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121.
滕志东 《应用数学和力学(英文版)》1999,20(12):1405-1412
Considerthefollowingnonlinearcontrolsystem:·x=Ax+B(σ),σ=CTx,(1)wherex=(x1,x2,…,xn)T∈Rn,thenoteTexpressesthetransposeofmatrixandvector,A,BandCaren×n,n×mandn×mconstantmatricesrespectively,σ=(σ1,σ2,…,σm)T∈Rmand(σ)=(1(σ1),2(σ2),…,m(σm))T:Rm→Rmiscont… 相似文献
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The problem of optimality and performance evaluation for cluster analysis procedures is investigated. For the situations where the classes are described by known or unknown prior probabilities and regular probability density functions with unknown parameters the asymptotic expansions of classification error probability are constructed. The results are illustrated for the case of well‐known Fisher classification model. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
124.
非平稳NA序列中心极限定理的一些结果 总被引:8,自引:0,他引:8
本文讨论了非平稳同分布NA序列的渐近正态问题,给出了两个中心极限定理,以往的文献在讨论NA序列的这些问题时,多加有强平稳的限制;但是大量问题所出现的NA序列却多为非平稳的,因此有开展研究的必要。本文在寻求摆脱平稳性限制的途径方面作了有益的尝试,所得的定理不仅可解决一大类非平稳NA序列的渐近正态问题,而且将以往的强平稳场合的结果包含为特例,具有一定的理论意义与应用价值。 相似文献
125.
程昌钧 《应用数学和力学(英文版)》1981,2(5):529-537
In this paper, according to the simplified theory of [1], the bending of rectangular plates with two opposite edges simply supported and other two opposite edges being arbitrary under the action of a concentrated load is treated by means of properties of two-variable-function and the method of series[2]. The effect of transverse shearing forces on the bending of plates is considered. When the thickness h of plates is small, and the term, whose orders are more than order of h2 are neglected, then the results agree with the solutions corresponding to the problem of thin plates[3]. At the end, the solutions of the bending problem of plates with arbitrary linear distributed load are also obtained. 相似文献
126.
A perturbation-variational solution of the large deflection of rectangular plates under uniform load
In this paper, von Karman’s set of nonlinear equation for large deflection of rectangular plates is at first converted into several sets of linear equations by taking central dimensionless deflection as perturbation parameter, and then, the sets of linear equations for plates with various ratio λ of length to width are solved with application of variational method. The analytical expressions for displacements and stresses as well as formulas for numerical calculation are worked out. The figures of maximum deflection-load end maximum stress with ratio H of length to width as a parameter are given in this paper. Through comparison, it is found that the results of this paper are quite in accord with experiments. 相似文献
127.
研究在经常作用干扰下的稳定性是研究李雅普诺夫意义下稳定性的深入和发展,并且更有实际意义,因为干扰往往并不是一次的.关于经常作用干扰下的稳定性,马尔金提出了一个一般定理;但实用它必须找出满足一定条件的李雅普诺夫函数.这对于非线性非定常系统是很困难的.本文根据李雅普诺夫间接法的原理,将之推广应用到判别非线性非定常系统在经常作用干扰下的稳定性,证明了一个重要结论. 相似文献
128.
Dynamics of virus infection models with density‐dependent diffusion and Beddington–DeAngelis functional response
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Shaoli Wang Jiafang Zhang Fei Xu Xinyu Song 《Mathematical Methods in the Applied Sciences》2017,40(15):5593-5612
In this work, we integrate both density‐dependent diffusion process and Beddington–DeAngelis functional response into virus infection models to consider their combined effects on viral infection and its control. We perform global analysis by constructing Lyapunov functions and prove that the system is well posed. We investigated the viral dynamics for scenarios of single‐strain and multi‐strain viruses and find that, for the multi‐strain model, if the basic reproduction number for all viral strains is greater than 1, then each strain persists in the host. Our investigation indicates that treating a patient using only a single type of therapy may cause competitive exclusion, which is disadvantageous to the patient's health. For patients infected with several viral strains, the combination of several therapies is a better choice. Copyright © 2017 John Wiley & Sons, Ltd. 相似文献
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In this paper the stability of nonlinear nonautonomous systems under the frequently-acting perturbation is studied. This study is a forward development of the study of the stability in the Liapunov sense; furthermore, it is of significance in practice since perturbations are often not single in the time domain. Malkin proved a general theorem about thesubject. To apply the theorem, however, the user has to construct a Liapunov function which satisfies specified conditions and it is difficult to find such a function for nonlinear nonautonomous systems. In the light of the principle of Liapunov’s indirect method, which is an effective method to decide the stability of nonlinear systems in the Liapunov sense, the authors have achieved several important conclusions expressed in the form of theorems to determine the stability of nonlinear nonautonomous systems under the frequently-acting perturbation. 相似文献