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  • 1.
    Alves, G.
    et al.
    Polytech Porto, PRT.
    Fidalgo, A.
    Polytech Porto, PRT.
    Marques, M.
    Polytech Porto, PRT.
    Viegas, M.
    Polytech Porto, PRT.
    Felgueiras, M.
    Polytech Porto, PRT.
    Costa, R.
    Polytech Porto, PRT.
    Lima, N.
    Polytech Porto, PRT.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling. Blekinge Inst Technol, Karlskrona, Sweden..
    Zubia, J.
    Univ Deusto, ESP.
    Castro, M.
    Natl Distance Educ Univ, ESP.
    Pester, A.
    Carinthia Univ Appl Sci, AUT.
    Pavani, A.
    Pontifical Catholic Univ Rio de Janeiro, BRA.
    Silva, J.
    Univ Fed Santa Catarina, BRA.
    Schlichting, L.
    Fed Inst Santa Catarina, BRA.
    Marchisio, S.
    Natl Univ Rosario, ARG.
    Fernandez, R.
    Natl Univ Santiago del Estero, ARG.
    Oliveira, V.
    Brazilian Assoc Engn Educ, BRA.
    Pozzo, M.
    Inst Rosario Invest Ciencias Educ, ARG..
    USING A 3-TIER TRAINING MODEL FOR EFFECTIVE EXCHANGE OF GOOD PRACTICES IN AN ERASMUS plus PROJECT2018Ingår i: 12TH INTERNATIONAL TECHNOLOGY, EDUCATION AND DEVELOPMENT CONFERENCE (INTED) / [ed] Chova, LG Martinez, AL Torres, IC, IATED-INT ASSOC TECHNOLOGY EDUCATION & DEVELOPMENT , 2018, s. 6392-6400Konferensbidrag (Refereegranskat)
    Abstract [en]

    VISIR+ is an Erasmus+ project that aims to develop educational modules for electric and electronic circuits theory and practice following an enquiry-based teaching and learning methodology. The project has installed five new VISIR remote labs in Higher Education Institutions located in Argentina and Brazil, to allow students doing more experiments and hence acquire better experimental skills, through a combination of traditional (hands-on), remote and virtual laboratories. A key aspect for the success of this project was to motivate and train teachers in the underpinning educational methodology. As such, VISIR+ adopted a 3-tier training process to effectively support the use of VISIR in the Institutions that received it. This process is based on the "train the trainer" approach, which required the participating partner institutions to identify and engage a number of associated partners, interested in using their newly installed remote lab. To measure the quality of the training process, the same satisfaction questionnaire was used in all training actions. This paper presents a detailed description of the training actions along with the analysis of the satisfaction questionnaire results. Major conclusions are that the quality level of the training process remained practically the same across all training actions and that trainees sometimes considered the practical use of the VISIR remote lab as difficult, irrespectively of where and when the training action took place.

  • 2.
    Alves, G. R.
    et al.
    Natércia Lima Polytechnic of Porto, PRT.
    Felgueiras, M.
    Natércia Lima Polytechnic of Porto, PRT.
    Viegas, C.
    Natércia Lima Polytechnic of Porto, PRT.
    Fidalgo, A.
    Natércia Lima Polytechnic of Porto, PRT.
    Castro, M.
    Universidad Nacional de Educación a Distancia, ESP.
    García-Zubía, J.
    niversidad de Deusto, ESP.
    Pester, A.
    Carinthia University of Applied Sciences, AUT.
    Pavani, A.
    Pontifícia Universidade Católica do Rio de Janeiro, BRA.
    Fernandez, R.
    Universidad Nacional de Santiago del Estero, ARG.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Pozzo, M. I.
    IRICE-CONICET, ARG.
    Oliveira, V.
    Universidade Federal de Juiz de Fora, BRA.
    Silva, J. B.
    Universidade Federal de Santa Catarina, BRA.
    Marchisio, S.
    Universidad Nacional de Rosario, ARG.
    Schlichting, L. C. M.
    nstituto Federal de Santa Catarina, BRA.
    A sustainable approach to let students do more real experiments with electrical and electronic circuits2018Ingår i: SIXTH INTERNATIONAL CONFERENCE ON TECHNOLOGICAL ECOSYSTEMS FOR ENHANCING MULTICULTURALITY (TEEM'18) / [ed] GarciaPenalvo, FJ, Association for Computing Machinery , 2018, s. 508-514Konferensbidrag (Refereegranskat)
    Abstract [en]

    The present paper focus on the use of remote laboratories in higher education from a sustainability viewpoint. The particular case of engineering education, and, within it, the more specific subject of experiments with electrical and electronic circuits is presented first, to then discuss the benefits of using remote labs, while considering the three dimensions of sustainable development, i.e.: economic practice, environmental protection, and social integration. The paper debates how remote labs address each dimension. © 2018 Copyright is held by the owner/author(s). Publication rights licensed to ACM.

  • 3. Chen, Jiandan
    et al.
    Adebomi, Oyekanlu Emmanuel
    Olusayo, Onidare Samuel
    Kulesza, Wlodek
    The Evaluation of the Gaussian Mixture Probability Hypothesis Density Approach for Multi-target Tracking2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper describes the performance of the Gaussian Mixture Probability Hypothesis Density (GM-PHD) filter for multiple human tracking in an intelligent vision system. Human movement trajectories were observed with a camera and tracked by the GM-PHD filter. The filter multi-target tracking ability was validated by two random motion trajectories in the paper. To evaluate the filter performance in relation to the target movement, the motion velocity and angular velocity as key evaluation factors were proposed. A circular motion model was implemented for simplified analysis of the filter tracking performance. The results indicate that the mean absolute error defined as the difference between the filter prediction and the ground truth is proportional to the motion speed and angular velocity of the target. The error is only slightly affected by the tracking targets’ number.

  • 4. Chen, Jiandan
    et al.
    Ghadami, Soheil
    Kulesza, Wlodek
    Evaluation of the GM-PHD filter for multi-target tracking with a stereo vision system2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper evaluates the performance of the Gaussian Mixture Probability Hypothesis Density (GM-PHD) filter for tracking multiple targets in an intelligent vision system. A stereo vision camera is used to get the left and right image sequences in order to extract 3-D coordinates of the targets' positions in the real world scene. The 3-D trajectories of the targets are tracked by a GM-PHD filter. Moreover, the label continuity of the targets is guaranteed by a new method of labeling. Motion speed and angular velocity are proposed for the evaluation of the accuracy and label continuity of the filter in the implemented 3-D test motion model. The simulation results for two moving targets show that the proposed system not only robustly tracks them, but also maintains the label continuity of the two targets.

  • 5.
    Chen, Jiandan
    et al.
    Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för elektroteknik.
    Khatibi, Siamak
    Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för elektroteknik.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för elektroteknik.
    Depth reconstruction uncertainty analysis and improvement: The dithering approach2010Ingår i: Image and Vision Computing, ISSN 0262-8856, E-ISSN 1872-8138, Vol. 29, nr 9, s. 1377-1385Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The depth spatial quantization uncertainty is one of the factors which influence the depth reconstruction accuracy caused by a discrete sensor. This paper discusses the quantization uncertainty distribution, introduces a mathematical model of the uncertainty interval range, and analyzes the movements of the sensors in an Intelligent Vision Agent System. Such a system makes use of multiple sensors which control the deployment and autonomous servo of the system. This paper proposes a dithering algorithm which reduces the depth reconstruction uncertainty. The algorithm assures high accuracy from a few images taken by low-resolution sensors. The dither signal is estimated and then generated through an analysis of the iso-disparity planes. The signal allows for control of the camera movement. The proposed approach is validated and compared with a direct triangulation method. The simulation results are reported in terms of depth reconstruction error statistics. The physical experiment shows that the dithering method reduces the depth reconstruction error.

  • 6. Chen, Jiandan
    et al.
    Khatibi, Siamak
    Kulesza, Wlodek
    Planning of a Multi Stereo Visual Sensor System Depth Accuracy and Variable Baseline Approach2007Konferensbidrag (Refereegranskat)
  • 7. Chen, Jiandan
    et al.
    Khatibi, Siamak
    Kulesza, Wlodek
    Planning of a Multi Stereo Visual Sensor System for a Human Activities Space2007Konferensbidrag (Refereegranskat)
  • 8. Chen, Jiandan
    et al.
    Khatibi, Siamak
    Wirandi, Jenny
    Kulesza, Wlodek
    Planning of a Multi Sensor System for Human Activities Space – Aspects of Iso-disparrity Surface2007Konferensbidrag (Refereegranskat)
    Abstract [en]

    The Intelligent Vision Agent System, IVAS, is a system for automatic target detection, identification and information processing for use in human activities surveillance. This system consists of multiple sensors, and with control of their deployment and autonomous servo. Finding the optimal configuration for these sensors in order to capture the target objects and their environment to a required specification is a crucial problem. With a stereo pair of sensors, the 3D space can be discretized by an iso-disparity surface, and the depth reconstruction accuracy of the space is closely related to the iso-disparity curve positions. This paper presents a method to enable planning the position of these multiple stereo sensors in indoor environments. The proposed method is a mathematical geometry model, used to analyze the iso-disparity surface. We will show that the distribution of the iso-disparity surface and the depth reconstruction accuracy are controllable by the parameters of such model. This model can be used to dynamically adjust the positions, poses and baselines lengths of multiple stereo pairs of cameras in 3D space in order to get sufficient visibility and accuracy for surveillance tracking and 3D reconstruction. We implement the model and present uncertainty maps of depth reconstruction calculated while varying the baseline length, focal length, stereo convergence angle and sensor pixel length. The results of these experiments show how the depth reconstruction uncertainty depends on stereo pair’s baseline length, zooming and sensor physical properties.

  • 9. Chen, Jiandan
    et al.
    Mustafa, Wail
    Siddig, Abu Bakr
    Kulesza, Wlodek
    APPLYING DITHERING TO IMPROVE DEPTH MEASUREMENT USING A SENSOR-SHIFTED STEREO CAMERA2010Ingår i: Metrology and Measurement Systems, ISSN 0860-8229, Vol. 17, nr 3Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The sensor-shifted stereo camera provides the mechanism for obtaining 3D information in a wide field of view. This novel kind of stereo requires a simpler matching process in comparison to convergence stereo. In addition to this, the uncertainty of depth estimation of a target point in 3D space is defined by the spatial quantization caused by the digital images. The dithering approach is a way to reduce the depth reconstruction uncertainty through a controlled adjustment of the stereo parameters that shift the spatial quantization levels. In this paper, a mathematical model that relates the stereo setup parameters to the iso-disparities is developed and used for depth estimation. The enhancement of the depth measurement accuracy for this kind of stereo through applying the dithering method is verified by simulation and physical experiment. For the verification, the uncertainty of the depth measurement using dithering is compared with the uncertainty produced by the direct triangulation method. A 49% improvement of the uncertainly in the depth reconstruction is proved.

  • 10. Chen, Jiandan
    et al.
    Olayanju, Iyeyinka Damilola
    Ojelabi, Olabode Paul
    Kulesza, Wlodek
    RFID Multi-Target Tracking Using the Probability Hypothesis Density Algorithm for a Health Care Application2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    The intelligent multi-sensor system is a system for target detection, identification and information processing for human activities surveillance and ambient assisted living. This paper describes RFID multi-target tracking using the Gaussian Mixture Probability Hypothesis Density, GM-PHD, algorithm. The multi target tracking ability of the proposed solution is demonstrated in a simulation and real environment. A performance comparison of the Levenberg-Marquardt algorithm with and without the GM-PHD filter shows that the GM-PHD algorithm improves the accuracy of tracking and target position estimation significantly. This improvement is demonstrated by a simulation and by a physical experiment.

  • 11.
    Dziak, D.
    et al.
    Faculty of Electrical and Control Engineering, Gdansk University of Technology, Gabriela Narutowicza 11/12, Gdansk, Poland.
    Jachimczyk, B.
    Faculty of Electrical and Control Engineering, Gdansk University of Technology, Gabriela Narutowicza 11/12, Gdansk, Poland.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Wirelessly interfacing objects and subjects of healthcare system - IoT approach2016Ingår i: Elektronika ir Elektrotechnika, ISSN 1392-1215, Vol. 22, nr 3, s. 66-73Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Wireless sensor networks, WSN, for which development has begun by military applications, are nowadays applied to all human activities; e.g. in medicine for patience monitoring or to reduce the effects of disasters. Therefore, the WSNs area has been also one of the emerging and fast growing scientific fields. Increasing interest of WSNs is even caused by equally intense growth of interest in the Internet of Things domain, IoT, in which WSNs constitute a significant part. These reasons have brought about developing low cost, low-power and multi-function sensor nodes. However, the major fact that sensor nodes run quickly out of energy has been an issue and many energy efficient routing protocols have been proposed to solve this problem. Case study presented in this paper concern design of WSN in IoT concept from system lifetime perspective. A hierarchical routing technique, which shows energy efficiency, has been validated. Simulation results show that chosen technique prolongs the lifetime of the WSN compared to other investigated clustering schemes. The advantages of this method are validated by comparative studies. Index Terms - Energy efficiency; Internet of Things, routing protocol; wireless sensor networks.

  • 12. Dziak, D. M.
    et al.
    Jachimczyk, B. S.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för maskinteknik.
    An Analysis of Uncertainty and Robustness of Waterjet Machine Positioning Vision System2013Ingår i: Elektronika Ir elektrotechnika, ISSN 1392-1215, Vol. 19, nr 9, s. 89-92Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The paper presents a new Automatic Waterjet Positioning Vision System (AWPVS) and investigates components of workpiece positioning accuracy. The main purpose of AWPVS is to precisely identify the position and rotation of a workpiece placed on a waterjet machine table. Two webcams form a basis for the system, and constitute its characteristics. The proposed algorithm comprises various image processing techniques to assure a required identification precision. To validate the PVS identification quality, synthetic images were applied under various conditions. The analysis ascertains dependence of an object detection rate and accuracy on a size of cropping frame. Experimental results of the proposed PVS prototype prove that a combination of the vision algorithm and webcams is an alternative to dedicated expensive industrial vision systems. The two main components of AWPVS uncertainty, a machine component and PSV component are discerned and estimated.

  • 13.
    Dziak, Damian
    et al.
    Politechnika Gdanska, POL.
    Jachimczyk, Bartosz
    BetterSolutions S.A., POL.
    Bork-Ceszlak, Krzysztof
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Zydanowicz, Tadeusz
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Wireless monitoring system for fireman's competence objective assessment2017Ingår i: Elektronika ir Elektrotechnika, ISSN 1392-1215, Vol. 23, nr 4, s. 56-62Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Developing technologies associated with tracking human movement and behaviour enable new applications for competence assessments from training results of professionals, such as medical staff, sportsmen or emergency servicemen. This article considers a methodological approach to design a system for firefighter's skills and competence assessment. Assessed training features such as in-building behaviour and tasks execution are analysed based on data gathered with wireless Ultra-Wideband Real-Time Location System, UWB RTLS, and Inertial Measurement Unit, IMU. The assessment is based on the predefined required training tasks, the expert's expertise and results of the trainee's test. The Unity game engine is used for data processing and visualization. As the comprehensive final map of the trainee's skills, the spider diagram is applied and the single score method provides the conclusive statement. The proposed solution was verified experimentally in real environment.

  • 14.
    Dziak, Damian
    et al.
    Politechnika Gdanska, POL.
    Jachimczyk, Bartosz
    BetterSolutions S.A., POL.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    IoT-based information system for healthcare application: Design methodology approach2017Ingår i: Applied Sciences, E-ISSN 2076-3417, Vol. - 7, nr - 6, artikel-id 596Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    - Over the last few decades, life expectancy has increased significantly. However, elderly people who live on their own often need assistance due to mobility difficulties, symptoms of dementia or other health problems. In such cases, an autonomous supporting system may be helpful. This paper proposes the Internet of Things (IoT)-based information system for indoor and outdoor use. Since the conducted survey of related works indicated a lack of methodological approaches to the design process, therefore a Design Methodology (DM), which approaches the design target from the perspective of the stakeholders, contracting authorities and potential users, is introduced. The implemented solution applies the three-axial accelerometer and magnetometer, Pedestrian Dead Reckoning (PDR), thresholding and the decision trees algorithm. Such an architecture enables the localization of a monitored person within four room-zones with accuracy; furthermore, it identifies falls and the activities of lying, standing, sitting and walking. Based on the identified activities, the system classifies current activities as normal, suspicious or dangerous, which is used to notify the healthcare staff about possible problems. The real-life scenarios validated the high robustness of the proposed solution. Moreover, the test results satisfied both stakeholders and future users and ensured further cooperation with the project. © 2017 by the authors.

  • 15.
    Garcia-Loro, F.
    et al.
    Spanish University for Distance Education (UNED), ESP.
    Cristobal, E. S.
    Spanish University for Distance Education (UNED), ESP.
    Diaz, G.
    Spanish University for Distance Education (UNED), ESP.
    MacHo, A.
    Spanish University for Distance Education (UNED), ESP.
    Baizan, P.
    Spanish University for Distance Education (UNED), ESP.
    Blazquez, M.
    Spanish University for Distance Education (UNED), ESP.
    Castro, M.
    Spanish University for Distance Education (UNED), ESP.
    Plaza, P.
    Spanish University for Distance Education (UNED), ESP.
    Orduna, P.
    DeustoTech LabsLand, ESP.
    Auer, M.
    International Association of Online Engineering (IAOE), AUT.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nilsson, Kristian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Fidalgo, A.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Alves, G.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Marques, A.
    School of Engineering of Polytechnic of Porto (ISEP), PRT.
    Hernandez-Jayo, U.
    University of Deusto, Bibao, ESP.
    Garcia-Zubia, J.
    University of Deusto, Bibao, ESP.
    Kreiter, C.
    Carinthia University of Applied Sciences (CUAS), AUT.
    Pester, A.
    Carinthia University of Applied Sciences (CUAS), AUT.
    Garcia-Hernandez, C.
    EVM, Tenerife, ESP.
    Tavio, R.
    EVM, Tenerife, ESP.
    Valtonen, K.
    OMNIA, FIN.
    Lehtikangas, E.
    OMNIA, FIN.
    PILAR: A Federation of VISIR Remote Laboratory Systems for Educational Open Activities2019Ingår i: Proceedings of 2018 IEEE International Conference on Teaching, Assessment, and Learning for Engineering, TALE 2018, Institute of Electrical and Electronics Engineers Inc. , 2019, s. 134-141Konferensbidrag (Refereegranskat)
    Abstract [en]

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

  • 16.
    Garcia-Loro, Felix
    et al.
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Macho, Alejandro
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Cristobal, Elio San
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Diaz, Gabriel
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Castro, M.
    Universidad Nacional de Educacion a Distancia, Electronics, ESP.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Gustavsson, Ingvar
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Nilsson, Kristian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Fidalgo, André V.
    Polytechnic of Porto, PRT.
    Alves, Gustavo
    Polytechnic of Porto, PRT.
    Marques, Arcelina
    Polytechnic of Porto, PRT.
    Hernandez-Jayo, Unai
    Universidad de Deusto, ESP.
    Garcia-Zubia, Javier
    Universidad de Deusto, ESP.
    Kreiter, Christian
    Fachhochshule Technikum Karnten, AUT.
    Oros, Ramona Georgiana
    Fachhochshule Technikum Karnten, AUT.
    Pester, A.
    Fachhochshule Technikum Karnten, AUT.
    Garbi-Zutin, Danilo
    International Association of Online Engineering (IAOE), AUT.
    Auer, Michael E.
    International Association of Online Engineering (IAOE), AUT.
    Garcia-Hernandez, Carla
    EVM., Tenerife, ESP.
    Tavio, Ricardo
    EVM., Tenerife, ESP.
    Valtonen, Kati
    OMNIA, Helsinki, FIN.
    Lehtikangas, Elina
    OMNIA, Helsinki, FIN.
    Experimenting in PILAR federation: A common path for the future2018Ingår i: PROCEEDINGS OF 2018 IEEE GLOBAL ENGINEERING EDUCATION CONFERENCE (EDUCON) - EMERGING TRENDS AND CHALLENGES OF ENGINEERING EDUCATION, IEEE Computer Society , 2018, s. 1518-1523Konferensbidrag (Refereegranskat)
    Abstract [en]

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

  • 17.
    Gradolewski, Dawid
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Magenes, Giovanni
    Univ Pavia, ITA.
    Johansson, Sven
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    A Wavelet Transform-Based Neural Network Denoising Algorithm for Mobile Phonocardiography2019Ingår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, nr 4, artikel-id 957Artikel i tidskrift (Refereegranskat)
    Abstract [en]

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

  • 18.
    Gunnarsson, Jenny
    et al.
    Blekinge Tekniska Högskola, Biblioteket.
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Pettersson, Anette
    Blekinge Tekniska Högskola, Biblioteket.
    Teaching International Students How to Avoid Plagiarism: Librarians and Faculty in Collaboration2014Ingår i: The journal of academic librarianship, ISSN 0099-1333, E-ISSN 1879-1999, Vol. 40, nr 3/4Artikel i tidskrift (Refereegranskat)
    Abstract [en]

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

  • 19.
    Hultgren, Anders
    et al.
    Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för elektroteknik.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, Avdelningen för elektroteknik.
    Nilsson, Magnus
    Walther, Björn
    Integration av matematik och teknik på ingenjörsutbildningar2009Konferensbidrag (Refereegranskat)
    Abstract [sv]

    I detta bidrag presenterar vi en uppläggning av integrerade kurser i matematik och tillämpningar, vilken använts inom högskoleingenjörsutbildningen vid Högskolan i Kalmar. Kursverksamheten, som bedrivs inom ramen för kurspaketet ingenjörsvetenskap, tillgodoser såväl behovet av att betona matematikens roll som ett generellt och abstrakt verktyg för problemlösning som behovet av att ge studenterna bra baskunskaper i matematik i anslutning till möjliga tillämpningsområden.

  • 20. Hultgren, Anders
    et al.
    Nilsson, Magnus
    Kulesza, Wlodek
    Walther, Björn
    Integration av matematik och teknik på ingenjörsutbildningar2008Konferensbidrag (Övrigt vetenskapligt)
    Abstract [sv]

    I detta bidrag presenterar vi en uppläggning av integrerade kurser i matematik och tillämpningar, vilken använts inom högskoleingenjörsutbildningen vid Högskolan i Kalmar. Kursverksamheten, som bedrivs inom ramen för kurspaketet ingenjörsvetenskap, tillgodoser såväl behovet av att betona matematikens roll som ett generellt och abstrakt verktyg för problemlösning som behovet av att ge studenterna bra baskunskaper i matematik i anslutning till möjliga tillämpningsområden.

  • 21. Jachimczyk, B.
    et al.
    Dziak, D.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance improvement of NN based RTLS by customization of NN structure: Heuristic approach2015Ingår i: Proceedings of the International Conference on Sensing Technology, ICST, IEEE Computer Society, 2015, s. 278-283Konferensbidrag (Refereegranskat)
    Abstract [en]

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

  • 22.
    Jachimczyk, Bartosz
    et al.
    BetterSolutions S.A., POL.
    Dziak, Damian
    Politechnika Gdanska, POL.
    Czapla, Jacek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Damps, Pawel
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    IoT on-board system for driving style assessment2018Ingår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 18, nr 4, artikel-id 1233Artikel i tidskrift (Refereegranskat)
    Abstract [en]

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

  • 23.
    Jachimczyk, Bartosz
    et al.
    BetterSolutions, POL.
    Dziak, Damian
    Politechnika Gdanska, POL.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Customization of UWB 3D-RTLS based on the new uncertainty model of the AoA ranging technique2017Ingår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 17, nr 2, artikel-id 227Artikel i tidskrift (Refereegranskat)
    Abstract [en]

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

  • 24. Jachimczyk, Bartosz
    et al.
    Dziak, Damian
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Using the fingerprinting method to customize RTLS based on the AoA ranging technique2016Ingår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 16, nr 6, artikel-id 876Artikel i tidskrift (Refereegranskat)
    Abstract [en]

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

  • 25. Jachimczyk, Bartosz
    et al.
    Dziak, Damian
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Performance analysis of an RFID-based 3D indoor positioning system combining scene analysis and neural network methods2013Ingår i: Scientific Papers of Faculty of Electrical and Control Engineering Gdansk University of Technology, ISSN 1425-5766, nr 34, s. 29-33Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

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

  • 26. Jachimczyk, Bartosz
    et al.
    Dziak, Damian
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    RFID: Hybrid Scene Analysis-Neural Network System for 3D Indoor Positioning optimal system arrangement approach2014Konferensbidrag (Refereegranskat)
    Abstract [en]

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

  • 27.
    Jarzebowicz, Leszel
    et al.
    Gdansk Univ. Technol., POL.
    Karwowski, Krzysztof
    Gdansk Univ. Technol., POL.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Sensorless algorithm for sustaining controllability of IPMSM drive in electric vehicle after resolver fault2017Ingår i: Control Engineering Practice, ISSN 0967-0661, E-ISSN 1873-6939, Vol. 58, s. 117-126Artikel i tidskrift (Refereegranskat)
    Abstract [en]

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

  • 28.
    Javadi, Mohammad Saleh
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Dahl, Mattias
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Pettersson, Mats
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Design of a video-based vehicle speed measurement system: an uncertainty approach2019Ingår i: 2018 Joint 7th International Conference on Informatics, Electronics & Vision (ICIEV) and 2018 2nd International Conference on Imaging, Vision & Pattern Recognition (icIVPR), Kitakyushu, Japan, 2018, pp. 44-49., IEEE, 2019, artikel-id 8640964Konferensbidrag (Refereegranskat)
    Abstract [en]

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

  • 29. Kulesza, Wlodek
    Principles of Measurement System Modelling, Identification and Validation: Aspects of In-situ Real Time Self-tests2009Ingår i: Metrologia:dzis i jutro / [ed] Kicinski, W.; Swedrowski, L., Gdansk: Technical University of Gdansk , 2009, s. 21-30Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The paper focuses on a design of in-situ real time system self-tests of a measurement system. The approach is based on principles of system modelling, pattern identification and validation with several methods presented. These involve several of the aspects of test signals and the design principles are illustrated in two case studies, one in the time domain and the second in the frequency domain. The paper also highlights the significance of rapid prototyping tools. The analysis can be useful as a methodological guide in designing smart sensors with an in-build self-test function.

  • 30. Kulesza, Wlodek
    Wireless Sensor Networks – Measurement, Telecommunication and Energy Approach2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    The wireless sensor networks, which development has begun by military applications, is applied in all human activities; in medicine for patience monitoring, in huge scale environmental monitoring e.g. to reduce the effects of disasters, and even many industrial and everyday applications. Nowadays the area of wireless sensor networks, WSNs is one of the emerging and fast growing fields in the scientific world. This has brought about developing low cost, low-power and multi-function sensor nodes. However, the major fact that sensor nodes run out of energy quickly has been an issue and many energy efficient routing protocols have been proposed to solve this problem and preserve the longevity of the network. This is the reason why routing techniques in wireless sensor network focus mainly on the accomplishment of power conservation. Most of the recent publications have shown many protocols mainly designed to minimize energy consumption in sensor networks. Fast development of wireless sensor networks can also be challenging for a designer, not only due to solution and structure complexities, but first of all due to demanding requirements. Case studies of WSN design are presented in the paper. A hierarchical routing technique which shows energy efficiency has been validated. The technique selects cluster head with highest residual energy in each communication round of transmission but it also takes into account, the shortest distance to the base station from the cluster heads. Simulation results show that hierarchical routing technique with different level of hierarchy prolongs the lifetime of the network compared to other clustering schemes and the residual energy mean value, after some communication rounds of simulation, increases significantly. The presented case study shows the advantages of hierarchical WSN structure. The advantages are validated by comparative studies. The analysis shows that energy efficiency of WSNs can be further improved. For instance the clusters formed dynamically on base of shortest distance to initial cluster head affects the network lifetime of WSN.

  • 31. Kulesza, Wlodek
    et al.
    Chen, Jiandan
    Khatibi, Siamak
    Arrangement of a Multi Stereo Visual Sensor System for a Human Activities Space2008Ingår i: Stereo Vision / [ed] Bhatti, Asim, Vienna: InTech Education and Publishing , 2008, s. 152-172Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    The first part of this chapter introduces a mathematical geometry model which is used to analyze the iso-disparity surface. This model can be used to dynamically adjust the positions, poses and baseline lengths of multiple stereo pairs of cameras in 3D space in order to get sufficient visibility and accuracy for surveillance, tracking and 3D reconstruction. The depth reconstruction accuracy is quantitatively analyzed by the proposed model. The proposed iso-disparity mathematical model presents possibility of reliable control of the iso-disparity curves’ shapes and intervals by applying the systems configuration and target properties. In the second part of this chapter, the key factors affecting the accuracy of 3D reconstruction are analysed. It shows that the convergence angle and target distance influence the depth reconstruction accuracy most significantly. The depth accuracy constraints are implemented in the model to control the stereo pair’s baseline length, position and pose. It guarantees a certain accuracy in the 3D reconstruction. The reconstruction accuracy is verified by a cubic reconstruction method. The optimization is implemented by applying the camera, object and stereo pair constraints into the integer linear programming.

  • 32.
    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 students2014Ingår i: The Scientific Papers of Faculty of Electrical and Control Engineering Gdańsk University of Technology, ISSN 1425-5766, nr 27, s. 27-32Artikel i tidskrift (Refereegranskat)
    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.

  • 33. Kulesza, Wlodek
    et al.
    Wirandi, Jenny
    Lauber, Alexander
    Modeling of Industrial Measurement Systems Considering the Human Factor2006Konferensbidrag (Refereegranskat)
  • 34. Mustafa, Wail
    et al.
    Yu, Jhang Shih
    Rakus-Andersson, Elisabeth
    Mohammed, Abbas
    Kulesza, Wlodek
    Fuzzy-based Opportunistic Power Control Strategy in Cognitive Radio Networks2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper considers the spectrum sharing network consisting of a pair of primary users (PUs) and a pair of cognitive users (CRs) in a fading channel. The pair of PUs establishes a wireless link as the PU link. The pair of CRs establishes a wireless link as the CR link. The PU link and CR link utilize spectrum simultaneously with different priorities. The PU link has a higher priority to utilize spectrum with respect to the CR link. When the PU link utilizes spectrum, a desired quality of service (QoS) is given to be assured and the CR utilizes spectrum with an opportunistic power scale under this constraint, assuring the desired QoS on the PU link. To compute an optimal opportunistic power scale for the CR link, a fuzzy-based opportunistic power control strategy is proposed based on the Mamdani fuzzy control model using two input variables: the PU’s SNR and PU’s interference channel gain. By the proposed fuzzy-based power control strategy, the desired QoS could be assured on the PU link and the bit error rate (BER) is also reduced compared with the spectrum sharing network without power control strategy.

  • 35.
    Qi, Hongye
    et al.
    Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Jiangsu, Peoples R China..
    Liu, Leilei
    Nanjing Univ Posts & Telecommun, Nanjing 210093, Jiangsu, Peoples R China..
    Yin, Xiaoxing
    Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Jiangsu, Peoples R China..
    Zhao, Hongxin
    Southeast Univ, State Key Lab Millimeter Waves, Nanjing 210096, Jiangsu, Peoples R China..
    Kulesza, Wlodek
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    Mutual Coupling Suppression Between Two Closely Spaced Microstrip Antennas With an Asymmetrical Coplanar Strip Wall2016Ingår i: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 15, s. 191-194Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This letter describes an asymmetrical coplanar strip (ACPS) wall to suppress the mutual coupling between two closely spaced 5.8-GHz microstrip antennas. The ACPS wall, which is inserted vertically between the two antennas, introduces an additional coupling path to reduce the antenna coupling, occupying just a small area between the two antennas. The decoupling effect of the proposed structure is verified by the simulation and measurement. The experimental results show that the achieved isolation is better than 35 dB and reaches a maximum of 54.3 dB at 5.8 GHz, with an extremely close antenna distance of 0.03 lambda(0) (edge-to-edge distance). The measured patterns indicate that the proposed structure also improves the radiation of the microstrip antenna.

  • 36. Tao, Zhi
    et al.
    Zhang, Xiao-Jun
    Zhao, He-Ming
    Kulesza, Wlodek
    Noise Reduction in Whisper Speech Based On the Auditory Masking Model2010Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents the issue of whispered speech enhancement. Based on multi-band spectral subtraction method where the introduced musical residual noise occurs, the proposed approach performs parametric subtraction according to the WSS (Whispered Sensitive Scale) method that is particular for whispered speech processing and auditory masking model. The algorithm is characterized by a tradeoff mechanism between the amount of the whispered speech distortion, noise reduction, and the level of musical residual noise, which are determined by appropriate adjusting the subtraction parameters. Compared with traditional subtractive-type algorithms, the proposed method results in a significant reduction of musical residual noise. Finally, objective and subjective evaluations are implemented illustrating the improvements over traditional subtractive-type algorithms.

  • 37.
    Turzynski, Marek
    et al.
    Gdansk Univ Technol, Fac Elect & Control Engn, PL-80233 Gdansk, Poland..
    Kulesza, Wlodek J.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för tillämpad signalbehandling.
    A Simplified Behavioral MOSFET Model Based on Parameters Extraction for Circuit Simulations2016Ingår i: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 31, nr 4, s. 3096-3105Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents results on behavior modeling of a general purpose metal-oxide-semiconductor field-effect transistor (MOSFET) for simulation of power electronics systems requiring accuracy both in steady state and in switching conditions. Methods of parameters extraction, including nonlinearity of parasitic capacitances and steady-state characteristics, are based on manufacturer datasheet and externally measurable characteristics. The MOSFET template is written in the MAST language and simulated in the SABER simulator. Experimental validation of the N-channel power MOSFET-type IRFP240 (Fairchild Semiconductor) rated at 20 A/200 V is performed in a dc/dc boost converter. The main features of the developed model have been compared with the properties of an analytical MOSFET model and a general MOSFET model embedded to a SABER simulator.

  • 38. Wirandi, Jenny
    et al.
    Chen, Jiandan
    Kulesza, Wlodek
    An Adaptive Model of the Fuzzy Variable: Quality Index2007Konferensbidrag (Refereegranskat)
  • 39. Wirandi, Jenny
    et al.
    Chen, Jiandan
    Kulesza, Wlodek
    An Adaptive Quality Assessment System-Aspect of Human Factor and Measurement Uncertainty2009Ingår i: IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, IEEE , 2009, Vol. 58, nr 1, s. 68-75Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, we discuss a model of quality that makes use of the fuzzily defined variable approach to better understand the concept and, thus, enables the further development of this variable. We propose a general method that may estimate a quality index (QI) that handles both qualitative and quantitative issues. The system further uses a neural network since the system learns how to integrate human factors into a quantitative QI. In our case study, we have examined the measurement of image quality and proposed a theoretical model of pulp quality.

  • 40. Wirandi, Jenny
    et al.
    Kulesza, Wlodek
    Lauber, Alexander
    Human Factor Validation in an Industrial Measurement System2008Ingår i: Measurement, ISSN 0263-2241, E-ISSN 1873-412X, Vol. 41, nr 6, s. 705-718Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The object of this study is to determine how people interpret measurement data; which factors influence their interpretation and which do not. This study forms part of an investigation series undertaken at the paper pulp company Södra Cell in Sweden (N = 1200 employees), the investigated parameter being "paper pulp quality". The findings presented in the study are the outcomes of a questionnaire that was repeated four times (n1 = 54, n2 = 53, n3 = 43, n4 = 38), an interview (ni = 32) and regular group discussions that included 10 people (nd = 10) and that took place once a month over a three-year period. In order to quantify the quality of the product - paper pulp - different measurements must be combined. This study reveals that different employees prefer different parameters for the quantification of paper pulp quality. This study furthermore shows that there is a correlation between the employees' choice of parameters and their belonging to a particular pulp mill within the company. We also found that external factors, e.g. the opinion of authorities, affected which parameters were favoured when product quality was determined. Furthermore, the data analysis indicates that there is a correlation between the job-position of employees and the way they interpret measurement data related to product quality. Controllers and operators make similar judgments, with the exception of chemists whose opinions appear to deviate. However, the greatest variation found in the study is related to the individual person - independently of education or physical or psychological condition. The study finally proposes a number of preventive measures to improve the uniformity and reliability of measurements conducted at a process company, the most important of which is improved education of all employees who are in a position to influence product quality. © 2007 Elsevier Ltd. All rights reserved.

  • 41. Wirandi, Jenny
    et al.
    Kulesza, Wlodek
    Lauber, Alexander
    The problem of applying modern uncertainty concepts to the measurement of instrument specific parameters2006Ingår i: IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, E-ISSN 1557-9662, Vol. 55, nr 3, s. 700-705Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a number of problems that occur when applying the Guide to the Expression of Uncertainty in Measurement (GUM) to modern instruments. These instruments are often automatic, which makes it complicated to evaluate the uncertainty components in each measurement step because it is difficult to control and analyze them. Many of these instruments try to quantify instrument-specific parameters, which are difficult to compare with others that have the same dimension but are measured using other techniques. Often, these parameters lack traceable calibration, which may result in a large uncertainty component. This paper also considers the human aspect of the measurement process.

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