On allocating one active redundancy to coherent systems with dependent and heterogeneous components' lifetimes
研究了在元件寿命异质且统计相关的相干系统中，如何分配一个主动冗余以延长系统寿命，给出了使系统寿命随机更长的充要条件，并针对可交换和随机递增的元件寿命情形给出了具体分配策略。
This article studies coherent systems of heterogenous and statistically dependent components' lifetimes. We present a sufficient and necessary condition for a stochastically longer system lifetime resulted by allocating a single active redundancy. For exchangeable components' lifetimes, allocating the redundancy to the component with more minimal path sets is proved to produce a more reliable system, and for systems with stochastic arrangement increasing components' lifetimes and symmetric structure with respect to two components, allocating the redundancy to the weaker one brings forth a larger reliability. Several numerical examples are presented to illustrate the theoretical results as well. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 335–345, 2016