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作者：Gui, Haichao
作者单位：Beihang University
摘要：The spacecraft attitude tracking problem is addressed with actuator faults and uncertainties among inertias, external disturbances, and, in particular, state estimates. A continuous sliding-mode attitude controller is designed using attitude and angular velocity estimates from an arbitrary stable stand-alone observer. Rigorous analysis shows that the controller ensures robust stability of the entire closed-loop system as long as the observer yields state estimates with uniformly ultimately bou...
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作者：Poveda, Jorge, I; Krstic, Miroslav
作者单位：University of Colorado System; University of Colorado Boulder; University of California System; University of California San Diego
摘要：This article introduces a new class of nonsmooth extremum seeking controllers (ESCs) with convergence bounds given by class-KL functions that have a uniformly bounded settling time. These ESCs are characterized by nominal average systems that render uniformly globally fixed-time stable (UGFxTS), the set of minimizers of the response map of a stable nonlinear plant. Given that, under suitable tuning of the parameters of the controllers, the ESCs inherit the convergence properties of their avera...
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作者：Hou, Qiqiang; Clark, Andrew
作者单位：Worcester Polytechnic Institute
摘要：Submodular maximization has applications in networked control, data summarization, and path planning, among other areas. While several efficient algorithms with provable optimality bounds have been developed for maximizing a single submodular function, the more computationally challenging problem of maximizing the minimum of a set of submodular functions (robust submodular maximization) has received less research attention. In this article, we investigate robust submodular maximization when th...
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作者：Huang, Chi; Wang, Wei; Lu, Jianquan; Kurths, Jurgen
作者单位：Southwestern University of Finance & Economics - China; Taiyuan University of Technology; Chengdu University; Southeast University - China; Potsdam Institut fur Klimafolgenforschung; Humboldt University of Berlin; Saratov State University
摘要：In actual network transmission, data loss due to network congestion and power shortage is unavoidable. However, this phenomenon has not been considered in Boolean networks (BNs) analysis so far. The loss of data is usually random, so BNs with missing data are modeled by introducing Bernoulli distribution sequences. A novel augmented system is constructed to deal with the randomly missing data. The initial states of the BNs are supposed to be chosen from the whole space or only part of it, whic...
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作者：Zhang, Kaiqing; Yang, Zhuoran; Liu, Han; Zhang, Tong; Basar, Tamer
作者单位：University of Illinois System; University of Illinois Urbana-Champaign; University of Illinois System; University of Illinois Urbana-Champaign; Princeton University; Northwestern University; Hong Kong University of Science & Technology
摘要：Despite the increasing interest in multiagent reinforcement learning (MARL) in multiple communities, understanding its theoretical foundation has long been recognized as a challenging problem. In this article, we address this problem by providing a finite-sample analysis for decentralized batch MARL. Specifically, we consider a type of mixed MARL setting with both cooperative and competitive agents, where two teams of agents compete in a zero-sum game setting, while the agents within each team...
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作者：Bhatt, Sujay; Krishnamurthy, Vikram
作者单位：Baidu; Cornell University
摘要：A sequence of social sensors estimates an unknown parameter (modeled as a state of nature) by performing Bayesian social learning, and myopically optimizes individual reward functions. The decisions of the social sensors contain quantized information about the underlying state. How should a fusion center dynamically incentivize the social sensors for acquiring information about the underlying state? This article presents five results. First, sufficient conditions on the model parameters are pr...
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作者：Cacace, Filippo; Germani, Alfredo; Manes, Costanzo
作者单位：University Campus Bio-Medico - Rome Italy; University of L'Aquila
摘要：In this article, we propose an observer for a class of Lipschitz nonlinear systems affected by time-varying and known measurement delays, which is an improvement of the one presented by Cacace et al., 2014. Under the assumption that the delay function is piecewise continuous and differentiable, we prove that exponential convergence to zero of the observation error can be achieved with any desired decay rate, by suitably tuning a gain vector. The delay bound achieved with the observer proposed ...
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作者：Subotic, Irina; Gross, Dominic; Colombino, Marcello; Doerfler, Florian
作者单位：Swiss Federal Institutes of Technology Domain; ETH Zurich; University of Wisconsin System; University of Wisconsin Madison
摘要：In this article, we present a Lyapunov framework for establishing stability with respect to a compact set for a nested interconnection of nonlinear dynamical systems ordered from slow to fast according to their convergence rates, where each of the dynamics is influenced only by the slower dynamics and the successive fastest one. The proposed approach explicitly considers more than two time scales, it does not require modeling multiple time scales via scalar time constants, and provides analyti...
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作者：Tedone, Fabio; Palladino, Michele
作者单位：Gran Sasso Science Institute (GSSI)
摘要：This article proposes a new framework for modeling control systems, in which a dynamic friction occurs. The model consists of a controlled differential inclusion with a discontinuous right-hand side, which still preserves existence and uniqueness of the solution for each given input function u(t). Under general hypotheses, we are able to derive the Hamilton-Jacobi-Bellman equation for the related free-time-optimal control problem and to characterize the value function as the unique locally Lip...
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作者：Harris, Matthew W.
作者单位：Utah System of Higher Education; Utah State University
摘要：This article presents new mathematical results for exact and approximate relaxations of nonconvex optimal control problems defined on disconnected control sets. The exact relaxations are based upon extreme point relaxations wherein the relaxed control set is constructed so that its extreme points belong to the original set. A system property required for exactness is normality. In the absence of normality, control set approximations and system dynamic perturbations are introduced so that norma...
