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IEEE Conference on control Technology and Applications (CCTA)

作者： Qing Zheng Linda Q. Gao Zhiqiang Gao The Center for Advanced Control Technologies Department of Electrical and Computer Engineering Cleveland State University Cleveland OH USA Department of Mathematics North Central College Naperville IL USA

This paper is concerned with the question of, for a physical plant to be controlled, whether or not its internal dynamics and external disturbances can be realistically estimated in real time from its input-output data. A positive answer would have significant implications on control system design, because it means that an accurate model of the plant is perhaps no longer required. Based on the linear extended state observer (LESO), it is shown that, for a nth order plant, the answer to the above question is indeed yes. In particular, it is shown that the estimation error (1) converges to the origin asymptotically when the model of the plant is given; (2) is bounded and inversely proportional to the bandwidth of the observer when the plant model is mostly unknown. Note that this is not another parameter estimation algorithm in the framework of adaptive control. It applies to a large class of nonlinear, time-varying processes with unknown dynamics. The solution is deceivingly simple and easy to implement. The results of the mathematical analysis are verified in a simulation study and a motion control hardware test.

关键词： control system synthesis Observers Estimation error Bandwidth Parameter estimation Adaptive control Mathematical analysis Analytical models Motion control Hardware

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A Survey on Quantum Cryptographic Protocols and Their Security

A Survey on Quantum Cryptographic Protocols and Their Securi...

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Canadian Conference on electrical and computer engineering (CCECE)

作者： Chi-Hang Fred Fung Hoi-Kwong Lo Center for Quantum Information and Quantum Control Edward S. Rogers Sr. Department of Electrical and Computer Engineering and Department of Physics University of Toronto Toronto ONT Canada

Communications in secrecy are often required in many commercial and military applications. Unfortunately, many cryptographic schemes in use today such as public-key cryptography based on the RSA algorithm would be broken with either unanticipated advances in hardware and algorithm or the advent of quantum computers. Quantum cryptography, on the other hand, has been proven secure even against the most general attack allowed by the laws of physics and is a promising technology poised for widespread adoption in realistic cryptographic applications. Quantum cryptography allows two parties to expand on a secret key that they have previously shared. Various quantum cryptographic protocols have been proposed to perform this task. In this paper, we survey some popular quantum cryptographic protocols (including the famous Bennett-Brassard 1984 protocol) and discuss their security. Specifically, we consider their security in two cases: the ideal case where a perfect single-photon source is used and the practical case where a realistic laser source is used. We compare the protocols and find that the efficient six-state protocol outperforms the others both in the tolerable quantum bit error rate and in the key generation rate when a realistic laser source is used.

关键词： Cryptographic protocols Security Military computing Application software Quantum computing Military communication Public key cryptography Hardware Physics Bit error rate

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Cooperative Graph-Based Model Predictive Search

Cooperative Graph-Based Model Predictive Search

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Proceedings of the 46th IEEE Conference on Decision and control, Pages 5971-6447

作者： James R. Riehl Gaemus E. Collins Joao P. Hespanha Center for Control Dynamical Systems and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA USA Toyon Research Corporation Goleta CA USA

ISBN: (纸本)9781424414970;1424414970

We present a receding-horizon cooperative search algorithm that jointly optimizes routes and sensor orientations for a team of autonomous agents searching for a mobile target. By sampling the region of interest at locations with high target probability, we reduce the continuous search problem to an optimization on a finite graph. Paths are computed on this graph using a receding horizon approach, in which the horizon is a fixed number of waypoints. To facilitate a fair comparison between paths of varying length on a non-uniform graph, we use an optimization criterion corresponding to the probability of finding the target per unit time. Using this algorithm, we show that the team discovers the target in finite time with probability one. Simulations verify that this algorithm makes effective use of agents and performs significantly better than previously proposed search algorithms. We have also successfully tested this search algorithm on a physical system consisting of two UAVs with gimbal-mounted cameras.

关键词： SEARCHING ALGORITHM optimal criterion maneuvering target Horizon Intelligent agents Probability Line graph Targets algorithms region of interest Teams Paths continuous search Byways

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Filtering of discrete linear repetitive processes with ∞ and 2-∞ performance

Filtering of discrete linear repetitive processes with ∞ an...

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2007 IEEE International Symposium on Circuits and Systems, ISCAS 2007

作者： Ligang, Wu Lam, James Paszke, Wojciech Galkowski, Krzysztof Rogers, Eric Kummert, Anton Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin 150001 China Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong Hong Kong Institute of Control and Computation Engineering University of Zielona Góra 65-246 Zielona Góra Poland School of Electronics and Computer Science University of Southampton Southampton SO17 IBJ United Kingdom University of Wuppertal Faculty of Electrical Information and Media Engineering Communication Theory

This paper considers the general filtering problem for a distinct class of two-dimensional (2-D) discrete linear systems, i.e. information propagation in two independent directions, known as discrete linear repetitive processes which are of both system-theoretic and applications interest. In particular, new results on the design of filters with guaranteed levels of performance are developed. These take the form of algorithms for the design of an ∞ and 2-∞ dynamic output feedback filter which guarantees that the resulting filtering error process is stable and has prescribed disturbance attenuation performance as measured by ∞ and 2- ∞ norms. © 2007 IEEE.

关键词： Signal filtering and prediction

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UNITING LOCAL AND GLOBAL OUTPUT FEEDBACK controlLERS

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IFAC Proceedings Volumes 2007年第12期40卷 492-497页

作者： Christophe Prieur Andrew R. Teel LAAS–CNRS 7 Avenue du Colonel Roche 31077 Toulouse Cedex 4 France Center for Control Dynamical Systems & Computation Department of Electrical and Computer Engineering University of California Santa Barbara CA 93106-9560

We consider control systems for which we know two stabilizing output feedback controllers. One is globally asymptotically stabilizing, while the other one is only locally asymptotically stabilizing. We look for a composite output feedback control law that is equal to the local feedback on a neighborhood of the origin and that is globally asymptotically stabilizing. We insist on using only output feedback controllers to solve this uniting problem. Since we want some robustness with respect to measurement noise, actuator errors and external disturbances, we consider hybrid output feedback controllers, following recent developments in the literature on robustness in hybrid systems. Under an input-output-to-state stability assumption, we exhibit a solution of this uniting problem by means of a dynamic hybrid output feedback controller.

关键词： hybrid systems global stabilization local performance output feedback robustness

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Robust fault detection for discrete-time Markovian jump systems with mode-dependent time-delays

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控制理论与应用（英文版） 2007年第2期5卷 139-144页

作者： Hongru WANG Changhong WANG Shaqshuai MOU Huijun GAO School of Information ＆ Communication Engineering Harbin Engineering University Harbin Heilongjiang 150001 China Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin Heilongjiang 150001 China Department of Electrical and Computer Engineering The University of Alberta Edmonton Alberta T6G 2V4 Canada

This paper investigates a fault detection problem for a class of discrete-time Markovian jump systems with norm-bounded uncertainties and mode-dependent time-delays. Attention is focused on constructing the residual generator based on the filter of which its parameters matrices are dependent on the system mode, that is, the fault detection filter is a Markovian jump system as well. The design of fault detection filter is reduced to H-infinity filtering problem by using H-infinity control theory, which can guarantee the difference between the residual and the fault （or, more generally weighted fault） as small as possible in the context of enhancing the robustness of residual to modeling errors, control inputs and unknown inputs. Sufficient condition for the existence of the above filters is established by means of linear matrix inequalities, which can be readily solved by using standard numerical software. A numerical example is given to illustrate the feasibility of the proposed method.

关键词： Markovian jump system Time-delay Fault detection H-infinity filtering Linear matrix inequality Residual

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Nonlinear robust/adaptive controller design for an air-breathing hypersonic vehicle model

Nonlinear robust/adaptive controller design for an air-breat...

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AIAA Guidance, Navigation, and control Conference 2007

作者： Fiorentini, L. Serrani, A. Bolender, Michael A. Doman, David B. Collaborative Center of Control Science Ohio State University Columbus OH 43210 United States Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States Department of Electrical and Computer Engineering 2015 Neil Ave. United States AIAA United States AFRL/VACA 2210 Eighth St. United States

ISBN: (纸本)1563479044

This paper presents preliminary results on the design of a nonlinear robust controller for an air-breathing hypersonic vehicle model. To overcome the analytical intractability of a dynamical model derived from first principles, a simplified control-oriented model is used for control design. The control-oriented model retains most of the features of the original model, including non-minimum phase characteristic of the flight-path angle dynamics and strong couplings between the engine and flight dynamics, whereas flexibility effects, included in the simulation model, are regarded as a dynamic perturbation. In adopting reduced-complexity models for controller design, the issue of robustness with respect to model uncertainty must be carefully addressed and included at the design level. Dynamic inversion-based design methods do not lend themselves easily to quantitative robustness analysis, due to the complexity of the inverse model of the plant. In this paper, a nonlinear sequential loop-closure approach is adopted to design a dynamic state-feedback controllers that provide stable tracking of velocity and altitude reference trajectories. The approach considered in this paper utilizes a combination of adaptive and robust design methods based on both classic and recently developed nonlinear design tools. Simulation results indicate that the proposed methodology may constitute a feasible approach towards the development of robust nonlinear controllers that satisfactorily address the issue of model uncertainty for this type of applications.

关键词： Adaptive control systems

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A Hierarchical Face Identification System Based on Facial Components

A Hierarchical Face Identification System Based on Facial Co...

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ACS/IEEE International Conference on computer Systems and Applications

作者： Mehrtash T Harandi Majid Nili Ahmadabadi Babak N. Araabi School of cognitive science (SCS) Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

It is generally agreed that faces are not recognized only by utilizing some holistic search among all learned faces, but also through a feature analysis that aimed to specify more important features of each specific face. This paper addresses a novel decision strategy that efficiently uses both holistic and facial component (left eye, right eye, nose and mouth) feature analysis to recognize faces. The proposed algorithm uses the whole face features in the first step of recognition task. If the decision machine fails to assign a class (with high confidence) then the individual facial components are processed and the resulting information are combined with those obtained from the whole face to assign the output. Simulation studies justify the superior performance of the proposed method as compared to that of Eigenface method. Experimental results also show that the proposed system is robust against small errors in facial component extractor.

关键词： Face recognition Humans Facial features Nose Mouth Statistical learning Linear discriminant analysis Principal component analysis Object recognition Vectors

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A hybrid model for face recognition using facial components

A hybrid model for face recognition using facial components

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International Symposium on Signal Processing and Its Applications (ISSPA)

作者： Mehrtash T. Harandi Majid Nili Ahmadabadi Babak N. Araabi School of cognitive science SCS Institute for Studies Theoretical Physics and Mathematics (IPM) Tehran Iran Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424407781

It is generally agreed that faces are not recognized only by utilizing some holistic search among all learned faces, but also through a feature analysis that aimed to specify more important features of each specific face. This paper addresses a novel decision strategy that efficiently uses both holistic and facial component (eye, nose and mouth) feature analysis to recognize faces. The proposed algorithm first performs a holistic search using the whole image features and selects probable candidates for further processing. Then the facial features of these probable candidates are compared and classified with the stored patterns in the train set. Finally the classification results are fused with a weighted majority voting to form the final decision. Simulation studies justify the superior performance of the proposed method as compared to that of Eigenface method.

关键词： Face recognition Facial features Humans Nose Mouth Linear discriminant analysis Lighting Voting Principal component analysis Independent component analysis

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Approach Lighting System Lightning Mitigation and Individual control Cabinet Protection

Approach Lighting System Lightning Mitigation and Individual...

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Annual North-American Power Symposium

作者： James A. Momoh Nadir Wade Arunsi Chuku Lateef L. Baruwa Center for Energy Systems and Control CESaC Howard University College of Medicine Washington D.C. DC USA Center for Energy Systems and Control (CESaC) Howard University Washington DC USA Center for Energy Systems and Control CESaC Department of Electrical and Computer Engineering ECE Howard University College of Medicine USA Dept. of Electrical and Computer Engineering (ECE) Howard University. Air Traffic Systems Division Federal Aviation Administration (FAA) Washington DC USA

The mitigation of the impact of lightning and the individual control cabinet (ICC) protection of an approach lighting system (ALS) against over-voltage is the focus of this paper. It is the objective of this paper to evaluate three proposed ALS topologies and select the grounding configuration which optimally mitigates the high voltage and current levels caused by lightning, as well as to assess the over-voltage reduction capability of a metal-oxide varistor and its ability to provide protection to the individual control cabinet to prevent damage. Simulation of the grounding system of each ALS topology using a sensitivity study, which incorporates changes in conductor and environmental characteristics, is performed to determine the robustness of each ALS topology. Performance of a hands-on destructive test is also carried out to obtain practical results to compare with simulation results. This paper provides the foundation for improving the current ALS grounding and protective measures by updating standards and specifications to promote increased reliability and safety, as well as reduced equipment cost.

关键词： Lightning Lighting control control systems Protection Topology Grounding Varistors Optimal control Voltage control Conductors

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