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  • 51.
    Garcia-Loro, F.
    et al.
    Spanish University for Distance Education (UNED), ESP.
    Cristobal, E. S.
    Spanish University for Distance Education (UNED), ESP.
    Diaz, G.
    Spanish University for Distance Education (UNED), ESP.
    MacHo, A.
    Spanish University for Distance Education (UNED), ESP.
    Baizan, P.
    Spanish University for Distance Education (UNED), ESP.
    Blazquez, M.
    Spanish University for Distance Education (UNED), ESP.
    Castro, M.
    Spanish University for Distance Education (UNED), ESP.
    Plaza, P.
    Spanish University for Distance Education (UNED), ESP.
    Orduna, P.
    DeustoTech LabsLand, ESP.
    Auer, M.
    International Association of Online Engineering (IAOE), AUT.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nilsson, Kristian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Fidalgo, A.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Alves, G.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Marques, A.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Hernandez-Jayo, U.
    University of Deusto, Bibao, ESP.
    Garcia-Zubia, J.
    University of Deusto, Bibao, ESP.
    Kreiter, C.
    Carinthia University of Applied Sciences (CUAS), AUT.
    Pester, A.
    Carinthia University of Applied Sciences (CUAS), AUT.
    Garcia-Hernandez, C.
    EVM, Tenerife, ESP.
    Tavio, R.
    EVM, Tenerife, ESP.
    Valtonen, K.
    OMNIA, FIN.
    Lehtikangas, E.
    OMNIA, FIN.
    PILAR: A Federation of VISIR Remote Laboratory Systems for Educational Open Activities2019Inngår i: Proceedings of 2018 IEEE International Conference on Teaching, Assessment, and Learning for Engineering, TALE 2018, Institute of Electrical and Electronics Engineers Inc. , 2019, s. 134-141Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Social demands have promoted an educational approach based on an 'anywhere and anytime' premise. Remote laboratories have emerged as the answer to the demands of technical educational areas for adapting themselves to this scenario. The result has not only benefit distance learning students but has provided new learning scenarios both for teachers and students as well as allowing a flexible approach to experimental topics. However, as any other solution for providing practical scenarios (hands-on labs, virtual labs or simulators), remote labs face several constraints inherited from the subsystems of its deployment - hardware (real instruments, equipment and scenario) and software (analog/digital conversions, communications, workbenches, etc.}. This paper describes the Erasmus+ project Platform Integration of Laboratories based on the Architecture of visiR (PILAR) which deals with several units of the federation installed in different educational institutions and devoted to analog electronics and electrical circuits. Based on the limitations of remote labs, the need for the federation will be justified and its benefits will be described by taking advantage of its strengths. The challenges that have come up during the different stages and the different approaches to design are also going to be described and analyzed. © 2018 IEEE.

  • 52.
    Garcia-Loro, Felix
    et al.
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Macho, Alejandro
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Cristobal, Elio San
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Diaz, Gabriel
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Castro, M.
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nilsson, Kristian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Fidalgo, André V.
    Polytechnic of Porto, PRT.
    Alves, Gustavo
    Polytechnic of Porto, PRT.
    Marques, Arcelina
    Polytechnic of Porto, PRT.
    Hernandez-Jayo, Unai
    Universidad de Deusto, ESP.
    Garcia-Zubia, Javier
    Universidad de Deusto, ESP.
    Kreiter, Christian
    Fachhochshule Technikum Karnten, AUT.
    Oros, Ramona Georgiana
    Fachhochshule Technikum Karnten, AUT.
    Pester, A.
    Fachhochshule Technikum Karnten, AUT.
    Garbi-Zutin, Danilo
    International Association of Online Engineering (IAOE), AUT.
    Auer, Michael E.
    International Association of Online Engineering (IAOE), AUT.
    Garcia-Hernandez, Carla
    EVM., Tenerife, ESP.
    Tavio, Ricardo
    EVM., Tenerife, ESP.
    Valtonen, Kati
    OMNIA, Helsinki, FIN.
    Lehtikangas, Elina
    OMNIA, Helsinki, FIN.
    Experimenting in PILAR federation: A common path for the future2018Inngår i: PROCEEDINGS OF 2018 IEEE GLOBAL ENGINEERING EDUCATION CONFERENCE (EDUCON) - EMERGING TRENDS AND CHALLENGES OF ENGINEERING EDUCATION, IEEE Computer Society , 2018, s. 1518-1523Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The PILAR (Platform Integration of Laboratories based on the Architecture of visiR) Erasmus Plus project started in September 2016 and will last three years. The core of the PILAR project is the VISIR remote laboratory-Virtual Instruments System In Reality-. The project aims for a federation of five of the existing VISIR nodes, sharing experiments, capacity and resources among partners, and to provide access to VISIR remote lab, through PILAR consortium, to students from other educational institutions. PILAR will be the framework from which management tasks will be performed and laboratories/experiments will be shared. PILAR will also foster the Special Interest Group of VISIR under the Global Online Laboratory Consortium (GOLC) of the International Association of Online Engineering (IAOE). © 2018 IEEE.

  • 53.
    Garcia-Zubia, Javier
    et al.
    Univ Deusto, ESP.
    Cuadros, Jordi
    Univ Ramon Llull, ESP.
    Romero, Susana
    Univ Deusto, ESP.
    Hernandez-Jayo, Unai
    Univ Deusto, ESP.
    Orduna, Pablo
    Univ Deusto, ESP.
    Guenaga, Mariluz
    Univ Deusto, ESP.
    Gonzalez-Sabate, Lucinio
    Univ Ramon Llull, ESP.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling. Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för elektroteknik. Blekinge Tekniska Högskola, Institutionen för signalbehandling.
    Empirical Analysis of the Use of the VISIR Remote Lab in Teaching Analog Electronics2017Inngår i: IEEE Transactions on Education, ISSN 0018-9359, E-ISSN 1557-9638, Vol. 60, nr 2, s. 149-156Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Remote laboratories give students the opportunity of experimenting in STEM by using the Internet to control and measure an experimental setting. Remote laboratories are increasingly used in the classroom to complement, or substitute for, hands-on laboratories, so it is important to know its learning value. While many authors approach this question through qualitative analyses, this paper reports a replicated quantitative study that evaluates the teaching performance of one of these resources, the virtual instrument systems in reality (VISIR) remote laboratory. VISIR, described here, is the most popular remote laboratory for basic analog electronics. This paper hypothesizes that use of a remote laboratory has a positive effect on students' learning process. This report analyzes the effect of the use of VISIR in five different groups of students from two different academic years (2013-2014 and 2014-2015), with three teachers and at two educational levels. The empirical experience focuses on Ohm's Law. The results obtained are reported using a pretest and post-test design. The tests were carefully designed and analyzed, and their reliability and validity were assessed. The analysis of knowledge test question results shows that the post-test scores are higher that the pretest. The difference is significant according to Wilcoxon test (p < 0.001), and produces a Cohen effect size of 1.0. The VISIR remote laboratory's positive effect on students' learning processes indicates that remote laboratories can produce a positive effect in students' learning if an appropriate activity is used.

  • 54.
    Gaszczyk, Dariusz
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Wearable Assistant For Monitoring Solitary People2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Master Thesis presents the system consisting of software and components of Arduinoplatform along with modules compatible with it, intended for use indoor. The device fulfils thefollowing requirements which are: to ensure privacy preservation, low energy consumptionand the wireless nature.

    This thesis reports the development of a prototype that would ensure step detection,posture detection, indoor localization, tumble detection and heart rate detection using themicrocontroller, AltIMU-10 v4 module, heart rate monitor, WiFi module and battery. Veryimportant part of the thesis is algorithm, which uses comparison function. Thanks to thewireless nature of a prototype, the system collects data regardless of an environment and sendthem directly to every device supported by Microsoft Windows platform, Linux platform orOS X platform, which are monitored by the supervisor, who takes care of the solitary person.

    The main contributions of the prototype are: indoor localization, identification andclassification of occurring situations and monitoring vital signs of the solitary person.

    To ensure indoor localization the prototype must collect data from accelerometer. Ofcourse data from AltIMU-10 v4 module in basic form are useless for the supervisor, so thealgorithm, using by the prototype, is programmed to processing and filtering it.

    Algorithm is also used to identification and classification occurring situations. Datafrom accelerometer are processed by it and compared with the created pattern.

    Monitoring vital signs of the solitary person are more complicated function, because itrequires not only data from accelerometer, but also from heart rate monitor. This sensor isusing to the analyzing condition of the patient when dangerous situation occurs.

  • 55.
    Gatti, Pruthvi Venkatesh
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Velugubantla, Krishna Teja
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Contrast Enhancement of Colour Images using Transform Based Gamma Correction and Histogram Equalization2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Contrast is an important factor in any subjective evaluation of image quality. It is the difference in visual properties that makes an object distinguishable from other objects and background.

    Contrast Enhancement method is mainly used to enhance the contrast in the image by using its Histogram. Histogram is a distribution of numerical data in an image using graphical representation. Histogram Equalization is widely used in image processing to adjust the contrast in the image using histograms. Whereas Gamma Correction is often used to adjust luminance in an image.

    By combining Histogram Equalization and Gamma Correction we proposed a hybrid method, that is used to modify the histograms and enhance contrast of an image in a digital method. Our proposed method deals with the variants of histogram equalization and transformed based gamma correction. Our method is an automatically transformation technique that improves the contrast of dimmed images via the gamma correction and probability distribution of luminance pixels. The proposed method is converted into an android application.

    We succeeded in enhancing the contrast of an image by using our method and we have tested for different alpha values. Graphs of the gamma for different alpha values are plotted.

  • 56.
    Gertsovich, Irina
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nilsson, Mikael
    Lunds Universitet, SWE.
    Ström Bartunek, Josef
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Claesson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Automatic estimation of a scale resolution in forensic images2018Inngår i: Forensic Science International, ISSN 0379-0738, E-ISSN 1872-6283, Vol. 283, s. 58-71Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper proposes a new method for an automatic detection of a resolution of a scale or a ruler with graduation marks in the shoeprint images. The method creates a vector of the correlations estimated from the co-occurrence matrices for every row in a shoeprint image. The scale resolution is estimated from maxima in Fourier spectrum of the correlations’ vectors. The proposed method is evaluated on over 500 images taken at crime scenes and in a forensics laboratory. The experimental results indicate the possibility of applying the proposed method to automatically estimate the scale resolution in forensic images. The automatic detection of a scale resolution could be used to automatically rescale a forensic image before the printing this image in “one-to-one” scale. Furthermore, the proposed method could be used to automatically rescale images to an equal scale thus allowing to compare the images digitally. © 2017 Elsevier B.V.

  • 57.
    Ghandchi, Bahram
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Saleh, Taha
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Indoor Mobile Positioning system (MPS) classification in different wireless technology domain2018Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The main purpose of this thesis work is to find and compare different network characteristics of MPS (Mobile Positioning System) in the different wireless technology domains. Since decades ago MNO’s (Mobile Network Operators) added many new services based on the geographical areas of subscribers and their needs. Here we define wireless networks and go through different types of technologies and do the comparison when they collect different types of data for their location-based services and see if we could have the same accuracy with 2G (second generation) of mobile network as like as 3G (third generation) and higher. Finally, we will come up with a proposal for new age technology.

  • 58.
    Ghanian, Nariman
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Farhang Esfahani, William Mohammad
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Hassan, Muhammad Touqeer Ul
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Electrical energy analysis in nine countries of Europe, with focus on wind power and other renewable energy sources2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This thesis has been written for the Bachelor degree in Electrical Engineering held at Blekinge Tekniska Högskola Karlskrona, Sweden. The basis of this thesis is a statistical analysis of the electrical energy situation with emphasis on contribution of wind power and other renewable energy in electricity production in the European area and key countries.

     

    The main parameters, which considered in this thesis are electricity production and consumption, installed capacity trends and also the operation of renewable sources, especially wind power in gross electricity generation. Meanwhile, the whole date and materials are based on real values and investigated from the latest publications of governments and energy agencies of European union and key countries.

     

    The target of European renewable energy is that the member countries must achieve at least 20 percent of final energy consumption from renewable energy by 2020. Germany, United Kingdom, Spain and France and Portugal are members of the highest consumers of electricity in the Europe and still the main source of electrical production in these countries are fossil fuels, the main challenge is that they should start to shutting down the traditional power plant and improve the infrastructure for installing the renewable electrical capacity instead.

     

    According to the statistics, many of the European countries such as United Kingdom, Germany, Spain, Denmark and Sweden have started up to use the renewable energy to produce the electrical energy, but their governments have special keen eye for investment in the wind energy sector. Wind power grew sharply during the past decades in Europe and becoming vital every coming day in comparison to other renewable energy, since the low cost of electricity can be granted through a small investment and relies on the wind blowing compared to the conventional electricity generation sources. The diagrams demonstrate the wind power has a main portion to producing the electrical energy and every year a considerable amount of installed capacity is added to the total electrical grid.

     

    In addition, the expansion of renewable energy  to achieve the high percent of electrical production requires  the improvement of  infrastructure such as ecological research and high coordination between different organizations. Also, the electrical generation cannot be constant, and in winter the overall consumption and demand for electricity increases all over Europe. The exploitation of some renewable sources such as solar and wind power for electrical production can have fluctuation due to the weather condition and wind speed, which can affect the overall generation to the electrical grid.

     

    Therefore, the balancing of several renewable sources in different seasons,  needs the unique power management for reliable electrical production. In this trend, Norway is a successful country in Europe that uses over 90 percent of  renewable sources for total electrical generation. The thesis has covered these challenges and how they are overcoming these issues.

  • 59.
    Gharari, Farnaz
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance Analysis of Piecewise-and-Forward Relay Network on Rayleigh Fading Channel2015Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    The rapid changes and developments in cellular and wireless networks aim to provide more reliable communications with high data rate transmission. So far, one solution which is being considered for improving the reliability and eciency of mobile communications is cooperative communications. Implementing di fferent relay scenarios leads to the improvement of the security, ecient, and fast transmission with a good quality of service. The work of this thesis is on the piecewise-and-forward (PF) relay network. This relay protocol is implemented for decreasing the complexity of signal detection at the receiver. Our focus is to investigate the performance of PF relay networks based on the statistical variations which are caused by the fading environment. We considered a relay network with one source and one destination while multiple parallel relays aid the transmission process. At the destination the maximum likelihood (ML) method is implemented for detecting the received signals. Therefore, the probability density function (PDF) of received signals should be used at the ML detector. We analytically investigate the PDF of the received signals, when the transmitted signals are faced with Rayleigh fading. For verifying the theoretical calculations, we use Monte-Carlo simulations in MATLAB to evaluate the results. Afterwards, the bit error rate (BER) has been considered for investigating the performance of the PF relay network over a Rayleigh fading channel. Furthermore, the BER performance of the PF relay network is compared with three well known relay networks, amplify-and-forward (AF), decode-and forward (DF), and estimate-and-forward (EF) relay networks.

  • 60.
    Gharari, Farnaz
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Chu, Thi My Chinh
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Zepernick, Hans-Jürgen
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Performance Analysis of a Piecewise-and-Forward Relay Network on Rayleigh Fading Channels2015Inngår i: 2015 9TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS), IEEE Communications Society, 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper, we analyse the performance of a cooperative communication network with multiple piecewise-and-forward (PF) relays on Rayleigh fading channels taking the random nature of the channel variations into account. In particular, the probability density function (PDF) of the received signals at the destination of the considered multiple PF relay network is derived for the case of Rayleigh fading. The PDF is then used to support the maximum likelihood detection at the destination. Simulation results are provide to compare the bit error rate (BER) performance of the PF protocol in a multiple relay network with the performance of the amplify-and-forward (AF), decode-and-forward (DF), and estimate-and-forward (EF) protocols on Rayleigh fading as well as additive white Gaussian noise (AWGN) channels. The results indicate that the PF protocol outperforms the EF protocol in the low signal-to-noise ratio (SNR) regime while it is slightly inferior to the EF protocol for high SNR. This behavior is more pronounced over Rayleigh fading compared to AWGN.

  • 61.
    Ghodrati, Ashkan
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Rashid, Ahmed
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Modelling and Simulation of a Power Take-off in Connection with Multiple Wave Energy Converters2014Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    The objective of this thesis is to develop a model that will integrate multiple buoys to a power take-off hub. The model will be derived using a time domain analysis and will consider the hydraulic coupling of the buoys and the power take-off. The derived model is reproduced in MATLAB in order to run simulations. This will give possibility to conduct a parameter study and evaluate the performance of the system. The buoy simulation model is provided by Wave4Power (W4P). It consists of a floater that is rigidly connected to a fully submerged vertical (acceleration) tube open at both ends. The tube contains a piston whose motion relative to the floater-tube system drives a power take-off mechanism. The power take-off model is provided by Ocean Harvesting Technologies AB (OHT). It comprises a mechanical gearbox and a gravity accumulator. The system is utilized to transform the irregular wave energy into a smooth electrical power output. OHT's simulation model needs to be extended with a hydraulic motor at the input shaft. There are control features in both systems, that need to be connected and synchronized with each other. Another major goal within the thesis is to test different online control techniques. A simple control strategy to optimize power capture is called sea-state tuning and it can be achieved by using a mechanical gearbox with several discrete gear ratios or with a variable displacement pump. The gear ratio of the gear box can be regulated according to a 2D look up table based on the average wave amplitude and frequency over a defined time frame. The OHT power take-off utilizes a control strategy, called spill function, to limit the excess power capture and keep the weight accumulator within a span by disengaging the input shaft from the power take-off. This is to be modified to implement power limitation with regulation of the gear ratio of the gearbox.

  • 62.
    Gholamhosseinpour, Ali
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Millimeter Wave Radar Interfacing with Android Smartphone2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Radar system development is generally costly, complicated and time consuming. This has kept its presence mostly inside industries and research centers with the necessary equipment to produce and operate such a system. Until recent years, realization of a fully integrated radar system on a chip was not feasible, however this is no longer the case and there are several types of sensors available from different manufacturers.

    Radar sensors offer some advantages that are unmatched by other sensing and imaging technologies such as operation in fog, dust and over long distances. This makes them suitable for use in Navigation, Automation, Robotics, and Security systems applications. The purpose of this thesis is to demonstrate the feasibility of a simplified radar system’s user interface via integration with the most common portable computer, a Smartphone, to make it possible for users with minimal knowledge of radar systems design and operation to use it in different applications.

    Smartphones are very powerful portable computers equipped with a suite of sensors with the potential to be used in a wide variety of applications. It seems logical to take advantage of their computing power and portability. The combination of a radar sensor and a smartphone can act as a demonstrator in an effort to bring radar sensors one step closer to the hands of the developers and consumers.

    In this study the following areas are explored and proper solutions are implemented;

    • Design of a control board with capability to drive a radar sensor, capture the signal and transfer it to a secondary device (PC or Smartphone) both wired and wirelessly e.g. Bluetooth.
    • A firmware that is capable of driving the control board and can receive, interpret and execute messages from a PC and or a Smartphone
    • A cross compatible master software that can run on Linux, Windows, Mac and Android OSs and is capable of communication with the firmware/control board
    • Proper analysis methods for signal capture and process purposes
    • Automation of some parameter adjustment for different modes of operation of the Radar System in order to make the user interface as simple as possible
    • A user friendly user-interface and API that can run on both PC and Smartphone 
  • 63.
    Gidla, Vijay Kiran
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    IMPLEMENTATION  AND EVALUATION OF AUDITORY MODELS FOR HUMAN ECHOLOCATION2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Blind  people use echoes to detect  objects  and  to  find their  way, the  ability  being known as human echolocation.   Previous  research  have found some of the  favorable  conditions  for the  detection  of the object,  with  many  factors  yet  to  be analyzed  and  quantified.    Studies  have  also shown  that blind people are more efficient than  the  sighted  in echolocating,  with  the  performance  varying  among  the individuals.   This  motivated the  research  in human  echolocation  to move in a new direction  to get a fuller understanding for the high detection  of the blind.  The psychoacoustic  experiments solely cannot determine  how the superior echo detection  of the blind listeners should be attributed to perceptual or physiological causes.  Along with the perceptual results it is vital to know how the sounds are processed in the  auditory system.   Hearing  research  has led to the  development of several auditory  models by combining  the  physiological  and  psychological  results  with  signal  analysis  methods.    These  models try  to describe how the auditory system  processes the signals.  Hence, to analyze how the sounds are processed for the high detection  of the blind, auditory  models available  in the literature were used in this thesis.  The results  suggest  that repetition pitch  is useful at  shorter  distances  and is determined from the peaks in the temporal  profile of the autocorrelation function computed  on the neural activity pattern. Loudness attribute also plays a role in providing information  for the listeners to echolocate at shorter  distances.  At longer distances  timbre  aspects such as sharpness  information  might be used by the listeners  to detect  the objects.  It was also found that the repetition pitch,  loudness and sharpness attributes in turn  depend on the room acoustics  and type of the stimuli  used.  These results  show the fruitfulness  of combining  results  from different  disciplines  through  a mathematical framework  given by signal analysis.

  • 64.
    GOGINENI, SRI LOHITH
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    DEVELOPMENT OF AN ROI AWARE FULL-REFERENCE OBJECTIVE PERCEPTUAL QUALITY METRIC ON IMAGES OVER FADING CHANNEL2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In spite of technological advances in wireless systems, transmitted data suffers from impairments through both lossy source coding and transmission overerror prone channels. Due to these errors, the quality of multimedia content is degraded. The major challenge for service providers in this scenario is to measure the perceptual impact of distortions to provide certain Quality of Experience(QoE) to the end user. The general tendency of the Human Visual System (HVS) suggests that the artifacts in the Region-of-Interest (ROI) are perceived to be more annoying compared to the artifacts in Background (BG). With this assumption, the thesis aims to measure the quality of image over ROI and BG independently. Visual Information Fidelity (VIF), a full-reference image quality assessment is chosen for this purpose. Finally, the metric measured over ROI and BG are pooled to get a ROI aware metric. The ROI aware metric is used to predict the Mean Opinion Score (MOS) of an image. In this study, an ROI aware quality metric is used to measure the quality of a set of distorted images generated using a wireless channel. Eventually, MOS of the distorted images is estimated. Lastly, the predicted MOS is validated with the MOS obtained from subjective tests. Testing the proposed image quality assessment approach shows an improved prediction performance of ROI aware quality metric over traditional image quality metrics. It is also observed that the above approach provides a consistent improvement over a wide variety of distortions. After extensive research, the obtained results suggest that the impairments in the ROI are perceived to be more annoying than that of the BG.

  • 65.
    Gothberg, Mattias
    et al.
    Atlas Copco, SWE.
    Enblom, Samuel
    Atlas Copco, SWE.
    Rantakokko, Renny
    Atlas Copco, SWE.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling. Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för elektroteknik. Blekinge Tekniska Högskola, Institutionen för signalbehandling. Blekinge Tekniska Högskola, Sektionen för teknik, Avdelningen för signalbehandling. Blekinge Inst Technol, Dept Appl Signal Proc, Karlskrona, Sweden..
    EFFICIENT MULTI CHANNEL VIBRATION MEASUREMENT-SYSTEMATIC APPROACH2016Inngår i: PROCEEDINGS OF THE 23RD INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: FROM ANCIENT TO MODERN ACOUSTICS / [ed] Vogiatzis, K Kouroussis, G Crocker, M Pawelczyk, M, INT INST ACOUSTICS & VIBRATION , 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In Atlas Copco a wide range of machines is produced from surface drill rigs, exploration drill rigs, underground drill rigs both for mining and construction to underground loader and haulers for mines. Recently new rock excavation methods have developed in cooperation with large mining companies. The machines are produced in low volume and often customized although having a modular approach. Time for validation is limited due to machines available for test are planned for customer delivery. It is on regular basis needed to validate and investigate vibrational behavior of installations as power packs and drivelines to get loads for simulation, identify resonances, operational deflection shapes, and vibration and stress levels for life length estimations under operational conditions. The time for a 40-180 Channel measurement is now down the range of 13 days. To reduce the time it takes to perform measurement a systematic approach has been taken that includes mainly three areas. First the Bookkeeping of all information and data needed for the analysis and reporting is input before or during the measurement. Systematic Approach of how to setup sensors, handle cable and equipment, planning and measurement. This includes practical examples of how to. Finally it is very important to take steps to assure Quality early in the measurement and also avoiding disturbances in the sensor path. There will be practical examples of important disturbances to look out for and quality check to perform. It should also be noted that the measurements is regular measured in mines or start up halls under rpm sweeps or/and operating conditions of the machines.

  • 66.
    Gradolewski, Dawid
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Magenes, Giovanni
    Univ Pavia, ITA.
    Johansson, Sven
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    A Wavelet Transform-Based Neural Network Denoising Algorithm for Mobile Phonocardiography2019Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, nr 4, artikkel-id 957Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Cardiovascular pathologies cause 23.5% of human deaths, worldwide. An auto-diagnostic system monitoring heart activity, which can identify the early symptoms of cardiac illnesses, might reduce the death rate caused by these problems. Phonocardiography (PCG) is one of the possible techniques able to detect heart problems. Nevertheless, acoustic signal enhancement is required since it is exposed to various disturbances coming from different sources. The most common denoising enhancement is based on the Wavelet Transform (WT). However, the WT is highly susceptible to variations in the noise frequency distribution. This paper proposes a new adaptive denoising algorithm, which combines WT and Time Delay Neural Networks (TDNN). The acquired signal is decomposed by means of the WT using the coif five-wavelet basis at the tenth decomposition level and then provided as input to the TDNN. Besides the advantage of adaptive thresholding, the reason for using TDNNs is their capacity of estimating the Inverse Wavelet Transform (IWT). The best parameters of the TDNN were found for a NN consisting of 25 neurons in the first and 15 in the second layer and the delay block of 12 samples. The method was evaluated on several pathological heart sounds and on signals recorded in a noisy environment. The performance of the developed system with respect to other wavelet-based denoising approaches was validated by the online questionnaire.

  • 67.
    Gudipudi, Venkata Naga Manikanta Aditya
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Detection and velocity of a fast moving object2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Over a past few years, technology is constructing the way humans live. With the rapid growth towards Internet of Things (IOT) and other connected services, companies are investigating the ways to enhance current living conditions. There are several devices that are launched in the market to help people to increase flexibility and most of all, to see beyond what is possible. It is helping us reinforce ourselves in our day to day activities. Even in sports, thanks to the latest technological developments, most people’s lives have been enhanced and simplified. Advances in technology has a huge impact on sports which includes- analysis of sport performance, improvements in design of sports equipment and facilitate coaches to provide feedback on players’ performance. Sports equipment continually undergoing research and development to improve sporting performance ensuring a superior game and positive results.

    Significant technology such as smart gear is popular among athletes to analyse their performance. The equipment usually includes sensors controlled by microcontrollers. The main contribution of this thesis is to investigate the possibilities of a suitable sports equipment to detect and calculate speed of a fast-moving object and providing the drawbacks while using different sensors.

    In this thesis, IR/Laser sensors, along with a Doppler radar module were tested to put forward a best suitable method to calculate the speed of a fast-moving object and transmit the data over a network.

  • 68.
    Gunnarsson, Jenny
    et al.
    Blekinge Tekniska Högskola, Biblioteket.
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Pettersson, Anette
    Blekinge Tekniska Högskola, Biblioteket.
    Teaching International Students How to Avoid Plagiarism: Librarians and Faculty in Collaboration2014Inngår i: The journal of academic librarianship, ISSN 0099-1333, E-ISSN 1879-1999, Vol. 40, nr 3/4Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents how a plagiarism component has been integrated in a Research Methodology course for Engineering Master students at Blekinge Institute of Technology, Sweden. The plagiarism issue was approached from an educational perspective, rather than a punitive. The course director and librarians developed this part of the course in close collaboration. One part of the course is dedicated to how to cite, paraphrase and reference, while another part stresses the legal and ethical aspects of research. Currently, the majority of the students are international, which means there are intercultural and language aspects to consider. In order to evaluate our approach to teaching about plagiarism, we conducted a survey. The results of the survey indicate a need for education on how to cite and reference properly in order to avoid plagiarism, a result which is also supported by students' assignment results. Some suggestions are given for future development of the course.

  • 69.
    Gustavsson, Ingvar
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nilsson, Kristian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Zackrisson, Johan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Alves, G.R.
    Fidalgo, A.V.
    Claesson, L.
    Zubia, J.G.
    Jayo, U.H.
    Castro, M.
    Diaz Orueta, G.
    Loro, F.G.
    Lab sessions in VISIR laboratories2016Inngår i: Proceedings of 2016 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016, IEEE Press, 2016, s. 350-352Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Experimental activities with real components are an essential part of all courses including or devoted to electrical and electronic circuits theory and practice. The knowledge triangle composed of hand-written exercises, simulations and traditional lab experiments has been enriched with the possibility for students to conduct real experiments over the Internet, using remote labs. This tutorial is devoted to one such remote lab named Virtual Instrument Systems in Reality (VISIR). The Global Online Laboratory Consortium (GOLC) elected VISIR as the best remote controlled laboratory in the world, at the first time this distinction was awarded. At the end of this tutorial, attendees are expected to know what is VISIR, what can (not) be done with it, who is currently using it, and how can one integrate it in a given course curriculum.

  • 70.
    Gustavsson, Ingvar
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Zackrisson, Johan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Lundberg, Jenny
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kreativa teknologier.
    VISIR work in progress2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The VISIR (Virtual Instrument Systems in Reality) Open Lab Platform is an architecture that enable universities, secondary schools, and other organizations to open instructional laboratories for remote access with preserved context. VISIR emanates from a feasibility study made in 1999 at BTH (Blekinge Institute of Technology) in Sweden. Today, VISIR laboratories are online at seven universities globally where thousands of students can work and conduct most experiments that can be performed on a solderless breadboard remotely without any risk of being harmed. IAOE (International Association of Online Engineering has organized SIG VISIR a Special Interest Group for VISIR. Further development of the platform is carried out in this Community. This paper is about work in progress especially at BTH.

  • 71.
    Göthberg, Mattias
    et al.
    Atlas Copco, SWE.
    Enblom, Samuel
    Atlas Copco, SWE.
    Rantakokko, Renny
    Atlas Copco, SWE.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Efficient multi channel vibration measuremen: systematic approach2016Inngår i: ICSV 2016 - 23rd International Congress on Sound and Vibration: From Ancient to Modern Acoustics, 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In Atlas Copco a wide range of machines is produced from surface drill rigs, exploration drill rigs, underground drill rigs both for mining and construction to underground loader and haulers for mines. Recently new rock excavation methods have developed in cooperation with large mining companies. The machines are produced in low volume and often customized although having a modular approach. Time for validation is limited due to machines available for test are planned for customer delivery. It is on regular basis needed to validate and investigate vibrational behavior of installations as power packs and drivelines to get loads for simulation, identify resonances, operational deflection shapes, and vibration and stress levels for life length estimations under operational conditions. The time for a 40-180 Channel measurement is now down the range of 1-3 days. To reduce the time it takes to perform measurement a systematic approach has been taken that includes mainly three areas. First the Bookkeeping of all information and data needed for the analysis and reporting is input before or during the measurement. Systematic Approach of how to setup sensors, handle cable and equipment, planning and measurement. This includes practical examples of how to. Finally it is very important to take steps to assure Quality early in the measurement and also avoiding disturbances in the sensor path. There will be practical examples of important disturbances to look out for and quality check to perform. It should also be noted that the measurements is regular measured in mines or start up halls under rpm sweeps or/and operating conditions of the machines.

  • 72.
    Hartman, Andreas
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    An Evaluation of Interpolation and Oversampling Effects on Image Quality in Synthetic Aperture Radar Processing with Global Back-projection2014Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [en]

    For time domain SAR processing algorithms, such as Global Back-projection, interpolation becomes a part of the implementation. In order for the interpolation to yield good results, the oversampling rate used in the sampling of the original data may constitute an important factor. Therefore, the choice of oversampling rate and type of interpolation technique may influence the SAR image quality achieved in images focused with Global Back-projection. The influence of the oversampling rate on the image quality in back-projected SAR impulse response functions is investigated. An attempt to propose useful oversampling rates which yields acceptable SAR image quality is made. Also, nearest neighbor and linear interpolation are compared. Illustration of how the image quality degradation is manifested in the SAR impulse response functions and how image quality measurements considering the azimuth direction exclusively may be used to evaluate the image quality behavior is provided. The investigation is based on an analysis of simulated SAR impulse response functions and the image quality measures of these. The SAR image quality is measured with two common measures, the Integrated Side Lobe Ratio and Peak Side Lobe Ratio. Results are presented for two systems with different fractional and Doppler bandwidths. The results show that the choice of oversampling rate affects the SAR image quality, with significant degradation at the lowest oversampling rates. However, the results indicate that Global Back-projection may offer acceptable SAR image quality already with rather low oversampling rates. Nearest neighbor and linear interpolation display similar SAR image quality. But linear interpolation produces smooth impulse responses, while nearest neighbor interpolation introduces ringing.

  • 73.
    Hasan, Mohammad Kamrul
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Hossain, Faham
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Earth Fault Currents in Three Phase systems2015Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    This paper focuses on the grounding methods for distribution systems and the characteristics and behavior of earth fault currents. At First different existing grounding methods such as isolated neutral, solidly grounded, Resonant grounding, low and high impedance groundings are introduced. Secondly, focus is placed on further describing these methods and the viability of each of these methods in different scenarios. Then these methods are further analyzed by using equivalent circuit designs. Using the equivalent circuit helps to derive the formulations and equations. It is shown that the designing of these systems in fact follows basic electrical properties such as voltage dividing and current dividing principles. The derived equations are further tested experimentally to prove the characteristics and behavior of these methods. Finally, the report is concluded by testing some of these methods (isolated neutral and grounding via resistor methods) in the laboratory and the results obtained are analyzed with the theoretical results to determine the characteristics and behavior of these methods. In this manner it is shown experimentally that in case of isolated neutral systems the summation of currents through all the phases (current flow through the line model) is zero when there is no earth fault. In case of an earth fault occurring across one of the phases the neutral-to-ground voltage becomes equal to the voltage across the faulted phase and also the sum of currents passing through the healthy phases is equal to the current flowing through the faulted phase. This phenomenon is proved in the second experiment. The third experiment proves the relation between the earth fault current and current via the resistor and the currents via the healthy phases whereby it is shown that the fault current is equal to the root square summation of currents of resistor and healthy phases. This is one of the characteristics of grounded via resistor system. The next experimental setup also focuses on the characteristics of grounded via resistor system whereby it is shown that the fault current and the total phase current are independent of any external load. The last experiment proves the phenomenon that phase-to-phase voltage remains intact during times of earth fault and the system continues the operation uninterrupted as it should be in case of isolated neutral grounding system.

  • 74.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    The Fourier Transform in Sound and Vibration2015Inngår i: International Journal of Acoustics and Vibration, ISSN 1027-5851, ISSN 1027-5851, Vol. 20, nr 4, s. 190-190Artikkel i tidsskrift (Fagfellevurdert)
  • 75.
    Idrisoglu, Alper
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Wireless Sensor System for Monitoring Sportsmen Exposed to Hazardous Concussions2019Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Sport-related Traumatic Brain injuries (TBI) are a major problem in ice hockey. Reports show that it occurs 160 concussion per 1000 hours of play time and 4.6% of head injuries leads to a concussion in Sweden. A system that can monitor the players in real time and indicate an impact can contribute to better understanding the biomechanical etiology of a concussion.

    Purpose of this project is to test the ability of a wireless sensor network for monitoring the g-Forces that affect the head of the ice hockey players in real-time.

    We build a wireless sensor network system called g-Force Monitoring System (GFMS) by implementing a Web Socket connection between the sensor nodes and the server. The sensor measures and transmits the data over the Web Socket protocol to the server and the server registers and allows monitoring of the g-Force values in real-time.

    We achieved a 6 ms sampling rate by using the g-Force Monitoring System. The system was able to operate during one hour play time without any significant problem. The stored data shows that the GFMS has an ability to indicate impact and its duration over a predefined threshold. The user of the system can monitor the g-Force data in real time or can do analyzes on stored values.

    The GFMS can deliver valuable indications. If the system can come to existence and be implemented into the ice hockey helmets, by letting medical experts to look at and analyze the g-Force data, it can decrease the diagnosis and recovery time of a concussion. It can help to make the Ice hockey arena to a safer place without having to change the rhythm of the game.

  • 76.
    Imran, khan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    MRI Scanner’s Vibration Isolation: Experimental Measurements, Analysis Techniques and Analytical Models2017Rapport (Annet vitenskapelig)
    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.

  • 77. Jachimczyk, B.
    et al.
    Dziak, D.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance improvement of NN based RTLS by customization of NN structure: Heuristic approach2015Inngår i: Proceedings of the International Conference on Sensing Technology, ICST, IEEE Computer Society, 2015, s. 278-283Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The purpose of this research is to improve performance of the Hybrid Scene Analysis - Neural Network indoor localization algorithm applied in Real-time Locating System, RTLS. A properly customized structure of Neural Network and training algorithms for specific operating environment will enhance the system’s performance in terms of localization accuracy and precision. Due to nonlinearity and model complexity, a heuristic analysis is suitable to evaluate NN performance for different environmental conditions. Efficiency of the proposed customization of a Neural Network is verified by simulations and validated by physical experiments. This research also concerns the influence of size of Neural Network training set. The results prove that, better localization accuracy is with a NN system which is properly customized with respect to a training method, number of neurons and type of transfer function in the hidden layer and also type of transfer function in the output layer.

  • 78.
    Jachimczyk, Bartosz
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling. DAC SA.
    Real-time Locating Systems for indoor applications: the methodological customization approach2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Emerging wireless technologies increase the potential and effectiveness of wireless Real-time Locating Systems (RTLSs), which precisely localize the position, and identify things and people in real time. Among many applications, RTLSs are widely used in the industrial sector for indoor logistics and safety applications. However, signal interferences, which affect the system’s performance, are a serious issue of all indoor RTLS applications. Among others, the interferences are caused by the changeable working environment, the geometry and structure of the space, furnishing, and other obstacles. A customization of the RTLS’s architecture and localization algorithm may provide a way to overcome the interference problem and then enhance the systems’ performance.

    The objective of this thesis is to develop and implement customization methods, which enhance system performance in the changeable working environment without compromising the functional and non-functional requirements defined by future users and stakeholders. The customized solution is to be based on the comprehensive methodological analysis of the system’s technical and environmental constraints, along with the requirements specified by the application field. The customization process covers the selection, adjustment and adaptation of the wireless technologies and methods in order to enhance the location system’s performance, in terms of accuracy and precision without compromising its simplicity and price.

    In this research, wireless technologies of Radio Frequency Identification (RFID) and Ultra-wideband (UWB) are applied. The related indoor localization methods, such as, ranging techniques based on Received Signal Strength (RSS) and Angle of Arrival (AoA), are a thesis focus. Moreover, estimation methods like Fingerprinting and Angulation are used.

    One of the proposed customization methods of RFID-based 3D RTLS, refers to the heuristic analysis-based optimization of a number and configuration of readers. For the same type of system, an alternative way of performance improvement is a customization of localization algorithm, explicitly the Neural Network-based estimation algorithm and its structural features and training methods.

    Also in this thesis, performance improvement methods of the AoA-based RTLS operating in an UWB technology are proposed. The proposed customization of this system type is based on the uncertainty pattern defined by a statistical uncertainty model, which maps the localization uncertainty in terms of precision in the 2D workspace. The model depicts how the localization uncertainty depends on an arrangement of Location Sensors and workspace geometry. Another proposed customization method is realized by defining and implementing correction vectors for different working environments, which enhance the system’s performance in terms of its accuracy.

    This thesis consists of two parts. Part I, Prolegomena, presents the overview of applied theories and research methods. This part aims to illustrate the links between the articles constituting the second part of the dissertation. Part II, Papers consists of five reformatted papers already published in peer reviewed journals and conferences.

  • 79.
    Jachimczyk, Bartosz
    et al.
    BetterSolutions S.A., POL.
    Dziak, Damian
    Politechnika Gdanska, POL.
    Czapla, Jacek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Damps, Pawel
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    IoT on-board system for driving style assessment2018Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 18, nr 4, artikkel-id 1233Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The assessment of skills is essential and desirable in areas such as medicine, security, and other professions where mental, physical, and manual skills are crucial. However, often such assessments are performed by people called “experts” who may be subjective and are able to consider a limited number of factors and indicators. This article addresses the problem of the objective assessment of driving style independent of circumstances. The proposed objective assessment of driving style is based on eight indicators, which are associated with the vehicle’s speed, acceleration, jerk, engine rotational speed and driving time. These indicators are used to estimate three driving style criteria: safety, economy, and comfort. The presented solution is based on the embedded system designed according to the Internet of Things concept. The useful data are acquired from the car diagnostic port—OBD-II—and from an additional accelerometer sensor and GPS module. The proposed driving skills assessment method has been implemented and experimentally validated on a group of drivers. The obtained results prove the system’s ability to quantitatively distinguish different driving styles. The system was verified on long-route tests for analysis and could then improve the driver’s behavior behind the wheel. Moreover, the spider diagram approach that was used established a convenient visualization platform for multidimensional comparison of the result and comprehensive assessment in an intelligible manner. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.

  • 80.
    Jachimczyk, Bartosz
    et al.
    BetterSolutions, POL.
    Dziak, Damian
    Politechnika Gdanska, POL.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Customization of UWB 3D-RTLS based on the new uncertainty model of the AoA ranging technique2017Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, nr 2, artikkel-id 227Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The increased potential and effectiveness of Real-time Locating Systems (RTLSs) substantially influence their application spectrum. They are widely used, inter alia, in the industrial sector, healthcare, home care, and in logistic and security applications. The research aims to develop an analytical method to customize UWB-based RTLS, in order to improve their localization performance in terms of accuracy and precision. The analytical uncertainty model of Angle of Arrival (AoA) localization in a 3D indoor space, which is the foundation of the customization concept, is established in a working environment. Additionally, a suitable angular-based 3D localization algorithm is introduced. The paper investigates the following issues: the influence of the proposed correction vector on the localization accuracy; the impact of the system’s configuration and LS’s relative deployment on the localization precision distribution map. The advantages of the method are verified by comparing them with a reference commercial RTLS localization engine. The results of simulations and physical experiments prove the value of the proposed customization method. The research confirms that the analytical uncertainty model is the valid representation of RTLS’ localization uncertainty in terms of accuracy and precision and can be useful for its performance improvement. The research shows, that the Angle of Arrival localization in a 3D indoor space applying the simple angular-based localization algorithm and correction vector improves of localization accuracy and precision in a way that the system challenges the reference hardware advanced localization engine. Moreover, the research guides the deployment of location sensors to enhance the localization precision.

  • 81. Jachimczyk, Bartosz
    et al.
    Dziak, Damian
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Using the fingerprinting method to customize RTLS based on the AoA ranging technique2016Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 16, nr 6, artikkel-id 876Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Real-time Locating Systems (RTLSs) have the ability to precisely locate the position of things and people in real time. They are needed for security and emergency applications, but also for healthcare and home care appliances. The research aims for developing an analytical method to customize RTLSs, in order to improve localization performance in terms of precision. The proposed method is based on Angle of Arrival (AoA), a ranging technique and fingerprinting method along with an analytically defined uncertainty of AoA, and a localization uncertainty map. The presented solution includes three main concerns: geometry of indoor space, RTLS arrangement, and a statistical approach to localization precision of a pair of location sensors using an AoA signal. An evaluation of the implementation of the customized RTLS validates the analytical model of the fingerprinting map. The results of simulations and physical experiments verify the proposed method. The research confirms that the analytically established fingerprint map is the valid representation of RTLS’ performance in terms of precision. Furthermore, the research demonstrates an impact of workspace geometry and workspace layout onto the RTLS’ performance. Moreover, the studies show how the size and shape of a workspace and the placement of the calibration point affect the fingerprint map. Withal, the performance investigation defines the most effective arrangement of location sensors and its influence on localization precision. © 2016 by the authors; licensee MDPI, Basel, Switzerland.

  • 82. Jachimczyk, Bartosz
    et al.
    Dziak, Damian
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance analysis of an RFID-based 3D indoor positioning system combining scene analysis and neural network methods2013Inngår i: Scientific Papers of Faculty of Electrical and Control Engineering Gdansk University of Technology, ISSN 1425-5766, nr 34, s. 29-33Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    The main purpose of this research is to improve localization accuracy of an active Radio Frequency Identification, RFID tag, in 3D indoor space. The paper presents a new RFID based 3D Indoor Positioning System which shows performance improvement. The proposed positioning system combines two methods: the Scene Analysis technique and Artificial Neural Network. The results of both simulation using Log-Distance Path Loss Model and physical experiments validate that the proposed positioning system improves the localization accuracy of an RFID tag compared with well-known Scene Analysis technique solutions

  • 83. Jachimczyk, Bartosz
    et al.
    Dziak, Damian
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    RFID: Hybrid Scene Analysis-Neural Network System for 3D Indoor Positioning optimal system arrangement approach2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The purpose of this research is to find an optimal number and configuration of readers in RFID based 3D Indoor Positioning System. The system applies a Hybrid Scene Analysis - Neural Network algorithm to estimate target's position with a desired accuracy. The system's accuracy and cost depend on a number of utilized readers and their arrangement. Readers' deployment is crucial for the localization accuracy too. The system optimization enhances the system cost-efficiency. The arrangement analysis was based on simulations and validated by physical experiment. The results of this research define a trade-off between a number of readers and their deployment and the system performance in terms of localization accuracy.

  • 84.
    Jacob, Sögaard
    et al.
    Tech Univ Denmark, DEN.
    Shahid, Muhammad
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Jeevan, Pokhrel
    Montimage, FRA.
    Kjell, Brunström
    Acreo Swedish ICT AB, SWE.
    On Subjective Quality Assessment of Adaptive Video Streaming via Crowdsourcing and Laboratory Based Experiments2017Inngår i: Multimedia tools and applications, ISSN 1380-7501, E-ISSN 1573-7721, Vol. 76, nr 15, s. 16727-16748Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Video streaming services are offered over the Internet and since the service providers do not have full control over the network conditions all the way to the end user, streaming technologies have been developed to maintain the quality of service in these varying network conditions i.e. so called adaptive video streaming. In order to cater for users’ Quality of Experience (QoE) requirements, HTTP based adaptive streaming solutions of video services have become popular. However, the keys to ensure the users a good QoE with this technology is still not completely understood. User QoE feedback is therefore instrumental in improving this understanding. Controlled laboratory based perceptual quality experiments that involve a panel of human viewers are considered to be the most valid method of the assessment of QoE. Besides laboratory based subjective experiments, crowdsourcing based subjective assessment of video quality is gaining popularity as an alternative method. This article presents insights into a study that investigates perceptual preferences of various adaptive video streaming scenarios through crowdsourcing based and laboratory based subjective assessment. The major novel contribution of this study is the application of Paired Comparison based subjective assessment in a crowdsourcing environment. The obtained results provide some novel indications, besides confirming the earlier published trends, of perceptual preferences for adaptive scenarios of video streaming. Our study suggests that in a network environment with fluctuations in the bandwidth, a medium or low video bitrate which can be kept constant is the best approach. Moreover, if there are only a few drops in bandwidth, one can choose a medium or high bitrate with a single or few buffering events.

  • 85.
    Jankowski, Patryk
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Szyszkiewicz, Przemysław
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Embedded control system for the Shower of the Future2017Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The Orbital Systems Company faces the really important issues such a lack of water, sewerage and even public health infrastructure. Its proposition of the Shower of the Future, which is a high-tech purification system that recycles water was inspired by the NASA, spaceship technology with limited sources of water and can be the solution of these problems. Due to the patented technology, which bases on the special filters, it is possible to reuse water. This idea, which is used in the shower, allows on more than 90% savings in water usage and 80% savings in energy, while producing water that is cleaner than average tap water. The company aims to provide this special technology not only to the hotels or hospitals, but also to the regular house to maintain the sustainability issue and even achieve the economic profit.

    The Shower of the Future is a new technology still in the developing phase. To achieve the goals of the company, in the software part of the system, two important problems have to be solved. First of them is the management issue. At this moment, three different versions of the showers, which differ in hardware and in software are in used. Much more versions adjusted to the place of destination such as hotel or hospital are planned. To manage the codes and integrate all of the possible version of the shower, the company desires to create one compatible software to control all of them. The mechanisms to integrate the codes by managing the configurable parameters of the system and to auto detect the version of the shower are proposed in the work.

    The second company’s issue is the improvement of the control system. As performed research and tests show, the temperature control in the Shower of the Future is too slow and inaccurate. To solve this problem, the identification process of the model was conducted and the PID controllers for the heater were designed. Due to specific structure of the shower, which introduce delays and disturbances, a single PID controller is not sufficient to maintain the control system. As a final controller, the switching PID controller created from previously designed PID controllers is proposed. Thanks to it, the temperature rising time is reduced 2 times, the overshoot, which was equal to 5 °C does not appear and the steady state error is diminished. Thanks to improvement of the temperature control system, much less water is wasted and much more energy is saved.

    The Shower of the Future of the Orbital System, which nevertheless needs improvements and more work, is only the first step in creating a new paradigm for daily water usage. The company and its product seriously consider the sustainability and environment aspect.

  • 86.
    Jarzebowicz, Leszel
    et al.
    Gdansk Univ. Technol., POL.
    Karwowski, Krzysztof
    Gdansk Univ. Technol., POL.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Sensorless algorithm for sustaining controllability of IPMSM drive in electric vehicle after resolver fault2017Inngår i: Control Engineering Practice, ISSN 0967-0661, E-ISSN 1873-6939, Vol. 58, s. 117-126Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a sensorless algorithm designated for the emergency control of an interior permanent magnet synchronous motor (IPMSM) drive in electric or hybrid vehicle. Special requirements for emergency-activated sensorless algorithms are defined, and shortcomings of state-of-the-art methods in terms of the considered application are discussed. The proposed emergency-activated algorithm is based on analysing the derivatives of motor phase currents measured over the duration of particular inverter states. The method is computationally simple and does not require additional hardware since the derivatives are measured indirectly. A lag between activating the algorithm upon an emergency flying start and re-establishing the torque controllability is defined. The proposed algorithm was implemented in the controller of a laboratory IPMSM vehicle drive and tested under varying operational conditions, including the emergency activation. © 2016 Elsevier Ltd

  • 87.
    Javadi, Mohammad Saleh
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Dahl, Mattias
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Pettersson, Mats
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Design of a video-based vehicle speed measurement system: an uncertainty approach2019Inngår i: 2018 Joint 7th International Conference on Informatics, Electronics & Vision (ICIEV) and 2018 2nd International Conference on Imaging, Vision & Pattern Recognition (icIVPR), Kitakyushu, Japan, 2018, pp. 44-49., IEEE, 2019, artikkel-id 8640964Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Speed measurement is one of the key components of intelligent transportation systems. It provides suitable information for traffic management and law enforcement. This paper presents a versatile and analytical model for a video-based speed measurement in form of the probability density function (PDF). In the proposed model, the main factors contributing to the uncertainties of the measurement are considered. Furthermore, a guideline is introduced in order to design a video-based speed measurement system based on the traffic and other requirements. As a proof of concept, the model has been simulated and tested for various speeds. An evaluation validates the strength of the model for accurate speed measurement under realistic circumstances.

  • 88.
    Jaworski, Jacek
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Bates, Jason
    University of Vermont, USA.
    Sources of breathing pattern variability in the respiratory feedback control loop2019Inngår i: Journal of Theoretical Biology, ISSN 0022-5193, E-ISSN 1095-8541, Vol. 469, s. 148-162Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The variability of the breath-to-breath breathing pattern, and its alterations in disease, may hold information of physiologic and/or diagnostic value. We hypothesized that this variability arises from the way that noise is processed within the respiratory feedback control loop, and that pathologic alterations to specific components within the system give rise to characteristic alterations in breathing pattern variability. We explored this hypothesis using a computational model of the respiratory control system that integrates mechanical factors, gas exchange processes, and chemoreceptor signals to simulate breathing patterns subject to the influences of random variability in each of the system components. We found that the greatest changes in the coefficient of variation (CV) of both breathing amplitude and timing were caused by increases in lung resistance and impairments in gas exchange, both common features of pulmonary disease. This suggests that breathing pattern variability may reflect discernible deterministic processes involved in the control of breathing. © 2019 Elsevier Ltd

  • 89.
    Johari Varnoosfaderani, Mohammad
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Economical Debug Station For debugging 3G modem2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Communication world is growing with an incredible high speed. Every day comes new technologies and give us more access and opportunities in work and life.

    One of the most important branches is small cells and similar product families.

    It extends from a simple telegraph codes to 3G W-CDMA and 4G LTE networks.

    It offers mobile network operators a cost-effective alternative to macro-only deployments for meeting growing coverage and capacity demands.

    Making products and bring it to market is one part of the job. It is important that product be fault free and reliable. Due to this comes our need for test and debugging.

    Test and debugging have high value in massive production.

    This research is subjected to a small cell modem, this modem has different parts like:

    - Download link and upload link through fiber optic cables for CPRI.

    - Network part which include Wi-Fi and LAN.

    - GPS module.

    - eUSB for customization of modem firmware.

    - Com, I2C and JTAG ports for debugging or reprograming the modem.

    We need to develop a debug station to make debugging easier on this modem and having clear compare results. It is important to have a CPRI tester and GPS signal simulator in our debug station.

    Beside all of these we need to make free standalone debug station which save us money and time, and from other side it should be as accurate as possible which make it reliable.

    One of important tests which should get done on test object is Boundary scan in debug station.

    Debuggers mentioned that it is hard to stop the test process in each level and from other side it is hard to find the faults with pass/fail results.

    In this project we try to implement all necessary tests in one and same debug station.

    Debuggers use separate stations for function test and boundary scan test and eUSB programing, with help of this debug station we have all of these 3 main tests in same station and debugger can work independently to repair the boards without interfering in production process or waiting to get time to use function test station or boundary scan tester .

    One of the Results is saving time from debugger’s side and this is more effective for company to save money and give faster and better repair service.

    We should use calibrated and the most accurate tools for testing to get best result. 

  • 90.
    Jozko, Mateusz
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Rykaczewski, Jaroslaw
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Tupaj, Maciej
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Integration of an industrial robot and a CNC machine in waterjet cutting application.2014Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    The main goal of this work is to create a flexible manufacturing system for the waterjet cutting application. This kind of process is a high-risk activity with possible injuries if details are removed manually. To avoid this problem, a system can be fully automatized excluding presence of human interaction. Moreover, it could possibly decrease the total operating time for waterjet cutting of multiple details from one sheet of material, by removing details automatically from the waterjet cutting machine. This aim was achieved by establishing a flexible manufacturing system, which ensures coordination of a robot and a waterjet machine during the process. The developed system combines a computer numerically controlled waterjet machine and the ABB IRB 2600 Robot; both supervised by the Siemens SINUMERIK 840D sl. A full cooperation strategy was designed and implemented i.e. a control algorithm, a communication using an industrial network and safety issues. The experiments were executed, where validating the quality of the designed system for different scenarios including a real scenario from the industry. The project was done in Swedish Waterjet Lab in cooperation with KMT Robotic Solutions and Water Jet Sweden AB.

  • 91.
    Jung, Agata
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Comparison of Video Quality Assessment Methods2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Context: The newest standard in video coding High Efficiency Video Coding (HEVC) should have an appropriate coder to fully use its potential. There are a lot of video quality assessment methods. These methods are necessary to establish the quality of the video.

    Objectives: This thesis is a comparison of video quality assessment methods. Objective is to find out which objective method is the most similar to the subjective method. Videos used in tests are encoded in the H.265/HEVC standard.

    Methods: For testing MSE, PSNR, SSIM methods there is special software created in MATLAB. For VQM method downloaded software was used for testing.

    Results and conclusions: For videos watched on mobile device: PSNR is the most similar to subjective metric. However for videos watched on television screen: VQM is the most similar to subjective metric.

    Keywords: Video Quality Assessment, Video Quality Prediction, Video Compression, Video Quality Metrics

  • 92.
    Jyothula, Urmila
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance Evaluation of Multicast Behavior in Congested Networks2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Compuverde’s software-defined storage product uses multicast for the communication between servers in a cluster. The product makes use of IP UDP multicast for sending status messages between the servers that forms the storage cluster. The storage clusters capacity and performance scales linear to the number of servers in the cluster. The problem is that the multicast traffic also increases with the number of nodes. All nodes send to all other nodes in the cluster. In this document, we present a proposal on evaluation of IP multicast behavior in a network congested with traffic similar to that produced by Compuverde’s product. IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. In order to provide an efficient, timely, and global many-to-many distribution of data, and as such may become the broadcast medium of choice in the future, IP multicasting is used[1]. The main benefit of IP Multicast is that it reduces the bandwidth consumption when data from a sender must reach multiple receivers. We are interested in studying the effects on the network when we send multicast packets at a rate closed to the operational limit of the switch. To be able to study this behavior at larger scale Compuverde’s will provide a cluster with 48 servers all connected to the same switch. In addition, we will compare the behavior of IPv4 multicast traffic to that of IPv6.

    Aims and Objectives: Our aim of my thesis is mainly to focus on IP multicast and compare the IPv4 multicast performance results to the results from IPv6 multicast. In addition, a C++ tool for generating multicast traffic will be developed on Linux. A detailed study on IP multicast (IPv4, IPv6). Detailed study on the design and efficient implementation of a multicast traffic generating tool. Detailed study on the switch that will be used in the project. Additional switches may be provided by BTH. Detailed study on the pattern of dropped packets when traffic rate approaches operational limit and other related impairments on QoS metrics (e.g., CPU utilization).

    Methods: The method is to develop a tool that will generate multicast load towards servers in a cluster. The data sent as multicast packets shall consist of information that will make it possible to detect packet loss on the receiving servers if the network gets congested. The first version of the tool shall use existing socket classes that are based on the IPv4 protocol and shall be written in C++. The tool shall be able to run in two modes at the same time: client mode and server mode. The server part of the tool shall subscribe to a predefined multicast address and receive incoming multicast packages. The client part of the tool shall send data packages to the same predefined multicast address at a configurable rate that will increase over time. The data in the packet that will be sent shall be constructed in a way that lets the receiver (server) detect if a packet is lost in transmission. The load should start small with a small number of servers in the cluster, and then in steps scale up the number of servers, until a maximum of 48 servers is reached. The rate that the multicast packets is sent should also be increased, until the switch gets overloaded and starts to drop packets. The pattern of how packets are dropped should be observed. For example such as, if it is biggerlarge chunks of packets that get dropped or if it is every second packet that gets dropped. The second version of the tool shall support IPv6 multicast. The second round of tests should be performed in a way that makes them comparable to the results from the IPv4 tests so it is possible to draw conclusions if one protocol performs better or is more reliable.

    Result: The maximum number of IPv4 packets a switch can handle is 140 packets per second. The maximum number of IPv6 packets a switch can handle is 6 packets per second. The CPU utilization is more while multicasting the IPv4 packets than while multicasting IPv6 packets by using switch, 95 Nodes.

    Conclusion: The IPv4 is most efficient protocol than IPv6 protocol while sending the packets at very high data rate. The CPU utilization is more higher for sending with the IPv6 protocol packets than with the IPv4 protocol.

  • 93.
    Kanduri, Srinivasa Rangarajan Mukhesh
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Medapati, Vinay Kumar Reddy
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Evaluation of TDOA based Football Player’s Position Tracking Algorithm using Kalman Filter2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Time Difference Of Arrival (TDOA) based position tracking technique is one of the pinnacles of sports tracking technology. Using radio frequency com-munication, advanced filtering techniques and various computation methods, the position of a moving player in a virtually created sports arena can be iden-tified using MATLAB. It can also be related to player’s movement in real-time.

    For football in particular, this acts as a powerful tool for coaches to enhanceteam performance. Football clubs can use the player tracking data to boosttheir own team strengths and gain insight into their competing teams as well.

    This method helps to improve the success rate of Athletes and clubs by analyz-ing the results, which helps in crafting their tactical and strategic approach to game play. The algorithm can also be used to enhance the viewing experienceof audience in the stadium, as well as broadcast.In this thesis work, a typical football field scenario is assumed and an arrayof base stations (BS) are installed along perimeter of the field equidistantly.The player is attached with a radio transmitter which emits radio frequencythroughout the assigned game time. Using the concept of TDOA, the position estimates of the player are generated and the transmitter is tracked contin-uously by the BS. The position estimates are then fed to the Kalman filter, which filters and smoothens the position estimates of the player between the sample points considered. Different paths of the player as straight line, circu-lar, zig-zag paths in the field are animated and the positions of the player are tracked. Based on the error rate of the player’s estimated position, the perfor-mance of the Kalman filter is evaluated. The Kalman filter’s performance is analyzed by varying the number of sample points.

  • 94.
    Karim, Omair
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Electronic frequency controller2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The project was performed with universal electronics which is based in Karachi Pakistan at

    PRD Lab. Due to the energy crises the industry is switching to alternative power generators.

    The main issue with the maintenance of the generator is the constant failure of the controller

    which has to be imported ,the purpose of this project is to make a cheap efficient Electronic

    Frequency Controller (EFC) that can be used in almost all kinds of generators. The work was

    tested on Multisim and then soldered together. To make it functional the frequency generation

    was converted to voltage which was connected to the controller. The controller was joined

    with the actuator and the actuator opens the amount of fuel needed to run the generator so that

    there is a smooth constant voltage. If we have high frequency from the input like a heavy

    machinery is operational then the actuator will widen its opening and when the frequency is

    low the actuator will open appropriately. The presentation was a successful one but due to

    time deadline few minor adjustment could be made to make it more effective as discussed

    later.

  • 95.
    Karri, Venkata Ramakrishna Reddy
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Manda, Venkata Manoj
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Fingerprint Image Segmentation Using Local Radial Transformations2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    With a considerable increase in technology and need for security, aninterest has been created in the development of biometric technology.Various personal identification techniques like face recognition, voicerecognition, retinal pattern and fingerprint recognition are in existence.Among all the available techniques, fingerprint recognition isthe best personal identification method, since each person has a uniquefingerprint pattern. Fingerprint image segmentation is a part of preprocessingfor fingerprint image recognition. Segmentation separatesthe foreground part of the fingerprint image from its background part.In this thesis, fingerprint segmentation is implemented using a localradial transformation technique. Here we analyze the data sampled ina circle with a certain radius around each pixel. The circularly sampleddata of image yields a data vector per each image pixel. Fromthis sampled data vector of pixels, the points of interest of the foregroundare obtained. A mask is created by thresholding the points ofinterest we obtained and the fingerprint image is segmented using theobtained mask.This process is carried out on the available databases of fingerprintimages and the obtained results are compared using NIST database.The performance matching is shown using the NIST matching software.

  • 96.
    Kateiva, Donatas
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Duran, Eray
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    USB Communication On STM32F4052015Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    The goal of this thesis work is to test the High Speed USB 2.0 communication between a custom board and a PC. Baltic Engineering AB has developed a hardware platform based on a microcontroller from ST microelectronics. The microcontroller STM32F405 is equipped with many peripheral functions, one of which is a High Speed USB 2.0 OTG unit. Baltic Engineering AB is planning to use this function in future projects but at the moment they have no experience of implementing software code for this type of communication link. The work is focused on programming and establishing the connection between the PC and the microcontroller. It is explained how to set up the development environment with CooCox CoIDE and how to write programs in C programming language with the help of the libusb library. The outcome of the project was a successful establishment of the USB FS communication. Furthermore, a bulk transfer was benchmarked and reached the bandwidth of approximately 2~Mb/s.

  • 97.
    Katireddy, Harshitha Reddy
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Sidda, Sreemanth
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    A Novel Shoeprint Enhancement method for Forensic Evidence Using Sparse Representation method.2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Shoeprints are often recovered at crime scenes and are the most abundant form of evidence at a crime scene, and in some cases, it is proved to be as accurate as fingerprints. The basis for shoeprint impression evidence is determining the source of a shoeprint impression recovered from a crime scene. This shoeprint evidence collected are often noisy and unclear. To obtain a clear image, the shoeprint evidence should be enhanced by de-noising and improving the quality of the picture.

    In the thesis, we introduced a novel shoeprint enhancement algorithm based on sparse representation for obtaining the complete dictionary from a set of shoeprint patches which allows us to represent them as a sparse linear combination of dictionary atoms. In the proposed algorithm, we first pre-process the image by SMQT method, and then Daubechies first level DWT is applied. The SVD of the image is computed, and Inverse Discrete Wavelet Transform(IDWT) is applied. To the singular value decomposed image, l1-norm minimization sparse representation employed by the K-SVD algorithm is computed where the image is divided into predefined shoeprint image patches of size 8 by 8. Shoeprint images of three different databases with different image quality are tested.

    The performance of the algorithm is assessed by comparing the original shoeprint image and the image obtained after proposed algorithm based on objective and subjective parameters like PSNR, MSE, and MOS. The results show the proposed method gives better performance in terms of contrast (Variance) and brightness (Mean). Finally, as a conclusion, we state that the proposed algorithm enhances the image better than the existing method DWT-SVD.

     

     

  • 98.
    Khabrana, Ahmed
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Ageeli, Jaber
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Producing Electricity in Power Plant2015Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    Abstract This Bachelor thesis has been written at the Blekinge Institute of Technology. The thesis describes electricity production in Shoaiba Steam Power plant in Saudi Arabia. Shoaiba Power Plant is located 100 km South of Jeddah city in Saudi Arabia. Total power production ability reaches 4400 MW. Shoaiba Power Plant has two stages and is constructed with 11 units, each unit produces 400 MW at line voltage 24 kV and line current 16 kA. Main pieces of equipment and their function in the station are as follows: A Steam Generator (boiler), produces steam by burning natural gas or crude oil in the furnace. The steam is superheated and is passed into a steam turbine, which converts the thermal energy of the steam into mechanical power, in form of rotary motion. The turbine drives a generator, which converts the rotary energy of the turbine into electric power. Steam generator, steam turbine and electrical generator are components that are described in the thesis. When the flow of steam to the turbine is controlled, then the amount of thermal energy that changes to mechanical energy in the steam turbine is controlled. The electrical generator is where the final energy conversion takes place. The mechanical energy from the turbine is converted by the generator into electrical energy, which is transmitted to the service area by help of electrical transmission lines. The plant cycle is an essential part of the energy flow path. Without the plant cycle, the conversion of thermal energy into mechanical energy would not occur, The plant cycle is a closed loop that allows the same water to be used over and over again. Always, the power plants are situated far from residential areas and located outside cities and close to the sea, because the steam is produced from seawater. The advantages of the steam power stations are as follows: They can produce high amounts of electrical energy from small amounts of fuel. They have low initial costs, obstetrics and maintenance costs are not high, and the stations do not need much space to be built and they have usually high capacity. The disadvantages of steam stations are the following: They cause environmental pollution, they have low efficiency, and require very big quantities of cooling water, and the stations must be built away from populated areas.

  • 99.
    Khan, Imran
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Measurements, Analysis Techniques and Experiments in Sound and Vibration: Applied to Operational MRI Scanners and in Remote Laboratories.2017Doktoravhandling, med artikler (Annet vitenskapelig)
    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.

  • 100.
    Khan, Imran
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Claesson, Lena
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performing active noise control and acoustic experiments using real test setup via the Internet2016Inngår i: Proceedings of 2016 13th International Conference on Remote Engineering and Virtual Instrumentation, REV 2016, IEEE Press, 2016, s. 375-376Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In In this demo session, it will be shown how to perform Active Noise Control (ANC) and various important Acoustic experiments remotely on the remotely controlled ANC laboratory developed by Blekinge Institute of Technology, Sweden. An important consideration in ANC is the active control’s performance dependence on the spatial position of the reference and error sensors, etc. This will be highlighted particularly. This feature is recently implemented using stepper motors which can be controlled via the Internet. It will be demonstrated how to write and upload active noise control algorithms e.g. Filtered-X Least Mean Square (FXLMS) to a digital signal processors (DSP) board. For the acoustic experiments various interesting acoustic properties such as waveforms, speed of sound, mode shapes and sound pressure spectra may be measured. A short guide about the measurements and PowerPoint presentation will be provided during the demo to facilitate for the users. The Lab setup and the equipment will be shown to the user using Skype and a web camera.

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