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  • 51.
    Angulo, Julio
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Wästlund, Erik
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Psychology.
    Gullberg, Peter
    Gemalto, Gothenburg.
    Kling, Daniel
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Tavemark, Daniel
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Fischer-Hübner, Simone
    Karlstad University, Division for Information Technology.
    Understanding the user experience of secure mobile online transactions in realistic contexts of use2012In: Symposium on Usable Privacy and Security (SOUPS) 2012, Washington D.C.,USA: Association for Computing Machinery (ACM), 2012, p. 8-Conference paper (Refereed)
    Abstract [en]

    Possible attacks on mobile smart devices demand higher security for applications handling payments or sensitive information. The introduction of a tamper-proof area on future generations of mobile devices, called Trusted Execution Environment (TEE), is being implemented. Before devices with embedded TEEs can be deployed to the public, investigations on usability aspects of Trusted User Interfaces (TUI) are needed. This article describes the process we have followed at gathering requirements, prototyping and testing suitable designs for TUIs in combination with a touch-screen biometric system. At the end, we present relevant findings of a pilot study that we have conducted using an Experience Sampling Method (ESM) as part of our ongoing work.

  • 52.
    Angulo, Julio
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Wästlund, Erik
    Johan, Högberg
    What Would It Take for You to Tell Your Secrets to a Cloud?: Studying decision factors when disclosing information to cloud services2014In: Secure IT Systems: 19th Nordic Conference, NordSec 2014, Tromsø, Norway, October 15-17, 2014, Proceedings, Springer, 2014, Vol. 8788, p. 129-145Conference paper (Refereed)
    Abstract [en]

    We investigate the end users’ behaviours and attitudes with regards to the control they place in the personal information that they disclose to cloud storage services. Three controlled experiments were carried out to study the influence in users’ decisions to retain or surrender control over their personal information depending on different factors. The results of these experiments reveal, among other things, the users’ willingness to surrender control over personal information that is perceived as non-sensitive in exchange for valuable rewards, and that users would value the possibility of knowing and controlling the parties who are granted access to their data in the cloud. Based on the results from the experiments we provide implications for the design of end-user tools that can promote transparency and accountability in cloud computing environments.

  • 53.
    Arvidsson, Åke
    et al.
    Kristianstad University, Kristianstad, Sweden..
    Grinnemo, Karl-Johan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Chen, Eric
    Kristianstad University, Kristianstad, Sweden..
    Qinghua, Wang
    Kristianstad University, Kristianstad, Sweden..
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Web metrics for the next generation performance enhancing proxies2019In: 2019 International Conference on Software, Telecommunications and Computer Networks (SoftCOM), IEEE, 2019Conference paper (Refereed)
    Abstract [en]

    The fast growth of Internet traffic, the growingimportance of cellular accesses and the escalating competitionbetween content providers and network operators result in agrowing interest in improving network performance and userexperience. In terms of network transport, different solutionsranging from tuning TCP to installing middleboxes are applied.It turns out, however, that the practical results sometimes aredisappointing and we believe that poor testing is one of thereasons for this. Indeed, many cases in the literature limittesting to the simple and rare use case of a single file download,while common and complex use cases like web browsing oftenare ignored or modelled only by considering smaller files. Tofacilitate better testing, we present a set of metrics by whichthe complexity around web pages can be characterised andthe potential for different optimisations can be estimated. Wealso derive numerical values of these metrics for a small set ofpopular web pages and study similarities and differences betweenpages with the same kind of content (newspapers, e-commerceand video) and between pages designed for the same platform(computer and smartphone).

  • 54.
    Asplund, Katarina
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    An Evaluation of User Web Service Requirements2002Conference paper (Refereed)
  • 55.
    Asplund, Katarina
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Partially Reliable Multimedia Transport2004Report (Other academic)
    Abstract [en]

    The ongoing deployment of applications that transmit multimedia data makes it important for the Internet to better accommodate the service requirements of this type of applications. One approach is to provide a partially reliable service, i.e. a service that does not insist on recovering all but only some of the packet losses, thus providing less delay than a reliable transport service. This technical report describes a transport protocol that provides a partially reliable service. The protocol, called PRTP, is especially aimed at applications with soft real-time requirements. The report also presents performance results from a number of different experiments investigating different aspects of PRTP. The results indicate that transfer times can be significantly decreased when using PRTP as opposed to TCP when packets are lost in the network.

  • 56.
    Asplund, Katarina
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    The QoS Trade-off Between Latency and Image Quality on the Web: A User Perspective2002Conference paper (Refereed)
  • 57.
    Asplund, Katarina
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    The Trade-off Between Latency and Image Quality on the Web: A User Perspective2003In: / [ed] John Sören Pettersson, 2003Chapter in book (Other academic)
  • 58.
    Asplund, Katarina
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Garcia, Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Schneyer, S.
    Decreasing Transfer Delay Through Partial Reliability2000Conference paper (Refereed)
  • 59.
    Atxutegi, Eneko
    et al.
    University of the Basque Country.
    Liberal, Fidel
    University of the Basque Country.
    Grinnemo, Karl-Johan
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Arvidsson, Åke
    Kristianstad University.
    TCP Performance over Current Cellular Access: A Comprehensive Analysis2018In: Autonomous Control for a Reliable Internet of Services: Methods, Models, Approaches, Techniques, Algorithms and Tools / [ed] Ivan Ganchev, R. D. van der Mei, Hans van den Berg, Cham: Springer, 2018, p. 371-400Chapter in book (Refereed)
    Abstract [en]

    Mobile internet usage has significantly raised over the last decade and it is expected to grow to almost 4 billion users by 2020. Even after the great effort dedicated to the improvement of the performance, there still exist unresolved questions and problems regarding the interaction between TCP and mobile broadband technologies such as LTE. This chapter collects the behavior of distinct TCP implementation under various network conditions in different LTE deployments including to which extent the performance of TCP is capable of adapting to the rapid variability of mobile networks under different network loads, with distinct flow types, during start-up phase and in mobile scenarios at different speeds. Loss-based algorithms tend to completely fill the queue, creating huge standing queues and inducing packet losses both under stillness and mobility circumstances. On the other side delay-based variants are capable of limiting the standing queue size and decreasing the amount of packets that are dropped in the eNodeB, but they are not able under some circumstances to reach the maximum capacity. Similarly, under mobility in which the radio conditions are more challenging for TCP, the loss-based TCP implementations offer better throughput and are able to better utilize available resources than the delay-based variants do. Finally, CUBIC under highly variable circumstances usually enters congestion avoidance phase prematurely, provoking a slower and longer start-up phase due to the use of Hybrid Slow-Start mechanism. Therefore, CUBIC is unable to efficiently utilize radio resources during shorter transmission sessions.

  • 60.
    Axelsson, Lars-Erik
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Identify User Profiles in Information Systems with Unknown Users: A database modelling approach2006In: International Journal of Public Information SystemsArticle in journal (Refereed)
    Abstract [en]

    Most traditional models for system development presuppose that users of the system are known and possible to communicate with. If this is not achievable traditional design methods are less usable in order to analyze and describe the requirements of the users. This paper proposes to complement view design with ideas based on interaction design and semiotics and aims to describe the requirements and wishes of potential and unknown users in information systems supported by image or multimedia databases. In the paper the activity steps of view modelling are brought together with persona techniques from interaction design. The outcome of the proposed method reduces the amount of work considerably and, in addition, reduces the problems associated with involving users in the design process. In addition it forms the basis for the specification of a more informative study to increase the acceptability of databases in public environments

  • 61.
    Axelsson, Lars-Erik
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Konceptuell modellering av multimediadatabaser-går det?2000Chapter in book (Refereed)
    Abstract [sv]

    Databaser modelleras bäst - eller möjligen endast - med användning av konceptuell modellering. Detta är en sanning för traditionella databaser. Men gäller det också för databaser som lagrar information från olika datakällor? Är det rimligt att arbeta med begreppen objekt, variabler och relationer när vi skall modellera användarnas syn på bilder, ljud, eller videodata var för sig eller tillsammans? Kan vi dessutom överhuvudtaget anlägga en konceptuell syn på upplevelser av en bild eller ett musikstycke? Vad händer när vi kommer utanför modellens traditionella användningsområden? Ger metoden en möjlighet att även modellera mer ostrukturerad och sammansatt information? Detta kapitel för ett resonemang om några konsekvenser som blir följden av att använda konceptuell modellering vid design av multimediadatabaser. Studien är explorativ och är en del av ett forskningsarbete

  • 62.
    Bellalta, Boris
    et al.
    Department of Information and Communication Technologies, Universitat Pompeu Fabra, Barcelona 08018, Spain.
    Bononi, Luciano
    Department of Computer Science and Engineering, University of Bologna, 40127 Bologna, Italy.
    Bruno, Raffaele
    Institute for Informatics and Telematics (IIT), Italian National Research Council (CNR), Pisa 56124, Italy.
    Kassler, Andreas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Next generation IEEE 802.11 Wireless Local Area Networks: Current status, future directions and open challenges2016In: Computer Communications, ISSN 0140-3664, E-ISSN 1873-703X, Vol. 75, p. 1-25Article in journal (Refereed)
    Abstract [en]

    A new generation of Wireless Local Area Networks (WLANs) will make its appearance in the market in the forthcoming years based on the amendments to the IEEE 802.11 standards that have recently been approved or are under development. Examples of the most expected ones are IEEE 802.11aa (Robust Audio Video Transport Streaming), IEEE 802.11ac (Very-high throughput at < 6 GHz), IEEE 802.11af (TV White Spaces) and IEEE 802.11ah (Machine-to-Machine communications) specifications. The aim of this survey is to provide a comprehensive overview of these novel technical features and the related open technical challenges that will drive the future WLAN evolution. In contrast to other IEEE 802.11 surveys, this is a use case oriented study. Specifically, we first describe the three key scenarios in which next-generation WLANs will have to operate. We then review the most relevant amendments for each of these use cases focusing on the additional functionalities and the new technologies they include, such as multi-user MIMO techniques, groupcast communications, dynamic channel bonding, spectrum databases and channel sensing, enhanced power saving mechanisms and efficient small data transmissions. We also discuss the related work to highlight the key issues that must still be addressed. Finally, we review emerging trends that can influence the design of future WLANs, with special focus on software-defined MACs and the internet-working with cellular systems.

  • 63.
    Bellström, Peter
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Molin, Lennart
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    An Explorative Study for Evaluating 'Scratch': A Tool for Learning Programming2011In: / [ed] Niedrite, L., Strazdina, R. & Wangler, B., 2011, p. 208-215Conference paper (Refereed)
  • 64. Bergander, M.
    et al.
    de Haan, J.
    Pettersson, John Sören
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Pilotprojekt hösten 2004 inom området systemlösningar för mobiltjänster i arenamiljö2004Report (Other academic)
  • 65. Bergmann, Mike
    et al.
    Rost, Martin
    Pettersson, John Sören
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Exploring the feasibility of a spatial user interface paradigm for privacy-enhancing technology2006In: Advances in Information Systems Development: Bridging the Gap between Academia and Industry. Volume 1 / [ed] Nilsson, Gustas, Wojtkowski, Wojtkowski, Wrycza, Zupancic, New York: Springer , 2006, p. 437-448Conference paper (Refereed)
  • 66. Bergsten, P.
    et al.
    Eriksson, M.
    Johansson-Hidén, Birgitta
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Psychology. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Tillverkningsledning vid ökad marknadsanpassning1990Other (Other (popular science, discussion, etc.))
  • 67. Bergsten, P.
    et al.
    Eriksson, M.
    Johansson-Hidén, Birgitta
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Psychology. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Uddeholm Strip Steel AB1989Report (Other academic)
  • 68.
    Berthold, Stefan
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Clauß, Sebastian
    Linkability Estimation Between Subjects and Message Contents Using Formal Concepts2007Conference paper (Refereed)
    Abstract [en]

    In this paper, we examine how conclusions about linkability threats can be drawn by analyzing message contents and subject knowledge in arbitrary communication systems. At first, we define messages described by their contents as formal contexts. Then, we define subjects described by their knowledge as further formal contexts. Finally, we show that concept lattices, which are achieved by applying Formal Concept Analysis to the concatenation of these formal contexts, can be used in order to draw conclusions about correlations, and therefore linkability, between contents of messages and knowledge of subjects. The goal is to define formal specifications which can be utilized in privacy enhancing identity management systems in order to support users in the choice of data items which are to be disclosed to a communication partner

  • 69. Björlin-Lidén, Sara
    et al.
    Haglund, Lars
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Service Research Center. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Business Administration. Karlstad University, Faculty of Economic Sciences, Communication and IT, The Service and Market Oriented Transport Research Group. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Fellesson, Markus
    Sutomo, Heru
    Bringing the Customer into Public Transportat Development: A Pilot Study of Service Quality in Public Transportation in Indonesia2006Conference paper (Refereed)
  • 70.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Nordby, Eivind J
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    A Software Engineering Course that Integrates Education and Research2000Conference paper (Refereed)
  • 71.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Nordby, Eivind J
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    An Experimental Evaluation of Documentation Methods and Reusability2008Conference paper (Refereed)
    Abstract [en]

    This paper presents an experimental evaluation carried out in an academic environment. The goal of the experiment was to compare how different methods of documenting semantic information affect software reuse. More specifically, the goal was to measure if there were any differences between the methods with regard to the time needed to implement changes to existing software. Four methods of documentation were used; executable contracts, non-executable contracts, Javadoc-style documentation and sequence diagrams. The results indicate that executable contracts demanded more time than the other three methods and that sequence diagrams and Javadoc demanded the least time

  • 72.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Nordby, Eivind J
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    An Experimental Evaluation of Programming by Contract2002Conference paper (Refereed)
    Abstract [en]

    This paper presents an experiment designed to compare a contract-based programming method with a standard programming method based on exceptions. The purpose was to evaluate if using contracts would shorten development time, if contracts would improve work satisfaction and if contracts would increase the quality of the resulting software program. The experiment was performed in a project work course for students in the computer science program at Karlstad University. The students were to solve an assignment in groups of four within a period of ten weeks. Half of the groups used the contract-based method and the other half used the exception-based method. We gathered data on time consumption and work satisfaction on daily forms for statistical analysis. The results indicate that there is a gain in the time spent on implementation of the assignment if the contract-based method is used, but no significant difference in total time consumption was found. The results also indicate that the work satisfaction was slightly higher in the groups using the contract-based method. The resulting program was analyzed for a range of quality metrics, but no significant differences were found

  • 73.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Nordby, Eivind J
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Introducing Contract-Based Programming in Industry - A Case Study2005Conference paper (Refereed)
    Abstract [en]

    This paper presents a case study performed in an industrial project where we introduced and evaluated a method for supporting contract-based program development. The project constructed a large software system and involved around 30 people for 8 months. This paper reports on the designers' and programmers' attitudes towards programming by contract and how they perceived the effect the method had on their work. The results show that the designers and programmers were generally positive to contract-based program development and believed that the quality of their products would improve as an effect of the method

  • 74.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Nordby, Eivind J
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Method Description for Semla - A Software Design Method with a Focus on Semantics2000Report (Refereed)
  • 75.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Nordby, Eivind J
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Systemarkitektur och -design2000In: Del av kapitel 3 i "Industriell Programvaruteknik. Forskningsresultat i kortform", NUTEK Förlag Nr: B 2000:01 (www.nutek.se), ([MS Word]) , 2000Chapter in book (Other academic)
  • 76.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Nordby, Eivind J
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Teaching Semantic Aspects of OO Programming2002Conference paper (Refereed)
  • 77. Borowski, P.
    et al.
    Andersson, Kerstin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Malmqvist, P.-Å.
    Roos, B. O.
    The vibrational frequencies of ozone: A multiconfigurational approach1992In: Journal of Chemical Physics, 97:5568Article in journal (Refereed)
  • 78. Boström, Mattias
    et al.
    Siponen, Joe
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Simulering av grafiska gränssnitt - programvara för Ozlab2001Report (Refereed)
    Abstract [sv]

    I denna uppsats har vi försökt att kartlägga olika tekniker som möjliggör simulering av grafiska användargränssnitt. Denna simuleringsteknik skall underlätta för icke-programmerare (här: pedagoger) att på ett snabbt sätt testa sina ideer om människa-dator-interaktion i ett multimedialt simuleringslaboratorium kallat Ozlab. Att utforma gränssnitten blir enklare och går snabbare genom att man slipper en stor del av programmeringen, som till exempel input-kontroll i textfält. Denna teknik möjliggör en mer tidseffektiv läsning för att testa nya idéer om människa-dator-interaktion än den traditionella med fungerande prototyper vilka alltid kräver någon form av programmering. För att hitta en lämplig teknik för denna simulering har vi testat både egenutvecklade program och standardprogramvara som finns p marknaden samt en kombination av båda. I uppsatsarbetet ingick att lämna rekommendationer för programvara som kan vara lämpligt för ett Ozlab. Uppsatsens slutsats är att Macromedia Director 8.0 med Multiuser Server stödjer både kommunikation och gränssnittsuppbyggnad om Director förses med lämpliga förprogrammerade rutiner (behaviors)

  • 79.
    Bozakov, Zdravko
    et al.
    Dell EMC, Ireland.
    Mangiante, Simone
    Dell EMC, Ireland.
    Hernandez Benet, Cristian
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Brunström, Anna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013). Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Santos, Ricardo
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Kassler, Andreas
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science (from 2013).
    Buckley, Donagh
    Dell EMC, Ireland.
    A NEAT framework for enhanced end-host integration in SDN environments2017In: 2017 IEEE Conference on Network Function Virtualization and Software Defined Networks (NFV-SDN), IEEE, 2017Conference paper (Refereed)
    Abstract [en]

    SDN aims to facilitate the management of increasingly complex, dynamic network environments and optimize the use of the resources available therein with minimal operator intervention. To this end, SDN controllers maintain a global view of the network topology and its state. However, the extraction of information about network flows and other network metrics remains a non-trivial challenge. Network applications exhibit a wide range of properties, posing diverse, often conflicting, demands towards the network. As these requirements are typically not known, controllers must rely on error-prone heuristics to extract them. In this work, we develop a framework which allows applications deployed in an SDN environment to explicitly express their requirements to the network. Conversely, it allows network controllers to deploy policies on end-hosts and to supply applications with information about network paths, salient servers and other relevant metrics. The proposed approach opens the door for fine grained, application-aware resource optimization strategies in SDNs

  • 80.
    Brajdic, Agata
    et al.
    Fac. of EE & Comput., Univ. of Zagreb, Zagreb, Croatia .
    Kassler, Andreas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Matijasevic, Maja
    Quality of Experience based optimization of heterogeneous multimedia sessions in IMS2011In: Proceedings of Baltic Congress on Future Internet Communications, IEEE conference proceedings, 2011, p. 25-32Conference paper (Refereed)
    Abstract [en]

    For delivering multimedia services over (wireless) networks it is important that the mechanisms which negotiate and optimize content delivery under resource constraints take into account user perceived quality in order to improve user satisfaction. Within the scope of the IP Multimedia Subsystem (IMS) architecture a novel application server may be added which handles multi-user multi-flow Quality of Experience (QoE) negotiation and adaptation for heterogeneous user sessions. Based on a mathematical model, which takes into account the characteristics of audio, video and data sessions for QoE optimization, we develop several optimization algorithms to be used by the application server to maximize overall user defined QoE parameters for all ongoing multimedia sessions, subject to network resource constraints. Our results show that a greedy based approach provides a reasonable compromise in terms of run-time and sub-optimality for the overall QoE based resource allocations.

  • 81. Brauer, H.E.
    et al.
    Starnberg, H.I.
    Holleboom, Thijs Jan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Hughes, H.P.
    In situ intercalation of the layered compounds TiS2, ZrSe2, and VSe21995Conference paper (Refereed)
  • 82. Brauer, H.E.
    et al.
    Starnberg, H.I.
    Holleboom, Thijs Jan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Hughes, H.P.
    The electronic structure of ZrSe2 and Csx ZrSe2 studied by angle-resolved photoemission1995In: J. Phys. Condens. Matter 6, 7741 (1995)Article in journal (Refereed)
  • 83. Brauer, H.E.
    et al.
    Starnberg, H.I.
    Holleboom, Thijs Jan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Hughes, H.P.
    Strocov, V.N.
    Modifying the electronic structure of TiS2 by alkali metal interaction1999In: J. Phys. Condens. Matter 11, 8957 (1999)Article in journal (Refereed)
  • 84. Brauer, H.E.
    et al.
    Starnberg, H.I.
    Holleboom, Thijs Jan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Hughes, H.P.
    Strocov, V.N.
    Na and Cs intercalation of 2H-TaSe2 studied by photoemission2001In: J. Phys. Condens. Matter 13, 9879-9895 (2001)Article in journal (Refereed)
  • 85. Brauer, H.E.
    et al.
    Starnberg, H.I.
    Holleboom, Thijs Jan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Strocov, V.N.
    Hughes, H.P.
    Electronic structure of pure and alkali metal intercalated VSe21998In: Phys. Rev B 58, 10031 (1998)Article in journal (Refereed)
  • 86. Brauer, H.E.
    et al.
    Starnberg, H.I.
    Hughes, H.P.
    Holleboom, Thijs Jan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Band mapping of in situ Cs intercalated transition metal dichalcogenides1996In: Surf. Sci. 357-358, 345 (1996)Article in journal (Refereed)
  • 87. Brolin, Jonas
    et al.
    Dely, Peter
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Hedegren, Mikael
    Kassler, Andreas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Implementing Packet Aggregation in the Linux Kernel2008Conference paper (Refereed)
    Abstract [en]

    In multi-hop wireless mesh networks (WMN) Voice over IP (VoIP) suffers from large overhead created by the IP/UDP/RTP/MAC header and time due to collisions. As a result the VoIP capacity of WMNs is small. As shown in [1] a 3 hop WMN at a data rate of 2Mbit/s can only support 3 concurrent VoIP flows. [1], [2] and [3] propose the use of packet aggregation in order to reduce the overhead and thus increase the capacity. The idea behind packet aggregation is to combine multiple small packets into a single larger one, reducing overhead and collision probability in multi-hop environment. This paper presents insights into an implementation of an aggregation scheme in the Linux Kernel and its experimental evaluation

  • 88.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Reliable and Secure Communication in SCTP2010Conference paper (Refereed)
  • 89.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Alfredsson, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Garcia, Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Lindskog, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    NEWCOM DR6.2: First report on frameworks/models matching Department 6 needs2005Report (Refereed)
    Abstract [en]

    During the first phase of NEWCOM the focus areas of Department 6 were identified and refined. A number of relevant knowledge gaps were identified for the areas transport protocols, architectures and cross-layer aspects, and modelling. In this deliverable we describe a first set of frameworks/models to support research integration within the Department. The integration approach and the defined models/frameworks are described for each one of the selected knowledge gaps. The deliverable also includes a report on tools, software libraries and traces that can be shared between the partners

  • 90.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Asplund, Katarina
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Garcia, Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Enhancing TCP Performance by Allowing Controlled Loss2000Conference paper (Refereed)
  • 91.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Cavalcanti de Castro, Marcel
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Karlsson, Jonas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Kassler, Andreas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Palazzo, S
    DR11.2: Intermediate report on resource management issues and routing/forwarding schemes for opportunistic networks2009Report (Refereed)
  • 92.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Cavalcanti de Castro, Marcel
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Kassler, Andreas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Lavén, Andreas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Dely, Peter
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT. Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Galluccio, L
    NEWCOM++ DR11.3: Final report on the activities and results of WPR112010Report (Other academic)
    Abstract [en]

    This document is the last deliverable of WPR.11 and presents an overview of the final activities carried out within the NEWCOM++ Workpackage WPR.11 during the last 18 months. We provide a description of the most consolidated Joint Research Activities (JRAs) and the main results so far obtained. We also address some considerations on the future activities which are expected to continue at the end of NEWCOM++

  • 93.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Fischer Hübner, Simone
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Lindskog, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Martucci, Leonardo
    NEWCOM DR7.1: Report on the knowledge gaps to be filled and the action plan2004Report (Refereed)
    Abstract [en]

    This deliverable is the starting point of the activities in the NEWCOM Department 7 QoS Provision in Wireless Networks: Mobility, Security and Radio Resource Management. It provides the view of the department in terms of the objectives of the European research on Wireless Network aspects and, after developing the framework for QoS provision in wireless networks, it identifies the knowledge gaps existing in the fields of radio resource allocation, mobility management and security issues. As a result of that, the action plan for the future activities in the department is established

  • 94.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Garcia, Johan
    Lindskog, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    NEWCOM DR6.1: Report on the knowledge gaps to be filled and the action plan2004Report (Refereed)
    Abstract [en]

    The EU FP6 network of excellence in wireless communication, Newcom, is a large network that covers most areas of wireless communication. The research work within Newcom is organized into a number of departments and projects where Department 6 addresses Protocols and Architectures, and Traffic Modelling for (Reconfigurable/ Adaptive) Wireless Networks. The scope of Department 6 is quite broad making it important to further identify and refine the focus areas of the department. This document summarizes research areas that fall within the competence of and are of interest for the members of Department 6 and also describes the background of the partners within these areas. A set of knowledge gaps that will be addressed within the department are identified. A number of integrating activities that can be used to coordinate the efforts of the partners are described and an action plan for the continued work within the department is provided

  • 95.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Garcia, Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Lindskog, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    NEWCOM DR6.4: Proceedings of the Newcom Department 6 Second Technical Workshop2005Report (Refereed)
    Abstract [en]

    The Second Newcom Department 6 Technical Workshop was organized in Barcelona on September 16-17, 2005. The workshop program contained 6 presentations and provided a good overview of ongoing research integration activities within the department. All of the three areas of the department, transport protocols, architectures and cross-layer aspects, and modelling were represented with presentations. This deliverable contains the presentation material from the workshop. The included presentations are:



    - Westwood-SCTP: A Transport Protocol for Traffic Balancing on Multihomed Hosts

    - Transport Layer Handover using SCTP

    - The Optimization of Transport Protocol over Ad-Hoc Networks

    - Wireless Networks Emulation

    - An Analytical Model of Rate-Controlled MPEG Video Sources in a UMTS Network

    - An Analytical Model of a Rate-controlled MPEG-4 Video Source Capturing both Intra-frame and Inter-frame Correlation



    As an option, a supporting paper for the presentation could also be supplied by the authors. The

    deliverable contains supporting articles for two of the presentations

  • 96.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Kearns, P
    Global Predicate Detection Based on Transport Layer Vector Time1997Conference paper (Refereed)
  • 97.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Kearns, Phil
    Transport Layer versus Application Layer Vector Time1997Report (Refereed)
    Abstract [en]

    Vector time has emerged as a useful technique for solving problems in distributed systems. Although vector time is likely to be maintained by supporting code positioned in kernel space or in message-passing middleware, vector time is traditionally viewed as if it were defined at the application layer.

    In this paper we consider vector time as perceived at the transport layer. We establish existing relationships between transport layer and application layer vector time. Transport layer vector time provides a more up-to-date view of the current system state. Furthermore, transport layer vector time preserves any interprocess causal relationships captured by application layer vector time. We illustrate how the more up-to-date view of the transport layer can improve both the accuracy and the efficiency for algorithms on which concurrency has an adverse effect. Some general guidelines for when transport layer vector time may be appropriate are provided. The possibility of updating vector time for acknowledgment messages is also considered. A new

    distributed termination detection algorithm based on this feature is presented

  • 98.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Lindskog, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Proceedings of the 2nd International Workshop on Security and Communication Networks (IWSCN 2010)2010Book (Refereed)
    Abstract [en]

    This publication contains the Proceedings of the 2nd International Workshop on Security and Communication Networks (IWSCN 2010) that will be held on May 2628, 2010 in Karlstad, Sweden. IWSCN 2010 brings together researchers, developers, practitioners, and users interested in the area of security and communication networks. The workshop focuses on how to design, build, and evaluate future networks that are secure, reliable, and provide high and predictable performance. The aim of the workshop is to serve as a forum for presenting current and future work, as well as to exchange research ideas in these fields.Papers containing research contributions focusing on aspects of security and communication networks were solicited for submission to IWSCN 2010. A total of 40 papers were received, representing authors from 20 different countries and 5 different continents. Each paper was reviewed by at least three members of the technical program committee. After a thorough review process, 13 papers were selected for presentation at the workshop, giving an acceptance rate of 32.5%. In addition to the technical papers, two keynote presentations on The Changing Performance Goals in Internet Video Streaming and Dependable Protocols for Wireless Sensor Networks will be provided by Carsten Griwodz from the Simula Research Laboratory AS in Norway and Levente Buttyán from Budapest University of Technology and Economics in Hungary, respectively. Furthermore, a tutorial on Penetration Testing from an Attacker Perspective will be given by Vesa Virta from the National Defence Radio Establishment in Sweden.IWSCN 2010 is organized by the Department of Computer Science at Karlstad University and is supported by the Euro-NF and Newcom++ EU Networks of Excellence, and IEEE Sweden Section. The workshop is sponsored by Compare Karlstad Foundation, Coromatic, and TeliaSonera, and we thank them for their support. We also gratefully thank all authors, members of the program committee, and the local organizing committee for contributing to the scientific quality of the workshop

  • 99.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Lindskog, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Garcia, Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    NEWCOM DR6.6: Second report on common frameworks/models matching Department 62006Report (Refereed)
    Abstract [en]

    Work within Department 6 of NEWCOM is organized into the areas transport protocols, architectures and cross-layer aspects, and modelling. In this deliverable we provide a second report on the frameworks/models used to support research integration within the Department. The integration approach and the defined models/frameworks are described for each one of the three areas of the department. The deliverable also includes an updated report on tools, software libraries and traces that can be shared between the partners

  • 100.
    Brunström, Anna
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Lindskog, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    Garcia, Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Economic Sciences, Communication and IT, Centre for HumanIT.
    NEWCOM DR6.7: Proceedings of the Newcom Department 6 Second Technical Workshop2006Report (Refereed)
    Abstract [en]

    The Third Newcom Department 6 Technical Workshop was organized in Catania, Italy, on February 2, 2006. The workshop program contained 4 presentations and contained reports on ongoing integrated research activities as well as presentation intended to initiate additional joint research within the department. All of the three areas of the department, transport protocols, architectures and cross-layer

    aspects, and modelling were represented with presentations. This deliverable contains the presentation material from the workshop. The included presentations are:



    - P2P-based Video transmission in wireless networks

    - Transport Layer Handover using SCTP

    - WIPEMU 4G System Emulation and Sample Results

    - Wireless Networks Emulation



    Where available the presentation notes are also included with the presentations

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