The use of GIS and relational database management systems to improve the scheduling operations of paratransit

The scheduling operations of many paratransit agencies in the United States are undertaken manually. Those customers who are eligible to travel call in their requests the day before the trip is needed. As the trip requests are received, they are entered into a list of unscheduled trips. In order to schedule these trips, the scheduler must first determine the number of drivers and shuttle buses that are available as well as the time of availability of each. The scheduler must then try to match the rides that are in “similar” areas around the “same” time to place together on the driver's schedule. As new trip requests are made, the schedulers must adjust the trips that are already scheduled to try and schedule as many trips as possible in the most efficient way.

By developing a system that would improve the scheduling system operations of, in this case, DART (Delaware Administration for Regional Transit) First State Paratransit, customers can expect to receive better service that will improve their ability to travel throughout the community. Some devices that could also improve the operations of paratransit agencies are described in this paper, such as satellite‐based Global Positioning System (GPS), radio communication systems, mobile computers, radio frequency‐based data communication systems, internet web pages, automated paratransit information systems, and card‐based data storage and transfer media. However, because paratransit systems are difficult to operate cost‐efficiently, the optimum and most cost‐efficient device must be selected. The system chosen for DART First State Paratransit includes the use of a relational database management system (RDMS) and a transportation Geographic Information System (GIS). RDMS keeps track of the database information as well as the scheduled trips and the GIS is ideal for analyzing both geographic and temporal data. This system is shown to be superior to the manual system.     

What transportation modeling needs from a GIS: a conceptual framework

Both the geographic information system (GIS) and transportation modeling environments have seen continually developing analytic concepts and techniques. However, these developments have seldom resulted in the integration of GISs and transportation models. This paper explores the potential inherent in merging of these environments through a systematic investigation of the fundamental basis of integration. To do this, the traditional four step transportation modeling process is extended to include input and output steps. We then define functional components for GIS data handling — data management, manipulation, and analysis. The steps of modeling are matched against the list of GIS data handling functions within a matrix‐based framework. GIS functions that enhance a land‐use based urban transportation modeling process are then categorized. Conclusions are drawn and directions for future developments are discussed.     

基于交叉感应环线的列车控制系统地面发送设备

本文介绍了基于交叉感应环线的列车控制系统地面发送设备的原理及安全性，对发送设备的各个功能模块进行了详细的说明。     

认真落实“高标准、讲科学、不懈怠”要求全面推进铁路信息化工作

按照＂高标准、讲科学、不懈怠＂的要求,本文提出了到2012年铁路信息化实现的目标和重点推进的10个方面工作以及构建铁路网络与信息安全保障体系、建立铁路信息系统运行维护机制、造就铁路信息化人才队伍的途径,旨在全面提升铁路信息化工作科学化水平,为建设和谐铁路、实现铁路现代化提供强有力的技术支撑和保障。     

Optimization models to characterize the broadcast capacity of vehicular ad hoc networks

Broadcast capacity of the entire network is one of the fundamental properties of vehicular ad hoc networks (VANETs). It measures how efficiently the information can be transmitted in the network and usually it is limited by the interference between the concurrent transmissions in the physical layer of the network. This study defines the broadcast capacity of vehicular ad hoc network as the maximum successful concurrent transmissions. In other words, we measure the maximum number of packets which can be transmitted in a VANET simultaneously, which characterizes how fast a new message such as a traffic incident can be transmitted in a VANET. Integer programming (IP) models are first developed to explore the maximum number of successful receiving nodes as well as the maximum number of transmitting nodes in a VANET. The models embed an traffic flow model in the optimization problem. Since IP model cannot be efficiently solved as the network size increases, this study develops a statistical model to predict the network capacity based on the significant parameters in the transportation and communication networks. MITSIMLab is used to generate the necessary traffic flow data. Response surface method and linear regression technologies are applied to build the statistical models. Thus, this paper brings together an array of tools to solve the broadcast capacity problem in VANETs. The proposed methodology provides an efficient approach to estimate the performance of a VANET in real-time, which will impact the efficacy of travel decision making.     

未来的海上信息战

信息对于战争的重要性是举足轻重的,随着通信技术和计算机网络技术的发展,信息系统已成为军事目标,本文阐述了悄然兴起的信息战及有关概念,详细论述了网络中心战及有关问题,未来海上战场将采用先进的联网技术把作战部队和作战平台等联系起来,以获取信息优势,形成综合战斗力,从而赢得信息时代的战争。     

集装箱车辆跟踪和管理

叙述对集装箱车辆跟踪和管理的重要性,介绍实现集装箱车辆跟踪和管理的方法,以及采用3G（GPS、GIS、GSM）高新技术开发而成的集装箱车辆跟踪和管理系统,最后展示应用实例。     

汽车中控系统智能化发展研究

近年来,随着软件价值在整车中不断扩大,软件定义汽车的趋势也逐渐变为现实.然而由于安全的原因,导致车载软件发展相对迟缓.2014年,我国就将"智能网联汽车"纳入工信部发展规划之中,以数据驱动的车载软件正在成为定义汽车的显著特征.文章依托汽车智能化发展趋势,以汽车中控作为研究重点对象,针对其发展进程、电子电气架构、车载OS...     

套料板信息自动标识系统的开发与应用

套料是船舶生产设计中必不可少的工序之一,套料板上信息标识的正确与否直接影响着后续工序的开展。本文通过分析船厂现有套料板标识模式,指出了现有标识模式的不足,利用Python语言对Tribon进行二次开发,开发出套料板信息自动化标识系统,实现套料板零件信息的自动化标识。自动化标识系统的使用提高了生产设计效率,为后续工作的开展提供了便利。     

医院药品管理系统设计与实现

医院信息系统(HIS)是计算机应用领域的一个热点,在分析了目前流行的信息系统体系结构的基础上,提出了HIS体系结构的设计。药品管理系统是HIS的重要组成部分,在对其进行分析和设计的基础上,根据东风汽车公司花果医院的现实情况,开发了一个实例系统,取得了良好效果。