综合布线系统及其应用

本文结合海润国际住宅综合布线工程阐述了综合布线系统的组成及应用,介绍了综合布线铜缆系统的现状及发展方向。     

数字集群共网智能网组网设计方案的研究

本文研究分析了数字集群共网智能网组网设计方案及考虑原则，包括业务需求分析、用户预测和组网方案，并探讨网络规模和容量设计等关键的技术问题和需要重点考虑的内容。     

基于车载信息采集平台的智能交通系统实现方式

本文介绍了智能交通系统特点和发展,分析了车载信息采集平台的软件结构设计,提出了设计信息采集平台的基本功能要求和建立方式,进而讨论了智能交通系统的功能实现过程和运行情况.     

车辆安全行驶智能系统设想

笔者针对车辆的不安全行驶所造成的大量道路交通事故现象,从智能交通系统的概念和交通人机系统的原理出发,设想了车辆安全行驶智能系统,以实现对车辆超速、行驶稳定性、跟车、超车等行为的智能预警与控制.     

一种智能四驱控制的CRUISE仿真及应用

智能四驱是目前SUV车型发展的趋势,如何对该整车模型建模及性能仿真显得尤其重要。文章根据一款SUV车型物理结构及所采用的控制策略进行分析,采用CRUISE软件搭建整车性能仿真模型,并通过试验结果对其动力性经济性进行验证。表明,常用工况中,智能四驱仿真结果与两驱模式下性能基本一致,提供了一种比较行之有效的整车性能匹配的分析方法。     

Towards data-driven car-following models

Car following models have been studied with many diverse approaches for decades. Nowadays, technological advances have significantly improved our traffic data collection capabilities. Conventional car following models rely on mathematical formulas and are derived from traffic flow theory; a property that often makes them more restrictive. On the other hand, data-driven approaches are more flexible and allow the incorporation of additional information to the model; however, they may not provide as much insight into traffic flow theory as the traditional models. In this research, an innovative methodological framework based on a data-driven approach is proposed for the estimation of car-following models, suitable for incorporation into microscopic traffic simulation models. An existing technique, i.e. locally weighted regression (loess), is defined through an optimization problem and is employed in a novel way. The proposed methodology is demonstrated using data collected from a sequence of instrumented vehicles in Naples, Italy. Gipps’ model, one of the most extensively used car-following models, is calibrated against the same data and used as a reference benchmark. Optimization issues are raised in both cases. The obtained results suggest that data-driven car-following models could be a promising research direction.     

基于BIM技术的轨道交通桥梁工程量计算

为了解决轨道交通桥梁工程数量计算中存在的工程量信息传递次数多、效率不高等问题,提出一种基于结构化数据的工程量计算方式,省去了基于二维图纸进行工程量计算方式中的信息传递过程,避免了三维模型成熟度不高或信息缺失造成的数量丢失。具体做法为:采用数量项类型划分、分类计算、混合方式编码等方法,建立构件与工程数量、工程数量与清单的映射关系,可跳过图纸或模型进行工程量计算和工程量清单的输出。在智能京张BIM设计过程中,通过编写桥梁工程数量计算软件进行工程数量的计算和输出,验证了该方法的可行性。     

Extending Time to Collision for probabilistic reasoning in general traffic scenarios

Vehicle-to-vehicle communication systems allow vehicles to share state information with one another to improve safety and efficiency of transportation networks. One of the key applications of such a system is in the prediction and avoidance of collisions between vehicles. If a method to do this is to succeed it must be robust to measurement uncertainty and to loss of communication links. The method should also be general enough that it does not rely on constraints on vehicle motion for the accuracy of its predictions. It should work for all interactions between vehicles and not just a select subset. This paper presents a method to calculate Time to Collision for unconstrained vehicle motion. This metric is gated using a novel technique based on relative vehicle motion that we call “looming”. Finally, these ideas are integrated into a probabilistic framework that accounts for uncertainty in vehicle state and loss of vehicle-to-vehicle communication. Together this work represents a new way of considering vehicle collision estimation. These algorithms are validated on data collected from real world vehicle trials.     

一种基于视频虚拟检测线的交通流参数检测方法

实时交通流参数检测在智能交通系统中起着重要的作用。参数检测有多种方式,其中基于图像处理的视频车辆检测方式近年来发展很快,由于它具有检测区域大、系统设置灵活等突出的优点,已成为智能交通系统领域的一个研究热点。车辆的检测基于车道,在每个车道设置两条虚拟检测线来检测交通流参数,虚拟检测线的作用类似于电磁感应线圈。系统通过对视频虚拟检测线的预处理将二维的数字图像转化成一维的检测信号,减小了运算量,降低了运算负荷。提出的基于视频虚拟检测线特征的交通流参数检测系统已经在PC机上用VC 6.0实现,并对不同典型天气条件下的交通流视频进行了实验,实验结果表明该系统具有较高的车流量统计精度。