共查询到19条相似文献,搜索用时 109 毫秒
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网络对时技术及应用方向研究 总被引:1,自引:0,他引:1
根据目前Internet上使用的网络时间服务器对时方法,分析了网络时间服务器利用NTP协议对时原理、计算方法,并以此为原型,探讨未来舰艇及编队网络时间服务的对时技术及实现方法,为舰艇作战系统时统设备的未来发展提供参考。 相似文献
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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. 相似文献
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信息战条件下水面舰艇编队通信网络技术发展与分析 总被引:1,自引:1,他引:0
本文分析了信息战条件下,水面舰艇及编队通信能力的需求,我国水面舰艇通信系统发展现状及弱点,提出了水面舰艇编队通信网络技术发展思路、方案构想,给出了水面舰艇通信系统配置示意图。 相似文献
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战术栅格通信网络必须首先保证重要数据能够安全、准确、平稳地传输,其网络通信需要高效可靠的通信体系架构,而海战场的通信环境十分复杂,论文以提高舰艇内和大型舰艇编队节点间通信的可靠性以及业务服务质量(QoS)的可保障能力,降低通信延迟,提高网络带宽为目的,通过研究海上战术栅格无线通信网中网络层AODV协议与链路层Spatial-TDMA数据服务质量保障技术及数据传输结构和涉及的相关关键技术,研究基于跨层协议的战术栅格无线网络系统数据处理流程,构建跨层的战术栅格通信网络架构,为新时期海军航母编队作战群执行多样化作战任务时提供可靠、高效的网络通信保障。 相似文献
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由于舰艇编队网络面向战略任务的特殊性,即使出现短时失效的问题,也会给造成无法估计的损失。论文把免疫遗传思想引入到舰艇编队网络的故障诊断中进行网络故障的定位,通过分析故障诊断的目标函数把故障诊断问题转化为成二分图问题,其求解转换成0-1规划的求解问题。进而提出基于免疫遗传算法的故障定位方法。仿真结果表明,论文所设计的方案定位简单,效率高,具有可行性。 相似文献
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本文在预测了本世纪本我国铁矿石进口的基础上构筑了其海运网络。运用网络流模糊规划方法按最大最小费用流问题对矿石货流进行了合理安排。 相似文献
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分析编队通信网频率规划的方法以及频率规划所涉及的电磁兼容分析模型,研究模型化分析方法和基于模型分析的仿真过程。 相似文献
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Jan Horck 《Maritime Policy and Management》2013,40(1):15-29
This paper presents a simple formulation in the form of a pipe network for modelling the global container-shipping network. The cost-efficiency and movement-patterns of the current container-shipping network have been investigated using heuristic methods. The model is able to reproduce the overall incomes, costs, and container movement patterns for the industry as well as for the individual shipping lines and ports. It was found that the cost of repositioning empties is 27% of the total world fleet running cost and that overcapacity continues to be a problem. The model is computationally efficient. Implemented in the Java language, it takes one minute to run a full-scale network on a Pentium IV computer. 相似文献
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On cost-efficiency of the global container shipping network 总被引:1,自引:0,他引:1
Dongping Song Jie Zhang Jonathan Carter Tony Field James Marshall John Polak Kimberly Schumacher Proshun Sinha-Ray John Woods 《Maritime Policy and Management》2005,32(1):15-30
This paper presents a simple formulation in the form of a pipe network for modelling the global container-shipping network. The cost-efficiency and movement-patterns of the current container-shipping network have been investigated using heuristic methods. The model is able to reproduce the overall incomes, costs, and container movement patterns for the industry as well as for the individual shipping lines and ports. It was found that the cost of repositioning empties is 27% of the total world fleet running cost and that overcapacity continues to be a problem. The model is computationally efficient. Implemented in the Java language, it takes one minute to run a full-scale network on a Pentium IV computer. 相似文献
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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. 相似文献