A decomposition algorithm applied to planning the interdiction of stochastic networks

We describe the application of a decomposition based solution method to a class of network interdiction problems. The problem of maximizing the probability of sufficient disruption of the flow of information or goods in a network whose characteristics are not certain is shown to be solved effectively by applying a scenario decomposition method developed by Riis and Schultz [Comput Optim Appl 24 (2003), 267–287]. Computational results demonstrate the effectiveness of the algorithm and design decisions that result in speed improvements. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005.     

高速路由与交换技术现状及发展趋势

多个方向的可扩展特性是新一代互联网的重要特点,这对高性能路由器的性能、规模、功能和服务等能力提出了更高的要求,高速路由与交换技术是承载这种可扩展特性的关键技术。从网络处理器设计、路由查找技术以及高速交换技术三个方面总结了高速路由与交换技术的研究和发展现状,并展望了未来的发展趋势。     

Quantifying optimal mesh and ring design costs

During the last decade telecommunication operators have been deploying WDM (Wavelength Division Multiplexing) technology to satisfy the exponential growth in global communication. While facilitating the advanced information society of today, this has also led to a higher dependency on the networks, and furthermore the high capacity utilization of optical fibers means that a single link failure will influence many users and enterprises. For these reasons, protection of network connections has become a major competitive parameter for the operators. Currently, the most popular protection method is ring protection, due to its simplicity, requiring only basic management functionality and operating with local restoration control. While many optical rings have been deployed, little work has been published on exactly what the cost of ring networks are, compared to general mesh networks. In this article we perform a quantitative comparison between ring protection and mesh protection, using real world network data and realistic prices for network components. Extending classic LP flow models to take rings and node costs into account, and using a link‐path based mesh network LP model, we are able to perform a total cost comparison of the two architectures, and of manual ring network design. The results suggest that the price of mesh network components must be reduced significantly to be competitive with ring based networks, and also that manual network design does not necessarily lead to the most cost‐efficient designs. © 2004 Wiley Periodicals, Inc. Naval Research Logistics, 2005     

基于网络中心战背景的Lanchester导弹战斗模型

在对网络中心战进行简要介绍基础上,分析了信息网络与导弹作战效能发挥程度的关系。依据此关系,建立了具有网络中心战背景的Lanchester导弹战斗模型并对此模型进行了讨论。最后以海湾战争中美军导弹攻击策略对此模型进行了初步验证。结果表明该模型能较准确反映信息战体系对抗特点,具有较高可信度。     

时间观念的文化对比与跨文化交际

不同文化背景下,人们的时间观念不同。在跨文化交际过程中,由于时间观念的差异而导致的交际障碍和失误经常发生。文章对不同文化的时间观念进行了对比,并提出减少交际障碍的途径在于培养跨文化意识。     

基于神经网络的材料非稳态疲劳损伤可靠性研究

疲劳累积损伤是一个非稳态能耗过程,可以用遗传算法优化后的3层2 7 1BP神经网络来描述疲劳损伤的非线关系,经仿真验证表明,该神经网络具有较高的精度和泛化能力.通过对材料疲劳损伤临界值和载荷的分散性的分析研究,建立了疲劳失效动态准则,并运用蒙特卡罗随机抽样法对材料疲劳寿命的可靠性进行了仿真验证;对调质45号钢在随机载荷和2级载荷作用下,进行了疲劳寿命可靠性仿真计算,仿真结果与实验结果和理论分析比较吻合.     

基于PCA和BP神经网络的水下目标识别方法研究

针对被动声纳信号的特点,提出了基于信号线谱特征的主成分分析(PCA)特征选择方法,其优点是从复杂的目标信号中提取目标的特有信息,降低了目标特征维数.将此方法用于实录的三类水下目标数据,采用BP神经网络对目标进行识别分类,仿真结果说明了所提出的方法的正确性和有效性.     

BP神经网络在电子设备可靠性验证中的应用

讨论了借助MATLAB的BP神经网络解决电子设备在寿命分布未知和小样本试验数据时的可靠性评估方法, 并给出了一个应用实例, 该方法可以提高可靠性评估置信度, 并能节省试验时间和费用, 特别适用于大型复杂电子设备。     

编队对地攻击联合火力分配问题的Swt-opt算法

根据未来战争中编队对地攻击的特点,运用一致算法(consensus algorithm)的思想对Swt-opt算法进行改进,解决关于传感器-武器-目标的联合火力分配问题。改进算法继承了Swt-opt算法解决资源分配问题在通信、计算以及对战场态势的容错能力方面的优势,克服了Swt-opt算法受限于网络拓扑结构的缺点。最后,证明了改进算法的可行性,并运用Matlab对改进算法进行了仿真实现。     

一种面向节点定位的移动信标动态路径规划方法

针对基于移动信标的传感器节点定位问题,提出一种基于在线决策的移动信标动态路径规划方法.针对以往算法大都只适用于节点均匀分布的局限,该方法用移动信标不断获取两跳范围内的未定位节点数目,并向最大覆盖未定位节点方向移动,不需要网络先验信息,即可实现路径的优化.仿真结果表明:与传统方法相比,该方法无需网络的先验信息,在移动路径长度上具有明显优越性,减少了信标的能量消耗,更适用于户外部署的大规模传感器网络.