一种基于移动代理的MANET IDS模型

文章分析了MANET的特点以及它对入侵检测系统(IDS)的要求,提出了一种MANET的IDS模型。在该模型中引入了智能移动代理技术从而增强了模型的分布性和智能性;将MIB信息也作为审核数据的来源从而丰富了检测手段;采用了既有独立检测也有协动检测和联动检测的混合防护模型,从而增强了模型的灵活性和适应性。     

基于智能感知网的上下文感知应用研究

针对普适计算环境下人们获取智能化信息服务的需求,提出一种基于传感器网络和智能代理技术的上下文感知应用模型,实现了相应的媒体播放原型系统。系统由控制终端、媒体播放终端及超声波传感器组成,支持有线／无线传输方式。采用超声波测距方法和代理技术,媒体播放管理以Eclipse为开发平台,实现目标监测、定位及自适应媒体播放。该系统性能可靠,具有较高应用价值。     

基于CC2431的无线传感器网络节点的设计

CC2431是Chipcon公司新推出的符合Zigbee标准并具有定位功能的无线射频芯片,设计该节点可以为无线传感器网络提供较高质量的硬件定位功能.在简要介绍无线传感器网络及其节点的特征后,详细介绍了CC2431的性能及特征,并结合CC2431的外部接口及电气特性,利用模块化的设计方法定制节点中的各个功能模块,最终实现了集处理器8051与通信模块于一体的基于CC2431的无线传感器网络节点.     

Automatic Traffic Balance Algorithm Based on Traffic Engineering

Routing protocols can decide for data packets which route is reachable and co-optimal, and may cause data packets to swarm into certain links, thus causing congestion on those links. General traffic engineering (GTE) technology provides ER-LSP/CR-LSP in MPLS networks to avoid this kind of congestion. However, GTE takes only the current data flow into account and establishes an ER-LSP/CR-LSP for this current data flow in order to guarantee QoS. Although this could resolve the issue raised by routing protocols, it may also waste some resource. In this article we focus on optimization of traffic engineering and propose an automatic traffic balance algorithm based on GTE technology. Dengyin Zhang received the BS, MS, and PhD degrees from Nanjing University of Posts & Telecommunications, China, in 1986, 1989, and 2004, respectively. He is presently an associate professor at Nanjing University of Posts & Telecommunications. His research interests include computer networks, communication systems, signal and information processing. Zhiyun Tang received the MS degree in computer science and technology from Nanjing University of Posts & Telecommunications, China, in 2005. His research interests include MPLS technology, QoS control and resource management in wired and wireless networks. Ruchuan Wang born in 1943, he is a professor in College of Computer at Nanjing University of Posts and Telecommunications. He advises doctorial graduate students majoring in Computer Software, Computer Network, E-Commence and Network Security and Mobile Agents.     

网络主动攻击技术研究与实现

论文首先对当前该领域的发展趋势进行分析,接着从网络攻击层次、网络攻击手段、网络攻击对象和网络攻击步骤四个方面对网络主动攻击技术进行了分析研究,最后提出了“网络主动攻击系统”的系统功能与目标、系统模型以及功能模块组成。     

Node Localization Based on Improved PSO and Mobile Nodes for Environmental Monitoring WSNs

In this paper, a novel iterative localization algorithm based on improved particle swarm optimization (PSO) is proposed for monitoring environment like lakes, rivers or other water bodies. The first step of this algorithm is to get the position of some unknown nodes by using improved PSO algorithm. The second step is to locate other nodes by using these unknown nodes in first step as new anchor nodes. The localization problem of island node in sparse distributed grid is solved by introducing adaptive mobile node in this paper. The simulation results show that the algorithm has the advantages of small location error and little influence by environmental factors.     

基于空间关系特征的未知恶意代码自动检测技术研究

提出基于未知恶意代码样本空间关系特征的自动检测技术.针对量化的恶意代码样本字符空间的向量特征,基于区域生长的智能分块算法,划分恶意代码样本空间关系区域;根据区域分别计算恶意代码样本的字符矩、信息熵和相关系数等空间关系特征,分别提取特征向量,并归一化处理;通过分析恶意代码样本特征的共性,建立空间关系特征向量索引;采用综合多特征的相似优先匹配方法检测未知恶意代码,多个空间关系距离加权作为判别依据,提高检测的准确率.实验表明,提出的自动检测方法能够自动快速地匹配出未知恶意代码的样本,准确程度高,而且能够确定未知恶意代码的类型.     

基于WEB平台的分布式网络管理模型的研究与实现

当前网络管理在向基于Web平台和分布式的方向发展,文章首先分析了传统的基于集中式和轮询技术的网络管理系统结构已经不适应计算机网络本身的发展变化,然后提出了一个基于WEB平台的新型分布式网络管理模型,给出了该模型的层次模型和系统结构,然后讨论了这个系统模型的几个关键技术的实现,最后利用该模型搭建了一个分布式网络管理平台并对其进行了描述。     

无线传感器网络中一种能量有效的数据存储方法

如何有效地对传感器在过去历史时间段内采集的大量感知数据进行存储,以备将来的信息查询和数据分析已经成为无线传感器网络应用面临的一个难题.介绍了一种基于树型路由的分布式数据存储方法,通过采用动态规划方法选择存储节点,使存储节点能量均衡和所有节点能耗之和最小,从而达到整个无线传感器网络能量有效.仿真实验结果表明,这种数据存储方法能够获得较好的能量均衡和总能耗较小,从而有效地延长整个无线传感器网络的生命周期.     

An efficient preconditioning technique for numerical simulation of hydrodynamic model semiconductor devices

We investigate the application of preconditioned generalized minimal residual (GMRES) algorithm to the equations of hydrodynamic model of semiconductor devices. An introduction to such a model is presented. We use finite‐element method P₁‐isoP₂ element to discretize the equations. A preconditioning technique is proposed. The CPU times are presented for n⁺‐n‐n⁺ diodes and 0.25 μm gate length Si MESFETs by using the preconditioned GMRES algorithm and the GMRES algorithm. The numerical results show that the preconditioning technique accelerates effectively the velocity of convergence. Copyright © 2003 John Wiley & Sons, Ltd.