地铁民用通信系统资源经营管理模式研究

地铁民用通信系统在满足乘客在地下空间的通信信息需求,为司机、设备维修人员及站务调度等人员提供必要替换通信手段方面,发挥着日益重要的作用。本文通过分析目前我国地铁民用通信系统投资建设、经营管理、维护改造等模式的关键影响因素,对地铁民用通信系统信息平台的统筹经营运作提供了参考借鉴及合理化建议。     

光环通信平台在道路监控系统中的应用

文章针对高速公路上监控外场信号采集和传输遇到的问题,提出基于光环通信平台的解决方案,并分析了光环通信平台的优点与不足,为光环通信平台在高速公路监控领域里的应用提供参考.     

交通移动应急通信指挥平台标准体系构建思路

日前,交通运输部已组织开展全国范围内的交通移动应急平台建设,遵循统一标准、统一规范、统一建设、统一运维的原则。为达到本标准体系的时效性和实用性,必须充分考虑交通行业建设移动应急通信指挥平台的实际需求和当前现状,并借鉴其他行业的建设经验。在此基础上,构建符合交通行业特色和社会发展、与其他行业应急平台和国家应急平台相协调的交通移动应急通信指挥平台标准体系。同时,该体系应兼顾日常使用和突发状况使用,具有可持续行和可操作性。1相关标准建设现状当前国家及各部门、各行业正在抓紧建设应急处置体     

深圳市公安局3G视频报警项目案例分析

随着通信技术的发展,通信终端信息交互方式由传统语音交互发展到了音视频多媒体交互方式,特别是3G技术出现后,可视电话越来越普及。对于公安系统,如何提升110平台功能,实现视频交互式报警,提高接处警水平,更好服务于市民成为110系统信息化改造的一个重要任务。深圳市公安局指挥中心抓住时机,联合深圳联通启动了110平台改造升级项目,系统增加了3G视频报警渠道,可快速定位报案位置,并通过手机视频直观了解事发地点情况,从而快速对案情做出处理方案,提升     

政策支持 市场化运作——江西云南积极推进道路运输GPS管理系统建设

为了了解江西、云南两省GPS的运营管理情况,2011年11月,湖北省道路运输协会组织人员分别赴江西、云南两省学习考察,从相关政策、运行模式、运行机制、运行评价、资金投入及后续保障等方面进行了参观学习。两省GPS追根溯源云南省GPS管理系统建立的起因,始于2005年该省连续发生13起10人以上的重特大事故。为遏制事故的再度发生,提高安全系数,该省运管局研究提出了运用高科技手段对营运班车、旅游客车及危货车辆实行动态监管的方案。采取大集中的模式进行组建,即:省运管局负责建设中心平台(GPS管理中心),统一终端设备招标,统一运营商管理,统一通信资费谈判和通信卡的领取发放,统一服     

刘建:完善检测标准 达成联网联控

联网联控建设已逾十年。各地相继建设了监管、监控平台,但是由于平台缺乏统一标准,导致平台间不能联通,接口不统一,信息无法共享,主管部门无法对外界车辆实施有效监控,存在较大的安全隐患。近期,中国交通通信信息中心卫星导航中心主任刘建向记者盘点了他们近年来在全国重点营运车辆联网联控上所做的工作,介绍了"重点运输过程监控管理服务示范工程",他们要做的具体工作包括五大方面:建立联网联控的运     

深圳市公安局3G视频报警项目案例分析

随着通信技术的发展，通信终端信息交互方式由传统语音交互发展到了音视频多媒体交互方式，特别是3G技术出现后，可视电话越来越普及。对于公安系统，如何提升110平台功能，实现视频交互式报警，提高接处警水平，更好服务于市民成为110系统信息化改造的一个重要任务。深圳市公安局指挥中心抓住时机，联合深圳联通启动了110平台改造升级项目，系统增加了3G视频报警渠道，可快速定位报案位置，并通过手机视频直观了解事发地点情况，从而快速对案情做出处理方案，     

保障铁路通信信号安全传输的有效措施

随着科学技术的不断发展,我国现代铁路通信信号传输技术也逐步向着智能化、网络化和数字化方向发展。现代通信技术及计算机技术在铁路通信信号安全传输技术中的应用实现了铁路通信信号一体化。本文就现代铁路通信信号安全传输技术的应用进行探讨和分析。     

乌北物流平台系统在节能减排中的应用

2009年,新疆生产建设兵团通信科技中心有限公司对新疆的货运市场现状进行了深入调研,发现存在车货信息沟通不畅、车辆和货物安全监控不及时等问题。鉴于以上情况,建立了以GPS卫星定位为基础的物流信息平台,实现信息收集发布、运输车辆监控等服务功能,旨在借助于计算机和网络信息技术,使货主、车主、中介等要素有效的聚集在平台上进行交易,减少由于运输组织无序和配载水平低下所造成的社会资源浪费,实现了车货对接,缩短了配货时间,提高了运输效率,达到节能减排的目的。     

用于地铁直流供电运行维护的综合保护装置检测平台

为有效保证地铁供电系统的可靠性与安全性,提高供电系统检测效率与质量,同时降低测试工作的复杂性,设计一套适用于地铁直流供电运行维护的综合保护装置检测平台。一方面,明确综合保护装置检测功能定位,提出设计保护功能模块、输入/输出模块、数据记录与分析模块、连接与通信模块等。另一方面,阐释检测平台的主要功能及实现,包括保护跳闸功能与重合闸闭锁、模拟故障排除与联跳失灵故障、大电流脱扣测试与直流小车断路器测试等,以期为地铁直流供电系统的检测与维护提供有益参考,促进地铁交通的可靠、稳定运行。     

Assessment of stratospheric fuel burn by civil commercial aviation

When jetliners fly in the stratosphere, their emissions tend to be longer-lived and therefore have greater environmental impact. Since the altitude of the tropopause is not consistent and can be as low as 23,000 ft., cruising flights may have a great chance to fly into the stratosphere. In this paper, we present a simple and rapid method to estimate the extent of US commercial passenger and cargo flight that currently occurs in the stratosphere, based on publicly available historical data from 2008 to 2012. We model the vertical profile of a flight and compare it with the height of the tropopause along its route. Our analysis covers 78% of the total travelled distance reported by the United States Bureau of Transportation Statistics, and shows that these flights burnt ∼11 million tons of fuel annually, or ∼31% of cruise fuel, in the stratosphere between 2008 and 2012. Our results also show that the chance of flying into stratosphere varies by area, but flights within the contiguous United States tend to stay below the stratosphere. Moreover, the stratosphere fuel burn of Asia-US flights may be significantly reduced by taking jet stream routes.     

广西英越双外语交通类人才培养初探

文章结合广西交通系统参与越南交通基础设施建设的实际情况,分析了双方合作中存在的问题,提出利用广西交通职业技术学院为平台,培养掌握专业知识和英语、越南语双外语的交通人才的思路.     

Development of a simulation platform for safety impact analysis considering vehicle dynamics,sensor errors,and communication latencies: Assessing cooperative adaptive cruise control under cyber attack

While safety is one of the most critical contributions of Cooperative Adaptive Cruise Control (CACC), it is impractical to assess such impacts in a real world. Even with simulation, many factors including vehicle dynamics, sensor errors, automated vehicle control algorithms and crash severity need to be properly modeled. In this paper, a simulation platform is proposed which explicitly features: (i) vehicle dynamics; (ii) sensor errors and communication delays; (iii) compatibility with CACC controllers; (iv) state-of-the-art predecessor leader following (PLF) based cooperative adaptive cruise control (CACC) controller; and (v) ability to quantify crash severity and CACC stability. The proposed simulation platform evaluated the CACC performance under normal and cybersecurity attack scenarios using speed variation, headway ratio, and injury probability. The first two measures of effectiveness (MOEs) represent the stability of CACC platoon while the injury probability quantifies the severity of a crash. The proposed platform can evaluate the safety performance of CACC controllers of interest under various paroxysmal or extreme events. It is particularly useful when traditional empirical driver models are not applicable. Such situations include, but are not limited to, cyber-attacks, sensor failures, and heterogeneous traffic conditions. The proposed platform is validated against data collected from real field tests and tested under various cyber-attack scenarios.     

Intelligent computing methods in Air Traffic Flow Management

This research presents the application of intelligent computing models in Air Traffic Flow Management (ATFM). Firstly, multi-agent system in grid computing environment is applied to deal with the problem of ATFM synchronization. The developed system consists of software agents, which are implemented in a Computational Grid platform for congestions identification, conflicts resolution and agreements negotiation among the participating airports. A metric criterion, called Agent’s Balancing Standard (ABS), is used as a basic index to measure the effectiveness of reducing both the amount of communication among agents and the delay of flights. Secondly, a brief discussion about the Meta-Level Control model is introduced in ATFM issues to improve the efficiency of communication among the agents. The system is developed to analyze the traffic flow information received, identify its importance and process it in the most adequate order.     

Tweeting Transit: An examination of social media strategies for transport information management during a large event

Social media platforms are seeing increasing adoption by public transport agencies, as they provide a cost-effective, reliable, and timely mechanism for sharing information with passengers and other travellers. In this paper, we use a case study of the @GamesTravel2014 Twitter account to evaluate how this social media platform was used over the course of the 2014 Commonwealth Games in Glasgow, Scotland to provide and share transport-related information and respond to information requests. The case study provides an exemplar for the public co-ordination of information from multiple partners in a complex environment during a time of transport disruption. We evaluate both the structure and intent of the @GamesTravel2014 social media strategy via interviews with involved parties and an analysis of Tweets related to the account. Findings indicate the potential for future applications of social media by transport operators and authorities in producing a more effective network of communication with passengers.     

Percolation phenomenon in connected vehicle network through a multi-agent approach: Mobility benefits and market penetration

This paper presents an integrated multi-agent approach, coupled with percolation theory and network science, to measure the mobility impacts (i.e., mean travel time of the system) of connected vehicle (CVtio) network at varying levels of market penetration rate. We capture the characteristics of a CV network, i.e., node degree distribution, vehicular clustering, and giant component size to verify the existence of percolation phenomenon, and further connect the emergence of mobility benefits to the percolation phase transition in the CV network. We show the percolation phase transition properties to appear in a dynamic CV network with time-correlated link and node dynamics. An analytical framework was developed to evaluate the CV network attributes with varying market penetrations (MP) and connection ranges (CR) to identify percolation phenomenon in a mixed CV and Non-CV environment. In addition, a multi-agent CV simulation platform was created to further measure (1) how varying MPs and CRs affect the network-wide mobility measured by the mean travel time of the network; and (2) when percolation transition occurs in CV network to capture the critical MP and CR. Percolation phenomenon in CV network was further validated with the analytical assessments. The results show that (1) percolation phase transition phenomenon is a function of both market penetration and communication range; (2) percolation phase transitions in both mobility and CV network are highly correlated; (3) the application can reduce the average travel time of the system by up to 20% with reasonable market penetration and communication range; (4) critical market penetration is sensitive to communication range, and vice versa; (5) at least 70% of the CVs on the network are required to show in the same cluster for mobility benefits to appear; and (6) for high levels of MP or CR, a low probability of connectivity (PC) does not dramatically change the mean travel time. These results provide solid supports to create evidence-driven frameworks to guide future CV deployment and CV network analysis.     

基于移动智能终端的云环境交通平台研究

由基于移动智能终端的云环境交通平台进行的交通调查是一种新型的交通数据收集手段。文章介绍了基于移动智能终端的云环境交通平台技术的应用领域、使用方法及效果,并结合该平台总体设计方案,分析了该平台技术研究所取得的创新性成果。     

百色物流公共信息平台建设的探讨

文章阐述建设百色市物流公共信息平台的必要性,分析构建百色市物流公共信息平台的现状及面临的问题,提出百色市物流公共信息平台建设的保障措施。     

轨道交通车站站台安全门的受力分析

针对轨道交通车站站台安全门承受的载荷以及如何进行载荷组合等问题,从载荷、风压、温度等方面分析了安全门的受力情况,详细介绍了安全门承载能力极限状态验算的几种方式。