基于软交换IP中继媒体网关的实现

随着IP技术的发展，传统的PSTN通信N络也在逐步向IPN络方向发展，下一代N络（NGN）是融合话音、数据和图像的多业务IPN络，是未来通信N络的发展方向。基于当前通信网络的实际情况，简单介绍了基于软交换的中继N关的特点和功能结构。     

基于虚拟仪器的燃料电池汽车高性能网关测试系统的构建

简要介绍燃料电池汽车高性能网关(HGT)的功能;详细介绍基于NI虚拟仪器的高性能网关测试系统的架构及其工作原理;围绕动力系统和车身系统CAN信息的相互转换,动力系统CAN信息转换成硬线信号;从开关量、模拟量信号的采集、转换和传送等3个方面给出测试系统的软件设计;提出测试结果的评判标准;利用测试系统对高性能网关进行实际测试,结果表明测试系统达到预期设计要求,具有良好的效果。     

应用于轨道车辆的集成通信系统

简要介绍了应用于轨道车辆的集成通信系统的架构、系统内部接口规范,并对其实现的可行性及相关的通信过程、车辆动态识别、信息安全等进行了说明。     

基于CAN总线的RS485冗余网关设计与实现

CAN工业现场总线系统凭借可靠性高,实时性好,通讯灵活等特点受到国内外铁路车辆制造厂的青睐,已有基于CAN工业现场总线的列车网络在地铁车辆上得到应用,同时RS485总线使用广泛。文章详细描述了一种具有冗余CAN接口的RS485网关的设计原理,以及实现过程,通过此网关可实现CAN总线与RS485总线通讯。     

Assessing the cost and CO2e impacts of rerouteing UK import containers

Among the most important trade-related issues currently confronting the UK are the environmental implications of very large volumes of containerised freight being handled at a small number of ports while there appears to be significant potential for using other ports and water-rail intermodal connections. Six UK ports are selected for the analysis: Hull/Immingham, Liverpool, Felixstowe, Southampton, Dover and Bristol. Through an origin-destination analysis, the cost and CO₂e impacts of UK port trade patterns are compared using the actual situation against three proposed Scenarios: (1) the re-direction of containers by a combined expansion of Hull and Immingham; Liverpool; and Bristol, (2) moving containers by rail facilitated via expanded capacity at Southampton, and (3) moving containers by rail through expanded capacity at Felixstowe. The research found that transporting containers from Felixstowe and Southampton to the northern regions by rail has the lowest CO₂e impact, and is the most feasible option, although constraints exist in terms of infrastructure provision, water depth and rail network capacity.     

Folksonomy用于航海信息门户个性化知识组织初探

论述航海信息门户的个性化知识组织具有重要意义,从folksonomy突出的个性化特征、强大的知识聚合与共享功能及广泛的应用领域等方面,分析其应用于航海信息门户的个性化知识组织具有可行性,指出为了保证航海信息门户知识组织的个性化与专业化、学术化并存,应积极实现folksonomy与传统分类的有效融合.     

基于连通概率的Mesh网关节点选择

在无线Mesh网中常出现网络分割的现象,本文从优化通信可靠度的角度展开多网关节点的布设方案的研究。首先提出基于链路质量指标计算链路的状态和有效概率的方法,接着设计子网划分算法,然后提出具有时效性的可靠度计算模型。通过NS-2下的仿真实验,结果证明了基于可靠度的网关节点选择方案的有效性。     

基于BPMN(业务流程建模与标注)标准实现新型综合监控联动模型的探讨

传统的综合监控系统联动方式已无法满足地铁运营的需求。提出了一种基于BPMN(业务流程建模与标注)2.0标准的联动设计方案,通过对业务活动、网关及事件等抽象组件的建模,运用状态机方式灵活组态执行流程来实现复杂的联动功能。该方案可实现联动建模的复用性,提高自动化建模的程度,并解决了传统联动方式无法描述及实现复杂逻辑的应用场景的问题,增加了地铁运营的可靠性及安全性。     

浅析七号信令集中监测系统采集网关的实现

基于七号信令具有信令速度快,容量大,灵活性强等特点,介绍了七号信令集中监测系统的工作原理,并对系统采集网关的数据处理流程、各功能模块的作用进行了分析。     

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...