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  • Panarotto, Massimo
    et al.
    Chalmers University of Technology, SWE.
    Bertoni, Marco
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Johansson, Christian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Using models as boundary objects in early design negotiations: analysis and implications for decision support systems2020In: Journal of Design Research, ISSN 1748-3050, E-ISSN 1569-1551, Journal of Design Research, no 2/3/4, p. 214-237Article in journal (Refereed)
    Abstract [en]

    One common strategy to include more downstream lifecycle dimensions in early design is to enrich modelling and simulation techniques embedded in decision support systems. However, downstream dimensions are difficult to trade against more traditional engineering objectives. This research studied through individual interviews how six disciplines use models to negotiate design trade-offs. References to models were categorised according to whether models supported or hampered the duration of trade-off identification and how they impacted the duration of trade-off resolution. The results point to the difficulty of applying downstream lifecycle issues earlier in the design process because of the characteristics of the models that are used. A list of characteristics promoting and limiting the use of four models as boundary objects (CAD models, simulation results, total cost of ownership and decision matrices) is provided. The cross-analysis of these characteristics provides insights into how models need to be organised in decision support systems.

  • Linde, Peter
    Blekinge Institute of Technology, The Library.
    BTH Newsletter on Science Publishing and Open Access Issues: March 20202020Other (Other (popular science, discussion, etc.))
  • Yasin, Affan
    et al.
    Tsinghua University, CHN.
    Fatima, Rubia
    Tsinghua University, CHN.
    Wen, Lijie
    Tsinghua University, CHN.
    Afzal, Wasif
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering. Mälardalens högskola, SWE.
    Azhar, Muhammad
     Shenzhen University, CHN.
    Torkar, Richard
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering. Gothenburg University, SWE.
    On using grey literature and google scholar in systematic literature reviews in software engineering2020In: IEEE Access, E-ISSN 2169-3536, Vol. 8, p. 36226-36243, article id 8984351Article in journal (Refereed)
    Abstract [en]

    Context: The inclusion of grey literature (GL) is important to remove publication bias while gathering available evidence regarding a certain topic. The number of systematic literature reviews (SLRs) in Software Engineering (SE) is increasing but we do not know about the extent of GL usage in these SLRs. Moreover, Google Scholar is rapidly becoming a search engine of choice for many researchers but the extent to which it can find the primary studies is not known. Objective: This tertiary study is an attempt to i) measure the usage of GL in SLRs in SE. Furthermore this study proposes strategies for categorizing GL and a quality checklist to use for GL in future SLRs; ii) explore if it is feasible to use only Google Scholar for finding scholarly articles for academic research. Method: We have conducted a systematic mapping study to measure the extent of GL usage in SE SLRs as well as to measure the feasibility of finding primary studies using Google Scholar. Results and conclusions: a) Grey Literature: 76.09% SLRs (105 out of 138) in SE have included one or more GL studies as primary studies. Among total primary studies across all SLRs (6307), 582 are classified as GL, making the frequency of GL citing as 9.23%. The intensity of GL use indicate that each SLR contains 5 primary studies on average (total intensity of GL use being 5.54). The ranking of GL tells us that conference papers are the most used form 43.3% followed by technical reports 28.52%. Universities, research institutes, labs and scientific societies together make up 67.7% of GL used, indicating that these are useful sources for searching GL. We additionally propose strategies for categorizing GL and criteria for evaluating GL quality, which can become a basis for more detailed guidelines for including GL in future SLRs. b) Google Scholar Results: The results show that Google Scholar was able to retrieve 96% of primary studies of these SLRs. Most of the primary studies that were not found using Google Scholar were from grey sources. © 2013 IEEE.

  • Šmite, Darja
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Moe, Nils Brede
    SINTEF Foundation for Scientific and Industrial Research, NOR.
    Floryan, Marcin
    Spotify Limited, USA.
    Levinta, Georgiana
    Spotify Limited, USA.
    Chatzipetrou, Panagiota
    Örebro Universitet, SWE.
    Spotify guilds2020In: Communications of the ACM, ISSN 0001-0782, E-ISSN 1557-7317, Vol. 63, no 3, p. 58-61Article in journal (Refereed)
  • Friedewald, Michael
    et al.
    Fraunhofer ISI, GER.
    Önen, MelekEURECOM, FRA.Lievens, EvaGhent University, BEL.Krenn, StephanAustrian Institute of Technology, AUT.Fricker, SamuelBlekinge Institute of Technology, Faculty of Computing, Department of Software Engineering. FHNW, CHE.
    Privacy and Identity Management: Data for Better Living: AI and Privacy2019Collection (editor) (Refereed)
    Abstract [en]

    This book contains selected papers presented at the 14th IFIP WG 9.2, 9.6/11.7, 11.6/SIG 9.2.2 International Summer School on Privacy and Identity Management, held in Windisch, Switzerland, in August 2019.

    The 22 full papers included in this volume were carefully reviewed and selected from 31 submissions. Also included are reviewed papers summarizing the results of workshops and tutorials that were held at the Summer School as well as papers contributed by several of the invited speakers. The papers combine interdisciplinary approaches to bring together a host of perspectives, which are reflected in the topical sections: language and privacy; law, ethics and AI; biometrics and privacy; tools supporting data protection compliance; privacy classification and security assessment; privacy enhancing technologies in specific contexts.

  • Nord, Catharina
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    Byerley, Andrew
    Stockholms universitet, SWE.
    Translocal Optimisation: Assembling Rural and Urban Spaces for Later Life in Urban Namibia and Uganda2020In: Journal of Southern African Studies, ISSN 0305-7070, E-ISSN 1465-3893, Vol. 46, no 1, p. 109-127Article in journal (Refereed)
    Abstract [en]

    It is often assumed that sub-Saharan African urban migrants return in later life to the villages from which they originated. This article challenges this model of circular migration by exploring the strategies of older adults who live permanently in urban areas. The empirical material comes from ethnographic case studies in two industrial towns formed by the apartheid and colonial housing policies of the 1950s and 1960s: Kuisebmond in Walvis Bay, Namibia, a former apartheid ‘location’; and Walukuba in Jinja, Uganda, a former ‘African’ rental estate. Older adults’ housing situation and its significance for their strategies and choices in later life provide the focus. The results show that even if many strategies appeared that are often associated with a return to the rural place of origin, for many the move back to the village was not a viable option. Participants in the study nurtured contacts with their places of origin, for example by making regular visits, sending remittances, contributing to housing in the village and receiving relatives in town. It is argued that these strategies, together with urban advantages–in particular a good housing situation–must be understood as translocal optimisation, in which potentialities emerge from an assemblage of various actors in different, connected locales. The optimal situation in which to age–in rural or urban areas–is a product of co-emergent actors and not necessarily an individual choice on the part of the older adult. The study concludes that urban living in later life seems to be an alternative choice for a group of older adults and must be acknowledged. © 2020, © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

  • Shahmardani, Mahdieh
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Vajragupta, Napat
    Ruhr-Universität Bochum, DEU.
    Hartmaier, Alexander
    Ruhr-Universität Bochum, DEU.
    Robust optimization scheme for inverse method for crystal plasticity model parametrization2020In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 13, no 3, article id 735Article in journal (Refereed)
    Abstract [en]

    A bottom-up material modeling based on a nonlocal crystal plasticity model requires information of a large set of physical and phenomenological parameters. Because of the many material parameters, it is inherently difficult to determine the nonlocal crystal plasticity parameters. Therefore, a robust method is proposed to parameterize the nonlocal crystal plasticity model of a body-centered cubic (BCC) material by combining a nanoindentation test and inverse analysis. Nanoindentation tests returned the load-displacement curve and surface imprint of the considered sample. The inverse analysis is developed based on trust-region-reflective algorithm, which is the most robust optimization algorithm for the considered non-convex problem. The discrepancy function is defined to minimize both the load-displacement curves and the surface topologies of the considered material under applying varied indentation forces obtained from numerical models and experimental output. The numerical model results based on the identified material properties show good agreement with the experimental output. Finally, a sensitivity analysis performed changing the nonlocal crystal plasticity parameters in a predefined range emphasized that the geometrical factor has the most significant influence on the load-displacement curve and surface imprint parameters. © 2020 by the authors.

  • Shirinbab, Sogand
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Lundberg, Lars
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Casalicchio, Emiliano
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Performance evaluation of containers and virtual machines when running Cassandra workload concurrently2020In: Concurrency and Computation, ISSN 1532-0626, E-ISSN 1532-0634, article id e5693Article in journal (Refereed)
    Abstract [en]

    NoSQL distributed databases are often used as Big Data platforms. To provide efficient resource sharing and cost effectiveness, such distributed databases typically run concurrently on a virtualized infrastructure that could be implemented using hypervisor-based virtualization or container-based virtualization. Hypervisor-based virtualization is a mature technology but imposes overhead on CPU, networking, and disk. Recently, by sharing the operating system resources and simplifying the deployment of applications, container-based virtualization is getting more popular. This article presents a performance comparison between multiple instances of VMware VMs and Docker containers running concurrently. Our workload models a real-world Big Data Apache Cassandra application from Ericsson. As a baseline, we evaluated the performance of Cassandra when running on the nonvirtualized physical infrastructure. Our study shows that Docker has lower overhead compared with VMware; the performance on the container-based infrastructure was as good as on the nonvirtualized. Our performance evaluations also show that running multiple instances of a Cassandra database concurrently affected the performance of read and write operations differently; for both VMware and Docker, the maximum number of read operations was reduced when we ran several instances concurrently, whereas the maximum number of write operations increased when we ran instances concurrently.

  • Abghari, Shahrooz
    et al.
    Boeva, Veselka
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Brage, Jens
    NODA Intelligent Systems AB, SWE.
    Johansson, Christian
    NODA Intelligent Systems AB, SWE.
    Grahn, Håkan
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Lavesson, Niklas
    J önk öping University, SWE.
    Higher order mining for monitoring district heating substations2019In: Proceedings - 2019 IEEE International Conference on Data Science and Advanced Analytics, DSAA 2019, Institute of Electrical and Electronics Engineers Inc. , 2019, p. 382-391Conference paper (Refereed)
    Abstract [en]

    We propose a higher order mining (HOM) approach for modelling, monitoring and analyzing district heating (DH) substations' operational behaviour and performance. HOM is concerned with mining over patterns rather than primary or raw data. The proposed approach uses a combination of different data analysis techniques such as sequential pattern mining, clustering analysis, consensus clustering and minimum spanning tree (MST). Initially, a substation's operational behaviour is modeled by extracting weekly patterns and performing clustering analysis. The substation's performance is monitored by assessing its modeled behaviour for every two consecutive weeks. In case some significant difference is observed, further analysis is performed by integrating the built models into a consensus clustering and applying an MST for identifying deviating behaviours. The results of the study show that our method is robust for detecting deviating and sub-optimal behaviours of DH substations. In addition, the proposed method can facilitate domain experts in the interpretation and understanding of the substations' behaviour and performance by providing different data analysis and visualization techniques. © 2019 IEEE.

  • Fredriksson, Henrik
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Dahl, Mattias
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Holmgren, Johan
    Malmö Högskola, SWE.
    Optimal placement of charging stations for electric vehicles in large-scale transportation networks2019In: Procedia Computer Science, Elsevier B.V. , 2019, Vol. 160, p. 77-84Conference paper (Refereed)
    Abstract [en]

    This paper presents a new practical approach to optimally allocate charging stations in large-scale transportation networks for electric vehicles (EVs). The problem is of particular importance to meet the charging demand of the growing fleet of alternative fuel vehicles. Considering the limited driving range of EVs, there is need to supply EV owners with accessible charging stations to reduce their range anxiety. The aim of the Route Node Coverage (RNC) problem, which is considered in the current paper, is to find the minimum number of charging stations, and their locations in order to cover the most probable routes in a transportation network. We propose an iterative approximation technique for RNC, where the associated Integer Problem (IP) is solved by exploiting a probabilistic random walk route selection, and thereby taking advantage of the numerical stability and efficiency of the standard IP software packages. Furthermore, our iterative RNC optimization procedure is both pertinent and straightforward to implement in computer coding and the design technique is therefore highly applicable. The proposed optimization technique is applied on the Sioux-Falls test transportation network, and in a large-scale case study covering the southern part of Sweden, where the focus is on reaching the maximum coverage with a minimum number of charging stations. The results are promising and show that the flexibility, smart route selection, and numerical efficiency of the proposed design technique, can pick out strategic locations for charging stations from thousands of possible locations w ithout numerical difficulties. ©2019 Hie Authors. Published by Elsevier B.V.

  • Chowdhery, Syed Azad
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Bertoni, Marco
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Wall, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Larsson, Tobias
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    A data-driven design framework for early stage PSS design explorationIn: Design Science, ISSN 2053-4701Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Ubiquitous and pervasive computing holds great potential in the domain of Product-Service Systems to introduce a model-driven paradigm for decision support. Data-driven design is often discussed as a critical enabler for developing simulation models that comprehensively explore the PSS design space for complex systems, linking of performances to customer and provider value. Emerging from the findings of two empirical studies conducted in collaboration with multinational manufacturing companies in the business-to-business market, this paper defines a data-driven framework to support engineering teams in exploring, early in the design process, the available design space for Product-Service Systems from a value perspective. Verification activities show that the framework and modeling approach is considered to fill a gap when it comes to stimulating value discussions across functions and organizational roles, as well as to grow a clearer picture of how different disciplines contribute to the creation of value for new solutions.

  • Olofsdotter Bergström, Annika
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Ta plats: Plats-specifika spel i dialog med feministisk teknovetenskap2020Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The starting point of this dissertation is to examine how playing which stems from players’ physical bodies and public spaces can be meaningful in the everyday lives of cities. I will be assuming that the physical location and the player’s body earn too little attention in site-specific games. In this dissertation work I have merged site-specific games and feminist technoscience to be able to observe the outcome of that union. Feminist technoscience contributes to the development of a game/play design in which the senses of the players respond to and touch their surroundings to aid in a repositioning of habitual behavior into exploratory playing actions. My work involves whatthe meaning of materialism can be to game/play design; the surfaces of places, light conditions, objects and shapes, as well as the perceptions, norms and customs which are of importance to players and their choices, requests, deeds, and struggles. Together, public spaces and players create the game/play design and renegotiate the role of the material in relation to site-specific playing. My research contributes to the field often known as ‘playable cities’. The intention is to develop a critical game/playdesign which acknowledges the complexity of cities and human activities within them. Game/play design methods informed by everyday practices and objects ‘at hand’ in my work assist designs for site-specific games. The enabling of movement possibilities via games and diversion poses questions of how and for what humans use public spaces. Empirically, this study consists of three site-specific games which I designed in different locations with different groups of female players. In the dissertation I developwhat I call playingdesign. This means that the players play and design the practice of playing simultaneously. A feminist technoscientific playingdesignis, in this dissertation, about researching a world that seems structured and regulated but can be proven flexible and intricate through playing. It is a playingdesign that not only plays with what is established in everyday places but also tries to find and nurture the unexpected. A feminist technoscientific playingdesign is a methodology to create playful acts in order to resist that which tends to become overly conventional or standardized in the lives and conduct of people in cities.

  • Berglund Snodgrass, Lina
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Spatial Planning.
    Mukhtar-Landgren, Dalia
    Department of Political Science, Lund University, SWE.
    Conceptualizing Testbed Planning: Urban Planning in the Intersection between Experimental and Public Sector Logic2020In: Urban planning, ISSN 2183-7635, Vol. 5, no 1, p. 96-106Article in journal (Refereed)
    Abstract [en]

     Urban planning is, in many countries, increasingly becoming intertwined with local climate ambitions, investments in urban attractiveness and “smart city” innovation measures. In the intersection between these trends, urban experimentation has developed as a process where actors are granted action space to test innovations in a collaborative setting. One arena for urban experimentation is urban testbeds. Testbeds are sites of urban development, in which experimentation constitutes an integral part of planning and developing the area. This article introduces the notion of testbed planning as a way to conceptualize planning processes in delimited sites where planning is combined with processes of urban experimentation. We define testbed planning as a multi-actor, collaborative planning process in a delimited area, with the ambition to generate and disseminate learning while simultaneously developing the site. The aim of this article is to explore processes of testbed planning with regard to the role of urban planners. Using an institutional logics perspective we conceptualize planners as navigating between a public sector—and an experimental logic. The public sector logic constitutes the formal structure of “traditional” urban planning, and the experimental logic a collaborative and testing governance structure. Using examples from three Nordic municipalities, this article explores planning roles in experiments with autonomous buses in testbeds. The analysis shows that planners negotiate these logics in three different ways, combining and merging them, separating and moving between them or acting within a conflictual process where the public sector logic dominates.

  • Barlo, Alexander
    et al.
    Volvo, SWE.
    Sigvant, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Endelt, Benny
    Aalborg Universitet, DEN.
    On the Failure Prediction of Dual-Phase Steel and Aluminium Alloys Exposed to Combined Tension and Bending2019In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, Vol. 651, no 1, article id 012030Conference paper (Refereed)
    Abstract [en]

    The interest in accurate prediction of failure of sheet metals in the automotive industry has increased significantly over the last two decades. This paper aims to evaluate two failure prediction approaches implemented in the commercial Finite Element code AutoFormplus R7.04; (i) the standard Forming Limit Diagram (FLD), and (ii) the Non-linear Forming Limit Diagram. The evaluation will be testing the two approaches accuracy on predicting failure of both an AA6016 aluminium alloy and a CR440Y780T-DP dual-phase steel alloy specimen exposed to combined tension and bending. Based on the findings of this study, it is concluded that neither of the evaluated approaches is able to accurately predict failure in both cases presented. © Published under licence by IOP Publishing Ltd.

  • Chezan, A. R.
    et al.
    Tata Steel Europe Limited, GBR.
    Khandeparkar, Tushar V.
    Tata Steel Europe Limited, GBR.
    Ten Horn, Carel H. L. J.
    Tata Steel Europe Limited, GBR.
    Sigvant, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Accurate sheet metal forming modeling for cost effective automotive part production2019In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing , 2019, no 1Conference paper (Refereed)
    Abstract [en]

    Recent implementations of accurate material and tribology models in finite element codes for sheet metal forming process development have the potential to reduce development time and the associated development costs significantly. Adoption of new models requires validated material parameters and assessments of the overall accuracy. The paper presents a study aimed at accuracy estimation by comparing strain measurements and finite element simulation results for a laboratory flat bottom hole expansion test and an industrial automotive component produced at Volvo Cars. The use of the tensile test based Tata Steel Vegter yield locus model results in accurate prediction of dimensions and plastic deformation distribution in sheet metal forming applications. © Published under licence by IOP Publishing Ltd.