基于GPS和GPRS的摩托车道路试验监控系统研究

基于GPS和GPRS技术实现的摩托车道路试验监控系统,综合运用了地理信息系统、网络技术及多媒体技术等,可用来指导驾驶员按照一定要求开展试验,同时采集试验中摩托车的各种状态参数,对试验进行调度和监控,具有传输距离长、传输速度快等优点,不受试验场地限制,经试验验证,系统稳定可靠,可以满足摩托车道路试验需求。     

GPS一机多天线技术在公路边坡灾害监测中的应用研究

文章主要介绍了GPS一机多天线监测系统及其在公路边坡变形监测中的实际应用情况,通过实践可以证明:GPS一机多天线监测系统的定位精度可以达到3～5mm,与常规的GPS静态相对定位的精度相当,同时能够大大降低GPS监测系统的成本,使得公路边坡灾害监测能够实现高精度、自动化和全天候等目标。     

机务管理信息系统的分析与运用

详细地对机务管理信息系统进行了分析，指出了系统运行环境和主要技术功能，为机务管理部门进行现代化管理提供了很好的借鉴。     

关于南京市街巷路整治的反思

本文阐述南京市街巷支路整治中存在的问题及其对策     

Sharing costs in Swedish road ownership associations

Usually transport systems, and roads in particular, are viewed as public goods. However, this is not always the case. In Sweden a large part of the road system is privately owned. Most of these privately owned roads are rural roads used by farmers and summer cottage owners, or used for forest transport. These roads are mainly provided by ownership associations.An important difference between public roads and these privately owned roads is that all investments- and maintenance decisions are made by the users themselves, who also have to pay the costs, whereas the usual case is that the owners/providers of a road-system are different agents than the users. Here the question is not how to charge the roads but how to split the costs of the roads among the users in an efficient and “fair” way.The motivation of this paper is the practical problem of how such an ownership association can divide the costs for the road network among the members in an efficient and “fair” way. The problem is treated from a game theoretical point of view, making use of the Shapley value. This means that the problem is associated with a game - a mathematical representation of the conflict situation. The Shapley value is a very important solution concept for cooperative games, like the game in this case. For games corresponding to this specific type of problems, it is shown that the Shapley value has excellent properties, such as beeing an element of the core, and beeing very easy to compute.     

变配电所电力试验自动检测管理系统的研制

从目前路内电力试验的现状入手,阐述了建立变配电所电力试验自动检测管理系统的目的,从自动检测和数据管理2个方面详细介绍了该系统的构成、功能、采用的关键技术、主要特点及在电力试验中的具体应用情况。     

轻型货车轮胎接地压力分布实测

利用自主开发的轮胎接地压力测试仪,进行了轻型货车不同花纹和不同使用年限轮胎,在不同轮胎胎压和不同负荷作用下,轮胎的接地压力分布规律测量。实测结果发现:轻型货车轮胎与路面的接触形状更接近于矩形;新胎比旧胎的接地压力要均匀些;轮胎胎压与平均接地压力、轮胎负荷与平均接地压力、轮胎负荷与有效接地面积基本上呈线性关系。     

沥青混合料集料的分形级配研究

沥青混合料具有复杂的微观结构,是一种多级多层次的复合材料体系。文章采用分形几何的方法对沥青混合料的级配进行研究,并以AC-20和SMA-20为例,在现行规范级配曲线范围内选取了6组级配,通过回归分析和计算,得到了每种级配集料的分形维数。     

道路运输市场退出机制研究

道路运输市场退出机制与道路运输市场准入制度相辅相成,不可分割。文章阐述了道路运输市场退出机制的基本特点、重要作用、主要方式及实施程序,并对其在实施过程中存在的问题进行讨论。     

Generating lane-based intersection maps from crowdsourcing big trace data

Lane-based road information plays a critical role in transportation systems, a lane-based intersection map is the most important component in a detailed road map of the transportation infrastructure. Researchers have developed various algorithms to detect the spatial layout of intersections based on sensor data such as high-definition images/videos, laser point cloud data, and GPS traces, which can recognize intersections and road segments; however, most approaches do not automatically generate Lane-based Intersection Maps (LIMs). The objective of our study is to generate LIMs automatically from crowdsourced big trace data using a multi-hierarchy feature extraction strategy. The LIM automatic generation method proposed in this paper consists of the initial recognition of road intersections, intersection layout detection, and lane-based intersection map-generation. The initial recognition process identifies intersection and non-intersection areas using spatial clustering algorithms based on the similarity of angle and distance. The intersection layout is composed of exit and entry points, obtained by combining trajectory integration algorithms and turn rules at road intersections. The LIM generation step is finally derived from the intersection layout detection results and lane-based road information, based on geometric matching algorithms. The effectiveness of our proposed LIM generation method is demonstrated using crowdsourced vehicle traces. Additional comparisons and analysis are also conducted to confirm recognition results. Experiments show that the proposed method saves time and facilitates LIM refinement from crowdsourced traces more efficiently than methods based on other types of sensor data.