Toward an SCA-OSGi based middleware for radio frequency identification applications

The radio frequency identification (RFID) technology progressing is becoming a increasing interest in several application areas. To accommodate diverse and changing requirements from applications,RFID middleware should be reconfigurable. However,current RFID middleware is limited in its ability to support reconfiguration. To solve this problem,we adopt the service-oriented component-based approach in building the middleware. Component-based design enables decomposition of middleware functionality and is eas...     

How do the new shipping routes affect Asian liquefied natural gas markets and economy? Case of the Northern Sea Route and Panama Canal expansion

This study focuses on the expected impact of Northern Sea Route (NSR) usage and the Panama Canal (PC) expansion on liquefied natural gas (LNG) imports of Asian countries, from not only the macroeconomic viewpoint but also diversification of the supplying countries. First, the amounts saved from shipping costs due to these events are estimated, based on scenarios on the navigable period of the NSR, transit fee of the NSR considering the exchange rate between the Russian ruble and US dollar, and bunker fuel price. Second, a spatial general equilibrium model based on macroeconomic theory is applied to predict changes in LNG trade patterns and measure economic impacts due to the reduction of shipping costs. Finally, the impacts of NSR usage as well as the PC expansion on LNG imports of Asian countries are discussed based on the calculations. The results show that diversification of supplying countries for LNG imports can be observed, especially in Japan, the largest LNG importer in the world, and other Asian countries are secondarily affected by changes in Japan’s import pattern, with limited impacts on these countries’ national economies.     

CR200J-3型动力集中动车组WTB通信可靠性提升研究

简要介绍CR200J-3型动力集中动车组编组形式和列车网络控制系统拓扑结构的基础上,分析了CR200J-3型动力集中动车组在特定区段WTB通信异常问题及其形成原因,并提出了优化方案.实际应用表明,优化后该型动车WTB通信抗干扰性明显提高,降低了故障率,为保障列车的可靠运行提供重要支撑.     

基于顶层设计的船用网关软件的开发

船用网关是机舱自动化中上、下层网络联结的关键设备,介绍了基于嵌入式WindowsCE操作系统下面开发的基于顶层设计的图形化监测软件及其人机交互监测和控制,协议转换,报警等功能。该系统运行稳定可靠,模块化强,提高了船舶机舱监控的自动化水平。     

基于HIL的车载网关控制器的自动化测试研究

车载网关控制器(简称GW)是汽车网络架构中重要的ECU控制单元,负责不同网络之间报文与信号的转换与路由处理。因此,网关控制器的可靠性要求是非常高的。文章对网关控制器测试验证进行了自动化测试研究,提出了两种实现网关自动化测试的方法,对网关控制器研发过程中的测试验证提供了极其重要的参考价值。     

豪华邮轮远程监控系统的设计与应用

针对豪华邮轮远程监控系统在实时监管、采集信息并实时发送、规划和处理应急情况方面的功能,系统地介绍远程监控系统各组成部分,对远程监控系统在邮轮上的应用进行深入解析,为国内自主设计开发相应系统提供借鉴与支持.     

基于PLC & ZigBee技术物联网家庭网关的研究与实现

提出了一种基于PLC和ZigBee技术的物联网家庭网关设计方案。本设计方案以S3C2440作为主控芯片,并集成了ZigBee协调器、电力载波调制解调电路、蓝牙通信电路。操作系统采用Linux 2.6.32,并以此作为软件开发平台移植了Boa Web服务器、Sqlite嵌入式数据库。该网关以电力载波通信技术(PLC)为主,辅以ZigBee及蓝牙无线通信技术,构成了物联网感知层网络结构,本网关综合了无线及有线两种感知网接入方式,组网灵活、方便。     

基于非洲陆锁国腹地的门户港前景分析

非洲范围内陆锁国腹地的门户港发展前景分析具有独特性,须考虑区位条件、地缘政治、政局稳定性、竞争形势、陆锁国运输需求分布等多种要素,与国内一般的港口竞争研究和发展前景研究有所不同。阐述非洲区域陆锁国腹地的门户港发展前景研究思路及所涉及的要素,并结合实例阐述某门户港发展前景,以期为类似咨询项目的开展提供研究思路,也可为海外相关港口投资机会的研究提供参考。     

Relevance of the Northern Sea Route (NSR) for bulk shipping

Some scholars consider that today’s market conditions are in favor of the Northern Sea Route (NSR) rather than the Suez Canal Route (SCR). However, the number of bulk carriers using the NSR remains extremely limited, despite higher fuel prices since 2009 and subsequent significant fuel savings. In 2013, there were 53 transits via the Arctic, out of which 27 by oil tankers and 6 by bulk carriers. In this article we show that this result might be attributable to a factor, which is not considered in most studies: the spot freight rate to fuel ratio which governs ship owners’ decisions regarding the sailing speed. Due to a low ratio since 2011, the speed of vessels on the SCR is at its lowest level, and potential NSR fuel savings are too limited to provide a viable alternative. We further argue that, contrary to most studies, internalizing NSR environmental benefits marginally improves the attractiveness of the NSR.     

Case studies of shipping along Arctic routes. Analysis and profitability perspectives for the container sector

Arctic sea routes have for long attracted interest from observers and shipping companies because of their shorter distances between the Atlantic and the Pacific. The prevalence of sea ice prevented the real development of a significant traffic, but did not prevent research from trying to assess the economic viability of these routes. With the actual present melting of sea ice in the Arctic, this effort at modeling the profitability of Arctic shipping routes received a new impetus. However, the conclusions of these studies vary widely, depending on the chosen parameters and their value. What can be said of these models, from 1991 until 2013, and to what extent can a model be drawn, capitalizing on twenty years of simulations?