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  • 4851.
    Viberg, Olga
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Informatik.
    Grönlund, Åke
    Örebro University.
    Cross cultural analysis of users' attitudes towards the use of mobile devices in second and foreign language learning in higher education: a case from Sweden and China2013Ingår i: Computers and education, ISSN 0360-1315, E-ISSN 1873-782X, Vol. 69, s. 169-180Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The present study examined the current state of students' attitudes toward mobile technology use in and for second and foreign language learning in higher education. Moreover, the study investigated if age, gender or cultural factors affect these attitudes. A total of 345 students from two in many aspects different countries, China (Yunnan University) and Sweden (Dalarna University) participated in this study. To access learners' perceptions toward mobile technology use, we employed Kearney's pedagogical framework to mobile learning from a socio-cultural perspective (Kearney, Schuck, Burden, & Aubusson, 2012). Hofstede's cultural dimensions were used to approach students' cultural views, as these dimensions represent some values – aspects of culture – that may affect attitudes toward technology and learning individually as well as in combination. The findings show the respondents' attitudes toward mobile learning are very positive with individualization being most positive (83%) followed by collaboration (74%), and authenticity (73%). The statistical analysis indicates that Hofstede's factors cannot explain the differences in mobile-assisted language learning (MALL) attitudes in the chosen sample. Among the personal factors, gender is identified to be a predictor to explain the differences in students' attitudes toward MALL. This study shows that technology itself seems to be the most important culture-shaping factor, more important than culture inherited from the physical environment, and more important than age.

  • 4852.
    Viberg, Olga
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Informatik. Örebro University Business School, Örebro, Sweden.
    Grönlund, Åke
    Örebro University School of Business.
    Mobile Assisted Language Learning: A Literature Review2012Ingår i: 11th World Conference on Mobile and Contextual Learning, mLearn 2012, Helsinki, 2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    Mobile assisted language learning (MALL) is a subarea of the growing field of mobile learning (mLearning) research which increasingly attracts the attention of scholars. This study provides a systematic review of MALL research within the specific area of second language acquisition during the period 2007 - 2012 in terms of research approaches, methods, theories and models, as well as results in the form of linguistic knowledge and skills. The findings show that studies of mobile technology use in different aspects of language learning support the hypothesis that mobile technology can enhance learners’ second language acquisition. However, most of the reviewed studies are experimental, small-scale, and conducted within a short period of time. There is also a lack of cumulative research; most theories and concepts are used only in one or a few papers. This raises the issue of the reliability of findings over time, across changing technologies, and in terms of scalability. In terms of gained linguistic knowledge and skills, attention is primarily on learners’ vocabulary acquisition, listening and speaking skills, and language acquisition in more general terms.

  • 4853.
    Viberg, Olga
    et al.
    Örebro universitet, Handelshögskolan vid Örebro Universitet. Dalarna University, Falun, Sweden.
    Grönlund, Åke
    Örebro universitet, Handelshögskolan vid Örebro Universitet.
    Systematising the Field of Mobile Assisted Language Learning2013Ingår i: International Journal of Mobile and Blended Learning, ISSN 1941-8647, E-ISSN 1941-8655, Vol. 5, nr 4, s. 72-90Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study provides a systematic review of mobile assisted language (MALL) research within the specific area of second language acquisition (SLA) during the period of 2005-2012 in terms of research approaches, theories and methods, technology, and the linguistic knowledge and skills’ results. The findings show a shift from the prevailing SMS-based language learning in 2005-2008 towards the use of more advanced multimedia and intelligent learning systems in the last years. Many highly cited studies focus on design of mobile language learning systems and experimental evaluation of their effectiveness. Studies often draw on mature pedagogic models and methods. However, descriptive and small-scale experimental studies dominate. In terms of theoretical approaches and frameworks, there is a lack of specific reference to mobile learning conceptual and theoretical models, which makes it difficult to distinguish any specific mobile learning theories from other learning theories. Research has so far paid most attention to learners’ vocabulary acquisition.

  • 4854.
    Viborg Andersen, Kim
    et al.
    Copenhagen Business School, Denmark.
    Grönlund, Åke
    Örebro universitet, Institutionen för ekonomi, statistik och informatik.
    Moe, Carl Erik
    Agder University College, Norway.
    Sein, Maung K.
    Agder University College, Norway.
    E-government in Scandinavia2005Ingår i: Scandinavian Journal of Information Systems, ISSN 0905-0167, E-ISSN 1901-0990, Vol. 17, nr 2, s. 3-10Artikel i tidskrift (Refereegranskat)
  • 4855. Viborg Andersen, Kim
    et al.
    Grönlund, ÅkeÖrebro universitet, Institutionen för ekonomi, statistik och informatik.Traunmüller, RolandWimmer, Maria
    Electronic government: workshop and poster proceedings of the fourth international EGOV conference, August 22-26, 2005, Copenhagen, Denmark2005Proceedings (redaktörskap) (Övrigt vetenskapligt)
  • 4856.
    Vickman, Sara
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Larsson, Aron
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Olsson, Leif
    Mittuniversitetet, , Dept. of Information Technology and Media.
    Prerequisites for Decision Aid in Socially Responsible Investment Appraisals2012Ingår i: International Journal of Engineering Management and Economics (IJEME), ISSN 1756-5154, E-ISSN 1756-5162, Vol. 3, nr 4, s. 359-377Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper explores investment appraisals (or capital budgeting decisions) restrained by various sources of uncertainty and influenced by corporate social responsibility and socially responsible investment thinking (SRI). The study aims to provide input for further development of computer based methods for integrating semi-quantitative decision analysis modelling with other quantitative methods for investment evaluations. Of particular interest in this paper is to assess the additional aspects of investment appraisals that derive from SRI thinking together with the multiple sources of uncertainty arising in such decision problems. We assess characteristics of how managers’ try to account for corporate social responsibility, how they cope with evaluating upon objectives beyond monetary return on investment (ROI) and how they manage uncertainty and the source of the uncertainties they emphasize. The perceived need for analytical decision aid in socially responsible investment decision making is analysed and the applicability of real options is assessed relative to the managers’ conditions and concerns. We conclude that organisations are generally exposed to and also consider both aleatory and epistemic uncertainty and need to handle other aspects of investments beyond monetary ROI. There is a mix of macro and micro variables creating a diversified environment where valuation methods such as real options in combination with decision analysis modelling could help in structuring the problem and enlighten different areas and aspects, thereby providing a framework for accounting for corporate social responsibility in capital budgeting decision making.

  • 4857.
    Viet Tran, Linh
    Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
    Efficient Image Retrieval with Statistical Color Descriptors2003Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Color has been widely used in content-based image retrieval (CBIR) applications. In such applications the color properties of an image are usually characterized by the probability distribution of the colors in the image. A distance measure is then used to measure the (dis-)similarity between images based on the descriptions of their color distributions in order to quickly find relevant images. The development and investigation of statistical methods for robust representations of such distributions, the construction of distance measures between them and their applications in efficient retrieval, browsing, and structuring of very large image databases are the main contributions of the thesis. In particular we have addressed the following problems in CBIR.

    Firstly, different non-parametric density estimators are used to describe color information for CBIR applications. Kernel-based methods using nonorthogonal bases together with a Gram-Schmidt procedure and the application of the Fourier transform are introduced and compared to previously used histogram-based methods. Our experiments show that efficient use of kernel density estimators improves the retrieval performance of CBIR. The practical problem of how to choose an optimal smoothing parameter for such density estimators as well as the selection of the histogram bin-width for CBIR applications are also discussed.

    Distance measures between color distributions are then described in a differential geometry-based framework. This allows the incorporation of geometrical features of the underlying color space into the distance measure between the probability distributions. The general framework is illustrated with two examples: Normal distributions and linear representations of distributions. The linear representation of color distributions is then used to derive new compact descriptors for color-based image retrieval. These descriptors are based on the combination of two ideas: Incorporating information from the structure of the color space with information from images and application of projection methods in the space of color distribution and the space of differences between neighboring color distributions. In our experiments we used several image databases containing more than 1,300,000 images. The experiments show that the method developed in this thesis is very fast and that the retrieval performance chievedcompares favorably with existing methods. A CBIR system has been developed and is currently available at http://www.media.itn.liu.se/cse.

    We also describe color invariant descriptors that can be used to retrieve images of objects independent of geometrical factors and the illumination conditions under which these images were taken. Both statistics- and physics-based methods are proposed and examined. We investigated the interaction between light and material using different physical models and applied the theory of transformation groups to derive geometry color invariants. Using the proposed framework, we are able to construct all independent invariants for a given physical model. The dichromatic reflection model and the Kubelka-Munk model are used as examples for the framework.

    The proposed color invariant descriptors are then applied to both CBIR, color image segmentation, and color correction applications. In the last chapter of the thesis we describe an industrial application where different color correction methods are used to optimize the layout of a newspaper page.

  • 4858. Vilkkumaa, Eeva
    et al.
    Salo, Ahti
    Liesio, Juuso
    Siddiqui, Afzal
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, UK.
    Fostering breakthrough technologies - How do optimal funding decisions depend on evaluation accuracy?2015Ingår i: Technological forecasting & social change, ISSN 0040-1625, E-ISSN 1873-5509, Vol. 96, s. 173-190Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    There is a growing interest in fostering breakthrough technologies that offer exceptionally high value to society. However, when starting technology projects, it is impossible to know which of them have the potential to lead to breakthroughs. Therefore, organizations have adopted funding policies in which on-going projects are subjected to interim evaluations based on which some projects may be abandoned to release resources for seizing new opportunities. In this paper, we study which funding policies are optimal when the objective is either (i) to maximize the expected value of the project portfolio, or (ii) to maximize the expected number of exceptionally excellent projects that may lead to breakthrough technologies. We show that the optimal policy for funding exceptionally excellent projects is to start a large number of projects and abandon a high proportion of them later, whereas the optimal policy for maximizing the expected value of the project portfolio is to grant long-term funding to a smaller set of projects based on initial evaluation. Furthermore, we show how the trade-off between these two objectives depends on the initial project evaluation accuracy and the rate at which this accuracy improves. Our results suggest that this trade-off is particularly significant when the initial project evaluations are very uncertain but become more accurate soon after the projects have been launched. In such a setting, policies that seek to maximize the expected portfolio value may fail to promote breakthrough technologies.

  • 4859.
    Vimarlund, Vivian
    et al.
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Informatik.
    Koch, Sabine
    Health Informatics Centre, Department of Learning, Informatics, Management and Ethics.
    Identifying Where the Values Come from IT-Innovations in Health and Social Care2012Ingår i: Intelligent Information Management, ISSN 2160-5912, E-ISSN 2160-5920, Vol. 4, nr 5A, s. 296-308Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Studies aimed to capture the effects of IT-innovations in health and social care have shown that there is a gap between expected and factual outcomes. Many decision makers feel the need to articulate an ideal end-state for their organiza-tions. Striking the balance between novelty and believability of such an ideal end-state is often tricky and they become neither satisfied with the ideal not the visioning. In this study, we explore the contribution of IT-innovations to health and social care. The results showed that coherence between context and IT-innovation is important to capture effects and outcomes. Being coherent rather than visionary contributes to identify where you are, as an organization, and to capture effects and outcomes that “make sense” in the context in question. The paper makes an exposition from the model building, algorithm design to performance analysis and contributes to the academic prosperity in Intelligent In-formation Management The knowledge generated is expected to provide input when identifying goals that IT-investments are supposed to achieve.

  • 4860. Virasjoki, Vilma
    et al.
    Rocha, Paula
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, U.K..
    Salo, Ahti
    Market Impacts of Energy Storage in a Transmission-Constrained Power System2016Ingår i: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 31, nr 5, s. 4108-4117Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Environmental concerns have motivated governments in the European Union and elsewhere to set ambitious targets for generation from renewable energy (RE) technologies and to offer subsidies for their adoption along with priority grid access. However, because RE technologies like solar and wind power are intermittent, their penetration places greater strain on existing conventional power plants that need to ramp up more often. In turn, energy storage technologies, e.g., pumped hydro storage or compressed air storage, are proposed to offset the intermittency of RE technologies and to facilitate their integration into the grid. We assess the economic and environmental consequences of storage via a complementarity model of a stylized Western European power system with market power, representation of the transmission grid, and uncertainty in RE output. Although storage helps to reduce congestion and ramping costs, it may actually increase greenhouse gas emissions from conventional power plants in a perfectly competitive setting. Conversely, strategic use of storage by producers renders it less effective at curbing both congestion and ramping costs, while having no net overall impact on emissions.

  • 4861. Vitak, Jessica
    et al.
    Wisniewski, Pamela
    Page, Xinru
    Lampinen, Airi
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Litt, Eden
    De Wolf, Ralf
    Gage Kelley, Patrick
    Sleeper, Manya
    The Future of Networked Privacy: Challenges and Opportunities2015Ingår i: CSCW'15, the 18th ACM Conference Computer Supported Cooperative Work & Social Computing, ACM Press , 2015Konferensbidrag (Övrigt vetenskapligt)
  • 4862. Višković, Verena
    et al.
    Chen, Yihsu
    Siddiqui, Afzal S.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. University College London, United Kingdom; HEC Montréal, Canada.
    Implications of the EU Emissions Trading System for the South-East Europe Regional Electricity Market2017Ingår i: Energy Economics, ISSN 0140-9883, E-ISSN 1873-6181, Vol. 65, s. 251-261Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    As part of its climate policy, the European Union (EU) aims to reduce greenhouse gas (GHG) emissions levels by 20% by the year 2020 compared to 1990 levels. Although the EU is projected to reach this goal, its achievement of objectives under its Emissions Trading System (ETS) may be delayed by carbon leakage, which is defined as a situation in which the reduction in emissions in the ETS region is partially offset by an increase in carbon emissions in the non-ETS regions. We study the interaction between emissions and hydropower availability in order to estimate the magnitude of carbon leakage in the South-East Europe Regional Electricity Market (SEE-REM) via a bottom-up partial equilibrium framework. We find that 6.3% to 40.5% of the emissions reduction achieved in the ETS part of SEE-REM could be leaked to the non-ETS part depending on the price of allowances. Somewhat surprisingly, greater hydropower availability may increase emissions in the ETS part of SEE-REM. However, carbon leakage might be limited by demand response to higher electricity prices in the non-ETS area of SEE-REM. Such carbon leakage can affect both the competitiveness of producers in ETS member countries on the periphery of the ETS and the achievement of EU targets for CO2 emissions reduction. Meanwhile, higher non-ETS electricity prices imply that the current policy can have undesirable outcomes for consumers in non-ETS countries, while non-ETS producers would experience an increase in their profits due to higher power prices as well as exports. The presence of carbon leakage in SEE-REM suggests that current EU policy might become more effective when it is expanded to cover more countries in the future.

  • 4863. Void, Tone
    et al.
    Marzo, Richard
    Waern, Annika
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Play Style Survey2009Ingår i: Real-Time research: an experiment in the design of scholarship / [ed] S. Dikkers, C. Steinkuhler, K. Squire, and E. Zimmerman, Pittsburgh: ETC Press, 2009Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 4864.
    von Briel, Frederik
    et al.
    School of Management, QUT Business School, QUT, Brisbane, Australia.
    Davidsson, Per
    Högskolan i Jönköping, Internationella Handelshögskolan, IHH, Företagsekonomi. Högskolan i Jönköping, Internationella Handelshögskolan, JIBS Entrepreneurship Centre. Australian Centre for Entrepreneurship Research, QUT Business School, QUT, Brisbane, Australia.
    Recker, Jan
    Faculty of Management, Economics and Social Sciences, University of Cologne, Germany.
    Digital Technologies as External Enablers of New Venture Creation in the IT Hardware Sector2018Ingår i: Entrepreneurship: Theory & Practice, ISSN 1042-2587, E-ISSN 1540-6520, Vol. 42, nr 1, s. 47-69Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We develop theory about how and when digital technologies enable new venture creation processes. We identify two fundamental properties of digital technologies-specificity and relationality-and develop propositions that link these properties to six enabling mechanisms: compression, conservation, expansion, substitution, combination, and generation. We use the linked properties and mechanisms to determine how and when in the venture creation process-from prospecting to developing to exploiting-digital technologies have enabled start-ups in the IT hardware sector and develop stage-dependent propositions about their sector-level effects. We conclude our theorizing by discussing its implications beyond digital technologies and the IT hardware sector.

  • 4865.
    von Euler-Chelpin, Astrid
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Information modelling for the manufacturing system life cycle2008Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    This thesis deals with information modelling within the scope of the manufacturing system life cycle, i.e. the development phase and the operation phase. Information modelling defines and structures information that needs to be managed, and is thereby an important step towards realising efficient information management throughout the manufacturing system life cycle.

    The research goal of this work was to find a modelling approach that simplifies management and integration of manufacturing system information, both within and between the development and operation phases. The starting point was an assumption that information integration requires a common information model for the manufacturing system life cycle. The approach was to evaluate the usefulness of the STEP standards AP214 and AP239 (PLCS) regarding how they meet the information requirements. Case studies within the automotive industry were carried out for gathering test data.

    Modelling experience showed that PLCS has the most suitable scope since it can represent the manufacturing system from a life cycle perspective. However, the generic character of PLCS introduced other issues, such as how to ensure consistent instantiation. Further guidance is needed regarding how to use PLCS for representing domain-specific objects such as machining centres.

    As a response to the inconsistency issue, a concept model of a machining centre was developed to guide the instantiation of PLCS. However, it was found that there are multiple ways to translate the concept model to PLCS depending on viewpoint. Moreover, the characteristics of information management within the operation phase were found to be notably different compared to characteristics of the development phase. For these reasons, it is discussed whether or not a common modelling format for the whole manufacturing system life cycle is appropriate or even realisable.

    From a practical viewpoint, it is concluded to be both inevitable and necessary to find appropriate delimitations and interfaces between complementary information models. A promising step towards information integration is to classify the information concepts of different models according to terms defined in concept models.

  • 4866.
    von Schéele, Fabian
    et al.
    Stockholm Univ.
    Haftor, Darek
    Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för informatik (IK).
    Cognitive Time Distortion on the Performance of Economic Organizations2014Ingår i: Systems research and behavioral science, ISSN 1092-7026, E-ISSN 1099-1743, Vol. 31, nr 1, s. 77-93Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper introduces a novel conception of an economic organization, where its Total Profit Equation accounts for the phenomenon of cognitive time distortionthis being understood as the discrepancy between physical and cognitive time. Cognitive time distortion is unconditionally inherent in all human beings and everything they do, and typically produces economic inefficiencies as well as human stress; all this may now be conceptualized, detected, and acted upon. The novel Total Profit Equation as introduced here, including its underlying Total Revenue Equation and the Total Cost Equation, echoes a call of the founders of Systems Sciences that non-trivial systems manifest several kinds of temporal experiences. This call has largely been ignored by the various disciplines that study organizations and their management, particularly economic organizations, where the temporal experience of economic organizations is reduced to physical time. In this sense, this contribution offers an alternative to remedy that reductionism. Copyright (c) 2013 John Wiley & Sons, Ltd.

  • 4867. Vorontsova, Anna
    et al.
    Rusu, Lazar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Determinants of IT Outsourcing Relationships: a Recipient - Provider Perspective2014Ingår i: CENTERIS - Conference on ENTERprise Information Systems / [ed] João Varajão, Amsterdam: Elsevier, 2014, s. 588-597Konferensbidrag (Refereegranskat)
  • 4868. Vrazalic, L.
    et al.
    MacGregor, R.C.
    Bunker, D.
    Carlsson, Sten
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning.
    Magnusson, Monika
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning. Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Centrum för HumanIT.
    A Comparison of Factors Pertaining to the Adoption and Non-adoption of Electronic Commerce in Formally Networked and Net-worked Regional SMESs: A Study of Swedish Small Businesses2003Ingår i: eBusiness, eGovernment & Small and Medium-Sized Enterprises: Opportunities and Challenges / [ed] Corbitt, B. & Al-Qirim, N, Hershey: IDEA Group Publishing , 2003Kapitel i bok, del av antologi (Refereegranskat)
  • 4869. Vrazalic, L.
    et al.
    MacGregor, R.C.
    Bunker, D.
    Carlsson, Sten
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning.
    Magnusson, Monika
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning. Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Centrum för HumanIT.
    Electronic Commerce and Market Focus: Some Findings from a Study of Swedish Small to Medium Enterprises2002Ingår i: Australian Journal of Information Systems, vol 10, No 1Artikel i tidskrift (Refereegranskat)
  • 4870. Vrazalic, L.
    et al.
    MacGregor, R.C.
    Bunker, D.
    Carlsson, Sten
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning.
    Magnusson, Monika
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning. Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Centrum för HumanIT.
    Electronic Commerce Investment and Adoption in Small to Medium Enterprises: Findings from a Swedish Study2002Konferensbidrag (Refereegranskat)
  • 4871. Vrazalic, L.
    et al.
    Stern, D.
    MacGregor, R.C.
    Bunker, D.
    Carlsson, Sten
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning.
    Magnusson, Monika
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning. Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Centrum för HumanIT.
    Barriers to E-Commerce Adoption in SMEs: Underlying Factors from a Swedish Study2003Konferensbidrag (Refereegranskat)
  • 4872.
    Vöhringer, Jurgen
    et al.
    Institute for Applied Informatics, Alpen-Adria Universität Klagenfurt.
    Bellström, Peter
    Karlstads universitet, Fakulteten för ekonomi, kommunikation och IT, Avdelningen för informatik och projektledning.
    Gälle, Doris
    Institute for Applied Informatics, Alpen-Adria Universität Klagenfurt.
    Kop, Christian
    Institute for Applied Informatics, Alpen-Adria Universität Klagenfurt.
    Designing a study for evaluating user feedback on predesign models2009Ingår i: Information Systems Development: Challenges in Practice, Theory, and Education / [ed] Chris Barry, Michael Lang, Wita Wojtkowski, Kieran Conboy, Gregory Wojtkowski, Boston: Springer , 2009, s. 411-423Konferensbidrag (Refereegranskat)
    Abstract [en]

    Predesign schemata are an attempt to overcome the communication gap between end users and computer scientists in software development. We argue that by presenting facilitated models to the users, schema interpretation is made easier. The predesign principle is also helpful in areas such as software documentation. Our uses of predesign models share the basic assumption that these models are easier to understand for end users. In this chapter we present a design for an experimental study that aims to evaluate these assumptions

  • 4873.
    Waddington, Simon
    et al.
    King's College London, UK.
    Hedges, Mark
    King's College London, UK.
    Riga, Marina
    CERTH, Thessaloniki, Greece.
    Mitzias, Panagiotis
    CERTH, Thessaloniki, Greece.
    Kontopoulos, Efstratios
    CERTH, Thessaloniki, Greece.
    Kompatsiaris, Ioannis
    CERTH, Thessaloniki, Greece.
    Vion-Dury, Jean-Yves
    XRCE, Grenoble, France.
    Lagos, Nikolaos
    XRCE, Grenoble, France.
    Darányi, Sándor
    Högskolan i Borås, Akademin för bibliotek, information, pedagogik och IT.
    Corubolo, Fabio
    University of Liverpool, UK.
    Muller, Christian
    BUSOC, Belgium.
    McNeill, John
    Tate Galleries, London, UK.
    PERICLES – Digital Preservation through Management of Change in Evolving Ecosystems.2016Ingår i: The Success of European Projects Using New Information and Communication Technologies / [ed] Hamriouni, S., Setubal, Portugal, 2016, s. 51-74Konferensbidrag (Refereegranskat)
    Abstract [en]

    Management of change is essential to ensure the long-term reusabilityof digital assets. Change can be brought about in many ways, includingthrough technological, user community and policy factors. Motivated by casestudies in space science and time-based media, we consider the impact ofchange on complex digital objects comprising multiple interdependent entities,such as files, software and documentation. Our approach is based on modellingof digital ecosystems, in which abstract representations are used to assess risksto sustainability and support tasks such as appraisal. The paper is based onwork of the EU FP7 PERICLES project on digital preservation, and presentssome general concepts as well as a description of selected research areas underinvestigation by the project.

  • 4874.
    Waern, Annika
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    I'm in love with someone who doesn't even exist! Bleed in the context of a computer game2010Ingår i: Nordic DIGRA conference, 2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    It is not unusual for computer games to include romance, but most games treat romance as a narrative theme rather than as an integrated part of gameplay. In this article I investigate the gameplay experience in the game Dragon Age, a single-player game that allows players to actively engage in romance. Based on an investigation of blog and community comments, we argue that this sometimes will create an experience that is similar to the “bleed” effect in non-computerised role-play, and that the player to some extent shares emotions with his or her character.
  • 4875.
    Waern, Annika
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Framing Games2012Ingår i: Proceedings of 2012 DiGRA Nordic Conference: Local and Global – Games in Culture and Society, Digital Games Research Association , 2012Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this article, I revisit the everlasting question of what constitutes a game. My purpose is to arrive at a permissive definition that can serve to bridge digital and non-digital game studies. The way I approach the issue is through eliciting the qualities of games for which I believe game studies provides appropriate tools. The article centres on the idea that games are systems, which have been designed to be played or evolved within a play practice. I use previous literature to carefully examine what is required from a game system, as well as what signifies play in relationship to other human activities. The strength of game studies is that it has developed ways to understand how these two aspects are interrelated - how play is shaped by systems, and how systems need to be constructed to support play.

  • 4876.
    Waern, Annika
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    I'm in love with someone who doesn't exist!: Bleed in the context of a computer game2011Ingår i: Journal of Gaming & Virtual Worlds, ISSN 1757-191X, E-ISSN 1757-1928, Vol. 3, nr 3, s. 239-257Artikel i tidskrift (Refereegranskat)
    Abstract [sv]

    Det är inte ovanligt att datorspel innehåller romantiska element, men det är ovanligt att datorspel får folk att reagera med romantiska känslor. I den här artikeln undersöker jag den romantiska upplevelsen i spelet Dragon Age. Med utgångspunkt i en samling blog- och community kommentarer argumenterar jag för att spelet skapar en 'bleed' effekt: på så sätt att en del spelare förälskar sig i de karaktärer som de utvecklat en romans med i spelet. Artikeln identifierar vissa nyckelaspekter i hur spelets design bidrar till effekten. Utöver berättelsestrukturer och design av spelets karaktärer visar jag hur spelarnas egen önskan att skapa en 'säker zon' för romantiska upplevelser och hur spelarens självprojektion bidrar till effekten.

  • 4877.
    Waern, Annika
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Balan, Elena
    Nevelsteen, Kim
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Athletes and street acrobats: designing for play as a community value in parkour2012Ingår i: CHI '12 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, New York: Association for Computing Machinery (ACM), 2012, s. 869-878Konferensbidrag (Refereegranskat)
    Abstract [en]

    Participatory design methods face challenges when designing for a widespread youth community. In such projects, it is not enough to design in collaboration with a few selected individuals; one must also strive to understand the community at a deeper level and incorporate its values and practices into the design solution. We report on our process of designing with, and for, an identified youth group: the Parkour and Freerunning community. We show how the successful design relied not only on employing methods of participatory observation and participatory design, but also on acquiring an understanding of the practice as a ‘fun community’, valuing play over achievement and competition.

  • 4878.
    Waern, Annika
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Magnusson, Charlotte
    CERTEC, , .
    Rassmus-Gröhn, K
    CERTEC, , .
    Bjernryd, Å
    CERTEC, , .
    Bernhardsson, H
    CERTEC, , .
    Jakobsson, A
    CERTEC, , .
    Salo, J
    Do-Fi, , .
    Wallon, M
    Hjälpmedelscentralen, , .
    Hedvall, P.O.
    CERTEC, , .
    Navigating the world and learning to like it: Mobility training through a pervasive game2011Konferensbidrag (Refereegranskat)
    Abstract [sv]

    Artikeln introducerar tanken att platsberoende ubika spel kan användas för att göra mobilitetsträning för synskadade barn roligare. Vi beskriver en användarcentrerad utvecklingsprocess som har utförts i samarbete både med synskadade barn och rehabiliteringspersonal. Vi presenterar ett nytt spelkoncept som kombinerar platsberoende spel, ljudspår, och gestbaserad interaktion. Vi rapporterar ochdiskuterar erfarenheterna från utvecklingsarbetet och föreslår riktlinjer för design för denna typ av spel.

  • 4879.
    Wahlgren, Gunnar
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Bencherifa, Khalid
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kowalski, Stewart
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    A Framework for selecting IT Security Risk Management Methods based on ISO270052013Konferensbidrag (Refereegranskat)
    Abstract [en]

    The ISO27005 is an international standard that gives recommendation on IT Security Risk Management Methods. In this short paper we outline a criteria framework to analysis 7 of the major IT security risk methodology used. This framework can be used by organizations to select the appropriated methodology to fit their organizations risk posture and risk environment.

  • 4880.
    Wahlgren, Gunnar
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Fedotova, Anna
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Musaeva, Alexandra
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kowalski, Stewart
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    IT Security Incidents Escalation in the Swedish financial sector: A Maturity Model Study2016Ingår i: Proceedings of the Tenth International Symposium on Human Aspects of Information Security & Assurance (HAISA 2016) / [ed] Nathan L. Clarke, Steven M. Furnell, Plymouth University , 2016, s. 45-55Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper reports the primary results of a design science research study to deal with the problem of IT security escalation in Swedish government and private organizations. A maturity capability escalation model was used to perform evaluations of two of Sweden's four largest banks. The evaluation indicated that banks were aligned with the current Swedish regulations minimal requirements for IT security incident handling and where on a level 3 of a 5 level model.

  • 4881.
    Wahlgren, Gunnar
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kowalski, Stewart
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    A Maturity Model for Measuring Organizations Escalation Capability of IT-related Security Incidents in Sweden2016Ingår i: Workshop on Information Security and Privacy (WISP) 2016: Proceedings, Association for Information Systems, 2016, Vol. 8Konferensbidrag (Refereegranskat)
    Abstract [en]

    Managing IT-related security incidents are a growing important issue facing the organizations in IT security risk management. We have used design science approach to develop an artifact to measure different organizations capabilities and maturity to handle IT-related security incidents. In this paper, we present how we have tested and will test the artifact on several different Swedish organizations. The participating organizations come from both the private and public sectors and all organizations handle critical infrastructure which can be damaged if an IT-related security incident occurs. Organizations had the opportunity to evaluating the actual model itself but also to test the model by calculating the organization's escalation capability using a query package for self-assessment. In this paper, we present the results of the self-assessment which indicate an overall low level of maturity in Sweden. The most remarkable result was only 20% of the participating organizations in the study had "Knowledge and Education" maturity above the lowest levels.

  • 4882.
    Wahlgren, Gunnar
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kowalski, Stewart
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Evaluation of Escalation Maturity Model for IT Security Risk Management: a design Science Work in Progress2014Ingår i: 2014 Dewald Roode Worksshop on Information System Security Research: conference proceedings / [ed] Anthony Vance, Laxenburg: IFIP , 2014, s. -22Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this early stage paper we present a draft of an IT Security Risk Escalation Capability Maturity Model. This model is used to develop a new approach to IT Security Risk Management where IT Security Risk Management is placed as a recurring activity at all levels of the organization including the strategic, tactical and operational levels. To construct this model we combined ISO 27005 framework for IT Security Risk Management with NIST Multitier framework and take elements from the ISAC IT Risk framework. We end our paper with an outline of our current plans to evaluate this escalation maturity model by using expert groups to rank outcomes of response to similar IT incidents by different organization that have been ranked according to this maturity model. In this way we hope to establish if there are correlations as to the maturity level of an organization and how well it responds to an IT incident.

  • 4883.
    Wahlgren, Gunnar
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kowalski, Stewart
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    IT Security Risk Management Model for Cloud Computing: a Need for a New Escalation Approach2013Ingår i: International Journal of E-Entrepreneurship and Innovation, ISSN 1947-8585, Vol. 4, nr 4, s. 1-19Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We combined ISO 27005 framework for IT Security Risk Management with NIST Multitier framework. With this combined framework we create a new approach to IT Security Risk Management where IT Security Risk Management is place at the strategic, tactical and operational levels of an organizational. In this paper we concentrate on the monitoring and communication steps of IT Security Risk Management and especially escalation of new IT Security Incidents. We present a first draft to an IT Security Risk Escalation Capability Maturity Model based on ISACA´s Risk IT Framework. Finally we apply the approach to typical cloud computing environment as a first step to evaluate this new approach.

  • 4884.
    Wahlgren, Gunnar
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kowalski, Stewart
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    IT Security Risk Management Model for Cloud Computing: A Need for a New Escalation Approach2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    We combined ISO 27005 framework for IT Security Risk Management with NIST Multitier framework and we claim that IT Security Risk Management framework exist at each organizational levels. In this paper we concentrate on the monitoring and communication steps of IT Security Risk Management and especially escalation of new IT Security Incidents. We present a first draft to an IT Security Risk Escalation Capability Maturity Model based on ISACA´s Risk IT Framework. Finally we will use our approach in a cloud computing environment as we believe that it is necessary to react fast on incident and therefore a need to have a well-documented and communicated monitoring and escalation processes between different organizational levels.

  • 4885.
    Waldenström, Christofer
    Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Ledningsvetenskapliga avdelningen (LVA).
    Using uncertainties as basis for evaluating plans2007Ingår i: Proceedings of the 11th international conference, KES 2007 and XVII Italian workshop on neural networks conference on Knowledge-based intelligent information and engineering systems: Part I / [ed] Bruno Apolloni, Robert J. Howlett, Lakhmi Jain, Heidelberg: Springer-Verlag Berlin , 2007, s. 254-261Konferensbidrag (Refereegranskat)
  • 4886.
    Wallace, Andrew
    et al.
    Umeå universitet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    Madison, G
    Umeå universitet, Samhällsvetenskapliga fakulteten, Institutionen för psykologi.
    The timing accuracy of general purpose computers for experimentation and measurements in psychology and the life sciences2012Ingår i: Open Psychology Journal, ISSN 1874-3501, E-ISSN 1874-3501, Vol. 5, s. 44-53Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    General purpose computers find increased use within behavioural, psychological, and neuroscientific experi-mentation, which raises concern for the timing accuracy that can be obtained with such systems. Here, we assessed the timing accuracy of such machines, considering both differences between different hardware and different versions of the Windows™ operating system (OS); Windows XP, Vista and Windows 7. The variability varied widely across machines and OS versions. The indeterministic variability within each OS and computer combination was mostly within +/-30 ms, and had a non-normal distribution with many small deviations and few large deviations. These large deviations are a char-acteristic feature that seems to constitute occasional additional delays up to about 150 ms. Thus, although measurements recorded from a general purpose PC running Windows should have an accuracy of -30 to +50 ms, occasionally larger variations suggest that experiments need a large test base to avoid significant distortions of the results.

  • 4887.
    Wallin, Peter
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Identifying and Managing Key Challenges in Architecting Software-Intensive Systems2011Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    In many traditional industry applications, such as automotive, process automation and manufacturing automation, software plays a crucial role as an enabler for the introduction of new functionality and retaining competitiveness. The system and software architecture plays an important part in ensuring the systems’ qualities. However, the design of the architecture may be neglected during system development, whilst development efforts are centered on implementing new functionality. The architecture is supposed to support and enable key quality attributes such as safety, reliability, maintainability and flexibility, and so on. This thesis identifies some of the key issues in architecting these software intensive systems. In total, 21 issues have been identified; examples of these issues are (1) there is a lack of process for architecture development, (2) there is a lack of method or model to evaluate business value when choosing architecture, (3) there is a lack of clear long-term architectural strategy, and (4) processes and methods are less valued than individuals’ knowledge and competence. Through a series of workshops, root causes were identified for a selection of these issues. Based on these root causes, five success factors were identified. The success factors are (1) define an architectural strategy (2) implement a process for architectural work (3) ensure authority for architects (4) clarify the business impact of the architecture and (5) optimize on the project portfolio level instead of optimizing each project. In an attempt to provide a possible solution to some of the issues, a method has been created to evaluate how new functionality is successfully integrated into an existing architecture. The method is a combination of the Architecture Tradeoff Analysis Method, ATAM, and the Analytical Hierarchy Process, AHP. The method firstly supports a structured way of listing system goals, and secondly, it also supports design decision-making. Since several issues relate to the organization and are affected by management, a comparison was made between the view of management and architects. This study revealed that one cause for the lack of focus on architecture could be that the existing performance measurement systems used by management all focus on the later phases of development when the architecture is already set.

     

  • 4888.
    Wallin, Peter
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Larsson, Stig
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Fröberg, Joakim
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Axelsson, Jakob
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Practitioners’ views of Key Issues and their Solutions in the Development of System and Software ArchitectureManuskript (preprint) (Övrigt vetenskapligt)
    Abstract [en]

    Context: In many traditional industry applications, including automotive, process automation and manufacturing automation, software plays a crucial role as an enabler in the introduction of new functionality and to stay competitive. System and software architecture plays an important part in ensuring the qualities of the systems. However, the design of the architecture may be neglected during system development, whilst development efforts are centered on implementing new functionality.

    Objective: We present the challenges, problems, and success factors that are central to the architectural development of software intensive systems as judged by practitioners.

    Method: The method used consisted of three steps. First, we used semi-structured interviews to collect data in an exploratory manner. In a second step, a survey based on issues extracted from the structured interview data was used to investigate the occurrence of these issues in a wide range of organizations. In order to identify and suggest solutions to the issues that were considered important, we finally performed root cause analysis workshops.

    Results: A total of 21 issues have been identified, and examples of these issues are (1) there is a lack of process in architecture development, (2) there is a lack of methodology or models for evaluating business value when choosing architecture, (3) there is a lack of clear long-term architectural strategy, and (4) processes and methods are of less value than the knowledge and competence of individuals.

    Conclusion: In conclusion, we are convinced that the following success factors are crucial components in developing software intensive systems: (1) defining an architectural strategy, (2) implementing a process for architectural work, (3) ensuring authority for architects, (4) clarifying the business impact of the architecture, and (5) optimization at the project portfolio level, instead of optimizing each project.

     

  • 4889.
    Walters, Jamie
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Distributed Immersive Participation: Realising Multi-Criteria Context-Centric Relationships on an Internet of Things2014Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Advances in Internet-of-Things integrate sensors and actuators in everyday items or even people transforming our society at an accelerated pace. This occurs in areas such as agriculture, logistics, transport, healthcare, and smart cities and has created new ways to interact with and experience entertainment, (serious) games, education, etc. Common to these domains is the challenge to realize and maintain complex relations with any object or individual globally, with the requirement for immediacy in maintaining relations of varying complexity. Existing architectures for maintaining relations on the Internet, e.g., DNS and search engines are insufficient in meeting these challenges. Their deficiencies mandate the research presented in this dissertation enabling the maintenance of dynamic and multi-criteria relationships among entities in real-time in an Internet-of-Things while minimizing the overall cost for maintaining such context-centric relationships. A second challenge is the need to represent nearness in context-centric relationships, since solutions need to build on what is closely related.

    The dissertation shows that the proximity on relations can be used to bring about the scalability of maintaining relationships across the IoT. It successfully demonstrates the concept and feasibility of self-organizing context-centric overlay networks for maintaining scalable and real-time relationships between endpoints co-located with associated physical entities. This is complemented by an object model for annotating objects and their relationships as derived and defined over the underpinning context interactions. Complementing measures of nearness are added through a non-metric multi-criteria approach to evaluating the notion of context proximity. A query language and an extension to the publish-subscribe approaches achieves distributed support for discovering such relationships; locating entities relative to a defined hyper-sphere of interest. Furthermore, it introduces adaptive algorithms for maintaining such relationships at minimal overall costs. The results demonstrate the feasibility of moving towards context-centric approaches to immersion and that such approaches are realizable over vast and distributed heterogeneous collections of user and their associated context information.

  • 4890.
    Walters, Jamie
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap. Mid Sweden University.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    A Context-Relational Approach for the Internet of Things2012Ingår i: EMERGING 2012, The Fourth International Conference on Emerging Network Intelligence / [ed] Michael D. Logothetis, Tulin Atmaca, International Academy, Research and Industry Association (IARIA), 2012, s. 49-55Konferensbidrag (Refereegranskat)
    Abstract [en]

    Context-centric applications and services are premised on the ability to readily respond to changes in context. Centralized approaches to enabling this are undermined by their dependencies on DNS naming services while decentralized approaches using DHT variants have been centred on the provisioning of the underlying context information, creating information-centric rather than context-centric solutions. A dynamic Internet of Things mandates a new paradigm; approaches storing, discovering and associating context entities relevant to their context state. In this paper, we explore such a paradigm, and with the implementation of a prototype, show the advantages of moving towards the notion of context-state centricity on the Internet of Things.

  • 4891. Walters, Jamie
    et al.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Evolving Presentity-Based Context Schemas by Estimating Context Proximity2011Konferensbidrag (Refereegranskat)
  • 4892. Walters, Jamie
    et al.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Norling, Roger
    Distributed Context Models in Support of Ubiquitous Mobile Awareness Services2010Konferensbidrag (Refereegranskat)
  • 4893.
    Walters, Jamie
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rahmani, Rahim
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    A Relational Context Proximity Query Language2015Ingår i: Mobile Networks and Management: Revised Selected Papers / [ed] Ramón Agüero et al., Berlin: Springer, 2015, nr 1, s. 277-289Konferensbidrag (Refereegranskat)
    Abstract [en]

    The creation of applications and services realising massive immersive participation require the provisioning of current, relevant and accurate context information. These applications benefit from access to this highly dynamic information in real time. Existing approaches to provisioning context information are limited by their interpretation of context relationships as address book solutions thus limiting the discovering of related entities. We introduce the context proximity query language (CPQL) for querying context related entities on distributed across collections of remote endpoints. As a declarative query language (CPQL) is similar in structure to SQL and describes the relationships between entities as distance functions between their associated context information. We simulate CPQL and show that it offers improvements over existing approaches while scaling well.

  • 4894.
    Walters, Jamie
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rahmani, Rahim
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Adaptive Information Provisioning in Distributed Context Centric Architectures2014Ingår i: International Journal of Computer Science Issues, ISSN 1694-0784, E-ISSN 1694-0814, Vol. 11, nr 4, s. 10-21Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The provisioning of user context information between service endpoints is central to realizing massive immersive participation on an Internet of Things. This information must in turn be provisioned to endpoints with minimal overhead costs. Where this is achieved through centralized repositories of context information there arises issues of scalability and availability. Where distributed approaches have been proposed, information dissemination has been optimized relative to the underlying network properties. In this paper we extend the Distributed Context Protocol (DCXP) to support subscriptions relative to an entity-application-entity triple, minimizing the number of subscriptions required and through application specific optimization minimize the overall cost of delivering user context information to service endpoints.

  • 4895.
    Walters, Jamie
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rahmani, Rahim
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Establishing Multi-Criteria Context Relations Supporting Ubiquitous Immersive Participation2013Ingår i: International Journal of Ad Hoc, Sensor & Ubiquitous Computing, ISSN 0976-2205, E-ISSN 0976-1764, Vol. 4, nr 2, s. 59-78Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Immersive Participationentails massive participatory activities in the Internetengaging people, places and objects. This ispremised on the existence of an Internet of Things infrastructure supporting applications and services with the same richness of experience as the World Wide Web. This in turn presupposes the existence of models for establishing and maintaining context relations. Where these models do exist, they impose a limited interpretation of context relations in the presence of the inherent heterogeneous and dynamic characteristics of the supporting information. In this paper we introduce an approach towards establishing context relations through the use of an improved context relational model permitting a wider, more complete range of application specific scenarios. Additionally, wederive a measure of context proximity that considers the situation, attributes, relations, accuracy and heterogeneity of both the underlying information and the vast array of requirements for metrics supporting application problem domains

  • 4896.
    Walters, Jamie
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Rahmani, Rahim
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Supporting Context-Centric Relationships in Heterogeneous Environments2013Ingår i: International Journal of Computer Science Issues, ISSN 1694-0784, E-ISSN 1694-0814, Vol. 10, nr 5, s. 25-34Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Massive Immersive Participation is enriched through the use of context information describing the dynamic states and relations among people places and things. This in turn mandates the creation of methods and models for establishing and supporting these relationships. Previous approaches are undermined by their limited interpretation of context centric relations and subsequently do not offer support for multi-criteria relationships. In this paper, we extend on our previous work on establishing multi-criteria context relationships, to adding the support required for maintaining these relationships over heterogeneous and dynamic context information. We introduce a query language that supports an extended publish-subscribe approach and define solutions for maintaining, evaluating and adjusting these relationships while minimizing overall costs.

  • 4897. Walters, Jamie
    et al.
    Kanter, Theo
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Savioli, Enrico
    A Distributed Framework for Organizing an Internet of Things2011Ingår i: The 3rd International ICST Conference on Mobile Lightweight Wireless Systems, 2011Konferensbidrag (Refereegranskat)
  • 4898.
    Wang, Chao
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsteori. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Fan, Y.
    Thompson, J. S.
    Skoglund, Mikael
    KTH, Skolan för elektro- och systemteknik (EES), Kommunikationsteori. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
    Poor, H. V.
    Shifted successive decode-and-forward relaying: Towards the optimal diversity-multiplexing tradeoff for a four-node cooperative network2010Ingår i: IEEE International Conference on Communications, 2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, a novel cooperative diversity transmission protocol is proposed for a four-node network where a single-antenna source communicates with its intended Nantenna destination with the help of two K-antenna decode-and-forward (DF) relays. Without requiring complex coding strategies at the relays, a sufficiently strong or weak inter-relay channel, or destination-source feedback, the proposed shifted successive DF relaying (SSDFR) protocol asymptotically achieves the optimal diversity-multiplexing tradeoff performance the four-node network can provide.

  • 4899.
    Wang, Jinhuan
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.).
    Cheng, Daizhan
    Hu, Xiaoming
    KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Optimeringslära och systemteori. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre. KTH, Skolan för datavetenskap och kommunikation (CSC), Centra, Centrum för Autonoma System, CAS.
    An extension of LaSalle's Invariance Principle for a class of switched linear systems2009Ingår i: Systems & control letters (Print), ISSN 0167-6911, E-ISSN 1872-7956, Vol. 58, nr 10-11, s. 754-758Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper LaSalle's Invariance Principle for switched linear systems is studied. Unlike most existing results in which each switching mode in the system needs to be asymptotically stable, in this paper the switching modes are allowed to be only Lyapunov stable. Under certain ergodicity assumptions, an extension of LaSalle's Invariance Principle for global asymptotic stability of switched linear systems is proposed provided that the kernels of derivatives of a common quadratic Lyapunov function with respect to the switching modes are disjoint (except the origin).

  • 4900.
    Wang, Jinyi
    et al.
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Juhlin, Oskar
    Stockholms universitet, Samhällsvetenskapliga fakulteten, Institutionen för data- och systemvetenskap.
    Banka Johnson, Eva-Carin
    Previsualization with Computer Animation (Previs): Communicating Research to Interaction Design Practice2014Ingår i: Proceedings of the 26th Australian Computer-Human Interaction Conference on Designing Futures: the Future of Design, Association for Computing Machinery (ACM), 2014, s. 11-20Konferensbidrag (Refereegranskat)
    Abstract [en]

    In recent years there has been growing concern about a gap between HCI research and industrial practitioners. We review methods proposed in HCI for enhancing communication between researchers and designers, and propose previsualization animation, borrowed from the movie industry, as an additional means to support this communication. The potential benefit is investigated through a process of designing and producing an animated film for a design research project at a furniture company and gathering initial user feedback. We argue that a technique that accounts for interaction dynamics and provisionality and that supports brevity and mobility can communicate design research in an inspirational manner to practitioners. However we also identified a remaining difference in the two groups' expectations about the animation, with researchers wanting it to be more research-like and practitioners wanting it to be more production-oriented.

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