船舶自动识别系统中的无线局域网通信技术研究

现有的船舶自动识别通信系统(AIS)主要用于VTS领域船舶报文的传输,其无线通信网络采用STDMA技术,信道负载率符合通信网络性能要求。随着海上船舶电子设备及业务种类的增加,通信信道负载加重,无线通信网络的吞吐量较易出现堵塞,如何建立合理的通信仿真模型对船舶自动识别系统的网络性能进行仿真是解决问题的关键。本文在研究现有船舶自动识别系统网络架构的基础上,设计一套AIS网络性能仿真系统,并进行仿真测试。     

船舶自动识别系统对船舶救助的影响

船舶自动识别系统,简称AIS系统,诞生于20世纪90年代,是集现代通信、网络和信息技术于一体的多门类高科技新型航海设施和系统。随着AIS的快速发展,近年来,在船舶导航、避碰、船舶通信、船岸通信、海上搜救、海事调查等方面发挥着至关重要的作用。此文重点谈谈AIS对船舶救助中的影响。     

舰船自动识别系统中的网络安全技术研究

随着我国海上及内河航运业的发展,各港口的集装箱运输量急剧增加,海上运输船只的体积与数量也随之增加,如何保障船舶的运行安全及效率是现代航运业的重要研究领域之一。同时,随着电子信息技术的发展,船舶自动识别系统(AIS)成为大型运输船舶必要电子装备,保障了各船舶之间的信息有效识别。本文研究现有的船舶自动识别系统,重点分析AIS电文信息解析及AIS信息处理系统,提出基于AIS系统的网络安全传输技术。     

船舶自动识别系统(AIS)

船舶自动识别系统(AIS)是工作在VHF海上频段的岸基和船载广播式自动识别应答器系统,是集现代通讯、网络技术和信息技术于一体的新型助航系统和海上安全信息系统.其系统的特性和功能使它成为增强船舶航行安全和提高船舶交通管理效率的新型重要工具.     

船舶AIS中基于自适应神经网络人工智能的路径搜索技术研究

相对于陆地货物运输和航空运输,海上航运具有成本低、安全性能高、运量大等优点,已经成为现代世界商品交流与贸易的最主要途径。为了进一步提高海上航运的效率和安全性,本文针对船舶AIS系统的航线与路径搜索技术进行了深入的研究。船舶AIS系统是一种船舶自动识别系统,在船舶管理、航线调度等领域发挥着重要的作用。本文首先介绍了自适应神经网络算法,然后基于该智能算法开发了一种船舶AIS的智能路径搜索技术,并介绍了该技术的原理和工作流程。     

基于北斗卫星的舰船监控与海域交通流量控制系统开发

随着北斗卫星发展,其信号覆盖范围及定位精度达到海上舰船安全监控系统的要求。现代海域流量控制系统大多基于AIS基站提供的船舶静态及动态数据,由于各类港口AIS数据格式不统一,流量控制及监控系统开发难度较大,维护困难。本文分析了船舶安全监控领域下北斗卫星的导航技术及通信网络结构,设计了基于北斗导航与GPRS网络相结合的舰船综合安全监控系统。     

基于AIS的海上无线数据通信网络研究与仿真

无线自组网(AD hoc)是当前实现近距离船舶间通信的主要手段。实际应用过程中,由于船舶自身的位置复杂多变,船舶的标识难以统一等原因,船舶间的无线自组网通信一直未能得到广泛应用。针对以上问题,本文提出一种基于船舶自动识别系统(AIS)的海上无线数据通信网络,该网络利用AIS所具有的船舶位置、航向、速度等信息,能够给予船舶唯一精确的标识,同时对该网络中的位置发现协议与路由协议进行研究,提出多维位置发现算法和基于AIS的路由算法,实现了海上船舶之间的有效通信。     

AIS系统ITU-RM.1371协议研究

船舶自动识别系统(AIS)是工作在VHF海上频段的新兴的船舶和岸基广播系统。本文介绍了AIS相关国际标准体系,着重分析了ITU 1371协议的分类、演进、通信主题等,并进一步阐述了AIS技术应用及与北斗卫星导航系统融合的前景。     

船舶自动识别系统中视觉跟踪控制研究

船舶自动识别系统AIS诞生于20世纪90年代,最初是由舰船、飞机的敌我侦察系统发展而来的,船舶自动识别系统不论在军事领域还是民用领域都具有非常广泛的应用,包括船舶定位和导航、船舶通信、渔业生产管理等。船舶自动识别系统主要由海岸基站、VHF通信器和船载基站等组成,目前,在船舶的障碍避让、船岸通信、海上交通管理等方面发挥着必不可少的作用。本文针对传统的船舶自动识别系统,将机器视觉跟踪技术应用于船舶的识别和侦察过程中,并对该系统的噪声过滤等问题进行研究,大幅提高了AIS系统的船舶识别效率,具有重要的意义。     

基于物联网容错路由算法的船舶通信链路应用

通信与导航系统是船舶的重要组成部分,包括卫星通信站、GPS系统、AIS船舶自动识别系统、电罗经等部件。目前,微型计算机技术迅速发展,船舶通信与导航系统逐渐向着基于计算机技术的自动化综合导航、通信系统发展。物联网技术是一种以互联网为基础的面向实物的智能网络,被誉为新一代信息技术的革命,引起各行各业的广泛关注。本文结合物联网的容错路由算法,对船舶通信系统的链路容错能力和网络节点等关键技术进行系统研究。     

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.     

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;     

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.