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Period distribution analysis of some linear maps

Communications in Nonlinear Science and Numerical Simulation 2012年第10期17卷 3848-3856页

作者： Fei Chen Xiaofeng Liao Kwok-wo Wong Qi Han Yang Li State Key Lab. of Power Transmission Equipment and System Security College of Computer Science Chongqing University Chongqing 400044 PR China Department of Electronic Engineering City University of Hong Kong Hong Kong PR China Department of Automatic Control and Systems Engineering The University of Sheffield UK

This paper discusses period properties of some linear maps which are employed in various applications such as image encryption, public key cryptography and watermarking. Conditions for the bijectiveness of such maps and the existence of a period are presented. Period structure is also given. Then, the recurrence equation theory is adopted to address the period distribution problem. Finally, a framework to solve the problem is proposed with a demonstration of its effectiveness and efficiency into some applications.

关键词： Linear map Period distribution Periodic orbit Dynamical system Cat map

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Reference governor design with guarantees of detection for delay variation

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IFAC Proceedings Volumes 2012年第14期45卷 67-72页

作者： Nikola Stanković Florin Stoican Sorin Olaru Silviu-Iulian Niculescu SUPELEC System Sciences (E3S - Automatic Control Department Gif-sur-Yvette France Norwegian University of Science and Technology - Department of Engineering Cybernetics Trondheim Norway SUPELEC-CNRS LSS - Laboratory of Signals and Systems Gif-sur-Yvette France

The present paper deals with fault tolerant control for linear dynamics with additive disturbances. The control action is generated based on information collected from a redundant, multi-sensors network. Delays that may appear during plant measurements transmission through real communication channels are considered as faults. Depending on presence of delay in feedback loop, different invariant sets can be computed. We show that fault tolerant control can be achieved through invariant sets separation with respect to different delay values. Sets separation is accomplished for specific values of the reference signal. Therefore, we introduce in the loop a reference governor which is designed by a receding horizon technique. Thus, we provide reference signals which practically guarantee fault detection and identification in real time.

关键词： Fault tolerance Time-Delay systems Set invariance

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Robust decentralized dynamic control for synchronization of a complex dynamical network with randomly occurring uncertainties

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Nonlinear Dynamics 2012年第1期70卷 559-570页

作者： Lee, Tae H. Park, Ju H. Wu, Zheng-Guang Lee, Sang-Choel Lee, Dong Ha Nonlinear Dynamics Group Department of Electrical Engineering Yeungnam University Kyongsan Republic of Korea National Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Yuquan Campus Hangzhou Zhejiang P.R. China Division of IT Convergence/Division of Robotics System DGIST Daegu Republic of Korea

This paper considers synchronization problem of an uncertain complex dynamical network. The norm-bounded uncertainties enter into the complex dynamical network in randomly ways, and such randomly occurring uncertainties (ROUs) obey certain mutually uncorrelated Bernoulli distributed white noise sequences. Under the circumstances, a robust $\mathcal{H}_{\infty}$ decentralized dynamic feedback controller is designed to achieve asymptotic synchronization of the network. Based on Lyapunov stability theory and linear matrix inequality (LMI) framework, the existence condition for feasible controllers is derived in terms of LMIs. Finally, the proposed method is applied to a numerical example in order to show the effectiveness of our result.

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New results on synchronization for complex dynamical networks with time-varying coupling delay and sampled-data

New results on synchronization for complex dynamical network...

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International Conference on control, Automation and systems ( ICCAS)

作者： Zheng-Guang Wu Ju H. Park Bo Song Sang-Choel Lee Dong Ha Lee Department of Electrical Engineering Yeungnam University Kyongsan South Korea National Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou Zhejiang China Division of IT Convergence/Division of Robotics System DGIST Daegu South Korea

This paper is concerned with the synchronization problem for complex dynamical networks with time-varying coupling delay and sampled-data. The sampling period considered here is assumed to be time-varying but bounded. A novel exponential synchronization condition is established based on the Gronwall's inequality, and an explicit expression for a set of sampled-data synchronization controllers is also given in terms of the solution to linear matrix inequalities. A numerical example is introduced to show the effectiveness of the given result.

关键词： Synchronization Delay Symmetric matrices Couplings Complex networks Trajectory Time varying systems

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Development of a Cloud-Computing-based Equipment Monitoring system for Machine Tool Industry

Development of a Cloud-Computing-based Equipment Monitoring ...

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IEEE International Conference on Automation Science and engineering

作者： Min-Hsiung Hung Yu-Chuan Lin Tran Quoc Huy Haw-Ching Yang Fan-Tien Cheng Department of Computer Science and Information Engineering Chinese Culture University Institute of Manufacturing Information and Systems National Cheng Kung University Institute of System Information and Control National Kaohsiung First University of Science and Technology

ISBN: (纸本)9781467304290

This paper aims to present the design of a cloud computing-based equipment monitoring system (EMS), called CCEMS, for the CNC machine tool industry to illustrate the paradigm shift of EMSs from basing on the Internet to basing on the cloud. In the CCEMS, Graphical User Interface (GUI) plays an important role that allows users to interact with the system for controlling and operating equipment, monitoring equipment performance and statuses, detecting and diagnosing equipment faults, conjecturing production quality and precision of equipment, and so on. To overcome the shortcomings of traditional Web GUIs, this paper proposes a novel Web application implementation framework, called NWAIF, for the CCEMS, by using Service-Oriented Architecture (SOA) and Rich Internet Application (RIA) technology. Finally, a paradigm CCEMS for monitoring CNC machine tools is constructed and used to validate the efficacy of the CCEMS and NWAIF. Testing results show that the paradigm CCEMS meets the desired functional requirements and the GUIs created by using the proposed NWAIF is superior to traditional Web-based GUIs in terms of shorter response times to complete the testing operations.

关键词： Machine tool industry graphical user interfaces Reaction Time Numerically controlled machines control systems CLOUDS Clouds Service-oriented architecture EQUIPMENT Internets

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Compact, lightweight adsorber and Sabatier reactor for CO2 capture and reduction for consumable and propellant production 42

Compact, lightweight adsorber and Sabatier reactor for CO2 c...

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42nd International Conference on Environmental systems 2012, ICES 2012

作者： Junaedi, Christian Hawley, Kyle Walsh, Dennis Roychoudhury, Subir Busby, Stacy A. Abney, Morgan B. Perry, Jay L. Knox, James C. Precision Combustion Inc North Haven CT 06473 United States Jacobs Engineering Group Huntsville AL 35812 United States NASA George C. Marshall Space Flight Center Huntsville AL 35812 United States Microlith Products 410 Sackett Point Rd North Haven CT 06473 United States not available 410 Sackett Point Rd North Haven CT 06473 United States Jacobs ESTS Group Huntsville AL 35812 United States Environmental Control and Life Support Systems Development Branch NASA Marshall Bldg 4755 Huntsville AL 35812 United States Space Systems Department ECLS System Development Branch/ES62 NASA Marshall Huntsville AL 35812 United States Environmental Control Systems Space Systems Department NASA Marshall Huntsville AL 35812 United States

ISBN: (数字)9781600869341

ISBN: (纸本)9781600869341

The utilization of CO2 to produce (or recycle) life support consumables, such as O2 and H2O, and to generate propellant fuels is an important aspect of NASA's concept for future, long duration planetary exploration. One potential approach is to capture and use CO2 from the Martian atmosphere to generate the consumables and propellant fuels. Precision Combustion, Inc. (PCI), with support from NASA, continues to develop its regenerable adsorber technology for capturing CO2 from gaseous atmospheres (for cabin atmosphere revitalization and in-situ resource utilization applications) and its Sabatier reactor for converting CO2 to methane and water. Both technologies are based on PCI's Microlith® substrates and have been demonstrated to reduce size, weight, and power consumption during CO2 capture and methanation process. For adsorber applications, the Microlith substrates offer a unique resistive heating capability that shows potential for short regeneration time and reduced power requirements compared to conventional systems. For the Sabatier applications, the combination of the Microlith substrates and durable catalyst coating permits efficient CO2 methanation that favors high reactant conversion, high selectivity, and durability. Results from performance testing at various operating conditions will be presented. An effort to optimize the Sabatier reactor and to develop a bench-top Sabatier Development Unit (SDU) will be discussed. © 2012 by Precision Combustion, Inc.

关键词： Carbon dioxide

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Extending CSP to detect motor imagery in a four-class BCI

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Journal of Information and Computational Science 2012年第1期9卷 143-151页

作者： Fang, Yonghui Chen, Minyou Zheng, Xufei Harrison, R.F. State Key Laboratory of Power Transmission Equipment and System Security New Technology Chongqing University Chongqing 400044 China School of Electronic and Information Engineering Southwest University Chongqing 400715 China College of Computer Science Sichuan University Chengdu 610065 China Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

Brain Computer Interface (BCI) provides a direct communication channel from brain to peripheral equipment. Common Spatial Patterns (CSP) is wildly used to extract features for electroencephalogram (EEG). However, basic CSP only suits two-class discrimination and is unable to solve multi-class discrimination problems. This paper proposes a modified CSP method termed Bisearch Common Spatial Patterns (BCSP) to solve a four-class BCI problem. In BCSP, the Fisher's Linear Discriminant Analysis (LDA) is used to discriminate among the four motor imagery tasks. The BCSP can effectively reduce the number of the basic CSP, and thus makes the overall classification procedure more efficient. The Graz BCI data set from the BCI 2008 competition be used to verify the effectiveness of the BCSP. Simulation results show that BCSP has better performance than other extension schemes. © 2012 Binary Information Press January 2012.

关键词： Brain computer interface

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Feature extraction of motor imagery in BCI with approximate entropy

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Journal of Computational Information systems 2012年第6期8卷 2485-2491页

作者： Fang, Yonghui Chen, Minyou Zheng, Xufei Harrison, Robert F State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing 400044 China School of Electronic and Information Engineering Southwest University Chongqing 400715 China College of Computer Science Sichuan University Chengdu 610065 China Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom

Approximate Entropy (ApEn) is a regularity statistic that quantifies the unpredictability of fluctuations in a time series and can classify complex systems. This study, ApEn is used to extract features from motor imagery Electroencephalogram (EEC) that containing two motor imagery tasks. This method is different from the traditional way to get the character from EEC. Appropriate parameters must been chosen for different dataset. Two datasets are used in this paper. One comes from BCI Competion2003, the other from the lab of Electromagnetic theory and artincal intelligence, Chongqing University. The results show that ApEn can extract different features in left-hand and right-hand motor imagery EEC efficiently. Comparison between ApEn and Fast Fourier Transform (FFT) shows that ApEn has good capability to the two imagery tasks Brain Computer Interface. © 2012 Binary Information Press.

关键词： Electroencephalography

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Analysis of particular iris recognition stages

Analysis of particular iris recognition stages

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4th International Conference on Multimedia Communications, Services and Security, MCSS 2011

作者： Marciniak, Tomasz DĄbrowski, Adam Chmielewska, Agata Krzykowska, Agnieszka Poznań University of Technology Department of Control and System Engineering Division of Signal Processing and Electronic Systems ul. Piotrowo 3a 60-965 Poznań Poland

ISBN: (纸本)9783642215117

In this paper particular stages are analyzed present in the iris recognition process. First, we shortly describe available acquisition systems and databases of iris images, which can be used for tests. Next, we concentrate on features extraction and coding with the time analysis. Results of average time of loading the image, segmentation, normalization, features encoding, and also recognition accuracy for CASIA and IrisBath databases are presented. © 2011 Springer-Verlag.

关键词： Biometrics

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Deviation propagation and reduction analysis for multi-operational machining processes

Deviation propagation and reduction analysis for multi-opera...

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IEEE 2011 10th International Conference on Electronic Measurement and Instruments, ICEMI 2011

作者： Liang, Ju Wang, Dongfeng Jiang, Ping Beijing Aerospace Control Center Beijing China Beijing Special Engineering Design and Research Institute Beijing China Department of System Engineering College of Information Systems and Management National University of Defense Technology Changsha Hunan China

ISBN: (纸本)9781424481590

Product dimensional quality has been one of the most important challenges for machining processes. However, current practice in multi-operational machining is a monitoring or inspection oriented measurement strategy which could not provide solutions for deviation reduction while deviation propagation and compensation are taken into account. While the deviation of some quality characteristic is not satisfactory and could not be controlled in the last operation, a partial least squares regression method is proposed to set up the relations between upstream operations and the last one. The regression result helps engineers to identify key processes with respect to their impacts on the last one, and to figure out possible solutions to reduce the deviation and thus makes the quality characteristic achieve the acceptable level. An industrial case is presented to illustrate our proposed methodology. © 2011 IEEE.

关键词： Machining

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