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Asian control Conference

作者： Lifeng Ma Zidong Wang Zhi Guo Hongli Dong Bo Shen School of Automation Nanjing University of Science and Technology of PLA Nanjing China Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK College of Electrical and Information Engineering Daqing Petroleum Institute Daqing China Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin China School of Information Science and Technology Donghua Uinversity Shanghai China

ISBN: (纸本)9781424454402

This paper is concerned with the variance-constrained controller design problem for a class of uncertain nonlinear stochastic systems with possible actuator faults. The stochastic nonlinearities described by statistical means are quite general that include several well-studied classes of nonlinearities as special cases. A model of actuator failures is adopted which is more practical than the traditional outage one. A linear matrix inequality (LMI) approach is proposed to solve the multiobjective fault-tolerant controller design problem, where both the exponential stability and the steady-state state variance indices are simultaneously guaranteed. Within the developed LMI framework, a sufficient condition for the solvability of the robust control problem is obtained. The explicit expression of the desired controllers is also parameterized and a single degree-of-freedom (SDOF) model is used to demonstrate the effectiveness and applicability of the proposed design approach.

关键词： Robust control Fault tolerant systems Nonlinear control systems control systems Stochastic systems Actuators Stochastic processes Linear matrix inequalities Fault tolerance Stability

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Upper bounds for the secure key rate of the decoy-state quantum key distribution

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Physical Review A 2009年第3期79卷 032335-032335页

作者： Marcos Curty Tobias Moroder Xiongfeng Ma Hoi-Kwong Lo Norbert Lütkenhaus Department of Signal Theory and Communications ETSI Telecomunicación University of Vigo Campus Universitario E-36310 Vigo (Pontevedra) Spain Institute for Quantum Computing University of Waterloo Waterloo Ontario Canada N2L 3G1 Quantum Information Theory Group Institut für Theoretische Physik I and Max-Planck Research Group Institute of Optics Information and Photonics University of Erlangen–Nürnberg 91058 Erlangen Germany Department of Electrical and Computer Engineering and Department of Physics Center for Quantum Information and Quantum Control (CQIQC) University of Toronto Toronto Ontario Canada M5S 3G4

The use of decoy states in quantum key distribution (QKD) has provided a method for substantially increasing the secret key rate and distance that can be covered by QKD protocols with practical signals. The security analysis of these schemes, however, leaves open the possibility that the development of better proof techniques or better classical postprocessing methods might further improve their performance in realistic scenarios. In this paper, we derive upper bounds on the secure key rate for decoy-state QKD. These bounds are based basically only on the classical correlations established by the legitimate users during the quantum communication phase of the protocol. The only assumption about the possible postprocessing methods is that double click events are randomly assigned to single click events. Further, we consider only secure key rates based on the uncalibrated device scenario which assigns imperfections such as detection inefficiency to the eavesdropper. Our analysis relies on two preconditions for secure two-way and one-way QKD. The legitimate users need to prove that there exists no separable state (in the case of two-way QKD) or that there exists no quantum state having a symmetric extension (one-way QKD) that is compatible with the available measurements results. Both criteria have been previously applied to evaluate single-photon implementations of QKD. Here we use them to investigate a realistic source of weak coherent pulses. The resulting upper bounds can be formulated as a convex optimization problem known as a semidefinite program which can be efficiently solved. For the standard four-state QKD protocol, they are quite close to known lower bounds, thus showing that there are clear limits to the further improvement of classical postprocessing techniques in decoy-state QKD.

关键词： Quantum cryptography

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Thin Film Photovoltaic/Thermal Solar Panels

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电工电能新技术 2008年第3期27卷 1-8页

作者： David JOHNSTON Power and Control Research Group School of Computing Engineering and Ihformation Sciences University of Northumbria at Newcastle NE1 8ST UK

A solar panel is described,in which thin films of semiconductor are deposited onto a metal *** semiconductor-metal combination forms a thin film photovoltaic cell,and also acts as a reflector-absorber tandem,which acts as a solar selective surface,thus enhancing the solar thermal performance of the collector *** use of thin films reduces the distance heat is required to flow from the absorbing surface to the metal plate and heat exchange *** modelling demonstrated that,by suitable choice of materials,photovoltaic efficiency can be maintained,with thermal performance slightly reduced,compared to that for thermal-only *** grading the absorber layer-to reduce the band gap in the lower region-the thermal performance can be improved,approaching that for a thermal-only solar panel.

关键词：太阳能技术光电性能收集板半导体

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Contourlet Based Interest Points Detector

Contourlet Based Interest Points Detector

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20th IEEE International Conference on Tools with Artificial Intelligence

作者： Saydam, Samer R. El rube', Ibrahim A. Shoukry, Amin A. CS Department Computing and Information Technology College AASTMT Egypt EC Eng. Dept. College of Engineering and Technology AASTMT Egypt Computer Science and Automatic Control Department Faculty of Engineering Alexandria University Egypt

ISBN: (纸本)9780769534404

This paper proposes a robust algorithm for detecting interest points based on the NonsubSampled Contourlet Transform (NSCT). The NSCT provides multiscale decomposition with directional filters at each scale. Furthermore, NSCT is very efficient in extracting the geometric information of images and therefore it has very good feature localization. The NSCT-based point detector is compared to the widely used Harris and Difference of Gaussian (DoG) interest point detectors. The experimental results reveal the robustness of the proposed algorithm to rotation, scale and viewpoint changes.

关键词： Interest point detection corner detector local features nonsubsampled contourlet transform (NSCT)

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Routing and scheduling in Multi-AGV systems based on dynamic banker algorithm

Routing and scheduling in Multi-AGV systems based on dynamic...

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Mediterranean Conference on control and Automation (MED)

作者： Vedran Bobanac Stjepan Bogdan Department of Control and Computer Engineering Faculty of Electrical Engineering and Computing University of Zagreb Croatia

In this paper we propose modified Banker's algorithm for routing and scheduling in multi-AGV systems. A mission path, determined by string algebra is executed in a way that some unsafe states are allowed in order to achieve better utilization of vehicles. Moreover, a method for splitting a mission path is proposed so that number of resources (arcs) needed for mission execution is gradually reduced which provides less restrictions on availability vector, thus allowing more traveling space for other vehicles. Results shown at the end of the paper demonstrate strength of the proposed method compared with standard Banker's algorithm.

关键词： Automation Conferences

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Gypsum waste reduction through stabilization for trench backfill

Gypsum waste reduction through stabilization for trench back...

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GeoCongress 2008: Geotechnics of Waste Management and Remediation

作者： Rahman, Md. Waliur Ghataora, Gurmel S. Chapman, D.N. Tyrer, Mark Claisse, Peter Ganjian, Essie Department of Civil Engineering School of Engineering University of Birmingham B15 2TT United Kingdom Centre for Environmental Control and Waste Management Imperial College London United Kingdom Department of Civil Engineering Faculty of Engineering and computing Coventry University United Kingdom

ISBN: (纸本)9780784409701

Conventional backfill for utility trenches often comprises of granular crashed rock, which is Type I subbase material as used in road pavement construction. However, the increasing need to preserve resources and to use recovered and recycled materials led to the consideration of using gypsum as a utility trench backfill material. Thus a range of mixtures containing waste gypsum were investigated. During this study it was found that mixes containing waste gypsum, limestone quarry dust and ordinary Portland cement complied with the existing Specifications for trench backfill in terms of unconfined compressive strength as well as durability in respect of loss of strength on soaking and freeze thaw. Leachate tests showed that sulphate levels were also within acceptable limits. Copyright ASCE 2008.

关键词： Gypsum

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An efficient and secure biometric remote user authentication scheme using smart cards

An efficient and secure biometric remote user authentication...

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2008 Pacific-Asia Workshop on Computational Intelligence and Industrial Application, PACIIA 2008

作者： Xiaomin, Wang Wenfang, Zhang Key Laboratory of Traffic Information Engineering and Control Southwest Jiaotong University Chengdu Sichuan 610031 China Key Laboratory of Information Security and National Computing Grid Southwest Jiaotong University Chengdu Sichuan 610031 China

ISBN: (纸本)9780769534909

Remote user authentication schemes are widely investigated recently. This paper points out some existent problems in smartcard based schemes. As a comprehensive solution, a novel authentication scheme using two-variant hashing technique and fingerprintbiometric is presented. Security analysis shows that the proposed scheme provides secure, robust, and trustworthy remote authentication over insecure network. Moreover, computational costs and efficiency of this scheme are encouraging for practical implementation in the resourceconstraint environment. © 2008 IEEE.

关键词： Smart cards

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Wavelet de-noising and gradient enhancement in biomedical image processing

Wavelet de-noising and gradient enhancement in biomedical im...

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8th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2008

作者： Procházka, Aleš Hošťálková, Eva Vyšata, Oldřich Department of Computing and Control Engineering Institute of Chemical Technology in Prague Technická 6 166 28 Prague 6 Czech Republic Neurocenter Caregroup Jiráskova 1389 516 01 Rychnov nad Kněžnou Czech Republic

ISBN: (纸本)9780889867598

Detection of specific image components, their visualization and classification belong to main topics of biomedical image processing. The paper is devoted to problems related to the use of discrete wavelet transform (DWT) and the dual-tree complex wavelet transform (DTCWT) for image denoising and to selected methods of its enhancement. The study presents the analysis of results achieved for different wavelet functions and the following application of gradient methods for specific image components detection. The information content of final images is followed both from the medical point of view using the previous experience and numerically through the analysis of image spectral components. The proposed methods indicate the efficiency of the dual-tree complex wavelet transform use in this area.

关键词： Image denoising

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Multi-channel signal segmentation and classification

Multi-channel signal segmentation and classification

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8th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2008

作者： Procházka, Aleš Bartošová, Veronika Vyšata, Oldřich Department of Computing and Control Engineering Institute of Chemical Technology in Prague Technická 6 166 28 Prague 6 Czech Republic Neurocenter Caregroup Jiráskova 1389 516 01 Rychnov nad Kněžnou Czech Republic

ISBN: (纸本)9780889867598

Multi-channel sensors and multi-channel signal analysis form a specific area of general digital signal processing methods with applications in medicine, environmental signal analysis or technology. The paper is devoted to general mathematical methods related to initial signal de-noising, detection of its principal components and segmentation to find its specific parts. Feature detection includes the use of discrete wavelet transform (DWT) and discrete Fourier transform (DFT) for estimation of features invariant to signal shift to form clusters of close data segments. The selforganizing neural networks are then used for signal segments classification. Results are numerically evaluated by statistical analysis of distances of individual feature vector values from the corresponding cluster centers. Proposed methods are used for electroencephalogram (EEG) signal segmentation based upon detection of changes of signal spectral components applied to its first principal component, signal segments feature extraction and their classification. Results achieved are compared for different data sets and different mathematical methods used to detect signal segments features. Numerical results are compared with experience of experts specialized to EEG data analysis to allow further correlation with MR images. Proposed methods are accompanied by the appropriate graphical user interface (GUI) designed in the MATLAB environment.

关键词： Principal component analysis

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An Illumination Compensation Method for Images under Variable Lighting Condition

An Illumination Compensation Method for Images under Variabl...

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IEEE Conference on Robotics, Automation and Mechatronics

作者： Haibo Wu Ping Jiang Jin Zhu Department of Information and Control Engineering University of Tongji Shanghai China Department of Computing University of Bradford Bradford UK

This paper presents an illumination compensation method for images under variable lighting condition. The algorithm consists of two processes. First, the camera response function is identified as a nonlinear model of the camera under dynamic illumination. Then an image with a wider dynamic range is obtained online by fusing several images taken under different exposures of the same scene. The algorithm is applied to the four-legged robot soccer competition and is verified to be superior to some traditional schemes.

关键词： Lighting Cameras Layout Robot vision systems Brightness Optical imaging Dynamic range control engineering Image enhancement Face detection

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