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作者：Kaldmae, Arvo; Bartosiewicz, Zbigniew; Kotta, Ulle; Wyrwas, Malgorzata
作者单位：Bialystok University of Technology; Tallinn University of Technology
摘要：The problem of finding a minimal realization of a single-input-single-output nonlinear retarded time-delay input-output equation with constant commensurable delays is addressed. First, an algorithm is given to find an observable realization of dimension n of a nth order input-output equation. Then, this algorithm is modified under two technical assumptions to find a realization of lower dimension, which is observable and accessible. It is shown that under the same technical assumptions an obse...
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作者：Degue, Kwassi Holali; Ny, Jerome Le
作者单位：Universite de Montreal; Polytechnique Montreal; Universite de Montreal
摘要：Large-scale monitoring and control systems increasingly rely on sensitive data obtained from private agents, e.g., location traces collected from the users of intelligent transportation systems. To encourage the participation of these agents, algorithms that process information in a privacy-preserving way are thus needed. This note revisits the Kalman filtering problem, subject to privacy constraints. We aim to enforce differential privacy, a formal state-of-the-art definition of privacy ensur...
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作者：Lu, An-Yang; Yang, Guang-Hong
作者单位：Northeastern University - China; Northeastern University - China
摘要：This article investigates the attack detection and identification problem for cyber-physical systems under sparse sensor attacks. A novel candidate set construction algorithm, where only partial combinations of different channels are checked, is proposed to efficiently generate the candidate set containing all the possible sets of corrupted channels under stealthy attacks. Besides, through introducing a unified attack model that precisely characterizes the attack performance and stealthiness, ...
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作者：Min, Huifang; Shi, Shang; Xu, Shengyuan; Guo, Jian; Zhang, Zhengqiang
作者单位：Nanjing University of Science & Technology; Hohai University; Qufu Normal University
摘要：This study investigates the fixed-time stability of stochastic nonlinear systems described by Ito differential equations. The improved fixed-time Lyapunov theorem is given and an important corollary is obtained. It is proved that the upper-bound estimate of the settling time is less conservative. We establish a new definition of practically fixed-time stability in probability and propose the corresponding Lyapunov criterion theorem. In addition, different cases of the parameters are discussed ...
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作者：Su, Yifan; Wang, Zhaojian; Cao, Ming; Jia, Mengshuo; Liu, Feng
作者单位：Tsinghua University; Shanghai Jiao Tong University; University of Groningen; Swiss Federal Institutes of Technology Domain; ETH Zurich
摘要：Dual decomposition is widely utilized in the distributed optimization of multiagent systems. In practice, the dual decomposition algorithm is desired to admit an asynchronous implementation due to imperfect communication, such as time delay and packet drop. In addition, computational errors also exist when the individual agents solve their own subproblems. In this article, we analyze the convergence of the dual decomposition algorithm in the distributed optimization when both the communication...
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作者：Gheitasi, Kian; Lucia, Walter
作者单位：Concordia University - Canada
摘要：In this technical note, the safety and reference tracking control problems for cyber-physical systems (CPSs) equipped with authenticated communication channels are addressed. In this class of CPSs, network attacks can break the feedback loop at two different points for an arbitrarily long period. In this scenario, we design a novel control architecture that, by taking a worst-case approach, aims to preserve the safety of the systems while minimizing, whenever possible, the tracking performance...
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作者：Kong, He; Sukkarieh, Salah; Arnold, Travis J.; Chen, Tianshi; Mu, Biqiang; Zheng, Wei Xing
作者单位：Southern University of Science & Technology; Southern University of Science & Technology; University of Sydney; Shenzhen Research Institute of Big Data; The Chinese University of Hong Kong, Shenzhen; Shenzhen Research Institute of Big Data; The Chinese University of Hong Kong, Shenzhen; Chinese Academy of Sciences; Academy of Mathematics & System Sciences, CAS; Western Sydney University
摘要：existing works on optimal filtering of linear time invariant (LTI) stochastic systems with arbitrary unknown inputs assume perfect knowledge of the covariances of the noises in the filter design. This is impractical and raises the question of whether and under what conditions one can identify the process and measurement noise covariances (denoted as Q and R, respectively) of systems with unknown inputs. This article considers the identifiability of Q/R using the correlation-based measurement d...
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作者：Liu, Zongcheng; Huang, Jiangshuai; Wen, Changyun; Su, Xiaojie
作者单位：Air Force Engineering University; Northwestern Polytechnical University; Chongqing University; Nanyang Technological University
摘要：In this article, distributed control of uncertain multiagent systems (MAS) with completely unknown nonlinearities, unknown time-varying control coefficients, and multiple unknown control directions is investigated. First, a new theorem with a series of novel Nussbaum functions are presented, which solve the outstanding problem in control of nonlinear systems with unknown time-varying control coefficients and unknown signs. Second, global consensus of MAS with unknown time-varying control coeff...
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作者：Xiao, Wei; Belta, Calin; Cassandras, Christos G.
作者单位：Massachusetts Institute of Technology (MIT); Boston University; Boston University
摘要：This article addresses the problem of safety-critical control for multiagent systems with unknown dynamics in unknown environments. It has been shown that stabilizing affine control systems to desired (sets of) states while optimizing quadratic costs subject to state and control constraints can be reduced to a sequence of quadratic programs (QPs) by using control barrier functions (CBFs) and control Lyapunov functions (CLFs). One of the main challenges in this approach is obtaining accurate sy...
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作者：Li, Xiaoyu; Wu, Yuhu; Zhu, Jiandong
作者单位：Nanjing University of Posts & Telecommunications; Dalian University of Technology; Nanjing Normal University
摘要：In this article, we consider a rendezvous problem for the generalized Cucker-Smale model, which is a double-integrator multiagent system, on complete Riemannian manifolds. With the help of the covariant derivative, parallel transport, and logarithm map on the Riemannian manifold, we design a rendezvous feedback law that enables all agents to converge at a given target in the Riemannian manifold, under some a priori conditions. Furthermore, we consider three concrete complete Riemannian manifol...
