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  • 1.
    Abghari, Shahrooz
    et al.
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Boeva, Veselka
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Lavesson, Niklas
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Grahn, Håkan
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Gustafsson, Jörgen
    Ericsson AB.
    Shaikh, Junaid
    Ericsson AB.
    Outlier Detection for Video Session Data Using Sequential Pattern Mining2018In: ACM SIGKDD Workshop On Outlier Detection De-constructed, 2018Conference paper (Refereed)
    Abstract [en]

    The growth of Internet video and over-the-top transmission techniqueshas enabled online video service providers to deliver highquality video content to viewers. To maintain and improve thequality of experience, video providers need to detect unexpectedissues that can highly affect the viewers’ experience. This requiresanalyzing massive amounts of video session data in order to findunexpected sequences of events. In this paper we combine sequentialpattern mining and clustering to discover such event sequences.The proposed approach applies sequential pattern mining to findfrequent patterns by considering contextual and collective outliers.In order to distinguish between the normal and abnormal behaviorof the system, we initially identify the most frequent patterns. Thena clustering algorithm is applied on the most frequent patterns.The generated clustering model together with Silhouette Index areused for further analysis of less frequent patterns and detectionof potential outliers. Our results show that the proposed approachcan detect outliers at the system level.

  • 2.
    Abghari, Shahrooz
    et al.
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Boeva, Veselka
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Lavesson, Niklas
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Grahn, Håkan
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Ickin, Selim
    Ericsson, SWE.
    Gustafsson, Jörgen
    Ericsson, SWE.
    A Minimum Spanning Tree Clustering Approach for Outlier Detection in Event Sequences2018In: The 17th IEEE International Conference on Machine Learning and Applications Special Session on Machine Learning Algorithms, Systems and Applications, IEEE, 2018Conference paper (Refereed)
    Abstract [en]

    Outlier detection has been studied in many domains. Outliers arise due to different reasons such as mechanical issues, fraudulent behavior, and human error. In this paper, we propose an unsupervised approach for outlier detection in a sequence dataset. The proposed approach combines sequential pattern mining, cluster analysis, and a minimum spanning tree algorithm in order to identify clusters of outliers. Initially, the sequential pattern mining is used to extract frequent sequential patterns. Next, the extracted patterns are clustered into groups of similar patterns. Finally, the minimum spanning tree algorithm is used to find groups of outliers. The proposed approach has been evaluated on two different real datasets, i.e., smart meter data and video session data. The obtained results have shown that our approach can be applied to narrow down the space of events to a set of potential outliers and facilitate domain experts in further analysis and identification of system level issues.

  • 3.
    Abghari, Shahrooz
    et al.
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    García Martín, Eva
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Johansson, Christian
    NODA Intelligent Systems AB, Sweden.
    Lavesson, Niklas
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Grahn, Håkan
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Trend analysis to automatically identify heat program changes2017In: Energy Procedia, Elsevier, 2017, p. 407-415Conference paper (Refereed)
    Abstract [en]

    The aim of this study is to improve the monitoring and controlling of heating systems located at customer buildings through the use of a decision support system. To achieve this, the proposed system applies a two-step classifier to detect manual changes of the temperature of the heating system. We apply data from the Swedish company NODA, active in energy optimization and services for energy efficiency, to train and test the suggested system. The decision support system is evaluated through an experiment and the results are validated by experts at NODA. The results show that the decision support system can detect changes within three days after their occurrence and only by considering daily average measurements.

  • 4.
    Adlemo, Anders
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Supply Chain and Operations Management.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Fuzzy logic based decision-support for reshoring decisions2018In: Proceedings of the 8th International Conference on Operations and Supply Chain Management, 2018Conference paper (Refereed)
  • 5.
    Adlemo, Anders
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University / School of Engineering.
    Tan, He
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Test case quality as perceived in Sweden2018In: Proceedings - International Conference on Software Engineering / [ed] Michael Unterkalmsteiner, ACM Digital Library, 2018, p. 9-12Conference paper (Refereed)
    Abstract [en]

    In order to reach an acceptable level of confidence in the quality of a software product, testing of the software is paramount. To obtain "good" quality software it is essential to rely on "good" test cases. To define the criteria for what make up for a "good" test case is not a trivial task. Over the past 15 years, a short list of publications have presented criteria for "good" test cases but without ranking them based on their importance. This paper presents a non-exhaustive and non-authoritative tentative list of 15 criteria and a ranking of their relative importance. A number of the criteria come from previous publications but also from discussions with our industrial partners. The ranking is based on results collected via a questionnaire that was sent out to a limited number of randomly chosen respondents in the Swedish software industry. This means that the results are more indicative than conclusive.

  • 6.
    Adlemo, Anders
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Supply Chain and Operations Management.
    Eriksson, David
    Jönköping University, School of Engineering, JTH, Supply Chain and Operations Management.
    Knowledge intensive decision support for reshoring decisions2018In: Proceedings of the 30th Annual NOFOMA Conference: Relevant Logistics and Supply Chain Management Research, Kolding, 2018Conference paper (Refereed)
  • 7.
    Adlemo, Anders
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Hilletofth, Per
    Jönköping University, School of Engineering, JTH, Supply Chain and Operations Management.
    Eriksson, David
    Jönköping University, School of Engineering, JTH, Supply Chain and Operations Management.
    Reshoring decision support in a Swedish context2018Conference paper (Refereed)
    Abstract [en]

    This paper presents a decision-support system for reshoring decision-making based on fuzzy logic. The construction and functionality of the decision-support system are described, and the functionality is evaluated in a high cost environment exemplified through a Swedish context. Ten different reshoring scenarios, provided by Swedish reshoring experts, are entered into the decision-support system and the decision recommendations provided by the system are presented. The confidence that can be put on the recommendations is demonstrated by comparing them with those of the reshoring experts. The positive results obtained indicate that fuzzy logic is both feasible and that the quality of the results are sufficiently good for reshoring decision-making.

  • 8.
    Ahlberg, Ernst
    et al.
    Predictive Compound ADME & Safety, Drug Safety & Metabolism, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Winiwarter, Susanne
    Predictive Compound ADME & Safety, Drug Safety & Metabolism, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Boström, Henrik
    Department of Computer and Systems Sciences, Stockholm University, Sweden.
    Linusson, Henrik
    Department of Information Technology, University of Borås, Sweden.
    Löfström, Tuve
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Department of Information Technology, University of Borås, Sweden.
    Norinder, Ulf
    Swetox, Karolinska Institutet, Unit of Toxicology Sciences, Sweden.
    Johansson, Ulf
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Department of Information Technology, University of Borås, Sweden.
    Engkvist, Ola
    External Sciences, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Hammar, Oscar
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Bendtsen, Claus
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Cambridge, UK.
    Carlsson, Lars
    Quantitative Biology, Discovery Sciences, AstraZeneca IMED Biotech Unit, Mölndal, Sweden.
    Using conformal prediction to prioritize compound synthesis in drug discovery2017In: Proceedings of Machine Learning Research: Volume 60: Conformal and Probabilistic Prediction and Applications, 13-16 June 2017, Stockholm, Sweden / [ed] Alex Gammerman, Vladimir Vovk, Zhiyuan Luo, and Harris Papadopoulos, Machine Learning Research , 2017, p. 174-184Conference paper (Refereed)
    Abstract [en]

    The choice of how much money and resources to spend to understand certain problems is of high interest in many areas. This work illustrates how computational models can be more tightly coupled with experiments to generate decision data at lower cost without reducing the quality of the decision. Several different strategies are explored to illustrate the trade off between lowering costs and quality in decisions.

    AUC is used as a performance metric and the number of objects that can be learnt from is constrained. Some of the strategies described reach AUC values over 0.9 and outperforms strategies that are more random. The strategies that use conformal predictor p-values show varying results, although some are top performing.

    The application studied is taken from the drug discovery process. In the early stages of this process compounds, that potentially could become marketed drugs, are being routinely tested in experimental assays to understand the distribution and interactions in humans.

  • 9.
    Ahmad, Hanna
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Asmelash, Simon
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Business Intelligence: Framtagning av kriterier innan val av BI-system för mindre företag2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose – The purpose of this thesis was to investigate which criteria that are vital before the choice of BI-system for small companies with 10-30 employees. Furthermore, to find an appropriate BI-tool that is applicable for small companies with 10-30 employees.

     

    Method – The authors have used semi-structured interviews and literature studies. The qualitative interviews have been conducted by interviewing BI-experts from five smaller companies. The literature review consisted of scientific articles, course literature, and relevant web-pages.

     

    Findings – The findings of this thesis are a production of criteria and a proposal on BI-tool, in the choice of BI-system for smaller companies with 10-30 employees.

     

    Implications – The produced findings of this thesis indicate that there are gaps in what are essential to think of, before a future investment of a BI-system that is suitable for smaller companies with 10-30 employees. Furthermore, there is limited research about which BI-tool that is appropriate for smaller companies with 10-30 employees. This thesis is directed towards smaller companies that are interested in acquiring a BI-system to their organization.

     

    Limitations – This thesis was limited by time constraints, that is why the authors remained their focus on companies with 10-30 employees.

     

    Keywords – Business Intelligence, decision-making, criteria, smaller companies, system.

  • 10.
    Albertsen, Thomas
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Seigerroth, Ulf
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Modelling Network-based Defence: Success and Failure of an Enterprise Modelling Endeavour2010In: The Practice of Enterprise Modeling: Third IFIP WG 8.1 Working Conference / [ed] Patrick Van Bommel, Stijn Hoppenbrouwers, Sietse Overbeek, Erik Proper, Joseph Barjis, Berlin: Springer , 2010, p. 121-129Conference paper (Refereed)
    Abstract [en]

    Research projects have an inherent risk of failure, and learning howto cope with the risk is an important task for everyone involved. In order to doso it is necessary to share the knowledge of the experiences done during andafter the project. This paper investigates a recently completed enterprisemodeling research project and contributes with lessons learned andrecommendations for future enterprise modeling projects.

  • 11.
    Albertsen, Thomas
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Seigerroth, Ulf
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    The Practice of Competence Modelling2010In: The Practice of Enterprise Modeling: Third IFIP WG 8.1 Working Conference / [ed] Patrick Van Bommel, Stijn Hoppenbrouwers, Sietse Overbeek, Erik Proper, Joseph Barjis, Berlin: Springer , 2010, p. 106-120Conference paper (Refereed)
    Abstract [en]

    A clear understanding of the organizational competences of anenterprise and the underlying individual competences and the competencedevelopment needs has become more and more important for many industrialareas as a foundation for competence supply processes and adjustment tochanging market conditions. Competence modelling, i.e. the use of enterprisemodelling techniques for capturing existing and describing desiredorganisational and individual competences in enterprises, offers importantcontributions to this. In the last years, the authors of the paper have performed anumber of competence modelling cases, which revealed different characteristicsand resulted in lessons learned. This paper presents an examination of differentcharacteristics of competence modelling cases, and recommendations andlessons learned from these cases for the practice of competence modelling.

  • 12.
    Albertsen, Thomas
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Towards Competence Modeling and Competence Matching for Network-based Defense2007In: Proc. The 3rd International Conference on Military Technology, MilTech3, June 2007, Stockholm, 2007Conference paper (Other academic)
  • 13.
    Albertsen, Thomas
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Towards Competence Modeling and Competence Matching for Network-Based Defense2008In: Stockholm contributions in Military-Technology 2007 / [ed] M. Norsell, Stockholm: Swedish National Defence College , 2008, p. 9-22Chapter in book (Other academic)
  • 14.
    Albertsen, Thomas
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Seigerroth, Ulf
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Competence demand modeling: case study2009Report (Other academic)
  • 15.
    Albertsen, Thomas
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Seigerroth, Ulf
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Competence modeling and matching: frame concept2009Report (Other academic)
  • 16.
    Albertsen, Thomas
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Seigerroth, Ulf
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Modellering av 312. luftburna kompaniet: KOMO - Projektrapport2009Report (Other academic)
  • 17.
    Al-Ghareeb, Meelad
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Vibration exposure model for human operators working with chainsaw equipment.2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 18.
    Al-Ghareeb, Meelad
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Antranik, Sevag
    Riktlinjer för grafiska användargränssnitt för lagersystem2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna rapport är att undersöka och sammanställa riktlinjer för att utveckla ett grafiskt användargränssnitt för ett lagersystem. För att uppnå syftet med rapporten litteraturstudier, intervjuer, observationer och en prototyputveckling utfördes. Utifrån litteraturstudier visade det sig att det inte fanns specifika designriktlinjer för utveckling av lagersystem fast det fanns allmänna riktlinjer som kan användas för design av olika system. Intervjuer med utvecklare och en utvecklingschef på företaget Qsys hjälpte till att hitta befintliga riktlinjer som företaget använder. Det visade sig att de använder allmänna riktlinjer som inte är specifika för lagersystem. För att hitta mer specifika riktlinjer observerade vi några lagerarbetare för att bättre förstå hur de integrerar med det befintliga systemet som de använder. Utifrån analysen av observationerna, upptäcktes det nya riktlinjer. Med hjälp av de allmänna riktlinjer som hittades i litteraturen och riktlinjer som upptäckes efter analysen av observationer, utvecklade vi en prototyp som sedan testades. Resultatet vi fick utifrån analysen av intervjuerna med lagerarbetarna efter prototyptestning, hjälpte med att hitta ytterligare specifika riktlinjer.För att utveckla ett användarvänligt lagersystem, behöver man ett användarvänligt gränssnitt. I denna rapport presenterar vi några riktlinjer som man kan använda sig av för att utveckla ett användarvänligt gränssnitt för lagersystem.

  • 19.
    Ali Fareedi, Abid
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Modelling of the Ward Round Process in a Healthcare Unit2011In: The Practice of Enterprise Modeling: 4th IFIP WG 8.1 Working Conference, PoEM 2011 Oslo, Norway, November 2-3, 2011 Proceedings / [ed] Paul Johannesson, John Krogstie and Andreas L. Opdahl, Springer Berlin/Heidelberg, 2011, Vol. 92, p. 223-237Conference paper (Refereed)
    Abstract [en]

    Information systems (IS) are nowadays extensively used to support all kinds of activities in healthcare organisations. Enterprise modelling can help to make the use of IS in healthcare more effective by providing process and domain models reflecting a particular healthcare unit. This paper proposes a model of the ward round process in a healthcare unit. The proposed model identifies the roles of medical professionals, tasks that can be performed according to the personnel’s competences, and activities that are carried out as part of the tasks to achieve goals of the ward round process. A formal approach has been used to implement the modelling results in the form of an ontology. Such formal ontologies can support improvement and development of IS in healthcare. We learned that modelling workshops are important for development of models that can be formalized in a machine-readable form.

  • 20.
    Alirezaie, Marjan
    et al.
    Örebro University.
    Hammar, Karl
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Blomqvist, Eva
    SICS - East Swedish ICT.
    SmartEnv as a Network of Ontology Patterns2018In: Semantic Web, ISSN 1570-0844, E-ISSN 2210-4968, Vol. 9, no 6, p. 903-918Article in journal (Refereed)
    Abstract [en]

    In this article we outline the details of an ontology, called SmartEnv, proposed as a representational model to assist the development process of smart (i.e., sensorized) environments. The SmartEnv ontology is described in terms of its modules representing different aspects including physical and conceptual aspects of a smart environment. We propose the use of the Ontology Design Pattern (ODP) paradigm in order to modularize our proposed solution, while at the same time avoiding strong dependencies between the modules in order to manage the representational complexity of the ontology. The ODP paradigm and related methodologies enable incremental construction of ontologies by first creating and then linking small modules. Most modules (patterns) of the SmartEnv ontology are inspired by, and aligned with, the Semantic Sensor Network (SSN) ontology, however with extra interlinks to provide further precision and cover more representational aspects. The result is a network of 8 ontology patterns together forming a generic representation for a smart environment. The patterns have been submitted to the ODP portal and are available on-line at stable URIs.

  • 21.
    Alirezaie, Marjan
    et al.
    Örebro Universitet.
    Hammar, Karl
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). RISE SICS East AB, Linköping, Sweden.
    Blomqvist, Eva
    Linköpings Universitet.
    Nyström, Mikael
    Linköpings Universitet.
    Ivanova, Valentina
    Linköpings Universitet.
    SmartEnv Ontology in E-care@home2018In: SSN 2018 - Semantic Sensor Networks Workshop: Proceedings of the 9th International Semantic Sensor Networks Workshopco-located with 17th International Semantic Web Conference (ISWC 2018) / [ed] Maxime Lefrançois, Raúl Garcia Castro, Amélie Gyrard, Kerry Taylor, CEUR-WS , 2018, Vol. 2213, p. 72-79Conference paper (Refereed)
    Abstract [en]

    In this position paper we briefly introduce SmartEnv ontology which relies on SEmantic Sensor Network (SSN) ontology and is used to represent different aspects of smart and sensorized environments. We will also talk about E-carehome project aiming at providing an IoT-based health-care system for elderly people at their homes. Furthermore, we refer to the role of SmartEnv in Ecarehome and how it needs to be further extended to achieve semantic interoperability as one of the challenges in development of autonomous health care systems at home.

  • 22.
    Amin, Skorupan
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Eyetracking som interaktions-hjälpmedel i fordon: Utveckling och utvärdering av ett ögonstyrt infotainmentsystem2018Independent thesis Basic level (degree of Bachelor), 12 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to develop and evaluate a new eye-controlled infotainmentsystem that worked differently compared to similar systems. What differs this new system is that personal calibration is not necessary to be performed before each time the system is to be used.

    The method Design Science Research (DSR) has been used where an artifact has been developed and then investigated. Experiments have been conducted to find out how well the infotainment system works when it uses a relative gaze towards an absolute, but also to find out how users should confirm their gaze in the best way. For confirmation of gaze, three different methods have been used; button press, blink, and gazing. The collected data from the experiments have been matched to evaluate how well they stand against each other.

    The result of the study shows that when the infotainment system used relative gaze, it worked in as many attempts as it did using absolute. The result times were very similar to each other which shows that the both methods works well even when face calibration is not used, but the collected data was uneven which made it difficult to draw conclusions about which one was faster. The study also shows that keystroke was the best-suited method to use to confirm gaze.This method was much faster than other methods.

    A limitation of the study has been that data collection was only done on two occasions. On more occasions more data could have been generated, which would have made it easier to draw more conclusions about the response times.

  • 23.
    Andersson, Adam
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Utveckling av testverktyg för mjukvara med fysiska komponenter2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A lot of time is spent on manual software testing. When software can interact with exponentially more and more components the number of tests required will increase at the same rate. Automation of these manual tests has been previously shown that a time-saving can occur with test automation. When tests need to be done on software that interacts with physical components the results of testing automation are harder to predict. This thesis aims to explain the impact of physical components on the development and the result of test tools developed for use on automated tests on objects with physical components. In this work, a test tool for automatic regression testing for height adjustable table legs were developed. The method used to design the tool was Design Science Research where, for example, TESLA was adapted for use in automated tests with physical components. TESLA is a language for specifying test cases and allowing test automation with embedded systems that was implemented in the test tool's design which could be used to automatically generate scripts and automatically executes test cases. With the development and design of the testing tool, the thesis attempted to answer how a test tool should be designed when physical components are included in the test object and how the measurement accuracy of the tool may affect the test result. Experiments have been carried out during the development process where regression tests have been performed according to a test protocol. During these experiments a test protocol is executed. One manually by hand and one is done automatically with the testing tool. The results of the experiments show that the execution of the test protocol execution with the test tool gave a time saving of 35% compared to the manual tests. The physical components of the test object were shown to affect the automatic execution time negative and further analysis of previous research has shown that this result is insufficient to justify the large initial time that is required to automate tests.

  • 24.
    Andersson, Andreas
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Ottehall, Henrik
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Rekommendationssystem för riktad annonsering: En studie av innehållsbaserad rekommendation i system med användare, element och annonser kopplade till en gemensam uppsättning diskreta metadata2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Advertising in mobile apps are increasing and so is the need to show the right ad to the right user. This study was conducted in cooperation with Seekly AB, a company whose app displays a feed with upcoming events in a users immediate area. In this app, every event is associated with an interest and users can choose interests to follow in a list. Seekly wanted to use so called behavioral targeting to show ads in their feed. The solution that was developed is useful for all Seekly-like systems and consists of a content based recommender system that chooses ads based on the interests a user has selected and events and ads that the user has shown an interest in. Apps that in some way or another resembles the Seekly app are not uncommon and recommender systems for behavioral targeting suited for this kind of system are to the best of our knowledge not described in the literature. The resulting recommender system has been implemented and shown to be able to recommend ads that has been associated with interests that match the interests selected by the user and/or amplified by his or her behavior. There are also indications that the system would be able to increase the number of ad clicks compared to randomly selected ads, but no statistically significant proof was found.

  • 25.
    Andersson, Julius
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Hultin Karlsson, Annika
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Förhållandet mellan feedback och pålitlighet i en mobilapplikation: En kvalitativ studie om visuell feedback, tonalitet och pålitlighet2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The following thesis is written by students at the School of Engineering at Jönköping University, informatics, New Media Design. The background of this report is based on a project collaboration with Toxic Interactive solutions AB, who wanted help with creating an application for registering sick leave from work. Since these registrations for sick leave affects the income and work relations, the aspect trust within an application was chosen as a subject for the report. Furthermore we connected this to the feedback element to see how trust was affected by this factor. Also the design and tonality of the feedback was chosen as a subject for the study. Visual feedback connects to the user with information about their actions and a confirmation.

    Based on this, two questions were formed:

    [1] How does visual feedback affect trust in a mobile application? [2] Does the the tonality in the feedback affect trust for a mobile application?

    To answer these questions, user tests and interviews was performed with the users. Three prototypes were created with different levels of feedback: no feedback, feedback with formal tonality and feedback with informal tonality. These were tested on nine users for each prototype (27 users in total). Parallelly two interviews with experts of the area were performed for a deeper knowledge and comparability. Other than this relevant studies and theories have been studied.

    The results of this study show that feedback contributes to increased trustworthiness amongst users. Although there are many other reasons that will have an affect. A formal tonality in the feedback is perceived as slightly more trustworthy according to the user tests and user interviews conducted. An insight about the connection between the tonality and target groups and subjective preferences was revealed from the expert interviews. Also, theories studied about the formality of the language mentions that it should be adapted to the specific target group.

    The conclusions that can be made from the study shows that trust, feedback and tonality are all connected. all the results show that feedback in a system has a positive effect on the user experience. Feedback also means more trust from a user than when its absent.

  • 26.
    Angelova, Milena
    et al.
    Technical University of sofia, BUL.
    Vishnu Manasa, Devagiri
    Blekinge Tekniska Högskola, Institutionen för datavetenskap.
    Boeva, Veselka
    Blekinge Tekniska Högskola, Institutionen för datavetenskap.
    Linde, Peter
    Blekinge Tekniska Högskola, Biblioteket.
    Lavesson, Niklas
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Blekinge Tekniska Högskola, Institutionen för datavetenskap.
    An Expertise Recommender System based on Data from an Institutional Repository (DiVA)2019In: Connecting the Knowledge Common from Projects to sustainable Infrastructure: The 22nd International conference on Electronic Publishing - Revised Selected Papers / [ed] Leslie Chan & Pierre Mounier, OpenEdition Press , 2019, p. 135-149Chapter in book (Refereed)
    Abstract [en]

    Finding experts in academics is an important practical problem, e.g. recruiting reviewersfor reviewing conference, journal or project submissions, partner matching for researchproposals, finding relevant M. Sc. or Ph. D. supervisors etc. In this work, we discuss anexpertise recommender system that is built on data extracted from the Blekinge Instituteof Technology (BTH) instance of the institutional repository system DiVA (DigitalScientific Archive). DiVA is a publication and archiving platform for research publicationsand student essays used by 46 publicly funded universities and authorities in Sweden andthe rest of the Nordic countries (www.diva-portal.org). The DiVA classification system isbased on the Swedish Higher Education Authority (UKÄ) and the Statistic Sweden's (SCB)three levels classification system. Using the classification terms associated with studentM. Sc. and B. Sc. theses published in the DiVA platform, we have developed a prototypesystem which can be used to identify and recommend subject thesis supervisors in academy.

  • 27.
    Angelova, Milena
    et al.
    Technical University of Sofia-branch Plovdiv, BUL.
    Vishnu Manasa, Devagiri
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Boeva, Veselka
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Linde, Peter
    Blekinge Tekniska Högskola, Biblioteket.
    Lavesson, Niklas
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    An Expertise Recommender SystemBased on Data from an Institutional Repository (DiVA)2018In: Proceedings of the 22nd edition of the International Conference on ELectronic PUBlishing, 2018Conference paper (Refereed)
    Abstract [en]

    Finding experts in academics is an important practical problem, e.g. recruiting reviewersfor reviewing conference, journal or project submissions, partner matching for researchproposals, finding relevant M. Sc. or Ph. D. supervisors etc. In this work, we discuss anexpertise recommender system that is built on data extracted from the Blekinge Instituteof Technology (BTH) instance of the institutional repository system DiVA (DigitalScientific Archive). DiVA is a publication and archiving platform for research publicationsand student essays used by 46 publicly funded universities and authorities in Sweden andthe rest of the Nordic countries (www.diva-portal.org). The DiVA classification system isbased on the Swedish Higher Education Authority (UKÄ) and the Statistic Sweden's (SCB)three levels classification system. Using the classification terms associated with studentM. Sc. and B. Sc. theses published in the DiVA platform, we have developed a prototypesystem which can be used to identify and recommend subject thesis supervisors inacademy.

  • 28.
    Anton, Holmberg
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Designprinciper vid utveckling av mobila applikationer2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the essay is to investigate which aspects are important to consider

    when an interface is developed for a mobile application. It will be investigated how

    the information should be structured to be as easy to understand as possible, when

    and why some color should be used and what types of fonts to be used and the ones

    that should be avoided.

    By examining these aspects, scientific guidelines will be developed which can then be

    applied when a mobile application is to be developed.

    Initially, a comprehensive literature study will be conducted in the areas of web

    design, graphic design, interface design and information architecture. This is done to

    gain a strong scientific foundation that can reinforce the statements and theories that

    will be put forward in the paper. In addition, interviews will be held with an intended

    audience for applications. The informants is represented by men and women from

    different countries in Europe, different ages and they will use different mobile

    platforms.

    The results obtained from the study provide a scientific basis for developing a mobile

    application. It gives an explanation of what should be taken into consideration for

    current user friendliness and rules when designing an interface and also what is

    important during the design process. Furthermore, the result gives an insight into

    the fonts to be used and when and where a certain color selection should be made.

    During the course of the report, implications have arisen which led to the selection of

    certain choices and the purpose and issues.

    Keyword:

    Application Design, Interface Design, Web Design.

  • 29.
    Antropov, Eliise
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Czapinska, Magdalena
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    The effect of information structure consistency on usability on cross-platform services2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 30.
    Aronsson, Linda
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Vad som engagerar användare på Facebook: Vad gillar du och varför? En undersökning om användarnas krav på innehåll samt vad företag kan förvänta sig av sin marknadsföring i sociala medier.2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose – The purpose of this study is to give companies and organization's knowledge on how to create relevant content that interests their customers and how they can work with their marketing on Facebook. 

    Method – Methods used in this study are a qualitative study including interviews with experts in the field of marketing in social media. Furthermore, a quantitative study was made through measuring the interaction on three business sites on Facebook.

    Findings – Findings show that it is important to focus on the purpose and goal for the marketing, and what it will result in. Furthermore, it is not a goal itself to have high engagement. Today, the Facebook users are more anonymous online than earlier, and it has become unusual for them to follow a business site. Creating content that invites the users to co-create and to meet outside social media results in high interaction among the followers in the quantitative study. Lastly, continuous presence is required along with a genuine interest towards the costumers, and that the company gives their customer's attention.

    Implications – The implication is therefore that users have become more used to that content is directed directly towards them with a high quality and relevance. The content is designed for a specific target group that reaches them at the right time to give them as relevant content as possible.

    Limitations – The study is limited to the social media Facebook and its users. Furthermore, the study is focused towards marketing on Facebook for business sites.

  • 31.
    Arvidsson, Simon
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Gullstrand, Marcus
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Classifying natural forests using LiDAR data2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In forestry, natural forests are forest areas with high biodiversity, in need of preservation. The current mapping of natural forests is a tedious task that requires manual labor that could possibly be automated.

    In this paper we explore the main features used by a random forest algorithm to classify natural forest and managed forest in northern Sweden. The goal was to create a model with a substantial strength of agreement, meaning a Kappa value of 0.61 or higher, placing the model in the same range as models produced in previous research.

    We used raster data gathered from airborne LiDAR, combined with labeled sample areas, both supplied by the Swedish Forest Agency. Two experiments were performed with different features. Experiment 1 used features extracted using methods inspired from previous research while Experiment 2 further added upon those features. From the total number of used sample areas (n=2882), 70% was used to train the models and 30% was used for evaluation.

    The result was a Kappa value of 0.26 for Experiment 1 and 0.32 for Experiment 2. Features shown to be prominent are features derived from canopy height, where the supplied data also had the highest resolution. Percentiles, kurtosis and canopy crown areas derived from the canopy height were shown to be the most important for classification. The results fell short of our goal, possibly indicating a range of flaws in the data used. The size of the sample areas and resolution of raster data are likely important factors when extracting features, playing a large role in the produced model’s performance.

  • 32.
    Asp, Jin
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Bergdahl, Saga
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Categorizing conference room climate using K-means2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Smart environments are increasingly common. By utilizing sensor data from the indoor environment and applying methods like machine learning, they can autonomously control and increase productivity, comfort, and well-being of occupants.

    The aim of this thesis was to model indoor climate in conference rooms and use K-means clustering to determine quality levels. Together, they enable categorization of conference room quality level during meetings. Theoretically, by alerts to the user, this may enhance occupant productivity, comfort, and well-being. Moreover, the objective was to determine which features and which k would produce the highest quality clusters given chosen evaluation measures.

    To do this, a quasi-experiment was used. CO2, temperature, and humidity sensors were placed in four conference rooms and were sampled continuously. K-means clustering was then used to generate clusters with 10 days of sensor data. To evaluate which feature combination and which k created optimal clusters, we used Silhouette, Davis Bouldin, and the Elbow method.

    The resulting model, using three clusters to represent quality levels, enabled categorization of the quality of specific meetings. Additionally, all three methods indicated that a feature combination of CO2 and humidity, with k = 2 or k = 3, was suitable.

  • 33.
    Assgård, Christoffer
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Effektivisering av informationsflödet inom en offentlig organisation2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose – The purpose of this study is to investigate what kind of problems a public organization has with their information flow and suggest a solution to the identified problems.To achieve the purpose, will the report answer the following questions:

    1. What problems do a public organization have with the information flow?
    2. How can a specification contribute to efficiency the flow of information within a public organization?

    Method – In order to achieve the objectives of the study and answer the research questions, a qualitative study is conducted in a public organization. First, semi-structured interviews have been conducted, and then a literature search is performed to provide a knowledge base in this field. From this emerges a specification that forms the basis for a more efficient flow of information within a public organization. The empirical data, which is collected in the manner described, is then analysed and compared with the collected theory. This is to compare the real working life with the theory. Even literature studies have been carried out because it is important to have a stable background current methods, theories and tools. With its basis in the specification, the proposed solutions was developed after an election has made the kind of solution that is fit for purpose. This was done in consultation with the organization concerned. The requirement specification has been analysed by the empirical data and theories, and occurred in consulting with the organization concerned. A demonstration of the final solution and follow-up interviews were also conducted, to get feedback about the solution improvement of the information flow within the public organization.

    Findings – The study results are based on the collected empirical data and the conducted literature review. The result shows that development of an artefact in the form of guidelines for a set of requirements that form the basis, for further development solution improvement of the information flow has resulted in an improvement of the information flow within a public organization. The requirements that have been identified; with semi-structured interview have been used to create the specification demands. This is done to get a good result that solves the organizations requirements and needs, in terms of information flow in a public organization.

    Implications – Blomkvist and Hallin (2015) argues that some thesis provides a methodological contribution to research this, a new way to solve an organization's practical problems. This is this study knowledge contribution. Knowledge contribution in terms of research in informatics, it contributes to an improvement in the distribution of information. This is through the development and use guidelines for a set of requirements that underpin it. The study provides support by producing a guidance on a specification in the form of an artefact that is the basis for development. Further studies may be seen as desirable as this study has only focused on the organization and for research to be optimal and needs further studies in the field carried out.

    Limitations – The study was conducted in a public organization and therefore the results of the study are specifically relevant for this kind of organizations.

  • 34.
    Axelsson, Emil
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Hansson, Hanna
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Internet of Things: Kommunikationsstandarder för smarta hem, i teorioch praktik2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 35.
    Ay, Konstantin
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    George, Joshua
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Decentraliserad datalagring baserad på blockkedjan: En studie som jämför Storj.io och Microsoft Azure Blob Storage2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The majority of cloud storage platforms rely on a centralized structure, with the most popular being Microsoft Azure. Centralization causes consumers to rely on the provider to maintain accessibility and security of data. However, platforms such as Storj.io are based on a decentralized structure. To become decentralized, Storj.io uses blockchain technology in a means to create an automated consensus mechanism between the entities storing the data. There is however little research regarding performance and security issues on a decentralized platform based on blockchain technology.

    The purpose of this study is to identify the beneficial and non-beneficial aspects of using blockchain-based decentralized cloud storage as a substitute for centralized ones. The study focuses on performance and security.

    A comparative case study has been executed, consisting of an experiment and literature study. Quantitative data from an experiment was used in a hypothesis test to determine whether there were any performance differences between Microsoft Azure Blob Storage and Storj.io. A literature study generating qualitative data was then made to identify differences in security measures and from that also discuss potential security risks on a service like Storj.io.

    This study found that the performance of Storj.io was lower than Microsoft Azure’s Blob Storage. Causes of these results were identified to be due to the many more steps during resource allocation in Storj.io, compared to Blob Storage. Security risks identified in Storj.io through the literature study were generally connected to the consensus mechanism. However, research shows that it is very unlikely for the consensus mechanism to be compromised. Because Microsoft Azure’s service does not use a blockchain, these risks do not exist. For secure data transfer to Azure’s service, consumers have to implement encryption manually client-side. Therefore, this study could not conclude whether Storj.io is a safe alternative because a consumer using the Microsoft Azure service is responsible for implementing security measures.

    Conclusions drawn from this study are intended to act as new knowledge in the field of blockchain-based decentralized cloud storage. It is an outset to decide whether to use centralized cloud storage or blockchain-based decentralized cloud storage from a performance and security perspective.

  • 36.
    Benkenstein, Martin
    et al.
    Institute for Business Administration, University of Rostock, Rostock, Germany.
    Fellmann, Michael
    Institute of Computer Science, University of Rostock, Rostock, Germany.
    Leyer, Michael
    Institute for Business Administration, University of Rostock, Rostock, Germany.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University, School of Engineering, JTH. Research area Computer Science and Informatics.
    The value of enterprise modelling: Towards a service-centric perspective2016In: The practice of enterprise modeling: 9th IFIP WG 8.1. Working Conference, PoEM 2016, Skövde, Sweden, November 8-10, 2016, Proceedings / [ed] Jennifer Horkoff, Manfred A. Jeusfeld & Anne Persson, Springer, 2016, p. 299-306Conference paper (Refereed)
    Abstract [en]

    Enterprise modeling is an important and widespread activity in managing enterprises. A well-founded conceptualization of its value is however missing so far which can be traced back to different understandings of constituents of enterprise modelling. Addressing these different understandings, we propose to take a service-centric perspective to determine the value of enterprise modelling. We describe the benefits of this perspective and justify our positioning regarding a service-centric perspective.

  • 37.
    Berg, Samuel
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    User Interfaces and Immersion: The Effect Diegetic User Interfaces Have on Immersion in Third-Person Games2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to discover how the use of diegetic user interfaces (compared to non-diegetic user interfaces) affect immersion experienced in third-person video games. The main research question to be answered is: How does the use of diegetic user interfaces in third-person games affect the immersion experienced by players? To answer the main research question, the question was broken down into five different questions and online experiments were conducted. The experiments included six participants in which all of them played two different versions of the same computer game (one non-diegetic version and one diegetic version) as well as a survey (questionnaire) for each of the games including questions about the participants and numerical rating scales (on scales from 1 to 5) about their experiences with the game versions. In general, there did not seem to be a significant between the two versions of the game in terms of immersion. While the results suggest that the non-diegetic versions of the game causes players to become more frustrated, this could possibly just have been a coincidence due to the small sample size, and the difference was not “extreme” either (2.5 compared to about 1.833). Since the p-value generated was 0.32291 regarding frustration, which is several times more than 0.05, it suggests the statistical significance of the result is low. Enjoyability seemed to be about the same for the two versions of the game as well, and the variance was quite small compared to some other results (about 0.556). The variance regarding the visuals seems relatively small as well (0.25 to about 0.472) which tends to suggest that it might be unlikely that the non-diegetic user interface is heavily disliked. It might even be preferred. Either way, the results do not seem to be statistically significant.

  • 38.
    Berggren, Emil
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering.
    Gustafson, Tobias
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Jämförelse av GPGPU-ramverk och AES-metoder: Jämförelse av GPGPU-ramverk och AES-metoder för att besvara vilka GPGPU-ramverk och vilken AES-metod som bör rekommenderas för AES-kryptering med GPGPU2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract Background - Processors today are approaching the limit for how high clockfrequences they can run. This has led to that instead of trying to make them run faster they are instead made with multiple cores so they can utilize parallelization by running several threads in parallel. However aside from the CPU there is still the graphics card which has a large amount of unused computing power for long durations of time while the computer is active. While a GPU might not have as quick processors it instead has several thousands of them at the same time than a CPU which have led to the development of GPGPU-frameworks to use that potential parallelization. The profit in this lies in using algorithms and code functions that got high potential parallelization, one of which is the AES encryption algorithm. AES is one of the most widely used encryption algorithms today and also considered to be one of the most secure.

    Purpose – By using GPGPU-acceleration the encryption speed of AES is higher than by using a traditional CPU approach. To make the GPU-acceleration as effective as possible this study looks into which AES-method and which GPGPU-framework that should be chosen during development.

    Method – This study makes two literature studies to determine which AES-methods and which GPGPU-frameworks that are viable for GPU-acceleration of AES. Afterwards this study conducts experiments to determine which of these GPGPU-frameworks are the most effective.

    Findings – The conclusion drawn from the literature study is that the CTR-method among the AES-methods is preferable due to its parallelization potential and high security measures. Among the current GPGPU-frameworks only two frameworks satisfies the criteria determined from the literature study and those are CUDA and OpenCL. From the experiment the conclusion is thereafter drawn that of the two GPGPU-frameworks CUDA is more effective due to the bandwidth limits that OpenCL have compared to CUDA. This conclusion is valid on at least the tested graphics card, GTX 560.

    Implications – CUDA is faster at larger file sizes than OpenCL due to limited data transfer speed in OpenCL on a GTX 560.

    Limitations – The experiments were only conducted on one graphics card from Nvidia due to hardware constraints in that CUDA can only be run on Nvidia hardware. Due to this hardware constraint and Nvidia’s lack of support in their tools for debugging and profiling of OpenCL the results from the testing of OpenCL couldn’t be verified using external tools.

    Keywords – Processor, GPGPU, AES, CTR, OpenCL, CUDA, GPGPU-framework

  • 39.
    Bergman, Mikael
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Hertzberg, Tim
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    User Experience för mobila applikationer på iPhones med stora skärmar2016Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Purpose

    Smartphone screens have in recent years increased greatly in size. This has created problems for the user experience. Thus, the purpose of the study is:

    How mobile applications for smartphones with larger screens should be developed in the future to provide as good UX as possible.

    In order to answer the purpose it has been broken down into three research questions:

    Which parameters (type of objects) are most affected by different screen sizes?

    Depending on the screen size, are different layouts preferred?

    How much of the screen can be reached by one handed use?

    Method

    A study of literature is made to answer the first research question. It became the basis of a questionnaire in the form of an application, which answered the study's second and third research questions. The test subjects ranked different layouts depending on their perceived user experience. The tests were conducted on an iPhone 4S and an iPhone 6S Plus to evaluate the differences between different screen sizes.

    Findings

    The study concluded that it is important to place essential items within the user’s reach when one hand is used. Items placed at the edges or corners of the screen are often difficult to reach on a larger screen, which means that avoiding such placement is preferred.

    Implications

    The study can both be of service in future research on user experience and reach, but also give recommendations on what is important to take into consideration when developing mobile applications for smartphones with larger screens.

    Limitations

    Since the study was conducted over a limited period of time there was no opportunity for more tests.

  • 40.
    Bernhard, J.
    et al.
    ITN, Campus Norrköping, Linköping University, Norrköping, Sweden.
    Carstensen, Anna-Karin
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    "Real" experiments or computers in labs - Opposites or synergies?: Experiences from a course in electric circuit theory2017In: Proceedings of the 45th SEFI Annual Conference 2017 - Education Excellence for Sustainability, SEFI 2017 / [ed] J. Bernardino, J. Rocha,J. C. Quadrado, European Society for Engineering Education (SEFI) , 2017, p. 1300-1307Conference paper (Refereed)
    Abstract [en]

    In this study we report from our experiences designing and re-designing a lab where engineering students studied transient response in electric circuits. In the first version of the lab students had difficulties doing the mathematical modeling of the experimentally measured graphs as it required students' to link the time- and frequency domains as well as the object/event and theory/model worlds simultaneously. In the re-designed lab some computer simulations were included together with the original experiments on real circuits. The simulations opened up for learning and enabled students to establish links that are hard access directly with real experiments. Still doing real experiments is important to secure students ability to make links between models and theories and the physical reality. This study demonstrates that synergetic learning effects can be achieved by a careful design using an insightful combination of real experiments and computer simulations. Hence, we propose that the question of "real" experiments or "virtual" labs using computer simulations are best for students' learning is not an either or question. Rather, it is a question of finding the right blend to achieve synergetic effects.

  • 41.
    Bernhard, Jonte
    et al.
    Department of Science and Technology, Linköping University, Norrköping, Sweden.
    Carstensen, Anna-Karin
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Davidsen, Jacob
    Department of Communication and Psychology, Aalborg University, Aalborg, Denmark.
    Ryberg, Thomas
    Department of Communication and Psychology, Aalborg University, Aalborg, Denmark.
    Practical Epistemic Cognition in a Design Project--Engineering Students Developing Epistemic Fluency2019In: IEEE Transactions on Education, ISSN 0018-9359, E-ISSN 1557-9638Article in journal (Refereed)
    Abstract [en]

    Contribution: This paper reports engineering students' practical epistemic cognition by studying their interactional work in situ. Studying "epistemologies in action'' the study breaks away from mainstream approaches that describe this in terms of beliefs or of stage theories.

    Background: In epistemology, knowledge is traditionally seen as "justified true belief'', neglecting knowledge related to action. Interest has increased in studying the epistemologies people use in situated action, and their development of epistemic fluency. How appropriate such approaches are in engineering and design education need further investigation.

    Research Questions: 1) How do students in the context of a design project use epistemic tools in their interactional work? and 2) What are the implications of the findings in terms of how students' cognitive and epistemological development could be conceptualized?

    Methodology: A collaborative group of six students were video recorded on the 14th day of a fifth-semester design project, as they were preparing for a formal critique session. The entire, almost 6 h, session was recorded by four video cameras mounted in the design studio, with an additional fifth body-mounted camera. The video data collected was analyzed using video ethnographic, conversation analysis, and embodied interaction analysis methods.

    Findings: The results show that the students use a wealth of bodily material resources as an integral and seamless part of their interactions as epistemic tools, in their joint production of understanding and imagining. The analysis also suggests that students' epistemological and cognitive development, individually and as a group, should be understood in terms of developing "epistemic fluency.'' 

  • 42.
    Bernhard, Jonte
    et al.
    ITN, Campus Norrköping, Linköping University, Norrköping, Sweden.
    Carstensen, Anna-Karin
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University, School of Engineering, JTH. Research area Computer Science and Informatics.
    Karlsson, Kjell
    ITN, Campus Norrköping, Linköping University, Norrköping, Sweden .
    Alternating currents first: Experiences from designing a novel approach to teaching electric circuit theory2016In: 44th Annual Conference of the European Society for Engineering Education - Engineering Education on Top of the World: Industry-University Cooperation, SEFI 2016, European Society for Engineering Education (SEFI) , 2016Conference paper (Refereed)
    Abstract [en]

    BACKGROUND: Commonly in electric circuit theory courses, circuit laws are first introduced in the context of direct current (DC) electricity and first thereafter are alternating currents (AC) introduced. The extension of DC-theory to AC is quite easily done mathematically but is conceptually difficult for students. Engineering students have difficulties in understanding phase relationships and phasor representations in AC-electricity. Indeed, it has been suggested that phase should be seen as a threshold concept.

    PURPOSE: The purpose of this study was to investigate if a re-designed introductory electric circuit course could improve students’ understanding of important concepts in AC-electricity.

    METHOD and COURSE DESIGN: The course was re-designed introducing AC and DC electricity simultaneously. DC was introduced as a special case of AC with requency equals zero. The re-designed course was taught for the first time during the spring semester 2014 and a new textbook was written. A conceptual test was developed and first administered in 2013 to serve as a baseline and in subsequent years to evaluate the revised course. In 2014 the students’ courses of action in selected lab-groups were video-recorded.

    RESULTS: In the first revision cycle many students had difficulties to complete the labs in time. Students revealed a mixed response towards the revised course and the results on the conceptual test showed neglible improvement. In the second cycle revisions the number tasks were reduced and focus was laid on tasks that were identified as most important for contributing to the development of student understanding. As a result the learning gain improved with an effect size (Cohen’s delta) of 0.56. Also the course and the textbook were very well appreciated. In the third cycle only small revisions are made.

    CONCLUSION: The results show that that AC-electricity can be taught concurrently with DC. However, two revisions cycles was needed which demonstrates that curriculum development needs a sustained effort over a considerable period of time with continuous revisions in light of gained experiences. In further revision we will continue to refine the labs and to develop appropriate interactive lecture demonstrations for the lectures and to develop the problems.

  • 43.
    Bertilsson, Tobias
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Johansson, Romario
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Undersökning om hjulmotorströmmar kan användas som alternativ metod för kollisiondetektering i autonoma gräsklippare.: Klassificering av hjulmotorströmmar med KNN och MLP.2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose – The purpose of the study is to expand the knowledge of how wheel motor currents can be combined with machine learning to be used in a collision detection system for autonomous robots, in order to decrease the number of external sensors and open new design opportunities and lowering production costs.

    Method – The study is conducted with design science research where two artefacts are developed in a cooperation with Globe Tools Group. The artefacts are evaluated in how they categorize data given by an autonomous robot in the two categories collision and non-collision. The artefacts are then tested by generated data to analyse their ability to categorize.

    Findings – Both artefacts showed a 100 % accuracy in detecting the collisions in the given data by the autonomous robot. In the second part of the experiment the artefacts show that they have different decision boundaries in how they categorize the data, which will make them useful in different applications.

    Implications – The study contributes to an expanding knowledge in how machine learning and wheel motor currents can be used in a collision detection system. The results can lead to lowering production costs and opening new design opportunities.

    Limitations – The data used in the study is gathered by an autonomous robot which only did frontal collisions on an artificial lawn.

    Keywords – Machine learning, K-Nearest Neighbour, Multilayer Perceptron, collision detection, autonomous robots, Collison detection based on current.

  • 44.
    Bijedic, Jasmina
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Forsberg, Angelica
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Push the button: En studie om färgens påverkan på CTA-knappar2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 45.
    Björnberg, Stina
    et al.
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Johansson, Albin
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics.
    Web agencies adaption of accessible web directives2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Digital divisions are getting smaller in Sweden which makes the range of users wider than ever before. This results in higher expectations and requirements on web in order to be sufficient for everyone. This study investigates how web agencies work with web accessibility, why some do not work with it and solutions making daily operations more efficient. This is a qualitative study with an inductive approach, where semi-structured interviews were used to gather empirical data. Six web agencies in Jönköping took part of the study through interviews. In order to analyse the empirical data we used thematic analysis. No unknown methods or techniques were discovered along the study. There were surprisingly few agencies that worked with accessibility at all of those who took part in the study. Some of them more than others, but overall it was low prioritized. Lack of knowledge within the subject became the main reason for not develop for accessibility. An immature and non-standardized industry might be the explanation behind that. Not surprisingly, resources in form of economy is also a reason. It turns out to be hard for agencies to motivate customers to pay for accessibility. However, the motivation process with customers is rarely supported by enough knowledge and leads therefore to insufficient arguments, which does not motivate customers enough to pay for it. Further on, include web accessibility as a given part of CSR plans on both agencies side, but also motivating it for customers. The importance of a mature dialog about it is crucial for survival of accessibility. All parties of a development process should take their responsibility. Everyone can and should participate in the journey towards a more equal society.

  • 46.
    Blomqvist, Eva
    et al.
    Linköping University, Department of Computer and Information Science; STLab, ISTC-CNR.
    Gangemi, AldoSTLab, ISTC-CNR.Hammar, KarlJönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).Suárez-Figueroa, Mari CarmenOntology Engineering Group, Universidad Politécnica de Madrid.
    WOP 2012: Proceedings of the 3rd Workshop on Ontology Patterns2012Conference proceedings (editor) (Refereed)
  • 47.
    Blomqvist, Eva
    et al.
    Linköping University, Linköping, Sweden.
    Hammar, Karl
    Jönköping University, School of Engineering, JTH. Research area Computer Science and Informatics. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Presutti, Valentina
    ISTC-CNR, Rome, Italy.
    Engineering Ontologies with Patterns - The eXtreme Design Methodology2016In: Ontology Engineering with Ontology Design Patterns / [ed] Pascal Hitzler, Aldo Gangemi, Krzysztof Janowicz, Adila Krisnadhi, Valentina Presutti, IOS Press, 2016, p. 23-50Chapter in book (Refereed)
    Abstract [en]

    When using Ontology Design Patterns (ODPs) for modelling new parts of an ontology, i.e., new ontology modules, or even an entire ontology from scratch, ODPs can be used both as inspiration for different modelling solutions, as well as concrete templates or even “building blocks” reused directly in the new solution. This chapter discusses how ODPs, and in particular Content ODPs, can be used in ontology engineering. In particular, a specific ontology engineering methodology is presented, which was originally developed for supporting ODP use. However, this methodology, the eXtreme Design (XD), also has some characteristics that set it apart from most other ontology engineering methodologies, and which may be interesting to consider regardless of how much emphasis is put on the ODP usage. Towards the end of the chapter some XD use cases are also reported and discussed, as well as lessons learned from applying XD. The chapter is concluded through a summary and discussion about future work.

  • 48.
    Blomqvist, Eva
    et al.
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Levashova, Tatiana
    Öhgren, Annika
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Sandkuhl, Kurt
    Jönköping University, School of Engineering, JTH. Research area Information Engineering.
    Smirnov, Alexander
    Tarasov, Vladimir
    Jönköping University, School of Engineering, JTH. Research area Information Engineering. Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL).
    Configuration of Dynamic SME Supply Chains Based on Ontologies2005In: Holonic and Multi-Agent Systems for Manufacturing: Second International Conference on Industrial Applications of Holonic and Multi-Agent Systems, HoloMAS 2005, Copenhagen, Denmark, August 22-24, 2005. Proceedings / [ed] V. Marik, R. W. Brennan & M. Pechoucek, Springer Berlin/Heidelberg, 2005, p. 246-256Conference paper (Refereed)
    Abstract [en]

    Due to the increasing implementation of agile and networked manufacturing, supply chain has entered a new phase, virtual supply chain. The phase is characterized by the integration of activities, operations, and functions carried out at different and geographically distributed supply chain stages. The paper proposes an approach to the configuration of a network of small and medium-sized enterprises (SMEs) being integrated into a supply chain. The SME supply chain configuration is based on a shared domain ontology for supply chain management, offering the configuration task as a function of supply chain management. Principles of the development of the shared ontology and possible ways of matching between enterprise and domain ontologies are considered.

  • 49.
    Boeva, Veselka
    et al.
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Angelova, Milena
    Technical University Sofia, BUL.
    Lavesson, Niklas
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics, JTH, Jönköping AI Lab (JAIL). Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Rosander, Oliver
    Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik.
    Tsiporkova, Elena
    Collective Center for the Belgian Technological Industry, BEL.
    Evolutionary clustering techniques for expertise mining scenarios2018In: ICAART 2018 - Proceedings of the 10th International Conference on Agents and Artificial Intelligence, Volume 2 / [ed] van den Herik J.,Rocha A.P., SciTePress, 2018, p. 523-530Conference paper (Refereed)
    Abstract [en]

    The problem addressed in this article concerns the development of evolutionary clustering techniques that can be applied to adapt the existing clustering solution to a clustering of newly collected data elements. We are interested in clustering approaches that are specially suited for adapting clustering solutions in the expertise retrieval domain. This interest is inspired by practical applications such as expertise retrieval systems where the information available in the system database is periodically updated by extracting new data. The experts available in the system database are usually partitioned into a number of disjoint subject categories. It is becoming impractical to re-cluster this large volume of available information. Therefore, the objective is to update the existing expert partitioning by the clustering produced on the newly extracted experts. Three different evolutionary clustering techniques are considered to be suitable for this scenario. The proposed techniques are initially evaluated by applying the algorithms on data extracted from the PubMed repository. Copyright © 2018 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved.

  • 50.
    Boström, Henrik
    et al.
    Department of Computer and Systems Sciences, Stockholm University, Kista, Sweden.
    Linusson, Henrik
    Department of Information Technology, University of Borås, Borås, Sweden.
    Löfström, Tuve
    Department of Information Technology, University of Borås, Borås, Sweden.
    Johansson, Ulf
    Jönköping University, School of Engineering, JTH, Computer Science and Informatics. Jönköping University, School of Engineering, JTH. Research area Computer Science and Informatics.
    Evaluation of a variance-based nonconformity measure for regression forests2016In: Conformal and Probabilistic Prediction with Applications, Springer, 2016, p. 75-89Conference paper (Refereed)
    Abstract [en]

    In a previous large-scale empirical evaluation of conformal regression approaches, random forests using out-of-bag instances for calibration together with a k-nearest neighbor-based nonconformity measure, was shown to obtain state-of-the-art performance with respect to efficiency, i.e., average size of prediction regions. However, the use of the nearest-neighbor procedure not only requires that all training data have to be retained in conjunction with the underlying model, but also that a significant computational overhead is incurred, during both training and testing. In this study, a more straightforward nonconformity measure is investigated, where the difficulty estimate employed for normalization is based on the variance of the predictions made by the trees in a forest. A large-scale empirical evaluation is presented, showing that both the nearest-neighbor-based and the variance-based measures significantly outperform a standard (non-normalized) nonconformity measure, while no significant difference in efficiency between the two normalized approaches is observed. Moreover, the evaluation shows that state-of-theart performance is achieved by the variance-based measure at a computational cost that is several orders of magnitude lower than when employing the nearest-neighbor-based nonconformity measure. 

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