模糊综合评判舰艇编队防空武器协同共用效能评估

为定量评估水面舰艇编队防空武器协同共用效能,依据舰艇编队对空防御的作战过程和信息流程,确立了防空武器协同共用效能评估指标体系,建立了基于模糊综合评判的防空武器协同共用效能评估模型。采用改进的层次分析法确定各因素的权重,运用模糊综合评判的方法,进行了综合的定量分析和应用计算,模型比较准确地反映了各种主要因素对防空武器协同共用效能的影响,为评价舰艇编队防空武器协同共用效能提供了分析依据。     

防空C~3I系统作战效能评估

为了更好地认识防空C3I在现代防空作战中的作用,了解我军防空C3I的作战效能,立足我军防空C3I装备现状,根据其技术性能及作战使用方法,依托已有研究成果,采取新的研究思想,运用W SE IAC法评估了防空C3I的作战效能。这种评估思想紧贴防空作战的实际,最大限度地衡量了防空C3I在作战中的性能发挥程度,对今后进行深入的研究发展,具有一定的参考价值。     

城市防空中目标优化分配的模糊聚类分析

定性和定量相结合,利用模糊聚类分析法确定目标的优先防护次序。先构造城市防空中需掩护的目标体系;再依据目标权重建立多因素模糊关系矩阵,导出等价矩阵;最后计算出基于给定参数λ的需防护目标的优先次序,得出目标分类聚类图。变模糊的、复杂的问题为直观的结论,为指挥员合理分配兵力兵器提供可靠的依据,从而最大限度地发挥防空兵器的作战效能。     

防空导弹武器系统探测拦截低空飞行器模型

在分析了防空导弹武器系统探测和拦截低空飞行器影响因素的基础上,建立了在综合考虑雷达散射面积、飞行高度、阵地遮蔽角和电磁干扰环境下,防空导弹武器系统对低空飞行器的探测和拦截模型,为防空作战方案的仿真论证、防空武器的火力分配方案生成提供依据。实际使用证明,该模型贴近实战,可信度高。     

星上高功率放大器对导航信号载波跟踪性能的影响分析

由于滤波器带宽的限制和高功率放大器(HPA)的非线性效应,使恒包络导航信号产生失真,这将引起导航信号载波跟踪时锁相环(PLL)跟踪性能的恶化。针对这个问题,建立了星上高功率放大器非线性失真的一般模型,并推导了HPA的非线性效应引起PLL跟踪抖动的表达式,然后仿真分析了不同信号体制、不同滤波器带宽和不同功率放大器模型下的PLL跟踪抖动性能。     

移动式防空C3I系统性能分析与软件仿真试验床

从对移动式防空C3I系统性能分析与软件仿真试验床(TEST BED)的需求分析开始,给出了试验床的体系结构,阐述了试验床的功能、原理及软件系统的构成,最后分析了开发该试验床的意义.     

Striking a deal on the F-35: multinational politics and US defence acquisition

Why does joint defence production of advanced weapons systems, which appears like a logical choice at first, become harder for both the primary production state and its allies to manage and justify as the acquisition process runs its course? To answer this question, we analyze the multinational politics of the F-35 JSF with a focus on how secondary states who have bought into the program are affected by domestic politics within the primary production state. We find that US congressional and bureaucratic politics, cuts to US defence spending, and a desire to retain tight control over the program has locked allies into a program with which they have little leverage. Potentially losing the ability to fight along side the US if they don’t follow through, coupled with inter-Alliance pressures, leaves secondary states who are involved with the F-35 program, vulnerable to the whims of US domestic politics.     

柔石《二月》:因着诚挚深入而丰富

柔石是“左联五烈士”中最具艺术潜质的作家。一般认为,他的代表作中篇小说《二月》纯熟地表现了青年知识者的追求,揭示了中国封建传统强大惯性重压下个人奋斗、人道主义理想的碰壁。但对于以主人公萧涧秋为代表的一代青年知识分子固有的人格缺失,以及由此造成的不必要的生存处境的尴尬、环境恶化,分析仍欠深人,因而遮蔽了《二月》这部作品主题意蕴应有的丰富性,也在客观上影响了对于柔石这位作家杰出艺术才能的认识。     

Markovian approximation for manufacturing systems of unreliable machines in tandem

This paper studies production planning of manufacturing systems of unreliable machines in tandem. The manufacturing system considered here produces one type of product. The demand is assumed to be a Poisson process and the processing time for one unit of product in each machine is exponentially distributed. A broken machine is subject to a sequence of repairing processes. The up time and the repairing time in each phase are assumed to be exponentially distributed. We study the manufacturing system by considering each machine as an individual system with stochastic supply and demand. The Markov Modulated Poisson Process (MMPP) is applied to model the process of supply. Numerical examples are given to demonstrate the accuracy of the proposed method. We employ (s, S) policy as production control. Fast algorithms are presented to solve the average running costs of the machine system for a given (s, S) policy and hence the approximated optimal (s, S) policy. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 65–78, 2001