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  • Stille, Björn
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Att organisera utbildning som en hybrid mellan högskola och skarpa projekt i industrin2013Conference paper (Refereed)
    Abstract [sv]

    På civilingenjörsprogrammet i industriell ekonomi vid Blekinge tekniska högskola har vi under tre års tid drivit en kurs i projektorganisation organiserad som en hybrid mellan skola och skarpa projekt i industrin. Hybridkurser är ett försök att få högskoleutbildning att knyta an till utveckling, design, byggande, utforskning, undersökning och teoriutveckling och inte enbart läsa, skriva, lyssna, prata och lära det som andra redan vet, i dagens värld otillräckliga mål. Syftet är att få studenterna att lära sig både det redan kända och det nya: det som ska utvecklas. Artikeln redogör för undervisningexperimenten med hybridkurser.

  • Stille, Björn
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    20 år av skarpa projekt i högskolan: Lärdomar 1995-20152016In: Lärarlärdom 2016: Högskolan Kristianstad / [ed] Dahlqvist, Claes & Larsson, Stefan, Kristianstad: Kristianstad University Press , 2016, 21-39 p.Conference paper (Refereed)
    Abstract [sv]

    På Blekinge tekniska högskola finns sedan länge en tradition av skarpa studentprojekt. Med det menas projekt med kunder i form av företag och organisationer utanför högskolan. Detta gjordes inom många ämnen, men främst inom utbildningsprogrammen programvaruteknik, människor- datateknik-arbetsliv (MDA) och fysisk planering. Jag har under tjugo år haft förmånen att delta i utbildningar med sådana inslag och den här artikeln är ett försök att sammanfatta erfarenheter av dessa verksamheter samt visa på problem och möjligheter för den högre utbildningen. Dessa projekt har tidigare beskrivits i olika högskolepedagogiska sammanhang. Det jag vill göra i den här rapporten är att utgå från tre någorlunda detaljerade fallbeskrivningar från tre olika utbildningsprogram och med dessa visa på hinder och möjliggörare för att driva skarpa projekt inom högskolans ram från A- till masternivå och för olika slag av utbildningar, allmänna som mer professionsinriktade. Jag vill också illustrera en utveckling från att ha skarpa projekt i vanliga högskolekurser till att vad som närmast kan betraktas som en ny utbildningsform där det blir tydligt att de skarpa projekten med arbetslivets logik och rörelsemönster är annorlunda än vad som gäller för lärande i högskolekurser. Denna utbildningsform kallar jag för hybridkurser, som är en hybrid av högskola med dess ”skollogik” och arbetslivets olika logiker. Att förena dessa logiker i en kurs i nuvarande strikt uppstyrda högskolesystem är komplicerat. Fallbeskrivningarna ger exempel på olika sätt att göra dessa problem tydliga och lyfta fram möjligheter till lösningar. Avslutningsvis leder detta in mig på frågan om vad det är för fel på dagens högskolesystem. Buden är många, både från akademi och näringsliv. Kanske vore en moderniserad polyteknisk utbildning en möjlig vägframåt?

  • Bakhtyar, Shoaib
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Ghazi, Ahmad Nauman
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    On Improving Research Methodology Course at Blekinge Institute of Technology2016Conference paper (Refereed)
    Abstract [en]

    The Research Methodology in Software Engineering and Computer Science (RM) is a compulsory course that must be studied by graduate students at Blekinge Institute of Technology (BTH) prior to undertaking their theses work. The course is focused on teaching research methods and techniques for data collection and analysis in the fields of Computer Science and Software Engineering. It is intended that the course should help students in practically applying appropriate research methods in different courses (in addition to the RM course) including their Master’s theses. However, it is believed that there exist deficiencies in the course due to which the course implementation (learning and assessment activities) as well as the performance of different participants (students, teachers, and evaluators) are affected negatively. In this article our aim is to investigate potential deficiencies in the RM course at BTH in order to provide a concrete evidence on the deficiencies faced by students, evaluators, and teachers in the course. Additionally, we suggest recommendations for resolving the identified deficiencies. Our findings gathered through semi-structured interviews with students, teachers, and evaluators in the course are presented in this article. By identifying a total of twenty-one deficiencies from different perspectives, we found that there exist critical deficiencies at different levels within the course. Furthermore, in order to overcome the identified deficiencies, we suggest seven recommendations that may be implemented at different levels within the course and the study program. Our suggested recommendations, if implemented, will help in resolving deficiencies in the course, which may lead to achieving an improved teaching and learning in the RM course at BTH. 

  • Kusetogullari, Huseyin
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Yavariabdi, Amir
    Karatay University, TUR.
    Change Detection in Multispectral Landsat Images Using Multiobjective Evolutionary Algorithm2017In: IEEE Geoscience and Remote Sensing Letters, ISSN 1545-598X, E-ISSN 1558-0571, Vol. 14, no 3, 414-418 p., 10.1109/LGRS.2016.2645742Article in journal (Refereed)
    Abstract [en]

    In this letter, we propose a novel method for unsupervised change detection in multitemporal multispectral Landsat images using multiobjective evolutionary algorithm (MOEA). The proposed method minimizes two different objective functions using MOEA to provide tradeoff between each other. The objective functions are used for evaluating changed and unchanged regions of the difference image separately. The difference image is obtained by using the structural similarity index measure method, which provides combination of the comparisons of luminance, contrast, and structure between two images. By evolving a population of solutions in the MOEA, a set of Pareto optimal solution is estimated in a single run. To find the best solution, a Markov random field fusion approach is used. Experiments on semisynthetic and real-world data sets show the efficiency and effectiveness of the proposed method.

  • Boldt, Martin
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Borg, Anton
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science and Engineering.
    Evaluating Temporal Analysis Methods UsingResidential Burglary Data2016In: ISPRS International Journal of Geo-Information, Special Issue on Frontiers in Spatial and Spatiotemporal Crime Analytics, ISSN 2220-9964, Vol. 5, no 9, 1-22 p.Article in journal (Refereed)
    Abstract [en]

    Law enforcement agencies, as well as researchers rely on temporal analysis methods in many crime analyses, e.g., spatio-temporal analyses. A number of temporal analysis methods are being used, but a structured comparison in different configurations is yet to be done. This study aims to fill this research gap by comparing the accuracy of five existing, and one novel, temporal analysis methods in approximating offense times for residential burglaries that often lack precise time information. The temporal analysis methods are evaluated in eight different configurations with varying temporal resolution, as well as the amount of data (number of crimes) available during analysis. A dataset of all Swedish residential burglaries reported between 2010 and 2014 is used (N = 103,029). From that dataset, a subset of burglaries with known precise offense times is used for evaluation. The accuracy of the temporal analysis methods in approximating the distribution of burglaries with known precise offense times is investigated. The aoristic and the novel aoristic_ext method perform significantly better than three of the traditional methods. Experiments show that the novel aoristic_ext method was most suitable for estimating crime frequencies in the day-of-the-year temporal resolution when reduced numbers of crimes were available during analysis. In the other configurations investigated, the aoristic method showed the best results. The results also show the potential from temporal analysis methods in approximating the temporal distributions of residential burglaries in situations when limited data are available.

  • Linde, Peter
    Blekinge Institute of Technology, The Library.
    Årsberättelse 2016 Högskolebiblioteket BTH2017Other (Other (popular science, discussion, etc.))
  • Khan, Imran
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    Measurements, Analysis Techniques and Experiments in Sound and Vibration: Applied to Operational MRI Scanners and in Remote Laboratories.2017Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    High quality noise and vibration measurements outside of a laboratory environment on real life structures and applications are not trivial. True boundary and operating conditions enforce unique challenges on the measurements. Measurements in hazardous situations such as high magnetic fields, and high temperature environments, etc., where ordinary measurement equipment and methods may not be employed, require further precautions. Post measurements objectives such as analysis, design and strategic decisions, e.g., control, rely heavily on the quality and integrity of the measurements (data).

    The quality of the experimental data is highly correlated with the on-field expertise. Practical or hands-on experience with measurements can be imparted to prospective students, researchers and technicians in the form of laboratory experiments involving real equipment and practical applications. However, achieving expertise in the field of sound and vibration measurements in general and their active control in particular is a time consuming and expensive process. Consequently most institutions can only afford a single setup, resulting in the compromise of the quality of expertise.

    In this thesis, the challenges in the field of sound and vibration measurements in high magnetic field are addressed. The analysis and measurement of vibration transferred from an operational magnetic resonance imaging (MRI) scanner to adjacent floors is taken as an example. Improvised experimental measurement methods and custom-made frequency analysis techniques are proposed in order to address the challenges and study the vibration transfer. The methods may be extended to other operational industrial machinery and hazardous environments. To encourage and develop expertise in the field of acoustic/vibration measurements and active noise control on practical test beds, remotely controlled laboratory setups are introduced. The developed laboratory setup, which is accessed and controlled via the Internet, is the first of its kind in the active noise control and acoustic measurements area. The laboratory setup can be shared and utilized 24/7 globally, thus reducing the associated costs and eliminating time restrictions.

  • Imran, khan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Applied Signal Processing.
    MRI Scanner’s Vibration Isolation: Experimental Measurements, Analysis Techniques and Analytical Models2017Report (Other academic)
    Abstract [en]

    Modern Magnetic Resonance Imaging (MRI) scanners employ techniques for faster switching of currentsin the gradient coils. The aim is to improve the imaging quality and/or shorter scanning time at thecost of further escalating the associated vibration and noise excited by the Lorentz forces in the gradientcoil. These developments necessitate the employment of effective vibration isolation measures, both priorand post installation, for which a comprehensive analysis of the vibration transfer paths is essential. Such ananalysis is presented in this paper for an operational MRI scanner. The vibration transfer paths are studiedboth analytically and experimentally. Based on the spectral analysis results, improvements in the existingvibration isolation mechanism are discussed.

  • Renato, Machado
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Vu, Viet Thuy
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Pettersson, Mats
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Dammert, Patrik
    Saab Electronic Defense Systems, SWE.
    Hellsten, Hans
    Saab Electronic Defense Systems, SWE.
    The stability of UWB low-frequency SAR images2016In: IEEE Geoscience and Remote Sensing Letters, ISSN 1545-598X, E-ISSN 1558-0571, Vol. 13, no 8, 1114-1118 p.Article in journal (Refereed)
    Abstract [en]

    This letter presents an analysis of prefiltered clutter ultrawideband (UWB) very high frequency synthetic aperture radar (SAR) images. The image data are reorganized into subvectors based on the observation of the image-pair magnitude samples. Based on this approach, we present a statistical description of the SAR clutter obtained by the subtraction between two real SAR images. The statistical analysis based on bivariate distribution data organized into different intervals of magnitude can be an important tool to further understand the properties of the backscattered signal for low-frequency SAR images. In this letter, it is found that, for “good” image pairs, the subtracted image has Gaussian distributed clutter backscattering and that the noise mainly consists of the thermal noise and, therefore, speckle noise does not have to be considered. This is a consequence of the stable backscattering for a UWB low-frequency SAR system.

  • Khan, Imran
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Muhammad, Moazzam
    Rabbani, Muhammad Shoaib
    BTH.
    Johansson, Sven
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Performance evaluation of control algorithms implemented on a remotely controlled active noise control laboratory2013In: Active Noise and Vibration Control in Practical System Implementations, 2013, 731Conference paper (Other academic)
    Abstract [en]

    The remotely controlled laboratory setup for Active Noise Control (ANC) developed by Blekin-ge Institute of Technology, Sweden provides an efficient learning platform for the students to implement and learn ANC algorithms with real world physical system, hardware and signals. The initial laboratory prototype based on a Digital Signal Processor (DSP) TMS320C6713 from Texas Instruments (TI) was successfully tested with Filtered-x Least Mean Square (F-XLMS) algorithm applied to control noise in a ventilation duct. The resources of the DSP platform used in the remote laboratory setup enable testing and investigating substantially more challenging and computationally demanding algorithms. In this paper, we expand the horizon of the laboratory setup by testing more advanced and complicated single channel feed forward ANC algorithms. Filtered-x versions of algorithms such as the normalized least mean square (N-LMS), leaky least mean square (L-LMS), Filtered-U recursive least mean square (FURLMS) and recursive least square (RLS) algorithm etc. have been implemented utilizing the remote web based client provided in the remote laboratory. A comprehensive performance comparison of the aforementioned algorithms for the remote laboratory setup is presented to demonstrate the viability of the remote laboratory.

  • Khan, Imran
    et al.
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Gertsovich, Irina
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Claesson, Ingvar
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Håkansson, Lars
    Blekinge Institute of Technology, School of Engineering, Department of Electrical Engineering.
    Johansson, Per-Erik
    Wirenstedt, Maria
    Borja, Oscar
    Petersson, Stefan
    MRI SCANNER VIBRATION PATH ANALYSIS2013In: Machinery Noise and Vibration, 2013, 725Conference paper (Other academic)
    Abstract [en]

    Magnetic Resonance Imaging (MRI) scanner is one of the most important tools in clinical diagnostics. MRI scanners are associated by strong vibration which results in unpleasant and disturbing acoustic noise. The primary source of this vibration is the Lorentz force produced by fast switching of the currents inside the gradient coils of MRI scanners under a strong static magnetic field. During an MR-imaging scan the switching is controlled in order to spatially code the hydrogen nuclei that will generate the signal, which is reconstructed into anatomical images. Faster switching of the currents allows for shorter scan times and/or higher image resolutions. Consequently, the clinical quality has motivated the drive for shorter switching time and higher currents. This development, however, has also caused an undesired increase of MRI vibrations. The overall vibration phenomenon of an installed fully functional MRI scanner system becomes unique because of the installed location and ambiance. This vibration can potentially degrade the image quality and hence the diagnosis. Apart from the vibration produced, the associated annoying acoustic noise may not only affect the patients under examination and the clinical staff, but may also be transmitted to other parts of the building and causing discomfort for the personnel working there. In order to devise an effective isolation plan or improve an existing one both for vibration and acoustic noise it is important to study the noise and vibration transfer paths. This paper concerns an investigation of vibration transfer paths for vibration excited by an installed functional MRI scanner at a medical facility. The vibration transfer paths have been investigated experimentally. The obtained results are presented and discussed.