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  • Skär, Lisa
    Luleå tekniska universitet, Omvårdnad.
    Barn och ungdomar med rörelsehinder: deras uppfattningar om roller, relationer och aktiviteter2002Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The general aim of this thesis was to describe how children and adolescents with restricted mobility perceived their roles, relations and activities in relation to peers and adults in different settings. The thesis includes six sub-studies, which are based on interviews, observations and field notes with children and adolescents with restricted mobility aged from 6 to 19 years. Using Bronfenbrenner’s theory “the Ecology of Human Development” as the main theoretical framework, the ambition was to understand the children and adolescents’ social world from their perspective. The principal finding was the lack of peers in the children and adolescents’ social network. Furthermore, this tendency of isolation from peers was found to increase during the transition from childhood to adolescence. Their relationships to peers were strained and activities and surroundings in which social contacts could develop were limited. The relationships with peers were also characterised by social barriers in the form of attitudes that resulted in social isolation from the group of persons the disabled children and adolescents most wished to be with. When relations to peers were limited, the disabled children’s social life was restricted to adults. The results further showed that the children and adolescents’ roles and relations often were significantly different from their peers. The children and adolescents’ arrived at a concept of themselves that differed from the way others conceptually saw them. Furthermore, the children and adolescents saw themselves as regular members of their peer group, but the other members of the peer group saw them as different from themselves. Relationships to friends of the same age either were confined or were nonexistent. Relationships to adults were often characterised as ambivalent or asymmetric, i.e. the adults were helpful and supportive while over protective and dominant at the same time. The thesis revealed that, despite the many obstacles facing them, the children and adolescents with restricted mobility had a positive view of their future.

  • Skär, Lisa
    et al.
    Luleå tekniska universitet, Omvårdnad.
    Söderberg, Siv
    Luleå tekniska universitet, Omvårdnad.
    Meenings of feeling well for women with MS2011Conference paper (Other academic)
  • Stridsman, Caroline
    et al.
    Luleå tekniska universitet, Institutionen för hälsovetenskap.
    Skär, Lisa
    Luleå tekniska universitet, Omvårdnad.
    Hedman, Linnea
    Luleå tekniska universitet, Omvårdnad.
    Lindberg, Anne
    Fatigue and decreased health can predict mortality in COPD2013Conference paper (Other academic)
  • Söderberg, Siv
    et al.
    Luleå tekniska universitet, Omvårdnad.
    Skär, Lisa
    Luleå tekniska universitet, Omvårdnad.
    Information and communication technology as a complement to nursing care at home2011Conference paper (Other academic)
  • Söderberg, Siv
    et al.
    Luleå tekniska universitet, Omvårdnad.
    Skär, Lisa
    Luleå tekniska universitet.
    Information and communication technology as a tool to increase accessibility to care2009In: Assistive Technology from Adapted Equipment to Inclusive Environments: AAATE 2009 / [ed] P.L. Emiliani; L. Burzagli; A. Como; F. Gabbanini; A-L Salminen, IOS Press , 2009, 864- p.Conference paper (Other academic)
  • Isaksson, Gunilla
    et al.
    Luleå tekniska universitet, Hälsa och rehabilitering.
    Josephsson, Staffan
    Karolinska institute, Neurobiology Care Sciences and Society, Division of Occupational Therapy.
    Lexell, Jan
    Luleå tekniska universitet, Institutionen för hälsovetenskap.
    Skär, Lisa
    Luleå tekniska universitet, Omvårdnad.
    Men's experiences of giving and taking social support after their wife's spinal cord injury2008In: Scandinavian Journal of Occupational Therapy, ISSN 1103-8128, E-ISSN 1651-2014, Vol. 15, no 4, 236-246 p.Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to gain an understanding of how men living with women with spinal cord injury (SCI) experienced and acted when they were giving and taking social support to and from their wives and other persons in their social network. Another aim was to give some possible explanations of the complex process of change that they went through. Data were collected through in-depth interviews with four men and field notes. To describe the men's subjective experiences and the process of change, a narrative approach inspired by Polkinghorne was used. The analyses resulted in one story that included the four men's experiences and action. The story showed that when the men went through a process of change, they used and needed both emotional and practical support to handle their new life situation. Furthermore, the men's experiences and action against social support changed over time. This indicated that, through narratives from spouses, professionals within rehabilitation could understand the process of change they went through after their partner's sudden injury, and support them to find strategies to handle their changed life situation. To give some possible explanations for the men's experiences and action during the process of change, the findings are discussed in relation to theories concerning adaptation and coping

  • Juuso, Päivi
    et al.
    Luleå tekniska universitet, Omvårdnad.
    Skär, Lisa
    Luleå tekniska universitet, Omvårdnad.
    Olsson, Malin
    Luleå tekniska universitet, Omvårdnad.
    Söderberg, Siv
    Luleå tekniska universitet, Omvårdnad.
    Living with a double burden: Meanings of pain for women with fibromyalgia2011In: International Journal of Qualitative Studies on Health and Well-being, ISSN 1748-2623, E-ISSN 1748-2631, Vol. 6, no 3Article in journal (Refereed)
    Abstract [en]

    Living with fibromyalgia (FM) means living with a chronic pain condition that greatly influences daily life. The majority of people with FM are middle-aged women. The aim of this study was to elucidate meanings of pain for women with FM. Fifteen women with FM were interviewed about their pain experiences and a phenomenological hermeneutic interpretation was used to analyse the interview texts. The findings show that meanings of pain for women with FM can be understood as living with a double burden; living with an aggressive, unpredictable pain and being doubted by others in relation to the invisible pain. The ever-present pain was described as unbearable, overwhelming, and dominated the women’s whole existence. Nevertheless, all the women tried to normalize life by doing daily chores in an attempt to alleviate the pain. In order to support the women’s needs and help them to feel well despite their pain, it is important that nurses and health care personnel acknowledge and understand women with FM and their pain experiences.

  • Nilsson, Carina
    et al.
    Luleå tekniska universitet, Omvårdnad.
    Skär, Lisa
    Luleå tekniska universitet, Omvårdnad.
    Söderberg, Siv
    Swedish district nurses' attitudes to implement information and communication technology in home nursing2008In: Open Nursing Journal, ISSN 1874-4346, E-ISSN 1874-4346, Vol. 2, 68-72 p.Article in journal (Refereed)
    Abstract [en]

    The use of information and communication technology has increased in the society, and can be useful in nursing care. The aim of this study was to describe district nurses' attitudes regarding the implementation of information and communication technology in home nursing. The first and third authors performed five focus group discussions with 19 district nurses' from five primary healthcare centres in northern Sweden. During the focus group discussions, the following topics were discussed: the current and future use of information and communication technology in home nursing; expectations, advantages, disadvantages and hindrances in the use of information and communication technology in home nursing; and the use of information and communication technology from an ethical perspective. The transcribed focus group discussions were analysed using qualitative content analysis. The results showed that district nurses' attitudes were positive regarding the use of information and communication technology in their work. They also asked for possibilities to influence the design and its introduction. However, the use of information and communication technology in home nursing can be described as a complement to communication that could not replace human physical encounters. Improvements and risks, as well as the importance of physical presence in home nursing were considered vital. The results revealed that the use of information and communication technology requires changes in the district nurses' work situation.

  • Public defence: 2017-06-01 14:37 J1630, Karlskrona
    Ghazi, Ahmad Nauman
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Structuring Exploratory Testing through Test Charter Design and Decision Support2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Context: Exploratory testing (ET) is an approach to test software with a strong focus on personal skills and freedom of the tester. ET emphasises the simultaneous design and execution of tests with minimal test documentation. Test practitioners often claim that their choice to use ET as an important alternative to scripted testing is based on several benefits ET exhibits over the scripted testing. However, these claims lack empirical evidence as there is little research done in this area. Moreover, ET is usually considered an ad-hoc way of doing testing as everyone does it differently. There have been some attempts in past to provide structure to ET. Session based test management (SBTM) is an approach that attempts to provide some structure to ET and gives some basic guidelines to structuring the test sessions. However, these guidelines are still very abstract and are very open to individuals' interpretation.

    Objective: The main objective of this doctoral thesis is to support practitioners in their decisions about choosing exploratory versus scripted testing. Furthermore, it is also aimed to investigate the empirical evidence in support of ET and find ways to structure ET and classify different levels of exploration that drive the choices made by exploratory testers. Another objective of this thesis is to provide a decision support system to select levels of exploration in overall test process.

    Method: The findings presented in this thesis are obtained through a controlled experiment with participants from industry and academia, exploratory surveys, interviews and focus groups conducted at different companies including Ericsson AB, Sony Mobile Communications, Axis Communications AB and Softhouse Consulting Baltic AB.

    Results: Using the exploratory survey, we found three test techniques to be most relevant in context of testing software systems and in particular heterogeneous systems. The most frequently used technique mentioned by the practitioners is ET which is not a much researched topic. We also found many interesting claims about ET in grey literature produced by practitioners in the form of informal presentations and blogs but these claims lacked any empirical evidence. Therefore, a controlled experiment was conducted with students and industry practitioners to compare ET with scripted testing. The experiment results show that ET detects significantly more critical defects compared to scripted testing and is more time efficient. However, ET has its own limitations and there is not a single way to use it for testing. In order to provide structure to ET, we conducted a study where we propose checklists to support test charter design in ET. Furthermore, two more industrial focus group studies at four companies were conducted that resulted in a taxonomy of exploration levels in ET and a decision support method for selecting exploration levels in ET. Lastly, we investigated different problems that researchers face when conducting surveys in software engineering and have presented mitigation strategies for these problems.

    Conclusion: The taxonomy for levels of exploration in ET, proposed in this thesis, provided test practitioners at the companies a better understanding of the underlying concepts of ET and a way to structure their test charters. A number of influence factors elicited as part of this thesis also help them prioritise which level of exploration suits more to their testing in the context of their products. Furthermore, the decision support method provided the practitioners to reconsider their current test focus to test their products in a more effective way.

  • Ny, Henrik
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Borén, Sven
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Nurhadi, Lisiana
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Schulte, Jesko
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Robèrt, Karl Henrik
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Broman, Göran
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Vägval 2030: Färdplan för snabbomställning till hållbara persontransporter - kortversionen2017Report (Other academic)
    Abstract [sv]

    Transportsektorns beroende av fossila bränslen är en av de största utmaningarna ien omställning till ett klimatneutralt och hållbart samhälle.

    Denna färdplansrapport syftar till att undersöka hur elfordonssystem kan bidra tillen snabbomställning till hållbara persontransporter i Småland och Blekinge, samttill att presentera en metodik för vägledning av liknande snabbomställningsarbetei andra regioner och samhällssektorer.

    Detta arbete har övergripande vägletts av en vetenskapligt framtagen och beprövadmetodik för strategisk hållbar utveckling (eng. Framework for Strategic SustainableDevelopment – FSSD). Specifikt ges svar på fyra forskningsfrågor som struktureras irelation till de fyra delsystemen ’Politik och styrmedel’, ’Användare och marknad’,’Fordon och infrastruktur’ samt ’Energi och material’:

    1. Hur skulle en hållbar vision för persontransporter i Småland och Blekinge kunnase ut?

    2. Hur skulle ett etappmål för år 2030 kunna se ut?

    3. Hur ser nuläget ut i förhållande till 2030-målet och visionen?

    4. Hur skulle gapet mellan nuläget, 2030-målet och visionen kunna överbryggas?

    Rapportens resultat visar att dagens fokus på fossilfrihet och klimatåtgärder måstebreddas till hela hållbarhetsfrågan så att även andra hållbarhetsproblemadresseras och så att inte lösningar på vissa hållbarhetsproblem skapar nya.

    Rapporten tydliggör också att det är nödvändigt, praktiskt möjligt och ekonomisktfördelaktigt för Sydostregionen att göra en snabbare hållbarhetsomställning avpersontransporterna än vad som har föreslagits i tidigare studier och utredningar.Det görs även troligt att detsamma gäller för hela transportsystemet och för helaSverige och världen.

    Även geopolitiska fördelar är troliga. En global övergång till transport- ochenergisystem som baseras på energi från fritt tillgängliga flödesresurser som soloch vind istället för fossila bränslen skulle därför sannolikt minska konfliktriskernai världen. Begränsade tillgångar av litium och platina som batteri- ochbränslecellselbilar är beroende av, och andra metaller som behövs till solceller ochvindkraftverk, kan dock ge motsvarande konfliktproblematik. Denna rapportsrekommendationer om minskat transportbehov och bilberoende och dess fokus påresurseffektivitet motverkar detta genom att slå mot bakomliggande resursdrivandemekanismer. Skulle denna färdplan omsättas i praktisk politik så borde alltså denkommande omställningen som ändå är på gång bli betydligt mer ’framtidssäker’.

  • Viet Thuy, Vu
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Wavelength-resolution SAR Incoherent ChangeDetection Based on Image Stack2017In: IEEE Geoscience and Remote Sensing Letters, ISSN 1545-598X, E-ISSN 1558-0571, no 99, 1-5 p.Article in journal (Refereed)
    Abstract [en]

    This letter presents a wavelength-resolution syn-thetic aperture radar incoherentchange detection method basedon image stack, i.e., there are more than one reference or/andsurveillance image. Considering image stack in statistical hypoth-esis test for change detection is expected to result into a simplemathematical expression for implementation and provide betterchange detection results. As presented in this letter, a statisticalhypothesis test is developed on bivariate Gaussian distributionfor an image stack of two reference images and one surveillanceimage. The requirement for the image stack is three imagesassociated with three measurements with no change between twoof them. A detection method with simple processing scheme isproposed. The method is experimented with 24 CARABAS datasets. The results indicate that high average detection probability,e.g., 96%, with very low false alarm rate, e.g., only 0.19/km2,is obtained with the proposal.

  • Viet Thuy, Vu
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    thomas, Sjögren
    Swedish Defence Research Agency, SWE.
    Moving Target Focusing in SAR Image withKnown Normalized Relative Speed2017In: IEEE Transactions on Aerospace and Electronic Systems, ISSN 0018-9251, E-ISSN 1557-9603, Vol. 53, no 2, 854-861 p.Article in journal (Refereed)
    Abstract [en]

    This paper presents the moving target focusing method, whichallows focusing moving targets in complex synthetic aperture radar(SAR) images without raw data. The method is developed on the rangemigration algorithm, where focusing moving target is an interpolationstep in the wave domain. The simulated results are provided in thepaper to illustrate the proposed method whereas the experimentalresults show its practicality. The method can be flexibly applied fromsmall area to the whole SAR scene.

  • Casalicchio, Emiliano
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Lundberg, Lars
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Shirinbab, Sogand
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Energy-aware Auto-scaling Algorithms for Cassandra Virtual Data Centers2017In: Cluster Computing, ISSN 1386-7857, E-ISSN 1573-7543, no MayArticle in journal (Refereed)
    Abstract [en]

    Apache Cassandra is an highly scalable and available NoSql datastore, largely used by enterprises of each size and for application areas that range from entertainment to big data analytics. Managed Cassandra service providers are emerging to hide the complexity of the installation, fine tuning and operation of Cassandra Virtual Data Centers (VDCs). This paper address the problem of energy efficient auto-scaling of Cassandra VDC in managed Cassandra data centers. We propose three energy-aware autoscaling algorithms: \texttt{Opt}, \texttt{LocalOpt} and \texttt{LocalOpt-H}. The first provides the optimal scaling decision orchestrating horizontal and vertical scaling and optimal placement. The other two are heuristics and provide sub-optimal solutions. Both orchestrate horizontal scaling and optimal placement. \texttt{LocalOpt} consider also vertical scaling. In this paper: we provide an analysis of the computational complexity of the optimal and of the heuristic auto-scaling algorithms; we discuss the issues in auto-scaling Cassandra VDC and we provide best practice for using auto-scaling algorithms; we evaluate the performance of the proposed algorithms under programmed SLA variation, surge of throughput (unexpected) and failures of physical nodes. We also compare the performance of energy-aware auto-scaling algorithms with the performance of two energy-blind auto-scaling algorithms, namely \texttt{BestFit} and \texttt{BestFit-H}. The main findings are: VDC allocation aiming at reducing the energy consumption or resource usage in general can heavily reduce the reliability of Cassandra in term of the consistency level offered. Horizontal scaling of Cassandra is very slow and make hard to manage surge of throughput. Vertical scaling is a valid alternative, but it is not supported by all the cloud infrastructures.

  • Persson, Marie
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Hvitfeldt-Forsberg, Helena
    Medical Management Centre (MMC), SWE.
    Unbeck, Maria
    Danderyds sjukhus, SWE.
    Sköldenberg, Olof Gustaf
    Danderyds sjukhus, SWE.
    Stark, Andreas
    Danderyds sjukhus, SWE.
    Kelly-Pettersson, Paula
    Danderyds sjukhus, SWE.
    Mazzocato, Pamela
    Medical Management Centre (MMC), SWE.
    Operational strategies to manage non-elective orthopaedic surgical flows: A simulation modelling study2017In: BMJ Open, ISSN 2044-6055, E-ISSN 2044-6055, Vol. 7, no 4, e013303Article in journal (Refereed)
    Abstract [en]

    Objectives To explore the value of simulation modelling in evaluating the effects of strategies to plan and schedule operating room (OR) resources aimed at reducing time to surgery for non-elective orthopaedic inpatients at a Swedish hospital. Methods We applied discrete-event simulation modelling. The model was populated with real world data from a university hospital with a strong focus on reducing waiting time to surgery for patients with hip fracture. The system modelled concerned two patient groups that share the same OR resources: hip-fracture and other non-elective orthopaedic patients in need of surgical treatment. We simulated three scenarios based on the literature and interaction with staff and managers: (1) baseline; (2) reduced turnover time between surgeries by 20â €..min and (3) one extra OR during the day, Monday to Friday. The outcome variables were waiting time to surgery and the percentage of patients who waited longer than 24â €..hours for surgery. Results The mean waiting time in hours was significantly reduced from 16.2â €..hours in scenario 1 (baseline) to 13.3â €..hours in scenario 2 and 13.6â €..hours in scenario 3 for hip-fracture surgery and from 26.0â €..hours in baseline to 18.9â €..hours in scenario 2 and 18.5â €..hours in scenario 3 for other non-elective patients. The percentage of patients who were treated within 24â €..hours significantly increased from 86.4% (baseline) to 96.1% (scenario 2) and 95.1% (scenario 3) for hip-fracture patients and from 60.2% (baseline) to 79.8% (scenario 2) and 79.8% (scenario 3) for patients with other non-elective patients. Conclusions Healthcare managers who strive to improve the timelines of non-elective orthopaedic surgeries may benefit from using simulation modelling to analyse different strategies to support their decisions. In this specific case, the simulation results showed that the reduction of surgery turnover times could yield the same results as an extra OR. © 2017 Published by the BMJ Publishing Group Limited.

  • Goswami, Prashant
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Neyret, Fabrice
    Univ. Grenoble, FRA.
    Real-time landscape-size convective clouds simulation and rendering2017In: Proceedings of Workshop on Virtual Reality Interaction and Physical Simulation, Eurographics - European Association for Computer Graphics, 2017Conference paper (Refereed)
    Abstract [en]

    This paper presents an efficient, physics-based procedural model for the real-time animation and visualization of cumulusclouds at landscape size. We couple a coarse Lagrangian model ofair parcelswith a procedural amplification using volumetricnoise. Our Lagrangian model draws an aerologyi.e.,the atmospheric physics of hydrostatic atmosphere with thermodynamicstransforms, augmented by a model of mixing between parcels and environment. In addition to the particle-particle interactions,we introduce particle-implicit environment interactions. In contrast to the usual fluid simulation, we thus do not need to samplethe transparent environment, a key property for real-time efficiency and scalability to large domains. Inheriting from the high-level physics of aerology, we also validate our simulation by comparing it to predictive diagrams, and we show how the user caneasily control key aspects of the result such as the cloud base and top altitude. Our model is thus fast, physical and controllable.

  • Ola, Spjuth
    et al.
    Karolinska Institutet, SWE.
    Andreas, Karlsson
    Karolinska Institutet, SWE.
    Mark, Clements
    Karolinska Institutet, SWE.
    Keith, Humphreys
    Karolinska Institutet, SWE.
    Emma, Ivansson
    Karolinska Institutet, SWE.
    Jim, Dowling
    Royal Institute of Technology, SWE.
    Martin, Eklund
    Karolinska Institutet, SWE.
    Alexandra, Jauhiainen
    AstraZeneca AB R&D, SWE.
    Kamila, Czene
    Karolinska Institutet, SWE.
    Henrik, Grönberg
    Karolinska Institutet, SWE.
    Pär, Sparén
    Karolinska Institutet, SWE.
    Fredrik, Wiklund
    Karolinska Institutet, SWE.
    Abbas, Cheddad
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    þorgerður, Pálsdóttir
    Nordic Information for Action e-Science Center, SWE.
    Mattias, Rantalainen
    Karolinska Institutet, SWE.
    Linda, Abrahamsson
    Karolinska Institutet, SWE.
    Erwin, Laure
    Royal Institute of Technology, SWE.
    Jan-Eric, Litton
    European Research Infrastructure Consortium, AUT.
    Juni, Palmgren
    Helsinki University, FIN.
    E-Science technologies in a workflow for personalized medicine using cancer screening as a case study2017In: JAMIA Journal of the American Medical Informatics Association, ISSN 1067-5027, E-ISSN 1527-974X, 1-8 p.Article in journal (Refereed)
    Abstract [en]

    Objective: We provide an e-Science perspective on the workflow from risk factor discovery and classification of disease to evaluation of personalized intervention programs. As case studies, we use personalized prostate and breast cancer screenings.

    Materials and Methods: We describe an e-Science initiative in Sweden, e-Science for Cancer Prevention and Control (eCPC), which supports biomarker discovery and offers decision support for personalized intervention strategies. The generic eCPC contribution is a workflow with 4 nodes applied iteratively, and the concept of e-Science signifies systematic use of tools from the mathematical, statistical, data, and computer sciences.

    Results: The eCPC workflow is illustrated through 2 case studies. For prostate cancer, an in-house personalized screening tool, the Stockholm-3 model (S3M), is presented as an alternative to prostate-specific antigen testing alone. S3M is evaluated in a trial setting and plans for rollout in the population are discussed. For breast cancer, new biomarkers based on breast density and molecular profiles are developed and the US multicenter Women Informed to Screen Depending on Measures (WISDOM) trial is referred to for evaluation. While current eCPC data management uses a traditional data warehouse model, we discuss eCPC-developed features of a coherent data integration platform.

    Discussion and Conclusion: E-Science tools are a key part of an evidence-based process for personalized medicine. This paper provides a structured workflow from data and models to evaluation of new personalized intervention strategies. The importance of multidisciplinary collaboration is emphasized. Importantly, the generic concepts of the suggested eCPC workflow are transferrable to other disease domains, although each disease will require tailored solutions.

  • Ghazi, Ahmad Nauman
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Garigapati, Ratna Pranathi
    Petersen, Kai
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Checklists to Support Test Charter Design in Exploratory Testing2017In: Agile Processes in Software Engineering and Extreme Programming / [ed] Baumeister H., Lichter H., Riebisch M., Springer, 2017, Vol. 283, 251-258 p.Conference paper (Refereed)
    Abstract [en]

    During exploratory testing sessions the tester simultaneously learns, designs and executes tests. The activity is iterative and utilizes the skills of the tester and provides flexibility and creativity. Test charters are used as a vehicle to support the testers during the testing. The aim of this study is to support practitioners in the design of test charters through checklists. We aimed to identify factors allowing practitioners to critically reflect on their designs and contents of test charters to support practitioners in making informed decisions of what to include in test charters. The factors and contents have been elicited through interviews. Overall, 30 factors and 35 content elements have been elicited.

  • Ny, Henrik
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Sven, Borén
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Lisiana, Nurhadi
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Schulte, Jesko
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Robèrt, Karl Henrik
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Broman, Göran
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Vägval 2030: färdplan för snabbomställning till hållbara persontransporter2017Report (Other academic)
    Abstract [sv]

    Transportsektorns beroende av fossila bränslen är en av de största utmaningarna ien omställning till ett klimatneutralt och hållbart samhälle.

    Denna färdplansrapport syftar till att undersöka hur elfordonssystem kan bidra tillen snabbomställning till hållbara persontransporter i Småland och Blekinge, samttill att presentera en metodik för vägledning av liknande snabbomställningsarbetei andra regioner och samhällssektorer.

    Detta arbete har övergripande vägletts av en vetenskapligt framtagen och beprövadmetodik för strategisk hållbar utveckling (eng. Framework for Strategic SustainableDevelopment – FSSD). Specifikt ges svar på fyra forskningsfrågor som struktureras irelation till de fyra delsystemen ’Politik och styrmedel’, ’Användare och marknad’,’Fordon och infrastruktur’ samt ’Energi och material’:

    1. Hur skulle en hållbar vision för persontransporter i Småland och Blekinge kunnase ut?

    2. Hur skulle ett etappmål för år 2030 kunna se ut?

    3. Hur ser nuläget ut i förhållande till 2030-målet och visionen?

    4. Hur skulle gapet mellan nuläget, 2030-målet och visionen kunna överbryggas?

    Rapportens resultat visar att dagens fokus på fossilfrihet och klimatåtgärder måstebreddas till hela hållbarhetsfrågan så att även andra hållbarhetsproblemadresseras och så att inte lösningar på vissa hållbarhetsproblem skapar nya.

    Rapporten tydliggör också att det är nödvändigt, praktiskt möjligt och ekonomisktfördelaktigt för Sydostregionen att göra en snabbare hållbarhetsomställning avpersontransporterna än vad som har föreslagits i tidigare studier och utredningar.Det görs även troligt att detsamma gäller för hela transportsystemet och för helaSverige och världen.

    Även geopolitiska fördelar är troliga. En global övergång till transport- ochenergisystem som baseras på energi från fritt tillgängliga flödesresurser som soloch vind istället för fossila bränslen skulle därför sannolikt minska konfliktriskernai världen. Begränsade tillgångar av litium och platina som batteri- ochbränslecellselbilar är beroende av, och andra metaller som behövs till solceller ochvindkraftverk, kan dock ge motsvarande konfliktproblematik. Denna rapportsrekommendationer om minskat transportbehov och bilberoende och dess fokus påresurseffektivitet motverkar detta genom att slå mot bakomliggande resursdrivandemekanismer. Skulle denna färdplan omsättas i praktisk politik så borde alltså denkommande omställningen som ändå är på gång bli betydligt mer ’framtidssäker’.

  • Pham, Phuong
    et al.
    UC Davis, USA.
    Erlandsson, Fredrik
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Wu, Felix
    UC Davis, USA.
    Social Coordinates: A Scalable Embedding Framework for Online Social Networks2017In: Proceedings of the 2017 International Conference on Machine Learning and Soft Computing, ACM Digital Library, 2017, 191-196 p.Conference paper (Refereed)
    Abstract [en]

    We present a scalable framework to embed nodes of a large social network into an Euclidean space such that the proximity between embedded points reflects the similarity between the corresponding graph nodes. Axes of the embedded space are chosen to maximize data variance so that the dimension of the embedded space is a parameter to regulate noise in data. Using recommender system as a benchmark, empirical results show that similarity derived from the embedded coordinates outperforms similarity obtained from the original graph-based measures.

  • Josyula, Sai Prashanth
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Törnquist Krasemann, Johanna
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Passenger-oriented Railway Traffic Re-scheduling: A Review of Alternative Strategies utilizing Passenger Flow Data2017Conference paper (Refereed)
    Abstract [en]

    Developing and operating seamless, attractive and efficient public transport services in a liberalized market requires significant coordination between involved actors, which is both an organizational and technical challenge. During a journey, passengers often transfer between different transport services. A delay of one train or a bus service can potentially cause the passenger to miss the transfer to the subsequent service. If those services are provided by different operators and those are not coordinated and the information about the services are scattered, the passengers will suffer. In order to incorporate the passenger perspective in the re-scheduling of railway traffic and associated public transport services, the passenger flow needs to be assessed and quantified. We therefore perform a survey of previous research studies that propose and apply computational re-scheduling support for railway traffic disturbance management with a passenger-oriented objective. The analysis shows that there are many different ways to represent and quantify the effects of delays on passengers, i.e.“passenger inconvenience”. In the majority of the studies, re-scheduling approaches rely on historic data on aggregated passenger flows, which are independent of how the public transport services are re-scheduled. Few studies incorporate a dynamic passenger flow model that reacts based on how the transport services are re-scheduled. None of the reviewed studies use real-time passenger flow data in the decision-making process. Good estimations of the passenger flows based on historic data are argued to be sufficient since access to large amounts of passenger flow data and accurate prediction models is available today.