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  • 101.
    Khan, Imran
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Maciej, Z.
    Konopka, P.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    REMOTE CONTROL OF ACTIVE NOISECONTROL AND AOCUSTICS EXPERIMENT SETUP VIA THE INTERNET2014Konferansepaper (Annet vitenskapelig)
  • 102.
    Khan, Imran
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nygren, Åse
    Blekinge Tekniska Högskola, Enheten för utbildningsutveckling.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    CHALLENGES IN FULFILLING THE INTENDED LEARNING OUTCOMES OF REMOTE LABORATORIES: A CASE STUDY OF ACTIVE NOISE CONTROL AND ACOUSTIC REMOTE LABORATORY.2015Inngår i: PROCEEDINGS OF THE 22ND INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: MAJOR CHALLENGES IN ACOUSTICS, NOISE AND VIBRATION RESEARCH, 2015 / [ed] Crocker, MJ Pawelczyk, M Pedrielli, F Carletti, E Luzzi, S, INT INST ACOUSTICS & VIBRATION , 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The learning outcomes or educational objectives (goals) of a remote controlled laboratory via the Internet is the subject of discussion in this paper. The developers of remote laboratories are often self motivated individuals or academic groups, who only focus on development, accessibility and usability of their laboratories. The key question i.e. the intended learning outcomes or educational goals of a remotely controlled laboratory are frequently ignored or simply not given enough priority to be considered. This may lead to under utilization or complete failure of a particular remote laboratory. In this paper the challenges in formulating and achieving the educational objectives of a remotely controlled active noise control and acoustics laboratory are discussed.

  • 103.
    Khan, Imran
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Zmuda, M.
    Konopka, P.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Enhancement of remotely controlled laboratory for Active Noise Control and acoustic experiments2014Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The latest important developments in the remotely controlled Active Noise Control (ANC) and Acoustics laboratory at Blekinge Institute of Technology (BTH), Sweden, are introduced. The remotely controlled laboratory is based on the Virtual Instruments Systems in Reality (VISIR) concept, and concerns multi-channel measurement and control of the sound field in a heating ventilation and air conditioning (HVAC) duct. Originally the ventilation duct was equipped with a fixed number of microphones at fixed spatial locations in the duct. A microphone positioning system has been designed and implemented. It enables control of the spatial positions of a number of microphones inside the HVAC duct using a suitable web interface for controlling stepper motors via a National Instruments (NI) PXI system. With the new developments, the spatial number of selectable positions for the microphones have been extended substantially. The new microphone positioning control system is presented and to enhance the user interaction with the laboratory equipment, an audio and visual system is also proposed.

  • 104.
    Kodide, Alekhya
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance Analysis of a Cooperative Communication Network Over κ - μ Shadowed Fading for Different Relaying Protocols2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    With the fast development of today’s multimedia services, engineers face a huge hurdle that is, the overwhelming need of highly reliable communication over long distances. Cooperative communication is a novel concept which tackles this problem effectively. The direct link is assisted by nodes called relays, which also reduce shadowing and pathloss effects in wireless networks. An added advantage of such a cooperative communication network is that when combined with multiple-input multiple-output (MIMO) antenna systems and cognitive radio networks (CRN), the system performance in terms of spectral efficiency and reliability, can be extremely enhanced without any extra power and spectrum.The concept of cooperative communications in MIMO and CRN systems has gained immense interest in the literature. Most of the research works have assumed Rayleigh fading conditions. In this thesis, the performance of cooperative communications with practical constraints of shadowing is studied. Analytical expressions for the outage probability of cooperative networks under different relaying protocols with selection combining are presented under the assumption of κ − µ shadowing fading. Specifically, the relaying protocols that are investigated are incremental relaying, opportunistic relaying, adaptive amplify-and-forward and decode-and-forward. Furthermore, this system model is simulated and the simulation results are compared with the analytical results. Mathematica, a technical computing tool, is used for numerical estimations using stochastic processes and probability theory. Simulation is done in MATLAB.In this thesis, along with the analytical framework for evaluating outage probability for the system is presented. Simulations are performed for various fading parameters and the results closely match with analytical results which validate the derivations.

  • 105.
    Kodide, Alekhya
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Chu, Thi My Chinh
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kreativa teknologier.
    Zepernick, Hans-Jürgen
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Outage probability of multiple relay networks over kappa-mu Shadowed fading2016Inngår i: 2016, 10th International Conference on Signal Processing and Communication Systems, ICSPCS 2016 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper, we study the outage probability of an opportunistic multiple relay communication system over κ-μ shadowed fading channels for both amplify-and-forward and decode-and-forward relaying protocols. We first provide an exact analysis of the impact of κ-μ shadowed fading on the outage probability of the system. To simplify the obtained analytical expression of the outage probability, we further approximate the κ-μ, shadowed fading channel by a Nakagami-m fading model. In order to illustrate the suitability of the approximation, numerical results are provided revealing that the exact outage probability using κ-μ, shadowed fading and the results obtained by approximating the fading by the Nakagami-m fading model match well as long as the parameters of the shadowed fading translate to integer values of the fading severity parameter m. Further, Monte-Carlo simulations have been conducted to validate the derived analytical expressions of the outage probability. Finally, the effect of network parameters such as the average transmit power at the source and the relay, the impact of the number of relays, the influence of the transmission distances and the fading parameters on the outage probability of the considered system is also illustrated through numerical examples. © 2016 IEEE.

  • 106.
    Kolachina, Srinivasa Kranthi Kiran
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Reddy, Nishu
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Modelling and Simulation of a Resonant Converter2014Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    This thesis is a part of collaborated project between Alstom and Blekinge Institute of Technology. In this thesis a fifth order non- linear Hamilton observer is applied on a series resonant converter. Two models for individual modes are given for a resonant power converter, one is suitable for simulation and other is suitable for simulation and analysis. The circuit is run in eight modes. A switched model of a fifth order DC/DC converter consisting of eight different switching modes has been derived and the performance of the circuit is studied under several conditions by simulation.

  • 107.
    Kondapalli, Durga Sri Mouli
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Kadali, Sesha Sai Shashikanth
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Beamforming and Antenna Grouping for MIMO MRT-MRC System Under Co-Channel Interference2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
  • 108.
    Korziuk, Kamil
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Podbielski, Tomasz
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Engineering Requirements for platform, integrating health data2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In the world that we already live people are more and more on the run and population ageing significantly raise, new technologies are trying to bring best they can to meet humans’ expectations. Survey’s results, that was done during technology conference with elderly on Blekinge Institute of Technology showed, that no one of them has any kind of help in their home but they would need it. This Master thesis present human health state monitoring to focus on fall detection. Health care systems will not completely stop cases when humans are falling down, but further studying causes can prevent them.In this thesis, integration of sensors for vital parameters measurements, human position and measured data evaluation are presented. This thesis is based on specific technologies compatible with Arduino Uno and Arduino Mega microcontrollers, measure sensors and data exchange between data base, MATLAB/Simulink and web page. Sensors integrated in one common system bring possibility to examine the patient health state and call aid assistance in case of health decline or serious injury risk.System efficiency was based on many series of measurement. First phase a comparison between different filter was carried out to choose one with best performance. Kalman filtering and trim parameter for accelerometer was used to gain satisfying results and the final human fall detection algorithm. Acquired measurement and data evaluation showed that Kalmar filtering allow to reach high performance and give the most reliable results. In the second phase sensor placement was tested. Collected data showed that human fall detection is correctly recognized by system with high accuracy. Designed system as a result allow to measure human health and vital state like: temperature, heartbeat, position and activity. Additionally, system gives online overview possibility with actual health state, historical data and IP camera preview when alarm was raised after bad health condition.

  • 109.
    Kotha, Aravind Eswar Ravi Raja
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Majety, Lakshmi Ratna Hima Rajitha
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance Comparison of Image Enhancement Algorithms Evaluated on Poor Quality Images2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Many applications require automatic image analysis for different quality of the input images. In many cases, the quality of acquired images is suitable for the purpose of the application. However, in some cases the quality of the acquired image has to be modified according to needs of a specific application. A higher quality of the image can be achieved by Image Enhancement (IE) algorithms. The choice of IE technique is challenging as this choice varies with the application purpose. The goal of this research is to investigate the possibility of the selective application for the IE algorithms. The values of entropy and Peak Signal to Noise Ratio (PSNR) of the acquired image are considered as parameters for selectivity. Three algorithms such as Retinex, Bilateral filter and Bilateral tone adjustment have been chosen as IE techniques for evaluation in this work. Entropy and PSNR are used for the performance evaluation of selected IE algorithms. In this study, we considered the images from three fingerprint image databases as input images to investigate the algorithms. The decision to enhance an image in these databases by the considered algorithms is based on the empirically evaluated entropy and PSNR thresholds. Automatic Fingerprint Identification System (AFIS) has been selected as the application of interest. The evaluation results show that the performance of the investigated IE algorithms affects significantly the performance of AFIS. The second conclusion is that entropy and PSNR might be considered as indicators for required IE of the input image for AFIS.

  • 110.
    Koutrouli, Eleni
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Low Complexity Beamformer structures for application in Hearing Aids2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Background noise is particularly damaging to speech intelligibility for people with hearing loss. The problem of reducing noise in hearing aids is one of great importance and great difficulty. Over the years, many solutions and different algorithms have been implemented in order to provide the optimal solution to the problem.

    Beamforming has been used for a long time and has therefore been extensively researched. Studying the performance of Minimum Variance Distortionless Response (MVDR) beamforming with a three- and four- microphone array compared to the conventional two-microphone array, the aim is to implement a speech signal enhancement and a noise reduction algorithm. By using multiple microphones, it is possible to achieve spatial selectivity, which is the ability to select certain signals based on the angle of incidence, and improve the performance of noise reduction beamformers.

    This thesis proposes the use of beamforming, an existing technique in order to create a new way to reduce noise transmitted by hearing aids. In order to reduce the complexity of that system, we use hybrid cascades, which are simpler beamformers of two inputs each and connected in series. The configurations that we consider are a three-microphone linear array (monaural beamformer), a three-microphone configuration with a two-microphone linear array and the 3rd microphone in the ear (monaural beamformer), a three-microphone configuration with a two-microphone linear array and the 3rd microphone on contra-lateral ear (binaural beamformer), and finally four-microphone configurations.

    We also investigate the performance improvement of the beamformer with more than two microphones for the different configurations, against the two-microphone beamformer reference. This can be measured by using objective measurements, such as the amount of noise suppression, target energy loss, output SNR, speech intelligibility index and speech quality evaluation. These objective measurements are good indicators of subjective performance. In this project, we prove that most hybrid structures can perform satisfyingly well compared to the full complexity beamformer.

    The low complexity beamformer is designed with a fixed target location (azimuth), where its weights are calibrated with respect to a target signal located in front of the listener and for a diffuse noise field. Both second- and third- order beamformers are tested in different acoustic scenarios, such as a car environment, a meeting room, a party occasion and a restaurant place. In those scenarios, the target signal is not arriving at the hearing aid directly from the front side of the listener and the noise field is not always diffuse. We thoroughly investigate what are the performance limitations in that case and how well the different cascades can perform. It is proven that there are some very critical factors, which can affect the performance of the fixed beamformer, concerning all the hybrid structures that were examined.

    Finally, we show that lower complexity cascades for both second- and third- order beamformers can perform similarly well as the full complexity beamformers when tested for a set of multiple Head Related Transfer Functions (HRTFs) that correspond to a real head shape.

  • 111.
    Kulesza, Wlodek J.
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Jachimczyk, Bartosz
    Dziak, Damian
    E-Technologies in teaching research methodology for engineers – a case study of the course for international postgraduate students2014Inngår i: The Scientific Papers of Faculty of Electrical and Control Engineering Gdańsk University of Technology, ISSN 1425-5766, nr 27, s. 27-32Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Research Methodology course for postgraduate students is challenging, even for an experienced academic teacher. The primary objective of this course is to prepare participants to conduct scientific research and publish the results. This case study presents an original teaching method applied to Research Methodology with Emphasis on Engineering Science, for international engineering students at Blekinge Institute of Technology in Karlskrona, Sweden. The demanding requirements of the course, a varying number of enrolled students, and a large number of assignments which need to be tracked and guided by the teacher are all conditions that need a custom approach and modern tools. The opportunities offered by e-technologies help to fulfil these course requirements. This article shows how e-tools such Itslearning, Doodle, Zotero or scientific database search engines, can be implemented to support the teaching objectives. Using these tools, a single academic teacher can accomplish the eight-week course of Research Methodology, for up to 180 students working in 60 project groups without compromising teaching quality and students’ satisfaction. The course also has been appreciated by colleagues and mentioned in the Master program evaluation of the Swedish Higher Education Authority.

  • 112.
    Källström, Elisabeth
    et al.
    Luleå Technical University/Volvo CE.
    Lindström, John
    Luleå Technical University.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Karlberg, Magnus
    Luleå Technical University.
    Lundin, J.
    Svensson, M.
    Larsson, J.
    ANALYSIS OF AUTOMATIC TRANSMISSION VIBRATION FOR CLUTCH SLIPPAGE DETECTION2015Inngår i: PROCEEDINGS OF THE 22ND INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: MAJOR CHALLENGES IN ACOUSTICS, NOISE AND VIBRATION RESEARCH, 2015 / [ed] Crocker, MJ; Pawelczyk, M; Pedrielli, F; Carletti, E; Luzzi, S, INT INST ACOUSTICS & VIBRATION, AUBURN UNIV , 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Heavy duty construction equipment is generally equipped with automatic transmission enabling to change gear ratio automatically. The clutches in an automatic transmission transfer torque from the engine to the gearbox and clutch failures may result in costly downtime of construction equipment. To prevent costly downtime of construction equipment, condition monitoring in combination with condition based maintenance may be utilized. Different sensor data are collected on a machine that enables condition monitoring. Vibration have been measured on an automatic transmission in a construction equipment machine during controlled driving sessions, with and without clutch slippage, on a test track. An initial investigation of the vibration measured on the automatic transmission have been carried out with the purpose to find out if the vibration may contain reliable information related to clutch slippage considered to be abnormal. Initial signal analysis of the data have been carried out using Spectrogram and Spectral Kurtosis methods. The results indicate that information related to abnormal clutch slippage may be extracted from vibration measured on an automatic transmission in a construction equipment machine.

  • 113.
    Källström, Elisabeth
    et al.
    Volvo, SWE.
    Lindström, John
    Luleå tekniska Universitet, SWE.
    Lars, Håkansson
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Karlberg, Magnus
    Luleå tekniska Universitet, SWE.
    Öberg, Olof
    Volvo, SWE.
    Renderstedt, Reza
    Volvo, SWE.
    Larsson, Jonas
    Volvo, SWE.
    Identification of vibration properties of heavy duty machine driveline parts as a base for adequate condition monitoring: Torque converter2016Inngår i: ICSV 2016 - 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]

    Improving uptime is paramount in the heavy duty construction equipment business. Failure of critical components in the heavy duty machine may lead to unnecessary stops and expensive downtime. The torque converter, a complex component of the driveline, transmits and multiplies torque from the engine to the gearbox, and its failure may not only lead to the machine standing still but may also lead to damage of other parts of the automatic transmission. For adequate condition monitoring of the torque converter, different sensor data are measured on a construction equipment machine during controlled driving sessions. Vibration has been measured on the torque converter. An initial investigation of the vibration measured on the torque converter has been carried out to identify its vibration properties in order to enable its health monitoring to prevent failure. Initial signal analysis of the data have been carried out using Order Power Spectrum and Order Modulation Spectrum methods. The results indicate that the torque converter vibration properties contain information relevant for early fault detection.

  • 114.
    Källström, Elisabeth
    et al.
    Lulea tekniska Universitet, SWE.
    Olsson, Tomas
    RISE SICS, SWE.
    Lindström, John
    Lulea tekniska Universitet, SWE.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Larsson, Jonas
    Volvo, SWE.
    On-board clutch slippage detection and diagnosis in heavy duty machine2018Inngår i: International Journal of Prognostics and Health Management, ISSN 2153-2648, E-ISSN 2153-2648, Vol. 9, nr 1, artikkel-id 007Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In order to reduce unnecessary stops and expensive downtime originating from clutch failure of construction equipment machines; adequate real time sensor data measured on the machine in combination with feature extraction and classification methods may be utilized. This paper presents a framework with feature extraction methods and an anomaly detection module combined with Case-Based Reasoning (CBR) for on-board clutch slippage detection and diagnosis in heavy duty equipment. The feature extraction methods used are Moving Average Square Value Filtering (MASVF) and a measure of the fourth order statistical properties of the signals implemented as continuous queries over data streams. The anomaly detection module has two components, the Gaussian Mixture Model (GMM) and the Logistics Regression classifier. CBR is a learning approach that classifies faults by creating a new solution for a new fault case from the solution of the previous fault cases. Through use of a data stream management system and continuous queries (CQs), the anomaly detection module continuously waits for a clutch slippage event detected by the feature extraction methods, the query returns a set of features, which activates the anomaly detection module. The first component of the anomaly detection module trains a GMM to extracted features while the second component uses a Logistic Regression classifier for classifying normal and anomalous data. When an anomaly is detected, the Case-Based diagnosis module is activated for fault severity estimation. © 2018, Prognostics and Health Management Society. All rights reserved.

  • 115.
    Lakum, Vamshi Krishna
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Gubbala, Arshini
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Detection of Emergency Signal in Hearing Aids using Neural Networks2014Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    ABSTRACT The detection of an emergency signal can be estimated by the cancellation of surrounding noise and achieving the desired signal in order to alert the automobilist. The aim of the thesis is to detect the emergency signal arriving nearer to the automobilist carrying hearing aids. Recent studies show that this can be achieved by designing various kinds of fixed and adaptive beam formers. A beam former does spatial filtering in the sense that it separates two signals with overlapping frequency content originating from distinctive directions. In this contribution, robust beam former namely Wiener beam former is designed and analyzed collaboratively in a group under the consideration of hearing aid constraints such as the microphone distance. A fractionally delay (FD) are designed to get a maximally flat group delay. The studies had been carried out by comparing noise cancellation algorithms like LMS, NLMS, LLMS and RLS algorithms. By comparing Omni-directional and multi-directional microphones the SNR can be studied. In this thesis work, first proposing appropriate microphone array setup with improved beam forming techniques by using required adaptive algorithm (NLMS) in order to get better quality using the Microphone arrays. Microphone arrays have been widely used to improve the performance of speech recognition systems as well as to benefit for people who need hearing aids. With the help of microphone arrays, it can choose to focus on signals from a specific direction. To getting better signal quality in microphone array using adaptive algorithms, these are help in the noise suppression in accordance with the different beam forming techniques. The proposed system is implemented successfully and validated using MATLAB simulation tool. The emergency signal is different in different countries, so we identify any type of emergency signal by training through neural networks.

  • 116.
    Liang, Xusheng
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Tanyi, Elvis
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Zou, Xin
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Charging electric cars from solar energy2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Before vehicles were heavily relied on coal, fossil fuels and wind for power.  Now, they are rapidly being replaced by electric vehicles and or plug-in hybrid electric cars. But these electric cars are still faced with the problem of energy availability because they rely on energy from biomass, hydro power and wind turbines for power generation. The abundance of solar radiation and its use as solar energy as a power source in driving these rapidly increasing electric cars is not only an important decision but also a necessary condition for eradication of environmental pollution.

    This study presents a model for charging electric cars from solar energy. Little focus on detailed technologies involved from solar energy capture to battery charging but our main focus is how to provide a modified charging parking lot in Karlskrona city-Sweden. With a surface area of 2850m2, we were able to choose 1STH-350-WH as the right PV modules. Based on the latitude of our design area, a computed 71 degrees angle positioning between solar panel and roof so as to maximise the surface area and optimise the solar irradiance gathering. Based on the power output of approximately116kW these PV modules generated, we further analysed and selected SDP 30KW inverter and Monocrystalline Silicon (1SolTech 1STH-350-WH (350W) solar modules. Also we provide different car charging method by choosing the SAE J1772 standard as one of specifications for dedicated vehicle charging and Clipper Creek HSC-40 as our option of charger. With the data of the generating solar energy every day, charging time, consuming power, we can estimate how many cars the system can handle to charge. Moreover, our system provides AC power from AC power network by general socket type F.

    We finally concluded that, our model for charging of electric car batteries was not only supportive but efficient in terms of extracting solar energy from sunlight to charge electric cars, thus making the region an eco-friendly place.

  • 117. Lima, N.
    et al.
    Alves, G.
    Viegas, C.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Combined efforts to develop students experimental competences2015Inngår i: exp.at 2015 - 3rd Experiment International Conference: Online Experimentation, IEEE Press, 2015, s. 243-248Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Students experimental competences are of most importance in engineering courses. However in post-Bologna courses, the number of contact hours and the actual extent of hands-on lab work were substantially reduced. Online resources usage (simulators and remote labs) has been growing up in the last decades, as more complex and versatile tools are being developed. Unfortunately, several of these usages reported in literature do not show the didactical backing that support these implementations. This work is a step forward, explaining how a teacher implemented a combination of online resources in order to develop experimental competences. The results show significant correlations between students’ usage of these resources and their calculus competences and final achievements.

  • 118.
    Lima, Natercia
    et al.
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Viegas, Maria Clara
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Zannin, Marcelo
    Universidade Federal de Santa Catarina, BRA.
    Marques, Arcelina
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Alves, Gustavo
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Felgueiras, Carlos
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Costa, Ricardo
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Fidalgo, André
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Marchisio, Susana
    Universidad Nacional de Rosario, ARG.
    Lerro, Federico
    Universidad Nacional de Rosario, ARG .
    Merendino, Claudio
    Universidad Nacional de Rosario, ARG.
    Da Silva, Juarez
    Universidade Federal de Santa Catarina, BRA.
    Pozzo, Maria Isabel
    Consejo Nacional de Investigaciones Cientificas y Tecnicas, ARG.
    Dobboletta, Elsa
    Consejo Nacional de Investigaciones Cientificas y Tecnicas, ARG.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nilsson, Kristian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Garcia-Peñalvo, Francisco
    Universidad de Salamanca, ESP.
    Do students really understand the difference between simulation and remote labs?2017Inngår i: ACM International Conference Proceeding Series, Association for Computing Machinery , 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Laboratory experiments play a crucial role in engineering education as they strongly contribute to the development of important skills for the professional practice. This paper addresses a students' understanding gap between simulations and remote labs. These two resources (and namely the remote laboratory VISIR - Virtual Instrument Systems in Reality) have been commonly used on several didactical implementations, along with other didactical resources in different Engineering degrees at the Federal University of Santa Catarina and Polytechnic of Porto School of Engineering. This work, developed in the scope of the VISIR+ Project, intends to evaluate students' perceptions considering simulation and remote lab results. Quantitative and qualitative data were analyzed to better understand how deeply students realize the differences between these resources and their type of data. Preliminary results indicate that a considerable number of student's don't have a clear idea of these differences, even though sometimes they know their definition. Furthermore, this gap does not seem to differ much with the context (country, course, academic year, course content), students' final grades, teacher approach or implemented tasks. © 2017 Association for Computing Machinery.

  • 119.
    Lima, Natercia
    et al.
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Zannin, Marcelo
    Universidade Federal de Santa Catarina, BRA.
    Viegas, Clara
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Marques, Arcelina
    IPP, Felgueiras, PRT.
    Alves, Gustavo
    IPP, Felgueiras, PRT.
    Felgueiras, Carlos
    Research Centre in Industrial Technology and Engineering (CIETI), PRT.
    Costa, Ricardo
    Instituto Politcnico do Porto, School of Engineering (ISEP), PRT.
    Fidalgo, André
    IPP, Felgueiras, PRT.
    Da Silva, Juarez
    Universidade Federal de Santa Catarina, BRA.
    Pozzo, Maria Isabel
    Consejo Nacional de Investigaciones Cientificas y Tecnicas, ARG.
    Dobboletta, Elsa
    Consejo Nacional de Investigaciones Cientificas y Tecnicas, ARG.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Garcia-Peñalvo, Francisco
    Universidad de Salamanca, ESP.
    The VISIR+ project-helping contextualize math in an engineering course2017Inngår i: Proceedings of 2017 4th Experiment at International Conference: Online Experimentation, exp.at 2017, Institute of Electrical and Electronics Engineers Inc. , 2017, s. 7-12Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The long-term goal of engineering education is to prepare students to work as engineers. Being a practical profession, laboratories play a crucial role in illustrating concepts and principles as well as improving technical skills. In the last decades the use of online resources (simulators and remote labs) has been growing, either as a complementary and/or as an alternative way of developing experimental competences. In the scope of the VISIR+ Project, this work presents the first results of a didactical implementation using simultaneously the remote laboratory VISIR (Virtual Instrument Systems in Reality), simulation and calculus in a Math Course at the Federal University of Santa Catarina (UFSC). The preliminary results indicate that the use of several resources increases students' performance, boosting their learning and competence development. © 2017 IEEE.

  • 120.
    Lima, Natercia
    et al.
    Res Ctr Ind Technol & Engn CIETI, PRT.
    Zannin, Marcelo
    Fed Univ Santa Catarina UFSC, BRA.
    Viegas, Clara
    Res Ctr Ind Technol & Engn CIETI, PRT.
    Marques, Arcelina
    Res Ctr Ind Technol & Engn CIETI, PRT.
    Alves, Gustavo
    Res Ctr Ind Technol & Engn CIETI, PRT.
    Felgueiras, Manuel C.
    Res Ctr Ind Technol & Engn CIETI, PRT.
    Costa, Ricardo
    Res Ctr Ind Technol & Engn CIETI, PRT.
    Fidalgo, Andre
    Res Ctr Ind Technol & Engn CIETI, PRT.
    da Silva, Juarez B.
    Fed Univ Santa Catarina UFSC, BRA.
    Pozzo, Maria I.
    Consejo Nacl Invest Cient & Tecn, ARG.
    Dobboletta, Elsa
    Consejo Nacl Invest Cient & Tecn, ARG.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Garcia-Penalvo, Francisco
    Univ Salamanca, ESP.
    The VISIR plus Project: Helping Contextualize Math in an Engineering Course2017Inngår i: PROCEEDINGS OF 2017 4TH EXPERIMENT@INTERNATIONAL CONFERENCE (EXP.AT'17), IEEE , 2017, s. 7-12Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The long-term goal of engineering education is to prepare students to work as engineers. Being a practical profession, laboratories play a crucial role in illustrating concepts and principles as well as improving technical skills. In the last decades the use of online resources (simulators and remote labs) has been growing, either as a complementary and/or as an alternative way of developing experimental competences. In the scope of the VISIR+ Project, this work presents the first results of a didactical implementation using simultaneously the remote laboratory VISIR (Virtual Instrument Systems in Reality), simulation and calculus in a Math Course at the Federal University of Santa Catarina (UFSC). The preliminary results indicate that the use of several resources increases students' performance, boosting their learning and competence development.

  • 121.
    Lundberg, Jenny
    et al.
    Linnaeus Univ, SWE..
    Claesson, Lena
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Early Signs of Diabetes Explored from an Engineering Perspective2019Inngår i: Lecture Notes in Networks and Systems / [ed] Auer, ME Langmann, R, SPRINGER INTERNATIONAL PUBLISHING AG , 2019, s. 22-31Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Undetected diabetes is a global issue, estimated to over 200 million persons affected. Engineering opportunities in capturing early signs of diabetes has a potential due to the complexity to interpret early signs and link it to diabetes. Persons with untreated diabetes are doubled in risk of getting cardiovascular diseases and may also suffer other consequent diseases. In Sweden, approximately 450 thousand have diabetes where 80-90% are of type 2 with 1/4 unaware of it, i.e. approx. 100 thousand. Screening approaches, searching specifically for diabetes in persons not showing symptoms has been initiated with positive results. However, some general drawbacks of screening such as false sense of security are an issue. In this publication, we focus upon in home measurements and empowering of the individual in identifying early signs of diabetes. The methods in this publication are to gather data, evaluate and give suggestion if clinical test to confirm or reject diabetes. In home measurements, education process with companies for innovation possibilities.

  • 122.
    Luo, Xiao
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Adaptive Signal Processing for SAR Data: Theory and Experimental Results2014Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    This thesis presents the theory and the experiment results with adaptive filtering algorithms. The experiments are based on the ultrawideband (UWB) Synthetic Aperture Radar (SAR) data. Several algorithms are investigated in this thesis such as Least Mean Square (LMS), Normalized Least Mean Square (NLMS), Leaky Least Mean Square (LLMS) and Recursive Least Square (RLS). First, the theory behind the above algorithms are briefly reviewed. Then, the experiments based on UWB SAR data are carried out. The aim is to design adaptive filters to cancel the unwanted noise present in SAR data as much as possible. The theory and experiments are started with the conventional LMS algorithm that is relatively simple for implementation and eligible to make an evaluation of the performance of the adaptive filter. The investigation is followed by NLMS, LLMS and finally RLS. The results achieved in this study also show that there is a gap between computer simulations and practical applications in applying the adaptive algorithms. For this reason, studies on using the adaptive algorithms for practical applications are still needed and therefore continued in the future.

  • 123.
    López Revuelta, Álvaro
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Orientation estimation and movement recognition using low cost sensors2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Orientation estimation is a very well known topic in many fields such as in aerospace or robotics. However, the sensors used are usually very ex- pensive, heavy and big, which make them not suitable for IoT (Internet of Things) based applications. This thesis presents a study of how different sensor fusion algorithms perform in low cost hardware and in high acceler- ation scenarios. For this purpose, an Arduino MKR1000 is used together with an accelerometer, gyroscope and magnetometer. The objective of the thesis is to choose the most suitable algorithm for the purposed practical application, which consists on attaching the device to a moving object, such as a skate board or a bike. Once the orientation is estimated, a movement recognition algorithm that was developed is able to match what trick or movement was performed. The algorithm chosen was the Madgwick one with some minor adjustments, which uses quaternions for the estimation and is very resilient when the device is under strong external accelerations.

  • 124.
    Machiraju, Naga Kiran
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Semi Automated Bullet GroupAnalysis for Shooting Target Training2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Competitive Shooting as a sport is becoming famous these days and analysis of shooting group or bullet group which is a process of analysis location of bullet holes in one shooting session and stands as a metric for Precision of the weapon, Shooter's Accuracy, his Consistency and helps in finding Accurate load for the Cartridge. Knowledge of these factors can help in improving one's shooting and fine-tuning skills as a Shooter. Bullet group is alsoinuenced by the Accuracy of Rie, Optimal hand load, free run distance, environmental conditions like humidity, temperature, ambient light, windspeed, Shooter's position. Analyzing the Bullet group can be done in various ways, one way of doing it is by taking a Digital Image and analyzing the Image and detecting positions of bullet holes and Calculating metrics from this Metrics like Geometry of bullet group, largest distance between two bullets, compactness of the bullet group on target. In this work, detection of bullet holes is done by using these techniques: Template matching, Histogram equalization, White Balancing, Median andGaussian altering and Peak detection algorithms. After obtaining positions of the bullet holes in the Image. Complete Automation can be done by using the training the Algorithm with a Machine learning framework with the help of Articial neural networks. The existing bullet group analysis software require the bullet group shot on a specifc target, which limits the shooters to shoot on a target of shooter's choice every time and, those targets are not universal and vary from place to place. This algorithm aims to work on various types of target, and taking a step towards making a more generalized and more versatile algorithm.

  • 125.
    Maddukuri, Achyutha Ramarao
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Fractional Fourier Transform and Scaling Problem in Signals and Images2018Independent thesis Advanced level (degree of Master (One Year)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Context: We identify a material or thing that can be seen and touched in the world as having structures at both coarser and finer levels of scale. Scaling problem presents in a branch of science concerned with the description, prediction understanding of natural phenomena and visual arts. A moon, for instance, may appear as having a roughly round shape is much larger than stars when seen from the earth. In the closer look, the moon is much smaller than the stars. The fact that objects in the world appear in different ways depending upon the scale of observation has important implications when analyzing measured data, such as images, with automatic methods [1]. The type of information we are seeking from a one-dimensional signal or two-dimensional image is only possible when we have the right amount of scale for the structure of an image or signal data. In many modern applications, the right scale need not be obvious at all, and we all need a complete mathematical analysis on this scaling problem. This thesis is shown how a mathematical theory is formulated when data or signal is describing at different scales.

    Objectives: The subtle patterns deforming in data that can foretell of a scaling problem? The main objectives of this thesis are to address the dynamic scaling pattern problem in computers and study the different methods, described in the latest issue of Science, are designed to identify the patterns in data.

    Method: The research methodology used in this thesis is the Fractional Fourier Transform. To recognize the pattern for a different level of scale to one or many components, we take the position and size of the object and perform the transform operation in any transform angle and deform the component by changing to another angle which influences the frequency, phase, and magnitude. 

    Results: We show that manipulation of Fractional Fourier transform can be used as a pattern recognition system. The introduced model has the flexibility to encode patterns to both time and frequency domain. We present a detailed structure of a dynamic pattern scaling problem. Furthermore, we show successful recognition results even though one or many components deformed to different levels using one-dimensional and two-dimensional patterns.

    Conclusions: The proposed algorithm FrFT has shown some advantages over traditional FFT due to its competitive performance in studying the pattern changes. This research work investigated that simulating the dynamic pattern scaling problem using FrFT. The Fractional Fourier transform does not do the scaling. Manipulating the Fractional Fourier transform can be helpful in perceiving the pattern changes. We cannot control the deformation but changing the parameters allow us to see what is happening in time and frequency domain.

  • 126.
    Makhalas, Kharsan Al
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Alsehlli, Faisal
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Wind Power2015Oppgave
    Abstract [en]

    This Bachelor thesis has been written at the Blekinge Institute of Technology. This thesis concentrates on the wind power and their components, also the large wind farm is studied. The electrical power is generated by using the power in wind to drive a wind turbine to produce mechanical power. This mechanical power can be converted into electrical power by using electrical induction generators. There are two types of the wind turbines, the horizontal axis and vertical axis wind turbine, where the horizontal axis wind turbine is mostly used and was studied in this thesis. The rotor can be placed in two directions: an upwind rotor where the blade of turbine faces to the wind, so it operates more smoothly and transmit more power. The other type is a downwind rotor which orients itself with respect for the wind direction. Moreover, the tower shadow makes the blade to flex, consequently resulting in fatigue, noise, and reduces output of the power. The modern wind turbine has been built with an odd number of blades which is important for the stability of the turbine. The rotor with an odd number of blades can be considered to be similar to a disc when calculating the dynamic properties of the machine. The main idea of this thesis is to study the wind power in general and large wind parks specifically. The Horns Rev wind park was taken as an example of a wind park in Denmark and the Gotland wind park as an example of a wind park in Sweden too. Into account, the distance between wind turbine in the wind direction cannot be too small. If the wind turbines are located to close to each other, the wind will be more and more turbulent after it passes through each single wind turbine. This would lead to that wind turbines downstream in the wind park, and it might even have to shut down due to that mechanical loading gets to high during strong conditions. This is due to the fact that when wind passes through the rotor of the wind turbine it gets very turbulent and the wind speed is decreased. The minimum length of the rotor should be approximately 5-7 rotor diameters to avoid that issue. Gotland Energy AB (GEAB) considered, that high voltage direct current light would be the only realistic way to solve the technical problems for the high amount of wind power in-feed. One result is that The stability of voltage during transient events, has become much better by using the high voltage direct current light so that the output current stability from the asynchronous generators have been improved, which reduces the stresses on the AC grid and on the mechanical construction of the windmills.

  • 127.
    Mallampati, Vivek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Image Enhancement & Automatic Detection of Exudates in Diabetic Retinopathy2019Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Diabetic retinopathy (DR) is becoming a global health concern, which causes the loss of vision of most patients with the disease. Due to the vast prevalence of the disease, the automated detection of the DR is needed for quick diagnoses where the progress of the disease is monitored by detection of exudates changes and their classifications in the fundus retina images. Today in the automated system of the disease diagnoses, several image enhancement methods are used on original Fundus images. The primary goal of this thesis is to make a comparison of three of popular enhancement methods of the Mahalanobis Distance (MD), the Histogram Equalization (HE) and the Contrast Limited Adaptive Histogram Equalization (CLAHE). By quantifying the comparison in the aspect of the ability to detect and classify exudates, the best of the three enhancement methods is implemented to detect and classify soft and hard exudates. A graphical user interface is also adopted, with the help of MATLAB. The results showed that the MD enhancement method yielded better results in enhancement of the digital images compared to the HE and the CLAHE. The technique also enabled this study to successfully classify exudates into hard and soft exudates classification. Generally, the research concluded that the method that was suggested yielded the best results regarding the detection of the exudates; its classification and management can be suggested to the doctors and the ophthalmologists.

  • 128.
    Mallavarapu, Haritha
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Futuristic Teleconfernecing2012Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    Majorly the intension behind the engineering besides expecting cool and futuristic is to get appropriate eye contact and emotions back into the teleconferencing domain that two dimensional setups simply cannot provide. Under this system, the distant participant can make clear visual communication with particular people in her or his own frame of perspective. Teleconferencing is a communication technology that allows users at two or more different localizations to interact by making a face-to-face assembling environment. TC systems carry both audio, video and data streams throughout the session it has been gaining popularity in all government sectors. From the most recent demonstration of such a fantast manner of teleconferencing from university of southern California, “Attaining visual communication in a One-to-Many 3D Video Teleconferencing System”, receive a 3D teleconferencing developing a 3D teleconferencing is not only concerning the video but also experiencing a 3D audio by users. A 3D audio system can be described as a reliable audio captured by positioning of speakers. In this thesis we effort to develop a 3D audio system where two microphones and two speakers are used. This structure designed based on the behavior of the human ear while capturing sounds. I studied different usable methods for such structure and then I designed a new system which will be robust and friendly user. The idea of this new system from the scientist Zuccarelli’s theory(1983) which he said that human ear not only capture the sounds it emits sounds as well, and he designed holophonic for the recording sounds from human ear in scientific manner but he did not reveal. I took the concept from him then I captured all the positions of sounds in spherical form. I found that the sound is coming from which direction depending on the pattern of the sound signal; to capture the sounds and to find the directions I used interference and diffraction of the head. An ideal microphone arrangement therefore should be able to guide maximum directivity towards speech no matter which direction it initiates. Directional microphone technology has been used in hearing instruments since the late 1960s, and has been shown to effectively improve speech understanding in background noise. In a futurist implementation of directional microphones system can be interested for industrial and medical applications as well.

  • 129.
    Marchisio, Susana
    et al.
    Universidad Nacional de Rosario, Ingeniería y Agrimensura, ARG.
    Lerro, Federico
    Universidad Nacional de Rosario, ARG.
    Merendino, Claudio
    Universidad Nacional de Rosario, ARG.
    Plano, Miguel
    Universidad Nacional de Rosario, ARG.
    Concari, sonia
    Universidad Nacional de Rosario, ARG.
    De Arregui, Gaston Saez
    Universidad Nacional de Rosario, ARG.
    García-Zubía, Javier
    Universidad de Deusto, ESP.
    Hernández-Jayo, Unai
    Universidad de Deusto, .
    Alves, Gustavo
    IPP, Felgueiras, PRT.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Starting the Study of Electronic Circuits with VISIR Viewpoints of college students in a Pilot Test in Argentina2017Inngår i: PROCEEDINGS OF 2017 4TH EXPERIMENT@INTERNATIONAL CONFERENCE: Online Experimentation, exp.at 2017, Institute of Electrical and Electronics Engineers Inc. , 2017, s. 18-23Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper aims at introducing the first intensive use of a remote lab named as VISIR by lecturers and students from Facultad de Ciencias Exactas, Ingeniería y Agrimensura, Universidad Nacional de Rosario. The research was carried under the VISIR + project. It is a pilot test in which 17 students from the third year of an Electronic Engineering degree took part. The pilot test was developed in order to bring forward possible difficulties, assess successes and failures and eventually suggest other possible ways of curricular incorporation of VISIR in the teaching of the Physics of Electronic Devices subject. VISIR was used as a complement to hands-on lab, after the last experimental design activity of basic circuits with bipolar transistor. The students carried out an individual lab work. Then, they were asked to answer an opinion poll made up of 20 items, 1-4 Likert scale. Descriptive statistical analysis and summary of cases were carried out in order to conclude about four dimensions of analysis linked to the students' viewpoint. They are: perceived learnings, VISIR acceptance, perceived teachers' guidance and time and technical restrictions. © 2017 IEEE.

  • 130.
    Mattaparthi, Sai Venkata Akshay
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    The Impact of Hexagonal grid on thePrincipal Component of Natural Images2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The visual processing in the real world is different from the digital world. Monkey’s and a human’s visual world is richer and more colourful affording sight of flies, regardless of whether they are immobile or airborne. The study of the evolutionary process of our visual system indicates the existence of variationally spatial arrangement; from densely hexagonal in the fovea to a sparse circular structure in the peripheral retina. Normally we use a rectangular grid for the processing of images. But as per the perspective of the human eyes, the new approach is to change the grid from rectangular to hexagonal. Applying hexagonal grid in image processing is very advantageous and easy for mimicking human visual system. The main advantages for using the hexagonal structure in image processing is its resemblance to the arrangement of photoreceptors in the human eyes.

    The visual processing in the real world is different from the digital world. Monkey’s and a human’s visual world is richer and more colourful affording sight of flies, regardless of whether they are immobile or airborne. The study of the evolutionary process of our visual system indicates the existence of variationally spatial arrangement; from densely hexagonal in the fovea to a sparse circular structure in the peripheral retina. Normally we use a rectangular grid for the processing of images. But as per the perspective of the human eyes, the new approach is to change the grid from rectangular to hexagonal. Applying hexagonal grid in image processing is very advantageous and easy for mimicking human visual system. The main advantages for using the hexagonal structure in image processing is its resemblance to the arrangement of photoreceptors in the human eyes.

  • 131.
    Mehraban, Mehrdad
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Using Grid Network between VISIR Laboratories2015Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    VISIR “Virtual Instrument Systems in Reality” is a remote laboratory that empowers students and researchers to design, implement, and measure on electronic circuits remotely. Users are able to connect to this system regardless of their location and use traditional lab resources online via JavaScript and HTML5 enabled web browser. The VISIR project is deployed to seven universities around the globe including Blekinge Institute of Technology (BTH) in Sweden.

    In this thesis work, the main aim is to introduce load-balancing Scenarios in VISIR network in order to enable and improve load balancing, stability, and scalability in this system. The participant universities will be connected in a grid topology, and they exchange capabilities, features, and data repository in order to share workload and resources. For this purpose, the behavior of VISIR network nodes were studied and simplified as simple servers.

    According to the VISIR characteristics, infrastructure, and requirement a set of design paradigms and guidelines were defined for selecting suitable load balancing mechanism to be used in VISIR system. Four different load-balancing methods described, were selected for comparison in an experimental setup. Moreover, an experimental test bed with utilizing virtual Linux machines was modeled, and chosen scenarios were implemented and tested under different circumstances i.e. various number of servers and clients. 

  • 132.
    Minhas, Tahir Nawaz
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Shahid, Muhammad
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Lövström, Benny
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Rossholm, Andreas
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Zepernick, Hans-Jürgen
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Fiedler, Markus
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    QoE rating performance evaluation of ITU-T recommended video quality metrics in the context of video freezes2016Inngår i: Australian Journal of Electrical and Electronics Engineering, ISSN 1448-837X, Vol. 13, nr 2, s. 122-131Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In real-time video streaming, video quality can be degraded due to network performance issues. Among other artefacts, video freezing and video jumping are factors that influence user experience. Service providers, operators and manufacturers are interested in evaluating the quality of experience (QoE) objectively because subjective assessment of QoE is expensive and, in many user cases, subjective assessment is not possible to perform. Different algorithms have been proposed and implemented in this regard. Some of them are in the recommendation list of the ITU Telecommunication Standardization Sector (ITU-T). In this paper, we study the effect of the freezing artefact on user experience and compare the mean opinion score of these videos with the results of two algorithms, the perceptual evaluation of video quality (PEVQ) and temporal quality metric (TQM). Both metrics are part of the ITU-T Recommendation J.247 Annex B and C. PEVQ is a full-reference video quality metric, whereas TQM is a no-reference quality metric. Another contribution of this paper is the study of the impact of different resolutions and frame rates on user experience and how accurately PEVQ and TQM measure varying frame rates.

  • 133.
    Moazzam, Muhammad
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Rabbani, Muhammad Shoaib
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance Evaluation of Different Active Noise Control (ANC) Algorithms for Attenuating Noise in a Duct2014Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    Adaptive filter algorithms are extensively use in active control applications and the availability of low cost powerful digital signal processor (DSP) platforms has opened the way for new applications and further research opportunities in e.g. the active control area. The field of active control demands a solid exposure to practical systems and DSP platforms for a comprehensive understanding of the theory involved. Traditional laboratory experiments prove to be insufficient to fulfill these demands and need to be complemented with more flexible and economic remotely controlled laboratories. The purpose of this thesis project is to implement a number of different adaptive control algorithms in the recently developed remotely controlled Virtual Instrument Systems in Reality (VISIR) ANC/DSP remote laboratory at Blekinge Institute of Technology and to evaluate the performance of these algorithms in the remote laboratory. In this thesis, performance of different filtered-x versions adaptive algorithms (NLMS, LLMS, RLS and FuRLMS) has been evaluated in a remote Laboratory. The adaptive algorithms were implemented remotely on a Texas Instrument DSP TMS320C6713 in an ANC system to attenuate low frequency noise which ranges from 0-200 Hz in a circular ventilation duct using single channel feed forward control. Results show that the remote lab can handle complex and advanced control algorithms. These algorithms were tested and it was found that remote lab works effectively and the achieved attenuation level for the algorithms used on the duct system is comparable to similar applications. Keywords: Active Noise Control, Adaptive Algorithms, L-LMS, N-LMS, FuLMS, RLS

  • 134. Mohammadnejad, M.
    et al.
    Ghazvini, .
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    INITE ELEMENT MODELING OF DYNAMICPROPERTIES OF POWER SUPPLY FOR AN INDUSTRIAL APPLICATION2015Konferansepaper (Annet vitenskapelig)
  • 135.
    Mohammadnejad, Mostafa
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Ghazvini, Mandi
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling. Blekinge Inst Technol, Via Valhallavagen, S-37141 Karlskrona, Sweden..
    FINITE ELEMENT MODELING OF DYNAMIC PROPERTIES OF POWER SUPPLY FOR AN INDUSTRIAL APPLICATION2015Inngår i: PROCEEDINGS OF THE 22ND INTERNATIONAL CONGRESS ON SOUND AND VIBRATION: MAJOR CHALLENGES IN ACOUSTICS, NOISE AND VIBRATION RESEARCH, 2015 / [ed] Crocker, MJ Pawelczyk, M Pedrielli, F Carletti, E Luzzi, S, INT INST ACOUSTICS & VIBRATION , 2015Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this study, the dynamic properties of the mechanic structure of Power Supply for an industrial application is considered. A finite element model of the Power Supply mechanic structure has been generated with the aid of the MSC Marc software. Based on the FE model; modal analysis has been carried out and the eigenfrequencies and eigenmodes for the FE model have been calculated in a suitable frequency range. Relevant frequency response functions for the FE model have been produced using dynamic harmonic analysis. To validate and update the FE model, experimental modal analysis has been carried out on a Power Supply. For the experimental modal analysis the MIMO method the polyreference least-squares complex exponential method has been used. Based on the updated FE model some modified Power Supply designs are suggested with improved dynamic properties in an adequate frequency range.

  • 136.
    Mohanasundaram, Raj Kumar
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Natarajan, Venkata Krishnan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Wireless bio sensing with mobile monitoring system2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Personal tele-health solutions are believed to be important future instruments to tackle the global challenges of aging population and increasing costs for health care. Tiny and wireless connected medical sensors such as those embedded in clothes or onto the body become an integrated part of the lifestyle and will allow hospitals to remotely diagnose patients from their home.

    In this thesis, a wireless bio-sensing system is proposed to provide a home-based healthcare service for continuous monitoring. This idea is based on Internet of things (IoT), where there is always someone who has information (server) and someone who needs that information (client).

    This thesis work involves the designing of Bluetooth Low Energy (BLE) profile for the designed BLE capable ECG health sensor. With that BLE profile, a wireless communication and data transfer are possible. An iPhone Operating System (iOS) application is developed to connect to this health sensor and to get the data from the sensor. In addition to displaying the ECG waveform from the sensor, the smart phone’s GPS and accelerometer sensors are used to give location details, in detecting a patient’s fall and also alarming if the fall looks unusual. There is a facility to store these data for any given time for later use to perform further analysis.

  • 137.
    Moreira, Miguel
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Ruiz, José Luis
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Smart Hockey Goal2017Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Context: ​Nowadays, the ice hockey is one of the main sports in Sweden and year by year the number of people that practice it is raising. For practicing the accuracy of the shot there are not a lot of devices in the market and the ones that already exist use high definition cameras and complex sensors which makes them very expensive to the amateur practice of the sport.

    Objectives: The main aim of this project is to build a prototype of a hockey goal able to detect and measure the speed of the hockey puck when it goes into the goal. In this paper, we present a solution for detecting and measuring phase using different sensors and a Kinect camera. For the position there have been used laser emitters with photoresistors and ultrasonic sensors, and for the speed detection there have been used a doppler sensor, HB100 and the Microsoft Kinect camera. The goal is to show that there are cheaper solutions than the ones used in the professional world.

    Method: Using a Arduino board we will divide the project into two phases, the detection phase and the speed measure phase. In the first phase we will detect the puck using two methods and at the end we will compare them to know which one is more appropriate to apply in order to have as much accuracy as possible. The first method will be using photoresistors and lasers so when the Arduino board detects a huge variation of the photoresistor it will mean that the puck has crossed the goal line and a LED will turn on. The second method will be using ultrasound sensors which detect the distance to and object. We will put the sensors on the top of the goal and the will measure the distance to the floor, if this distance changes it means that the distance calculated is the one to the puck and not the floor so a LED will be turned on. In the second phase we will calculate the speed of the puck using two methods and we will compare the results. The first method will be using the HB100 sensor which will be fixed on the top of the goal. The sensor will print on the screen the speed values of the puck when it goes into the goal.

    The second method will use a Kinect camera to detect the puck and calculate the speed detecting it in two different places and knowing the difference of time between them.

    Results: ​We will do some test for each phase and method and finally we will calculate the accuracy of the method, compare the results and decide which is the best method for achieving the objectives.

  • 138.
    Mucharla, Harindra Sai Tej
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Sana, Raj Sekhar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Namuduri, Satyanarayana
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Combination of Fingerprints for New Identity and Protection2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
  • 139.
    Narri, Vandana
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance and Improvement Investigation of Accelerated Temperature Change Test.2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This thesis is focused on Accelerated Temperature Change Test (ATCT). This test is performed in order to deteriorate and age a product in a faster than natural way. The ATCTs are primarily controlled with four parameters: the temperature range (∆T), ramp rate (RR), dwell time (DT) and number of cycles in test ( . A comprehensive investigation was carried out to analyze the performance and functionality of the cabinet, used for performing ATCT. This was achieved by performing repeated measurements in the empty cabinet with different combinations of temperature range (∆T) and dwell time (DT). The test parameters are normally adjusted according to values given in the standards common in automotive environmental testing and also according to the thermal properties and size of the tested components. In this investigation, four different standards for accelerated testing were taken into consider. They are TB1900, ISO 16750-4:2010 (International Organization for Standardization), IEC 60068-2-14 (International Electrotechnical Commission) and The GMW3172: User Guide. From each standard, each parameter definitions are illustrated.

    Practical tests were executed on three different types of components and with different test conditions. A suitable experimental-setup was prepared to record the temperature measurements on/in the DUT (Device Under Test). This experimental-setup was designed using thermocouples (Type - K) and DEWESoft. The results from the test were used to analyze the deviation between the standards and practical testing. This comparison helps in understanding the required improvements in the test parameters values i.e. the cabinet parameter settings or the test conditions. The values assigned for each parameter before the test are called Cabinet Parameter Settings (CPS). The temperature readings from the DUT are recorded and plotted after ATCT. Based on these ATCT measurements, optimal values of the test parameter are estimated. These are called Estimated Parameter Values (EPV). A significant deviation is observed between CPS and EPV.

    From these EPV, an acceleration factor (AF) for each test is calculated using two different life prediction models i.e. (i) Coffin-Manson and (ii) Norris Landzberg. And using this AF, an evaluation of the “number of cycles in the field (Nf)” with certain “number of cycles in the test (Nt)” is made. This evaluation helps in understanding the effect of parameter values during the test on the acceleration conditions. A simple aluminum box (one of the test component) is replicated into a simple structure, to implement in COMSOL Multiphysics Simulations. When the simulation results show good agreement with practical results, then simulations are recommended to be used to find the proper test conditions and test parameter values. Further, the simulations are used to find the sensitive point in/on the component. These simulations take some reasonable efforts.

    Index Terms— Acceleration factor, Dwell time, Fatigue failure, Accelerated temperature change test, Stress level, Temperature range, Coefficient of Thermal Expansion.

  • 140.
    Nekkanti, Veera Venkata Satyanarayana
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nalajala, Kaushik Sai Srinivas
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Super Resolution Image Reconstruction for Indian Remote Sensing Satellite (Cartosat-1)2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
  • 141.
    Ni, Houbo
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling. Shanghai Second Polytechnic University.
    Smart coffee maker2017Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Nowadays, more and more people drink coffee not only from Starbucks or other shops, but also brew coffee from coffee maker which with proper sizes which they can be put in the resting room of companies or homes.

    The products of coffee maker polarize in the market. Some of them have powerful functions and nice tastes with high prices. The others are simple, cheap but losing enjoyment of drinking coffee and people need to keep an eye on status of coffee maker. Most of people prefer the cheaper type. But more functions will take more convenience.

    Actually users can have them both. In this thesis, I design some functions based on the cheap type of coffee maker which will make drinking coffee more convenient and enjoyable.

    I use Arduino Uno as my control system, cooperating with sensors and special circuits. My system monitor working time of coffee maker, temperature of coffee and water level of both coffee pot and tank in the coffee maker. Then users can receive these values from their cell phone and doing remote control. Meanwhile considering about prices, I choose the most suitable sensors for measurement. I also do some jobs for saving energy and safe. The system locks or turns off the switch automatically for them. At last, all the sensors, wires and control chip are put in good positions in the maker. 

  • 142.
    Nilsson, Kristian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Development and Evaluation of OpenLabs and the VISIR Open Electronics and Radio Signal Laboratory for Education Purpose2014Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Part I and II of this thesis constitute a theoretical and practical approach on how to open up a laboratory for remote access and enabling students to have access to the equipment 24/7. Part I covers a more general solution for enabling remote access to equipment; the suggested solution can be applied to all types of instruments that can be controlled from a PC based system. Part III and IV of this thesis present an encouragement to collaborate within in the field of remote engineering to utilize the recourses more efficiently. The idea is that universities around the world can share their experiments in a grid laboratory; every university contributes with a small part, but gets access to a wide range of experiments in this grid. Part V of this thesis concerns the modelling and simulation of the remote electronics laboratory with the purpose of estimating the maximum number of simultaneous users without losing the experience of working with a real instrument. The results indicate that one single remote electronics laboratory can handle up to 120 users simultaneously and with 120 users the delay for each user is approximately 2 seconds.

  • 143.
    Nouripayam, Masoud
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Sheikhipoor, Nima
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    HEVC (H.265) Intra-Frame prediction implementation Using MATLAB2014Independent thesis Basic level (degree of Bachelor)Oppgave
    Abstract [en]

    HEVC (H.265) standard is the latest enhanced video coding standard which was planned to improve the rendered specifications of its preceding standard MPEG-4 (H.264). According to the H.265 “The main goal of the HEVC standardization effort is to enable significantly improved compression performance relative to existing standards—in the range of 50% bit-rate reduction for equal perceptual video quality” [2]. Intra-picture prediction is a tool in HEVC which “uses some prediction of data spatially from region-to-region within a specific picture, but has no dependence on other pictures in the video frames” [2]. Intra-picture prediction of HEVC is the legacy of intra-frame prediction tool in H.264. Although both of them has the same approach in for spatial prediction of pictures based on spatial sample prediction followed by transform coding, H.265 intra-frame prediction uses much more developed features compared to H.264. An overview of the main features in intra-frame prediction of H.265 could be written as follows:  A quad-tree block division structure with respect to amount of details in an image  33 Angular modes in angular prediction (just 8 different modes in H.264)  Planar prediction for smoothing the sample surfaces [2] It’s worth mentioning that the quad-tree structure of H.265 intra normally uses square block with sizes in range 4, 8, 16, 32 and 64 (different block sizes based-on the level of granularity in the image), while in H.264 the processing units are up to macro-blocks of 16x16 samples. Moreover, while this video coding standard splits images to one luma and two chroma parts, thesis focuses only on the implementation of intra-prediction on luma part of an image. This thesis aims at implementation of the intra-frame prediction of HEVC using MATLAB. All the steps of implementation process are listed as follows:  Converting RGB images to YUV colour-space and working on the luma part (or Y)  Splitting images to square blocks ranging from 4 to 64 pixels  Implementing intra-frame prediction algorithm  Comparing intra-prediction output of H.264 and H.265 in square blocks with size 4 and 16 pixels This Thesis is organised in 3 main sections. The first and second sections revolve around literature review and definition of the concept of HEVC standard and intra-prediction respectively. The third section focuses on the implementation process and evaluation of the prediction algorithm. Finally, in the evaluation part, based-on statistical graphs derived from the output comparison of H.264 and H.265 intra-prediction for different images, it has been demonstrated that H.265 by far has a better image quality than of the H.264.

  • 144.
    Noursobhi, Soroush
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Puzzle Up: Android Jigsaw Puzzle Game2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Development of a jigsaw based puzzle game for Android called PuzzleUp. The idea is that user takes a picture in real time and breaks it into jigsaw pieces that has to be put together. It also features a multiplayer mode on local area network (LAN).The main programming language used is Java and the main development environment is Android Studio (Based on JetBrains Idea) and AllJoyn has been used for inter-device communication to ensure maximum compatibility.

  • 145. Odeh, S.
    et al.
    Anabtawi, M.
    Alves, G. R.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Arafeh, L.
    Assessing the remote engineering lab VISIR at Al-Quds university in Palestine2015Inngår i: International Journal of Online Engineering, ISSN 1861-2121, Vol. 11, nr 1, s. 35-38Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Engineering labs play a vital role in engineering education, make science come alive, and supply students with better understanding of theories. As a result, they contribute to the improvement of their knowledge and skills. Remote labs not enable sharing of teaching resources such as devices, equipment and instrumentations between universities, but also relax time and space constraints; yet they are considered as a complementary asset to the traditional hands-on labs. This paper is concerned with a two-stage assessment of the engineering remote lab VISIR. In the first stage, the assessment investigated if the students accept to use VISIR in their future lab courses at the Faculty of Engineering at Al-Quds University in Palestine. In the second stage, a deeper analysis will be performed to compare VISIR to hands-on and simulators based on the evaluation criteria: performance, students’ retention rate and satisfaction survey.

  • 146.
    Odeh, Salaheddin
    et al.
    Al Quds Univ, Fac Engn, Dept Comp Engn, IL-20002 Jerusalem, Israel..
    Alves, Joaquim
    Polytech Porto, Sch Engn, P-4249015 Oporto, Portugal..
    Alves, Gustavo Riberiro
    Polytech Porto, Sch Engn, P-4249015 Oporto, Portugal..
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling. Blekinge Inst Technol, SE-37179 Karlskrona, Sweden..
    Anabtawi, Mahasen
    Al Quds Univ, Fac Engn, Dept Comp Engn, IL-20002 Jerusalem, Israel..
    Arafeh, Labib
    Al Quds Univ, Fac Engn, Dept Comp Engn, IL-20002 Jerusalem, Israel..
    Jazi, Mahran
    Al Quds Univ, Fac Engn, Dept Comp Engn, IL-20002 Jerusalem, Israel..
    Arekat, Mahmoud R.
    Al Quds Univ, Fac Engn, Dept Comp Engn, IL-20002 Jerusalem, Israel..
    A Two-Stage Assessment of the Remote Engineering Lab VISIR at Al-Quds University in Palestine2015Inngår i: IEEE REVISTA IBEROAMERICANA DE TECNOLOGIAS DEL APRENDIZAJE-IEEE RITA, ISSN 1932-8540, Vol. 10, nr 3, s. 175-185Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Engineering labs are an essential part in engineering education, since they provide practical knowledge for students, illustrate concepts and principles, and improve technical skills. Remote labs allow devices, equipment, and instrumentations to be shared with other universities. In addition, they relax time and space constraints, and are capable of being adapted to the pace of each student; in the case, there was insufficient time in the laboratory. This paper describes an empirical study, which embeds two stages of assessment. In the first stage, we are concerned with finding out the level of flexibility when applying the engineering remote lab VISIR as a contemporary remote lab technology in the engineering faculty at Al-Quds University in Jerusalem in Palestine, and whether the engineering students will accept such technology to interact with in their future lab courses or not. In the second stage of the assessment study, a more in-depth comparative analysis will be carried out in order to have a categorization of VISIR in the landscape of the engineering labs, such as hands-on and simulations. The three lab approaches will be compared with each other by means of an experimental testing based on assessment criteria that are in accordance with the fundamental course objectives of engineering instructional labs: student's retention rate and satisfaction survey, as well as their performance.

  • 147. Odeh, Salaheddin
    et al.
    Joaquim, Alves
    Gustavo, Ribeiro Alves
    Anabtawi, Mahasen
    Jazi, Mahran
    Arekat, Mahmoud
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Experiences of Application of VISIR at the University of Al-Quds2014Inngår i: 2014 11TH INTERNATIONAL CONFERENCE ON REMOTE ENGINEERING AND VIRTUAL INSTRUMENTATION (REV), IEEE Computer Society, 2014, s. 346-352Konferansepaper (Fagfellevurdert)
  • 148.
    Ogielski, Radoslaw
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Lubowicki, Arkadiusz
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    The Agile-Based Monitoring and Management System for Dairy Supply Chain: The User Driven Design Approach2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    The paper considers how the agile concept can be included in the User Driven Design framework. This design method combines requirements and constraints of users and stakeholders. The agile concept can be treated as one of the requirements, which should be considered differently by various users and stakeholders. The design process depends on the application fields and has to be implemented accordingly to their characteristics.

    The case study of this research is a monitoring and management system that enables an adaptation of the conventional dairy supply chain to the agile supply chain strategy. Due to the personalised needs of every milk supplier and daily variation of the milk production, the efficient dairy supply chain requires a real-time data regarding adaptations to the changes. The system should accommodate not only changes dependent on external environmental conditions, but also unpredictable internal circumstances. The agile-based supply chain could help to maintain the high responsiveness and flexibility among the dairy plant, transportation provider and milk suppliers.

    An engineering solution evaluates the agile strategy. It includes hardware and software, which monitor and manage transportation as a part of the dairy supply chain. The solution is implemented and tested at a medium-sized dairy company.

  • 149. Olsson, T.
    et al.
    Källström, Elisabeth
    Gillblad, D.
    Funk, P.
    Håkansson, Lars
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Lundin, J.
    Svensson, M.
    Larsson, J.
    Fault Diagnosis of Heavy Duty Machines: Automatic Transmission Clutches2014Inngår i: Proceedings of the Workshop Program of ICCBR-14, 2014Konferansepaper (Fagfellevurdert)
  • 150.
    Pamidi, Vipul. vijigiri; Taraka Rama Krishna
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Ultrasound induced cavitation and resonance amplification using adaptive feedback Control System2014Independent thesis Advanced level (degree of Master (Two Years))Oppgave
    Abstract [en]

    Acoustic cavitation in fluids using high powered ultrasound has been of great interest in industries and biomedical engineering. The need for high-intensity focused ultrasound (sound with frequencies between 20 kHz to 10 MHz) and modeling of such systems has drawn great attention in engineering. Ultrasound excitation has found recent application in terms of replacing the existing dynamic mechanical systems that use high energy with low levels of efficiency. The proposed thesis work focuses on an application of acoustic cavitation and on adaptive control of resonance amplification to be used in the paper pulp industry. The primary objective is to keep a system of coupled and tuned resonances stable, and by that obtain high cavitation intensity in a water filled beaker. The secondary aspect is to numerically model and experimentally evaluate a prototype beaker, where the adaptive control scheme is implemented to attain high and stable cavitation intensity. The characteristic control parameters (excitation frequency and amplitude) can be adjusted to the fluid condition in the beaker (reactor) by a feedback control from a pressure sensor inside the beaker. The aim of this feedback loop is to keep the resonance phenomena stable with respect to an adaptable frequency. In this application, the resonance amplification is mainly used to generate and control cavitation at a frequency that corresponds to a range of beaker natural frequencies. The results of the development process show that high cavitation intensity can be achieved by ultrasound induced power. The electric power input required to achieve high cavitation intensity is relatively low and resulted in high energy efficiency. The results of the study will be used for an application for fibrillation of cellulose fibers to further improve energy efficiency in paper pulp industry.

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