一种用于战术通信网络仿真的通信业务量模型

针对战术通信网络仿真的实际需求,在分析现有通信业务量建模方法基础上,基于吸引系数法和泊松流模型,提出了一种用于战术通信网络仿真的通信业务量建模方法。该方法依据泊松流模型构建了指挥机构生成通信业务总量模型,根据指挥机构两两之间通信业务量大小关系建立了吸引系数矩阵,依据吸引系数占比将指挥机构生成通信业务总量分配至接收用户,最后引入了不同作战阶段通信业务量强度繁忙系数。仿真结果表明,该方法能够快速有效生成指挥机构通信业务量,较好满足战术通信网络仿真需求。     

时滞细胞神经网络的代数抗饱和补偿设计

针对时滞细胞神经网络,提出了一种基于代数判据的抗饱和补偿设计。运用M矩阵理论、迪尼导数、系统参数设计了无饱和输入限制系统镇定的代数判据。在此基础上,利用不等式放缩原理、分区讨论与大中取大综合方法和Lyapunov理论,得出了二次矩阵不等式形式的抗饱和控制设计方案,进而将之转化为线性矩阵不等式。同时,给出了吸引域及其最大化方法。仿真验证了该设计方案的可行性和有效性。     

改进熵系数法的预警机探测引导能力评估

引入欧氏距离来度量基于离差最大化法与熵系数法确定的两个权重向量的相似度,在相似度最大约束条件下,确定了熵系数法中参数ρ值,解决了参数ρ取值人为主观性的问题。采用区间数来表示专家对指标间的相对重要性,克服了实际中难于得到准确决策信息的问题。将区间数特征向量法确定的主观权重和改进的熵系数法确定的客观权重集成得到组合权重,采用加权算术平均算子对4种预警机的探测引导能力进行了计算。     

饱和系统的线性最优容错不变集

针对饱和系统的容错控制问题,提出了一种D稳定约束下系统吸引域的估计方法。分别以不变集和参考集的容量为优化目标,给出了两个优化容错不变集的充分条件。为解决不变集优化中出现的双线性矩阵不等式(BMI)问题,通过构造包含线性矩阵不等式(LMI)的目标函数,将它转化为非线性规划的形式进行求解。通过一个仿真实例对该方法进行验证。     

有理真分式积分方法探析

利用配方法,待定系数法等方法求解有理真分式的积极分问题.     

模糊一致矩阵的判定定理

重新定义了模糊一致矩阵,给出了模糊一致矩阵的必要条件和判定定理．     

利用平面系数法克服系统谐振

本文讨论控制系统的平面系数模型及其降阶处理问题,从而提出利用平面系数法克服系统中的谐振影响的方法。导出了补偿参数的选择法则,最后通过一个例子说明这种方法的具体运用。     

基于改进K-L变换的特征提取技术

在模式识别中,为解决样本增加时,反复使用传统K L变换进行特征提取耗时多的缺点,提出了一种改进的K L变换方法,该方法利用快速递推算法来计算协方差矩阵,并使用矩阵扰动理论来求解协方差矩阵的特征值和特征向量。仿真试验表明该方法在确保计算精度的前提下,大大减少了运算时间。     

中国国防建设与经济建设协调发展程度研究

文章主要运用协调发展系数法对1980年～2003年中国国防建设与经济建设之间的协调发展程度进行了量化分析,结果表明,1998年～2003年中国国防建设与经济建设是协调发展的,但这只是一种低水平协调,今后的努力方向应是高水平协调发展。     

管道直饮水设计秒流量计算方法探讨

管道直饮水设计秒流量尚无统一的计算公式。目前 ,常用的三种计算方法———平方根法、不均匀系数法和概率法各有优缺点。根据管道直饮水的使用特点 ,本文指出了适合直饮水设计的秒流量计算公式和参数 ,计算结果可靠 ,方便易行。     

利用交互依赖活动集对C4ISR系统进行重组

一个复杂的C4ISR系统由若干子系统组成,子系统之间的交互依赖关系应该尽量少.利用活动模型构造系统的活动邻接矩阵,用图论中的路径矩阵来识别强连通子图,从而得出交互依赖活动集.具有交互依赖关系的活动尽量安排在一个子系统内部.利用这种方法来对C4ISR系统进行重组.     

新型吸波材料研究

本文是以SiC为基体的新型吸波材料的研究报告。通过几十个方案,100多个涂层试件的试验,在扩展频带方面采取了各种措施。有的试件使吸收10db以上的范围达到7GHz以上,20db以上的范围达1.4到1.5GHz.涂层厚度约2mm,比重小于4。     

武器系统研制费投资分布规律的仿真研究

针对大型项目多峰、复杂费用分布的传统仿真建模方法模型选取过于复杂、且难以达到精度要求等不足,提出将一种基于支持向量机的机器学习方法应用于大型复杂武器系统研制费投资分布研究.计算结果表明,这种方法有效弥补了传统建模方法的缺陷,有更好的泛化能力和实用性,因而可以作为研究此类问题的一种新方法.     

面向SPR的异构路由器聚合交换技术

互联网的快速发展使得传统的POP组网方式面临巨大的挑战,部署SPR(Single POP Router)路由器被认为是解决问题的有效手段。提出了异构路由器的聚合交换技术,可以将POP中的多个异构路由器以集群的方式实现一个规模更大的SPR路由器,具有降低组网成本、保护现有投资、简化网络管理、提高交换效率等优点。给出了聚合交换技术中需要重点研究的几个关键问题以及研究思路。     

Insurgency by the numbers I: A reconsideration of the ecology of communist success in jiangxi province,China

Theorizing about Taliban operations in Afghanistan has its limits and it is possible that Kabul-centric strategies do not adequately address the unique circumstances of each region in the country. How exactly has the Taliban gone about attaining its objectives in Kandahar province and how have those approaches evolved since 2002? And how have the Taliban adapted to coalition forces' attempts to compete with the insurgency and stamp it out? The answers to these questions are critical in the formulation of any counterinsurgency approach to Afghanistan.     

CHILDREN IN THE SPOTLIGHT

September 11 2001 has put the spotlight on terrorism, and it has been at the apex of the international security agenda ever since. Politicians, lawmakers, scholars and others have been debating the meaning and definition of terrorism for many years. Numerous myths and misconceptions persist on this highly debated issue. With the aid of historical case studies, this article aims to demonstrate how broad a concept terrorism has become. It focuses on its subjective and value-laden interpretation and hence the difficulty of arriving at a universally acceptable definition. The author introduces the concept of ‘colonial terror’, which depicts a distinct form of state terrorism perpetrated during the colonial and post-colonial periods. Like many before her, the author concludes that the definition and meaning of terrorism lie in the eye of the beholder.

There are two ways to approach the study of terrorism. One may adopt a literal approach, taking the topic seriously, or a propagandistic approach, construing the concept of terrorism as a weapon to be exploited in the service of some system of power. In each case it is clear how to proceed. Pursuing the literal approach, we begin by determining what constitutes terrorism. We then seek instances of the phenomenon—concentrating on major examples, if we are serious—and try to determine causes and remedies. The propagandistic approach dictates a different course. We begin with the thesis that terrorism is the responsibility of some officially designated enemy. We then designate terrorist acts as ‘terrorist’ just in the cases where they can be attributed (whether plausibly or not) to the required source; otherwise they are to be ignored, suppressed or termed ‘retaliation’ or ‘self-defence’. (Noam Chomsky)     

Book reviews

Over the last 18 years or so, much of the debate about modern warfare has been about whether it should be described as ‘old’ or ‘new’. However, there has not been a definitive answer as to which best reflects war in the modern world. Increasingly, the alternative arguments are polarised into opposing camps. Indeed, it would be fair to say that there is little in the way of debate at all. By revaluating the strengths and weaknesses of each argument, this paper aims to reinvigorate that discussion by examining whether changes in the way we understand war are really required. Finding that the ideas are not in fact mutually exclusive, it suggests that future research could benefit from a combined approach.     

矩阵开关技术在通用ATS电源模块自检中的应用

针对通用ATS中电源模块检查过程中存在检查时间长、劳动量大、工作效率低且易出错等问题,将矩阵开关技术引入通用ATS中电源模块的自检过程中,选取电压信号的均值和均方差作为评价电源模块性能的特征参数,并利用矩阵开关的多路复用功能设计了电源模块自检的拓扑结构,实现了自检过程中多通道的自动配置。仿真验证试验说明了该方法具有多通道自动配置、自检时间短、故障定位准确等优点。     

高维非线性电路平衡点稳定性研究

提出了一种新的分析具有分解形式的高维非线性电路平衡点全局渐近稳定的方法.这种方法以矩阵分解为工具,结合平衡点的渐近稳定判据,用分解矩阵的稳定性决定平衡点的全局渐近稳定性.与目前该问题所采用的LIYAPUNOV直接法相比,该方法具有无须判断平衡点的唯一性,判别方法直接明了等优点.电路维数越大时,此方法越有其优势.同时,该方法对于其他形式的非线性系统的分析,也有重要的启发性及应用价值.     

A stochastic gradual cover location problem

Covering models assume that a point is covered if it is within a certain distance from a facility and not covered beyond that distance. In gradual cover models it is assumed that a point is fully covered within a given distance from a facility, then cover gradually declines, and the point is not covered beyond a larger distance. Gradual cover models address the discontinuity in cover which may not be the correct approach in many situations. In the stochastic gradual cover model presented in this article it is assumed that the short and long distances employed in gradual cover models are random variables. This refinement of gradual cover models provides yet a more realistic depiction of actual behavior in many situations. The maximal cover model based on the new concept is analyzed and the single facility location cover problem in the plane is solved. Computational results illustrating the effectiveness of the solution procedures are presented. © 2010 Wiley Periodicals, Inc. Naval Research Logistics, 2010