超宽带安全性的研究

超宽带是一种新兴的高速率,低功耗的无线通信技术.根据超宽带的特性,选择性地分析了无线通信协议栈中的物理层和数据链路层的安全问题,对其相应的安全措施做出分析和研究.     

贝叶斯压缩感知在船舶通信超宽带信道估计中的应用

超宽带技术是无线通信技术中的关键技术。随着船舶业的飞速发展,数据量的增长速度越来越快,产生的大量数据在进行数据通信的过程中需要进行压缩。本文将基于贝叶斯压缩感知技术应用于船舶通信超宽带信道估计中,阐述超宽带压缩感知模型,并设计贝叶斯重构算法。最后将本文算法与传统基追踪算法进行了重构时间和重构误差性能方面的对比,对比结果说明本文算法的优越性。     

超宽带技术在船舶系统中的应用前景

超宽带技术是一种高速、低成本和低功耗的新兴无线传输技术,有着广阔的应用前景。通过对超宽带技术特点的介绍和船舶系统特定应用环境的分析,提出超宽带技术在船舶系统中的应用方向,为船舶系统的通信和安全等方面提供一些新的解决方案。     

UWB技术在船舶避碰领域中的应用

超宽带（UWB）技术是一种当前短距离无线通信关键技术,以其高速率、高频谱利用率、低功耗和应用广泛等一系列优点受到各行各业的关注.论文利用UWB诸多优点,将其应用于船舶航行中的船舶定位和避碰,保证船舶海上航行安全.     

基于GPRS网络的数据无线传输实现接口

介绍了GPRS无线数据通信的工作原理及应用GPRS技术进行无线通信的设计方案、软硬件的实现。嵌入式GPRS无线通信技术为数据传输业务提供了极大的便利,缩短了应用系统的开发周期,减小了开发难度和风险,具有很高的市场应用前景。     

超宽带无线传感器网络及其军事应用展望

无线传感器网络是一种全新的信息获取、处理和传输技术.在简要介绍无线传感器网络体系结构的基础上,分析了以超宽带无线电(ultra wide band radio)为基本传输手段的新型超宽带无线传感器网络与传统正弦无线电传感器网络相比所具有的优越性.最后,针对超宽带无线传感器网络的特点指出了这项技术目前面临的主要难点,提出了几点研究设想以及其在军事领域的应用展望.     

超宽频带与MIR雷达

时下，人们对于超宽频带（ＵＷＢ）技术及在军事、民用方面的应用产生了较大的兴趣。超宽带技术采用的信号带宽大于中心频率的２５％。而常规无线电信号带宽通常小于中心频率的１％。采用超宽带的雷达、通讯、电子战和民用方面有其独特的优点。本文了超宽带技术，并与窄进行了比较，最后给出一个超宽带技术的一个成果－－微功率冲击雷达（ＭＩＲ），列出了其主要性能指标，说明限其主要应用。     

无线传感器网络在协同作战中的应用

无线通信是协同作战中的主要信息传输方式,由于传统的基于数据链的信息传输方式存在较大的弊端,因此无线传感器网络技术就成为协同作战中无线通信发展的必然方向.详细介绍了现阶段无线传感器网络在协同作战中的应用现状,综合分析了应用难点及其潜在的改进方法.     

无线通信技术在车联网中的应用探讨

无线通信技术作为车联网发展的基础,其应用的安全性和可靠性关系到车联网的实现和发展。文中在阐述车联网概念的基础上,总结了无线通信技术在车联网中的具体应用,分析了未来无线通信技术的发展趋势及其对车联网发展产生的影响。     

DS-UWB通信系统的信号兼容性分析

采用超宽带(UWB)技术的无线通信系统,在实现对无线电频谱资源的充分利用的同时,也成为传统窄带系统的一种潜在干扰源.首先,通过对直扩超宽带(DS-UWB)信号功率谱密度的研究,分析了DS-UWB对典型窄带系统的干扰.其次,研究了DS-UWB信号功率谱密度的典型包络形式,已调信号功率谱的连续、离散成分和脉冲重复频率(PRF)对信号功率谱的影响,进而提出并讨论了合理设计伪码形式和选择PRF参数以减轻干扰影响的初步方案,最后讨论了DS-UWB与受扰系统的共存性.     

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.