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1.
面向物联网体系的海上通信云平台 总被引:2,自引:2,他引:0
随着海上通信平台应用业务的扩展,如物联网体系海上视频监控系统、气象传感网络及目标探测系统等,所有这些系统的数据传输及消息传递都基于海上通信平台,所以一个高效、实时性好并且传输速率高的通信平台是成为海上电子信息系统应用的关键。而云计算平台是基于虚拟化、分布式及并行计算的信息系统,能够有效提高信息计算、传输及存储效率。本文在研究现有海上通信系统及云平台技术的基础上,提出面向物联网体系的海上通信平台,并进行仿真。 相似文献
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云平台中的并行船舶综合电网调度系统研究 总被引:1,自引:1,他引:0
《舰船科学技术》2015,(7):149-152
海上电网供电系统对船舶持续稳定的电压供给是保证其海上航行的关键。随着海上船舶数量及体积的增加,海上船舰电网调度系统所需处理的信息随之增大,并且已经越来越不能满足对舰船供电负荷计算实时性的要求。基于现代信息处理的云平台能够利用分布式计算架构,将各船舶的供电负荷计算分配到各节点进行并行计算,能够有效解决原调度系统计算中心的性能瓶颈。本文在此基础上,提出一种云平台中的并行船舶电网调度算法,并给出了算法的实现方法。 相似文献
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一种基于物联网的海上气象传输系统设计 总被引:2,自引:2,他引:0
在海洋航运业中,对气候变化的准确快速获取是保证其安全行驶的关键要素之一。海洋气候具有变化速度快﹑气温不稳定的特性,对其信息的准确高精度采集及有效传输是海上气象系统的重要研究方向。本文分析了近年来热门的物联网技术,将无线传输器与传感网络(WSN)应用到海面气象传输系统的设计中。最后对气象传输系统中的无线路由算法(LEACH)进行了分析及优化。最后通过仿真实验得到优化后的海上气象传输系统的性能有较大的提升。 相似文献
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《舰船科学技术》2016,(17)
为保障海上船舶运输数据的有效采集和监控,需要对海上船舶运输数据环境监控系统进行设计。采用当前算法进行监控时,存在监测范围小、成本高、功耗高、实时性低等问题。为此,提出一种低功耗适用于海洋运输环境的物联网动态监控的节点设计方案。该方案先定义基于物联网的海上船舶运输环境数据监控系统模型,将此系统模型分为无线传感网络、汇聚节点和监控中心,在此基础上对传感器节点、汇聚节点以及监控中心的硬件均进行设计,并给出基于ZigBee技术的无线传感器组网过程,设计出基于物联网的海上船舶运输环境数据监控系统。实验结果表明,该方法能够对海洋环境信息进行数据采集和动态监控,具有低成本、功耗低和丢包率低等方面的优点,具有可行性。 相似文献
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为保障海上船舶运输数据的有效采集和监控,需要对海上船舶运输数据环境监控系统进行设计。采用当前算法进行监控时,存在监测范围小、成本高、功耗高、实时性低等问题。为此,提出一种低功耗适用于海洋运输环境的物联网动态监控的节点设计方案。该方案先定义基于物联网的海上船舶运输环境数据监控系统模型,将此系统模型分为无线传感网络、汇聚节点和监控中心,在此基础上对传感器节点、汇聚节点以及监控中心的硬件均进行设计,并给出基于ZigBee技术的无线传感器组网过程,设计出基于物联网的海上船舶运输环境数据监控系统。实验结果表明,该方法能够对海洋环境信息进行数据采集和动态监控,具有低成本、功耗低和丢包率低等方面的优点,具有可行性。 相似文献
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海上大型船舶装备了大量的现代化设备,具有较高的智能化、自动化水平,可以进行24 h的海上勘测、船舶信息采集和气象信息采集等功能,研究船舶数据平台的数据存储与处理技术有重要意义。随着计算机技术与物联网技术的发展,船舶物联网平台成为了业内的研究热点。本文深入研究了船舶装备物联网服务平台的组成架构与原理,重点研究了船舶物联网平台海量异构数据存储与共享的策略,对改善海上试验平台的数据分析与处理能力有重要作用。 相似文献
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综合RFID技术、物联网技术及数据云技术,改进遥测遥控传输协议,航标器材(航标灯器除外)配置电子标签,航标灯器增加网关模块,为养护中心堆场和航标管理站点仓库搭架“小范围”航标器材管理平台;为海上浮动标志和固定助航标志搭建“辖区内”航标器材管理平台,通过航标灯器采集其他航标器材信息完成管理;在船舶和货船配置移动网关实现运输途中航标器材实时管控。通过三种方式数据融合,构建航标器材“一张图”智能管理云平台,达到航标器材全生命周期实时跟踪管理,解决航标器材管理混乱、智能化低、不可视等问题。 相似文献
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《船舶与海洋工程学报》2014,(2)
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. 相似文献
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《船舶与海洋工程学报》2014,(4)
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; 相似文献
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联合作战计划和执行系统 总被引:2,自引:1,他引:1
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。 相似文献
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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). 相似文献
The answer is China South Port Group (Hong Kong, Shenzhen and Guangzhou). 相似文献
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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. 相似文献
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桥梁防撞设施物理模型试验 总被引:1,自引:0,他引:1
物理模型试验是预报防撞设施所受撞击力及优化设计方案的主要方法之一。结合杭州湾大桥柔性防撞设施及东海大桥独立式防撞体设计方案,阐述了船—防撞体撞击试验的基本原理、方法、试验方案及相关试验结果。提出了柔性防撞系统的优化方案。试验结果表明,该方案经济有效,可供预报类似桥梁防撞设施撞击力时参考。 相似文献
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印尼某电厂项目码头水工建筑物包括码头、防波堤和护岸等主要组成部分。在该项目水工建筑物的设计过程中,综合考虑当地的自然条件、施工能力和材料来源等因素,不断优化结构选型和结构断面。根据不同使用要求,护岸分别采用直立式和斜坡式2种结构型式,推荐的设计方案节省投资、施工方便,可供同类工程设计参考。 相似文献
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Gunnar Alexandersson Staffan Hultén Frode Longva 《Research in Transportation Economics》2010,29(1):212-218
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. 相似文献