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Xiao Lu,Yuanyu Cai,Guilin Zhang,Hongxia Wang,Haixia Wang,Xiao Liang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.5
This paper considers optimal control problem for networked control systems (NCSs) with Markovian packet dropouts. Since previous literatures generally consider the one-way Markovian packet dropouts, i.e., from the sensor to the estimator or from the controller to the actuator. To make a further study of this issue, we aim to give the complete solution to the control problem of the two-way Markovian packet dropouts, i.e., from the sensor to the estimator and from the controller to the actuator. Firstly, by applying the Pontryagin’s maximum principle and mathematical induction method, a solution to the forward and backward stochastic difference equations (FBSDEs) is derived. Secondly, in virtue of the solution to the FBSDEs, we obtain the necessary and sufficient condition for the optimal control problem. Thirdly, the optimal controller is given based on the complete square method. Finally, numerical examples are proposed to illustrate the effectiveness of the theoretical results.
Antimicrobial compounds from marine actinomycetes
Cong Wang,Yuanyu Lu,Shugeng Cao 대한약학회 2020 Archives of Pharmacal Research Vol.43 No.7
Marine actinomycetes were the main origin ofmarine natural products in the past 40 years. This review wasto present the sources, structures and antimicrobial activitiesof 313 new natural products from marine actinomycetesreported from 1976 to 2019.