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IEEE General Meeting Power& Energy Society

作者： James A. Momoh Yan Xia Keisha C. Alfred Center for Energy System and Control CESaC Department of Electrical and Computer Engineering Howard University College of Medicine WA USA Center for Energy System and Control CESaC Department of Electrical Engineering Howard University College of Medicine WA USA

Survivability and reliability are critical for the operation of shipboard power system both in normal and damage conditions. This paper presents a novel dynamic reconfiguration approach for shipboard power system by using multi-agent system. With the similar topology of the shipboard power system, the multi-agent system is generalized to constraint satisfaction problem (CSP). The environment- reactive rules-agents (ERA) approach, which is multi-agent oriented, is used to support the organization formation behavior in dynamic reconfiguration. The effectiveness of the proposed approach is illustrated by test results in a reduced shipboard power system.

关键词： Power system dynamics Power systems Multiagent systems Barium control systems Marine vehicles electrical engineering

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Excess Noise control in Gaussian-modulated Coherent State Quantum Key Distribution System

Excess Noise Control in Gaussian-modulated Coherent State Qu...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Bing Qi Lei-Lei Huang Yue-Meng Chi Li Qian Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering and Department of Physics University of Toronto Toronto ONT Canada

A novel polarization-frequency-multiplexing scheme is implemented to suppress noise in a fiber-based Gaussian-modulated coherent-state quantum key distribution system. The achievable secrete key rate is 0.30 bit/pulse... 详细信息

ISBN: (纸本)9781557528599

关键词： control systems Gaussian noise Gaussian distribution Quantum computing Optical fiber polarization Optical noise Fiber lasers Laser theory Phase modulation Optical pulses

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Quantum hacking: Experimental demonstration of time-shift attack against practical quantum-key-distribution systems

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Physical Review A 2008年第4期78卷 042333-042333页

作者： Yi Zhao Chi-Hang Fred Fung Bing Qi Christine Chen Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario M5S 3G4 Canada

Quantum-key-distribution (QKD) systems can send quantum signals over more than 100km standard optical fiber and are widely believed to be secure. Here, we show experimentally a technologically feasible attack—namely, the time-shift attack—against a commercial QKD system. Our result shows that, contrary to popular belief, an eavesdropper, Eve, has a non-negligible probability (∼4%) to break the security of the system. Eve’s success is due to the well-known detection efficiency loophole in the experimental testing of Bell’s inequalities. Therefore, the detection efficiency loophole plays a key role not only in fundamental physics, but also in technological applications such as QKD systems.

关键词： Optical fibers

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Quantum key distribution with an unknown and untrusted source

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Physical Review A 2008年第5期77卷 052327-052327页

作者： Yi Zhao Bing Qi Hoi-Kwong Lo Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario Canada M5S 3G4

The security of a standard bidirectional “plug-and-play” quantum key distribution (QKD) system has been an open question for a long time. This is mainly because its source is equivalently controlled by an eavesdropper, which means the source is unknown and untrusted. Qualitative discussion on this subject has been made previously. In this paper, we solve this question directly by presenting the quantitative security analysis on a general class of QKD protocols whose sources are unknown and untrusted. The securities of standard Bennett-Brassard 1984 protocol, weak+vacuum decoy state protocol, and one-decoy state protocol, with unknown and untrusted sources are rigorously proved. We derive rigorous lower bounds to the secure key generation rates of the above three protocols. Our numerical simulation results show that QKD with an untrusted source gives a key generation rate that is close to that with a trusted source.

关键词： Quantum cryptography

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Real-Time Level Plant control Using Improved BELBIC

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IFAC Proceedings Volumes 2008年第2期41卷 4631-4635页

作者： M. Masoudinejad R. Khorsandi A. Fatehi C. Lucas S. Fakhimi Derakhshan M.R. Jamali Advanced Process Automation & Control (APAC) Research Group Faculty of Electrical Engineering K. N. Toosi University of Technology Tehran Iran Center of Excellence for Control and Intelligent Processing Electrical and Computer engineering Department University of Tehran Iran

Brain emotional learning based intelligent controller (BELBIC) is based on computational model of limbic system in the mammalian brain. In recent years, this model was applied in many linear and nonlinear control applications. Previous studies show that this controller has fast response, simple implementation and robustness with respect to disturbances. It is also possible to define emotional signal based on control application objectives. But in the previous studies, internal instability of this controller was not considered and control task were done in limited time period. In this article mathematical description of BELBIC is investigated and improved to avoid internal instability. Simulation and implementation of improved model was done on level plant. The obtained results showed that instability of model has been solved in the new model without loss of performance by using Integral Anti Windup (IAW).

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A solution to unit commitment problem using hybrid ant system/priority list method

A solution to unit commitment problem using hybrid ant syste...

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National Proceedings Power and Energy Conference (PECon)

作者： Songsak Chusanapiputt Dulyatat Nualhong Sujate Jantarang Sukumvit Phoomvuthisarn Department of Electrical Power Engineering Faculty of Engineering Mahanakom University of Technology Bangkok Thailand Electrical Engineering Department Electrical and Control System Engineering Division Electricity Generating Authority of Thailand Bangkok Thailand Department of Computer Engineering and Satellite Research Center Faculty of Engineering Mahanakom University of Technology Bangkok Thailand Center of Excellence in Electrical Power Technology Chulalongkom University Bangkok Thailand

This paper presents a new method to solve unit commitment problem with operating constraints using a hybrid ant system/priority list method (HASP). The proposed methodology employs ant system in cooperating with the priority list method to find unit commitment solution as means of mutually combining the advantages of them in that a flexibility of the priority list method is reinforced, while AS algorithm can gain the benefit of using bias information for improving its performance during search process. The simulation results show that the proposed HASP is capable of obtaining satisfactory solution within reasonable computational time.

关键词： Power engineering and energy Power generation Evolutionary computation Power system simulation Fuels Costs Power engineering control systems Systems engineering and theory Hybrid power systems

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Mean square stability analysis of sampled-data supervisory control systems

Mean square stability analysis of sampled-data supervisory c...

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IEEE Conference on control Technology and Applications (CCTA)

作者： Arturo Tejada Heber Herencia-Zapana Oscar R. Gonzalez W. Steven Gray Department of Electrical and Computer Engineering Old Dominion University Norfolk VA USA Delft Center for Systems and Control Delft Netherlands

Testable second moment stability conditions for discrete-time supervisory control systems were recently developed using the Hybrid Jump Linear Systems (HJLSpsilas) framework. These tests are extended here to sampled-data supervisory control systems using the new sampled-data HJLS (SD-HJLS) framework. It is shown first that the p-moment stability of SD-HJLSpsilas equipped with ideal sample and hold operators is equivalent to that of their associated HJLSpsilas. Then, the second moment stability analysis tools developed for HJLSpsilas are extended to SD-HJLSpsilas. Finally, the results are illustrated through a Monte Carlo simulation of a simple example.

关键词： control systems USA Councils Conferences

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Suboptimal control of hybrid systems using approximate multi-parametric MILP

Suboptimal control of hybrid systems using approximate multi...

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IEEE Conference on Decision and control

作者： Jalal Habibi Ali Khaki Sedigh Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Electrical Engineering K.N. Toosi University of Technology Tehran Iran

As a way to reduce the on-line computational burden, explicit solution to the problem of optimal control for some classes of hybrid systems can be found by reformulating the problem as multi-parametric MILP problems. The main contribution of this paper is the introduction of an approximation algorithm for solving a general class of mp-MILP problems. The algorithm wisely selects those binary sequences which make important improvement in the objective function if considered. It is shown that considerable reduction in computational complexity could be achieved by introduction of adjustable level of suboptimality. So a family of suboptimal controllers would be obtained for which the level of error and complexity can be adjusted by a tuning parameter. Several important theoretical results about approximate solutions to the mp-MILP problem are presented. It is shown that no part of the parameter space is lost during the approximation. Also it is proved that the error in the achieved approximate solutions is monotonically increasing function of the tuning parameter. The reduced complexity achieved by the proposed approach is clarified through an illustrative example.

关键词： control systems Approximation algorithms Optimal control computational complexity Chromium Table lookup Binary sequences Error correction Predictive control Feedback

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Combining PMD and Stereo camera for Motion Estimation of a Mobile Robot

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IFAC Proceedings Volumes 2008年第2期41卷 5417-5422页

作者： C. Netramai O. Melnychuk C. Joochim H. Roth Center for Sensor Systems (ZESS). Paul-Bonatz-Strasse 9-11 57076 Institute of Automatic Control Engineering Department of Electrical Engineering and Computer Science. Hoelderlinstr. 3 57068. University of Siegen Germany

This paper introduces an improvement to the 6D motion estimation solution by combining the Photonic Mixer Device (PMD) and Stereo Camera. The main feature of the stereo camera is the higher resolution of the 2D image compared to the one from the PMD camera. Whereas the depth information derived from a PMD is usually far superior to the result from a stereo camera. This work hence proposes a combination scheme for the PMD and stereo camera in order to improve the results of the motion estimation. The combined setup was placed on a mobile robot and carried on the 6D motion estimation task using a provided artificial landmark. The robot was moved around while the combined setup simultaneously captures 3D images of the landmark from each new position. The motion was estimated based on the matching of the captured 3D images between two successive positions. The classical singular value decomposition (SVD) algorithm was used to solve the matching problem. The referent points for the SVD algorithm were extracted from the landmark using a robust corner detection algorithm. The experiments were fulfilled using 1) stereo 2) PMD and 3) combination of stereo and PMD camera. The results of these three arrangements are compared and the outcome of the comparing are presented.

关键词： Stereo vision Motion estimation Mobile robots Singular value decomposition Range images PMD camera

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An EEG-based subject- and session-independent drowsiness detection

An EEG-based subject- and session-independent drowsiness det...

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International Joint Conference on Neural Networks (IJCNN)

作者： Chin-Teng Lin Nikhil R. Pal Chien-Yao Chuang Tzyy-Ping Jung Li-Wei Ko Sheng-Fu Liang Department of Electrical & Control Engineering and Brain Research Center National Chiao Tung University Hsinchu Taiwan Department of Brain Research Center National Chiao Tung University Calcutta India Department of Brain Research Center National Chiao Tung University Taiwan Department of Electrical & Control Engineering and Brain Research Center National Chiao-Tung University and Institute for Neural Computation University of California San Diego La Jolla CA USA Department of Electrical & Control Engineering and Brain Research Center National Chiao Tung University Taiwan Department of Brain Research Center National Chiao-Tung University and the Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan

Monitoring and predicting human cognitive state and performance using physiological signals such as Electroencephalogram (EEG) have recently gained increasing attention in the fields of brain-computer interface and cognitive neuroscience. Most previous psychophysiological studies of cognitive changes have attempted to use the same model for all subjects. However, the relatively large individual variability in EEG dynamics relating to loss of alertness suggests that for many operators, group statistics cannot be used to accurately predict changes in cognitive states. Attempts have also been made to build a subject-dependent model for each individual based on his/her pilot data to account for individual variability. However, such methods assume the cross-session variability in EEG dynamics to be negligible, which could be problematic due to electrode displacements, environmental noises, and skin-electrode impedance. Here first we show that the EEG power in the alpha and theta bands are strongly correlated with changes in the subjectpsilas cognitive state reflected through his driving performance and hence his departure from alertness. Then under very mild and realistic assumptions we derive a model for the alert state of the person using EEG power in the alpha and theta bands. We demonstrate that deviations (computed by Mahalanobis distance) of the EEG power in the alpha and theta bands from the corresponding alert models are correlated to the changes in the driving performance. Finally, for detection of drowsiness we use a linear combination of deviations of the EEG power in the alpha band and theta band from the respective alert models that best correlates with subjectpsilas changing level of alertness, indexed by subjectpsilas behavioral response in the driving task. This approach could lead to a practical system for noninvasive monitoring of the cognitive state of human operators in attention-critical settings.

关键词： Electroencephalography Brain modeling Brain models Distance measurement Correlation Spectral analysis Data models

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