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IEEE Conference on Decision and control

作者： H.-N. Nguyen S. Olaru P.-O. Gutman M. Hovd SUPELEC Systems Sciences (E3S) - Automatic Control Department Gif sur Yvette France Faculty of Civil and Environmental Engineering Technion - Israel Institute of Technology Department of Engineering Cybernetics Norwegian University of Science and Technology

ISBN: (纸本)9781612848006

In this paper, we consider the regulation problem for uncertain and time-varying linear discrete-time systems with bounded input and bounded state. By using an interpolation technique it is shown that, the convex hull of a set of invariant ellipsoids is also invariant. Feasibility and robustly and asymptotically stable closed-loop behavior are assured by minimizing an appropriate objective function. Moreover we show that the control value can be computed by solving nonlinear equations.

关键词： Ellipsoids Interpolation Optimization Lyapunov methods Trajectory Vectors Robustness

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Securing JPEG architecture based on enhanced chaotic hill cipher algorithm

Securing JPEG architecture based on enhanced chaotic hill ci...

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International Conference on computer engineering and systems

作者： Ghada Hamissa Amany Sarhan Hatem Abdelkader Mahmoud Fahmy Electrical Engineering Dept. Faculty of Engineering KFS University Kafr-Elsheikh Egypt Information System Department Faculty ofComputer & Information Menoufia University Menoufia Egypt Computer & Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt

In the last two decades, Chaos theory has received a great deal of attention from the cryptographic community. This paper presents two ideas. First idea is using chaotic functions to overcome the weaknesses of the classical Hill cipher. The second idea is proposing a new encoder-decoder architecture, called ChaoEncoDeco, for securing JPEG images. An extra stage of encryption is embedded within the traditional JPEG codec to improve security level of such system. This security stage uses one of the chaotic functions called Logistic Map. This map is used to enhance the Hill cipher and achieve more secure encryption key. The properties of both chaotic system and of the Hill cipher encryption key are all utilized to obtain ultimate secure systems. The proposed encryption algorithm is crypto-analyzed and compared to the standard Hill cipher algorithm. Complete evaluation for the proposed architecture is also performed which indicates the effectiveness of the proposed system.

关键词： Cryptography Image coding Chaos PSNR Transform coding Time measurement Size measurement

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A novel approach for protein spots quantification in two-dimensional gel images

International Journal of Signal Processing, Image Processing...

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International Journal of Signal Processing, Image Processing and Pattern Recognition 2011年第1期4卷 1-14页

作者： Rashwan, Heshmat A. Sarhan, Amany M. Faheem, Muhammed Talaat Youssef, Bayumy A. Knowledge-Based Systems Department Informatics Research Institute Mubarak City for Science and Technology Borg ElArab Alexandria Egypt Computers and Automatic Control Engineering Department Faculty of Engineering University of Tanta Tanta Egypt Computer-Based Applications Department Informatics Research Institute Mubarak City for Science and Technology Borg ElArab Alexandria Egypt

Two-dimensional polyacrylamide gel electrophoresis of proteins is a robust and reproducible technique. It is the most widely used separation tool in proteomics. Current efforts in the field are directed at development of tools for expanding the range of proteins accessible with two-dimensional gels. Proteomics was built around the two-dimensional gel. The idea that multiple proteins can be analyzed in parallel grew from two-dimensional gel maps. Proteomics researchers needed to identify interested protein spots by examining the gel. This is time consuming, labor extensive and error prone. It is desired that the computer can analyze the proteins automatically by first detecting then quantifying the protein spots in the 2-D gel images. In our previous work, we presented a new technique for segmentation of 2-D gel images using the fuzzy c-means algorithm using the notion of fuzzy relations. In this paper, we will describe the new relational fuzzy c-means algorithm (RFCM) and use it for automatic protein spots quantification. We will also use two methods to evaluate its performance: the unsupervised evaluation method and comparison with the expert spots quantification.

关键词： Proteins

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Assimilation of Wireless Sensor Networks and remote microcomputer laboratories

Assimilation of Wireless Sensor Networks and remote microcom...

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作者： Fudurić, Darko Cmuk, Drago Knežević, Petar Mrvoš, Saša Department of Control and Computer Engineering University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb Croatia Konar - Electronics and Informatics Inc. Fallerovo etalite 22 Zagreb Croatia Department of Fundamentals of Electrical Engineering and Measurements University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb Croatia Department of Electronic Systems and Information Processing University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb Croatia

ISBN: (纸本)9789532330670

Emergence of Web 2.0 technologies became a trigger for a revolution that goes far beyond the Web. For an average student Web was transformed from a steady, accessible source of information into a place of action and viable exchange of knowledge a kind of a virtual classroom. Students started to look for experience and a touch to reality online, and this is where remote laboratories come in place. Such laboratories became an inevitable need in electrical and computer engineering courses dealing with microcomputers. This paper presents an overview of available architectures of microcomputer laboratories used today and addresses their most important limitations. Moreover, an important extension of such architecture is proposed allowing support for remote Wireless Sensor Network (WSN) laboratory. Different aspects of compatibility between microcomputer laboratories and WSNs have been examined to allow creation of an general extension model. With additional effort and adaptation, WSN nodes may serve remote clients as an economic and accessible microcomputer laboratory providing invaluable hands-on experience and a motivation for a course using it. © 2011 MIPRO.

关键词： Embedded systems

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Stability of switched block upper-triangular linear systems with switching delay: Application to large distributed systems

Stability of switched block upper-triangular linear systems ...

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2011 American control Conference (ACC)

作者： Nikolai Matni Meeko Oishi Department of Control and Dynamical Systems California Institute of Technology Pasadena CA USA Department of Electrical and Computer Engineering University of British Columbia Vancouver BC Canada

Motivated by the distributed control of fleets of identical linear subsystems, we consider the stability of block upper-triangular switched linear systems with switching delay, when switching between stable modes. Proving globally uniformly asymptotic stability (GUAS) of a switched block upper-triangular linear system can be reduced to proving GUAS for each of its block diagonal subsystems. We derive a scalable LMI-based test for GUAS under arbitrary switching, with complexity linearly dependent on the number of block diagonal elements of the system. If the system is not GUAS under arbitrary switching, we partition the state-space into regions in which switching will preserve GUAS despite a delay between the state measurements and switching time. Although we tailor these results to block upper-triangular switched linear systems, they are applicable to any switched linear system with switching delay. Two examples include control of a formation of identical vehicles under supervisory discrete control, and a switched linear system under remote control.

关键词： Switches Delay Linear systems Vehicles Stability analysis Vehicle dynamics

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Fuzzy variable structure control for PWM inverters

Fuzzy variable structure control for PWM inverters

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： En-Chih Chang Josep M. Guerrero Power Electronics Laboratory Department of Electrical Engineering I-Shou University Kaohsiung Taiwan Distributed Generation and Microgrids Laboratory Department of Automatic Control Systems Universitat Poliltècnica de Catalunya Barcelona Spain

This paper proposes the practical realization of a fuzzy variable structure control applied to a PWM inverter. Variable structure control (VSC) is a robust control method for handling nonlinear systems where occur parameter variations and external disturbances. However, control input chattering round sliding surface exists, and may deteriorate the system performance. To reduce the chattering, a fuzzy logic for VSC is applied to overcome the problem. By composing the advantages of both VSC and fuzzy logic (FL), the PWM Inverter system can be designed and produces low total harmonic distortion (THD) output voltage and fast dynamic response under different types of load. Experimental results on a single-phase PWM inverter laboratory prototype controlled by a dSPACE-based DSP controller are presented to illustrate the improved performance, particularly under severe rectifier load. Moreover, for comparison purposes, a conventional variable structure controlled single-phase PWM inverter is also tested on the same experimental system.

关键词： Inverters Pulse width modulation Power conversion Voltage control Fuzzy logic Rectifiers

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Neighborhood Discriminant Nearest Feature Line Analysis for Face Recognition

Neighborhood Discriminant Nearest Feature Line Analysis for ...

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International Conference on Innovations in Bio-inspired Computing and Applications (IBICA)

作者： Lijun Yan Jeng-Shyang Pan Shu-Chuan Chu John F. Roddick Department of Automatic Test and Control Harbin Institute of Technology Harbin China Department of Computer Science Shenzhen Graduate School Harbin Institute of Technology Shenzhen China School of Computer Science Engineering and Mathematics Flinders University of South Australia Australia

A novel subspace learning algorithm named neighborhood discriminant nearest feature line analysis (NDNFLA) is proposed in this paper. NDNFLA aims to find the discriminant feature of samples by maximizing the between-class feature line (FL) distances and minimizing the within-class FL distance. At the same time, the neighborhood is preserved in the feature space. Experimental results demonstrate the efficiency of the proposed algorithm.

关键词： Algorithm design and analysis Kernel Face Training Face recognition Principal component analysis Feature extraction

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SPC and Kalman filter-based fault detection and diagnosis for an air-cooled chiller

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Frontiers of Electrical and Electronic engineering in China 2011年第3期6卷 412-423页

作者： Biao SUN Peter B.LUH Zheng O’NEILL Center for Intelligent and Networked Systems Department of AutomationTsinghua UniversityBeijing 100084China The Tsinghua-UTC Research Institute for Integrated Building Energy Safety and Control SystemTsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering University of ConnecticutStorrsCT 06269USA United Technology Research Center United Technologies CorporationHartfordCT 06108USA

Buildings worldwide account for nearly 40%of global energy *** biggest energy consumer in buildings is the heating,ventilation and air conditioning(HVAC)*** HVAC systems,chillers account for a major portion of the energy *** chillers in good conditions through early fault detection and diagnosis is thus a critical *** this paper,the fault detection and diagnosis for an air-cooled chiller with air coming from outside in variable flow rates is *** problem is difficult since the air-cooled chiller is operating under major uncertainties including the cooling load,and the air temperature and flow rate.A potential method to overcome the difficulty caused by the uncertainties is to perform fault detection and diagnosis based on a gray-box model with parameters regarded as *** method is developed and verified by us in another paper for a water-cooled chiller with the uncertainty of cooling *** verification used a Kalman filter to predict parameters of a gray-box model and statistical process control(SPC)for measuring and analyzing their variations for fault detection and *** gray-box model in the method,however,requires that the air temperature and flow rate be nearly *** introducing two new parameters and deleting data points with low air flow rate,the requirement can be satisfied and the method can then be applicable for an air-cooled *** simulation results show that the method with the revised model and some data points dropped improved the fault detection and diagnosis(FDD)performance *** can detect both sudden and gradual air-cooled chiller capacity degradation and sensor faults as well as their recoveries.

关键词： air-cooled chiller fault detection and diagnosis(FDD) statistical process control(SPC) Kalman filter

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Individualized PID control of Depth of Anesthesia Based on Patient Model Identification During the Induction Phase of Anesthesia

Individualized PID Control of Depth of Anesthesia Based on P...

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IEEE Conference on Decision and control

作者： Kristian Soltesz Jin-Oh Hahn Guy A. Dumont J. Mark Ansermino Department of Automatic Control Lund University Lund Sweden Department of Mechanical Engineering University of Alberta Edmonton Canada Department of Electrical and Computer Engineering University of British Columbia Vancouver Canada Department of Anesthesiology Pharmacology and Therapeutics University of British Columbia Vancouver Canada

ISBN: (纸本)9781612848006

This paper proposes a closed-loop propofol admission strategy for depth of hypnosis control in anesthesia. A population-based, robustly tuned controller brings the patient to a desired level of hypnosis. The novelty lies in individualizing the controller once a stable level of hypnosis is reached. This is based on the identified patient parameters and enhances suppression of output disturbances, representing surgical stimuli. The system was evaluated in simulation on models of 44 patients obtained from clinical trials. A large amount of improvement (20 - 30percent) in load suppression performance is obtained by the proposed individualized control.

关键词： Medical control systems Drug delivery control system synthesis Medical simulation

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control and Verification of the Safety-Factor Profile in Tokamaks Using Sum-of-Squares Polynomials.

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IFAC Proceedings Volumes 2011年第1期44卷 12556-12561页

作者： Aditya Gahlawat Matthew M. Peet Emmanuel Witrant Cybernetic Systems and Controls Lab.(CSCL) Department of Mechanical Materials and Aerospace Engineering Illinois Institute of Technology Chicago Il 60616 USA Department of Mechanical Materials and Aerospace Engineering Illinois Institute of Technology Chicago Il 60616 USA Automatic Control Department of GIPSA-lab University Joseph Fourier Grenoble France

Abstract In this paper, we propose a method of using the sum-of-squares methodology to synthesize controllers for plasma stabilization in Tokamak reactors. We use a partial differential model of the poloidal magnetic flux gradient and attempt to stabilize a reference safety-factor profile. Our methods utilize full-state feedback control and are based on solving a dual version of the Lyapunov operator inequality. In addition, we implement the controller in-silico using experimental conditions inferred from the Tore Supra tokamak.

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