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Estimation of parameters of selected converter drives

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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Virtual instrumentation on mobile devices for measuring the pulse wave velocity

Virtual instrumentation on mobile devices for measuring the ...

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International Conference on Telecommunications and Signal Processing (TSP)

作者： Razvan A. Ciobotariu Criştiăln Fosalau Cristian Rotariu Faculty of Electrical Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Romania

Virtual instrumentation is one of the major development resulted from the extensive use of computers, which offers the benefits of customizable software development of user-defined tools for control, process, and visualization of data, creating versatile systems, using modular programming, intuitive and easy to use. In this paper we present the development and implementation of virtual instrumentation software for medical application running on a mobile device. We choose to develop an application that measures the Pulse Wave Velocity, due to major incidence and impact of cardiovascular diseases.

关键词： Electrocardiography Software Indexes Instruments Mobile handsets Pulse measurements Programming

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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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Wireless system for remote monitoring of atrial fibrillation

Wireless system for remote monitoring of atrial fibrillation

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European DSP Education and Research Conference (EDERC)

作者： Cristian Rotariu Dragos Arotaritei Vasile Manta Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iasi Iasi Romania Faculty of Medicine “Grigore T. Popa” University of Medicine and Pharmacy Iasi Romania

ISBN: (纸本)9781467345965

In this paper is described the design and implementation of a wireless atrial fibrillation monitoring system, for realtime remote patient monitoring in a limited area, using wireless sensor networks (WSN). The proposed system consists of a lightweight and low power wireless ECG acquisition and processing device, connected to a central monitoring station through WSN. The device is able to detect the paroxysmal atrial fibrillation episodes and transmits alerts to the central monitoring station. The system can be used for long-time continuous monitoring of patients suspected to have atrial fibrillation, as part of a diagnostic procedure, or recovery from an acute or surgical event. In order to detect the atrial fibrillation episodes we used a simple method based on RR intervals, extracted from ECG signal. We evaluated the performance of the method on MIT-BIH Atrial Fibrilation Database from Physionet. The central monitoring station runs a patient monitor application that receives the real time heart rate and atrial fibrillation alerts from WSN. A user-friendly Graphical User Interface was developed for the patient monitor application to display the heart rate and alerts coming from the monitored patient. A prototype of the system has been developed, implemented and tested.

关键词： developed implemented tested Patient Monitoring atrial fibrillation Wireless sensor networks monitor station Heart Rate Remote warning CARRIER SYSTEM WSN gene Radio diagnostic procedure

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Editorial

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Automatika 2012年第2期53卷 103-106页

作者： Martínez-Salamero, Luis Milanovič, Miro Rovira i Virgili University School of Electrical and Computer Engineering Department of Electrical Electronic and Automatic Control Engineering Spain University of Maribor Faculty of Electrical Engineering and Computer Science Institute for Robotics Slovenia

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Performance evaluation of job scheduling algorithms in P2P distributed systems

Performance evaluation of job scheduling algorithms in P2P d...

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The International Conference on Informatics and Systems (INFOS)

作者： Tarek Helmy Elsayed Sallam College of Computer Science and Engineering King Fahd University of Petroleum and Minerals Dhahran 31261 Mail Box 413 Saudi Arabia Faculty of Engineering Department of Computers & Automatic Control Engineering Tanta University Egypt

Peer-to-Peer (P2P) distributed systems have received considerable attention mainly due to their potential for high-performance and high-reliability. Job scheduling in P2P distributed systems is one of the most important issues. In this paper, we have evaluated the performance of four job scheduling algorithms named Random, Round Robin, Number of Connections and Server Load in P2P distributed computing environment. The aim of the performance evaluation is to provide a comprehensive view of what performance can be expected from these algorithms in P2P systems in terms of CPU utilization, task processing, traffic received and traffic sent at different load scenarios. We used OPNET modeler to build the simulation model for FTP application on the P2P distributed systems. The output of the performance comparison illustrates different QoS (Quality of Service) aspects of these basic algorithms under different workloads and traffic settings. The results show that the performance of each algorithm changes according to the operational environment setting. The simulation results show that the Server Load-based scheduling algorithm has the best performance among the four algorithms followed by the Number of Connections-based scheduling algorithm. Simulations also show that the Server Load scheduling policy is not suitable for heavy load situations and the Random algorithm is suitable for some settings, especially in the low load situation.

关键词： Portable document format IEEE Xplore

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Wireless remote monitoring system for patients with cardiac pacemakers

Wireless remote monitoring system for patients with cardiac ...

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International Conference and Exposition on Electrical and Power engineering (EPE)

作者： Cristian Rotariu Vasile Manta Haritan Costin Faculty of Automatic Control and Computer Engineering Gheorghe Asachi Technical University of Iasi Iasi Romania Faculty of Medical Bioengineering Grigore T. Popa University of Medicine and Pharmacy of Iasi Iasi Romania

This paper describes the design and implementation of a wireless remote monitoring system for patients with temporary cardiac pacemakers. The system is built around a low power cardiac pacemaker with wireless data transmission capability, used for patient monitoring in to a limited area. The proposed system is designed to be used in emergency situations, in healthcare institutes, helping to keep the patient's heartbeat stable. The status of each heartbeat is wirelessly transmitted to a monitoring station via a wireless sensor network. The monitoring station runs a patient monitor application that receives the data from wireless sensor network and activates the alarms when these values exceed the preset limits. An experimental wireless pacemaker was implemented and tested.

关键词： Pacemakers Wireless sensor networks Wireless communication Monitoring Batteries Heart rate

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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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