SGIP短信协议及其在铁路客运中的应用

目前,国内实际应用的短信协议有SGIP和CMPP,两者都符合国际通用SMPP标准.详细阐述SGIP协议的框架及其在铁路客运中的应用.     

列车通信网络及其访问控制协议和选用原则

介绍列车通信网络的发展历程,主要的列车通信网络结构和功能,提出列车通信网络中合适的访问控制协议,结合我国具体情况,给出列车通信网络的选用原则.简要描述了列车通信网络的应用.     

铁通调度指挥系统的研究

介绍铁通调度指挥系统的设计与实现.在Dijkstra算法基础上进行改进,实现长途通信网资源自动路由选择,并构建了基于角色访问控制的网络体系.为铁通构筑一个低成本、高效率、安全、稳定、可扩展,适合目前应用兼容未来发展的调度指挥平台.     

基于API函数的模拟终端串行通信设计

通过对模拟终端串口通信设计的介绍,阐述在Windows 9X/NT操作系统中,API函数和多线程技术在串行通信中的应用.该方法能更加灵活、高效地控制串口操作.     

Performance comparison of multicast routing protocols based on NS-2

The electronic system in a comprehensive shipboard has a extremely wide bandwidth. It supports synchronized and asynchronous data transmission, multimedia correspondence, and videophone conferencing. In order to guarantee the security and correspondent real time of the communication, choosing a multicast routing protocol based on different applications is a key problem in terms of the complexity of the system. A simulation model was first designed for existing multicast routing protocols in NS-2 and analysis was performed on their corresponding application environments. The experiments proved that PIM-DM based on the shortest-path tree protocol is suitable for communication in the field of comprehensive shipboard. Further work that is necessary is also discussed.     

螺杆空气压缩机试验台软件系统的开发

针对螺杆式空气压缩机的性能测试问题,设计了基于动态链接库调用和串口通讯技术的实时数据获取方案.提出了基于Word宏调用技术的试验报表自动生成方案.用Visual Basic可视化编程手段开发了螺杆式空气压缩机试验台软件系统,具备了对螺杆式空压机进行全面、快速、准确的性能测试的功能,在投入北京南口机车车辆机械厂实际生产运行后,表明该系统达到设计要求,并且运行稳定、可靠.     

驼峰电子化控制系统中通信技术应用的研究

结合在驼峰电子化执行模块控制系统研发中的实际经验,介绍驼峰电子化控制系统中主控机与智能电子模块间通信方式的重要性,提出一种基于EPP协议的安全可靠、实时的通信方法.     

Chaotic synchronization based on nonlinear state-observer and its application in secure communication

Chaotic synchronization is a branch of chaotic control. Nowadays, the research and application of chaotic synchronization have become a hot topic and one of the development directions is for the research on chaos. In this paper, a universal nonlinear stateobserver is presented for a class of universal chaotic systems to realize the chaotic synchronization, according to the theory of state-observer in the modem control theory. And theoretic analysis and simulation results have illustrated the validity of the approach. Moreover, the approach of synchronization proposed in this paper is very easy, flexible and universal with high synchronization precision. When the approach is applied to secure communication, the results are satisfying.     

DeviceNet现场总线主站通信接口的研制

现场总线技术已成为当今工业自动化领域的主流,其中之一的DeviceNet总线是一种基于CAN协议的符合全球工业标准的开放型通信网络的总线,相对于其他总线来说,它具有较大的领先性,突出的高可靠性、实时性和灵活性,其应用日益广泛.然而,国内对DeviceNet总线的研究开发还处于起步阶段,远远落后于市场需求.本文通过对DeviceNet协议的深入研究,开发了主站设备通信接口,并编写通信接口的驱动程序和DeviceNet应用层程序,完成了实际设备的应用调试工作,从而解决了制约DeviceNet在我国推广普遍存在的问题.     

Study on pattern time delay shift coding scheme

1 Introduction1 The underwater acoustic communications are needed for military affairs and commercial fields. There are lots of applications of underwater acoustic communications, such as in oceanographic data collection, exploration of natural undersea r…