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121.
Jorge Navarro Francisco J. Samaniego N. Balakrishnan Debasis Bhattacharya 《海军后勤学研究》2008,55(4):313-327
Following a review of the basic ideas in structural reliability, including signature‐based representation and preservation theorems for systems whose components have independent and identically distributed (i.i.d.) lifetimes, extensions that apply to the comparison of coherent systems of different sizes, and stochastic mixtures of them, are obtained. It is then shown that these results may be extended to vectors of exchangeable random lifetimes. In particular, for arbitrary systems of sizes m < n with exchangeable component lifetimes, it is shown that the distribution of an m‐component system's lifetime can be written as a mixture of the distributions of k‐out‐of‐n systems. When the system has n components, the vector of coefficients in this mixture representation is precisely the signature of the system defined in Samaniego, IEEE Trans Reliabil R–34 (1985) 69–72. These mixture representations are then used to obtain new stochastic ordering properties for coherent or mixed systems of different sizes. © 2008 Wiley Periodicals, Inc. Naval Research Logistics, 2008 相似文献
122.
根据kittel型反铁电相变对称性的变化 ,选择轴矢量 R作为序参量是合适的。由Landau理论 ,相变温度附近的自由能F就可以写成 R幂级数展开的形式。令 F R=0 ,可得到关于序参量的方程 ,从而获得相变温度与自由能的关系 相似文献
123.
In this article, we study reliability properties of m‐consecutive‐k‐out‐of‐n: F systems with exchangeable components. We deduce exact formulae and recurrence relations for the signature of the system. Closed form expressions for the survival function and the lifetime distribution as a mixture of the distribution of order statistics are established as well. These representations facilitate the computation of several reliability characteristics of the system for a given exchangeable joint distribution or survival function. Finally, we provide signature‐based stochastic ordering results for the system's lifetime and investigate the IFR preservation property under the formulation of m‐consecutive‐k‐out‐of‐n: F systems. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011 相似文献
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李敏 《中国人民武装警察部队学院学报》2011,(9):42-44
边防武警具有军人和警察的双重属性,因此,其执行命令行为在性质上不同于普通的军事命令,而体现出一定的行政性特征。边防武警执行命令行为的性质定位直接关系到其执行多样化军事任务中各项行为的法律后果,具有重要的理论意义和司法实践意义。 相似文献
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载噪比作为评估导航信号质量的重要指标,直接影响着接收机的捕获、跟踪和电文解调性能。推导了基于国际民航组织二阶阶跃信号畸变模型下导航接收机采用相关、非相关处理时载噪比估计与畸变模型参数之间的解析表达式,并分析了畸变参数对导航接收机载噪比估计误差的影响。理论分析及仿真结果表明:数字畸变参数变化范围下导航信号载噪比变化在10-2量级,增大模拟畸变的振荡频率或者减小衰减频率将会提高载噪比估计值,模拟畸变参数变化引起的载噪比损耗可达0.1d BHz,畸变参数对载噪比估计的影响整体上都较小,因此导航接收机的载噪比输出不能作为监测导航信号是否异常的完备检测量。 相似文献
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We consider two specially structured assemble‐to‐order (ATO) systems—the N‐ and W‐systems—under continuous review, stochastic demand, and nonidentical component replenishment leadtimes. Using a hybrid approach that combines sample‐path analysis, linear programming, and the tower property of conditional expectation, we characterize the optimal component replenishment policy and common‐component allocation rule, present comparative statics of the optimal policy parameters, and show that some commonly used heuristic policies can lead to significant optimality loss. The optimality results require certain symmetry in the cost parameters. In the absence of this symmetry, we show that, for systems with high demand volume, the asymptotically optimal policy has essentially the same structure; otherwise, the optimal policies have no clear structure. For these latter systems, we develop heuristic policies and show their effectiveness. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 62: 617–645, 2015 相似文献