Robust LQG problems of discrete-time Markovian jump systems with uncertain noises are investigated. The problem addressed is the construction of perturbation upper bounds on the uncertain noise covariances so as to gu...Robust LQG problems of discrete-time Markovian jump systems with uncertain noises are investigated. The problem addressed is the construction of perturbation upper bounds on the uncertain noise covariances so as to guarantee that the deviation of the control performance remains within the precision prescribed in actual problems. Furthermore, this regulator is capable of minimizing the worst performance in an uncertain case. A numerical example is exploited to show the validity of the method.展开更多
This paper focuses on the methodology analysis for the stability and the corresponding tracking performance of a closed-loop digital jump linear control system with a stochastic switching signal. The method is applied...This paper focuses on the methodology analysis for the stability and the corresponding tracking performance of a closed-loop digital jump linear control system with a stochastic switching signal. The method is applied to a flight control system. A distributed recoverable platform is implemented on the flight control system and subject to independent digital upsets. The upset processes are used to stimulate electromagnetic environments. Specifically, the paper presents the scenarios that the upset process is directly injected into the distributed flight control system, which is modeled by independent Markov upset processes and independent and identically distributed (IID) processes. A theoretical performance analysis and simulation modelling are both presented in detail for a more complete independent digital upset injection. The specific examples are proposed to verify the methodology of tracking performance analysis. The general analyses for different configurations are also proposed. Comparisons among different configurations are conducted to demonstrate the availability and the characteristics of the design.展开更多
This paper is concerned with finite-time H_(∞) filtering for Markov jump systems with uniform quantization. The objective is to design quantized mode-dependent filters to ensure that the filtering error system is not...This paper is concerned with finite-time H_(∞) filtering for Markov jump systems with uniform quantization. The objective is to design quantized mode-dependent filters to ensure that the filtering error system is not only mean-square finite-time bounded but also has a prescribed finite-time H_(∞) performance. First, the case where the switching modes of the filter align with those of the MJS is considered. A numerically tractable filter design approach is proposed utilizing a mode-dependent Lyapunov function, Schur’s complement, and Dynkin’s formula. Then, the study is extended to a scenario where the switching modes of the filter can differ from those of the MJS. To address this situation, a mode-mismatched filter design approach is developed by leveraging a hidden Markov model to describe the asynchronous mode switching and the double expectation formula. Finally, a spring system model subject to a Markov chain is employed to validate the effectiveness of the quantized filter design approaches.展开更多
目的:综合评价咖啡因(CAF)对运动员跳跃能力的作用效果,探究最佳摄入剂量和对不同运动项目的增补效益。方法:检索Web of science等数据库,收集咖啡因对运动员跳跃表现作用的研究文献,运用PEDro量表评价文献质量,运用Stata17.0软件开展...目的:综合评价咖啡因(CAF)对运动员跳跃能力的作用效果,探究最佳摄入剂量和对不同运动项目的增补效益。方法:检索Web of science等数据库,收集咖啡因对运动员跳跃表现作用的研究文献,运用PEDro量表评价文献质量,运用Stata17.0软件开展合并效应量与偏倚分析。结果:整体效应检验发现CAF可显著提高运动员跳跃能力;中剂量片剂或胶囊形式的CAF改善跳跃表现效果明显;足球、橄榄球、排球和其他运动项目组增补效益明显,对橄榄球运动员改善效果最为显著;各组文献均不具备异质性,发表偏倚检验未见异常。结论:摄入咖啡因可显著改善运动员跳跃能力,剂量选择在4~6mg/kg体重范围内最可能增强足球、橄榄球、排球运动员跳跃表现,对其他运动项目组内的运动员有潜在改善效果。展开更多
This paper deals with the H∞ control problems of Markovian jump systems with mode-dependent time delays. First, considering the mode-dependent time delays, a different delay-dependent H∞ performance condition for Ma...This paper deals with the H∞ control problems of Markovian jump systems with mode-dependent time delays. First, considering the mode-dependent time delays, a different delay-dependent H∞ performance condition for Markovian jump systems is proposed by constructing an improved Lyapunov-Krasovskii function. Based on this new H∞ disturbance attenuation criterion, a full-order dynamic output feedback controller that ensures the exponential mean-square stability and a prescribed H∞ performance level for the resulting closed-loop system is designed. Illustrative numerical examples are provided to demonstrate the effectiveness of the proposed approach.展开更多
This paper studies the nonstationary filtering problem of Markov jump system under <span style="white-space:nowrap;"><i>l</i><sub>2</sub> - <i>l</i><sub>...This paper studies the nonstationary filtering problem of Markov jump system under <span style="white-space:nowrap;"><i>l</i><sub>2</sub> - <i>l</i><sub>∞</sub> </span>performance. Due to the difference in propagation channels, signal strength and phase will inevitably change randomly and cause the waste of signals resources. In response to this problem, a channel fading model with multiplicative noise is introduced. And then a nonstationary filter, which receives signals more efficiently is designed. Meanwhile Lyapunov function is constructed for error analysis. Finally, the gain matrix for filtering is obtained by solving the matrix inequality, and the results showed that the nonstationary filter converges to the stable point more quickly than the traditional asynchronous filter, the stability of the designed filter is verified.展开更多
目的:系统总结不同运动干预诱导激活后表现增强(PAPE)的相关研究,为制定适宜的PAPE诱导方案提供参考与启示。方法:检索Web of Science、PubMed、EBSCO、CNKI等数据库的相关文献,通过筛选后共纳入71篇。结果:涉及的运动干预包括深蹲、奥...目的:系统总结不同运动干预诱导激活后表现增强(PAPE)的相关研究,为制定适宜的PAPE诱导方案提供参考与启示。方法:检索Web of Science、PubMed、EBSCO、CNKI等数据库的相关文献,通过筛选后共纳入71篇。结果:涉及的运动干预包括深蹲、奥林匹克举、臀推、硬拉、腿推举、飞轮抗阻训练、超等长跳跃、阻力冲刺跑、全身振动训练、可变阻力训练、聚组训练、血流限制训练12种。结论:以冲刺PAPE为诱导目标时,适宜采用臀推、阻力冲刺跑、高翻以及超等长跳跃;以跳跃PAPE为诱导目标时,适宜采用自由重量深蹲、等长深蹲、分腿蹲结合血流限制训练以及跳深和负重蹲跳;力量水平高的运动员适宜采用全幅度运动方式以及等长深蹲;力量水平低的运动员适宜采用半幅度运动方式、固定器械腿推举以及全身振动训练;适宜将可变阻力训练和聚组训练与传统抗阻训练相结合应用于复合式训练中;飞轮抗阻训练和血流限制训练无需大重量器械即能对机体有较大的刺激效果,可用于赛前激活方案中。展开更多
目的:探究等速运动不同速度、模式下花样跳绳运动对女大学生膝关节屈、伸肌肌力、动态平衡的影响。方法:选取遵义医科大学女大学生30名,随机分为实验组和对照组各15人,两组均参与相同体育课活动,另对实验组进行12周跳绳干预。运用Iso Me...目的:探究等速运动不同速度、模式下花样跳绳运动对女大学生膝关节屈、伸肌肌力、动态平衡的影响。方法:选取遵义医科大学女大学生30名,随机分为实验组和对照组各15人,两组均参与相同体育课活动,另对实验组进行12周跳绳干预。运用Iso Med 2000等速测试系统在干预前后采集受试者角速度为60°/s、200°/s条件向心、离心模式下膝关节屈、伸肌峰值力矩(Peak Torque、PT)及屈、伸肌群峰值力矩比值(hamstring/quadriceps、H/Q)数据;运用YBT平衡测试系统采集双下肢前侧、后内侧和后外侧3个方向最大达到距离及最大达到距离标准化数据,数据处理组内采用配对样本T检验,组间采用独立样本T检验。结果:等速测试中,实验组在60°/s、200°/s条件,向心、离心模式下膝关节屈、伸肌PT值对比均明显大于干预前(P<0.05);实验组、对照组60°/s离心屈肌间、离心模式下伸肌间PT值对比均存在显著差异(P<0.05)。60°/s条件下Hc/Qe值及200°/s条件下He/Qc值对比均存在显著差异(P<0.05)。YBT测试中,实验组双下肢前侧、后内侧、后外侧最大到达距离显著高于干预前(P<0.05),其中双下肢后外侧相较与干预前测试产生非常明显变化(P<0.01);双下肢前侧、后内侧、后外侧YBT标准化结果与对照组相比变化显著(P<0.05),干预后左后外侧、右后内侧、右后外侧实验组YBT标准化结果明显大于对照组(P<0.01)。结论:(1)12周跳绳训练可有效提升女大学生膝关节屈、伸肌肌力。(2)跳绳运动可以改善女大学生的动态平衡能力及运动表现能力。展开更多
In this paper,we study the n-player game and the mean field game under the constant relative risk aversion relative performance on terminal wealth,in which the interaction occurs by peer competition.In the model with ...In this paper,we study the n-player game and the mean field game under the constant relative risk aversion relative performance on terminal wealth,in which the interaction occurs by peer competition.In the model with n agents,the price dynamics of underlying risky assets depend on a common noise and contagious jump risk modeled by a multi-dimensional nonlinear Hawkes process.With a continuum of agents,we formulate the mean field game problem and characterize a deterministic mean field equilibrium in an analytical form under some conditions,allowing us to investigate some impacts of model parameters in the limiting model and discuss some financial implications.Moreover,based on the mean field equilibrium,we construct an approximate Nash equilibrium for the n-player game when n is sufficiently large.The explicit order of the approximation error is also derived.展开更多
文摘Robust LQG problems of discrete-time Markovian jump systems with uncertain noises are investigated. The problem addressed is the construction of perturbation upper bounds on the uncertain noise covariances so as to guarantee that the deviation of the control performance remains within the precision prescribed in actual problems. Furthermore, this regulator is capable of minimizing the worst performance in an uncertain case. A numerical example is exploited to show the validity of the method.
基金Project supported by the Young Scientists Fund of the National Natural Science Foundation of China(Grant No.61403395)the Natural Science Foundation of Tianjin,China(Grant No.13JCYBJC39000)+2 种基金the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry,Chinathe Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance in Civil Aviation of China(Grant No.104003020106)the Fund for Scholars of Civil Aviation University of China(Grant No.2012QD21x)
文摘This paper focuses on the methodology analysis for the stability and the corresponding tracking performance of a closed-loop digital jump linear control system with a stochastic switching signal. The method is applied to a flight control system. A distributed recoverable platform is implemented on the flight control system and subject to independent digital upsets. The upset processes are used to stimulate electromagnetic environments. Specifically, the paper presents the scenarios that the upset process is directly injected into the distributed flight control system, which is modeled by independent Markov upset processes and independent and identically distributed (IID) processes. A theoretical performance analysis and simulation modelling are both presented in detail for a more complete independent digital upset injection. The specific examples are proposed to verify the methodology of tracking performance analysis. The general analyses for different configurations are also proposed. Comparisons among different configurations are conducted to demonstrate the availability and the characteristics of the design.
基金Project supported by the Natural Science Foundation of the Anhui Higher Education Institutions (Grant Nos. KJ2020A0248 and 2022AH050310)。
文摘This paper is concerned with finite-time H_(∞) filtering for Markov jump systems with uniform quantization. The objective is to design quantized mode-dependent filters to ensure that the filtering error system is not only mean-square finite-time bounded but also has a prescribed finite-time H_(∞) performance. First, the case where the switching modes of the filter align with those of the MJS is considered. A numerically tractable filter design approach is proposed utilizing a mode-dependent Lyapunov function, Schur’s complement, and Dynkin’s formula. Then, the study is extended to a scenario where the switching modes of the filter can differ from those of the MJS. To address this situation, a mode-mismatched filter design approach is developed by leveraging a hidden Markov model to describe the asynchronous mode switching and the double expectation formula. Finally, a spring system model subject to a Markov chain is employed to validate the effectiveness of the quantized filter design approaches.
文摘目的:综合评价咖啡因(CAF)对运动员跳跃能力的作用效果,探究最佳摄入剂量和对不同运动项目的增补效益。方法:检索Web of science等数据库,收集咖啡因对运动员跳跃表现作用的研究文献,运用PEDro量表评价文献质量,运用Stata17.0软件开展合并效应量与偏倚分析。结果:整体效应检验发现CAF可显著提高运动员跳跃能力;中剂量片剂或胶囊形式的CAF改善跳跃表现效果明显;足球、橄榄球、排球和其他运动项目组增补效益明显,对橄榄球运动员改善效果最为显著;各组文献均不具备异质性,发表偏倚检验未见异常。结论:摄入咖啡因可显著改善运动员跳跃能力,剂量选择在4~6mg/kg体重范围内最可能增强足球、橄榄球、排球运动员跳跃表现,对其他运动项目组内的运动员有潜在改善效果。
文摘This paper deals with the H∞ control problems of Markovian jump systems with mode-dependent time delays. First, considering the mode-dependent time delays, a different delay-dependent H∞ performance condition for Markovian jump systems is proposed by constructing an improved Lyapunov-Krasovskii function. Based on this new H∞ disturbance attenuation criterion, a full-order dynamic output feedback controller that ensures the exponential mean-square stability and a prescribed H∞ performance level for the resulting closed-loop system is designed. Illustrative numerical examples are provided to demonstrate the effectiveness of the proposed approach.
文摘This paper studies the nonstationary filtering problem of Markov jump system under <span style="white-space:nowrap;"><i>l</i><sub>2</sub> - <i>l</i><sub>∞</sub> </span>performance. Due to the difference in propagation channels, signal strength and phase will inevitably change randomly and cause the waste of signals resources. In response to this problem, a channel fading model with multiplicative noise is introduced. And then a nonstationary filter, which receives signals more efficiently is designed. Meanwhile Lyapunov function is constructed for error analysis. Finally, the gain matrix for filtering is obtained by solving the matrix inequality, and the results showed that the nonstationary filter converges to the stable point more quickly than the traditional asynchronous filter, the stability of the designed filter is verified.
文摘目的:系统总结不同运动干预诱导激活后表现增强(PAPE)的相关研究,为制定适宜的PAPE诱导方案提供参考与启示。方法:检索Web of Science、PubMed、EBSCO、CNKI等数据库的相关文献,通过筛选后共纳入71篇。结果:涉及的运动干预包括深蹲、奥林匹克举、臀推、硬拉、腿推举、飞轮抗阻训练、超等长跳跃、阻力冲刺跑、全身振动训练、可变阻力训练、聚组训练、血流限制训练12种。结论:以冲刺PAPE为诱导目标时,适宜采用臀推、阻力冲刺跑、高翻以及超等长跳跃;以跳跃PAPE为诱导目标时,适宜采用自由重量深蹲、等长深蹲、分腿蹲结合血流限制训练以及跳深和负重蹲跳;力量水平高的运动员适宜采用全幅度运动方式以及等长深蹲;力量水平低的运动员适宜采用半幅度运动方式、固定器械腿推举以及全身振动训练;适宜将可变阻力训练和聚组训练与传统抗阻训练相结合应用于复合式训练中;飞轮抗阻训练和血流限制训练无需大重量器械即能对机体有较大的刺激效果,可用于赛前激活方案中。
文摘目的:探究等速运动不同速度、模式下花样跳绳运动对女大学生膝关节屈、伸肌肌力、动态平衡的影响。方法:选取遵义医科大学女大学生30名,随机分为实验组和对照组各15人,两组均参与相同体育课活动,另对实验组进行12周跳绳干预。运用Iso Med 2000等速测试系统在干预前后采集受试者角速度为60°/s、200°/s条件向心、离心模式下膝关节屈、伸肌峰值力矩(Peak Torque、PT)及屈、伸肌群峰值力矩比值(hamstring/quadriceps、H/Q)数据;运用YBT平衡测试系统采集双下肢前侧、后内侧和后外侧3个方向最大达到距离及最大达到距离标准化数据,数据处理组内采用配对样本T检验,组间采用独立样本T检验。结果:等速测试中,实验组在60°/s、200°/s条件,向心、离心模式下膝关节屈、伸肌PT值对比均明显大于干预前(P<0.05);实验组、对照组60°/s离心屈肌间、离心模式下伸肌间PT值对比均存在显著差异(P<0.05)。60°/s条件下Hc/Qe值及200°/s条件下He/Qc值对比均存在显著差异(P<0.05)。YBT测试中,实验组双下肢前侧、后内侧、后外侧最大到达距离显著高于干预前(P<0.05),其中双下肢后外侧相较与干预前测试产生非常明显变化(P<0.01);双下肢前侧、后内侧、后外侧YBT标准化结果与对照组相比变化显著(P<0.05),干预后左后外侧、右后内侧、右后外侧实验组YBT标准化结果明显大于对照组(P<0.01)。结论:(1)12周跳绳训练可有效提升女大学生膝关节屈、伸肌肌力。(2)跳绳运动可以改善女大学生的动态平衡能力及运动表现能力。
基金supported by Natural Science Basic Research Program of Shaanxi(Grant No.2023-JC-JQ-05)National Natural Science Foundation of China(Grant No.11971368)+1 种基金supported by the Fundamental Research Funds for the Central Universities(Grant No.WK3470000024)supported by The Hong Kong Polytechnic University(Grant Nos.P0031417 and P0039251)。
文摘In this paper,we study the n-player game and the mean field game under the constant relative risk aversion relative performance on terminal wealth,in which the interaction occurs by peer competition.In the model with n agents,the price dynamics of underlying risky assets depend on a common noise and contagious jump risk modeled by a multi-dimensional nonlinear Hawkes process.With a continuum of agents,we formulate the mean field game problem and characterize a deterministic mean field equilibrium in an analytical form under some conditions,allowing us to investigate some impacts of model parameters in the limiting model and discuss some financial implications.Moreover,based on the mean field equilibrium,we construct an approximate Nash equilibrium for the n-player game when n is sufficiently large.The explicit order of the approximation error is also derived.