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Linear Quadratic Regulator for the Three-Phase Grid Connected Power Converter

Linear Quadratic Regulator for the Three-Phase Grid Connecte...

引用

The Second International Conference on Micro Nano Devices,Structure and Computing Systems(MNDSCS 2013)

作者： Marian Gaiceanu Dunarea de Jos University of Galati Faculty of Automatic Control Computer Science Electrical and Electronics Engineering

This paper proposes a combined power quality-optimal control of the three-phase grid connected power converter. By using the technique of decoupling control, the mathematical model of the three-phase power converter is developed in the dq rotating reference frame and it is linearized around the operating point. The optimal control problem is with free-end point, infinite time horizon, and without constraints. The proposed optimal control is obtained as a solution of the Algebraic Riccati Equation. The numerical simulations based on the Matlab/Simulink software show the validity of the proposed solution.

关键词： optimal control grid connected power inverter power quality Matlab/Simulink

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Neural Network Approximations of Solution Concepts for Multiagent Coalitions

Neural Network Approximations of Solution Concepts for Multi...

引用

International Symposium on Parallel and Distributed Computing

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

ISBN: (纸本)9781479907342

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.

关键词： Distributed computing

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Constrained State-Feedback control of an Externally Excited Synchronous Machine

Constrained State-Feedback Control of an Externally Excited ...

引用

Mediterranean Conference on control & Automation

作者： Sabin - Constantin Carpiuc Mircea Lazar Faculty of Automatic Control and Computer Engineering Technical University "Gheorghe Asachi" of Iasi Department of Electrical Engineering Eindhoven University of Technology

ISBN: (纸本)9781479909964

State-feedback control of externally excited synchronous machines employed in applications such as hybrid electric vehicles and full electric vehicles is a challenging problem. Indeed, these applications are characterized by fast dynamics that are subject to hard physical and control constraints. The goal of this paper is to provide a controller synthesis method that can answer these challenges effectively. To this end, firstly, a linear control law is obtained for the unconstrained dynamics via a standard control Lyapunov function (CLF), along with an admissible basin of attraction. Then, a piecewise affine control law defined on a cubic partition of the state-space is obtained for the constrained dynamics via a flexible CLF. An a posteriori test for checking stability and invariance of a set of initial conditions for the resulting closed-loop dynamics is also proposed. The effectiveness of the developed synthesis method is demonstrated in a realistic simulation scenario.

关键词： state feedback control synchronous machines feedback control region of attraction chlorofibre Hybrid electric vehicles Peptide Synthesis Technique Organic Synthesis Techniques Inorganic Synthesis Techniques control law invariance dynamics INITIAL CONDITIONS all-electric

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Selecting sensor for on load tap changer contacts degree of wear diagnostics

Selecting sensor for on load tap changer contacts degree of ...

引用

作者： Cichoń, A. Boruckia, S. Bergerb, P. Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Prószkowska 76 45-758 Opole Poland TurboCare Poland S.A. Powstańców slĄskich 85 42-701 Lubliniec Poland

Results of scientific research works considering selection of measuring transducer applied for registration of acoustic emission signals generated by on load tap changers are presented in the paper. During the coupling process acoustic emission signals are generated by: the mechanical setup of tap changer, contacts operation, and other phenomena. For most on load tap changers types, the working medium is insulation oil in which the acoustic wave being formed propagates to the steal tank. There exists a possibility to register acoustic emission signals with a piezoelectric transducer attached to the outer tank surface or with a hydrophone immersed in the oil. Acoustic emission signal obtained in such manner contains information which describes operation of the power tap changer and the selector. A comparative analysis of acoustic emission signals generated by on load tap changers working under laboratory conditions, with applied measuring transducers with different transmittances, is presented in the paper. The comparative analysis was performed in order to determine their suitability for on load tap changers technical condition diagnosis. Based on the results achieved, one transducer which allows the registration of acoustic events generated during on load tap changers operation was selected.

关键词： Tanks (containers)

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Hardware Acceleration in Ceph Distributed File System

Hardware Acceleration in Ceph Distributed File System

引用

International Symposium on Parallel and Distributed Computing

作者： Pistirica Sorin Andrei Moldoveanu Florica Moldoveanu Alin Asavei Victor Caraman Mihai Claudiu 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)9781479907342

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.

关键词： Hardware System-on-chip Engines Monitoring File systems Multicore processing

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

引用

2013 IEEE Workshop on Advanced Robotics and Its Social Impacts, ARSO 2013

作者： Salah, Omar Asker, Ahmed Fath El-Bab, Ahmed M. R. Assal, Samy M. F. Ramadan, Ahmed A. Sessa, Salvatore Abo-Ismail, Ahmed Egypt-Japan University of Science and Technology New Borg-El-Arab city Alexandria Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Alexandria Egypt Computer and Automatic Control Dept. Faculty of Engineering Tanta University Tanta Egypt Mechatronics and Robotics Dept. Egypt-Japan University of Science and Technology Egypt School of Creative Science and Engineering Waseda University Tokyo 168-8480 Japan

ISBN: (纸本)9781479923694

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of Science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. computer simulation was built to verify the performance of the proposed system with the reference trajectory. © 2013 IEEE.

关键词： Mechanisms

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Efficient fractal method for texture classification

Efficient fractal method for texture classification

引用

International Conference on Systems and computer Science (ICSCS)

作者： Andreea Lavinia Popescu Dan Popescu Radu Tudor Ionescu Nicoleta Angelescu Romeo Cojocaru Faculty of Automatic Control and Computer Science Politehnica University of Bucharest Bucharest Romania Faculty of Mathematics and Computer Science University of Bucharest Bucharest Romania Faculty of Electrical Engineering Valahia University of Targoviste Targoviste Romania

This paper presents an alternative approach to classical box counting algorithm for fractal dimension estimation. Irrelevant data are eliminated from input sequences of the algorithm and a new fractal dimension, called efficient fractal dimension (EFD), which is based on the remaining sequences is calculated. The discriminating capacity and the time efficiency of EFD are evaluated in comparison with fractal dimension (FD) computed by box counting both theoretically and empirically. The results revealed that EFD is better than FD for texture identification and classification.

关键词： Fractals Vectors Accuracy Feature extraction Estimation Correlation

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Implementation of an inexpensive EEG headset for the pattern recognition purpose

Implementation of an inexpensive EEG headset for the pattern...

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IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications

作者： Aleksandra Kawala-Janik Michal Podpora Mariusz Pelc Pawel Piatek Jerzy Baranowski University of Greenwich School of Computing and Mathematical Sciences London United Kingdom Faculty of Electrical Engineering Automatic Control and Informaics Opole Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Krakow Poland

There are many types of bio-signals with various control application prospects. In this work possible control application domain of electroencephalographic signal obtained from an easily available, inexpensive EEG headset - Emotiv EPOC was presented. This work also involved application of an embedded system platform. That solution caused limits in choosing an appropriate signal processing method, as embedded platforms characterise with a little efficiency and low computing power. Potential implementation of the embedded platform enables to extend the possible future application of the proposed BCI. It also gives more flexibility, as the platform is able to simulate various environments. In this work traditional, statistical methods were neither used nor described.

关键词： Electroencephalography Headphones Signal processing Electrodes Noise measurement Pattern recognition MATLAB

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QUESTOR -- automatic Searching for Reports

QUESTOR -- Automatic Searching for Reports

引用

International Conference on control Systems and computer Science (CSCS)

作者： Andrei Vasilateanu Nicolae Goga Tudor Sutu Marius Nastasescu Alin Moldoveanu Victor Asavei Cristian Taslitchi Faculty of Engineering in Foreign Languages University POLITEHNICA of Bucharest Romania Romania Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Romania Info World Romania Romania

ISBN: (纸本)9781467361408

Vast arrays of reporting are nowadays in use, allowing ever increasing flexibility and control over the displayed results. However, as IT developed and became available to all business domains, the number of reports used by companies started to challenge the possibility of good management. The European funded project Questor aims to create a revolutionary product that will eliminate the complexities inherent in the report management workflow. The motivation of this project is to substitute the time consuming manual search for information in reports with an automatic one. The final purpose is to make querying the report database as simple as addressing a question in natural language. This paper gives an overview over the concept of the Questor project, its software architecture and its preliminary results.

关键词： Servers Ontologies Engines Semantics Databases Natural languages Surgery

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Estimation of nonstationary harmonic signals and its application to active control of MRI noise

Estimation of nonstationary harmonic signals and its applica...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Maciej Niedźwiecki Michał Meller Yoshinobu Kajikawa Dawid Łukwiński Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Gdańsk University of Technology Gdansk Poland Department of Electrical and Electronic Engineering Faculty of Engineering Science Kansai University Suita Osaka Japan

A new adaptive comb filtering algorithm, capable of tracking the fundamental frequency and amplitudes of different frequency components of a nonstationary harmonic signal embedded in white measurement noise, is proposed. Frequency tracking characteristics of the new scheme are studied analytically, proving (under Gaussian assumptions and optimal tuning) its statistical efficiency for quasi-linear frequency changes. Laboratory tests show that the proposed algorithm can be successfully used for active control of MRI noise.

关键词： Noise Harmonic analysis Magnetic resonance imaging Adaptation models Signal processing algorithms Estimation Power harmonic filters

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