| 1. | When it comes to publish / subscribe ( p / s ) architectures , it can meet the integrate demand of the crcm well
而采用publish subscribe ( p s )结构，能够很好满足铁路管控系统集成的需求。 |
| 2. | This essay analysis the data flows semantics in crcm system , compartmentalize them into 3 types : common data flow , operation data flow and control data flow
本文分析了铁路管控系统中的数据流语义，将数据流类型抽象为公共基础信息、业务信息和控制信息三类。 |
| 3. | Integrate the crcm system should meet the following requirement : autonomous controllability and autonomous coordinability , online fault tolerant online maintenance and online expansion
铁路管控集成系统需要具有良好的自律可控性和自律可协调性、在线容错、维护功能、在线扩展功能。 |
| 4. | Ah the same time , there are various types of data flows in crcm system . different types of data flows have different communication demand , integrate system need to provide the qos communication service in wan
同时，铁路管控系统中存在多种不同类型的数据流，不同类型数据流对通信的要求不同，集成系统应能提供广域网环境下的qualityofservice ( qos )通信服务。 |
| 5. | At present , these subsystems are independent each other and can not share information with each other efficiently , which lower crcm system ' s efficiency , so it becomes very important to integrate these subsystems so as to improve railway ' s level of management and quality of service
当前，这些子系统彼此间相互独立，难以进行有效的数据交互，降低了铁路管控系统运行效率。因此，需要将这些子系统集成以提高铁路管控系统的管理水平和服务质量。 |
| 6. | Then the essay proposes a p / s based 2 - level architecture qos communication solution in crcm , gives the critical technologies of this solution include the establish of the multicast group dynamic reliable mechanism and the node ' s join and leave . at last , the essay simulates and compares the c / s integrate scheme and p / s scheme , analysis the main parameter of the model
然后针对铁路管控系统，提出了一种采用p s两级结构，广域网环境下的qos通信解决方案，并给出了实现这一模型的几个关键技术，包括：动态组播组的建立、可靠性机制、节点的加入和退出。 |
| 7. | China railway control and management system ( crcm ) is a huge distributed system that constituted by serious subsystems . it depends on cooperation of subsystems that the whole crcm system functions normally . the degree of cooperation of these subsystems determines efficiency of the whole system ' s function to a certain degree
中国铁路管控系统是由多个子系统构成的广域分布系统，其正常运营有赖于这些子系统的协同工作，子系统的整合程度的大小在一定程度上决定了整个系统运行效率的高低。 |
