基于网络编码的多径路由策略

针对无线传感器网络节点能量受限制的特点,提出基于网络编码的多径路由策略.该策略在数据传输过程当中通过增加跨层协作机制,减少对单个数据包的依赖,降低数据包重传次数,使得网络带宽得到优化,同时数据在传输路径中进行随机编码使得数据包安全传输.分析表明,该策略可以保证数据传输的有效性和安全性.     

A geographic routing protocol based on trunk line in VANETs

A Trunk Line Based Geographic Routing(TLBGR) protocol in Vehicular Ad-hoc Networks (VANETs) is proposed in this paper to solve the problem of data acquisition in the traditional trunk coordinated control system. Because of the characteristics of short communication time and high packet loss among vehicles, the vehicles entering the trunk lines can not transmit their information to the trunk coordinated control system stably. To resolve this problem, the proposed protocol uses the trunk lines’ traffic flow and the surrounding road network to provide a real-time data transmission routing scheme. It takes into account the data congestion problem caused by the large traffic flow of the main roads, which leads to the corresponding increase of the information flow of the section and the package loss, and the link partition problem caused by the insufficient traffic flow, which makes the vehicles have to carry and relay information thus increasing the transmission delay. The proposed TLBGR protocol can be divided into two stages: the next-intersection selection, and the next-hop selection in the chosen path between the current and next intersections. Simulation results show that, compared with other IoT routing protocols including Greedy Perimeter Stateless Routing (GPSR), Ad-hoc On Demand Vector (AODV), and Q-AODV, the TLBGR protocol has better performance in aspects of end-to-end delay, delivery rate, and routing cost under the scenario of urban traffic trunk lines. The TLBGR protocol can effectively avoid data congestion and local optimum problems, increase the delivery rate of data packets, and is therefore suitable for the routing requirements in this application scenario.     

基于物联网的智能节水灌溉控制网络设计

为提高灌溉用水的利用率和设备智能化程度,提出了一种基于无线传感器网络的智能节水控制系统。重点分析了应用于传感器网络中的路由协议,并实现了算法设计,将各传感器构成智能化传感器网络,同时引入太阳能供电电池,从而全面提升系统的自动化和智能化水平。采用网络仿真的方法对所提算法进行验证。仿真结果表明,该控制网络可显著改善灌溉的准确度,提高灌溉用水的利用效率。     

基于子节点编码和声搜索的QoS组播路由算法

传统启发式方法求解QoS组播路由问题复杂度高,收敛速率慢,无法满足实际需求。该文提出一种基于子节点编码的和声搜索算法以解决该问题。在和声搜索算法的基础上,该算法设计了新的初始解及新解生成方式,提升了算法执行效率;提出了参数动态调整方案,兼顾了全局搜索以及局部搜索能力;同时设计了一种基于子节点的组播树编码方式,加快了新解生成过程。通过理论分析仿真实验,证明了该文算法的低复杂度,表明该文算法在收敛速率和代价方面具有明显优势。     

移动自组网典型路由协议研究

随着网络的发展,移动自组网已成为当前研究的热点,文中介绍了移动自组网与现有通信系统在路由上的区别,重点探讨了移动自组网DSDV、AODV、DSR等几类典型的路由协议,以及MANET路由协议今后的主要研究方向。     

Providing reliable and link stability‐based geocasting model in underwater environment

This paper presents a geocast technique for underwater sensor networks. The model named as Routing and Multicast Tree based Geocasting (RMTG) (TRACE'10, Bhopal, India, 2010; ICWET'10, Mumbai, India, 2010) has been designed for underwater sensor networks. In our previous work (TRACE'10, Bhopal, India, 2010; ICWET'10, Mumbai, India, 2010) we proposed only a theoretical model for underwater geocasting. The RMTG technique uses greedy forwarding and previous hop handshaking to route the packets towards the geocast region and further disseminates the data within the geocast region by creating a multicast shortest path tree. We also presented various link broken scenarios along with their solutions. The proposed model does not use the flooding technique to deliver the packets inside the geocast region that is used in most of the geocasting techniques. In this paper, we present the simulated RMTG model. The simulation results show that the proposed model provides an efficient distribution of data in the geocast region in terms of node mobility handling, packet delivery ratio and a better end‐to‐end latency. Most of the work on geocasting has been done for mobile and vehicular ad hoc networks; hence we present in this paper a novel simulated model for underwater environment. Copyright © 2011 John Wiley & Sons, Ltd.     

面向智慧园区的WSN路由优化算法

为解决智慧园区中无线传感器网络(WSN)的能耗不均衡问题,构建了路由代价函数,并提出了一种新的能耗均衡路由算法.该算法结合智慧园区中无线传感器网络的特点,综合考虑节点地理位置和剩余能量来构建路由代价函数.传感器节点通过选择其邻居节点中路由代价最小的节点进行数据转发.仿真结果表明,该算法可以有效节约网络能耗,同时延长了网络的生命周期.     

一种多约束服务质量路由算法

下一代网络服务质量要求解决多约束服务质量路由问题.在分析了服务质量路由特点及相关工作的基础上,提出服务质量路由新计算方法.方法基于路径计算,首先计算最少跳路径,然后利用非线性花费函数进行求解并判断约束路径,最后求出优化多约束路径.通过对网络拓扑状态仿真结果表明,该算法能快速求解在多约束条件下优化路径,约束参数扩展性好.     

蓄滞洪区洪水演进模拟

系统地研究了描述洪水在蓄滞洪区内演进过程的一不恒定流模型和二维流模型，突出对河流与沿河堤外洼地间水流交换的描述和对淹没区各蓄水单元间水流交换的描述及河流与调蓄区水流连接的描述，最后简要介绍了实例。     

追踪洋葱包的高级标记方案与实现

洋葱路由技术是实现信息隐藏而提出的一种新的匿名连接技术，使攻击者既不能进行窃听，也不能实施流量分析。然而攻击者一旦利用此技术进行拒绝服务式攻击，受害者无法追踏出攻击者。为此本文提出一种可追踪洋葱数据包的高级标记方案，使洋葱路由技术在保持原有隐匿性的同时受害者还可以近似地追踪出攻击者，本方案有很低的网络和路由器开销，也容易扩充到IPV6和未来的主干网。