The quickly switching routing algorithm based on multi-path in mobile Ad Hoc networks

1Introduction Thenavyandcommerceareallconcentratingtheiref fortstoresearchformobileAdHocnetworks,including itsstructure,networktopology,protocols.Modernma rinejustdependsonresearchingonwirelessmobileAd Hocnetworkstokeeptechnicallyadvanced.Commer cialappli…     

地理路由算法在Duty-Cycle网络中的研究

文章提出了Duty-Cycle网络中的地理路由算法MMGR（多度量地理路由）。这个算法所考虑的度量因素不仅包括传统地理路由中提到的地理距离,也包括候选节点睡眠延迟的Duty-Cycle。经仿真表明,在Duty-Cycle网络中,这种新的算法在端到端的延迟方面比传统的GR（地理路由）算法有更好的效果。     

无线自组织网备份路由协议研究

传输带宽的增大使无线adhoc网络的多媒体应用日趋增多。根据多媒体应用对数据时延敏感的特点，分析无线adhoc网络动态源路由协议的优缺点，针对无线adhoc网络拓扑动态变化所带来的路由频繁中断的问题，提出基于动态源路由协议的备份路由动态源路由协议-B-DSR（Backup route DSR），并在NS2网络仿真平台上实现该协议的算法，通过与原DSR协议的比较，验证该协议算法的可行性。     

移动自组网跨层设计：方法与难点

首先分析了跨层设计提出的背景,然后对文献中的跨层设计建议进行了分类,分为无线TCP的跨层设计、基于网络层的跨层设计和以链路层为核心的跨层设计三类,并综述了每一类的典型协议和算法。接着介绍了一个跨层设计框架,分析了其设计思路和实现方式。进而总结了跨层设计面临的难点,包括跨层设计理论研究、性能和代价的权衡、跨层设计建议的共存问题和三层以上跨层设计四个方面。     

一种新型的船舶横摇运动实时预报方法

本文在阐述强化学习的基本原理，方法的基础上，提出了一种强化学习的TD算法与BP算法相结合的BPTD方法，并将基用于对角回归神经网络的在线训练，最后以在船舶横摇运动时预报技术上的应用为例，说明这种算法有很强的实时多步预报能力。     

舰艇编队无线自组网建模分析研究

路由协议是自组网的关键技术.路由协议的设计和性能评估都要涉及到一些基本的网络参数.本文结合舰艇编队无线通信网络实际,对编队无线自组网进行了合理假设,运用马氏链建模的方法对这一问题进行了研究,推导了任意节点相邻概率和邻居数的计算公式,实现了路由协议性能研究中涉及到的一些基本网络参数的定量处理.最后结合海军战斗群的典型应用进行了实例计算.文章基于马氏链建模所得到的结论,为军用无线自组网的理论分析提供了依据,对编队无线自组网的工程实践具有一定的指导意义.     

一种改进的自组网动态信道分配协议

文章针对节点具有双收发器多信道的自组网,对动态分配协议进行了改进,使得一些短报文可以在没有可用数据信道时直接在控制信道上传输,从而解决信道利用率不高的问题。研究表明,改进后协议的网络吞吐量有了显著的提高。     

复线布置桥梁桥区水域船舶通航效率研究*

为研究复线布置桥梁桥区水域的通航效率,将其考虑为一个串联排队系统进行数学建模与计算机模拟。以苏通大桥与沪通大桥的桥区水域为例,计算日常与高峰两个时段桥区水域通航系统的效率。将单桥通航系统视为M/M/1型排队系统计算其通航效率,并进行两种通航系统的对比分析,找到复线布置桥梁桥区水域通航效率的两种瓶颈与瓶颈产生的机理,为复线布置桥梁的桥位选址和营运期的交通组织提出相关建议。     

Link16数据链网络同步的改进算法

现有的Link16数据链网络同步算法选取一个终端作为时间基准（NTR）,其他非NTR终端通过收发往返计时报文（RTT）来获取系统时间并保持同步。这种方式的抗毁性较差,例如对NTR终端同步的干扰就可以使得整个Link16数据链网络瘫痪。针对这一弊端,本文提出了一种使用每个Link16数据链终端互相校准的互同步算法,该算法提高了Link16数据链网络的抗干扰性,并且在数学上证明了算法有很好的收敛性。     

无线通信网络IP化改造研究

随着作战方式向网络中心战模式演进,必然要求各型军用通信网统一接口,向IP化方向发展。文章介绍了某型无线通信网络IP化改造的技术方案,并讨论了其中涉及的虚拟网卡设计和RIP路由实现等关键技术,对类似网络的改造有一定借鉴意义。     

链路分离路径算法研究

传统的QoS路由算法只在源节点和目的节点之间提供一条QoS路径,这一做法已不能满足在网络连接出现故障时保持业务持续不间断地进行这一要求.分离路径算法试图在源节点和目的节点之间寻找满足一定QoS约束的分离路径（链路分离或节点分离）,一条主用路径,另一条备用路径.当主用路径出现故障时,将其承载的业务流转换到备用路径上,从而实现快速的业务恢复.因此,分离路径算法研究有很重要的实用价值.     

Ad Hoc网络会话密钥协商算法研究

密钥协商是构建Adhoc安全网络系统需解决的关键问题之一。针对Adhoc网络的特点,提出了一种基于Chebyshev（2P）多项式的会话密钥协商算法,利用Chebyshev（2P）单项陷门函数来构建用于Adhoc网络保密通信的会话密钥。经分析表明：该算法具有较高的安全性,在P取值较大时,该算法的性能要优于ECDH算法,适合于资源受限、拓扑结构动态变化的Adhoe网络。     

自组网无线动态应变检测节点设计

本文设计了高精度自组网无线动态应变采集电路。设计采用TI公司的ZIGBEE解决方案进行无线自组网网络建立,采用恒流式电桥提高传感器的抗干扰能力和精度,并进行ADC驱动电路的分析设计,并进行现场实验。实验表明该方案具有较好的环境适应性、可维护性并具有优异的采集精度,可以满足大型复杂结构的分布式疲劳测试。     

基于Intergraph Smart 3D的邮轮电缆自动敷设功能优化开发

Intergraph Smart 3D软件的电缆敷设功能在化工电力行业应用较为广泛,考虑到邮轮电气生产设计中的电缆具有长度长(3 000 km～5 000 km)、种类多、通道网络复杂和分段敷设的特点,直接应用Smart 3D原生的电缆敷设功能进行电缆敷设存在较大的风险。从邮轮电缆敷设需求出发,对Smart 3D原生电缆敷设解决方案进行优化,充分考虑电气设计人员的使用习惯,基于贪心算法和单源最短路径算法(Dijkstra算法)优化算法解决断续托架的电缆敷设和电缆分区敷设最优路径选取的问题,提高电气设计人员的电缆敷设效率。     

A combined tramp ship routing,fleet deployment,and network design problem

In this paper, a tramp ship routing model of fleet deployment in a hub-and-spoke network is presented. This model simultaneously determines the selection of hubs, the assignment of spokes to hubs, the deployment of feeder-containerships as well as containership routing between spokes and spokes, hubs and spokes, and hubs and hubs. Even though some parts have been studied, this complex combination of shipping problems has never been addressed. Because the problem is NP-hard, a genetic algorithm (GA) with local search is proposed. In the algorithm, a cut-off procedure is applied to fleet deployment in a sub-route strategy. A number of randomly generated problem instances are solved by both a mathematical program and the GA with local search. A simple but realistic heuristic algorithm is also developed. Both the GA with local search and the heuristic algorithm are used to solve a number of real case instances. A comparison of the results shows the efficiency of the GA with local search. The developed model can be used as a route-decision support tool for shipping companies that provide long-haul shipping services in a hub-and-spoke network.     

无线传感器网络安全路由协议SNEP的分析与仿真实现

以提供可靠保密通信为目标的安全路由协议的分析是无线传感器网络安全基本研究领域之一．阐述了针对无线传感器网络的攻击手段所采取的措施,研究了安全路由协议,重点研究了其中的传感网络加密协议（Sensor Network Encryption Protocol,SNEP）,并进行了仿真实现,最后针对无线传感网络的攻击方式对SNEP的安全性进行了分析．结果证明SNEP协议具有数据机密性、数据认证、防御重放攻击等安全服务．     

基于NS2仿真的Ad hoc网络AODV路由协议性能研究

Ad hoc移动网络是一种无任何有线基础设施的多跳、临时性自治系统。在进行Ad hoc各种仿真过程中,都需要设定一定的场景和节点数目,合理设置两者之间的关系对于仿真结果的好坏起着重要的作用。文章使用NS2仿真常见的Ad hoc网络设定场景,从数据正确接收率、端到端平均时延和路由开销三方面对比分析出最优的节点设置数目。最后提出了一种性能综合判定方法,对仿真结果表明：在场景1000 m×800 m的环境,设置节点在35左右为最佳,在此基础上,研究通信时发送节点为10左右网络性能最优。     

Application of El Farol model for managing marine terminal gate congestion

Truck queuing at marine terminal gates has long been recognized as a source of emissions problem due to the large number of trucks idling. For this reason, there is a great deal of interest among the different stakeholders to lessen the severity of the problem. An approach being experimented by some terminals to reduce truck queuing at the terminal is to provide live views of their gates via webcams. An assumption made by the terminals in this method is that truck dispatchers and drivers will make rational decisions regarding their departure times such that there will be less fluctuations in truck arrivals at the terminal based on the live information. However, it is clear that if dispatchers send trucks to the terminal whenever the truck queues are short and not send trucks when the truck queues are long, it could lead to a perpetual whip lash effect. This study explores the predictive strategies that need to be made by the various dispatchers to achieve the desired effects (i.e. steady arrival of trucks and hence less queuing at the seaport terminal gates). This problem is studied with the use of an agent-based simulation model and the solution to the well known El Farol Bar problem. Results demonstrate that truck depots can manage (without any collaboration with one another) to minimize congestion at seaport terminal gates by using the provided real-time gate congestion information and some simple logics for estimating the expected truck wait time.     

基于QualNet的一种战场自组织网络的设计与仿真

为研究Ad Hoc（自组织网络）在战场上的实现和应用,衡量其网络性能,验证战技指标是否满足实际通信要求,结合战场环境特点设计了自组织网络层次模型,并利用Qual Net实现了模拟仿真,得到了端到端时延,网络吞吐量,成功接收分组率等总体网络性能参数。     

A two-phase tabu search approach to scheduling optimization in container terminals

An optimization model for scheduling of quay cranes （QCs） and yard trailers was proposed to improve the overall efficiency of container terminals. To implement this model, a two-phase tabu search algorithm was designed. In the QCs scheduling phase of the algorithm, a search was performed to determine a good QC unloading operation order. For each QC unloading operation order generated during the QC＇s scheduling phase, another search was run to obtain a good yard trailer routing for the given QC＇s unloading order. Using this information, the time required for the operation was estimated, then the time of return to availability of the units was fed back to the QC scheduler. Numerical tests show that the two-phase Tabu Search algorithm searches the solution space efficiently, decreases the empty distance yard trailers must travel, decreases the number of trailers needed, and thereby reduces time and costs and improves the integration and reliability of container terminal operation systems.