舰船随机网络节点无线路由协议算法优化分析

为了提高舰船随机网络的传输性能,需要进行网络的节点无线路由协议优化,提出基于最短路径寻优的舰船随机网络节点无线路由协议算法。构建舰船随机网络节点的最优部署模型,采用无线路由节点的终端探测方法进行舰船随机网络路由传输的均衡控制,采用分集均衡调度的方法进行无线传输的负载均衡控制,基于最短路径寻优方法建立舰船随机网络的路由均衡协议,实现舰船随机网络节点无线路由协议优化。仿真结果表明,采用该方法进行舰船随机网络节点无线路由设计,提高了网络传输的均衡性,降低了输出误码。     

船舶无线传感网络节点数据的采集方法研究

通过对船舶无线传感网络节点数据,进行船舶无线传感组网设计,提高对船舶运行状态的分析和监测能力,提出一种基于量化融合跟踪和多线程总线调度的船舶无线传感网络节点数据的采集方法。进行船舶无线传感网络的路由拓扑结构设计,进行网络节点的最优分布路由控制和定位。在传感器节点优化定位算法设计的基础上,进行数据采集系统的硬件设计,采用32位数据总线进行船舶无线传感数据的高速捕获和总线传输,在FIFO RAM缓冲区采用连续脉冲冲激方法进行数据激发,将采集的数据存储在SCSI数据硬盘和局部总线中,实现数据实时调度和分析。测试结果表明,该采集方法能有效实现船舶无线传感网络节点数据的多线程多通道采集,数据检测和输出的准确性和实时性较好。     

船舶通信系统中的信道分配算法设计

船舶通信系统的信道分配可有效均衡信道负载、节约通信开销,为此,提出基于新的船舶通信系统信道分配算法。首先建立船舶通信系统的通信能耗模型,然后采用链路节点自适应收发方法均衡控制船舶通信系统信道分配,并采用链路节点自适应收发控制模型控制不同接收阵元,建立节点和资源信息调度之间的联系,达到合理分配船舶通信系统信道,最后对船舶通信系统信道分配算法的性能进行仿真测试。结果表明,本文方法提高了船舶通信系统的吞吐量,使各信道之间的负载更加均衡,能够大幅度降低船舶通信系统通信开销,是一种有效的船舶通信系统信道分配算法。     

云环境下演化博弈模型的任务调度算法研究

本文研究云环境下演化博弈模型的任务调度算法,从用户任务方博弈、云资源方博弈、用户反馈博弈等方面进行调度算法的详细阐述。并在实验仿真过程中,将本文算法与FCFS调度算法以及带有负载的基于贪心策略的调度算法进行对比。实验结果表明,本文算法针对性、执行效率高、成长性强。     

负载均衡的舰船网络最短路径路由算法

为了提升舰船网络的吞吐量,降低网络的带宽阻塞率和时间成本,在负载均衡技术的支持下,提出舰船网络最短路径路由算法。结合舰船网络的运行原理和拓扑结构,构建舰船网络模型。在该模型下,选择混合路由协议作为网络传输协议。判定舰船网络节点负载状态,根据判定结果实现对舰船网络节点负载的均衡控制,并通过最短路径的计算与选择,实现舰船网络最短路径路由。经过与传统路由算法的对比实验得出结论:设计路由算法的带宽阻塞率和时间成本有所降低,吞吐量降低了约29.65 MB。     

基于节点电势法的舰船电力系统潮流计算方法

针对舰船电力系统中非线性负载尤其是异步电动机负载较多,且发电机组数量多、容量小,需考虑其功率分配关系等特点,提出基于节点电势法的潮流计算改进算法。利用此算法对一个8节点的典型舰船电力系统模型进行计算,并通过Matlab软件仿真予以验证。结果表明,该算法具有计算精度高、收敛速度快等特点。     

一种嵌入式航海数据采集系统方案设计

本文首先研究了基于无线传感器组网的数据采集系统以及其中的技术逻辑,分析了航海雷达数据的特性。针对雷达数据的高频采样率,本文设计一种新的多通道组网方式来处理航海雷达回波的数据采集方案,并给出雷达数据的采集汇聚算法,该算法对舰队组网中的节点进行规划,通过相邻节点组成簇,来提高数据采集的实时性。最后基于此系统所采用的多通道组网方式以及汇聚算法设计了基于DSP的嵌入式仿真系统,验证了该多通道组网方式以及汇聚算法的有效性。     

舰船交直流混合电力系统能量优化调度方法

海洋开发和船舶电网电力系统的不断发展,使电力系统调度系统所需要处理的工作数据越来越复杂,整体调度速率已经难以满足船舶电网系统需求。对此设计舰船交直流混合电力系统能量优化调度方法,首先基于MAPReduce计算模型,搭建云平台计算结构,对舰船交直流电力系统数据进行分布式计算和节点通信;基于搭建的云平带计算结构,设计舰船混合电力系统能量优化调度算法,采用十进制资源对应编码,实现电力系统能量优化调度。仿真实验证明,相比较传统电力调度方法,优化后的调度算法交流电调度速率提高27.5%,直流电调度速率提高17.5%,可以明显提高电力系统能量调度速率。     

远距离海上航行舱内人员实时定位系统研究

传统系统采用PCA降维方法受到噪声影响,造成系统定位不准确,为了解决该问题,提出了基于Isomap算法的实时定位系统研究。根据实时定位系统总体结构,采用型号为CC2431芯片设计移动节点,路由节点可实时接收来自移动节点模块信息,进行灵敏度分析可完成信息传递。接收舱室内各个路由节点信息,通过协调模块验证信息有效性。针对协调模块获取高维数据,采用Isomap算法对数据进行降维处理,依据降维后的数据集,对远距离海上航行舱内人员进行实时定位。通过实验结果可知,该系统最高定位精准度可达到75%,为航行舱内人员安全提供保障。     

内河港口散杂货智能化作业管理与决策系统

介绍了一个面向内河散杂货港口的智能化作业管理与决策系统。该系统采用互联网+、RFID等技术对作业设备和计量设备进行技术升级,实现了设备数据采集的无人化;通过作业车辆的GPS定位数据和作业设备数据来管控作业流程,实现了作业管理的自动化;通过专门设计的推荐算法,向调度员推荐智能化作业调度方案。实践表明,该系统可提高散杂货作业调度效率和设备利用率。     

Errata

正In the paper"Influence of Fouling Assemblage on the Corrosion Behaviour of Mild Steel in the Coastal Waters of The Gulf of Mannar,India"in Vol.12,No.4,Page:509,References were lost,and the two authors’biographies were identical.The correct text is shown below.We apologize to the authors and our readers for any inconvenience caused by the errors.     

Journal of Marine Science and Application 2014 Sum. Contents

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第34届海洋、离岸及极地工程国际会议(英文)

正St.John's,Newfoundland,Canada,May 31-June 5,2015 OMAE2015 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to: meet and present advances in technology and its scientific support;     

33rd International Conference on Ocean,Offshore and Arctic Engineering （OMAE2014）

正San Francisco,California,June 8-13,2014.OMAE 2014 is the ideal forum for researchers,engineers,managers,technicians and students from the scientific and industrial communities from around the world to:·meet and present advances in technology and its scientific support;·to exchange ideas and experiences whilst promoting technological progress and its application in industry·to promote international cooperation in ocean,offshore and arctic engineering.In line with the tradition of excellence of previous OMAE conferences,more than 900 technical papers are planned for presentation.Outreach for Engineers Specialty Forum This Specialty Forum is designed for students and professionals who may not be familiar with the Ocean and Offshore industry,as well as those who have just recently specialized in this field.     

联合作战计划和执行系统

全球指挥控制系统(GCCS)实施当前美国海军网络中心战信息基础设施的联合计划网络。联合作战计划和执行系统(JOPES)支持GCCS实现联合计划。JOPES有两类计划：时间不限的精密预案计划生成作战计划、方案计划或职能计划；时间敏感的危机行动计划生成作战命令或战役方案。前者在和平时期创建的作战计划是后者的计划基础，加速应付危机的能力。     

Recent progress on wave induced loading measurements in warships

Recent measurements of wave induced hull strain and flexure in RN warships are presented together with the derivation of the current design criteria for extreme hull girder bending loads. The history of the development of the shipboard instrumentation used is given and recent developments to improve the quality and ease of analysis of the data are described. An unexpectedly high transverse asymmetry in the longitudinal strains measured in destroyers is shown to be the result of a combination of vertical and lateral bending in oblique seas. Finally recent theoretical comparisons between the loading of Deep-Vee hulls and conventional UK rounded bilge hulls are presented which demonstrate the higher loading experienced by this type of hull form.     

The 11th International Conference on Hydrodynamics (ICHD 2014)

正19–24 October 2014 SingaporeCONFERENCE THEMES The overall aim of the ICHD Conference is to provide a forum for participants from around the world to review,discuss and present the latest developments in the broad discipline of hydrodynamics and fluid mechanics.The first International Conference on Hydrodynamics(ICHD)was initiated in 1994 in Wuxi,China.Since then,9 more ICHD conferences were held subsequently in Hong Kong,Seoul,Yokohama,Tainan,Perth,Ischia,Nantes,Shanghai and St Petersburg.Evidently the ICHD conference has become an important event among academics,researchers,engineers and operators,working in the fields closely related to the science and technology of hydrodynamics.The 11th ICHD will be held in Singapore in 2014.     

第十二届深水操作会议和展览会(英文)

正November 4-6,2014Moody Gardens HotelConvention Center/Galveston,TX The Deepwater Operations Conference and Exhibition is celebrating its 12th anniversary this year.This growing event will continue the tradition of excellence in addressing operational challenges involved in developing deepwater resources.We will return to the Moody Gardens Hotel and Convention Center on November 5-7,2014 in Galveston,Texas.     

Eastbound or westbound ?

In terms of equal sailing distances, where is the inflexion when ships depart from ports in the Asian Continent to New York via Suez and/or Panama？
The answer is China South Port Group （Hong Kong, Shenzhen and Guangzhou）.     

Impact of regulation on the performances of long-distance transport services: A comparison of the different approaches in Sweden and Norway

Despite the many socio-economic similarities between Sweden and Norway, differences in jurisdiction, organisation, cooperation, and financing of long-distance passenger train and coach services have led to the development of four distinctively different ways of serving the markets. This paper describes how the train and coach markets have developed in the two countries, with emphasis on regulatory and industrial structure and a couple of performance variables.Looking at passenger rail, both countries separated infrastructure from operation over a decade ago. However, while Norwegian rail is characterised by an almost monopoly supplier, rail services in Sweden are partly decentralised to the responsibility of county authorities and are widely subjected to competitive tendering. The rest of the network is about to be opened up for on-the-track competition. Swedish Rail (SJ) has spent the last decades consolidating its core business (passenger rail) and sold out its other businesses. In contrast, the Norwegian state rail (NSB) has expanded its business to become a major bus operator and property owner, with extensions also into the Swedish market.The coach industry was more recently deregulated in both countries. The Swedish coach market is dominated by privately owned companies operating services to and from Stockholm. In Norway, state-owned NSB is a major coach operator on medium distance routes, and is also the largest partner of Nor-Way Bussekspress which totally dominates long-distance coach services. Further, the Norwegian coach market is characterised by cross-ownership and cooperation which has enabled an extensive route network which covers most of Norway.We find distinct differences in achievements in the two modes and in the two countries. Swedish rail services have succeeded in winning market shares and in renewing and developing both infrastructure and service levels to a greater extent than the Norwegian model. On the other hand, the Norwegian coach market seems to be more developed and efficient compared to its Swedish counterpart.The paper concludes with a discussion on the possible links between the different approaches and the performance observed, with the aim to stimulate further and more detailed research on some important issues.