移动Ad Hoe网络路由协议的分析与比较

介绍AdHoc网络路由协议的设计难点和已经提出一些经典的路由算法,基于ns2网络仿真平台,在不同的应用场景下,对已经提出的三种经典的AdHoc网络路由协议AdHoe按需距离矢量(AODV)、动态源路由(DSR)、目的序列距离矢量(DSDV)的性能进行比较和分析,得出不同的路由协议在不同的应用场合有其各自的优缺点,按需路由协议更适合于AdHoc网络的结论.     

面向通信设备的网络协议构件化*

协议构件化是通信设备网络协议发展的一个趋势。把构件思想与网络协议相结合,给出了一个面向对象的基本框架MCS,以此提出基于构件的网络通信系统模型,并讨论了构件化协议栈的体系结构。同时以典型的TCP协议作为实例,说明了如何将单块式设计的协议转变成一个基于构件的协议。     

基于DSR的多路径路由协议的分析和改进

首先分析了DSR路由协议,然后提出了一种简单易实现的独立多径路由算法.该算法中只有目的节点应答路由请求,中间节点只转发一次路由请求,这样不仅减少了路由分组的数量,而且能为目的节点尽可能提供多条独立路径,减少了目的节点路由计算的复杂度.在NS-2环境下与DSR路由协议在路由开销、丢包率和端到端的平均延时方面进行了对比实验,实验结果表明SIMR算法的性能优于DSR路由协议.     

一种改进的Ad Hoc网络入侵检测agent设计

为了提高入侵检测系统的检测率,改进了一种基于功能代理的入侵检测系统的检测agent,以DSR路由协议为基础,根据规范检测相关行为的正确性,建立相应模型并通过实验说明结果。     

Multipath Source Self Repair Routing Algorithm for Mobile Ad Hoc Networks

A multipath source self repair routing (MSSRR) algorithm for mobile ad hoc networks is proposed.By using multiple paths which can be repaired by themselves to transmit packets alternately, the network‘s load is balanced, the link state in the network can be checked in time, the number of the times the route discovery mechanism starts is decreased. If only one route which will be broken can be used to transmit the packets, the route discovery mechanism is restarted. The algorithm is implemented on the basis of dynamic source routing (DSR). The effect of MSSRR on lifetime of the access from the source to the destination and the overhead is discussed. Compared with the performance of DSR, it can be seen that the algorithm can improve the performance of the network obviously and the overhead almost does not increase if the average hop count is larger.     

DSR协议下数据包攻击及防御机制

移动Ad—hoc网络又称移动自组网、多跳网络,是一种特殊的、在不借助中心管理的情况下,在有限的范围内实现多个移动终端临时互联的网络。由于Adhoc网络自身的特殊性,其路由协议的设计与传统固定网络有很大不同,而且种类繁多,DSR协议便是其中一种。DSR协议也被称做动态源路由协议,它作为Ad—hoc网络的路由协议之一,最大特点是在发送的每个数据包中放入一个完整的、按序排列的路由信息,并且在传递数据包的过程中依赖着这些路由信息去完成工作。文章主要介绍了Ad—hoc网络中的DSR协议的工作方式,针对其安全性提出一种新的攻击模型——数据包攻击,并通过模拟实验,给出了数据包攻击的检测方法和防御策略,能够成功地发现并有效地阻碍数据包攻击。     

Using a new protocol to enhance path reliability and realize load balancing in mobile ad hoc networks

In this paper we introduce a novel end-to-end approach for achieving the dual goal of enhanced reliability under path failures, and multi-path load balancing in mobile ad hoc networks (MANETs). These goals are achieved by fully exploiting the presence of multiple paths in mobile ad hoc networks in order to jointly attack the problems of frequent route failures and load balancing. More specifically, we built a disjoint-path identification mechanism for maintaining multiple routes between two endpoints on top of the Stream Control Transmission Protocol (SCTP), and the Dynamic Source Routing (DSR) protocol. A number of additional modifications are incorporated to the SCTP protocol in order to allow its smooth operation. The proposed approach differs from previously related work since it consists of an entirely end-to-end scheme built on top of a transport layer protocol. We provide both analytical and simulation results that prove the efficiency of our approach over a wide range of mobility scenarios.     

Synthesis and evaluation of high-temperature properties of butylated graphene oxide composite incorporated SBS (C4H9-GO/SBS)-modified asphalt

Graphene nanoparticles (GNPs) added styrene-butadiene-styrene (SBS)-modified asphalt suffers from serious compatibility and agglomeration problems. To tackle these problems, in this study, graphene oxide (GO) was mixed with bromobutane to synthesize butylated graphene oxide (C₄H₉-GO) composite, which was in turn compounded with SBS for the preparation of C₄H₉-GO/SBS-modified asphalt. C₄H₉-GO/SBS-1.0-modified asphalt exhibited the best performance in terms of 11.4% increased softening point, 19.3% increased ductility, and 10.2% reduction in penetration as compared to 5% SBS-modified asphalt. Dynamic shear rheometer and multistress creep recovery tests showed that at 1.0% C₄H₉-GO contents, C₄H₉-GO/SBS composite-modified asphalt exhibited the best high-temperature performance and low stress sensitivity. Microscopic characterization of C₄H₉-GO via Fourier transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy revealed successful bonding between  C₄H₉ and GO, increasing interlayer spacing in GO. Atomic force microscopy and scanning electron microscopy analysis showed the superior elasticity of C₄H₉-GO than GNPs. Differential scanning calorimetry analysis indicated that C₄H₉-GO sheets can be stabilized by SBS through π–π stacking with the polystyrene chains. This study awarded to the preparation of novel C₄H₉-GO/SBS-modified asphalt with superior mechanical property can be deemed of potential value and applications in construction and highway industries. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 48231.     

短波Ad Hoc路由协议仿真与性能分析

为找到一种适合短波Ad hoc网络使用的路由协议,通过OPNET仿真软件对短波信道进行建模,在该模型的基础上对无线Ad Hoc常用的3种路由协议:优化链路状态路由(Optimized Link State Routing,OLSR)、反应式路由中的动态源路由(Dynamic Source Routing,DSR)和按需距离矢量(Ad hoc On Demand Distance Vector,AODV)进行仿真分析。仿真结果表明,OLSR路由协议网络时延最小、吞吐量最高和数据丢失率最低,其整体性能优于AODV及DSR路由协议,更适合于短波信道,但是OLSR路由协议也存在着开销高的不足,下一步可以针对降低路由开销进行研究。     

Ad Hoc中的常用路由算法分析

在传统的移动无线Internet接入方式中，通常是以宽带有线接入网为支撑。无线用户只通过一跳(不需要在无线网中多次转接)就可以接入固定网络。在很多应用场合，如个人区域网、家域网、军事应用、抢险救灾等，无线网络没有固定的基础设施作支撑，移动用户的信息需要通过移动用户之间的多次中转才能到达目的用户，这种网络通常称为分布式或无中心式(Ad hoc)网络。本文首先介绍了Ad Hoc网络。然后介绍了目前运用于Ad Hoc网络中的几种路由算法，并指出其优缺点。