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  • 1.
    Aghi, Nawar
    et al.
    Kristianstad University, Faculty of Natural Science.
    Abdulal, Ahmad
    Kristianstad University, Faculty of Natural Science.
    House Price Prediction2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study proposes a performance comparison between machine learning regression algorithms and Artificial Neural Network (ANN). The regression algorithms used in this study are Multiple linear, Least Absolute Selection Operator (Lasso), Ridge, Random Forest. Moreover, this study attempts to analyse the correlation between variables to determine the most important factors that affect house prices in Malmö, Sweden. There are two datasets used in this study which called public and local. They contain house prices from Ames, Iowa, United States and Malmö, Sweden, respectively.The accuracy of the prediction is evaluated by checking the root square and root mean square error scores of the training model. The test is performed after applying the required pre-processing methods and splitting the data into two parts. However, one part will be used in the training and the other in the test phase. We have also presented a binning strategy that improved the accuracy of the models.This thesis attempts to show that Lasso gives the best score among other algorithms when using the public dataset in training. The correlation graphs show the variables' level of dependency. In addition, the empirical results show that crime, deposit, lending, and repo rates influence the house prices negatively. Where inflation, year, and unemployment rate impact the house prices positively.

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  • 2.
    Alagic, Amir
    Kristianstad University College, School of Engineering.
    BookZone web shop2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [en]

    My task was to create an e-commerce solution or web shop that is integrated with PayPal system. The intent of this paper is to show how this e-commerce web application was built and integrated with the PayPal system.

    The underlying technology used in the implementation of the application includes .Net 2.0 framework (ASP.Net 2.0 and C# 2005 and Express edition of SQL Server 2005)

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  • 3.
    Alassadi, Abdulrahman
    et al.
    Kristianstad University, Faculty of Natural Science.
    Ivanauskas, Tadas
    Kristianstad University, Faculty of Natural Science.
    Classification Performance Between Machine Learning and Traditional Programming in Java2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This study proposes a performance comparison between two Java applications with two different programming approaches, machine learning, and traditional programming. A case where both machine learning and traditional programming can be applied is a classification problem with numeric values. The data is heart disease dataset since heart disease is the leading cause of death in the USA. Performance analysis of both applications is carried to state the differences in four main points; the development time for each application, code complexity, and time complexity of the implemented algorithms, the classification accuracy results, and the resource consumption of each application. The machine learning Java application is built with the help of WEKA library and using its NaiveBayes class to build the model and evaluate its accuracy. While the traditional programming Java application is built with the help of a cardiologist as an expert in the field of the problem to identify the injury indications values. The findings of this study are that the traditional programming application scored better performance results in development time, code complexity, and resource consumption. It scored a classification accuracy of 80.2% while the Naive Bayes algorithms in the machine learning application scored an accuracy of 85.51% but on the expense of high resource consumption and execution time.

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  • 4.
    Ali, Hayder
    et al.
    Kristianstad University, School of Health and Society.
    Spets, Rasmus
    Kristianstad University, School of Health and Society.
    Virtualisering av skrivbordsmiljöer: en teknisk jämförelse2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Detta arbete syftar till en jämförelse av olika skrivbordsvirtualiserings produkter och hur respektive miljö ser ut. I utredandeavsnittet presenteras information om skrivbordsvirtualiserings olika lösningar och hur de fungerar. Arbetet redogör för de två stora aktörerna inom detta område, Citrix och VMware. Utredandeavsnittet presenterar även lite information om Nvidias grafiklösningar i de olika miljöerna. Genomförandeavsnittet presenterar information från intervjuer med representanter från de två stora aktörerna. Arbetet presenterar även information från en representant från Nvidia, USA. Intervjuerna har skett via e-mail eftersom personligt möte varit väldigt svårt att lösa. Intervjuerna behandlar frågor om respektive lösning om hur de fungerar och även om användarvänlighet och åtkomst för användare. Fokus ligger på användarvänlighet och åtkomst för användare i respektive lösning. Efter arbetet kan det dras några slutsatser. Främst att de två miljöerna som undersökts är ganska lika när det gäller virtualisering av skrivbord. De är uppbyggda på liknande sätt och fungerar på nästan samma sätt när det gäller åtkomst för användare.

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  • 5.
    Ali, Viann
    Kristianstad University, Faculty of Business.
    Ett designförslag: en mobilapplikation som kan realtidsdiagnostisera patienter utanför sjukhuset och påskynda utryckning vid hjärtstillestånd2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Research shows that cardiac arrest is common outside hospitals and that they usually have a fatal outcome if they do not receive care as soon as possible. Many cardiac arrests occur in private settings where there is no pacemaker, family member or outsider who can help. The purpose of this study is to find out how a remote monitoring system with a user interface through an app can be designed to real-time diagnose patients with cardiovascular disease outside the hospital and accelerate emergency response. The study has been based on concept-driven design research with a qualitative approach and interviews with both open and closed questions. The individuals who have been interviewed are cardiologists who work in the cardiology department at Ryhov County Hospital in Jönköping. The chosen method has been combined with a literature search in healthcare technology and UX / UI design. The study results in a proposal for a user interface, through an app, which offers health overview and real-time diagnosis. Using these statistics, algorithms can notify the user in the app if their values are normal or abnormal. The algorithms can also warn the user through notifications in the event of serious health changes when the user needs urgent care. The app also offers site location and that SOS-alarm can be alerted directly in the event of serious health changes. Emergency response can then be accelerated by SOS-alarm sending an ambulance to the place where the patient is located immediately.

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    Kandidatuppsats_Informatik
  • 6.
    Alm, Ia
    et al.
    Kristianstad University, Faculty of Business.
    Lundström, Nicole
    Kristianstad University, Faculty of Business.
    Hur platt kan det vara?: En studie om seniorers förståelse av skeumorfism och platt design inom e-hälsa2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The vast progress of digitization creates problems for the seniors who find it hard to keep up with modern technology development. At the same time, the Swedish government has set itself the goal of digitizing health care by 2025. In connection with the trend of using flat design in digital platforms, the situation of seniors is further complicated and may have a negative effect in expanding the digital divide.

    Previous research shows that the style of the flat design is more difficult to understand than the traditional, skeuomorphic design previously used, as flat design lacks affordances. The aim of this thesis has been to investigate whether flat design is more difficult for seniors to understand than traditional skeuomorphic design, as well as how the design principle affordance could solve the problem of understanding flat design.

    The thesis has been guided by the question: How are seniors' understanding of flat design compared to traditional design in the context of websites and what significance does affordance have to support their understanding? To answer the question, a quantitative questionnaire survey and a qualitative observation study have been conducted to investigate the variables of the question based on previous theories. The result shows that affordance does not seem to affect how seniors understand a design interface. On the other hand, indications suggest that design principles such as visual clues, or signifiers, are important to consider when designing for a senior audience design. 

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  • 7.
    Alm, Robert
    et al.
    Kristianstad University, Faculty of Natural Sciences.
    Imeri, Lavdim
    Kristianstad University, Faculty of Natural Sciences.
    A performance comparison between graph databases: Degree project about the comparisonbetween Neo4j, GraphDB and OrientDB on different operations2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this research we study what is the theoretical complexity of Neo4J, OrientDB and GraphDB, (three known Graph Databases that can be accessed by a Java instance), and how this complexity is manifested in a real life performance, To study their practical performance, a software was implemented and named as a profiler, which is capable to profile, (to record the time that is needed), each operation, and display the results in an accurate and organized manner. The technical documentation of those 3 databases was reviewed as well, to identify how the databases work, and what are their strong and weak points. By the profiling process, the best performance was displayed by Neo4J, and while OrientDB failed to deliver, GraphDB takes the second place in terms of performance. We can identify a potential in OrientDB’s approach, but its structure is too complex and rigid. Neo4J has a robust structure and an architecture that gives to it a great performance, while the Cypher syntax, which Neo4J uses, minimizes the possibility of human error. GraphDB is optimized for large scale public-data operations but performs well as a stand-alone solution as well.

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    FinalThesis-Alm-Imeri
  • 8. al-Rifaie, Fatimah Majid
    et al.
    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, p. 301-321Conference 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.

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  • 9.
    Andersson, Anders-Petter
    et al.
    Kristianstad University, School of Health and Society, Avdelningen för Hälsovetenskap II. Kristianstad University, Research Platform for Collaboration for Health.
    Cappelen, Birgitta
    The Oslo School of Architecture and Design.
    Musical interaction for health improvement2014In: Oxford handbook of interactive audio / [ed] Karen Collins, Bill Kapralos, Holly Tessler, Oxford: Oxford University Press , 2014, p. 247-262Chapter in book (Refereed)
    Abstract [en]

    During the past decade, tangible sensor technologies have matured and become less expensive and easier to use, leading to an explosion of innovative musical designs within video games, smartphone applications, and interactive art installations. Interactive audio has become an important design quality in commercially successful games like Guitar Hero , and a range of mobile phone applications motivating people to interact, play, dance, and collaborate with music. Parallel to the game, phone, and art scenes, an area of music and health research has grown, showing the positive results of using music to promote health and wellbeing in everyday situations and for a broad range of people, from children and elderly to people with psychological and physiological disabilities. Both quantitative medical and ecological humanistic research show that interaction with music can improve health, through music’s ability to evoke feelings, motivate people to interact, master, and cope with difficult situations, create social relations and experience shared meaning. Only recently, however, the music and health field has started to take interest in interactive audio, based on computer-mediated technologies’ potential for health improvement. Here, we show the potential of using interactive audio in what we call interactive musicking in the computer-based interactive environment Wave. Interactive musicking is based on musicologist Christopher Small’s concept “musicking”, meaning any form of relation-building that occurs between people, and people and things, related to activities that include music. For instance, musicking includes dancing, listening, and playing with music (in professional contexts and in amateur, everyday contexts). We have adapted the concept of "musicking" on the design of computer-based musical devices. The context for this chapter is the research project RHYME. RHYME is a multidisciplinary collaboration between the Centre for Music and Health at the Norwegian Academy of Music, the Oslo School of Architecture and Design (AHO), and Informatics at the University of Oslo. Our target group is families with children with severe disabilities. Our goal is to improve health and wellbeing in the families through everyday musicking activities in interactive environments. Our research approach is to use knowledge from music and health research, musical composition and improvisation, musical action research, musicology, music sociology, and soundscape studies, when designing the tangible interactive environments. Our focus here is interaction design and composition strategies, following research-by-design methodology, creating interactive musicking environments. We describe the research and design of the interactive musicking environment Wave, based on video documentation, during a sequence of actions. Our findings suggest some interactive audio design strategies to improve health. We base the design strategies on musical actions performed while playing an instrument, such as impulsive or iterative hitting, or sustainable stroking of an instrument. Musical actions like these can also be used for musicking in everyday contexts, creating direct sound responses to evoke feelings that create expectations and confirm interactions. In opposition to a more control-oriented, instrument and interface perspective, we argue that musical variation and narrative models can be used to design interactive audio, where the audio is seen as an actor taking many different roles, as instrument, co-musician, toy, etc. In this way, the audio and the interactive musicking environments will change over time, answering with direct response, as well as nose-thumbing and changing response, motivating creation, play, and social interaction. Musical variation can also be used to design musical backgrounds and soundscapes that can be used for creating layers of ambience. These models create a safe environment and contribute to shared meaning.

  • 10.
    Andersson, Anders-Petter
    et al.
    Kristianstad University, School of Health and Society.
    Cappellen, Birgitta
    The Oslo School of Architecture and Design.
    Same but different: composing for interactivity2008In: Audio Mostly Conference: A Conference on Interaction with Sound, October 22-23 2011, Luleå University, Interactive Institute, Sonic, 2008, p. 80-85Conference paper (Refereed)
    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.

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  • 11.
    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.

  • 12.
    Andersson, Tobias
    et al.
    Kristianstad University, Faculty of Natural Sciences.
    Reinholdsson, Håkan
    Kristianstad University, Faculty of Natural Sciences.
    REST API vs GraphQL: A literature and experimental study2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to compare the two architectural techniques REST and GraphQL. This thesis will compare the two techniques and what defines them. A literature study and experimental study are carried out by the researchers. Four applications have been developed that include the ability to disable and to enable caching for both technologies to test the performance effect of caching. Earlier work has not covered the effects on caching related to these two frameworks. The literature study results point to that REST services are up to date and GraphQL is a technique with a shorter history, but that has declared growth in the industry and is a well suited choice for example when bandwidth matters in mobile phone applications. In the experimental study the tests showed slightly better results on average for REST API in terms of total response time (ms). Depending on the intended project there are many factors that need to be evaluated before making a decision on which framework to use. 

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  • 13.
    Arvidsson, Daniel
    et al.
    Kristianstad University, School of Health and Society.
    Bergqvist, Joakim
    Kristianstad University, School of Health and Society.
    Bünger, Robin
    Kristianstad University, School of Health and Society.
    IP-telefoni: en teknisk undersökning2011Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Projektet har till syfte att undersöka den revolutionerande tekniken bakom IP-telefoni. Eftersom tekniken är relativt ung så finns det fortfarande mycket att lära om hur det fungerar och hur den används. Projektet behandlar fördelar och nackdelar samt vilka hot som finns och hur man kan känna sig säker när man använder IP-telefoni till vardags. Det primära objektivet med projektet är att få en helhetsbild och förstå hur tekniken verkligen fungerar.

    Vidare behandlas telefonens historia då det är viktigt att se var tekniken har sina rötter och hur den utvecklats sedan dess. Som en röd tråd från telefonens teknologi och det publika telefonnätets rötter görs en jämförelse mellan de två teknologierna för att se skillanderna och förmodade fördelar och nackdelar med de båda systemen. Olika sorters protokoll som har ett nära förhållande till IP-telefoni så som SIP, RTP, UDP och IP behandlas. För att få en sanningsenlig bild över hur vardagliga användare upplever IP-telefoni så har en enkätundersökning angående vanor och möjliga problem gjorts hos de anställda på Region Skåne.

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  • 14.
    Arvidsson, Åke
    et al.
    Kristianstad University, Faculty of Natural Science, Research environment of Computer science (RECS). Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Grinnemo, Karl-Johan
    Karlstads universitet.
    Chen, Eric Zhi
    Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap. Kristianstad University, Faculty of Natural Science, Research environment of Computer science (RECS).
    Wang, Qinghua
    Kristianstad University, Faculty of Natural Science, Research environment of Computer science (RECS). Kristianstad University, Faculty of Natural Science, Avdelningen för datavetenskap.
    Brunström, Anna
    Karlstads universitet.
    Web metrics for the next generation performance enhancing proxies2019In: 2019 27TH INTERNATIONAL CONFERENCE ON SOFTWARE, TELECOMMUNICATIONS AND COMPUTER NETWORKS (SOFTCOM) / [ed] Begusic, D Rozic, N Radic, J Saric, M, IEEE , 2019, p. 171-176Conference paper (Refereed)
    Abstract [en]

    The fast growth of Internet traffic, the growing importance of cellular accesses and the escalating competition between content providers and network operators result in a growing interest in improving network performance and user experience. In terms of network transport, different solutions ranging from tuning TCP to installing middleboxes are applied. It turns out, however, that the practical results sometimes are disappointing and we believe that poor testing is one of the reasons for this. Indeed, many cases in the literature limit testing to the simple and rare use case of a single file download, while common and complex use cases like web browsing often are ignored or modelled only by considering smaller files. To facilitate better testing, we present a broader view which includes domain counts, flow counts and different forms of concurrency to better characterise the complexity around web pages, and from which the potential for different optimisation techniques can be estimated. We also derive numerical values of these metrics for a small set of popular web pages and study similarities and differences between pages with the same kind of content (newspapers, e-commerce and video) and between pages designed for the same platform (computer and smartphone).

  • 15.
    Arvidsson, Åke
    et al.
    Kristianstad University, Faculty of Natural Sciences, Avdelningen för datavetenskap. Kristianstad University, Faculty of Natural Sciences, Research environment of Computer science (RECS).
    Ivanovich, Milosh
    Australien.
    Fitzpatrick, Paul
    Australien.
    Modelling user experience of adaptive streaming video over fixed capacity links2021In: Performance evaluation (Print), ISSN 0166-5316, E-ISSN 1872-745X, Vol. 148, p. 1-12, article id 102199Article in journal (Refereed)
    Abstract [en]

    Streaming video continues to experience unprecedented growth. This underscores the need to identify user-centric performance measures and models that will allow operators to satisfy requirements for cost-effective network dimensioning delivered with an acceptable level of user experience. This paper presents an analysis of two novel metrics in the context of fixed capacity links: (i) the average proportion of a video’s playing time during which the quality is reduced and (ii) the average proportion of videos which experience reduced quality at least once during their playing time, based on an M/M/∞ system. Our analysis is shown to hold for the more general M/G/∞ system for metric (i), but not for (ii) and simulation studies show an unexpected form of sensitivity of metric (ii) to the flow duration distribution, contrary to the norm of increasing variance causing worse performance. At typical operational loads these new metrics provide a more sensitive and information rich guide for understanding how user experience degrades, than the widely used average throughput metric does. We further show that only the combined use of this existing and our new metrics can provide a holistic perspective on overall user performance.

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  • 16.
    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.

  • 17.
    Bao, Leiming
    et al.
    Kristianstad University, School of Health and Society.
    Sun, Chunyan
    Kristianstad University, School of Health and Society.
    Human-Computer Interaction in a Smart House2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    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.

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  • 18.
    Bengtsson, Filip
    et al.
    Kristianstad University, Faculty of Natural Science.
    Madrusan, Matteo
    Kristianstad University, Faculty of Natural Science.
    Near Field Communication Security concerns & applicable security in Android2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Near Field Communication (NFC) is being used more frequent in smart devices, this raises security concerns whether the users information is secure from attackers. The thesis examines the threats that NFC on Android smartphones are exposed to, its countermeasures, as well as existing protocols that ensures the integrity and confidentiality of the users data. The results were achieved by a literature study, a questionnaire sent to companies that create products related to the subject as well as an experiment that was divided into two parts. The first part examined what information can be extracted from a debit card stored on an Android smartphone. The second part included a relay attack in which a purchase would be made with a victim’s debit card by using Android smartphones. The results shows that it is difficult to conduct any attack on the smart devices because of the limited range of NFC as well as the protocols available for making purchases with debit cards stored on smart devices disallows unauthorized applications and hardware to attack cards stored in smart devices.

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  • 19.
    Bengtsson, Sandra
    Kristianstad University, School of Health and Society.
    “Utan sociala medier har jag varit supersocial”: En netnografisk studie av vad som sker när nätgenerationens aktiva användare av sociala medier går offline.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Much of people's everyday communication is today digital, taking place in a virtual world in which people are often more present than in the actual world. This paper deals with the consequences of active users of the net generation going offline from social media for a week. The results in this paper are based on empirical data gathered through a netnographic study carried out by observing and following 12 participants' experiences on how they were affected by being without social media for a week. Data generated in this study is the result of the participants' personal diaries, 12 completed surveys and two interviews. The purpose of the study is to find out what happens when you go against the grain in today's society and log out: How you will be affected and how it is received by the suroundings. The study shows that the participants found it difficult to be without social media at the beginning, but that they, after the study, could see several positive effects with being offline. The majority of the respondents experienced some relief in not being constantly available online. The results of this study show that the use of social media is mostly a routine habit, which you can manage without. The participants of this study have lacked communication through social media in several job and school contexts, otherwise they don’t believe that they have missed something of greater value online during the time as offline. The result also shows that the majority of the participants felt better to be offline than online, and that they will be more observant of their social media use in the future and try to cut it down. The participants consider it to be much more worthwhile to be present in the real world than in the virtual world, that they has been more social without social media. This study is an important contribution of knowledge for designers in digital technology, as studies addressing non-use is a relatively unexplored area. Mapping this kind of the non-use can be a good method to help designers to design good and user-friendly design in the future. I see this study as a preliminary study for future research of non-use where the study is ongoing for a long time.

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  • 20.
    Bergentz, Cornelia
    Kristianstad University, School of Health and Society.
    Gamification och miljö: vägen till miljövänligare transportval via motiverande spelmekanismer2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Former human activities that happened in the past affect the climate change that we see today. An environmentally friendly choice in an urban environment is to use public transport, but cars and buses emit amounts of carbon dioxide and hazardous particles. The ideal would have been to get more people to choose a bike instead of a car or public transport because the use of bicycles does not affect the environment or human health negative. A study was conducted on the gamification mechanics in order to change people’s behavior. The target group belonged mostly to the user category “free spirits” but they were also motivated by game mechanics from every user category. The results from the study conclude that if one should make use of gamification in this area then they need to work in different ways to approach different audiences and to find different groups of gamers. One should also find various game mechanics that motivate the users to be able to develop the most optimal platform for motivation.

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  • 21.
    Berntsson, Marcus
    Kristianstad University, School of Health and Society.
    Penetrationstest2014Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [sv]

    Det här arbete behandlar grunderna i penetrationstestning, vilket är en metod föratt kontrollera säkerheten i datorer och nätverk genom att försöka sätta in sig isamma tankesätt och metoder som en potentiell angripare kan ha.Den teoritiska delen går igenom processen för hur ett penetrationstest kan gå tilloch vad som är viktigt att veta och att tänka på under penetrationstestet.Det presenteras även några populära och användbara verktyg som kananvändas för penetrationstestning, nämligen Nmap, Backtack, Nessus ochMetasploit, samt en nogrann beskrivning av några av de mest vanligtvisförekommande allvarliga sårbarheterna.I genomförandedelen utförs ett penetrationstest i en labmiljö, och sätter då deninformation i den teoritiska delen i praktik. De verktygen som används gåsigenom mer detaljerat och olika metoder för att använda dessa verktyg ipenetrationstestningssyfte testas.Penetrationstestet gås igenom stegvis, och börjar med att hitta maskiner pånätverket och även hitta detaljerad information och möjligheter för angrepp. Deninformationen används sedan för att hitta sårbarheter i maskinerna, och slutligenutnyttjas dessa sårbarheter för att installera ett remote-access program och gekontrollen till den angripande datorn.

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    MB_ISMH2012_Examensarbete_Penetrationstest
  • 22.
    Bertilsson, Mattias
    et al.
    Kristianstad University College, School of Engineering.
    Lindberg, Johan
    Kristianstad University College, School of Engineering.
    Affärssystem för Gamersneed Sweden2007Independent thesis Basic level (degree of Bachelor)Student thesis
    Abstract [sv]

    This degree project deals with the creation of a business system for Gamersneed Sweden.

    The system is divided into two parts, one windows appliction and one websolution.

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    FULLTEXT01
  • 23.
    Bisiach, Jonathon
    et al.
    Kristianstad University, Faculty of Natural Science.
    Zabkar, Matej
    Kristianstad University, Faculty of Natural Science.
    Evaluating Methods for Optical Character Recognition on a Mobile Platform: comparing standard computer vision techniques with deep learning in the context of scanning prescription medicine labels2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Deep learning has become ubiquitous as part of Optical Character Recognition (OCR), but there are few examples of research into whether the two technologies are feasible for deployment on a mobile platform. This study examines which particular method of OCR would be best suited for a mobile platform in the specific context of a prescription medication label scanner. A case study using three different methods of OCR – classic computer vision techniques, standard deep learning and specialised deep learning – tested against 100 prescription medicine label images shows that the method that provides the best combination of accuracy, speed and resource using has proven to be standard seep learning, or Tesseract 4.1.1 in this particular case. Tesseract 4.1.1 tested with 76% accuracy with a further 10% of results being one character away from being accurate. Additionally, 9% of images were processed in less than one second and 41% were processed in less than 10 seconds. Tesseract 4.1.1 also had very reasonable resource costs, comparable to methods that did not utilise deep learning.

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  • 24.
    Bodell, Nicklas
    Kristianstad University, Faculty of Business.
    Effektiv webbdesign i e-handeln: Design som ökar slutförandet av köp i webbutiker2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Society is becoming increasingly more digitized and with this development e-commerce has seen continuous growth these past decades.  

    Within the growing e-commerce there is a however a big problem that has led to and continues to lead to significant monetary losses. According to current statistics over two thirds of customers online abandon their shopping carts without completing their purchases. In some cases, the reasons for this points to different emotions felt by customers which are created by how webshops are built and how they work.  

    Due to this problem this study has researched how one could apply design to increase the completion of purchases in online stores.  

    To answer this question a qualitative study was carried out in which interviews based on the research question and previous relevent research were conducted with people who frequently use online stores and who at some point have abandoned their shopping cart without completing their purchase.  

    The result of these interviews and the subsequent analysis was the finding of the two areas ”Navigation system” and ”Checkout and shopping cart” in which design can be used to increase the completion of purchases and design guidelines that are to be applied when designing these areas with the purpose of reducing shopping cart abandonment.   

    Lastly, design mockups where created to visualize these areas with the design guidelines applied.

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    effektiv_webbdesign_i_e-handeln
  • 25.
    Bratt, Ellen
    et al.
    Kristianstad University, Faculty of Business.
    Broman, Elvira
    Kristianstad University, Faculty of Business.
    Isolerad och ledsen, hur mHealth kan designas för psykisk ohälsa relaterad till isolering: Hur design kan ge fler möjligheter att få hjälp2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The goal of this thesis was to investigate how the use of digital design could help people with their mental health during the covid-19 pandemic. Covid-19 is the first and only pandemic where both mHealth and telehealth design has been well developed. Our thesis explores how design elements can increase the will of users to use mHealth applications, especially for users whose mental health has been impacted by covid-19 restrictions in the United States. Based on the scientific articles regarding mHealth design, a prototype was made. This includes inclusive design and design elements focused on people with mental health struggles. The prototype was tested by six users who all reported feeling down because of isolation during covid-19. During the study, users were asked to test the prototype and ‘think aloud’, followed by a qualitative interview to better understand the user’s experience, feelings, and thoughts on the prototype. The results show the importance of a patient's integrity, the importance of inclusive design, and the appreciation of certain design elements. The results are in line with results from previous research and offer evidence on how to design a mHealth application to support people with their mental health during a pandemic.

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    ellen.bratt_elvira.broman
  • 26.
    Buono, Vincenzo
    et al.
    Kristianstad University, Faculty of Natural Sciences.
    Petrovic, Petar
    Kristianstad University, Faculty of Natural Sciences.
    Enhance Inter-service Communication in Supersonic K-Native REST-based Java Microservice Architectures2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The accelerating progress in network speeds and computing power permitted the architectural design paradigm to shift from monolithic applications to microservices. The industry moved from single-core and multi-threads, code-heavy applications, running on giant machines 24/7 to smaller machines, multi-cores single threads where computing power and memory consumption are managed very critically. With the advent of this novel approach to designing systems, traditional multi-tier applications have been broken down into hundreds of microservices that can be easily moved around, start, and stop quickly. In this context, scaling assumed a new meaning, rather than scaling up by adding more resources or computing power, now systems are scaled dynamically by adding more microservices instances. This contribution proposes a theoretical study and a practical experiment to investigate, compare and outline the performance improvements aid by the implementation of Protocol Buffers, Google's language-neutral, binary-based representational data interchange format over traditional text-based serialization formats in a modern, Cloud-Native, REST-based Java Microservice architecture. Findings are presented showing promising results regarding the implementation of Protobuf, with a significant reduction in response time (25.1% faster in the best-case scenario) and smaller payload size (72.28% better in the best-case scenario) when compared to traditional textual serialization formats while literature revealed out-of-the-box mechanisms for message versioning with backward compatibility.

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  • 27.
    Cappelen, Birgitta
    et al.
    Oslo School of Architecture and Design.
    Andersson, Anders-Petter
    Kristianstad University, School of Health and Society.
    Design for co-creation with interactive montage2011In: Proceedings, 4th Nordic Design Research Conference, Nordes2011, School of Art and Design, Aalto University, Helsinki, Finland
May 29th - June 1st, 2011: Making Design Matter / [ed] Jung-Joo Lee, School of Art and Design, Aalto University, 2011Conference paper (Refereed)
    Abstract [en]

    Montage in cinema means to mount images andsounds from different sources, that are interpreted together and whose oppositions drive the storyfurther. In this paper we develop the montage concept further for co-creation in interactive, tactile, spatial cross-media. As case we use the design of the interactive, tangible, cross-media installation ORFI. ORFI is developed to facilitate collaboration and co-creation between children with severe disabilities and their care persons. In this paper we focus on how we have designed for interactive montage. We present two main types of interactive montage, close and shifted in three dimensions (spatial, temporal and actorial). With the first we mean spatial and temporal closeness, depending on the roles users take and the interpretations they make. With shifted we mean how to use spatial and temporal shifting and distance between the media elements in space and over time, depending on the users’ roles and interpretations. All this to encourage co-creation over time, between a variety of users in different situations.

  • 28.
    Cappelen, Birgitta
    et al.
    Oslo School of Architecture and Design.
    Andersson, Anders-Petter
    Kristianstad University, School of Health and Society.
    Expanding the role of the instrument2011In: Proceedings of the International Conference on New Interfaces for Musical Expression, 30 May - 1 June 2011, Oslo, Norway / [ed] Alexander Refsum Jensenius, Rolf Inge Godøy, Oslo University, Oslo, 2011, p. 511-514Conference paper (Refereed)
    Abstract [en]

    The traditional role of the musical instrument is to be the working tool of the professional musician. On the instrument the musician performs music for the audience to listen to. In this paper we present an interactive installation, where we expand the role of the instrument to motivate musicking and co-creation between diverse users. We have made an open installation, where users can perform a variety of actions in several situations. By using the abilities of the computer, we have made an installation which can be interpreted to have many roles. It can both be an instrument, a co-musician, a communication partner, a toy, a meeting place and an ambient musical landscape. The users can dynamically shift between roles, based on their abilities, knowledge and motivation.

     

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  • 29.
    Cappelen, Birgitta
    et al.
    Oslo School of Architecture and Design.
    Andersson, Anders-Petter
    Malmö högskola.
    From designing objects to designing fields: from control to freedom2003In: Digital Creativity, ISSN 1462-6268, E-ISSN 1744-3806, Vol. 14, no 2, p. 74-90Article in journal (Refereed)
    Abstract [en]

    In this paper we want to explore Field as a concept and as a metaphor for understanding interactive systems. By interactive systems we mean both systems and artworks, where the user by interacting changes the course of events. We intend to show why we need new terms and why we consider Field to be a fruitful concept and term. Further we will show how the Field concept changes both our understanding of what we do as designers and composers and how we acknowledge our audience. We will exemplify the design consequences of the Field concept by going through some design considerations we made when designing the audio tactile installation Mufi.

  • 30.
    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 conditions2002Conference paper (Other academic)
    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.

  • 31.
    Casian, Andrei
    et al.
    Kristianstad University, Faculty of Natural Science.
    Zannato, Martin
    Kristianstad University, Faculty of Natural Science.
    Predicting Teamfight Tactics Results with Machine Learning Techniques2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The scope of this thesis is to determine whether Machine Learning techniques used in predictingtraditional sports results are relevant in predicting electronic sports results. Moreover, it exploreswhether there is a hidden pattern in a team that leads to a win rather than just plain team composition.The selected video game from electronic sports was Teamfight Tactics. The literature study wasconducted on journals, articles and projects that predicted traditional sports outcomes, from which theMachine Learning models were collected. Literature concerning Machine Learning algorithms, theiradvantages and caveats was studied as well for the scientific background and implementation. Finallythe experiment consisted in implementing models identified in literature study and analyzing the results.The experiment showed that predicting electronic sports with Machine Learning techniques used intraditional sports is not only relevant but also more accurate, due to the complex nature of the videogame and data availability which yields a dataset with high dimensionality and data points.The secondpart of the experiment showed that indeed there is a pattern in a team that leads to higher winningchances. It was demonstrated by encoding the dataset with word2vec (encoder used in naturallanguage processing) and visualizing the data through the Embedding Projector (a tool that showspatterns in data through clusters)

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  • 32.
    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, p. 307-323Article 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.

  • 33.
    Chen, Eric Zhi
    Kristianstad University, School of Engineering.
    An explicit construction of 2-generator quasi-twisted codes2008In: IEEE Transactions on Information Theory, ISSN 0018-9448, E-ISSN 1557-9654, Vol. 54, no 12, p. 5770-5773Article in journal (Refereed)
    Abstract [en]

    Quasi-twisted (QT) codes are a generalization of quasi-cyclic (QC) codes. Based on consta-cyclic simplex codes, a new explicit construction of a family of 2-generator quasi-twisted (QT) two-weight codes is presented. It is also shown that many codes in the family meet the Griesmer bound and therefore are length-optimal. New distance-optimal binary QC [195, 8, 96], [210, 8, 104] and [240, 8, 120] codes, and good ternary QC [208, 6, 135] and [221, 6, 144] codes are also obtained by the construction.

  • 34.
    Chen, Eric Zhi
    Kristianstad University, School of Health and Society.
    Computer construction of quasi-twisted two-weight codes2009In: Proceedings of the sixth International Workshop on Optimal Codes and Related Topics, Varna, Bulgaria, 2009, p. 62-68Conference paper (Refereed)
    Abstract [en]

    A code is said two-wight if the non-zero codewords have only two different weights w1 and w2. In this paper, it is generalized that a consta-cyclic code of composite length can be put in the quasi-twisted (QT) form. Based on this result, a new computer method of QT two-weight codes is presented. A large amount of QT two-weight codes are found, and several new codes are also constructed.

  • 35.
    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, p. 60-63Conference paper (Refereed)
  • 36.
    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, p. 56-59Conference 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.

  • 37.
    Chen, Eric Zhi
    Linköping university.
    Further results on difference triangle sets1994In: IEEE Transactions on Information Theory, ISSN 0018-9448, E-ISSN 1557-9654, Vol. 40, no 4, p. 1268-1270Article in journal (Refereed)
    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.

  • 38.
    Chen, Eric Zhi
    Kristianstad University, School of Engineering.
    Good quasi-cyclic codes derived from irreducible cyclic codes2005In: Proceedings of Optimal Codes and Related Topics (OC2005), 2005, p. 74-81Conference paper (Refereed)
    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.

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    FULLTEXT01
  • 39.
    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, p. 1-10Article 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.

  • 40.
    Chen, Eric Zhi
    Kristianstad University, School of Engineering.
    New constructions of a family of 2-generator quasi-cyclic two-weight codes and related codes2007In: Proc. of 2007 IEEE Internat. Symp. on Inform. Theory, Piscataway, NJ: IEEE , 2007, p. 2191-2195Conference paper (Refereed)
    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.

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    FULLTEXT01
  • 41.
    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, p. 264-267Conference 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.

  • 42.
    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, p. 197-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.

  • 43.
    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, p. 162-165Conference paper (Refereed)
  • 44.
    Chen, Eric Zhi
    Linköping university.
    Six new binary quasi-cyclic codes1994In: IEEE Transactions on Information Theory, ISSN 0018-9448, E-ISSN 1557-9654, Vol. 40, no 5, p. 1666-1667Article in journal (Refereed)
    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.

  • 45.
    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, p. 22-22Conference 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.

  • 46.
    Chen, Eric Zhi
    et al.
    Kristianstad University, Faculty of Natural Sciences, Avdelningen för datavetenskap. Kristianstad University, Research Platform for Collaboration for Health. Kristianstad University, Faculty of Natural Sciences, Research environment of Computer science (RECS).
    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, p. 1-16Article 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.

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    fulltext
  • 47.
    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, p. 129-157Article 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.

  • 48.
    Chen, Qinqing
    et al.
    Kristianstad University, Faculty of Natural Sciences.
    Su, Xiao
    Kristianstad University, Faculty of Natural Sciences.
    Improve Improper Load Distribution with Backpack2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This article focuses on the distribution of backpack pressure on human body. We have noticed two interesting situations: whether the length of different backpack shoulder straps will change the pressure distribution of the backpack on the human body and whether different positions of the backpack load will change the pressure distribution of the backpack on the human body. To find the answer, we designed a backpack pressure detection system to collect data and use engineering software to analyse the data.We got the range that best fits the human body and the healthiest backpack: when the distance from the top of the backpack to the shoulder is about 1/5 of the length of the shoulder and the weight of the backpack is at the bottom of the backpack. At this time, the force of the three parts of the human body (shoulders, back) is the most uniform and relatively minimal. If the user wants to minimize the pressure on the shoulder, the shoulder strap of the backpack should be as short as possible. If the user only wants the pressure on the back to be minimal, the weight in the backpack is closer to the back, which is better for the back.

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    Improve Improper Load Distribution with Backpack
  • 49.
    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, p. 157-165Article in journal (Refereed)
    Abstract [en]

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

  • 50.
    ChenReddy, Suresh Reddy
    et al.
    Kristianstad University College, School of Engineering.
    Mirza, Akbar Ali Baig
    Kristianstad University College, School of Engineering.
    SMS Based Pull Campaign Processing System2007Independent thesis Basic level (degree of Bachelor)Student thesis
    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.

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    FULLTEXT01
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