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THE FURTHER RESULT ON GLOBAL PRACTICAL TRACKING FOR HIGH-ORDER UNCERTAIN NONLINEAR SYSTEMS

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Journal of Systems science & Complexity 2012年第2期25卷 227-237页

作者： Xuehua YAN Yungang LIU School of Control science and Engineering Shandong University

This paper extends the unknown control coefficients with lower and upper constant bounds to the ones which may take arbitrarily large and /or small *** the existing methods are no longer applicable and the technical obstacles caused by the extensions are essential,new control design scheme should be exploited to the global practical *** the approaches of Nussbaum-gain and adding a power integrator,the authors successfully propose the design scheme of the adaptive practical tracking controller for the *** is shown that the designed controller guarantees that all the closed-loop system states are bounded and the tracking error becomes prescribed arbitrarily small after a finite time.

关键词： Adaptive control adding a power integrator global practical tracking Nussbaum-gain,uncertain nonlinear systems unknown control directions.

ADAPTIVE PRACTICAL TRACKING CONTROL BY OUTPUT FEEDBACK FOR A CLASS OF NONLINEAR SYSTEMS

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Journal of Systems science & Complexity 2010年第6期23卷 1210-1220页

作者： Fang SHANG Yungang LIU Chenghui ZHANG School of Control science and Engineering Shandong University Jinan 250061 China.

This paper investigates the problem of adaptive practical tracking control by output feedback for a class of nonlinear systems in which the nonlinearities are restricted to be upper bounded by a constant plus a polynomial function of the output multiplied by unmeasured states. To solve the problem, an observer with a dynamic high-gain is first introduced, and then an adaptive output feedback tracking controller is successfully designed using the universal control methodology. It is shown that all the states of the closed-loop system are bounded, and the tracking error can be made arbitrarily small by an appropriate choice of the design parameters after some large enough time. A simulation example is also provided to illustrate the correctness of the theoretical results.

关键词： Adaptive practical tracking dynamic high-gain nonlinear systems output feedback.

Flexible Nanopaper Composed of Wood-Derived Nanofibrillated Cellulose and Graphene Building Blocks

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Journal of Renewable Materials 2021年第3期9卷 451-461页

作者： Qing Li Ming Dai Xueren Qian Tian Liu Zhenbo Liu Yu Liu Ming Chen Wang He Suqing Zeng Yu Meng Chenchen Dai Jing Shen Yingtao Liu Wenshuai Chen Wenbo Liu Ping Lu College of Material science and Engineering Northeast Forestry UniversityHarbin150040China Department of Chemistry and Biochemistry Rowan UniversityGlassboroNJ08028USA

Nanopaper has attracted considerable interest in the fields of films and paper ***,the challenge of integrating the many advantages of nanopaper still ***,we developed a facile strategy to fabricate multifunctional nanocomposite paper(NGCP)composed of wood-derived nanofibrillated cellulose(NFC)and graphene as building *** suspension was consisted of long and entangled NFCs(10–30 nm in width)and their *** NGCP formation,NFC was chemically modified with a silane coupling agent to ensure that it could interact strongly with graphene in *** resulting NGCP samples were flexible and could be bent repeatedly without any structural *** the NGCP samples,the high aspect ratio of NFC made a major contribution to its high mechanical strength,whereas the sheet-like graphene endowed the NGCP with electrical resistance and electrochemical *** mechanical strength of the NGCP samples decreased as their graphene content ***,the electrical resistance and electrochemical activity of the NGCP samples both rose with increasing content of *** NGCPs still kept advantageous mechanical properties even at high temperatures around 300℃ because of the high thermal stability of NFCs and their strong entangled web-like *** view of its sustainable building blocks and multifunctional characteristics,the NGCP developed in this work is promising as low-cost and high-performance nanopaper.

关键词： Nanofibrillated cellulose graphene flexible nanopaper mechanical strength electrical resistance

Solution-Distance-Based Migration Rate Calculating for Biogeography-Based Optimization

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Journal of Donghua University(English Edition) 2016年第5期33卷 699-702页

作者：郭为安汪镭陈明吴启迪 Sino-German College of Applied sciences Tongji University College of Electronics and Informatics Engineering Tongji University

Biogeography-based optimization(BBO),a natureinspired optimization algorithm(NIOA),has exhibited a huge potential in *** BBO,the good solutions have a large probability to share information with poor solutions,while poor solutions have a large probability to accept the information from *** original BBO,calculating for migration rates is based on solutions' *** the ranking,it can be known that which solution is better and which one is *** on the ranking,the migration rates are calculated to help BBO select good features and poor *** differences among results can not be reflected,which will result in an improper migration rate *** new ways are proposed to calculate migration rates,which is helpful for BBO to obtain a suitable assignment of migration rates and furthermore affect algorithms ' *** ranking of solutions is no longer integers,but *** employing the strategies,the ranking can not only reflect the orders of solutions,but also can reflect more details about solutions' distances.A set of benchmarks,which include 14 functions,is employed to compare the proposed approaches with other *** results demonstrate that the proposed approaches are feasible and effective to enhance BBO's performance.

关键词： migration ranking calculating Distance assignment helpful details furthermore accept integers

The Weak Galerkin Method for Elliptic Eigenvalue Problems

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Communications in Computational Physics 2019年第6期26卷 160-191页

作者： Qilong Zhai Hehu Xie Ran Zhang Zhimin Zhang Department of Mathematics Jilin UniversityChangchun 130012China LSEC ICMSECAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190P.R.China School of Mathematical sciences University of Chinese Academy of SciencesBeijing 100049P.R.China Beijing Computational science Research Center Beijing100193China Department of Mathematics Wayne State UniversityDetroitMI 48202USA

This article is devoted to studying the application of the weak Galerkin(WG)finite element method to the elliptic eigenvalue problem with an emphasis on obtaining lower *** WG method uses discontinuous polynomials on polygonal or polyhedral finite element *** non-conforming finite element space of the WG method is the key of the lower bound *** also makes the WG method more robust and flexible in solving eigenvalue *** demonstrate that the WG method can achieve arbitrary high convergence *** is in contrast with existing nonconforming finite element methods which can provide lower bound approximations by linear finite *** results are presented to demonstrate the efficiency and accuracy of the theoretical results.

关键词： Weak Galerkin finite element method elliptic eigenvalue problem lower bounds error estimate

A Comparison Theorem and Uniqueness Theorem of Backward Doubly Stochastic Differential Equations

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Acta Mathematicae Applicatae Sinica 2011年第2期27卷 223-232页

作者： Qian Lin Zhen Wu School of Mathematics Shandong University Jinan 250100 China Laboratoire de Mathematiques CNRS UMR 6205 Universite de Bretagne Occidentale 6 avenue Victor Le Gorgeu CS 93837 29238 Brest cedex 3 France

In this paper, we deal with one dimensional backward doubly stochastic differential equations （BDSDEs）. We obtain a comparison theorem and a uniqueness theorem for BDSDEs with continuous coefficients.

关键词： backward doubly stochastic differential equations comparison theorem backward stochastic integral uniqueness theorem

RANDOM WEIGHTING METHOD FOR CENSORED REGRESSION MODEL

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Journal of Systems science & Complexity 2004年第2期17卷 262-270页

作者： ZHAOLincheng FANGYixin DepartmentofStatisticsandFinance UniversityofScienceandTechnologyofChinaHefei230026China

Rao and Zhao (1992) used random weighting method to derive the approximate distribution of the M-estimator in linear regression *** this paper we extend the result to the censored regression model (or censored “Tobit... 详细信息

关键词： censored regression least absolute deviations estimates random weighting bootstrap

Dynamic Multi-objective Optimization of Chemical Processes Using Modified BareBones MOPSO Algorithm

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Journal of Donghua University(English Edition) 2014年第2期31卷 184-189页

作者：杜文莉王珊珊陈旭钱锋 Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of EducationEast China University of Science and Technology

Dynamic multi-objective optimization is a complex and difficult research topic of process systems engineering. In this paper,a modified multi-objective bare-bones particle swarm optimization( MOBBPSO) algorithm is proposed that takes advantage of a few parameters of bare-bones algorithm. To avoid premature convergence,Gaussian mutation is introduced; and an adaptive sampling distribution strategy is also used to improve the exploratory capability. Moreover, a circular crowded sorting approach is adopted to improve the uniformity of the population ***, by combining the algorithm with control vector parameterization,an approach is proposed to solve the dynamic optimization problems of chemical processes. It is proved that the new algorithm performs better compared with other classic multiobjective optimization algorithms through the results of solving three dynamic optimization problems.

关键词： dynamic multi-objective optimization bare-bones particle swarm optimization(PSO) algorithm chemical process

A novel all-fiber micro-displacement sensor based on long period grating and tip structure

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Optoelectronics Letters 2014年第3期10卷 176-179页

作者：白志勇张伟刚高社成王丽 Key Laboratory of Optical Information science and Technology Ministry of EducationInstitute of Modern OpticsNankai University

A novel high sensitivity all-fiber micro-displacement sensor is proposed and experimentally *** sensor consists of a long period fiber gating and a fiber tip,which is achieved only by a commercial arc discharge fusion splicer,and thus possesses a lower *** wavelength sensitivity of the proposed sensor could be up to 934 pm/μm,which is four times higher than that of the long period fiber grating(LPFG) with an air cavity *** intensity change sensitivity is-1.973 dB/μm.

关键词： Sensors