软件无线电技术在铁路通信中的应用

首先介绍目前先进的软件无线电技术,然后通过实际的研发项目,详细地描述此技术在铁路高速移动接入通信系统中的应用.     

Scheduling for Uncertain Data Broadcast in Mobile Networks

With the increasing popularity of wireless sensor network and GPS (global positioning system) , uncertain data as a new type of data brings a new challenge for the traditional data processing methods. Data broadcast is an effective means for data dissemination in mobile networks. In this paper, the definition of the mean uncertainty ratio of data is presented and a broadcasting scheme is proposed for uncertain data dissemination. Simulation results show that the scheme can reduce the uncertainty of the broadcasted uncertain data effectively at the cost of a minor increase in data access time, in the case of no transmission error and presence of transmission errors. As a result, lower uncertainty of data benefits the qualities of the query results based on the data.     

基于Java的Mobile Agent结构研究

与传统的分布式计算相比较,Mobile Agent模型无疑具有更广泛的发展前景.它采用面向对象的思想,使Agent具有了类的一切特性.Java语言由于其对网络和多线程支持还有与平台无关的特性使得它是一种适合开发Mobile Agent的语言.以Java为基础,提出了一种开发Mobile Agent的方案,并对相应的关键技术问题给予说明,讨论了系统的可扩展性和安全性,从而为实现Mobile Agent的开发开辟了新的途径.     

成都地铁票务管理信息化实践

针对成都地铁票务管理上的难点和痛点,通过信息化手段和互联网+的应用,对原有的现金收益审核工作进行无纸化改造,在车站购票/充值环节提供移动支付功能,解决票务运作上重复性工作量大、人工作业环节效率低易出错、业务人员数量随着线网规模不断增大等突出问题,基本实现票务管理的信息化、自动化和网络化,提质、增效、降成本效果显著。同时相关功能均是基于已运营的线路进行改造,可为其他城市改变既有的票务管理提供借鉴。     

GSM-R移动终端测试浅析

论述了GSM—R移动终端测试的重要性，根据相关规范提出GSM—R移动终端的测试指标，并结合测试仪器对GSM—R移动终端的测试方法进行了阐述。     

LMDT机车无线数据移动终端设备

论述了LMDT机车无线数据移动终端设备的组成、接口及功能业务情况,并且采用了双套通信模块及电源系统硬件冗余设计方案,确保CTCS-3级列控系统安全可靠地工作。     

基于ZigBee和GSM的桥隧贯通地线监测

我国铁路桥梁隧道处贯通地线由于不能埋地铺设而容易被盗或损坏.设计一种基于Zig-Bee和GSM技术的远程监测系统,对系统功耗进行了分析计算.对该监测系统进行了实际通信测试和功能计算.结果表明,本设计满足了桥隧贯通地线实时、长期防盗监测的要求.     

GSM-R网络MSC及BSS容灾方案研究

随着中国GSM-R网络规模的扩大和核心网的逐步建成,MSC、BSS容灾和网络安全越来越重要。分析GSM-R MSC及BSS的设备及连接故障所产生的影响,提出容灾备份措施,研究＂双归属＂和＂MSC pool＂等方式MSC冗余备份方案,讨论基于电路割接、无线覆盖冗余等方式的MSC及BSS备份,可供GSM-R网络冗余设计和实施参考。     

Influence of driving patterns on vehicle emissions: A case study for Latin American cities

On-board real-time emission experiments were conducted on 78 light-duty vehicles in Bogota. Direct emissions of carbon monoxide (CO), carbon dioxide (CO₂), nitrogen oxides (NO_x) and hydrocarbons (HC) were measured. The relationship between such emissions and vehicle specific power (VSP) was established. The experimental matrix included both gasoline-powered and retrofit dual fuel (gasoline–natural gas) vehicles. The results confirm that VSP is an appropriate metric to obtain correlations between driving patterns and air pollutant emissions. Ninety-five percent of the time vehicles in Bogota operate in a VSP between −15.2 and 17.7 kW ton⁻¹, and 50% of the time they operate between −2.9 and 1.2 kW ton⁻¹, representing low engine-load and near-idling conditions, respectively. When engines are subjected to higher loads, pollutant emissions increase significantly. This demonstrates the relevance of reviewing smog check programs and command-and-control measures in Latin America, which are widely based on static (i.e., idling) emissions testing. The effect of different driving patterns on the city’s emissions inventory was determined using VSP and numerical simulations. For example, improving vehicle flow and reducing sudden and frequent accelerations could curb annual emissions in Bogota by up to 12% for CO₂, 13% for CO and HC, and 24% for NO_x. This also represents possible fuel consumption savings of between 35 and 85 million gallons per year and total potential economic benefits of up to 1400 million dollars per year.     

钢质机动管线穿越水域铺设

介绍了钢质机动管线穿越水域铺设的几种形式和所用器材,分析了不同穿越形式的优缺点、水面穿越设备穿越河流时所呈现的“水平悬管”的受力状况,提出了不同穿越形式具体的铺设及适用条件,可供钢质机动管线水域穿越施工时参考。