列控应答器报文可视化分析软件的设计与实现

应答器报文是实现CTCS-2级列控系统功能的关键数据。介绍了一种基于数据可视化方法分析验证应答器报文的软件——BTViewer的设计和实现,该软件为应答器报文的设计分析、现场维护提供了全新的手段和工具。     

乘客信息显示系统移动宽带传输网建设与思考

移动宽带传输网实现了乘客信息显示系统(PIDS)地面设备与车载设备之间的双向信息交换,是PIDS系统的重要组成部分。研究广州地铁1—4号线PIDS移动宽带传输网建设方案,对车-地信息传输方式进行分析,讨论几种无线传输技术,并对网络冗余设计和抗干扰进行分析。     

一种夜间采集交通信息的新方法

本文提出了一种采集夜间交通信息的新方法,即夜间对路段上的车辆进行拍照,对曝光时间内车灯留下的光柱进行分析而获取交通信息。通过3Dmax建立虚拟相机和三维虚拟空间,可以重构出实际拍摄所得的光柱的三维模型,由此我们可以获得车辆行驶的轨迹线。同时,本文从摄影测量的角度提出了解算车辆运动轨迹的另一种思路。此外,本文在该方法用于其他交通信息的提取,例如空间平均速度的计算,以及路段速度-密度曲线的获得等,做了一定的尝试。实践表明,该方法能够快捷、廉价地获得可信的交通信息。     

Eco-design of transportation in sustainable supply chain management: A DEA-like method

This study addresses the issue of eco-design for transportation in sustainable supply chain management (SSCM). Data envelopment analysis (DEA) is adopted and extended to construct a model for this application. This proposed model, together with the tractable algorithm developed in this research, can provide stakeholders with a Pareto Optimal transportation strategy. This derived transportation strategy can help stakeholders realize certain transportation goals with less resource consumption and pollution emission. The discussion presented leads to a heuristic Joint Transportation Policy and concludes with two useful suggestions for putting the strategy into practice. The proposed model was used in an empirical study of design sustainable transportation mechanism for one air-condition manufacturer in China to transport its products as well, the analysis further demonstrating the theoretical and practical value of this research.     

网络云环境下高职艺术设计改图创新模式教学与能力数据挖掘探析

文章提出运用网络云空间作为师生互动交流的通道,籍以再现经典"1对1"改图模式教学效果的教学改革路径,并运用云空间和数据挖掘技术进行设计图纸数据的积累和动态分析,有助于提升学生艺术设计能力的个性特质。     

Data Fusion-Based Traffic Density Estimation and Prediction

Traffic congestion has become a major challenge in recent years in many countries of the world. One way to alleviate congestion is to manage the traffic efficiently by applying intelligent transportation systems (ITS). One set of ITS technologies helps in diverting vehicles from congested parts of the network to alternate routes having less congestion. Congestion is often measured by traffic density, which is the number of vehicles per unit stretch of the roadway. Density, being a spatial characteristic, is difficult to measure in the field. Also, the general approach of estimating density from location-based measures may not capture the spatial variation in density. To capture the spatial variation better, density can be estimated using both location-based and spatial data sources using a data fusion approach. The present study uses a Kalman filter to fuse spatial and location-based data for the estimation of traffic density. Subsequently, the estimated data are utilized for predicting density to future time intervals using a time-series regression model. The models were estimated and validated using both field and simulated data. Both estimation and prediction models performed well, despite the challenges arising from heterogeneous traffic flow conditions prevalent in India.     

构建安全的铁路信息网络问题与对策

从网络设备、路由规划、用户隔离、防攻击、信息加密、终端安全等方面对铁路信息网络面临的各种安全问题进行了探讨。针对这些问题,作者结合实际工作提出了相应的解决方案。     

沥青路面施工质量动态管理系统研究

根据津汕高速河北段沥青路面施工过程中的动态质量管理,简要介绍了如何具体研发沥青路面施工质量动态管理系统的方法和效果.     

底盘测功机工作原理及使用

底盘测功机以其方便、安全和溯源性好等优势在汽车开发及检测工作中得到广泛应用。利用数据采集卡实现驱动力和车速的测量,通过单片机与PC机通信可实现传感器信号的采样和数据传送。文章采用底盘测功机测量驱动轮输出功率来换算发动机功率,分析驱动轮输出功率不足的原因并得出底盘的技术状况。底盘测功机可用以模拟汽车在实际行驶时的阻力、测定汽车的使用性能、检测汽车的技术状况以及诊断汽车故障。     

Integrating GIS concepts into transportation network data structures

Transportation network data structures must be designed to meet the requirements of the analyses being conducted and must be compatible with the selected graphical user interface. Increasing interest in geographic information systems (GIS) and intelligent transportation systems (ITS) have further burdened the network data structure. It is possible to implement object oriented programming (OOP) technology to satisfy these needs, without making the data structure excessively complicated.

This paper shows how a well‐developed network data structure can incorporate major capabilities normally associated with stand‐alone GIS's. The design of a network data structure derives from both theoretical and practical considerations. A design of a network data structure, composed entirely of objects, is presented. Examples of its implementation, limitations, advantages, and possible extensions are drawn from experience with the General Network Editor (GNE).