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  • Nackfors, Glenn
    University of Skövde, School of Engineering Science.
    Factory optimization using DES2016Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Discrete Event Simulation (DES) has been a powerful tool for modeling and optimization of production lines for many years. Developing detailed models may be very time consuming and might also be computationally costly to execute, especially if optimization techniques are to be applied. Aggregation techniques, simplifying a detailed system into fewer objects, can be an effective method to reduce the required computational resources as well as a way to shorten the development time. An aggregated model can be used to identify the main constraints in a system, dimensioning inter-line buffers, and focus development activities on the critical issues from a system performance perspective.

    An aggregated model of a real-world plant wide production system has already been developed in the discrete event simulation software FACTS Analyzer. Due to the limitations of FACTS Analyzer this model was instead rebuilt using the discrete event simulation software Plant Simulation which, while less user friendly, has much more configuration options. This model is then validated against the FACTS Analyzer model to ensure accurate results that can be implemented on a real life system.

    In addition some typical optimization experiments are carried out on the Plant Simulation model and the results analyzed. The first of these optimizations alters the buffer sizes to find the minimum amount of buffer capacity needed to get the minimum lead time while maintaining the highest possible throughput. The second optimization uses the same parameters but also adds alteration of the batch size. Both of these optimizations shows that it is possible to get better results with lower settings on both the buffer capacity and batch size then the default value.

    At the end of the report the project is evaluated and conclusions are drawn on what can be improved in the model, such as adding more streamlined updating of variant sequence.  Additionally future experiments that can be interesting to look at is specified based upon the results from the project.  

  • Svantesson, Björn
    University of Skövde, School of Informatics.
    Software Defined Networking: Virtual Router Performance2016Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Virtualization is becoming more and more popular since the hardware that is available today often has theability to run more than just a single machine. The hardware is too powerful in relation to the requirementsof the software that is supposed to run on the hardware, making it inefficient to run too little software ontoo powerful of machines. With virtualization, the ability exists to run a lot of different software on thesame hardware, thereby increasing the efficiency of hardware usage.Virtualization doesn't stop at just virtualizing operating systems or commodity software, but can also beused to virtualize networking components. These networking components include everything from routersto switches and are possible to set up on any kind of virtulized system.When discussing virtualization of networking components, the experssion “Software Defined Networking”is hard to miss. Software Defined Networking is a definition that contains all of these virtualized networkingcomponents and is the expression that should be used when researching further into this subject. There'san increasing interest in these virtualized networking components now in relation to just a few years ago.This is due to company networking becoming much more complex now in relation to the complexity thatcould be found in a network a few years back. More services need to be up inside of the network and a lotof people believe that Software Defined Networking can help in this regard.This thesis aim is to try to find out what kind of differences there are between multiple different softwarerouters. Finding out things like, which one of the routers that offer the highest network speed for the leastamount of hardware cost, are the kind of things that this thesis will be focused on. It will also look at somedifferent aspects of performance that the routers offer in relation to one another in order to try toestablish if there exists any kind of “best” router in multiple different areas.The idea is to build up a virtualized network that somewhat relates to how a normal network looks insmaller companies today. This network will then be used for different types of testing while having thesoftware based router placed in the middle and having it take care of routing between different local virtualnetworks. All of the routers will be placed on the same server and their configuration will be very basicwhile also making sure that each of the routers get access to the same amount of hardware.After initial testing, all routers that perform bad will be opted out for additional testing. This is done tomake sure that there's no unnecessary testing done on routers that seem to not be able to keep up withthe other ones. The results from these tests will be compared to the results of a hardware router with thesame kind of tests used with it in the middle in relation to the tests the software routers had to go through.The results from the testing were fairly surprising, only having one single router being eliminated early onas the remaining ones continued to “battle” one another with more tests. These tests were compared tothe results of a hardware router and the results here were also quite surprising with a much betterperformance in many different areas from the software routers perspective.

  • Toftedahl, Marcus
    et al.
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Berg Marklund, Björn
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Engström, Henrik
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Backlund, Per
    University of Skövde, School of Informatics. University of Skövde, The Informatics Research Centre.
    Global Influences on Regional Industries: Game development in Nordic countries, China and India2016In: Decoding the Academic-Industrial-Gameplay Complex: Digital Game Practice, Research and Study in China, Taiwan and Chinese-Speaking Regions, 2016Conference paper (Refereed)
    Abstract [en]

    The game development industry has historically been strongly associated with a few particularly dominant actors, namely Japan and the US. As a result, video game development processes and game content that have originated from these actors are often used as a benchmark for what game development is and can be. Discussing the games industry from these perspectives can, however, gloss over important nuances that make other game development regions unique. With this in mind, this paper intends to discuss the ways in which different cultural and regional contexts are reflected in the structure of local game development industries and, to some extent, in produced game content. To inform this discussion, the authors use the foundation and growth of game development practices in three different regions: the Nordic region, India, and China. These three regions serve as specific exemplifying cases of how video game industries and praxis can take different shapes depending on what resources and components they have available. The paper concludes that all regional games industries and game development practices are heavily influenced by the precedent set by historically dominant actors. This results in game content and development practices that often mimics pre-established standards. But, over time, the conditions surrounding the formation of regional industries manifest themselves in more locally unique content and development processes.

  • Eriksson, Roberta
    et al.
    University of Skövde, School of Health and Education.
    Prokopiw, David
    University of Skövde, School of Health and Education.
    Ska anhöriga närvara vid HLR? Ett dilemma för sjuksköterskor: En litteraturöversikt2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Cardiopulmonary resuscitation (CPR) is the first emergency procedure for a cardiac arrest. Ethical guidelines for CPR in Sweden encourage family presence during appropriate circumstances. Nurses have different roles during a resuscitation effort which includes: participation in CPR, supporting the family, etc.. Nurses should include family members in the patient's perspective and they should implement family members’ participation through interpersonal relationship and mutuality in negotiation. Purpose: To describe nurses' perceptions of family presence during CPR on adult patients in a hospital setting. Method: A literature review with 13 articles, consisting of 7 qualitative, 4 quantitative and 2 qualitative/quantitative analyzed. Results: Three categories emerged from the analysis:  A difficult decision, A challenge to deal with family members’ presence, and Opportunity with possibilities, with 7 subcategories. Conclusion: The decision to ask family to be present during CPR is perceived by nurses as a difficult one. Organizational barriers and the emotional reactions of families are factors that influence their perceptions about asking family to be present or not. Nurses perceive that it is a challenge to deal with family presence because it creates uncertainty and requires additional personal. Family presence is perceived by nurses as an opportunity with considerable potential to involve the patient’s family and for the nurses themselves to development within their profession.