信息化条件下作战体系节点重要性指标的选择

在对作战体系结构信息化演化分析的基础上,对其结构进行网络描述,引入度指标、介数指标、紧密度指标和特征向量指标等节点重要性度量指标,并根据最大连通分支的大小和平均路径长度对作战体系受到攻击后的受损程度进行度量,进而选择出最有效的重要性指标,是对作战体系节点重要性指标选择的有益探索,可以为体系对抗中关键节点判定等问题的深入...     

航路规划中数字地图综合处理技术

以中远程反舰导弹航路规划为背景,研究了数字地图应用的相关处理技术。首先介绍了数字高程模型及其相应的处理技术,其次论述了对数字海图进行网格划分的基本原则,然后分析了计算地图上每个网格单元的代价MC(Map Cost)所需考虑的主要因素,最后给出由MC生成的最小代价BC(Best Cost)的方法,为下一步航路规划算法的实现奠定了基础。     

多阶段任务系统可靠性并联冗余优化模型

多阶段任务系统是一类普遍存在的复杂系统,研究其可靠性冗余优化对于该类系统设计具有重要的参考价值。针对多阶段任务系统的可靠性并联冗余优化问题,提出了采用冗余故障树和冗余BDD来描述系统冗余结构的方法。给出了冗余模块在多阶段任务系统中的可靠度计算方法,建立了整个冗余多阶段任务系统可靠度计算模型。在此基础上以费用最小为目标,构建多阶段任务系统可靠性冗余优化模型,并应用微粒群算法对模型进行求解。算例验证了模型的合理性及算法的有效性。     

Production‐inventory systems with imperfect advance demand information and updating

We consider a supplier with finite production capacity and stochastic production times. Customers provide advance demand information (ADI) to the supplier by announcing orders ahead of their due dates. However, this information is not perfect, and customers may request an order be fulfilled prior to or later than the expected due date. Customers update the status of their orders, but the time between consecutive updates is random. We formulate the production‐control problem as a continuous‐time Markov decision process and prove there is an optimal state‐dependent base‐stock policy, where the base‐stock levels depend upon the numbers of orders at various stages of update. In addition, we derive results on the sensitivity of the state‐dependent base‐stock levels to the number of orders in each stage of update. In a numerical study, we examine the benefit of ADI, and find that it is most valuable to the supplier when the time between updates is moderate. We also consider the impact of holding and backorder costs, numbers of updates, and the fraction of customers that provide ADI. In addition, we find that while ADI is always beneficial to the supplier, this may not be the case for the customers who provide the ADI. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

Modeling and analysis of flexible queueing systems

We consider queueing systems with multiple classes of customers and heterogeneous servers where customers have the flexibility of being processed by more than one server and servers possess the capability of processing more than one customer class. We provide a unified framework for the modeling and analysis of these systems under arbitrary customer and server flexibility and for a rich set of control policies that includes customer/server‐specific priority schemes for server and customer selection. We use our models to generate several insights into the effect of system configuration and control policies. In particular, we examine the relationship between flexibility, control policies and throughput under varying assumptions for system parameters. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

Development programs for one‐shot systems using multiple‐state design reliability models

Design reliability at the beginning of a product development program is typically low, and development costs can account for a large proportion of total product cost. We consider how to conduct development programs (series of tests and redesigns) for one‐shot systems (which are destroyed at first use or during testing). In rough terms, our aim is to both achieve high final design reliability and spend as little of a fixed budget as possible on development. We employ multiple‐state reliability models. Dynamic programming is used to identify a best test‐and‐redesign strategy and is shown to be presently computationally feasible for at least 5‐state models. Our analysis is flexible enough to allow for the accelerated stress testing needed in the case of ultra‐high reliability requirements, where testing otherwise provides little information on design reliability change. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2004     

一种基于MTS的网络区域管理工作站实现策略

网络扩容的一个重要障碍是异构子网连接后的互连管理问题。分区域的一体化管理无疑是一种解决办法。本文提出一种基于管理协议细栈(MTS)来构造一体化的区域管理中心(RMC)的策略,这里的 RMC 可实现彼此间的管理通信和互操作,从而也解决了扩容后的互连管理问题。结合正在进行的工程实践,文章还进一步从技术角度上讨论了实现策略。     

The Two Techniques of O. Henry＇s

O. Henry is the founder of American modern short story. What makes his sto-ries enjoy mostt popularity is his own styles ---- (1) Reasonable artistic exaggeration. (2)Unexpected ending. In this article I emphatically comment its value in the two stories : TheRomance of a Busy Broker and The Last Leaf. Up to now there is still much in Henry‘s method that we can make use of beneficially.     

单片可编程数字信号处理器(DSP)在控制领域的应用趋势

分析了单片可编程数字信号处理器的特性,并着重同普通微处理器、微控制器作了结构及性能上的比较。介绍了现有的DSP 并预测了DSP 在控制领域中的应用趋势。     

基于条件事件代数理论的战术防空态势评估

态势评估是战场决策的基础,而如何进行正确的战场决策对防空战斗有着重要的影响.在对态势评估进行分析的基础上,根据条件事件代数理论,提出了一种对战术防空态势评估问题进行推理的方法,并通过示例介绍了对战术防空态势评估问题进行求解的过程.同时该方法也为解决战术防空态势评估问题提供了一种有效依据.