Availability analysis of a two-unit series system with a priority shut-off rule

This study shows that the steady-state availability of a two-unit series system, which operates under a one-direction shut-off rule with a preemptive repair priority for unit 1, depends only on the first-order system parameters. First we obtain both transient and steady-state system availability and failure frequency when the lifetime of Unit 1 is Erlang and the other distributions are general. When the lifetime of Unit 1 is general, the system process has no regenerative point. Using supplementary variables, we establish a vector Markov process and hence transfer the problem to the solution of a system of integrodifferential equations. We can then obtain explicit formulas for the steady-state system availability and failure frequency, respectively. In concluding this article we make some conjectures on series systems and point out future research opportunities. © 1996 John Wiley & Sons, Inc.     

无人直升机辨识的一种新方法

针对无人直升机的辨识建模问题,提出了把频率响应辨识法和遗传算法相结合的一种新的辨识方法.该方法充分结合了频率响应辨识法抗噪声能力强、对输入信号通用性强、以及遗传算法的全局寻优特性的优点,极大地提高了辨识的准确性.与最小二乘法、Levy方法的对比仿真结果表明,这种方法辨识精度更高,具有重要的工程使用价值.     

推进军队党内民主建设的创新工程——学习《中国共产党军队各级代表大会代表任期制实施办法(试行)》

中央军委颁发实施的<党代表任期制实施办法(试行)>,具有很强的思想性、规范性和可操作性,是推进军队党内民主建设的重大举措.要充分认清重大意义,提高贯彻落实<党代表任期制实施办法>的自觉性;准确把握内容实质,增强贯彻落实的针对性;建立健全保障措施,确保贯彻落实的实效性.     

渡江战役胜利对打赢信息化战争的启示

回顾渡江战役胜利历史,对打赢信息化战争提供了有益的启示:战争打的是利益,强敌干预皆必然;打赢信息化战争,必须站在国际政治格局的高度整体筹划.政治指引着军事,军事服务于政治;打赢信息化战争,必须围绕最高政治斗争的需要统筹考虑.战役之前细筹划,战斗实施巧变化;打赢信息化战争,必须采取机动灵活高效的战略战术.战役最后得胜利,人民群众是靠山;打赢信息化战争,必须创新人民战争的战略思想.     

A partial characterization of the optimal ordering/rationing policy for a periodic review system with two demand classes and backordering

We consider a finite horizon periodic review, single product inventory system with a fixed setup cost and two stochastic demand classes that differ in their backordering costs. In each period, one must decide whether and how much to order, and how much demand of the lower class should be satisfied. We show that the optimal ordering policy can be characterized as a state dependent (s,S) policy, and the rationing structure is partially obtained based on the subconvexity of the cost function. We then propose a simple heuristic rationing policy, which is easy to implement and close to optimal for intensive numerical examples. We further study the case when the first demand class is deterministic and must be satisfied immediately. We show the optimality of the state dependent (s,S) ordering policy, and obtain additional rationing structural properties. Based on these properties, the optimal ordering and rationing policy for any state can be generated by finding the optimal policy of only a finite set of states, and for each state in this set, the optimal policy is obtained simply by choosing a policy from at most two alternatives. An efficient algorithm is then proposed. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010     

工业站电气集中设备微机监测系统的设计与实现

给出了工业火车站电气集中设备微机监测系统的设计方案,对系统设计中的抗干扰和系统的功能扩展等问题做了较详尽的研究。     

导弹电子设备电源线传导敏感度测试研究

采用ＣＳ０１测试法对导弹武器系统的电子设备进行电源线传导敏感度测试,由于测试指标和测试方法的限定要求,将不仅影响受试电子设备的正常工作,而且还会对ＣＳ０１设备本身产生不利影响。在分析产生上述影响原因的同时,有针对性地提出了有效的解决措施,使由于限定要求带来的不利影响降低到最低限度,以使导弹电子设备电源线传导敏感度测试能按国军标规定要求正常进行。     

防空导弹武器系统目标分配的多种算法

叙述了防空导弹武器系统目标分配的一般数学模型。在此基础上,建立了防空导弹的5种目标分配数学优化算法,并讨论了数学模型的求解问题。最后,对这5种数学优化算法进行了比较。     

带紧扰动的m-增生算子的满值性定理

引入“DC”空间的概念,研究了带紧扰动的m－增生算子的满值性问题,改进了Kartsatos、Deimling、周海云以及徐宗本等人的结果。     

从美军信息战计划谈我军炮兵指挥系统现状及发展方向

在未来战争中,信息战是决定战争胜负的关键。为此,美军制定了十分庞大的“打赢信息战”计划,高度重视建立数字化部队,以保持在未来战争中的优势。从美军的“打赢信息战”计划入手,分析了我军炮兵自动化指挥系统研制的现状和与外军相比存在的差距,探索性地提出了发展我军炮兵指挥系统所要解决的问题,指出了发展新装备的方向