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Prescribed-Time control of Stochastic Nonlinear Systems with Reduced control effort

Journal of Systems Science & Complexity 2021年第5期34卷 1782-1800页

作者： LI Wuquan KRSTIC Miroslav School of Mathematics and Statistics Science Ludong UniversityYantai 264025China Department of Mechanical and Aerospace Engineering University of CaliforniaSan DiegoLa JollaCA 92093USA

A new prescribed-time state-feedback design is presented for stochastic nonlinear strictfeedback *** from the existing stochastic prescribed-time design where scaling-free quartic Lyapunov functions or scaled quadratic Lyapunov functions are used,the design is based on new scaled quartic Lyapunov *** designed controller can ensure that the plant has an almost surely unique strong solution and the equilibrium at the origin of the plant is prescribed-time mean-square *** that,the authors redesign the controller to solve the prescribed-time inverse optimal mean-square stabilization *** merit of the design is that the order of the scaling function in the controller is reduced dramatically,which effectively reduces the control *** simulation examples are given to illustrate the designs.

关键词： control effort prescribed-time design stochastic nonlinear strict-feedback systems

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control effort Reduction in Output-Feedback Stabilization for A Class of Stochastic Nonlinear Systems

Control Effort Reduction in Output-Feedback Stabilization fo...

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第二十七届中国控制会议

作者： Duan Na1,Xie Xuejun1,2 1.School of Electrical Engineering&Automation,Xuzhou Normal University,Xuzhou 221116,P.R.China 2.Institute of Automation,Qufu Normal University,Qufu Shandong 273165,P.R.China

This paper considers a class of stochastic nonlinear systems with linearly bounded unmeasurable states from the viewpoint of reducing the control *** main work consists of the following aspects:（1） By choosing an output-feedback controller with an improved algorithm of choosing critical value for gain parameter,we show that the critical value for gain parameter of observer is smaller than that obtained by the existing work without imposing any additional ***,less control effort and rate of change of the controller are required.（2） The designed output-feedback controller maintains that the closed-loop system is bounded in probability,the equilibrium at the origin is globally asymptotically stable（GAS） in probability.（3） The problem of inverse optimal stabilization in probability is also *** example demonstrates the effectiveness of the control scheme.

关键词： Stochastic nonlinear systems Output-Feedback stabilization control effort Critical value

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Chaos control of the power system via sliding mode based on fuzzy supervisor

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International Journal of Intelligent Computing and Cybernetics 2017年第1期10卷 68-79页

作者： Ahmad Sarani Ali Abadi Saeed Balochian Department of Electrical Engineering Gonabad BranchIslamic Azad UniversityGonabadIran

Purpose-The purpose of this paper is to address the problem of control in a typical chaotic power *** oscillations cannot only extremely endanger the stabilization of the power system but they can also not be controlled by adding the traditional ***,the sliding mode control based on a fuzzy supervisor can sufficiently ensure perfect tracking and controlling in the presence of ***-loop stability is proved using the Lyapunov stability *** simulation results show the effectiveness of the proposed method in damping chaotic oscillations of the power system,eliminating control signal chattering and also show less control effort in comparison with the methods considered in previous ***/methodology/approach-The sliding mode control based on a fuzzy supervisor can sufficiently ensure perfect tracking and controlling in the presence of ***-loop stability is proved using the Lyapunov stability ***-Closed-loop stability is proved using the Lyapunov stability *** simulation results show the effectiveness of the proposed method in damping chaotic oscillations of power system,eliminating control signal chattering and also less control effort in comparison with the methods considered in previous ***/value-Main contributions of the paper are as follows:the chaotic behavior of power systems with two uncertainty parameters and tracking reference signal for the control of generator angle and the controller signal are discussed;designing sliding mode control based on a fuzzy supervisor in order to practically implement for the first time;while the generator speed is constant,the proposed controller will enable the power system to go in any desired trajectory for generator angle at first time;stability of the closed-loop sliding mode control based on the fuzzy supervisor system is proved using the Lyapunov stability theory;simulation of the proposed controller shows that t

关键词： Fuzzy logic Stability Robust control Nonlinear control Adaptive control Fuzzy supervisor Chaotic power system Lyapunov control effort

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Cutaneous leishmaniasis control in Alta Verapaz (northern Guatemala): evaluating current efforts through stakeholders' experiences

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Infectious Diseases of Poverty 2021年第3期10卷 14-25页

作者： Renata Mendizabal-Cabrera Isabel Perez Victor Becerril Montekio Freddy Perez Erick Duran Mei L.Trueba Center for Health Studies(CHS) Universidad del Valle de Guatemala(UVG)18 Avenida 11-95zona 15V.H.3Guatemala CityGuatemala Instituto Nacional de Salud Publica(INSP) CuernavacaMexico Communicable Diseases and Environmental Determinants of Health Department Pan American Health OrganizationWashingtonDCUSA. Leishmaniasis Sub-Program National Ministry of Health of GuatemalaGuatemala CityGuatemala Department of Global Health and Infection(GHI) Brighton and Sussex Medical School(BSMS)University of SussexBrightonUK.

Background:Cutaneous leishmaniasis(CL),endemic in Guatemala,mostly affects poor people living in the northern region.A national control program that ineludes surveillanee,diagnose,and treatment offered free of cost by the Ministry of Health(MoH)has been in place since ***,the incidence is increasing and treatment rates are not optimal,suggesting that current efforts are not being *** study aimed to understand barriers and facilitators of CL control in Guatemala as experienced and perceived by key stakeholders in order to comprehend what works well and does not and suggest evidence-informed ***:The study was conducted in the Coban municipality,the most endemic of Guatemala,situated in the Department of Alta *** were collected during May and June 2019 via focus groups and semi-structured interviews with key stakeholders,including local and national health personnel and residents of four communities of the endemic *** and content analysis of the collected data was conducted using ***:Three overarching issues hamper the effectiveness of current CL efforts:resource scarcity,treatment challenges,and knowledge-action *** economic resources from the MoH and community residents negatively impact incidence,detection of cases and treatment rates in that preventive action is insufficient and healthcare access is *** addition,local health workers often lack specialized CL training and access to the national CL control *** regards to the population living in the study area,misunderstanding of disease causation,shame associated with CL lesions,treatment pain fear,and long(often uncertain)waiting times for diagnose and treatment negatively affect people's willingness to seek help,treatment adherence,and their trust on the healthcare ***:Culturally sensitive CL preventive action must be *** the scarce economic resources available for CL control in the country,the

关键词： Cutaneous leishmaniasis control effort Qualitative evaluation Stakeholders'experiences Alta Verapaz Guatemala

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