ATCA在信号产品中的应用

ATCA是PICMG组织定义的高级电信计算机架构，它采用了可变的冗余设计手段，体现高可靠性和高可用性特点。首先分析了ATCA的特征，并介绍其作为信号产品之一的CTCS．3级列控系统无线闭塞中心硬件平台的应用成果。     

城市轨道交通轨道曲线超高计算及其程序实现

城市轨道交通存在着线路条件复杂、车辆变速较快、运营模式多样等特点,导致轨道曲线超高设计面临着诸多不同的复杂工况。在总结超高计算原则及超高要素限值的基础上,探讨单一速度模式、多种速度模式、缓和曲线进入有效站台等不同工况下超高计算方法并实现计算程序化,结论为:根据不同工况合理选择超高要素限值,单一速度模式宜采用平均速度法,多种速度模式宜采用优化的接近高速法,缓和曲线进入有效站台应以站台端部超高不大于15 mm作为限制条件,采用计算机语言实现超高计算程序化可有效提高设计效率。     

改进型EDF算法在计算机联锁全电子执行单元中的应用研究

针对计算机联锁全电子执行单元的安全性、可靠性、大数据量传输的要求,结合CAN总线的特点,提出一种基于指数分区的EDF动态调度算法,以此来提高CAN总线的实时性以及全电子执行单元发送消息的成功率。对改进后的EDF算法的编码进行详细的描述,通过使用量化误差的概念,推导任务的可调度性公式,以此来衡量算法的优化程度。使用Matlab中的truetime工具箱和全电子执行单元的通信数据,对该算法进行仿真实验,并与平均分区的EDF算法进行比较。仿真结果表明:本文算法能够平衡高低优先级的关系;发送消息的成功率更高。改进后的调度算法能够实现消息的动态调度,良好地解决了计算机联锁全电子执行单元中CAN总线网络资源不足时任务不可调度的问题。     

计算机联锁系统S700K电路图软件动态设计

研究五线制S700K型转辙机电路的基本原理,分析启动电路、控制电路、表示电路所涉及到的设备图元以及图元的类型和图元之间的坐标关系,并建立数据库存储图元的数据信息,读取数据库中各个图元的基本信息,画出五线制转辙机电路的静态电子图纸。设计搜索算法,接收联锁机的驱动命令,根据1DQJ励磁电路,2DQJ转极电路以及DBJ和FBJ电路中继电器的励磁条件和三者之间的联锁关系,从每张图的电源正端开始搜索动态回路,结果动态实现了五线制道岔控制电路的动作回路和表示回路的动作过程。     

减少车站断电施工对信号计算机设备的影响

针对铁路信号计算机设备经常出现断电后难以启动成功的故障现象,本文说明了由此可能带来的严重影响,并分析故障原因,同时给出了避免这种故障出现以至影响行车的三种方法.     

站内弯股移频电码化技术探讨

从行车安全、运输效率的角度探讨经道岔弯股的列车通过进路上实施弯股移频电码化的必要性,结合ZPW-2000型站内移频电码化系统论述其可行性。     

论铁路运输发展需求和计算机联锁系统工程化

本文介绍了计算机联锁系统在系统结构、实施、维护环节的现状，并分析了计算机联锁系统软硬件未来发展的趋向。     

Joint Distortion Model for Progressive Image Transmission Using Error Correcting Arithmetic Codes

A novel joint source channel distortion model was proposed, which can essentially estimate the average distortion in progressive image transmission. To improve the precision of the model, the redundancy generated by a forbidden symbol in the arithmetic codes is used to distinguish the quantization distortion and the channel distortion, all the coefficients from the first error one to the end of the sequence are set to be a value within the variance range of the coefficients instead of zero, then the error propagation coming from the entropy coding can be essentially estimated, which is disregarded in the most conventional joint source channel coding (JSCC) systems. The precision of the model in terms of average peak-signal-to-noise has been improved about 0.5 dB compared to classical works. An efficient unequal error protection system based on the model is developed, and can be used in the wireless communication systems.     

Data display techniques for transportation analysis and planning: an investigation of three computer‐produced graphics

Graphics are a powerful but often costly means of communication. Computer‐drawn graphics offer a new and relatively inexpensive way to assist the communication of complex technical information to both planners and non‐technical people whose full potential is now beginning to be realized. This paper discusses the utility of graphics and introduces three computer‐drawn graphic techniques which may be useful, both for analysis and presentation of results, in the transportation planning process. CENVUE(S) produces a three‐dimensional, perspective‐view map, on which virtually any type of transportation data or performance indicator can be displayed. VAP is designed to display origin‐destination travel patterns in any region. TDN transforms a physical‐distance network into a time‐distance network so that effects of different speeds in the transportation network can be readily seen. The cost‐effectiveness of each technique is briefly discussed and some recommendations for evaluating computer graphics techniques are provided to aid the user in further assessing their utility in the transportation planning process.     

DS6-K5B计算机联锁系统硬件国产化实施方案

本文介绍了DS6-K5B计算机联锁系统硬件国产化实施过程，分析了执行国际通行标准中要解决的问题及采取的技术措施，并介绍了实施效果。