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  • 201.
    Cernea, Daniel
    et al.
    University of Kaiserslautern.
    Olech, Peter-Scott
    Ebert, Achim
    Kerren, Andreas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Measuring Subjectivity: Supporting Evaluations with the Emotiv EPOC Neuroheadset2012In: Künstliche Intelligenz, ISSN 0933-1875, E-ISSN 1610-1987, Vol. 26, no 2, p. 177-182Article in journal (Refereed)
    Abstract [en]

    Since the dawn of the industrial era, modern devices and interaction methods have undergone rigorous evaluations in order to ensure their functionality and quality, as well as usability. While there are many methods for measuring objective data, capturing and interpreting subjective factors—like the feelings or states of mind of the users—is still an imprecise and usually post-event process. In this paper we propose the utilization of the Emotiv EPOC commercial electroencephalographic (EEG) neuroheadset for real-time support during evaluations and user studies. We show in two evaluation scenarios that the wireless EPOC headsets can be used efficiently for supporting subjectivity measurement. Additionally, we highlight situations that may result in a lower accuracy, as well as explore possible reasons and propose solutions for improving the error rates of the device.

  • 202.
    Cerratto Pargman, Teresa
    et al.
    Stockholm University, Dept. of Computer and Systems Sciences,.
    Järvelä, Sanna
    Oulu University, Finland .
    Milrad, Marcelo
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Designing Nordic technology-enhanced learning2012In: The Internet and higher education, ISSN 1096-7516, E-ISSN 1873-5525, Vol. 15, no 4, p. 227-230Article in journal (Refereed)
    Abstract [en]

    The latest developments of information and communication technologies (ICT) and its large penetration in different sectors of our society pose new challenges and demands in the field of education. This special issue entitled “Designing Nordic technology-enhanced learning (TEL)”, presents and discusses how researchers in the Nordic countries are currently framing and thinking about issues that are related to pedagogical design of learning spaces, digital literacies, educational professional development, design of tools engaging students in collaborative inquiry learning as well as design-oriented multimodal understandings of learning.

    The objective pursued with the special issue has been to reflect upon current problems that educational institutions, practitioners and TEL researchers are facing in the Nordic countries as regards the acknowledgment of young people's ICT practices within formal education. Such analytical work has led us to identify and elaborate on what we believe constitute forthcoming research challenges for learning and education in the Nordic countries.

  • 203.
    Cheander, Johan
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    CSI:Math: Ett undervisningsförsök med Storyline i matematik2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Storyline är en undervisningsmetod som ursprungligen kommer från Skottland. Metoden används i hela världen, men har blivit väldigt populär främst i de nordiska länderna, Danmark och Norge, men också i Sverige. Storyline är ämnesövergripande och används oftast i grundskolan. Syftet med denna studie är att undersöka hur storyline lämpar sig som undervisningsmetod i matematikundervisningen i gymnasieskolan. Undervisningsförsöket är baserat på ett utgångsmaterial som heter CSI:Math. Försöket observeras och utvärderas med en enkät och en efterföljande intervju. Utifrån resultaten av undersökningarna kan slutsatsen dras att storyline inte bara fungerar väl som arbetsmetod, utan också ligger väl i linje med de senaste förändringarna av gymnasiekurserna i matematik Gy2011.

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  • 204.
    Chowdhury, Soumitra
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Analysis of IT Related Financial Issues in Seven Companies of Sweden: Reasons Behind the Current Condition2010Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    One of the best ways to get expected results from information technology (IT) in a business organization is to have a close look at the financial issues related to it. Financial issues such as IT investment, IT costs, IT resources should be dealt with special care if any organization wants to get best result from its IT systems. The purpose of this research is to investigate the condition of IT financial issues such as IT investment, IT costs, IT resources, IT business value etc. in the selected seven organizations of Sweden and to have an understanding behind the condition. First of all, a survey has been conducted with nine IT managers from these seven organizations to get an overview of the condition of dealing with various IT financial issues. Then follow-up interviews have been conducted with four of those IT managers that took part in the survey to find out the reason behind the condition dealing with those IT financial issues. The results of the study show that most the seven companies do not have proper capital budgeting technique, benefit identification plan for IT investment. Most of them do not calculate all the IT related costs. Most of them have lack of knowledge about the business value of IT. Their knowledge of impact of IT resources is not clear. The study further shows why those seven companies are having that kind of condition regarding the IT related financial issues.

  • 205.
    Coriasco, Sandro
    et al.
    Department of mathematics, Turin's university, Italy.
    Johansson, Karoline
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Toft, Joachim
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Global wave front set of modulation space typeManuscript (preprint) (Other academic)
    Abstract [en]

    We introduce global wave-front sets WFB(f), f in S'(Rd), with respect to suitable Banach or Fréchet spaces B. An important special case is given by the modulation spaces B=M(ω,B), where ω is an appropriate weight function and B is a translation invariant Banach function space. We show that the standard properties for known notions of wave-front set extend to WFB(f). In particular, we prove that microlocality and microellipticity hold for a class of globally defined pseudo-differential operators Opt(a), acting continuouslyon the involved spaces.

  • 206.
    Cosic, Admir
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Antonio, Michel
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Processförbättring med hjälp av TMMi-Modellen: Utvärdering av en testprocess på ett medelstort företag2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Storleken och komplexiteten på dagens system och applikationer ökar. Detta leder till att kraven på system och applikationer ökar också eftersom kunderna kräver av dagens system full funktionalitet inom olika typer av distribuerade miljöer. Kunder är inte bara intresserade av funktionerna i systemen och applikationerna, de förväntar sig också att systemet skall vara av god kvalitet. Av dessa skäl är det mycket viktigt att testa system och applikationer för att säkerställa att de uppfyller kundernas förväntningar. Däremot är det inte bara själva mjukvarans kvalitets frågor som organisationer behöver ha i åtanke, en lika viktig del är själva testprocessens kvalitet. För att öka testprocessens kvalitet  krävs det en utvärdering av processen. Utvärderingen identifierar processens styrkor, svagheter och möjligheter.

    I detta examensarbete har vi utvärderat tesprocessen på ett utvecklingsföretag. Utvärderingen har baserats på anvisningar och rekommendationer från TMMi-modellen, Test Maturity Model Integrated. Vi hade som mål att lyfta fram förbättringsförslag till företagets testprocess. Efter utvärderingen kom vi fram till vilken mognadsnivå verksamheten utifrån TMMi-modellen samt en mängd förbättringsförslag för att höja mognadsnivån på testprocessen.

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  • 207.
    Crespo, Juan Carlos
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Requirements for a secure and efficientAuthentication System for a large organizationJuan Carlos2010Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this thesis, a full review on what are the minimum requirements needed to perform an Authentication System is explained. While building the system we have in consideration the users of it, the security needed for each of the resources that must be accessed by the users and what methods can be applied to access to these resources.

    In basics, an Authentication System is built when we need to keep track to who is entering on an organization, the bigger the organization is and the more information must be keep  safe the more complex the system will be.

    Although there are other methods, I tried to keep it easy and understandable for all the possible readers. With this, the reader will understand the basics that he need to keep in mind when implementing such a system like this. The organization in mind for the system is a University that consist between twenty two thousand (22.000) and twenty five thousand (25.000) users.

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  • 208.
    Csonka, Kamilla
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Användaracceptans vid systemimplementering.2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    User acceptance is an important part of all system development projects and is also a very easily influenced variable for a successful implementation. That is why it is important to have an overview of those factors that could influence the user acceptance negatively, one of those factors being delay. This thesis highlights the cohesion between a delayed project and its influence over the user acceptance. By letting a study group answer a survey formed by the Technology Acceptance Model, I have gathered the generalized opinion of the group. The results show that delay as a variable does not influence the user acceptance of this case study.

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  • 209.
    Dahal, Abhinav
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Saheb, Azal
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Architectural Agents2011Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In a complex and ever changing software environment, controlling and coordinating asoftware system's architecture and its components have become an almost an impossibletask. It takes a lot of effort from a developer and even then it is not a foolproof plan. In thisMasters thesis, we introduce Architectural Agents. Architectural agents are specializedconfigurable components. They are the key elements that make a software environmentself-adaptive. Should there be any problem in the software, the architectural agents havingmonitored the software architecture can know which component is having the problem andfix it.This thesis aims towards making software self-adaptive by using Architectural Agents.This can be achieved by combining two frameworks namely, Prism-MW and JADE. Eachof these frameworks have their own property that contribute towards achieving the goal ofthe thesis. Prism-MW decomposes a software into separate and easily manageablecomponents. JADE on the other hand, creates agents. Combining these two frameworksmeans using the agents to control the software components. This will make the softwareenvironment self-adaptive.We support our claims and theories by practically proving them.

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    Architectural Agents
  • 210.
    Dahl, Thomas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Problem-solving can reveal mathematical abilities: How to detect students' abilities in mathematical activities2012Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Dahl, Thomas (2012). Problemlösning kan avslöja matematiska förmågor. Att upptäcka matematiska förmågor i en matematisk aktivitet (Problem-solving can reveal mathematical abilities: How to detect students‟ abilities in mathematical activities). Linnéuniversitetet 2012; ISBN:978-91-86983-28-4. Written in Swedish.The thesis deals with the problem of identifying and classifying components of mathematical ability in students‟ problem-solving activities. The main theoretical framework is Krutetskii‟s theory of mathematical abilities in schoolchildren. After a short historical background focusing on the question of differentiation or integration among students on the basis of their various aptitudes for studies, the theory of mathematical ability and especially the Krutetskiian theory are described. According to Krutetskii mathematical ability should be looked upon as a structure of seven or eight different components called abilities which may appear and be subject to analysis during a mathematical activity.Krutetskii used school pupils and experimental problems to establish the relevance of his structure of abilities. However, in this work the theme is approached from the opposite perspective: If a problem and an experimental person are given, which mathematical abilities will appear and in what ways do they appear in the mathematical activity? The empirical study uses three so called “rich mathematics problems” and 98 students of which 37 study at the lower secondary school, 39 at the upper secondary school and 22 at the teacher education programme. The output data is either the written outcomes of the students‟ individual work on a problem or the recordings from small groups of students solving a problem in cooperation with their peers.In order to identify and classify abilities, the separate components of mathematical ability must be interpreted and adapted to the specific problem on which the students are working. I call this process of conformation of the abilities operationalization and the question in focus is if such an operationalization can be done successfully. The results indicate that it could be done and several examples are given which show how one or several mathematical abilities may come out more or less strongly in the mathematical activity of problem solving. The results also indicate that even low or average achieving students may show significant creative abilities. Another observation from the empirical study is that creative abilities do not seem to be more abundant among upper than lower secondary students. These two observations point out possible pathways to proceed further in the study of mathematical abilities.

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  • 211.
    Dalerstedt, Oscar
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Kommunikationssäkerhet: En fallstudie på Ringhals AB2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 212.
    Danielsson, Caroline
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Ett nytt sätt att kommunicera på jobbet: En studie av bloggens initiala påverkan i en verksamhet2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 213.
    Danylenko, Antonina
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Decisions: Algebra and Implementation2011Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Processing decision information is a constitutive part in a number of applicationsin Computer Science fields. In general, decision information can be used to deduce the relationship between a certain context and a certain decision. Decision information is represented by a decision model that captures this information. Frequently used examples of decision models are decision tables and decision trees. The choice of an appropriate decision model has an impact on application performance in terms of memory consumption and execution time. High memory expenses can possibly occur due to redundancy in a decision model; and high execution time is often a consequence of an unsuitable decision model.

    Applications in different domains try to overcome these problems by introducing new data structures or algorithms for implementing decision models. These solutions are usually domain-specificand hard to transfer from one domain to another. Different application domains of Computer Science often process decision information in a similar way and, hence, have similar problems. We should thus be able to present a unifying approach that can be applicable in all application domains for capturing and manipulating decision information. Therefore, the goal of this thesis is (i) to suggest a general structure(Decision Algebra) which provides a common theoretical framework that captures decision information and defines operations (signatures) for storing, accessing, merging, approximating, and manipulating such information along with some general algebraic laws regardless of the used implementation. Our Decision Algebra allows defining different construction strategiesfor decision models and data structures that capture decision information as implementation variants, and it simplifies experimental comparisons between them.

    Additionally, this thesis presents (ii) an implementation of Decision Algebra capturing the information in a non-redundant way and performing the operations efficiently. In fact, we show that existing decision models that originated in the field of Data Mining and Machine Learning and variants thereof as exploited in special algorithms can be understood as alternative implementation variants of the Decision Algebra by varying the implementations of the Decision Algebra operations. Hence, this work (iii) will contribute to a classification of existing technology for processing decision information in different application domains of Computer Science.

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    Licentiate Thesis (Full Text)
  • 214.
    Danylenko, Antonina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Kessler, Christoph
    Linköping University, Department for Computer and Information Science .
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Comparing Machine Learning Approaches for Context-Aware Composition2011In: Software Composition: 10th International Conference, SC 2011, Zurich, Switzerland, June 30 - July 1, 2011, Proceedings / [ed] Sven Apel, Ethan Jackson, Berlin: Springer, 2011, Vol. 6708, p. 18-33Chapter in book (Refereed)
    Abstract [en]

    Context-Aware Composition allows to automatically select optimal variants of algorithms, data-structures, and schedules at runtime using generalized dynamic Dispatch Tables. These tables grow exponentially with the number of significant context attributes. To make Context-Aware Composition scale, we suggest four alternative implementations to Dispatch Tables, all well-known in the field of machine learning: Decision Trees, Decision Diagrams, Naive Bayes and Support Vector Machines classifiers. We assess their decision overhead and memory consumption theoretically and practically in a number of experiments on different hardware platforms. Decision Diagrams turn out to be more compact compared to Dispatch Tables, almost as accurate, and faster in decision making. Using Decision Diagrams in Context-Aware Composition leads to a better scalability, i.e., Context-Aware Composition can be applied at more program points and regard more context attributes than before.

  • 215.
    Danylenko, Antonina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lundberg, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Decisions: Algebra and Implementation2011In: Machine Learning and Data Mining in Pattern Recognition: 7th International Conference on Machine Learning and Data Mining in Pattern Recognition, MLDM 2011, New York, NY, USA, August/September 2011, Proceedings / [ed] Perner, Petra, Berlin, Heidelberg: Springer, 2011, Vol. 6871, p. 31-45Chapter in book (Refereed)
    Abstract [en]

    This paper presents a generalized theory for capturing and manipulating classification information. We define decision algebra which models decision-based classifiers as higher order decision functions abstracting from implementations using decision trees (or similar), decision rules, and decision tables. As a proof of the decision algebra concept we compare decision trees with decision graphs, yet another instantiation of the proposed theoretical framework, which implement the decision algebra operations efficiently and capture classification information in a non-redundant way. Compared to classical decision tree implementations, decision graphs gain learning and classification speed up to 20% without accuracy loss and reduce memory consumption by 44%. This is confirmed by experiments.

  • 216.
    Danylenko, Antonina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Adaptation of Legacy Codes to Context-Aware Composition Using Aspect-Oriented Programming2012In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 7306, p. 68-85Article in journal (Refereed)
    Abstract [en]

    The context-aware composition approach (CAC) has shown to improve the performance of object-oriented applications on modern multi-core hardware by selecting between different (sequential and parallel) component variants in different (call and hardware) contexts. However, introducing CAC in legacy applications can be time-consuming and requires quite some effort for changing and adapting the existing code.We observe that CAC-concerns, like offline component variant profiling and runtime selection of the champion variant, can be separated from the legacy application code. We suggest separating and reusing these CAC concerns when introducing CAC to different legacy applications.

    For automating this process, we propose an approach based on Aspect-Oriented Programming (AOP) and Reflective Programming. It shows that manual adaptation to CAC requires more programming than the AOP-based approach; almost three times in our experiments. Moreover, the AOP-based approach speeds up the execution time of the legacy code, in our experiments by factors of up to 2.3 and 3.4 on multi-core machines with two and eight cores, respectively. The AOP based approach only introduces a small runtime overhead compared to the manually optimized CAC approach. For different problems, this overhead is about 2-9% of the manual adaptation approach. These results suggest that AOP-based adaptation can effectively adapt legacy applications to CAC which makes them running efficiently even on multi-core machines.

  • 217.
    Danylenko, Antonina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Context-Aware Recommender Systems for Non-functional Requirements2012In: Third International Workshop on Recommendation Systems for Software Engineering (RSSE 2012), 2012, p. 80-84Conference paper (Refereed)
    Abstract [en]

    For large software projects, system designers have to adhere to a significant number of functional and non-functional requirements, which makes software development a complex engineering task. If these requirements change during the development process, complexity even increases. In this paper, we suggest recommendation systems based on context-aware composition to enable a system designer to postpone and automate decisions regarding efficiency non-functional requirements, such as performance, and focus on the design of the core functionality of the system instead.

    Context-aware composition suggests the optimal component variants of a system for different static contexts (e.g., software and hardware environment) or even different dynamic contexts (e.g., actual parameters and resource utilization). Thus, an efficiency non-functional requirement can be automatically optimized statically or dynamically by providing possible component variants. Such a recommender system reduces time and effort spent on manually developing optimal applications that adapts to different (static or dynamic) contexts and even changes thereof.

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  • 218.
    Danylenko, Antonina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Zimmermann, Wolf
    Martin-Luther-Universität Halle Wittenberg, Institut für Informatik.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Decision Algebra: Parameterized Specification of Decision Models2012In: WADT 2012: 21st International Workshop on Algebraic Development Techniques, 7-10 June, 2012, Salamanca, Spain ; Technical report TR-08/12 / [ed] Narsio Martí-Oliet, Miguel Palomino, 2012, p. 40-43Conference paper (Refereed)
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  • 219.
    Danylenko, Oleg
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Scheduling Stream Processing on Multi-Core Processors2011In: Fourth Swedish Workshop on Multicore Computing / [ed] Christoph Kessler, Linköping, Sweden: Linköping University , 2011, p. 136-Conference paper (Refereed)
    Abstract [en]

    Stream processing applications map continuous sequences of input data blocks to continuous sequences of output data blocks. They have demands on throughput of blocks or response time for each data block. We present theoretical bounds on the degree of parallelism of such applications, their throughput and response time. Based on these bounds, we develop scheduling heuristics for different optimization and constraint problems of stream processing applications involving throughput and response time. These results direct the manual implementation of efficient stream processing applications and will, on the long run, help generating them automatically.

  • 220.
    Danylenko, Oleg
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Rydström, Sara
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Comparing Implementation Platforms for Real-Time Stream Processing Systems on Multi-Core Hardware2011In: Proceedings of the 23rd IASTED International Conference: Parallel and Distributed Computing and Systems / [ed] T. Gonzalez, Calgary, AB, Canada: ACTA Press, 2011, p. 235-243Chapter in book (Refereed)
    Abstract [en]

    Today there exist many programming models and platforms for implementing real-time stream processing systems. A decision in favor of the wrong technology might lead to increased development time and costs. It is, therefore, necessary to decide which alternatives further efforts should concentrate on and which may be forgotten. Such decisions cannot be based sole on analytical comparisons; the present experiment seeks to complement analytical with empirical results.

    More specifically, the paper discusses the results of comparing programmability and performance of one and the same real-world real-time stream processing system implemented using three different alternative implementation platforms: C++ as a general-purpose programming language, IBM InfoSphere Streams as a dedicated stream processing platform, and MatLab as the technical computing system preferred in the application domain. As a result: system implementation based on MatLab was easiest, the C++ based implementation outperformed the others in response time, while InfoSphereStreams led to the highest data throughput. Altogether, the results give a picture of advantages and disadvantages of each technology for our real-time stream processing system. More empirical studies ought to provide similar empirical knowledge to help decide which technology to use for solving particular stream processing problems.

  • 221.
    D'Ariano, M.
    et al.
    University of Pavia, Italy .
    Fei, S.- M.Capital Normal University, Bejing.Haven, E.University of Leicester, United Kingdom.Hiesmayr, B.University of Vienna, Austria .Jaeger, G.Boston University, United States.Khrennikov, AndreiLinnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.Larsson, J. - Å.Linköping University, Sweden .
    Foundations of Probability and Physics-62012Conference proceedings (editor) (Refereed)
  • 222.
    Dautbegovic, Dino
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Chirp Sounding and HF Application: SDR Technology Implementation2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    From a HF propagation point of view, the ionospheric layers act as partially conducting media (plasma) in which a transmitted radio wave can reflect upon.A way of determining whether a radio wave with a given frequency will reflect from the ionosphere or completely penetrate is to utilize special radar instruments know as ionosondes or chirp sounders. The technique is widely used by amateur enthusiasts and military radio users for monitoring available radio channel links between two remote locations and can often serve as a base for HF radio prognoses.The objective of this Bachelor’s Thesis was to explore, implement and test a single channel receiver for monitoring ionospheric sounders. The implementation is based on Software Defined Radio (SDR) technology and relies on the GNU Chirp Sounder (gcs) open source script program.

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  • 223.
    Davidsson, Mattias
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    A Mobile Application with Embodied Multimodal Interactions for Understanding Representations of Motion in Physics2012In: IADIS International Conference Mobile Learning 2012 Berlin, Germany11-13 March 2012, 2012Conference paper (Refereed)
    Abstract [en]

    Current research in the Learning Sciences points out different methods and approaches to enhance and assist students in their learning and understanding of mathematical representations of the underlying physics of everyday situations. One of the aims of this paper is to address how mobile applications can be designed to support some of the pedagogical challenges associated with learners´ understanding of different graphical representations of motion – e.g. displacement as a function of time, velocity as a function of time, and how these couple to the actual motion, to each other, as well as to other mathematical representations of motion such as functions, equations and descriptive text. A prototype design is presented including a new type of application, or app, for mobile and in classroom use, using touch- and gesture based technology. One of the specific aims of this set of applications is to spur the learners exposure to, interaction with, as well as creation of multiple and multimodal representations of physical everyday phenomena involving motion, in a personal inquiry-based approach that could involve both informal as well as formal learning activities.  

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  • 224.
    Davidsson, Mattias
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Johansson, David
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lindwall, Katrin
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Exploring the Use of Augmented Reality  to Support Science Education in Secondary Schools2012In: 2012 IEEE Seventh International Conference on Wireless, Mobile and Ubiquitous Technology in Education - Proceedings / [ed] Bob Werner, Los Alamitos: IEEE Press, 2012, p. 218-220Conference paper (Refereed)
    Abstract [en]

    During the last 2 years we have conducted several trials exploring how augmented reality and mobile technologies can be used to support learning and teaching in science education. In particular, we present the on-going efforts that are part of the EU funded project Science Center To Go. We provide an overview of the different activities, the lessons learned and what we propose as ways to forward making the technology, mobile, affordable and in the long term – ubiquitous available.

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  • 225.
    De La Fuente, Jesus Miguel
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Visualization in Genealogical Data: Genealogical tree application for Facebook2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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    Report Thesis
  • 226.
    de Muga Blasco, Javier
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Implementation of a 2D Graph Viewer2010Independent thesis Advanced level (degree of Master (One Year))Student thesis
    Abstract [en]

    The VizzAnalyzer tool is a program analysis tool with a 3D visualization component calledVizz3D. It is used for visualizing the graphs created in the VizzAnalyzer using differentmetaphors and layout algorithms. This tool is rather heavy weight and not well integratedinto Eclipse.In order to view small graphs created by the VizzAnalyzer directly in Eclipse weimplemented a 2D graph viewer as an Eclipse View Plug-in which is able to view, layoutand manipulate graphs stored as Grail graphs with a nice interface.The master thesis describes the background and architecture of Eclipse and third partytools used, mainly Grail, Zest, Draw2D and SWT. It also documents how the Graph 2DViewer has been developed and implemented besides a brief guide for the GUI.

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  • 227. Dechesne, Francien
    et al.
    Hattori, Hattoriter Mors, AdriaanSuch, Jose MiguelWeyns, DannyLinnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.Dignum, Frank
    Advanced Agent Technology: Aamas Workshops 2011, Ample, Aose, Arms, Docmas, Itmas, Taipei, Taiwan, May 2-6, 2011. Revised Selected Papers2012Conference proceedings (editor) (Refereed)
  • 228.
    Dedovic, Anel
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Framgångsfaktorer för en mer lärande organisation: En studie av en industriverksamhet2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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  • 229.
    Deiters, Wolfgang
    et al.
    Fraunhofer ISST, Dortmund, Germany.
    Mirijamdotter, Anita
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Sandkuhl, Kurt
    Jönköping University.
    ILOG 2010 Workshop Chairs’ Message2010In: BIS 2010 International Workshops, Berlin, Germany, May 3-5, 2010. Revised Papers / [ed] Abramowicz, W., Tolksdorf, R., and Węcel, K., New York: Springer, 2010, p. 156-157Chapter in book (Other academic)
    Abstract [en]

    For many enterprises, it is of decisive strategic importance to optimize the internal information flow and to implement an efficient reuse of existing knowledge. Especially in knowledge-intensive industry and service sectors, information is a major factor in production processes, and knowledge reflects an important asset of the enterprise. Similarly, public organizations and governmental bodies are dependent on accurate and timely information supply for efficient and high quality processes and services. Intelligent information supply has become an important issue that is characterized by just-in-time, demand-oriented and context-sensitive information.

  • 230.
    Demaria, Daniel
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Risk and risk management practices within Information systemoutsourcing2011Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    Information systems (IS) outsourcing is one aspect of outsourcing, whereservice or activities of IS are contracted out to the third party management toobtain a required result. The most outsourced information systems (IS)function of higher learning institutions is information technology (IT)infrastructure, application management, and E-learning. Beside the advantagesIS outsourcing brings , it faces risks and requires effective management fromthe outset of the outsourcing evaluation through the life of the contractualrelationship. The aim of the thesis was to study the risks associated with ISoutsourcing and the management of these risks within the context of privatehigher learning institutions in Ethiopia. The strategy of inquiry used is a casestudy strategy. For data collection, I interviewed ten individuals havingimportant roles in the IS outsourcing process such as chief information officer,Chief Network Officer Chief Software Development Officer and also users anddomain experts. The research employed a qualitative research method. For thisreason, the research result largely drawn from the analysis of the interviews.After analysing the interviews, an inductive qualitative research approach wasused to draw conclusions. A single case design and narrative approach wasused for analysing the interview. Finally findings revealed that even though theparticipants of the university understood what outsourcing IS is all about, theuniversity doesnot have documented and structured outsourcing strategyprogram. The study help also discovering the fact that there are no riskmanagement frameworks for IS outsourcing projects. IS outsourcing project ismanaged like any other system projects. In the private higher learninginstitution the achievements of service level agreement (SLA) requirementshave a great importance in the performance monitoring of the outsourced ISfunctions. The participation of users with any type of IS outsourcing project isvery high but the involvement of the top level management is unsatisfactory.

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    Risk and risk management practices within Information system outsourcing
  • 231.
    Dhasarathan, Iyyappan
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Rathinasamy, Vimal
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Cui, Tang
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Wavelet Based SPIHT Compression for DICOM Images2011Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    Generally, image viewers do not include the scalability for the image compressionand ecient encoding and decoding for easy transmission. They alsonever consider the specic requirements of the heterogeneous networks constitutedby the Global Packet Radio Service(GPRS), Universal Mobile TelecommunicationSystem(UMTS), Wireless Local Area Network(WLAN) and DigitalVideo Broadcasting(DVB-H). This work contains the medical application withviewer for the Digital Imaging and Communications in Medicine(DICOM) imagesas its core content. This application discusses the scalable wavelet-basedcompression, retrival and the decompression of the DICOM images. This proposedapplication is compatible with the mobile phones activated in the heterogeneousnetwoks. This paper also explains about the performance issues whenthis application is used in prototype heterogenous networks.

    Download full text (pdf)
    Wavelet Based SPIHT Compression for DICOM Images
  • 232.
    Dinh, Quyen
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Phan, Martin
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Användningen av olika informations- och kommunikationskanaler inom företag2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Information and communication channels have a major influence in terms of the success of companies. Studies have shown that many organizational changes will result in negative effects due to insufficient communication. This may be because either too few or too many channels are being used.

     

    The purpose of this thesis was to provide descriptive knowledge about the communication channels used internally within the company. The thesis also contributed to extended information about the differences in the use of information and communication channels between large companies and small businesses.

     

    Various theories were described in a theory chapter that had been used in the thesis research. Theories which were raised included the internal communication as well as different communication channels being used. In the same field of research, the results from a previous research were also presented in the theory chapter.

     

    The thesis was written with a deductive approach. The empirical data was gathered through the use of quantitative and qualitative data collection methods. Interviews were carried out on site by personally contacting various companies as well as through surveys sent out via email.

     

    Based on the empirical research, the results from 47 different companies were compiled in the form of tables. The tables presented included information and communication channels used, and a comparison of the use of channels of different company sizes. The four most used channels out of the 23 were face-to-face meetings, telephone, email and intranet.

     

    The results were discussed in a discussion chapter where connections to the theories were made. Discussions about the use of channels in different sizes of companies were made where it was discovered that among other things, the intranet is a channel being used significantly more by larger companies than smaller ones. A comparison was made between the thesis and the previous research results. The comparison proved to be similar to the research

     

    Our conclusion was that face-to-face communication was the one most widely used among companies. The main difference between the smaller and larger companies was that smaller companies use fewer channels. It has been shown that only 10% of companies in our study utilize the social media channel for internal communication.

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    Kommunikationskanaler
  • 233.
    Doroci, Bedrie
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Matematik i förskolan: En studie av måltidssituationer2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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  • 234. Durand, Fabien
    et al.
    Fan, Ai-Hua
    Khrennikov, Andrei
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lin, Dongdai
    Vivaldi, Franco
    Wang, Yuefei
    Vladimir Sergeevich Anashin2011In: P-Adic Numbers, Ultrametric Analysis, and Applications, ISSN 2070-0466, E-ISSN 2070-0474, Vol. 3, no 4, p. 359-362Article in journal (Other academic)
  • 235.
    Dzhekova, Tsvetelina
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Quality of service and handover priority into third generation and fourth generation mobile networks2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Day by day the telecommunications are developing and everyone is striving for best quality and service. Quality of service (QoS) is one of the most important factors in the world of telecommunications. QoS plays important role in handover. There are different handovers. The thesis describes vertical handovers. If you want seamless handover the network should provide better Quality of service. My purpose is to examine different seamless vertical handovers and help the user to choose the better network for seamless and advantageous handover.

  • 236.
    Ebbelind, Andreas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Analysing the Discourse of Teacher Training2012Conference paper (Refereed)
  • 237.
    Ebbelind, Andreas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Roos, Helena
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Nilsson, Per
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Learning fractions: transformations between representations from a social semiotic perspective of multimodality2012In: Proceedings of Norma 11: The Sixth Nordic Conference on Mathematics Education / [ed] Gunnarsdottir, Hreinsdottir, Palsdottir, Hannula, Hannula-Sormunen, Jablonka, Jankvist, Ryve, Valero and Waege., University of Iceland Press, 2012, p. 217-226Conference paper (Refereed)
    Abstract [en]

    This study presents a tentative framework for studying the learning of fractions in the context of transformations between different forms of representations. The framework is used in an empirical sample of how eight 10-year-old students express understanding of activities which were developed to challenge them to reflect on different ways of representing aspects of the concept of fractions. The framework is based on a social semiotic perspective of multimodality.

    The analysis discloses how the framework helps in structuring our understanding of the interplay between representations in the learning of fractions. Specifically, we saw how concrete physical material and gestures complemented the symbolic and spoken language in the students’ solution strategies of different tasks. 

  • 238.
    Eberhagen, Niclas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Understanding the Designing of Knowledge Work Support Tools as a Situated Practice2011Doctoral thesis, monograph (Other academic)
    Abstract [en]

    The aim of the thesis is twofold. First, a need is exposed for adopting a situated design perspective in designing computer-based tools that support knowledge work. Second, an examination is made of what this perspective may reveal concerning the nature of processes and relations within the design situation. This is done to understand better what it means for users and developers, as well as other stakeholders, to approach and capture the tacit knowing within the work context.

    The argument for adopting a situated design perspective is based on experience drawn from development projects, as well as literature reviews. In these projects, the design situations encountered are best characterized as explorative and iteratively interpreted. Here, approaching and understanding the work context, together with the users, has at best been a pursuit of the vision of the future system guided by local circumstances, and where the users had difficulties in expressing and understanding what it is they want and how they want it. This implies that formal engineering methods, where the development work is reduced to an engineering endeavor based on a rationalistic perspective, are not sufficient.

    The situated design perspective is presented in this thesis as a conceptual model of the design practice, highlighting its constituent worlds, processes, and relations. The model depicts designing as an explorative and sense-making process, navigating between what is wanted or envisioned and what may be negotiated and discovered. It emphasizes the importance of the artifact being designed as a means to capture, communicate, and discover what is possible in the work context. The model makes clear that the design process is highly situated, and that it cannot take place outside the work context because of interdependent relationships. It is designing within the living work context, not design for an objectified one. Thus, it cannot be planned as a pure engineering endeavor, but needs to be viewed as a situated practice.

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  • 239.
    Eberhagen, Niclas
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Aidemark, Jan
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Surfing the wave: organizational learning and wikis2010In: Vision and Reality in Community Informatics. CIRN-DIAC Conference Proceedings: Prato, Italy 27-29 October 2010 / [ed] Gomez, R., & Stillman, L., CCNR Monash University, Information School, University of Washington , 2010Conference paper (Refereed)
    Abstract [en]

    This paper investigates driving forces and hinders for collaborative knowledge creation, and the influence of IT-support technologies. We look at the use of wikis in learning in situation and the problems and possibilities for support of learning processes. The focus is on organizational learning, however not many reports are to be found on this topic. To gain some initiating insight into how to support organizational learning we look at some evidence from education. An overview from past studies and some evidence from our own use of wikis are used as a base for suggestion for the possibilities of wikis. Some important problems to be addressed before launching a corporate wiki include are discussed.

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    fulltext
  • 240.
    Edvinsson, Marcus
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Parallelized Program Analysis2010Doctoral thesis, monograph (Other academic)
    Abstract [en]

    This thesis presents a framework for parallelized program analysis. It uses available parallel processing power in standard desktop computers to speed up static program analysis.

    Today, processor chip manufacturers produce single processor chips containing multiple cores, each with a processing power of previous single-core processors. Major processor suppliers have released processors with 2, 4, and 6 cores and are currently working on processors with 8 and 16 cores, and are expected to produce processors with a few hundred cores in the near future.

    Static program analysis finds programs’ runtime properties at compile time. It is time-consuming to produce results of high quality, which is necessary for the results to be useful. One way to reduce analysis time is to take advantage of the processing power of multi-core processors.

    The presented framework supports sequences of static program analyses, each producing partial results. In this thesis, the framework is instantiated with points-to analysis, reachability analysis, and escape analysis. Points-to analysis calculates object references in a program and provides the input for subsequent analyses. Reachability analysis calculates reachable methods and provides further input to the escape analysis, which finds object and method lifetimes. It is possible to implement other data-flow analyses using the same parallelized approach by choosing different analysis value types and transfer functions. The framework also facilitates the implementation of static analyses that automatically benefit from the parallelized approaches that the framework offers.

    The framework shortens the analysis time for static program analysis based on points-to analysis in two ways: using a parallelized approach for points-to analysis, and using parallelized approaches for analyses relying on points-to analysis results. It is also possible to shorten the development time of other analyses when reusing the functionality of the framework.

    To further improve the usefulness of the framework, requirements for additional static analysis should be captured, and the framework should be extended accordingly. It should also facilitate to perform independent client analyses in parallel, rather than in sequence. These challenges are part of our future work.

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    EdvinssonPPA
  • 241.
    Edvinsson, Marcus
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lundberg, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Parallel Data-Flow Analysis for Multi-Core Machines2011Conference paper (Refereed)
    Abstract [en]

    Static program analysis supporting software development is often part of edit-compile-cycles, and precise program analysis is time consuming. Points-to analysis is a data-flow-based static program analysis used to find object references in programs. Its applications include test case generation, compiler optimizations and program understanding, etc. Recent increases in processing power of desktop computers comes mainly from multiple cores. Parallel algorithms are vital for simultaneous use of multiple cores. An efficient parallel points-to analysis requires sufficient work for each processing unit.

    The present paper presents a parallel points-to analysis of object-oriented programs. It exploits that (1) different target methods of polymorphic calls and (2) independent control-flow branches can be analyzed in parallel. Carefully selected thresholds guarantee that each parallel thread has sufficient work to do and that only little work is redundant with other threads. Our experiments show that this approach achieves a maximum speed-up of 4.5.

  • 242.
    Edvinsson, Marcus
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lundberg, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Parallel Points-to Analysis for Multi-Core Machines2011In: 6th International Conference on High-Performance and Embedded Architectures and Compilers - HIPEAC 2011, 2011Conference paper (Refereed)
  • 243.
    Edvinsson, Marcus
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Lundberg, Jonas
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Parallel Reachability and Escape Analysis2010In: 2010 10th IEEE Working Conference on Source Code Analysis and Manipulation (SCAM), IEEE Press, 2010, p. 125-134Conference paper (Refereed)
    Abstract [en]

    Static program analysis usually consists of a number of steps, each producing partial results. For example, the points-to analysis step, calculating object references in a program, usually just provides the input for larger client analyses like reachability and escape analyses. All these analyses are computationally intense and it is therefore vital to create parallel approaches that make use of the processing power that comes from multiple cores in modern desktop computers.

    The present paper presents two parallel approachesto increase the efficiency of reachability analysis and escape analysis, based on a parallel points-to analysis. The experiments show that the two parallel approaches achieve a speed-up of 1.5 for reachability analysis and 3.8 for escape analysis on 8 cores for a benchmark suite of Java programs.

     

  • 244.
    Edvinsson, Marcus
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Löwe, Welf
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    A Multi-Threaded Approach for Data-Flow Analysis2010Conference paper (Refereed)
    Abstract [en]

    Program analysis supporting software development is often part of edit-compile-cycles, and precise program analysis is time consuming. With the availability of parallel processing power on desktop computers, parallelization is a way to speed up program analysis. This requires a parallel data-flow analysis with sufficient work for each processing unit. The present paper suggests such an approach for object-oriented programs analyzing the target methods of polymorphic calls in parallel. With carefully selected thresholds guaranteeing sufficient work for the parallel threads and only little redundancy between them, this approach achieves a maximum speed-up of 5 (average 1.78) on 8 cores for the benchmark programs.

  • 245.
    Efimova Hagsröm, Inga
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Matematiskt resonemang på högstadiet: En studie av vilka strategier högstadieelever väljer vid matematiska resonemangsföringar2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is to examine secondary school students’ strategies of reasoning. The study inquires into which strategies students choose when reasoning mathematically as well as differences and similarities between the younger students’ solutions and the older students’ solutions.

    The study was conducted in two classes, in years 8 and 9 respectively, at a secondary school. The students were asked to solve tasks, which encouraged them to reason mathematically, on individual basis. The study revealed that the majority of students had chosen to reason deductively. The comparison of students’ presented answers in two years showed that the ninth-graders’ solutions are characterized of greater skill when it comes to algebraic demonstrations. The results of the study also reveal that students with stronger algebraic abilities attempt more often to generalize the given mathematical statements further.

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    FULLTEXT01
  • 246.
    Einarsson, Katrina
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Karlsson, Yvonne
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Matematikuppgifters språkliga dräkt - hjälp eller hinder?2010Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study was to examine how the linguistic costume in

    mathematical tasks affects students' ability to solve the task. The focus of the

    investigation was on students with mathematics difficulties.

     

    Based on the theories of various difficulties in language design and how it can

    effect in Mathematics and Swedish, the investigation was focused on the

    categories signal words, contextualization and the strengthening of the

    illustration. Six tasks were selected from textbooks to be reformulated in two

    variants each. The investigation began as a quantitative survey in year four,

    where students were to solve six tasks. Based on the results pupils were selected

    for interviews about mathematical texts. The interviewed pupils belonged to the

    defined group.

     

    The results show that the pupils easier can find answers when there is a signal

    word in the task. They react in different ways when they have to solve a task in

    mathematic. Some pupils have enough confidence to think they can solve it,

    while others feel that the task can not be solved. Students with mathematics

    difficulties avoid writing calculations and units of the answers.

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    FULLTEXT01
  • 247.
    Ek, Christoffer
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Singular Value Decomposition2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Digital information transmission is a growing field. Emails, videos and so on are transmitting around the world on a daily basis. Along the growth of using digital devises there is in some cases a great interest of keeping this information secure.

    In the field of signal processing a general concept is antenna transmission. Free space between an antenna transmitter and a receiver is an example of a system. In a rough environment such as a room with reflections and independent electrical devices there will be a lot of distortion in the system and the signal that is transmitted might, due to the system characteristics and noise be distorted.

    System identification is another well-known concept in signal processing. This thesis will focus on system identification in a rough environment and unknown systems. It will introduce mathematical tools from the field of linear algebra and applying them in signal processing. Mainly this thesis focus on a specific matrix factorization called Singular Value Decomposition (SVD). This is used to solve complicated inverses and identifying systems.

    This thesis is formed and accomplished in collaboration with Combitech AB. Their expertise in the field of signal processing was of great help when putting the algorithm in practice. Using a well-known programming script called LabView the mathematical tools were synchronized with the instruments that were used to generate the systems and signals.

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    Singularvaluedecomposition
  • 248.
    Eklund, Per
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Forsman, Olof
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Personuppgiftslagens efterlevnad i samband med IT-övervakning: En studie av medelstora callcenterverksamheter2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In the 2003:3 and 2005:3 reports issued by the Swedish Data Inspection Board, the authority examined the treatment of personal data related to employer surveillance of employees. The reports indicated flaws occurring in regard to the Personal Data Act in several of the examined businesses.

    In reference to this, a case study of a mid-sized call center was conducted to examine, from a technical point of view, the degree of compliance with the Personal Data Act regarding the company's surveillance of its employees. Based upon flaws found in the case study, a minor survey of similar companies was conducted in an attempt to measure the degree of generalizability of the identified flaws.

    The flaws identified in the case study are mainly related to unsatisfactory routines for sorting out personal data during e-mail surveillance and lack of information given to employees about the conducting of checks related to this. A need to update the company's corporate IT policy and a need for a web surveillance solution were also noted.

    The survey has indicated that similar flaws regarding screening routines and lack of information also might occur at other mid-sized call center companies.

    The conclusion of the study is that several of the flaws the Swedish Data Inspection Board discovered five years ago still seem to be applicable among some mid-sized call center companies.

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    FULLTEXT01
  • 249.
    Eklöf, Cathrine
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Johansson, Pernilla
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    "Matematikens mål har funnits hela tiden i läroplanen": En studie om pedagogers inställning till matematik utifrån styrdokumenten2011Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med vår studie är att försöka synliggöra och jämföra pedagogers medvetenhet och yrkeserfarenhet kring deras inställning till matematik utifrån förskolans styrdokument, då förskolan i dagarna står inför en reviderad läroplan. För att kunna ge en beskrivning till vad pedagoger anser om matematikens roll i förskolan genomförde vi en enkätundersökning först som sedan utgjorde ett underlag för några semistrukturerade intervjuer. Urvalsgruppen bestod av förskollärare och barnskötare med olika lång tids erfarenhet av att arbeta i förskola. Efter att ha genomfört denna undersökning visar resultatet att läroplaner, yrkeserfarenhet och utbildning påverkar pedagogers syn på matematikens betydelse i förskolan. Anmärkningsvärt var att det var de pedagoger med längst erfarenhet av yrket som oftare vidhöll läroplanens betydelse. Vår tolkning av det resultatet är att flera år av praktiskt arbete i verksamheten leder till en större förståelse av vad målen innebär praktiskt.

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    fulltext
    Download full text (pdf)
    GO7982_EX,ARBETE_PJ&CE♥
  • 250.
    Elebro, Sara
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Den Sociala Resan: – Hur kan sociala medier öka interaktionen mellan företag och kund?2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Social media has been developed enormously due to the increased use of internet. Technological advancements have led to more possibilities for direct communication for private persons as well as companies. This has been noticed and utilized in the advancement of communication. The earlier accepted media strategies have due to this development been contested since social media has a flatter hierarchy than earlier media. This has caused a need for updated research in communication in social media. Factors which are important for communication in social media between company and client is therefore highlighted in this report.  These factors are examined inductively through interviews with clients and companies together with analysis of existing web pages with social media and how these are used by companies. By concentrating common problem areas it is possible to produce a list of appropriate design principles. These are used in a action plan on behalf of the case study project Bästa Resan. The purpose of the action plan is to contribute to an increase of the travelling by public transportation in Västernorrlands län by the usage of social media.

     

    The clients state a will to manage the contact with companies in public transportation mainly through telephone, e-mail or surveys. Telephone texts are considered very positive in situations where shorter texts about acute matters like traffic delays are possible to send out. The companies are positive about the development of social media and states lack of resources as the prime reason that the use of social media within the company is not as extensive as possible. The swot-analyses shows a good foundation for further development of social media.

     

    The reports result shows that social media should be developed on consideration for what target group is aimed to be reached, which purpose the company has and also what kind of information is to be mediated.

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