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Robust /spl Hscr//sub /spl infin// filtering for uncertain discrete-time state-delayed systems

IEEE Transactions on Signal Processing 2001年第8期49卷 1696-1703页

作者： R.M. Palhares C.E. de Souza P.L. Dias Peres Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil Department of Systems and Control Brazil School of Electrical and Computer Engineering State University of Campinas-UNICAMP Campinas Brazil

This paper addresses the problem of robust /spl Hscr//sub /spl infin// filtering for linear discrete-time systems subject to parameter uncertainties in the system state-space model and with multiple time delays in the state variables. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. A methodology is developed to design a stable linear filter that assures asymptotic stability and a prescribed /spl Hscr//sub /spl infin// performance for the filtering error, irrespective of the uncertainty and the time delays. The proposed design is given in terms of linear matrix inequalities, which has the advantage in that it can be implemented numerically very efficiently.

关键词： Filtering Nonlinear filters Delay effects Uncertainty Noise robustness Uncertain systems Linear matrix inequalities Signal design Riccati equations Context modeling

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Fuzzy Bayes predictor in electric load forecasting

Fuzzy Bayes predictor in electric load forecasting

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International Joint Conference on Neural Networks (IJCNN)

作者： M.A. Teixeira G. Zaverucha V.N.A.L. da Silva G.F. Ribeiro Systems Engineering and Computer Science Program Graduate Programs in Engineering COPPE Federal University of Rio de Janeiro Brazil Electric Power Research Center CEPEL CEPEL Brazil

ISBN: (纸本)0780370449

We present the fuzzy Bayes predictor (FBP), a hybrid system for the task of monthly electric load forecasting. The FBP is a modification we introduce in the naive Bayes classifier in order to enable it to predict numerical values. We consider three versions of the FBP, each one with a different dependence among the input data: independence, first-order and second-order dependence. For verifying the efficiency of the FBP's prediction, we compare it with two fuzzy systems and two traditional forecasting methods, Box-Jenkins and Winters exponential smoothing.

关键词： Load forecasting Fuzzy systems Power engineering and energy Smoothing methods Testing Niobium compounds systems engineering and theory Computer science Predictive models Electric variables measurement

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Optimizing fuel consumption on gas transmission networks: evaluation of a heuristic for cyclic systems

Optimizing fuel consumption on gas transmission networks: ev...

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IEEE International Conference on systems, Man and Cybernetics

作者： R.Z. Rios-Mercado Seongbae Kim E.A. Boyd Graduate Program in Systems Engineering Universidad Autónoma de Nuevo León San Nicolas de Los Garza Nuevo Leon Mexico

In this paper we present our computational experience with a heuristic for the problem of minimizing fuel cost on steady-state gas transmission problems on cyclic networks. The procedure is based on a two-stage iterative procedure, where, in a given iteration, gas flow variables are fixed and optimal pressure variables are found via dynamic programming in the first stage. In the second stage, the pressure variables are fixed and an attempt is made to find a set of flow variables that improve the objective function by exploiting the underlying network structure. This work focuses on cyclic network topologies, that is, networks with at least one cycle containing two or more compressor stations. This kind of topologies posses the highest degree of difficulty in real-world problems.

关键词： Fuels Costs Network topology Dynamic programming Fluid flow systems engineering and theory Computer network management engineering management Computer networks Steady-state

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Robust H/spl infin/ filter design for uncertain linear systems with multiple time-varying state delays

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IEEE Transactions on Signal Processing 2001年第3期49卷 569-576页

作者： C.E. de Souza R. Martinez Palhares P.L. Dias Peres Department of Systems and Control Laboratorio Nacional de Computacao Cientifica Petropolis Brazil Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil School of Electrical and Computer Engineering State University of Campinas-UNICAMP Campinas Brazil

The problem of robust H/spl infin/ filtering for continuous-time uncertain linear systems with multiple time-varying delays in the state variables is investigated. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. The aim is to design a stable linear filter assuring asymptotic stability and a prescribed H/spl infin/ performance level for the filtering error system, irrespective of the uncertainties and the time delays. Sufficient conditions for the existence of such a filter are established in terms of linear matrix inequalities, which can be efficiently solved by means of powerful convex programming tools with global convergence assured. An example illustrates the proposed methodology.

关键词： Robustness Nonlinear filters Linear systems Filtering Time varying systems Asymptotic stability Uncertainty Delay effects Sufficient conditions Linear matrix inequalities

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Robust H∞ control for uncertain state-delayed linear systems with Markovian jumping parameters 6

Robust H∞ control for uncertain state-delayed linear system...

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6th European Control Conference, ECC 2001

作者： Palhares, R.M. De Souza, C.E. Peres, P.L.D. Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Av. Dom José Gaspar 500 Prédio 4 Belo Horizonte MG30535-610 Brazil Department of Systems and Control Laboratório Nacional de Computação Científica - LNCC Av. Getúlio Vargas 333 Petrópolis RJ25651-070 Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 Campinas SP13081-970 Brazil

ISBN: (纸本)9783952417362

The problem of robust H∞ state-feedback control design for a class of continuous-time linear systems with Markovian jumping parameters and multiple time-varying delays at the states, and subject to uncertain parameters is addressed in this paper. It is assumed that the jumping parameters are available and the uncertain parameter belong to given convex bounded domains (polytope type uncertainty). A delay-independent sufficient condition assuring robust mean square stability and a prescribed level of H∞ disturbance attenuation for the closed-loop system is established in terms of linear matrix inequalities. © 2001 EUCA.

关键词： Linear matrix inequalities

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Robust H∞ control for uncertain state-delayed linear systems with Markovian jumping parameters

Robust H∞ control for uncertain state-delayed linear system...

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European Control Conference (ECC)

作者： R. M. Palhares C. E. de Souza P. L. D. Peres Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte MG Brazil Department of Systems and Control Laboratorio Nacional de Computacao Cientifica - LNCC Petropolis RJ Brazil Universidade Estadual de Campinas Campinas SP BR

The problem of robust H ∞ state-feedback control design for a class of continuous-time linear systems with Markovian jumping parameters and multiple time-varying delays at the states, and subject to uncertain parameters is addressed in this paper. It is assumed that the jumping parameters are available and the uncertain parameter belong to given convex bounded domains (polytope type uncertainty). A delay-independent sufficient condition assuring robust mean square stability and a prescribed level of H ∞ disturbance attenuation for the closed-loop system is established in terms of linear matrix inequalities.

关键词： Closed loop systems Robustness Uncertainty Attenuation Linear systems Symmetric matrices

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Robust H ∞ control for uncertain discrete-time state-delayed linear systems with markovian jumping parameters 1

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IFAC Proceedings Volumes 2001年第23期34卷 89-94页

作者： Reinaldo M. Palhares Carlos E. de Souza Pedro L.D. Peres Graduate Program in Electrical EngineeringPontifical Catholic University ofMinas Gerais Av. D. José Gaspar 500 30535-610 Belo Horizonte MG Brazil Department of Systems and Control Laboratório Nacional de Computação Científica - LNCCAv. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 13081-970 Campinas Sp Brazil

This paper addresses the problem of robust H ∞ state-feedback control design for uncertain discrete-time linear systems with multiple time delays at the states and Markovian jumping parameters. The jumping parameters are assumed to be available and the uncertainties are supposed to belong to convex bounded domains (polytope type uncertainty). Delay-independent sufficient conditions assuring robust stochastic stability and a prescribed H ∞ disturbance attenuation for the closed-loop uncertain discrete-time linear system with multiple time delays and Markovian jumping parameters are established in terms of linear matrix inequalities, which have the advantage that can be implemented numerically veryefficiently.

关键词： Robust H ∞ control time delay systems Markovian jumping parameters linear matrix inequalities discrete-time systems

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Survey of reduced workload and crewing strategies for ocean patrol vessels

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NAVAL ENGINEERS JOURNAL 2001年第2期113卷 29-44页

作者： Baker, C Krull, R Snyder, G Lincoln, W Malone, TB Clifford C. Baker CIE CHFEP is a senior staff scientist at Carlow International Incorporated. He has applied most of his 24 years of experience in the application of human engineering technology to maritime systems. Mr. Baker has directed much of Carlow's efforts to reduce ship workload and to improve human performance and maritime safety through application of human factors methods and data. He is a Certified Industrial Ergonomist (CIE) as well as a Certified Human Factors Engineering Professional (CHFEP). Both certifications were granted by Oxford Research where Mr. Baker also serves as an Advisory Board member. Russell D. Krull P.E. is a senior engineer with A&T/Proteus Engineering with more than 18 years of experi-ence in marine engineering naval architecture and program management including 16 years of active duty in the U.S. Coast Guard. Recent experience includes advanced ship design studies engineering software development technical support for the USMC Advanced Amphibious Assault Vehicle propulsion systems analyses ship structural engineering and cargo handling systems engineering. Mr. Krull has an M.S.E. in naval architecture and marine engineering and an M.S.E. in industrial and operations engineering from University of Michigan and a B.S. in ocean engineering from the U.S. Coast Guard Academy. Capt. Glenn L. Snyder USCG. Regrettably since this paper was originally written Capt. Snyder has passed away. At the time of his death he was an operations specialist assigned to the Coast Guard's Deepwater Capabilities Replacement Project as Chief of Human Systems Integration. He served as commanding officer of the patrol boat Cape George (WPB-95306) the icebreaking tug Biscayne Bay (WTGB-104) and the cutter Legare (WMEC-911). A 1975 graduate of the U.S. Coast Guard Academy Capt. Snyder held an M.A. in national security and strategic studies from the U.S. Naval War College and an M.A. in international relations from Salve Regina College. In addition he was a 1998 fellow of the Foreign Service

The U.S. Coast Guard is in the concept exploration phase of its Integrated Deepwater System (IDS) acquisition project. This project will define the next generation of surface, air and command, control, communications, computers, intelligence, surveillance, and reconnaissance (C4ISR) assets used to perform the Coast Guard's missions in the IDS environment (>50 NM off the U. S. coastline). As part of early technology investigations, the needs exist to: (1) analyze the workload requirements of the IDS, (2) identify alternative means to perform ship's work, and (3) optimize ship manning consistent with ship workload, performance criteria, and the available tools and equipment aboard. To reduce shipboard work requires an understanding of the mission and support requirements placed on the vessel and crew, how these requirements are currently met, and how requirements might otherwise be met to reduce workload and crew size. This study examined currently implemented workload and manpower reducing approaches of commercial maritime fleets, U.S. and foreign navies, and foreign coastguards. These approaches were analyzed according to evaluation criteria approved by the IDS acquisition project team. From this, strategies for shipboard work reduction that may be considered for adoption by the IDS were identified and analyzed according to performance and costs factors. Ten workload-reducing strategies were identified: damage control, bridge, multiple crewing, engineering, risk acceptance, modularity, deck, enabling technologies, ship/personnel readiness, and operability and maintainability.

关键词： Naval vessels

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Seeing through the fog - Attaining 'full spectrum dominance' with the system-of-systems through operational engineering

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NAVAL ENGINEERS JOURNAL 2000年第4期112卷 101-119页

作者： Bryant, RE Flynn, JE [?]1Russell Bryant is the leader for future decoy development in the Surface Electronic Warfare Systems Program Office Program Executive Office for Theater Surface Combatants. Previously he served as CVN Ship Life Cycle Manager in the Aircraft Carrier Program Office Naval Sea Systems Command. He is a retired reserve Lieutenant Commander with surface warfare nuclear power and naval control of shipping/convoy qualifications. He was commissioned 1976 from the Rensselaer Polytechnic Institute NROTC program with a bachelor of engineering degree in nuclear engineering and minor in history and political science. His active duty service includes USS Mississippi (CGN 40) USS South Carolina (CGN 37) USS Texas (CGN 39) Commander Naval Surface Force Atlantic Fleet (Readiness and Training) staff and Commander Naval Air Force Pacific Fleet (Ship's Material) staff. He graduated in 1997 from the Naval War College College of Naval Command and Staff through the Non-Resident Seminar Program. He graduated in 1998 from the USDA Graduate School Leadership Development Academy Executive Potential Program.

Many discussions and articles address the business and military changes supporting implementation of Joint Vision 2010 and its system-of-systems approach. The dynamics of international military operations and commitments, coupled with accelerating information technologies, can lead to confusion and uncertainty Customary rules recommend caution, even stopping, when confusion and uncertainty are present, yet the needed changes counsel toward accelerated efforts. Currently, systems engineering does not completely address delivering "operational war fighting capabilities," or foster commanders' confidence to fully exploit those capabilities upon delivery. Acquisition reform supports accelerating delivery of systems. likewise, accelerated delivery of "war fighting capabilities" within any opponents' fielding and deployment cycle is imperative. Technical advances in modeling and simulation, utilization concepts, and innovative evaluation methods create an opportunity to facilitate codevelopment of doctrine, operations, and training prior to producing hardware systems. On-line simulation and evaluation tools can overcome the need for physical systems. Specifically, this paper lays out the opportunity to evolve systems engineering to another level, operational engineering, which leverages from the modeling and simulation environment, prior to hardware production. That modeling and simulation paired with coevolution of procedures and on-line analysis will produce a trained customer base, fully prepared for deliveries of "operational war fighting capabilities".

关键词： Warships

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Neuroplastic alterations accompanying long-term depression in the anesthetized rat hippocampus

Neuroplastic alterations accompanying long-term depression i...

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Annual Northeast Bioengineering Conference

作者： J.H. Blaise J.D. Bronzino Biomedical Engineering Graduate Program Electrical & Systems Engr. Department University of Connecticut CT USA University of Connecticut Storrs CT US

The major goals of this study were to: (1) assess whether low-frequency stimulation (LFS) is effective at inducing long-term depression (LTD) of the perforant path/dentate gyrus synapse in the anesthetized adult rat hippocampus, and (2) determine the frequency at which the shift from LTD to LTP occurs. Measures of homosynaptic LTD were recorded in the dentate gyrus during experiments conducted on anesthetized adult rats, Our results indicate that stimulation frequencies lower than or equal to 7 Hz resulted in the induction of LTD of both PSA and EPSP slope measures, with a shift to LTP occurring approximately between 11 and 30 Hz stimulation.

关键词： Neuroplasticity Hippocampus Electrodes Rats Signal analysis Biomedical engineering Biomedical measurements Frequency measurement Pulse measurements Educational institutions

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