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作者：Molloy, Timothy L.; Nair, Girish N.
作者单位：University of Melbourne; Australian National University
摘要：In this article, we investigate partially observed Markov decision processes (POMDPs) with cost functions regularized by entropy terms describing state, observation, and control uncertainty. Standard POMDP techniques are shown to offer bounded-error solutions to these entropy-regularized POMDPs, with exact solutions possible when the regularization involves the joint entropy of the state, observation, and control trajectories. Our joint-entropy result is particularly surprising since it consti...
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作者：Mousavi, Alireza; Markazi, Amir H. D.; Ferrara, Antonella
作者单位：Iran University Science & Technology; University of Pavia
摘要：This article considers the design of a minimum-time second-order sliding mode control (SOSMC) method for a class of full-state and input-constrained nonlinear systems. In this study, to enable the handling of the state and input constraints, a barrier-function-based state transformation method is employed to convert the original control problem to an unconstrained control problem. Using the new representation of the system dynamics and the input-state linearization technique, a novel sliding m...
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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：Alghunaim, Sulaiman A.
作者单位：Kuwait University
摘要：Distributed optimization methods with local updates have recently attracted a lot of attention due to their potential to reduce the communication cost of distributed methods. In these algorithms, a collection of nodes performs several local updates based on their local data, and then, they communicate with each other to exchange estimate information. While there have been many studies on distributed local methods with centralized network connections, there has been less work on decentralized n...
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作者：Cao, Ye; Wang, Xinjun; Ma, Yajing; Cao, Jianfu; Song, Yongduan
作者单位：Xi'an Jiaotong University; Shandong Normal University; Nanjing University of Posts & Telecommunications; Chongqing University; Chongqing University
摘要：Most existing fault-tolerant control schemes either are contingent upon timely and accurate fault identification or need to be redesigned whenever the types/phases of actuator failures change, rendering the control design rather complex. In this work, a dynamic hardware redundancy technique with a performance-based trivial fault detector is proposed to accommodate multiple levels of actuator failures, upon which a unified performance-based fault-tolerant control scheme is developed irrespectiv...
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作者：Prasun, Parijat; Kamal, Shyam; Pandey, Sunidhi; Bartoszewicz, Andrzej; Ghosh, Sandip
作者单位：Indian Institute of Technology System (IIT System); Indian Institute of Technology BHU Varanasi (IIT BHU Varanasi); Lodz University of Technology
摘要：In this article, a minimum operator-based law for discrete-time sliding mode control is proposed, which stands between the Gao's reaching law and Utkin's reaching law, alleviating the limitations of both types, i.e., primarily chattering in the former and overly large control action in the latter case. The minimum operator-based discrete-time sliding mode control is designed for first-order and second-order perturbed systems. Further, a minimum operator-based twisting-like algorithm is develop...
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作者：Kim, Junsoo
作者单位：Seoul National University of Science & Technology
摘要：Homomorphic encryption applied to a networked controller enables secure operation, but in most cases it allows for addition and multiplication over integers only, because of computation efficiency. Several related results deal with such constraints by means of re-encrypted controller output, based on which the controller can be reconstructed and operate over integers. This article presents two modified methods based on the output re-encryption, which will further reduce the required communicat...
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作者：Nortmann, Benita; Monti, Andrea; Sassano, Mario; Mylvaganam, Thulasi
作者单位：Imperial College London; Helmholtz Association; German Aerospace Centre (DLR)
摘要：Determining feedback Nash equilibrium solutions of nonzero-sum dynamic games is generally challenging. In this article, we propose four different iterative algorithms to find Nash equilibrium strategies for discrete-time linear quadratic games. The strategy update laws are based on the solution of either Lyapunov or Riccati equations for each player. Local convergence criteria are discussed. Motivated by the fact that in many practical scenarios each player in the game may have access to diffe...
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作者：Zheng, Jun; Zhu, Guchuan
作者单位：Southwest Jiaotong University; Universite de Montreal; Polytechnique Montreal
摘要：In this note, we study the global input-to-state stability (ISS) of the viscous Burgers' equation with respect to Dirichlet boundary disturbances. More specifically, under the assumption that the reaction coefficient is strictly less than pi(2), we establish first the global ISS in the spatial L-infinity-norm for the viscous Burgers' equation with Dirichlet boundary disturbances. Then, under the assumption that the reaction coefficient is nonpositive (and respectively strictly negative), we es...
