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21st International Conference on Electronics Communications and computers, CONIELECOMP 2011

作者： Estrada, Edson Nazeran, Homer Sierra, Gustavo Ebrahimi, Farideh Setarehdan, S. Kamaledin Department of Electrical and Computer Engineering University of Texas at El Paso El Paso TX United States Instituto de Ciencias BiomédicasUniversidad Autónoma de Ciudad Juárez Cd. Juárez Chih Mexico Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424495573

In automatic sleep stage classification, as in any other signal processing task involving the easily contaminated EEG signals, denoising constitutes a crucial pre-processing step that must be addressed before carrying out further analysis on the EEG signals. Discrete wavelet transform offers an effective solution for denoising nonstationary signals such as EEG due to its shrinkage property. In this paper, we explored the application of wavelet denoising method to EEG signals acquired during different sleep stages classified according to the RK rules, with the objective to identify suitable thresholding rules and threshold values. Preliminary results showed that the combination of soft thresholding rule applied to the Detailed wavelet coefficients with the Universal threshold value produced better performance measures such as a smaller Minimum Squared Error (MSE) and a larger signal-to-Noise Ratio (SNR). Similarly improved results were obtained for Stage 1, Stage 2, Stage 3, Stage 4 and REM stage EEG signals using this combination. Such thresholding rule and values are equally well applicable to denoising EEG epochs acquired from deep sleep stages. © 2011 IEEE.

关键词： Signal to noise ratio

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Fast Outcome Prediction based on Slow Cause Estimation: A human Inspired Approach in Air hockey game

Fast Outcome Prediction based on Slow Cause Estimation: A hu...

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IEEE International Conference on Robotics and Biomimetics

作者： S. A. Ghazvini H. Moradi M. Nili Ahmadabadi B. Araabi School of Electrical and Computer Engineering the University of Tehran Control and Intelligent Processing Center of Excellence at the Electrical and Computer Engineering Department at the University of Tehran

ISBN: (纸本)9781457721366

In this paper, we present an approach, inspired by human behavior, in predicting the state of a high speed object based on the state of another object that causes such a high speed, e.g. predicting the state of a high speed puck which is hit by a lower speed paddle in the air hockey game. The proposed approach eliminates the need for high speed sensors, such as high speed cameras and grabbers, for capturing and processing high speed motions. This approach has been implemented and tested on an air hockey simulator and in real images taken by an off-the-shelf camera. The results show that the low speed of a paddle in the air hockey can be easily captured by an off-the-shelf camera and then the state of the puck, which is the speed and its pose, after being hit by the paddle can be calculated.

关键词： Blades Prognosis Hockey Puck High speed speed sensor Cameras-High speed low speed Human behavior air Respiratory Inspiration Hunting Game theory Game animals

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On quaternion-based attitude control and the unwinding phenomenon

On quaternion-based attitude control and the unwinding pheno...

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作者： Mayhew, Christopher G. Sanfelice, Ricardo G. Teel, Andrew R. Robert Bosch Research and Technology Center 4005 Miranda Ave. Palo Alto CA 94304 United States Department of Aerospace and Mechanical Engineering University of Arizona Tucson AZ 85721 United States Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA 93106-9560 United States

ISBN: (纸本)9781457700804

The unit quaternion is a pervasive representation of rigid-body attitude used for the design and analysis of feedback control laws. Often, quaternion-based feedbacks require an additional mechanism that lifts a continuous attitude path to the unit quaternion space. When this mechanism is memoryless, it has a limited domain where it remains injective and leads to discontinuities when used globally. To remedy this limitation, we propose a hybrid-dynamic algorithm for lifting a continuous attitude path to the unit quaternion space. We show that this hybrid-dynamic mechanism allows us to directly translate quaternion-based controllers and their asymptotic stability properties (obtained in the unit-quaternion space) to the actual rigid-body-attitude space. We also show that when quaternion-based controllers are not designed to account for the double covering of the rigid-body-attitude space by a unit-quaternion parameterization, they can give rise to the unwinding phenomenon, which we characterize in terms of the projection of asymptotically stable sets. © 2011 AACC American Automatic control Council.

关键词： controllers

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Synergistic Lyapunov functions and backstepping hybrid feedbacks

Synergistic Lyapunov functions and backstepping hybrid feedb...

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ISBN: (纸本)9781457700804

The notion of synergistic potential functions has been introduced recently in the literature and has been used as the basis for the design of hybrid feedback laws that achieve global asymptotic stabilization of a point on a compact manifold (without boundary) such as S1, S2, and SO(3). Here, synergistic potential functions are generalized - to synergistic Lyapunov functions - and are shown to be amenable to backstepping. In particular, if an affine control system admits a (weak) synergistic Lyapunov function and feedback pair then the system with an integrator added at the input also admits a synergistic Lyapunov and feedback pair. This fact enables "smoothing" hybrid feedbacks, or implementing them through a chain of integrators. In this way, hybrid control designed at a kinematic level can be redesigned for control through forces, torques, or even the derivative of these quantities. We demonstrate the backstepping procedure for attitude stabilization of a rigid body using a quaternion parametrization. © 2011 AACC American Automatic control Council.

关键词： Lyapunov functions

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On the non-robustness of inconsistent quaternion-based attitude control systems using memoryless path-lifting schemes

On the non-robustness of inconsistent quaternion-based attit...

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ISBN: (纸本)9781457700804

The unit quaternion is a pervasive representation of rigid-body attitude used for the design and analysis of feedback control laws. Quaternion-based feedback control laws that are inconsistent (i.e. do not have a unique value for a given attitude) require an additional mechanism that lifts a continuous attitude trajectory to the unit quaternion space. Lifting mechanisms that are memoryless, for example, selecting the quaternion having positive scalar component, have a limited domain where they remain injective and, when used globally, introduce discontinuities into the closed-loop system. We show that such discontinuities can be exploited by an arbitrarily small measurement disturbance to stabilize attitudes far from the desired attitude and destroy "global" attractivity properties. © 2011 AACC American Automatic control Council.

关键词： Closed loop systems

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Detecting environmental change using Self-Organizing Map techniques applied to the ERA-40 database

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Data Science Journal 2011年 10卷 1-12页

作者： Gebril, Mohamed Kihn, Eric Said, Eyad Haj Homaifar, Abdollah Autonomous Control and Information Technology Center Department of Electrical and Computer Engineering North Carolina A and T State University Greensboro NC 27411 United States University of Kalamoom Deratiah Syria

Data mining is a valuable tool in meteorological applications. Properly selected data mining techniques enable researchers to process and analyze massive amounts of data collected by satellites and other instruments. Large spatial-temporal datasets can be analyzed using different linear and nonlinear methods. The Self-Organizing Map (SOM) is a promising tool for clustering and visualizing high dimensional data and mapping spatial-temporal datasets describing nonlinear phenomena. We present results of the application of the SOM technique in regions of interest within the European re-analysis data set. The possibility of detecting climate change signals through the visualization capability of SOM tools is examined.

关键词： Self organizing maps

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Tuning method for second-order active disturbance rejection control

Tuning method for second-order active disturbance rejection ...

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作者： Chen, Xing Li, Donghai Gao, Zhiqiang Wang, Chuanfeng State Key Lab of Power Systems Dept of Thermal Engineering Tsinghua University Beijing 100084 China Center for Advanced Control Technologies Department of Electrical and Computer Engineering Cleveland State University Cleveland OH 44115 United States

ISBN: (纸本)9789881725592

A simple tuning method for second-order active disturbance rejection control (ADRC) that achieves high performance and good robustness for a wide range of processes is presented. ADRC is a novel control strategy whose exciting performance has been shown by literatures. The proposed method makes ADRC become easy to tune and more practical. Once the desired settling time is given, only one parameter need to be tuned during the design procedure, which can be found by monotonously increasing. Examples are given to show the effectiveness and flexibility of the method. Simulations demonstrate that second-order ADRC can handles processes with various characteristics, including low- and high-order, large dead time, non-minimum phase, unstable and distributed parameter systems. © 2011 Chinese Assoc of Automati.

关键词： Monte Carlo methods

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A new method for hybrid-fuzzy identification *

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IFAC Proceedings Volumes 2011年第1期44卷 15013-15018页

作者： Alfredo Núñez Doris Sáez Igor Škrjanc Bart De Schutter Delft Center for Systems and Control Delft University of Technology Delft The Netherlands Electrical Engineering Department Universidad de Chile Santiago Chile Faculty of Electrical and Computer Engineering University of Ljubljana Slovenia

Abstract In this paper a new identification method for non-linear hybrid systems that have mixed continuous and discrete states by using fuzzy clustering and principal component analysis is described. The method first determines the hybrid characteristic of the system inspired by an inverse form of the merge method for clusters, which makes it possible to identify the unknown switching points of a process based on just input-output data. Using the switching points, a hard partition of the input-output space is obtained. Then, we propose to use Takagi-Sugeno (TS) fuzzy models with Gaussian MFs as sub-models for each partition. Thus, the overall model is hybrid-fuzzy and will include explicitly the hybrid behavior of the system (the detected switching points) by means of binary MFs, and in each partition all the other non-linearities by means of TS sub-models. An illustrative experiment on a hybrid-tank system is conducted to present the benefits of the proposed approach.

关键词： Nonlinear system identification hybrid and distributed system identification fuzzy identification fuzzy clustering principal component analysis

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Stabilization of linear systems with distributed delay and saturation nonlinearity

Stabilization of linear systems with distributed delay and s...

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作者： Zhou, Bin Gao, Huijun Lin, Zongli Duan, Guang-Ren Center for Control Theory and Guidance Technology Harbin Institute of Technology China Space Control and Inertial Technology Research Center Harbin Institute of Technology China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia United States

ISBN: (纸本)9789881725592

This paper is concerned with stabilization of a linear system with distributed input delay and input saturation. Both constant and time-varying delays are considered. In the case that the input delay is constant, under the stabilizability assumption on an auxiliary system, it is shown that the system can be stabilized by state feedback for an arbitrarily large delay as long as the open-loop system is not exponentially unstable. In the case that the input delay is time-varying, but bounded, it is shown that the system can be stabilized by state feedback if the non-asymptotically stable poles of the open-loop system are all located at the origin. In both cases, stabilizing controllers are explicitly constructed by utilizing the parametric Lyapunov equation based low gain design approach we recently developed. It is also shown that in the presence of actuator saturation and under the same assumptions on the system, these controllers achieve semi-global stabilization. Some discussions on the assumptions we impose on the system are given. A numerical example illustrate the effectiveness of the proposed stabilization approach. © 2011 Chinese Assoc of Automati.

关键词： Stabilization

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Functional requirement and realization of regional smart grid energy management system

Functional requirement and realization of regional smart gri...

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2011 International Conference on Information and Automation, ICIA 2011

作者： Zhang, Xilin Han, Xiaojuan Wan, Xiaohua Wang, Shuo Dispatching Center Changchun Power Supply Company Changchun 130012 China Department of Control and Computer Engineering North China Electrical Power University Beijing 102206 China Department of Engineering Changchun Huaxin Automation Engineering Co. Ltd. Changchun 130012 China Transformation Controlled Company Jilin Electric Power Transmission Engineering Corporation Changchun 130012 China

ISBN: (纸本)9781457702686

From the requirement of satisfying regional monitoring and scheduling management under the characteristics of the regional grid and the connotation of intelligent grid as well as regulation and control integration management, power quality on-line monitoring of EMS in regional intelligent grid and optimized operation setting checking conditions of arc-suppression coil are discussed in this paper. Load forecast data sources and functional requirements of SCADA picture for engineering design and realization method are provided in this paper. © 2011 IEEE.

关键词： Smart power grids

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