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  • 51.
    Asplund, Katarina
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Implementation and Experimental Evaluation of aPartially Reliable Transport Protocol2004Licentiate thesis, monograph (Other academic)
    Abstract [en]

    In the last decade, we have seen an explosive growth in the deployment of multimedia applications on the Internet. However, the transport service provided over the Internet is not always feasible for these applications, since the network was originally designed for other types of applications. One way to better accommodate the service requirements of some of these applications is to provide a partially reliable transport service. A partially reliable transport service does not insist on recovering all, but just some of the packet losses, thus providing a lower transport delay than a reliable transport service. The work in this thesis focuses on the design, implementation, and evaluation of a partially reliable transport protocol called PRTP. PRTP has been designed as an extension to TCP in order to show that such a service could be effectively integrated with current protocol standards. An important feature of

    PRTP is that all modifications for PRTP are restricted to the receiver side, which means that it could be very easily deployed. The thesis presents performance results from various experiments on a Linux implementation of PRTP. The results suggest that transfer times can be decreased significantly when using PRTP as opposed to TCP in networks in which packet loss occurs. Furthermore, the thesis includes a study that investigates how users perceive an application that is based on a partially reliable service. Specifically, how users select the trade-off between image quality and latency when they download Web pages is explored. The results indicate that many of the users in the study could accept less than perfect image quality if the latency could be shortened.

  • 52.
    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)
  • 53.
    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.

  • 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.
    The QoS Trade-off Between Latency and Image Quality on the Web: A User Perspective2002Conference 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.
    The Trade-off Between Latency and Image Quality on the Web: A User Perspective2003In: / [ed] John Sören Pettersson, 2003Chapter in book (Other academic)
  • 56.
    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)
  • 57.
    Avallone, Stefano
    et al.
    Univ Naples Federico II, Dept Comp Engn, I-80125 Naples, Italy.
    Di Stasi, Giovanni
    Univ Naples Federico II, Dept Comp Engn, I-80125 Naples, Italy.
    Kassler, Andreas
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    A Traffic-Aware Channel and Rate Re-Assignment Algorithm for Wireless Mesh Networks.2013In: IEEE Transactions on Mobile Computing, ISSN 1536-1233, E-ISSN 1558-0660, Vol. 12, no 7, p. 1335-1348Article in journal (Refereed)
  • 58.
    Baucke, Stephan
    et al.
    Ericsson Research, Germany.
    Grinnemo, Karl-Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Ludwig, Reiner
    Ericsson Research, Germany.
    Brunström, Anna
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Wolisz, Adam
    Department of Electrical Engineering, Technical University Berlin, Germany.
    Using Relaxed Timer Backoff to Reduce SCTP Failover TimesManuscript (Other academic)
  • 59.
    Bayer, Nico
    et al.
    Deutsche Telekom/T-Systems, Darmstadt, Germany.
    Cavalcanti de Castro, Marcel
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Dely, Peter
    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.
    Koucheryavy, Yevgeni
    Tampere University of Technolo, Finland.
    Mitoraj, Piotr
    Tampere University of Technology, Finland.
    Staehle, Dirk
    University of Würzburg, Germany.
    VoIP service performance optimization in pre-IEEE 802.11s Wireless Mesh Networks2008In: Proceedings of the IEEE International Conference on Circuits andSystems for Communications (ICCSC) 2008, IEEE conference proceedings, 2008, p. 75-79Conference paper (Refereed)
    Abstract [en]

    802.11-based wireless mesh networks are seen as a means for providing last mile connections to next generation networks. Due to the low deployment cost and the mature technology used, they are scalable, easy to implement and robust. With an increasing coverage of wireless networks, VoIP becomes a cheaper alternative for traditional and cellular telephony. In this paper, we carry out a feasibility study of VoIP in a dual radio mesh environment. Heading towards 802.11s, we present the design of a mesh testbed and methodology for performing the measurements. Additionally, we address the problem that small voice packets introduce a high overhead leading to a low voice capacity of 802.11 based mesh networks. In order to alleviate this problem and increase the voice capacity, a novel packet aggregation mechanism is presented and evaluated using the ns-2 simulator.

  • 60.
    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.

  • 61.
    Bellström, Peter
    Karlstad University, Faculty of Arts and Social Sciences (starting 2013), Karlstad Business School (from 2013). Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    What do page users ask about? A content analysis of page user posts on a local government Facebook page2017In: Information Systems Development: Advances in Methods, Tools and Management (ISD2017 Proceedings) / [ed] Paspallis, N., Raspopoulos, M., Barry, C., Lang, M., Linger, H., Schneider, C., Association for Information Systems, 2017Conference paper (Refereed)
  • 62.
    Bellström, Peter
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Jakobsson, Lars
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Towards a Generic and Integrated Enterprise Modeling Approach to Designing Databases and Software Components2006In: Advances in Information Systems Development: Bridging the Gap between Academia and Industry  / [ed] Anders G. Nilsson, Remigijus Gustas, Wita Wojtkowski, W. Gregory Wojtkowski, Stanisław Wrycza, Jože Zupančič, Boston: Springer , 2006, p. 635-646Conference paper (Refereed)
    Abstract [en]

    In order to design databases and software components that are fulfilling the customers requirements, modeling languages that define them at a high level of abstraction are needed e.g. [2, 12, 15, 18]. Several modeling languages and methods have been proposed but most of them put focus on the implementation level and the technical parts of the future information system [15].

  • 63.
    Bergman, Andreas
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Pieskä, Marcus
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Westlinder, Simon
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Rust, Josefine
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Grinnemo, Karl-Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Mathematics and Computer Science.
    Socket Intents Extended for SCTP: Extended Version of Socket Intents to Use the Transport Protocol SCTP2016Report (Other (popular science, discussion, etc.))
    Abstract [en]

    This report covers a project in the course Computer Engineering Project, DVAE08, at Karlstad University. The aim of the project was to modify an already existing solution for selecting the most fitting path for known traffic online, with a proactive approach instead of a reactive, called Socket Intents. The purpose of the modified version is to make the previous solution compatible with the transport protocol SCTP. This solution consists of three new implemented components; a header parser, a sniffer, and a query manager. The header parser and sniffer receive packets from the traffic and send them to one another. The query manager handles queries from the policies to the sniffer, as well as the response. Together, these components will gather information about the state of the network, and select the most fitting path that fulfill application needs. The results achieved from the modification are good work for the SCTP one-to-one type. 

  • 64.
    Berthold, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Towards a Formal Language for Privacy Options2011In: Privacy and Identity Management for Life / [ed] Simone Fischer-Hübner, Penny Duquenoy, Marit Hansen, Ronald Leenes & Ge Zhang, Springer, 2011, p. 27-40Conference paper (Refereed)
  • 65.
    Berthold, Stefan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Towards Inter-temporal Privacy Metrics2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Informational privacy of individuals has significantly gained importance after information technology has become widely deployed. Data, once digitalised, can be copied and distributed at negligible costs. This has dramatic consequences for individuals that leave traces in form of personal data whenever they interact with information technology. The right of individuals for informational privacy, in particular to control the flow and use of their personal data, is easily undermined by those controlling the information technology.

    The objective of this thesis is the measurement of informational privacy with a particular focus on scenarios where an individual discloses personal data to a second party, the data controller, which uses this data for re-identifying the individual within a set of others, the population. Several instances of this scenario are discussed in the appended papers, most notably one which adds a time dimension to the scenario for modelling the effects of the time passed between data disclosure and usage. This extended scenario leads to a new framework for inter-temporal privacy metrics.

    The common dilemma of all privacy metrics is their dependence on the information available to the data controller. The same information may or may not be available to the individual and, as a consequence, the individual may be misguided in his decisions due to his limited access to the data controller’s information when using privacy metrics. The goal of this thesis is thus not only the specification of new privacy metrics, but also the contribution of ideas for mitigating this dilemma. However a solution will rather be a combination of technological, economical and legal means than a purely technical solution.

  • 66.
    Berthold, Stefan
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Böhme, Rainer
    Valuating Privacy with Option Pricing Theory2010In: Economics of Information Security and Privacy / [ed] Tyler Moore, David Pym, and Christos Ioannidis, New York: Springer , 2010, p. 187-193Chapter in book (Refereed)
    Abstract

    One of the key challenges in the information society is responsible handling of personal data. An often-cited reason why people fail to make rational decisions regarding their own informational privacy is the high uncertainty about future consequences of information disclosures today. This chapter builds an analogy to financial options and draws on principles of option pricing to account for this uncertainty in the valuation of privacy. For this purpose, the development of a data subject's personal attributes over time and the development of the attribute distribution in the population are modelled as two stochastic processes, which fit into the Binomial Option Pricing Model (BOPM). Possible applications of such valuation methods to guide decision support in future privacy-enhancing technologies (PETs) are sketched

  • 67.
    Berthold, Stefan
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Böhme, Rainer
    Berkley Business College, Oviedo, Spain.
    Valuating Privacy with Option Pricing Theory2010In: Economics of Information Security and Privacy / [ed] Tyler Moore, David Pym, Christos Ioannidis, London: Springer , 2010, p. 187-210Conference paper (Refereed)
  • 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. Bezzi, Michele
    et al.
    Duquenoy, Penny
    Fischer-Hübner, Simone
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Hansen, Marit
    Zhang, Ge
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Privacy and Identity Management for Life: 5th IFIP WG 9.2, 9.6/11.4, 11.6, 11.7/PrimeLife International Summer School, Nice, France, September 7-11, 2009, Revised Selected Papers2010Book (Refereed)
  • 70.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Documentation Methods and Reusability: an Experimental Evaluation2004Conference paper (Refereed)
    Abstract [en]

    This document presents an experimental evaluation carried out during the summer of 2003 in an academic environment. The goal of the experiment was to compare how different methods of documenting semantic information affect software reuse. More specifically, we wanted 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 experimental setup used was a factorial design with documentation method as the treatment, and with test persons and assignments as blocking variables. The results indicate that executable contracts demanded more time than the other three methods and that sequence diagrams and Javadoc demanded the least time. ANOVA-tests on the data indicates that there were statistically significant differences between the methods

  • 71.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Experimental Evaluation of Semantic-based Programming2003Conference paper (Refereed)
    Abstract [en]

    This paper deals with semantic-based programming and presents two experiments, one executed and one planned where the aim is to see what benefits a semantic-based program development method would bring. The first experiment was 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 computer science students who were to solve an assignment in groups of four. Half of the groups used the contract-based method and the other half used the exception-based method. 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. The main problems of this experiment were too few data points, diversity in competence and ethical considerations. These problems all contribute to the statistically weak results. The last part of this paper presents a planned experiment where the problems in the first experiment hopefully will be remedied. This part is the main new contribution of the paper and is thought of as a starting point for discussions and not as a finished product or paper. The first part of the paper has been published before in a longer version, but is included for background and reference

  • 72.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Handling of Semantic Aspects in Academia and Industry - A Taxonomy and Case Study2005Conference paper (Refereed)
    Abstract [en]

    Handling semantic aspects of a software system is one important issue in software development along with developing code and managing the organization and process. Code related issues has been thoroughly researched throughout the years as has process/organization related issues in more recent years. The semantic level inbetween has also had its share of contributions, but to a lesser extent than the two other levels. The paper presents some insight into how semantic issues are handled in both academia and industry. It presents a taxonomy based on literature studies of research papers for the academic part, and a case study that gives some insight into the work on semantic issues in industry

  • 73.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Is Scrum and XP suitable for CSE Development?2010Conference paper (Refereed)
    Abstract

    This article discusses the question if Scrum and XP is well suited for development of Computational Science and Engineering (CSE) software. The reason for choosing Scrum and XP is based on two facts. Firstly, CSE developers are not used to formal processes for software development and Scrum and XP are informal in nature, hence easier to adopt. Secondly CSE projects are often once-off and aimed at producing scientific results rather than commercial software, so the overhead of a process or methodology needs to be kept at a minimum. Scrum and XP are focused on producing software, thus keeping everything else, i.e. the overhead to a minimum, a fact that benefits CSE development. In this article, the characteristics of Scrum and XP in particular and agile development in general are evaluated against the needs of CSE developers. The results show that almost all the key points in both methodologies are well suited for CSE development and that agile development in general is a good match with CSE

  • 74.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Metodbeskrivning för pilotexperiment. ("Method Description for Pilot Experiment")1999Report (Other academic)
  • 75.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Semantic Aspects in Software Development2002Licentiate thesis, monograph (Other academic)
    Abstract [en]

    This thesis presents research on how to raise the quality of software by helping developers focus on semantic aspects during the development process. Our research has so far been concentrated on software design, impolementation, testing and maintenance, but we believe that the ideas are applicable to other phases as well. The need for methods that better support software developers when working with semantic aspects was initially found in some of our industrial surveys. In these, we tried to evaluate the documentation for real software artefacts and found that semantic aspects were not handled as well as other aspects. To remedy this, we have developed an industrially applicable method that helps the developer focus on issues related to semantics. The method has been tested in a controlled experiment in a university course to evaluate its effects on the development process and the resulting product. The initial experiences of using the method were positive and the results indicate that it is possible to introduce a focus on semantics without any large overhead and still profit from higher quality software. In summary, we believe that improving the semantic aspects will improve the quality of the development process and of the resulting software

  • 76.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Semantic Aspects in Software Development2002Report (Other academic)
  • 77.
    Blom, Martin
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Semantic Integrity in Programming Industry. (Master's Dissertation)1997Other (Other (popular science, discussion, etc.))
  • 78.
    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)
  • 79.
    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

  • 80.
    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

  • 81.
    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

  • 82.
    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)
  • 83.
    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)
  • 84.
    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)
  • 85.
    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.
    Ross, Donald F
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Jonsson, E.
    Using Quality Criteria in Programming Industry: A Case Study1998Conference paper (Refereed)
  • 86.
    Blom, Martin
    et al.
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Computer Science.
    Öfverberg, Johan
    Karlstad University, Faculty of Economic Sciences, Communication and IT, Department of Information Systems and Project Management.
    Combining Contract-Based Development and Test-Driven Development2009In: / [ed] Hamid R. Arabnia, Hassan Reza, CSREA Press , 2009Conference paper (Refereed)
    Abstract

    Contract-based Development and Test-Driven Development are two techniques for handling and avoiding software errors. They are generally not combined and we have studied the processes associated with the techniques to

    see how this combination could be done. We have found possible ways to move to and from both processes and some benefits for both ways. Moving from contracts to test cases is rather straight forward due to the completeness of the contracts, whereas moving from test cases to contracts demand some more work since the test cases are only examples of usage.

  • 87. 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)
  • 88.
    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.

  • 89. 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)
  • 90. 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)
  • 91. 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)
  • 92. 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)
  • 93. 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)
  • 94. 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)
  • 95. 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

  • 96.
    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)
  • 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.
    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

  • 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.
    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)
  • 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.
    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)
  • 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.
    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++

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