无线自组织网络跨层攻击检测博弈模型

无线自组织网络中的跨层攻击具有比单层攻击更强的隐蔽性、更好的攻击效果或更低的攻击成本.为了检测无线自组织网络中的跨层攻击,提出了一种基于博弈论的攻击检测模型.由于攻击不可避免地会对各协议层的参数造成影响,因此模型从协议层攻防博弈的角度,建立起相应的策略矩阵和支付矩阵,并通过均衡分析得到该模型的混合策略纳什均衡解.仿真结...     

Disruption management in production planning

We study the problem of recovering a production plan after a disruption, where the disruption may be caused by incidents such as power failure, market change, machine breakdown, supply shortage, worker no‐show, and others. The new recovery plan we seek after has to not only suit the changed environment brought about by the disruption, but also be close to the initial plan so as not to cause too much customer unsatisfaction or inconvenience for current‐stage and downstream operations. For the general‐cost case, we propose a dynamic programming method for the problem. For the convex‐cost case, a general problem which involves both cost and demand disruptions can be solved by considering the cost disruption first and then the demand disruption. We find that a pure demand disruption is easy to handle; and for a pure cost disruption, we propose a greedy method which is provably efficient. Our computational studies also reveal insights that will be helpful to managing disruptions in production planning. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005.     

An approximate planning model for distributed computing networks

We develop an approximate planning model for a distributed computing network in which a control system oversees the assignment of information flows and tasks to a pool of shared computers, and describe several optimization applications using the model. We assume that the computers are multithreaded, and have differing architectures leading to varying and inconsistent processing rates. The model is based on a discrete‐time, continuous flow model developed by Graves [Oper Res 34 (1986), 522–533] which provides the steady‐state moments of production and work‐in‐queue quantities. We make several extensions to Graves' model to represent distributed computing networks. First, we approximately model control rules that are nonlinear functions of the work‐in‐queue at multiple stations through a linearization approach. Second, we introduce an additional noise term on production and show its use in modeling the discretization of jobs. Third, we model groups of heterogeneous computers as aggregate, “virtual computing cells” that process multiple tasks simultaneously, using a judiciously selected control rule. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005.     

基于FNNs的闭式循环柴油机配氧前馈控制策略研究

配氧控制是闭式循环柴油机(CCD)系统的关键技术之一,为改善其动态特性,在 PID反馈控制的基础上,设计了基于模糊神经网络(FNNs)模型的前馈控制器,并采用 PID反馈控制输出信号作为网络训练的误差信号,使模糊神经网络逐步具有前馈补偿能力,从而能够有效对负荷扰动进行及时补偿.仿真结果表明,采用FNNs前馈控制器后,可以有效改善氧气控制的动态特性,并且具有快速的学习速度和很强的适应能力.     

基于特征融合的刀具磨损监测方法

提出了一种基于特征融合的刀具磨损监测方法,将该方法应用于铣刀磨损监测取得了较好的效果,文中论述了特征融合方法的基本思想,多传感器信号的特征关联、抽取及正规化处理,作为融合中心的神经网络的构造及训练等内容。实验分析表明,该方法实现刀具磨损监测是行之有效的。     

分布共享存储系统中程序访存行为对性能的影响

本文首先提取了分布共享存储系统（ＤＳＭ）中程序访存行为的几个重要参数,并以此建立了一个处理机效率模型。在此模型基础上分析了访存行为的各种因素对处理机效率的影响情况,文章最后给出了提高处理机效率的几种技术途径。     

美国全球作战支持系统

美国的全球作战支持系统(GCSS)是 "武士C4I"的一个组成部分,它将人员、后勤、采办、医疗等支持功能集成到一个跨功能的环境中.GCSS将实现作战支持功能之间以及作战支持与指挥控制功能之间的端对端的信息互操作,为联合作战人员提供融合、实时的多维战场视图.主要介绍了全球作战支持系统的功能、系统组成及其未来作战能力.     

差分离散方法分布式并行计算的重叠边界优化

针对分布式存储环境下显式差分方法的并行计算问题 ,依据分布式存储多处理机的体系结构特点 ,提出了一个重叠边界优化模型 ;该模型目前已成功应用于中国科学院第三代海洋环流模式的分布式并行计算优化。     

大机动格斗及近距空战的若干问题

较系统地综述了大机动格斗的一些基本战术和技术概念,引入了超机动性的一些度量,然后提出了使用具有刚体性质的质点飞机模型的可行性.最后提出在大机动格斗实战环境中,火力控制需要解决的若干问题.     

采用时序多属性评价方法的空战威胁排序

鉴于空战中威胁目标的多属性及动态变化特点,提出采用时序多属性评价方法来解决空战目标动态威胁排序问题。在建立空战威胁指标体系基础上,采用熵权法确定目标属性权重,并通过指数分布法确定各时刻权重,最后综合依据威胁目标多时刻的属性信息,实现了空战动态威胁排序。仿真结果说明该方法的合理性。