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Observer-Based Controller Design for Singular Stochastic Markov Jump Systems with State Dependent Noise

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Journal of Systems Science & Complexity 2016年第4期29卷 946-958页

作者： ZHAO Yong ZHANG weihai College of Electrical Engineering and Automation and College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

This paper is concerned with the problem of observer-based controller design for singular stochastic Markov jump systems with state-dependent noise. Two concepts called "non-impulsiveness"and "mean square admissibility" are introduced, which are different from previous ones. Sufficient conditions for the open-and closed-loop singular stochastic Markov jump systems with state-dependent noise to be mean square admissible are provided in terms of strict LMIs. The controller gain and the observer gain which guarantee the resulting closed-loop error system to be mean square admissible are obtained in turn by solving the strict LMIs. A numerical example is presented to show the efficiency of the design approach.

关键词： Linear matrix inequalities observer-based controller singular stochastic systems stability.

汇川MD880-50M系列逆变单元结构功能原理及维修维护介绍

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变频器世界 2024年第6期27卷 98-103页

作者：安宏亮日照钢铁有限公司

经过多年技术追赶,国内变频器企业在生产工艺上逐渐完善,产品可靠性稳步提升,国产品牌变频器市场占有量逐渐提高,未来随着国产品牌定制化能力以及产品研发制造实力的提升,国产替代趋势有望延续,汇川品牌变频器市场占有率最高,其可靠的性... 详细信息

经过多年技术追赶,国内变频器企业在生产工艺上逐渐完善,产品可靠性稳步提升,国产品牌变频器市场占有量逐渐提高,未来随着国产品牌定制化能力以及产品研发制造实力的提升,国产替代趋势有望延续,汇川品牌变频器市场占有率最高,其可靠的性能,完善的功能控制,得到市场肯定,其品牌在我单位应用领域也比较广泛。

关键词：逆变单元结构布局功能模块维修维护

Multicriteria optimization problems of finite horizon stochastic cooperative linear-quadratic difference games

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Science China(Information Sciences) 2022年第7期65卷 197-209页

作者： Chenchen PENG weihai ZHANG College of Electrical Engineering and Automation Shandong University of Science and Technology

This paper investigates the Pareto optimality of the regular and the indefinite stochastic cooperative linear-quadratic difference games in a finite time horizon. We derive a general form and a linear property of the solution to the linear stochastic difference system by defining several sequences of bounded and linear operators. The performance criteria's convexity can be guaranteed naturally under the weighted matrices' constraints for the regular cooperative game, and the weighting technique can well characterize the Pareto optimality. We also establish a novel convexity criterion for the cost functionals of the indefinite cooperative game, in which we find that the minimization of the performance criteria's weighted sum is equivalent to the Pareto optimal strategies. To derive all the Pareto optimal strategies and solutions, we present a computing algorithm using the weighted difference Riccati equation and the weighted difference Lyapunov equation for the regular and the indefinite cases. We present a practical example in the economy to validate the results.

关键词： multicriteria optimization problems Pareto optimality cooperative difference games discrete-time stochastic LQ theory the difference Riccati equation the difference Lyapunov equation

On Observability and Detectability of Continuous-Time Stochastic Markov Jump Systems

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Journal of Systems Science & Complexity 2015年第4期28卷 830-847页

作者： TAN Cheng ZHANG weihai School of Control Science and Engineering Shandong University College of Electrical Engineering and Automation Shandong University of Science and Technology

This paper mainly studies observability and detectability for continuous-time stochastic Markov jump *** concepts called W-observability and W-detectability for such systems are introduced,which are shown to coincide with various notions of observability and detectability reported recently in literature,such as exact observability,exact detectability and ***,by introducing an accumulated energy function,some efficient criteria and interesting properties for both W-observability and W-detectability are obtained.

关键词： Continuous-time stochastic system detectability Markov jump observability.

Feedback Stackelberg Solution for Mean-Field Type Stochastic Systems with Multiple Followers

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系统科学与复杂性学报:英文版 2023年第4期36卷 1519-1539页

作者： LIN Yaning ZHANG weihai School of Mathematics and Statistics Shandong University of TechnologyZibo 255000China College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

This paper discusses feedback Stackelberg strategies for the continuous-time mean-field type stochastic systems with multiple followers in infinite ***,optimal control problems of the followers are studied in the sense of Nash *** the help of a set of generalized algebraic Riccati equations(GAREs),sufficient conditions for the solvability are put ***,the leader faces a constrained optimal control problem by transforming the cost functional into a trace *** the Karush-Kuhn-Tucker(KKT)conditions,necessary conditions are presented in term of the solvability of the cross-coupled stochastic algebraic equations(CSAEs).Moreover,feedback Stackelberg strategies are obtained based on the solutions of the *** addition,an iterative scheme is introduced to obtain efficiently the solutions of the ***,an example is given to shed light on the effectiveness of the proposed results.

关键词： Feedback information structure generalized algebraic Riccati equations mean-field type stochastic systems Stackelberg strategy

Feedback image encryption algorithm with compound chaotic stream cipher based on perturbation

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Science China(Information Sciences) 2010年第1期53卷 191-202页

作者： TONG XiaoJun1 & CUI MingGen2.1School of Computer Science and Technology, Harbin Institute of Technology, weihai 2.42.9, China 2.chool of Science, Harbin Institute of Technology, weihai 2.42.9, China 1. School of Computer Science and Technology Harbin Institute of Technology Weihai 264209 China2. School of Science Harbin Institute of Technology Weihai 264209 China

In this paper, two new one-dimensional chaotic functions are designed using Devaney chaotic definition. And a dynamically shifting compound chaotic function is constructed based on the two new one-dimensional chaotic functions. The properties of compound chaotic functions are also proved. A new feedback image encryption algorithm is designed using the new compound chaos and an image pixel permutation, 3D baker scheme is described in detail. In the scheme, a new dynamic block dividing the 3D baker is put forward using the compound chaotic map, and the key space expands. In order to produce avalanche effect and sensitivity of cipher to plaintext, the round times are designed to control the cycle. The entropy analysis, difference analysis, weak-key analysis, statistical analysis, cipher random analysis, and cipher sensibility analysis depending on key and plaintext are introduced to test the security of the new scheme of image encryption. The tests show that the image encryption method passes the random tests of NIST FIPS 140-2.2.01) and SP 800-2. standards. This paper also solves the problem of short periods and low precision of one-dimensional chaotic function by perturbation.

关键词： compound chaos stream cipher feedback image encryption 3D baker perturbation

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基于感兴趣区域的物体抓取位姿检测

系统工程与电子技术 2024年第6期46卷 1867-1877页

作者：孙先涛江汪洋陈文杰陈伟海智亚丽安徽大学电气工程与自动化学院安徽合肥230601 北京航空航天大学自动化科学与电气工程学院北京100191

在工业生产中,待抓取物体往往具有种类众多、摆放位置杂乱、形状不规则等特点,使得难以准确获取物体抓取位姿。针对以上问题,提出一种基于深度学习的两阶段抓取位姿估计方法。第1阶段,提出一种基于YOLOv4(you only look once version4)... 详细信息

在工业生产中,待抓取物体往往具有种类众多、摆放位置杂乱、形状不规则等特点,使得难以准确获取物体抓取位姿。针对以上问题,提出一种基于深度学习的两阶段抓取位姿估计方法。第1阶段,提出一种基于YOLOv4(you only look once version4)改进的轻量级旋转目标检测算法,提高目标的检测速度和检测精度。首先,使用轻量化网络GhostNet和深度可分离卷积对原始网络进行重构,降低整个模型参数。然后,在颈部网络中增加自适应空间特征融合结构和无参注意力模块,提高对感兴趣区域的定位精度;最后,使用近似倾斜交并比(skew intersection over union,SkewIoU)损失解决角度的周期性问题。第2.段,制作与原始图片尺寸一样的掩膜提取感兴趣区域;同时,提出一种改进的DeepLabV3+算法,用以检测感兴趣区域中物体的抓取位姿。实验结果表明,改进后的YOLOv4网络检测精度达到92.5%,改进的DeepLabV3+算法在Cornell抓取数据集上的图像拆分和对象拆分精度分别达到94.6%,92.4%,且能准确检测出物体的抓取位姿。

关键词：深度学习掩膜感兴趣区域轻量化网络位姿检测

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儿童社会分享型提取诱发遗忘的发展特点

心理发展与教育 2024年第2期40卷 153-159页

作者：储月刘希平徐慧唐卫海天津师范大学心理学部天津300387

为了考察社会分享型提取诱发遗忘是否存在于儿童群体中,研究选取了9~12.儿童各30名,以30名大学生作为成人对照,考察了儿童社会分享型提取诱发遗忘的发展特点。实验为5(年龄:9岁、10岁、11岁、12.、2.岁)×3(项目类型:Rp+、Rp-、Nrp)... 详细信息

为了考察社会分享型提取诱发遗忘是否存在于儿童群体中,研究选取了9~12.儿童各30名,以30名大学生作为成人对照,考察了儿童社会分享型提取诱发遗忘的发展特点。实验为5(年龄:9岁、10岁、11岁、12.、2.岁)×3(项目类型:Rp+、Rp-、Nrp)的混合实验设计。结果发现:5个年龄组均产生了社会分享型提取诱发遗忘,并且各年龄儿童社会分享型提取诱发遗忘表现与成人相当。社会分享型提取诱发遗忘在9~12.儿童中稳定存在。

关键词：儿童社会分享型提取诱发遗忘抑制机制

MULTI-DIMENSIONAL REFLECTED BACKWARD STOCHASTIC DIFFERENTIAL EQUATIONS AND THE COMPARISON THEOREM

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Acta Mathematica Scientia 2010年第5期30卷 1819-1836页

作者：吴臻消华 School of Mathematics Shandong University School of Mathematics and Statistics Shandong University at Weihai

In this article, we study the multi-dimensional reflected backward stochastic differential equations. The existence and uniqueness result of the solution for this kind of equation is proved by the fixed point argument where every element of the solution is forced to stay above the given stochastic process, i.e., multi-dimensional obstacle, respectively. We also give a kind of multi-dimensional comparison theorem for the reflected BSDE and then use it as the tool to prove an existence result for the multi-dimensional reflected BSDE where the coefficient is continuous and has linear growth.

关键词： backward stochastic differential equations comparison theorem local time