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American control Conference

作者： Masashi Wakaiki Masaki Ogura Joao P. Hespanha the Department of Electrical and Electronic Engineering Chiba University 1-33 Yayoi-cho Inage-ku Chiba 263-8522 Japan the Department of Electrical and Systems Engineering at the University of Pennsylvania Philadelphia PA 19104 USA the Center for Control Dynamical-systems and Computation (CCDC) University of California Santa Barbara CA 93106 USA

ISBN: (纸本)9781509045839

We study optimal control for sampled-data systems with stochastic delays. Assuming that the delays can be modeled by a Markov chain and can be measured by controllers, we design a control law that minimizes an infinite-horizon continuous-time quadratic cost function. The resulting optimal control law can be efficiently computed offline by the iteration of a certain Riccati difference equation. We also obtain sufficient conditions in terms of linear matrix inequalities for stochastic stabilizability and detectability, which are used for the optimal controller design.

关键词： optimal controller design controllers data systems delay control law Data sampling linear quadratic control Markov chain Optimal Optimal control controller design Stochastic Difference equation linear matrix inequalities detectability iterative methods

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Supervisory control of Discrete-event Systems under Attacks

arXiv

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arXiv 2017年

作者： Wakaiki, Masashi Tabuada, Paulo Hespanha, João P. Graduate School of System Informatics Kobe University Kobe657-8501 Japan Department of Electrical Engineering University of California Los AngelesCA90095-1594 United States Center for Control Dynamical-systems and Computation University of California Santa BarbaraCA93106-2560 United States

We consider a multi-adversary version of the supervisory control problem for discrete-event systems, in which an adversary corrupts the observations available to the supervisor. The supervisor’s goal is to enforce a specific language in spite of the opponent’s actions and without knowing which adversary it is playing against. This problem is motivated by applications to computer security in which a cyber defense system must make decisions based on reports from sensors that may have been tampered with by an attacker. We start by showing that the problem has a solution if and only if the desired language is controllable (in the Discrete event system classical sense) and observable in a (novel) sense that takes the adversaries into account. For the particular case of attacks that insert symbols into or remove symbols from the sequence of sensor outputs, we show that testing the existence of a supervisor and building the supervisor can be done using tools developed for the classical DES supervisory control problem, by considering a family of automata with modified output maps, but without expanding the size of the state space and without incurring on exponential complexity on the number of attacks considered. Copyright © 2017, The Authors. All rights reserved.

关键词： Game theory

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Universal quantum computation with temporal-mode bilayer square lattices

arXiv

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arXiv 2017年

作者： Alexander, Rafael N. Yokoyama, Shota Furusawa, Akira Menicucci, Nicolas C. Center for Quantum Information and Control University of New Mexico MS C07-4220 AlbuquerqueNM87131-0001 United States Department of Physics University of Virginia CharlottesvilleVA22903 United States Centre for Quantum Computation and Communication Technology School of Science RMIT University MelbourneVIC3001 Australia Centre of Quantum Computation and Communication Technology School of Engineering and Communication Technology University of New South Wales CanberraACT2600 Australia Department of Applied Physics School of Engineering University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-8656 Japan

We propose an experimental design for universal continuous-variable quantum computation that incorporates recent innovations in linear-optics-based continuous-variable cluster state generation and cubic-phase gate teleportation. The first ingredient is a protocol for generating the bilayer-square-lattice cluster state (a universal resource state) with temporal modes of light. With this state, measurement-based implementation of Gaussian unitary gates requires only homodyne detection. Second, we describe a measurement device that implements an adaptive cubic-phase gate, up to a random phase-space displacement. It requires a two-step sequence of homodyne measurements and consumes a (non-Gaussian) cubic-phase state. Copyright © 2017, The Authors. All rights reserved.

关键词： Crystal lattices

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Hitting time for doubly-weighted graphs with application to robotic surveillance

Hitting time for doubly-weighted graphs with application to ...

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European control Conference

作者： Andrea Carron Rushabh Patel Francesco Bullo Department of Information Engineering University of Padova Via Gradenigo 6/a 35131 Padova Italy Department of Mechanical Engineering Center for Control Dynamical Systems and Computation College of Engineeringm University of California at Santa Barbara USA

ISBN: (纸本)9781509025923

This article provides analysis results for the weighted hitting time and the pairwise weighted hitting time of a Markov chain. This concepts are useful in many applications from robotics to patrolling, environment monitoring and resources optimization. The aforementioned quantities are a performance indexes which measure the expected time taken by a random walker to travel from an arbitrary node of a graph to a second randomly selected node and the expected time to travel between two chosen nodes. These metrics can be used as objective function in optimization problems. In fact we propose a numerical example applied to robotic surveillance where the weighted hitting time is our cost to minimize with respect to the transition matrix of the agent.

关键词： Hitting time doubly-weighted graphs application

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L2-gain analysis of regenerative switched linear systems with sampled-data state-feedback control

L2-gain analysis of regenerative switched linear systems wit...

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American control Conference (ACC)

作者： Masaki Ogura Masashi Wakaiki João P. Hespanha Victor M. Preciado Department of Electrical and Systems Engineering University of Pennsylvania PA USA Department of Electrical and Electronic Engineering Chiba University Chiba Japan Center for Control Dynamical-systems and Computation (CCDC) University of Carifornia Santa Barbara CA USA

In this paper, we analyze the L 2 -gain of a class of switched linear systems under sampled-data state-feedback control. We consider switched linear systems whose switching signal is a regenerative process. Using the lifting approach and piecewise-constant approximations, we derive a sequence whose limit inferior upper-bounds the L 2 -gain of the closed-loop system. Each term of the sequence can be found by solving a linear matrix inequality. We illustrate the results by the L 2 -gain analysis of a linear system with a failure-prone controller.

关键词： Linear systems Switches Markov processes Random variables Modeling

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L2-gain analysis of systems with clock offsets

L2-gain analysis of systems with clock offsets

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American control Conference

作者： Masashi Wakaiki Kunihisa Okano Joao P. Hespanha Department of Electrical and Electronic Engineering Chiba University 1-33 Yayoi-cho Inage-ku 263-8522 Japan Center for Control Dynamical-systems and Computation (CCDC) University of California Santa Barbara 93106-9560 USA

ISBN: (纸本)9781467386838

In this paper, we analyze the L2-gain of sampled-data systems with asynchronous sensing and control. The closed-loop system has time-varying clock offsets and sampling intervals and can be modeled as a parameter-uncertain system. We use a lifting approach and a gridding and norm-bounded approach in order to analyze intersample behavior and deal with parameter uncertainty, respectively. An upper bound on the L~2-gain is derived via linear matrix inequalities. We illustrate the proposed method by applying it to an active suspension system.

关键词： Linear matrix inequalities Clocks Closed loop systems Time-varying systems Delays Stability analysis Upper bound Closed loop systems Timing devices linear matrix inequalities time-varying systems Upper bound Stability analysis clock skew System analyses delay offsets Active Suspension Systems gridding

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Experimental and numerical investigation of static and dynamic vortex generators on an airfoil with a deflected flap 8

Experimental and numerical investigation of static and dynam...

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8th AIAA Flow control Conference, 2016

作者： Rice, Thomas T. Cummings, R. Clingman, D.J. Sahni, O. Amitay, M. Center for Flow Physics and Control Rensselaer Polytechnic Institute TroyNY12180 United States Scientific Computation Research Center Rensselaer Polytechnic Institute TroyNY12180 United States Boeing Research and Technology The Boeing Company PO Box 3707 SeattleWA98124 United States Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute TroyNY12180 United States Aerospace Enginering Rensselaer Polytechnic Institute TroyNY12180 United States

ISBN: (数字)9781624104329

ISBN: (纸本)9781624104329

Flow separation can be detrimental in a variety of aerospace applications. A traditional method of preventing or delaying flow separation has been static vortex generators. They are effective in mitigating flow separation, however, they can impose a drag penalty during certain flow regimes, e.g., when the flow is not separated. An alternative to a static vortex generator (SVG) is a dynamic vortex generator (DVG), which can be deployed into the flow when needed and retracted when not needed. Additionally, a DVG can be oscillated about a mean height with a specified amplitude and frequency to target certain frequencies that may be present in the flow, which can make it more effective. An experimental and numerical investigation was conducted on a modified NACA 0012 airfoil with flap deflections of 20° and 30° to study the effectiveness of VGs on flow reattachment over the flap. Simulations were conducted using the unsteady Reynolds averaged Navier-Stokes (URANS) equations together with the Spalart-Allmaras turbulent model. In the simulations, flap deflections of 20° and 30° were considered, while the experiments focused on the flap deflection of 20°. For the flap deflection of 30°, both the baseline and SVG cases were simulated while for the flap deflection of 20° only a baseline simulation was carried out. For the SVG, a parametric numerical study was performed in which chord-wise location and height of the VGs were varied to guide the experiments in terms of VG location and height. SVGs were found to increase the lift-to-drag ratio and reduce fluctu-ating forces. Taller VGs were found to be more effective while VGs placed at XVG = 0.53 resulted in a similar effectiveness at two Reynolds numbers. For the flap deflection of 20°, experimental and numerical data showed a good agreement for the baseline case. In the experiments, the distributions of the pressure around the airfoil were measured at different spanwise locations for the baseline, SVG and DVG cases at the fl

关键词： Flow separation

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26th Annual computational Neuroscience Meeting (CNS*2017): Part 3 Antwerp, Belgium. 15-20 July 2017 Abstracts

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 95-176页

作者： [Anonymous] Department of Neuroscience Yale University New Haven CT 06520 USA Department Physiology & Pharmacology SUNY Downstate Brooklyn NY 11203 USA NYU School of Engineering 6 MetroTech Center Brooklyn NY 11201 USA Departament de Matemàtica Aplicada Universitat Politècnica de Catalunya Barcelona 08028 Spain Institut de Neurobiologie de la Méditerrannée (INMED) INSERM UMR901 Aix-Marseille Univ Marseille France Center of Neural Science New York University New York NY USA Aix-Marseille Univ INSERM INS Inst Neurosci Syst Marseille France Laboratoire de Physique Théorique et Modélisation CNRS UMR 8089 Université de Cergy-Pontoise 95300 Cergy-Pontoise Cedex France Department of Mathematics and Computer Science ENSAT Abdelmalek Essaadi’s University Tangier Morocco Laboratory of Natural Computation Department of Information and Electrical Engineering and Applied Mathematics University of Salerno 84084 Fisciano SA Italy Department of Medicine University of Salerno 84083 Lancusi SA Italy Dipartimento di Fisica Università degli Studi Aldo Moro Bari and INFN Sezione Di Bari Italy Data Analysis Department Ghent University Ghent Belgium Coma Science Group University of Liège Liège Belgium Cruces Hospital and Ikerbasque Research Center Bilbao Spain BIOtech Department of Industrial Engineering University of Trento and IRCS-PAT FBK 38010 Trento Italy Department of Data Analysis Ghent University Ghent 9000 Belgium The Wellcome Trust Centre for Neuroimaging University College London London WC1N 3BG UK Department of Electronic Engineering NED University of Engineering and Technology Karachi Pakistan Blue Brain Project École Polytechnique Fédérale de Lausanne Lausanne Switzerland Departement of Mathematics Swansea University Swansea Wales UK Laboratory for Topology and Neuroscience at the Brain Mind Institute École polytechnique fédérale de Lausanne Lausanne Switzerland Institute of Mathematics University of Aberdeen Aberdeen Scotland UK Department of Integrativ

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26th Annual computational Neuroscience Meeting (CNS*2017) of the Organization for computational Neuroscience Antwerp, Belgium, July 15-20, 2017

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BMC NEUROSCIENCE 2017年第SUPPL 1期18卷 59-59页

作者： [Anonymous] Indiana University Purdue University Indianapolis Indianapolis IN 46032 USA Stark Neurosciences Research Institute Indiana University School of Medicine Indianapolis IN 46032 USA Department of Mathematics East Carolina University Greenville NC 27858 USA Jülich Supercomputing Centre Forschungszentrum Jülich 52425 Jülich Germany Future Systems Swiss National Supercomputing Centre 8092 Zurich Switzerland User Engagement and Support Swiss National Supercomputing Centre 6900 Lugano Switzerland Institut de Neurosciences des Systèmes Aix Marseille Univ 13005 Marseille France Simulation Lab Neuroscience Forschungszentrum Jülich Jülich Germany Department of Experimental Psychology Ghent University 9000 Ghent Belgium Donders Center for Cognitive Neuroimaging Radboud University 6525HR Nijmegen The Netherlands Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO 80309 USA Department of Neurosurgery Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Neurology Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Otolaryngology Johns Hopkins School of Medicine Baltimore MD 21287 USA INSERM U968 Paris France Sorbonne Universités UPMC University Paris 06 UMR_S 968 Institut de la Vision Paris France CNRS UMR_7210 Paris France Department of Computer Architecture and Technology University of Granada (CITIC) Granada Spain Sorbonne Universités UPMC Univ Paris 06 INSERM CNRS Institut de la Vision Paris France Department of Adaptive Machine Systems Osaka University Osaka Japan Department of Computer Science University of Cergy-Pontoise Cergy-Pontoise France Department of Physics and Astronomy College of Charleston Charleston SC 29424 USA School of Physics Faculty of Science University of Sydney Sydney NSW 2006 Australia Center of Excellence for Integrative Brain Function Australian Research Council Sydney Australia Max Planck Institute for Human Cognitive and Brain Sciences Saxony Lei

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A Solvability Condition for Reactive Power Flow

A Solvability Condition for Reactive Power Flow

引用

IEEE Annual Conference on Decision and control

作者： John W. Simpson-Porco Florian Dorfler Francesco Bullo Department of Mechanical Engineering and the Center for Control Dynamical Systems and Computation University of California Santa Barbara Automatic Control Laboratory ETH Zurich 8092 Zurich Switzerland

ISBN: (纸本)9781479978878

A central question in the analysis and operation of power networks is the feasibility of a unique high-voltage solution to the power flow equations satisfying operational constraints. For planning, monitoring, and contingency analysis in transmission networks, the high-voltage solution of these nonlinear equations can be constructed only numerically or roughly approximated using a linear DC power flow. In this work we analytically study the solvability of the nonlinear decoupled reactive power flow equations, and present a solvability condition relating the existence of a unique high-voltage solution to the spatial distribution of loading and the effective impedances between load buses. We validate the accuracy and applicability of our results through standard power network test cases.

关键词： Reactive power Mathematical model Generators Load modeling Power system stability Loading Numerical stability

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