Two‐stage component test plans for testing the reliability of a series system

A system reliability is often evaluated by individual tests of components that constitute the system. These component test plans have advantages over complete system based tests in terms of time and cost. In this paper, we consider the series system with n components, where the lifetime of the i‐th component follows exponential distribution with parameter λ_i. Assuming test costs for the components are different, we develop an efficient algorithm to design a two‐stage component test plan that satisfies the usual probability requirements on the system reliability and in addition minimizes the maximum expected cost. For the case of prior information in the form of upper bounds on λ_i's, we use the genetic algorithm to solve the associated optimization problems which are otherwise difficult to solve using mathematical programming techniques. The two‐stage component test plans are cost effective compared to single‐stage plans developed by Rajgopal and Mazumdar. We demonstrate through several numerical examples that our approach has the potential to reduce the overall testing costs significantly. © 2002 John Wiley & Sons, Inc. Naval Research Logistics, 49: 95–116, 2002; DOI 10.1002/nav.1051     

分块模幂算法

RSA是目前最成熟的一种公钥密码体系 ,RSA加解密算法的速度依赖于模幂算法 ,因而快速模幂算法一直是人们感兴趣的课题。该文提出了一种基于分块的模幂算法 ,对算法复杂性进行了讨论 ,并与其他模幂算法作了比较 ,从理论上论证了它具有更快的模幂速度     

代理型防火墙Cache策略的研究与实现

在代理型防火墙中设置Cache,可以有效地减少响应延迟和降低网络带宽。对Cache实现中的信息过滤规则、过期页面处理和替换算法几个关键技术进行了深入研究,并提出了一种基于防火墙日志系统开销极小的Cache管理策略。     

航空电子多总线记录系统的设计与实现

讨论了某型航空电子设备的数据记录系统的设计与实现 ,主要探讨了此系统的软、硬件开发 ,系统组成及其信息流。系统采用了 ARINC4 2 9总线和并行总线 ,将各个子系统连接起来 ,实现数据的综合处理、综合控制、综合传输 ,在实际应用中收到了很好的效果     

C4ISR系统信息融合模型研究

首先阐明了信息融合系统中的几个容易混淆的基本概念,介绍并分析了现有的几种信息融合系统模型及其优缺点.然后在分析C4ISR系统中信息融合处理特点的基础上,提出C4ISR系统动态信息融合的概念,并在此基础上提出一种C4ISR动态信息融合模型.最后简要介绍了基于该模型的C4ISR信息融合系统设计.     

数字化部队指挥网络系统效能评价模型

以结构熵理论为基础,分析数字化部队作战指挥信息网络系统组织结构对系统内信息流的影响,从信息的角度对系统组织结构的有序度进行评价,引入信息流的时效和质量的概念,建立定量评价系统结构有序度计算的时效质量模型,结合系统数据传输业务效能的评价方法,形成作战指挥信息网络系统整体综合效能的评价模型。最后辅以实例。     

雷达情报特征的Bayes识别方法

根据雷达情报目标判性应用背景,对Bayes方法在该领域的应用进行了研究,初步建立了基于雷达情报特征的统计模型,并在算法的收敛速度和稳健性等方面与D-S证据理论进行了比较。仿真结果表明,Bayes方法对先验信息的精确程度要求并不十分严格,能较好地解决雷达情报综合问题。     

Scheduling of depalletizing and truck loading operations in a food distribution system

This paper studies a scheduling problem arising in a beef distribution system where pallets of various types of beef products in the warehouse are first depalletized and then individual cases are loaded via conveyors to the trucks which deliver beef products to various customers. Given each customer's demand for each type of beef, the problem is to find a depalletizing and truck loading schedule that fills all the demands at a minimum total cost. We first show that the general problem where there are multiple trucks and each truck covers multiple customers is strongly NP‐hard. Then we propose polynomial‐time algorithms for the case where there are multiple trucks, each covering only one customer, and the case where there is only one truck covering multiple customers. We also develop an optimal dynamic programming algorithm and a heuristic for solving the general problem. By comparing to the optimal solutions generated by the dynamic programming algorithm, the heuristic is shown to be capable of generating near optimal solutions quickly. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2003     

基于SOM网络信息融合的飞机作战效能评估

根据SOM自组织神经网络原理,构建了基于多参数信息融合的飞机作战效能评估模型,并采用可视化方法对飞机空战效能进行了评估。通过效能评估模型的二维拓扑有序映射图和单参数灰度图,可以清晰地观察到不同型号飞机的作战效能特征、参数相关性特征、参数变化趋势和对飞机作战效能的相似性预测。     

武器控制系统战斗有效性分析

分析了武器控制系统对机载武器系统战斗有效性的影响因素,定量描述了各影响因素,给出了影响战斗有效性程度的指数,并研究了其计算的方法。根据计算结果,得到了战斗有效性的损失变化范围,这一变化范围可作为评价武器控制系统优劣的重要依据,最后给出了具体算例和说明。