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A simple tuning method for a class of feedforward controllers utilizing PID

A simple tuning method for a class of feedforward controller...

引用

SICE Annual Conference

作者： Masataka Hamada Shigeru Yamamoto Division of Electrical and Computer Engineering Graduate School of Natural Science and Technology Kanazawa University Japan Faculty of Electrical and Computer Engineering Institute of Science and Engineering Kanazawa University Japan

We consider a tuning problem for a class of feedforward controllers for a given closed-loop system with an unknown plant by only using of the input and output measurements. The feedforward controllers which should be tuned are implemented as a unity feedback system of a conventional PID controller. Hence, the feedforward controller is just tuned by the PID parameters which is implemented in the controller. In this paper, we propose a direct method to obtain a suitable PID parameter to produce a desired response based on a data matching approach.

关键词： Three-term control Control systems Feedback Hydrogen Adaptive control Transfer functions Optimized production technology Electric variables measurement Nonlinear control systems Control nonlinearities

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Numerical estimation of characteristics of voltage-current sensor of resin molded type for 22kV power distribution systems

Numerical estimation of characteristics of voltage-current s...

引用

SICE Annual Conference

作者： Takuro Kubo Tatsuya Furukawa Hisao Fukumoto Masashi Ohchi Department of Electrical and Electronic Engineering Faculty of Science and Engineering Saga University Saga Japan Department of Electrical Electronics and Computer Engineering Faculty of Engineering Chiba Institute of Technology Chiba Japan

The electric power is indispensable and its stable supply is always expected. A stable supply needs the real-time observation of load conditions by measurement of power factor. In addition, the various faults have been caused from the harmonic voltage and current. In the authors' laboratory, the sensor, which simultaneously measures both the waveforms of the voltage and current without contacting the conductors in the three-phase power distribution system directly, has been designed and implemented. Using the sensor, we will observe the power factor and harmonics from the measured waveforms of voltage and current in power distribution line. However, the experimental sensor was designed to be applied to the 6.6 kV power distribution system in the dielectric strength. The authors will propose the sensor for the 22 kV power distribution system and investigate the output characteristics of this new sensor from numerical results based on the finite element method.

关键词： Voltage Sensor phenomena and characterization Sensor systems Resins Power distribution Power measurement Reactive power Current measurement Conductors Power system harmonics

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Location-release signature for vehicular communications

Location-release signature for vehicular communications

引用

2009 18th International Conference on computer Communications and Networks, ICCCN 2009

作者： Lin, Xiaodong Lu, Rongxing Shen, Xuemin Faculty of Business and Information Technology University of Ontario Institute of Technology L1H 7K4 Canada Department of Electrical and Computer Engineering University of Waterloo Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781424445813

In this paper, we propose a location-release signature scheme based on bilinear pairings for vehicular ad hoc networks (VANETs). Location-release signature is a capsule signature signed by a source location server that becomes valid after the signature arrives at a specific destination location, where a location server publishes some trapdoor information associated with such a destination location. The scheme can efficiently and effectively resolve the fairness problem in Store-Carry- Forward (S-C-F) communication, which is a very important issue in VANETs. With the provable security techniques, we also demonstrate the proposed scheme is provably secure in the random oracle model. © 2009 IEEE.

关键词： Location

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Roughness in sound and vision

Roughness in sound and vision

引用

Human Vision and Electronic Imaging XIV

作者： Van Egmond, René Lemmens, Paul Pappas, Thrasyvoulos N. De Ridder, Huib Faculty of Industrial Design Engineering Delft University of Technology Landbergstraat 15 2625 KX Delft Netherlands Radboud University Nijmegen Donders Institute for Brain Cognition and Behaviour Netherlands Electrical Engineering and Computer Science Northwestern University Evanston IL 60208 United States

In three experiments the perceived roughness of visual and of auditory materials was investigated. In Experiment 1, the roughness of frequency-modulated tones was determined using a paired-comparison paradigm. It was found that using this paradigm similar results in comparison to literature were found. In Experiment 2, the perceived visual roughness of textures drawn from the CUReT database was determined. It was found that participants could systematically judge the roughness of the textures. In Experiment 3 the perceived pleasantness for the textures used in Experiment 2 was determined. It was found that two groups of participants could be distinguished. One group found rough textures unpleasant and smooth textures pleasant. The other group found rough textures pleasant and smooth textures unpleasant. Although for the latter groups the relation between relative roughness and perceived pleasantness was less strong. © 2009 SPIE-IS&T.

关键词： Frequency modulation

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Implementation of web-based medical image retrieval system in Oracle

Implementation of web-based medical image retrieval system i...

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International Conference on Adaptive Science & technology (ICAST)

作者： Ivica Dimitrovski Pero Guguljanov Suzana Loskovska Communication Networks Institute (CNI) Faculty of Electrical Engineering and Information Technology Dortmund University Germany Faculty of Electrical Engineering and Information Technology Ss Cyril and Methodius University Macedonia Department of Computer Science and Engineering Faculty of Electrical Engineering and Information Technology Ss Cyril and Methodius University Macedonia

The requirement for systems that can stock, represent, and provide efficient retrieval of images is becoming very important in medicine. Content-based Image Retrieval (CBIR) for medical images is a promising approach to address the data management challenges posed by the rapidly increasing volume of medical image data in use. In this paper we present an implemented web-based system for medical image retrieval using the Oracle Multimedia features for image retrieval. The system integrates content-based and text-based retrieval for efficient and more reliable search.

关键词： Biomedical imaging Image retrieval Content based retrieval Image databases Information retrieval Spatial databases Visual databases Indexing Image storage Multimedia systems

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X-ray image denoising with directional support value transform

X-ray image denoising with directional support value transfo...

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MIPPR 2009 - Medical Imaging, Parallel Processing of Images, and Optimization Techniques: 6th International Symposium on Multispectral Image Processing and Pattern Recognition

作者： Zheng, Sheng Hendriks, Emile A. Lei, Bangjun Hao, Wei Institute of Intelligent Vision and Image Information China Three Gorges University Yichang 443002 China Information and Communication Theory Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology 2628CD Delft Netherlands

ISBN: (纸本)9780819478085

Under the support vector machine framework, the support value analysis-based image fusion has been studied, where the salient features of the original images are represented by their support values. The support value transform (SVT)-based image fusion approach have demonstrated some advantages over the existing methods in multisource image fusion. In this paper, the directional support value transform (DSVT) is applied to the denoising of some standard images embedded in white noise and the X-ray images. This directional transform is not norm-preserving and, therefore, the variance of the noisy support values will depend on the scales. And then we use the hard-thresholding rule for estimating the unknown support values in different scales and the thresholding is scale-dependent. The peak signal noise ratio (PSNR) is used as an "objective" measure of performance, and our own visual capabilities are used to identify artifacts whose effects may not be well-quantified by the PSNR value. The experimental results demonstrate that simple thresholding of the support values in the proposed method is very competitive with techniques based on wavelets, including thresholding of decimated or undecimated wavelet transforms. © 2009 Copyright SPIE - The International Society for Optical engineering.

关键词： Image fusion

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The Twente humanoid head

The Twente humanoid head

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： R. Reilink L. C. Visser J. Bennik R. Carloni D. M. Brouwer S. Stramigioli IMPACT Institute Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Enschede Netherlands Faculty of Engineering Technology University of Twente Enschede Netherlands

This video shows the results of the project on the mechatronic development of the Twente humanoid head. The mechanical structure consists of a neck with four degrees of freedom (DOFs) and two eyes (a stereo pair system) which tilt on a common axis and rotate sideways freely providing a three more DOFs. The motion control algorithm is designed to receive, as an input, the output of a biological-inspired vision processing algorithm and to exploit the redundancy of the joints for the realization of the movements. The expressions of the humanoid head are implemented by projecting light from the internal part of the translucent plastic cover.

关键词： Neck Humans Tracking Cameras Torque Gravity Robotics and automation Videoconference Mechatronics Eyes

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Robust washout control for supporting bicycle riding

Robust washout control for supporting bicycle riding

引用

SICE Annual Conference

作者： Kotaro Shima Shigeru Yamamoto Takashi Takimoto Division of Electrical and Computer Engineering Graduate School of Natural Science and Technology Kanazawa University Japan Faculty of Electrical and Computer Engineering Institute of Science and Engineering Kanazawa University Japan Science & Technology Foundation Fukuoka Industry Japan

In this paper, we consider a reduction problem of vibration in riding and rider's burden by stabilizing the bicycle at slow speed. In riding a bicycle, the reference input which is generally required by feedback methods is implicitly determined by a rider. Hence, the preassigned reference input may be biased against the rider's intention. To compensate the bias, we adopt robust washout control which can asymptotically reject the influence of the bias and is robust against the speed fluctuation of the bicycle. Furthermore, by introducing a scaling in designing robust washout control, we improve the resulting control performance.

关键词： Robust control Bicycles Wheels Feedback control Transportation Accidents Equations Friction computer industry Industrial control

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Fuzzy reliability of gracefully degradable computing systems

Fuzzy reliability of gracefully degradable computing systems

引用

International Conference on Methods and Models in computer Science, ICM2CS09

作者： Uprety, Indu Zaheeruddin Department of Computer Applications Galgotia's Institute of Management and Technology Greater Noida-201306 UP India Electrical Engineering Faculty of Engg. and Tech. Jamia Millia Islamia Jamia Nagar New Delhi-ll0025 India

ISBN: (纸本)9789380043579

Conventional reliability analysis rely on the probability model, which is often inappropriate for handling complex systems due to the lack of sufficient probabilistic information. For large complex systems made up of many components, the uncertainty of each individual parameter amplifies the uncertainty of the total system reliability. To overcome this problem, the concept of fuzzy approach has been used in the evaluation of the reliability of a system. In this paper, we use a gracefully degradable redundant computing system to capture the effect of coverage factor and repair on its reliability. Markov models on the other hand can handle degradation, imperfect fault coverage, complex repair policies, multi-operational-state components, dependent failures, and other sequence dependent events. In order to have the advantages of both fuzzy and Markov approaches, an attempt has been made to develop a fuzzy based Markov model.

关键词： Reliability analysis

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Adaptive distance relaying scheme in presence of UPFC using WAMS

Adaptive distance relaying scheme in presence of UPFC using ...

引用

IEEE PES Power Systems Conference and Exposition, PSCE

作者： K. Seethalekshmi S. N. Singh S. C. Srivastava Department of Electrical Engineering Indian Institute of Technology Kanpur Kanpur India Visiting Faculty in the Department of Electrical and Computer Engineering Mississippi State University MS USA Indian Institute of Technology Kanpur India

This paper analyses the impact of unified power flow controller (UPFC) on performance of distance relaying scheme and proposes a new adaptive relaying technique for mitigating the undesirable effects of overreach/underreach shown by the conventional distance relays. The proposed scheme computes on-line control parameters of the UPFC based on synchronized phasor measurements from Phasor Measurement Units (PMU) installed at line terminals. Trip boundaries are generated for the distance relay considering the effects of control parameters of UPFC, fault resistance and system loading condition. Moreover, for deciding the trip boundaries for a given Single Line to Ground (SLG) fault, the information on self protection mode of UPFC (bypass mode), has also been utilized. A generalized regression neural network has been used to identify the trip boundaries of the distance relay. The simulation results show the ability of the generalized regression neural network to identify the trip boundaries inspite of dynamic changes in the control parameters of the UPFC.

关键词： Protective relaying Relays Phasor measurement units Neural networks Performance analysis Load flow Programmable control Adaptive control electrical resistance measurement Control systems

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