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  • 301.
    Amirijoo, Mehdi
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    Son, Sang H.
    Department of Computer Science University of Virgina.
    Hansson, Jörgen
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    QoD Adaptation for Achieving Lifetime Predictability of WSN Nodes Communicating over Satellite Links2007In: International Conference on Networked Sensing Systems INSS,2007, IEEE , 2007, p. 19-26Conference paper (Refereed)
    Abstract [en]

    In this paper we propose an architecture consisting of a particular type of node, namely a communication server that collects and aggregates data, and establishes a link between the users and the sensor nodes through satellite communication. A key challenge with satisfying a lifetime requirement of the communication server is the unpredictability of the sensor data volume arriving at the communication server and the transmission power of the satellite terminal. To provide lifetime predictability we propose an approach that automatically adjusts the quality of the data such that the specified lifetime if achieved. We have shown through an extensive evaluation that the approach manages to provide an actual lifetime within 2% of the specified lifetime despite variations in workload and communication link quality.

  • 302.
    Amirijoo, Mehdi
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    Tesanovic, Aleksandra
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    Andersson, Torgny
    Enea Epact.
    Hansson, Jörgen
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    Son, Sang H.
    Department of Computer Science University of Virginia, USA.
    Finite Horizon QoS Prediction of Reconfigurable Firm Real-Time Systems2006In: IEEE International Conference on Embedded and Real-Time Computing Systems and Applications,2006, Los Alamitos, California, USA: IEEE Computer Society , 2006, p. 233-Conference paper (Refereed)
    Abstract [en]

    Updating real-time system software is often needed in response to errors and added requirements to the software. Stopping a running application, updating the software, and then restarting the application is not suitable for systems with high availability requirements. On the other hand, dynamically updating a system may increase the execution time of the tasks, thus, degrading the performance of the system. Degradation is not acceptable for performance-critical real-time systems as there are strict requirements on the performance. In this paper we present an approach that enables dynamic reconfiguration of a real-time system, where the performance of the system during a reconfiguration satisfies a given worst-case performance specification. Evaluation shows that the presented method is efficient in guaranteeing the worst-case performance of dynamically reconfigurable firm real-time systems. 

  • 303.
    Amirijoo, Mehdi
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    Tesanovic, Aleksandra
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    Nadjm-Tehrani, Simin
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, RTSLAB - Real-Time Systems Laboratory.
    Raising Motivation in Real-time Laboratories: The Soccer Scenario2004In: Technical Symposium on Computer Science Education, SIGCSE,2004, USA: Association for Computing Machinery (ACM) , 2004, p. 265-Conference paper (Refereed)
    Abstract [en]

    Real-time systems is a topic that one cannot overlook in an engineer's education. However, teaching real-time systems in an undergraduate syllabus is a challenging experience due to conflicting constraints placed on such a course. In this paper we present a new setup for laboratories in the real-time systems course that successfully meets the constraints of mass education, stable environment management, short time span for the labs, and still enables deep involvement of students in the central topic of resource allocation with high motivation.

  • 304.
    Amlinger, Anton
    Linköping University, Department of Computer and Information Science, Software and Systems. Linköping University, Faculty of Science & Engineering.
    An Evaluation of Clustering and Classification Algorithms in Life-Logging Devices2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Using life-logging devices and wearables is a growing trend in today’s society. These yield vast amounts of information, data that is not directly overseeable or graspable at a glance due to its size. Gathering a qualitative, comprehensible overview over this quantitative information is essential for life-logging services to serve its purpose.

    This thesis provides an overview comparison of CLARANS, DBSCAN and SLINK, representing different branches of clustering algorithm types, as tools for activity detection in geo-spatial data sets. These activities are then classified using a simple model with model parameters learned via Bayesian inference, as a demonstration of a different branch of clustering.

    Results are provided using Silhouettes as evaluation for geo-spatial clustering and a user study for the end classification. The results are promising as an outline for a framework of classification and activity detection, and shed lights on various pitfalls that might be encountered during implementation of such service.

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  • 305.
    Ammenwerth, Elske
    et al.
    Univ Hlth Sci Med Informat & Technol UMIT, Austria.
    Duftschmid, Georg
    Med Univ Vienna, Austria.
    Al-Hamdan, Zaid
    Jordan Univ Sci & Technol, Jordan.
    Bawadi, Hala
    Univ Jordan, Jordan.
    Cheung, Ngai T.
    Hosp Author, Peoples R China.
    Cho, Kyung-Hee
    Seoul Natl Univ, South Korea.
    Goldfarb, Guillermo
    Hosp Ninos Dr Ricardo Gutierrez, Argentina.
    Gulkesen, Kemal H.
    Akdeniz Univ, Turkey.
    Harel, Nissim
    Holon Inst Technol, Israel.
    Kimura, Michio
    Hamamatsu Univ, Japan.
    Kirca, Onder
    Mem & Medstar Oncol Ctr, Turkey.
    Kondoh, Hiroshi
    Tottori Univ Hosp, Japan.
    Koch, Sabine
    Department of Learning, Informatics, Management and Ethics, Health Informatics Centre, Karolinska Institutet, Stockholm, Sweden.
    Lewy, Hadas
    Holon Inst Technol, Israel.
    Mize, Dara
    Vanderbilt Univ, TN 37235 USA.
    Palojoki, Sari
    Univ Eastern Finland, Finland.
    Park, Hyeoun-Ae
    Seoul Natl Univ, South Korea.
    Pearce, Christopher
    Outcome Hlth, Australia.
    de Quiros, Fernan G. B.
    Hosp Italiano Buenos Aires, Argentina.
    Saranto, Kaija
    Univ Eastern Finland, Finland.
    Seidel, Christoph
    Minist Social Affairs Hlth & Equal Opportun, Germany.
    Vimarlund, Vivian
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Science & Engineering.
    Were, Martin C.
    Vanderbilt Univ, TN USA.
    Westbrook, Johanna
    Macquarie Univ, Australia.
    Wong, Chung P.
    Hong Kong Soc Med Informat, Peoples R China.
    Haux, Reinhold
    TUBraunschweig, Germany; Hannover Med Sch, Germany.
    Lehmann, Christoph U.
    Univ Texas Southwestern Med Ctr Dallas, TX 75390 USA.
    International Comparison of Six Basic eHealth Indicators Across 14 Countries: An eHealth Benchmarking Study2020In: Methods of Information in Medicine, ISSN 0026-1270, Vol. 59, no S2, p. e46-e63Article in journal (Refereed)
    Abstract [en]

    Background Many countries adopt eHealth applications to support patient-centered care. Through information exchange, these eHealth applications may overcome institutional data silos and support holistic and ubiquitous (regional or national) information logistics. Available eHealth indicators mostly describe usage and acceptance of eHealth in a country. The eHealth indicators focusing on the cross-institutional availability of patient-related information for health care professionals, patients, and care givers are rare. Objectives This study aims to present eHealth indicators on cross-institutional availability of relevant patient data for health care professionals, as well as for patients and their caregivers across 14 countries (Argentina, Australia, Austria, Finland, Germany, Hong Kong as a special administrative region of China, Israel, Japan, Jordan, Kenya, South Korea, Sweden, Turkey, and the United States) to compare our indicators and the resulting data for the examined countries with other eHealth benchmarks and to extend and explore changes to a comparable survey in 2017. We defined "availability of patient data" as the ability to access data in and to add data to the patient record in the respective country. Methods The invited experts from each of the 14 countries provided the indicator data for their country to reflect the situation on August 1, 2019, as date of reference. Overall, 60 items were aggregated to six eHealth indicators. Results Availability of patient-related information varies strongly by country. Health care professionals can access patients most relevant cross-institutional health record data fully in only four countries. Patients and their caregivers can access their health record data fully in only two countries. Patients are able to fully add relevant data only in one country. Finland showed the best outcome of all eHealth indicators, followed by South Korea, Japan, and Sweden. Conclusion Advancement in eHealth depends on contextual factors such as health care organization, national health politics, privacy laws, and health care financing. Improvements in eHealth indicators are thus often slow. However, our survey shows that some countries were able to improve on at least some indicators between 2017 and 2019. We anticipate further improvements in the future.

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  • 306.
    Amolegbe, Elvira
    et al.
    Linköping University, Department of Computer and Information Science.
    Berggren, Jakob
    Linköping University, Department of Computer and Information Science.
    Burman, Frans
    Linköping University, Department of Computer and Information Science.
    Falk, Axel
    Linköping University, Department of Computer and Information Science.
    Folkunger, Philip
    Linköping University, Department of Computer and Information Science.
    Nyreröd Granath, Lars
    Linköping University, Department of Computer and Information Science.
    Waller, Alice
    Linköping University, Department of Computer and Information Science.
    Wallhem, Max
    Linköping University, Department of Computer and Information Science.
    Åström, Daniel
    Linköping University, Department of Computer and Information Science.
    Usability of a subscription-based book service: - How can a web application for a subscription-based book service be designed to reduce the number of clicks and improve subjective user experiences for given tasks in the aspect of usability?2022Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    To increase the number of customers buying from a web application, theory states that the application needs to be easy to use. In this study, navigability and usability will be investigated and tested on a web-based book-subscription service. The purpose of this study is to come to new conclusions regarding what is important for navigability and usability for subscription services that target students. A web application was created for an online book club subscription service for students at Linköping University. It was created in two different iterations where each iteration was tested on 12 students, which according to theory is a sufficient number of testers. The first iteration was designed based on theory and the second was redesigned based on the input from the test users. Counting the number of clicks taken by the user was the main method used for evaluating navigability, while Concurrent Thinking Aloud, System Usability Scale and Retrospective Probing Procedure were the methods used to measure usability. The most considerable changes made between the two iterations were the updating of the filtering function on the find book club page and the implementation of a search function on the same page. This was also the page where the most improvement in the number of clicks was made. In line with the theory, the usability improved in the tests after changes had been made that test users had commented on. The number of clicks did mostly decrease in the second iteration but not in all categories. This result does not mean that the user experience was not improved since some requested functionality was implemented that required additional clicks.

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    Usability of a subscription-based book service
  • 307.
    Amundsson, Martin
    Linköping University, Department of Computer and Information Science.
    Långtidscovid: symptomförlopp och mönster över tid: En explorativ analys av crowdsource-insamlat enkätdata2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Two years after the first recorded outbreak of Covid-19 its long-term effects are still not completely understood. An unknown proportion of all covid patients go on to develop post-acute covid syndrome and suffer long-term symptoms and health effects long after the initial infection subsides. Project Crowdsourcing Långtidscovid-Sverige sent out in summer of 2021 an open online survey and gathered respondents through crowdsourcing to gather info about people in Sweden with prolonged health effects lasting at least three months after confirmed or suspected Covid-19 infection.

    In this thesis an explorative analysis of the aforementioned survey is conducted with its initial focus placed onthe progression of symptoms. Descriptive statistics are provided for the survey sample; hierarchical clusteringon principal components is performed; and association rule mining as well as sequence rule mining is used toextract frequently co-occurring symptoms.

    Women stand for 85.2% of all respondents, possibly indicating a skewed gender distribution in the sample. The average age of a respondent is 50 years old, but ranges between 18 and 80 years of age. The number of reported symptoms tend to diminish over time and symptoms within the 'air passages' category diminish on average quicker than other categories.

    Hierarchical clustering with Ward’s criterion revealed 4 clusters with an average silhouette coefficient of 0.246. The resulting clusters are not well-separated from each other and have some overlap in their bordering regions, and should therefore be interpreted with caution. Broadly speaking, individuals from cluster 1, 3 and 4 are distinguished primarily by their total number of symptoms reported, meanwhile cluster 2 is characterized by individuals that experience many symptoms early on and fewer symptoms later on.

    The most prevalent symptom over the entire period is fatigue (90.2%), closely followed by worsening symptomsafter physical activity (87.1%), problems with concentration (82.3%), headaches (79.5%), and brain fog (77.9%). There are several strong associations between various symptoms, especially for symptoms within the same category. Most symptoms have a sequential correlation with themselves and have an increased tendency to occur several times.

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  • 308.
    An, Ping
    Linköping University, Department of Computer and Information Science.
    An investigation of the use of software development environments in the industry2004Independent thesis Basic level (professional degree)Student thesis
    Abstract [en]

    Software engineering tools are being used in the industry in order to improve the productivity and the quality of the software development process. The properties of those tools are being perceived to be unsatisfactory. For example, researchers have found that some problems are due to deficient integration among the tools. Furthermore, a continuing problem is that there is a gap between the IT education and real demand of tool-skills form IT industry. Consequently, knowledge is needed of the properties of software development tools as well an understanding of demanded tool-skill from the industry.

    The purpose of this study is to survey commercial software development environment (SDEs) that are used today in professional software engineering and discuss their advantages adn disadvantages. A secondary goal of the study is to identify the actual requirements from the industry on the IT-education.

    A questionnaire was sent out to 90 software developers and IT managers of 30 IT companies in Sweden. The results of the survey show that IT companies, for most part, use SDEs from commercial software vendors. Respondents report that common problems of the SDEs are the following: bad integration among the tools, problems to trace software artifacts in the different phases of the programming cycle, and deficient support for version control and system configuration. Furthermore, some tools are difficult to use which results in a time-consuming development process.

    We conclude that future software development environments need to provide better support for integration, automation, and configuration management. Regarding the required tool-skills, we believe that the IT education would gain from including commercial tools that cover the whole software product lifecycle in the curriculum.

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    FULLTEXT01
  • 309.
    Ana, Kustrak Korper
    et al.
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Science & Engineering. University of Porto, Faculty of Engineering, INESC-TEC.
    Holmlid, Stefan
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Science & Engineering.
    Lia, Patrício
    University of Porto, Faculty of Engineering, INESC-TEC.
    Bridging design-driven and service innovation: Consonance and dissonance of meaning and value2018In: ServDes2018. Service Design Proof of Concept / [ed] Anna Meroni: Department of Design, Politecnico di Milano, Milan, Italy Ana María Ospina Medina: Department of Design, Politecnico di Milano, Italy Beatrice Villari: Politecnico di Milano, Italy, Linköping, 2018, article id 150:092Conference paper (Refereed)
    Abstract [en]

    Conceptualization of meaning in design-driven innovation and value in service innovation, seem to be sharing some core characteristics that are essential but have not yet been integrated. Thus, this paper explores design-driven innovation and its conceptual relevance for service innovation within the framework of service-dominant logic (S-D logic) by examining interrelation between meaning and value. Design-driven innovation is defined as a strategic framework that enables radical innovation through change in meaning relying on Krippendorff’s (1989) notion that people interact with artifacts because they make sense to them. On the other hand, S-D logic’s core concepts evolve around resource integration for value co-creation among multiple stakeholders addressing important complexities of service innovation. Both meaning and value share some conceptual commonalities. By exploring and interrelating them within their conceptual frameworks, this paper aims to open new ways for understanding and operationalizing service innovation and the role of service design within it.

  • 310.
    Anand, Abhijeet
    Linköping University, Department of Computer and Information Science, The Division of Statistics and Machine Learning.
    Point clouds in the application of Bin Picking2023Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Automatic bin picking is a well-known problem in industrial automation and computer vision, where a robot picks an object from a bin and places it somewhere else. There is continuous ongoing research for many years to improve the contemporary solution. With camera technology advancing rapidly and available fast computation resources, solving this problem with deep learning has become a current interest for several researchers. This thesis intends to leverage the current state-of-the-art deep learning based methods of 3D instance segmentation and point cloud registration and combine them to improve the bin picking solution by improving the performance and make them robust.

    The problem of bin picking becomes complex when the bin contains identical objects with heavy occlusion. To solve this problem, a 3D instance segmentation is performed with Fast Point Cloud Clustering (FPCC) method to detect and locate the objects in the bin. Further, an extraction strategy is proposed to choose one predicted instance at a time. Inthe next step, a point cloud registration technique is implemented based on PointNetLK method to estimate the pose of the selected object from the bin.

    The above implementation is trained, tested, and evaluated on synthetically generated datasets. The synthetic dataset also contains several noisy point clouds to imitate a real situation. The real data captured at the company ’SICK IVP’ is also tested with the implemented model.

    It is observed that the 3D instance segmentation can detect and locate the objects available in the bin. In a noisy environment, the performance degrades as the noise level increase. However, the decrease in the performance is found to be not so significant. Point cloud registration is observed to register best with the full point cloud of the object, when compared to point cloud with missing points.

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  • 311.
    Ananthakrishnan, Gopal
    et al.
    Centre for Speech Technology, KTH, Stockholm, Sweden.
    Eklund, Robert
    Linköping University, Department of Computer and Information Science, NLPLAB - Natural Language Processing Laboratory. Linköping University, The Institute of Technology.
    Peters, Gustav
    Forschungsinstitut Alexander Koenig, Bonn, Germany.
    Mabiza, Evans
    Antelope Park, Gweru, Zimbabwe.
    An acoustic analysis of lion roars. II: Vocal tract characteristics2011In: Proceedings from Fonetik 2011, Quarterly Progress and Status Report TMH-QPSR, Volume 51, 2011, 2011, p. 5-8Conference paper (Other academic)
    Abstract [en]

    This paper makes the first attempt to perform an acoustic-to-articulatory inversion of a lion (Panthera leo) roar. The main problems that one encounters in attempting this, is the fact that little is known about the dimensions of the vocal tract, other than a general range of vocal tract lengths. Precious little is also known about the articulation strategies that are adopted by the lion while roaring. The approach used here is to iterate between possible values of vocal tract lengths and vocal tract configurations. Since there seems to be a distinct articulatory changes during the process of a roar, we find a smooth path that minimizes the error function between a recorded roar and the simulated roar using a variable length articulatory model.

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  • 312.
    Andarzig, Kiana
    et al.
    Linköping University, Department of Computer and Information Science.
    Müller Rasmussen, Ilja
    Linköping University, Department of Computer and Information Science.
    Raattamaa, Niklas
    Linköping University, Department of Computer and Information Science.
    Dahlsberg, Victor
    Linköping University, Department of Computer and Information Science.
    Eshak, Jonatan
    Linköping University, Department of Computer and Information Science.
    Fröberg, Elise
    Linköping University, Department of Computer and Information Science.
    Särnhammar, Emanuel
    Linköping University, Department of Computer and Information Science.
    Marknadsplattform för träningsanläggningar2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport beskriver ett projekt som gjordes i kursen TDDD96 - Kandidatprojekt i programvaruutveckling vid Linköpings universitet under våren 2022. Projektets mål var att utveckla en marknadsplattform åt företaget Zoezi där deras kunder hade möjligheten attvisa upp sina tjänster. Resultatet av projektet är en framände skriven i TypeScript somutvecklades med hjälp av ramverket React, samt en bakände skriven i Python som utvecklades med hjälp av ramverket Flask. Rapporten redovisar även hur gruppen arbetademed utvecklingsmetoden Scrum samt andra metoder som användes under utvecklingenav produkten. Vidare så presenterar rapporten de erfarenheter som gruppmedlemmarnahar erhållit under arbetets gång.De slutsatser som gruppen kommit fram till är att det är viktigt att sätta upp tydligabegränsningar och att ha rak kommunikation med beställaren för att skapa värde för kunden; gruppen har erhållit många erfarenheter under projektets gång, framförallt om hurman arbetar i grupp; en systemanatomi kan vara till stöd för en grupp, framförallt i börjanav ett projekt; agila arbetssätt har både positiva och negativa effekter på grupparbeten.Dessutom innehåller rapporten sju individuella delar som skrivits av gruppmedlemmarna och som behandlar ämnen relaterade till projektet.

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  • 313.
    Andell, Anton
    et al.
    Linköping University, Department of Computer and Information Science.
    Cole, Nigel
    Linköping University, Department of Computer and Information Science.
    Karlsson, Wiktor
    Linköping University, Department of Computer and Information Science.
    Lilja, Eric
    Linköping University, Department of Computer and Information Science.
    Rezaie, Diba
    Linköping University, Department of Computer and Information Science.
    Thimren, David
    Linköping University, Department of Computer and Information Science.
    Zeijlon, Andreas
    Linköping University, Department of Computer and Information Science.
    CI/CD i molnapplikationer som Google Cloud, Azure och AWS2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Under VT 2019 ägde projektet rum varav denna rapport är ett av resultaten. Projektets mål var att skapa en CI/CD pipeline vars syfte var tänkt att frekvent kunna leverera färdigtestad kod till olika molntjänster som Google Cloud Platform, Amazon Web Services och Azure. Projektspecifikationerna gavs av företaget Skira för att skapa en snabbare integrationsprocess för nya utvecklare. Detta så en ny utvecklare skulle kunna lägga mer tid på att koda istället för att gräva ner sig i leverans-/testningsprocessen. Slutprodukten ger företag möjligheten att koda direkt på sitt utvecklingskluster.

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  • 314.
    Andell, Oscar
    Linköping University, Department of Computer and Information Science.
    Architectural Implications of Serverless and Function-as-a-Service2020Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Serverless or Function-as-a-Service (FaaS) is a recent architectural style that is based on the principles of abstracting infrastructure management and scaling to zero, meaning application instances are dynamically started and shut down to accommodate load. This concept of no idling servers and inherent autoscaling comes with benefits but also drawbacks.

    This study presents an evaluation of the performance and implications of the serverless architecture and contrasts it with the so-called monolith architectures. Three distinct architectures are implemented and deployed on the FaaS platform Microsoft Azure Functions as well as the PaaS platform Azure Web App. Results were produced through experiments measuring cold starts, response times, and scaling for the tested architectures as well as observations of traits such as cost and vendor lock-in. The results indicate that serverless architectures, while it is subjected to drawbacks such as vendor lock-in and cold starts, provides several benefits to a system such as reliability and cost reduction.

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  • 315.
    Andell, Oscar
    et al.
    Linköping University, Department of Computer and Information Science.
    Andersson, Albin
    Linköping University, Department of Computer and Information Science.
    Slow rate denial of service attacks on dedicated- versus cloud based server solutions2018Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Denial of Service (DoS) attacks remain a serious threat to internet stability. A specific kind of low bandwidth DoS attack, called a slow rate attack can with very limited resources potentially cause major interruptions to the availability of the attacked web servers. This thesis examines the impact of slow rate application layer DoS attacks against three different server solutions. The server solutions are a static cloud solution and a load-balancing cloud solution running on AmazonWeb Services (AWS) as well as a dedicated server. To identify the impact in terms of responsiveness and service availability a number of experiments were conducted on the web servers using publicly available DoS tools. The response times of the requests were measured. The results show that the dedicated and static cloud based server solutions are severely impacted by the attacks while the AWS load-balancing cloud solution is not impacted nearly as much. We concluded that all solutions were impacted by the attacks and that the readily available DoS tools are sufficient for creating a denial of service state on certain web servers.

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  • 316.
    Anderberg, Caroline
    Linköping University, Department of Computer and Information Science.
    Text complexity visualisations: An exploratory study on teachers interpretations of radar chart visualisations of text complexity2022Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Finding the appropriate level of text for students with varying reading abilities is an important and demanding task for teachers. Radar chart visualisations of text complexity could potentially be an aid in that process, but they need to be evaluated to see if they are intuitive and if they say something about the complexity of a text. This study explores how visualisations of text complexity, in the format of radar charts, are interpreted, what measures they should include and what information they should contain in order to be intelligible for teachers who work with people who have language and/or reading diffi- culties. A preliminary study and three focus group sessions were conducted with teachers from special education schools for adults and gymnasium level. Through thematic analysis of the sessions, five themes were generated and it was found that the visualisations are intelligible to some extent, but they need to be adapted to the target group by making sure the measures are relevant, and that the scale, colours, categories and measures are clearly explained.

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  • 317.
    Anderberg, Pierre
    Linköping University, Department of Computer and Information Science.
    Analyzing and Re-designing Legacy Systems for Enhanced Usability: A Case Study on the CATS TCT2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The CATS TCT is a military wargaming simulator used by the Swedish Armed Forces for education of position holders within battalion or company staffs. The CATS TCT was developed during the nineties and one of the challenges today is how the system can be modernized in order to meet the increased demands on usability. This master thesis is part of the work with modernizing the CATS TCT and a usability study has been conducted in order to identify issues and problems of the current system related to usability.

    This thesis is conducted at BAE Systems C-ITS in Linköping and the main focus of this study has been how to analyze and re-design the CATS TCT in order to enhance the usability of the system. Empirical data in this study has been collected through six semi-structured interviews, one observation and two focus group interviews and the result of this study has elicit several problem areas related to any of following usability aspects: effectiveness, efficiency or satisfaction.

    The conclusions from this investigation is that the CATS TCT simulator is an valuable and appreciated educational tool – especially from an effectiveness point of view. When it comes to efficiency, however, several problems areas has been identified and these areas are: information architecture, interface interaction, how orders are issued to units and how the simulation rules are implemented. When it comes to the users satisfaction of the system no unequivocal conclusion has been possible to present.

    As a complement to the identified issues and problems of the simulator this study has also presented examples on how prototypes could be used to solve some of the identified problems. More specifically, in this report re-design solutions related to how the users interact with the map, how orders are issued and how status overview is displayed has been presented.

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  • 318.
    Anderljung, Andreas
    Linköping University, Department of Computer and Information Science.
    An approach for using personas and scenarios to procure user-requirements within a procuring organization2009Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The aim of this master thesis is to investigate how a procuring organization can use personas and scenarios to gather user-requirements in the procurement of software. To reach this understanding a case study is carried out to answer the questions of research; which is a definition that suits IKEA Components, which tools and how to use them; and what are the obstacles and enablers for working with personas and scenarios in procurement of software. The thesis consists of a theoretical study in the usability area followed by an empirical investigation with semi-structured interviews and observations. The study resulted in 4 personas and 8 connected scenarios that are based on user requirements. The first finding due to the question of research includes a usability definition applied to a real context. The second reveals examples of how personas and scenarios can make the development team understand the user requirements and thus contribute to procurement. The last finding is that the main obstacles and enablers for IKEA Components is the complexity of the main system, lack of resources and the management support.

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  • 319.
    Anders, Erik
    Linköping University, Department of Computer and Information Science, The Division of Statistics and Machine Learning.
    Classification of Corporate Social Performance2021Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Over the past few years there has been an exponentially increasing attention in financetowards socially responsible investments which creates a need to determine whether acompany is socially responsible or not. The ESG ratings often used to do this are based onEnvironmental, Social and Governance related data about the companies and have manyflaws. This thesis proposes to instead model them by their controversies discussed in themedia. It tries to answer the question if it is possible to predict future controversies of acompany by its controversies and ESG indicators in the past and to isolate predictors whichinfluence these. This has not been done before and offers a new way of rating companieswithout falling for the biases of conventional ESG ratings. The chosen method to approachthis issue is the Zero Inflated Poisson Regression with Random Intercepts. A selectionof variables was determined by Lasso and projection predictive variable selection. Thismethod discovered new connections in the data between ESG indicators and the numberof controversies but also made it apparent that it is difficult to make predictions for futureyears. Nether the less the coefficients of the selected indicators can give a valuable insightinto the potential risk of an investment.

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  • 320.
    Anders, Söderholm
    et al.
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Justus, Sörman
    Linköping University, Department of Computer and Information Science, Software and Systems.
    GPU-accelleration of image rendering and sorting algorithms with the OpenCL framework2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today's computer systems often contains several different processing units aside from the CPU. Among these the GPU is a very common processing unit with an immense compute power that is available in almost all computer systems. How do we make use of this processing power that lies within our machines? One answer is the OpenCL framework that is designed for just this, to open up the possibilities of using all the different types of processing units in a computer system. This thesis will discuss the advantages and disadvantages of using the integrated GPU available in a basic workstation computer for computation of image processing and sorting algorithms. These tasks are computationally intensive and the authors will analyze if an integrated GPU is up to the task of accelerating the processing of these algorithms. The OpenCL framework makes it possible to run one implementation on different processing units, to provide perspective we will benchmark our implementations on both the GPU and the CPU and compare the results. A heterogeneous approach that combines the two above mentioned processing units will also be tested and discussed. The OpenCL framework is analyzed from a development perspective and what advantages and disadvantages it brings to the development process will be presented.

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  • 321.
    Andersdotter, Regina
    Linköping University, Department of Computer and Information Science.
    Analysis, Implementation and Evaluation of Direction Finding Algorithms using GPU Computing2022Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Direction Finding (DF) algorithms are used by the Swedish Defence Research Agency (FOI) in the context of electronic warfare against radio. Parallelizing these algorithms using a Graphics Processing Unit (GPU) might improve performance, and thereby increase military support capabilities. This thesis selects the DF algorithms Correlative Interferometer (CORR), Multiple Signal Classification (MUSIC) and Weighted Subspace Fitting (WSF), and examines to what extent GPU implementation of these algorithms is suitable, by analysing, implementing and evaluating. Firstly, six general criteria for GPU suitability are formulated. Then the three algorithms are analyzed with regard to these criteria, giving that MUSIC and WSF are both 58% suitable, closely followed by CORR on 50% suitability. MUSIC is selected for implementation, and an open source implementation is extended to three versions: a multicore CPU version, a GPU version (with Eigenvalue Decomposition (EVD) and pseudo spectrum calculation performed on the GPU), and a MIXED version (with only pseudo spectrum calculation on the GPU). These versions are then evaluated for angle resolutions between 1° and 0.025°, and CUDA block sizes between 8 and 1024. It is found that the GPU version is faster than the CPU version for angle resolutions above 0.1°, and the largest measured speedup is 1.4 times. The block size has no large impact on the total runtime. In conclusion, the overall results indicate that it is not entirely suitable, yet somewhat beneficial for large angle resolutions, to implement MUSIC using GPU computing.

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  • 322.
    Anderskär, Erika
    et al.
    Linköping University, Department of Computer and Information Science, The Division of Statistics and Machine Learning.
    Thomasson, Frida
    Linköping University, Department of Computer and Information Science, The Division of Statistics and Machine Learning.
    Inkrementell responsanalys av Scandnavian Airlines medlemmar: Vilka kunder ska väljas vid riktad marknadsföring?2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Scandinavian Airlines has a large database containing their Eurobonus members. In order to analyze which customers they should target with direct marketing, such as emails, uplift models have been used. With a binary response variable that indicates whether the customer has bought or not, and a binary dummy variable that indicates if the customer has received the campaign or not conclusions can be drawn about which customers are persuadable. That means that the customers that buy when they receive a campaign and not if they don't are spotted. Analysis have been done with one campaign for Sweden and Scandinavia. The methods that have been used are logistic regression with Lasso and logistic regression with Penalized Net Information Value. The best method for predicting purchases is Lasso regression when comparing with a confusion matrix. The variable that best describes persuadable customers in logistic regression with PNIV is Flown (customers that have own with SAS within the last six months). In Lassoregression the variable that describes a persuadable customer in Sweden is membership level1 (the rst level of membership) and in Scandinavia customers that receive campaigns with delivery code 13 are persuadable, which is a form of dispatch.

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  • 323.
    Anderson, Elise
    et al.
    Linköping University, Department of Computer and Information Science.
    Strömsrud, Isabelle
    Linköping University, Department of Computer and Information Science.
    Användbarhet av chatbotar i medelstora företag2020Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Combitech is aiming to develop their own intraweb and they are investigating if it ispossible to implement a bot that handles menial task to make daily tasks easier on their

    employees. This thesis investigates whether a chatbot which handles the booking of me-etings will be useful to the company. After implementing the chatbot and testing it with

    5 employees the conclusion was made that a chatbot for meetings was not very useful.However, the testers were very positive about having a chatbot on the intraweb if it isimplemented for tasks which are timely or complicated to solve.

  • 324.
    Anderson, Jonathan
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Visualisation of data from IoT systems: A case study of a prototyping tool for data visualisations2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The client in this study, Attentec, has seen an increase in the demand for services connected to Internet of things systems. This study is therefore examining if there is a tool that can be a used to build fast prototype visualisations of data from IoT systems to use as a tool in their daily work.

    The study started with an initial phase with two parts. The first part was to get better knowledge of Attentec and derive requirements for the tool and the second part was a comparison of prototyping tools for aiding in development of data visualisations. Apache Zeppelin was chosen as the most versatile and suitable tool matching the criteria defined together with Attentec. Following the initial phase a pre-study containing interviews to collect empirical data on how visualisations and IoT projects had been implemented previously at Attentec were performed. This lead to the conclusion that geospatial data and NoSQL databases were common for IoT projects. A technical investigation was conducted on Apache Zeppelin to answer if there were any limits in using the tool for characteristics common in IoT system. This investigation lead to the conclusion that there was no support for plotting data on a map.

    The first implementation phase implemented support for geospatial data by adding a visualisation plug-in that plotted data on a map. The implementation phase was followed by an evaluation phase in which 5 participants performed tasks with Apache Zeppelin to evaluate the perceived usability of the tool. The evaluation was performed using a System Usability Scale and a Summed Usability Metric as well as interviews with the participants to find where improvements could be made. From the evaluation three main problems were discovered, the import and mapping of data, more feature on the map visualisation plug-in and the creation of database queries. The first two were chosen for the second iteration where a script for generating the code to import data was developed as well as improvements to the geospatial visualisation plug-in. A second evaluation was performed after the changes were made using similar tasks as in the first to see if the usability was improved between the two evaluations. The results of the Summed Usability Metric improved on all tasks and the System Usability Scale showed no significant change. In the interviews with the participants they all responded that the perceived usability had improved between the two evaluations suggesting some improvement.

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  • 325.
    Anderson, Jonathan
    et al.
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Björch, Tobias
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Boman, Jakob
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    van Dijk, Christopher
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Harrius, Sofie
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Nilsson, Daniel
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Ottosson, Albin
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Östman, Johan
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    BookShark – En praktisk studie i webbutveckling2014Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [sv]

    Rapportens syfte är att beskriva det tekniska och teoretiska framtagandet av e-boktjänsten BookShark. Den innehåller bland annat styrkanden rörande tjänstens hållbarhet på marknaden samt hur teamet har förhållit sig till arbetsmetoden Scrum. Målgruppen för BookShark är kunder som vill ha möjligheten att handla böcker online på ett smidigt sätt till ett förmånligt pris. Utifrån detta har teamet arbetat enligt visionen Vår vision är att revolutionera sättet människor konsumerar böcker på genom att göra böcker billigare och mer lättillgängliga för alla.

    Den tekniska utvecklingen har delats upp i fyra lager: Databas, Databasinterface, Serverskript och Front-end. Teammedlemmarna har delat upp ansvarområden inom dessa fyra lager, men samtidigt haft en kontinuerlig uppdatering om varandras arbete för att på så sätt ha koll på respektive teammedlems arbete.

    BookShark har uppnått den kravspecifikation som sattes av teamet i projektets början, och även om viss utveckling fortfarande skulle krävas för en kommersiell lansering har önskad funktionalitet uppnåtts.

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  • 326. Andersson, A
    et al.
    Vimarlund, Vivian
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, MDALAB - Human Computer Interfaces.
    Timpka, Toomas
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Health Sciences, Division of Preventive and Social Medicine and Public Health Science. Östergötlands Läns Landsting, FHVC - Folkhälsovetenskapligt centrum.
    Management perspective on Information and Communication Technology - Requirement specification for process-oriented healthcare2001In: JAMIA Journal of the American Medical Informatics Association, ISSN 1067-5027, E-ISSN 1527-974X, p. 854-854Conference paper (Other academic)
  • 327.
    Andersson, Adam
    et al.
    Linköping University, Department of Computer and Information Science.
    Byrsten, Niclas
    Linköping University, Department of Computer and Information Science.
    Hvass, Björn
    Linköping University, Department of Computer and Information Science.
    Lindström, Henrik
    Linköping University, Department of Computer and Information Science.
    Persson, Martin
    Linköping University, Department of Computer and Information Science.
    Sjöbergsson, Christoffer
    Linköping University, Department of Computer and Information Science.
    Utterborn, Tor
    Linköping University, Department of Computer and Information Science.
    Schemaläggningsstöd för kirurgi2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport är resultatet av kandidatprojektkursen TDDD96 som ges vid Linköpings Universitet. Rapporten omfattas av sju studenter som har utvecklat ett schemaläggnings-stöd för kirurgin till Region Östergötland. I rapporten behandlas de tekniska val som har gjorts, hur utvecklingsarbetet har fortgått och hur resultat blev. Varje student har också bidragit med en individuell studie, dessa finns i slutet av dokumentet.

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  • 328. Order onlineBuy this publication >>
    Andersson, Anders
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering. Statens väg- och transportforskningsinstitut (VTI), Trafik och trafikant,TRAF, Fordonsteknik och simulering, FTS, Linköping, Sweden.
    Distributed Moving Base Driving Simulators: Technology, Performance, and Requirements2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Development of new functionality and smart systems for different types of vehicles is accelerating with the advent of new emerging technologies such as connected and autonomous vehicles. To ensure that these new systems and functions work as intended, flexible and credible evaluation tools are necessary. One example of this type of tool is a driving simulator, which can be used for testing new and existing vehicle concepts and driver support systems. When a driver in a driving simulator operates it in the same way as they would in actual traffic, you get a realistic evaluation of what you want to investigate. Two advantages of a driving simulator are (1.) that you can repeat the same situation several times over a short period of time, and (2.) you can study driver reactions during dangerous situations that could result in serious injuries if they occurred in the real world. An important component of a driving simulator is the vehicle model, i.e., the model that describes how the vehicle reacts to its surroundings and driver inputs. To increase the simulator realism or the computational performance, it is possible to divide the vehicle model into subsystems that run on different computers that are connected in a network. A subsystem can also be replaced with hardware using so-called hardware-in-the-loop simulation, and can then be connected to the rest of the vehicle model using a specified interface. The technique of dividing a model into smaller subsystems running on separate nodes that communicate through a network is called distributed simulation.

    This thesis investigates if and how a distributed simulator design might facilitate the maintenance and new development required for a driving simulator to be able to keep up with the increasing pace of vehicle development. For this purpose, three different distributed simulator solutions have been designed, built, and analyzed with the aim of constructing distributed simulators, including external hardware, where the simulation achieves the same degree of realism as with a traditional driving simulator. One of these simulator solutions has been used to create a parameterized powertrain model that can be configured to represent any of a number of different vehicles. Furthermore, the driver's driving task is combined with the powertrain model to monitor deviations. After the powertrain model was created, subsystems from a simulator solution and the powertrain model have been transferred to a Modelica environment. The goal is to create a framework for requirement testing that guarantees sufficient realism, also for a distributed driving simulation.

    The results show that the distributed simulators we have developed work well overall with satisfactory performance. It is important to manage the vehicle model and how it is connected to a distributed system. In the distributed driveline simulator setup, the network delays were so small that they could be ignored, i.e., they did not affect the driving experience. However, if one gradually increases the delays, a driver in the distributed simulator will change his/her behavior. The impact of communication latency on a distributed simulator also depends on the simulator application, where different usages of the simulator, i.e., different simulator studies, will have different demands. We believe that many simulator studies could be performed using a distributed setup. One issue is how modifications to the system affect the vehicle model and the desired behavior. This leads to the need for methodology for managing model requirements. In order to detect model deviations in the simulator environment, a monitoring aid has been implemented to help notify test managers when a model behaves strangely or is driven outside of its validated region. Since the availability of distributed laboratory equipment can be limited, the possibility of using Modelica (which is an equation-based and object-oriented programming language) for simulating subsystems is also examined. Implementation of the model in Modelica has also been extended with requirements management, and in this work a framework is proposed for automatically evaluating the model in a tool.

    List of papers
    1. Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    Open this publication in new window or tab >>Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    2013 (English)In: SAE International Journal of Passenger Cars - Electronic and Electrical Systems, ISSN 1946-4614, E-ISSN 1946-4622, Vol. 6, no 1, p. 169-179Article in journal (Refereed) Published
    Abstract [en]

    To evaluate driver perception of a vehicle powertrain a moving base simulator is a well-established technique. We are connecting the moving base simulator Sim III, at the Swedish National Road and Transport Research Institute with a newly built chassis dynamometer at Vehicular Systems, Linköping University. The purpose of the effort is to enhance fidelity of moving base simulators by letting drivers experience an actual powertrain. At the same time technicians are given a new tool for evaluating powertrain solutions in a controlled environment. As a first step the vehicle model from the chassis dynamometer system has been implemented in Sim III. Interfacing software was developed and an optical fiber covering the physical distance of 500 m between the facilities is used to connect the systems. Further, a pedal robot has been developed that uses two linear actuators pressing the accelerator and brake pedals. The pedal robot uses feedback loops on accelerator position or brake cylinder pressure and is controlled via an UDP interface. Results from running the complete setup showed expected functionality and we are successful in performing a driving mission based on real road topography data. Vehicle acceleration and general driving feel was perceived as realistic by the test subjects while braking still needs improvements. The pedal robot construction enables use of a large set of cars available on the market and except for mounting the brake pressure sensor the time to switch vehicle is approximately 30 minutes.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-92215 (URN)10.4271/2013-01-0410 (DOI)
    Available from: 2013-05-08 Created: 2013-05-08 Last updated: 2019-04-28Bibliographically approved
    2. A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Open this publication in new window or tab >>A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Show others...
    2015 (English)In: Proceedings of the DSC 2015 Europe: Driving Simulation Conference & Exhibition / [ed] Heinrich Bülthoff, Andras Kemeny and Paolo Pretto, 2015, p. 123-130Conference paper, Published paper (Refereed)
    Abstract [en]

    Modern vehicles are complex systems consisting of an increasing large multitude of components that operate together. While functional verification on individual components is important, it is also important to test components within a driving environment, both from a functional perspective and from a driver perspective. One proven way for testing is vehicle simulators and in this work the main goals have been to increase flexibility and scalability by introducing a distributed driving simulator platform.

    As an example, consider a workflow where a developer can go from a desktop simulation to an intermediate driving simulator to a high fidelity driving simulator with Hardware-In-the-Loop systems close to a finished vehicle in an easy way. To accomplish this, a distributed simulation architecture was designed and implemented that divides a driving simulator environment into four major entities with well-defined interfaces, using HLA as the method of communication. This platform was evaluated on two aspects, flexibility/scalability and timing performance. Results show that increased flexibility and scalability was achieved when using a distributed simulation platform. It is also shown that latency was only slightly increased when using HLA.

    Keywords
    Test, Vehicle, Engine, Performance, Simulator (driving), Computer
    National Category
    Computer Systems
    Research subject
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 90 Road: Vehicles and vehicle technology, 96 Road: Vehicle operating and management
    Identifiers
    urn:nbn:se:liu:diva-136153 (URN)9783981309935 (ISBN)
    Conference
    Driving Simulation Conference 2015. 16-18 september 2015, Tübingen, Germany
    Available from: 2016-01-11 Created: 2017-03-31 Last updated: 2019-04-28Bibliographically approved
    3. Testing cooperative intelligent transport systems in distributed simulators
    Open this publication in new window or tab >>Testing cooperative intelligent transport systems in distributed simulators
    Show others...
    2019 (English)In: Transportation Research Part F: Traffic Psychology and Behaviour, ISSN 1369-8478, E-ISSN 1873-5517, Vol. 65, p. 206-216Article in journal (Refereed) Published
    Abstract [en]

    Simulation is often used as a technique to test and evaluate systems, as it provides a cost-efficient and safe alternative for testing and evaluation. A combination of simulators can be used to create high-fidelity and realistic test scenarios, especially when the systems-under-test are complex. An example of such complex systems is Cooperative Intelligent Transport Systems (C-ITS), which include many actors that are connected to each other via wireless communication in order to interact and cooperate. The majority of the actors in the systems are vehicles equipped with wireless communication modules, which can range from fully autonomous vehicles to manually driven vehicles. In order to test and evaluate C-ITS, this paper presents a distributed simulation framework that consists of (a) a moving base driving simulator; (b) a real-time vehicle simulator; and (c) network and traffic simulators. We present our approach for connecting and co-simulating the simulators. We report on limitation and performance that this simulation framework can achieve. Lastly, we discuss potential benefits and feasibility of using the simulation framework for testing of C-ITS.

    Place, publisher, year, edition, pages
    Elsevier, 2019
    Keywords
    Cooperative intelligent transportation systems, Hardware-in-the-loop, Network simulator, Traffic simulator, Moving base driving simulator
    National Category
    Vehicle Engineering Computer Systems
    Identifiers
    urn:nbn:se:liu:diva-159824 (URN)10.1016/j.trf.2019.07.020 (DOI)
    Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-08-22Bibliographically approved
    4. Parameterization procedure of a powertrain model for a driving simulator
    Open this publication in new window or tab >>Parameterization procedure of a powertrain model for a driving simulator
    2016 (English)In: Advances in Transportation Studies, ISSN 1824-5463, Vol. 1, p. 99-112Article in journal (Refereed) Published
    Abstract [en]

    The automotive industry is facing a major challenge to reduce environmental impacts. As a consequence, the increasing diversity of powertrain configurations put a demand on testing and evaluation procedures. One of the key tools for this purpose is simulators. In this paper a powertrain model and a procedure for parameterizing it, using chassis dynamometers and a developed pedal robot are presented. The parameterizing procedure uses the on-board diagnostics of the car and does not require any additional invasive sensors.

    Thus, the developed powertrain model and parameterization procedure provide a rapid non- invasive way of modelling powertrains of test cars. The parameterizing procedure has been used to model a front wheel drive Golf V with a 1.4L multi-fuel engine and a manual gearbox. The achieved results show a good match between simulation results and test data. The powertrain model has also been tested in real-time in a driving simulator.

    Place, publisher, year, edition, pages
    Aracne editrice, 2016
    Keywords
    Motor, Test, Characteristics, Simulation
    National Category
    Vehicle Engineering
    Research subject
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
    Identifiers
    urn:nbn:se:liu:diva-156538 (URN)10.4399/978885489179109 (DOI)2-s2.0-84982994768 (Scopus ID)
    Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-05-03Bibliographically approved
    5. Vehicle model quality framework for moving base driving simulators, a powertrain model example
    Open this publication in new window or tab >>Vehicle model quality framework for moving base driving simulators, a powertrain model example
    2018 (English)In: International Journal of Vehicle Systems Modelling and Testing, ISSN 1745-6436, E-ISSN 1745-6444, Vol. 13, no 2, p. 93-108Article in journal (Refereed) Published
    Abstract [en]

    Moving base driving simulators, with an enclosed human driver, are often used to study driver-vehicle interaction or driver behaviour. Reliable results from such a driving simulator study strongly depend on the perceived realism by the driver in the performed driving task. Assuring sufficient fidelity for a vehicle dynamics model during a driving task is currently to a large degree a manual task. Focus here is to automate this process by employing a framework using collected driving data for detection of model quality for different driving tasks. Using this framework, a powertrain model credibility is predicted and assessed. Results show that chosen powertrain model is accurate enough for a driving scenario on rural roads/motorway, but need improvements for city driving. This was expected, considering the complexity of the vehicle dynamics model, and it was accurately captured by the proposed framework which includes real-time information to the simulator operator.

    Place, publisher, year, edition, pages
    InderScience Publishers, 2018
    Keywords
    vehicle dynamics model, driving simulator, driving task, quality framework, domain of validity, domain of operation, powertrain model
    National Category
    Computer Systems Vehicle Engineering
    Identifiers
    urn:nbn:se:liu:diva-156544 (URN)10.1504/IJVSMT.2018.098330 (DOI)2-s2.0-85063100727 (Scopus ID)
    Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-05-03Bibliographically approved
    6. Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    Open this publication in new window or tab >>Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    2013 (English)In: Proceedings of the 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools; April 19, University of Nottingham, Nottingham, UK / [ed] Henrik Nilsson, Linköping: Linköping University Electronic Press, 2013, Vol. 84, p. 131-139Conference paper, Published paper (Refereed)
    Abstract [en]

    A car model in Modelica has been developed to be used in a new setup for distributed real-time simulation where a moving base car simulator is connected with a real car in a chassis dynamometer via a 500m fiber optic communication link. The new co-simulator set-up can be used in a number of configurations where hardware in the loop can be interchanged with software in the loop. The models presented in this paper are the basic blocks chosen for modeling the system in the context of a distributed real-time simulation; estimating parameters for the powertrain model; the choice of numeric solver; and the interaction with the solver for real-time properties.

    Place, publisher, year, edition, pages
    Linköping: Linköping University Electronic Press, 2013
    Series
    Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 84
    Keywords
    Modelica; real-time; distributed; communications link
    National Category
    Computer Systems
    Identifiers
    urn:nbn:se:liu:diva-118994 (URN)978-91-7519-621-3 (ISBN)978-91-7519-617-6 (ISBN)
    Conference
    The 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools, April 19, University of Nottingham, Nottingham; UK
    Available from: 2015-06-05 Created: 2015-06-05 Last updated: 2019-04-28Bibliographically approved
    7. Powertrain Model Assessment for Different Driving Tasks through Requirement Verification
    Open this publication in new window or tab >>Powertrain Model Assessment for Different Driving Tasks through Requirement Verification
    2018 (English)In: The 9th EUROSIM Congress on Modelica and Simulation, 2018, p. 721-727Conference paper, Published paper (Refereed)
    Abstract [en]

    For assessing whether a system model is a good candidate for a particular simulation scenario or choosing the best system model between multiple design alternatives it is important to be able to evaluate the suitability of the system model. In this paper we present a methodology based on finite state machine requirements verifying system behaviour in a Modelica environment where the intended system model usage is within a moving base driving simulator. A use case illustrate the methodology with a Modelica powertrain system model using replaceable components and measured data from a Golf V. The achieved results show the importance of context of requirements and how users are assisted in finding system model issues. 

    Series
    Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 142
    Keywords
    system model assessment, requirement modelling, Modelica, finite state machine, powertrain validations
    National Category
    Computer Systems
    Identifiers
    urn:nbn:se:liu:diva-156540 (URN)10.3384/ecp17142721 (DOI)978-91-7685-399-3 (ISBN)
    Conference
    EUROSIM 2016
    Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-05-13
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    Distributed Moving Base Driving Simulators: Technology, Performance, and Requirements
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  • 329. Order onlineBuy this publication >>
    Andersson, Anders
    Linköping University, Department of Computer and Information Science. Linköping University, Faculty of Science & Engineering. Swedish National Road and Transport Research Institute (VTI), Linköping, Sweden.
    Extensions for Distributed Moving Base Driving Simulators2017Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Modern vehicles are complex systems. Different design stages for such a complex system include evaluation using models and submodels, hardware-in-the-loop systems and complete vehicles. Once a vehicle is delivered to the market evaluation continues by the public. One kind of tool that can be used during many stages of a vehicle lifecycle is driving simulators.

    The use of driving simulators with a human driver is commonly focused on driver behavior. In a high fidelity moving base driving simulator it is possible to provide realistic and repetitive driving situations using distinctive features such as: physical modelling of driven vehicle, a moving base, a physical cabin interface and an audio and visual representation of the driving environment. A desired but difficult goal to achieve using a moving base driving simulator is to have behavioral validity. In other words, \A driver in a moving base driving simulator should have the same driving behavior as he or she would have during the same driving task in a real vehicle.".

    In this thesis the focus is on high fidelity moving base driving simulators. The main target is to improve the behavior validity or to maintain behavior validity while adding complexity to the simulator. One main assumption in this thesis is that systems closer to the final product provide better accuracy and are perceived better if properly integrated. Thus, the approach in this thesis is to try to ease incorporation of such systems using combinations of the methods hardware-in-the-loop and distributed simulation. Hardware-in-the-loop is a method where hardware is interfaced into a software controlled environment/simulation. Distributed simulation is a method where parts of a simulation at physically different locations are connected together. For some simulator laboratories distributed simulation is the only feasible option since some hardware cannot be moved in an easy way.

    Results presented in this thesis show that a complete vehicle or hardware-in-the-loop test laboratory can successfully be connected to a moving base driving simulator. Further, it is demonstrated that using a framework for distributed simulation eases communication and integration due to standardized interfaces. One identified potential problem is complexity in interface wrappers when integrating hardware-in-the-loop in a distributed simulation framework. From this aspect, it is important to consider the model design and the intersections between software and hardware models. Another important issue discussed is the increased delay in overhead time when using a framework for distributed simulation.

    List of papers
    1. Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    Open this publication in new window or tab >>Vehicle Powertrain Test Bench Co-Simulation with a Moving Base Simulator Using a Pedal Robot
    2013 (English)In: SAE International Journal of Passenger Cars - Electronic and Electrical Systems, ISSN 1946-4614, E-ISSN 1946-4622, Vol. 6, no 1, p. 169-179Article in journal (Refereed) Published
    Abstract [en]

    To evaluate driver perception of a vehicle powertrain a moving base simulator is a well-established technique. We are connecting the moving base simulator Sim III, at the Swedish National Road and Transport Research Institute with a newly built chassis dynamometer at Vehicular Systems, Linköping University. The purpose of the effort is to enhance fidelity of moving base simulators by letting drivers experience an actual powertrain. At the same time technicians are given a new tool for evaluating powertrain solutions in a controlled environment. As a first step the vehicle model from the chassis dynamometer system has been implemented in Sim III. Interfacing software was developed and an optical fiber covering the physical distance of 500 m between the facilities is used to connect the systems. Further, a pedal robot has been developed that uses two linear actuators pressing the accelerator and brake pedals. The pedal robot uses feedback loops on accelerator position or brake cylinder pressure and is controlled via an UDP interface. Results from running the complete setup showed expected functionality and we are successful in performing a driving mission based on real road topography data. Vehicle acceleration and general driving feel was perceived as realistic by the test subjects while braking still needs improvements. The pedal robot construction enables use of a large set of cars available on the market and except for mounting the brake pressure sensor the time to switch vehicle is approximately 30 minutes.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-92215 (URN)10.4271/2013-01-0410 (DOI)
    Available from: 2013-05-08 Created: 2013-05-08 Last updated: 2019-04-28Bibliographically approved
    2. Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    Open this publication in new window or tab >>Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
    2013 (English)In: Proceedings of the 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools; April 19, University of Nottingham, Nottingham, UK / [ed] Henrik Nilsson, Linköping: Linköping University Electronic Press, 2013, Vol. 84, p. 131-139Conference paper, Published paper (Refereed)
    Abstract [en]

    A car model in Modelica has been developed to be used in a new setup for distributed real-time simulation where a moving base car simulator is connected with a real car in a chassis dynamometer via a 500m fiber optic communication link. The new co-simulator set-up can be used in a number of configurations where hardware in the loop can be interchanged with software in the loop. The models presented in this paper are the basic blocks chosen for modeling the system in the context of a distributed real-time simulation; estimating parameters for the powertrain model; the choice of numeric solver; and the interaction with the solver for real-time properties.

    Place, publisher, year, edition, pages
    Linköping: Linköping University Electronic Press, 2013
    Series
    Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 84
    Keywords
    Modelica; real-time; distributed; communications link
    National Category
    Computer Systems
    Identifiers
    urn:nbn:se:liu:diva-118994 (URN)978-91-7519-621-3 (ISBN)978-91-7519-617-6 (ISBN)
    Conference
    The 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools, April 19, University of Nottingham, Nottingham; UK
    Available from: 2015-06-05 Created: 2015-06-05 Last updated: 2019-04-28Bibliographically approved
    3. A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Open this publication in new window or tab >>A Driving Simulation Platform using Distributed Vehicle Simulators and HLA
    Show others...
    2015 (English)In: Proceedings of the DSC 2015 Europe: Driving Simulation Conference & Exhibition / [ed] Heinrich Bülthoff, Andras Kemeny and Paolo Pretto, 2015, p. 123-130Conference paper, Published paper (Refereed)
    Abstract [en]

    Modern vehicles are complex systems consisting of an increasing large multitude of components that operate together. While functional verification on individual components is important, it is also important to test components within a driving environment, both from a functional perspective and from a driver perspective. One proven way for testing is vehicle simulators and in this work the main goals have been to increase flexibility and scalability by introducing a distributed driving simulator platform.

    As an example, consider a workflow where a developer can go from a desktop simulation to an intermediate driving simulator to a high fidelity driving simulator with Hardware-In-the-Loop systems close to a finished vehicle in an easy way. To accomplish this, a distributed simulation architecture was designed and implemented that divides a driving simulator environment into four major entities with well-defined interfaces, using HLA as the method of communication. This platform was evaluated on two aspects, flexibility/scalability and timing performance. Results show that increased flexibility and scalability was achieved when using a distributed simulation platform. It is also shown that latency was only slightly increased when using HLA.

    Keywords
    Test, Vehicle, Engine, Performance, Simulator (driving), Computer
    National Category
    Computer Systems
    Research subject
    90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 90 Road: Vehicles and vehicle technology, 96 Road: Vehicle operating and management
    Identifiers
    urn:nbn:se:liu:diva-136153 (URN)9783981309935 (ISBN)
    Conference
    Driving Simulation Conference 2015. 16-18 september 2015, Tübingen, Germany
    Available from: 2016-01-11 Created: 2017-03-31 Last updated: 2019-04-28Bibliographically approved
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    Extensions for Distributed Moving Base Driving Simulators
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  • 330.
    Andersson, Anders
    et al.
    Swedish National Road and Transport Research Institute, Sweden.
    Buffoni, Lena
    Linköping University, Department of Computer and Information Science, Software and Systems. Linköping University, Faculty of Science & Engineering.
    Powertrain Model Assessment for Different Driving Tasks through Requirement Verification2018In: The 9th EUROSIM Congress on Modelica and Simulation, 2018, p. 721-727Conference paper (Refereed)
    Abstract [en]

    For assessing whether a system model is a good candidate for a particular simulation scenario or choosing the best system model between multiple design alternatives it is important to be able to evaluate the suitability of the system model. In this paper we present a methodology based on finite state machine requirements verifying system behaviour in a Modelica environment where the intended system model usage is within a moving base driving simulator. A use case illustrate the methodology with a Modelica powertrain system model using replaceable components and measured data from a Golf V. The achieved results show the importance of context of requirements and how users are assisted in finding system model issues. 

  • 331.
    Andersson, Anders
    et al.
    Linköping University, Department of Computer and Information Science, Software and Systems. Linköping University, Faculty of Science & Engineering. Swedish National Road and Transportation Research Institute.
    Fritzson, Peter
    Linköping University, Department of Computer and Information Science, Software and Systems. Linköping University, Faculty of Science & Engineering.
    Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup2013In: Proceedings of the 5th International Workshop on Equation-Based Object-Oriented Modeling Languages and Tools; April 19, University of Nottingham, Nottingham, UK / [ed] Henrik Nilsson, Linköping: Linköping University Electronic Press, 2013, Vol. 84, p. 131-139Conference paper (Refereed)
    Abstract [en]

    A car model in Modelica has been developed to be used in a new setup for distributed real-time simulation where a moving base car simulator is connected with a real car in a chassis dynamometer via a 500m fiber optic communication link. The new co-simulator set-up can be used in a number of configurations where hardware in the loop can be interchanged with software in the loop. The models presented in this paper are the basic blocks chosen for modeling the system in the context of a distributed real-time simulation; estimating parameters for the powertrain model; the choice of numeric solver; and the interaction with the solver for real-time properties.

    Download full text (pdf)
    Models for Distributed Real-Time Simulation in a Vehicle Co-Simulator Setup
  • 332.
    Andersson, André
    Linköping University, Department of Computer and Information Science, Human-Centered systems.
    Selenium-Testing as a Service2016Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Selenium has been a method to test web applications for over a decade, it is interacting directly with the browser and has gained support from both browsers and the community. With the growing amount of browsers, mobile devices and operating systems which a web application is expected to work with, services providing these systems for testing web applications against has gained interest. These services provide testing as a service (TaaS), and runs Selenium-tests in the cloud. This research tried to compare the different services with each other in regard to flexibility, cost, simplicity and reliability. I have also tried to see differences between running the tests locally and using these services. The results showed that there are some differences between the services, and the one best suited might depend on the web application.

    Download full text (pdf)
    selenium-testing_as_a_service.pdf
  • 333.
    Andersson, Anna
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Management information systems in process-oriented healthcare organisations2003Licentiate thesis, comprehensive summary (Other scientific)
    Abstract [en]

    The aim of this thesis work was to develop a management information system model for process-oriented healthcare organisations. The study explores two questions: “What kinds of requirements do healthcare managers place on information systems?” and “How can the work and information systems of healthcare managers and care providers be incorporated into process-oriented healthcare organisations?”

    The background to the study was the process orientation of Swedish healthcare organisations. The study was conducted at the paediatric clinic of a county hospital in southern Sweden. Organisational process was defined as “a sequence of work procedures that jointly constitute complete healthcare services”, while a functional unit was the organisational venue responsible for a certain set of work activities.

    A qualitative research method, based on a developmental circle, was used. The data was collected from archives, interviews, observations, diaries and focus groups. The material was subsequently analysed in order to categorise, model and develop small-scale theories about information systems.

    The study suggested that computer-based management information systems in processoriented healthcare organisations should: (1) support medical work; (2) integrate clinical and administrative tools; (3) facilitate the ability of the organisation to measure inputs and outcomes.

    The research effort concluded that various healthcare managers need the same type of primary data, though presented in different ways. Professional developers and researchers have paid little attention to the manner in which integrated administrative, financial and clinical systems should be configured in order to ensure optimal support for process-oriented healthcare organisations. Thus, it is important to identify the multiple roles that information plays in such an organisation.

    List of papers
    1. Management demands on information and communication technology in process- oriented health-care organizations: The importance of understanding managers expectations during early phases of systems design
    Open this publication in new window or tab >>Management demands on information and communication technology in process- oriented health-care organizations: The importance of understanding managers expectations during early phases of systems design
    2002 (English)In: Journal of Management in Medicine, ISSN 0268-9235, Vol. 16, no 2-3, p. 159-169Article in journal (Refereed) Published
    Abstract [en]

    There are numerous challenges to overcome before information and communication technology (ICT) can achieve its full potential in process-oriented health-care organizations. One of these challenges is designing systems that meet users’ needs, while reflecting a continuously changing organizational environment. Another challenge is to develop ICT that supports both the internal and the external stakeholders’ demands. In this study a qualitative research strategy was used to explore the demands on ICT expressed by managers from functional and process units at a community hospital. The results reveal a multitude of partially competing goals that can make the ICT development process confusing, poor in quality, inefficient and unnecessarily costly. Therefore, from the perspective of ICT development, the main task appears to be to coordinate the different visions and in particular clarify them, as well as to establish the impact that these visions would have on the forthcoming ICT application.

    Keywords
    Communications technology, Health care, Information technology, Management, Organizational development, Systems design
    National Category
    Medical and Health Sciences
    Identifiers
    urn:nbn:se:liu:diva-13778 (URN)10.1108/02689230210434907 (DOI)
    Available from: 2003-10-06 Created: 2003-10-06 Last updated: 2022-03-08
    2. A Model for Interpreting Work and Information Management in Process-Oriented Healthcare Organisations
    Open this publication in new window or tab >>A Model for Interpreting Work and Information Management in Process-Oriented Healthcare Organisations
    2003 (English)In: International Journal of Medical Informatics, ISSN 1386-5056, Vol. 72, no 1-3, p. 47-56Article in journal (Refereed) Published
    Abstract [en]

    Background: To increase productivity, management in healthcare organisations have introduced different types of process-oriented organisational configurations. Few studies have addressed clinical practice and information management in these settings. Methods: A case study was performed at a paediatric clinic. Data was collected from archives, through interviews, by participatory observation, and by performing a focus group session. The collected data was analysed using a qualitative and interpretative research strategy. Results: A model was developed of care practitioners’ daily work in process-oriented organisations. The model shows that clinical work was deeply integrated; the care activities were dependent on supply activities and tightly connected to management routines. Conclusion: The resulting model can be used to support development of health information system (HIS) embedded in process-oriented healthcare work.

    Keywords
    Process-oriented healthcare organisation; Health information system (HIS); Healthcare management; Care process; Case study methods
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-13779 (URN)10.1016/j.ijmedinf.2003.09.001 (DOI)
    Available from: 2003-10-06 Created: 2003-10-06 Last updated: 2013-09-05
    3. A Management Information System Model for Process-Oriented Health Care
    Open this publication in new window or tab >>A Management Information System Model for Process-Oriented Health Care
    2003 (English)In: Proceedings of Medinfo 2004, 2003Conference paper, Published paper (Refereed)
    National Category
    Medical and Health Sciences
    Identifiers
    urn:nbn:se:liu:diva-13780 (URN)
    Available from: 2003-10-06 Created: 2003-10-06 Last updated: 2013-09-05
    Download full text (pdf)
    FULLTEXT01
  • 334.
    Andersson, Anna
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, MDALAB - Human Computer Interfaces.
    Hallberg, Nicklas
    FOI.
    Eriksson, Henrik
    Linköping University, The Institute of Technology. Linköping University, Department of Computer and Information Science, MDALAB - Human Computer Interfaces.
    Timpka, Toomas
    Linköping University, Faculty of Health Sciences. Linköping University, Department of Department of Health and Society, Division of Preventive and Social Medicine and Public Health Science. Östergötlands Läns Landsting, Centre for Public Health Sciences, Centre for Public Health Sciences.
    A management information system-model for process-oriented health care2004In: Medinfo, IOS Press , 2004, p. 1008-1012Conference paper (Refereed)
  • 335.
    Andersson, Anna
    et al.
    Linköping University, Department of Computer and Information Science, MDA. Linköping University, The Institute of Technology.
    Hallberg, Niklas
    Linköping University, Department of Computer and Information Science, MDA. Linköping University, The Institute of Technology.
    Eriksson, Henrik
    Linköping University, Department of Computer and Information Science, MDA. Linköping University, The Institute of Technology.
    Timpka, Toomas
    Linköping University, Department of Medicine and Health Sciences. Linköping University, Faculty of Health Sciences.
    A Management Information System Model for Process-Oriented Health Care2003In: Proceedings of Medinfo 2004, 2003Conference paper (Refereed)
  • 336.
    Andersson, Anna
    et al.
    Linköping University, Department of Computer and Information Science, MDA. Linköping University, The Institute of Technology.
    Hallberg, Niklas
    Linköping University, Department of Computer and Information Science, MDA. Linköping University, The Institute of Technology.
    Timpka, Toomas
    Linköping University, Department of Medicine and Health Sciences. Linköping University, Faculty of Health Sciences.
    A Model for Interpreting Work and Information Management in Process-Oriented Healthcare Organisations2003In: International Journal of Medical Informatics, ISSN 1386-5056, Vol. 72, no 1-3, p. 47-56Article in journal (Refereed)
    Abstract [en]

    Background: To increase productivity, management in healthcare organisations have introduced different types of process-oriented organisational configurations. Few studies have addressed clinical practice and information management in these settings. Methods: A case study was performed at a paediatric clinic. Data was collected from archives, through interviews, by participatory observation, and by performing a focus group session. The collected data was analysed using a qualitative and interpretative research strategy. Results: A model was developed of care practitioners’ daily work in process-oriented organisations. The model shows that clinical work was deeply integrated; the care activities were dependent on supply activities and tightly connected to management routines. Conclusion: The resulting model can be used to support development of health information system (HIS) embedded in process-oriented healthcare work.

  • 337.
    Andersson, Anna
    et al.
    Linköping University, Department of Computer and Information Science, MDALAB - Human Computer Interfaces. Linköping University, The Institute of Technology.
    Vimarlund, Vivian
    Linköping University, Department of Computer and Information Science, EISLAB - Economic Information Systems. Linköping University, The Institute of Technology.
    Timpka, Tomas
    Linköping University, Department of Medicine and Health Sciences. Linköping University, Faculty of Health Sciences.
    Management demands on information and communication technology in process- oriented health-care organizations: The importance of understanding managers expectations during early phases of systems design2002In: Journal of Management in Medicine, ISSN 0268-9235, Vol. 16, no 2-3, p. 159-169Article in journal (Refereed)
    Abstract [en]

    There are numerous challenges to overcome before information and communication technology (ICT) can achieve its full potential in process-oriented health-care organizations. One of these challenges is designing systems that meet users’ needs, while reflecting a continuously changing organizational environment. Another challenge is to develop ICT that supports both the internal and the external stakeholders’ demands. In this study a qualitative research strategy was used to explore the demands on ICT expressed by managers from functional and process units at a community hospital. The results reveal a multitude of partially competing goals that can make the ICT development process confusing, poor in quality, inefficient and unnecessarily costly. Therefore, from the perspective of ICT development, the main task appears to be to coordinate the different visions and in particular clarify them, as well as to establish the impact that these visions would have on the forthcoming ICT application.

  • 338.
    Andersson, Bengt E. W.
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Samverkande informationssystem mellan aktörer i offentliga åtaganden: en teori om aktörsarenor i samverkan om utbyte av information1998Licentiate thesis, monograph (Other academic)
  • 339.
    Andersson, Daniel
    Linköping University, Department of Computer and Information Science, Software and Systems. Linköping University, The Institute of Technology.
    Integrated Test Environment2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    To implement a command line interpreter is normally an easy task. The task getsharder when adding requirements of multi instance functions and the system is torun on a multi-processor security critical embedded system. This thesis describesa first iteration of the system development. The project behind the thesis consistsof requirement elicitation, design, implementation and unit testing. The resultfrom the project is a working first version of the system.

    Download full text (pdf)
    Integrated Test Environment
  • 340. Order onlineBuy this publication >>
    Andersson, Dennis
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, The Institute of Technology.
    Mission Experience: How to Model and Capture it to Enable Vicarious Learning2013Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Organizations for humanitarian assistance, disaster response and military activities are characterized by their special role in society to resolve time-constrained and potentially life-threatening situations. The tactical missions that these organizations conduct regularly are significantly dynamic in character, and sometimes impossible to fully comprehend and predict. In these situations, when control becomes opportunistic, the organizations are forced to rely on the collective experience of their personnel to respond effectively to the unfolding threats. Generating such experience through traditional means of training, exercising and apprenticeship, is expensive, time-consuming, and difficult to manage.

    This thesis explores how and why mission experience should be utilized in emergency management and military organizations to improve performance. A multimedia approach for capturing mission experience has further been tested in two case studies to determine how the commanders’ experiences can be externalized to enable vicarious learning. These studies propose a set of technical, methodological, and ethical issues that need to be considered when externalizing mission experience, based on two aforementioned case studies complemented by a literature review. The presented outcomes are (1) a model aligning abilities that tactical organizations need when responding to dynamic situations of different familiarity, (2) a review of the usefulness of several different data sources for externalization of commanders’ experiences from tactical operations, and (3) a review of methodological, technical, and ethical issues to consider when externalizing tactical military and emergency management operations. The results presented in this thesis indicate that multimedia approaches for capturing mission histories can indeed complement training and exercising as a method for generating valuable experience from tactical missions.

    List of papers
    1. Sharing Mission Experience in Tactical Organisations
    Open this publication in new window or tab >>Sharing Mission Experience in Tactical Organisations
    2012 (English)In: ISCRAM 2012 Conference Proceedings. Book of Papers. 9th International Conference on Information Systems for Crisis Response and Management / [ed] Leon Rothkrantz, Jozef Ristvej and Zeno Franco, ISCRAM , 2012Conference paper, Published paper (Refereed)
    Abstract [en]

    A tactical organisation can be seen as an adhocracy designed to perform missions in uncertain, ambiguous and complex environments. Flexibility, adaptability, resilience, innovation, creativity and improvisation have all been identified as key skills for successful outcome of these missions. To learn skills associated with such abilities previous research has shown that knowledge acquired through experience plays an important role. It is therefore important that individuals, teams and organisations share and learn from experiences to improve their ability to cope with novel situations. In literature there is a lack of consistency in how these abilities are discussed, we therefore propose the FAIRIC model to help define and differentiate between the concepts. By unravelling some of the similarities and differences we create a common vocabulary to discuss knowledge gained from experience. This can help classify different experiences and provide a more systematic way of gathering knowledge on situational factors that influence the success of different actions and more unified interpretations that can assist design of knowledge representations to share mission experience over boundaries of time and space.

    Place, publisher, year, edition, pages
    ISCRAM, 2012
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-91985 (URN)978-0-86491-332-6 (ISBN)
    Conference
    The 9th International ISCRAM Conference on Information Systems for Crisis Response and Management, April 22-25, Vancouver, Canada
    Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2013-05-07Bibliographically approved
    2. Evaluation of Crisis Management Operations using Reconstruction and Exploration
    Open this publication in new window or tab >>Evaluation of Crisis Management Operations using Reconstruction and Exploration
    2008 (English)In: Proceedings of the 5th International ISCRAM Conference, Washington, DC: May 4-7 / [ed] Frank Fiedrich and Bartel Van de Walle, ISCRAM , 2008, p. 118-125Conference paper, Published paper (Refereed)
    Abstract [en]

    In this paper we present the Reconstruction and Exploration approach (R&E) and F-REX tool and their applications in a field exercise with the Swedish Rescue Services Agency with the purpose of investigating features needed for a computer supported approach for evaluation of large scale crisis management operations. After the exercise several interviews and one seminar were held to evaluate R&E as a representative for computer supported evaluation approaches for crisis management operations. Initial results indicate that multimedia presentation of key events from an operation can be very valuable not only to stimulate the participants to reflect on their own performance, but also to document and share lessons learned to non-participants.

    Place, publisher, year, edition, pages
    ISCRAM, 2008
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-91986 (URN)978-0-615-20697-4 (ISBN)
    Conference
    ISCRAM2008 - Creating Advanced Systems for Inter-organizational Information Sharing and Collaboration, Washington, DC, USA, May 4-7, 2008
    Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2015-08-19Bibliographically approved
    3. Reconstruction and Exploration of Large-scale Distributed Operations – Multimedia tools for Evaluation of Emergency Management Response
    Open this publication in new window or tab >>Reconstruction and Exploration of Large-scale Distributed Operations – Multimedia tools for Evaluation of Emergency Management Response
    2008 (English)In: Journal of Emergency Management, ISSN 1543-5865, Vol. 6, no 4, p. 31-47Article in journal (Refereed) Published
    Abstract [en]

    This study presents an approach for computer-supported reconstruction and exploration (R&E) of distributed tactical operations. The approach involves several steps for constructing a time-synchronized, event-driven multimedia model of the course of events collected from multiple sources in the operational environment and visualizes this model in the F-REX Studio multimedia suite. In this study, the use of R&E and F-REX is explored in large-scale emergency management exercises. The approach’s possibilities, limitations, and needs for modification are first outlined followed by a comparison to traditional quantitative and qualitative data collection methods applied in the same context. It is found that the R&E approach in combination with F-REX has several advantages in relation to the other methods, in terms of avoiding problems of retrospection and in being able to provide an overview of the entire operation based on multiple perspectives—addressing the question “why” something happened rather than “what happened.” Correctly used, multimedia-supported R&E can thereby be used for more solid evaluations of large-scale emergency management exercises and operations, thus contributing to more effective handling of future crises. Keywords: reconstruction & exploration, distributed tactical operations, emergency management, evaluation, computer technology

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-91987 (URN)
    Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2017-12-06Bibliographically approved
    4. Privacy and Distributed Tactical Operations Evaluation
    Open this publication in new window or tab >>Privacy and Distributed Tactical Operations Evaluation
    2011 (English)Conference paper, Published paper (Refereed)
    Abstract [en]

    In this study, thoughts on ethics of workplace monitoring are being applied to the very special domain of evaluations of tactical operations, such as military or crisis management exercises or operations. I try to find out if there are differences in the way we should regard workplace monitoring when it comes to this domain compared to standard workplaces such as offices, since the purpose of the surveillance is not to enforce discipline, but to evaluate the organizations’ ability to conduct a tactical operation. The study focuses on issues such as privacy and informed consent and the main purpose of the investigation is to structure a consistent ethical standpoint when it comes to operations’ evaluation by making parallels to related theories that I found correct and applicable. I conclude that is indeed reasonable to place other demands on crisis management workers than we would do on other work forces, and that it should therefore be easier to motivate workplace monitoring for the purpose of evaluating distributed tactical operations. I argue however, just as Miller does regarding police work, that upholding privacy can be a real problem when crisis management personnel are exposed to monitoring, even though it is intended for evaluation.

    Place, publisher, year, edition, pages
    CENTRIC, 2011
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-91988 (URN)978-1-61208-167-0 (ISBN)
    Conference
    The Fourth International Conference on Advances in Human-oriented and Personalized Mechanisms, Technologies, and Services, CENTRIC 2011, October 23-29, 2011, Barcelona, Spain
    Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2013-05-07Bibliographically approved
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    Mission Experience: How to Model and Capture it to Enable Vicarious Learning
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    omslag
  • 341.
    Andersson, Dennis
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, The Institute of Technology.
    Privacy and Distributed Tactical Operations Evaluation2011Conference paper (Refereed)
    Abstract [en]

    In this study, thoughts on ethics of workplace monitoring are being applied to the very special domain of evaluations of tactical operations, such as military or crisis management exercises or operations. I try to find out if there are differences in the way we should regard workplace monitoring when it comes to this domain compared to standard workplaces such as offices, since the purpose of the surveillance is not to enforce discipline, but to evaluate the organizations’ ability to conduct a tactical operation. The study focuses on issues such as privacy and informed consent and the main purpose of the investigation is to structure a consistent ethical standpoint when it comes to operations’ evaluation by making parallels to related theories that I found correct and applicable. I conclude that is indeed reasonable to place other demands on crisis management workers than we would do on other work forces, and that it should therefore be easier to motivate workplace monitoring for the purpose of evaluating distributed tactical operations. I argue however, just as Miller does regarding police work, that upholding privacy can be a real problem when crisis management personnel are exposed to monitoring, even though it is intended for evaluation.

  • 342.
    Andersson, Dennis
    et al.
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, The Institute of Technology.
    Pilemalm, Sofie
    Linköping University, Department of Management and Engineering, Information Systems. Linköping University, The Institute of Technology.
    Hallberg, Niklas
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Evaluation of Crisis Management Operations using Reconstruction and Exploration2008In: Proceedings of the 5th International ISCRAM Conference, Washington, DC: May 4-7 / [ed] Frank Fiedrich and Bartel Van de Walle, ISCRAM , 2008, p. 118-125Conference paper (Refereed)
    Abstract [en]

    In this paper we present the Reconstruction and Exploration approach (R&E) and F-REX tool and their applications in a field exercise with the Swedish Rescue Services Agency with the purpose of investigating features needed for a computer supported approach for evaluation of large scale crisis management operations. After the exercise several interviews and one seminar were held to evaluate R&E as a representative for computer supported evaluation approaches for crisis management operations. Initial results indicate that multimedia presentation of key events from an operation can be very valuable not only to stimulate the participants to reflect on their own performance, but also to document and share lessons learned to non-participants.

  • 343.
    Andersson, Dennis
    et al.
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, The Institute of Technology.
    Rankin, Amy
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, The Institute of Technology.
    Sharing Mission Experience in Tactical Organisations2012In: ISCRAM 2012 Conference Proceedings. Book of Papers. 9th International Conference on Information Systems for Crisis Response and Management / [ed] Leon Rothkrantz, Jozef Ristvej and Zeno Franco, ISCRAM , 2012Conference paper (Refereed)
    Abstract [en]

    A tactical organisation can be seen as an adhocracy designed to perform missions in uncertain, ambiguous and complex environments. Flexibility, adaptability, resilience, innovation, creativity and improvisation have all been identified as key skills for successful outcome of these missions. To learn skills associated with such abilities previous research has shown that knowledge acquired through experience plays an important role. It is therefore important that individuals, teams and organisations share and learn from experiences to improve their ability to cope with novel situations. In literature there is a lack of consistency in how these abilities are discussed, we therefore propose the FAIRIC model to help define and differentiate between the concepts. By unravelling some of the similarities and differences we create a common vocabulary to discuss knowledge gained from experience. This can help classify different experiences and provide a more systematic way of gathering knowledge on situational factors that influence the success of different actions and more unified interpretations that can assist design of knowledge representations to share mission experience over boundaries of time and space.

  • 344.
    Andersson, Dennis
    et al.
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, The Institute of Technology. Swedish Def Research Agency, Linkoping, Sweden.
    Rankin, Amy
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Arts and Sciences.
    Diptee, Darryl
    Naval Postgrad Sch, USA.
    Approaches to team performance assessment: a comparison of self-assessment reports and behavioral observer scales2017In: Cognition, Technology & Work, ISSN 1435-5558, E-ISSN 1435-5566, Vol. 19, no 2-3, p. 517-528Article in journal (Refereed)
    Abstract [en]

    Human factors research popularly employs perception-based techniques to investigate team performance and its dependency to cognitive processes. Such studies frequently rely upon either observer-based or self-assessment techniques to collect data. In this study, we examined behavioral observer ratings and self-assessment ratings for measuring team performance in virtual teams, with team performance regarded as a combination of task outcome and team cognition. Juxtaposing self-assessments and observer ratings from a quasi-experiment comparing team performance rating techniques reveals that they indeed produce overall similar results, with both singling out teamwork effectiveness ratings as the strongest contributor to overall team performance. However, the comparisons show remarkably low correlation on individual questionnaire items. The most striking difference is that the team members self-assessments of workload are lower than the corresponding observer ratings. In particular, the self-assessments do not correlate at all with overall team performance, whereas the observers workload ratings are more consistent with contemporary research that suggests a strong correlation between workload and team performance, suggesting that observer-based techniques are more reliable than self-assessments for assessing workload. For other ratings, the results show that the two techniques are fairly equal, suggesting that the choice between methods to employ can be deferred to other considerations such as obtrusiveness, accessibility, and resource availability.

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  • 345.
    Andersson, Ellen
    Linköping University, Department of Computer and Information Science.
    Cognitive Workload, Game Experience, and Intrinsic Motivation2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    When it comes to game design, two features that have been linked to the success of a game are playability and the subjective game experience. This is perhaps not surprising, as the main purpose of a game is to entertain. What cognitive factors that may underlie these features has, however, not been explored. This study examines the relationship between both workload and cognitive workload and player experience. The results suggest that an increase in workload, including cognitive workload, positively affect the player experience of the game as well as the player’s intrinsic motivation.

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  • 346.
    Andersson, Elsa
    Linköping University, Department of Computer and Information Science.
    Methods for increasing cohesion in automatically extracted summaries of Swedish news articles: Using and extending multilingual sentence transformers in the data-processing stage of training BERT models for extractive text summarization2022Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    Developments in deep learning and machine learning overall has created a plethora of opportunities for easier training of automatic text summarization (ATS) models for producing summaries with higher quality. ATS can be split into extractive and abstractive tasks; extractive models extract sentences from the original text to create summaries. On the contrary, abstractive models generate novel sentences to create summaries. While extractive summaries are often preferred over abstractive ones, summaries created by extractive models trained on Swedish texts often lack cohesion, which affects the readability and overall quality of the summary. Therefore, there is a need to improve the process of training ATS models in terms of cohesion, while maintaining other text qualities such as content coverage. This thesis explores and implements methods at the data-processing stage aimed at improving cohesion of generated summaries. The methods are based around Sentence-BERT for creating advanced sentence embeddings that can be used to rank sentences in a text in terms of if it should be included in the extractive summary or not. Three models are trained using different methods and evaluated using ROUGE, BERTScore for measuring content coverage and Coh-Metrix for measuring cohesion. The results of the evaluation suggest that the methods can indeed be used to create more cohesive summaries, although content coverage was reduced, which gives rise to the potential for extensive future exploration of further implementation. 

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  • 347.
    Andersson, Elsa
    et al.
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Science & Engineering.
    Jönsson, Arne
    Linköping University, Department of Computer and Information Science, Human-Centered systems. Linköping University, Faculty of Science & Engineering.
    Methods for increasing cohesion in automatically extracted summaries of Swedish news articles2022Conference paper (Refereed)
  • 348.
    Andersson, Erik
    et al.
    Linköping University, Department of Computer and Information Science.
    Combler, David
    Linköping University, Department of Computer and Information Science.
    Evaluation of Key Management Protocols and Their Implementations2018Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    When constructing a network system it is important to consider the attributes which define said system and how to best build around those attributes. In this report we’ve studied Key Management Protocols as well as 802.15.4 WPAN networks and how key managment is conducted in such networks. This was done to better understand how Key Management Protocols themselves work and if, or how, they differ when used in 802.15.4 networks.

    In this report we studied 4 different Key Management Protocols: IKEv2,HIPv2,PANA and 802.1X as well as their various implementations. Based on the information gathered we analyzed how an implementation would work according to IEEE 802.15.9.

    Firstly we found was that IKEv2 offers a lot of functionality at the cost of system complexity and required a lot of memory. It also required major modifications to work in 802.15.4 networks.

    Secondly we found that HIPv2 offers the ability to separate the locator and identifier tags of TCP/IP and is lightweight. It doesn’t use IP or TCP/UDP and as such required minor changes to work in 802.15.4 networks.

    Finally, PANA and 802.1X both offer client-to-network authentication using EAP and use a moderate to high amount of space. 802.1X required a moderate amount of changes to work in 802.15.4 networks. PANA on the other hand required few changes, though it should not be used as a general purpose Key Management Protocol in 802.15.4 networks.

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  • 349.
    Andersson, Erik Olov Mårten
    Linköping University, Department of Computer and Information Science.
    A Gameful Quest to Make Second Language Acquisition Fun2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This study explores the application of principles from game design, and the motivational psychology it is founded upon, to the domain of second language acquisition. A gameful design process based on playtesting andanalysis with design lenses is adapted and used to iteratively design and develop a system for conversation practice with the goal of creating a motivating and engaging experience.The results indicate effectiveness of the process, but generalizing the results would require further research with bigger sample sizes and studies with varied core activities.

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  • 350.
    Andersson, Filip
    Linköping University, Department of Computer and Information Science, Software and Systems.
    Fault Diagnosis in Distributed Simulation Systems over Wide Area Networks using Active Probing2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The domain of distributed simulation is growing rapidly. This growth leads to larger and more complex supporting network architectures with high requirements on availability and reliability. For this purpose, efficient fault-monitoring is required. This work is an attempt to evaluate the viability of an Active probing approach in a distributed simulation system in a wide area network setting. In addition, some effort was directed towards building the probing-software with future extensions in mind. The Active probing approach was implemented and tested against certain performance requirements in a simulated environment. It was concluded that the approach is viable for detecting the health of the network components. However, additional research is required to draw a conclusion about the viability in more complicated scenarios that depend on more than the responsiveness of the nodes. The extensibility of the implemented software was evaluated with the QMOOD-metric and not deemed particularly extensible.

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