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  • 1.
    Abbaneo, Chiara
    et al.
    Ansaldo STS, Italy.
    Flammini, Francesco
    Ansaldo STS, Italy ; University of Naples ”Federico II”, Italy.
    Lazzaro, Armando
    Ansaldo STS, Italy.
    Marmo, Pietro
    Ansaldo STS, Italy.
    Mazzocca, Nicola
    Université “Federico II” di Napoli, Italy.
    Sanseviero, Angela
    Ansaldo STS, Italy.
    UML based reverse engineering for the verification of railway control logics2007In: Proceedings of International Conference on Dependability of Computer Systems, DepCoS-RELCOMEX 2006, IEEE, 2007, p. 3-10Conference paper (Refereed)
    Abstract [en]

    The Unified Modeling Language (UML) is widely used as a high level object oriented specification language. In this paper we present a novel approach in which reverse engineering is performed using UML as the modelling language used to achieve a representation of the implemented system. The target is the core logic of a complex critical railway control system, which was written in an application specific legacy language. UML perfectly suited to represent the nature of the core logic, made up by concurrent and interacting processes, using a bottom-up approach and proper modeling rules. Each process, in fact, was strictly related to the management of a physically (resp. logically) well distinguished railway device (resp. functionality). The obtained model deeply facilitated the static analysis of the logic code, allowing for at a glance verification of correctness and compliance with higher-level specifications, and opened the way to refactoring and other formal analyses. © 2006 IEEE.

  • 2.
    Abboud, Mohamad Moulham
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Simulation of 3ph induction motor in Matlab with Direct and Soft starting methods.2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Asynchronous machines are considered nowadays the most commonly used electrical machines, which are mainly used as electrical induction motors. Starting the induction motor is the most important and dangerous step. The theory behind this project is based on representing the real motor by a set of equations and values in Matlab using the subsystem feature, forming a corresponding idealistic motor in a way where all the physical effects are similar. The motor is started under different loads in two methods: Direct and Soft starting. Each method is studied and discussed using supporting simulation of currents, torque, speed, efficiency and power factor curves.

  • 3.
    Abedan Kondori, Farid
    et al.
    Umeå universitet.
    Yousefi, Shahrouz
    KTH Royal Institute of Technology.
    Li, Haibo
    KTH Royal Institute of Technology.
    Direct three-dimensional head pose estimation from Kinect-type sensors2014In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 50, no 4, p. 268-270Article in journal (Refereed)
    Abstract [en]

    A direct method for recovering three-dimensional (3D) head motion parameters from a sequence of range images acquired by Kinect sensors is presented. Based on the range images, a new version of the optical flow constraint equation is derived, which can be used to directly estimate 3D motion parameters without any need of imposing other constraints. Since all calculations with the new constraint equation are based on the range images, Z(xyt), the existing techniques and experiences developed and accumulated on the topic of motion from optical flow can be directly applied simply by treating the range images as normal intensity images I(xyt). In this reported work, it is demonstrated how to employ the new optical flow constraint equation to recover the 3D motion of a moving head from the sequences of range images, and furthermore, how to use an old trick to handle the case when the optical flow is large. It is shown, in the end, that the performance of the proposed approach is comparable with that of some of the state-of-the-art approaches that use range data to recover 3D motion parameters.

  • 4.
    Abraham, Erika
    et al.
    RWTH Aachen University, Germany.
    Bekas, Costas
    IBM Research, Switzerland.
    Brandic, Ivona
    Vienna University of Technology, Austria.
    Genaim, Samir
    Complutense University of Madrid, Spain.
    Johnsen, Einar
    University of Oslo, Norway.
    Kondov, Ivan
    Karlsruhe Institute of Technology, Germany.
    Pllana, Sabri
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Streit, Achim
    Karlsruhe Institute of Technology, Germany.
    Preparing HPC Applications for Exascale: Challenges and Recommendations2015In: Proceedings: 2015 18th International Conference on Network-Based Information Systems, NBiS 2015 / [ed] Barolli, L; Takizawa, M; Hsu, HH; Enokido, T; Xhafa, F, IEEE conference proceedings, 2015, p. 401-406Conference paper (Refereed)
    Abstract [en]

    While the HPC community is working towards the development of the first Exaflop computer (expected around 2020), after reaching the Petaflop milestone in 2008 still only few HPC applications are able to fully exploit the capabilities of Petaflop systems. In this paper we argue that efforts for preparing HPC applications for Exascale should start before such systems become available. We identify challenges that need to be addressed and recommend solutions in key areas of interest, including formal modeling, static analysis and optimization, runtime analysis and optimization, and autonomic computing. Furthermore, we outline a conceptual framework for porting HPC applications to future Exascale computing systems and propose steps for its implementation.

  • 5.
    Achilleos, Achilleas
    et al.
    Frederick University, Cyprus.
    Mettouris, Christos
    University of Cyprus, Cyprus.
    Yeratziotis, Alexandros
    University of Cyprus, Cyprus.
    Papadopoulos, George
    University of Cyprus, Cyprus.
    Pllana, Sabri
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Huber, Florian
    SYNYO GmbH, Austria.
    Jäger, Bernhard
    SYNYO GmbH, Austria.
    Leitner, Peter
    SYNYO GmbH, Austria.
    Ocsovszky, Zsófia
    BioTalentum Ltd, Hungary.
    Dinnyés, András
    BioTalentum Ltd, Hungary.
    SciChallenge: A Social Media Aware Platform for Contest-Based STEM Education and Motivation of Young Students2018In: IEEE Transactions on Learning Technologies, ISSN 1939-1382, E-ISSN 1939-1382Article in journal (Refereed)
    Abstract [en]

    Scientific and technological innovations have become increasingly important as we face the benefits and challenges of both globalization and a knowledge-based economy. Still, enrolment rates in STEM degrees are low in many European countries and consequently there is a lack of adequately educated workforce in industries. We believe that this can be mainly attributed to pedagogical issues, such as the lack of engaging hands-on activities utilized for science and math education in middle and high schools. In this paper, we report our work in the SciChallenge European project, which aims at increasing the interest of pre-university students in STEM disciplines, through its distinguishing feature, the systematic use of social media for providing and evaluation of the student-generated content. A social media-aware contest and platform were thus developed and tested in a pan-European contest that attracted >700 participants. The statistical analysis and results revealed that the platform and contest positively influenced participants STEM learning and motivation, while only the gender factor for the younger study group appeared to affect the outcomes (confidence level – p<.05).

  • 6.
    Aflaki, Kamyar
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Penetration And Security Testing As A Mean To Securing Universal Web Applications2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The domain of Information Technology has been discussed focusing the security of in-formation based on web application. The main purpose of the paper is to pinpoint andexplain the main attacks on web applications. In the study the I have used real world webapplication to demonstrate different types of attacks and the ways of prevention againstthem. Cyber criminals are using certain tactics to gather sensitive information throughweb applications, thus it is important to study this domain of IT. Experiment has beenconducted to demonstrate the concept and achieved outcomes have been explained. It hasbeen concluded that the most of the web application vulnerabilities come from a bad de-sign, according to Microsoft Developer Network (MSDN) Design Guidelines for SecureWeb Applications, and most of the threats can be prevented by considering basics of webapplication security while designing the application.

  • 7.
    Ahmad, Aftab
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Performance of MLSE over Fading Channels2013Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    This work examines the performance of a wireless transceiver system. The environment is indoor channelsimulated by Rayleigh and Rician fading channels. The modulation scheme implemented is GMSK inthe transmitter. In the receiver the Viterbi MLSE is implemented to cancel noise and interference dueto the ltering and the channel. The BER against the SNR is analyzed in this thesis. The waterfallcurves are compared for two data rates of 1 M bps and 2 Mbps over both the Rayleigh and Rician fadingchannels.

  • 8.
    Ahmad, Muhammad
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Jhanzeb, Jhanzeb
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Modeling and Simulation of an Electrostatic Precipitator Including a Comsol Multiphysics Guide for Modeling an ESP2011Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Gaseous exhaust of different industries contains dust particles of different chemical precipitates that are harmful for the environment. Electrostatic Precipitators are very often used in industries to filter their gaseous exhaust and to prevent the atmosphere to being polluted. Electrostatic Precipitators are very efficient in their work. Electrostatic Precipitators use the force of the electric field to separate the dust particles from gaseous exhaust. Electrostatic Precipitators charge the dust particles and remove these particles by attracting these charged dust particles toward the collecting plates. The charging of dust particles requires a charging zone. When gas passes through that charging zone, the dust particles in the gas stream become charged and then these charged particles are attracted toward the collecting plates. The design of an Electrostatic Precipitators requires the knowledge of its working principle and the problems that often arise during its working. This thesis is the study of the working and the problems of the Electrostatic Precipitators. The main reason for problems in working of an Electrostatic Precipitator is the dust resistivity. This dust resistivity affects the collection performance of an Electrostatic Precipitator. This thesis also contains the simulation of an Electrostatic Precipitator. In the simulation part, the Electric Potential and the Electric Field of an ESP is modeled in an ideal condition, when no gas is flowing through the ESP. The industrial software Comsol Multiphysics is used for the simulation. A Comsol Multiphysics guide is given in appendix of this thesis report that provides information about using this software.

     

  • 9.
    Ahmad, Tanvir
    et al.
    Linnaeus University, Faculty of Engineering and Technology, Department of Computer Science.
    Haider, Muhammad Ashfaq
    Linnaeus University, Faculty of Engineering and Technology, Department of Computer Science.
    A Systematic Literature Review on Claims and supporting Evidence for Self-Adaptive Systems2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
  • 10.
    Aissani, D.
    et al.
    University of Bejaia, Algeria.
    Flammini, Francesco
    University of Maryland University College (UMUC) Europe, Germany.
    Editorial2017In: International Journal of Critical Computer-Based Systems, ISSN 1757-8779, E-ISSN 1757-8787, Vol. 7, no 1, p. 1-3Article in journal (Refereed)
  • 11.
    Akeab, Imad
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Accurate techniques for 2D electromagnetic scattering2014Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis consists of three parts. The first part is an introduction and referencessome recent work on 2D electromagnetic scattering problems at high frequencies. It alsopresents the basic integral equation types for impenetrable objects. A brief discussionof the standard elements of the method of moments is followed by summaries of thepapers.Paper I presents an accurate implementation of the method of moments for a perfectlyconducting cylinder. A scaling for the rapid variation of the solution improves accuracy.At high frequencies, the method of moments leads to a large dense system of equations.Sparsity in this system is obtained by modifying the integration path in the integralequation. The modified path reduces the accuracy in the deep shadow.In paper II, a hybrid method is used to handle the standing waves that are prominentin the shadow for the TE case. The shadow region is treated separately, in a hybridscheme based on a priori knowledge about the solution. An accurate method to combinesolutions in this hybrid scheme is presented.

  • 12.
    Akeab, Imad
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    High frequency scattering and spectral methods2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis consists of five parts. The first part is an introduction with references to some recent work on 2D electromagnetic scattering problems at high frequencies. It also presents the basic integral equation types for impenetrable objects and the standard elements of the method of moments. An overview of frequency modulated radar at low frequencies is followed by summaries of the papers.

     

    Paper I presents an accurate implementation of the method of moments for a perfectly conducting cylinder. A scaling for the rapid variation of the solution improves accuracy. At high frequencies, the method of moments leads to a large dense system of equations. Sparsity in this system is obtained by the modification of the path in the integral equation. The modified path reduces the accuracy in the deep shadow.

     

    In paper II, a hybrid method is used to handle the standing waves that are prominent in the shadow for the cylindrical TE case. The shadow region is treated separately, in a hybrid scheme based on a priori knowledge about the solution. An accurate method to combine solutions in this hybrid scheme is presented.

     

    In paper III, the surface current in the shadow zone of a convex or a concave scatterer is approximated by extracting the dominant waves. An accurate technique based on the symmetric discrete Fourier transform is used to extract the complex wavenumbers and amplitudes for those waves. The dominant waves constitute a concise form of scaling that is used to improve the performance of the method of moments. The effect of surface curvature on the dominant waves has been investigated in this work.

     

    In paper IV, frequency modulated continuous wave radar (FMCW) at low frequency is studied as a way to locate targets that are normally not detected by conventional radar. Three separate platforms with isotropic antennas are used for this purpose. The trilateration method is a way to locate the targets accurately by means of spectral techniques.

     

    The problem of ghost targets has been studied for monostatic and multistatic radar. In the case of confluent echoes in the spectra, potentially missing echoes are reinserted in order to locate all targets. The Capon method is used to obtain high resolution spectra and thus reduce the confluence problem. The need for bandwidth is also reduced.

  • 13.
    Akhtar, Asim
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Alahi, Hassan Mateen
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Sehnan, Moeed
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Simulation of Phased Arrays with Rectangular Microstrip Patches on Photonic Crystal Substrates2012Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    This thesis describes the investigation of photonic crystals as a substrate in microstrip phased array antennas. Alumina with a relative dielectric constant of 9.6 is used as substrate to obtain miniaturization of the components in the high-frequency range. The proposed design consists of four rectangular patches in a linear array conguration operating at 12 GHz. The antenna elements are excited by a microstrip feed line using the inset feeding technique for perfect impedance matching. A beam steering of 20o is achieved using a switched line phase shifter. Antenna parameters, including impedance matching, bandwidth, gain, directivity and the S parameters of the proposed array antenna are obtained. The simulation results are obtained with the Advanced Design System (ADS) simulator.

  • 14.
    Akkasli, Cem
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Methods for Path loss Prediction2009Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    Large scale path loss modeling plays a fundamental role in designing both fixed and mobile radio systems. Predicting the radio coverage area of a system is not done in a standard manner. Wireless systems are expensive systems. Therefore, before setting up a system one has to choose a proper method depending on the channel environment, frequency band and the desired radio coverage range. Path loss prediction plays a crucial role in link budget analysis and in the cell coverage prediction of mobile radio systems. Especially in urban areas, increasing numbers of subscribers brings forth the need for more base stations and channels. To obtain high efficiency from the frequency reuse concept in modern cellular systems one has to eliminate the interference at the cell boundaries. Determining the cell size properly is done by using an accurate path loss prediction method. Starting from the radio propagation phenomena and basic path loss models this thesis aims at describing various accurate path loss prediction methods used both in rural and urban environments. The Walfisch-Bertoni and Hata models, which are both used for UHF propagation in urban areas, were chosen for a detailed comparison. The comparison shows that the Walfisch-Bertoni model, which involves more parameters, agrees with the Hata model for the overall path loss.

  • 15. Aksimsek, Sinan
    et al.
    Cinar, Gökhan
    Nilsson, Börje
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Nordebo, Sven
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    TEM wave scattering by a step discontinuity on the outer wall of a coaxial waveguide2013In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 61, no 8, p. 2783-2791Article in journal (Refereed)
    Abstract [en]

    In this paper, the propagation of TEM waves along a coaxial waveguide with a step discontinuity on its outer wall is investigated rigorously by applying the direct Fourier transform and reducing the problem into the solution of a modified Wiener–Hopf equation. The solution for the field terms are determined in terms of an infinite number of unknown coefficients, which satisfy an infinite set of linear algebraic equations. These equations are solved numerically and the effect of area ratio is presented graphically at the end of the analysis. The same problem is also analyzed by applying the mode-matching technique and the results of the two approaches are compared. It is observed numerically that the Wiener–Hopf technique provides a better convergence than the mode-matching technique.

  • 16.
    Alam, Md. Ariful
    Linnaeus University, Faculty of Engineering and Technology, Department of Physics and Electrical Engineering.
    Mobile Network Planning and KPI Improvement2013Independent thesis Advanced level (degree of Master (One Year)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    In this project, coverage planning in GSM networks as well as capacity and frequency planning has been studied. Various signal interruptions and the necessary steps to remove those interruptions in order to maintain signal quality in mobile communication have been studied. Precautions that should be taken for reducing the effects of interruptions have also been discussed. A drive test has been performed as a part of the improvement process. Guidelines for key performance indicators (KPI) pave the way for radio network quality, coverage and the smooth functioning of the GSM system.

  • 17.
    Aldrin, Martin
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Implementering av ett inbyggt system för automatisk styrning av en robotbil.2007Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis describes a project for the bachelor degree in electrical engineering at Växjö University. The purpose with this project is to construct a guidance system for a robot car, a program that prevents the car from colliding with objects when moving without external control. The robot could also be controlled from the computer through a virtual instrument implemented in Labview. The necessary hardware for steering and communicating has been constructed. The software is implemented using three different programming languages, C, Perl and Labview.

  • 18.
    Aleksakhin, Vladyslav
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Visualization of gene ontology and cluster analysis results2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The purpose of the thesis is to develop a new visualization method for Gene Ontologiesand hierarchical clustering. These are both important tools in biology andmedicine to study high-throughput data such as transcriptomics and metabolomicsdata. Enrichment of ontology terms in the data is used to identify statistically overrepresentedontology terms, that give insight into relevant biological processes orfunctional modules. Hierarchical clustering is a standard method to analyze andvisualize data to nd relatively homogeneous clusters of experimental data points.Both methods support the analysis of the same data set, but are usually consideredindependently. However, often a combined view such as: visualizing a large data setin the context of an ontology under consideration of a clustering of the data.The result of the current work is a user-friendly program that combines twodi erent views for analysing Gene Ontology and Cluster simultaneously. To makeexplorations of such a big data possible we developed new visualization approach.

  • 19.
    Alhasan, Raghda
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Software defined radio2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Software Defined Radio (SDR) technology is used to receive and transmit radio signals. Radio signals can be received using the SDR_sharp software that can be downloaded to a personal computer and combined with the RTL-SDR dongle hardware that is connected to the computer. This report gives a brief explanation of the SDR receiver, the supported software, and some applications that can be implemented with SDR. Moreover, it is shown how to install the SDR_sharp software and the hardware Zadig. After installation, wideband FM (WFM) reception and adjustment of RF gain and frequency error is illustrated. The reception of some national, regional and community/commercial stations that can be received in Växjö Sweden is presented.

    Keyword: Software defined radio, FM radio.

  • 20.
    Alissandrakis, Aris
    et al.
    Dept. of Comput. Intell. & Syst. Sci., Tokyo Inst. of Technol., Tokyo, Japan.
    Otero, Nuno
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Saunders, Joe
    Adaptive Systems Research Group, University of Hertfordshire, Hatfield, UK.
    Dautenhahn, Kerstin
    Adaptive Systems Research Group, University of Hertfordshire, Hatfield, UK.
    Nehaniv, Chrystopher
    Adaptive Systems Research Group, University of Hertfordshire, Hatfield, UK.
    Helping Robots Imitate: Metrics And Computational Solutions Inspired By Human-Robot Interaction Studies2010In: Advances in Cognitive Systems / [ed] Samia Nefti-Meziani and John Gray, Institution of Engineering and Technology, 2010, p. 127-167Chapter in book (Refereed)
    Abstract [en]

    In this chapter we describe three lines of research related to the issue of helping robots imitate people. These studies are based on observed human be- haviour, technical metrics and implemented technical solutions. The three lines of research are: (a) a number of user studies that show how humans naturally tend to demonstrate a task for a robot to learn, (b) a formal approach to tackle the problem of what a robot should imitate, and (c) a technology-driven conceptual framework and technique, inspired by social learning theories, that addresses how a robot can be taught. In this merging exercise we will try to propose a way through this prob- lem space, towards the design of a Human-Robot Interaction (HRI) system able to be taught by humans via demonstration.

  • 21.
    Alm, Anton
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Björling, Joakim
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Prestandautvärdering av firmwares baserade på öppen källkod för routrar/brandväggar på MIPS-arkitektur: Jämförelse mellan Open-WRT, DD-WRT och Tomato firmware2014Independent thesis Basic level (university diploma), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    This investigation compares the performance of three different open-source firmwares. DD-WRT, Open-WRT and Tomato Firmware with MIPS architecture. The test follows two RFC that describes the process of how to perform a performance analysis of network interconnected devices.

    The summarized results show a winner which has generally performed better throughout all the tests and this was Tomato firmware. These results are gathered from three different tests, which is throughput, latency and concurrent sessions test.

    The survey also shows that the performance in general is very equal across all firmwares in the various tests. An important aspect is that there are no outstanding winner, which depends on for example how consistent the results have been. This also concerns a possible conclusion where the firmwares perform various well depending on the type of task involved.

    As further work on this investigation we recommend a performance and function analysis of the tools that the firmware contains. Although a survey of the interface for each firmware would be interesting.

  • 22.
    Al-Masaraa, Zakaria
    et al.
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Rahimi, Majid
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Energikartläggning hos Holtab AB2015Independent thesis Basic level (university diploma), 180 HE creditsStudent thesis
    Abstract [sv]

    En energikartläggning är en granskning av företagets energianvändning i förhållande till företagets behov. Syftet med energikartläggningen är att visa hur elenergin används.

    Syftet med detta examensarbete är att kartlägga och genomföra energimätningar på anläggningarna som finns på Holtab AB.

    I detta examensarbete genomförs en inledande kartläggning som skall fånga åtminstone fyra största enhetsprocesserna per byggnad samt mäta dessa med hjälp av två amperemätare med logger, Fluke 345 och två kanals Chauvin Arnoux ML912.

    De största enhetsprocesserna som kunde fångas var ventilation, tryckluft, elvärme och belysning.

    I slutet av kartläggningen och mätningarna som genomfördes hos företaget blev den totala energianvändningen på ca 820 MWh per år för de största enhetsprocesserna vilket är över 85 % av den totala förväntade elenergianvändningen.

  • 23.
    Al-Najjar, Hamid
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Gustafsson, David
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Uppträdande problem i elkraftsammanhang: Orsak, verkan och åtgjärder2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 24.
    Al-qaissi, Mayss
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    A Study Of Multipath Wave Propagation Using Nero2d and FFT2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    In this report, the Fast Fourier Transform is described briefly. An implementation, inthe form of the Fortran code four1, is tested to verify the accuracy. A two-ray modelfor wave propagation above a flat earth is discussed. The case with AM modulation isimplemented in a Mathematica script. Calculations of the surface current density, withthe program NERO, are made to test the accuracy. The transient scattering from a PECcylinder is studied by means of the code run_nero that runs NERO repeatedly. From aspectrum calculated in this way, the impulse response is obtained by Fourier inversion.

  • 25.
    Altergren, Andreé
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Förberedelse till modernisering av styrsystem för produktion av processvatten2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The heat and power station Allöverket in Kristianstad produced the process water in a plant called the total desalination. In this plant which consists out of two identical lines, they let the incoming water passing through ion exchangers to replace the undesired ions in the water to more desired ions. The reason for doing this is that the undesired ions in the water give coatings on the turbine. When the ion exchangers have been saturated, they must be restored to the original condition. This is done by starting a regeneration program, which consists of a number of steps such as back flushing, intake of chemicals and four different flushes. There are limits on the conductivity and the content of silicon in the water that will be delivered. But there is only measurement of the conductivity connected to the control system, and because of this they control the plant with different timers. To the control system there is connected a number of centrifugal pumps, solenoid valves and instrumentation for measurement of conductivity. In the total desalination sits a Siemens S5 control system that controls the plant after amount of water, conductivity and different times of the sequences. The control functions are now located on a control cabinet out of the factory. The Siemens S5 control system is old and outdated and will be changed to an ABB 800xA control system. This control system they already use to control other parts of the factory from the control room. With this study I have developed a new functional description of the plant and it consists of function diagrams which describes how the software controls the plant today. To the function description, I have also made a new technical description and revised the process scheme so that all documentation of the plant says the same thing.

  • 26.
    Al-Yakoubi, Murad
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Roham, Elias
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Underhåll och övervakning av distributionstransformatorer2012Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Följande projekt går i korthet ut på att avgöra om användning av kylsystemet i en transformatorstation är relevant, om det minimerar temperaturhöjningen orsakad av effektförlusterna som transformatorn avger. Arbetet ska resultera i förslag på val av transformatorer samt beskriva dess egenskaper. Vidare vill vi finna lösningar kring problemet med överhettning i transformatorstationerna och att de generella kraven såsom låg ljudnivå och tillräcklig ventilation (för att ta bort den värmeförlust som de inre komponenterna avger) skall uppfyllas.  För att kunna ge olika förslag på val av transformator i transformatorstationerna har vi på Holtab AB utfört olika beräkningar som visar skillnad för pris, kvalitet, livslängd och egenskaper (effektförluster, energiförluster).

  • 27.
    Amatya, Suyesh
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Kurti, Arianit
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Cross-Platform Mobile Development: Challenges and Opportunities2013In: ICT Innovations 2013: ICT Innovations and Education / [ed] Vladimir Trajkovik and Misev Anastas, Springer, 2013, 1, p. 219-229Chapter in book (Refereed)
    Abstract [en]

    Mobile devices and mobile computing have made tremendous advances and become ubiquitous in the last few years. As a result, the landscape has become seriously fragmented which brings lots of challenges for the mobile development process. Whilst native approach of mobile development still is the predominant way to develop for a particular mobile platform, recently there is shifting towards cross-platform mobile development as well. In this paper, we have performed a survey of the literature to see the trends in cross-platform mobile development over the last few years. With the result of the survey, we argue that the web-based approach and in particular,hybrid approach, of mobile development serves the best for cross-platform development. The results of this work indicate that even though cross platform tools are not fully matured they show great potential. Thus we consider that cross-platform development offers great opportunities for rapid development of high-fidelity prototypes of the mobile application.

  • 28.
    Ambrosius, Robin
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    Machine Learning Based Optimizations for Bot Aided Interviews: In the Field of Due Diligence2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Startups need investments in order to scale their business. The value of such startups, especially software-based startups, are difficult to evaluate because there is no physical value that can be judged.  The company DueDive built experience in due diligence by conducting many interviews in this area, which are the base for the due diligence. These interviews are time consuming and require a lot of domain knowledge in the field, which makes them very expensive. This thesis evaluated different machine learning algorithms to integrate into a software that supports such interviews process. The goal is to shorten the interview duration and lowering the required know know for the interviewer using suggestions by the AI. The software uses completed interview sessions to provide enhanced suggestions through artificial intelligence. The proposed solution uses basket analysis and imputation to analyze the collected data. The result is a topic-independent software that is used to administrate and carry out interviews with the help of AI. The results are validated and evaluated in a case study using a generic, self-defined interview.

  • 29.
    Andersson, Anders
    et al.
    Jönköping University.
    Nilsson, Börje
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Biro, Thomas
    Jönköping University.
    Fourier Methods for harmonic scalar waves in general waveguides2016In: Journal of Engineering Mathematics, ISSN 0022-0833, E-ISSN 1573-2703, Vol. 98, no 1, p. 21-38Article in journal (Refereed)
    Abstract [en]

    A set of semi-analytic techniques based on Fourier analysis is used to solve wave-scattering problems in variously shaped waveguides with varying normal admittance boundary conditions. Key components are the newly developed conformal mapping methods, wave splitting, Fourier series expansions in eigenfunctions to non-normal operators, the building block method or the cascade technique, Dirichlet-to-Neumann operators, and reformulation in terms of stable differential equations for reflection and transmission matrices. For an example, the results show good correspondence with a finite element method solution to the same problem in the low- and medium-frequency domains. The Fourier method complements finite element analysis as a waveguide simulation tool. For inverse engineering involving tuning of straight waveguide parts joining complicated waveguide elements, the Fourier method is an attractive alternative including time aspects. The prime motivation for the Fourier method is its added physical understanding primarily at low frequencies.

  • 30.
    Andersson, Jesper
    et al.
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Caporuscio, Mauro
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Aligning Architectures for Sustainability2016In: ACM Proccedings of the 10th European Conference on Software Architecture Workshops (ECSA-W) / [ed] Rami Bahsoon and Rainer Weinreich, ACM Press, 2016, article id 13Conference paper (Refereed)
    Abstract [en]

    The digitization of industry has drastically changed the competitive landscape by requiring a higher degree of specialization and shorter time to delivery that affect the design properties a software platform should satisfy. The platform architecture must sustain continuous and rapid change to the organizational architecture, which in turn is affected by external forces: i.e., forces drive the velocity of change. In this paper, we explore the effects of digitization, characterizing internal and external forces that impact on business strategies and trigger the continuous realignment of the platform, and outline a research agenda to mitigate the effects.

  • 31.
    Andersson, Magnus
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Elektronikingenjörens vardag: - ett rymdäventyr2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Masteruppsatsen Elektronikingenjörens vardag - ett rymdäventyr är skriven inom programmet yrkeskunnande och professionsutveckling vid Linnéuniversitetet. Uppsatsen beskriver ett yrkeskunnande som både innehåller avancerade datorsimuleringar och handfasta lödningar av elektriska komponenter, där teori och praktik samverkar. Uppsatsen är skriven i essäform, där händelser och situationer i yrkeslivet utforskas.

    Uppsatsen är skriven för att belysa yrkeskunnandet hos en elektronikingenjör från olika synvinklar; arbetslivet, lärandet och moralen. Genom att behandla tre olika sidor av yrket är tanken att få en större insikt om yrkets helhet. 

  • 32.
    Andersson, Robert
    et al.
    University of Kalmar, Kalmar Maritime Academy.
    Huss, Karl
    University of Kalmar, Kalmar Maritime Academy.
    Lagerberg, Henrik
    University of Kalmar, Kalmar Maritime Academy.
    PLC-Baserat Maskinlarm ombord Ms Calmare Nyckel2009Independent thesis Basic level (professional degree), 5 credits / 7,5 HE creditsStudent thesis
    Abstract [en]

    This graduate report describes the work relating to the development of a brand new monitoring and machinery alarm system onboard the training vessel M/S Calmare Nyckel. The system developed, is based on PLC automation technology, and allows graphical presentation of system data.

    The project was managed by three marine engineering students at the Kalmar Maritime Academy.

  • 33.
    Andersson, Sam
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    Induktionsladdning av hybriddrivna fartyg: En framtida lösning för kustfartyg2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Projektet syftar till att bredda kunskapen om induktionsladdning och belysa de för- och nackdelar tekniken bär med sig på utrustning och kringliggande system.

    Med nya strikta krav på sänkta CO2 utsläpp väljer många redare att konvertera dieseldrivna färjor till hybrid eller helbatteridrift. För att tidseffektivisera hamnuppehållen krävs nya innovativa metoder för energiöverföring. Induktionsladdning av fartyg har provats på det norska fartyget MS Folgefonn med lyckat resultat.

    Utmaningarna med att upprätta en fungerande laddstation med sändenhet och mottagarenhet på ett fartyg, som på grund av väderförhållanden inte hålls helt stagnerad, har varit komplicerade.

    Belastningen på det lokala elnätet har också försvårat processen med en energiöverföring i den magnituden, på så mycket som 1 MW effekt.

  • 34.
    Andras, Balla
    Linnaeus University, Faculty of Technology, Department of computer science and media technology (CM).
    A comparison between serverless and Docker container deployments: In the cloud2018Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [en]

    Designing an application from top to bottom is a challenge for any software architect. Designing an application to be deployed in the cloud adds extra complexity and a variety of questions to the task. One of these questions is how to deploy an application? The most popular choices at this time are either Docker containers or serverless functions. This report presents a comparison between the two deployment methods based on cost and performance. The comparison did not yield a conclusive winner but it did offer some key pointers to help with the decision. Docker containers offer a standardized deployment method for a low price and with good performance. Before choosing Docker the intended market needs to be evaluated given that for each region Docker needs to serve, the price also increases. Serverless functions offer auto-scaling and easy global deployments but suffer from high complexity, slower performance, and an uncertain monthly price tag.

  • 35.
    Annerbrink, Totte
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Talovic, Nizar
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Den avskalade effekten: Om effekten av ett minimalistiskt skrivverktyg och hur det upplevs i en interaktiv användningssituation2017Student paper second term, 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis and report has addressed and focused on identifying the interaction effect that occurs when an information system's interface is scaled off and is minimalistic. This case study is based on a web-based writing tool called Writer. The purpose of the research has been to clarify the personal interaction effect in an interactive usage situation and how it in turn affects the user experience. The theoretical field and framework of the study is Actability , focusing on the interactive action level in connection with The Elementary InterAction Loop . The Elementary InterAction Loop consists of four steps where the user asks, does, gets an answer and then evaluates. In conjunction with the theory, five interaction criteria have been incorporated, which are; Clear Action Repertoire , Intelligible Vocabulary , Action Transparency , Clear Feedback , and Amendability . These five criteria have been the thematization of the empirical work.

    Through both targeted selection and snowball sampling, six journalists/writers have been involved in collecting data. In the method work, user test was performed on the writing tool with tasks formulated in accordance to the five interaction criteria. In the method work, user tests was performed on the writing tool. Thereafter the tasks was formed according to the five interaction criteria from the theoretical framework. All informants evaluated their experience and made thirteen statements based on a user experience questionnaire where concepts such as easy to learn/not easy to learn and effective/ineffective were asked for. Following these two steps in the empirical study, semi-structured interviews were conducted with fifteen questions based on the five interaction qualities. In order to analyze the collected data, the content analysis method was applied which resulted in 25 categories with descriptions and quotes. Based on a content analysis and its results, the categories were then analyzed using the D.EU.PS model and its 18 classes. The analysis resulted in ten interaction effects placed in seven different classes. The result and the ten interaction effects are: Security, Previous references, Terminology, Recognition, Understanding of sequence/action, Perception, Simplicity, Efficiency Availability and Grouping (proximity). Based on personal behavior as a perspective, these effects are the result of a minimalistic writing tool that contributes to a good user experience.

  • 36.
    Anton, Mösenbacher
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Develop Mobile Hybrid Application with Ionic and Angular.js: Suitable for further development?2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report presents a proof-of-concept regarding hybrid mobile application development and mobile phones. Regarding the background of a desire to simplify and modernize of how hot work is carried out in in industry. A conclusion on future developments regarding a hybrid or native options will also be deducted. Keywords: native, hybrid, mobile application, future development, Agile, Scrum.

  • 37.
    Arnell, Marcus
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Undersökning om möjligheten till småskalig vattenkraft i Björkefalls kvarn2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    At present when the interest of environmentally friendly energy increases, small scaled water power is seen as an option to decrease Sweden's import of energy. In Sweden there are thousands of abandoned mills and small water power stations, these could with small means be restored and start to deliver energy again. In Björkefall, Olofströms municipality, there is a individually owned and abandoned mill. This rapport explores the possibilities for a small scale water power station there, for Olofströms Kraft AB.

    Small scaled, water power, power electronics, generator, turbine

  • 38.
    Aster, Maximilian
    Linnaeus University, Faculty of Technology, Department of Computer Science.
    Repackaging Web Pages2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Current trends in the market of Web-enabled devices are moving the focus from desktop web pages to pages optimised for a set of other devices like smartphones or tablets. Within this thesis an approach is introduced, able to adapt and automatically transform web pages and even the web applications logic flow into a new kind of representation, specifically for a certain target group. Therefore a general process is defined to describe the various phases that have to be gone through to transform or repackage a website. It serves as the basis for the solution, which was built as part of this thesis, and incorporates state of the art concepts and methods from various fields of Web Science. The implemented artefacts demonstrate how an appropriate architecture looks like and what additional possibilities open up.

  • 39.
    Augustsson, Jesper
    et al.
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Salomonsson, Peter
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Gamification - Samspelet mellan människor och IT: Undersökning av spelmekanismers motivationshöjande effekter2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This bachelor thesis is a study to investigate the game mechanics in a selected training application. The study aims to create a greater understanding of why people get motivational effects with the help of information technology. This will be done by examining the users of the example Nike + to find out what features they consider giving them a motivating effect and thus describe the game mechanics these include.

     

    The study uses a qualitative approach to carryout interviews with the users of our example Nike+. The interview questions are based in theory of the field Gamification and previous research on the topic.

     

    The result shows that there are several different game mechanics implemented in Nike +, which has a positive impact on users. The result strengthens the game mechanics informants set positively towards making running a fun form of exercise as well as increased training frequency of our informants.

  • 40.
    Augustsson, Joacim
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Larsson, Gustaf
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Styrning av stegmotor för robot med NICompactRIO2009Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report deals about controlling and regulating stepping motors and PM-motors by using thegraphical programming language NI Labview, with hardware NI CompactRIO and NI DAQ-USB.The implementation has been done by controlling a robot with a for the task built system, controllinga PM-motor by PWM and a own created controller.

  • 41.
    Avdic, Armin
    et al.
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Larsson, Daniel
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Korrigering av sågplacering: En flervariabel tidsdiskret reglering av sågplacering i ett sågverk2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Det här arbetet handlar om sågreglering i syfte att förbättra precisionen i sågningen. I dagens sågverk är utrustningen modern men sättet att bestämma korrigeringsvärden för bandsågar är omodernt. Arbetet innehåller analys, programmering samt kalkylering. En del i arbetet består av att finna störningar i sågprocessen och eliminera störningarna med hjälp av sågkorrigering. Mätningen sker med en noggrannheten på en tiondels millimeter. En algoritm som korrigerar sågarna för bästa möjliga resultat har implementerats i PLC och Excel. Denna algoritm ger ett snabbt svar för korrigeringsvärdet.

  • 42.
    Axelsson, Johannes
    Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
    WAN-optimering för sjöfarten: En möjlighet att effektivisera datakommunikationen till sjöss2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Shipboard operations have become more reliant of data communication and many of the duties on board may be facilitated if the crew can access information stored elsewhere. The broadband connection between ship and shore is mostly done via satellite communication where long distances and limited data rate results in inefficient data communication. This study examines network optimization and the performance improvement this can have regarding slow WAN connections via satellite. The survey showed that the biggest issue with data communication via satellite is the signal delay caused by the long transmission distance which means that there will be performance degradation for data traffic and users will experience the data communication as slow. To solve this there is equipment that enhances the performance of the connection and handles the data communication by implementing various techniques. To investigate how much the performance improvement can be this study carried out a number of experiments with network optimization equipment.  The experiments evaluated file transfer with and without network optimization. The results show that the network optimization gives a major performance improvement regarding file transfer.

  • 43.
    Azurdia Meza, Cesar Augusto
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Jon Mohamadi, Yaqub
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Implementation of the LMS Algorithm for Noise Cancellation on Speech Using the ARM LPC2378 Processor.2009Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    On this thesis project, the LMS algorithm has been applied for speech noise filteringand different behaviors were tested under different circumstances by using Matlabsimulations and the LPC2378 ARM Processor, which does the task of filtering in realtime. The thesis project is divided into two parts: the theoretical and practical part.

    In the theoretical part there is a brief description of the different aspects of signalprocessing systems, filter theory, and a general description of the Least-Mean-SquareAdaptive Filter Algorithm.

    In the practical part of the report a general description of the procedure will besummarized, the results of the tests that were conducted will be analyzed, a generaldiscussion of the problems that were encounter during the simulations will be mention,and suggestion for the problems will be given.

  • 44.
    Baglee, David
    et al.
    University of Sunderland, UK.
    Gorostegui, Unai
    Mondragon University, Spain.
    Jantunen, Erkki
    VTT Technical Research Centre of Finland, Finland.
    Campos, Jaime
    Linnaeus University, Faculty of Technology, Department of Informatics.
    Sharma, Pankaj
    Indian Institute of Technology Delhi, India.
    Optimizing Condition Monitoring of Big Data Systems2017In: Proceedings of the 2017 International Conference on Data Mining: DMIN'17 / [ed] Robert Stahlbock, Mahmoud Abou-Nasr, Gary M. Weiss, CSREA Press, 2017, p. 127-131Conference paper (Refereed)
    Abstract [en]

    Industrial communication networks are common in a number of manufacturing organisations. The high availability of these networks is crucial for smooth plant operations. Therefore local and remote diagnostics of these networks is of primary importance in determining issues relating to plant reliability and availability. Condition Monitoring (CM) techniques when connected to a network provide a diagnostic system for remote monitoring of manufacturing equipment. The system monitors the health of the network and the equipment and is therefore able to predict performance. However, this leads to the collection, storage and analyses of large amounts of data, which must provide value. These large data sets are commonly referred to as Big Data. This paper presents a general concept of the use of condition monitoring and big data systems to show how they complement each other to provide valuable data to enhance manufacturing competiveness.

  • 45.
    Baglee, David
    et al.
    University of Sunderland, UK.
    Gorostegui, Unai
    Mondragon University, Spain.
    Jantunen, Erkki
    VTT Technical Research Centre of Finland, Finland.
    Sharma, Pankaj
    Indian Institute of Technology Dehli, India.
    Campos, Jaime
    Linnaeus University, Faculty of Technology, Department of Informatics.
    How can SMEs adopt a new method to advanced maintenance strategies: A Case study approach2017In: 30th International Congress & Exhibition on Condition Monitoring and Diagnostic Engineering Management COMADEM, July 10th-13th 2017, University of Central Lancashire, 2017Conference paper (Refereed)
  • 46.
    Baloian, Nelson
    et al.
    Universidad de Chile.
    Zurita, Gustavo
    Universidad de Chile.
    Frez, Jonathan
    Universidad Diego Portales.
    Milrad, Marcelo
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Supporting Engineering Students Learning Wireless Network Planning Using Mobile, Positioning and Web Technologies2012In: Proceedings of the 12th IEEE International Conference on Advanced Learning Technologies, ICALT 2012, IEEE Press, 2012, p. 509-514Conference paper (Refereed)
    Abstract [en]

    Teaching and learning the principles of wireless communication is a challenging issue mainly because it is difficult for students to translate the theoretical models that are commonly used in this area into practical knowledge. In order to address this challenge, we explore how to design and implement novel teaching and learning activities that integrate the principles of situated learning supported by mobile, positioning and web technologies. In this paper we present the results of our on-going efforts in this direction describing the rationale of our approach, an application supporting a learning activity designed under this approach and the outcomes of an evaluation we conducted with 28 engineering students. Obtained results show that the proposed approach offers the students new possibilities to combine theoretical and practical knowledge in a variety of collaborative situations in which mobile and web technologies played a central role.

  • 47.
    Bart, Marco
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Spectroscopic methods for secure document authentication: An application to the automated handling of sheet-like objects2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    For a long time, document security features, in particular inks and paper fibres, have been composed of materials with specific spectral characteristics. Consequently, spectral cues are playing an important role in forensic authentication methods. Document sorting machines, on the other hand, are characterized by a transport speed of often more than one meter per second. Furthermore, such systems are constrained with respect to size and cost. As a consequence, generic spectroscopic detection methods have rarely been used in that area. However, with recent technological advances in light-sources and in fast, low-cost spectrometers, generic spectroscopic analysis may become affordable for wider use in a not too distant future.

    The goal of this thesis project is evaluating the suitability of generic spectroscopic methods for the authentication of secure documents. To this end, the hardware and software for a spectroscopic sensor prototype was developed and integrated into an automated document sorting machine. This prototype consists of a grating spectrometer, covering the near UV and visible spectral range, combined with light guides and illumination sources for UV and IR wavelengths.

    Data sets for genuine and counterfeit value documents were captured using this prototype system and its authentication performance was tested based on host-side classification of this data. The algorithms employed for feature authentication rely on model-based vector correlation and the extraction of average intensity values from pre-defined wavelength ranges.

    The test results show that the authentication of value documents with such a system is feasible in principle, but also that there are limitations regarding component costs, the availability of light sources for farther UV wavelengths and the stability of spectral features on value documents in circulation.

    This work was performed in the context of Linnæus University’s Master Programme in Signal Processing and Wave Propagation. The sensor development took place at the research facility of Talaris Limited, Berne Branch in cooperation with the Laboratory for Optics and Photonics, University of Applied Sciences Berne, Switzerland.

  • 48.
    Bartosz, Michalek
    et al.
    Katholieke Universiteit Leuven, Belgium .
    Weyns, Danny
    Katholieke Universiteit Leuven, Belgium .
    Towards a Solution for Change Impact Analysis of Software Product Line Products2011In: VARSA Workshop; Software Architecture (WICSA), 2011 9th Working IEEE/IFIP Conference on, IEEE Communications Society, 2011, p. 290-293Conference paper (Refereed)
    Abstract [en]

    Despite the fact that some practitioners and researchers report successful stories on Software ProductLines (SPL) adaptation, the evolution of SPL remains challenging. In our research we study a specific aspect of SPL adaptation, namely on updating of deployed products. Our particular focus is on the correct execution of updates and minimal interruption of services during the updates. The update process has two stages. First, the products affected by the evolution must be identified. We call this stage SPL-wide change impact analysis. In the second stage, each of the affected products has to be updated. In our previous work we have addressed the second stage of the update process. In this paper we report on our early results of the first stage: change impact analysis. We discuss how existing variability models can be employed to support automated identification of the products that require an update. The discussion is illustrated with the examples from an educational SPL that we are developing at K.U. Leuven.

  • 49.
    Bashir, Imran
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Visualizing Complex Data Using Timeline2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis  introduces the idea of visualizing complex data using timeline for problem solving and analyzing a huge database. The database contains information about vehicles, which are continuously sending information about driving behavior, current location, driver ativities etc. Data complexity can be resolved by data visualization where user can see this complex data in the abstract form of timeline visualization. visualize complex data by using timeline mgiht help to monitor and track diffrent time dependent activities. We developed web application to monitor and track monthly, weekly, and daily activities which helps in decision making and understanding complex data.

  • 50.
    Bassoo, Vandana
    et al.
    Victoria University, Australia.
    Tom, K
    Victoria University, Australia.
    Mustafa, A. K.
    Victoria University, Australia.
    Cijvat, Ellie
    Lunds Universitet.
    Sjöland, Henrik
    Lunds Universitet.
    Faulkner, Mike
    Victoria University, Australia.
    Potential Architecture for Future Generation "Green" Wireless Base Station2009In: 2009 4th International Symposium on Wireless and Pervasive Computing, ISWPC 2009, IEEE, 2009, article id 4800602Conference paper (Refereed)
    Abstract [en]

    Current radio frequency power amplifiers (PAs) in 3G base stations have very high power consumption leading to a hefty cost and negative environmental impact. In this paper, we propose a potential architecture design for future wireless base station. Issues associated with components of the architecture are investigated. A comparison of PA with pulse width modulation drive and PA with envelope elimination and restoration (EER) drive is offered. EER-driven PA promises high efficiency over a wide dynamic range but has bandwidth expansion problems. A novel approach which reduces bandwidth expansion on the envelope by 54% is proposed. A modulator is used to convert amplitude and phase information into the edges of a pulse train. The modulator also eradicates some analog components present in traditional base station design.

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