基于模具设计与制造专业“双证书”课程的研究与实践

双证融通是职业教育的本质要求,本文通过模具设计与制造专业工作过程分析与职业资格证书标准分析,将职业标准融入课程标准之中,在此基础上,提出模具设计与制造专业双证融通专业培养方案的框架体系。     

兰州铁路局探索专业化管理的新途径

铁路生产力布局调整之后,兰州铁路局在新体制、新布局下,围绕铁路跨越式发展战略,突破传统思维模式和管理理念,积极探索专业化管理的新途径及维修新体制。电务系统实施扁平化管理,以生产指挥、微机监测、视频监控三大系统为基础,零距离控制现场;全面整合检修资源,初步实现“作业流程化、检修专业化、管理现代化”。牵引供电系统探索创新符合行车设备检修需要及发展方向的维修体制,形成科学、系统、规范的设备维修体制,不断提高设备检修的质量与效率。     

Controlling road congestion via a low-complexity route reservation approach

This work introduces a novel route reservation architecture to manage road traffic within an urban area. The developed routing architecture decomposes the road infrastructure into slots in the spatial and temporal domains and for every vehicle, it makes the appropriate route reservations to avoid traffic congestion while minimizing the traveling time. Under this architecture, any road segment is admissible to be traversed only during time-slots when the accumulated reservations do not exceed its critical density. A road-side unit keeps track of all reservations which are subsequently used to solve the routing problem for each vehicle. Through this routing mechanism, vehicles can either be delayed at their origin or are routed through longer but non-congested routes such that their traveling time is minimized. In this work, the proposed architecture is presented and the resulting route reservation problem is mathematically formulated. Through a complexity analysis of the routing problem, it is shown that for certain cases, the problem reduces to an NP-complete problem. A heuristic solution to the problem is also proposed and is used to conduct realistic simulations across a particular region of the San Francisco area, demonstrating the promising gains of the proposed solution to alleviate traffic congestion.     

通信中间件技术在新一代CTC系统中的应用

新一代CTC系统综合了计算机技术、网络通信技术和现代控制技术,采用智能化分散自律设计原则.整个系统通常存在多种硬件系统平台,如工业控制机、工作站、小型机等,不同的操作系统及不同的网络协议和体系结构,如何把这些系统集成起来并开发新的应用是一个非常现实而困难的问题.为此,从安全性、可靠性、扩充性、易管理性、可用性和可移植性等综合因素考虑,提出了采取中间件的方式完成跨平台通信机制.     

Wi-Fi和无线PBX技术在铁路应急通信中的应用

铁路应急通信系统要求接入设备在应急现场提供无线话音通信功能,通常该功能有Wi-Fi和无线PBX两种实现方式,介绍2种方式的实现原理和各自的优势和不足。     

越南球也-宁平高速公路机电系统设计

球也-宁平高速公路是越南第一条具有完整机电系统的高速公路。文章主要介绍了越南球也-宁平高速公路收费、监控、通信系统的概况,分析了该系统与广西高速公路机电系统间的不同之处。     

地铁通号电源合并方案的探讨

针对地铁通信、信号电源系统的实际情况,提出了电源系统合并设置的方案及优缺点。     

河南省高速公路通信系统设计

介绍河南省高速公路联网收费通信系统设计.高速公路通信系统构架,详细介绍通信系统的构成及各个子系统方案.     

Study on the framework of hybrid collision warning system using loop detectors and vehicle information

Safety warning systems generally operate based on information from sensors attached to individual vehicles. Various types of data used for collision risk calculation can be categorized into two types, microscopic or macroscopic, depending on how the sensors collect the information of traffic state. Most collision warning systems use only either of these types of data, but they all have limitations imposed by the data, such as requirement of high installation cost and high market penetration rate of devices. In order to overcome these limits, we propose a collision warning system that utilizes the integrated information of macroscopic data and microscopic data, from loop detectors and smartphones respectively. The proposed system is evaluated by simulating a real vehicle trip based on the NGSIM data. We compare the results against collision warning systems based on macroscopic data from infrastructure and microscopic data from Vehicle-to-Vehicle information. The analysis of three systems shows two findings that (a) ICWS (Infrastructure-based Collision Warning System) is inadequate for immediate collision warning system and (b) VCWS (V2V communication based Collision Warning System) and HCWS (Hybrid Collision Warning System) produce collision warning at very similar timing, even with different behavior of individual drivers. Advantages of HCWS are that it can be directly applied to existing system with small additional cost, because data of loop detector are already available to be used in Korea and smartphones are widely spread. Also, the computation power distributed to each individual smartphone greatly increases the efficiency of the system by distributing the computation resources and load.     

高速铁路通信工程施工质量验收标准解读

新修订的《高速铁路通信工程施工质量验收标准》TB 10755于2018年发布,2019年2月1日正式实施。本文结合工程实际,综合考虑技术进步、管理水平发展、国家相关法律法规以及有关标准的更新等因素,总结设计、施工、监理等单位的经验,从标准修订的背景,新标准整体上的变化,以及各系统的细节变化等方面,对新验收标准进行了详细解读。