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作者：Shakib, Fahim; Scarciotti, Giordano; Jungers, Marc; Pogromsky, Alexander Yu; Pavlov, Alexey; van de Wouw, Nathan
作者单位：Imperial College London; Centre National de la Recherche Scientifique (CNRS); Universite de Lorraine; Eindhoven University of Technology; Norwegian University of Science & Technology (NTNU)
摘要：This article considers the problem of model reduction for Lur'e-type models consisting of a feedback interconnection between linear dynamics and static nonlinearities. We propose an optimal variant of the time-domain moment-matching method in which the H-infinity -norm of the error transfer-function matrix of the linear part of the model is minimized while the static nonlinearities are inherited from the full-order model. We show that this approach also minimizes an error bound on the L-2 -nor...
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作者：Song, Qiang; Meng, Deyuan; Wen, Guanghui; Cao, Jinde; Liu, Fang
作者单位：Huanghuai University; Huanghuai University; Beihang University; Beihang University; Southeast University - China; Southeast University - China; Purple Mountain Laboratories; Ahlia University Bahrain
摘要：This article is devoted to analyzing the equilibrium points and convergent behaviors for a constrained signed network with general topology containing a directed spanning tree, where the output of each agent is restricted by a constraint set. Different from unconstrained signed networks, the rooted subgraph and constraint sets are both critical for the theoretical analysis of the constrained signed network. By utilizing $H$-matrix theories, projection techniques, invariance principle, and an e...
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作者：Deng, Yang; Moulay, Emmanuel; Lechappe, Vincent; Chen, Zhang; Liang, Bin; Plestan, Franck
作者单位：Tsinghua University; Tsinghua University; Centre National de la Recherche Scientifique (CNRS); Universite de Poitiers; Universite Claude Bernard Lyon 1; Centre National de la Recherche Scientifique (CNRS); CNRS - Institute for Engineering & Systems Sciences (INSIS); Ecole Centrale de Lyon; Institut National des Sciences Appliquees de Lyon - INSA Lyon; Centre National de la Recherche Scientifique (CNRS); CNRS - Institute for Information Sciences & Technologies (INS2I); Nantes Universite; Ecole Centrale de Nantes
摘要：This article provides a nonsingular predefined-time terminal sliding mode control scheme for perturbed chains of integrators. Based on the linear delayed feedback technique, a class of nonsingular smooth prescribed-time sliding surfaces with artificial time-delays is constructed, and the control scheme can achieve predefined-time control for perturbed chains of integrators with matched and mismatched disturbances. Especially, for double integrators, an initial-condition-based sufficient condit...
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作者：Ke, Jieming; Wang, Ying; Zhao, Yanlong; Zhang, Ji-Feng
作者单位：Chinese Academy of Sciences; Academy of Mathematics & System Sciences, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
摘要：This article investigates the online identification problem of binary-valued moving average systems. A stochastic approximation-based algorithm without projections or truncations is proposed. To analyze the convergence property of the algorithm, the distribution tail of the parameter estimate is proved to be exponentially convergent through an auxiliary stochastic process. Under uniform persistent excitations, the almost sure and mean square convergence of the algorithm is obtained. When the s...
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作者：Odorico, Elizandra Karla; Bueno, Jose Nuno A. D.; Terra, Marco H.
作者单位：Universidade de Sao Paulo
摘要：The control problem of dynamic systems that undergo sudden changes and rely on past data is known to be challenging to solve and has received a lot of attention in the past years. Meanwhile, the optimal control theory has been widely used to develop efficient conditions for stability analysis and control synthesis. In this article, we propose a robust regulation strategy for Markovian jump linear systems subject to delayed states and polytopic uncertainties. The time-varying delay belongs to a...
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作者：Ye, Lintao; Figura, Martin; Lin, Yixuan; Pal, Mainak; Das, Pranoy; Liu, Ji; Gupta, Vijay
作者单位：Huazhong University of Science & Technology; Huazhong University of Science & Technology; State University of New York (SUNY) System; Stony Brook University; Purdue University System; Purdue University; State University of New York (SUNY) System; Stony Brook University
摘要：Adversarial attacks during training can strongly influence the performance of multiagent reinforcement learning algorithms. It is, thus, highly desirable to augment existing algorithms such that the impact of adversarial attacks on cooperative networks is at least bounded. We consider a fully decentralized network, where each agent receives a local reward and observes the global state and action. We propose a resilient consensus-based actor-critic algorithm, whereby each agent estimates the te...
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作者：Lu, An-Yang; Yang, Guang-Hong
作者单位：Northeastern University - China; Northeastern University - China; Northeastern University - China
摘要：This article investigates the problem of attack detection for cyber-physical systems with input constraints in the presence of command and sensor attacks. For detecting a wider range of attacks, two attack detection strategies are designed, corresponding to the control center side and the controlled system side, respectively. First, from the perspective of the control center, which sends commands and collects measurements, a novel attack detector is designed to detect irregularities by analyzi...
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作者：Zhu, Shouchong; Chen, Wei
作者单位：Peking University; Peking University
摘要：In this article, we unveil majorization inequalities for Poisson- and Bode-type integrals of the singular values of sensitivity and complementary sensitivity functions for multiple-input-multiple-output (MIMO) feedback control systems. These majorization inequalities demonstrate that the evenness of control difficulties in sensitivity and complementary sensitivity reduction across the channels gives a fundamental design constraint. Lower bounds for the evenness are shown to be determined by th...
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作者：Chen, Jian-Hua; Zhou, Hua-Cheng; Han, Zhong-Jie
作者单位：Hunan University of Science & Technology; Central South University; Tianjin University
摘要：In this article, we study a class of integro-differential equation systems with observations in the abstract setting of Hilbert spaces, which fit the second-order integro-differential equation governing the dynamics in isotropic linear viscoelastic materials. Our focus is on infinite-time admissibility of the system observation operators, and sufficient conditions are established using two operator semigroup approaches. An illustrative example is given.
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作者：Meyn, Sean
作者单位：State University System of Florida; University of Florida
摘要：Q-learning has become an important part of the reinforcement learning toolkit since its introduction in the dissertation of Chris Watkins in the 1980s. In the original tabular formulation, the goal is to compute exactly a solution to the discounted-cost optimality equation, and thereby, obtain the optimal policy for a Markov Decision Process. The goal today is more modest: obtain an approximate solution within a prescribed function class. The standard algorithms are based on the same architect...
