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H∞ Control of Switched Systems with Time-Delay

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H∞ Control of Switched Systems with Time-Delay

An Improved parallel thinning algorithm with two subiter-ations

第二十七届中国控制会议

作者： Wang Yijing1,Yao Zhenxian1,Zuo Zhiqiang1,Zhao Huimin2,Zhang Guoshan1 1.school of Electrical Engineering & Automation,tianjin university,tianjin 300072,P.R.china 2.General Courses Department,Academy of Military Transportation,tianjin 300161,P.R.china

For switched system composed of linear subsystems with time-delay,the problem of H∞ control is *** on quadratic Lyapunov function technology,a delay-independent condition for the problem of optimization of H∞ performance to be solvable is derived by using Lyapunov-Razumikhin functional ***,a switching state feedback strategy is proposed to solve the H∞ control problem for linear delayed switched *** state feedback,we mean that the switchings among subsystems are dependent on system ***,a simulation example is given to illustrate the validity of the result.

关键词： Switched systems H∞ Control Lyapunov-Razumikhin function Switching rule

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Optoelectronics Letters 2008年第1期4卷 69-71页

作者： ZHANG Fen,WANG Yun-shan,GAO Cheng-yong, SI Shu-chun, and XU Jian-qiang school of Physics and Microelectronics, Shandong university, Jinan 250061, china school of Physics and Microelectronics Shandong University Jinan China

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectively with single pixel width and the processing speed is high.

关键词：图像信号处理图像稀释平行稀释算法子迭代

Study on ChemFET NO2 Gas Sensor Array

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稀有金属材料与工程 2006年第S3期 104-105页

作者： Guangzhong Xie~1 Junsheng Yu~1 Huilin Tai~1 Wusheng Suo~1 Yadong Jiang~1 Bangchao Yang~2 (1.school of Optoelectronic Information,university of Electronic Science & Technology of china,Chengdu 610054,china) (2.school of Microelectronics and Solid-State Electronics,university of Electronic Science & Technology of china,Chengdu 610054,china)

Based on conventional metal-oxide-semiconductor field-effect transistor （MOSFET）,a novel kind of chemical field-effect transistor （ChemFET） gas sensor array has been designed and *** obtained sensor consists of self-assembly polyaniline （PAN） composite film containing poly（acrylic acid）（PAA） which was used as gate material of MOSFET instead of conventional metallic *** UV-Vis absorption spectra of PAN/PAA films were *** NO2gas sensitive property of the ChemFET sensor array was also *** show that the drain current of devices increases with increasing of back-side voltage,and decreases with the increase of NO2concentration when the NO2concentration is below 20μg/*** temperature dependence of ChemFET sensor array shows that the drain current of ChemFET sensor decreases with increasing of temperature.

关键词： NO2 sensitivity ChemFET sensor self-assembly polyaniline poly (acrylic acid)

Effects of chitosan/collagen substrates on the behavior of rat neural stem cells

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Science china(Life sciences) 2010年第2期53卷 215-222页

作者： YANG ZhaoYang1,MO LinHong2,DUAN HongMei2 & Li XiaoGuang1,2 1 school of Biological Science and Medical Engineering,Beihang university,Beijing 100191,china 2 Beijing Institute for Neuroscience,Capital Medical university,Beijing 100069,china 1. school of Biological Science and Medical Engineering Beihang University Beijing 100191 China2. Beijing Institute for Neuroscience Capital Medical University Beijing 100069 China

Spinal cord and brain injuries usually lead to cavity *** transplantation by combining stem cells and tissue engineering scaffolds has the potential to fill the cavities and replace the lost neural *** chitosan and collagen have their unique *** this study,the effects of chitosan and collagen on the behavior of rat neural stem cells (at the neurosphere level) were tested in vitro in terms of cytotoxicity and supporting ability for stem cell survival,proliferation and *** the serum-free condition,both chitosan membranes and collagen gels had low cytotoxicity to *** is,cells migrated from neurospheres,and processes extended out from these neurospheres and the differentiated *** with the above two materials,chitosan-collagen membranes were more suitable for the co-culture with rat neural stem cells,because,except for low cytotoxicity and supporting ability for the cell survival,in this group,a large number of cells were observed to migrate out from neurospheres,and the differentiating percentage from neurospheres into neurons was significantly *** modification of chitosan-collagen membranes may shed light on in vivo nerve regeneration by transplanting neural stem cells.

关键词： chitosan collagen neural stem cells biocompatibility differentiation

Correlations between recombination rate and intron distributions along chromosomes of ***

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Progress in Natural Science:Materials International 2009年第4期19卷 517-522页

作者： Hong Li a,b, Guoqing Liu a, Xuhua Xia b a school of Physical Science and Technology, Inner Mongolia university, Hohhot 010021, china b Department of Biology, university of Ottawa, Ottawa, Ont., Canada K1N 6N5 [a]school of Physical Science and Technology Inner Mongolia University Hohhot 010021 China [b]Department of Biology University of Ottawa Ottawa Ont. Canada K1N 6N5

Generally speaking, the intron size positively correlates with recombination rate in Caenorhabditis elegans genome. Here, we analyze the correlations between recombination rate and some measures of different intron lengths so as to know whether the recombination influences the introns of different lengths in the same way. Results show that the correlation between the recombination rate and the percentage of short introns (<100 bp) is negative, but the correlation between the recombination rate and the percentage of introns that are larger than 500 bp is positive. Average intron length correlates positively with the recombination rate for introns whose length is in the range of 100-1000 bp. We speculate that the recombination mainly exerts impact on introns whose length ranges from 100-1000 bp. We also show that the average intron number per gene correlates negatively with the recombination rate.

关键词： Recombination rate Percentage of introns Intron length Intron number per gene C. elegans

CHAOTIC ATTRACTORS OF THE CONJUGATE CHEN SYSTEM

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CHAOTIC ATTRACTORS OF THE CONJUGATE CHEN SYSTEM

The Second International Conference on Dynamics Vibration and Control

作者： Qigui Yang Guanrong Chen and Kuifei Huang school of Mathematical sciences South china university of Technology Guangzhou 510640 china Department of Electronic Engineering City university of Hong Kong Kowloon Hong Kong SAR china school of Mathematical sciences Guangxi Normal university Guilin 541004 china

＜正＞In this paper, we introduce a new chaotic system of three-dimensional quadratic autonomous ordinary differential equations, the new system is discussed based on Silnikov criterion. Despite its seeming form looks like Chen system, the feature of system is very different from Chen system. Some basic dynamical properties such as Lyapunov exponents, bifurcations, routes to chaos, periodic windows,

关键词： chaos conjugate chen system bifurcation lyapunov exponent

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智能静平衡测试分选仪的稳定性

天津大学学报 1998年第2期31卷 244-248页

作者：李惠敏郝久玉张连洪天津大学电子信息工程学院天津大学机械工程学院

分析了文献［１］所介绍的智能静平衡测试分选仪的稳定性，采用软件维护法和平均值法进行了改进．

关键词：静平衡测试分选仪智能稳定性

Antitumor effect of cytosine deaminase/5-fluorocytosine suicide gene therapy system mediated by Bifidobacterium infantis on melanoma

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Acta Pharmacologica Sinica 2005年第5期26卷 629-634页

作者： Cheng YI~2,Ying HUANG~3,Zhi-ying GUO~3,Shu-ren WANG~(3,4) ~2Cancer Center,West china Hospital,Sichuan university Chengdu,610041,china ~3Department of Pathophysiology,West china school of Preclinical and Forensic Medicine,Sichuan university,Chengdu 610041,china CancerCenter WestChinaHospitalSichuanUniversityChengdu610041China

Aim:To construct a Bifidobacterium infantis/CD targeting gene therapy systemand observe the antitumor effect of cytosine deaminase/5-fluorocytosine(CD/5-FC)suicide gene therapy system mediated by Bifidobacterium infantis on mela-noma in vitro and in ***:A recombinant CD/pGEX-1LamdaT plasmidwas transfected into Bifidobacterium infantis by ***-terium infantis transfected by recombinant CD/pGEX-1LamdaT plasmid was in-cubated with 5-FC *** the supernatant fluid was collected andadded to melanoma B 16-F10 cells to observe the killing effect for B 16-F10 *** were inoculated with melanoma B 16-F10 cells to establish animal *** mice were then injected with 5-FC and Bifidobacterium infantis transfectedby recombinant CD/pGEX-1LamdaT ***:Two segments of approxi-mate 4.9 kb and 1.3 kb were extracted from the 6.2 kb recombinant plasmid,whichwere equal to the size of the pGEX-1LamdaT plasmid and CD gene,*** results showed that the full length and sequence of nucleotide acid ofthe inserted gene in extracted recombinant plasmid was completely identical to theCD *** vitro,B16-F10 cells treated by supernatant fluid were remarkablydamaged morphologically,and the cell growth was significantly ***-ments on the mice melanoma model showed that after treatment with a combina-tion of transfected Bifidobacterium infantis and 5-FC,the tumor volume wassignificantly inhibited compared with ***:The foreign gene,CD gene,was correctly inserted into pGEX-1LambdaT plasmid and transferredinto Bifidobacterium ***/5-FC suicide gene therapy system mediated byBifidobacterium infantis demonstrated a good antitumor effect on melanoma invitro and in vivo.

关键词： Bifidobacterium infantis cytosine deaminase gene therapy

Research on the expanding deformation of ring radius in cold profiled ring rolling process

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Science china(Technological sciences) 2010年第3期53卷 813-821页

作者： YANG He,LI LanYun,WANG Min&GUO LiangGang State Key Laboratory of Solidification Processing,school of Material Science and Engineering,Northwestern Polytechnical university,Xi’an 710072,china 1. State Key Laboratory of Solidification Processing School of Material Science and Engineering Northwestern Polytechnical University Xi’an 710072 China

Cold profiled ring rolling is an advanced local plastic deformation technology widely used to precisely manufacture various complex seamless ring *** plays an important role in many industrial fields such as aeronautics,astronautics,automobile,bearings,*** the cold ring rolling process,the ring radius expands gradually with the increase of the feeding amount(*** reduction),and the expanding deformation of the ring radius is closely related to the rolling *** is very important to investigate the expanding deformation of ring radius for the precise control of ring dimensions and the design of feeding *** this paper,the relation between the expanding deformation of the ring radius and the rolling reduction in the stepped ring rolling process,a typical profiled ring rolling process,is analyzed by using analytical *** results show that the growth amount of the filling depth of groove can't exceed the rolling reduction,that in the inner stepped ring rolling process,the curves of the outer radius and big inner radius with the rolling reduction are monotonous,ascending and concave,i.e.,the outer radius and big inner radius expand faster and faster with the increase of the rolling reduction,and that in the outer stepped ring rolling process,the curves of the inner radius and small outer radius with the rolling reduction are also monotonous,ascending and concave,i.e.,the inner radius and small outer radius expand faster and faster with the increase of the roll reduction.

关键词： cold ring rolling inner stepped ring outer stepped ring rolling reduction expanding deformation of ring radius