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  • 1.
    Al Mamun, Abdullah
    et al.
    Division of Software Engineering Chalmers University of Technology and University of Gothenburg, Gothenburg, Sweden.
    Berger, Christian
    Division of Software Engineering Chalmers University of Technology and University of Gothenburg, Gothenburg, Sweden.
    Hansson, Jörgen
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Explicating, Understanding and Managing Technical Debt from Self-Driving Miniature Car Projects2014Inngår i: Proceedings 2014 6th IEEE International Workshop on Managing Technical Debt: MTD 2014, Los Alamitos, CA: IEEE Computer Society, 2014, s. 11-18Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Technical debt refers to various weaknesses in the design or implementation of a system resulting from trade-offs during software development usually for a quick release. Accumulating such debt over time without reducing it can seriously hamper the reusability and maintainability of the software. The aim of this study is to understand the state of the technical debt in the development of self-driving miniature cars so that proper actions can be planned to reduce the debt to have more reusable and maintainable software. A case study on a selected feature from two self-driving miniature car development projects is performed to assess the technical debt. Additionally, an interview study is conducted involving the developers to relate the findings of the case study with the possible root causes. The result of the study indicates that "the lack of knowledge" is not the primary reason for the accumulation of technical debt from the selected code smells. The root causes are rather in factors like time pressure followed by issues related to software/hardware integration and incomplete refactoring as well as reuse of legacy, third party, or open source code.

  • 2.
    Aliahmadipour, Laya
    et al.
    Department of Applied Mathematics, Faculty of Mathematics and Computer, Shahid Bahonar University of Kerman, Kerman, Iran.
    Torra, Vicenç
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Eslami, Esfandiar
    Department of Pure Mathematics, Faculty of Mathematics and Computer, Shahid Bahonar University of Kerman, Kerman, Iran.
    Eftekhari, Mahdi
    Department of Computer Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran.
    A definition for hesitant fuzzy partitions2016Inngår i: International Journal of Computational Intelligence Systems, ISSN 1875-6891, E-ISSN 1875-6883, Vol. 9, nr 3, s. 497-505Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, we define hesitant fuzzy partitions (H-fuzzy partitions) to consider the results of standard fuzzy clustering family (e.g. fuzzy c-means and intuitionistic fuzzy c-means). We define a method to construct H-fuzzy partitions from a set of fuzzy clusters obtained from several executions of fuzzy clustering algorithms with various initialization of their parameters. Our purpose is to consider some local optimal solutions to find a global optimal solution also letting the user to consider various reliable membership values and cluster centers to evaluate her/his problem using different cluster validity indices.

  • 3.
    Arias Ramos, Ceferino
    Högskolan i Skövde, Institutionen för teknik och samhälle.
    Programming and Image Processing in a Compact Production Cell2012Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    In recent years, control system in the automation industries has become more and more useful, covering a wide range of fields, for example, industrial instrumentation, control and monitoring systems. Vision systems are used nowadays to improve products quality control, saving costs, time, and obtaining a better accuracy than a human operator in the manufacturing process of companies. Combining a vision system with a suitable automated system allow companies to cover a wide range of products and rapid production. All these factors are considered in this project.

    The aim of this project is to upgrade the functionality of a Nokia-Cell, which was used in a quality control process for the back shells of Nokia cell phones. The project includes design, upgrade and implementation of a new system in order to make the cell work properly. The Nokia-Cell is composed of the following basic modules: vision and image recognition system, automation system devices (PC and PLC, robot), and other mechatronics devices. The new system will consist of a new camera, due to the poor connectivity and quality of the old camera. For the same reason, a new PC will replace two older ones for communication and vision recognition. The new system will also include a new PLC of Beckhoff to replace the aging one of Omron so as to facilitate the connections using the same language. In addition, IEC-61499 Function Blocks standard is adopted for programming the Nokia-Cell.

    It is expected that the results of this project will contribute to both research and education in the future. In addition, it would be correctly to apply the results to industries in vision-based quality control systems.

    Fulltekst (pdf)
    Programming and Image Processing in a Production Compact Cell
  • 4.
    Athanasopoulos, George
    et al.
    Department of Econometrics and Business Statistics, Monash University, Australia.
    Kourentzes, Nikolaos
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    On the evaluation of hierarchical forecasts2023Inngår i: International Journal of Forecasting, ISSN 0169-2070, E-ISSN 1872-8200, Vol. 39, nr 4, s. 1502-1511Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The aim of this paper is to provide a thinking road-map and a practical guide to researchers and practitioners working on hierarchical forecasting problems. Evaluating the performance of hierarchical forecasts comes with new challenges stemming from both the structure of the hierarchy and the application context. We discuss several relevant dimensions for researchers and analysts: the scale and units of the time series, the issue of intermittency, the forecast horizon, the importance of multiple evaluation windows and the multiple objective decision context. We conclude with a series of practical recommendations. 

  • 5.
    Ayani, Mikel
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Birtic, Martin
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Optimizing Cycle Time and Energy Efficiency of a Robotic Cell Using an Emulation Model2018Inngår i: Advances in Manufacturing Technology XXXII: Proceedings of the 16th International Conference on Manufacturing Research, incorporating the 33rd National Conference on Manufacturing Research, September 11–13, 2018, University of Skövde, Sweden / [ed] Peter Thorvald, Keith Case, Amsterdam: IOS Press, 2018, Vol. 8, s. 411-416Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Industrial automated systems are mostly designed and pre-adjusted to always work at their maximum production rate. This leaves room for important energy consumption reductions considering the production rate variations of factories in reality. This article presents a multi-objective optimization application targeting cycle time and energy consumption of a robotic cell. A novel approach is presented where an existing emulation model of a fictitious robotic cell was extended with low-level electrical components modeled and encapsulated as FMUs. The model, commanded by PLC and Robot Control software, was subjected to a multi-objective optimization algorithm in order to find the Pareto front between energy consumption and production rate. The result of the optimization process allows selecting the most efficient energy consumption for the robotic cell in order to achieve the required cycle.

  • 6.
    Barrera Diaz, Carlos Alberto
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Oscarsson, Jan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Lidberg, Simon
    Manufacturing Engineering, Research and Simulation, Volvo Car Corporation, Skövde, Sweden.
    Sellgren, Tommy
    Manufacturing Engineering, Research and Simulation, Volvo Car Corporation, Skövde, Sweden.
    Discrete Event Simulation Output Data-Handling System in an Automotive Manufacturing Plant2018Inngår i: Procedia Manufacturing, E-ISSN 2351-9789, Vol. 25, s. 8s. 23-30Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Discrete Event Simulation is a comprehensive tool for the analysis and design of manufacturing systems. Over the years, considerable efforts to improve simulation processes have been made. One step in these efforts is the standardisation of the output data through the development of an appropriate system which presents the results in a standardised way. This paper presents the results of a survey based on simulation projects undertaken in the automotive industry. In addition, it presents the implementation of an automated output data-handling system which aims to simplify the project’s documentation task for the simulation engineers and make the results more accessible for other stakeholders.

    Fulltekst (pdf)
    fulltext
  • 7.
    Berg Marklund, Björn
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Backlund, Per
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Dahlin, Carl-Johan
    ius information AB, Skövde, Sweden.
    Engström, Henrik
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Wilhelmsson, Ulf
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    A Game-Based Approach to Support Social Presence and Awareness in Distributed Project-Based Learning2014Inngår i: International Journal of Games Based Learning, ISSN 2155-6849, E-ISSN 2155-6857, Vol. 4, nr 1, s. 1-20Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An important factor for success in project-based learning (PBL) is that the involved project groups establish an atmosphere of social interaction in their working environment. In PBL-scenarios situated in distributed environments, most of a group's work-processes are mediated through the use of production-focused tools that are unconcerned with the important informal and social aspects of a project. On the other hand, there are plenty of tools and platforms that focus on doing the opposite and mainly support informal bonding (e.g., Facebook), but these types of environments can be obtrusive and contain distractions that can be detrimental to a group's productivity and are thus often excluded from working environments. The aim of this paper is to examine how a game-based multi-user environment (MUVE) can be designed to support project-based learning by bridging the gap between productivity-focused and social software. To explore this, the authors developed a game-based MUVE which was evaluated in a PBL-scenario. The result of the study revealed several crucial design elements that are needed to make such a MUVE work effectively, and that the acceptance towards game-based MUVEs is high, even with a rudimentary execution.

  • 8.
    Bergqvist, Emil
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Auditory displays: A study in effectiveness between binaural and stereo audio to support interface navigation2014Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    This thesis analyses if the change of auditory feedback can improve the effectiveness of performance in the interaction with a non-visual system, or with a system used by individuals with visual impairment. Two prototypes were developed, one with binaural audio and the other with stereo audio. The interaction was evaluated in an experiment where 22 participants, divided into two groups, performed a number of interaction tasks. A post-interview were conducted together with the experiment. The result of the experiment displayed that there were no great difference between binaural audio and stereo regarding the speed and accuracy of the interaction. The post-interviews displayed interesting differences in the way participants visualized the virtual environment that affected the interaction. This opened up interesting questions for future studies.

    Fulltekst (pdf)
    Bergqvist, E., Thesis
  • 9.
    Bergström, Erik
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Pehrsson, Helen
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Performance Assessments in Computer Science - An example of student perceptions2014Inngår i: Next Generation Learning Conference: Conference Summary / [ed] Erik Brunnert Walfridsson, 2014, s. 4-16Konferansepaper (Fagfellevurdert)
    Fulltekst (pdf)
    fulltext
  • 10.
    Bjurén, Johan
    Högskolan i Skövde, Institutionen för informationsteknologi.
    USING CASE-BASED REASONING FOR PREDICTING ENERGY USAGE2013Independent thesis Advanced level (degree of Master (Two Years)), 30 poäng / 45 hpOppgave
    Abstract [en]

    In this study, the inability to in a future meet the electricity demand and the urge to change the consumption behavior considered. In a smart grid context there are several possible ways to do this. Means include ways to increase the consumer’s awareness, add energy storages or build smarter homes which can control the appliances. To be able to implement these, indications on how the future consumption will be could be useful. Therefore we look further into how a framework for short-term consumption predictions can be created using electricity consumption data in relation to external factors. To do this a literature study is made to see what kind of methods that are relevant and which qualities is interesting to look at in order to choose a good prediction method. Case Based Reasoning seemed to be able to be suitable method. This method was examined further and built using relational databases. After this the method was tested and evaluated using datasets and evaluation methods CV, MBE and MAPE, which have previously been used in the domain of consumption prediction. The result was compared to the results of the winning methods in the ASHRAE competition. The CBR method was expected to perform better than what it did, and still not as good as the winning methods from the ASHRAE competition. The result showed that the CBR method can be used as a predictor and has potential to make good energy consumption predictions. and there is room for improvement in future studies.

    Fulltekst (pdf)
    fulltext
  • 11.
    Butler, Simon
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Gamalielsson, Jonas
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Lundell, Björn
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Brax, Christoffer
    Combitech AB, Linköping, Sweden.
    Mattsson, Anders
    Husqvarna AB, Huskvarna, Sweden.
    Gustavsson, Tomas
    PrimeKey Solutions AB, Stockholm, Sweden.
    Feist, Jonas
    RedBridge AB, Stockholm, Sweden.
    Kvarnström, Bengt
    Saab AB, Linköping, Sweden.
    Lönroth, Erik
    Scania CV AB, Södertälje, Sweden.
    Considerations and challenges for the adoption of open source components in software-intensive businesses2022Inngår i: Journal of Systems and Software, ISSN 0164-1212, E-ISSN 1873-1228, Vol. 186, artikkel-id 111152Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Component-Based Software Development is a conventional way of working for software-intensive businesses and OpenSource Software (OSS) components are frequently considered by businesses for adoption and inclusion in softwareproducts. Previous research has found a variety of practices used to support the adoption of OSS components, in-cluding formally specified processes and less formal, developer-led approaches, and that the practices used continue todevelop. Evolutionary pressures identified include the proliferation of available OSS components and increases in thepace of software development as businesses move towards continuous integration and delivery. We investigate workpractices used in six software-intensive businesses in the primary and secondary software sectors to understand currentapproaches to OSS component adoption and the challenges businesses face establishing effective work practices to eval-uate OSS components. We find businesses have established processes for evaluating OSS components and communitiesthat support more complex and nuanced considerations of the cost and risks of component adoption alongside matterssuch as licence compliance and functional requirements. We also found that the increasing pace and volume of softwaredevelopment within some businesses provides pressure to continue to evolve software evaluation processes.

    Fulltekst (pdf)
    fulltext
  • 12.
    Casas-Roma, Jordi
    et al.
    Faculty of Computer Science, Multimedia and Telecommunications, Internet Interdisciplinary Institute (IN3), Universitat Oberta de Catalunya, Barcelona, Spain.
    Herrera-Joancomartí, Jordi
    Department of Information and Communications Engineering, Universitat Autònoma de Barcelona, Bellaterra, Spain.
    Torra, Vicenç
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    A survey of graph-modification techniques for privacy-preserving on networks2017Inngår i: Artificial Intelligence Review, ISSN 0269-2821, E-ISSN 1573-7462, Vol. 47, nr 3, s. 341-366Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Recently, a huge amount of social networks have been made publicly available. In parallel, several definitions and methods have been proposed to protect users’ privacy when publicly releasing these data. Some of them were picked out from relational dataset anonymization techniques, which are riper than network anonymization techniques. In this paper we summarize privacy-preserving techniques, focusing on graph-modification methods which alter graph’s structure and release the entire anonymous network. These methods allow researchers and third-parties to apply all graph-mining processes on anonymous data, from local to global knowledge extraction.

  • 13.
    Crowston, Kevin
    et al.
    Syracuse University, Syracuse, NY, USA.
    Hammouda, ImedUniversity of Gothenburg, Sweden.Lundell, BjörnHögskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.Robles, GregorioGSyC, Universidad Rey Juan Carlos, Madrid, Spain.Gamalielsson, JonasHögskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.Lindman, JuhoChalmers, Gothenburg, Sweden ; University of Gothenburg, Gothenburg, Sweden.
    Open Source Systems: Integrating Communities: 12th IFIP WG 2.13 International Conference, OSS 2016, Gothenburg, Sweden, May 30 - June 2, 2016, Proceedings2016Collection/Antologi (Fagfellevurdert)
    Abstract [en]

    This book constitutes the refereed proceedings of the 12th International IFIP WG 2.13 International Conference on Open Source Systems, OSS 2016, held in Gothenburg, Sweden, in May/June 2016. The 13 revised full papers presented were carefully reviewed and selected from 38 submissions. The papers cover a wide range of topics related to free, libre, and open source software, including: organizational aspects of communities; organizational adoption; participation of women; software maintenance and evolution; open standards and open data; collaboration; hybrid communities; code reviews; and certification.

  • 14.
    Dahlbom, Anders
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Nordlund, Per-Johan
    Aeronautics, Saab AB, Linköping, Sweden.
    Detection of Hostile Aircraft Behaviors using Dynamic Bayesian Networks2013Inngår i: Proceedings of the 16th International Conference on Information Fusion, IEEE Press, 2013, s. 2033-2040Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Aircraft Combat Survivability in military air operations is concerned with survival of the own aircraft. This entails analysis of information, detection and estimation of threats, and the implementation of actions to counteract detected threats. Beyond visual range weapons can today be fired from one hundred kilometers away, making them difficult to detect and track. One approach for providing early warnings of such threats is to analyze the kinematic behavior of enemy aircraft in order to detect situations that may point to malicious intent. In this paper we investigate the use of dynamic Bayesian networks for detecting hostile aircraft behaviors.

  • 15.
    Danielsson, Oscar
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningsmiljön Virtuell produkt- och produktionsutveckling.
    Augmented reality smart glasses as assembly operator support: Towards a framework for enabling industrial integration2020Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Operators are likely to continue to play an integral part in industrial assembly for the foreseeable future. This is in part because increasingly shorter life-cycles and increased variety of products makes automation harder to achieve. As technological advancements enables greater digitalization, the demands for increased individual designs of products increases. These changes, combined with a global competition, does put an increasing strain on operators to handle large quantities of information in a short timeframe. Augmented reality (AR) has been identified as a technology that can present assembly information to operators in an efficient manner. AR smart glasses (ARSG) is an implementation of AR suitable for operators since they are hands-free and can provide individual instructions in the correct context directly in their real work environment. There are currently early adopters of ARSG in production within industry and there are many predictions that ARSG usage will continue to grow. However, to fully integrate ARSG as a tool among others in a modern and complex factory there are several perspectives that a company need to take into consideration. This thesis investigates both the operator perspective and the manufacturing engineering perspective to support industry in how to make the correct investment decisions as regards to ARSG.

    The aim of this licentiate thesis is to provide a basis for a framework to enable industry to choose and integrate ARSG in production as a value adding operator support. This is achieved by investigating the theoretical basis of ARSG related technology and its maturity as well as the needs operators have in ARSG for their usage in assembly. The philosophical paradigm that is followed is that of pragmatism. The methodology used is design science, set in the research paradigm of mixed methods. Data has been collected through experiments with demonstrators, interviews, observations, and literature reviews. This thesis provides partial answers to the overall research aim.

    The thesis shows that the topic is feasible, relevant to industry, and a novel scientific contribution. Observations, interviews, and a literature review gave an overview of the operator perspective. Some highlights from the results are that operators are willing to work with ARSG, that operators need help in unlearning old tasks as well as learning new ones, and that optimal weight distribution of ARSG is dependent on the operators’ head-positioning. Highlights from the preliminary findings for the manufacturing engineering perspective include a general lack of standards for AR as regards vertical industrial application, improved tools for faster instruction generation, and large variations in specifications of available ARSG.

    Future work includes a complete answer to the manufacturing engineering perspective as well as combining all the results to create a framework for ARSG integration in industry.

    Fulltekst (pdf)
    fulltext
  • 16.
    Derenius, Fredrik
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Framställandet av en säker LiveCD för distansarbetare: Ett projekt baserat på öppen källkod2012Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Studien ämnar undersöka hur en LiveCD kan stödja en säkrare datormiljö för distansarbetarepå ett enkelt sätt. Distansarbetare arbetar utanför arbetsplatsens säkrare datormiljö vilket gördem till en mer utsatt grupp av datoranvändare. Många av dagens datoranvändare tyckerdessutom säkerhet relaterat till datorer och nätverk är komplicerat. Implementerad lösningtillhandahåller därför möjligheten att med hjälp av en LiveCD och ett USB-minne få tillgångtill både en säker fjärranslutning och fjärrskrivbord, genom att enbart skriva in ett lösenord.Tjänsterna konfigureras alltså automatiskt i bakgrunden; användaren behöver inte hålla redapå mer än ett lösenord. En LiveCD är också ett skrivskyddat medium vilket innebär attskadlig kod har svårt att få fäste i systemet. Resultatet är att distansarbetare med olika behovoch kunskapsnivå gällande dator- och nätverksäkerhet erbjuds möjligheten till en säkraredatormiljö på ett enkelt sätt.

    Fulltekst (pdf)
    fulltext
  • 17.
    Ding, Jianguo
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi. Department of Computer Science, Blekinge Institute of Technology, Karlskrona, Sweden.
    Naserinia, Vahid
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Blockchain for future renewable energy2022Inngår i: Decentralized Frameworks for Future Power Systems: Operation, Planning and Control Perspectives / [ed] Mohsen Parsa Moghaddam; Reza Zamani; Hassan Haes Alhelou; Pierluigi Siano, Academic Press, 2022, s. 129-146Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    To better optimize and control the renewable energy system and its integration with traditional grid systems and other energy systems, corresponding technologies are needed to meet its growing practical application requirements: decentralized management and control, support for decentralized decision-making, fine-grained and timely data sharing, maintain data and business privacy, support fast and low-cost electricity market transactions, maintain the security and reliability of system operation data, and prevent malicious cyberattacks. Blockchain is based on core technologies such as distributed ledgers, asymmetric encryption, consensus mechanisms, and smart contracts and has some excellent features such as decentralization, openness, independence, security, and anonymity. These characteristics seem to meet the technical requirements of future renewable energy systems partially. This chapter will systematically review how blockchain technology can potentially solve the challenges with decentralized solutions for future renewable energy systems and show a guideline to implement blockchain-based corresponding applications for future renewable energy. 

  • 18.
    Einevik, Johan
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Kurri, John
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap.
    Emulering av en produktioncell med Visionguidning: Virtuell idrifttagning2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Genom att använda sig utav en virtuell kopia utav en produktionscell kan programmering och funktionstester av olika paneler testas i ett tidigt stadie. En virtuell kopia bidrar också till enklare felsökning och minskning av kostnader vid idrifttagning. Tanken med projektet är att undersöka i vilken utsträckning som emuleringsmodellen kan ersätta den riktiga cellen vid ett funktionstest för leverantören. Det som också undersöks är i vilken utsträckning riktiga CAD-ritningar kan användas och vilka krav som ställs på ritningarna för att underlätta emulering. Projektet hade flera utmaningar och en av dem som uppkom under projektets gång var problemet med att det inte gick att emulera säkerhetssystemen. Detta löstes genom att bygla alla säkerhetskretsar i PLC-programmet. En viktig del i emulering är kommunikation mellan de olika programvarorna i systemet. I projektets visade det sig fördelaktigt att dela upp programmen i emuleringssystemet för att fördela resurserna över tre datorer. Att använda sig utav en emuleringsmodell istället för en riktig produktionscell är fortfarande i forskningsstadiet men genom projektet har många användningsområden identifierats och skulle kunna förändra idrifttagning i framtiden.

    Fulltekst (pdf)
    fulltext
  • 19.
    Ekanayake, Hiran
    et al.
    Stockholm University, Forum 100, Kista, Sweden ; University of Colombo School of Computing, Sri Lanka.
    Backlund, Per
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Ziemke, Tom
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Ramberg, Robert
    Stockholm University, Forum 100, Kista, Sweden.
    Hewagamage, Kamalanath P.
    University of Colombo School of Computing.
    Lebram, Mikael
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Comparing Expert and Novice Driving Behavior in a Driving Simulator2013Inngår i: Interaction Design and Architecture(s) Journal - IxD&A, ISSN 1826-9745, nr 19, s. 115-131Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a study focused on comparing driving behavior of expert and novice drivers in a mid-range driving simulator with the intention of evaluating the validity of driving simulators for driver training. For the investigation, measurements of performance, psychophysiological measurements, and self-reported user experience under different conditions of driving tracks and driving sessions were analyzed. We calculated correlations

    between quantitative and qualitative measures to enhance the reliability of the findings. The experiment was conducted involving 14 experienced drivers and 17 novice drivers. The results indicate that driving behaviors of expert and novice drivers differ from each other in several ways but it heavily depends on the characteristics of the task. Moreover, our belief is that the analytical framework proposed in this paper can be used as a tool for selecting appropriate driving tasks as well as for evaluating driving performance in driving simulators.

  • 20.
    Ekelund, Kalle
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Q-Learning: Ett sätt att lära agenter att spela fotboll2013Independent thesis Basic level (university diploma), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Den artificiella intelligensen i spel brukar ofta använda sig utav regelbaserade tekniker för dess beteende. Detta har gjort att de artificiella agenterna blivit förutsägbara, vilket är väldigt tydligt för sportspel. Det här arbetet har utvärderat ifall inlärningstekniken Q-learning är bättre på att spela fotboll än en regelbaserade tekniken tillståndsmaskin. För att utvärdera detta har en förenklad fotbollssimulering skapats. Där de båda lagen har använts sig av varsin teknik. De båda lagen har sedan spelat 100 matcher mot varandra för att se vilket lag/teknik som är bäst. Statistik ifrån matcherna har använts som undersökningsresultat. Resultatet visar att Q-learning är en bättre teknik då den vinner flest match och skapar flest chanser under matcherna. Diskussionen efteråt handlar om hur användbart Q-learning är i ett spelsammanhang.

    Fulltekst (pdf)
    a10kalek_examensarbete
  • 21.
    Ericsson, AnnMarie
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Berndtsson, Mikael
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Detecting Design Errors in Composite Events for Event Triggered Real-Time Systems Using Timed Automata2006Inngår i: SCW 2006: IEEE Services Computing Workshops: 18-22 September 2006, Chicago, Illinois: Proceedings / [ed] Malu Castellanos, Jian Yang, IEEE, 2006, s. 39-47Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Many applications need to detect and respond to occurring events and combine these event occurrences into new events with a higher level of abstraction. Specifying how events can be combined is often supported by design tools specific to the current event processing engine. However, the issue of ensuring that the combinations of events provide the system with the correct combination of information is often left to the developer to analyze. We argue that analyzing correctness of event composition is a complex task that needs tool support. In this paper we present a novel development tool for specifying composition of events with time constraints. One key feature of our tool is to automatically transform composite events for real-time systems into a timed automaton representation. The timed automaton representation allow us to check for design errors, for example, whether the outcome of combining events with different operators in different consumption policies is consistent with the requirement specification

  • 22.
    Eriksson, Fredrik
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Modell för lösenordsklassning: Utveckling av lösenordsklassificering2017Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [sv]

    I dagens samhälle är datorer ett naturligt inslag i vår vardag. För de flesta anses datorn vara ett verktyg för att hjälpa dem genom arbetet såväl som i vardagen. Dock finns det en mörkare sida där personer använder sig utav datorn för att begå brott. Den så kallade IT-relaterade brottsligheten ökar och ökar och enligt Brå:s rapport från 2016 har en ökning på 949 % skett i Sverige mellan 2006 till 2015 enligt den officiella kriminalstatistiken vad gäller brott som har IT-inslag (Andersson, Hedqvist, Ring & Skarp, 2016).

    För att få fast förövarna krävs det medel för att kunna bevisa att ett brott har begåtts. Ett sätt att göra detta är att gå in i datorn för att leta efter bevis. Om den misstänkte förövaren känner till att det finns möjlighet för denne att komma att bli granskad vad händer då? Möjligheter finns att förövaren försöker göra det så svårt som möjligt att ta sig in datorn. Detta kan då ske genom att kryptera systemet genom att använda sig av en så kallad krypteringsalgoritm för att låsa hårddisken. Denna kryptering kan vara väldigt svår att dekryptera och det kan vara enklare att försöka få tag i det rätta lösenordet istället.

    Denna studie har till syfte att utveckla en modell för lösenordsklassificering. Genom denna modell kan strategier som används när användare skapar sina lösenord identifieras och klassificeras. Detta bidrar till en ökad kunskap om strategier användare har när de skapar lösenord. Då fulldiskkryptering börjar bli en vanligare metod för att hindra någon obehörig från att ta sig in i systemet finns förhoppningen om att modellen ska kunna användas och utvecklas till att skapa ett ramverk för att underlätta arbetet för forensikerna hos polisen samt andra rättsvårdande myndigheter. Med denna modell kan olika strategier som olika typer av användare använder sig av när de skapar lösenord vara av sådan karaktär att de kan klassificeras in i en egen kategori. Om en sådan klassificering kan göras skulle det underlätta arbetet för IT-forensikerna och påskynda processen med att knäcka lösenord.

    Studien utförs genom att använda en kvalitativ metod samt validering utav modellen. Genom kvalitativa intervjuer samlas information in som sedan analyseras och används för att utveckla en modell för lösenordsklassificering. Arbetet med att utveckla en modell för lösenordsklassificering har bestått av en iterativ process där återkoppling gjorts gentemot de olika intervjuobjekten. Ett utkast till en modell med grund i befintlig forskning skapades. Utkastet diskuterades sedan med de olika intervjuobjekten, som deltagit i studien, i en iterativ process där modellen uppdaterades och återkopplades mot de olika intervjuobjekten. Validering av modellen har genomförts genom att fånga in riktiga lösenord som läckts ut på Internet och sedan testa dessa lösenord mot modellen för lösenordsklassificering.

    Fulltekst (pdf)
    fulltext
  • 23.
    Ferm, Linus
    Högskolan i Skövde, Institutionen för informationsteknologi. ferm.ferm@hotmail.se.
    How the graphical representation of the HUD affects the usability of a third person game2018Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    The HUD is what allows players to interact with the game world and therefore the visual representation of it is of importance to usability. Usability being broken down into three components: effectiveness, efficiency and satisfaction. To study the subject a third person action game was made for the purpose. The game contained two different HUD versions to test different approaches to UI design. Results for the study were, in relation to usability, inconclusive due to a lack of participants and varying degrees of experience within the pool of participants. Preferences were gathered however, and preferences towards the stylized HUD were shown. Further study is promising as other genres could more easily adapt theories from other software fields.

    Fulltekst (pdf)
    fulltext
  • 24.
    Ferm, Linus
    Högskolan i Skövde, Institutionen för informationsteknologi.
    How the Graphical Representation of the HUD Affects the Usability of a Third Person Game2018Independent thesis Basic level (degree of Bachelor of Fine Arts), 20 poäng / 30 hpOppgave
    Abstract [en]

    The HUD is what allows players to interact with the game world and therefore thevisual representation of it is of importance to usability. Usability being broken down intothree components: effectiveness, efficiency and satisfaction. To study the subject athird person action game was made for the purpose. The game contained two differentHUD versions to test different approaches to UI design. Results for the study were, inrelation to usability, inconclusive due to a lack of participants and varying degrees ofexperience within the pool of participants. Preferences were gathered however, andpreferences towards the stylized HUD were shown. Further study is promising as othergenres could more easily adapt theories from other software fields.

    Fulltekst (pdf)
    fulltext
  • 25.
    Fox Franke, Daniel
    et al.
    Akamai Technologies, Cambridge, USA.
    Sibold, Dieter
    Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.
    Teichel, Kristof
    Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.
    Dansarie, Marcus
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi. Försvarshögskolan, Militärvetenskapliga institutionen (MVI), Avdelningen för ledningsvetenskap och militärteknik (ALM), Sektionen för militärtekniska tillämpningar (MteT).
    Sundblad, Ragnar
    Netnod, Sweden.
    Network Time Security for the Network Time Protocol2020Rapport (Fagfellevurdert)
    Abstract [en]

    This memo specifies Network Time Security (NTS), a mechanism for using Transport Layer Security (TLS) and Authenticated Encryption with Associated Data (AEAD) to provide cryptographic security for the client-server mode of the Network Time Protocol (NTP).

    NTS is structured as a suite of two loosely coupled sub-protocols. The first (NTS Key Establishment (NTS-KE)) handles initial authentication and key establishment over TLS. The second (NTS Extension Fields for NTPv4) handles encryption and authentication during NTP time synchronization via extension fields in the NTP packets, and holds all required state only on the client via opaque cookies.

  • 26.
    Frick, Erik
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Dynamisk grafik med WebGL och Canvas: Atlas och context-switch2015Independent thesis Basic level (university diploma), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Att ha grafiska applikationer i webben har blivit allt mer vanligt sedan World Wide Web kom till i slutet på 80-talet. Till en början handlade det om effektfulla interaktiva element så som reklamskyltar, logotyper och menyknappar. Idag år 2015 har webbläsarna utvecklats så pass långt att inga tredjepartsprogram krävs för att interaktiv grafik ska fungera, vilket tidigare var fallet. Grafiska funktioner och bibliotek finns nu istället inbyggda i webbläsaren. De tekniker som denna rapport/arbete ska behandla är Canvas och WebGL. Dessa är tekniker som används för att presentera interaktiv grafik på webben. WebGL är ett grafiskt bibliotek som bygger på ett känt grafiskt bibliotek vid namnet OpenGL, men konstruerat för webben. Grafiken är hårdvaruaccelererad precis som OpenGL, vilket innebär att tekniken kan åstadkomma relativt kraftfull grafik för att vara en webbapplikation. För en utbildad webbutvecklare kan WebGL upplevas som en svårare värld jämfört med Canvas som ligger närmare en webbutvecklares kunskapsområde. Canvas har även en större tillgänglighet bland webbläsare än WebGL. Detta arbete ska redovisa hur dessa två tekniker förhåller sig till varandra i utritningshastighet tillsammans med en bildteknik kallad Atlas. Atlas teknik är enkelt förklarat när ett bildobjekt är som en atlas med flertal bildobjekt där i som hade kunnat motsvara separata bildobjekt. Detta examensarbete kommer jämföra alla fallen i ett experiment för att kunna ge svar på hur prestanda i utritningshastighet står sig mellan teknikerna Canvas och WebGL med eller utan Atlas teknik.

    Fulltekst (pdf)
    fulltext
  • 27.
    Gamalielsson, Jonas
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lundell, Björn
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    On Involvement in Open Standards: How Do Organisations Contribute to W3C Standards Through Editorship?2016Inngår i: Open Source Systems: Integrating Communities: 12th IFIP WG 2.13 International Conference, OSS 2016, Gothenburg, Sweden, May 30 - June 2, 2016, Proceedings / [ed] Kevin Crowston; Imed Hammouda; Björn Lundell; Gregorio Robles; Jonas Gamalielsson; Juho Lindman, Cham: Springer, 2016, 1, Vol. 472, s. 57-70Kapittel i bok, del av antologi (Fagfellevurdert)
    Abstract [en]

    Over the years, a number of open standards have been developed and implemented in software for addressing a number of challenges, such as lock-in, interoperability and longevity of software systems and associated digital artefacts. Understanding organisational involvement and collaboration in standardisation is important for informing any future policy and organisational decisions concerning involvement in standardisation. The overarching goal of the study is to establish how organisations contribute to open standards development through editorship. Specifically, the focus is on open standards development in W3C. Through an analysis of editorship for all W3C recommendations we contribute novel findings concerning organisational involvement and collaboration, and highlight contributions from different types of organisations and countries for headquarter of each organisation. We make three principal contributions. First, we establish an overall characterisation of organisational involvement in W3C standardisation. Second, we report on organisational involvement in W3C standardisation over time. Third, we establish organisational collaboration in W3C standardisation through social network analysis.

  • 28.
    Gamalielsson, Jonas
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Lundell, Björn
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Grahn, Alexander
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Andersson, Stefan
    RedBridge AB, Kista, Sweden.
    Feist, Jonas
    RedBridge AB, Kista, Sweden.
    Gustavsson, Tomas
    PrimeKey Solutions AB, Solna, Sweden.
    Strindberg, Henrik
    Findwise AB, Göteborg, Sweden .
    Towards a reference model on how to utilise Open Standards in Open Source projects: experiences based on Drupal2013Inngår i: Open Source Software: Quality Verification / [ed] Etiel Petrinja; Giancarlo Succi; Nabil El Ioini; Alberto Sillitti, Springer Berlin/Heidelberg, 2013, s. 257-263Konferansepaper (Fagfellevurdert)
    Abstract [en]

    It is known that standards implemented in Open Source software (OSS) can promote a competitive market, reduce the risk for lock-in and improve interoperability, whilst there is limited knowledge concerning the relationship between standards and their implementations in OSS. In this paper we report from an ongoing case study conducted in the context of the ORIOS (Open Source software Reference Implementations of Open Standards) project in which influences between OSS communities and software standard communities are investigated. The study focuses on the Drupal project and three of its implemented standards (RDFa, CMIS, and OpenID).

  • 29.
    Gellerstedt, Martin
    Department for Studies of Work, Economics and Health, University of Trollhättan, Uddevalla, Sweden.
    Statistical issues: significantly important in medical research2002Inngår i: Allergy. European Journal of Allergy and Clinical Immunology, ISSN 0105-4538, E-ISSN 1398-9995, Vol. 57, nr 2, s. 76-82Artikkel, forskningsoversikt (Annet vitenskapelig)
  • 30.
    Ghorbani, Ali
    et al.
    University of New Brunswick, Canada.
    Torra, VincençHögskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.Hişil, HüseyinYasar University, Turkey.Miri, AliRyerson University, Canada.Koltuksuz, AhmetYasar University, Turkey.Zhang, JieNanyang Technological University, Singapore.Sensoy, MuratOzyegin University, Turkey.García-Alfaro, JoaquínTélécom SudParis, France.Zincir, IbrahimYasar University, Turkey.
    2015 Thirteenth Annual Conference on Privacy, Security and Trust2015Konferanseproceedings (Fagfellevurdert)
  • 31.
    Goienetxea Uriarte, Ainhoa
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Urenda Moris, Matías
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Ng, Amos H. C.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Oscarsson, Jan
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningscentrum för Virtuella system.
    Lean, Simulation and Optimization: A Win-Win combination2016Inngår i: Proceedings of the 2015 Winter Simulation Conference / [ed] L. Yilmaz, W. K. V. Chan, I. Moon, T. M. K. Roeder, C. Macal, and M. D. Rossetti, Piscataway, New Jersey: IEEE Computer Society, 2016, s. 2227-2238Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Lean and simulation analysis are driven by the same objective, how to better design and improve processes making the companies more competitive. The adoption of lean has been widely spread in companies from public to private sectors and simulation is nowadays becoming more and more popular. Several authors have pointed out the benefits of combining simulation and lean, however, they are still rarely used together in practice. Optimization as an additional technique to this combination is even a more powerful approach especially when designing and improving complex processes with multiple conflicting objectives. This paper presents the mutual benefits that are gained when combining lean, simulation and optimization and how they overcome each other´s limitations. A framework including the three concepts, some of the barriers for its implementation and a real-world industrial example are also described.

  • 32.
    Grünloh, Christiane
    et al.
    School of Computer Science and Communication, KTH Royal Institute of Technology, Stockholm, Sweden / Institute of Informatics, Technische Hochschule Köln, University of Applied Sciences, Gummersbach, Germany.
    Myreteg, Gunilla
    Department of Business Studies, Uppsala University, Uppsala, Sweden.
    Cajander, Åsa
    Department of Information Technology, Uppsala University, Uppsala, Sweden.
    Rexhepi, Hanife
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    "why do they need to check me?" patient participation through ehealth and the doctor-patient relationship: Qualitative study2018Inngår i: Journal of Medical Internet Research, E-ISSN 1438-8871, Vol. 20, nr 1, artikkel-id e11Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: Roles in the doctor-patient relationship are changing and patient participation in health care is increasingly emphasized. Electronic health (eHealth) services such as patient accessible electronic health records (PAEHRs) have been implemented to support patient participation. Little is known about practical use of PAEHR and its effect on roles of doctors and patients. Objective: This qualitative study aimed to investigate how physicians view the idea of patient participation, in particular in relation to the PAEHR system. Hereby, the paper aims to contribute to a deeper understanding of physicians' constructions of PAEHR, roles in the doctor-patient relationship, and levels and limits of involvement. Methods: A total of 12 semistructured interviews were conducted with physicians in different fields. Interviews were transcribed, translated, and a theoretically informed thematic analysis was performed. Results: Two important aspects were identified that are related to the doctor-patient relationship: roles and involvement. The physicians viewed their role as being the ones to take on the responsibility, determining treatment options, and to be someone who should be trusted. In relation to the patient's role, lack of skills (technical or regarding medical jargon), motives to read, and patients' characteristics were aspects identified in the interviews. Patients were often referred to as static entities disregarding their potential to develop skills and knowledge over time. Involvement captures aspects that support or hinder patients to take an active role in their care. Conclusions: Literature of at least two decades suggests an overall agreement that the paternalistic approach in health care is inappropriate, and a collaborative process with patients should be adopted. Although the physicians in this study stated that they, in principle, were in favor of patient participation, the analysis found little support in their descriptions of their daily practice that participation is actualized. As seen from the results, paternalistic practices are still present, even if professionals might not be aware of this. This can create a conflict between patients who strive to become more informed and their questions being interpreted as signs of critique and mistrust toward the physician. We thus believe that the full potential of PAEHRs is not reached yet and argue that the concept of patient empowerment is problematic as it triggers an interpretation of "power" in health care as a zero-sum, which is not helpful for the maintenance of the relationship between the actors. Patient involvement is often discussed merely in relation to decision making; however, this study emphasizes the need to include also sensemaking and learning activities. This would provide an alternative understanding of patients asking questions, not in terms of "monitoring the doctor" but to make sense of the situation.

    Fulltekst (pdf)
    fulltext
  • 33.
    Gustavsson, Per M.
    et al.
    Saab, Sweden ; C4I Center, George Mason University, United States.
    Hieb, Michael R.
    C4I Center, George Mason University, United States.
    Niklasson, Lars
    Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
    Moore, Philip
    De Montfort University, United Kingdom.
    Eriksson, Patric
    De Montfort University, United Kingdom.
    Formalizing operations intent and effects for network-centric applications2009Inngår i: Proceedings of the 42nd Annual Hawaii International Conference on System Sciences, HICSS: 5-8 January 2009 Waikoloa, Big Island, Hawaii / [ed] Ralph H. Sprague Jr., IEEE Computer Society, 2009Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A Network-Centric approach enables systems to be interconnected in a dynamic and flexible architecture to support multi-lateral, civilian and military missions. Constantly changing environments require commanders to plan for more flexible missions that allow organizations from various nations and agencies to join or separate from the teams performing the missions, depending on the situation. The uncertainty inherent in an actual mission, and the variety of potential organizations that support the mission after it is underway, makes Command Intent (CI) a critical concept for the mission team. Both humans and computerized decision support services need to have the ability to communicate and interpret a shared CI. This paper presents the Operations Intent and Effects Model (OIEM) - a model that relates CI to Effects, and supports both traditional military planning and Effects Based Operation. In the provided example the suggested Command and Control Language is used to express Operations Intent and Effects. © 2009 IEEE.

  • 34.
    Hallin, Jonas
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Svärm-AI i shooters2015Independent thesis Basic level (university diploma), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Svärm-AI är en variant av artificiell intelligens (AI) som används för att simulera ett bettende liknande det man kan se i svärmar, flockar eller stim. Syftet med detta arbete är att undersöka ifall man kan använda svärm-AI för att förbättra en AI i ett top down shooter spel där två lag slåss mot varandra. Ett program skapades för att testa detta där de två lagen båda var datorstyrda enheter och fick slåss mot varandra för att samla mätvärden. Resultaten visar att svärm-AI presterade bättre i labyrintliknande banor utan stora tomma områden. De visade även att svärm-AI använde betydligt mycket mer prestanda.

    Fulltekst (pdf)
    fulltext
  • 35.
    Hansson, Jörgen
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Helton, Steve
    The Boeing Company, USA.
    Feiler, Peter H.
    Carnegie Mellon University, Software Engineering Institute, Pittsburgh, PA, USA.
    ROI Analysis of the System Architecture Virtual Integration Initiative2018Rapport (Annet vitenskapelig)
    Abstract [en]

    The System Architecture Virtual Integration (SAVI) initiative is a multiyear, multimillion dollar program that is developing the capability to virtually integrate systems before designs are implemented and tested on hardware. The purpose of SAVI is to develop a means of countering the costs of exponentially increasing complexity in modern aerospace software systems. The program is sponsored by the Aerospace Vehicle Systems Institute, a research center of the Texas Engineering Experiment Station, which is a member of the Texas A&M University System. This report presents an analysis of the economic effects of the SAVI approach on the development of software-reliant systems for aircraft compared to existing development paradigms. The report describes the detailed inputs and results of a return-on-investment (ROI) analysis to determine the net present value of the investment in the SAVI approach. The ROI is based on rework cost-avoidance attributed to earlier discovery of requirements errors through analysis of virtually integrated models of the embedded software system expressed in the SAE International Architecture Analysis and Design Language (AADL) standard architecture modeling language. The ROI analysis uses conservative estimates of costs and benefits, especially for those parameters that have a proven, strong correlation to overall system-development cost. The results of the analysis, in part, show that the nominal cost reduction for a system that contains 27 million source lines of code would be $2.391 billion (out of an estimated $9.176 billion), a 26.1% cost savings. The original study, reported here, had a follow-on study to validate and further refine the estimated cost savings.

  • 36.
    Heljegård, Filip
    Högskolan i Skövde, Institutionen för informationsteknologi.
    HTML5 Canvas object rendering: Rendering av olika objekt i olika webbläsare2015Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Denna rapport tar upp tester av renderingstider av olika Canvas objekt. Objeken är unika från varandra och pressar olika webbläsare för att ta reda på information om renderingsmotorn i webbläsaren.

    Fulltekst (pdf)
    HTML5 Canvas object rendering
  • 37.
    Hernández Rentería, Luis Alejandro
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Gamified layer for Google Classroom to improve the user experience and engagement of students with ADHD2017Independent thesis Advanced level (degree of Master (One Year)), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    The implementation of a Course Management System into an educational institution oriented to students with learning disabilities such as ADHD,  represents a big challenge since these students experience persistent impairments in attention (or concentration) that impact negatively on their learning outcomes, engagement and motivation. It’s crucial to adapt and enhance these environments having in consideration the students’ special learning needs, in order to improve their user experience and engagement during their learning process. This thesis address the design and development of gamified layer that brings a current analog gamification practice into a Course Management System Environment, Google Classroom (GC). The prototype developed retrieves, transforms and shows the GC data in form of game elements such as points, badges, and progress bars, among others. After using the prototype during three weeks, the students showed an easy familiarization with the gamified layer of GC and an active participation and persistence during their course activities.

    Fulltekst (pdf)
    gamified-layer-googleclassroom-adhd
  • 38.
    Hesselbom, Anton
    Högskolan i Skövde, Institutionen för informationsteknologi.
    Neuroevolution med tävlingsinriktad samevolution i flera miljöer med ökande komplexitet2017Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    NEAT är en neuroevolutionsteknik som kan användas för att träna upp AI-kontrollerade robotar utan att behöva tillföra någon mänsklig expertis eller tidigare kunskap till systemet. Detta arbete undersöker hur väl denna teknik fungerar tillsammans med samevolution för att utveckla robotar i en tävlingsmiljö, med fokus på att testa tekniken på flera olika nivåer med varierande mängd komplexitet i form av väggar och hinder.

    Tekniken utvärderas genom att låta robotarna tävla mot varandra, deras kompetens mäts sedan från resultaten av dessa tävlingar. Exempelvis deras förmåga att vinna matcher.

    Resultaten visar att tekniken fungerade bra på nivån med låg komplexitet, men att robotarna har vissa svårigheter att lära sig kompetenta strategier på nivåerna med högre komplexitet. Tekniken har dock potential för flera olika varianter och förbättringar som potentiellt kan förbättra resultatet även på de mer komplexa nivåerna.

    Fulltekst (pdf)
    fulltext
  • 39.
    Holgersson, Jesper
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningscentrum för Informationsteknologi. Linköping University, Sweden.
    Melin, Ulf
    Linköping University, Sweden.
    Lindgren, Ida
    Linköping University, Sweden.
    Axelsson, Karin
    Linköping University, Sweden.
    Exploring User Participation Practice in Public E-Service Development: Why, How and in Whose Interest?2018Inngår i: The Electronic Journal of e-Government, ISSN 1479-439X, Vol. 16, nr 1, s. 72-86Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    User participation is seen as an important enabler for successful public e-service development. However, at the same time development of public e-services is still often characterised by an internal government perspective with little consideration for external users’ perspectives. This paper challenges the overly positive attitude that is surrounding user participation in e-government research. The paper aims to illustrate and problematize various aspects that influence why, how, and in whose interest user participation is conducted in public e-service development. First, via a literature review, we identify a set of dimensions for critically exploring how, why, and in whose interest user participation is conducted in public e-service development projects. Second, we use these dimensions in order to characterise and analyse three empirical public e-service development cases in order to test the utility, usefulness, and feasibility of the identified dimensions. Our findings highlight the importance of questioning and elaborating on the motives behind user participation (the why) in public e-service development. We also identify two basic forms of how user participation is addressed in public e-service development projects: 1) veneered participation, and 2) ad-hoc participation. Furthermore, we argue that any decisions made regarding user participation in public e-service development should be based on conscious and informed choices concerning why user participation is needed and what it may bring for different stakeholders and their interests.

    Fulltekst (pdf)
    fulltext
  • 40.
    Huskaj, Gazmend
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi. Swedish Defence University, Stockholm, Sweden.
    Iftimie, Ion A.
    NATO Defense College, Rome, Italy / European Union Research Center, George Washington School of Business, Washington, DC, United States.
    Wilson, Richard L.
    Towson University, United States / Hoffberger Center for Professional Ethics, University of Baltimore, United States.
    Designing attack infrastructure for offensive cyberspace operations2020Inngår i: Proceedings of the 19th European Conference on Cyber Warfare and Security: a virtual conference hosted by University of Chester UK 25-26 June 2020 / [ed] Thaddeus Eze, Lee Speakman, Cyril Onwubiko, Reading, UK: Academic Conferences and Publishing International Limited, 2020, s. 473-482Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This article addresses the question ‘what considerations should be taken by cyber commands when designing attack infrastructure for offensive operations?’. Nation-states are investing in equipping units tasked to conduct offensive cyberspace operations. Generating ‘deny, degrade, disrupt, destroy or deceive’ effects on adversary targets requires to move from own (‘green’), through neutral (‘grey’), to adversary (‘red’) cyberspace. The movement is supported by attack infrastructure for offensive cyberspace operations. In this paper, we review the professional and scientific literature identifying the requirements for designing an attack infrastructure. Next, we develop and define the concepts for attack infrastructure. Finally, we explain and describe the considerations for designing attack infrastructure. The research question is answered by proposing a framework for designing attack infrastructure. This framework is vital for military and civilian commands designing attack infrastructure for offensive cyberspace operations. 

  • 41.
    Iftimie, Ion A.
    et al.
    NATO Defense College, Rome, Italy / European Union Research Center, George Washington School of Business, Washington, D.C. / Central European University, Vienna, Austria.
    Huskaj, Gazmend
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi. Swedish Defence University, Stockholm, Sweden.
    Strengthening the cybersecurity of smart grids: The role of artificial intelligence in resiliency of substation intelligent electronic devices2020Inngår i: Proceedings of the 19th European Conference on Cyber Warfare and Security: a virtual conference hosted by University of Chester UK 25-26 June 2020 / [ed] Thaddeus Eze, Lee Speakman, Cyril Onwubiko, Reading, UK: Academic Conferences and Publishing International Limited, 2020, s. 143-150Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Executive Order 13800—Strengthening the Cybersecurity of Federal Networks and Critical Infrastructure—issued by the President of the United States, calls for an evaluation of the “readiness and gaps in the United States’ ability to manage and mitigate consequences of a cyber incident against the electricity subsector.” In May of 2018, the Office of Management and Budget finished evaluating the 96 risk assessments conducted by various agencies and published Federal Cybersecurity Risk Determination Report and Action Plan (Risk Report). While the report embraced a broad defending forward strategy, it made no reference to smart grids or their vulnerable intelligent substations and did not address how federal agencies plan to respond to emerging threats to these systems. While the paper does not discuss how to attack the smart grids in the cyber domain, the contribution to the academic debate lies in validating some of the vulnerabilities of the grid’s substations in order for government, private industry, academia, and civil society to better collaborate in disrupting or halting malicious cyber activities before they disrupt the power supply of the United States and its Transatlantic allies. We also discuss how Artificial Intelligence and related techniques can mitigate security risks to cyber-physical systems. Until this technology becomes available, however, standardization of cyber security efforts must be enforced through regulatory means, such as the enforcement of security-by-design Intelligent Electronic Devices and protocols for the smart grid. 

  • 42.
    Igelmo, Victor
    et al.
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningsmiljön Virtuell produkt- och produktionsutveckling.
    Syberfeldt, Anna
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningsmiljön Virtuell produkt- och produktionsutveckling.
    Hansson, Jörgen
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Aslam, Tehseen
    Högskolan i Skövde, Institutionen för ingenjörsvetenskap. Högskolan i Skövde, Forskningsmiljön Virtuell produkt- och produktionsutveckling.
    Enabling Industrial Mixed Reality Using Digital Continuity: An Experiment Within Remanufacturing2022Inngår i: SPS2022: Proceedings of the 10th Swedish Production Symposium / [ed] Amos H. C. Ng; Anna Syberfeldt; Dan Högberg; Magnus Holm, Amsterdam; Berlin; Washington, DC: IOS Press, 2022, s. 497-507Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In the digitalisation era, overlaying digital, contextualised information on top of the physical world is essential for an efficient operation. Mixed reality (MR) is a technology designed for this purpose, and it is considered one of the critical drivers of Industry 4.0. This technology has proven to have multiple benefits in the manufacturing area, including improving flexibility, efficacy, and efficiency. Among the challenges that prevent the big-scale implementation of this technology, there is the authoring challenge, which we address by answering the following research questions: (1) “how can we fasten MR authoring in a manufacturing context?” and (2) “how can we reduce the deployment time of industrial MR experiences?”. This paper presents an experiment performed in collaboration with Volvo within the remanufacturing of truck engines. MR seems to be more valuable for remanufacturing than for many other applications in the manufacturing industry, and the authoring challenge appears to be accentuated. In this experiment, product lifecycle management (PLM) tools are used along with internet of things (IoT) platforms and MR devices. This joint system is designed to keep the information up-to-date and ready to be used when needed. Having all the necessary data cascading from the PLM platform to the MR device using IoT prevents information silos and improves the system’s overall reliability. Results from the experiment show how the interconnection of information systems can significantly reduce development and deployment time. Experiment findings include a considerable increment in the complexity of the overall IT system, the need for substantial investment in it, and the necessity of having highly qualified IT staff. The main contribution of this paper is a systematic approach to the design of industrial MR experiences.

    Fulltekst (pdf)
    fulltext
  • 43.
    Istanbullu, Alexander
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Prestandajämförelse av textbaserade och binära dataformat för AJAX2013Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [sv]

    Introduktionen av AJAX har möjliggjort skapandet av dynamiska webbapplikationer på Internet. Dessa dynamiska webbapplikationer bygger på att skicka data mellan klient och server med hjälp av asynkrona förfrågningar. Detta görs med hjälp av ett serialiseringsformat som används för att kompaktera data och möjliggöra kommunikation mellan olika programmeringsspråk. Binära serialiseringsformat har konsistent visat sig prestera bättre än de textbaserade alternativen på plattformar som tillåter binär transport av data. AJAX är en plattform som endast tillåter textbaserad transport av data. Detta arbete syftar till att jämföra prestandan av textbaserade och binära serialiseringsformat för AJAX med hjälp av bland annat round-trip time. Arbetet har utförts genom att skapa en webbapplikation som utför prestandamätningar med hjälp av olika datamängder med varierande storlek och innehåll. Resultaten visar att binära serialiseringsformat endast skulle kunna vara ett tänkbart alternativ när det rör sig om webbapplikationer som skickar mycket sifferdominant data.

    Fulltekst (pdf)
    Prestandajämförelse av textbaserade och binära dataformat för AJAX
  • 44.
    Javeed, Ashir
    et al.
    Aging Research Center, Karolinska Institutet, Stockholm, Sweden ; Department of Health, Blekinge Institute of Technology, Karlskrona, Sweden.
    Saleem, Muhammad Asim
    Center of Excellence in Artificial Intelligence, Machine Learning and Smart Grid Technology, Department of Electrical Engineering, Chulalongkorn University, Bangkok, Thailand.
    Dallora, Ana Luiza
    Department of Health, Blekinge Institute of Technology, Karlskrona, Sweden.
    Ali, Liaqat
    Department of Electrical Engineering, University of Science and Technology Bannu, Pakistan.
    Sanmartin Berglund, Johan
    Department of Health, Blekinge Institute of Technology, Karlskrona, Sweden.
    Anderberg, Peter
    Högskolan i Skövde, Institutionen för hälsovetenskaper. Högskolan i Skövde, Forskningsmiljön hälsa, hållbarhet och digitalisering. Department of Health, Blekinge Institute of Technology, Karlskrona, Sweden.
    Decision Support System for Predicting Mortality in Cardiac Patients Based on Machine Learning2023Inngår i: Applied Sciences, E-ISSN 2076-3417, Vol. 13, nr 8, artikkel-id 5188Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Researchers have proposed several automated diagnostic systems based on machine learning and data mining techniques to predict heart failure. However, researchers have not paid close attention to predicting cardiac patient mortality. We developed a clinical decision support system for predicting mortality in cardiac patients to address this problem. The dataset collected for the experimental purposes of the proposed model consisted of 55 features with a total of 368 samples. We found that the classes in the dataset were highly imbalanced. To avoid the problem of bias in the machine learning model, we used the synthetic minority oversampling technique (SMOTE). After balancing the classes in the dataset, the newly proposed system employed a (Formula presented.) statistical model to rank the features from the dataset. The highest-ranked features were fed into an optimized random forest (RF) model for classification. The hyperparameters of the RF classifier were optimized using a grid search algorithm. The performance of the newly proposed model ((Formula presented.) _RF) was validated using several evaluation measures, including accuracy, sensitivity, specificity, F1 score, and a receiver operating characteristic (ROC) curve. With only 10 features from the dataset, the proposed model (Formula presented.) _RF achieved the highest accuracy of 94.59%. The proposed model (Formula presented.) _RF improved the performance of the standard RF model by 5.5%. Moreover, the proposed model (Formula presented.) _RF was compared with other state-of-the-art machine learning models. The experimental results show that the newly proposed decision support system outperforms the other machine learning systems using the same feature selection module ((Formula presented.)). 

    Fulltekst (pdf)
    fulltext
  • 45.
    Jeusfeld, Manfred A.
    Tilburg University, Department of Information Management, The Netherlands.
    Metamodeling and method engineering with ConceptBase2009Inngår i: Metamodeling for Method Engineering / [ed] Manfred A. Jeusfeld; Matthias Jarke; John Mylopoulos, Cambridge, Massachusetts, USA: MIT Press, 2009, s. 89-168Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    This chapter provides a practical guide on how to use the meta datarepository ConceptBase to design information modeling methods by using meta-modeling. After motivating the abstraction principles behind meta-modeling, thelanguage Telos as realized in ConceptBase is presented. First, a standard factualrepresentation of statements at any IRDS abstraction level is defined. Then, thefoundation of Telos as a logical theory is elaborated yielding simple fixpointsemantics. The principles for object naming, instantiation, attribution, andspecialization are reflected by roughly 30 logical axioms. After the languageaxiomatization, user-defined rules, constraints and queries are introduced. The firstpart is concluded by a description of active rules that allows the specification ofreactions of ConceptBase to external events. The second part applies the languagefeatures of the first part to a full-fledged information modeling method: The Yourdanmethod for Modern Structured Analysis. The notations of the Yourdan method aredesigned along the IRDS framework. Intra-notational and inter-notational constraintsare mapped to queries. The development life cycle is encoded as a software processmodel closely related to the modeling notations. Finally, aspects managing themodeling activities are addressed by metric definitions.

    Fulltekst (pdf)
    fulltext
  • 46.
    Jeusfeld, Manfred
    et al.
    Högskolan i Skövde, Institutionen för kommunikation och information.
    Delcambre, Lois
    Ling, Tok Wang
    Preface: Special Section featuring extended papers from the 30th International Conference on Conceptual Modeling (ER-2011)2013Inngår i: Data & Knowledge Engineering, ISSN 0169-023X, E-ISSN 1872-6933, Vol. 87, s. 259-Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
    Abstract [en]

    The 30th International Conference on Conceptual Modeling (ER-2011) highlighted the strong and persistent interest in research on conceptual modeling for developing information systems. Topics included data modeling theory, goal modeling, socio-technical factors, requirements engineering, process modeling, and ontologies.

  • 47.
    Jiang, Yuning
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Vulnerability Analysis for Critical Infrastructures2022Doktoravhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    The rapid advances in information and communication technology enable a shift from diverse systems empowered mainly by either hardware or software to cyber-physical systems (CPSs) that are driving Critical infrastructures (CIs), such as energy and manufacturing systems. However, alongside the expected enhancements in efficiency and reliability, the induced connectivity exposes these CIs to cyberattacks exemplified by Stuxnet and WannaCry ransomware cyber incidents. Therefore, the need to improve cybersecurity expectations of CIs through vulnerability assessments cannot be overstated. Yet, CI cybersecurity has intrinsic challenges due to the convergence of information technology (IT) and operational technology (OT) as well as the crosslayer dependencies that are inherent to CPS based CIs. Different IT and OT security terminologies also lead to ambiguities induced by knowledge gaps in CI cybersecurity. Moreover, current vulnerability-assessment processes in CIs are mostly subjective and human-centered. The imprecise nature of manual vulnerability assessment operations and the massive volume of data cause an unbearable burden for security analysts. Latest advances in machine-learning (ML) based cybersecurity solutions promise to shift such burden onto digital alternatives. Nevertheless, the heterogeneity, diversity and information gaps in existing vulnerability data repositories hamper accurate assessments anticipated by these ML-based approaches. Therefore, a comprehensive approach is envisioned in this thesis to unleash the power of ML advances while still involving human operators in assessing cybersecurity vulnerabilities within deployed CI networks.Specifically, this thesis proposes data-driven cybersecurity indicators to bridge vulnerability management gaps induced by ad-hoc and subjective auditing processes as well as to increase the level of automation in vulnerability analysis. The proposed methodology follows design science research principles to support the development and validation of scientifically-sound artifacts. More specifically, the proposed data-driven cybersecurity architecture orchestrates a range of modules that include: (i) a vulnerability data model that captures a variety of publicly accessible cybersecurity-related data sources; (ii) an ensemble-based ML pipeline method that self-adjusts to the best learning models for given cybersecurity tasks; and (iii) a knowledge taxonomy and its instantiated power grid and manufacturing models that capture CI common semantics of cyberphysical functional dependencies across CI networks in critical societal domains. This research contributes data-driven vulnerability analysis approaches that bridge the knowledge gaps among different security functions, such as vulnerability management through related reports analysis. This thesis also correlates vulnerability analysis findings to coordinate mitigation responses in complex CIs. More specifically, the vulnerability data model expands the vulnerability knowledge scope and curates meaningful contexts for vulnerability analysis processes. The proposed ML methods fill information gaps in vulnerability repositories using curated data while further streamlining vulnerability assessment processes. Moreover, the CI security taxonomy provides disciplined and coherent support to specify and group semanticallyrelated components and coordination mechanisms in order to harness the notorious complexity of CI networks such as those prevalent in power grids and manufacturing infrastructures. These approaches learn through interactive processes to proactively detect and analyze vulnerabilities while facilitating actionable insights for security actors to make informed decisions.

    Fulltekst (pdf)
    fulltext
  • 48.
    Jiang, Yuning
    et al.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Atif, Yacine
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    An Approach to Discover and Assess Vulnerability Severity Automatically in Cyber-Physical Systems2020Inngår i: Proceedings of the 13th International Conference on Security of Information and Networks: November 4-6, 2020, virtual, Istanbul, Turkey / [ed] Berna Örs, Atilla Elçi, New York, NY, USA: Association for Computing Machinery (ACM), 2020, artikkel-id 9Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Current vulnerability scoring mechanisms in complex cyber-physical systems (CPSs) face challenges induced by the proliferation of both component versions and recurring scoring-mechanism versions. Different data-repository sources like National Vulnerability Database (NVD), vendor websites as well as third party security tool analysers (e.g. ICS CERT and VulDB) may provide conflicting severity scores. We propose a machine-learning pipeline mechanism to compute vulnerability severity scores automatically. This method also discovers score correlations from established sources to infer and enhance the severity consistency of reported vulnerabilities. To evaluate our approach, we show through a CPS-based case study how our proposed scoring system automatically synthesises accurate scores for some vulnerability instances, to support remediation decision-making processes. In this case study, we also analyse the characteristics of CPS vulnerability instances. 

    Fulltekst (pdf)
    fulltext
  • 49.
    Jiang, Yuning
    et al.
    Högskolan i Skövde, Forskningsmiljön Informationsteknologi. Högskolan i Skövde, Institutionen för informationsteknologi.
    Jeusfeld, Manfred A.
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Ding, Jianguo
    Högskolan i Skövde, Institutionen för informationsteknologi. Högskolan i Skövde, Forskningsmiljön Informationsteknologi.
    Evaluating the Data Inconsistency of Open-Source Vulnerability Repositories2021Inngår i: ARES 2021: The 16th International Conference on Availability, Reliability and Security, Association for Computing Machinery (ACM), 2021, s. 1-10, artikkel-id 86Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Modern security practices promote quantitative methods to provide prioritisation insights and support predictive analysis, which is supported by open-source cybersecurity databases such as the Common Vulnerabilities and Exposures (CVE), the National Vulnerability Database (NVD), CERT, and vendor websites. These public repositories provide a way to standardise and share up-to-date vulnerability information, with the purpose to enhance cybersecurity awareness. However, data quality issues of these vulnerability repositories may lead to incorrect prioritisation and misemployment of resources. In this paper, we aim to empirically analyse the data quality impact of vulnerability repositories for actual information technology (IT) and operating technology (OT) systems, especially on data inconsistency. Our case study shows that data inconsistency may misdirect investment of cybersecurity resources. Instead, correlated vulnerability repositories and trustworthiness data verification bring substantial benefits for vulnerability management. 

    Fulltekst (pdf)
    fulltext
  • 50.
    Johansson, Alfred
    Högskolan i Skövde, Institutionen för informationsteknologi.
    HTTP Load Balancing Performance Evaluation of HAProxy, NGINX, Traefik and Envoy with the Round-Robin Algorithm2022Independent thesis Basic level (degree of Bachelor), 20 poäng / 30 hpOppgave
    Abstract [en]

    Operating a popular website is a challenging task. Users not only expect services to always be available, but also good performance in the form of fast response times. To achieve high availability and avoid performance problems which can be linked to user satisfaction and financial losses, the ability to balance web server traffic between servers is an important aspect.

    This study is aimed to evaluate performance aspects of popular open-source load balancing software working at the HTTP layer. The study includes the well-known load balancers HAProxy and NGINX but also Traefik and Envoy which have become popular more recently by offering native integration with container orchestrators. To find performance differences, an experiment was designed with two load scenarios using Apache JMeter to measure the throughput of requests and response times with a varying number of simulated users.

    The experiment was able to consistently show performance differences between the software in both scenarios. It was found that HAProxy overall had the best performance in both scenarios and could handle test cases with 1000 users where the other load balancers began generating a large proportion of failed connections significantly better. NGINX was the slowest when considering all test cases from both scenarios. Averaging results from both load scenarios excluding tests at the highest, 1000 users, concurrency level, Traefik performed 24% better, Envoy 27% better and HAProxy 36% better compared to NGINX.

    Fulltekst (pdf)
    fulltext
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