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Stability in terms of two measures for impulsive stochastic functional differential systems with infinite delays

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Stability in terms of two measures for impulsive stochastic ...

第三十一届中国控制会议

作者： fengqi yao~1 feiqi deng~2 Hao Shen~1 1.School of Electrical engineering & Information Anhui university of technology Ma’anshan 243032 P.R.china 2.institute of system engineering south china university of technology guangzhou 510640 P.R.china

＜正＞This paper investigates the stability properties of impulsive stochastic functional differential systems with infinite *** employing piecewise continuous Lyapunov functions and the Razumikhin techniques,several criteria on uniform stability and uniformly asymptotical stability in terms of two measures for the mentioned systems are *** example is also worked out to illustrate our results.

关键词： Stochastic functional differential systems Impulsive differential systems Infinite delays Uniformly asymptotical stability Razumikhin technique

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自适应分层免疫算法

计算机工程与应用 2004年第24期40卷 4-6,34页

作者：杨海东邓飞其严小珂姚靠华华南理工大学自动化科学与工程学院广州510640 湖南大学会计学院长沙410000

免疫算法是一种新型的导向性随机启发式搜索算法,文章在简单介绍免疫算法基本原理及操作步骤的基础上,针对几个关键参数和操作算子对算法性能的影响进行探讨。提出根据具体的问题,结合各种形式免疫算法,建立一个自适应分层免疫算法。实... 详细信息

免疫算法是一种新型的导向性随机启发式搜索算法,文章在简单介绍免疫算法基本原理及操作步骤的基础上,针对几个关键参数和操作算子对算法性能的影响进行探讨。提出根据具体的问题,结合各种形式免疫算法,建立一个自适应分层免疫算法。实验表明:自适应分层免疫算法能结合各底层免疫算法的优点,具有收敛速度快、寻解能力强等优点。

关键词：免疫系统免疫算法分层免疫算法

STATIONARY OSCILLATIONS OF SECOND ORDER PERIODIC systemS UNDER STOCHASTIC NOISE INTERFERENCE

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Annals of Differential Equations 1996年第3期12卷 280-284页

作者： deng feiqi(Northeast institute of Heavy Machinery 161042)Feng Zhaoshu Liu Yongqing(south china university of technology510641) Northeast institute of Heavy Machinery 161042 sl.ap-hop-paris.fr

In this paper,the existence of stationary oscillations of second order periodic systemsunder stochastlc noise interference is investigated,and the necessary and sufficient condition for the existence of stationary oscillations in the sense of mean-square stability is obtained via establishing equivalent vector stochastic systems and establishing deterministicequivalent systems in the sense of stability, and applying the existence theorem of stationary oscillations for the deterministic systems.

关键词： Second order system,Stochastic noise,Mean-square stability Equivalence,Stationary oscillation.

Solution of the HJI equations for nonlinear H_∞ control design by state-dependent Riccati equations approach

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Journal of systems engineering and Electronics 2011年第4期22卷 654-660页

作者： Xueyan Zhao feiqi deng institute of systems engineering South China University of Technology Guangzhou 510640 E R. China

The relationship between the technique by state- dependent Riccati equations （SDRE） and Hamilton-Jacobi-lsaacs （HJI） equations for nonlinear H∞ control design is investigated. By establishing the Lyapunov matrix equations for partial derivates of the solution of the SDREs and introducing symmetry measure for some related matrices, a method is proposed for examining whether the SDRE method admits a global optimal control equiva- lent to that solved by the HJI equation method. Two examples with simulation are given to illustrate the method is effective.

关键词： nonlinear system robust control Hamilton-Jacobi-Isaacs (HJI) equation state-dependent Riccati equation (SDRE),global stabilization optimal control.

Stability of stochastic switched epidemic systems with discrete or distributed time delay

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Journal of systems engineering and Electronics 2014年第4期25卷 660-670页

作者： Xiaoying Meng feiqi deng institute of systems engineering South China University of Technology School of Statistics and Mathematics Zhongnan University of Economics and Law

Stochastic switched epidemic systems with a discrete or distributed time delay are constructed and investigated. By the Lyapunov method and lto＇s differential rule, the existence and uniqueness of global positive solution of each system is proved. And stability conditions of the disease-free equilibrium of the systems are obtained. Numerical simulations are presented to illustrate the results.

关键词： stochastic switched epidemic system discrete timedelay distributed time delay stochastically stable Lyapunov functional.

Delay-dependent dissipative filtering for nonlinear stochastic singular systems with time-varying delays

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Science china(Information Sciences) 2017年第12期60卷 93-110页

作者： Shuangyun XING feiqi deng systems engineering institute South China University of Technology College of Science Shenyang Jianzhu University

This paper concentrates on studying the delay-dependent dissipative filtering problem for nonlinear stochastic singular systems with time-varying delays via a Takagi-Sugeno(T-S) fuzzy control approach. The T-S fuzzy model is employed to represent a nonlinear stochastic singular system with unknown or partially unknown membership functions. Firstly, based on an auxiliary vector function, by utilizing an integral inequality and the free-weighting-matrix approach, a delay-dependent sufficient condition is derived to enable the considered filtering error system with time-varying delays to be stochastically admissible and dissipative. Furthermore,on the basis of the derived condition, by using a new type of candidate Lyapunov-Krasovskii function, the solvability conditions of the dissipative filter are addressed, and the corresponding fuzzy filter parameters can be obtained by solving a set of linear matrix inequalities. And then, we deduce the solving method for the H∞filter. The delay-dependent sufficient conditions are proposed to guarantee the systems to be regular, impulsefree, stochastically stable and to achieve a prescribed performance index ?γ. Finally, some simulation examples are proposed to manifest the effectiveness and merits of the filter design methodology developed in the paper.

关键词： nonlinear stochastic singular systems dissipative filtering unknown membership functions stochastic admissibility time-varying delays

Delay-dependent exponential stability of impulsive stochastic systems with time-varying delay

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Journal of systems engineering and Electronics 2011年第5期22卷 799-809页

作者： Pei Cheng feiqi deng Yunjian Peng systems engineering institute South China University of Technology Guangzhou 510640 P. R. China School of Mathematical Science Anhui University Hefei 230039 P. R. China

The problem of delay-dependent exponential stability is investigated for impulsive stochastic systems with time-varying delay. Although the exponential stability of impulsive stochastic delay systems has been discussed by several authors, few works have been done on delay-dependent exponential stability of impulsive stochastic delay systems. Firstly, the Lyapunov-Krasovskii functional method combing the free-weighting matrix approach is applied to investigate this problem. Some delay-dependent mean square exponential stability criteria are derived in terms of linear matrix inequalities. In particular, the estimate of the exponential convergence rate is also provided, which depends on system parameters and impulsive effects. The obtained results show that the system will stable if the impulses＇ frequency and amplitude are suitably related to the increase or decrease of the continuous flows, and impulses may be used as controllers to stabilize the underlying stochastic system. Numerical examples are given to show the effectiveness of the results.

关键词： impulsive stochastic systems time-varying delay exponential stability linear matrix inequality (LMI).

Intergeneric chromosome-specific painting reveals differential chromosomal transmission from Tripidium arundinaceum in sugarcane progeny

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Journal of Integrative Agriculture 2024年第11期23卷 3751-3762页

作者： Fan Yu Zehuai Yu Jin Chai Xikai Yu Chen Fu Xinwang Zhao Hailong Chang Jiawei Lei Baoshan Chen Wei yao Muqing Zhang Jiayun Wu Qinnan Wang Zuhu deng State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources/Guangxi Key Laboratory for Sugarcane Biology College of Agriculture Guangxi University National engineering Research Center for Sugarcane Fujian Agriculture and Forestry University institute of Nanfan & Seed Industry Guangdong Academy of Sciences Key Laboratory of Sugarcane Biology and Genetic Breeding Ministry of Agriculture and Rural Affairs/Fujian Agriculture and Forestry University

Sugarcane has recently attracted increasing attention for its potential as a source of sugar and bioethanol, so increasing its yield is essential to ensure the sugar security and bioenergy production. Intergeneric hybridization is a highly efficient method to produce new genetic variants of crop plants, particularly those species with high ploidy such as sugarcane(Saccharum spp.). Tripidium arundinaceum exhibits many desirable agronomic traits, and has been widely studied to produce hybrids with improved stress tolerance and other characteristics in sugarcane breeding. However, the genetic relationship between T. arundinaceum and Saccharum species, and the individual T. arundinaceum chromosomal compositions in sugarcane hybrids are still elusive. Here we used whole-genome single-nucleotide polymorphisms(SNPs) to ascertain the phylogenetic relationships between these species and found that T. arundinaceum is more closely related to Saccharum than Sorghum, in contrast to the previous narrow genetic analyses using chloroplast DNA. Additionally, oligonucleotide(oligo)-based chromosome-specific painting derived from Saccharum officinarum was able to distinctly identify the chromosomes of T. arundinaceum. We developed the oligo-genomic in situ hybridization(GISH) system for the first time, to unveil the novel chromosome translocations and the transmission of individual T. arundinaceum chromosomes in sugarcane progeny. Notably,we discovered that the chromosomal transmission of T. arundinaceum exhibited several different inheritance modes,including n, 2n, and over 2n in the BC1 progenies. Such inheritance patterns may have resulted from first division restitution(FDR) or FDR+nondisjunction of a chromosome with the sister chromatids in the second meiosis division/second division restitution(FDR+NSC/SDR) model during meiosis. These results will be of substantial benefit for the further selection of T. arundinaceum chromosomes for sugarcane genetic improvement.

关键词： sugarcane Tripidium arundinaceum chromosome painting Oligo-FISH chromosomal transmission

动力集中动车组动力车前后横向平稳性差异研究

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铁道学报 2024年第7期46卷 23-29页

作者：沈龙江李广邓小星姚远中车株洲电力机车有限公司重载快捷大功率电力机车全国重点实验室湖南株洲412001 中国铁道科学研究院集团有限公司金属及化学研究所北京100081 西南交通大学轨道交通运载系统全国重点实验室四川成都610031

针对动力集中动车组动力车现场运行前、后横向平稳性差异问题,基于动力学仿真分析方法研究其形成机理与影响因素,并提出减缓措施。采用Simpack软件建立某型动力车的动力学模型,对比抗蛇行减振器斜对称与开口向外两种布置方式,分析关键... 详细信息

针对动力集中动车组动力车现场运行前、后横向平稳性差异问题,基于动力学仿真分析方法研究其形成机理与影响因素,并提出减缓措施。采用Simpack软件建立某型动力车的动力学模型,对比抗蛇行减振器斜对称与开口向外两种布置方式,分析关键悬挂参数对车体前端和后端横向平稳性影响,并采用模态分析法研究抗蛇行减振器横向安装角对蛇行模态稳定性和车体横移摇头模态相位差的影响;以线性稳定性和车体前、后端横向平稳性指标为优化目标,对抗蛇行减振器阻尼、等效串联刚度以及横向安装角进行多目标优化,并根据计算结果对优化参数进行Sobol全局敏感性分析。结果表明:抗蛇行减振器采用斜对称布置方式时,车体前端与后端的横向平稳性差异受悬挂参数影响较小,横向安装角对动力车横向稳定性不敏感;采用开口向外布置方式时,抗蛇行减振器适当横向安装角度显著降低甚至消除车体前端和后端横向平稳性差异,且车体横向平稳性和线性稳定性对横向安装角均较为敏感,建议优化横向安装角2°~6°。

关键词：动力车横向平稳性差异模态分析多目标优化敏感性分析