BOUNDARY VALUE PROBLEMS FOR A CLASS OF QUASILINEAR DIFFERENTIAL SYSTEMS WITH SINGULAR NONLINEARITIES

In this paper the existence and multiplicities of positive solutions for a class of quasiliear differential systems with singular nonlinearities via Leray-Schaudet degree theory are established.     

MULTIPLE POSITIVE SOLUTIONS OF A CLASS OF THREE-POINT SINGULAR NONLINEAR BOUNDARY VALUE PROBLEMS

In this paper, the existence theorem for three positive solutions is presented for the singular nonlinear boundary value problem by applying the extended Five Functionals fixed point theorem. singular nonlinear boundary value problem; positive solutions; cone; fixed point theorem     

SINGULAR PERTURBATION ON STABILITY FOR A CLASS OF NONLINEAR CONTROL SYSTEMS

1IntroductionStabilitypropertiesofSingularlyperturbedsystemshavebeenstudiedovalthepasttwoorthreede.ade,[1'21.Lyapunovmethodshavebeenwidelyemployed.Themainideaofthispaperistodecompositetheoriginalsystemstotwoseparatesllbsysterns:theso--calledreducedandboun…     

ASYMPTOTIC ESTIMATION FOR SOLUTION OF A CLASS OF SEMI-LINEAR ROBIN PROBLEMS

A class of semi-linear Robin problem is considered. Under appropriate assumptions, the existence and asymptotic behavior of its solution are studied more carefully. Using stretched variables, the formal asymptotic expansion of solution for the problem is constructed and the uniform validity of the solution is obtained by using the method of upper and lower solution.     

POSITIVE PERIODIC SOLUTIONS OF A CLASS OF DISCRETE TIME SYSTEM WITH DELAYS AND A FEEDBACK CONTROL

With the help of a continuation theorem based on Gaines and Mawhin's coincidence degree, sufficient conditions are established for the existence of periodic solutions of a class of discrete differential system with delays and feedback control.     

STOCHASTIC APPROXIMATION UNDER A CLASS OF MEASUREMENT ERRORS

In this paper we shall consider the cases where the zeroes or extreme points of regression function h(x) are not singal, the measurement errors are quite general. When it is known a priori that the zero set or extreme set of h(x) lie in some bounded close set, a truncated Bobbins-Monro (RM) or Kiefer-Wolfowitz (KW) algorithms is suggested, and the strong convergence of the algorithms is proved under simple conditions. For the same mea surement errors to search zero set of linear fuction or extreme set of quadratic function usual RM or KW procedures can guarantee their strong convergence under rather simple conditions.     

ASYMPTOTIC SOLUTION OF SINGULARLY PERTURBED PROBLEM FOR A NONLINEAR SINGULAR EQUATION

The singularly perturbed initial value problem for a nonlinear singular equation is considered. By using a simple and special method the asymptotic behavior of solution is studied.     

A CLASS OF SINGULARLY PERTURBED NONLINEAR BOUNDARY VALUE PROBLEM

The singularly perturbed boundary value problem for the nonlinear boundary conditions is considered. Under suitable conditions,the asymptotic behavior of solution for the original problems is studied by using theory of differential inequalities.     

NONEXISTENCE OF POSITIVE SOLUTION OF A CLASS OF NONLINEAR DIFFERENCE EQUATION

In this paper, a class of nonlinear difference equations are investigated. The sufficient conditions for the nonexistence of positive solutions are obtained. The results in this paper improve ones in [2].     

ON THE SINGULAR VARIATIONAL PROBLEMS

The authors deal with the singular variational problem S(a,b,λ0):=infu∈E,u(≡／)0 ∫RN(||X|-a(△)u|m ∫|x|-(a 1)m|u|m)dx/(∫RN||X|-bU|P dx)m/p as well as (S)=(S)(a,b,λ1,λ2):=u,ν,E∈,u(u,ν)(≡／)(1,1) ∫RN J(u,ν)dx/(∫RN|x|-bp|u|α|ν|βdx)m/p, whereJ(u, v) = ||x|- au|m λ1|x|- (a 1)m|u|m ||x|- av|m λ2|x|- (a 1)m|v|m,N ≥ m 1 ＞ 2, 0 ≤ a ＜ N-m/m, a ≤ b ＜ a 1 and p = p(a,b) = α β =Nm/N-m m(b-a), α, β≥ 1, E = D1,mα(RN). The aim of this paper is to show the existence of minimizer for S(a, b, A0) and S(a, b, λ1, λ2).     

Markov调制的随机系统平稳分布的存在与唯一性(英文)

本文讨论Markov调制的随机系统平稳分布的存在与唯一性. 利用Lyapunov方法与耦合方法得到这类系统存在唯一平稳分布的一些充分条件, 这些条件易于验证具可操作性.     

具有有限燃料的奇异型最佳随机控制问题之推广

本文推广了有限燃料情况下的奇异型随控制模型，对推广后的模型求出了最佳费用函数的结构表达式及最佳控制的存在条件，且当最佳控制存在时具体地构造出了该最佳控制。     

一类具漂移项的奇异型平稳模型

研究了一类对称的奇异型平稳随机控制模型,在原始模型受控状态过程的基础上添加了飘移因子,并将原始模型中的费用函数推广为较一般的费用函数,求得了与此类问题有关的一个变分不等式组的解,并且给出了最佳控制策略.     

THE EXISTENCE AND UNIQUENESS OF SOLUTION FOR A CLASS OF STOCHASTIC FUNCTIONAL EQUAFIONS ON S.P.SPACE

We staxt in discussing a class of more general functional equations in tliis paper, andthe maill ainl is to establish the existence and uniquenes8 of solution of a class of stochasticfunctioual equations on stochastic processes space (called "S.P space" for sllort). The11 usingthe resuIt to son1e specia1 kil1ds ofordillary differential equation, stochastic differential (integral)equation (called "S.D.E." or "S.I.E." fOr short), a series of corollaries l1ave been derived. Someof then1 can b…     

基于一类时变广义系统的产业结构预测及控制模型

本文建立了经济增长与动态产业结构预测模型,并得了动态产业结构协调发展的充要条件,从而利用最优控制方法讨论了产业结构调整问题。     

一类奇异跳跃系统的鲁棒稳定性研究

研究了一类奇异跳跃系统的鲁棒稳定和镇定问题.在所研究的系统中,假设系数和转移率的不确定项范数有界.通过构造Lyapunov-Krasovskii函数,得到的充分条件可以保证系统在一定程度不确定性的影响下,是正则,无脉冲和均值意义下随机稳定的.最后,算例说明了所给方法的有效性.     

带随机过程的随机规划问题最优解过程的平稳性与马氏性

证明了带随机过程的随机规划问题其最优争集中至少存在一列最优解均为可测的随机过程；且如果问题中的随机过程具有平稳性与马氏性，则此时间问题的最优解过程亦具有相应的特性。     

一类It(o)型非线性时滞关联随机大系统的分散鲁棒控制

在非线性项满足全局Lipschitz条件下，本文研究了一类Ito型非线性时滞关联随机大系统的分散鲁棒控制问题．系统的时滞是关于状态和控制输入的．基于Lyapunov泛函及线性矩阵不等式（LMI）的分析方法，得到了无记忆状态反馈控制器使整个时滞关联随机大系统可镇定的充分条件．     

一类奇异半线性反应扩散方程初值问题解的存在性

本文获得了如下的奇异半线性反应扩散方程初值问题{(e)u/(e)t-(1/tσ)△u=up+f(x),t＞0,x∈Rnlim t→0+ u (t,x)=0, x∈Rn广义解(mild solution)在L∞ loe[(0,∞);L∞(Rn)]中的存在性.其中σ＞0,0＜p＜1,f(x)非负且f(x)∈L∞(Rn).