串行可编程多路数字PWM发生器设计

介绍一种利用Flash-CMOS结构现场可编程芯片（Field Programmable Gate Array,FPGA）实现串行可编程多路脉宽调制（Pulse Width Modulation,PWM）发生器的设计。通过本设计可使系统扩展出多路PWM输出,且每路输出都可以独立工作和编程配置。该PWM发生器可通过SPI规范串行接口进行参数配置,可对相位、脉宽和频率进行设置。它具有精度高、速度快、可靠性高、灵活性强等优点。此扩展PWM发生器设计已在实际模块上成功运用。     

基于西门子S7-200自由口多机通信系统

介绍了S7-200PLC的自由口通信协议的实际应用,提出了S7-200PLC与多路具备RS232串口输出的称重设备的串行通信协议的设计方法。     

揭示板的多路控制系统

设计一种以串行输入为基础，串并混合方式输出的多路控制系统。     

多路RS-485板的开发与应用

多路RS-485板采用RS-485通信构成远程控制网络,该网络的拓扑结构采用总线结构,传送数据采用单片机通信,传输介质为4芯屏蔽电缆。硬件设计包括通信接口收发模块与多路串口通信技术2个主要部分,在通信接口收发模块中,介绍了MAX485收发器的原理及应用;而在多路串口通信技术中,介绍了该电路板中SC16C554芯片的性能及应用。针对RS-485网络的应用层,介绍了ModBus通信协议的协议特点。该电路板在船舶自动化领域已经得到了广泛的应用。     

基于单片机AT89C51的数据采集系统设计

本文介绍了基于单片机AT89C51的智能化多路数据采集系统的原理、结构和功能。系统能对8路信号进行智能化、高速采集,并将采集得到的数据通过直接存取控制方式或CPU控制方式送入外扩存储器或通过串行121送至Pc机,以利于数据的分析、处理。     

液晶显示器的汉字显示新方法

以AT90CAN128单片机为基础,介绍了液晶模块与单片机的接口电路,描述了通过串行的DataFlash存储汉字字模数据,同时给出了液晶初始化和显示模块的设计思路以及软件实现,并且简要介绍了该方法在船舶机舱报警监控显示系统的运用.     

基于单片机的多路船舶漏水预警系统

现有的多路船舶漏水预警系统存在着可靠性低、响应速度慢的弊端,为了解决上述问题,提出基于单片机的多路船舶漏水预警系统设计研究。多路船舶漏水预警系统硬件设计包括主控芯片、传感器与报警器设计,软件设计包括水位检测模块、信号处理模块与漏水报警模块。通过硬件与软件的设计实现了多路船舶漏水预警系统的运行。通过实验得到,与现有的多路船舶漏水预警系统相比,设计的多路船舶漏水预警系统极大地提升了系统的可靠性与响应速度,充分说明设计的多路船舶漏水预警系统具备更好的预警性能。     

PLC通信在舞台吊杆控制系统中的应用

本文介绍了在舞台吊杆控制系统中，利用PLC的串行通信模块完成位置反馈信号采集和人机界面数据交换。实践表明，该方法可简化系统结构、降低成本。     

IEC 61162标准扩充定义及船用数据接收器设计

IEC61162标准的扩充定义方便了船舶设备的信息共享.船用数据接收器采用现场可编程门阵列(FPGA)作为主控制器,在FPGA内实现通用异步串行数据接收单元,采集并传送多路IEC61162格式的标准数据.该方案很好地解决了多路数据并行接收的问题,以语句为单位接收并上传的方式减轻了主机整理数据的工作量.该接收器现已成功地运用于船舶航行数据记录仪.     

Simulink软件环境的DSP串行通讯开发与应用

介绍了应用MATLAB的仪表控制工具箱模块与DSP实现RS232串行通讯的方法,即Simulink环境下通过对串口模块进行配置,DSP上应用CCS开发串口通讯程序和控制算法.开发的程序在船舶电力推进硬件在环半物理仿真中得到应用.     

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

正~~     

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.