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  • 1.
    Andersson, Anders-Petter
    et al.
    Högskolan Kristianstad, Sektionen för Hälsa och Samhälle.
    Cappellen, Birgitta
    The Oslo School of Architecture and Design.
    Same but different: composing for interactivity2008Inngår i: Audio Mostly Conference: A Conference on Interaction with Sound, October 22-23 2011, Luleå University, Interactive Institute, Sonic, 2008, 80-85 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Based on experiences from practical design work, we try to show, what we believe, are the similarities and differences, between composing music for interactive media compared to linear music. In our view, much is the same, built on traditions that have been around for centuries within music and composition. The fact that the composer writes programming code is an essential difference. Instead of writing one linear work, he creates infinite numbers of potential musics that reveal themselves as answers to user interactions in many situations. Therefore, we have to broaden our perspectives. We have to put forward factors that earlier was implicit in the musical and music making situations, no matter if it was the concert hall, the church, or the club. When composing interactive music we have to consider the genre, the potential roles the listener might take, and the user experience in different situations.

  • 2.
    Atxutegi, Eneko
    et al.
    Spanien.
    Grinnemo, Karl-Johan
    Karlstads universitet.
    Izurza, Andoni
    Spanien.
    Arvidsson, Åke
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    On the move with TCP in current and future mobile networks2017Inngår i: Proceedings of the 8th International Conference on the Network of the Future, London, United Kingdom, November 2017, 2017Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Mobile wireless networks constitute an indispensable part of the global Internet, and with TCP the dominating transport protocol on the Internet, it is vital that TCP works equally well over these networks as over wired ones. This paper identifies the performance dependencies by analyzing the responsiveness of TCP NewReno and TCP CUBIC when subject to bandwidth variations related to movements in different directions. The presented evaluation complements previous studies on 4G mobile networks in two important ways: It primarily focuses on the behavior of the TCP congestion control in medium- to high-velocity mobility scenarios, and it not only considers the current 4G mobile networks, but also low latency configurations that move towards the overall potential delays in 5G networks. The paper suggests that while both CUBIC and NewReno give similar goodput in scenarios where the radio channel continuously degrades, CUBIC gives a significantly better goodput in scenarios where the radio channel quality continuously increases. This is due to CUBIC probing more aggressively for additional bandwidth. Important for the design of 5G networks, the obtained results also demonstrate that very low latencies are capable of equalizing the goodput performance of different congestion control algorithms. Only in low latency scenarios that combine both large fluctuations of available bandwidths and a mobility pattern in which the radio channel quality continuously increases can some performance differences be noticed.

  • 3.
    Bao, Leiming
    et al.
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    Sun, Chunyan
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    Human-Computer Interaction in a Smart House2012Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The quality attribute concerning usability is generally of significant importance to systems. The area of Human Computer Interaction, HCI, especially handles several usability aspects. This degree project emphasizes HCI in a context of, so called, Smart House. The report is divided into three main sections: theory, application, and measurement results. In the theory section we will present about the context of HCI and the content of HCI, such as HCI model and goals of HCI design. In the application section we discuss the use of mobile phones as a device to remotely control devices of smart houses, and present a system developed to support such services. In order to make the system more attractive, we decided to design it for two categories of operations, menu operation and direct-touch operation mode. Finally, we have used questionnaires for reasons of measuring user satisfaction. Through investigation and analysis of the result of this, we come to the conclusion that system usability is good.

  • 4.
    Carlsson, Bengt
    et al.
    Blekinge Institute of Technology.
    Jönsson, K. Ingemar
    Lund University.
    Differences between the iterated prisoner's dilemma and the chicken game under noisy conditions2002Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The prisoner's dilemma has evolved into a standard game for analyzing the success of cooperative strategies in repeated games. With the aim of investigating the behavior of strategies in some alternative games we analyzed the outcome of iterated games for both the prisoner's dilemma and the chicken game. In the chicken game, mutual defection is punished more strongly than in the prisoner's dilemma, and yields the lowest fitness. We also ran our analyses under different levels of noise. The results reveal a striking difference in the outcome between the games. Iterated chicken game needed more generations to find a winning strategy. It also favored nice, forgiving strategies able to forgive a defection from an opponent. In particular the well-known strategy tit-for-tat has a poor successrate under noisy conditions. The chicken game conditions may be relatively common in other sciences, and therefore we suggest that this game should receive more interest as a cooperative game from researchers within computer science.

  • 5.
    Chen, Eric Zhi
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Constructions of 2-generator quasi-cyclic codes2006Inngår i: Proceedings of the tenth International Workshop on Algebraic and Combinatorial Coding Theory, Zvenigorod: Institute of Information Transmission Problems of Russian Academy of Sciences , 2006, 60-63 s.Konferansepaper (Fagfellevurdert)
  • 6.
    Chen, Eric Zhi
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Constructions of quasi-cyclic two-weigh codes2006Inngår i: Proc. of the tenth International Workshop on Algebraic and Combinatorial Coding Theory (ACCT-10), 2006, 56-59 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    As a generalization of cyclic codes, quasi-cyclic (QC) codes contain many good linear codes. But quasi-cyclic codes studied so far are mainly limited to one generator (1-generator) QC codes. In this paper, 2-generator QC codes are studied, and many good 2-generator QC codes are constructed using simplex codes. A computer algorithm is given, and used to find the best possible 2-generator QC codes. Among those 2-generator QC codes constructed, some codes are two-weight codes.

  • 7.
    Chen, Eric Zhi
    Linköping university.
    Further results on difference triangle sets1994Inngår i: IEEE Transactions on Information Theory, ISSN 0018-9448, E-ISSN 1557-9654, Vol. 40, nr 4, 1268-1270 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Further results on the upper bounds for difference tri8nglesets (DTS) are derived from disjoint difference sets and additive sequencesof permutations, whit3 greatly improve the known bounds.

  • 8.
    Chen, Eric Zhi
    Högskolan Kristianstad, Institutionen för teknik.
    Good quasi-cyclic codes derived from irreducible cyclic codes2005Inngår i: Proceedings of Optimal Codes and Related Topics (OC2005), 2005, 74-81 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    As a generalization of cyclic codes, quasi-cyclic codes contain many good linear codes. Extensive search is made and lots of good quasi-cyclic codes are obtained from irreducible cyclic codes. A new binary [95, 13, 40] code which improves the lower bound on the minimum distance, is also constructed.

  • 9.
    Chen, Eric Zhi
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    New binary h-generator quasi-cyclic codes by augmentation and new minimum distance bounds2016Inngår i: Designs, Codes and Cryptography, ISSN 0925-1022, E-ISSN 1573-7586, Vol. 80, nr 1, 1-10 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    An [n, k, d] code is a binary linear code of block length n, dimension k and minimum Hamming distance d. Since the minimum distance determines the error detection or correction capability, it is desired that d is as large as possible for the given block length n and dimension k. One of the most fundamental problems in coding theory is to construct codes with best possible minimum distances. This problem is very difficult in both theory and practice. During the last decades, it has proved that the class of quasi-cyclic (QC) codes contain many such codes. In this paper, augmentation of binary QC codes is studied. A new augmentation algorithm is presented, and 10 new h-generator QC codes that are better than previously known code have been constructed. Furthermore, Construction X has been applied to obtain another 18 new improved binary linear codes.With the standard construction techniques, a total of 124 new binary linear codes that improve the lower bound on the minimum distance have been obtained.

  • 10.
    Chen, Eric Zhi
    Högskolan Kristianstad, Institutionen för teknik.
    New constructions of a family of 2-generator quasi-cyclic two-weight codes and related codes2007Inngår i: Proc. of 2007 IEEE Internat. Symp. on Inform. Theory, Piscataway, NJ: IEEE , 2007, 2191-2195 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Based on cyclic simplex codes, a new construction of a family of two-weight codes is given. These two-weight codes are in a simple 2-generator quasi-cyclic form. Based on this construction, new optimal binary quasi-cyclic [195, 8, 96], [210, 8, 104] and [240, 8, 120] codes, good QC ternary  [195, 6, 126], [208, 6, 135], [221, 6, 144] codes are thus obtained. It was also shown that some codes that meet the Griesmer bound and thus are optimal. Furthermre, binary  self-complementary codes in a 3-generator quasi-cyclic form,  are also constructed.

  • 11.
    Chen, Eric Zhi
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    New constructions of combinatorial designs and related codes2002Inngår i: Proceedings of the 8th International Workshop on Algebraic coding and Combinatorial Theory (ACCT-VIII), 2002, 264-267 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    New constructions of Steiner systems, majority logic decodable codes, and constant weight codes are presented. Comparisons with known results as well as examples are also given.

  • 12.
    Chen, Eric Zhi
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    New results on binary quasi-cyclic codes2000Inngår i: 2000 Ieee International Symposium on Information Theory: Proceedings, IEEE conference proceedings, 2000, 197- s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Twelve new binary quasi-cyclic codes, which improve the lower bounds on minimum distances for binary linear codes, are presented, and a Web database on best-known binary quasi-cyclic codes is constructed for public access.

  • 13.
    Chen, Eric Zhi
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Quasi-cyclic codes derived from cyclic codes2004Inngår i: Proceedings of Int. Symp. on Information Theory and its Applications (ISITA2004), Parma, Italy, 2004, 162-165 s.Konferansepaper (Fagfellevurdert)
  • 14.
    Chen, Eric Zhi
    Linköping university.
    Six new binary quasi-cyclic codes1994Inngår i: IEEE Transactions on Information Theory, ISSN 0018-9448, E-ISSN 1557-9654, Vol. 40, nr 5, 1666-1667 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Six new quasi-cyclic codes are presented, which improve thelower bounds on the minimum distance for a binary code. A localexhaustive search is used to find these codes and many other quasi-cycliccodes which attain the lower bounds.

  • 15.
    Chen, Eric Zhi
    et al.
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Nuh, Aydin
    USA.
    New quasi-twisted codes over F11— minimum distance bounds and a new database2015Inngår i: Journal of Information and Optimization Sciences, ISSN 0252-2667, E-ISSN 2169-0103, Vol. 36, nr 1-2, 129-157 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One fundamental and challenging problem in coding theory is to optimize the parameters [nk,d] of a linear code over the finite field Fq and construct codes with best possible parameters. There are tables and databases of best-known linear codes over the finite fields of size up to 9 together with upper bounds on the minimum distances. Motivated by recent works on codes over F11, we present a table of best-known linear codes over F11 together with upper bounds on minimum distances. Our table covers the range n ≤ 150 for the length, and 3 ≤ k ≤ 7 for the dimension. To the best of our knowledge, this is the first time such a table is presented in the literature. For the construction of the best-known codes, we employed an iterative heuristic search algorithm to search for new linear codes in the class of quasi-twisted (QT) codes. The search yielded many new codes with better parameters than previously known codes. In many cases, optimal codes are obtained. In addition to presenting a comprehensive table of best-known codes over F11 of dimensions up to 7 with upper bounds on the minimum distances, we also present separate tables for the optimal codes and new QT codes over F11. We hope that this work will be a useful source for further study on codes over F11.

  • 16.
    Chen, Wende
    et al.
    Academia Sinica and Key State Lab. of Information Security, Graduate School of Academia Sinica, Institute of Systems Science, Beijing.
    Chen, Eric Zhi
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Klove, Torleiv
    Department of Informatics, University of Bergen.
    New constructions of disjoint distinct difference sets1998Inngår i: Designs, Codes and Cryptography, ISSN 0925-1022, E-ISSN 1573-7586, Vol. 15, nr 2, 157-165 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    New constructions of regular disjoint distinct difference sets (DDDS) are presented. In particular,multiplicative and additive DDDS are considered.

  • 17.
    ChenReddy, Suresh Reddy
    et al.
    Högskolan Kristianstad, Institutionen för teknik.
    Mirza, Akbar Ali Baig
    Högskolan Kristianstad, Institutionen för teknik.
    SMS Based Pull Campaign Processing System2007Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    SMS based pull campaign processing system is a new model of directory service provided in mobile infrastructure basically to enable SMS based directory services Mobile directory services is a brand new phenomenon, which hold strong promises to become the best targeting advertising medium delivering new means of services to users with message other than traditional channels (e.g.: print, television, radio and email etc).The main purpose of this system is to bring customers and business organizations closer .It enables SMS based directory services. It not only acts as directory services but also as an advertising medium between the user and the business organizations.

  • 18.
    Davidsson, Paul
    et al.
    School of Engineering, Blekinge Institute of Technology.
    Holmgren, Johan
    School of Engineering, Blekinge Institute of Technology.
    Kyhlbäck, Hans
    School of Engineering, Blekinge Institute of Technology.
    Mengistu, Dawit
    School of Engineering, Blekinge Institute of Technology.
    Persson, Marie
    School of Engineering, Blekinge Institute of Technology.
    Applications of agent based simulation2007Inngår i: Multi-agent-based simulation VII: International workshop, MABS 2006, Hakodate, Japan, May 8, 2006, revised and invited papers / [ed] Luis Antunes & Keiki Takadama, Berlin: Springer Berlin/Heidelberg, 2007, 15-27 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper provides a survey and analysis of applications of Agent Based Simulation (ABS). A framework for describing and assessing the applications is presented and systematically applied. A general conclusion from the study is that even if ABS seems a promising approach to many problems involving simulation of complex systems of interacting entities, it seems as the full potential of the agent concept and previous research and development within ABS often is not utilized. We illustrate this by providing some concrete examples. Another conclusion is that important information of the applications, in particular concerning the implementation of the simulator, was missing in many papers. As an attempt to encourage improvements we provide some guidelines for writing ABS application papers.

  • 19.
    Dewangga, Brian
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    Inspirational Filter Application for Fashion E-Commerce2012Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    Electronic commerce is becoming a growing industry as information technology has been gradually diversifying the business industry. As a result, there is greater competition between online businesses to attract and retain customers. To overcome this challenge, it is proposed that by implementing a new Inspirational Filter Application to a company’s web store’s filter will increase the growth of returning costumers. This new application is based on loose filters, which goes beyond traditional sorting mechanisms based on color and size. This technology expands searches into inspirational categories such as occasion, material and style, allowing the customer to online shop with greater variety and efficiency. By developing this application alongside with Scandinavian web shop, Boozt Fashion AB, the success rate is tracked after the establishment of this application.

  • 20.
    Dittrich, Yvonne
    et al.
    Danmark.
    Rönkkö, Kari
    Blekinge Institute of Technology.
    Eriksson, Jeanette
    Blekinge Institute of Technology.
    Hansson, Christina
    Blekinge Institute of Technology.
    Lindeberg, Olle
    Blekinge Institute of Technology.
    Cooperative method development: combining qualitative empirical research with method, technique and process improvement2008Inngår i: EMPIRICAL SOFTWARE ENGINEERING, ISSN 1382-3256, Vol. 13, nr 3, 231-260 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The development of methods tools and process improvements is best to be based on the understanding of the development practice to be supported. Qualitative research has been proposed as a method for understanding the social and cooperative aspects of software development. However, qualitative research is not easily combined with the improvement orientation of an engineering discipline. During the last 6 years, we have applied an approach we call 'cooperative method development', which combines qualitative social science fieldwork, with problem-oriented method, technique and process improvement. The action research based approach focusing on shop floor software development practices allows an understanding of how contextual contingencies influence the deployment and applicability of methods, processes and techniques. This article summarizes the experiences and discusses the further development of this approach based on several research projects in cooperation with industrial partners.

  • 21.
    Dyba, Tore
    et al.
    Norge.
    Prikladnicki, Rafael
    Brasilien.
    Rönkkö, Kari
    Blekinge Institute of Technology.
    Seaman, Carolyn
    USA.
    Sillito, Jonathan
    Canada.
    Qualitative research in software engineering2011Inngår i: EMPIRICAL SOFTWARE ENGINEERING, ISSN 1382-3256, Vol. 16, nr 4, 425-429 s.Artikkel i tidsskrift (Fagfellevurdert)
  • 22.
    Einarson, Daniel
    et al.
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Saplacan, Diana
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    A participatory action research approach to developing assistive technologies for people suffering from cognitive disorders2014Inngår i: Abstract book: 6th Living Knowledge Conference April 9-11, 2014 / [ed] Søsser Brodersen, Jens Dorland and Michael Søgaard Jørgensen, 2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Cognitive disorders, such as disorders on the autistic spectrum, Downs’s syndrome, etc. often imply significant constraints on communication between persons suffering from those, and the environment where they act. Meanwhile, governmental propositions on human rights emphasize equality concerning information, where overcoming such interaction challenges should be considered as strongly encouraged. This contribution discusses studies that have been performed towards municipalities, public institutions, and non-profit organizations, in southern Sweden. The studies aim to involve users throughout the development of an innovative concept of communication assistive software technology, by involving multiple types of users, such as: persons with disabilities, personal assistants, teachers for students with special needs, academics, and others. The studies and the resulted findings are discussed in regard to the participatory action research framework.

  • 23.
    Einarson, Daniel
    et al.
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Wendin, Karin
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Praktisk-estetiska ämnen. Sveriges Tekniska Forskningsinstitut SP.
    Saplacan, Diana
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Learning structures of CDIO based projects in contexts of Demola2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Academia plays a main role in knowledge discovery and dissemination of knowledge. Amongst the fundamental reasons behind university education lies preparing students to use and contribute with that knowledge within contexts of industry, as well as society in large. We here see three types of actors, i.e., universities, students, and industry, which by several reasons all are gained by close cooperation already in university education. Quite often though we see a gap between education and possible student recruitment. Here, the value of being employable increases through work based projects supported by education. Even though we can see willingness according such kind of cooperation from both academia and industry, experiences show that there are barriers towards actually implementing this. That may in turn depend on common lack of knowledge on how to establish university-industry connections, and how to negotiate on student involvement, ownership of work, etc. Conclusions therefore show a need for an established organization that mediates between academia and industry, and that have well developed structures for project workflow, project result ownership, etc. Demola may here have that role as an award winning platform for industry driven projects with focus on students. Demola provides a win-win-win relationship between university, students, and industry, and has clear structures for cooperation between those. Experiences have shown that Demola is promising as a mediator, as well as a provider of multi-disciplinary industry close projects, where those may be plugged into educational programs in suitable ways. This contribution will provide an overview of Demola as a platform for industry close student projects. Demola may furthermore be used as a platform for research projects. Experiences will here be covered as a concrete example on a Demola student project. Moreover, learning outcomes in contexts of CDIO Syllabus, evaluations, and corresponding CDIO-standards, will be presented.

  • 24.
    Faraon, Montathar
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Webbutveckling med PHP och MySQL2016 (oppl. 2)Bok (Annet vitenskapelig)
    Abstract [sv]

    PHP är ett av de ledande programmeringsspråken för webbutveckling. Det är ett flexibelt och enkelt språk som används för att skapa dynamiska webbplatser. Denna bok ger en tillgänglig introduktion till PHP och databashantering. Läsaren får den kunskap som krävs för att snabbt utveckla egna webbapplikationer.

    Boken förutsätter inga tidigare erfarenheter av webbprogrammering. Läsaren leds framåt genom ett rikt utbud av övningar som ger möjlighet att tillämpa innehållet.

    Denna andra utgåva av boken har reviderats och uppdaterats grundligt. Bland nyheterna finns PHP 7, databashantering med PHP Data Objects (PDO), fler helhetsexempel samt kodexempel i färg.

    Webbutveckling med PHP och MySQL är avsedd för universitets- och gymnasiestudier i webbprogrammering, men är även en handbok för yrkesverksamma webbutvecklare och programmerare.

  • 25.
    Göran, Sandström
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    Procedural Sequencing: a New Form of Procedural Music Creation2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    With increased availability of smartphones, game consoles and computers with capabilities of synthesizing procedural music in real time comes the challenge of realizing new tools for generative music composition for games, inter-media art and musical live performance.This work defines a new method of creating music, “procedural sequencing”, and it presents a musical software that attempts to solve some of the design challenges of bridging interactive elements and more traditional tools for music composition. The software combines aspects of live coding with tracker sequencing.

  • 26.
    Johansson, C
    et al.
    Blekinge Institute of Technology.
    Rönkkö, Kari
    Blekinge Institute of Technology.
    Commitment as an underlying principle for learning2004Inngår i: KNOWLEDGE-BASED SOFTWARE ENGINEERING / [ed] Stefanuk, V & Kaijiri, K, 2004, 129-138 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The prevailing model of software development on which most educational programs are based is in conflict with general practice in industry. As following paper demonstrates Software Engineering education lacks an approach to teach the skills needed to master coalitions of existing recourses that are hard to control. In order to prepare students to handle unpredictable, non-technical and moving targets, an adequate curriculum is needed. Since 1990 software engineering education at Blekinge Institute of Technology has used commitment as the underlying principle for learning. This principle has made it possible to address the discrepancies between education and industry. This paper describes and evaluates our experience of using six elements of commitment in the education of software engineers.

  • 27.
    Johansson, Michael
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    The eight continent: design for an intentional surprise2013Inngår i: Proceedings: 2013 International Conference on Cyberworlds / [ed] Xiaoyang Mao, Lichan Hong, Los Alamitos: IEEE Computer Society, 2013, 232-239 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper I will present and discuss the design thinking, methods, processes and some examples of work, that demonstrates how I together with different co-creators set up a work practice, using digital 3d objects and images. That in different ways and formats helps us to explore how a database, a set of rules can be used in a dialogue with artistic work practice and how such a process can be used to create images and animation in a variety of design and art projects. The main example is a project called Conversation China that still is in its making, here we work with rather complex processes, involving several digital analogue techniques as the basis for creating the images for a 150 pieces porcelain dinner set. My interest in this work is how the intention of the artist or designer is transferred and later embedded in the procedural or algorithmic process and how this intent is organized and set up to secure an desired outcome, mixing the possibilities of the digital media object with manual editing and artistic craftsmanship. With the idea of design fiction, we continue to ask and explore how intent can be critical to the design process as well as the final result, that is rendered between the procedural techniques and the artistic intention. What this paper tries to put forward is how we designed and set up environments for working with non linear and procedural media, their different expressions and forms by using explorable prototypes and design thinking?

  • 28.
    Li, Yuesong
    et al.
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    Powell, Mark
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    HTML5, A Serious Contender to Native App Development or Not?2013Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Many desktop applications have moved away from heavy client-side programs tolighter web-based solutions served from the cloud. Mobile applications have also beentraditionally client-based in the form of native applications. With the use of HTML5,however, there is a growing shift towards web apps as opposed to native. HTML5technologies are enabling mobile apps to run in the browser with some native appfunctionality. HTML5 has received a great deal of attention since its release in 2009,there are numerous articles and discussions on the Internet. Some developers are verynegative and some are very positive towards the idea that it is a serious contender inmobile application development. This report presents research carried out to get theviews of developers as to their current use of HTML5 and how much they expect tobe developing mobile apps using HTML5 in the future. Judging by the level ofresponse gained and comments given, this is a very hot topic right now. The researchshows that HTML5 is a viable alternative to native app development but it has somelimitations and has some way to go before it could begin to replace native appdevelopment altogether.

  • 29.
    Mengistu, Dawit
    Blekinge Institute of Technology.
    Improving the performance of distributed multi-agent based simulation2011Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This research investigates approaches to improve the performance of multi-agent based simulation (MABS) applications executed in distributed computing environments.  MABS is a type of micro-level simulation used to study dynamic systems consisting of interacting entities, and in some cases, the number of the simulated entities can be very large.  Most of the existing publicly available MABS tools are single-threaded desktop applications that are not suited for distributed execution.  For this reason, general-purpose multi-agent platforms with multi-threading support are sometimes used for deploying MABS on distributed resources.  However, these platforms do not scale well for large simulations due to huge communication overheads.  In this research, different strategies to deploy large scale MABS in distributed environments are explored, e.g., tuning existing multi-agent platforms, porting single-threaded MABS tools to distributed environment, and implementing a service oriented architecture (SOA) deployment model.

    Although the factors affecting the performance of distributed applications are well known, the relative significance of the factors is dependent on the architecture of the application and the behaviour of the execution environment. We developed mathematical performance models to understand the influence of these factors and, to analyze the execution characteristics of MABS.  These performance models are then used to formulate algorithms for resource management and application tuning decisions.

    The most important performance improvement solutions achieved in this thesis include: predictive estimation of optimal resource requirements, heuristics for generation of agent reallocation to reduce communication overhead and, an optimistic synchronization algorithm to minimize time management overhead.  Additional application tuning techniques such as agent directory caching and message aggregations for fine-grained simulations are also proposed.  These solutions were experimentally validated in different types of distributed computing environments.

    Another contribution of this research is that all improvement measures proposed in this work are implemented on the application level.  It is often the case that the improvement measures should not affect the configuration of the computing and communication resources on which the application runs.  Such application level optimizations are useful for application developers and users who have limited access to remote resources and lack authorization to carry out resource level optimizations.

  • 30.
    Mengistu, Dawit
    Blekinge Tekniska Högskola.
    Multi-agent based simulations in the grid environment2007Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The computational Grid has become an important infrastructure as an execution environment for scientific applications that require large amount of computing resources.  Applications which would otherwise be unmanageable or take a prohibitively longer execution time under previous computing paradigms can now be executed efficiently on the Grid within a reasonable time.

    Multi-agent based simulation (MABS) is a methodology used to study and understand the dynamics of real world phenomena in domains involving interaction and/or cooperative problem solving where the participants are characterized by entities having autonomous and social behaviour.  For certain domains the size of the simulation is extremely large, intractable without employing adequate computing resources such as the Grid. 

    Although the Grid has come with immense opportunities to resource demanding applications such as MABS, it has also brought with it a number of challenges related to performance.  Performance problems may have their origins either on the side of the computing infrastructure or the application itself, or both. 

    This thesis aims at improving the performance of MABS applications by overcoming problems inherent to the behaviour of MABS applications.  It also studies the extent to which the MABS technologies have been exploited in the field of simulation and find ways to adapt existing technologies for the Grid.  It investigates performance monitoring and prediction systems in the Grid environment and their implementation for MABS application with the purpose of identifying application related performance problems and their solutions.

    Our research shows that large-scale MABS applications have not been implemented despite the fact that many problem domains that cannot be studied properly with only partial simulation.  We assume that this is due to the lack of appropriate tools such as MABS platforms for the Grid.  Another important finding of this work is the improvement of application performance through the use of MABS specific middleware.

  • 31.
    Mengistu, Dawit
    et al.
    Department of Systems & Software Engineering, Blekinge Institute of Technology.
    Davidsson, Paul
    Department of Systems & Software Engineering, Blekinge Institute of Technology.
    Lundberg, Lars
    Department of Systems & Software Engineering, Blekinge Institute of Technology.
    A grid based simulation environment for mobile distributed applications2007Inngår i: 2007 International Conference on Multimedia and Ubiquitous Engineering: proceedings: MUE 2007: 26-28 April, 2007, Seoul, Korea / [ed] Kim, S.S.; Park, J.H.; Pissinou, N.; Kim, T.H.; Fang, W.C.; Slezak, D.; Arabnia, H.R.; Howard, D., Los Alamitos, Calif.: IEEE Computer Society, 2007, 1093-1099 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Using simulation environments to support mobile distributed application development has many benefits. Since mobile devices can be modeled as autonomous intelligent agents, the multi agent based simulation (MABS) approach is useful for such applications. In this paper, we propose a MABS platform on the computational Grid for mobile distributed computing. A prototype of the proposed platform is implemented and its performance characteristics are studied The findings of the experiment show that a Grid based MABS platform can provide a scalable simulation environment for mobile distributed applications.

  • 32. Mengistu, Dawit
    et al.
    Davidsson, Paul
    Lundberg, Lars
    Approaches to distributed multi-agent based simulationArtikkel i tidsskrift (Fagfellevurdert)
  • 33.
    Mengistu, Dawit
    et al.
    Department of Systems and Software Engineering, School of Engineering, Blekinge Institute of Technology.
    Davidsson, Paul
    Department of Systems and Software Engineering, School of Engineering, Blekinge Institute of Technology.
    Lundberg, Lars
    Department of Systems and Software Engineering, School of Engineering, Blekinge Institute of Technology.
    Middleware support for performance improvement of MABS applications in the Grid environment2008Inngår i: Multi-agent-based simulation VIII: International workshop, MABS 2007, Honolulu, HI, USA, May 15, 2007, revised and invited papers / [ed] Luis Antunes, Mario Paolucci & Emma Norling, Berlin: Springer Berlin/Heidelberg, 2008, 20-35 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The computational Grid is an infrastructure which enables the execution of applications demanding huge computing resources. Hence, it can be the right environment for large-scale Multi-agent based simulation (MABS) applications. However, due to the nature of the Grid and the characteristics of MABS, achieving optimum performance poses a great challenge. Performance study of MABS applications is therefore a necessary undertaking which requires an understanding of these characteristics and the extent of their influence. Moreover, owing to the dynamicity and heterogeneity of the Grid, it is difficult to achieve performance gains without a middleware support for application deployment and dynamic reconfiguration. This paper presents a study of the key features of MABS applications that affect performance and proposes a supportive middleware to MABS platforms. Experiments show that the proposed middleware can bring performance improvement for MABS applications on the Grid.

  • 34. Mengistu, Dawit
    et al.
    Davidsson, Paul
    Lundberg, Lars
    Migration heuristics and performance models for distributed multi-agent based simulationsArtikkel i tidsskrift (Fagfellevurdert)
  • 35. Mengistu, Dawit
    et al.
    Davidsson, Paul
    Lundberg, Lars
    Tröger, Peter
    Performance modeling and optimization of agent based simulations in distributed environment2009Inngår i: Proceedings of The Social Simulation Workshop at the International joint Conference on Artificial Intelligence, 2009, 79-92 s.Konferansepaper (Fagfellevurdert)
  • 36. Mengistu, Dawit
    et al.
    Lundberg, Lars
    Survey of Grid monitoring tools for domain specific middlewareRapport (Annet vitenskapelig)
  • 37. Mengistu, Dawit
    et al.
    Lundberg, Lars
    Davidsson, Paul
    Performance prediction of multi-agent based simulation applications on the Grid2007Inngår i: Proceedings of World Academy of Science Engineering and Technology. Vol. 21, 2007, 103-108 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A major requirement for Grid application developers is ensuring performance and scalability of their applications. Predicting the performance of an application demands understanding its specific features. This paper discusses performance modeling and prediction of multi-agent based simulation (MABS) applications on the Grid. An experiment conducted using a synthetic MABS workload explains the key features to be included in the performance model. The results obtained from the experiment show that the prediction model developed for the synthetic workload can be used as a guideline to understand to estimate the performance characteristics of real world simulation applications.

  • 38.
    Mengistu, Dawit
    et al.
    Blekinge Institute of Technology, Soft Center, Ronneby.
    Lundberg, Lars
    Blekinge Institute of Technology, Soft Center, Ronneby.
    Davidsson, Paul
    Blekinge Institute of Technology, Soft Center, Ronneby.
    Performance prediction of multi-agent based simulation applications on the Grid2007Inngår i: International Journal of Intelligent Technology, ISSN 1305-6417, Vol. 2, nr 3, 166-171 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A major requirement for Grid application developers is ensuring performance and scalability of their applications. Predicting the performance of an application demands understanding its specific features. This paper discusses performance modeling and prediction of multi-agent based simulation (MABS) applications on the Grid. An experiment conducted using a synthetic MABS workload explains the key features to be included in the performance model. The results obtained from the experiment show that the prediction model developed for the synthetic workload can be used as a guideline to understand to ,estimate the performance characteristics of real world simulation applications.

  • 39. Mengistu, Dawit
    et al.
    Löwis, M.V.
    An algorithm for optimistic distributed simulations2009Inngår i: IASTED International Conference on Modelling, Simulation and Identification, 2009, 231-237 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Distributed simulation has traditionally suffered from synchronization constraints that reduce the speedup significantly below the theoretical maximum. One solution approach are optimistic synchronization algorithms, allowing some nodes to advance in model time. In this paper, we present a novel algorithm that does not share the typical rollback costs of optimistic simulation, at the expense of restrictions on the design of simulation models. We have implemented that algorithm in an agent-based simulation framework, and evaluate its performance gains through measurements on actual simulation models.

  • 40.
    Mengistu, Dawit
    et al.
    Blekinge Institute of Technology.
    Tröger, Peter
    Blekinge Institute of Technology.
    Performance optimization for multi-agent based simulation in Grid environments2008Inngår i: 8th IEEE International symposium on cluster computing and the Grid, 2008 / [ed] Thierry Priol, Laurent Lefevre, and Rajkumar Buyya, Los Alamitos: Ieee Computer Soc , 2008, 560-565 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Multi-agent based simulation (MABS) is a discrete event simulation technique used to study complex systems with entities having social and autonomous behavior. MABS applications are characterized by unpredictable execution behavior and high communication-to-computation ratio. In this paper, we propose an adaptation strategy to support efficient execution of large-scale MABS applications on typical Grid infrastructures. To achieve this objective, the behavior of MABS applications and the execution environment is investigated, in order to constantly obtain performance prediction models. These models will then be used to realize dynamic load balancing and resource allocation schemes. We discuss our basic approach, initial experimental results, the planned future research and an application of our research in the transportation and logistics simulation domain.

  • 41.
    Mengistu, Dawit
    et al.
    Blekinge Institute of Technology.
    Tröger, Peter
    Blekinge Institute of Technology.
    Lundberg, Lars
    Blekinge Institute of Technology.
    Davidsson, Paul
    Blekinge Institute of Technology.
    Scalability in distributed multi-agent based simulations: the JADE case2008Inngår i: Second International Conference on Future Generation Communication and Networking Symposia, 2008. Vol. 5, Los Alamitos: Ieee Computer Soc , 2008, 596, , 602 s.596-602 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Agent platforms provide a framework for development and execution of parallel applications such as multi-agent based simulation (AMBS). However, these platforms have limitations to support large-scale MABS applications in practice. This paper aims at investigating and improving the performance of an agent platform with a AMBS workload in distributed environments. We carried out an experimental study with the JADE framework as our agent platform. The experiments show the performance characteristics of the workload and that JADE does not scale well due to message transport and agent directory service limitations. We propose solutions to overcome these performance bottlenecks and facilitate the efficient execution of AMBS in a distributed environment. Initial experimental results demonstrate the feasibility of the proposed approaches.

  • 42.
    Nilsson, Lars-Erik
    et al.
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Pedagogik. Högskolan Kristianstad, Forskningsmiljön Arbete i skolan (AiS). Högskolan Kristianstad, Plattformen för forskning om verksamhetsförlagd utbildning och professionslärande.
    Eklöf, Anders
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Pedagogik. Högskolan Kristianstad, Forskningsmiljön Arbete i skolan (AiS).
    Ottosson, Torgny
    Högskolan Kristianstad, Sektionen för lärande och miljö, Avdelningen för Pedagogik. Högskolan Kristianstad, Forskningsmiljön Learning in Science and Mathematics (LISMA).
    Unstructured information as a socio-technical dilemma2008Inngår i: Handbook of research on digital information technologies: innovations, methods, and ethical issues / [ed] Hansson, Thomas, Hershey, PA: Information Science Reference , 2008, 482-505 s.Kapittel i bok, del av antologi (Annet vitenskapelig)
    Abstract [en]

    This chapter employs video data together with screen captures for presenting cases where the students try to match questions to search expressions, make decisions about whether they are allowed to visit a certain site, and examine how the students make decisions about relevance and credibility. Information always appears to be unstructured to the students and restructuring of information poses a socio-technical dilemma involving appreciation of an ideological and ethical nature.

  • 43.
    Norrman, Mikael
    Högskolan Kristianstad, Sektionen för hälsa och samhälle.
    3D-tabell för datalagring som molntjänst2012Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Projektet kretsar kring idén om en lagringsform, utformad som en tabell, som inte är bunden till en specifik plattform eller ett specifikt filsystem och som kan fungera som en molntjänst. Denna lagringsform är dessutom mer avancerad än en vanlig tabell då den innehåller tre dimensioner.Idén kom till under en föreläsning om molntjänsten google app engine då det kort förklarades att de använder ett, av dem själva skapat, system som kallas för BigTable. Detta projekt liknar BigTable men skiljer sig då detta projekt är något enklare, öppen källkod samt att det är baserat på java vilket gör det plattformsoberoende.

    Syftet med projektet är skapa en enkel plattform för datalagring som kan användas som molntjänst där den underliggande tekniken lämpar sig för användning på vitt skilda system och hårdvara.Tanken med ett sådant system är att man med små medel ska kunna skapa en egen datalagring där den traditionella filservern suddas ut och det mer moderna molnkonceptet används. Genom att parkoppla servrar kan man i teorin skapa ett världsomspännande lagringsnätverk med enormt stor lagringskapacitet men är i praktiken mer inriktad på privata moln. Det spelar dock ingen roll om man enbart har en maskin eller flera hundra, för användaren kommer det alltid fungera likadant.

    Problemet som detta projekt tar sig an är det om datalagring och hur den kan lösas på ett sätt som bidrar till ökad ekonomisk vinst utan att minska på skalbarhet och användbarhet.Projektet löser även en annan viktig aspekt med datalagring vilket är versionshantering, något som andra tjänster inte erbjuder, tar bra betalt för eller som enbart finns i begränsad form.

  • 44.
    Petersen, Kai
    et al.
    Blekinge Institute of Technology.
    Rönkkö, Kari
    Blekinge Institute of Technology.
    Wohlin, Claes
    Blekinge Institute of Technology.
    The impact of time controlled reading on software inspection effectiveness and efficiency a controlled experiment2008Inngår i: ESEM'08: PROCEEDINGS OF THE 2008 ACM-IEEE INTERNATIONAL SYMPOSIUM ON EMPIRICAL SOFTWARE ENGINEERING AND MEASUREMENT, ASSOC COMPUTING MACHINERY , 2008, 139-148 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Reading techniques help to guide reviewers during individual software inspections. In this experiment, we completely transfer the principle of statistical usage testing to inspection reading techniques for the first time. Statistical usage testing relies on a usage profile to determine how intensively certain parts of the system shall be tested from the users' perspective. Usage-based reading applies statistical usage testing principles by utilizing prioritized use cases as a driver for inspecting software artifacts (e.g., design). In order to reflect how intensively certain use cases should be inspected, time budgets are introduced to usage-based reading where a maximum inspection time is assigned to each use case. High priority use cases receive more time than low priority use cases. A controlled experiment is conducted with 23 Software Engineering M.Sc. students inspecting a design document. In this experiment, usage-based reading without time budgets is compared with time controlled usage-based reading. The result of the experiment is that time budgets do not significantly improve inspection performance. In conclusion, it is sufficient to only use prioritized use cases to successfully transfer statistical usage testing to inspections.

  • 45.
    Rodríguez García, Ángel
    Högskolan Kristianstad, Institutionen för teknik.
    Workflow Management System in Java environment2007Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    This degree project deals with the study about the development of workflow applications in a Java programming environment and the developing of an application that manages a claim process. The structure of the report contains four main sections: introduction, theory, design and implementation.

    In the introduction, all the background and basic information needed is described. The theoretical part explains the concepts related to the project needed for good understanding. During the design and implementation parts, all the processes of developing the application, the difficulties and solutions found are described. Finally in the last part the Conclusions of this project and the future investigations are shown.

  • 46.
    Rönkkö, Kari
    et al.
    Blekinge Institute of Technology.
    Dittrich, Yvonne
    Danmark.
    Randall, Dave
    England.
    When plans do not work out: how plans are used in software development projects2005Inngår i: Computer Supported Cooperative Work, ISSN 0925-9724, Vol. 14, nr 5, 433-468 s.Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Based on empirical material from the area of software engineering, this articlediscusses the issue of plans and planning as an integral part of and prerequisite for software development work. It relates observed practices to literature produced by the Computer Supported Cooperative Work community. Empirical studies of software development practice seldom address re-planning. By analyzing the empirical material from one project we are able to show how certain kinds of co-ordination problems arise and how they may be dealt with. The empirical research does not focus primarily on the character of plans; instead, it raises the question ‘what means are necessary and should be provided in order to cope with situations when plans do not work out? In relation to plans, especial emphasis is on ‘‘due process’’, i.e. how the project plan and the company wide project model are maintained to enable the identification and articulation of deviations from it. On the basis of our empirical analysis we propose to support the articulation and coordination work necessary in situations where plans do not adequately work out.

  • 47.
    Rönkkö, Kari
    et al.
    Blekinge Institute of Technology.
    Lindeburg, O
    Blekinge Institute of Technology.
    Dittrich, Y
    Blekinge Institute of Technology.
    'Bad practice' or 'bad methods': are software engineering and ethnographic discourses incompatible?2002Inngår i: 2002 INTERNATIONAL SYMPOSIUM ON EMPIRICAL SOFTWARE ENGINEERING, PROCEEDINGS, 2002, 204-210 s.Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Organizational problems in industry have evoked increased interest in empirical methodologies in the broader software engineering community. In this article ethnography and its relation to software engineering is addressed. Until now sociologists have performed the majority of ethnographic studies on software development. But how useful are these studies for software engineering? Ethnography emphasizes the members' point of view in order to understand the social. Studies from the members' perspective can be interpreted, as revealing 'bad methods' that do not work in complex work situations. From a sofiware engineering point of view, they just as easy point to the opposite as 'bad practice', bad application of existing methods. The objective of this paper is to promote ethnography and its contribution to sofiware engineering by revealing the different research attitudes of ethnographers and software engineers. Possibilities how to combine ethnographic studies with software method improvement are indicated.

  • 48.
    Rönkkö, Kari
    et al.
    Lund University Internet Institute.
    Svensson, MånsLund University Internet Institute.Palmqvist, LindaLund University Commissioned Education.
    Social innovation in a digital context: change projects within the academic scholarship programme -  final reports, 2012-20132014Collection/Antologi (Annet vitenskapelig)
  • 49.
    Rönkkö, Kari
    et al.
    Blekinge Institute of Technology.
    Winter, Jeff
    Blekinge Institute of Technology.
    Hellman, Mats
    Blekinge Institute of Technology.
    Inside information 2 - usability and user research: eight years of research and method development cooperation2009Rapport (Annet vitenskapelig)
    Abstract [en]

    This report is a follow up to the Inside Information – Usability and User Research at UIQ Technology report that was made available in October 2006. The initial report was written from an industrial point of view aimed to market UIQ Technology through the demonstration of the UIQ usability and user research philosophy. UIQ Technology Usability Metrics (UTUM) was important result here. UTUM was considered an extremely cost-effective method for keeping in focus what is important for users and handset makers. It was a tool for guiding development decisions as well as for validating the worthiness of design concepts. The two parts in UTUM was perceived by the company as an innovation in their software development practice. The first part was the relationship to users and attitude to their participation in the design process. The second part was how the company immediately and directly incorporated this usability understanding into the software development process. UTUM, together with other usability methods and results presented in this report, have been produced in an action research manner. Due to the closure of the company, the main author of the 2006 report, and the same researchers who also supported the writing of the initial report, decided to produce a follow-up and closure version of the initial report; as a way to summarize the results from the academic and industrial cooperation. In this updated version, eight years of joint action research and cooperative method development surrounding usability and user research is concluded.

  • 50.
    Saplacan, Diana
    et al.
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    Einarson, Daniel
    Högskolan Kristianstad, Sektionen för hälsa och samhälle, Avdelningen för Design och datavetenskap.
    The JoyTalk approach to participatory studies on communicative and cognitive disorders2014Konferansepaper (Fagfellevurdert)
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