网间安全隔离技术分析研究

随着互联网的普及和电子政务在日常工作、学习和生活的普遍使用,网络信息安全的重要性愈发引人关注,保证网络信息的安全已成为推进社会网络化的重点,网络隔离技术也成为了网络安全技术发展的一个关注点。文中系统地分析了现有的网络隔离技术现状及不足,并提出一种新的基于可信计算技术的网间安全隔离方案。与传统的方案相比,新方案不仅更加简洁、灵活,同时较大提高了系统的安全性。     

基于定向天线的移动自组网路由协议研究

同等功耗下,定向天线能够产生更高的增益,提供更大的传输范围,提高网络的空间复用度和吞吐量,天线选择的方向性又降低了邻近结点之间的相互干扰,采用定向天线能够给移动自组网带来潜在性能的提高。对基于定向天线的移动自组网路由协议进行研究,简单介绍了定向天线,总结了引入定向天线产生的路由问题,对现有的一些典型定向路由协议进行了分类、介绍和比较,最后对引入定向天线带来的好处进行了分析。     

基于认知的无线传感器网络抗干扰路由算法

针对无线传感器网络受Wi—Fi等异构系统干扰日益严重的问题,在引入基于簇的动态多信道组网策略的基础上,综合考虑频谱受干扰程度、信道切换代价、节点剩余能量等因素,提出了一种认知频谱干扰的能量有效的路由（CSIEE）算法。仿真结果表明,该路由与EEPA,AODV,AODV—EA路由相比,有效地节约了传感器节点能量,延长了网络生命周期。     

Research of novel complex optical network routing architecture

This article puts forward a novel routing architecture for complex optical network,which core component is path calculation element(PCE).As is well known,the PCE-based distributed path computation structure is making the routing control and computation loosely coupled from traditional control plane.In the study,the resource allocation and routing algorithm are the critical part of PCE hierarchy.To compare the performance of new architecture and the traditional one,the user uses the flooding suppression,routing delay,resource utilization and traffic blocking probability as performance simulation parameters and taking the verification simulation on objective modular network testbed(OMNeT)platform against to source-node routing architecture.The numerical analysis,computer simulation and experiment work indicate that the operation of PCE-based routing architecture can reduce the flooding information of path calculation request as well as the routing hops significantly and improve the quality of service(QoS)by decreasing the blocking probability when failure happened.     

AODV routing overhead analysis based on link failure probability in MANET

This article puts forward an Ad-hoc on-demand distance vector routing(AODV)routing overhead analysis method in mobile Ad-hoc network(MANET).Although multiple routing protocols have been proposed to improve the performance,scarcely any paper analyzed the routing overhead caused by routing setup and maintenance processes in mathematical way.Routing overhead consumes part of network resources and limits the supported traffic in the network.For on-demand routing protocols like AODV,the routing overhead depends on the link failure probability to a great extent.This article analyzes the collision probability caused by hidden-node problem and the impact on link failure probability.In chain and rectangle scenarios,it presents a mathematical analysis of the theoretical routing overhead of AODV protocol based on link failure probability.Simulations on OPNET 14.5platform match well with the theoretical derivation which confirms the effectiveness of the analysis method.     

Load balancing routing for single-layered satellite networks

The varying population density leads to imbalanced utilization rate of satellites. To ensure an intelligent engineering of traffic over satellite networks, a distributed routing scheme for single-layered satellite network, load balancing routing protocol based on mobile agent (LBRP-MA) is proposed. For LBRP-MA, mobile agents explore route by migrating autonomously. Upon arriving at destination, mobile agents migrate back. On each intermediate satellite, mobile agents evaluate path cost considering satellite geographical position as well as inter-satellite link (ISL) cost, and finally take ISL congestion index into account to update routing tables. Through simulations on the Courier-like constellation, the proposed approach is shown to achieve guaranteed end-to-end delay bound and decrease packet loss ratio with better throughput, which is especially suitable for data transferring in case of high traffic load. Moreover, results of the complexity analysis demonstrate that LBRP-MA can have low onboard signaling, storage and computation requirements. Furthermore, issues of LBRP-MA such as ISL congestion index and cost modification factor are discussed.     

Chord双向查找算法研究

Chord算法是一种典型的结构化P2P搜索算法,该算法简洁而且拓扑结构清晰,但该算法还存在着路由表信息冗余,查找效率不高的问题。在分析经典Chord算法的基础上,通过扩展Chord路由表,提出一种新的查找算法,该算法能够消除路由表的一些冗余信息,减少查找次数。通过理论分析,该算法提高了Chord的查找效率。     

无线自组网技术应用

针对Ad Hoc网络良好的灵活性和健壮性在介绍其基本结构和特点的基础上,说明了Ad Hoc网络的技术难点、解决方法并展望了发展前景。     

认知无线电网络路由研究综述

 在对近期认知无线电网络路由研究成果进行研究的基础上,从邻居节点发现、“耳聋”、邻居节点消失、路由发现和跨层设计等5个方面,对认知无线电网络路由研究面临的重要挑战进行了分析;从研究方法的角度,对路由研究中对公共控制信道的依赖、路径延时,以及需要考虑的技术指标进行了讨论。最后,从介质、信道、节点和网络等4个方面,对路由研究场景设计进行了归纳总结;并从路由优化方案和路由拓扑算法协议两个方面,对主要研究成果进行了分析和讨论。     

基于可信敏感度的网格信任协商策略及其应用分析

本文将证书敏感度和实体声誉相结合,提出基于可信敏感度的信任协商策略来避免敏感信息的披露;引入协商第三方来解决循环依赖策略,提高服务成功率.最后分析了策略的计算和通信开销,在NUPT网格平台的测试结果证实了该策略性能令人满意.