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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Aleksandra Kawala-Janik Michal Podpora Jerzy Baranowski Waldemar Bauer Mariusz Pelc Faculty of Electrical Engineering Automatic Control and Informatics Opole University of Technology Opole Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland Old Royal Naval College University of Greenwich London U.K.

In this paper comparison of the two innovative signal processing methods for analysis of both EEG and EMG biomedical signals is in short presented. The reason for that is caused by the fact, that nowadays the broad analysis of various biomedical signals is extremely popular. The first method presented in this paper relies on kernel density estimators application. Implementation of such method enables construction of densitograms for the examined bio-signals. One of the biggest advantages of this method is that it allows to obtain statistically filtered signals, which results in making the whole signal processing task significantly quicker. The second method described in this paper is based on basic mathematical operations only. Despite its simplicity the whole process can be implemented on almost any hardware platform, including those with very limited computational capabilities. Also it makes the task quick. In accordance with the conducted experiments - the method is also efficient and as it can also be implemented on embedded platform and the algorithm can be rewritten in any programming language, the potential application of this method is wide.

关键词： Electroencephalography Electromyography Electrodes Signal processing Educational institutions Headphones Hardware

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Embedding of Nonlinear Systems in a Linear Parameter-Varying Representation

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IFAC Proceedings Volumes 2014年第3期47卷 6907-6913页

作者： Hossam S. Abbas Roland Tóth Mihály Petreczky Nader Meskin Javad Mohammadpour Department of Electrical Engineering College of Engineering Qatar University PO Box 2713 Doha Qatar Electrical Engineering Department Faculty of Engineering Assiut University Assiut Egypt Control Systems Group Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands Department of Computer Science and Automatic Control Ecole des Mines de Douai 59508 Douai France Intelligent Control Systems Lab College of Engineering The University of Georgia Athens GA 30602 USA

This paper introduces a systematic approach to synthesize linear parameter-varying (LPV) representations of nonlinear (NL) systems which are originally defined by control affine state-space representations. The conversion approach results in LPV state-space representations in the observable canonical form. Based on the relative degree concept of NL systems, the states of a given NL representation are transformed to new coordinates that provide its normal form. In the SISO case, all nonlinearities of the original system are embedded in one NL function which is factorized to construct the LPV form. An algorithms is proposed for this purpose. The resulting transformation yields an LPV model where the scheduling parameter depends on the derivatives of the inputs and outputs of the system. In addition, if the states of the NL model can be measured or estimated, then the procedure can be modified to provide LPV models scheduled by these states. Examples are included for illustration.

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Reliability of statistic evaluation of microscopic pictures taken from knitted fabrics

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Journal of Physics: Conference Series 2015年第1期633卷

作者： A Ehrmann T Blachowicz H Zghidi M O Weber Faculty of Engineering Sciences and Mathematics Bielefeld University of Applied Sciences 33609 Bielefeld Germany Institute of Physics - Center for Science and Education Silesian University of Technology 44-100 Gliwice Poland Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology 44-100 Gliwice Poland Faculty of Textile and Clothing Technology Niederrhein University of Applied Sciences 41065 Mönchengladbach Germany

One of the techniques which can be used to quantitatively evaluate images statistically is the so-called random-walk approach. The resulting Hurst exponent is a measure of the complexity of the picture. Especially long, fine elements in the image, such as fibres, influence the Hurst exponent significantly. Thus, determination of the Hurst exponent has been suggested as new method to measure the hairiness of yarns or knitted fabrics, since existing hairiness measurement instruments are based on different measurement principles which are not comparable. While the principal usability of this method for hairiness detection has been shown in former projects, the absolute value of the calculated Hurst exponents depends on the technique to take the photographic image of a sample, to transfer it into a monochrome picture, and on possible image processing steps. This article gives an overview of edge detection filters, possible definitions of the threshold value between black and white for the transformation into a monochrome image, etc. It shows how these parameters should be chosen in case of typical textile samples and correlates the challenges of this novel method with well-known problems of common techniques to measure yarn and fabric hairiness.

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Evaluation of the spherical concave mirror and convex lens in compensating turbulence effect on FSO systems

Evaluation of the spherical concave mirror and convex lens i...

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International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： M. Hulea Z. Ghassemlooy S. Rajbhandari X. Tang Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Romania Optical Communications Research Group Northumbria University Newcastle United Kingdom Department of Engineering Science University of Oxford United Kingdom Tsinghua University Beijing China

This paper focuses on evaluating the performance of two aperture averaging methods used for compensating the effects of the air turbulence in free space optical (FSO) communications. These methods are based on using a concentration lens and spherical concave mirrors (SCM). The preliminary experimental results show that the quality of the received signal in terms of the Q-factor and the scintillation index is moderately improved when employing a lens in comparison to SCM for all turbulence regimes. However, these results were obtained with different collection areas and focal points. Therefore, a more rigorous approach using lens and SCM with the same aperture diameters and focal lengths needs to be adopted to ensure conclusive results.

关键词： Laser beams Lenses Optical beams Apertures Optical fiber communication Mirrors Receivers

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The influence of ultrasound signal parameters on sonoluminescence light intensity

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Archives of Electrical engineering 2013年第4期62卷 605-612页

作者： Szmechta, Marek Boczar, Tomasz Zmarzly, Dariusz Faculty of Electrical Engineering Automatic Control and Computer Science Institute of Electric Power Engineering Opole University of Technology Prószkowska 76 45-758 Opole Poland

Topics of this article concern the study of the fundamental nature of the sonoluminescence phenomenon occurring in liquids. At the Institute of Electrical Power engineering at Opole University of Technology the interest in that phenomenon known as secondary phenomenon of cavitation caused by ultrasound became the genesis of a research project concerning acoustic cavitation in mineral insulation oils in which a number of additional experiments performed in the laboratory aimed to determine the influence of a number of acoustic parameters on the process of the studied phenomenona. The main purpose of scientific research subject undertaken was to determine the relationship between the generation of partial discharges in high-voltage power transformer insulation systems, the issue of gas bubbles in transformer oils and the generated acoustic emission signals. It should be noted that currently in the standard approach, the phenomenon of generation of acoustic waves accompanying the occurrence of partial discharges is generally treated as a secondary phenomenon, but it can also be a source of many other related phenomena. Based on our review of the literature data on those referred subjects taken, it must be noted, that this problem has not been clearly resolved, and the description of the relationship between these phenomena is still an open question. This study doesn't prove all in line with the objective of the study, but can be an inspiration for new research project in the future in this topic. Solution of this problem could be a step forward in the diagnostics of insulation systems for electrical power devices based on non-invasive acoustic emission method.

关键词： Sonoluminescence

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Segmentation of cell nuclei within chained structures in microscopic images of colon sections

Segmentation of cell nuclei within chained structures in mic...

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27th Spring Conference on computer Graphics, SCCG 2011

作者： Smochina, Cristian Serban, Anca Manta, Vasile Faculty of Automatic Control and Computer Engineering Gh. Asachi Technical University Iasi Romania

ISBN: (纸本)9781450319782

In this paper we focus on the segmentation problem of specific chained configurations in images taken from colon tissues. The proposed technique uses a priori information about the general structure and the relationship between epithelial cells nuclei and encapsulates the human behaviour on the critical regions between nuclei. After the background detection is performed, the points with high concavity from the boundaries of the nuclei structures are detected. A set of templates and rules are established by analysing the inter-nuclei regions. These rules are used to validate and to pair the concave points so that their connecting lines to indicate the separation regions between nuclei. The evaluation of the proposed method is made with precision, recall and accuracy measures. © 2011 ACM.

关键词： Image segmentation

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Data hiding using steganography

Data hiding using steganography

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2013 IEEE 12th International Symposium on Parallel and Distributed Computing, ISPDC 2013

作者： DǍgǍdiţǍ, Monica Adriana Sluşanschi, Emil Ioan Dobre, RǍzvan University Politehnica of Bucharest Faculty of Automatic Control and Computers Computer Science and Engineering Department Romania

ISBN: (纸本)9780769550183

It is a truth universally acknowledged that 'a picture is worth a thousand words'. The emerge of digital media has taken this saying to a complete new level. By using steganography, one can hide not only 1000, but thousands of words even in an average sized image. This article presents various types of techniques used by modern digital steganography, as well as the implementation of the least significant bit (LSB) method. The main objective is to develop an application that uses LSB insertion in order to encode data into a cover image. Both a serial and parallel version are proposed and an analysis of the performances is made using images ranging from 1:9 to 131 megapixels. © 2013 IEEE.

关键词： Steganography

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Image vectorization on modern architectures

Image vectorization on modern architectures

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2013 IEEE 9th International Conference on Intelligent computer Communication and Processing, ICCP 2013

作者： Slusanschi, Emil Lupescu, Grigore Computer Science and Engineering Departament Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781479914937

This work presents an image vectorization application aimed to exploit features found in most of today's modern architectures. Design decisions supported by performance results are presented along with use cases for the proposed solution. We will present the algorithm, the target architectures and threading models, as well as a number of optimization techniques. Finally results of both low power SoC and high performance multicore processors are discussed. © 2013 IEEE.

关键词： System-on-chip

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Neural network approximations of solution concepts for multiagent coalitions

Neural network approximations of solution concepts for multi...

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2013 IEEE 12th International Symposium on Parallel and Distributed Computing, ISPDC 2013

作者： Leon, Florin Burlacu, Andrei Marius Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iaşi Iaşi Romania

ISBN: (纸本)9780769550183

Coalition formation is an important aspect of multiagent systems because it enables agents to achieve goals more efficiently or goals they cannot accomplish individually. In this paper we consider an approximate method based on neural networks to estimate two important values used for dividing the payoff of a coalition, namely the Shapley value and the nucleolus. We try several neural network topologies and different training algorithms and evaluate the behavior of an especially designed multiagent system when the payoff values are computed by exact and approximate methods. © 2013 IEEE.

关键词： Multi agent systems

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Hardware acceleration in ceph distributed file system

Hardware acceleration in ceph distributed file system

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2013 IEEE 12th International Symposium on Parallel and Distributed Computing, ISPDC 2013

作者： Andrei, Pistirica Sorin Florica, Moldoveanu Alin, Moldoveanu Victor, Asavei Claudiu, Caraman Mihai Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest Romania Faculty of Electrical Engineering and Computer Science Transylvania University of Brasov Brasov Romania

ISBN: (纸本)9780769550183

Cloud computing becomes more and more popular providing the means to organize and deliver almost any kind of data and software services. Since it is inherently scalable to support rapid economic growth and productivity, its distributed data storage layer needs to be capable to address these requirements. A distributed file system contains a large number of cluster nodes and a large number of clients interacting with it. In this article, we propose two acceleration mechanisms based on multi-core network SoC to maximize each cluster node performance. First, the requests to the cluster node are balanced evenly on the platform cores, and second the requests are classified to decrease latency of sensitive operations and improve the overall cluster responsiveness and availability. For implementation, tests and measurements we have used a novel open source distributed file system: Ceph. Among many advantages over the competitors of Ceph we mention preservation of POSIX API, completely decoupled data and metadata and usage of object storage devices instead of block devices. © 2013 IEEE.

关键词： System-on-chip

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