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221.
    
In this paper we consider n jobs and a number of machines in parallel. The machines are identical and subject to breakdown and repair. The number may therefore vary over time and is at time t equal to m(t). Preemptions are allowed. We consider three objectives, namely, the total completion time, ∑ Cj, the makespan Cmax, and the maximum lateness Lmax. We study the conditions on m(t) under which various rules minimize the objective functions under consideration. We analyze cases when the jobs have deadlines to meet and when the jobs are subject to precedence constraints. © 2003 Wiley Periodicals, Inc. Naval Research Logistics, 2004.  相似文献   
222.
两栖攻击舰作战系统   总被引:1,自引:0,他引:1  
未来的两栖战舰将进一步强化立体两栖突击能力,将普遍设置直升机机库和飞行平台,并将携带气垫登陆艇,甚至地效翼飞行器、偏转翼飞机等立体两栖突击装备;另一方面强化自身的防御武器,除了常规的中小口径舰炮外,普遍都装备导弹发射装置;此外,舰上都设有由通信系统和计算机组成的、能处理多批目标、反应快、自动化程度高的两栖指挥控制系统。本文介绍美两栖攻击舰(LHA)和两栖船坞运输舰(LPD)的作战系统及其设备。  相似文献   
223.
一种军用文图自动转换方案   总被引:1,自引:0,他引:1  
军事标图自动化是军队指挥自动化的基础性工作之一.信息抽取是一种实用性强的自然语言处理技术.提出一种军用文图自动转换方案,它利用信息抽取技术实现,无须计算机完全理解标图文书,具有可操作性强的特点.同时,该方案以图标信息作为文本与图形的接口,可保证领域之间的独立性,便于领域信息的保密和不同领域之间的合作.对抽取标图信息的MIE(军用信息抽取)系统的抽取情况进行了初步评估,评估结果表明MIE系统具有一定的实用性.  相似文献   
224.
    
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 λi. 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 λi'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  相似文献   
225.
    
An important aspect of supply chain management is dealing with demand and supply uncertainty. The uncertainty of future supply can be reduced if a company is able to obtain advance capacity information (ACI) about future supply/production capacity availability from its supplier. We address a periodic‐review inventory system under stochastic demand and stochastic limited supply, for which ACI is available. We show that the optimal ordering policy is a state‐dependent base‐stock policy characterized by a base‐stock level that is a function of ACI. We establish a link with inventory models that use advance demand information (ADI) by developing a capacitated inventory system with ADI, and we show that equivalence can only be set under a very specific and restrictive assumption, implying that ADI insights will not necessarily hold in the ACI environment. Our numerical results reveal several managerial insights. In particular, we show that ACI is most beneficial when there is sufficient flexibility to react to anticipated demand and supply capacity mismatches. Further, most of the benefits can be achieved with only limited future visibility. We also show that the system parameters affecting the value of ACI interact in a complex way and therefore need to be considered in an integrated manner. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011  相似文献   
226.
    
After the fall of the Berlin Wall, European governments adopted a hands‐off policy towards the defence industrial base, in an attempt to increase the sector’s efficiency and reactivity. In this context, one topical issue is how to motivate defence firms to apply for private rather than public finance. Since banks have no prior experience with European defence firms, a problem of asymmetric information may block this transition. The problem is analysed within the framework of a game between defence firms and banks. It is shown that the Bayesian Equilibrium might correspond to a situation where low‐risk firms prefer the state‐financed scheme; yet, in a perfect information set‐up, the same firms would apply for bank credit. In order to facilitate the transition to private finance, the government might decide to subsidize investors who agree on financing defence firms; the state aid should be made available during a transitory learning period.  相似文献   
227.
鱼雷攻击占位相关参数计算   总被引:1,自引:0,他引:1  
讨论了鱼雷攻击占位机动过程中,最小占位速度和最短占位时间的计算问题,采用数值计算分析方法,得出了各种不同敌我初始态势和相对运动速度下对应最短占位时间的占位点的分布规律,推导出最小占位速度和最短占位时间的计算公式。  相似文献   
228.
对敌后侦察反军事诱骗的远程火力打击战法的定量分析是战役研究中尚未解决的关键问题之一,根据信息作战原理,运用仿真和统计学分析的混合方法,建立基于概率的二人非零和(TPNZS)非合作博弈模型,设计基于侦察与诱骗博弈的远程火力打击战法,定量分析我方的敌后侦察和敌方的军事诱骗对远程信息与火力联合打击能力的影响,并对一个典型实例的初步试验及分析结果表明:与敌后侦察和军事诱骗有关的正确识别目标和错误识别目标的概率以及远程火力命中目标的概率是评估远程信息与火力联合打击能力的关键,而对评估结果进行博弈分析则是远程火力打击战法设计的关键,用识别正确目标和错误目标能力以及远程火力命中目标能力描述的基于敌后侦察与诱骗博弈的远程火力最优打击战法为Δ*=(0,Δ2*,1-Δ2*)=(0.0000,0.7727,0.2273),被打击方对远程火力打击的最优战法为π*=(π1*,0,1-π1*)=(0.8511,0.0000,0.1489)。  相似文献   
229.
根据信息作战需要,总结出作战指挥信息效能评估分层指标,运用物元分析理论构造了评估模型,并结合具体实例验证了此模型的可行性和实用性。该方法能够有效结合定性与定量分析,且模型结构简单规范,为作战指挥信息效能的评估提供了一种较为有效的方法和途径。  相似文献   
230.
针对联合作战中分布、动态的战场环境和海量的战场信息,满足不同作战实体对战场信息资源共享的需求,构建了一个基于多智能体的、面向作战任务的信息资源共享模型,并提出了一种新颖的基于相似度的用户动态聚类方法。从用户的资源请求中发现用户兴趣和用户之间的相似度,通过交互机制有效地将相同兴趣的用户及资源智能体关联起来,提高作战主体获取战场信息的能力。实验证明该算法具有较高的效率和良好的可扩展性。  相似文献   
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