武器装备体系能力多视图模型研究

针对武器装备体系能力概念抽象、关系复杂特点导致建模困难、重用性差、语义不一致等诸多问题,提出了一种基于本体的能力多视图模型构建方法,建立了6个能力视图的元模型.该方法首先明确能力领域问题,确定武器装备体系能力领域核心本体及构建原则,然后采用形式化方法描述本体,建立核心本体的关系模型,最后面向能力视图内容建立元模型,通过...     

基于关联分析法的指挥引导方式优化研究

指挥引导是作战指挥的重要组成部分,指挥引导效率的高低直接关系到作战效能的发挥。现代战争条件下,为完成某一作战任务,所需出动的兵力较多,空中态势复杂,如何合理分配指挥引导机构的指挥引导任务,选择有利的引导方式,对完成任务影响很大。因此,结合指挥引导的特点和要求,对指挥引导能力进行分析,设定相关参数的具体示例,运用动态规划理论、关联分析方法,通过建模和解算,确定各项指标的关联度,尝试解决影响指挥引导能力分配诸多复杂因素的关联问题,对指挥引导方式进行优化。     

On‐line parameter estimation for a partially observable system subject to random failure

In this paper, we study the on‐line parameter estimation problem for a partially observable system subject to deterioration and random failure. The state of the system evolves according to a continuous time homogeneous Markov process with a finite state space. The system state is not observable, except for the failure state. The information related to the system state is available at discrete times through inspections. A recursive maximum likelihood (RML) algorithm is proposed for the on‐line parameter estimation of the model. The RML algorithm proposed in the paper is considerably faster and easier to apply than other RML algorithms in the literature, because it does not require projection into the constraint domain and calculation of the gradient on the surface of the constraint manifolds. The algorithm is illustrated by an example using real vibration data. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006     

舰用主锅炉低负荷时升压运行对蒸汽净化的影响

分析了蒸汽压力变化对饱和蒸汽湿度和汽水分离的影响,并在模拟器上进行了定量计算,得出的结论为某型舰用主锅炉低负荷时升压运行提供了理论依据.     

On‐line algorithms for minimizing makespan on batch processing machines

We consider problem of scheduling jobs on‐line on batch processing machines with dynamic job arrivals to minimize makespan. A batch machine can handle up to B jobs simultaneously. The jobs that are processed together from a batch, and all jobs in a batch start and complete at the same time. The processing time of a batch is given by the longest processing time of any job in the batch. Each job becomes available at its arrival time, which is unknown in advance, and its processing time becomes known upon its arrival. In the first part of this paper, we address the single batch processing machine scheduling problem. First we deal with two variants: the unbounded model where B is sufficiently large and the bounded model where jobs have two distinct arrival times. For both variants, we provide on‐line algorithms with worst‐case ratio (the inverse of the Golden ratio) and prove that these results are the best possible. Furthermore, we generalize our algorithms to the general case and show a worst‐case ratio of 2. We then consider the unbounded case for parallel batch processing machine scheduling. Lower bound are given, and two on‐line algorithms are presented. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 241–258, 2001     

Brinkmanship,not COIN,in Pakistan’s post-9/11 Internal War

Politics is critical to making sense of Pakistani successes and failures in dealing with non-state armed groups. This includes domestic political currents; regional political currents; and the global impetus of the post-9/11 era. How these currents overlap renders to any reading of insurgency in Pakistan real complexity. This article engages with this complexity rather than shirking from it. Its hypothesis is that while the insurgency bordering Afghanistan has been an epicentre of Pakistani military efforts to fight the Taliban, this theatre is in of itself insufficiently inclusive to grasp the nature of Pakistan’s security challenges and its consequent responses.     

Rendezvous search when marks are left at the starting points

Leaving marks at the starting points in a rendezvous search problem may provide the players with important information. Many of the standard rendezvous search problems are investigated under this new framework which we call markstart rendezvous search. Somewhat surprisingly, the relative difficulties of analysing problems in the two scenarios differ from problem to problem. Symmetric rendezvous on the line seems to be more tractable in the new setting whereas asymmetric rendezvous on the line when the initial distance is chosen by means of a convex distribution appears easier to analyse in the original setting. Results are also obtained for markstart rendezvous on complete graphs and on the line when the players' initial distance is given by an unknown probability distribution. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 722–731, 2001     

Birth of a norm champion: how South Africa came to support the NPT’s indefinite extension

In 1995, South Africa was in a special position. It was: a new party to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), the first country to voluntarily renounce nuclear weapons, led by a charismatic leader, and seen as a champion of disarmament principles. Yet South Africa’s new leaders were also interested in affirming their position within the Non-Aligned Movement, which was adamantly opposed to the NPT’s indefinite extension. Why, then, did South Africa decide to support the indefinite extension of the NPT in 1995? Existing scholarship has ascribed too much credit to pressure from the United States, overlooking domestic debates in South Africa and the bifurcation between professional diplomats and political elites. This article, building on new archival sources and in-depth oral-history interviews with major actors, demonstrates that South African diplomats opposed indefinite extension while South African policy elites allocated little attention to the topic until late in the game. The findings contribute to our understanding of South Africa’s norm entrepreneurship, as well as the politics of global nonproliferation.     

加工中心用触发式测头系统监测方法研究

主要研究了在数控加工中心ARROW500上使用触发式测头(英国Renishaw的MP12测头)实现零件加工的自动监测,通过深入研究用触发式测头在加工中心上实现在线监测的方法,使加工零件的序前调整、找正,序中监控及序后测量等可自动完成,实现了加工中心高效率、高自动化的监测。     

非接触爆炸作用下舰船动力系统生命力的研究方法

分析非接触爆炸作用下舰船动力系统中主要设备的破坏模式 ,建立了动力设备的冲击响应模式 ,并给出了在非接触爆炸作用下用于舰船动力系统生命力评估的系统破坏概率计算机仿真计算方法。