CTCS-3级列控系统安全数据网分析

针对CTCS-3级列控系统安全数据网络,研究了信号系统安全数据网功能、信息传输、组网结构和网络安全防护措施。     

兰州市交通拥堵分析及缓解对策研究

该文针对兰州市经常拥堵的交通局面,分析了造成兰州市交通拥堵的8个方面的原因,进而提出了缓解兰州市交通拥堵的8个方面的对策。这些缓堵对策不仅对兰州市的城市建设具有指导意义,对其他城市也具有参考价值。     

航运企业安全文化建设

就建立航运企业安全文化的必要性、重要性进行了综述,结合我国航运企业的实际情况,对企业安全文化的构建、完善与实施进行了剖析。航运企业安全文化是企业管理模式、管理理念与企业文化的结晶,是船舶航行安全的保障。     

基于MVC的空间分析服务模型框架及其应用

针对铁路地理信息应用的专业化、需求分散、系统多元化等特点,提出基于MVC模式的空间分析服务模型框架。模型框架结构分为数据层、应用服务层和视图层。将空间分析的功能独立出来,为其他的系统和功能提供形式多样的空间数据分析服务。模型框架在物理上以分布式组件技术作为其实现技术。把铁路各种形式多样的应用划分为用户视图、空间模型和控制器。在该框架上实现基于沪宁线综合安全监测信息的车辆追踪的应用。     

影响中国沿海雾中航行的环境因素及对策

该文对影响中国沿海雾中航行的环境因素进行了分析研究，提出了改善中国沿海航行环境的基本对策以及中国沿海雾中航行注意事项。对于保证船舶雾中航行安全，防止事故发生，具有重要意义。     

昆山南站站房改造工程对既有高铁桥梁安全影响分析

结合昆山南高架站站房改造工程,通过ABAQUS软件建立有限元实体分析模型,研究新建结构物对邻近高铁桥梁桥墩、基础承载力、变形的影响。通过数值分析,得出以下结论:(1)昆山南站新增建筑结构建成后,既有高铁桥墩墩身承载力、局部应力仍满足规范要求;(2)新建桩基从施工到上部荷载加载过程中,对邻近高铁桥既有桩基的摩阻力、剪力和弯矩影响不大,对桩身轴力,上部荷载加载后则有明显增加。桥墩发生向新增建筑区域倾倒的变形趋势,但桥墩墩顶水平位移和竖向沉降的变化值不大于控制限值1 mm;(3)水泥搅拌桩对地基有加固作用,但其施工时会对桥梁桩基产生不利影响,应保证搅拌桩与桥墩桩基有一定安全距离。     

山区铁路小半径曲线钢轨伤损分析

通过分析管内线路自上一轮大修和鹰厦线电化后运营电力机车以来 ,钢轨特别是小半径曲线地段钢轨的伤损、磨耗变化及其变化规律 ,探寻其产生原因 ,针对存在问题 ,探索相应对策措施。     

中山市中心城区对外交通现状分析及对策研究

中山市的交通运输主要依靠公路和水运两种方式。本文对中山市中心城区对外交通的方式之一 ,即 :道路交通进行分析研究 ,并提出改善措施。     

Factors contributing to the severity of intersection crashes

Road crashes are a leading cause of death and serious injuries both developed and developing countries. Intersections are recognized as being among the most hazardous locations on the roads. Although crashes at intersections form about 35 % of the reported accidents account for about 32% of traffic‐related serious injuries and fatalities in Singapore, there is no known study that examines the factors contributing to the severity of these crashes. In this study, the ordinal probit model was applied to crash data from 1992 to 2002 to investigate the role a variety of factors play in determining the severity of intersection crashes. Our study shows that vehicle type, road type, collision type, driver's characteristics and time of day are important determinants of the severity of crashes at intersections in Singapore.     

Safety-based path finding in urban areas for older drivers and bicyclists

This paper presents a safety-based path finding methodology for older drivers and bicyclists in an urban area. The paths are estimated based on costs consisting of both safety and travel time. Safety is evaluated against potential risk of a crash involving an older driver (or a bicyclist) with other vehicles present on the road. To accomplish this, simple formulations are developed for safety indicators of streets and intersections, which are actually generic irrespective of the type of road user. Traffic attributes such as speed and density, driver attributes such as perception-reaction time and street attributes of length and tire-to-road friction coefficient are taken into account in building the safety indicators. Thus, the safety indicators do not necessarily require historical crash data which may or may not be available during path finding. Subsequently, a multi-objective shortest path algorithm is presented that identifies the best path (the non-inferior path) from amongst a set of selected safest paths with due considerations to travel time incurred on each. A simple application example of the proposed methodology is demonstrated on an existing street network system from the City of College Station, Texas. The contributions of this research are twofold – first, the safety indicators can be used by planners in determining high crash potential sites – streets and/or intersections – and second, the safety-based path finding methodology developed in this paper can be integrated with modern day route planning devices and tools in guiding older drivers and bicyclists within an Intelligent Transportation Systems framework.