Change search
Refine search result
928929930931932933934 46501 - 46550 of 49380
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the 'Create feeds' function.
  • 46501.
    Weinkauf, Tino
    et al.
    Zuse Institute Berlin (ZIB), Berlin, Germany.
    Theisel, H.
    Hege, H. -C
    Seidel, H. -P
    Topological Structures in Two-Parameter-Dependent 2D Vector Fields2006In: Computer graphics forum (Print), ISSN 0167-7055, E-ISSN 1467-8659, Vol. 25, no 3, p. 607-616Article in journal (Refereed)
    Abstract [en]

    In this paper we extract and visualize the topological skeleton of two-parameter-dependent vector fields. This kind of vector data depends on two parameter dimensions, for instance physical time and a scale parameter. We show that two important classes of local bifurcations – fold and Hopf bifurcations – build line structures for which we present an approach to extract them. Furthermore we show that new kinds of structurally stable local bifurcations exist for this data, namely fold-fold and Hopf-fold bifurcations. We present a complete classification of them. We apply our topological extraction method to analyze a number of two-parameter-dependent vector fields with different physical interpretations of the two additional dimensions.

  • 46502.
    Weinkauf, Tino
    et al.
    Zuse Institute Berlin.
    Theisel, H.
    Shi, K.
    Hege, H. -C
    Seidel, H. -P
    Extracting Higher Order Critical Points and Topological Simplification of 3D Vector Fields2005In: Proc. IEEE Visualization 2005, 2005, p. 559-566Conference paper (Refereed)
    Abstract [en]

    This paper presents an approach to extracting and classifying higher order critical points of 3D vector fields. To do so, we place a closed convex surface s around the area of interest. Then we show that the complete 3D classification of a critical point into areas of similar flow behavior is equivalent to extracting the topological skeleton of an appropriate 2D vector field on s, if each critical point is equipped with an additional Bit of information. Out of this skeleton, we create an icon which replaces the complete topological structure inside s for the visualization. We apply our method to find a simplified visual representation of clusters of critical points, leading to expressive visualizations of topologically complex 3D vector fields.

  • 46503.
    Weinkauf, Tino
    et al.
    Courant Institute, New York University.
    Theisel, H.
    Sorkine, O.
    Cusps of Characteristic Curves and Intersection-Aware Visualization of Path and Streak Lines2012In: Topological Methods in Data Analysis and Visualization II / [ed] Peikert, R.; Hauser, H.; Carr, H.; Fuchs, R., Springer , 2012, p. 161-176Chapter in book (Other academic)
    Abstract [en]

    We analyze characteristic curves of vector fields and report on locations where they have cusps in their spatial projection, i.e., isolated points on the curve with abruptly turning tangent direction. Cusps appear in places where a projection of the corresponding tangent curve vector field exhibits critical points. We show that such cusps are only possible for streak and path lines, whereas they cannot appear on stream and time lines. Cusps turn out to be closely related to self-intersections of characteristic curves. We utilize this information in a new algorithm to create uncluttered static visualizations of path and streak lines.

  • 46504.
    Weinmann, Hannes
    Linnaeus University, Faculty of Technology, Department of Informatics.
    In-Vehicle Information Systems: An Investigation of Dependencies in the Driver-Vehicle-Environment (DVE) System – an On-Road Study2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study explores how In-Vehicle Information Systems (IVIS) can influence people´s driving behavior in the real environment. In particular, this thesis investigates important parameters and variables in the so called Driver-Vehicle-Environment (DVE) system. Most of the current knowledge regarding driver distraction is based on simulator studies, since simulators are highly controllable and cost efficient. As a result, the environmental component in the DVE system is not sufficiently addressed. This is a concern, since driving behavior is a combination of influences from both, the information system in the vehicle and the environment. My study, however, aimed to explain phenomena regarding driver distraction in their overall context. This was achieved in two steps. First, important parameters and variables with respect to the three system-elements (Driver, Vehicle, and Environment) were identified from the literature and summarized in a “Big Picture” (extended/substantiated DVE system). Second, after parameters and variables were identified, they were tested/varied in the frame of an onroad experiment. After completing these two steps, the data from the field was analyzed in the context of the extended/substantiated DVE system. I expect this study to have an impact on current knowledge, since it substantiates and contextualizes parameters and variables in the DVE system. Furthermore, my proposed framework, at the end of this thesis, is relevant for a variety of stakeholders, since it illustrates dependencies in an overall- and real life context.

  • 46505.
    Weishaupt, Holger
    et al.
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics. Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden.
    Johansson, Patrik
    Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden.
    Engström, Christopher
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Nelander, Sven
    Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden.
    Silvestrov, Sergei
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Swartling, Fredrik
    Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Sweden.
    Graph Centrality Based Prediction of Cancer Genes2016In: Engineering Mathematics II: Algebraic, Stochastic and Analysis Structures for Networks, Data Classification and Optimization / [ed] Sergei Silvestrov; Milica Rancic, Springer, 2016, p. 275-311Chapter in book (Refereed)
    Abstract [en]

    Current cancer therapies including surgery, radiotherapy and chemotherapy are often plagued by high failure rates. Designing more targeted and personalized treatment strategies requires a detailed understanding of druggable tumor drivergenes. As a consequence, the detection of cancer driver genes has evolved to a critical scientific field integrating both high-through put experimental screens as well as computational and statistical strategies. Among such approaches, network based prediction tools have recently been accentuated and received major focus due to their potential to model various aspects of the role of cancer genes in a biological system. In this chapter, we focus on how graph centralities obtained from biological networks have been used to predict cancer genes. Specifically, we start by discussing the current problems in cancer therapy and the reasoning behind using network based cancer gene prediction, followed by an outline of biological networks, their generation and properties. Finally, we review major concepts, recent results as well as future challenges regarding the use of graph centralities in cancer gene prediction.

  • 46506.
    Weishaupt, Holger
    et al.
    Uppsala University, Sweden.
    Johansson, Patrik
    Uppsala University, Sweden.
    Engström, Christopher
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Nelander, Sven
    Uppsala University, Sweden.
    Silvestrov, Sergei
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Swartling, Fredrik
    Uppsala University, Sweden.
    Loss of Conservation of Graph Centralities in Reverse-engineered Transcriptional Regulatory Networks2017In: Methodology and Computing in Applied Probability, ISSN 1387-5841, E-ISSN 1573-7713, ISSN 1387-5841, Vol. 19, no 4, p. 1095-1105Article in journal (Refereed)
    Abstract [en]

    Graph centralities are commonly used to identify and prioritize disease genes in transcriptional regulatory networks. Studies on small networks of experimentally validated protein-protein interactions underpin the general validity of this approach and extensions of such findings have recently been proposed for networks inferred from gene expression data. However, it is largely unknown how well gene centralities are preserved between the underlying biological interactions and the networks inferred from gene expression data. Specifically, while previous studies have evaluated the performance of inference methods on synthetic gene expression, it has not been established how the choice of inference method affects individual centralities in the network. Here, we compare two gene centrality measures between reference networks and networks inferred from corresponding simulated gene expression data, using a number of commonly used network inference methods. The results indicate that the centrality of genes is only moderately conserved for all of the inference methods used. In conclusion, caution should be exercised when inspecting centralities in reverse-engineered networks and further work will be required to establish the use of such networks for prioritizing disease genes.

  • 46507.
    Weishaupt, Holger
    et al.
    Uppsala University, Sweden.
    Johansson, Patrik
    Engström, Christopher
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Nelander, Sven
    Silvestrov, Sergei
    Mälardalen University, School of Education, Culture and Communication, Educational Sciences and Mathematics.
    Swartling, Fredrik J.
    Prediction of high centrality nodes from reverse-engineered transcriptional regulator networks2016In: Proocedings of the 4th Stochastic Modeling Techniques and Data Analysis International Conference with Demographics Workshop / [ed] Christos H Skiadas, 2016, p. 517-531Conference paper (Refereed)
    Abstract [en]

    The prioritization of genes based on their centrality in biological networkshas emerged as a promising technique for the prediction of phenotype related genes.A number of methods have been developed to derive one such type of network, i.e.transcriptional regulatory networks, from expression data. In order to reliably prioritizegenes from such networks, it is crucial to investigate how well the inferencemethods reconstruct the centralities that exist in the true biological system. We haverecently reported that the correlation of centrality rankings between reference andinferred networks is only modest when using an unbiased inference approach. In thisstudy we extend on these results and demonstrate that the correlation remains modestalso when using a biased inference utilizing a priori information about transcriptionfactors. However, we show further that despite this lack of a strong correlation, theinferred networks still allow a signicant prediction of genes with high centralities inthe reference networks.

  • 46508.
    Weiss, Jan
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Speed-invariant video comparison for robust human action recognition2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As cameras and especially 3D cameras got affordable within recent years they can be used by a wider range of people. Human action recognition based on 3D coordinates recorded with such devices including a depth camera made it possible to compute video data easier. Many already published papers ignore the difference of speed within the execution of the same action. This paper suggests and evaluates multiple algorithms handling that problem based on Dynamic Time Warping and compares them with regard to runtime and accuracy. An additional algorithm from Softwerk AB is analyzed, adjusted and compared. An approach for a fast and robust algorithm able to compute a massive amount of stored sequences is proposed within this paper. The new algorithm depends on further research as not all prerequisites are met yet.

  • 46509.
    Weiss, Marc
    et al.
    NIST.
    Eidson, John
    University of California, Berkeley.
    Barry, Charles
    Jolata Inc..
    Broman, David
    KTH, School of Information and Communication Technology (ICT), Software and Computer systems, SCS. UC Berkeley, USA.
    Goldin, Leon
    IDT Inc..
    Iannucci, Bob
    Carnegie Mellon University, Silicon Valley Campus.
    Stanton, Kevin
    Intel Corporation.
    Time-Aware Applications, Computers, and Communication Systems (TAACCS)2015Report (Other academic)
    Abstract [en]

    A new economy built on the massive growth of endpoints on the internet will require precise and verifiable timing in ways that current systems do not support. Applications, computers, and communications systems have been developed with modules and layers that optimize data processing but degrade accurate timing. State-of-the-art systems now use timing only as a performance metric. Correctness of timing as a metric cannot currently be designed into systems independent of hardware and/or software implementations. To enable the massive growth predicted, accurate timing needs cross-disciplinary research to be integrated into these existing systems. This paper reviews the state of the art in six crucial areas central to the use of timing signals in these systems. Each area is shown to have critical issues requiring accuracy or integrity levels of timing, that need research contributions from a range of disciplines to solve. 

  • 46510.
    Weistrand, Ola
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics. Interfaculty Units, Centre for Image Analysis. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Mathematics, Mathematics I -V.
    Shape approximation of discrete starshaped objects2006In: Pattern Recognition Letters, Vol. 27, no 16, p. 1934-1941Article in journal (Refereed)
  • 46511. Weitl, Franz
    et al.
    Sebih, Nazim
    Artho, Cyrille
    Hagiya, Masami
    Tanabe, Yoshinori
    Yamagata, Yoriyuki
    Yamamoto, Mitsuharu
    Cardinality of UDP Transmission Outcomes2015In: Proc. Dependable Software Engineering: Theories, Tools, and Applications — First International Symposium, SETTA 2015, Springer, 2015, Vol. 9409, p. 120-134Conference paper (Refereed)
    Abstract [en]

    This paper examines the cost of testing network applications using the User Datagram Protocol (UDP). Such applications must deal with packet loss, duplication, and reordering. Ideally, a UDP application should be tested against all possible outcomes of unreliable UDP transmissions. Their number, however, grows at least exponentially in the number of transmitted packets. To estimate the cost of the exhaustive testing of UDP applications, we determine the number of UDP transmission outcomes analytically. Based on this combinatorial analysis, we derive a sound, complete, and optimal algorithm for generating outcomes of unreliable UDP transmissions. The algorithm is implemented in the net-iocache extension of the software model checker Java Pathfinder (JPF). Experimental results confirm the consistency of the implementation with the analytical results. In addition, we found that JPF's state matching reduces the explored state space significantly and ensures the practicability of the approach despite of its exponential complexity.

  • 46512.
    Weißbach, Mandy
    et al.
    University of Halle, Germany.
    Zimmermann, Wolf
    University of Halle, Germany.
    Löwe, Welf
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Context-aware Data-flow in the Cloud2013In: Cloud Computing 2013 : The Fourth International Conference on Cloud Computing, GRIDs, and Virtualization, 2013, p. 81-86Conference paper (Refereed)
    Abstract [en]

    In the last few months, clients of services running in a cloud are getting more and more aware of storing and processing their data in the cloud. In this paper, we present a context-aware data-flow analysis approach to allow clients to negotiate services that store or process (directly or indirectly) their data in undesired locations. The approach is context- aware to satisfy the stateless character of services in a multi- tenant cloud. We show that the use of a dynamic context-aware data-flow analysis ensures that the clients’ data does not reach undesired locations in the cloud.

  • 46513.
    Wejnermark, Daniel
    et al.
    University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
    Johansson, Jimmy
    University West, Department of Engineering Science, Division of Computer and Electrical Engineering.
    Hybrid med Frame Relay & MPLS2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In 1989 the purpose of internet developed and the uses expanded [10]. Frame Relay was already in the 80's but was used as in the telecommunications industry. It was later developed substantially and started in the 90's standardized for computer communications [1,2]. Multiprotocol Label Switching (MPLS) began to develop in 1997, but was completed in the early 2000’s [4]. These two protocols are based on the same technology in which data packets are switched instead of routed.

    The report addresses three scenarios that are entirely possible problems that could occur in institutional networks. To solve these problems, measurements and tests are used to determine differences between the protocols. The protocols are compared not only in performance but also technically in order to decide what protocol and implementation that work best. Based on the results of the project, the best solution will be found and later implemented for each scenario and are presented in the discussion part.

  • 46514.
    Wejsflog, Mikael
    Blekinge Institute of Technology, School of Technoculture, Humanities and Planning.
    MyMusic – e-shop för musik i Flash2006Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    Jag hade en idé om att skapa en e-shop med fokus på användarvänlighet och interaktivitet. Detta ledde till en klient/server-applikation med funktioner för att lyssna på musik och söka efter- och ta del av musikinformation. Syftet var att ge användare möjlighet att köpa musik i form av nedladdningsbara MP3-filer. Applikationen är huvudsakligen indelad i tre sektioner, en meny överst; en musikspelare placerad på vänster sida; och en s.k. content-del, ett slags fönster där all text och bildbaserat innehåll presenteras. Gränssnittets utformning är rent och enkelt med tydliga knappar och menyer för enkel navigation. Musik kan förhandslyssnas, och spelas upp med hjälp av en inbyggd musikspelare. Tanken är att ljudet ska kunna spelas upp i realtid från servern, dvs. strömmas. Detta medför att data inte lagras hos klienten och syftet är alltså att användaren ska kunna förhandslyssna på den musik han eller hon är intresserad av att köpa, men till sämre ljudkvalitet än den köpta MP3-filen. En display visar artistens eller gruppens namn, låtnamn, spelad tid, och total tid. Vidare finns knappar för att spela upp, stoppa, pausa och spela nästa respektive föregående låt. Slutligen finns ett reglage för att kunna styra spelposition. Som ett led i att förenkla köp av musik kan en spellista fyllas med valda låtar. Låtarna i denna lista kan man sedan köpa i ett svep eller var för sig. Detta innebär att användaren slipper leta upp en låt i taget, och lyssna på dem vart efter varandra. Ett webbformulär byggdes för att kunna tillhandahålla uppladdning och lagring av musikfiler och musikinformation. Webbformuläret är byggt i teknikerna HTML, CSS, PHP och JavaScript. Den innehåller en dynamiskt genererad tabell för att underlätta insättning av låtar. Webbformuläret kan med fördel utnyttjas av godkända parter (skivbolag, artister…), för att ladda upp och lagra musikfiler på servern. Detta resulterar i en arbetsbesparande process eftersom arbetsbördan fördelas till extern part. All musikinformation, så som artistnamn, låtnamn, utgivningsdatum, etc. lagras och hämtas från en MySQL-databas. Musikfiler lagras och spelas upp från filsystemet i en Apache HTTP Server. Applikationen utgörs av flera skikt. Det innebär att den är uppdelad i flera separata delar. En del består av gränssnittet, en SWF-fil som användaren kommer åt genom sin webbläsare. Gränssnittet opererar gentemot data som ligger lagrat på en webbserver. Vidare finns speciell programkod på servern för att ta emot-, skicka respektive manipulera data. Två typer av datalager används för att möjliggöra kommunikation av data mellan Flashklient (gränssnitt) och server – Flash Remoting och AMFPHP. Flash Remoting är ett slags kommunikationsprotokoll som Flashklienten använder för att kommunicera med server. AMFPHP används för att ”tolka” Flashkod som sänds via HTTP till server. AMFPHP omvandlar denna till, för servern, läsbar server-sidekod – PHP, som i sin tur kan manipulera data på servern, t.ex. lagra data i databasen. När data skickas till Flashklienten, omvandlar AMFPHP data till, för Flashfilen, läsbar kod. En stor del av projektet har varit av undersökande natur. Målet var att erhålla tekniska kunskaper i Flashmiljön för att kunna utveckla interaktiva webbapplikationer. Kunskap har inhämtats via litteratur i bokform, det inbyggda hjälpbiblioteket i Adobe Flash 8 Professional mjukvara, samt från internet, bland en mängd olika forum och webbsidor. Utvecklingsarbetet har bestått av en kombination av rörlig utveckling och extrem programmering.

  • 46515.
    WEJÉUS, SAMUEL
    KTH, School of Computer Science and Communication (CSC).
    A Neural Network Approach to Arbitrary SymbolRecognition on Modern Smartphones2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Making a computer understand handwritten text and symbols have numerous applications ranging from reading of bank checks, mail addresses or digitalizing arbitrary note taking. Benefits include atomization of processes, efficient electronic storage, and possible augmented usage of parsed content. This report will provide an overview of how off-line handwriting recognition systems can be constructed. We will show how such systems can be split into isolated modules which can be constructed individually. Focus will be on handwritten single symbol recognition and we will present how this could be accomplished using convolutional neural networks on a modern smartphone. A symbol recognition prototype application for the Apple iOS operation system will be constructed and evaluated as a proof-of-concept. Results obtained during this project shows that it is possible to train a classifier to understand arbitrary symbols without the need to manually crafting class separating features and instead rely on deep learning for automatic structure discovery.

  • 46516.
    Wejéus, Samuel
    KTH, School of Computer Science and Communication (CSC).
    Autentisering av klient genom Proof-of-work och Challenge-response.2011Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This essay will analyze the basics of two techniques called Proof-of-work and Challenge-response with the purpose to see how the combination of these could be used to create a authentication protocol that can ensure both the identity and intention of a client. I will examine whether, and if so how, this new protocol can prevent Brute-force and Denial-of-service attacks by taking advantage of key security features of Proof-of-work Challenge-response respectively.

    A realization of the protocol will be presented, both theoretically as well as in the form of a implementation in created as a client/server model. An analysis of the proposed protocol will be provided, which will show how the combination of Proof-of-work and Challenge-response can provide some security benefits but also creates new flaws that ultimately makes the protocol unsuitable for practical use in its present form.

  • 46517.
    Weldezion, Awet Yemane
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Lu, Zhonghai
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Weerasekera, Roshan
    Tenhunen, Hannu
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    3-D Memory Organization and Performance Analysis for Multi-processor Network-On-Chip Architecture2009In: 2009 IEEE INTERNATIONAL CONFERENCE ON 3D SYSTEMS INTEGRATION, NEW YORK: IEEE , 2009, p. 42-48Conference paper (Refereed)
    Abstract [en]

    Several forms of processor memory organizations have been in use to optimally access off-chip memory systems mainly the Hard disk drives (HDD). Recent trends show that the solid state drives - (SSD) such as flash memories replacing HDDs and multi-processor memory system realized in a single 3-D structure with network-on-chip (NOC) architecture as a communication medium. This paper discusses high level memory organization and architectural modeling and simulation based on 3-D NOC. A comparative analysis among several models including Dance-hall, Sandwich, Terminal, Per-layer and mixed architectures is done. Simulations in cycle accurate 3-D NOC VHDL model are done to evaluate the performance each architecture in uniform and local traffic patterns.

  • 46518.
    Welin-Berger, Robert
    et al.
    KTH, School of Computer Science and Communication (CSC).
    Bäckström, Anton
    KTH, School of Computer Science and Communication (CSC).
    Optimizing Strassen's multiplication algorithm for modern processors: A study in optimizing matrix multiplications for large matrices on modern CPUs2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This paper examines how to write code to gain high performance on modern computers as well as the importance of well planned data structures. The experiments were run on a computer with an Intel i5-5200U CPU, 8GB of RAM running Linux Mint 17.For the measurements Winograd's variant of Strassen's matrix multiplication algorithm was implemented and eventually compared to Intel's math kernel library (MKL). A quadtree data structure was implemented to ensure good cache locality. Loop unrolling and tiling was combined to improve cache performance on both L1 and L2 cache taking into regard the out of order behavior of modern CPUs. Compiler hints were partially used but a large part of the time critical code was written in pure assembler. Measurements of the speed performance of both floats and doubles were performed and substantial differences in running times were found.While there was a substantial difference between the best implementation and MKL for both doubles and floats at smaller sizes, a difference of only 1\% in execution time was achieved for floats at the size of 2^14. This was achieved without any specific tuning and could be expected to be improved if more time was spent on the implementation.

  • 46519.
    Welle, Michael C.
    KTH, School of Computer Science and Communication (CSC), Robotics, perception and learning, RPL.
    View Planning for Objects Modeling using UAVs2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    View planning is an important part of achieving full robotic autonomy. The ability to incorporate the view of a robot as well as the ability of evaluating and choosing the best view are highly desired abilities for a wide variety of robotics applications. In this work we present a new iterative optimization scheme and evaluational method in order to choose the Next Best View in the framework of object modeling. As unmanned aerial vehicles (UAVs) become more and more common we take advantage of the additional degrees of freedom a UAV offers. We show, in simulation, that the proposed method is able to pick out views that are highly relevant in order to model the observed object in question. It is shown that with iterative optimization the resulting view is improved. Additional experiments where the method is deployed onto a real UAV show the real-world applicability of the method.

  • 46520.
    Welle, Michael
    et al.
    KTH, School of Computer Science and Communication (CSC), Robotics, perception and learning, RPL. KTH, School of Computer Science and Communication (CSC), Centres, Centre for Autonomous Systems, CAS.
    Ericson, Ludvig
    KTH, School of Computer Science and Communication (CSC), Robotics, perception and learning, RPL. KTH, School of Computer Science and Communication (CSC), Centres, Centre for Autonomous Systems, CAS.
    Ambrus, Rares
    KTH, School of Computer Science and Communication (CSC), Robotics, perception and learning, RPL. KTH, School of Computer Science and Communication (CSC), Centres, Centre for Autonomous Systems, CAS.
    Jensfelt, Patric
    KTH, School of Computer Science and Communication (CSC), Robotics, perception and learning, RPL. KTH, School of Computer Science and Communication (CSC), Centres, Centre for Autonomous Systems, CAS.
    On the use of Unmanned Aerial Vehicles for Autonomous Object Modeling2017In: 2017 European Conference on Mobile Robots, ECMR 2017, Institute of Electrical and Electronics Engineers (IEEE), 2017, article id 8098656Conference paper (Refereed)
    Abstract [en]

    In this paper we present an end to end object modeling pipeline for an unmanned aerial vehicle (UAV). We contribute a UAV system which is able to autonomously plan a path, navigate, acquire views of an object in the environment from which a model is built. The UAV does collision checking of the path and navigates only to those areas deemed safe. The data acquired is sent to a registration system which segments out the object of interest and fuses the data. We also show a qualitative comparison of our results with previous work.

  • 46521.
    Welleby, Tommy
    University of Skövde, School of Humanities and Informatics.
    Exempelinlärda ANN som artificiella förare i bilspel2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Artificiella neurala nätverk (ANN) kan användas för att lära och efterlikna olika beteenden. I det här projektet används ANN för att kontrollera en bil i en simulatormiljö genom att lära upp nätverken med mänskliga exempel. Syftet med projektet är att ta reda på vilken kombination av parametrar det är som gör att en bil kan kontrolleras av ANN med ett bra resultat. Detta undersöks genom att skapa åtta olika artificiella förare som representerar olika kombinationer av parametrar och sedan jämföra förarnas beteende och resultat för att se vilken förare som klarar sig bäst. På så vis är det sedan möjligt att härleda vilken kombination av parametrar som är den bästa för att kontrollera en bil med ANN. Resultaten från experimenten visar att den bästa kombinationen av parametrar för att styra en artificiell bilförare med ANN är högnivåinput, högnivåoutput och en delad nätverksarkitektur. Framtida arbeten innefattar bland annat hybrider av kombinationer.

  • 46522.
    Wellme, Martin
    KTH, School of Information and Communication Technology (ICT).
    Mobil läkarrådgivning: Ett telemedicinsystem till Android2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The project aims to develop an Android application and an API (Application Programming Interface) to a telemedicine system. The system makes it possible for a patient and a doctor to talk to each other over the Internet with the help of video. With the mobile application, it is possible to get the same consultation on the move as the patient could get at home, or at a health clinic but without the physical interaction. The API makes everything possible by acting like a gateway between the system and the application.

    This thesis present the development of an Android application to a telemedicine system that is still under development. The paper explains how the system will be implemented to Android and how it will work.

    The result of the project is a prototype of an Android application of a telemedicine system which WeRLabs will hopefully be able to use and develop further.

  • 46523.
    Weman Josefsson, Karin
    et al.
    Halmstad University, School of Health and Welfare, Centre of Research on Welfare, Health and Sport (CVHI). University of Gothenburg, Gothenburg, Sweden.
    Halila, Fawzi
    Halmstad University, School of Business, Engineering and Science, Centre for Innovation, Entrepreneurship and Learning Research (CIEL).
    Johnson, Urban
    Halmstad University, School of Health and Welfare, Centre of Research on Welfare, Health and Sport (CVHI).
    Lindwall, Magnus
    University of Gothenburg, Gothenburg, Sweden.
    Wickström, Nicholas
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), CAISR - Center for Applied Intelligent Systems Research.
    Wärnestål, Pontus
    Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), Man and Information technology laboratory (MI-lab).
    Digital innovations and self-determined exercise motivation: a person-centred perspective2014In: Vitalis – Nordens ledande eHälsomöte 2014: Vetenskapliga papers presenterade vid Vitalis konferens, Svenska Mässan, Göteborg, 8-10 april 2014, Göteborg: Vitalis & Sahlgrenska akademin, Göteborgs universitet , 2014, p. 22-25Conference paper (Refereed)
    Abstract [en]

    Health care costs are increasing twice as fast as wealth, making health promotion and development of cost-effective care increasingly important in order to generate sustainable health care solutions. E-health, applications and interactive tools for exercise promotion flourish; but despite this and an overflow of information regarding health benefits of regular physical activity, exercise adherence has proven to be a significant challenge. This article concerns a project aimed to design an interactive tool based on comprehensive knowledge from the field of psychology combined with expertise from information technology and innovation, based on e-health industrial requirements and user needs. The research group will, together with the expertise and infrastructure of the collaborating companies Health Profile Institute AB and Tappa Service AB, support and progress an existing PhD-project on digital interventions in exercise motivation. This will be done by designing; applying and evaluating a person-centred digital intervention prototype for exercise motivation and adherence enhancement based on Self-Determination Theory.

  • 46524.
    Weman, Nicklas
    Linköping University, Department of Computer and Information Science.
    Empirical Investigation of the Effect of Pruning Artificial Neural Networks With Respect to Increased Generalization Ability2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This final thesis covers the basics of artificial neural networks, with focus on supervised learning, pruning and the problem of achieving good generalization ability. An empirical investigation is conducted on twelve dierent problems originating from the Proben1 benchmark collection.The results indicate that pruning is more likely to improve generalization if the data is sensitive to overtting or if the networks are likely to be trapped in local minima.

  • 46525.
    Weman, Sarah Jane
    et al.
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Klingzell, Linus
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Re-design på uppdrag av Spotify: Framtagning av designförslag för ny visningsvy för internprogram baserat på kontextuella intervjuer2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Spotify is a music service that offers on-demand streaming and is available in several countries worldwide. As the company and the interest for it grows, more and more parties are involved and those involved, including the record labels want to control and get an overview of their products. They want to be able to see, for example, when a product is available on Spotify and in which countries.

    Spotify is in May 2013 in process of developing a to be used by administrators on Spotify in order to meet the record labels with the information requested. The new software intends being used by administrators but also by the record labels so that they will be able to overview their products availability.

    We were asked by one of the developers to conduct user interviews and tests to result in a design proposal on how the display page of information about a product could be visualized more clearly so that it suits both record labels and employees at Spotify. The results of our contextual interviews were translated into a prototype with two display pages. One of them in list format to satisfy administrators and their work and a the other one in shape of a map primarily intended to accommodate the record labels. We made use of contextual design and its working models and interviewing techniques and worked iteratively with several prototype testing.

  • 46526.
    Weman, Sarah Jane
    et al.
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Molin, Erik
    Södertörn University, School of Natural Sciences, Technology and Environmental Studies.
    Att dela med sig av sin vardag: En studie om fotoapplikationen Instagram2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Photography has long been of importance for humans in aspects of community, sharing and documenting. It has previously only existed in analogue format and with larger cameras. We have presently reached a new generation of cameras and photography. The new smaller compact cameras that are provided with most cellular phones take digital images of varying quality and accounts for a large part of photography. With the emergence of social media, photography and social interaction combined came photo applications with different features. In our essay we chose to investigate the immensely popular photo application called Instagram. Our purpose is to identify how it’s being used and what filters do for the usage of it. We have, by conducting user interviews and an observational study, identified that some motifs are more popular than others, that the filter feature and aesthetic pursuit is essential for Instagram usage and that hashtags play an important part regarding “likes” and dissemination.

  • 46527.
    Wemmenhag, Johan
    Mälardalen University, School of Innovation, Design and Engineering.
    Utveckling av fondförsäkringssystem2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Idag används applikationen PensAd till att administrera traditionellt förvaltade pensionsförsäkringar. Syftet med detta arbete var att undersöka möjligheten att vidareutveckla PensAd till att även kunna hantera fondförsäkringar.

    Arbetet, som utfördes vid Brüggemann System AB i Stockholm, inleddes med introduktion till pensionsförsäkringar, PensAd och tillgängliga utvecklingsverktyg. Därefter planlades och avgränsades projektet till fyra faser som sedan låg till grund för det vidare arbetet.

    Inledningsfasen bestod av att skriva en kravspecifikation. Därefter utformades i projektets andra fas en abstrakt datamodell. Denna modell omvandlades i den tredje fasen till konkreta databastabeller för vidare implementering i PensAds befintliga databas. Projektets fjärde och sista fas utgjordes av att testa den nya databasstrukturen och därmed undersöka dess funktionalitet.

    Databasstrukturen med dess sju nya fondtabeller fungerade till belåtenhet enligt de testscenarier som sattes upp. Det gick att läsa in fondkurser från fil för att sedan skriva dessa till databasen. Att göra sökningar och hämta efterfrågad information från databasen gick även det som önskat.

    Målet var att skapa en grund för implementering av fondförsäkringar i PensAd, och detta anses vara uppfyllt.

  • 46528.
    Wemmert, Oscar
    Linköping University, Department of Computer and Information Science.
    Toward an on-line preprocessor for Swedish2017Independent thesis Basic level (degree of Bachelor), 12 credits / 18 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis presents OPT (Open Parse Tool), a java program allowing for independent parsers/taggers to be run in sequence. For this thesis the existing java versions of Stagger and Maltparser has been adapted for use as modules in this program, and OPT's performance has then been compared to an existing, in use, alternative (Språkbanken's Korp Corpus Pipeline, henceforth KCP). Execution speed has been compared, and OPT's accuracy has been coarsly tested as either comparable or divergent to that of KCP. The same collection of documents containing natural text has been fed through OPT and KCP in sequence, and execution time was recorded. The tagged output of OPT and KCP was then run through SCREAM (Sjöholm, 2012) and if SCREAM produced comparable results between the two, the accuracy of OPT was considered as comparable to KCP. The results show that OPT completes its tagging and parsing of the documents in around 35 minutes, while KCP took over four hours to complete. SCREAM performed almost exactly the same using the outputs of either program, except for one case in which OPT's output gave better results than KCP's. The accuracy of OPT was thus considered comparable to KCP. The one divergent example can not fully be understood or explained in this thesis, given that the thesis considers SCREAM's internals as mostly that of a black box.

  • 46529.
    Wen, Liang
    et al.
    University of Elect Science and Technology China, Peoples R China.
    Jiang, Wei
    University of Elect Science and Technology China, Peoples R China.
    Jiang, Ke
    Linköping University, Department of Computer and Information Science, Software and Systems. Linköping University, Faculty of Science & Engineering.
    Zhang, Xia
    University of Texas Dallas, TX USA.
    Pan, Xiong
    University of Elect Science and Technology China, Peoples R China.
    Zhou, Keran
    University of Elect Science and Technology China, Peoples R China.
    Detecting Fault Injection Attacks on Embedded Real-Time Applications: A System-Level Perspective2015In: 2015 IEEE 17TH INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE COMPUTING AND COMMUNICATIONS, 2015 IEEE 7TH INTERNATIONAL SYMPOSIUM ON CYBERSPACE SAFETY AND SECURITY, AND 2015 IEEE 12TH INTERNATIONAL CONFERENCE ON EMBEDDED SOFTWARE AND SYSTEMS (ICESS), IEEE , 2015, p. 700-705Conference paper (Refereed)
    Abstract [en]

    This paper presents an approach to the synthesis of secure real-time applications mapped on distributed embedded systems, which focuses on preventing fault injection attacks. We utilize symmetric cryptographic service to protect confidentiality, and deploy fault detection within confidential algorithm to resist fault injection attacks. Several fault detection schemes are identified, and their fault coverage rates and time overheads are derived and measured, respectively. Our synthesis approach makes efforts to determine the best fault detection schemes for the encryption/decryption of messages, such that the overall security strength of resisting fault injection attack is minimized, and the deadline constraint of the real-time applications is guaranteed. Since addressing the problem is still a NP-hard problem, we propose an efficient algorithm based on Fruit fly Optimization Algorithm (FOA), which can achieve better results by lower time overheads, compared with simulated annealing algorithm. Extensive experiments demonstrate the superiority of our approach.

  • 46530.
    Wen, Wei
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Khatibi, Siamak
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Back to basics: Towards novel computation and arrangement of spatial sensory in images2016In: Acta Polytechnica, ISSN 1210-2709, Vol. 56, no 5, p. 409-416Article in journal (Refereed)
    Abstract [en]

    The current camera has made a huge progress in the sensor resolution and the low-luminance performance. However, we are still far from having an optimal camera as powerful as our eye is. The study of the evolution process of our visual system indicates attention to two major issues: the form and the density of the sensor. High contrast and optimal sampling properties of our visual spatial arrangement are related directly to the densely hexagonal form. In this paper, we propose a novel software-based method to create images on a compact dense hexagonal grid, derived from a simulated square sensor array by a virtual increase of the fill factor and a half a pixel shifting. After that, the orbit functions are proposed for a hexagonal image processing. The results show it is possible to achieve image processing operations in the orbit domain and the generated hexagonal images are superior, in detection of curvature edges, to the square images. We believe that the orbit domain image processing has a great potential to be the standard processing for hexagonal images.

  • 46531.
    Wen, Wei
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Khatibi, Siamak
    Blekinge Institute of Technology, Faculty of Computing, Department of Communication Systems.
    Towards Measuring of Depth Perception from Monocular Shadow Technique with Application in a Classical Painting2016In: Journal of Computers, ISSN 1796-203X, Vol. 11, p. 310-319Article in journal (Refereed)
    Abstract [en]

    Depth perception is one of important abilities of the human visual system to perceive the three dimensional world. Shadow technique that offers different depth information from different viewing points, known as Da Vinci stereopsis, has been used in classical paintings. In this paper, we report a method towards measuring the relative depth information stimulated by Da Vinci stereopsis in a classical painting. We set up a positioning array of cameras for capturing images from the portrait using a high resolution camera, where the changes of shadow areas are measured by featuring the effects as point and line changes. The result shows that 3D effects of the classical painting are not only a perceptual phenomenon but they are also physically tangible and can be measured. We confirm validity of the method by its implementation even on a typical single image and comparison of results between the single image and the portrait.

  • 46532.
    Wen, Wei
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Siamak, Khatibi
    Blekinge Institute of Technology, Faculty of Computing, Department of Technology and Aesthetics.
    Estimation of Image Sensor Fill Factor Using a Single Arbitrary Image2017In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, no 3, p. 620-Article in journal (Refereed)
    Abstract [en]

    Achieving a high fill factor is a bottleneck problem for capturing high-quality images. There are hardware and software solutions to overcome this problem. In the solutions, the fill factor is known. However, this is an industrial secrecy by most image sensor manufacturers due to its direct effect on the assessment of the sensor quality. In this paper, we propose a method to estimate the fill factor of a camera sensor from an arbitrary single image. The virtual response function of the imaging process and sensor irradiance are estimated from the generation of virtual images. Then the global intensity values of the virtual images are obtained, which are the result of fusing the virtual images into a single, high dynamic range radiance map. A non-linear function is inferred from the original and global intensity values of the virtual images. The fill factor is estimated by the conditional minimum of the inferred function. The method is verified using images of two datasets. The results show that our method estimates the fill factor correctly with significant stability and accuracy from one single arbitrary image according to the low standard deviation of the estimated fill factors from each of images and for each camera.

  • 46533.
    Wendel, Andreas
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Vad försiggår i produktionen?: En fallstudie på Aller Tryck AB2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Att ha kontroll över informationen och se till att denna är korrekt är numera en förutsättning för att kunna bedriva en effektiv verksamhet. Utöver detta kräver en effektiv organisation även att man har kontroll och överblick över de processer vilka finns i organisationen.

    Dessa processer måste kunna beskrivas och åskådliggöras för att på så sätt kunna se vart informationen skapas och om detta är ett bra tillvägagångssätt.

    För att kunna göra detta har jag således studerat litteratur kring information och informationssystem för att på så sätt kunna redogöra för hur data bör hanteras för att kunna omvandlas till korrekt och bra information vilken kan användas såsom beslutsunderlag. Utöver detta har litteratur kring processbeskrivningar studerats för att på ett så korrekt sätt som möjligt kunna åskådliggöra de processer vilka finns i organisationen. Med detta som grund kunde sedan organisationen studeras för att finna problem i hanteringen och skapandet utav data och information.

    Aller Tryck AB uttryckte tidigt ett önskemål om att erhålla en processbeskrivning över sin produktion och de informationsflöden vilka kan synliggöras här. De efterfrågade även en kontroll utav den data vilken ligger till grund för mycket av arbetet i produktionen och dennes planering.

    En processbeskrivning gjordes således samt att en fallstudie genomfördes för att kunna påvisa de faktorer vilka påverkar den data vilken misstänktes för att vara inkorrekt.

    Resultatet påvisade stora brister i mätmetoderna och hanteringen av denna information. De applikationer vilka finns i organisationen är inte integrerade och den manuella hanteringen spär således på felkällorna till den redan felaktiga datan.

  • 46534.
    Wendel, Robin
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Virtuella doftspår på webbplatser2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Människan är nyfiken och vill finna ny information på webbplatser. Detta kan underlättas med hjälp av virtuella doftspår som användaren följer. Denna rapport är en fördjupning i hur människan går tillväga för att följa virtuella doftspår och hur man som designer ska använda sig av detta när man utvecklar en webbplats. Genom teorierna information foraging och användbarhet har en användbarhetsmodell och en operationalisering tagits fram för att underlätta detta. Tillsammans med datainsamling genom intervjuer och metoderna heuristisk utvärdering och high fidelity har studien visat att när man skapar ett gränssnitt för användare behövs information foraging som bestämmer eller lämnar förslag på hur virtuella doftspår påverkar användaren.

  • 46535.
    Wendelhof, Hans-Göran
    Linköping University, Department of Computer and Information Science.
    Nyföretagarens väg till relevant information: Behovsanalys inför utvecklingen av en kommunal näringslivsportal2006Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Svensk samhällsinformation har sedan slutet av 60-talet utvecklats från i huvudsak enkelriktad kommunikation mot att bli alltmer kundorienterad och dialoginriktad. I och med utvecklingen av modern informationsteknik har nya kanaler uppstått för spridningen av information. Detta har fått stort genomslag på statlig nivå där ett antal nämnder, delegationer och myndigheter har medverkat i utvecklingen av en reformvision om 24-timmarsservice. Visionen innebär bland annat att såväl medborgare som företag ska kunna hämta information dygnet runt och beredas möjligheter till elektronisk självbetjäning i flera ärenden. I Linköpings kommun har ett flertal medborgarorienterade e-tjänster utvecklats och för närvarande förbereder man implementeringen av en informationsportal för näringslivet. Denna studie syftar till att undersöka informationsbehovet hos en avgränsad del av målgruppen för denna portal, nämligen nyföretagare.

    Studien tog sin utgångspunkt i huvudfrågeställningen "Vilket informationsbehov har nyföretagare?" som delades in i tre delfrågeställningar; "Vilken information behöver nyföretagare för att etablera verksamhetsrutiner och därigenom skapa förutsättningar för det dagliga arbetet?", "Hur upplever nyföretagare sitt informationsbehov så som det kommer till uttryck i situationer där nödvändig kunskap saknas för att lösa problem?" och "Hur hanterar nyföretagare sitt informationsbehov i relation till tillgängliga informationskanaler?". En kvalitativ fallstudiemetod med utgångspunkt i fenomenografi och grundad teori fick utgöra ramverk för datainsamling, bearbetning och analys. Under datainsamlingen genomfördes nio öppna intervjuer med elva informanter. I analysfasen studerades resultatet i relation till studiens delfrågeställningar och till Wilsons, Choos och Belkins begreppsmodeller.

    Studien indikerar att nyföretagare i målgruppen för Linköpings kommuns informationsportal hyser ett mångfacetterat informationsbehov. Detta uppstår när nyföretagaren antar olika roller som en naturlig del av verksamheten, exempelvis kan nyföretagaren agera hantverkare, försäljare eller arbetsgivare för att hantera olika situationer. Vid branschspecifika händelser kan nyföretagaren till exempel behöva information om hur man söker särskilda tillstånd och vid standardhändelser kan han eller hon liksom egenföretagare i andra branscher behöva information om bolagsregistrering eller skattedeklaration. Informationsbehovet styrs dock inte enbart av vilken information som behövs för att lösa problem utan även av hur informationen presenteras, över vilka kanaler den förmedlas och genom vilka frågeställningar den blir tillgänglig. Av betydelse kan också vara hur nyföretagaren uppfattar sitt informationsbehov i relation till kunskap om informationssökningsstrategier, mod att formulera frågor inom ett främmande område och kommunikationsroller mellan sändare och mottagare. Vissa i målgruppen verkar föredra verkliga möten och telefonkontakt framför elektronisk kommunikation. Detta kan bero på att det verkliga mötet möjliggör en annan typ av kommunikation än det virtuella genom att det tillåter överföring av implicit kunskap och kan underlätta frågeformulering. Studien har resulterat i en konceptskiss över en informationstjänst som tar utgångspunkt i resonemanget om roller, branschspecifika händelser och standardhändelser.

  • 46536.
    Wendelholt, Erica
    University of Skövde, School of Humanities and Informatics.
    Evolutionary Psychology - Sex Differences in Spatial Abilities2008Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Sex differences in spatial ability, especially mental rotation, navigation and object-location memory are described in this essay. Biological differences in brain morphology, hormones and genes between men and women are presented as explanations for the sex differences. Another level of explanations offered are evolutionary, hence the most influential evolutionary psychological theories are summarized and evaluated. These theories are Gaulin’s and Fitzgerald’s male range theory, Silverman’s and Eals’s hunter-gatherer theory, and Ecuyer-Dab’s and Robert’s twofold selection theory. The hunter-gatherer theory at present seems to be of the most importance, though the twofold selection theory may in the future challenge it. Regardless, united biological and evolutionary explanations would create the best comprehensive theory.

  • 46537.
    Wendelius, Mikael
    University of Skövde, Department of Computer Science.
    Korrelationen mellan användares effektivitet och subjektiva uppfattning på world wide web2002Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Inom Human- Computer Interaction är användbarhet ett mycket centralt

    begrepp. Användbarhet kan i sin tur delas upp i effektivitetsmått och

    subjektiv uppfattning. Det råder idag delade meningar i forskarvärlden huruvida det existerar en korrelation mellan dessa två mått. Om denna korrelation existerar kanske vidare forskning visar att någon av de två inte utgör en nödvändig del av användbarhetsbegreppet. Om så är fallet skulle detta kunna leda till enklare och billigare design och utvärderingsprocesser. Den här undersökningen syftar till att undersöka om det existerar en korrelation mellan effektivitet och subjektiv uppfattning på world wide web samt att undersöka om det råder skillnader i denna korrelation mellan experter och noviser. För att undersöka detta har en användbarhetsutvärdering med 31 försöksdeltagare genomförts på en webbsida publicerad på www. Resultatet av undersökningen visar inte på några samband eller korrelationer och resultaten är endast marginellt signifikanta. Inga klara slutsatser kan därför dras utifrån resultaten.

  • 46538.
    Wendin, Johan
    University of Skövde, School of Informatics.
    BAKGRUNDSHISTORIENS PÅVERKAN PÅ SPELUPPLEVELSEN2014Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Digitala spel har utvecklats kraftigt de senaste 10 åren. Moderna spel kan skryta med otroliga världar med trovärdiga karaktären och visuella egenskaper som liknar modern film. Modern teknologi har förmågan att skapa världar som kan uppsluka vår uppmärksamhet som aldrig förut. Många moderna spel lägger även stort fokus på att skapa ett narrativ som ger kontext och mening till den virituella världen. Ett sätt att skapa narrativ i spel har varit att implementera en bakgrundshistoria som spelaren får ta del av innan man börjar interagera med spelet.

    Målet med denna rapport har varit att koppla teorier om the magic circle till teorier om perception, och immersion för att försöka få en bild över hur spelarna upplever spelvärlden.  För att sedan undersöka hur en bakgrundshistoria påverkar spelupplevelsen.

    För att undersöka bakgrundshistoriens påverkan på spelupplevelsen har det utvecklas ett spel med två versioner. Spelet som utvecklats är ett äventyrsspel i förstapersonsperspektiv där målet är att klara två utmaningar för att utföra en religiös ritual. En version av spelet har en kort introduktionssekvens av text med bakgrundshistoria, och den andra versionen av spelet har inte denna introduktionssekvens. I versionen utan bakgrundshistoria får spelarna alltså direkt börja interagera med mjukvaran efter att den startats. I den ena versionen av spelet har spelarna fått bygga sitt egna narrativ och kontext, och i den andra har de fått ta del av ett narrativ och kontext i form av en bakgrundshistoria.

    Påverkan på spelupplevelsen har undersökts genom att två grupper med testpersoner fått spela varsin version av spelet och sedan besvarat enkät och intervjufrågor. Dessa frågor har undersökt hur personerna upplevt immersion, narrativ, spelmekanik samt estetik. Denna information har sedan kopplats till Bartles (1996) taxonomi av spelartyper för att skapa ett mer generaliserbart resultat.

    Undersökningen kunde inte ge något klart resultat över bakgrundshistoriens påverkan på spelupplevelsen. Resultaten var väldigt spridda över de båda testgrupperna där immersionsnivåerna varierat kraftigt. För att få mer generaliserbara resultat skulle fler testpersoner behövas samt så skulle man behöva använda sig av en jämn grupp av de olika spelartyperna.

  • 46539.
    Wendin, Martin
    et al.
    KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
    Lawphongpanich, Siriphong
    Yin, Yafeng
    FINDING BOUNDEDLY RATIONAL USER EQUILIBRIUM FLOWS2010In: TRANSPORTATION AND URBAN SUSTAINABILITY, HONG KONG: HONG KONG SOC TRANSPORTATION STUDIES LTD , 2010, p. 327-334Conference paper (Refereed)
    Abstract [en]

    Models for transportation network analysis in the literature typically assume that users always choose shortest or least-cost routes to reach their destinations regardless of the saving these routes offer. Under this assumption, users are perfectly or unboundedly rational and a flow distribution is in equilibrium when users cannot improve their travel time or cost by unilaterally changing routes. However, users in practice often switch to alternative routes only when they offer significant time or cost saving, i.e., users are boundedly rational. This paper addresses the problem of finding an equilibrium flow distribution when users are boundedly rational. Because link-based conditions for boundedly rational user equilibrium only identities a subset of such distributions, the formulation herein is path-based and contains complementarity constraints, a class of constraints that violates standard regularity conditions. The proposed algorithm is distinct from other path-generating schemes because it generates paths for two purposes, one to make the current solution feasible and the other to find an improved solution.

  • 46540.
    Wendt, Emelie
    University of Skövde, School of Humanities and Informatics.
    Hitta rätt - utveckling av navigationsstöd2008Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete har utförts i samarbete med företaget Compute och fokuserar på att utveckla navigationsstöd för webbportaler med bokningssystem. Arbetet har delats upp i tre specifika mål: (1) integrera Information Foraging Theory (IFT) och Graphical User Interface principles (GUI-principer) genom att applicera dessa vid utvecklng av navigation för webbportaler med bokningssystem (2) konkretisera hur navigering kan förbättras på en webbportal med bokningssystem, utifrån ovanstående teroier och (3) arbetet skall resultera i en lista med rekommendationer som kan tillämpas vid utveckling av navigation. För att kunna  integrera IFT och GUI-principer har dessa i kombination med en teroertisk studie tillämpats vid prototyping. Prototyperna användes som verktyg för att konkretisera hur navigationen kunde förbättras på portalen. Prototyperna utvärderades och resulterade i en lista med rekommendationer. Resultaten från utvärderingen påvisade att en integrering av GUI-principer och IFT kan förbättra nvigationsförhållanden på en webbportal. Arbetes främsta bidrag är listan med rekommendationer som skall kunna tillämpas vid navigationsutveckling.

     

  • 46541.
    Wendt, Michael
    et al.
    Halmstad University, School of Information Technology.
    Kadar Rosengren, Robin
    Halmstad University, School of Information Technology.
    Carving och innehållssökning av komplexa dokument: En jämförelse av verktyg2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    File carving är konsten att återskapa raderade filer utan hjälp av filsystemsinformation. Speciellt viktigt skulle detta kunna vara vid utredning av ekonomisk brottslighet som utgör en vital del inom bekämpning av prioriterade områden som organiserad brottslighet och terrorism. I detta arbete presenteras ett nytt verktyg för att utföra file carving som även jämförs mot andra verktyg på marknaden med tyngdpunkt på processtid och minnesanvändning. Dessutom riktas fokus på egenskapen att snabbt kunna söka efter nyckelord i de framtagna filerna. Detta är något som kan vara mycket användbart när det finns behov av att snabbt hitta relevant information i en brottsutredning. Då filformaten .docx samt .pdf hör till de vanligaste typerna av textfiler har testerna valts att göras på dessa. I arbetet har det även undersökts hur polisen arbetar med file carving och sökning i textdokument idag. EnCase är det absolut mest använda programmet hos polisen, men testerna visade att det är både långsamt och resurskrävande. Verktyget Autopsy visade sig vara ett snabbare alternativ, men det nykomna verktyget Alice var mindre, snabbare och resurssnålare än båda alternativ. EnCase kunde inte heller visa resultaten av en textsökning på ett lika överskådligt sätt som Autopsy och Alice.

  • 46542.
    Wendt, Stefan
    University of Skövde, Department of Computer Science.
    Beskrivning av objektorienterade system med hjälp av designmönster2000Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    Designmönster har under senare år blivit ett allt mer vanligt förekommande begrepp inom objektorienterad systemutveckling. Designmönster har nämligen visat sig kunna höja abstraktionsnivån vid designbeslut, vilket dels leder till en effektivisering av denna process, men även minskar risken att fel begås då de döljer viss komplexitet. Designmönster har främst setts som ett sätt att återanvända gamla designlösningar, som har visat sig vara bra i vissa återkommande problemsituationer. En positiv effekt av att dessa används har också varit att ett gemensamt språk i termer av designmönster har skapats. I detta projekt har dock designmönster studerats utifrån aspekten att använda dessa för att förbättra dokumentationen av objektorienterade programvarusystem. Enligt teorier i litteraturen kan designmönster nämligen användas som hjälp vid dokumentering av programvarusystem. Syftet är då att öka förståelsen av systemets arkitektur, vilket skulle underlätta framtida förändringar av detta system. Genom resultatet av ett experiment som har genomförts på ett existerande objektorienterat programvarusystem, har projektet visat sig stödja dessa teorier. Dessutom har det visats att processen med att härleda designmönster ur ett existerande system även kan leda till förbättringsförslag i arkitekturen.

  • 46543.
    Wennberg, Alex
    KTH, School of Computer Science and Communication (CSC).
    Intuitivity in HCI: A critical discourse analysis2017Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This article presents a study that has explored the concept of intuitivity in HCI research. A literature study was carried out on 76 articles published at the CHI conference between years 2004 and 2017, all discussing or claiming to design for intuitivity in some capacity. The articles have been approached through the lens of discourse analysis, and an inductive reading has been carried out to identify different perspectives on intuitvity, and themes related to intuitivity that appear in the articles. Ten different perspectives on intuitvity have been found within these articles, providing different views on what intuitivity is, and how to design for it. As they mostly, with a few exceptions, argue that intuitivity is a desirable quality despite these large differences in perspectives it is argued that the term has an exclusionary quality, making that which it does not consider invisible. Implications of this are discussed, with a focus on the fact that all articles assume and design for able-bodied users.

  • 46544.
    Wennberg, Paula
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Activity: Gender in research and administration2014Conference paper (Other (popular science, discussion, etc.))
  • 46545.
    Wennberg, Paula
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Activity: Innovation and gender - our offer2013Conference paper (Other (popular science, discussion, etc.))
  • 46546.
    Wennberg, Paula
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Project: GENOVATE EU FP7 Science in Society Project2015Other (Other (popular science, discussion, etc.))
    Abstract [en]

    The GENOVATE project aims to ensure equal opportunities for women and men in research, innovation and higher academic decision-making bodies. LTU focus on Information and Communication Technology and further development of gender-mainstreaming tools and methods.Follow us on Twitter @genovateLTU

  • 46547.
    Wennberg, Paula
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Project: GENOVATE Sweden2013Other (Other (popular science, discussion, etc.))
    Abstract [en]

    GENOVATE seeks to ensure equal opportunities for women and men by encouraging a more gender-competent management in research, innovation and scientific decision-making bodies, with a particular focus on universities.

  • 46548.
    Wennberg, Paula
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Project: SATIN Project2015Other (Other (popular science, discussion, etc.))
    Abstract [en]

    The aim of the SATIN project is to enable end-users without prior programming skills to create own apps and mobile services. How to challenge ingrained gender roles and avoid preserving stereotypes throughout the design process is one of the challenges when developing the SATIN platform to be as inclusive as possible

  • 46549.
    Wennberg, Paula
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Project: SATIN project Gender & Diversity2015Other (Other (popular science, discussion, etc.))
    Abstract [en]

    The Gender App is useful when testing how a project meets the quality standards in terms of inclusion and diversity.

  • 46550.
    Wennberg, Paula
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Distance- Spanning Technology.
    Projekt: Mäta Jämt2013Other (Other (popular science, discussion, etc.))
    Abstract [en]

    The main objective of the Mäta Jämt project (2010-2013) is to develop tools and methods to measure effects of gender equality and diversity activities in ICT and educational environments.

928929930931932933934 46501 - 46550 of 49380
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf