An Exact Solution Method for Reliability Optimization in Complex Systems

Systems reliability plays an important role in systems design, operation and management. Systems reliability can be improved by adding redundant components or increasing the reliability levels of subsystems. Determination of the optimal amount of redundancy and reliability levels among various subsystems under limited resource constraints leads to a mixed-integer nonlinear programming problem. The continuous relaxation of this problem in a complex system is a nonconvex nonseparable optimization problem with certain monotone properties. In this paper, we propose a convexification method to solve this class of continuous relaxation problems. Combined with a branch-and-bound method, our solution scheme provides an efficient way to find an exact optimal solution to integer reliability optimization in complex systems. This research was partially supported by the Research Grants Council of Hong Kong, grants CUHK4056/98E, CUHK4214/01E and 2050252, and the National Natural Science Foundation of China under Grants 79970107 and 10271073.  

关于集值非线性混合变分不等式问题

本文研究一类广义集值非线性混合变分不等式问题,建立了其解的存在性定理．我们的工作是zhang工作的修正．我们的结果是Cho etc．和Verma的相应结果的改进和发展．  

广义Φ-伪压缩类映射的不动点收敛定理

研究了一致连续广义Φ-伪压缩映射的不动点收敛定理.该定理中不要求Φ(t)为严格递增函数且对实序列的条件做了相应地放宽,从而所得结果推广和改进了已知的结论.  

带有交错扩散的Leslie-Gower型三种群系统的稳态模式

讨论了带有Neumann边界条件的一类Leslie-Gower型三种群系统,在一定的条件之下,虽然系统对应的扩散(没有交错扩散)系统的唯一正平衡解是稳定的,系统中的交错扩散可导致Turing不稳定性的产生.特别地,建立了该系统非常数共存解的存在性.结果表明,交错扩散可引起系统中出现非常数正稳态解(稳态模式).  

Clifford分析中κ-双正则函数的一些性质(英文)

k-双正则函数是双正则函数的推广。尽管许多k-双正则函数不是双正则函数,双正则函数的许多性质可以推广到k-双正则函数。本文研究了k-双正则函数的一些性质,包括Cauchy-Pompeiu公式,高阶Cauchy积分公式,平均值定理和级数的收敛定理。  

Clifford分析中k-正则函数的一些性质和高阶Cauchy型积分的边值特性

本文首先给出了定义于R~n取值于Clifford代数C(V_(n,0))中k-正则函数的若干性质,如唯一性定理,Cauchy-Pompeiu公式,高阶Cauchy积分公式,平均值定理等,然后在k-正则函数的高阶Cauchy积分公式的基础上,相应的定义了r次连续可微函数的高阶Cauchy型积分,并给出了它的Cauchy主值,Plemelj公式,边值的Ho|¨lder连续性及其Privalov定理.  

Research on factors influencing the mechanical properties of metallic rubber

Starting from the theory of cellular solids, the nonlinear theory of dry friction, and the model of a bent slender beam, a nonlinear constitutive equation for a metallic rubber is constructed. The effect of density and shape factor on the mechanical properties of the metallic rubber is studied in the cases where varies only one of the parameters or both vary simultaneously. Static experiments were carried out in every case, and based on the results found, relations between the parameters and the corresponding nonlinear constitutive equation are constructed. If the density and shape factor of a metallic rubber are known, the coefficients of the equation can be obtained, and thus the constitutive equation itself of the rubber can be predicted.