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  • 1.
    al-Rifaie, Fatimah Majid
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    al-Rifaie, Mohammad Majid
    Storbritannien.
    Maximising overlap score in DNA sequence assembly problem by Stochastic Diffusion Search2016In: Intelligent systems and applications: extended and selected results from the SAI Intelligent Systems Conference (IntelliSys) 2015 / [ed] Yaxin Bi,Supriya Kapoor, Rahul Bhatia, Berlin, Heidelberg: Springer Berlin/Heidelberg, 2016, 301-321 p.Conference paper (Refereed)
    Abstract [en]

    This paper introduces a novel study on the performance of Stochastic DiffusionSearch (SDS) – a swarm intelligence algorithm – to address DNA sequence assembly problem. This is an NP-hard problem and one of the primary problems in computational molecular biology that requires optimisation methodologies to reconstruct the original DNA sequence. In this work, SDS algorithm is adapted for this purpose and several experiments are run in order to evaluate the performance of the presented technique over several frequently used benchmarks. Given the promising results of the newly proposed algorithm and its success in assembling the input fragments, its behaviour is further analysed, thus shedding light on the process through which the algorithm conducts the task. Additionally, the algorithm is applied to overlap score matrices which are generated from the raw input fragments; the algorithm optimises the overlap score matrices to find better results. In these experiments realworld data are used and the performance of SDS is compared with several other algorithms which are used by other researchers in the field, thus demonstrating its weaknesses and strengths in the experiments presented in the paper.

  • 2.
    Andersson, Jens A.
    et al.
    Lund University.
    Arvidsson, Ake
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap. Ericsson AB.
    Du, Manxing
    Acreo Swedish ICT AB, Kista, Sweden.
    Zhang, Huimin
    Acreo Swedish ICT AB, Kista, Sweden.
    Kihl, Maria
    Lund University.
    Host, Stefan
    Lund University.
    Lagerstedt, Christina
    Acreo Swedish ICT AB, Kista, Sweden.
    User profiling for pre-fetching or caching in a catch-Up TV network2016In: 2016 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB), 2016Conference paper (Refereed)
    Abstract [en]

    We investigate the potential of different pre-fetching and/or caching strategies for different user behaviour with respect to surfing or browsing in a catch-up-TV network. To this end we identify accounts and channels associated with strong or weak surfing or browsing respectively and study the distributions of hold times for the different types of behaviour. Finally we present results from a request prediction model and a caching simulation for the different types of behaviour and find that the results are relatively similar.

  • 3.
    Arvidsson, Åke
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap. Ericsson AB.
    Rydén, Tobias
    Uppsala University.
    Load transients in pooled cellular core network nodes2015In: Performance evaluation (Print), ISSN 0166-5316, E-ISSN 1872-745X, Vol. 90, 18-35 p.Article in journal (Refereed)
    Abstract [en]

    The coverage areas of cellular networks are logically subdivided into service areas. Each service area has a local anchor node which “hides” the mobility inside the area and the entire network has a global anchor node which “hides” the mobility between areas.

    The concept of unique local anchor nodes per service area was invented to simplify routing but has been found to complicate expansion. The rapidly growing demand for cellular access has therefore prompted for alternative solutions with pools of local anchor nodes per service area. Such pools are now deployed by several operators all over the world.

    Users in pooled service areas are mapped to specific pool members according to a load distribution policy, but the mapping can change as a result of node failures or operator interventions. Such changes take a certain time to implement and cause additional load on the anchor nodes. We study these processes in detail and derive closed form expressions which allow operators to control the trade-off between rapid changes and acceptable loads.

    Finally we show that the key assumptions of our model are in agreement with measured data and demonstrate how the model can be applied to investigate the effects of different network settings (timers) under different user behaviour (traffic and mobility).

    Contrary to current solutions to this problem, which typically are slow and/or inaccurate, our results enable fast and accurate analysis of different scenarios thereby enabling operators to maximise utilisation of the existing investments and at the same time avoid potentially dangerous situations of overload.

  • 4.
    Atxutegi, Eneko
    et al.
    Spanien.
    Grinnemo, Karl-Johan
    Karlstads universitet.
    Izurza, Andoni
    Spanien.
    Arvidsson, Åke
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    On the move with TCP in current and future mobile networks2017In: Proceedings of the 8th International Conference on the Network of the Future, London, United Kingdom, November 2017, 2017Conference paper (Other academic)
    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.

  • 5.
    Atxutegi, Eneko
    et al.
    Spanien.
    Liberal, Fidel
    Spanien.
    Grinnemo, Karl-Johan
    Karlstad University.
    Brunström, Anna
    Karlstad University.
    Arvidsson, Åke
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap. Ericsson AB.
    Robert, Rèmi
    Ericsson AB.
    TCP behaviour in LTE: impact of flow start-up and mobility2016In: Wireless and Mobile Networking Conference (WMNC), 2016 9th IFIP, IEEE Communications Society, 2016, 73-80 p.Conference paper (Refereed)
    Abstract [en]

    Mobile internet has been widely adopted and it is expected to rise to almost 4 billion users by 2020. Despite the research effort dedicated to the enhancement of its performance, there still exists a gap in the understanding of how TCP and its many variants work over LTE. To this end, this paper evaluates the extent to which five common TCP variants, CUBIC, NewReno,Westwood+, Illinois, and CAIA Delay Gradient (CDG), are able to utilise available radio resources under hard conditions, such as during start-up and in mobile scenarios at different speeds. The paper suggests that CUBIC, due to its Hybrid Slow-Start mechanism, enters congestion avoidance prematurely, and thus experiences a prolonged start-up phase. As a result, it is unable to efficiently utilise radio resources during shorter transmissionsessions. Besides, CUBIC, Illinois and NewReno, i.e., the loss-based TCP implementations, offer better throughput, and are able to better utilise available resources during mobility than Westwood+ and CDG - the delay-based variants do.

  • 6.
    Braco, Veletanlic
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Flipped classroom approach and its implementation in an online course2016In: Lärarlärdom 2016: Högskolan Kristianstad / [ed] Claes Dahlqvist & Stefan Larsson, Högskolan Kristianstad: Kristianstad University Press , 2016Conference paper (Other academic)
    Abstract [en]

    Active learning is the process where students learn beyond passively listening to an instructor's lecture. In this way students are engaged in their learning activities. It has been accepted that active learning leads to deeper understanding and better learning outcomes.

    The term flipped classroom has been widely used to describe a new pedagogical approach in which traditional lecture and homework elements of a course are reversed so that the initial exposure to the learning content takes place outside of the classroom. This approach frees up class time, promotes active learning and engagement in learning and facilitates student-centered learning.

    In this study we experimented with flipped classroom approach in the online course Programming in C during the autumn term 2015. The purpose of the experiment was to determine whether flipped classroom can serve as an appropriate method to use in an online course and to find out to what extent flipped classroom can stimulate active learning in an online setting. Based on known concept of flipped classroom approach and literature review, we systematically reviewed YouTube videos and selected 52 video clips to use as companion course materials. We also compiled and produced 212 quiz questions to use as formative assessment. In order to promote interaction among the students, we experimented with peer-review as a part of the laboratory work process. We also provided scheduled online sessions in the form of chat rooms. Short video clips were positively received by the students. Even the peer-review approach was positively received but the students gave up this activity at the end of the course, due to the work load. Flipped classroom has potential to be used in online settings but distinction between "classroom" and "outside classroom" is not always clear.

    More work is needed to make this distinction visible and to make the transition between these two learning environments smooth.

  • 7.
    Braco, Veletanlic
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Klonowska, Kamilla
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Generella kompetenser och forskningsanknytning i utbildningen - en akademisk slinga för dataloger2016In: Lärarlärdom: 2015, Växjö: Linnéuniversitetet , 2016, 163-181 p.Conference paper (Other (popular science, discussion, etc.))
    Abstract [sv]

    Akademisk slinga är ett pedagogiskt begrepp som används vid Högskolan Kristianstad. Akademisk slinga har för syfte att integrera generella kompetenser och färdigheter i ämneskurser i grundutbildningar. I sin grundform ska akademisk slinga även utveckla studenternas kommunikativa förmågor och förmågan att lösa problem och arbeta i grupp. Under 2014 genomgick kandidatprogrammet i datalogi (Datasystemutvecklingsprogrammet) vid Högskolan Kristianstad en rad förändringar. En av de viktigaste drivkrafterna bakom dessa förändringar var att skapa förutsättningar för en systematisk introduktion i ett vetenskapligt förhållningssätt och på detta sätt hjälpa studenterna att utveckla kunskap om ämnets vetenskapliga grund och förmåga att orientera sig om aktuella forskningsfrågor. Utbildningen skulle få en tydligare forskningsanknytning. Akademisk slinga, som i sin grundform syftar till att fokusera på generella kompetenser, sågs som ett möjligt verktyg för att uppnå detta mål. En systematisk utveckling av generella kompetenser ansåg vi kunna skapa viktiga förutsättningar för utveckling av det vetenskapliga förhållningssättet vilket i sin tur skulle leda till att studenterna kunde tillgodogöra sig det ämnesspecifika och även uppnå utbildningens examensmål. Den akademiska slingan i datalogiprogramme tblev på så vis ett verktyg som skulle skapa en tydlig länk mellan det generella och det ämnesspecifika. För att möjliggöra detta definierades övergripande lärandemål och examinationsmoment för den akademiska slingan. Lämpliga kurser valdes ut och omarbetades avseende lärandemål och innehåll. Kursmoment som fokuserar på generella kompetenser och forskningsanknytning inkorporerades i dessa kurser med lärandemål och examinationsformer som haren tydlig relation till utbildningens övergripande lärandemål. Dessa kursmomen tutgjorde på detta vis ett tydligt, progressivt spår i utbildningen. En viktig punkt som den akademiska slingan fokuserar på är att ge studenterna möjlighet att tidigt i utbildningen bekanta sig med olika forsknings tema och forskningsprojekt. Moment med vetenskapsteori och vetenskaplig metod introduceras tidigt. Seminarium som undervisningsform används genomgående i utbildningen. Det vetenskapliga förhållningssättet medvetandegörs och konkretiseras i olika projekt och laborationer.

  • 8.
    Brandt, Eva
    et al.
    Danmark.
    Wetterstrand, Martin
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Messeter, Jörn
    Malmö högskola.
    Design Lab: re-thinking what and how to design2005In: Design spaces / [ed] Binder, Thomas and Hellström, Maria, Helsingfors: Edita Publishing Oy, 2005, 34-43 p.Chapter in book (Other academic)
    Abstract [en]

    Over the last decades there has been a dramatic change in the design agenda within the field of IT design. With the increase of mobile and wireless devices and the massive expansion of Internet availability the classic object of design - is about to vanish. Even if we conceive the setting where information technology is used as a 'system', this system can hardly be seen as the outcome of a system design process. Arguably, IT design is today guided by new design agendas. Ubiquitous computing and from the user side information ecologies seem to be more appropriate labels for the emerging technology. The objects of design has correspondingly been changing from systems to devices, tools or information appliances. This radical opening of the question of what to design has led to an apparent confusion on how to design. Just as the field of information systems is about to mature with a broad and widely accepted repertoire of design approaches and methods, ranging from workflow analysis to user involvement, this battery of approaches is loosing ground in favor of more techno-centric explorations, such as Tangible Computing. In our view there seem to be a growing divide between mainly North American contributions to IT design emphasizing new information technology concepts such as ubiquitous computing, tangible interaction and augmented reality, and mainly European contributions emphasizing the role of particular information technology applications in the light of in-depth studies of the potential contexts of use.

  • 9.
    Cappelen, Birgitta
    et al.
    Oslo School of Architecture and Design.
    Andersson, Anders-Petter
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Co-created staging: situating installations2011In: Interactive Media Arts Conference, IMAC2011, Re-new digital arts festival / [ed] Ass. Prof. Morten Søndergaard, ArT / Aalborg University, Copenhagen, 2011Conference paper (Refereed)
    Abstract [en]

    Staging is the creative act of showing something to an audience.When staging, the artist choose and create the context, situationand structure of the presented object, play or installation. The chosen context and situation provide background for the audience interpretations. Meaning is co-created between the artist and audience, based on the cultural and individual understanding of the context and situation. The term installation is open, ambiguous and undefined. One does not completely know what to expect and where to find an installation. It is open towards many interpretations. In this paper we present how we worked with staging of two interactive installations in different exhibition situations, to provoke and motivate different interpretations, expectations and interactions. We argue for staging as a communicative strategy to attract and motivate diverse audiences and user groups to collaborate and co-create through interpretation and interaction. Further we argue that installations have to be open to many possible structures, interpretations, interaction forms and roles the user can take, and shift betweendynamically. When the user dynamically restructure, shift rolesand thereby re-situate the installation, the user is a co-creator in the staging act. We call this dynamic staging.

  • 10.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    A new iterative computer search algorithm for good quasi-twisted codes2015In: Designs, Codes and Cryptography, ISSN 0925-1022, E-ISSN 1573-7586, Vol. 76, no 2, 307-323 p.Article in journal (Refereed)
    Abstract [en]

    As a generalization to cyclic and consta-cyclic codes, quasi-twisted (QT) codes contain many good linear codes. During the last twenty years, a lot of record-breaking codes have been found by computer search for good QT codes. But due to the time complexity, very few QT codes have been reported recently. In this paper, a new iterative, heuristic computer search algorithm is presented, and a lot of new QT codes have been obtained. With these results, a total of 45 entries in the code tables for the best-known codes have been improved. Also, as an example to show the effectiveness of the algorithm, 8 better binary quasi-cyclic codes with dimension 12 and m = 13 than previously best-known results are constructed.

  • 11.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Constructions of 2-generator quasi-cyclic codes2006In: 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 p.Conference paper (Refereed)
  • 12.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Constructions of quasi-cyclic two-weigh codes2006In: Proc. of the tenth International Workshop on Algebraic and Combinatorial Coding Theory (ACCT-10), 2006, 56-59 p.Conference paper (Refereed)
    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.

  • 13.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Flipped classroom model and its implementation in a computer programming course2014In: Lärarlärdom: Högskolepedagogisk Konferens 2014, Blekinge Tekniska Högskola / [ed] Christina Hansson, 2014, 180-200 p.Conference paper (Refereed)
    Abstract [en]

    The flipped classroom approach provides implementation of a student-centered learning environment. By changing the traditional classroom lectures and homework elements of a course, it facilitates active learning and higher-order understanding. This paper presents initial experiments on a flipped classroom approach and its application in a programming course. The course results and evaluation show that this approach is rewarding, and why it deserves further investigation.

  • 14.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    New binary h-generator quasi-cyclic codes by augmentation and new minimum distance bounds2016In: Designs, Codes and Cryptography, ISSN 0925-1022, E-ISSN 1573-7586, Vol. 80, no 1, 1-10 p.Article in journal (Refereed)
    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.

  • 15.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    New constructions of combinatorial designs and related codes2002In: Proceedings of the 8th International Workshop on Algebraic coding and Combinatorial Theory (ACCT-VIII), 2002, 264-267 p.Conference paper (Refereed)
    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.

  • 16.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    New results on binary quasi-cyclic codes2000In: 2000 Ieee International Symposium on Information Theory: Proceedings, IEEE conference proceedings, 2000, 197- p.Conference paper (Refereed)
    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.

  • 17.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Quasi-cyclic codes derived from cyclic codes2004In: Proceedings of Int. Symp. on Information Theory and its Applications (ISITA2004), Parma, Italy, 2004, 162-165 p.Conference paper (Refereed)
  • 18.
    Chen, Eric Zhi
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Aydin, Nuh
    USA.
    New databases of linear codes over GF(11) and GF(13)2014In: Proceedings of Karatekin mathematics days 2014: international mathematics symposium, 2014, 22-22 p.Conference paper (Refereed)
    Abstract [en]

    One central problem in coding theory is to optimize the parameters of a linear code and construct codes with best possible parameters. There are tables of best-known linear codes over nite elds of sizes up to 9. Recently, there has been a growing interest in codes over GF(11), over GF(13) and other elds of size greater than 9. The main purpose of this work is to present new databases of best-known linear codes over the elds GF(11) and GF(13) together with upper bounds on the minimum distances. To nd good linear codes to establish lower bounds on minimum distances, an iterative heuristic computer search algorithm is employed to construct quasi-twisted (QT) codes over these elds with high minimum distances. A large number of new linear codes have been found, improving previously best-known results. Tables of [pm, m] QT codes over the two elds with best-known minimum distances as well as a table of lower and upper bounds on the minimum distances for linear codes of length up to 150 and dimension up to 6 are presented.

  • 19.
    Chen, Eric Zhi
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Aydın, Nuh
    USA.
    A database of linear codes over F13 with minimum distance bounds and new quasi-twisted codes from a heuristic search algorithm2015In: Journal of Algebra Combinatorics Discrete Structures and Application, ISSN 2148-838X, Vol. 2, no 1, 1-18 p.Article in journal (Refereed)
    Abstract [en]

    Error control codes have been widely used in data communications and storage systems. One centralproblem in coding theory is to optimize the parameters of a linear code and construct codes withbest possible parameters. There are tables of best-known linear codes over finite fields of sizes up to9. Recently, there has been a growing interest in codes over F13 and other fields of size greater than9. The main purpose of this work is to present a database of best-known linear codes over the fieldF13 together with upper bounds on the minimum distances. To find good linear codes to establishlower bounds on minimum distances, an iterative heuristic computer search algorithm is employed toconstruct quasi-twisted (QT) codes over the field F13 with high minimum distances. A large numberof new linear codes have been found, improving previously best-known results. Tables of [pm;m] QTcodes over F13 with best-known minimum distances as well as a table of lower and upper bounds onthe minimum distances for linear codes of length up to 150 and dimension up to 6 are presented.

  • 20.
    Chen, Eric Zhi
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Nuh, Aydin
    USA.
    New quasi-twisted codes over F11— minimum distance bounds and a new database2015In: Journal of Information and Optimization Sciences, ISSN 0252-2667, E-ISSN 2169-0103, Vol. 36, no 1-2, 129-157 p.Article in journal (Refereed)
    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.

  • 21.
    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
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Klove, Torleiv
    Department of Informatics, University of Bergen.
    New constructions of disjoint distinct difference sets1998In: Designs, Codes and Cryptography, ISSN 0925-1022, E-ISSN 1573-7586, Vol. 15, no 2, 157-165 p.Article in journal (Refereed)
    Abstract [en]

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

  • 22.
    Du, Manxing
    et al.
    Acreo.
    Kihl, Maria
    Lund University.
    Arvidsson, Ake
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap. Lund University.
    Zhang, Huimin
    Uppsala University.
    Lagerstedt, Christina
    Acreo.
    Gawler, Anders
    Acreo.
    Prefetching schemes and performance analysis for TV on demand services2015In: International Journal On Advances in Telecommunications, ISSN 1942-2601, E-ISSN 1942-2601, Vol. 8, no 3&4, 162-172 p.Article in journal (Refereed)
    Abstract [en]

    TV-on-Demand services have become one of the most popular Internet applications that continuously attracts high user interest. With rapidly increasing user demands, the existing network conditions may not be able to ensure a low start-up delay of video playback. Prefetching has been broadly investigated to cope with the start-up latency problem, which is also known as user perceived latency. In this paper, two datasets from different IPTV providers are used to analyse the TV program request patterns. According to the results, we propose a prefetching scheme at the user end to preload videos before user requests. For both datasets, our prefetching scheme significantly improves the cache hit ratio compared to passive caching and we note that there is a potential to further improve prefetching performance by customizing prefetching schemes for different video categories. We further present a cost model to determine the optimal number of videos to prefetch. We also discuss if there is enough time for prefetching. Finally, more factors, which may have an impact onoptimizing prefetching performance, are further discussed, such as the jump patterns over different time in a day and the the distribution of each video’s viewing length.

  • 23.
    Du, Manxing
    et al.
    Acreo Swedish ICT.
    Kihl, Maria
    Lund University.
    Arvidsson, Åke
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap. Ericsson AB.
    Lagerstedt, Christina
    Acreo Swedish ICT.
    Gawler, Anders
    Acreo Swedish ICT.
    Analysis of prefetching schemes for TV-on-Demand service2015In: ICDT 2015 : the Tenth International Conference on Digital Telecommunications / [ed] Tapio Saarelainen, International Academy, Research and Industry Association (IARIA), 2015Conference paper (Refereed)
    Abstract [en]

    TV-on-Demand service has become one of the most popular Internet applications that continuously attracts higher user interests. With rapidly increasing user demand, the existing network conditions may not be able to ensure low start-up delay of video playback. Prefetching has been broadly investigated to cope with the start-up latency problem which is also known as user perceived latency. In this paper, we analyse request patterns for TV programs from a popular Swedish TV service provider over 11 weeks. According to the analysis, we propose a prefetching scheme at the user end to preload videos before user requests. Our prefetching scheme significantly improves the cache hit ratio compared to terminal caching and we note that there is a potential to further improve prefetching performance by customizing prefetching schemes for different video categories. We further present a cost model to determine the optimal number of videos to prefetch. Finally, we discuss available time for prefetching and suggest that when to make prefetching decisions depends on the user demand patterns of different video categories.

  • 24.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Approaching CMM to an educational CDIO based software engineering process2012In: Proceedings of the 8th International CDIO Conference, Queensland University of Technology, Brisbane, July 1 - 4, 2012, 2012Conference paper (Refereed)
    Abstract [en]

    Software Engineering is probably one of the most recent engineering disciplines. As such there have been major requirements put on that discipline to undergo appropriate transformations from immaturity to higher levels of maturity. This does not only relate to matters of evolution of techniques, and usability, but also the process of developing the software of concern.

    The ability to succeed in a large scaled Software Engineering project is probably highly dependent on the ways of working, that is, on the working process that fulfils the project. The Capability Maturity Model aims to assess the maturity of a software process, and serves as a guidance to improve such processes. Maturity here relates to degrees of formality and optimization, from ad hoc driven processes, via defined process structures, to active process optimization.

    Seen in a perspective of Software Engineering education we can see that it is of high importance that students get exhaustive practice in project based work. Several working process models of that are proposed in the context of Software Engineering research. Following such models may increase the probability of project success, both in industry and in educational projects. Still, a process with inherent self-reflecting mechanisms may increase such probability even further, with effect on quality of both work and product.

    This contribution will shed light on the working process of students, where self-reflection, self-motivation, and process improvement are put in focus. A model for this has been the Capability Maturity Model where reflecting over working processes aims to increase grades of process maturity and quality.

  • 25.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Demola: ett vinnande VFU-koncept i sammanhang av CDIO2014In: Lärarlärdom: högskolepedagogisk konferens 2014, Blekinge Tekniska Högskola / [ed] Christina Hansson, 2014Conference paper (Refereed)
    Abstract [sv]

    Bland de viktigaste grundläggande motiven bakom universitetsutbildning är att bidra med välutbildad arbetskraft till industrin, liksom samhället i stort. Båda parter, universitet och näringsliv, bör vinna på att ha väl utvecklade och gemensamma strategier för att samverka, via exempelvis industrinära projektbaserade kurser. Trots att vinster borde vara tydliga visar erfarenheter att sådana samarbeten, av olika anledningar, verkar vara tämligen lågprioriterade från båda parter. För att överbygga dessa inneboende motstånd finns ett behov av ett helt nytt tillvägagångssätt, där införandet av en nod mellan universitet och näringsliv, med väl förberedda begrepp och metoder för att arbeta med projekt, skulle tydliggöra rollerna för de involverade aktörerna. Här kan Demola ha positionen att vara en sådan nod. Demola har sitt ursprung i Tammerfors, Finland, och är en samarbetsplattform med fokus på industristödd innovativ produktutveckling. Här bidrar industripartners med låg risk med produktidéer, där multidisciplinära studentteam utvecklar dessa idéer i projekt, med sina egna innovativa förslag och prototyper. Demola har visat sig vara ett framgångsrikt begrepp och har inspirerat flera olika regioner i Europa att införa detta. Det innovativa pedagogiska ramverket CDIO bejakar utveckling av verklighetsnära system i utbildningen och Demolas bidrag till CDIO blir här tydligt där den nära relationen med industripartners och “verkliga system och produkter” särskilt betonas. Samtidigt är det väsentligt att se att universitet och högskolor har ansvar att ge kurser inom sina utbildningssystem, där studenterna exempelvis ska uppfylla vissa uppsatta lärandemål. För att undvika otydligheter eller motstridigheter är det därför viktigt att undersöka Demolas bidrag inom ramen för universitetsprogram och kursplaner. Erfarenheter kring Demola i utbildningen kommer här att presenteras, där diskussioner kring lärandemål sätts i sammanhang av CDIO. Hur Demola passar in i sammanhang av CDIO kommer också att belysas. Översiktliga introduktioner till både Demola och CDIO kommer att ges.

  • 26.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Ethics and responsibilities in a CDIO based software engineering process2013In: Proceedings of the 9th International CDIO Conference, Massachusetts Institute of Technology and Harvard University School of Engineering and Applied Sciences, Cambridge, Massachusetts, June 9 – 13, 2013, 2013Conference paper (Refereed)
    Abstract [en]

    The great impact that Software Engineering has had on society during the latest decades has put demands on that discipline to become a mature, as well as a trustworthy engineering discipline. Here, the so called, software engineering Code of Ethics has been introduced to encourage such development.

    The Code of Ethics has a prime focus on the Public, and a secondary focus on co-operation and development. While the Code of Ethics in first place concerns Software Engineers in professional work, it is interesting to see how this concept influences maturity and trustworthiness also to students in educational project based work.

    This contribution will cover on-going experiments in project based courses where students reflect on the Code of Ethics. Such reflections should have impact on team work, as well as on views on Software Engineering for the common public. The main question concerns how student’s project work may be improved through such reflections, to meet previously observed cases of low self-responsibility and effort. The contribution covers case studies of CDIO based projects, as well as the concept of the Code of Ethics of Software Engineering in itself.

    According CDIO, using the Code of Ethics in education should have relevance to several points of the CDIO syllabus, such as, 2.4 Attitudes, Thought and Learning, and 2.5 Ethics, Equity and Other responsibilities. The case studies as such, furthermore relate to aspects such as team work and communication, besides the core of the CDIO intension of driving student projects.

  • 27.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Internet of Things in education2010Conference paper (Refereed)
  • 28.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Kvalitetshöjande projekt2016In: Lärarlärdom 2016: Högskolan Kristianstad / [ed] Claes Dahlqvist & Stefan Larsson, Högskolan Kristianstad: Kristianstad University Press , 2016Conference paper (Other academic)
    Abstract [sv]

    Detta arbete är ett resultat av medel erhållna för kvalitetshöjande projekt. En del av projektet är presenterat vid konferensen CDIO2016, ytterligare delar presenteras här. Ett syfte med projektet är att föreslå lärandemål för kurser med inslag av VIL (Verksamhetsintegererat Lärande, mosvarande VFU). För att vara så generellt användbart som möjligt, även på en internationell nivå, så används CDIO Syllabus (www.cdio.org) och dess ramverk för lärandemål. CDIO Syllabus har visats svara väl även mot flera nationella ramverk (*), såsom Högskoleförordningen. Vi har ändå velat förtydliga motsvarigheten mellan uppsättningen valda lärandemål från CDIO Syllabus och Högskoleförordningen. Det gjorda urvalet baseras på nämnda motsvarighet, samt även på resultat av tidigare experiment, samt existerande lärandemål för en viss kurs.

    Liksom att högskolor och universitet har juridiska krav på sig att efterfölja Högskoleförordningens uppsatta lärandemål, så har man krav på sig att för studenterna handha kursutvärderingar. Här har vi valt ZEF-survey (http://zef.fi/zefsurvey/en/home/) som verktyg för att hantera kursutvärderingar, eftersom det ger möjlighet att svara på, och betrakta undersökande frågor på ett två-dimensionellt plan, vilket också ger flerdimensionella tolkningsmöjligheter. Ytterligare ett syfte är att matcha den valda uppsättningen lärandemål mot detta utvärderingsverktyg och experimentera med det vid ett kurstillfälle.

    Medan man traditionellt utför en kursutvärdering vid slutet av en kurs, för att låta resultatet ge möjlighet att påverka kommande kurstillfällen, så har vi här haft ett annat syfte och tillvägagångssätt. Ytterligare ett syfte med projektet har varit att betrakta kursutvärderingen som en iterativ process under kursens gång, där man dels får en kontinuerlig återkoppling under kursens gång, och dels ger möjlighet att låta studenter reflektera över lärandemål över en tid, istället för vid en punkt. Det senare blir särskilt intressant då man på detta sätt kan gynna en process mot en högre medvetenhet hos studenterna beträffande det som kursen är tänkt att bidra med.

  • 29.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Progressioner inom en projekt-baserad kurs baserad på principer från Software Engineering och CDIO2013In: Lärarlärdom: högskolepedagogisk konferens 2013 i Kristianstad / [ed] Stefan Larsson, Kristianstad: Kristianstad University Press , 2013, 6-25 p.Conference paper (Other academic)
    Abstract [sv]

    För att möta kraven hos anställda inom industrin för moderna datorbaserade produkter behöver utbildningsanstalterna ge studenter möjlighet att ta till sig av såväl fundamentala och långlivade teorier som de  senaste teknikerna. Detta är dock inte tillräckligt. Storskaliga produkter kräver samverkan mellan grupper av  utvecklare och detta faktum i sig självt sätter fokus på ytterligare utmaningar.  Själva arbetsprocessen måste  synkroniseras, kommunikationen mellan utvecklare måste vara effektiv, osv. För att förbereda studenter på även  sådana utmaningar måste således utbildningsanstalterna dessutom anpassa undervisningen så att även arbeten i  projektgrupper, kommunikation inom dessa, styrning av arbetsprocesser, förhållningssätt, mm,  ges lämpliga utrymmen.

    CDIO är ett världsomspännande innovativt utbildningsramverk för att producera nästa generation av ingenjörer. I fokus för detta står projektbaserade undervisningsformer. Speciellt bejakar man arbetsfaserna Concieve (C), Design (D), Implement (I) och Operate (O), där man via dessa utvecklar en produkt som ska ha tillräckliga inslag av svårighet och komplexitet för att efterlikna de utmaningar man har i utveckling av verkliga produkter. Bakgrunden till detta initiativ ligger en identifiering av ett signifikant problem i teknikindustrin där man sett att utbildning av ingenjörer mestadels utgår från teoretiserade problem. Man har alltså ett gap mellan utbildningen och  teknikindustrins krav. Vidare kräver reell produktutveckling samarbeten i arbetsteam, där även detta poängteras som CDIO-synvinkel.

    Detta bidrag har tre huvudsyften. Dels kommer det att presentera CDIO och begrepp som förekommer inom detta. Dels kommer exempel ges på en kurs i Software Engineering, som kan ses som särskilt CDIO- inspirerad. Kursen har i sin form tre år bakom sig, där stegvis utveckling gjorts speciellt med fokus på att förbättra arbetsprocessen.  Inspiration för progression av kursen har tagits såväl från CDIO som från området för Software Engineering. Inspiration från Software Engineering bör ses utifrån de barnsjukdomar och mognadsprocesser denna fortfarande tämligen nya disciplin har bakom sig. Därför kommer även detta att belysas. Vidare kan materialet bakom detta bidrag även delvis ses som en sammanställning  av tre på varandra följande konferensbidrag till internationellt hållna CDIO-konferenser.

  • 30.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Värderingsförmåga och förhållningssätt i Software Engineering2017In: Högskolepedagogisk debatt, ISSN 2000-9216, no 1, 72-80 p.Article in journal (Other academic)
  • 31.
    Einarson, Daniel
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Working- vs. educational processes in software engineering vs. CDIO2011In: 7th International CDIO Conference 2011, Danmarks Tekniske Universitet, DTU, 2011, 438-452 p.Conference paper (Refereed)
    Abstract [en]

    The relatively short history of IT can unfortunately point out a number of failing projects concerning missing deadlines, functionalities, low quality, etc. Theories and techniques have been developed, to meet inherent problems and challenges. But also software process models, that is ways of working, where several typical activities within software processes have been emphasized. Still, the use of software also seems to bring even further requirements on new techniques. A conclusion is therefore that, besides from some core fundaments, inherent parts of IT are, by necessity, evolving in themselves.

    When it comes to educational systems, an appropriate set of theories, techniques, and principles should be taught to prepare for working in software industry. Still, this is not enough. A software engineer actually needs to be able to handle all the steps of a software process. That is, educational systems have to find ways to support teachings, not only in theories, techniques, and principles, but also in ways of working that hopefully should correspond well to the practices of software industry. Furthermore, students should be gained by getting educational support to meet and handle the ever changing future.

    This contribution presents project based approaches where the process of developing the project result should have several benefits. First, it should provide a basis for training core practices of Computer Science, second it should prepare for software processes, i.e., ways of working in software industry, and third, it should aim for students being responsible for self learning. Especially, the third point is significantly important in a discipline of ever changing techniques. Inspiration is taken from well known Software Process Models. Such are models are shown to lie close to the CDIO initiative. Software Process Models are discussed, comparisons with CDIO are provided, as well as a case study on a project based course.

  • 32.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Lundblad, Henrik
    Lund University.
    Demola, the upcoming win-win relationship between university and industry2014In: Proceedings of the 10th International CDIO Conference, Barcelona, Spain, June 15-19 2014, 2014Conference paper (Refereed)
    Abstract [en]

    One of the main fundamental reasons behind university education, is to provide well-educated work power for industry, as well as society in large. Both parts, here university and industry, should gain by having well developed and common strategies to bridge the inherent gap between those two, though, for instance, industry close project based courses. Still, experiences show that even though benefits from this should be clear, priorities on support for this seem to be quite low, by different reasons, from both parts. To overcome that there is a need for a completely new approach, where introducing a node between universities and industry, with well-prepared full sets of concepts and ways or working with projects, would illuminate on possibilities and roles of collaborating participants. Here Demola may have the position of such a node. Demola, originating from Tampere, Finland, is a collaboration platform with focus on industry supported innovative product developments. Here industry partners contribute with low risk with product ideas, where multidisciplinary student teams meet those ideas in projects, with their own innovative proposals and prototyping. Demola has proved itself to be a success, influencing several regions in different countries in Europe to adopt this concepts. The innovative educational framework CDIO, acknowledges student practice in developing real-world systems and products. Demola’s contribution to this is the close relationship with industrial partners, where ‘real-world systems and products’ is especially emphasized. Still, responsibilities of university partners are to provide courses within their educational systems, and where students should meet certain sets of learning outcomes. Therefore, to avoid conflicting situations, it is essential to investigate the contribution of Demola in the context of university programs and syllabuses. We will here provide experiences on that. Demola, as such, will be presented, experiences from involved stakeholders will be shown, and correspondences with CDIO syllabus and standards, will be emphasized.

  • 33.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Melén Fäldt, Maria
    Kristianstad University, Learning Resource Centre.
    Introduktion till Temanumret: läraktiviteter för att uppnå värderingsförmåga och förhållningssätt2017In: Högskolepedagogisk debatt, E-ISSN 2000-9216, no 1, 2-15 p.Article in journal (Other academic)
  • 34.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Saplacan, Diana
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    A participatory action research approach to developing assistive technologies for people suffering from cognitive disorders2014In: Abstract book: 6th Living Knowledge Conference April 9-11, 2014 / [ed] Søsser Brodersen, Jens Dorland and Michael Søgaard Jørgensen, 2014Conference paper (Refereed)
    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.

  • 35.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Saplacan, Diana
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    A proposal of learning outcomes for work integrated learning based on 2d-evaluation methods2016In: Lärarlärdom 2016: Högskolan Kristianstad / [ed] Claes Dahlqvist & Stefan Larsson, 2016Conference paper (Other academic)
    Abstract [en]

    The core of CDIO addresses criticism from engineering industry according engineering education having too much focus on theoretical training. Here, practice, and especially integrating theory and practice, has had a peripheral role implying students not being well enough prepared for the complexity of industry’s real world problems and solutions. CDIO aims to meet that criticism through especially illuminating on project based educational forms, where sections of the, so called, CDIO Syllabus point out desired knowledge and skills that are needed to fulfil complex enough projects in engineering education. That approach not only prepares students in appropriate ways for the benefits of industry, but also increases their value of being employable. CDIO does not explicitly point out industry close work placement in education, neither in the CDIO syllabus, nor in the CDIO Standards. Still, many universities strive after work integrated learning, in purposes of, e.g., employability, and real world preparation. Experiences show problems in work integrated learning due to several reasons, such as, establishing sustainable academy–industry contacts, strategies for project ownership and IPR (Intellectual Property Rights), and guarantees according fulfillment of academic requirements on learning outcomes.

    The concept of Demola relates to a platform for collaborations between academy and industry with focus on multi-disciplinary student projects. Especially focus is on innovation, where industry may experiment with new ideas at low cost. Demola has proved itself to be a successful approach, with developed templates for student-industry contracts, and process models. Still, to be an attractive choice for work integrated learning, the Demola approach also has to be clear with respect to academic contexts of courses’ learning outcomes, and course evaluations.

    The aim of this contribution is to point out a set of learning outcomes in a purpose of clarifying on such set being an inherent part of Demola. That set, which is based on CDIO Syllabus, shall map towards a tool for evaluations, where the two-dimensional multi-valued tool ZEFsurvey, is chosen. Overviews and discussions will be provided, as well as test cases, and comparisons between the chosen set with the Swedish national framework for education, will be outlined in the purpose of pointing out adaptability in an international context.

  • 36.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Saplacan, Diana
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    The Active Ageing approach to quality of life for elderly people through order and distribution chains2016In: 2016 INTERNATIONAL CONFERENCE ON COMPUTATION SYSTEM AND INFORMATION TECHNOLOGY FOR SUSTAINABLE SOLUTIONS (CSITSS), 2016, 220-225 p.Conference paper (Refereed)
    Abstract [en]

    An important aspect of elderly people's habits can be connected to food and meal. To be able to make your own choices according good, and healthy food, even in situations of high age, and functional disabilities adds to quality of life. This contribution covers outcomes of the Active Ageing project, dealing with studies of elderly people's food situation, to be able to find suitable computer based support systems in order to provide appropriate food. Especially, background investigations will be covered, and prototype support systems will be outlined.

  • 37.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Saplacan, Diana
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Silvén, Pekka
    Finland.
    Approaching work integrated learning through learning outcomes and evaluations2016In: The 12th international CDIO conference proceedings: full papers / [ed] Jerker Björkqvist, Kristina Edström, Ronald J. Hugo, Juha Kontio, Janne Roslöf, Rick Sellens & Seppo Virtanen, Turku: Turku University of Applied Sciences , 2016, 722-732 p., 144Conference paper (Refereed)
    Abstract [en]

    The  core  of  CDIO  addresses  criticism  from  engineering  industry  according engineering education having too much focus on theoretical training. Here, practice, and especially integrating theory and practice, has had a peripheral role implying students not being well enough prepared for the complexity of industry’s real world problems and solutions. CDIO aims to meet that criticism through especially illuminating on project based educational forms, where sections of the, so called, CDIO Syllabus point out desired knowledge and skills that are needed to fulfil complex enough projects in engineering education. That approach not only prepares students in appropriate ways for the benefits of industry, but also increases their value of being employable. CDIO does not explicitly point out industry close work placement in education, neither in the CDIO syllabus, nor in the CDIO Standards. Still, many universities strive after work integrated learning, in purposes of, e.g., employability, and real world preparation. Experiences show problems in work integrated learning due to several reasons, such as, establishing sustainable academy–industry contacts, strategies for project ownership and IPR (Intellectual Property Rights), and guarantees according fulfillment of academic requirements on learning outcomes.

    The concept of Demola relates to a platform for collaborations between academy and industry with focus on multi-disciplinary student projects. Especially, focus is on innovation, where industry may experiment with new ideas at low cost. Demola has proved itself to be a successful approach, with developed templates for student-industry contracts, and process models. Still, to be an attractive choice for work integrated learning, the Demola approach also has to be clear with respect to academic contexts of courses’ learning outcomes, and course evaluations.

    The aim of this contribution is to point out a set of learning outcomes in a purpose of clarifying on such set being an inherent part of Demola. That set, which is based on CDIO Syllabus, shall map towards a tool for evaluations, where the two-dimensional multi-valued tool ZEFsurvey, is chosen. Overviews, case studies, and discussions will be provided, where one purpose is to point out the adaptability of Demola in an international context.

  • 38.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Sommarlund, Petra
    SP Technical Research Institute of Sweden.
    Segelstrom, Fabian
    Usify Sweden.
    IoT-support systems for parents with ADHD and autism2016In: 2016 INTERNATIONAL CONFERENCE ON COMPUTATION SYSTEM AND INFORMATION TECHNOLOGY FOR SUSTAINABLE SOLUTIONS (CSITSS), 2016, 198-202 p.Conference paper (Refereed)
    Abstract [en]

    This paper describes the outcomes of a one year long research project aimed at identifying and prototyping ideas for Internet of Things-based products which can help parents with ADHD or autism in their everyday life. The project was conducted according to user-centered design principles to identify ideas, which were later prototyped and made technical proof-of-concepts of. This paper focuses on the process of making the technical proof-of-concept, after initially describing the process of arriving at the ideas which were prototyped.

  • 39.
    Einarson, Daniel
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Wendin, Karin
    Kristianstad University, School of Education and Environment, Avdelningen för Praktisk-estetiska ämnen. Sveriges Tekniska Forskningsinstitut SP.
    Saplacan, Diana
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Learning structures of CDIO based projects in contexts of Demola2015Conference paper (Refereed)
    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.

  • 40.
    Faraon, Montathar
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Webbutveckling med PHP och MySQL2016 (ed. 2)Book (Other academic)
    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.

  • 41.
    Faraon, Montathar
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap. Kristianstad University, Forskningsmiljön ForFame.
    Webbutveckling med PHP och MySQL2012Book (Other (popular science, discussion, etc.))
    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 lättillgänglig och komplett introduktion till PHP. Läsaren får den kunskap som behövs för att snabbt komma igång och skapa egna webbapplikationer.

    Boken erbjuder stöd i det egna arbetet, möjligheter till fördjupning och ger en beskrivning av allt från installation av PHP till felsökning av programmeringskod. Bokens pedagogiska framställning kräver ingen teknisk kunskap, läsaren leds framåt genom ett rikt utbud av övningar som ger möjlighet att tillämpa innehållet.

    Webbutveckling med PHP och MySQL är i första hand en lärobok för universitetsstudier i webbprogrammering men även en handbok för webbdesigners och programmerare i näringslivet.

  • 42.
    Huang, Xin
    et al.
    Department of Computer Science, Institute for the Future of Computing/Oxford Martin School, University of Oxford.
    Chen, Bangdao
    Department of Computer Science, University of Oxford.
    Markham, Andrew
    Department of Computer Science, Institute for the Future of Computing/Oxford Martin School, University of Oxford.
    Wang, Qinghua
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap. Department of Communications and Networking, Aalto University, Espoo.
    Zheng, Yan
    Department of Communications and Networking, Aalto University, Espoo.
    Roscoe, Andrew William
    Department of Computer Science, Institute for the Future of Computing/Oxford Martin School, University of Oxford.
    Human interactive secure key and ID exchange protocols in body sensor networks2013In: IET Information Security, ISSN 1751-8709, E-ISSN 1751-8717, Vol. 7, no 1, 30-38 p.Article in journal (Refereed)
    Abstract [en]

    A body sensor network (BSN) is typically a wearable wireless sensor network. Security protection is critical to BSNs, since they collect sensitive personal information. Generally speaking, security protection of BSN relies on identity (ID) and key distribution protocols. Most existing protocols are designed to run in general wireless sensor networks, and are not suitable for BSNs. After carefully examining the characteristics of BSNs, the authors propose human interactive empirical channel-based security protocols, which include an elliptic curve Diffie–Hellman version of symmetric hash commitment before knowledge protocol and an elliptic curve Diffie–Hellman version of hash commitment before knowledge protocol. Using these protocols, dynamically distributing keys and IDs become possible. As opposite to present solutions, these protocols do not need any pre-deployment of keys or secrets. Therefore compromised and expired keys or IDs can be easily changed. These protocols exploit human users as temporary trusted third parties. The authors, thus, show that the human interactive channels can help them to design secure BSNs.

  • 43.
    Huang, Xin
    et al.
    Kina.
    Craig, Paul
    Kina.
    Wang, Qinghua
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Identity-based association protocols for wireless personal area networks2015In: Proceedings of The 13th IEEE International Conference on Dependable, Autonomic, and Secure Computing, IEEE conference proceedings, 2015Conference paper (Refereed)
    Abstract [en]

    Identity based infrastructure allows the public keyof a user to be derived easily from a predefined aspect of theirknown identity such as a phone number, passport number orother universally unique identifier. Recently, H¨olbl and Welzerhave proposed an identity-based key establishment protocol.However, this protocol is found to be vulnerable to man-inthe-middle attacks and impersonation attacks. In this paper,we propose multi-channel identity based protocols for wirelesspersonal area networks which can eliminate these attacks.These protocols alleviate the certificate overhead by using apublic key infrastructure which is suitable for wireless personalarea networks.

  • 44.
    Johansson, Lars-Olof
    et al.
    Halmstad University.
    Cronquist, Björn
    Kristianstad University, School of Education and Environment, Avdelningen för Naturvetenskap.
    Kjellin, Harald
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Visualization as a tool in action case research2007In: ECRM 6th European conference on eesearch methodology for business and management / [ed] Dan Remenyi, 2007Conference paper (Refereed)
    Abstract [en]

    There are numerous examples of the use of visualization of events and processes within the field of Information Systems. Rich pictures are used in soft systems methodology (SSM), images of event-driven chain models are used in process modeling, etc. This paper focuses on the use of generic visualization methods in action case research. In action case research, the researcher balances between interpretation of qualitative data and intervention to solve the problem of the research partner. Two kinds of results are expected: conceptual results, as in describing expected events or expected functionality, and concrete results, as in taking action in some problem-solving context. The questions raised in this paper are: 1. What are the benefits of using visualization as a tool for building shared interpretations and mutual understandings between researchers and practice in action case research settings? 2. How can visualization activities in small and medium-sized enterprises (SMEs) contribute to bridging the gap between conceptual and concrete levels of results? In this paper we present empirical findings from an action case research project. Flower Systems Ltd. is a software company that has developed a document handling system (ISOX) especially designed to meet the needs of social services in local governments. The concrete result of the collaboration is a more user-friendly, redesigned version of ISOX based on the use of different visualization techniques. The conceptual result is a proposed model for using visualization when balancing between interpretation and intervention.

  • 45.
    Johansson, Michael
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Abadyl of tunes: bring the noise2012In: 2012 International Conference on Cyberworlds (CW) / [ed] Arjan Kuijper, Alexei Sourin, 2012, 278-282 p.Conference paper (Refereed)
    Abstract [en]

    In this paper, in a project still in the making, I will present how we developed a process for collectively producing the explorative soundscapes, using specific constraints of the Abadyl framework influenced by theories from art and architecture. I will show how we worked with a design methodology that brought together an editor and the final expression of the artwork into one surface of interaction and execution using a virtual cityscape as an iterative ground for sound and music explorations. I will also discuss how we tweaked/iterated with the parameters of the framework, the sounds and the final visual expression to match our artistic intention, and finally to bring some noise into Abadyl.

  • 46.
    Johansson, Michael
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Bring the noise2013In: International Journal of Art, Culture and Design Technologies, ISSN 2155-4196, Vol. 3, no 1, 26-35 p.Article in journal (Refereed)
    Abstract [en]

    In this article the author will present how they developed different processes for collectively producing a seriesexplorative soundscapes and mechanical artefacts using specific constraints influenced by theories from artand architecture. The author will show how they worked with a design methodology that brought togetheran editor and the final expression of the artwork into one surface of interaction and execution using a virtualcityscape as an iterative ground for sound and music explorations, and give some examples of the differentprototypes and iterations. The author will also discuss how they tweaked/iterated with the parameters of the framework, the sounds and the final visual expression to match their artistic intention, and finally to bringsome noise into Abadyl. Also influencing the overall framework.

  • 47.
    Johansson, Michael
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Ideal spaces exhibition2017In: ArtsIt2017, 2017Conference paper (Other academic)
    Abstract [en]

    Through the years we have worked with  the idea of gestalt through artefact creation (including virtual objects and 3D-worlds) as one surface to explore, exploit, test and communicate our ideas and concepts, that are generative rather than produced, where we try  to grasp systematic insights through complex generated realities, in which an audience later is invited to interact.  In our Ideal spaces exhibition for the 2016 Biennale in Venice, we tried to explore this via a combination of presenting ideal city spaces, active participation of the visitors molding their own spaces, and symbolic representation. Ideal Spaces is also a high-tech project that uses diverse technologies in new ways, also new techniques and programming developed by us. In this paper, we show the theoretical and cultural background, and some lessons learned, regarding on what level of abstraction a visitor could interact with our exhibition to better understand how visitors created their own ideal spaces.

  • 48.
    Johansson, Michael
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    Soundscaping2017In: Enhancing art, culture, and design with technological integration / [ed] Mehdi Khosrow-Pour, Hershey, Pennsylvania 17033-1240, USA: IGI Global , 2017Chapter in book (Other academic)
  • 49.
    Johansson, Michael
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    The eight continent: design for an intentional surprise2013In: Proceedings: 2013 International Conference on Cyberworlds / [ed] Xiaoyang Mao, Lichan Hong, Los Alamitos: IEEE Computer Society, 2013, 232-239 p.Conference paper (Refereed)
    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?

  • 50.
    Johansson, Michael
    Kristianstad University, School of Health and Society, Avdelningen för Design och datavetenskap.
    The people´s smart sculpture PS22016In: ISEA 2016: Journey to Abadyl / [ed] Martin Koplin, 2016Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    The People’s Smart Sculpture (PS2) panel discusses future oriented approaches in smart media-art, developed, designed and exploited for artistic and public participation in the change and re-design of our living environment. The actual debate about a smart future is not taking into account any idea of media art as an instrument for to realize the social sculpture, mentioned by Beuys[1] or as social sculpture itself.

    The People’s Smart Sculpture is the only large scale Creative Europe media-art project (2014-2018) in this context. It fosters participative-art and collaborative media-art-processes. The artistic results and the open approaches of the project will be discussed by 5 panelists from 5 countries. The project itself is constituted by 12 project-partners in 8 European countries with more than 350 artists and creatives from 29 countries worlwide. The approach works on two levels: the implementation of cultural participation-projects by media-artists and the ongoing optimization of the art and participation aspects. PS2 integrates diverse groups of people to participate in the non-institutional set up of structures for the people´s re-design of their urban, societal and living environment. Artists, citizens, creatives with a new user's perception and new skills are able to „medialize“ the Cultural R>evolution of art, culture, society and science: into spaces of a new public.

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