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  • 46501.
    Öhman, Christina
    et al.
    STATIC!.
    Backlund, Sara
    STATIC!.
    Redström, Johan
    RISE, Swedish ICT, Interactive Institute. Design Research Unit.
    Mazé, Ramia
    RISE, Swedish ICT, Interactive Institute. Design Research Unit.
    Ilstedt Hjelm, Sara
    STATIC!.
    Routarinne, Sara
    STATIC!.
    Static! Designing for Energy Awareness2010 (ed. 20)Book (Other academic)
    Abstract [en]

    From the boost of the first cup of coffee in the morning to the glow of a nightlight that keeps a child company after dark, much of our contemporary lifestyles is powered by electricity. Today, however, the economic and environmental costs of energy require us to think again. While recognizing the complex social functions and cultural forms of electricity in everyday life, the current challenge for design is to change practices and patterns of (over)consumption. Static! explores design as a basis for increasing awareness of energy. Familiar furnishings and products have been reinterpreted to materialize electricity, to make it more visible and tangible for people. The resulting series of conceptual design examples express the poetics – and politics – of everyday electricity consumption. A design research project at the Interactive Institute funded by the Swedish Energy Agency, Static! has proved to be a pioneer in opening a current and critical research area at the intersection of design, energy and information technology. This book presents the Static! design examples and perspectives on issues in (sustainable) design today. Grounded in passion and humor, as well as rigor and research, the book asks designers and consumers – that is, all of us – to rethink the form, and future, of electricity in the world around us.

  • 46502.
    Öhman, Gerth
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Idé och innovation2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Present thesis is to deepen the current knowledge about the concept and development of ideas of innovators and the potential small businesses in rural areas has to adopt innovation and new technology. The thesis is limited tostudying the process itself and the progression from concept and development of ideas for invention and innovation to market and customer. The research questions include: What motivates an inventor to innovate? Howto practice innovation in small companies? How are innovators approach toproblem solving? What opportunities exist for small businesses in rural areas toadopt innovations and new technologies? The thesis also discusses on the one hand innovators approaches to motivationand attitude and on the other hand, how ideas are selected and then developed inthe process and progression in the author via the invention to market andcustomer innovation. In the present thesis has been both quantitative andqualitative approach, based on behavioural research.Important conclusions from this thesis is: that the innovation process should bedeleted and recorded by the (basic) idea and author; innovator must remain in thedevelopment of ideas with complementary and alternative ideas, innovationprocess, the progression from idea to innovation should be based on a “bottom up” perspective, where the patent law “previous user rights” supports innovatorsinvolvement in the process and progression

  • 46503.
    Öhman, Gerth
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Idé och innovation2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Present thesis is to deepen the current knowledge about the concept anddevelopment of ideas of innovators and the potential small businesses in ruralareas has to adopt innovation and new technology. The thesis is limited tostudying the process itself and the progression from concept and development ofideas for invention and innovation to market and customer.The research questions include: What motivates an inventor to innovate? Howto practice innovation in small companies? How are innovators approach toproblem solving? What opportunities exist for small businesses in rural areas toadopt innovations and new technologies?The thesis also discusses on the one hand innovators approaches to motivationand attitude and on the other hand, how ideas are selected and then developed inthe process and progression in the author via the invention to market andcustomer innovation. In the present thesis has been both quantitative andqualitative approach, based on behavioural research.Important conclusions from this thesis is: that the innovation process should bedeleted and recorded by the (basic) idea and author; innovator must remain in thedevelopment of ideas with complementary and alternative ideas, innovationprocess, the progression from idea to innovation should be based on a ʺbottom upʺperspective, where the patent law “previous user rights” supports innovatorsinvolvement in the process and progression

  • 46504.
    Öhman, Gerth
    et al.
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Sandberg, Karl W
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    A phenomenological study of innovators attitude to creative problem solving2009In: , 2009Conference paper (Refereed)
    Abstract [en]

    The aim of this initial study was to investigate innovators attitudes to creative problem solving. A phenomenological method has been used. Five innovators included in present study. The outcome of the analysis of the interviews showed clearly those innovators identify attitude factors as essential to creative problem solving; and that can guide other people.

  • 46505.
    Öhman, Gerth
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Sandberg, Karl W
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    A phenomenological study of innovators attitude to creative problem solving2009In: The 17th World Congress on  Ergonomics, IEA, 2009Conference paper (Refereed)
  • 46506.
    Öhman, Gerth
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Sandberg, Karl W
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Inventor motivations to go from idea to innovation?2011In: Ergonomis for all: Celebrating PPCOE's 20 Years of Excellence - Selected Papers of the Pan-Pacific Conference on Ergonomics, PPCOE 2010 / [ed] An-Hsiang Wang, CRC Press, 2011, 461-464 p.Conference paper (Refereed)
    Abstract [en]

    The objective of present paper is to describe the motivations that underlie the choices made by inventors in the development of their technologies. These classifications can help managers of innovation programs direct sparse resources to inventors with the greatest probability of commercial success. The categorisation of motivation to go from idea to innovation and commercialisation of new technologies is presented for inventors for the small business in rural area of Sweden. The main results showed least eight different inventor motivations.

  • 46507.
    Öhman, Gerth
    et al.
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Sandberg, Karl W
    Mittuniversitetet, Institutionen för informationsteknologi och medier.
    Inventor motivations to go from idea to innovation?2011In: Ergonomis for all: Celebrating PPCOE's 20 Years of Excellence / [ed] Lin, Dyi-Yih Michael, Leiden: CRC Press , 2011, 461-464 p.Conference paper (Refereed)
    Abstract [en]

    The objective of present paper is to describe the motivations that underlie the choices made by inventors in the development of their technologies. These classifications can help managers of innovation programs direct sparse resources to inventors with the greatest probability of commercial success. The categorisation motivation to go from idea to innovation and commercialisation of new technologies is presented for inventors for the small business in rural area of Sweden. The main results showed least eight different inventor motivations.

  • 46508.
    Öhman, Marie-Louise
    Umeå University, Faculty of Social Sciences, Department of Statistics.
    A Monte Carlo study of some censored data Wilcoxon rank tests1990In: Biometrical Journal, ISSN 0323-3847, Vol. 32, no 6, 721-735 p.Article in journal (Refereed)
    Abstract [en]

    The variance estimators usually applied for the generalized censored data Wilcoxon rank tests by Gehan and Peto & Prentice, are heavily biased in unbalanced problems. This paper reports the results of a Monte Carlo simulation study, where jackknifing is used to construct estimators of variance. Size, power and variance properties are compared for five variance estimators, when using different combinations of group sizes, failure and censoring patterns. The variance estimators are the permutational, the conditional permutational and the jackknife variance estimators for the statistic of Gehan and the asymptotic and the jackknife variance estimators for the statistic of Peto & Prentice. It appears that observed size, power and variance properties may be improved by using the jackknife variance estimator, when comparing to the variance estimators usually applied.

  • 46509.
    Öhman, Marie-Louise
    Umeå University, Faculty of Social Sciences, Department of Statistics.
    Aspects of analysis of small-sample right censored data using generalized Wilcoxon rank tests1994Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The estimated bias and variance of commonly applied and jackknife variance estimators and observed significance level and power of standardised generalized Wilcoxon linear rank sum test statistics and tests, respectively, of Gehan and Prentice are compared in a Monte Carlo simulation study. The variance estimators are the permutational-, the conditional permutational- and the jackknife variance estimators of the test statistic of Gehan, and the asymptotic- and the jackknife variance estimators of the test statistic of Prentice. In unbalanced small sample size problems with right censoring, the commonly applied variance estimators for the generalized Wilcoxon rank test statistics of Gehan and Prentice may be biased. In the simulation study it appears that variance properties and observed level and power may be improved by using the jackknife variance estimator.

    To establish the sensitivity to gross errors and misclassifications for standardised generalized Wilcoxon linear rank sum statistics in small samples with right censoring, the sensitivity curves of Tukey are used. For a certain combined sample, which might contain gross errors, a relatively simple method is needed to establish the applicability of the inference drawn from the selected rank test. One way is to use the change of decision point, which in this thesis is defined as the smallest proportion of altered positions resulting in an opposite decision.

    When little is known about the shape of a distribution function, non-parametric estimates for the location parameter are found by making use of censored one-sample- and two-sample rank statistics. Methods for constructing censored small sample confidence intervals and asymptotic confidence intervals for a location parameter are also considered. Generalisations of the solutions from uncensored one-sample and two-sample rank tests are utilised. A Monte-Carlo simulation study indicates that rank estimators may have smaller absolute estimated bias and smaller estimated mean squared error than a location estimator derived from the Product-Limit estimator of the survival distribution function.

    The ideas described and discussed are illustrated with data from a clinical trial of Head and Neck cancer.

  • 46510.
    Öhman, Marie-Louise
    Umeå University, Faculty of Social Sciences, Department of Statistics.
    Contributions to generalized Wilcoxon rank tests1992Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In unbalanced small sample size problems with right censorings, the variance estmators of linear rank statistics, may be biased. This is the case with the commonly applied variance estimators for the generalized Wilcoxon rank test statistics of Gehan and Prentice. The bias and variance of different variance estimators and observed significance level and power for standardized tests are compared in a Monte Carlo simulation study. The variance estimators are the permutational-, the conditional permutational- and the jackknife variance estimators for the statistic Gehan, and the asymptotic- and the jackknife variance estimators for the statistic of Prentice. It appears that observed level and power and variance properties may be improved by using the jackknife variance estimator.

    Further, The sensitivity curves of Turkey are used to establish the sensitivity to gross errors and misclassifications for standardized generalized Wilcoxon rank sum statistics in small samples with right censorings. For a certain combined sample, which might contain gross errors, a relatively fast method is needed to establish the applicability of the inference drawn from the selected ranktest. Ome way is to use the "change of decision point" (cdp), which in this thesis is defined as the smallest proportion of altered positions resulting in an opposite decision.

  • 46511.
    Öhman, Marie-Louise
    Umeå University, Faculty of Social Sciences, Department of Statistics.
    Estimating location parameters using censored rank statistics1995In: Biometrical Journal, ISSN 0323-3847, Vol. 37, no 7, 767-782 p.Article in journal (Refereed)
    Abstract [en]

    In this paper censored data rank location estimators are obtained by using censored one-sample rank test statistics of the location parameter and censored two-sample rank test statistics of the shift of location parameter. Also, methods for constructing censored small sample confidence intervals and asymptotic confidence intervals for the location are considered. Generalizations of the solutions from uncensored one-sample and two-sample rank tests are utilized.

  • 46512.
    Öhman, Marie-Louise
    Umeå University, Faculty of Social Sciences, Department of Statistics.
    Generalized Wilcoxon rank tests and sensitivity curves1991In: Biometrical Journal, ISSN 0323-3847, Vol. 33, no 7, 789-806 p.Article in journal (Refereed)
    Abstract [en]

    In this paper we use the sensitivity curves of TUKEY (1977) and the change of decision point (cdp) (a modified version of the breakdown point of YLVISAKER, 1977), supplemented by simulation studies to acquire knowledge about sensitivity in generalized Wilcoxon rank test statistics. Sensitivity depends on balanced or unbalanced sample size cases, censoring, combinations of failure distributions and sources of errors in the data. It is important to consider the quality of the data, and the results show that cdp and some properties of the sensitivity curves may serve as a hint when selecting a test statistic and when making a decision for a given test statistic.

  • 46513.
    Öhman Persson, Jenny
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Human-Computer Interaction. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Human-Computer Interaction.
    The Obvious & The Essential: Interpreting Software Development & Organizational Change2004Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Examining how our basic values affect development processes is the overall theme of this thesis. In practice, the question is investigated in relation to software development and organizational change and in research, in relation to science and its relationship to common sense, specifically within the area of Human Computer Interaction. The thesis discusses how it might be possible to discover what is essential for development processes and why the essential may be interpreted as something other than the simply obvious. This thesis examines ways of studying and understanding our social environment and development processes, particularly those concerning people, organizations and software. The empirical examples deal with a software development project and a project that scrutinized the strategy for a governmental authority’s business and information technology. Attitudes are discussed in terms of how they view the user, the customer, the software developers, the software, organizational and implementation processes, organizational management, aesthetic values, functionality and use, research, methods, paradigmatic approaches, ethical issues, psychological reactions, sociological prerequisites, categorizations of people and stress-related health consequences. One particular prerequisite for developing superior computer-supported office work has repeatedly presented itself: an open, questioning attitude towards the software development process, towards organizational change and towards the people working in the organizations. A similar attitude towards research and its design can be crucial to the development of new knowledge. This circumstance can be interpreted as an indication of how important it is that we be aware of and question our preconceived notions, in order to develop an autonomous behavior where we take responsibility for our actions. By doing so, we can avoid misinterpretations and not get trapped into making categorizations that are simply obvious. This is essential and must be emphasized in our search for the path to »healthy work«.

  • 46514. Öhman, Tobias
    et al.
    Salvi, Giampiero
    KTH, Superseded Departments, Speech, Music and Hearing.
    Using HMMs and ANNs for mapping acoustic to visual speech1999In: TMH-QPSR, Vol. 40, no 1-2, 45-50 p.Article in journal (Other academic)
    Abstract [en]

    In this paper we present two different methods for mapping auditory, telephonequality speech to visual parameter trajectories, specifying the movements of ananimated synthetic face. In the first method, Hidden Markov Models (HMMs)where used to obtain phoneme strings and time labels. These where thentransformed by rules into parameter trajectories for visual speech synthesis. In thesecond method, Artificial Neural Networks (ANNs) were trained to directly mapacoustic parameters to synthesis parameters. Speaker independent HMMs weretrained on a phonetically transcribed telephone speech database. Differentunderlying units of speech were modelled by the HMMs, such as monophones,diphones, triphones, and visemes. The ANNs were trained on male, female , andmixed speakers.The HMM method and the ANN method were evaluated through audio-visualintelligibility tests with ten hearing impaired persons, and compared to “ideal”articulations (where no recognition was involved), a natural face, and to theintelligibility of the audio alone. It was found that the HMM method performsconsiderably better than the audio alone condition (54% and 34% keywordscorrect, respectively), but not as well as the “ideal” articulating artificial face(64%). The intelligibility for the ANN method was 34% keywords correct.

  • 46515.
    Öhrman, Frida
    Mälardalen University, Department of Innovation, Design and Product Development.
    Texter om QUASI-projektet: Att popularisera forskningsinformation2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    QUASI-projektet är ett tvärvetenskapligt forskningsprojekt som inkluderar universitet och högskolor i fem europeiska länder. QUASI-samarbetet fokuserar på forskning om jästceller. Projektet avslutades i maj 2007 och de vetenskapliga resultaten ska förklaras för allmänheten. Syftet med mitt examensarbete har varit att utforma lättbegripliga texter om QUASI-projektet för att informera allmänheten om projektet och resultaten. Texterna ska publiceras på en webbsida. Min frågeställning har varit: Hur förenklar man forskningsinformation så att människor utan bakgrundskunskaper i ämnet förstår informationen på ett bra sätt? Jag har använt flera olika metoder för att komma fram till ett slutresultat. Genom att samla in litteratur och genomföra en enkätundersökning fick jag ett material att utgå från. Därefter har jag producerat mina texter, utprovat dem på tänkta användare, bearbetat och utprovat igen. Jag har även utprovat bilder i texterna, och sedan låtit en illustratör göra nya bilder. Jag har arbetat fram texter som enligt utprovningar är lättbegripliga för målgruppen. Jag blev klar med mina texter i tid och de blev godkända av uppdragsgivaren. Därmed har jag uppnått syftet med mitt examensarbete. Jag har lärt mig att det är väldigt personligt hur man populariserar forskning. Att skriva texter är ett hantverk som tar tid att lära sig. Jag har utarbetat ett sätt som fungerar bra för mig, men jag tror att alla har sina egna sätt att arbeta på. Det viktigaste är att man utprovar sitt material i flera omgångar på tänkta slutanvändare, och verkligen lyssnar på vad de har att säga och ändrar sina texter efter det.

  • 46516.
    Öhrn, Henrik
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    NoSQL-databaser och utnyttjandet av en grafdatabas i ett transportnätverk2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Den allmänna kunskapen om NoSQL-databaser är begränsad. Den här uppsatsen koncentrerar sig på att sammanställa egenskaper och information om för- och nackdelar som rör dessa databastyper samt relationsdatabaser i en undersökning. Uppsatsen belyser även användningsområden för de olika databastyperna och i en fallstudie testas en grafdatabas förmåga att representera och utföra sökningar av data från ett järnvägsspårnät. Problemområdena undersöktes genom att samla information om olika typer av databaser från artiklar och böcker. Tillämpningsfallet i fallstudien implementerades och testades i en grafdatabas. Resultatet av undersökningen visade att NoSQL-databaser är ett intressant alternativ i vissa fall men att mycket hänsyn måste tas innan man väljer vilken typ av databas som är mest lämpad i den specifika tillämpningen. Resultatet av fallstudien visar att en grafdatabas är särdeles lämpad för att representera och utföra operationer på ett transportnätverk. Detta till stora delar beroende på dess förmåga att representera kopplingarna i ett transportnätverk och i form av de operationerna som finns i grafteorin och som grafmodellen erbjuder.Nyckelord: nosql, relationsdatabas, nyckel/värde-databas, kolumndatabas, objektdatabas, dokumentdatabas, grafdatabas, järnvägsnätverk, transportnätverk

  • 46517.
    Öhrn, Kristina
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Different Mapping Techniques for Realistic Surfaces2008Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [en]

    The different mapping techniques that are used increases the details on surfaces without increasing the number of polygons. Image Based Sculpting tools in the program Modo and Z-Brush is used to create folds and wrinkles from photographs of actual fabrics instead of trying to create these shapes by modeling them. This method makes it easier to achieve photorealistic renderings and produce as realistic fabric dynamics as possible when they are applied on objects.

  • 46518.
    Öhrn, Markus
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Implementation av ett Content Management System2006Student paper second term, 10 points / 15 hpStudent thesis
    Abstract [sv]

    Under de senaste åren har webbplatser blivit allt mer komplexa och informationen som ska visas och hanteras allt större. För att underlätta hantering och administration av dessa system har många CMS-system vuxit fram. Dessa system kan skilja sig mycket beträffande pris och funktionalitet, allt från mindre open source system till stora komplexa kommersiellt drivna system. Detta arbete bygger på att skräddarsy ett CMS-system för administration och hantering av innehåll på diverse artist sidor, som hanteras av ett medieföretag. Systemet använder tekniker som JavaScript, PHP, MySQL som grund för dess uppbyggnad. Resultatet av detta arbete blev ett CMS-system där användaren genom att logga in på systemet, enkelt kan hantera och uppdatera bilder, nyheter, textstrukturer, skicka och hantera nyhetsbrev etc.

  • 46519.
    Öhrström, Fredrik
    Linköping University, Department of Computer and Information Science.
    The Indie Developer’s guide to immersive tweens and animation: What you need to know as a programmer to animate and increase immersion2016Independent thesis Basic level (degree of Bachelor), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Some games are grabbing your attention more than others. Some even do it so well people even lose track of time and their surroundings.

    Why does this happen? And how can the effect be harnessed for your own game?

    This report studies what immersion is and subjects related to it, such as richness and flow, and then how and what kind of easy animations and effects that build on these concepts that you can create in a 2D puzzle game. Most of the effects, animations and ideas can probably be carried over to other game types without much difficulty if you want a more immersive product.

    In the end, the player experience is tested by two surveys to see if players were immersed, PANAS and IEQ. The results go over what kind of effects were implemented and the surveys showed that most players were a bit immersed and that they enjoyed the graphics of the game.

  • 46520.
    Öigaard, Sandra
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Programming language & Gender2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Once women were the pioneers within the tech industry, but during the last decades the amount of women who choose a career within computer science has decreased rapidly. Programming languages have evolved during the last decades and because of the growing gender gap in the industry, they have done so involuntarily in the absence of women. The imbalance raises the question if the tech industry and the programming languages have been adapted for a more masculine way of developing software. A quantitative study and a literature review evaluates if there is a need for a computerlanguage developed towards women. The study comes to the conclusion that there is no need for a female inspired computer language, but the way computer languages are taught suits the male way of thinking better than the female way.

  • 46521.
    Öjebo, Erik
    Örebro University, School of Science and Technology.
    Objekt-relationsmappning i datacentrerad applikation2009Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report presents a study of six different object-relational mapping frameworks, namely Entity Framework, LINQ to SQL, NHibernate, Castle ActiveRecord, MyGeneration Doodads and Subsonic. The study describes the strengths and weaknesses of the various frameworks and discusses when each framework is appropriate to use.

    The frameworks that were judged to be the most interesting were NHibernate and Entity Framework, since they provide flexible mapping between the domain model and the underlying database schema as well as good availability of documentation and literature.

    The study was used as a basis for deciding which of the frameworks that should be used in a rewrite of an existing application for the IT consulting company Sogeti. The framework that was considered the most appropriate for the application was NHibernate.

  • 46522.
    Öjerteg, Theo
    Linköping University, Department of Electrical Engineering.
    Design and implementation of test a tool for the GSM traffic channel.2002Independent thesis Basic level (professional degree)Student thesis
    Abstract [en]

    Todays’ systems for telecommunication are getting more and more complex. Automatic testing is required to guarantee quality of the systems produced. An actual example is the introduction of GPRS traffic in the GSM network nodes. This thesis investigates the need and demands for such an automatic testing of the traffic channels in the GSM system. A solution intended to be a part of the Ericsson TSS is proposed. One problem to be solved is that today’s tools for testing do not support testing of speech channels with the speech transcoder unit installed. As part of the investigation, a speech codec is implemented for execution on current hardware used in the test platform. The selected speech codec is the enhanced full rate codec, generating a bitstream of 12.2 kbit/s, and gives a good trade-off between compression and speech quality. The report covers the design of the test tool and the implementation of speech codec. Particularly performance problems in the implementation of the encoder will be addressed.

  • 46523.
    Öktem, Ozan
    et al.
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics (Div.).
    Chen, Chong
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Mathematics (Div.). Chinese Academy of Sciences, China.
    Onur Domaniç, N.
    Ravikumar, P.
    Bajaj, C.
    Shape-based image reconstruction using linearized deformations2017In: Inverse Problems, ISSN 0266-5611, E-ISSN 1361-6420, Vol. 33, no 3, 035004Article in journal (Refereed)
    Abstract [en]

    We introduce a reconstruction framework that can account for shape related prior information in imaging-related inverse problems. It is a variational scheme that uses a shape functional, whose definition is based on deformable template machinery from computational anatomy. We prove existence and, as a proof of concept, we apply the proposed shape-based reconstruction to 2D tomography with very sparse and/or highly noisy measurements.

  • 46524.
    Ökvist, Nicklas
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Furberg, Max
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Analysmodell för inbyggt dataskydd och dataskydd som standard2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 46525.
    Ölander, Jonas
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Löfqvist, Andreas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Utveckling av stödverktyg för livsmedels- & miljöinspektörer2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Gävle kommuns miljö- och livsmedelsinspektörer utför inspektioner hos ca 660 företag och organisationer inom Gävle kommun. Information om organisationer och inspektioner hanteras av ett ärendehanteringssystem. Detta ärendehanteringssystem är inte anpassat för sättet inspektörerna arbetar, vilket gör att de tvingas komplettera viss funktionalitet med ett Exceldokument. Detta Exceldokument löser vissa problem men fungerar inte bra. Detta arbetes syfte och mål är att utveckla en grund till en webbapplikation, i beta-stadiet, vilket ska kunna ersätta det Exceldokument inspektörerna arbetar med och effektivisera deras arbete genom att göra den verksamhetsanpassad. Arbetet resulterade i en webbapplikation vilket effektiviserar inspektörernas arbetssätt. Webbapplikationen är utformad med responsivt gränssnitt. Omdömet av webbapplikationen var positivt och visade på ett förbättrat arbetssätt.

  • 46526.
    Ölundh, Gunilla
    et al.
    KTH, Superseded Departments, Machine Design.
    Ritzén, Sofia
    KTH, Superseded Departments, Machine Design.
    Making an ecodesign choice in project portfolio selection2004In: Proceedings - 2004 IEEE International Engineering Management Conference: Innovation and Entrepreneurship for Sustainable Development, 2004, 913-917 p.Conference paper (Refereed)
    Abstract [en]

    Project portfolio management is about selecting the right development projects for a company in order to secure that the company is competitive. However, many companies lack a structured process for selecting new development projects. Several significant decisions are taken in the pre-specification phases of product development. Early decisions are taken that affect the environmental impact of a product. In this paper we describe a proactive environmental design approach. Environmental considerations are included into the process of selecting new project development projects and into the decision preparation phase for product development.

  • 46527.
    Ölvingson, Christina
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    On development of information systems with GIS functionality in public health informatics: a requirements engineering approach2003Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Public health informatics has in recent years emerged as a field of its own from medical informatics. Since public health informatics is newly established and also new to public health professionals, previous research in the field is relatively scarce. Even if the overlap with medical informatics is large, there are differences between the two fields. Public health is, for example, more theoretical and more multi-professional than most clinical fields and the focus is on populations rather than individuals. These characteristics result in a complex setting for development of information systems. To our knowledge there exist few systems that support the collaborative process that constitutes the foundation of public health programs. Moreover, most applications that do support public health practitioners are small-scale, developed for a specific purpose and have not gained any wider recognition.

    The main objective of this thesis is to explore a novel approach to identifying the requirements for information system support with geographical information system (GIS) functionality in public health informatics. The work is based on four case studies that are used to provide the foundation for the development of an initial system design. In the first study, problems that public health practitioners experience in their daily work were explored. The outcome of the study was in terms of descriptions of critical activities. In the second study, the use case map notation was exploited for modeling the process of public health programs. The study provides a contextual description of the refinement of data to information that could constitute a basis for both political and practical decision in complex inter-organizational public health programs. In the third study, ethical conflicts that arose when sharing geographically referenced data in public health programs were analyzed to find out how these affect the design of information systems. The results pointed out issues that have to be considered when developing public health information systems. In the fourth study, the use of information systems with GIS functionality in WHO Safe Communities in Sweden and the need for improvements were explored. The study resulted in identification of particular needs concerning information system support among public health practitioners.

    From these studies, general knowledge about the issues public health practitioners experience in daily practice was gained and the requirements identified were used as a starting-point for the design of information systems for Motala WHO Safe Community.

    The main contributions of the thesis involve two areas: public health informatics and requirements engineering. First, a novel approach to system development in public health informatics is presented. Second, the application of use case maps as a tool for requirements engineering in complex settings such as public health programs is presented. Third, the introduction of requirements engineering in public health informatics has been exemplified. The contributions of the thesis should enhance the possibility to perform more adequate requirements engineering in the field of public health informatics. As a result, it should be possible to develop information systems that better meet the needs in the field of public health. Hence, it contributes to making the public health programs more effective, which in the long run will improve public health. 

  • 46528.
    Ölvingson, Christina
    et al.
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Hallberg, Niklas
    Linköping University, Department of Computer and Information Science. Linköping University, The Institute of Technology.
    Timpka, Toomas
    Linköping University, Department of Department of Health and Society. Linköping University, Faculty of Health Sciences.
    Greenes, RA
    Adaptation of the critical incident technique to requirements engineering in public health2001In: Studies in Health Technology and Informatics, ISSN 0926-9630, Vol. 84, no 2, 1180-1184 p.Article in journal (Refereed)
    Abstract [en]

    The introduction of modern information systems in public health provides new possibilities for improvements in public health services and hence also of population's health. However, development of information systems that truly supports public health practices requires that technical, cognitive, and social issues be taken into consideration. In requirements engineering for public health, a notable problem is that of capturing all aspects of the future user's voices, i.e., the viewpoints of different public health practitioners. Failing to capture these voices will result in inefficient or even useless systems. The aim of this paper is to report a requirements-engineering instrument to describe problems in the daily work of public health professionals. The issues of concern thus captured can be used as the basis for formulating the requirements of information systems for public health professionals.

  • 46529.
    Öman, Anne
    et al.
    University of Gothenburg, Department of Applied IT.
    Sofkova Hashemi, Sylvana
    University West, Department of Social and Behavioural Studies, Division for Educational Science and Languages.
    Design and redesign of a multimodal classroom task: implications for teaching and learning2015In: Journal of Information Technology Education, ISSN 1547-9714, E-ISSN 1539-3585, Vol. 14, no 1, 139-159 p.Article in journal (Refereed)
    Abstract [en]

    Digital technologies are increasingly implemented in Swedish schools, which impact on education in the contemporary classroom. Screen-based practice opens up for new forms and multiplicity of representations, taking into account that language in a globalized society is more than reading and writing skills. This paper presents a case study of technology-mediated instruction at the primary-school level including an analysis of the designed task and how the teacher orchestrated the digital resources during three introductory classes. The aim was also to explore the pupils’ redesigning of advertising films based on teacher’s instructions and available digital resources. Sequences of a learning trajectory were video recorded and analysed from a multimodal perspective with a focus on the designed task and the processes of how pupils orchestrate meaning through their selection and configuration of available designs. The findings show a distinction between the selection of design elements in the teacher’s orchestration of the laptop resources during instruction and the pupils’ redesigning of the task. Pupils’ work developed from the linguistic design provided by the teacher towards visual design and the use of images as the central mode of expression in the process of creating advertising films. The findings also indicate a lack of orientation towards subject content due to the teacher’s primary focus on introducing the software.

  • 46530.
    Öman, Anne
    et al.
    University of Gothenburg, Department of Applied IT.
    Svensson, Lars
    University West, Department of Economics and IT, Divison of Informatics.
    Similar products different processes: Exploring the orchestration of digital resources in a primary school project2014In: Computers and education, ISSN 0360-1315, Vol. 81, 247-258 p.Article in journal (Refereed)
    Abstract [en]

    Today, teachers and pupils are interacting with digital devices during different types of activities in theclassroom context. During such activities, dialogic interaction has a particular value as a pedagogicalpractice that helps to develop pupils' understanding. This study has explored the question: In what waysdo digital resources support dialogic and synergistic interaction?In order to explore primary schoolpupils' interaction within group activity and how they make use of the features of the laptops, theempirical material was collected through video recordings and further analysed with the interactivityanalysis framework (IAF) developed by Beauchamp and Kennewell (2010). The findings show thatalthough the products produced by the different groups of pupils were similar in a technological way (i.e.the pupils used the same modes of expression), the patterns of interaction during the group processesvaried. Two out of six groups used the digital resource as an 'object of interaction', where the tool had amore passive role during the group collaboration. The other four groups used the ICT resource as a 'toolfor interaction', where the resource became more of an interaction partner during the meaning-makingprocesses, which opened up opportunities for learning. The findings also indicate that the interplay inthese four groups between the group members and the laptop features seems to have developed thepupils' understanding of ICT resources as well as their understanding of the subject content during thegroup work. Synergistic interaction with ICT was rather rare but was observed in one of the groups

  • 46531.
    Öman, Marcus
    KTH, School of Computer Science and Communication (CSC).
    Ramverk för sensorfusion.2012Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Using sensors in vehicles to be able to make the driving experience safer and automate the driving process is something that truck manufacturers has been interested in for years. In this thesis we explore the possibilities to make a framework for sensor fusion where developers develop plugins that gain access to data from multiple sensors. The result of this thesis is a suggestion for how to realize such a framework. We also discuss how to improve the quality of the framework and how to make it more stable.

  • 46532.
    Önal, Başar
    RISE, Swedish ICT, Interactive Institute.
    Designing for/from the Future2010Independent thesis Advanced level (degree of Master (Two Years))Student thesis
    Abstract [en]

    This thesis aims to introduce new methods within the field of experience design, an emergent interdisciplinary design discipline, using these methods as tools for debate and for the communication of new design concepts. An important part of the methods come from trendspotting practice and future studies methodology. The backbone of the final project is a “meta-method” which incorporates common methods surveyed so far: the “for/from” method. The first part of the “for/from” method is about designing prototypes and creating fictional narratives to project current trends into the future, the second part is perhaps less structured, but more ambitious, carrying fictional futures to the daily lives, to test and evaluate the scenarios created. Staging experiments and experiences around these proposed methodologies and testing the concepts through workshops forms the core of the proposed design practice. Since the domain of futures thinking is not populated by designers, it is of special importance to me as how designers might find a place in such interdisciplinary teams and how the organizational levels of these so-called complex experiential structures could allow designers to participate. I argue that experience designers not only design customer experiences to please and aestheticize products but they have the power to change people’s (rather than customers’) opinions, using the same tools the field of marketing and exhibition design offers them.

  • 46533.
    Önell, Annica
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Quantifying human balance: Analysis of force plate data1999Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    There is a lack of reliable methods for assessment of balance suited for routine use in clinical settings. The thesis focuses on analysis of force plate data for evaluation of balance during normal, unperturbed standing and sitting. Some commonly used force plate based methods during unperturbed standing are presented.

    Traditional measures, which have been used to quantify the postural sway during standing, were applied to seated children with and without spina bifida. Fundamental differences, that can not be observed visually, were found between the groups. However, the reliability on an individual level was limited since the method could not be used to distinguish between subjects from the two groups.

    It is not only of interest to measure how much the subject sways, but also what movement strategy the subject uses, that is, how he or she sways. A method for analysis of the movement strategy in the sagittal plane during standing is presented and tested. The subject's movements are compared to the movements of an inverted pendulum model. For movement analysis a kinematic measurement system is usually required, while the inverted pendulum method only needs force plate data for the analysis.

    To investigate the relationship between different force plate measures the measures were a) compared to each other and b) compared to a clinical balance test. Results on stroke patients showed that many of the measures quantify different aspects of standing. The standard deviation of the vertical ground reaction force was the only measure that was significantly correlated to the clinical balance test. Measurements on healthy adults and three groups of subjects with reduced or not fully developed balance were analysed to investigate the vertical force further. The healthy adults damped the vertical bodyoscillations caused by the heartbeats more efficiently than the other three groups.

    Finally, it was investigated under what conditions system identification can be used to model the balance system. In contrast to previous studies the model parameters were successfully estimated without any external perturbations and without a kinematic measurement system.

  • 46534.
    Önnberg, Fredrik
    University of Skövde, School of Humanities and Informatics.
    Software Configuration Management: A comparison of Chef, CFEngine and Puppet2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Configuring services in an ad-hoc way is less than optimal as human error can result in services that fail. Even though scripting offers a solution it does not allow for a uniform deployment of configurations. A possible solution to this problem is the use of software configuration management systems (SCMS) that allow administrators to specify what should be done, and not necessarily how. An implementation is conducted that focuses on the first part of implementing an SCMS to see if a transition to a SCMS governed environment can be worthwhile. Three SCMS will be investigated; Chef, CFEngine and Puppet. The results show that administrators can receive good support from the documentation as documentation of the three SCMS are mostly accurate. The support from the community is affected by region and activity is declining in some cases. Overall it is easy to install an SCMS and special purpose languages are effective for specifying functionality of services.

  • 46535.
    Öquist, Gustav
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Languages, Department of Linguistics and Philology.
    Assessing usability across multiple user interfaces2004In: Multiple User Interfaces: Cross-Platform Applications and Context-Aware Interfaces, 2004Chapter in book (Refereed)
  • 46536.
    Öquist, Gustav
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Languages, Department of Linguistics and Philology.
    Enabling Embodied Text Presentation on Mobile Devices2004In: Proceedings of Mobile and Ubiquitous Information Access 2004, 2004, 26-31 p.Conference paper (Refereed)
  • 46537.
    Öquist, Gustav
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Languages, Department of Linguistics and Philology.
    Multimodal Interaction with Mobile Devices: Outline of a Semiotic Framework for Theory and Practice2006In: Proceedings of Wireless Networks and Systems 2006, 2006Conference paper (Refereed)
    Abstract [en]

    This paper explores how interfaces that fully uses our ability to communicate through the visual, auditory, and tactile senses, may enhance mobile interaction. The first step is to look beyond the desktop. We do not need to reinvent computing, but we need to see that mobile interaction does not benefit from desktop metaphors alone. The next step is to look at what we have at hand, and as we will see, mobile devices are already quite apt for multimodal interaction. The question is how we can coordinate information communicated through several senses in a way that enhances interaction. By mapping information over communication circuit, semiotic representation, and sense applied for interaction; a framework for multimodal interaction is outlined that can offer some guidance to integration. By exemplifying how a wide range of research prototypes fit into the framework today, it is shown how interfaces communicating through several modalities may enhance mobile interaction tomorrow.

  • 46538.
    Öquist, Gustav
    et al.
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Languages, Department of Linguistics and Philology.
    Goldstein, Mikael
    Towards an improved readability on mobile devices: Evaluating Adaptive Rapid Serial Visual Presentation2002In: Proceedings of Mobile HCI 2002, 2002Conference paper (Refereed)
  • 46539.
    Öquist, Gustav
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Languages, Department of Linguistics and Philology.
    Goldstein, Mikael
    Towards an improved readability on mobile devices: evaluating adaptive rapid serial visual presentation2003In: Interacting with computers, ISSN 0953-5438, Vol. 15, no 1, 539-558 p.Article in journal (Refereed)
    Abstract [en]

    Can readability on small screens be improved by using adaptive Rapid Serial Visual Presentation (RSVP) that adapts the presentation speed to the characteristics of the text instead of keeping it fixed? In this paper we introduce Adaptive RSVP, describe the design of a prototype on a mobile device, and report findings from a usability evaluation where the ability to read long and short texts was assessed. In a latin-square balanced repeated-measurement experiment, employing 16 subjects, two variants of Adaptive RSVP were benchmarked against Fixed RSVP and traditional text presentation. For short texts, all RSVP formats increased reading speed by 33% with no significant differences in comprehension or task load. For long texts, no differences were found in reading speed or comprehension, but all RSVP formats increased task load significantly. Nevertheless, Adaptive RSVP decreased task load ratings for most factors compared to Fixed RSVP. Causes, implications, and effects of these findings are discussed.

  • 46540.
    Öquist, Gustav
    et al.
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Languages, Department of Linguistics and Philology.
    Goldstein, Mikael
    Björk, Staffan
    Utilizing gaze detection to stimulate the affordances of paper in the Rapid Serial Visual Presentation Format2002In: Proceedings of Mobile HCI 2002, 2002, 378-381 p.Conference paper (Refereed)
  • 46541.
    Öquist, Gustav
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Languages, Department of Linguistics and Philology.
    Sågvall Hein, Anna
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Languages, Department of Linguistics and Philology.
    Ygge, Jan
    Goldstein, Mikael
    Eye movemement study of reading text on a mobile device using the traditional page and the dynamic RSVP format.2004In: Proceedings of Mobile HCI 2004, 2004, 108-119 p.Conference paper (Refereed)
  • 46542.
    Örblom, Markus
    KTH, School of Information and Communication Technology (ICT).
    Effects of Network Performance on Smartphone User Behavior2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    While the relation between smartphone user behavior and contextual factors have been explored in previous research, the mobile networks’ influence on the smartphone user behavior is largely unknown. Through statistical analysis of a data set collected globally from ˜ 1000 users by an Android app called Ericsson Apps, this study investigates how the users’ app choices and app usage depend on the network performance.

    The results show, for instance, that the choice of app depends strongly on the network performance, suggesting that it is a factor in the users’ app choices. For example, Swedish users are ˜ 3 times more likely to use Facebook on LTE than when disconnected, i.e., no access to the mobile networks, while ˜ 4.6 times more likely to make a phone call when disconnectedthan on LTE. Additionally, the data analysis finds a demand for better performance in the mobile networks as the downlink data consumption grows linearly without decline, with respect to network performance, for media and video types of apps.

  • 46543.
    Örlü, Ramis
    et al.
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.
    Alfredsson, Henrik
    KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics.
    The life of a vortex in an axisymmetric jet2011In: Journal of Visualization, ISSN 1343-8875, E-ISSN 1875-8975, Vol. 14, no 1, 5-6 p.Article in journal (Refereed)
    Abstract [en]

    An axisymmetric jet is produced whenever a fluid is ejected from a round nozzle. The internal and external disturbances present in and surrounding the jet will trigger the formation of Kelvin–Helmoltz waves that are amplified and grow until they saturate and roll up in discrete vortices undergoing different processes such as (vortex) pairing and tearing until they collapse generating a complete turbulent flow. Concerning the evolution of the vortices within the axisymmetric shear layer, a typical scenario, describing the stages in a life of a vortex, is well represented by the flow visualization sequences shown in Fig. 1 as well as the movie in Online Resource 1.

  • 46544.
    Örnberg, Dennis
    Linköping University, Department of Computer and Information Science, Database and information techniques.
    Comparison and implementation of graph visualization algorithms using JavaFX2016Independent thesis Basic level (university diploma), 10,5 credits / 16 HE creditsStudent thesis
    Abstract [en]

    Graph drawing is an important area in computer science and it has many different application areas. For example, graphs can be used to visualize structures like networks and databases. When the graphs are really big, however, it becomes difficult to draw them so that the user can get a good overview of the whole graph and all of its data. There exist a number of different algorithms that can be used to draw graphs, but they have a lot of differences. The goal of this report was to find an algorithm that produces graphs of satisfying quality in little time for the purpose of ontology engineering, and implement it using a platform that visualizes the graph using JavaFX. It is supposed to work on a visualization table with a touch display. A list of criteria for both the algorithm and the application was made to ensure that the final result would be satisfactory. A comparison between four well-known graph visualization algorithms was made and “GEM” was found to be the best suited algorithm for visualizing big graphs. The two platforms Gephi and Prefux were introduced and compared to each other, and the decision was made to implement the algorithm in Prefux since it has support for JavaFX. The algorithm was implemented and evaluated, it was found to produce visually pleasing graphs within a reasonable time frame. A modified version of the algorithm called GEM-2 was also introduced, implemented and evaluated. With GEM-2, the user can pick a specific number of levels to be expanded at first, additional levels can then be expanded by hand. This greatly improves the performance when there is no need to expand the whole graph at once, however, it also increases the amount of edge crossings which makes the graph less visually pleasing.

  • 46545.
    Örnfjärd, John
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information and Communication systems.
    Schemaläggning på webben: Ett planeringsverktyg2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Through modern technology, scheduling and displaying these schedules has moved from its static paper form, to computerized form through development of dynamic scheduling tools. These tools can cover a variety of different uses but generally share one purpose; To plan future events. Since scheduling on a digital platform often allows the user to plan more events in less time, this has become a common form of scheduling. Although tools are available, it does not mean this kind of scheduling is flawless. You may experience problems when employees work irregular shifts and/or hours, need work related courses and go on vacations. In this scenario the scheduling tool need to show if the resources allotted a given time period is sufficient to reach maximum efficiency that day. This thesis aims to help IF Sundsvall with scheduling and the visualization of the qualifications of those currently working. This was done using a prototype that acts as a planning tool. This planning tool is meant to give IF Sundsvall the information they need in order to plan properly and thereby improve the contact with customers. The tool has undergone a usability test which results were ana- lyzed on a qualitative and quantitative level. A comparison has also been carried out comparing the previous scheduling tool and the prototype. The results of the usability test show that scheduling and the visualization of this scheduling with the prototype is possible without previous knowledge. The prototype developed in this project did however not reach the projects set goal.

  • 46546.
    Örtegren, Kevin
    Blekinge Institute of Technology, Faculty of Computing, Department of Creative Technologies.
    Clustered Shading: Assigning arbitrarily shaped convex light volumes using conservative rasterization2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Context. In this thesis, a GPU-based light culling technique performed with conservative rasterization is presented. Accurate lighting calculations are expensive in real-time applications and the number of lights used in a typical virtual scene increases as real-time applications become more advanced. Performing light culling prior to shading a scene has in recent years become a vital part of any high-end rendering pipeline. Existing light culling techniques suffer from a variety of problems which clustered shading tries to address.

    Objectives. The main goal of this thesis is to explore the use of the rasterizer to efficiently assign convex light shapes to clusters. Being able to accurately represent and assign light volumes to clusters is a key objective in this thesis.

    Methods. This method is designed for real-time applications that use large amounts of dynamic and arbitrarily shaped convex lights. By using using conservative rasterization to assign convex light volumes to a 3D cluster structure, a more suitable light volume approximation can be used. This thesis implements a novel light culling technique in DirectX 12 by taking advantage of the hardware conservative rasterization provided by the latest consumer grade Nvidia GPUs. Experiments are conducted to prove the efficiency of the implementation and comparisons with AMD´s Forward+ tiled light culling are provided to relate the implementation to existing techniques.

    Results. The results from analyzing the algorithm shows that most problems with existing light culling techniques are addressed and the light assignment is of high quality and allows for easy integration of new convex light types. Assigning the lights and shading the CryTek Sponza scene with 2000 point lights and 2000 spot lights takes 2.92ms on a GTX970.

    Conclusions. The conclusion shows that the main goal of the thesis has been reached to the extent that all existing problems with current light culling techniques have been solved, at the cost of using more memory. The technique is novel and a lot of future work is outlined and would benefit the validity of the implementation if further researched.

  • 46547.
    Örtenberg, Alexander
    et al.
    Linköping University, Department of Medical and Health Sciences, Division of Radiological Sciences. Linköping University, Center for Medical Image Science and Visualization (CMIV). Linköping University, Faculty of Medicine and Health Sciences.
    Magnusson, Maria
    Linköping University, Department of Electrical Engineering, Computer Vision. Linköping University, Department of Medical and Health Sciences, Division of Radiological Sciences. Linköping University, Center for Medical Image Science and Visualization (CMIV). Linköping University, Faculty of Science & Engineering. Linköping University, Faculty of Medicine and Health Sciences.
    Sandborg, Michael
    Linköping University, Center for Medical Image Science and Visualization (CMIV). Linköping University, Department of Medical and Health Sciences, Division of Radiological Sciences. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center for Surgery, Orthopaedics and Cancer Treatment, Department of Radiation Physics.
    Alm Carlsson, Gudrun
    Linköping University, Center for Medical Image Science and Visualization (CMIV). Linköping University, Department of Medical and Health Sciences, Division of Radiological Sciences. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Center for Surgery, Orthopaedics and Cancer Treatment, Department of Radiation Physics.
    Malusek, Alexandr
    Linköping University, Center for Medical Image Science and Visualization (CMIV). Linköping University, Department of Medical and Health Sciences, Division of Radiological Sciences. Linköping University, Faculty of Medicine and Health Sciences.
    PARALLELISATION OF THE MODEL-BASED ITERATIVE RECONSTRUCTION ALGORITHM DIRA2016In: Radiation Protection Dosimetry, ISSN 0144-8420, E-ISSN 1742-3406, Vol. 169, no 1-4, 405-409 p.Article in journal (Refereed)
    Abstract [en]

    New paradigms for parallel programming have been devised to simplify software development on multi-core processors and many-core graphical processing units (GPU). Despite their obvious benefits, the parallelisation of existing computer programs is not an easy task. In this work, the use of the Open Multiprocessing (OpenMP) and Open Computing Language (OpenCL) frameworks is considered for the parallelisation of the model-based iterative reconstruction algorithm DIRA with the aim to significantly shorten the code’s execution time. Selected routines were parallelised using OpenMP and OpenCL libraries; some routines were converted from MATLAB to C and optimised. Parallelisation of the code with the OpenMP was easy and resulted in an overall speedup of 15 on a 16-core computer. Parallelisation with OpenCL was more difficult owing to differences between the central processing unit and GPU architectures. The resulting speedup was substantially lower than the theoretical peak performance of the GPU; the cause was explained.

  • 46548.
    Örtqvist, Daniel
    et al.
    Beowulf.
    Liljedahl, Mats
    RISE, Swedish ICT, Interactive Institute. Sonic Studio.
    Immersion and Gameplay Experience: A Contingency Framework2010In: International Journal of Computer Games Technology, Vol. 2010Article in journal (Refereed)
    Abstract [en]

    The nature of the relationship between immersion and gameplay experience is investigated, focusing primarily on the literature related to flow. In particular, this paper proposes that immersion and gameplay experience are conceptually different, but empirically positively related through mechanisms related to flow. Furthermore, this study examines gamers' characteristics to determine the influence between immersion and gameplay experiences. The study involves 48 observations in one game setting. Regression analyses including tests for moderation and simple slope analysis are used to reveal gamers' age, experience, and understanding of the game, which moderate the relationship between immersion and gameplay experience. The results suggest that immersion is more positive for gameplay experience when the gamer lacks experience and understanding of the game as well as when the gamer is relatively older. Implications and recommendations for future research are discussed at length in the paper.

  • 46549.
    Öst, Gustav
    Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
    Search path generation with UAV applications using approximate convex decomposition2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This work focuses on the problem that pertains to area searching with UAVs. Specifically developing algorithms that generate flight paths that are short with- out sacrificing flyability. For instance, very sharp turns will compromise flyability since fixed wing aircraft cannot make very sharp turns. This thesis provides an analysis of different types of search methods, area decompositions, and combi- nations thereof. The search methods used are side to side searching and spiral searching. In side to side searching the aircraft goes back and forth only making 90-degree turns. Spiral search searches the shape in a spiral pattern starting on the outer perimeter working its way in. The idea being that it should generate flight paths that are easy to fly since all turns should be with a large turn radii. Area decomposition is done to divide complex shapes into smaller more manage- able shapes. The report concludes that with the implemented methods the side to side scanning method without area decomposition yields good and above all very reliable results. The reliability stems from the fact that all turns are 90 degrees and that algorithm never get stuck or makes bad mistakes. Only having 90 degree turns results in only four different types of turns. This allows the airplanes behav- ior along the route to be predictable after flying the first four turns. Although this assumes that the strength of the wind is a greater influence than the turbulences effect on the aircraft’s flight characteristics. This is a very valuable feature for an operator in charge of a flight. The other tested methods and area decompositions often yield a shorter flight path, however, despite extensive adjustments to the algorithms they never came to handle all cases in a satisfactory manner. These methods may also generate any kind of turn at any time, including turns of nearly 180 degrees. These turns can lead to an airplane missing the intended flight path and thus missing to scan the intended area properly. Area decomposition proves to be really effective only when the area has many protrusions that stick out in different directions, think of a starfish shape. In these cases the side to side algo- rithm generate a path that has long legs over parts that are not in the search area. When the area is decomposed the algorithm starts with, for example, one arm of the starfish at a time and then search the rest of the arms and body in turn. 

  • 46550.
    Östansjö, Patrik
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Utveckling av nytt Radiofarmakaregister i Java2012Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Avdelningen Nuklearmedicin på Gävle sjukhus har problem med att deras befintliga ”Radiofarmakaregister” inte fungerar på Windows 7, som de håller på att uppgradera till. Därför har Gävle sjukhus utlyst ett examensarbete med syftet att lösa problemet med att programmet inte fungerar på Windows 7. Det här projektet gick ut på att utveckla ett nytt program från grunden med de krav sjukhuset ställde. Det nya programmet utvecklades i programmeringsspråket Java. Vid projektets slut uppfylldes de krav som ställdes på projektet

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