation ecosystems. With the Triple Helix framework, the ecosystem perspective and with shared vision for transformation initiatives, we explore relationships as structure in the metropolitan areas of Austin, TX, Minneapolis, MN, and Paris, France. Network metrics are interpreted as relationship indicators; and network visualizations reveal existing relationships and distinct patterns that structure the business ecosystems in each geographic area at the enterprise, growth and startup levels. We illustrate that relationship indicators and their visualization can be valuable resources for quantitatively and qualitatively understanding and analyzing the complexities of engagement, agility, structural cohesion, vitality, embeddedness, and linking factors in innovation ecosystems. Furthermore, these indicators highlight opportunities for the development of shared vision through interventions and network orchestration.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Mathematics, Research group: MAT Intelligent Information Systems Laboratory
Contributors: Russell, M. G., Huhtamäki, J., Still, K., Rubens, N., Basole, R. C.
Number of pages: 36
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Triple Helix: A Journal of University-Industry-Government Innovation and Entrepreneurship
Volume: 2
Issue number: 1
ISSN (Print): 2197-1927
Original language: English
Keywords: Ecosystem, Networks, Innovation, Business, Metropolitan, Relationships, Visualization
Source: RIS
Source ID: urn:F38A9FE4A6D713DF7D7D6341B47D22C2

Research output: Contribution to journalArticleScientificpeer-review

Heat Loss Rate of the Finnish Building Stock

This paper presents a bottom-up model for studying the heat loss rate of the building stock.The model is a step towards more complex building-stock power modeling, whose goal is topredictthe sources and the amount of demand response potential under different conditions. The heat loss rate is the fraction of thermal power needed to compensate for the heat loss via exterior walls, windows, roofs, floors and ventilation in the buildings. The heat loss rate depends on the physical characteristics of the building envelope and ventilation andon weather conditions.

We first examine the current state of power and energy modeling. We then describe the research object of this study and the calculation method. The calculation results presented in the third section are illustrated at the hourly level, sorted by the main source of the heating energy of the building. In addition to the analysis of the building stock level, the heat loss rate was calculated on a building level using some typical building information models for validation purposes. The validation indicated that the results obtained with the two methods were consistent and that the order of magnitude was reasonable. The Finnish building stock was used as a research object in the demonstration of the model. Finally, some further needs for research are discussed.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering, Research group: Real estate development, Research group: Capacity Development of Water and Environmental Services CADWES, Research group: Service Life Engineering of Structures
Contributors: Vihola, J., Sorri, J., Heljo, J., Kero, P.
Number of pages: 8
Pages: 601-608
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
Source: RIS
Source ID: urn:16F0384ED693DEFF48B71B73D5740E05

Research output: Contribution to journalArticleScientificpeer-review

Management and Planning Under Complexities of Metro Construction

Nowadays, the majority of construction projects can be considered as complex and ambiguous endeavours. Each kind ofconstruction project has its own characteristics and complexities whereas then specific management approaches and solutions are needed. Regarding the rapid development of cities, underground constructions at urban regions, such as metro construction, have been largely used for extending daily human life into underground spaces. Therefore, the recognition of the complex elements of a metro construction can play a significant role in its management and planning. The aim of this study is to investigate these complexities in subway construction. This may develop the possibility of high predictability for these challenges. As metro projects are also urban underground projects, both internal and external issues are studiedand their impacts on project management are discussed. It is concluded that exceptional differences in the managing and planning of these constructions isthatcombinedinternal and external complexities are carried out simultaneously.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering
Contributors: Khosravi, M., Kähkönen, K.
Number of pages: 7
Pages: 415-421
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
Keywords: Complexities, construction management, construction planning, metro construction, underground construction.

Bibliographical note

EXT=" Khosravi, Mahdi"

Source: RIS
Source ID: urn:CC947509283DD701C463455CFB0539A5

Research output: Contribution to journalArticleScientificpeer-review

Human Factor in Time Management

Abstract Time is the most important resource for leaders. Resources such as personnel, capital or facilities are crucial for leaders, but time is imperative. People's productivity, and hence organizations performance are heavily related to their time usage. Therefore, especially leaders should have conscious awareness towards their time personality. Time, however, is not an easy concept to handle for leader or even understand it. It has many different faces towards people. The challenge is that chronological time, where the business and management are done, is not nearly suitable when human relations and leadership are handled. Individuals experiences towards time differentiates to one another and different situations are constantly changing the experience of individual. Therefore, quite often, leaders recognize that it is hard to have schedules to match or plans to actualize within an agreed time. Some people fit more easily to same time reality with leader than others. Consequently, it is crucial for leaders also to understand how organization's members experience their time and how conscious their awareness is. Before it is possible to manage one's own time usage, personal time orientation, biases towards time, situation has to be understood consciously. This article handles research regarding time ontology in leadership and management environment and regarding peoples conscious awareness towards time and differences in their time reality. Research is done by developing and utilizing application called Chronos & Kairos which main purpose is to give possibility for thorough research for peoples’ differences when experiencing time. Time ontology for leadership and management environment is presented as well as research and results of differences of people's time reality. Article argues that people's conscious awareness towards time differentiates and this issues should be recognized especially in leadership positions. Future research aspects and recommendations are also issued in this paper.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Pori Department
Contributors: Reunanen, T.
Number of pages: 8
Pages: 709-716
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Manufacturing
Volume: 3
ISSN (Print): 2351-9789
Original language: English
Keywords: Time, Management, Human factor, Leadership, Situationality

Bibliographical note

INT=pla,"Reunanen, Tero"

Source: RIS
Source ID: urn:6D4C24C5CCDB54B2E73B8973CD08FBFE

Research output: Contribution to journalArticleScientificpeer-review

Monitoring urban air quality with a diffusion charger based electrical particle sensor

Abstract Urban air contains considerable amounts of harmful gaseous substances and aerosol particles. In this study, a recently introduced diffusion charger based PPS-M particle sensor (Pegasor Oy, Tampere, Finland) was evaluated for outdoor air quality measurements in urban environment. The PPS-M particle sensor was used in two stationary air quality measurement stations, one located in the roadside environment and the other in residential area, and in a mobile laboratory. The sampling of urban aerosol to the PPS-M sensor was performed without any pre-conditioning of aerosol. The sensor response to PM2.5 varied between the measurements, being between 7 and 30 fA/(µg/m3) depending on the aerosol source. The highest PM2.5 response was observed in the roadside study for exhaust particles while the lowest PM2.5 response was observed for large long range transported aerosol particles having relatively large mean particle size. The sensor signal was found to produce very linear response, with only minimal deviation, to the lung deposited particle surface area concentration (from 4.5 to 6 fA/(µm2/cm3)) and to the condensation sink of urban air particles (from 1.0 × 104 to 1.2 × 104 fA cm3). The sensor response to particle number concentration was defined to be 0.0044 fA/(1/cm3) in roadside environment. In this environment, the signal was found to correlate also with NO and NO2 concentrations of roadside air due to the same origin of particulate and gaseous pollutants. Similar correlation between NOx and the PPS-M signal was not observed in residential area.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Physics, Department of Signal Processing, Research area: Aerosol Physics, Urban circular bioeconomy (UrCirBio)
Contributors: Järvinen, A., Kuuluvainen, H., Niemi, J., Saari, S., Dal Maso, M., Pirjola, L., Hillamo, R., Janka, K., Keskinen, J., Rönkkö, T.
Publication date: 2015
Peer-reviewed: Yes
Early online date: 2014

Publication information

Journal: Urban Climate
Volume: 14
Issue number: 3
ISSN (Print): 2212-0955
Ratings: 
  • Scopus rating (2015): CiteScore 2.23 SJR 0.879 SNIP 1.032
Original language: English
Keywords: Particle sensor, Urban air quality, Traffic emissions, Instrument comparison

Bibliographical note

ORG=fys,0.5
ORG=sgn,0.5

Source: RIS
Source ID: urn:C09F5E550C75A3945CB60BFFC830456C

Research output: Contribution to journalArticleScientificpeer-review

Stirring the Construction Project Management with Co-creation and Continuous Improvement

Abstract Gathering information that is capable to explain customers’ needs is usually seen as a quite straightforward part of the traditional construction process: a customer should be able to tell all relevant needs in the first stage so that a building could be designed and built according to the gained information. But the process is lacking of service abilities if a customer wants to modify the given information due to a change in circumstances, albeit such a change is easily caused due turbulent economic situations and long spans in real-estate development projects. Hence the customer perspective regarding the construction management (CM) process should be accommodated better. In this paper, the case studies of the four premises improvement projects are reported upon, where the CM process was altered to include and apply the concepts of continuous improvement and co-creation. The process documentation covered the impacts of the case project on the usability of the premises, the indoor climate conditions (carbon dioxide and temperature) metering, the time lapse cameras and the on-line user feedback system. The documentation consists of the minutes of the meetings, the financial reporting and the time tables.Both the processes and the results of the projects are analysed. Based on the key findings, some suggestions are put forth upon how to improve the CM process to better serve customer interests and quality improvement in the future.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering, Research group: Digitalization in the real estate and construction sector, School of Architecture
Contributors: Savolainen, J., Kähkönen, K., Niemi, O., Poutanen, J., Varis, E.
Number of pages: 8
Pages: 64-71
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
Keywords: Co-creation, construction management, continuous improvement, customer relations management, quality management

Bibliographical note

ORG=rak,1
ORG=ark,0

Source: RIS
Source ID: urn:76EF98A938A43DE456AFD5111BF4116C

Research output: Contribution to journalArticleScientificpeer-review

Theoretical 71-Concept Platform for Advancing Construction-related Business Management

Abstract The aim is to advance business management (BM) in constructionvia the independent literature review. 71 construction-related BM concepts have been published between 1990 and 2013. Focal firms are based in the OECD countries. 34 (48%) concepts are related to construction management (CM), 14 (20%) concepts to industrial management and international marketing, 12 (17%) concepts to project management (PM) and 11 (15%) concepts to corporate real estate. The combined share of 16 Porterian, 16 dynamism-based, 15 organisation-based, and 10 knowledge-based concepts is 81%. The 71-concept platform is neither highly theoretically advanced, nor highly applicable. The propositions are defined for advancement.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering, Research group: Digitalization in the real estate and construction sector
Contributors: Huovinen, P.
Number of pages: 8
Pages: 80-87
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
ASJC Scopus subject areas: Business, Management and Accounting(all)
Keywords: Applied research, business management, conceptualisation, construction, literature review, real estate, school of thought
Source: RIS
Source ID: urn:2259E842B1A87C3870EDBE85F572BB11

Research output: Contribution to journalArticleScientificpeer-review

Safety, Space and Structure Quality Requirements in Construction Scheduling

Abstract Quality assessment of a construction project schedule can be a challenging task for project stakeholders. A little research work has addressed quality of schedules though a good project schedule can be considered as of the key factors of project success. The development of a reliable and easy to perform construction schedule quality assessment procedure seems to be a challenging task. Since Schedule Health Assessment of a construction project has to be strictly related to process requirements, it is used the3 “S” rule as a starting point and framework for obtaining improved understanding of quality of construction schedules. The 3 “S” are Safety, Space and Structure, meaning that the planned process should provide a safe working environment to construction workers, sufficient space to perform construction activities and the required sequence of construction operations and project phases.The aim of the study is to implement a schedule quality assessment method that takes into account the 3“S” rule of construction process.The 3“S” requirements can be successfully integrated in a Schedule Health Assessment method, but to facilitate their implementation and control a flow-line chart is needed,thus the schedule tool becomes a new requirement for construction schedule quality control.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering, Research group: Digitalization in the real estate and construction sector, Research group: Capacity Development of Water and Environmental Services CADWES, Research group: Real estate development
Contributors: Bragadin, M. A., Kähkönen, K.
Number of pages: 8
Pages: 407-414
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
Keywords: Construction management, Project Control, Project Scheduling, Quality, Safety.
Source: RIS
Source ID: urn:F0EEB88647642A7A838E1B2E16C028A8

Research output: Contribution to journalArticleScientificpeer-review

A Cross-Cultural and Gender-Based Perspective for Online Security: Exploring Knowledge, Skills and Attitudes of Higher Education Students.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Pervasive Computing, Research area: Information security, University of Tampere, Department of Computer Science and Information Systems, University of Jyväskylä, Department of Computer Engineering and Information Technology of College of Information and Communication Technology at the University of Dar Es Salaam, Beijing Institute of Petrochemical Technology, University of Patras
Contributors: Chaudhary, S., Zhao, Y., Berki, E., Valtanen, J., Li, L., Helenius, M., Mystakidis, S.
Pages: 57-71
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: IADIS International Journal on WWW/Internet
Volume: 13
Issue number: 1
ISSN (Print): 1645-7641
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

Lean-tuotanto ja sen johtaminen: onnistuminen, haasteet ja soveltuminen Suomen yrityksiin ja muihin organisaatioihin

The so-called Lean development methods are today commonly used in many types of workplaces. Many good success stories are reported but Lean-projects and the tools used in them do not always bring the desired results. The central idea in Lean thinking is the distinction of two types of efficiencies; resource efficiency and flow efficiency. Lean production systems aim at high flow efficiency but achieving it requires high resource flexibility and understanding of the uncertainty inherent in the production system. Lean-management is often related to certain methods and techniques, but they do not alone bring improvement without a holistic managerial philosophy that supports improvement on several levels of the organization’s activities. Successful application of Lean management implies strategic choices and long-term commitment to organizational learning and development. The popularity of Lean management in Finnish organizations indicates that there is generally room for improvement in the organizations’ operational activities. Lean management provides a structured model for development. It can bring successful results if implemented holistically and with a long-term commitment.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Industrial Management, Research group: Center for Research on Operations Projects and Services
Contributors: Heikkilä, J., Martinsuo, M.
Number of pages: 7
Pages: 18-24
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Työpoliittinen aikakauskirja
Issue number: 3
ISSN (Print): 0787-510X
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Air pressure difference between indoor and outdoor or staircase in multi-family buildings with exhaust ventilation system in Finland

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Life Cycle Effectiveness of the Built Environment (LCE@BE), Research group: Concrete and Bridge Structures, Research area: Structural Engineering, Department of Civil Engineering, Research group: Building Physics, Natl Inst Hlth & Welf, Finland National Institute for Health & Welfare, Dept Environm Hlth
Contributors: Leivo, V., Kiviste, M., Aaltonen, A., Turunen, M., Haverinen-Shaughnessy, U.
Number of pages: 6
Pages: 1218-1223
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Energy Procedia
Volume: 78C
Article number: 78C
ISSN (Print): 1876-6102
Ratings: 
  • Scopus rating (2015): CiteScore 0.92 SJR 0.359 SNIP 0.562
Original language: English

Research output: Contribution to journalArticleScientificpeer-review

A Co-creation Centre for University–Industry Collaboration – A Framework for Concept Development

Abstract It is argued in general that future success in effective innovation creation is built on the ability to connect and manage talent, partnerships and related practical innovation processes. This makes it challenging for a university to develop an ecosystem of knowledge creation. The full benefit from a university can only be obtained if the university and society are organically linked together. The needs of society have to be at the centre of a university's activities, and flexible adjustment to changing needs is necessary but often lacking. Campus management has a major role in the facilitation of multidisciplinary interaction between students, scientists, entrepreneurs and other industry partners that inspire each other with different perspectives on the same subject. One significant tool to support open innovation with diverse stakeholders is to provide supportive spaces with relevant services. This paper aims to identify the requirements of a Co-creation Centre as a concept serving the third role of auniversity. The literature review was conducted and, based on the result, this paper proposes a conceptual framework for capturing the key requirements for developing a multiuser Co-creation Centre. The framework consists ofthe requirements on the demand and supply sides of campus management. The main findings in this paper are that different modes of knowledge conversion have different capabilities tosupport knowledge co-creation requirements. Knowledge co-creation process requirements in the multiuser Co-creation Centre for university–industry collaboration are best supported by originating “Ba”, which means the place where individuals share feelings, emotions, experiences, and mental models and the place where the knowledge-creation process begins. The results contribute to the concept development in campus management and provide a starting point for evaluating the success of multidisciplinary and multi-actor innovation environments.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering
Contributors: Huhtelin, M., Nenonen, S.
Pages: 137 - 145
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
Keywords: spaces and services.
Source: Bibtex
Source ID: urn:eaca1c4af451146bd5fea3acaaa20e86

Research output: Contribution to journalArticleScientificpeer-review

Resilient Asset Management and Governance Fordeteriorating Water Services Infrastructure

This paper argues that strategic asset management and a sound regulatory regime are required urgently if we want to change the current paradigm of aging and decaying water services infrastructure and expand the coverage of improved water services in the developing economies. In the OECD countries access to safe water supply and sanitation has largely been ensured through substantial investment over many decades. Yet, significant investments will still be required to rehabilitate the existing infrastructures, to bring them into conformity with more stringent environmental and health regulations, and to maintain service quality in the future. In the non-OECD countries the challenges are more daunting. Large parts of their population have no access and many suffer from unsatisfactory services. Nearly one billion people lack access to clean drinking water and 2.6 billion people lack access to improved sanitation services.Lack of sound economic regulatory frameworks and enforcement regimes, and poor asset management practices, in particular underpricing of water services is a common problem throughout the world.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering, Department of Chemistry and Bioengineering
Contributors: Hukka, J. J., Katko, T. S.
Number of pages: 8
Pages: 112-119
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
Keywords: aging and deteriorating water services infrastructure, investment gap, strategic asset management, regulatory and enforcement framework, sustainability.
Source: RIS
Source ID: urn:B63C341C3AC1323B613E64632E9D1135

Research output: Contribution to journalArticleScientificpeer-review

Social and Economic Importance of Water Services in the Built Environment: Need for More Structured Thinking

Abstract Community water supply takes priority over other water use purposes worldwide. Investment in water and sanitation systems in developing economies brings a multitudeof economic and social benefits. Water infrastructure systems across the world will deteriorateunless substantially more rehabilitation is done. This paper presents a structured and hierarchical framework for sustained water services development consisting of institutions, provision, water infrastructure and production of services that hopefully create better understanding of how to develop our systems and services as part of the built environment for more sustained futures.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering
Contributors: Katko, T. S., Hukka, J. J.
Number of pages: 7
Pages: 217-223
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Economics and Finance
Volume: 21
ISSN (Print): 2212-5671
Original language: English
Keywords: ageing water infrastructure, institutional development, priorities, production, provision, special features.
Source: RIS
Source ID: urn:E2D918716A9EA0A2093B36459CF62676

Research output: Contribution to journalArticleScientificpeer-review

Systematic Search and Ranking of Physical Contradictions Using Graph Theory Principles: Toward a Systematic Analysis of Design Strategies and their Impacts: TRIZ and Knowledge-Based Innovation in Science and Industry

Abstract This paper presents three interconnected developments made during the course of a recent collective research work, the development of a systematic graph-based search tool for physical contradictions, a ranking approach for defining the order of criticality of the design contradictions and the associated analysis of the different design strategies that can be used to solve those contradictions or to enhance performance indicators. The systematic graph-based search for physical contradictions is using the set of elementary variables necessary to describe the system as basic input. The initial set is extracted based on taxonomy of variables combining classification work from NIST and classification of variables derived from the Bond Graph theory. The contradiction search method is in a second step classifying the set of variables into three categories: the constraint variables imposed to the designers by the context and the environment, the design variables on which the designer as the possibility to act and the performance variables that are used to evaluate the performance of the designed system. In a third step, interactions between variables are searched using two possibilities: a causal ordering algorithm developed during the course of the research or via a collective work of experts. The result of this step is a directed graph starting from the constraints variables and ending with the performance variables. In the fourth step objectives have to be assigned to the performance variables (minimal value, maximal value or target value). Those objectives are propagated back into the graph by analyzing the impact of the variables interacting with the performance variables. A physical contradiction is detected each time it is discovered that a design variable is associated with two contradictory objectives. Following this approach, a contradiction is represented as a node in the directed graph. It is possible to systematically map the different design strategies that can be used and to rank the possible impact of those design strategies. The article presents a concrete application of the approach on the case study of an air bearing and demonstrates the novelty of the approach to generate new viewpoints and insight in the analysis of the early stages of the development process. The potential impact of such type of design support is potentially very important. A future step will consists of developing a computer aided tool implementing the method.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Mechanical Engineering and Industrial Systems, Aalto University, Aalto Univ, Aalto University, Aalto Univ Finland, Dept Engn Design & Prod, Sch Engn
Contributors: Coatanéa, E., Ryynänen, L., Calonius, O., Mokammel, F., Riitahuhta, A.
Number of pages: 18
Pages: 1165-1182
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Procedia Engineering
Volume: 131
ISSN (Print): 1877-7058
Ratings: 
  • Scopus rating (2015): CiteScore 0.56 SJR 0.239 SNIP 0.566
Original language: English
Keywords: graph theory, TRIZ, physical contradiction, innovative principles, air bearing

Bibliographical note

EXT="Coatanéa, Eric"
EXT="Riitahuhta, Asko"

Source: RIS
Source ID: urn:4AB62BAC3A0A0D77B9BD9FDFF1D977D4

Research output: Contribution to journalArticleScientificpeer-review

Kohti tasapuolisempaa tutkimuksen arviointia: Pääkirjoitus

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Civil Engineering
Contributors: Katko, T. S.
Number of pages: 2
Pages: 4-5
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Ympäristöhistoria: Finnish Journal of Environmental History
Volume: 5
Issue number: 1
ISSN (Print): 1799-6953
Original language: Finnish

Research output: Contribution to journalArticleScientificpeer-review

Importance and challenges of sharing experiences among an international and interdisciplinary group of doctoral students

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Chemistry and Bioengineering, Research group: Industrial Bioengineering and Applied Organic Chemistry
Contributors: Kurki, V., Sidaraviciute, R., Sörensen, J., Kibocha, S. N., Retike, I., Ikobe, G., Tichonovas, M., Elijosiute, E., Rajala, R.
Number of pages: 7
Pages: 45-51
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Ympäristöhistoria: Finnish Journal of Environmental History
Issue number: 1/2015
ISSN (Print): 1799-6953
Original language: English

Bibliographical note

EXT="Kibocha, Samuel Ngari"
EXT="Rajala, Riikka"

Research output: Contribution to journalArticleScientificpeer-review

Development of chip-surface stimulus electrode array for fully-implantable subretinal prosthesis chip

In this study, we have developed a chip-surface stimulus electrode array for fully-implantable subretinal prosthesis chip. To realize visual restoration with high resolution, stimulus electrodes should be miniaturized and arrayed with high density. When we miniaturize them, however, their electrochemical impedances become higher and their amount of charge injection become smaller. Additionally, as the number of electrodes increases, it becomes difficult to make electrical connection to each pixel of the retinal prosthesis chip and each electrode by electrical wiring. To overcome these problems, we have developed the stimulus electrodes that have low electrochemical impedances and large charge injection capacities, and established a fabrication process of chip-surface stimulus electrode array. We fabricated the stimulus electrodes made of extremely porous platinum which had large-surface-area compared with conventional Pt. We also fabricated the chip-surface stimulus electrodes array on the subretinal prosthesis chip which surface was rough and covered with insulator film.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Biomaterials and Tissue Engineering Group, BioMediTech, Integrated Technologies for Tissue Engineering Research (ITTE), International Graduate School in Biomedical Engineering and Medical Physics (Ministry of Education in Finland), Graduate School of Engineering, Tohoku University
Contributors: Sasaki, Y., Suzuki, T., Iwagami, T., Tani, T., Naganuma, H., Kino, H., Hyttinen, J., Kellomäki, M., Tanaka, T.
Pages: O-253-O-254
Publication date: 17 Aug 2014
Peer-reviewed: Yes

Publication information

Journal: Transactions of Japanese Society for Medical and Biological Engineering
Volume: 52
ISSN (Print): 1347-443X
Ratings: 
  • Scopus rating (2014): CiteScore 0.01 SJR 0.127 SNIP 0.038
Original language: English
ASJC Scopus subject areas: Biomedical Engineering
Keywords: Electrode, Extremely porous platinum, Retinal prosthesis
Source: Scopus
Source ID: 84939439184

Research output: Contribution to journalArticleScientificpeer-review

Development of Si neural probe module with adjustable gain amplifier for neuronal signal recording

In recent years, lots of research on biomedical technologies directly using bio-signals such as BMI (Brain Machine Interface) have been performed intensively. Among bio-signals, ECoG (Electrocorticogram), LFP (Local Field Potential), and AP (Action Potential) are usually recorded especially for diagnosis, treatment, and prevention of brain diseases. These bio-signals have different amplitudes and frequency bandwidths, and the signal intensities vary accordingly with recording electrode conditions and individual variation. Therefore, a multiple bio-signals recording system having adjustable gain and bandwidth is strongly required. In this study, we designed the adjustable gain amplifier appropriate for the system, and fabricated the module composed of the amplifier and a Si neural probe for the multiple bio-signal recording in the deep brain. Additionally, we verified fundamental functions of the module by in vitro experiments.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Electronics and Communications Engineering, Research group: Biomaterials and Tissue Engineering Group, Research group: Computational Biophysics and Imaging Group, BioMediTech, Integrated Technologies for Tissue Engineering Research (ITTE), Graduate School of Engineering, Electrical and Electronics Engineering Department, Department of Bioengineering and Robotics, Tohoku University, Nagasaki Institute of Applied Science
Contributors: Tani, T., Naganuma, H., Harashima, T., Iwagami, T., Kino, H., Kiyoyama, K., Kellomäki, M., Hyttinen, J., Tanaka, T.
Pages: O-377-O-378
Publication date: 17 Aug 2014
Peer-reviewed: Yes

Publication information

Journal: Transactions of Japanese Society for Medical and Biological Engineering
Volume: 52
ISSN (Print): 1347-443X
Ratings: 
  • Scopus rating (2014): CiteScore 0.01 SJR 0.127 SNIP 0.038
Original language: English
ASJC Scopus subject areas: Biomedical Engineering
Keywords: Adjustable gain amplifier, Multiple bio-signal recording, Si neural probe
Source: Scopus
Source ID: 84939449061

Research output: Contribution to journalArticleScientificpeer-review

Knowledge Management Practices in Large Companies

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Department of Information Management and Logistics, Research group: Novi, University of Vaasa
Contributors: Väyrynen, H., Helander, N., Kukko, M.
Number of pages: 17
Pages: 56-72
Publication date: 2014
Peer-reviewed: Yes
Early online date: 2014

Publication information

Journal: The Macrotheme Review
Volume: 3
Issue number: 9
Article number: 3(9)
ISSN (Print): 1848-4735
Original language: English
Keywords: Knowledge Management, practices, survey, large companies

Bibliographical note

Versio ok 20.4.2016 /KK
EXT="Helander, Nina"

Research output: Contribution to journalArticleScientificpeer-review

Design: A Key Stage of Product Lifecycle

DESIGN\nappears to be a key and critical stage of product lifecycle. Different models have been introduced in previous research to describe the conceptual design process. The RFBS model is one of them extending and deepening the existing FBS models. A previous paper was presenting the model and assuming the possible execution of the process tasks automatically. The present paper provides an overview of the progresses that have been made in this direction during the past years. The model-driven engineering philosophy underlying the RFBS model of knowledge is concretely exemplified in this paper. The implementation through ontology and language such as SysML that was part of the model-driven engineering philosophy is concretely described in this paper in form of computer-aided tools dedicated to the conceptual design stages.

General information

Publication status: Published
MoE publication type: A1 Journal article-refereed
Organisations: Intelligent dexterity for secure networked infrastructure and applications (IDSNIA), Aalto Univ, Aalto University, Aalto Univ Finland, Dept Engn Design & Prod, Sch Engn
Contributors: Bernard, A., Coatanea, E., Christophe, F., Laroche, F.
Number of pages: 7
Pages: 3-9
Publication date: 2014
Peer-reviewed: Yes

Publication information

Journal: Procedia CIRP
Volume: 21
ISSN (Print): 2212-8271
Ratings: 
  • Scopus rating (2014): SJR 0.755 SNIP 1.4
Original language: English
Source: Mendeley
Source ID: c917d102-f71c-324d-bf73-70ffe40d606b

Research output: Contribution to journalArticleScientificpeer-review

Printed and organic diodes: devices, circuits and applications

We review the history and current state of the art of diodes fabricated with organic semiconductors and other printable materials. In particular, we look at the integration of printed diodes into circuits and systems for applications, with particular emphasis on rectification, energy harvesting, and negative differential resistance (e.g. tunnel diodes). An overview of solution processed and printable organic and inorganic materials utilised in diodes is provided with an in depth analysis of their physics of operation. Furthermore, it is explained how the diverse array in which printed diodes can be implemented demonstrates their potential in the printed electronics industry.

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Electronics and Communications Engineering, Research group: Laboratory for Future Electronics, Research group: Wireless Communications and Positioning
Contributors: Kraft, T., Berger, P., Lupo, D.
Number of pages: 19
Publication date: 29 Sep 2017
Peer-reviewed: Yes

Publication information

Journal: Flexible and Printed Electronics
Volume: 2
Issue number: 3
Article number: 033001
ISSN (Print): 2058-8585
Ratings: 
  • Scopus rating (2017): CiteScore 2.68 SJR 0.779 SNIP 1.163
Original language: English
Keywords: printed diodes, Printed electronics, Organic electronics, Energy Harvesting, rectification, tunnel diodes

Research output: Contribution to journalReview ArticleScientificpeer-review

Vesi, ongelma ennen ja nyt?

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Civil Engineering
Contributors: Juuti, P.
Pages: 54-65
Publication date: May 2017
Peer-reviewed: Yes

Publication information

Journal: Ympäristöhistoria: Finnish Journal of Environmental History
Volume: 2017
Issue number: 1
ISSN (Print): 1799-6953
Original language: Finnish

Research output: Contribution to journalReview ArticleScientificpeer-review

Local narratives in the long term water conflicts: Case of Turku Region in Finland

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Civil Engineering
Contributors: Juuti, P. S., Kurki, V., Rajala, R.
Pages: 39-49
Publication date: May 2017
Peer-reviewed: Yes

Publication information

Journal: Ympäristöhistoria: Finnish Journal of Environmental History
Volume: 2017
Issue number: 1
ISSN (Print): 1799-6953
Original language: English

Research output: Contribution to journalReview ArticleScientificpeer-review

Sata vuotta Suomen suurimmasta lavantautiepidemiasta

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Civil Engineering
Contributors: Juuti, P., Rajala, R.
Number of pages: 3
Pages: 12-14
Publication date: 2017
Peer-reviewed: Yes

Publication information

Journal: Vesitalous
Volume: 2017
Issue number: 1
ISSN (Print): 0505-3838
Original language: Finnish

Research output: Contribution to journalReview ArticleScientificpeer-review

Valkea kaupunki, mustat vedet

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Civil Engineering
Contributors: Juuti, P., Rajala, R.
Number of pages: 3
Pages: 15-17
Publication date: 2017
Peer-reviewed: Yes

Publication information

Journal: Vesitalous
Volume: 2017
Issue number: 1
ISSN (Print): 0505-3838
Original language: English

Research output: Contribution to journalReview ArticleScientificpeer-review

A review study of photovoltoltaic array maximum power point tracking algorithms

There are numerous maximum power point tracking (MPPT) algorithms for improving the energy efficiency of solar photovoltaic (PV) systems. The main differences between these algorithms are digital or analog implementation, simplicity of the design, sensor requirements, convergence speed, range of effectiveness, as well as hardware costs. Therefore, choosing the right algorithm is very important to the users, because it affects the electrical efficiency of PV system and reduces the costs by decreasing the number of solar panels needed to get the desired power. This paper provides the comparison of 62 different techniques used in tracking the maximum power based on literature survey. This paper is intended to be a reference for PV systems users.

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Department of Electrical Engineering, Research area: Power engineering, Islamic University of Gaza
Contributors: El-Khozondar, H., El-Khozondar, R., Matter, K., Suntio, T.
Number of pages: 8
Publication date: 18 Feb 2016
Peer-reviewed: Yes

Publication information

Journal: Renewables: Wind, Water, and Solar
Volume: 3
Issue number: 1
ISSN (Print): 2198-994X
Original language: English

Research output: Contribution to journalReview ArticleScientificpeer-review

Future in wood? Timber construction in boosting local development.

Large scale timber construction has been on the upswing for some time in many European countries. Besides the building cluster, also regions and cities have taken advantage of the ongoing timber boom in their economic and spatial development. In this article the focus is on the South Ostrobothnia region and the city of Seinäjoki in Western Finland, where the potential of the business is quite weakly exploited regardless of favourable preconditions. By studying the key actors of the innovation network we are able to better understand the premises of the local development platform that should aim at boosting timber construction.

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: School of Architecture, Research group: Urban Laboratory
Contributors: Hynynen, A.
Number of pages: 13
Pages: 127-139
Publication date: 2016
Peer-reviewed: Yes

Publication information

Journal: European Spatial Research and Policy
Volume: 23
Issue number: 1
ISSN (Print): 1231-1952
Ratings: 
  • Scopus rating (2016): CiteScore 0.28 SJR 0.152 SNIP 0.378
Original language: English
Keywords: Urban development, regional development, timber construction, innovation network, development platform

Research output: Contribution to journalReview ArticleScientificpeer-review

Обзор параметрических методов позиционирования на основе концепции отпечатка пальца

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Department of Automation Science and Engineering, Research area: Dynamic Systems, Department of Mathematics, Research group: MAT Positioning, Research group: Positioning
Contributors: Müller, P., Raitoharju, M., Ali-Löytty, S., Wirola, L., Piche, R.
Pages: 3-35
Publication date: 2016
Peer-reviewed: Yes

Publication information

Journal: Giroskopiya I Navigatsiya
Volume: 24
Issue number: 1
ISSN (Print): 0869-7035
Original language: Russian

Bibliographical note

Translation of "A Survey of Parametric Fingerprint-Positioning Methods", Gyroscopy and Navigation, vol 7, issue 2, 2016, pp. 107-127.

Research output: Contribution to journalReview ArticleScientificpeer-review

Interdisciplinary water research network building within Nordic and Baltic countries.

General information

Publication status: Published
MoE publication type: A2 Review article in a scientific journal
Organisations: Department of Chemistry and Bioengineering, Research group: Industrial Bioengineering and Applied Organic Chemistry, Department of Civil Engineering
Contributors: Sörensen, J., Kurki, V., Sidaraviciute, R., Ngari Kibocha, S., Retike, I., Ikobe, G., Tichonovas, M., Elijosiute, E., Rajala, R.
Number of pages: 5
Pages: 79-83
Publication date: 2015
Peer-reviewed: Yes

Publication information

Journal: Vatten
Issue number: 71
ISSN (Print): 0042-2886
Original language: English

Research output: Contribution to journalReview ArticleScientificpeer-review

Nanocellulose as a Piezoelectric Material

Cellulose-based nanomaterials, which are generally known as nanocelluloses, are interesting renewable biomaterials which have potential applications for example in material science, electronics and biomedical engineering and diagnostics. Cellulose has a strong ability to form lightweight, highly porous and entangled networks that make nanocellulose suitable as substrate or membrane material. Recently, also studies related to piezoelectric behavior of nanocellulose have been published. The piezoelectricity of wood was proposed already in 1955 by Eiichi Fukada, but only very slightly studied since then. Here, we show the experimental evidence of significant piezoelectric activity of different types of nanocellulose films. Wood-based cellulose nanofibril (CNF) and cellulose nanocrystals (CNC) films, and bacterial nanocellulose (BC) films have been studied. The recent results suggest that nanocellulose is a potential bio-based piezoelectric sensor material.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Faculty of Biomedical Sciences and Engineering, Nokia Technologies
Contributors: Tuukkanen, S., Rajala, S.
Number of pages: 14
Pages: 1-14
Publication date: 29 Aug 2018

Host publication information

Title of host publication: Piezoelectricity - Organic and Inorganic Materials and Applications
Publisher: InTech Open Access Publisher
ISBN (Electronic): 978-953-51-6209-4

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

Technical suitability of the fine fraction of municipal solid waste incineration bottom ash to the landfill capping liner

To protect the natural aggregates and promote the circular economy the suitable secondary aggregates have been studied intensively in last decades in Finland. One promising secondary aggregate is bottom ash from the municipal solid waste incineration (MSWI) process.
The municipal incinerator bottom ash (MIBA, also called MSWI BA) contains heavy metals and other contaminants limiting its environmental acceptability. The fines contain typically the highest concentrations of contaminants. The portion of inert particles such as rock, glass and mineral waste is higher in coarser fractions.
The aim of the study was to assess the suitability of the fines of MIBA to the mineral liner in landfill capping. Based on the environmental permit, the target permeability value for capping liner is k ≤ 1 · 10-9 m/s. The permeability of the fines of MIBA is typically around 1 · 10-7 m/s when well compacted. In order to achieve the required permeability, bentonite or other additivies are needed. The grains are porous and the pH is high, typically 10-12, which effect on the amount of bentonite required. In addition, the MIBA contain high concentrations of diluting chlorides, sulfides and calcium, which decrease the swelling properties of the bentonite. The swelling capacity of bentonite decreases when permeating aggressive leakages with high cation concentration. Therefore a special polymer treated bentonite were chosen for the tests. The addition of superabsorbent polymers, which have much higher resistance to aggressive leakages, greatly improve the performance and self-healing capacity of bentonite.
First, laboratory tests were performed to estimate the proper amount and quality of the bentonite needed to achieve the permeability required. Two bentonite types were tested, the common natural bentonite and a special polymer modified bentonite produced by Cetco. The swelling index of both types of bentonite were tested by a eluate of MIBA. Several permeability tests were performed to evaluate the effect of dry density, bentonite quality and dose, and portion of coarser grains (2-5 mm).
After laboratory testing, a test area was constructed on an old waste fill to the Ämmässuo. During the construction, it was noticed that the water content effects significantly on the compaction result. The mineral liner was covered by a 1,5 mm thick LLDPE geomembrane and protective geotextile. The liner structure is covered only by a 0,5 m thick drainage layer from crushed rock. No surface layer were constructed.
After one year, the liner was exposed and studied. The quality of the structures, especially the mineral liner were visually evaluated and gas emissions were measured from the surface. The density of the layer was measured by volymeter and troxler and the water content and permeability were measured in laboratory. Based on the visual inspection the surface of the mineral liner was smooth, and the layer homogenious and hardened

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Civil Engineering, Research group: Earth Constructions
Contributors: Leppänen, M., Sarkkila, J., Hämäläinen, H., Rinkinen, J.
Pages: 168-175
Publication date: 6 Jun 2018

Host publication information

Title of host publication: Proceedings of the 10th International Conference on the Environmental and Technical Implications of Construction with Alternative Materials WASCON 2018 : No Gradle, No Grave - Circular Economy into Practice
Publisher: RIL - Finnish Association of Civil Engineers
Editors: Raasakka, V., Lahtinen, P.
ISBN (Electronic): 978-951-758-631-3
Keywords: municipal solid waste bottom slag, Landfill cover, bentonite, chemical incompability

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

Quality evaluation on of contractor’s schedule for building renovation

In building and construction projects, the phase schedule developed by the contractor for the bidding phase, or after the contract award, has to be evaluated by owner’s consultant for schedule approval. After approval, the phase schedule becomes the baseline for project control process and therefore it becomes very important to both owner and contractor to ensure that contract obligations will be respected. The baseline schedule developed by the contractor is frequently used by project supervisors or construction managers to justify (or deny) a request of time extensions, or to evaluate process efficiency and the possibility of late completion, and therefore can have major consequences in project cost management.
In the owner’s perspective, three are the main requirements to be fulfilled in a baseline schedule. Firstly, the construction total duration, i.e. contract time requirements about milestones and project completion. Secondly, baseline schedule entails the promised average process production rate that should fulfill contract requirements for progress payments. Thirdly, the construction safety coordination requirement, i.e. the compliance of the schedule with the safety – oriented project schedule developed by the safety coordinator (under the health and safety EU directive). In addition to this, the review of the phase schedule should give evidence of the quality of the schedule itself, i.e. give proof of its validness.
In the research behind this paper, a Schedule Health Assessment procedure has been proposed for the evaluation of the schedule quality, and it is suggested to adopt the Schedule Health Assessment approach for the contractor’s schedule review and approval. A case study of a renovation building project has been analyzed to test the proposed procedure and the possibility of using it for contractor’s schedule approval in design-bid-build or design – build projects.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Civil Engineering, Research area: Construction Management and Economics, Research group: Digitalization in the real estate and construction sector, Research group: Capacity Development of Water and Environmental Services CADWES, Research group: Real estate development
Contributors: Kähkönen, K., Brandt, J.
Number of pages: 10
Pages: 175-184
Publication date: 1 Aug 2017

Host publication information

Title of host publication: Re‐shaping the construction industry
Publisher: ISTeA Italian Society of Science, Technology and Engineering of Architecture; Maggioli Editore
Editors: Ciribini , A., Alaimo , G., Capone , P., Daniotti , B., Dell’Osso , G., Nicolella , M.
ISBN (Electronic): 978-88-916-2486-4

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

Tools, pedagogical models, and best practices for digital storytelling

Sharing photos and short videos with others has become increasingly popular among youth. Although sharing videos is a common activity among youth, schools are not using digital videos for learning. There is a need to study the pedagogical models that could be used in designing classroom activities involving the use of digital videos. In this chapter, digital video storytelling will be discussed in the context of learning. In this chapter, pedagogical models, examples, best practices, and outcomes that illustrate how students become engaged and motivated when using digital storytelling in knowledge creation in cross-cultural settings will be presented. The pedagogical models discussed in this chapter are Global Sharing Pedagogy (GSP) and Video Inquiry Learning (VIL). A review of existing tools and practices for digital video storytelling will be presented. The results show that students can become highly engaged in learning through digital storytelling.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Research group: TUT Game Lab, Pervasive Computing, University of Helsinki
Contributors: Multisilta, J., Niemi, H.
Publication date: Jul 2017

Host publication information

Title of host publication: Encyclopedia of information science and technology
Publisher: IGI Global
Editor: Khosrow-Pour, M.
Edition: 4th
ISBN (Electronic): 9781591405535

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

The use of mathematical modeling for the development of a low cost fuzzy gain schedule neutralization control system

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Automation and Hydraulic Engineering, Faculty of Biomedical Sciences and Engineering, Federal Institute of São Paulo, Universidade Estadual de Campinas, Federal University of Uberlândia
Contributors: Sislian, R., da Silva, F. V., Gedraite, R., Jokinen, H., Rajan, D. K.
Number of pages: 15
Pages: 525-539
Publication date: 4 Feb 2017

Host publication information

Title of host publication: Transactions on Engineering Technologies : World Congress on Engineering and Computer Science 2015
Publisher: Springer Singapore
ISBN (Print): 9789811027161
ISBN (Electronic): 9789811027178
ASJC Scopus subject areas: Medicine(all), Biochemistry, Genetics and Molecular Biology(all), Immunology and Microbiology(all)
Source: Scopus
Source ID: 85055224030

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

Reinventing organisational creativity and innovation through adapting a service-based working culture

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Information Management and Logistics
Contributors: Ketonen-Oksi, S.
Number of pages: 20
Pages: 1-20
Publication date: 2017

Host publication information

Title of host publication: Integrating arts and creativity into business practice
Publisher: IGI Global
Editors: Schiuma, G., Lerro, A.
ISBN (Electronic): 978-1-5225-2050-4

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

Glass and Glass-Ceramic Scaffolds: Manufacturing Methods and the Impact of Crystallization on In-Vitro Dissolution

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Biomaterials and Tissue Engineering Group
Contributors: Nommeots-Nomm, A., Massera, J.
Number of pages: 19
Publication date: 2017

Host publication information

Title of host publication: Scaffolds in Tissue Engineering - Materials, Technologies and Clinical Applications
Publisher: InTech Open Access Publisher
ISBN (Electronic): 978-953-51-3642-2

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

Effects of Social Media on Consumers' Sports Brand Experiences and Loyalty

Brand experience has been noted as a key attribute affecting buying behavior. Although research into the determinants of brand loyalty in sport context has grown in recent years, the focus has predominantly been on brand experience, brand personality and satisfaction, not on social media variables. In addition, we lack empirically verified evidence of the brand experience and brand loyalty relationship mediated through brand identification. In this research the authors address the role of four different social media platforms and how they drive brand loyalty through different types of brand experiences, brand identification and satisfaction to the brand experience. Structural equation modelling is used to test the model based on data from a survey of 815 ice hockey fans of a particular ice hockey team. The results show that brand experience is positively affected by brand engagement in social media and the relationship is strengthened when more different social media platforms are used for following the brand. Brand experience affects brand loyalty mainly indirectly through brand identification and satisfaction constructs.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Industrial and Information Management
Contributors: Munnukka, J., Karjaluoto, H., Mahlamäki, T., Hokkanen, V.
Number of pages: 14
Pages: 1051-1064
Publication date: 2017

Host publication information

Title of host publication: Creating Marketing Magic and Innovative Future Marketing Trends : Proceedings of the 2016 Academy of Marketing Science (AMS) Annual Conference
Publisher: Springer International Publishing
Editor: Stieler, M.
ISBN (Print): 978-3-319-45596-9

Publication series

Name:  Developments in Marketing Science: Proceedings of the Academy of Marketing Science
ISSN (Print): 2363-6165

Bibliographical note

jufoid=85075

Source: Bibtex
Source ID: urn:531c45abc12e7076a1ecfdb73d8ebcbb

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

Re-inventing organizational creativity and innovation through adopting a service-based working culture

By considering creativity to be a necessity for organisational competitiveness in today's rigorously changing working environments, this study seeks to examine whether adopting a service-based working culture could significantly improve organisational creativity and innovation. Grounded on the concepts of the Service-Dominant Logic and Complex Adaptive Systems, this research develops on understanding of the complexity of the emerging socially and digitally connected networks of individuals, teams and institutions. By introducing a novel framework for facilitating and improving the adaptability of a service-based working culture, this study offers both deliberation and practical advice for business organisations seeking valuable insight into how to develop and manage organisational creativity and innovation in increasingly digitalised service ecosystems. Specifically, the proposed framework encourages organisations to invest in the learning capacities and motivations of their employees.;

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Industrial and Information Management
Contributors: Ketonen-Oksi, S.
Number of pages: 20
Pages: 1-20
Publication date: 28 Dec 2016

Host publication information

Title of host publication: Integrating Art and Creativity into Business Practice
Publisher: IGI Global
ISBN (Print): 9781522520504
ISBN (Electronic): 9781522520511
ASJC Scopus subject areas: Arts and Humanities(all), Economics, Econometrics and Finance(all), Business, Management and Accounting(all)
Source: Scopus
Source ID: 85016922803

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

icellfusion: Tool for fusion and analysis of live-cell images from time-lapse multimodal microscopy

Temporal, multimodal microscopy imaging of live cells is becoming widely used in studies of cellular processes. In general, temporal sequences of images with functional and morphological data from live cells are acquired using multiple image sensors. The images from the different sources usually differ in resolution and have non-coincident fields of view, making the merging process complex. We present a new tool - iCellFusion - that performs data fusion of images from Phase-Contrast Microscopy and Fluorescence Microscopy in order to correlate the information on cell morphology, lineage and functionality. Prior to image fusion, iCellFusion performs automatic or computer-aided cell segmentation and establishes cell lineages. We exemplify its usage on time-lapse, multimodal microscopy images of bacteria producing fluorescent spots. We expect iCellFusion to assist research in Cell and Molecular Biology and the healthcare sector, where live-cell imaging is an increasingly important technique to detect and study diseases at the cellular level.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Signal Processing, Research group: Laboratory of Biosystem Dynamics-LBD, Instituto de Desenvolvimento de Novas Tecnologias
Contributors: Santinha, J., Gupta, A., Martins, L., Annila, T., Häkkinen, A., Mora, A., Lloyd-Price, J., Ribeiro, A., Oliveira, S. M. D., Fonseca, J. R.
Number of pages: 29
Pages: 806-834
Publication date: 30 Aug 2016

Host publication information

Title of host publication: Biometrics: Concepts, Methodologies, Tools, and Applications
Publisher: IGI Global
ISBN (Print): 9781522509837
ISBN (Electronic): 9781522509844
ASJC Scopus subject areas: Computer Science(all)
Source: Scopus
Source ID: 85015879219

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

Learning Maths with mobiles: Cross-cultural design of technology with experiences in South-Africa and Finland

This chapter presents an overview of our experiences on cross-cultural design of technology in the context of mobile learning focusing on supporting learners to study mathematics in two different countries. The aim of our study is to discuss design issues from the perspective of two different types of cultures and reflect culturally sensitive issues based on a longitudinal study, which included empirical data from altogether over 3500 learners of grades 9 and 10. As a result we outline two focus areas: content and concept for best design practices. Furthermore, we argue that cross-cultural design of technology can help to identify culturally sensitive areas such as attitudes towards informal and collaborative learning and recognizing the local context for the content. Cross-cultural design of technology supports development of good user experience of mobile learning services for different local learning contexts.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Pervasive Computing
Contributors: Vainio, T., Walsh, T.
Number of pages: 19
Pages: 741-759
Publication date: 18 Aug 2016

Host publication information

Title of host publication: Blended Learning: Concepts, Methodologies, Tools, and Applications
Volume: 4
Publisher: IGI Global
ISBN (Print): 9781522507833
ISBN (Electronic): 9781522507840
ASJC Scopus subject areas: Social Sciences(all), Computer Science(all)

Bibliographical note

EXT="Vainio, Teija"

Source: Scopus
Source ID: 85016852656

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

Framework for optimization and scheduling of a copper production plant

This work presents a nonlinear optimization and scheduling approach applied to a copper production plant. The solution maximizes smelting furnace production and provides valid converting schedules by simulating the evolution of the process over the optimization horizon. The production process is briefly described and the main models used to predict and calculate furnace and converter parameters are detailed. Though the solution is concentrated on the main elements, copper and iron, the optimization framework enables easy future augmentation with more complex models. A schedule optimization case is presented.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Automation Science and Engineering, Research area: Dynamic Systems, Research area: Measurement Technology and Process Control
Contributors: Suominen, O., Mörsky, V., Ritala, R., Vilkko, M.
Number of pages: 6
Pages: 1243-1248
Publication date: 25 Jun 2016

Host publication information

Title of host publication: 26th European Symposium on Computer Aided Process Engineering, 2016
Volume: 38
Publisher: Elsevier Science B.V.
ISBN (Print): 9780444634283

Publication series

Name: Computer Aided Chemical Engineering
ISSN (Print): 1570-7946
ASJC Scopus subject areas: Chemical Engineering(all), Computer Science Applications
Keywords: copper smelting, modelling, nonlinear optimization, Scheduling

Bibliographical note

JUFOID=70254

Source: Scopus
Source ID: 84994385954

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

Crowdsourcing in Business-to-Business Markets: A Value Creation and Business Model Perspective

The foundation for the analysis of this chapter builds on the value creation model of Amit and Zott (2001), where they studied the importance of sources of value creation in the field of electronic business. This model was chosen for the purposes of this study because it is developed from fundamental value creation models and dominates concerning value creation in e-business, of which crowdsourcing by utilizing social media tools represents also. Moreover, Amit and Zott’s business model (2001, p. 511), which focuses on e-business for B2C companies, can be adapted for all virtual markets in general, and also applies to B2B companies (2006, p. 20). Most importantly, the model enables to analyze the relations between value creation and business model. In next, the theoretical background of value creation is opened up especially in the context of business-to-business markets, and furthermore, the model of Amit and Zott (2001) is presented. Lastly, crowdsourcing in business-to-business markets as the research context of the present study is discussed.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Information Management and Logistics, Research group: Novi, Managing digital industrial transformation (mDIT)
Contributors: Bernhardt, J., Helander, N., Jussila, J., Kärkkäinen, H.
Number of pages: 11
Pages: 933-943
Publication date: Apr 2016

Host publication information

Title of host publication: Encyclopedia of E-Commerce Development, Implementation, and Management
Place of publication: United States
Publisher: IGI Global
Article number: 66
ISBN (Print): 978-1-4666-9787-4

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

On Polyglot Programming in the Web

Different programming languages have been designed to solve problems efficiently in different domains. The goal of polyglot programming, a technique where several languages are used in the creation of a single application, is to combine and utilize the best solutions from different programming languages and paradigms in a seamless fashion. In this paper, the authors examine polyglot programming in the context of web applications, where it has been commonly used to create compelling applications, but where there is still considerable potential to improve development in various ways.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Pervasive Computing, Research area: Software engineering, Ada Drive
Contributors: Harmanen, J., Mikkonen, T.
Number of pages: 18
Pages: 102-119
Publication date: 2016

Host publication information

Title of host publication: Modern Software Engineering Methodologies for Mobile and Cloud Environments
Publisher: IGI Global
ISBN (Print): 9781466699168
ISBN (Electronic): 9781466699175

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

Two models for hydraulic cylinders in flexible multibody simulations

In modelling hydraulic cylinders interaction between the structural response and the hydraulic system needs to be taken into account. In this chapter two approaches for modelling flexible multibody systems coupled with hydraulic actuators i.e. cylinders are presented and compared. These models are the truss-elementlike cylinder and bending flexible cylinder models. The bending flexible cylinder element is a super-element combining the geometrically exact Reissner-beam element, the C1-continuous slide-spring element needed for the telescopc movement and the hydraulic fluid field. Both models are embeded with a friction model based on a bristle approach. The models are implemented in a finite element enviroment. In time the coupled stiff differential equation system is integrated using the L-stable Rosenbrock method.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Civil Engineering, Research group: Structural Mechanics, Department of Mechanical Engineering and Industrial Systems, Research area: Applied Mechanics, FS Dynamics Finland Oy Ab
Contributors: Ylinen, A., Mäkinen, J., Kouhia, R.
Number of pages: 31
Pages: 463-493
Publication date: 2016

Host publication information

Title of host publication: Computational Methods for Solids and Fluids : Multiscale Analysis, Probability Aspects and Model Reduction
Publisher: Springer
ISBN (Print): 978-3-319-27994-7
ISBN (Electronic): 978-3-319-27996-1

Publication series

Name: Computational Methods in Applied Sciences
Volume: 41
ISSN (Print): 1871-3033
ASJC Scopus subject areas: Computational Mathematics, Modelling and Simulation, Fluid Flow and Transfer Processes, Computer Science Applications, Civil and Structural Engineering, Electrical and Electronic Engineering, Biomedical Engineering

Bibliographical note

JUFOID=79940
EXT="Ylinen, Antti"

Source: Scopus
Source ID: 84964233721

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

Probabilistic Framework for Modelling the Evolution of Geomorphic Features in 10,000-Year Time Scale: The Eurajoki River Case

In this paper the long-term evolution of the catchment area of Eurajoki River, situated in Western Finland, is studied. The modelling area, nearly 1000 km2 in size, is at present mostly covered by sea. Probabilistic digital elevation model and land uplift model form the basis for the future catchment area modelling. A land uplift model is required due to the ongoing post-glacial rebound especially in the western parts of Finland. The maximum rate of land uplift in Finland is 1 cm per year while in the modelling area the land uplift rate is about 6 mm per year. The digital elevation model and land uplift model have been calculated using Monte Carlo simulation where the uncertainties in the source data have been taken into account. The probabilistic nature of these models enables also the river catchment area and river network analyses probabilistically. The analyses are done for the next 10,000 years in 1000-year intervals and 100 realizations are estimated for each time point. The results show that the catchment area expands towards the west as the land rises. An alternative river branch flowing northwards from the main course will form with a significant probability. Also, a delta area with multiple river branches is expected to form at about 7000 years after present.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Pori Department, Research group: Data-analytics and Optimization
Contributors: Pohjola, J., Turunen, J., Lipping, T., Ikonen, A. T.
Pages: 369-382
Publication date: 2016

Host publication information

Title of host publication: Geospatial Data in a Changing World : Selected papers of the 19th AGILE Conference on Geographic Information Science
Publisher: Springer Verlag
ISBN (Print): 978-3-319-33782-1
ISBN (Electronic): 978-3-319-33783-8

Publication series

Name: Lecture Notes in Geoinformation and Cartography
ISSN (Print): 1863-2246

Bibliographical note

JUFOID=82325

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

Functional model for organisational and safety culture

Cultures are usually defined as shared values, attitudes and behaviour of certain group. The core of culture is inside person's mind. Only through behaviour or other actions of persons the culture becomes visible and shareable. Cultural artefacts and all other perceptible signs of culture are formed through action. From this perspective culture requires functionality. It does not exist nor spread without activity of individuals. In systems theory there is a methodological distinction between theoretical system and empirical system. Theoretical system "is a complex of concepts, suppositions, and propositions having both logical integration and empirical reference". Empirical system is "a set of phenomena in the observable world that is amenable to description and analysis by means of a theoretical system". However, in cultural context, theoretical models usually describe only properties of the empirical system. Usually the functionality of the culture is left undefined. Therefore theoretical models may have flaws in their ability to describe the functionality of the culture, which is essential part of the culture. In this paper we use a novel functional model to explore the functionality of the most commonly used culture models. We inspect Schein's organizational culture model, Cooper's reciprocal safety culture model and Johnson's cultural web. We study them and their functionality with our own functional model, which integrates person to sociotechnical system and shows person-sociotechnical system interaction. This study clearly shows that if culture's basis is in shared mental models, then the question whether organization is or has culture is absurd. As Antonsen has pointed out certain mandatory organizational features are clearly structural and not cultural. We also emphasize the behavioural aspect when defining cultural issues. The shared mental model alone is not sufficient requirement to define a feature as a cultural artefact, nor is the behaviour all employees share. Behaviour or action is cultural artefact only when the members of the culture have truly free will to choose their behaviour.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Pori Department
Contributors: Porkka, P. L.
Number of pages: 6
Pages: 907-912
Publication date: 2016

Host publication information

Title of host publication: Chemical Engineering Transactions
Publisher: Italian Association of Chemical Engineering AIDIC
ISBN (Print): 9788895608396

Publication series

Name: Chemical Engineering Transactions
Volume: 48
ISSN (Electronic): 2283-9216
ASJC Scopus subject areas: Chemical Engineering(all)

Bibliographical note

JUFOID=70222

Source: Scopus
Source ID: 84976878615

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

Learning maths with mobiles: Cross-cultural design of technology with experiences in South-Africa and Finland

This chapter presents an overview of our experiences on cross-cultural design of technology in the context of mobile learning focusing on supporting learners to study mathematics in two different countries. The aim of our study is to discuss design issues from the perspective of two different types of cultures and reflect culturally sensitive issues based on a longitudinal study, which included empirical data from altogether over 3500 learners of grades 9 and 10. As a result we outline two focus areas: content and concept for best design practices. Furthermore, we argue that cross-cultural design of technology can help to identify culturally sensitive areas such as attitudes towards informal and collaborative learning and recognizing the local context for the content. Cross-cultural design of technology supports development of good user experience of mobile learning services for different local learning contexts.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Pervasive Computing, Research area: User experience
Contributors: Vainio, T., Walsh, T.
Number of pages: 18
Pages: 79-96
Publication date: 13 Jul 2015

Host publication information

Title of host publication: Integrating Touch-Enabled and Mobile Devices into Contemporary Mathematics Education
Publisher: IGI Global
ISBN (Print): 9781466687158
ISBN (Electronic): 9781466687141
ASJC Scopus subject areas: Social Sciences(all)

Bibliographical note

EXT="Vainio, Teija"

Source: Scopus
Source ID: 84957956201

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

The New Era of Crowdsourcing — Industrial Crowdsourcing

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Information Management and Logistics, Research group: Novi, Managing digital industrial transformation (mDIT), DIGILE – Finnish Center for Science and Innovation in the Internet Economy
Contributors: Kärkkäinen, H., Jussila, J., Erkinheimo, P.
Number of pages: 7
Pages: 25-31
Publication date: 2015

Host publication information

Title of host publication: Open Innovation Yearbook 2015
Place of publication: Brussel
Publisher: European Commission
Editor: Salmelin, B.
ISBN (Electronic): 978-92-79-43962-9
Keywords: crowdsourcing, industrial crowdsourcing

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

Jossakin vuoti öljy, muualla tihkuivat tiedot - etiikka katoavien rajojen ja suurten skandaalien aikakaudella

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Pori Department
Contributors: Lilja, K.
Number of pages: 16
Pages: 85-101
Publication date: 2015

Host publication information

Title of host publication: Silmät auki It-etiikkaan
Publisher: EDUSKUNNAN TULEVAISUUSVALIOKUNTA
ISBN (Print): 978-951-53-3581-4
ISBN (Electronic): 978-951-53-3582-1

Publication series

Name: Eduskunnan tulevaisuusvaliokunnan julkaisu
Publisher: Tulevaisuusvaliokunta
No.: 12
ISSN (Print): 2342-6594
ISSN (Electronic): 2342-6608

Bibliographical note

AUX=pla,"Lilja, Kari"

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

Townhouse-talotyypin rakennuskustannukset: kolmen suunnitteluratkaisun taloudellisuuden analysointi

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Civil Engineering
Contributors: Saari, A., Tauriainen, M.
Number of pages: 4
Pages: 94-97
Publication date: 2015

Host publication information

Title of host publication: Nollaa parempi – Townhouse energiatehokkaassa asuinrakentamisessa
Publisher: Aalto-yliopisto
ISBN (Print): 978-952-60-6409-3
ISBN (Electronic): 978-952-60-6410-9

Publication series

Name: Aalto University publication series Crossover
No.: 9/2015
ISSN (Print): 1799-4950
ISSN (Electronic): 1799-4969

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

Aluetehokkuuden kustannusvaikutukset

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Civil Engineering, Aalto University
Contributors: Nisula, J., Saari, A.
Number of pages: 6
Pages: 102-107
Publication date: 2015

Host publication information

Title of host publication: Nollaa parempi – Townhouse energiatehokkaassa asuinrakentamisessa
Publisher: Aalto-yliopisto
ISBN (Print): 978-952-60-6409-3
ISBN (Electronic): 978-952-60-6410-9

Publication series

Name: Aalto University publication series Crossover
No.: 9/2015
ISSN (Print): 1799-4950
ISSN (Electronic): 1799-4969

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

On service composition - dynamic formation and orchestration of service workflows

Service-oriented approach to system engineering makes engineers to rethink the way to build and maintain a system. Use of Web Service technologies enables to remove rigid connections between software components to reassemble them dynamically at run-time according to the actual needs of applications. Such an approach can in some cases provide additional necessary functionality, which may not have been envisioned at the design time. This chapter presents an approach to orchestration allowing dynamic formation of service hierarchies in in-line with production needs, which allows tracking on all the existing service workflows. Hence the locus of control for the overall system is kept. The use of eScop Manufacturing System Ontology (MSO) for orchestration purposes is also proposed to keep the track on orchestration workflows.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Automation Science and Engineering, Research group: Factory automation systems technology
Contributors: Lobov, A.
Number of pages: 9
Pages: 311-319
Publication date: 2015

Host publication information

Title of host publication: Open Knowledge-Driven Manufacturing and Logistics - The eScop Approach
Publisher: Warsaw University of Technology Publishing House
Editors: Strzelczak, S., Balda, P., Garetti, M., Lobov, A.
ISBN (Print): 978-83-7814-440-3

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

Classification of Knowledge Representation Implementations in the Manufacturing Systems Domain

Ontologies are presented as a powerful mechanism for integration of components that are located in different levels of the ISA-95 automation pyramid, which is widely known in the industrial automation domain. Hence, the development of systems that use knowledge representation is a feasible manner for the reduction of efforts, e.g. in vertical communication implementation. This kind of research is challenging because of the quantity of cross-layer information exchange. In fact, as industrial automation systems are, by nature, dynamic, process control components must be capable of adapting fast to changes. Furthermore, reconfiguration of scalable systems can be automated through ontology modeling. This chapter presents an investigation on how representation of knowledge is utilized in different industrial automation developments. In addition, main concepts and requirements for designing knowledge representation implementations are identified and described. Finally, according to this description, a classification of distinct implementations is also presented.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Automation Science and Engineering, Research group: Factory automation systems technology
Contributors: Ramis Ferrer, B.
Number of pages: 10
Pages: 235-244
Publication date: 2015

Host publication information

Title of host publication: Open Knowledge-Driven Manufacturing & Logistics : The eScop Approach
Publisher: Warsaw University of Technology Publishing House
Editors: Strzelczak, S., Balda, P., Garetti, M., Lobov, A.
ISBN (Print): 978-83-7814-440-3

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

A Proposal of Decentralized Architecture for OKD-MES

Recent research work in the industrial automation field determines that the computational power of embedded devices, which is used for process control on the shop floor, is sufficient for handling new functionalities. Therefore, it becomes possible to manage knowledge that is encapsulated in embedded devices, demonstrating a decentralized solution for controlling processes at the lowest level of the ISA-95 automation pyramid. This chapter argues that part of the OKD-MES functionality can be lowered to the device level. Moreover, the presented chapter exhibits that OKD-MES representation and management of knowledge can be distributed and handled in the shop floor, where devices are capable of controlling processes that are later executed by machines. Hence, this chapter offers an alternative for the actual architecture of OKDMES, which is now centralized in terms of knowledge management. Furthermore, concepts, requirements and an early architecture for developing a decentralized OKD-MES are also shown and discussed

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Automation Science and Engineering, Research group: Factory automation systems technology
Contributors: Ferrer, B. R.
Number of pages: 10
Pages: 331-340
Publication date: 2015

Host publication information

Title of host publication: Open Knowledge-Driven Manufacturing & Logistics : The eScop Approach
Place of publication: Warsaw
Publisher: Warsaw University of Technology Publishing House
Editors: Strzelczak, S., Balda, P., Garetti, M., Lobov, A.
ISBN (Print): 978-83-7814-440-3

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

Water services heritage and institutional diversity

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Department of Civil Engineering, Research group: Industrial Bioengineering and Applied Organic Chemistry
Contributors: Katko, T. S., Juuti, P., Pietilä, P., Rajala, R.
Publication date: 2015

Host publication information

Title of host publication: Water and Heritage: material, conceptual and spiritual connections
Publisher: Sidestone Press
Editors: Willems, W., van Schaik, H.
ISBN (Print): 9789088902789

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

Impact analysis of graph-based requirements models using PageRank algorithm

Managing requirements changes of complex systems and the potential impact of such changes represents a big issue for companies. Currently, commercial modelers propose tools for analyzing the direct impact of requirements changes on system design or code but the analysis of requirement change on other requirements remains seldom studied. This paper proposes an approach for the impact analysis of changes in requirements combined with a ranking of importance of requirements in graph based requirements network. Warshall algorithm is used in this paper for performing the impact analysis. Along with this approach, PageRank algorithm is used for ranking requirements according to their importance. Requirements hierarchy and their textual description of importance are considered as input for calculating their impact as well as their importance within the network of requirements. This combination of Warshall and PageRank algorithms provide significant results for helping designers in decision-making process of modifying requirements for future design versions.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Intelligent dexterity for secure networked infrastructure and applications (IDSNIA), Aalto Univ, Aalto University, Aalto Univ Finland, Dept Engn Design & Prod, Sch Engn
Contributors: Mokammel, F., Coatanea, E., Bakhouya, M., Christophe, F., Nonsiri, S.
Number of pages: 6
Pages: 731-736
Publication date: Apr 2013

Host publication information

Title of host publication: 2013 IEEE International Systems Conference (SysCon)
Publisher: IEEE
ISBN (Print): 978-1-4673-3108-1

Publication series

Name: 2013 IEEE International Systems Conference (SysCon)
Keywords: Complex system, Graph theory PageRank algorithm, Impact changes analysis, PageRank algorithm, Requirements management, Warshall algorithm, complex systems, decision making, decision-making process, design engineering, formal specification, graph based requirements network, graph theory, graph-based requirements models, impact analysis, importance textual description, large-scale systems, requirement change management, requirements hierarchy, system design
Source: Mendeley
Source ID: bd838215-a552-3824-ba9b-f763eec0af4f

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

OSS-TMM: Guidelines for improving the testing process of open source software

Open Source Software (OSS) products do not usually follow traditional software engineering development paradigms. Specifically, testing activities in OSS development may be quite different from those carried out in Closed Source Software (CSS) development. As testing and verification require a good deal of resources in OSS, it is necessary to have ways to assess and improve OSS testing processes. This paper provides a set of testing guidelines and issues that OSS developers can use to decide which testing techniques make most sense for their OSS products. This paper 1) provides a checklist that helps OSS developers identify the most useful testing techniques according to the main characteristics of their products, and 2) outlines a proposal for a method that helps assess the maturity of OSS testing processes. The method is a proposal of a Maturity Model for testing processes (called OSS-TMM). To show its usefulness, the authors apply the method to seven real-life projects. Specifically, the authors apply the method to BusyBox, Apache Httpd, and Eclipse Test and Performance Tools Platform to show how the checklist supports and guides the testing process of these OSS products.

General information

Publication status: Published
MoE publication type: A3 Part of a book or another research book
Organisations: Università degli Studi Dell'Insubria, Former organisation of the author
Contributors: Morasca, S., Taibi, D., Tosi, D.
Number of pages: 20
Pages: 59-78
Publication date: 28 Feb 2013

Host publication information

Title of host publication: Open Source Software Dynamics, Processes, and Applications
Publisher: IGI Global
ISBN (Print): 1466629371, 9781466629370
ISBN (Electronic): 9781466629387
ASJC Scopus subject areas: Computer Science(all)
Source: Scopus
Source ID: 84944882361

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

Glove-Integrated Textile Antenna with Reduced SAR for Wearable UHF RFID Reader

We present a wearable slotted patch antenna embedded in a glove for wearable UHF RFID reader. The antenna is fully-textile based, small enough to fit on the area in the back of the hand and achieves the realized gain of –1.3 dBi at 866 MHz in body-worn configuration. The paper outlines the numerical optimization of the antenna using a layered hand model and assessment of the specific absorption rate to determine the maximum output power of the reader that complies with the SAR safety limits. As a novel feature, we have designed an isolator layer of conductive textile that is adhered inside the glove underneath the antenna to achieve 10 percent reduction in the specific absorption rate (SAR) and 1.14 dBi improvement in the realized gain compared to our earlier work. With these marked improvements, the output power of the reader is not limited by SAR, but by the regular RFID emission limit. In the wireless testing, we have verified a detection range of 4.7 meters for a regular dipole type RFID tag with 3.19 WEIRP.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: BioMediTech, Research group: Wireless Identification and Sensing Systems Research Group
Contributors: Ahmed, S., Mehmood, A., Sydänheimo, L., Ukkonen, L., Björninen, T.
Number of pages: 5
Pages: 231-235
Publication date: 7 Nov 2019

Host publication information

Title of host publication: 2019 IEEE International Conference on RFID Technology and Applications (RFID-TA)
Publisher: IEEE
ISBN (Print): 978-1-7281-0590-1
ISBN (Electronic): 978-1-7281-0589-5
Keywords: slotted patch antenna, RFID reader antenna, UHF, wearable antenna, work glove application, e-textile
Source: Bibtex
Source ID: 8892251

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

Clothing-Integrated Passive RFID Strain Sensor Platform for Body Movement-Based Controlling

This paper introduces the fabrication and wireless performance evaluation of a passive ultra-high frequency (UHF) radiofrequency identification (RFID)-based strain sensor platform, which is designed for body movement-based human-technology interaction. The used RFID platform is fabricated from electro-textile materials and can thus be seamlessly integrated into clothing. A two-part antenna structure is utilized in this work to avoid the reliability challenges caused by mechanical stresses that clothing-integrated electronics need to endure. The fabricated sensor has an initial peak read range of 5 meters, which is an excellent result for on-body performance. Further, the platform is functional throughout the global UHF RFID frequency band. During elongation, the peak read range of the sensor has a significant decrease, but it is still readable from distances of 2.5 meters. Thus, this sensor can be read wirelessly from a convenient distance, when considering its practical use in body movement-based controlling of digital devices. The wireless performance of the sensor platform has a significant change caused by arm elongation, which based on our initial results can be clearly read from the changed backscattered signal. Thus, based on these preliminary results, our sensor platform shows potential as a passive clothing-integrated controller, which can turn simple gestures into inputs for digital devices.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: BioMediTech, Research group: Wireless Identification and Sensing Systems Research Group
Contributors: He, H., Chen, X., Ukkonen, L., Virkki, J.
Number of pages: 4
Pages: 236-239
Publication date: 7 Nov 2019

Host publication information

Title of host publication: 2019 IEEE International Conference on RFID Technology and Applications (RFID-TA)
Publisher: IEEE
ISBN (Print): 978-1-7281-0590-1
ISBN (Electronic): 978-1-7281-0589-5
Keywords: Electro-textiles, human-technology interaction, passive UHF RFID technology, strain sensor, clothing-integrated electronics
Source: Bibtex
Source ID: 8892118

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

High Peak Power Laser Diodes for Eye Safe LIDAR with Integrated Wavelength Locking Element

We report on the development of high peak-power broad-area laser diodes emitting in the 1.5 pm wavelength band for eye-safe LIDAR applications. The laser contain a monolithically integrated surface grating section for wavelength stabilization. The performance merits of the wavelength stabilized laser is benchmark against traditional Fabry-Pérot diodes fabricated within the same processing batch and having identical quantum-well design. The study demonstrates the efficacy of the surface-grating applied to broad-area lasers and the benefits rendered possible for decreasing the spectral linewidth and reducing the temperature drift of the wavelength. This type of high-power light source can improve the signal-to-noise ratio of eye-safe time-of-flight LIDARs in bright illumination conditions by making possible the use of narrow band-pass filters for reducing the ambient sunlight. Moreover, the same advantage to reject ambient signal is expected in other applications such as gated imaging [1], or when using a pulsed laser as the illuminator in high speed imaging applications. In addition, the variation in the emission wavelengths from wafer-to-wafer and from chip-to-chip is reduced compared to non-stabilized lasers.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research group: ORC, Physics
Contributors: Viheriälä, J., Aho, A. T., Virtanen, H., Reuna, J., Lyytikäinen, J., Guina, M.
Publication date: 17 Oct 2019

Host publication information

Title of host publication: 2019 Conference on Lasers and Electro-Optics Europe European Quantum Electronics Conference (CLEO/Europe-EQEC)
Publisher: IEEE
ISBN (Print): 978-1-7281-0470-6
ISBN (Electronic): 978-1-7281-0469-0
Keywords: Surface emitting lasers, Distributed Bragg reflectors, Gratings, Diode lasers, Laser stability
Source: Bibtex
Source ID: 8872661

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

Participatory service design and community involvement in designing future-ready sustainable learning landscapes

The United Nations Sustainable Development Goals (SDGs) work as a new agenda for sustainable development globally. Many if not most of the SDGs can be combined with different levels of education. This paper leans on previous work in Sustainable Education Design (SED), which looked at sustainability from its multifaceted angles with a broad global scope. The context of the study is a campus at a research-intensive Finnish university. The methodology entailed participatory service design approaches. For piloting, one classroom was chosen as a test bed. The data consist of workshops, use walks and structured interviews. The analysis started from identifying KPIs of sustainable learning environment creation, after which these were tested against Sustainable Education Design Criteria described in a manual book earlier. The key findings include nine preliminary alternative KPIs that were merged with previous SED criteria and related SDGs. The alternative KPIs were trialled in the test bed environment. These proposed alternative KPIs can be used as indicators for sustainability, innovation and learning during participatory change processes and in evaluating the outcome.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Civil Engineering, Research group: Responsible Construction, Helsinki University
Contributors: Sandström, N., Nevgi, A., Nenonen, S.
Publication date: 2 Sep 2019

Host publication information

Title of host publication: SBE 19 - Emerging Concepts for Sustainable Built Environment 22–24 May 2019, Helsinki, Finland
Publisher: IOP Publishing

Publication series

Name: IOP Conference Series: Earth and Environmental Science
Volume: 297
ISSN (Print): 1755-1307
ASJC Scopus subject areas: Environmental Science(all), Earth and Planetary Sciences(all)

Bibliographical note

jufoid=85001

Source: Scopus
Source ID: 85072832468

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

User-driven development with scientific applied research - RFID-controlled physiogame case study

The role of technology in health care is growing. One major challenge caused by the rapid evolvement of technologies, is the implementation and application of the latest technology advances into actual care practises. In this paper, we present how combination of scientific research and multidisciplinary applied research activities can boost the development of need-based solutions to real-life challenges. The paper concentrates on the ideation phase of the development process. This paper presents a case study, in which a body movement-controlled physiotherapy game is developed in close collaboration of technology developers and physiotherapy professionals. Textile-integrated passive UHF RFID tags are used as game controllers to enable identification of certain movements. The results indicate the early stage prototype used in the study to enhance ideation and identification of application areas for the technology. In addition, the joint development process, in which the clients (rehabilitation professionals) are involved from the beginning, is also found to create commitment to continue collaboration, by helping the technology developers to meet the needs and to take user group-specific requirements into account in the development. This kind of process serves multidisciplinary projects well.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: BioMediTech, Research group: Wireless Identification and Sensing Systems Research Group
Contributors: Merilampi, S., Ihanakangas, V., Virkki, J.
Number of pages: 4
Pages: 167-170
Publication date: 1 Sep 2019

Host publication information

Title of host publication: 2019 IEEE International Conference on RFID Technology and Applications (RFID-TA)
Publisher: IEEE
ISBN (Print): 978-1-7281-0590-1
ISBN (Electronic): 978-1-7281-0589-5
Keywords: passive UHF RFID technology, research collaboration, self-managed rehabilitation, serious games, wearable electronics, women in RFID

Bibliographical note

EXT="Merilampi, Sari"

Source: Bibtex
Source ID: 8892150

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

A Batteryless Semi-Passive RFID Sensor Platform

Semi-passive RFID sensor possesses longer interrogation distance and advanced functionalities compared with the fully passive ones. Utilizing the wireless energy harvesting, we present a semi-passive RFID sensor platform without the reliance on the external battery. We outline the sensor system development and conduct the wireless measurement of the prototype to demonstrate its performance and functionality.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: BioMediTech, Research group: Wireless Identification and Sensing Systems Research Group, Heriot-Watt University
Contributors: Ma, S., Pournoori, N., Sydänheimo, L., Ukkonen, L., Björninen, T., Georgiadis, A.
Number of pages: 3
Pages: 171-173
Publication date: 1 Sep 2019

Host publication information

Title of host publication: 2019 IEEE International Conference on RFID Technology and Applications (RFID-TA)
Publisher: IEEE
ISBN (Print): 978-1-7281-0590-1
ISBN (Electronic): 978-1-7281-0589-5
Keywords: semi-passive RFID, UHF RFID, temperature sensor, RF energy harvesting
Source: Bibtex
Source ID: 8892176

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

Discovering collaborative and inclusive solutions to co-create multidimensional value in cross-sector collaboration

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Information and Knowledge Management, Research group: Knowledge and Learning Research Center, Hanken School of Economics
Contributors: Vuori, V., Bor, S., Polsa, P., Käpylä, J., Helander, N.
Number of pages: 6
Pages: 364-369
Publication date: Sep 2019

Host publication information

Title of host publication: Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management : 17-19 September, 2019, Vienna, Austria
Publisher: SCITEPRESS
ISBN (Print): 9789897583827

Publication series

Name: IC3K 2019 - Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management
Volume: 3

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

Research-industry collaboration: a review of the literature on evaluation methods and motivations

Relationships and collaborations between research and industry play an essential role in sustaining innovation. Therefore, different types of innovation models developed to refer to a set of interaction channels, mechanism and forms of linkage between academia and industry. The latter studies highlight enhancing and diminishing factors of collaboration management, practices on knowledge interactions and collaborative relationships on various levels depending on considered industrial sectors. This review establishes the state of current knowledge in the field and classifies key metrics and indicators for evaluation of research-industry collaboration linkage.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial Engineering and Management, Research group: Center for Innovation and Technology Research, CERN, European Organization for Nuclear Research (CERN)
Contributors: Solodko, A., Mäkinen, S., Lasheras, N. C., Bedolla, J. S., Saari, U.
Number of pages: 7
Publication date: 29 Aug 2019

Host publication information

Title of host publication: PICMET 2019 Conference : August 25-29, 2019, Portland, Oregon, USA
Place of publication: Portland
Article number: 19R0108
ISBN (Electronic): 978-1-890843-40-3

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

Visibility-Aware Part Coding for Vehicle Viewing Angle Estimation

A number of spatially-localised semantic parts of vehicles sensitive to pose changes are encoded their visible probabilities into a mid-level feature vector. Car pose estimation is then formulated into a regression on concatenated low-and mid-level features to continuously changing viewing angles. Each dimension of our visibility-Aware part codes separates all the training samples into two groups according to its visual existence in images, which provides additional part-specific range constraint of viewing angles. Moreover, the proposed codes can alleviate the suffering from sparse and imbalanced data distribution in the light of modelling latent dependency across angle targets. Experimental evaluation for car pose estimation on the EPFL Multi-View Car benchmark demonstrates significant improvement of our method over the state-of-The-Art regression methods, especially when only sparse and imbalanced data is available.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences, Research group: Vision, South China University of Technology
Contributors: Yang, D., Qian, Y., Cai, D., Yan, S., Kämäräinen, J., Chen, K.
Number of pages: 6
Pages: 65-70
Publication date: 1 Aug 2019

Host publication information

Title of host publication: 9th International Conference on Information Science and Technology, ICIST 2019
Publisher: IEEE
ISBN (Electronic): 9781728121062
ASJC Scopus subject areas: Computer Science Applications, Computer Vision and Pattern Recognition, Information Systems, Computational Mathematics, Control and Optimization
Keywords: Car pose estimation, Coding, Pose-sensitive parts, Regression forests, Visibility-Aware

Bibliographical note

EXT="Chen, Ke"
jufoid=79229

Source: Scopus
Source ID: 85073236772

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

Enabling cybersecurity incident reporting and coordinated handling for maritime sector

The maritime industry is experiencing a new era of digital transformation. At the same time as the number of cyberattacks and cybersecurity incidents are increasing, cybersecurity awareness and incident reporting in this sector remains low. In this paper, we describe a cybersecurity incident reporting system for the maritime industry that aims to address this issue. The work focuses on autonomous and unmanned vessels, but can be equally applied to other areas of the maritime industry. The proposed approach has been evaluated experimentally and the results demonstrate its applicability and feasibility.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences, Research area: Information security
Contributors: Silverajan, B., Vistiaho, P.
Number of pages: 8
Pages: 88-95
Publication date: 1 Aug 2019

Host publication information

Title of host publication: 2019 14th Asia Joint Conference on Information Security, AsiaJCIS 2019
Publisher: IEEE
ISBN (Electronic): 9781728125565
ASJC Scopus subject areas: Software, Information Systems and Management, Computer Networks and Communications, Safety, Risk, Reliability and Quality
Keywords: Cybersecurity incident exchange, Maritime cybersecurity, Smart ports, Smart ships
Source: Scopus
Source ID: 85073414912

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

Profile extraction and deep autoencoder feature extraction for elevator fault detection

In this paper, we propose a new algorithm for data extraction from time series signal data, and furthermore automatic calculation of highly informative deep features to be used in fault detection. In data extraction elevator start and stop events are extracted from sensor data, and a generic deep autoencoder model is also developed for automated feature extraction from the extracted profiles. After this, extracted deep features are classified with random forest algorithm for fault detection. Sensor data are labelled as healthy and faulty based on the maintenance actions recorded. The remaining healthy data are used for validation of the model to prove its efficacy in terms of avoiding false positives. We have achieved 100% accuracy in fault detection along with avoiding false positives based on new extracted deep features, which outperforms results using existing features. Existing features are also classified with random forest to compare results. Our developed algorithm provides better results due to the new deep features extracted from the dataset compared to existing features. This research will help various predictive maintenance systems to detect false alarms, which will in turn reduce unnecessary visits of service technicians to installation sites.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Automation Technology and Mechanical Engineering, Research group: Innovative Hydraulic Automation
Contributors: Mishra, K., Krogerus, T., Huhtala, K.
Number of pages: 8
Pages: 313-320
Publication date: 28 Jul 2019

Host publication information

Title of host publication: 16th International Conference on Signal Processing and Multimedia Applications : SIGMAP 2019, 26-28 July, 2019, Prague, Czech Republic
Volume: 16
Place of publication: Prague, Czech Republic
Publisher: SCITEPRESS
Editor: Callegari, C.
Edition: 2019
ISBN (Print): 978-989-758-378-0
ISBN (Electronic): 978-989-758-378-0

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

Empirical study of good, bad and ugly modular engineering solutions in machinery manufacturing industry

This study examines the relationship between the product structuring principles chosen in modular product families and the business results of companies. In the three case studies of the article, it can be seen that products that meet the modularity definitions discussed in the literature have been able to utilise the benefits of modularity in a very varied way. In one business case, the effect of modularity on business has been negative. In two other cases, the effect has been positive - in one of these even the profitability of the business has significantly improved. The aim of this article is to identify whether product designing consistently has been following some product structuring principles previously mentioned in modularisation literature or whether case studies bring new principles to consciousness. In all case studies, the product structuring principles used are also discussed in the previous modularisation studies at a varying extent. In the discussion section, we raise the question of whether the recording and use of product structuring principles in design briefs could lead to making the product design decisions that affect the business positively.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Automation Technology and Mechanical Engineering, Research area: Design, Development and LCM
Contributors: Juuti, T., Pakkanen, J., Lehtonen, T.
Number of pages: 10
Pages: 2981-2990
Publication date: 26 Jul 2019

Host publication information

Title of host publication: Proceedings of the Design Society: International Conference on Engineering Design : The 22nd International Conference on Engineering Design, ICED19, Delft, The Netherlands, 5-8 August 2019
Publisher: Cambridge University Press

Publication series

Name: Proceedings of the Design Society: International Conference on Engineering Design
ISSN (Electronic): 2220-4342

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

Actors’ agency in the routines of innovation project portfolio management

Innovation project portfolio management (IPPM) is carried out through various routines of assessing, prioritizing, selecting and coordinating projects. Empirical research increasingly suggests that the official routines are not necessarily used, but personnel use agency, i.e., individual situation-specific judgment in their practice of IPPM. This agency perspective is not sufficiently understood, so far. The purpose of this study is to explore different actors’ agency in implementing IPPM, covering managers, personnel and external stakeholders. The goal is increased knowledge on implementing IPPM in dynamic contexts and development of propositions for better IPPM frameworks that account for different actors’ agency. The qualitative case study with two innovative project-based firms reveals different approaches to IPPM agency across four different actor categories. The nature of the innovation project portfolios is discussed especially in terms of uncertainty and the maturity of the IPPM routines as situation-specific factors relevant in enabling and restraining project actors’ agency in IPPM. The results contribute by proposing agency as a novel perspective to IPPM research, showing evidence of it in highly innovative contexts, and thereby enabling the theorization of situation-specific practice of IPPM.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial Engineering and Management, Research group: Center for Research on Operations Projects and Services, Research group: Center for Research on Project and Service Business (CROPS)
Contributors: Martinsuo, M., Vuorinen, L.
Number of pages: 26
Publication date: 26 Jun 2019

Host publication information

Title of host publication: Proceedings of the EURAM European Academy of Management Conference 2019 : 26-28 June 2019, Lisbon, Portugal
Publisher: European Academy of Management, EURAM
ISBN (Electronic): 978-2-9602195-1-7

Publication series

Name: EURAM conference
ISSN (Print): 2466-7498

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

The circular economy of projects

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial Engineering and Management, Research group: Center for Research on Project and Service Business (CROPS)
Contributors: Ahola, T., Martinsuo, M.
Publication date: Jun 2019

Host publication information

Title of host publication: European Academy of Management Conference EURAM 2019 : 26-28 June, Lisbon, Portugal
ISBN (Electronic): 978-2-9602195-1-7

Publication series

Name: European academy of management annual conference
ISSN (Print): 2466-7498

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

Normalization of deviance in the construction industry, a managerial perspective

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial Engineering and Management, Research group: Center for Research on Project and Service Business (CROPS), London South Bank University (LSBU) and CIB, NTNU Norwegian University of Science and Technology
Contributors: Hajikazemi, S., Ahola, T., Aaltonen, K., Aarseth, W., Andersen, B.
Publication date: Jun 2019

Host publication information

Title of host publication: European Academy of Management Conference 2019, EURAM : 26-28 June, Lissabon, Portugal
ISBN (Electronic): 978-2-9602195-1-7

Publication series

Name: European academy of management annual conference
ISSN (Electronic): 2466-7498

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

Knowledge management practices to overcome network-level knowledge barriers: an artificial intelligence powered literature review

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Information and Knowledge Management, Research group: Knowledge and Learning Research Center
Contributors: Vuori, V., Helander, N.
Publication date: Jun 2019

Host publication information

Title of host publication:  Proceedings of International Forum on Knowledge Asset Dynamics 2019 : 5-7 June 2019, Matera, Italy
ISBN (Electronic): 978-88-96687-12-3

Publication series

Name: IFKAD Proceedings eBooks
ISSN (Electronic): 2280-787X

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

Double-side pumped membrane external-cavity surface-emitting laser (MECSEL) with increased efficiency emitting > 3 W in the 780 nm region

We demonstrate a double-side pumped MECSEL emitting more than 3 W of output power in the 780 nm wavelength region. The laser exhibits an efficiency as high as 34.4 %.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics
Contributors: Kahle, H., Phung, H., Penttinen, J., Rajala, P., Tukiainen, A., Ranta, S., Guina, M.
Publication date: 1 May 2019

Host publication information

Title of host publication: 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings
Publisher: IEEE
ISBN (Electronic): 9781943580576
ASJC Scopus subject areas: Spectroscopy, Industrial and Manufacturing Engineering, Safety, Risk, Reliability and Quality, Management, Monitoring, Policy and Law, Electronic, Optical and Magnetic Materials, Radiology Nuclear Medicine and imaging, Instrumentation, Atomic and Molecular Physics, and Optics

Bibliographical note

INT=phys,"Rajala, Patrik"

Source: Scopus
Source ID: 85069191246

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

Optical Frequency Comb Photoacoustic Spectroscopy

We combine for the first time a mid-infrared optical frequency comb Fourier transform spectrometer with cantilever-enhanced photoacoustic detection and measure high-resolution broadband spectra of the fundamental band of methane in a few milliliter sample volume.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, Energy Technology and Thermal Process Chemistry, University of Helsinki
Contributors: Sadiek, I., Mikkonen, T., Vainio, M., Toivonen, J., Foltynowicz, A.
Publication date: 1 May 2019

Host publication information

Title of host publication: 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings
Publisher: IEEE
ISBN (Electronic): 9781943580576
ASJC Scopus subject areas: Spectroscopy, Industrial and Manufacturing Engineering, Safety, Risk, Reliability and Quality, Management, Monitoring, Policy and Law, Electronic, Optical and Magnetic Materials, Radiology Nuclear Medicine and imaging, Instrumentation, Atomic and Molecular Physics, and Optics
Source: Scopus
Source ID: 85069190764

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

Frequency Comb Generation in a Continuous-Wave Pumped Second-Order Nonlinear Waveguide Resonator

Optical frequency comb generation has been experimentally studied using an integrated system based on a lithium niobate waveguide resonator featuring a strong quadratic nonlinearity. Our theoretical model shows good agreement with the experimental results.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, Paderborn University, University of Helsinki, VTT Technical Research Centre of Finland
Contributors: Abdallah, Z., Stefszky, M., Ulvila, V., Silberhorn, C., Vainio, M.
Publication date: 1 May 2019

Host publication information

Title of host publication: 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings
Publisher: IEEE
ISBN (Electronic): 9781943580576
ASJC Scopus subject areas: Spectroscopy, Industrial and Manufacturing Engineering, Safety, Risk, Reliability and Quality, Management, Monitoring, Policy and Law, Electronic, Optical and Magnetic Materials, Radiology Nuclear Medicine and imaging, Instrumentation, Atomic and Molecular Physics, and Optics
Source: Scopus
Source ID: 85069196416

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

High-Q resonance train in a plasmonic metasurface

We experimentally demonstrate a plasmonic surface that supports a series of high-quality-factor (Q ≈ 100) surface lattice resonances. These resonances are enabled by tuning the thickness of the top-cladding layer to confine higher order diffraction-orders.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, University of Ottawa, Canada, Iridian Spectral Technologies, University of Rochester Institute of Optics
Contributors: Saad-Bin-Alam, M., Reshef, O., Huttunen, M. J., Carlow, G., Sullivan, B., Menard, J. M., Dolgaleva, K., Boyd, R. W.
Publication date: 1 May 2019

Host publication information

Title of host publication: 2019 Conference on Lasers and Electro-Optics, CLEO 2019 - Proceedings
Publisher: IEEE
ISBN (Electronic): 9781943580576
ASJC Scopus subject areas: Spectroscopy, Industrial and Manufacturing Engineering, Safety, Risk, Reliability and Quality, Management, Monitoring, Policy and Law, Electronic, Optical and Magnetic Materials, Radiology Nuclear Medicine and imaging, Instrumentation, Atomic and Molecular Physics, and Optics
Source: Scopus
Source ID: 85069156893

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

A Semantic Meta-Model Repository for Lightweight M2M

One of the biggest problems in managing devices for the Internet of Things (IoT) is the ability for a management server to independently discover and retrieve data models for vendor-specific devices. At the same time, several device management methods also lack methods for device vendors to share their data models in a consistent manner. This paper presents the design and implementation of a repository that can flexibly accommodate many needs with regards to these issues, and allows device vendors to publish semantically similar data models as well as attach meta-data to these models. A Machine-to-Machine (M2M) communication interface also allows a management server to communicate with the repository. We show how these techniques can be used with the Lightweight Machine-to-Machine (LWM2M) standard.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences, Research area: Information security, Ericsson
Contributors: Silverajan, B., Zhao, H., Kamath, A.
Number of pages: 5
Pages: 468-472
Publication date: 11 Apr 2019

Host publication information

Title of host publication: 2018 IEEE International Conference on Communication Systems, ICCS 2018
Publisher: IEEE
ISBN (Electronic): 9781538678640
ASJC Scopus subject areas: Computer Networks and Communications, Hardware and Architecture, Information Systems and Management, Aerospace Engineering
Keywords: data model repository, IoT device management, LWM2M
Source: Scopus
Source ID: 85065038511

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

Muovipäällysteisten lattioiden vaurioituminen kosteuden vaikutuksesta

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Civil Engineering, Research group: Concrete and Bridge Structures, Materials Science and Environmental Engineering, Research group: Service Life Engineering of Structures, Research area: Structural Engineering
Contributors: Leivo, V., Sarlin, E., Suonketo, J., Pikkuvirta, J., Pentti, M.
Number of pages: 6
Pages: 383-388
Publication date: 14 Mar 2019

Host publication information

Title of host publication: Sisäilmastoseminaari 2019: 14.3.2019 : Sisäilmayhdistys raportti 37
Publisher: SIY SISÄILMATIETO OY
ISBN (Electronic): 978-952-5236-49-1

Publication series

Name: SIY Raportti
Publisher: SIY Sisäilmatieto Oy
No.: 37
ISSN (Electronic): 1237-1866

Bibliographical note

INT=ceng,"Pikkuvirta, Jussa"

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

Large mode area double clad ytterbium tapered fiber with circular birefringency

We demonstrated, for the first time to our best knowledge, an active tapered double clad fiber with circular birefringence and 35 μm core diameter. The output radiation had perfect beam quality (M2=1.18/1.1) and linearly polarized light with 15 dB of PER. The developed double clad active fiber was investigated for amplification of picosecond pulses in allfiber MOPA system. The MOPA system delivered 50 ps pulses with 55 W of the average power revealed 34.4 dB gain of the booster amplifier.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, Research group: Nanophotonics, Tampere University, Ampliconyx Ltd, Kotel'nikov Institute of Radio Engineering and Electronics
Contributors: Rissanen, J., Fedotov, A., Noronen, T., Gumenyuk, R., Chamorovskii, Y., Kolosovskii, A., Voloshin, V., Vorobev, I., Odnoblyudov, M., Filippov, V.
Number of pages: 8
Publication date: 7 Mar 2019

Host publication information

Title of host publication: Proceedings of SPIE : Fiber Lasers XVI: Technology and Systems
Publisher: SPIE-INT SOC OPTICAL ENGINEERING
Editors:  Carter, A. L., Dong, L.

Publication series

Name: Proceedings of SPIE
Publisher: SPIE
Volume: 10897
ISSN (Print): 0277-786X
Keywords: polarization, ytterbium, picosecond phenomena, birefringence, fiber amplifier, fiber laser

Bibliographical note

jufoid=71479
EXT="Noronen, Teppo"

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

Analysis of upconversion nanoparticles as an active medium for upconversion light sources

In the presented work, we investigated the optical and thermal stability of upconversion nanoparticles based on the three widely used matrices (NaYF4, Y2O3, LaF3). Analysis of the upconversion emission as a function of pump power density in a wide range revealed a multi-stage functional dependence. The stages of linear growing, saturation and degradation with both reversible and irreversible characters were discovered. For matrices of nanoparticles with low-temperature stability (NaYF4), the dependence proves to be irreversible that could cause by a change in the structure and chemical composition of the matrix. Reversible dependence occurs in matrices with high-temperature stability (Y2O3 and LaF3) and is caused by multiphonon nonradiative relaxation, which can be temperature-stimulated because of self-heating and low air-cooling of the crystal matrixes with low thermal conductivity.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, Research group: Nanophotonics, A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, Institute of Physics, University of Tartu
Contributors: Fedotov, A., Pominova, D., Orlovskaya, E., Orlovskii, Y., Niemi, T., Gumenyuk, R.
Number of pages: 9
Publication date: 1 Mar 2019

Host publication information

Title of host publication: Proceedings of SPIE : Optical Components and Materials XVI
Volume: 10914
Publisher: S P I E - International Society for Optical Engineering
Article number: 109140R
ISBN (Print): 9781510624702

Publication series

Name: Proceedings of SPIE : the International Society for Optical Engineering
Publisher: SPIE, The International Society for Optical Engineering
Volume: 10914
ISSN (Print): 0277-786X
ISSN (Electronic): 1996-756X
Keywords: upconversion, nanoparticles, luminescence, erbium, ytterbium, light sources

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

A model for profiling information and knowledge management in the public sector

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial Engineering and Management, Information and Knowledge Management, Research group: Operations and Supply Chain Group (OSCG)
Contributors: Jääskeläinen, A., Sillanpää, V., Helander, N.
Publication date: 2019

Host publication information

Title of host publication: Proceedings of 14th IFKAD 2019 conference : Matera, Italy, 5-7 June.
ISBN (Electronic): 978-88-96687-12-3

Publication series

Name: Proceedings IFKAD
ISSN (Electronic): 2280-787X

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

Mean and variability in RNA polymerase numbers are correlated to the mean but not the variability in size and composition of Escherichia coli cells

Cell morphology differs with cell physiology in general and with gene expression in particular. We investigate the degree to which these relationships differ with medium richness. Using Escherichia coli cells with fluorescently tagged β' subunits, flow cytometry, and statistical analysis, we study at the single-cell level the correlation between parameters associated to cell morphology and composition (FSC, SSC, and Width channels) and GFP tagged RNA polymerase (RNAp) levels (FITC channel). From measurements in three media differing in richness (M63, LB, and TB) and, thus, cell growth rates, we find that the mean and cell-to-cell variability in RNAp levels are correlated to the mean values of FSC, SSC, and/or Width. Further, in all growth conditions considered, RNAp levels are positively correlated to FSC, SSC, and Width at the single-cell level, with the correlation decreasing for increasing medium richness. Overall, the results suggest that the mean and cell-to-cell variability in levels of RNAp, a master regulator of gene expression, are correlated to the mean values of the parameters assessing the cellular morphology and composition, as measured by flow cytometry, but they do not correlate to the degree of variability of these parameter values.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research group: Laboratory of Biosystem Dynamics-LBD, BioMediTech, Department of Chemistry and Bioengineering
Contributors: Almeida, B., Chauhan, V., Kandavalli, V., Ribeiro, A.
Number of pages: 8
Pages: 226-233
Publication date: 2019

Host publication information

Title of host publication: BIOINFORMATICS 2019 - 10th International Conference on Bioinformatics Models, Methods and Algorithms, Proceedings; Part of 12th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2019
Publisher: SCITEPRESS
Editors: De Maria, E., Gamboa, H., Fred, A.
ISBN (Electronic): 9789897583537
ASJC Scopus subject areas: Biomedical Engineering, Electrical and Electronic Engineering
Keywords: Cell-to-cell Variability, Flow Cytometry, RNA Polymerase, Single-cell Biology, Statistical Analysis
Source: Scopus
Source ID: 85064697521

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

Random lasing control with optical spatial solitons in nematic liquid crystals

We discuss the synergy of reorientational self-focusing and random lasing in a dye- doped nematic liquid crystalline material. The laser emission resulting from amplification and multiple scattering inside the medium can be either modulated or triggered depending on the energy of the visible pump beam and the power of the near-infrared spatial soliton, respectively exciting the two nonlinear responses. Moreover, the presence of the self-induced waveguide improves the properties of the emitted beam, i. e., directionality and profile. Finally, the laser light can be re-directed by steering the spatial soliton with the aid of an external low-frequency electric field.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, Research group: Nonlinear Optics, University “Roma Tre”, Case Western Reserve University, Univ Roma Tre, Roma Tre University, Dept Elect Engn, NooEL
Contributors: Piccardi, A., Perumbilavil, S., Kauranen, M., Strangi, G., Assanto, G.
Number of pages: 5
Pages: 289-293
Publication date: 2019

Host publication information

Title of host publication: PHOTOPTICS 2019 - Proceedings of the 7th International Conference on Photonics, Optics and Laser Technology
Publisher: SCITEPRESS
Editors: Ribeiro, P., Raposo, M., Andrews, D.
ISBN (Electronic): 9789897583643
ASJC Scopus subject areas: Atomic and Molecular Physics, and Optics
Keywords: Nematic Liquid Crystals, Optical Spatial Solitons, Random Laser

Bibliographical note

EXT="Assanto, Gaetano"

Source: Scopus
Source ID: 85064602881

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

MECSELs with direct emission in the 760 nm to 810 nm spectral range: A single- and double-side pumping comparison and high-power continuous-wave operation

We compared single-side pumping (SSP) and double-side pumping (DSP) of a semiconductor membrane external-cavity surface-emitting laser (MECSEL). The MECSEL's active region was based on a 4×3 AlGaAs quantum well (QW) structure. This structure was embedded between two silicon carbide (SiC) wafer pieces that were used as transparent intra-cavity (IC) heat spreaders creating a symmetrical cooling environment. The MECSEL structure targeted emission at 780nm and was operated at 20°C heat sink temperature. Via DSP the differential efficiency was improved from 31.9% to 34.4 %. The laser threshold was reduced from 0.79 W to 0.69 W of absorbed pump power while the maximum output power was increased from 3.13 W to 3.22 W. The DSP configuration enabled these improvements by a reduced thermal resistance of the gain element by 9 %. The MECSEL operated at a fundamental Gaussian TEM00 mode profile and the beam quality was measured to be M2 <1.09. We further demonstrate a maximum tuning range from 767 nm to 811 nm. A similar active region with about half the thickness (2×3 AlGaAs QWs) was investigated using the DSP configuration and first results are presented here. 500-μm-thick sapphire IC heat spreaders were used instead of SiC. The output power exceeded 0.5W and the emission was spectrally located around 770 nm.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics
Contributors: Kahle, H., Penttinen, J. P., Phung, H. M., Rajala, P., Tukiainen, A., Ranta, S., Guina, M.
Publication date: 2019

Host publication information

Title of host publication: Vertical External Cavity Surface Emitting Lasers (VECSELs) IX
Publisher: SPIE, IEEE
Editor: Keller, U.
Article number: 109010D
ISBN (Electronic): 9781510624443

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 10901
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: AlGaAs, DBR-free, MECSEL, Near infra-red, Thermal management, Thermal resistance, VECSEL

Bibliographical note

INT=phys,"Rajala, Patrik"
jufoid=71479

Source: Scopus
Source ID: 85066635597

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

1.55-μm wavelength wafer-fused OP-VECSELs in flip-chip configuration

Optically-pumped vertical external cavity surface emitting lasers (VECSELs) based on flip-chip gain mirrors emitting at the 1.55-μm wavelength range are reported. The gain mirrors employ wafer-fused InAlGaAs/InP quantum well heterostructures and GaAs/AlAs distributed Bragg reflectors, which were incorporated in a linear and a V-cavity configurations. A maximum output power of 3.65 W was achieved for a heatsink temperature of 11°C and employing a 2.2% output coupler. The laser exhibited circular beam profiles for the full emission power range. The demonstration represents more than 10-fold increase of the output power compared to state-of-the-art flip-chip VECSELs previously demonstrated at the 1.55-μm wavelength range, and opens a new perspective for developing practical VECSEL-based laser system for applications such as LIDAR, spectroscopy, communications and distributed sensing.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, CRPP, LakeDiamond SA
Contributors: Mereuta, A., Nechay, K., Caliman, A., Suruceanu, G., Gallo, P., Guina, M., Kapon, E.
Publication date: 2019

Host publication information

Title of host publication: Vertical External Cavity Surface Emitting Lasers (VECSELs) IX
Publisher: SPIE, IEEE
Editor: Keller, U.
Article number: 1090103
ISBN (Electronic): 9781510624443

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 10901
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: Optically-pumped VECSELs, Semiconductor lasers, Wafer-Fusion

Bibliographical note

jufoid=71479

Source: Scopus
Source ID: 85066636665

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

From monolithic systems to microservices: A decomposition framework based on process mining

Decomposition is one of the most complex tasks during the migration from monolithic systems to microservices, generally performed manually, based on the experience of the software architects. In this work, we propose a 6-step framework to reduce the subjectivity of the decomposition process. The framework provides software architects with a set of decomposition options, together with a set of measures to evaluate and compare their quality. The decomposition options are identified based on the independent execution traces of the system by means of the application of a process-mining tool to the log traces collected at runtime. We validated the process, in an industrial project, by comparing the proposed decomposition options with the one proposed by the software architect that manually analyzed the system. The application of our framework allowed the company to identify issues in their software that the architect did not spot manually, and to discover more suitable decomposition options that the architect did not consider. The framework could be very useful also in other companies to improve the quality of the decomposition of any monolithic system, identifying different decomposition strategies and reducing the subjectivity of the decomposition process. Moreover, researchers could extend our approach increasing the support and further automating the decomposition support.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences, TASE - Tampere Software Engineering Research Group
Contributors: Taibi, D., Systä, K.
Number of pages: 12
Pages: 153-164
Publication date: 2019

Host publication information

Title of host publication: CLOSER 2019 - Proceedings of the 9th International Conference on Cloud Computing and Services Science
Publisher: SCITEPRESS
Editors: Ferguson, D., Munoz, V. M., Helfert, M., Pahl, C.
ISBN (Electronic): 9789897583650
ASJC Scopus subject areas: Computer Science (miscellaneous), Computer Science Applications
Keywords: Cloud-native, Microservice decomposition, Microservice migration, Microservice slicing, Microservices
Source: Scopus
Source ID: 85067463647

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

405-nm pumped Ce3+-doped silica fiber for broadband fluorescence from cyan to red

A pure Ce-doped silica fiber is fabricated using modified chemical vapor deposition (MCVD) technique. Fluorescence characteristics of a Ce-doped silica fiber are experimentally investigated with continuous wave pumping from 440 nm to 405 nm. Best pump absorption and broad fluorescence spectrum is observed for ∼ 405 nm laser. Next, the detailed analysis of spectral response as a function of pump power and fiber length is performed. It is observed that a-10dB spectral width of ∼ 280 mn can be easily achieved with different combinations of the fiber length and pump power. Lastly, we present, for the first time to the best of our knowledge, a broadband fluorescence spectrum with-10dB spectral width of 301 nm, spanning from ∼ 517.36 nm to ∼ 818 nm, from such fibers with non-UV pump lasers.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, Aston University, Fiber Optics Research Center of the Russian Academy of Sciences, Russian Academy of Sciences
Contributors: Yadav, A., Chichkov, N. B., Gumenyuk, R., Zherebtsov, E., Melkumov, M. A., Yashkov, M. V., Dianov, E. M., Rafailov, E. U.
Publication date: 2019

Host publication information

Title of host publication: Optical Components and Materials XVI
Publisher: SPIE, IEEE
Editors: Digonnet, M. J. F., Jiang, S.
Article number: 1091406
ISBN (Electronic): 9781510624702

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 10914
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: Broadband spectrum, Ce-doped fiber, Ce-ion, Rare earth doped

Bibliographical note

jufoid=71479

Source: Scopus
Source ID: 85066046508

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

Observation of local electroluminescent cooling and identifying the remaining challenges

The cooling of a light emitting diode (LED) by photons carrying out more energy than was used to electrically bias the device, has been predicted decades ago. 1, 2 While this effect, known as electroluminescent cooling (ELC), may allow e.g. fabricating thermophotonic heat pumps (THP) providing higher efficiencies than the existing solid state coolers, 3 ELC at powers sufficient for practical applications is still not demonstrated. To study high-power ELC we use double diode structures (DDSs), which consist of a double heterojunction (DHJ) LED and a photodiode (PD) grown within a single technological process and, thus, enclosed in a cavity with a homogeneous refractive index. 4, 5 The presence of the PD in the structure allows to more directly probe the efficiency of the LED, without the need for light extraction from the system, reducing undesirable losses. Our analysis of experimentally measured I - V curves for both the LED and the PD suggests that the local efficiency of the high-performance LEDs we have fabricated is approximately 110%, exceeding unity over a wide range of injection current densities of up to about 100A/cm 2 . At present the efficiency of the full DDS, however, still falls short of unity, not allowing direct evidence of the extraction of thermal energy from the LED. Here we review our previous studies of DDS for high-power EL cooling and discuss in more detail the remaining bottlenecks for demonstrating high-power ELC in the DDS context: the LED surface states, resistive and photodetection losses. In particular we report our first surface passivation measurements. Further optimization therefore mainly involves reducing the influence of the surface states, e.g. using more efficient surface passivation techniques and optimizing the PD. This combined with the optimization of the DDS layer thicknesses and contact metallization schemes is expected to finally allow purely experimental observation of high-power ELC.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, Aalto University
Contributors: Radevici, I., Sadi, T., Tripurari, T., Tiira, J., Ranta, S., Tukiainen, A., Guina, M., Oksanen, J.
Publication date: 2019

Host publication information

Title of host publication: Photonic Heat Engines : Science and Applications
Publisher: SPIE, IEEE
Editors: Seletskiy, D. V., Epstein, R. I., Sheik-Bahae, M.
Article number: 109360A
ISBN (Electronic): 9781510625143

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 10936
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: Double diode structures, Electroluminescent cooling, III-V semiconductors, Quantum efficiency, Surface states

Bibliographical note

jufoid=71479

Source: Scopus
Source ID: 85065604697

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

1.3μm U-bend traveling wave SOA devices for high efficiency coupling to silicon photonics

We present a U-bend design for traveling wave III-V gain devices, such as semiconductor optical amplifiers and laser diodes. The design greatly simplifies the butt-coupling between the III-V chip and silicon-on-insulator photonic circuit by bringing the I/O ports on one facet. This removes the need for precise dimension control otherwise required for 2-side coupling, therefore increasing the yield of mounted devices towards 100%. The design, fabrication and characterization of the U-bend device based on Euler bend geometry is presented. The losses for a bend with a minimum bending radius of 83 μm are 1.1 dB. In addition, we present an analysis comparing the yield and coupling losses of the traditionally cleaved devices with the results that the Euler bend approach enable, with the final conclusion that the yield is improved by several times while the losses are decreased by several dB.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Physics, VTT Technical Research Centre of Finland
Contributors: Viheriälä, J., Tuorila, H., Zia, N., Cherchi, M., Aalto, T., Guina, M.
Publication date: 2019

Host publication information

Title of host publication: Silicon Photonics XIV
Publisher: SPIE, IEEE
Editors: Reed, G. T., Knights, A. P.
Article number: 109230E
ISBN (Electronic): 9781510624887

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 10923
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: Coupling losses, Hybrid integration, III-V, Semiconductor optical amplifiers, Silicon-on-insulator

Bibliographical note

jufoid=71479

Source: Scopus
Source ID: 85065404814

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

Dynamics of value in technology inspired value co-creation: Case in homecare value network

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial Engineering and Management, Research group: Cost Management Center
Contributors: Tiitola, V., Korhonen, T., Laine, T., Lyly-Yrjänäinen, J.
Publication date: 2019

Host publication information

Title of host publication: 14th IFKAD 2019 Proceedings : 5-7 June 2019, Matera, Italy
Publisher: IKAM Centro Studi & Ricerche
ISBN (Electronic): 978-88-96687-12-3

Publication series

Name: PROCEEDINGS IFKAD
ISSN (Electronic): 2280-787X

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

Smartphone teleoperation for self-balancing telepresence robots

Self-balancing mobile platforms have recently been adopted in many applications thanks to their light-weight and slim build. However, inherent instability in their behaviour makes both manual and autonomous operation more challenging as compared to traditional self-standing platforms. In this work, we experimentally evaluate three teleoperation user interface approaches to remotely control a self-balancing telepresence platform: 1) touchscreen button user interface, 2) tilt user interface and 3) hybrid touchscreen-tilt user interface. We provide evaluation in quantitative terms based on user trajectories and recorded control data, and qualitative findings from user surveys. Both quantitative and qualitative results support our finding that the hybrid user interface (a speed slider with tilt turn) is a suitable approach for smartphone-based teleoperation of self-balancing telepresence robots. We also introduce a client-server based multi-user telepresence architecture using open source tools.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences
Contributors: Ainasoja, A. E., Pertuz, S., Kämäräinen, J.
Number of pages: 8
Pages: 561-568
Publication date: 2019

Host publication information

Title of host publication: VISIGRAPP 2019 - Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications
Publisher: SCITEPRESS
Editors: Kerren, A., Hurter, C., Braz, J.
ISBN (Electronic): 9789897583544
ASJC Scopus subject areas: Computer Science Applications, Computer Vision and Pattern Recognition, Computer Graphics and Computer-Aided Design
Keywords: Teleoperation, Telepresence, User Interface
Electronic versions: 
Source: Scopus
Source ID: 85068231086

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

Revisiting gray pixel for statistical illumination estimation

We present a statistical color constancy method that relies on novel gray pixel detection and mean shift clustering. The method, called Mean Shifted Grey Pixel – MSGP, is based on the observation: true-gray pixels are aligned towards one single direction. Our solution is compact, easy to compute and requires no training. Experiments on two real-world benchmarks show that the proposed approach outperforms state-of-the-art methods in the camera-agnostic scenario. In the setting where the camera is known, MSGP outperforms all statistical methods.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences, Czech Technical University in Prague, Intel Finland
Contributors: Qian, Y., Pertuz, S., Nikkanen, J., Kämäräinen, J., Matas, J.
Number of pages: 11
Pages: 36-46
Publication date: 2019

Host publication information

Title of host publication: VISIGRAPP 2019 - Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications
Publisher: SCITEPRESS
Editors: Kerren, A., Hurter, C., Braz, J.
ISBN (Electronic): 9789897583544
ASJC Scopus subject areas: Computer Science Applications, Computer Vision and Pattern Recognition, Computer Graphics and Computer-Aided Design
Keywords: Color Constancy, Gray Pixel, Illumination Estimation
Electronic versions: 
Source: Scopus
Source ID: 85068208950

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

Benchmarking of several disparity estimation algorithms for light field processing

A number of high-quality depth imaged-based rendering (DIBR) pipelines have been developed to reconstruct a 3D scene from several images taken from known camera viewpoints. Due to the specific limitations of each technique, their output is prone to artifacts. Therefore, the quality cannot be ensured. To improve the quality of the most critical and challenging image areas, an exhaustive comparison is required. In this paper, we consider three questions of benchmarking the quality performance of eight DIBR techniques on light fields: First, how does the density of original input views affect the quality of the rendered novel views? Second, how does disparity range between adjacent input views impact the quality? Third, how does each technique behave for different object properties? We compared and evaluated the results visually as well as quantitatively (PSNR, SSIM, AD, and VDP2). The results show some techniques outperform others in different disparity ranges. The results also indicate using more views not necessarily results in visually higher quality for all critical image areas. Finally, we have shown a comparison for different scene's complexity such as non-Lambertian objects.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences, Moving Picture Technologies
Contributors: Zakeri, F. S., Bätz, M., Jaschke, T., Keinert, J., Chuchvara, A.
Publication date: 2019

Host publication information

Title of host publication: Fourteenth International Conference on Quality Control by Artificial Vision
Publisher: SPIE, IEEE
Editors: Bazeille, S., Verrier, N., Cudel, C.
Article number: 111721C
ISBN (Electronic): 9781510630536

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 11172
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: Depth image-based rendering, Disparity estimation, Quality evaluation

Bibliographical note

jufoid=71479

Source: Scopus
Source ID: 85070208910

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

Action and power efficiency in self-organization: The case for growth efficiency as a cellular objective in escherichia coli

Complex systems of different nature self-organize using common mechanisms. One of those is increase of their efficiency. The level of organization of complex systems of different nature can be measured as increased efficiency of the product of time and energy for an event, which is the amount of physical action consumed by it. Here we apply a method developed in physics to study the efficiency of biological systems. The identification of cellular objectives is one of the central topics in the research of microbial metabolic networks. In particular, the information about a cellular objective is needed in flux balance analysis which is a commonly used constrained-based metabolic network analysis method for the prediction of cellular phenotypes. The cellular objective may vary depending on the organism and its growth conditions. It is probable that nutritionally scarce conditions are very common in the nature, and, in order to survive in those conditions, cells exhibit various highly efficient nutrient-processing systems like enzymes. In this study, we explore the efficiency of a metabolic network in transformation of substrates to new biomass, and we introduce a new objective function simulating growth efficiency. We are searching for general principles of self-organization across systems of different nature. The objective of increasing efficiency of physical action has been identified previously as driving systems toward higher levels of self-organization. The flow agents in those networks are driven toward their natural state of motion, which is governed by the principle of least action in physics. We connect this to a power efficiency principle. Systems structure themselves in a way to decrease the average amount of action or power per one event in the system. In this particular example, action efficiency is examined in the case of growth efficiency of E. coli. We derive the expression for growth efficiency as a special case of action (power) efficiency to justify it through first principles in physics. Growth efficiency as a cellular objective of E. coli coincides with previous research on complex systems and is justified by first principles in physics. It is expected and confirmed outcome of this work. We examined the properties of growth efficiency using a metabolic model for Escherichia coli. We found that the maximal growth efficiency is obtained at a finite nutrient uptake rate. The rate is substrate dependent and it typically does not exceed 20 mmol/h/gDW. We further examined whether the maximal growth efficiency could serve as a cellular objective function in metabolic network analysis and found that cellular growth in batch cultivation can be predicted reasonably well under this assumption. The fit to experimental data was found slightly better than with the commonly used objective function of maximal growth rate. Based on our results, we suggest that the maximal growth efficiency can be considered a plausible optimization criterion in metabolic modeling for E. coli. In the future, it would be interesting to study growth efficiency as an objective also in other cellular systems and under different cultivation conditions.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: BioMediTech, Wireless Innovation Laboratory at Worcester Polytechnic Institute, Assumption College, Tufts University, Complex Systems Center, University of Vermont
Contributors: Georgiev, G. Y., Aho, T., Kesseli, J., Yli-Harja, O., Kauffman, S. A.
Number of pages: 16
Pages: 229-244
Publication date: 2019

Host publication information

Title of host publication: Evolution, Development and Complexity - Multiscale Evolutionary Models of Complex Adaptive Systems
Publisher: Springer
Editors: Flores Martinez, C. L., Georgiev, G. Y., Smart, J. M., Price, M. E.
ISBN (Print): 9783030000745

Publication series

Name: Springer Proceedings in Complexity
ISSN (Print): 2213-8684
ISSN (Electronic): 2213-8692
ASJC Scopus subject areas: Applied Mathematics, Modelling and Simulation, Computer Science Applications
Keywords: Action efficiency, Constraint-based modeling, Metabolism, Microorganism, Principle of least action

Bibliographical note

jufoid=84878

Source: Scopus
Source ID: 85071889407

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

Revisiting Social Media Tie Strength in the Era of Data Access Restrictions

The strength of social ties has an impact on how information is transferred and processed in a social network. Many studies have used social media data to evaluate tie strength. However, many of these studies were done at a time when social media data could be accessed legally without using the social media platform API. In the past few years, there have been significant changes in the data access policies of these platforms, which has led to a considerable reduction in the possibilities of using social media data for tie strength evaluation. The paper aims to study the impact of the data access policy changes of major social media platforms on the existing social media based tie strength models. The findings of this study show that the existing social media based tie strength models can no longer be utilized in their current form. Our study suggests that there is either a need to modify the existing social media based tie strength models or to develop new social media based tie strength models that reflect the recent changes in the data access policies.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Information and Knowledge Management, Copenhagen Business School
Contributors: Gupta, J., Kärkkäinen, H., Torro, O., Mukkamala, R. R.
Number of pages: 8
Pages: 187-194
Publication date: 2019

Host publication information

Title of host publication: Proceedings of the 11th International Conference on Knowledge Management and Information Systems (KMIS 2019)
Publisher: SCITEPRESS
ISBN (Electronic): 978-989-758-382-7
Keywords: Data Access Policy, API, Tie Strength, Social Media, Tie Strength Models, Weak Ties, Strong Ties

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

Farm detection based on deep convolutional neural nets and semi-supervised green texture detection using VIS-NIR satellite image

Farm detection using low resolution satellite images is an important topic in digital agriculture. However, it has not received enough attention compared to high-resolution images. Although high resolution images are more efficient for detection of land cover components, the analysis of low-resolution images are yet important due to the low-resolution repositories of the past satellite images used for timeseries analysis, free availability and economic concerns. The current paper addresses the problem of farm detection using low resolution satellite images. In digital agriculture, farm detection has significant role for key applications such as crop yield monitoring. Two main categories of object detection strategies are studied and compared in this paper; First, a two-step semi-supervised methodology is developed using traditional manual feature extraction and modelling techniques; the developed methodology uses the Normalized Difference Moisture Index (NDMI), Grey Level Co-occurrence Matrix (GLCM), 2-D Discrete Cosine Transform (DCT) and morphological features and Support Vector Machine (SVM) for classifier modelling. In the second strategy, high-level features learnt from the massive filter banks of deep Convolutional Neural Networks (CNNs) are utilised. Transfer learning strategies are employed for pretrained Visual Geometry Group Network (VGG-16) networks. Results show the superiority of the high-level features for classification of farm regions.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Electrical Engineering, Coventry University
Contributors: Sharifzadeh, S., Tata, J., Tan, B.
Number of pages: 9
Pages: 100-108
Publication date: 2019

Host publication information

Title of host publication: DATA 2019 - Proceedings of the 8th International Conference on Data Science, Technology and Applications
Publisher: SCITEPRESS
Editors: Hammoudi, S., Quix, C., Bernardino, J.
ISBN (Electronic): 9789897583773
ASJC Scopus subject areas: Hardware and Architecture, Information Systems, Software, Computer Networks and Communications
Keywords: Classification, Convolutional Neural Nets (CNNs), Digital Agriculture, Satellite Image, Supervised Feature Extraction
Electronic versions: 
Source: Scopus
Source ID: 85072971833

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

Single exposure lensless subpixel phase imaging

Lensless phase-retrieval system with phase modulation of free propagation wavefront is proposed. Contrary to the traditional super-resolution phase-retrieval, the method in this paper requires a single observation only and uses advanced SR-SPAR iterative technique. Successful object imaging relies on modulation of the object wavefront with a random phase-mask, which generates enlarged intensity patterns, allowing us to extract more information than it is possible without such a mask. The achieved high-quality super-resolution phase-imaging is demonstrated by simulation-tests produced with the parameters corresponding to the physical prototype of the considered optical system.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Computing Sciences, Research group: Computational Imaging-CI, Computing Sciences
Contributors: Kocsis, P., Shevkunov, I., Katkovnik, V., Egiazarian, K.
Number of pages: 9
Publication date: 2019

Host publication information

Title of host publication: Digital Optical Technologies 2019
Publisher: SPIE, IEEE
Editors: Kress, B. C., Schelkens, P.
ISBN (Electronic): 9781510628038

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 11062
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: Diffractive optical element, Lensless imaging, Lensless system design, Phase imaging, Phase measurement, Phase retrieval, Sparse representation, Sub-pixel resolution
Source: Scopus
Source ID: 85074197001

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

Business intelligence process model revisited

Today many organizations have come to value knowledge as a production factor. Thus, there is a constant need for getting the information in and sorted. Business intelligence (BI) is a process for systematic acquiring, analyzing, and disseminating data and information from various sources to gain understanding about the business's environment. This is required for supporting decisions for achieving organization's business objectives. Literature has introduced models for planning and executing BI. However, as business environments and technologies evolve in a rapid pace, are the models still applicable? Not all recent issues are taken into consideration in the previous models. BI is considered to be integrated into business processes, so the similar evolution is expected to take place. There are two studies investigating BI instigating this study, but there are still questions to be answered. Literature on different models and findings of these studies were combined to form a vision to better match reality. Various issues like users' active involvement, real-time analysis and presentation, and social media resources were brought up. Practitioners can use the approach to assess their current state of BI activities or planning the organization of BI program.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Information and Knowledge Management
Contributors: Hellsten, P., Myllärniemi, J.
Number of pages: 8
Pages: 341-348
Publication date: 2019

Host publication information

Title of host publication: IC3K 2019 - Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management
Publisher: SCITEPRESS
Editors: Bernardino, J., Salgado, A., Filipe, J.
ISBN (Electronic): 9789897583827

Publication series

Name: IC3K 2019 - Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management
Volume: 3
ASJC Scopus subject areas: Software
Keywords: Business Intelligence, Business Intelligence Process Model, Decision-Making, Organizational Development
Source: Scopus
Source ID: 85074178202

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

Challenges in developing data-based value creation

Understanding data-based value creation helps organizations to enhance its decision-making and to renew their business operations. However, organizations aiming to use modern data analytics face several severe challenges that are not usually so evident or visible beforehand. In this paper we study a Finnish manufacturing company's data empowerment and information and knowledge management practices in order to identify the potential challenges related to modern data-based value creation within industrial context. The empirical data is consisted of group discussions, relevant data sets acquired from the case company's information systems, and lastly, 12 thematic interviews of the key actors in the company in relation to service development. The study provides valuable insights for managing service development and decision-making and creates understanding on data-based value creation. Achieved understanding provides meaningful knowledge for organizations utilizing or having plans to utilize, for example, data analytic methods in their businesses.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Information and Knowledge Management
Contributors: Myllärniemi, J., Helander, N., Pekkola, S.
Number of pages: 7
Pages: 370-376
Publication date: 2019

Host publication information

Title of host publication: IC3K 2019 - Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management
Publisher: SCITEPRESS
Editors: Bernardino, J., Salgado, A., Filipe, J.
ISBN (Electronic): 9789897583827

Publication series

Name: IC3K 2019 - Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management
Volume: 3
ASJC Scopus subject areas: Software
Keywords: Case Study, Data-based Value Creation, Information Management Process, Knowledge Management
Source: Scopus
Source ID: 85074145799

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

Co-creating digital services for citizens: Activity theory analysis

Smart city development relies heavily on creation of digital services that are available for the citizens and for the city authorities. At best, these services are co-created by the authorities, citizens and the digital solution supplier companies. Digital service co-creation is, however, a complex process and includes several contradictions due to presence of several stakeholders. In this paper, we present a case study of smart city initiated digital service co-creation process through the analytical lenses of activity theory.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Information and Knowledge Management, HAMK Design Factory, HAMK University of Applied Sciences, HAMK Smart Research Unit
Contributors: Jussila, J., Kukkamäki, J., Helander, N.
Number of pages: 6
Pages: 285-290
Publication date: 2019

Host publication information

Title of host publication: IC3K 2019 - Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management
Publisher: SCITEPRESS
Editors: Bernardino, J., Salgado, A., Filipe, J.
ISBN (Electronic): 9789897583827

Publication series

Name: IC3K 2019 - Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management
Volume: 3
ASJC Scopus subject areas: Software
Keywords: Activity Theory, Co-creation, Digital Service, Empirical Study

Bibliographical note

EXT="Jussila, Jari"

Source: Scopus
Source ID: 85074137289

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

Performance Enhancement Of Optimized Link State Routing Protocol For Health Care Applications In Wireless Body Area Networks

Wireless Body Area Networks (WBAN) refers to the network of wearable sensor devices on a human body. The data gathered from the devices are sent to the server to take some action during an emergency. The collected data has to be successfully routed to reach the destination for an health care applications in WBAN. Hence selecting the routing protocol plays an important role in WBAN. Several researchers have proposed many routing protocols for WBAN. In this work, a novel proactive routing protocol called Energy Aware Power Save Mode Link State is proposed that modifies the existing Optimized Link State Routing protocol. The mathematical model is defined to select the best multi point relay node in a network that considers the power save mode state. The experiment is conducted using network simulator NS-3 and the result shows the substantial network performance metrics improvement in the proposed model compared to the existing.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Electronics and Communications Engineering
Contributors: Chetan Kumar, V., Shiva Prakash, S. P., Balandin, S.
Number of pages: 9
Pages: 195-203
Publication date: Nov 2018

Host publication information

Title of host publication: 2018 23rd Conference of Open Innovations Association (FRUCT)
Publisher: IEEE
ISBN (Print): 978-1-5386-6943-3
ISBN (Electronic): 978-9-5268-6536-2
Keywords: Body area networks, Routing protocols, Wireless communication, Peer-to-peer computing, Quality of service, Routing
Source: Bibtex
Source ID: urn:c178e5ef1e338cad17f7c536b89f7cb3

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

The Effects of Product Line Length on Firm Performance

What products to offer represents one of the most important strategic choices a firm has to make in order to survive in competitive environments. Decisions about the length and breadth of a firm's product line are difficult but vital to its success. Despite this, the performance effects of product line length are a topic of continuing discussion in the academia. There are also multiple ways to define both product line length and breadth, further hindering the analysis and comparison of the results. This study defines both product line length and breadth, and distinguishes them as separate dimensions of a firm's product portfolio. Additionally, the relationship between product line length and firm performance is analyzed through customer evaluations. The study is set in the digital camera industry, focusing on the new product introductions into the compact product category during 2000–2014. Our results offer indication that there exists an inverted U-shaped relationship between product line length and firm performance.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Innovation and Technology Research
Contributors: Kirjavainen, J., Mäkinen, S., Sommarberg, M.
Number of pages: 5
Publication date: 8 Oct 2018

Host publication information

Title of host publication: 2018 Portland International Conference on Management of Engineering and Technology (PICMET)
Publisher: IEEE
ISBN (Electronic): 978-1-890843-37-3
Keywords: Digital cameras , Industries , Length measurement , Lenses , Time measurement , Mirrors

Bibliographical note

jufoid=9093

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

Social capital characteristics in RD project networks

Network research has multiple approaches that offer knowledge related to multiple network types. This article identifies and discusses social capital characteristics in the context of government-funded RD project networks. Previous literature on this context has typically focused on collaboration between universities and firms while our interest is solely on interfirm relationships. Secondly, the previous literature on interfirm collaboration concerns typically other types of networks such as strategic alliances. We argue, that to understand the dynamics of inter firm collaboration in RD project networks, the research needs to be conducted in coherent environment. Data for this qualitative research was collected by interviewing 18 firm representatives who had experience on participating government-funded RD projects. We recognized social capital characteristics in RD projects and organized these findings under structural, cognitive and relational dimensions of social capital. Results indicate that project networks' social capital characteristics differ in many parts from strategic alliances and thus support our argument. The results can be exploited by project coordinators, innovation officers and project network members to facilitate the interfirm collaboration in RD project networks.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Mechanical Engineering and Industrial Systems, Research area: Manufacturing and Automation
Contributors: Majuri, M., Lanz, M.
Publication date: 4 Oct 2018

Host publication information

Title of host publication: 2018 Portland International Conference on Management of Engineering and Technology (PICMET)
Publisher: IEEE
Article number: 8481775
ISBN (Electronic): 9781890843373
ASJC Scopus subject areas: Strategy and Management, Communication, Engineering (miscellaneous), Management of Technology and Innovation, Organizational Behavior and Human Resource Management, Computer Networks and Communications, Decision Sciences (miscellaneous)

Bibliographical note

jufoid=9093

Source: Scopus
Source ID: 85056486979

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

Technopreneurial Characteristics Rising from the Ashes of Creative Destruction

This paper uses the grounded theory building method to investigate the differences and similarities in the evolutionary paths of three entrepreneurial ventures. Theory-based reasoning was used to select cases representing different technopreneurial business models, namely product, expert service, and integrated product-service business models. Our cases emerged from a disrupted global technology corporation and they represent the economic activity emerging from classical creative destruction. We investigate the evolutionary paths of these ventures from their start-up by employing the resource-based view (RBV) approach to determine the critical change points and watershed events that guide the path of the cases. With these analyses, we are able to differentiate the performance differentials and evolutionary trajectories of the cases. The cases suggest that while the strength of the original path is strong it is possible to change the course despite path dependencies. We outline the mechanisms that facilitated these transitions (e.g., finding a suitable equity fund as a catalyst to make the change). Hence, we find that entrepreneurial ventures are not as path dependent as previous studies suggest; rather, there is managerial discretion to change the evolutionary trajectories. Our study suggests that the capabilities acquired over a long period of time in a global technology corporation contribute to the ability to change the path. We discuss the theoretical and practical implications of the critical decision points during the evolutionary trajectories of ventures.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Innovation and Technology Research
Contributors: Sommarberg, M., Mäkinen, S.
Number of pages: 10
Pages: 1-10
Publication date: 1 Oct 2018

Host publication information

Title of host publication: Proceedings in 2018 Portland International Conference in Management and Engineering (PICMET) : (PICMET) 19-23 August 2018
Publisher: IEEE
ISBN (Electronic): 978-1-890843-37-3

Bibliographical note

jufoid=9093

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

Analysis of User Exploration Patterns during Scene Cuts in Omnidirectional Videos

Omnidirectional video can be comprised of several scenes joined together. A scene in a video can change within the same semantic content due to switching to a different camera position (e.g., in a multi-camera sport event), referred to as intra-scene transition; in other situations, a scene in a video can change between different semantic content, referred to as inter-scene transition (e.g., a scene cut from a movie). — In this paper an attempt is made to 1) find the user exploration behavior in terms of the exploration range, angular speed and acceleration metrics; 2) Investigate whether there is any exploration behavioral change in the watching patterns between intra- and inter-scene transitions. — We find that there is an increase in the exploratory behavior for all the above-mentioned metrics, and show that there is a delay (reaction time) between the scene transition and the start of the exploration. Finally, we also show that the exploratory behavior is higher in inter-scene transitions compared to intra-scene transitions.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Signal Processing, Research group: Multimedia Research Group - MRG, Nokia Technologies
Contributors: Monakhov, D., Naik, D., Curcio, I. D. D., Toukomaa, H.
Number of pages: 20
Publication date: Oct 2018

Host publication information

Title of host publication: SMPTE 2018
Publisher: SMPTE
ISBN (Print): 978-1-61482-960-7
Keywords: Omnidirectional video, 360 Degrees video, Exploration range, Scene transitions, Watching patterns, Scene cuts, Viewport dependent streaming
Source: Bibtex
Source ID: urn:c98a31d3ee60d03894118df511ce8868

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

Long-term monitoring of acute wound healing from beneath the primary wound dressings

Our group has developed a quasimonopolar bioimpedance measurement-based method and a measurement system to determine the status of wound healing. So far, we have shown that the bioimpedance method is a prospective tool for assessment of wound healing by monitoring the healing of both acute wounds and venous ulcers at discrete time points. The objective of this study was to demonstrate that the method is capable for monitoring wound healing also long-term while the wound is covered by the primary dressings. For this purpose we arranged a follow-up study of a single acute wound. The purpose-built multi-electrode dressing was applied on the wound and left under the primary dressings until the complete re-epithelization was achieved. The bioimpedance of the wound and surrounding skin area was measured regularly during a 120 hours study. Based on the results, we can confirm that the method applies for long-term monitoring of acute wound healing without necessity to remove the primary dressings.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Physiological Measurement Systems and Methods Group, BioMediTech, CutoSense Ltd.
Contributors: Kekonen, A., Bergelin, M., Eriksson, J., Vesa, M., Johansson, M., Viik, J.
Number of pages: 4
Publication date: Oct 2018

Host publication information

Title of host publication: 2018 16th Biennial Baltic Electronics Conference (BEC)
Publisher: IEEE
ISBN (Print): 978-1-5386-7313-3
ISBN (Electronic): 978-1-5386-7312-6
Keywords: Electrodes, Wounds, Impedance, Skin, Biomedical measurement, Monitoring, Bioimpedance, bioimpedance beneath dressing, healing, longterm wound monitoring, multi-electrode
Source: Bibtex
Source ID: urn:054660b869151d1efd2f9613e80b4431

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

Glove-integrated slotted patch antenna for wearable UHF RFID reader

We present a glove-integrated slotted patch antenna for a wearable Ultra High Frequency Radio Identification Technology (UHF RFID) reader operating at 866
MHz. We tested the prototype antenna made of copper foil adhered on low-permittivity Ethylene Propylene Diene Monomer (EPDM) foam material having the thickness of 4 mm. To characterize the antenna, we tested it wirelessly in
communication with a common dipole type RFID tag to estimate its realized gain, radiation pattern and maximum tag read range it provides. We also analyzed the effects of variable separation between the antenna and the body to confirm stable operation required by the application. The results showed that the antenna feasible for the work glove applications providing the read range
up to 360 cm with the reader’s output power of 28.4 dBm.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Wireless Identification and Sensing Systems Research Group, BioMediTech
Contributors: Ahmed, S., Musfequr Rehman, S. M., Ukkonen, L., Björninen, T.
Number of pages: 4
Publication date: 26 Sep 2018

Host publication information

Title of host publication: 2018 IEEE International Conference on RFID Technology & Application (RFID-TA)
Publisher: IEEE
ISBN (Electronic): 978-1-5386-5057-8

Bibliographical note

INT=TUT-BMT,"Musfequr Rehman, S. M."

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

RF energy harvesting system with RFID-enabled charge storage monitoring

Radio frequency (RF) energy scavenging is a compelling approach to energize the low-power wireless devices. We present an energy harvesting system consists of a low-power RF switch circuitry and a passive UHF RFID tag. When the voltage at the storage capacitor terminals exceeds 0.58 V, RF switch connects the UHF RFID microchip to a dipole-type tag antenna. This way, an RFID reader can detect
the charge storage level wirelessly with minimal power consumption at the harvester. In this paper, we detail the development of the system and present results from both simulations and measurement. Overall, we were able to achieve 0.58 V at the storage capacitor and detect the storage level
indicator tag at the distance of 5.1 m in an experiment where regular 8.7 dBi patch antennas were connected to the harvester input and output of an RFID reader emitting 2.5 W EIRP.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Wireless Identification and Sensing Systems Research Group, Research group: Wireless Identification and Sensing Systems Research Group
Contributors: Pournoori, N., Khan, W., Ukkonen, L., Björninen, T.
Number of pages: 4
Publication date: 26 Sep 2018

Host publication information

Title of host publication: 2018 IEEE International Conference on RFID Technology & Application (RFID-TA)
Publisher: IEEE
ISBN (Electronic): 978-1-5386-5057-8

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

Referenced backscattering compression level indicator based on passive UHF RFID tags

We establish a passive UHF RFID tag as a sensor with a referenced readout to compression. We introduce the sensor tag design, which is based on a two-part split ring resonator antenna, and present the compression sensor platform with a reference tag. We analyze the achieved wireless measurement results and evaluate the performance of the compression sensing platform. Based on these initial measurements, passive RFID-based sensors could provide a maintenance-free wirelessly readable option for compression sensing, for example for structural health monitoring.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Wireless Identification and Sensing Systems Research Group, BioMediTech
Contributors: Qureshi, S., Björninen, T., Virkki, J.
Number of pages: 3
Publication date: 26 Sep 2018

Host publication information

Title of host publication:  2018 IEEE International Conference on RFID Technology & Application (RFID-TA)
Publisher: IEEE
ISBN (Electronic): 978-1-5386-5057-8

Bibliographical note

JUFOID=72031

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

Constrained Long-Horizon Direct Model Predictive Control for Synchronous Reluctance Motor Drives

A finite control set model predictive control strategy for the control of the stator currents of a synchronous reluctance motor driven by a three-level neutral point clamped inverter is presented in this paper. The presented algorithm minimizes the stator current distortions while operating the drive system at switching frequencies of a few hundred Hertz. Moreover, the power electronic converter is protected by overcurrents and/or overvoltages owing to a hard constraint imposed on the stator currents. To efficiently solve the underlying integer nonlinear optimization problem a sphere decoding algorithm serves as optimizer. To this end, a numerical calculation of the unconstrained solution of the optimization problem is proposed, along with modifications in the algorithm proposed in [1] so as to meet the above-mentioned control objectives. Simulation results show the effectiveness of the proposed control algorithm.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Electrical Energy Engineering, Research group: Power electronics, Universita degli Studi di Padova, Italy, Technische Universitat Munchen
Contributors: Ortombina, L., Liegmann, E., Karamanakos, P., Tinazzi, F., Zigliotto, M., Kennel, R.
Number of pages: 8
Publication date: 10 Sep 2018

Host publication information

Title of host publication: 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
Publisher: IEEE
Article number: 8460173
ISBN (Print): 9781538655412
ASJC Scopus subject areas: Modelling and Simulation, Energy Engineering and Power Technology, Electrical and Electronic Engineering, Control and Optimization

Bibliographical note

JUFOID=79370

Source: Scopus
Source ID: 85054503298

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

2D Video Coding of Volumetric Video Data

Due to the increased popularity of augmented and virtual reality experiences, the interest in representing the real world in an immersive fashion has never been higher. Distributing such representations enables users all over the world to freely navigate in never seen before media experiences. Unfortunately, such representations require a large amount of data, not feasible for transmission on today's networks. Thus, efficient compression technologies are in high demand. This paper proposes an approach to compress 3D video data utilizing 2D video coding technology. The proposed solution was developed to address the needs of 'tele-immersive' applications, such as virtual (VR), augmented (AR) or mixed (MR) reality with Six Degrees of Freedom (6DoF) capabilities. Volumetric video data is projected on 2D image planes and compressed using standard 2D video coding solutions. A key benefit of this approach is its compatibility with readily available 2D video coding infrastructure. Furthermore, objective and subjective evaluation shows significant improvement in coding efficiency over reference technology.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Signal Processing, Nokia Technologies
Contributors: Schwarz, S., Hannuksela, M. M., Fakour-Sevom, V., Sheikhi-Pour, N.
Number of pages: 5
Pages: 61-65
Publication date: 5 Sep 2018

Host publication information

Title of host publication: 2018 Picture Coding Symposium, PCS 2018 - Proceedings
Publisher: IEEE
Article number: 8456265
ISBN (Print): 9781538641606
ASJC Scopus subject areas: Signal Processing, Media Technology

Bibliographical note

INT=sgn,"Sheikhi-Pour, Nahid"

Source: Scopus
Source ID: 85053915056

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

Web User Interface Implementation Technologies: An Underview

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Pervasive Computing, Research area: Software engineering, University of Lugano (USI), Università della Svizzera Italiana, Nokia Technologies, University of Helsinki
Contributors: Taivalsaari, A., Mikkonen, T., Systä, K., Pautasso, C.
Number of pages: 10
Pages: 127-136
Publication date: 5 Sep 2018

Host publication information

Title of host publication: 14th International Conference on Web Information Systems and Technologies
Publisher: SCITEPRESS
ISBN (Print): 978-989-758-324-7

Bibliographical note

EXT="Taivalsaari, Antero"
EXT="Mikkonen, Tommi"

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

Multi-site delamination analysis using virtual crack closure technique for a composite aircraft wing flap

In this study, we investigate the application of virtual crack closure technique (VCCT) for a multi-site delamination damage in the F-18 Hornet fighter aircraft’s wing flap. The work focuses on the interaction between multiple delamination sites at different ply interfaces. The effects of numerical analysis parameters, such as energy release rate tolerance, on the criticality of the delamination and on the delamination growth are also studied.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Materials Science, Research group: Plastics and Elastomer Technology, Aalto University
Contributors: Jokinen, J., Kanerva, M., Saarela, O.
Publication date: Sep 2018

Host publication information

Title of host publication: 31st Congress of the International Council of the Aeronautical Sciences (Proceedings) : Belo Horizonte, Brazil September 9-14, 2018
Publisher: ICAS Press
ISBN (Electronic): 978-3-932182-88-4
Keywords: Multi-site damage, Finite element analysis, Fighter aircraft, Flap

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

Fabrication and Practical Evaluation of Glove-integrated Passive UHF RFID Tags

Passive RFID-based technology is a convincing approach to achieve versatile energy- and cost-efficient wireless platforms for future wearable applications. In this paper, we present passive UHF RFID tags integrated into normal work gloves for wearable RFID applications. We introduce embroidery as a new efficient antenna fabrication method for glove-integrated tags as well as establish reference glove-tag antennas from electro-textiles and copper tape. The performance of the three types of glove-tags is evaluated on a male test subject in an anechoic room and in an office environment. Based on the wireless measurement results, the read ranges of the embroidered glove-tags were around 1 meter in an anechoic chamber and in an office, when measured near the human body. These results meet the requirements of many practical applications of glove-tags, although the read ranges are shorter than those of the electro-textile and copper tape tags that showed read ranges of 2-2.5 meters. Finally, the developed glove-tags were successfully tested in actual use situations for identification and access control. These results are very promising, especially considering the cost effectiveness of embroidered tag antennas and the easiness of their integration into different types of gloves.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Wireless Identification and Sensing Systems Research Group
Contributors: Chen, X., He, H., Ukkonen, L., Virkki, J., Xu, J., Wang, T., Cheng, L.
Number of pages: 5
Publication date: Sep 2018

Host publication information

Title of host publication: 2018 IEEE International Conference on RFID Technology Application (RFID-TA)
Publisher: IEEE
ISBN (Print): 978-1-5386-5058-5
ISBN (Electronic): 978-1-5386-5057-8
Keywords: anechoic chambers (electromagnetic), radiofrequency identification, textile products, UHF antennas, wearable antennas, passive RFID-based technology, cost-efficient wireless platforms, wearable RFID applications, glove-integrated tags, electro-textile, embroidered glove-tags, practical applications, copper tape tags, embroidered tag antennas, wireless measurement, glove-integrated passive UHF RFID tags, antenna fabrication method, anechoic chamber, Antennas, Copper, Antenna measurements, Meters, Yarn, Frequency measurement, Radiofrequency identification, RFID, wearable antenna, glove-tag, embroidery electronics, electro-textile antenna

Bibliographical note

JUFOID=72031

Source: Bibtex
Source ID: urn:7ff8bf18c5235d84d462120f1392fdd5

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

Comparison of food frequency questionnaire data and shopping records for the assessment of food intake

Questionnaires are typically used for collecting information
describing health behavior in areas such as diet, physical activity and sleep.
Utilization of the digital footprint, formed from an individual’s unique digital
activities, forms a potential new opportunity for describing lifestyle and
health-related behavior. We studied if passively collected shopping data
describes food intake when compared to food frequency questionnaire (FFQ)
data providing information on food and beverage consumption. For 4 out of 21
food groups the results were comparable. Shopping information from only one
department store chain gives only a partial picture of the food consumption and
differing family sizes add noise to the estimate. If the whole digital footprint
would be available, including detailed product-level shopping information from
all stores and restaurants, the food intake could probably be estimated more
accurately and applied e.g. in personalized coaching.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Faculty of Biomedical Sciences and Engineering, Faculty of Biomedical Sciences and Engineering, Tampere University of Technology, Institute for Molecular Medicine, FIMM, HiLIFE, University of Helsinki
Contributors: Kallonen, A., Nieminen, H., Das, S., Sallinen, R.
Pages: 25-30
Publication date: 27 Aug 2018

Host publication information

Title of host publication: Proceedings of Seventh International Conference on Well-Being in the Information Society: Fighting Inequalities (WIS 2018)
ISBN (Electronic): 978-952-12-3727-0

Publication series

Name: TUCS Lecture Notes
Volume: 28
ISSN (Electronic): 1797-8831
ASJC Scopus subject areas: Molecular Medicine
Keywords: Food intake assessment, shopping data, food frequency questionnaire, digital footprint

Bibliographical note

INT=TUT-BMT,"Das, Soumya"

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

Model-based cosimulation for industrial wireless networks

Wireless communications technology has the potential to provide major benefits in lowering the cost and increasing the efficiency of factory automation (FA) systems. However, design of FA systems that employ wireless networks involves stringent constraints on real-time performance and reliability, and requires the assessment of and experimentation with complex interactions among process control, factory topology construction (layout and connectivity of subsystems, such as machines, rails, etc.), and wireless communication. In this paper, we introduce a novel simulation framework to support such assessment and experimentation in the design of next-generation FA systems. Our simulation framework employs model-based design principles to enhance design reliability, and enable systematic and efficient integration of control, topology, and network modeling aspects. We demonstrate the utility of our framework through a case study that involves topology design and scalability analysis for a large class of FA systems. Our results demonstrate the ability of the proposed framework to provide insights on complex design trade-offs, while the underlying model-based features enhance efficient and reliable system-level integration.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Pervasive Computing, University of Maryland, National Institute of Standards and Technology, Department of Electrical and Computer Engineering
Contributors: Geng, J., Li, H., Liu, Y., Liu, Y., Kashef, M., Candell, R., Bhattacharyya, S. S.
Number of pages: 10
Pages: 1-10
Publication date: 3 Jul 2018

Host publication information

Title of host publication: WFCS 2018 - 2018 14th IEEE International Workshop on Factory Communication Systems
Publisher: IEEE
ISBN (Electronic): 9781538610664
ASJC Scopus subject areas: Electrical and Electronic Engineering, Industrial and Manufacturing Engineering

Bibliographical note

jufoid=83653

Source: Scopus
Source ID: 85050017916

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

Improved modelling of electric loads for enabling demand response by applying physical and data-driven models: Project Response

Accurate load and response forecasts are a critical enabler for high demand response penetrations and optimization of responses and market actions. Project RESPONSE studies and develops methods to improve the forecasts. Its objectives are to improve 1) load and response forecast and optimization models based on both data-driven and physical modelling, and their hybrid models, 2) utilization of various data sources such as smart metering data, weather data, measurements from substations etc., and 3) performance criteria of load forecasting. The project applies, develops, compares, and integrates various modelling approaches including partly physical models, machine learning, modern load profiling, autoregressive models, and Kalman-filtering. It also applies non-linear constrained optimization to load responses. This paper gives an overview of the project and the results achieved so far.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Electrical Energy Engineering, Research group: Power systems, Research area: Information Systems in Automation, Automation and Hydraulic Engineering, VTT Technical Research Centre of Finland, University of Eastern Finland
Contributors: Koponen, P., Hanninen, S., Mutanen, A., Koskela, J., Rautiainen, A., Järventausta, P., Niska, H., Kolehmainen, M., Koivisto, H.
Number of pages: 6
Pages: 1-6
Publication date: 27 Jun 2018

Host publication information

Title of host publication: 2018 IEEE International Energy Conference, ENERGYCON 2018
Publisher: IEEE
ISBN (Electronic): 9781538636695
ASJC Scopus subject areas: Artificial Intelligence, Energy Engineering and Power Technology, Control and Optimization
Keywords: Active demand, Forecasting, Hybrid models, Machine learning, Optimization, Physically based models
Electronic versions: 
Source: Scopus
Source ID: 85050244199

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

Moving toward integrated solutions in project-based firms: Changes in sales practices

Effective solution sales is one prerequisite for successful solution business in project-based firms. Little is known about how sales practices should be developed, particularly at the operational level. The purpose of this study is to identify changes in sales practices when firms move towards integrated solutions. A qualitative case study was conducted in two project-based manufacturing firms, using data from interviews with sales and service managers. Five main change categories were identified including changes in the organizational structure, complexity of offering, customer-orientation, sales network and sales routines. The study shows that sales practices should change at all stages of project marketing from detecting the potential projects to finalizing the contract. The study proposes a more extended role for sales and service personnel during project marketing and the project life cycle. The identified changes help project-based firms to develop their sales models and to promote their solution business.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Research on Operations Projects and Services
Contributors: Momeni, K., Martinsuo, M.
Number of pages: 30
Publication date: 21 Jun 2018

Host publication information

Title of host publication: Proceedings of EURAM18 European Academy of Management conference 2018
Publisher: European Academy of Management, EURAM
ISBN (Electronic): 978-2-9602195-0-0

Publication series

Name: EURAM conference
ISSN (Print): 2466-7498
Keywords: Project business, solution selling, project sales, project-based firm

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

Systematic literature review on customer emotions in social media

Customers are human beings who express their emotions openly on social media platforms. There is a wealth of social media data that companies can make use of to improve their business decision making and tailor their marketing strategies. In order to benefit from this, organizations need to apply computational methods, which can save time and effort rather than applying traditional consumer research approaches, such as surveys or interviews. The purpose of this study is to investigate existing computational studies on detecting consumer emotions from social media data. We conducted a systematic literature review on articles published in ScienceDirect, IEEE Explore, ACM Digital Library, and Emerald Insight from the period 2009-2017. The aim was to discover how social media data was extracted, how large datasets were used in detecting emotions, the type of computational methods used, and the accuracy of the results obtained from the existing studies. Most of the studies were focused on sentiment analysis and different machine learning algorithms. The computational methods were applied in business decision making and marketing functions. Practical scenarios included emotion detection in customer reviews and sentiment analysis of retail brands. Based on these studies, we have uncovered situations where the results of the analysis are either sufficiently accurate or supportive for decision making. We provide recommendations for organizations and managers on developing their resources to make use of different computational methods for emotion and sentiment detection. Finally, we present the limitations of these methods and provide recommendations for aligning future research studies toward big social data analytics on customer emotions.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Business Ecosystems, Networks and Innovations, Tampere University of Technology, University of Örebro Business School, University of Jyväskylä
Contributors: Madhala, P., Jussila, J., Aramo-Immonen, H., Suominen, A.
Number of pages: 10
Publication date: 21 Jun 2018

Host publication information

Title of host publication: ECSM - Proceedings of the 5th European Conference on Social Media
Place of publication: Limerick, Ireland
Editors: Cunnane, V., Corcoran, N.
ISBN (Print):  978-1-911218-83-8
ISBN (Electronic): 978-1-911218-84-5
Keywords: social media, big data, emotions, consumer behaviour, sentiment analysis
Electronic versions: 

Bibliographical note

INT=ttj,"Madhala, Prashanth"

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

Fabrication and reliability evaluation of passive UHF RFID T-shirts

In this paper, we present textile antennas fabricated for T-shirt RFID applications by cutting from commercially available electro-textile, by sewing with conductive thread, and by 3D printing with stretchable silver ink on a 100 % cotton fabric. The ready tags with attached ICs are coated with a protective stretchable encapsulant. The wireless performance of the T-shirt tags is evaluated initially as well as after seven washing cycles, followed by nine washing-drying cycles in a household washing and drying machines. The initial read ranges of all kinds of tags, when measured on-body, are around 3.5 meters. Based on the reliability testing results, the coating effectively protects the components from cyclic washing and drying.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Faculty of Biomedical Sciences and Engineering, Research group: Wireless Identification and Sensing Systems Research Group, Department of Electronic Engineering, City University of Hong Kong
Contributors: Chen, X., He, H., Ukkonen, L., Virkki, J., Lu, Y., Lam, H.
Number of pages: 4
Pages: 1-4
Publication date: 8 Jun 2018

Host publication information

Title of host publication: 2018 IEEE International Workshop on Antenna Technology, iWAT2018 - Proceedings
Publisher: IEEE
ISBN (Electronic): 9781538618516
ASJC Scopus subject areas: Instrumentation, Computer Networks and Communications, Electronic, Optical and Magnetic Materials
Keywords: 3D Printing, electro-textiles, embroidery, passive UHF RFID, T-shirts, textiles, washing, wearable electronics

Bibliographical note

jufoid=79362

Source: Scopus
Source ID: 85050037887

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

Education on the utilization of secondary materials in earthworks

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Civil Engineering, Aalto University, Aalto University
Contributors: Kuula, P., Leppänen, M., Kolisoja, P., Korkiala-Tanttu, L., Sorvari, J., Gustavsson, H.
Number of pages: 11
Pages: 177-187
Publication date: 6 Jun 2018

Host publication information

Title of host publication: Proceedings of the 10th International Conference on the Environmental and Technical Implications of Construction with Alternative Materials : No Gradle no Grave Circular Economy into practice
Publisher: RIL - Finnish Association of Civil Engineers
Editors: Lahtinen, P., Raasakka, V.
ISBN (Electronic): 978-951-758-631-3

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

Dual-frequency signal processing architecture for robust and precise positioning applications

Availability of new GPS civil signals L2C and L5 along with existed L1C/A signal and Galileo E1/E5/E6 signals has increased the potential ways to generate linear combination of signals to remove ionosphere errors and improve accuracy in carrier integer ambiguity resolution. Conventionally, a linear combination of dual frequency signals has been used to remove first order ionosphere delays incurred in signal propagation path which is a major source of range error. Out of the three civil signals in GPS and Galileo system, L5/E5 signals have advanced signal features such as higher received power, faster chip rate and lower carrier frequency than L1/E1 and L2C/E6 signals. Hence, dual frequency receiver with combination of L1/L5 and E1/E5 signals is more suitable to remove ionosphere delay and get benefit from L5/E5 signal characteristics. However, the major limitation of linear combination of signal observations is an amplification of receiver noise. To get benefit of two frequency signals, a suitable signal processing architecture is needed. By taking advantage of GPS L5/Galileo E5 signal characteristics, a dual frequency signal processing architecture is proposed with an aim to reduce the ionosphere-free signal observation noise and to enhance the L1/E1 signal tracking loop sensitivity. The L1/E1 signal tracking loop sensitivity can be enhanced by Doppler aiding from L5/E5 signal tracking loop. The low noise L5/E5 signal Doppler aid reduces the noise in the L1/E1 signal tracking loop. Moreover, two frequency signals tracked with common Doppler estimate will have common observation errors, which will get cancel in linear combination of observations i.e. ionosphere-free, wide-lane etc. Further, code phase observations can be smoothed (Hatch filter) using carrier phase observations. The carrier phase observations are limited by cycle slip. Hence, we have investigated an optimum combination of divergence-free and ionosphere-free pseudorange smoothing using dual-frequency carrier Doppler observations for GPS L1/L5 and Galileo E1/E5 signals. The cycle slip in carrier phase observations can be neglected in carrier Doppler observations. The proposed signal processing architecture incorporated in GPS L1/L5 and Galileo E1/E5 dual frequency receiver will ensure robust signal tracking and minimum pseudorange errors, suitable to a range of high accuracy standalone and code differential positioning applications. The performance of the proposed dual frequency signal processing architecture is evaluated with GPS L1/L5 signals collected from Block-IIF satellites.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Electronics and Communications Engineering, Faculty of Electronics and Instrument Engineering, Samara National Research University
Contributors: Bolla, P., Lohan, E.
Number of pages: 9
Pages: 72-80
Publication date: 5 Jun 2018

Host publication information

Title of host publication: 2018 IEEE/ION Position, Location and Navigation Symposium, PLANS 2018
Publisher: IEEE
ISBN (Electronic): 9781538616475
ASJC Scopus subject areas: Automotive Engineering, Aerospace Engineering, Control and Optimization
Keywords: Carrier Doppler smoothing, Doppler aiding, Dual-frequency, Hatch filter

Bibliographical note

EXT="Bolla, Padma"
jufoid=72638

Source: Scopus
Source ID: 85048871323

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

Toward Manageable Data Sources

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Research group: Software Engineering and Intelligent Systems, Pervasive Computing
Contributors: Sillberg, P.
Pages: 485-494
Publication date: Jun 2018

Host publication information

Title of host publication: EJC 2018 : Proceedings of the 28th International Conference on Information Modelling and Knowledge Bases
Publisher: Transport and Telecommunication Institute
Editors: Endrjukaite, T., Kangassalo, H., Thalheim, B., Kiyoki, Y.
ISBN (Electronic): 978-9984-818-89-4

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

Industrial customers’ organizational readiness for service innovations: Adopting data-based advanced services

Manufacturing firms that deliver complex products and systems are increasingly offering advanced data-based services to their customers. Customers are not always readily interested or willing to procure advanced services, and manufacturing firms need knowledge on how to promote the customer’s service readiness. The aim in this paper is to develop and propose a framework on customer firms’ organizational readiness for service innovations. We explore the experiences of customers of a manufacturing firm delivering complex systems and related services. The interview-based study reveals that customers use versatile processes for new service adoption, and engage multiple people and use varied criteria when deciding the adoption of data-based new services. Organizational readiness for service innovations appears in terms of change requirements concerning service context, supplier relations, and organizational habits and culture. The findings suggest actions for the manufacturing firms as ways to promote the customers’ readiness for service innovations.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Research on Operations Projects and Services
Contributors: Martinsuo, M., Vaittinen, E.
Number of pages: 17
Publication date: Jun 2018

Host publication information

Title of host publication: Proceedings of the 25th Innovation and Product Development Management Conference
Publisher: European Institute for Advanced Studies in Management, EIASM

Publication series

Name: International Product Development Management Conference
ISSN (Electronic): 1998-7374

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

Requirements from industrial internet for innovations in advanced industrial services

Manufacturing firms are experimenting with the possibilities of the Industrial Internet, while at the same time adding services and service-related business models to their offerings. Previous research is not, yet, clear on how these simultaneous transformations are handled, particularly when firms being to offer more advanced industrial services. The objective in this study is to identify the key expectations and requirements that an industrial system manufacturer faces, when adopting Industrial Internet and innovating advanced industrial services for its business customers. A single case study was carried out in a manufacturing firm offering complex industrial systems and related services to business customers. Seventeen interviews and three workshops were carried out, to collect data. The results show that the manufacturing firms need novel segmentation criteria, to map their customer base and its prospects for advanced services. Four systemic requirements are identified, for the manufacturing firm to benefit from the Industrial Internet in advanced industrial services. As Industrial Internet can enable advanced services that are highly systemic in nature, service innovations require that the business ecosystem is engaged in the development work together with the manufacturing firm.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Research on Operations Projects and Services
Contributors: Martinsuo, M., Laurila, F.
Number of pages: 16
Publication date: Jun 2018

Host publication information

Title of host publication: Proceedings of the 25th Innovation and Product Development Management Conference
Publisher: European Institute for Advanced Studies in Management, EIASM

Publication series

Name: International Product Development Management Conference
ISSN (Electronic): 1998-7374

Bibliographical note

INT=ttj,"Laurila, Fanni"

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

Lifecycle-oriented framing of value at the front end of infrastructure projects

Infrastructure projects are expected to deliver value to their stakeholders long after their completion. Project value is multi-dimensional and subjective and evolves over the project lifecycle. The framing of the expected value by stakeholders is central to the public debate about proposed infrastructure projects and influences the financing decisions, however this framing is inadequately understood. The objective is to develop new knowledge on the ways in which stakeholders frame project lifecycle value at the front end of infrastructure projects. We compare two transport infrastructure projects in a qualitative, document-based study, map their dimensions of value at the project front end, and identify their approaches to lifecycle-oriented framing of value. The results reveal the dominance of financial, social and comparative value in the project front end, and identify four core themes in the lifecycle-oriented framing of value, including uncertainties, timing of cost and benefit realization, project relations, and external sponsorship.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Research on Operations Projects and Services, University of Technology Sydney (UTS)
Contributors: Martinsuo, M., Vuorinen, L., Killen, C., Laiti, M.
Number of pages: 36
Publication date: Jun 2018

Host publication information

Title of host publication: Proceedings of EURAM18 European Academy of Management conference 2018
Publisher: European Academy of Management, EURAM
ISBN (Electronic): 978-2-9602195-0-0

Publication series

Name: EURAM conference
ISSN (Print): 2466-7498

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

Agency relationships in global project business

Project-based firms (PBFs) serving global markets rely on local agents throughout the project life-cycle. In particular, agents are frequently used to support the PBFs efforts in project marketing, project implementation, and in provisioning of services to customers operating the delivered solutions. The purpose of this paper is to analyse principal-agent relationships in global project business from an agency perspective in order to provide further clarity to the their salient characteristics, and to identify mechanisms through which agency problems can be mitigated. Based on our analysis of earlier literature, it appears that PBFs’ principal-agent relationships with local actors during project front-end and operations phases are predominantly explorative in their nature whilst relationships during project implementation can be characterized as exploitative. Respectively, relationships of the former kind are governed by complex combinations of contractual and noncontractual mechanisms, while in relationships of the latter kind, rather simple contractual mechanisms are favoured by PBFs. Our findings imply that PBFs need to consider both the project life-cycle phase, as well as the characteristics and goals of individual agents, when designing mechanisms for governing their agency relationships.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Research on Operations Projects and Services, Research group: Center for Research on Operations Projects and Services
Contributors: Ahola, T., Ståhle, M., Martinsuo, M.
Number of pages: 38
Publication date: Jun 2018

Host publication information

Title of host publication: Proceedings of EURAM18 European Academy of Management conference 2018
Publisher: European Academy of Management, EURAM
ISBN (Electronic): 978-2-9602195-0-0

Publication series

Name: EURAM conference
ISSN (Print): 2466-7498
Keywords: Global project business, agency theory, local agents, project marketing, project implementation, service provisioning

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

Re-use of engineering design rationale in Finnish SME project based industry

This study presents views on barriers of re-use of engineering design rationale. The research data was gathered by interviewing 29 persons who work in 19 different Finnish SME engineering project based companies. The topic was studied on three main levels: due to actions of business management, due to actions of project team and due to individuals own action. From this perspective, six categories of barriers of tacit knowledge re-use were found: Time management, Tools and ocumentation practices, Working methods, Validity of information, Well-being at work and Distinction in competence.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Mechanical Engineering and Industrial Systems, Research area: Design, Development and LCM, Tampere University
Contributors: Ellman, A., Paronen, J., Juuti, T. S., Tiainen, T.
Number of pages: 8
Pages: 1825-1832
Publication date: 24 May 2018

Host publication information

Title of host publication: Proceedigns of the Design 2018 15th International Design Conference
Publisher: The Design Society
ISBN (Electronic): 978-953-7738-59-4
Keywords: design knowledge, design practice, design management
DOIs: 

Bibliographical note

jufoid=84955

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

Ready to sell? Requirements for promoting service selling in a manufacturing firm

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Industrial and Information Management, Research group: Center for Research on Operations Projects and Services
Contributors: Vaittinen, E., Martinsuo, M.
Number of pages: 9
Pages: 26-34
Publication date: May 2018

Host publication information

Title of host publication: Proceedings of the Spring Servitization Conference, DrivingCompetitiveness through Servitization, 14-16 May 2018
Publisher: Aston University
Editors: Bigdeli, A., Frandsen, T., Raja, J., Baines, T.
ISBN (Print): 9781854494481

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

Measurements of impact force excitation on wooden floors

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Civil Engineering, Research group: Metal and Light-wight structures, Materials Science, Research group: Tribology and Machine Elements, Research group: Building Acoustics, Research group: Structural Mechanics
Contributors: Lietzen, J., Miettinen, J., Kylliäinen, M., Pajunen, S.
Number of pages: 6
Pages: 1617-1622
Publication date: May 2018

Host publication information

Title of host publication: Proceedings of the 11th European Congress and Exposition on Noise Control Engineering, Euronoise 2018, May 27-31 2018, Hersonissos, Crete, Greece : Reduce Noise to Improve Life, Crete, May 27-31, 2018
Place of publication: Hersonissos, Crete, Greece
Publisher: European Acoustic Association EAA
Article number: 272.161

Publication series

Name: Proceedings : European Conference on Noise Control
ISSN (Electronic): 2226-5147

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

Finnish Round Robin Test on Airborne Sound Insulation

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Civil Engineering
Contributors: Lietzen, J., Kylliäinen, M.
Number of pages: 6
Pages: 1677-1682
Publication date: May 2018

Host publication information

Title of host publication: Proceedings of the 11th European Congress and Exposition on Noise Control Engineering, Euronoise 2018, May 27-31 2018, Hersonissos, Crete, Greece : Reduce Noise to Improve Life
Place of publication: Hersonissos, Crete, Greece
Publisher: European Acoustic Association EAA
Article number: 282.162

Publication series

Name: European Congress and Exposition on Noise Control Engineering
ISSN (Print): 2226-5147

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

Ultra-large mode area single frequency anisotropic MOPA with double clad Yb-doped tapered fiber

We demonstrates all-fiber master oscillator - power amplifier delivered 70W output power at 1033.33nm with 8 kHz FWHM linewidth without any problems with SBS. The anisotropic ytterbium doped tapered double clad amplifier with 50 μm MFD and polarization extinction ratio about 30 dB is developed as a burst stage. The output radiation demonstrated perfect beam quality (M2=1.03/1.08).

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Ampliconyx Ltd, Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, St. Petersburg State Polytechnical University
Contributors: Noronen, T., Fedotov, A., Rissanen, J., Gumenyuk, R., Butov, O., Chamorovskii, Y., Golant, K., Odnoblyudov, M., Filippov, V.
Number of pages: 6
Publication date: 1 Jan 2018

Host publication information

Title of host publication: Fiber Lasers XV : Technology and Systems
Publisher: SPIE, IEEE
Article number: 105121T
ISBN (Electronic): 9781510615090

Publication series

Name: Proceedings of SPIE
Publisher: SPIE
Volume: 10512
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: active fiber, fiber amplifier, Fiber laser

Bibliographical note

EXT="Noronen, Teppo"
EXT="Fedotov, Andrei"
INT=fot, "Rissanen, Joona"
EXT="Gumenyuk, Regina"
EXT="Filippov, Valery"

Source: Scopus
Source ID: 85045656071

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

Sub-100 fs pulse generation from a Tm,Ho: CALYO laser mode-locked by a GaSb-based SESAM at ~2043 nm

We report on the first sub-100-fs mode-locked Ho3+-laser in the 2-μm spectral range. The disordered co-doped Tm,Ho:CaYAlO4 (Tm,Ho:CALYO) crystal produced pulses as short as 87 fs with 27-mW average output power at 80.45-MHz repetition rate.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Photonics, Max Born Institute, Jiangsu Normal University, Universitat Rovira i Virgili, China Academy of Engineering Physics, ITMO University, Tongji University
Contributors: Zhao, Y., Wang, Y., Zhang, X., Mateos, X., Pan, Z., Loiko, P., Zhou, W., Xu, X., Xu, J., Shen, D., Suomalainen, S., Härkönen, A., Guina, M., Griebner, U., Petrov, V.
Publication date: 1 Jan 2018

Host publication information

Title of host publication: CLEO : Science and Innovations, CLEO_SI 2018
Publisher: OSA - The Optical Society
ISBN (Electronic): 9781557528209
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Mechanics of Materials
Source: Scopus
Source ID: 85048984709

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

Process time importance in the product properties evolvement during extrusion coating of different LDPE grades

Process time in air gap region is one of the most important variables in the coating property development, when the molten polymer is moving from the die exit into the nip region in extrusion coating. Coating property evolvement of different LDPE grades are presented in the paper. The importance of the throughput rate and line speed to the process times is discussed by considering the effect of molecular structure of different polyolefins. The draw down ratio based on the grammage measurements is proposed to use in the practical situations.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Materials Science, Research group: Paper Converting and Packaging
Contributors: Suokas, E., Kuusipalo, J.
Number of pages: 9
Pages: 151-159
Publication date: 1 Jan 2018

Host publication information

Title of host publication: 15th TAPPI Advanced Coating Fundamentals Symposium 2018 : Charlotte; United States; 14 April 2018 through 15 April 2018
Publisher: TAPPI Press
ISBN (Electronic): 9781510871885
ASJC Scopus subject areas: Media Technology, Materials Chemistry, Surfaces, Coatings and Films
Source: Scopus
Source ID: 85059262851

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

Multiwavelength surface contouring from phase-coded diffraction patterns

We propose a new algorithm for absolute phase retrieval from multiwavelength noisy phase coded diffraction patterns in the task of surface contouring. A lensless optical setup is considered with a set of successive single wavelength experiments. The phase masks are applied for modulation of the multiwavelength object wavefronts. The algorithm uses the forward and backward propagation for coherent light beams and sparsely encoding wavefronts which leads to the complex-domain block-matching 3D filtering. The key-element of the algorithm is an original aggregation of the multiwavelength object wavefronts for high-dynamic-range profile measurement. Numerical experiments demonstrate that the developed approach leads to the effective solutions explicitly using the sparsity for noise suppression and high-accuracy object profile reconstruction.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Signal Processing, Research group: Computational Imaging-CI, ITMO University
Contributors: Katkovnik, V., Shevkunov, I., Petrov, N. V., Eguiazarian, K.
Publication date: 1 Jan 2018

Host publication information

Title of host publication: Unconventional Optical Imaging 2018. Strasbourg, France
Volume: 10677
Publisher: SPIE
Article number: 106771B
ISBN (Print): 978-1-5106-1880-0

Publication series

Name: Proceedings of SPIE - The International Society for Optical Engineering
Volume: 10677
ISSN (Electronic): 0277-786X
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Computer Science Applications, Applied Mathematics, Electrical and Electronic Engineering
Keywords: absolute phase retrieval, discrete optical signal processing, Multiwavelength phase retrieval, phase imaging, surface contouring
Source: Scopus
Source ID: 85052446644

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

Digital image correlation study of the deformation and functioning of the human heart during open-heart surgery

Currently, ultrasound technology is routinely used for monitoring of the left side of the human heart during open-heart surgery. However, this method shows shortcomings in providing accurate information of the right ventricle and atrium. The aim of this paper is to demonstrate how Digital Image Correlation (DIC) can be used to monitor the functioning of the heart during open-heart surgery and potentially overcome some of the shortcomings of ultrasound methods. Being a contact-free method is a major asset from a practical implementation perspective of DIC. In this paper, we present the methodology of the experiment and some preliminary results of a study in which a DIC system was installed in an operating room and image sequences of the heart were taken at three stages of the surgery. We present a procedure for obtaining DIC measurements in this challenging setting, discuss how the data was extracted as well as how the measured values changed during the operation in the context of the surgical stages and interventions performed.

General information

Publication status: Published
MoE publication type: A4 Article in a conference publication
Organisations: Materials Science, Research group: Materials Characterization
Contributors: Solt