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41st International Congress and Exposition on Noise control engineering 2012, INTER-NOISE 2012

作者： Boczar, Tomasz Cichoń, Andrzej Borucki, Sebastian Zmarzly, Dariusz Automatic Control and Computer Science Institute of Electric Power Engineering Opole University of Technology ul. Proszkowska 76 45-758 Opole Poland

ISBN: (纸本)9781627485609

The subject matter of the paper refers to the improvement of the acoustic emission (AE) method used in diagnostics of insulation systems of electric power devices. During measurements of the AE pulses that are generated by partial discharges (PDs) in the insulation of electric power devices, there appear diverse kinds of interfering signals. These disturbances, occurring during measurements in laboratory as well as under industrial conditions, can be generated by sources placed inside the electric power device under study or/and by sources emitting in its surrounding. The sources mentioned can be physical phenomena of mechanical, electric or acoustic nature. If the disturbances appear at the same time during measurements as the AE pulses generated by PDs this can cause deformation of the gathered time-runs. This can have direct influence on the proper interpretation of the measurement results obtained by use of the AE method. Hence, the necessity of the influence estimation of the interfering signals on the by PDs generated AE pulses time-runs. The performed research works consider the following issues: The measurements and analysis of the acoustic disturbances generated by corona discharges in the overhead electric power transmission line.

关键词： Partial discharges

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The possibilities of using acoustic signals generated by the on load tap changer

The possibilities of using acoustic signals generated by the...

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41st International Congress and Exposition on Noise control engineering 2012, INTER-NOISE 2012

作者： Cichoń, Andrzej Borucki, Sebastian Boczar, Tomasz Zmarzly, Dariusz Automatic Control and Computer Science Institute of Electric Power Engineering Opole University of Technology ul. Proszkowska 76 45-758 Opole Poland

ISBN: (纸本)9781627485609

An important part of electric power transformer is the on load tap changer (OLTC) which enables for voltage regulation in the network. Due to high level of failure frequency of these devices it is necessarily to look for new diagnostic methods which enable for theirs technical state estimation under transformer normal operating condition. Presently at the electric Power Institute at Opole University of Technology there are works in progress aspiring to determine the application possibility of the AE method for OLTC diagnosis. Results of scientifically-research works aiming to characterize the acoustic emission (AE) signals generated by OLTC constructed from a separated selector and a power switch are presented in the paper. AE signals generated during the whole OLTC joining cycle are presented. Within the signal four characteristic acoustic structures have been enhanced which regard to succeeding stages of the joining process. AE signals generated by the selector and by the power switch have been analyzed in detail. Analysis of the timefrequency components of signals generated by OLTC has been carried out with the short time Fourier transform (STFT) and continuous wavelet transform (CWT).

关键词： Voltage regulators

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Towards safe physical human-robot interaction: An online optimal control scheme

Towards safe physical human-robot interaction: An online opt...

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2012 21st IEEE International Symposium on Robot and Human Interactive Communication, RO-MAN 2012

作者： Norouzzadeh, Sholeh Lorenz, Tamara Hirche, Sandra Institute of Automatic Control Engineering Faculty of Electrical Engineering and Computer Science Technische Universität München 80290 Munich Germany Experimental Psychology Ludwig-Maximilians Universität Munich Germany

ISBN: (纸本)9781467346054

Operating in the proximity of humans has been a long-term challenge in robotics research. To achieve this objective, one of the main issues is to ensure safe and comfortable physical human-robot interaction (pHRI). In this paper, we tackle the safety problem at the control level. To ensure operation is within perceived safe zone, we use model predictive control, which finds the optimal control signal online, while imposing predefined safety constraints on the robotic system. The strength of this method lies in allowing the system to perform close to, or at the edge of the constraints' boundaries. In contrast to other works we consider here perceived safety;the constraints for perceived safety are derived in a competitive pHRI experiment. The perceived safety and comfort of the proposed approach is then evaluated with a second, game-like pHRI experiment. © 2012 IEEE.

关键词： Model predictive control

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Spatio-temporal error concealment algorithms for encoded video streams for real-time applications

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International Journal of computers and Applications 2012年第2期34卷 105-118页

作者： Sarhan, Amany Mahmoud, Rasha O. Faheem, Mohamed T. Computers and Automatic Control Engineering Department Faculty of Engineering Tanta University Egypt Computer Science Department Nile Institute of Commerce and Computer Technology Mansoura Egypt Computers and Automatic Control Engineering Department Faculty of Engineering Taief University Saudi Arabia

Multimedia is one of the most important aspects of the information era. With the advent of the multimedia age and the spread of Internet, video storage and streaming has been gaining a lot of popularity. When transmitting compressed video over a data network channel errors affect the decoding process. Video transmission puts constraints on data rate, computational complexity and delay. Unreliable channels add more challenges to this task as compressed video is extremely vulnerable to transmission errors. Problems arising from imperfect transmission of block coded video frame sequence result in lost blocks. This paper presents and implements a set of decoder side spatio-temporal algorithms that aim to enhance the speed and quality of the error concealment process. The results obtained by these algorithms are much faster and achieve better performance compared to the existing algorithms, which make them more suitable for real-time applications.

关键词： Image communication systems

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Estimation of parameters of selected converter drives

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Archives of electrical engineering 2012年第4期61卷 533-565页

作者： Beniak, Ryszard Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Sosnkowskiego 31 45-272 Opole Poland

The paper presents a method for estimation of converter drive parameters. This estimation encompassed three types of drives, i.e. a static Scherbius drive, a drive with a brushless direct current (BLDC) motor and a drive with a voltage inverter. For drive modelling and parameter estimation, the author implemented original programmes written in FORTRAN. As well as these, the paper describes an objective function applied for the estimation. The author also compares gradient and gradientless methods, which are applied for minimization of the objective function. Finally, the author explains the estimation results for example drives, focusing on the coincidence of theoretical and empirical waveforms. The abovementioned procedure led to the general rule, which facilitates estimation efficiency.

关键词： Parameter estimation

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Admissible modeling disturbances for the control of a road sector

Admissible modeling disturbances for the control of a road s...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Catalin Dimon Dumitru Popescu Department of Automatic Control and Systems Engineering Faculty of Automatics and Computer Science University Politehnica of Bucharest Bucharest Romania

Usually when modeling a real process the effects of nonlinearities must be taken into account. A road traffic sector is one such process. Considering it from a macroscopic point of view, the sector is modeled both as a nonlinear and as a linearized process. An 110 model is proposed and a RST control algorithm is used to ensure the imposed performances for the closed loop system. The robustness of the system is obtained by determining the modulus margin and based upon it the admissible nonlinearities are analyzed in order to determine the limits between which the system maintains its stability.

关键词： Analytical models Robustness

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The wireless system for EGG signal acquisition

The wireless system for EGG signal acquisition

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Dariusz Komorowski Stanislaw Pietraszek Damian Grzechca Faculty of Biomedical Engineering Silesian University of Technology Gliwice Poland Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland

The paper provides a case study on the wireless circuit for the purpose of the EGG (Electrogastrography) signal acquisition. The authors present an amplifier based on the ADS1298, wireless communication module (Bluetooth) and the microprocessor unit which have been recently built. The system is currently under examination but the outcome is very promising because the amplifier input is fed with the pure signal, i.e. no high/low pass filter is applied, that is a novelty. The system presented in this paper could be helpful in diagnosis gastric disorders in noninvasive way. It could determine patients with unexplained nausea, vomiting and other dyspeptic symptoms. The unit is under clinical trials tests and preliminary evaluation indicates acceptance by medical staff. Additional advantages are the relatively low cost of manufacture and the possibility of application remotely (pervasive computing).

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A comparison of particle swarm optimization and differential ant stigmergy algorithm

A comparison of particle swarm optimization and differential...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： A. E. Şerbencu A. Şerbencu Control Systems and Electrical Engineering Departament Automatic Computer Science Electrical and Electronic Engineering Faculty Dunãrea de Jos Galati University Romania

Differential Ant Stigmergy Algorithm (DASA) is a recent meta-heuristic method which represents an adaptation of Ant Colony Optimization (ACO) to continuous optimization problems. Other adaptations of ACO to continuous optimization exist but DASA seems to be very efficient for the class of highdimension real-parameters optimization problems, becoming a competitor to more classical methods such as Particle Swarm Optimization (PSO). The PSO is a meta-heuristic which is also inspired from insects' life as ACO. Even both methods use a population of entities, the memory of PSO is larger as those of DASA. DASA uses just one current solution around which the population search and the difference that generated last improvement. PSO stores the previous best position and velocity of every particle. This paper attempts to examine if an elitist version of DASA has at least the same effectiveness (finding the true global solution) as PSO, but with significantly better efficiency (less function evaluation). The performance comparison of DASA and PSO is implemented using a set of six test functions well known for their difficulty.

关键词： Sociology Statistics Convergence Particle swarm optimization Benchmark testing Vectors Algorithm design and analysis

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Sentiment Analysis of Health and Nutrition Tweets using Support Vector Machines

Sentiment Analysis of Health and Nutrition Tweets using Supp...

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2012年互联网技术与应用国际学术会议

作者： Tarek Helmy Information and Computer Science Department College of Computer Science and EngineeringKing Fahd University of Petroleum and MineralsDhahran 31216Mail Box.413Saudi Arabia Faculty of Engineering Department of Computers Engineering & Automatic ControlTanta UniversityEgypt

Sentiment analysis refers to a broad area of natural language processing,computational linguistics and text mining.A successful sentiment analysis model based on Twitter,the popular social networking and micro blogging service,could provide useful information to the Internet users due to its realtime *** instance,Twitter can be a resource for people interested in staying up on diet and *** work is a part of a project where we are developing a framework for semantic manipulation of health and nutrition *** analysis and classification are keys to the intelligent search process especially in a critical area like health and nutrition. Sentiment analysis in this paper refers to the task of classifying opinionated health and nutrition tweets as either positive or negative according to the overall sentiment expressed by the *** paper presents an experimental study of using support vector machines for sentiment analysis in the health and nutrition domain of *** results demonstrate the applicability of support vector machines to Twitter sentiment analysis and emphasize the importance of preprocessing due to the unique attributes of tweets.

关键词： Sentiment Analysis and Classfication Natural Language Processing Support Vector Machines

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Fuzzy watershed algorithm: An enhanced algorithm for 2D gel electrophoresis image segmentation

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International Journal of computer science Issues 2012年第2 2-3期9卷 561-577页

作者： Rashwan, Shaheera Sarhan, Amany Faheem, Muhamed Talaat Youssef, Bayumy.A. Informatics Research Institute City for Science and Technology Borg ElArab Alexandria Egypt Computer science and Automatic Control Engineering Department Faculty of Engineeing University of Tanta Tanta Egypt EE dept-Faculty of Engineering Taif University Saudi Arabia

An important issue in the analysis of two-dimensional electrophoresis images is the detection and quantification of protein spots. The main challenges in the segmentation of 2DGE images are to separate overlapping protein spots correctly and to find the abundance of weak protein spots. To enable comparison of protein patterns between different samples, it is necessary to match the patterns so that homologous spots are identified. In this paper, we describe a new robust technique to segment and model the different spots present in the gels. The Watershed segmentation algorithm is modified to handle the problem of over segmentation by initially partitioning the image to mosaic regions using the composition of fuzzy relations. The experimental results showed the effectiveness of the proposed algorithm to overcome the over segmentation problem associated with the available algorithm. We also use a wavelet denoising function to enhance the quality of the segmented image. The parameters of the wavelet function are obtained using the Genetic Algorithm search technique. The results of using the denoising function before the proposed Fuzzy Watershed segmentation algorithm is very promising as they are better than those without denoising. © 2012 International Journal of computer science Issues.

关键词： Image segmentation

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