浅谈轨道交通乘客资讯系统

对轨道交通乘客信息系统(PIS)的系统组成、主要功能等进行了详细的描述,结合实践经验,对轨道交通乘客资讯系统的建设提出了几点建议.     

渝怀线信息系统工程建设管理经验初探

渝怀线信息系统工程是在铁路跨越式发展思路指导下,工程建设模式发生重大变革过程中,首次依照"同步设计、同步建设、同步开通"的新思路实现的新线信息系统工程建设项目.从工程建设管理角度回顾了工程建设过程,分析了工程建设难点,并结合信息系统与新线运营同步开通的目标,对今后铁路新线信息系统工程建设管理工作提出了有益的建议.     

客运服务综合控制系统的设计与实现

分析车站客运信息发布的现状,提出客运服务信息综合控制系统的设计目标,从功能、网络和软件结构等方面介绍系统的构成,描述系统实现过程中所采用的技术,最后对系统的技术特性、应用情况进行总结.     

计算机房接地系统的探讨

论证电子计算机房接地系统的重要性及各种接地方法.阐述不同接地之间的相互关系和接地装置的安装要求.     

角色访问控制在青藏铁路电务管理系统中的应用

用户权限管理是青藏铁路电务信息系统设计中的重要环节,是电务部门安全运行的有力保证.简要介绍基于角色的权限管理,并提出一种通用动态用户权限管理方案及实现方法.     

电子政务研究及在铁路系统的应用

通过对电子政务内涵及美国、加拿大、新加坡、英国电子政务的发展状况和我国电子政务发展的历程、现状、经验的探讨;对铁路电子政务建设的现状、必要性、建设原则进行研究;介绍铁路办公信息系统和政府网站建设的技术标准、系统功能、结构以及在实施铁路电子政务建设的安全保障措施;结合实际,探讨铁路电子政务建设需要注意的问题.     

排队论在计算城市快速公交车站停车位数量的应用

在快速公交系统设计中,需要计算合理停车位的数量,以保证公交的快速通行.分析快速公交车流到达的情况,运用排队系统理论计算车辆到达停靠站的概率,运用相关指标对不同数量停车位的使用情况进行评判,选取合理解.     

公路施工企业降低生产成本提高经济效益的对策

文章分析公路施工企业生产成本高利润率低的现状及成因,针对当前的市场环境,提出公路施工企业降低生产成本,提高经济效益的六大对策,论证提高企业管理能力和核心竞争力是改变现状的根本办法。     

Definition of a merging assistant strategy using intelligent vehicles

In the area of active traffic management, new technologies provide opportunities to improve the use of current infrastructure. Vehicles equipped with in-car communication systems are capable of exchanging messages with the infrastructure and other vehicles. This new capability offers many opportunities for traffic management. This paper presents a novel merging assistant strategy that exploits the communication capabilities of intelligent vehicles. The proposed control requires the cooperation of equipped vehicles on the main carriageway in order to create merging gaps for on-ramp vehicles released by a traffic light. The aim is to reduce disruptions to the traffic flow created by the merging vehicles. This paper focuses on the analytical formulation of the control algorithm, and the traffic flow theories used to define the strategy. The dynamics of the gap formation derived from theoretical considerations are validated using a microscopic simulation. The validation indicates that the control strategy mostly developed from macroscopic theory well approximates microscopic traffic behaviour. The results present encouraging capabilities of the system. The size and frequency of the gaps created on the main carriageway, and the space and time required for their creation are compatible with a real deployment of the system. Finally, we summarise the results of a previous study showing that the proposed merging strategy reduces the occurrence of congestion and the number of late-merging vehicles. This innovative control strategy shows the potential of using intelligent vehicles for facilitating the merging manoeuvre through use of emerging communications technologies.     

An integrated framework for assessing service efficiency and stability of rail transit systems

A well-designed service plan efficiently utilizes its infrastructure and ensures an acceptable level of service stability with consideration of potential incidents that disturb or disrupt the rail transit services. To perform service evaluation, an integrated process combining capacity, resource usage, and system reliability is required to quantify service efficiency and stability in a consistent way. This study adopts capacity-based indices, “capacity utilization” and “expected recovery time”, as the attributes for service efficiency and stability, and develops a comprehensive evaluation framework with three corresponding modules to incorporate capacity, service plan, and system reliability and maintainability simultaneously. The capacity analysis module computes the rail transit capacities under normal and degraded operations. The reliability module classifies and fits the proper reliability and maintainability distributions to the historical interruption data. The service efficiency and stability module analyzes the results of the previous two modules and evaluates the service efficiency and stability of rail transit service plans. Empirical results show that the established evaluation framework can not only evaluate the service efficiency and stability but also identify critical sections and time slots. This tool can help rail transit operators rapidly assess their operational changes and investment strategies related to efficiency and stability so as to provide efficient and stable services to their customers.