火控雷达协同防空目标跟踪技术

针对火控雷达抗反辐射导弹的对抗要求,将雷达组网理论应用于火控雷达,提出了火控雷达协同防空目标跟踪方法.首先分析了火控雷达目标跟踪原理,同时给出了跟踪性能的评价指标;其次,为了克服单部雷达的局限性研究了组网火控雷达目标跟踪方法;而后,研究了不同的交替周期对系统的影响;最后对不同工作模式的跟踪效果进行了仿真.结果证明采用组网雷达目标跟踪方法可以同时实现对反辐射导弹载机的准确跟踪和对反辐射导弹的有效对抗.     

城市综合体灭火救援技战术研究

城市综合体的自身特点及使用的复杂性,决定其具有较大的火灾危险性.从分析城市综合体的建筑特点和影响灭火救援的因素入手,论述了其灭火救援工作中的指导思想、火情侦察、人员疏散、火场排烟及灭火战术运用等环节,为该类火灾事故的高效处置提供参考.     

基于K均值排序方法的频域盲分离算法

针对频域盲分离算法中存在的排序不确定性问题,提出一种基于K-means算法的排序方法。该方法在排序中使用K-means算法对分离子信号进行整体排序,与传统相邻频点排序方法相比,大大提高了盲源分离的鲁棒性。仿真结果表明了该方法的有效性。     

On fair designs of cross-chain exchange for cryptocurrencies via Monte Carlo simulation

Cryptocurrency is one of the earliest and the most successful applications of blockchain, and it utilizes the distributed ledger, which is a commonly used technique in blockchain, to make a decentralized transaction within the blockchain of a cryptocurrency. However, how to make a decentralized transaction of cryptocurrencies between parties on different blockchains, that is, the cross-chain exchange, is not well-studied. In this paper, we develop a new method to make cross-chain exchanges based on the classical atomic swap. We first study the optionality embedded into the atomic swap and propose to add a premium into the atomic swap, and then design a new procedure with the premium to guarantee the fairness of the cross-chain exchange. We also provide an algorithm based on the least-squares Monte Carlo method to estimate the premium and analyze the convergence of the algorithm. Moreover, we study the cross-chain exchange with margin trading. We propose an adapted exchange procedure to make a fair cross-chain exchange and an algorithm to estimate the fair premium under the margin trading. Numerical experiments are provided to show the effectiveness of the algorithms.     

抗战期间国民政府在黄泛区的资源整合与国家调度——以豫东地区为例

1938年6月花园口决堤后,国民政府从民族抗战大局出发,对豫东黄泛区进行了一系列的资源整合和国家调度活动,目的在于增进灾区民众的凝聚力和对敌斗争的信心.主要有:一、开展大规模的政治宣传,给灾区和难民以道德旌扬和精神抚慰;二、密切关注新黄河的水势水情,扩大以水代兵的军事价值;三、制定善后政策,规范善后活动,增进善后力度;四、采取具体措施,对难民实施直接救助和救济.这些活动未必都卓有成效,但是在当时极其艰难的斗争条件下,对于拯救灾民、聚拢人心、激发民族抗战意志、实行持久抗战所起的作用,还是应当给予应有的肯定的.     

分布式灾难恢复系统

分布式灾难恢复系统采用客户层、服务层和管理层3部分组织形式,完成数据的网络备份和恢复,并提供管理功能。系统通过构建分布式远程备份体系结构,采用ACE(自适配通信环境)面向对象构架,线程池和反应器编程模式,实现了网络互连、事件驱动程序设计,完成了备份计划制订、数据备份、数据恢复3个阶段各个模块的功能。     

云重心评判法在防空群作战指挥效能评估中的应用

从防空群作战指挥的几个环节--指挥信息的获取、作战决策、组织计划和协调控制入手,建立了防空群作战指挥效能的指标体系,对各指标进行了合理的权重分配,建立了云重心评判模型并进行了实例分析,对防空群作战指挥效能进行了评估,其结果可信.所用到的云重心法对于评估复杂且难以完全定量描述的问题时具有一定的参考价值.     

Efficient generation of cycle time‐throughput curves through simulation and metamodeling

A cycle time‐throughput (CT‐TH) curve, which quantifies the relationship of long‐run average cycle time to throughput rate, plays an important role in strategic planning for manufacturing systems. In this paper, a nonlinear regression metamodel supported by queueing theory is developed to represent the underlying CT‐TH curve implied by a manufacturing simulation model. To estimate the model efficiently, simulation experiments are built up sequentially using a multistage procedure. Extensive numerical experiments are presented to demonstrate the effectiveness of the proposed procedure. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

Machine maintenance with workload considerations

Machine maintenance is modeled in the setting of a single‐server queue. Machine deterioration corresponds to slower service rates and failure. This leads to higher congestion and an increase in customer holding costs. The decision‐maker decides when to perform maintenance, which may be done pre‐emptively; before catastrophic failures. Similar to classic maintenance control models, the information available to the decision‐maker includes the state of the server. Unlike classic models, the information also includes the number of customers in queue. Considered are both a repair model and a replacement model. In the repair model, with random replacement times, fixed costs are assumed to be constant in the server state. In the replacement model, both constant and variable fixed costs are considered. It is shown in general that the optimal maintenance policies have switching curve structure that is monotone in the server state. However, the switching curve policies for the repair model are not always monotone in the number of customers in the queue. Numerical examples and two heuristics are also presented. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007