The research promotes a new mta ( message transfer agent ) system frame . according to function this frame divides mta into two services : message service and reliable transfer service . the first service takes charge of the communication with the ua ( user agent ) , the second one transfers the messages to the remote service 2 .研究提出了一种新的mta ( messagetransferagent ,报文传输代理)系统框架,该框架将mta按功能分为两部分,即报文服务和可靠传输服务,前者负责与ua的交互,后者负责消息的远程发送; 3 .研究并设计了一个多级可靠报文传输协议,该协议能满足不同应用对于报文传输可靠性的需求,并使得用户在发送报文的过程中能够对报文的发送状态进行监控。
First , it introduces the network control center of beidou satellite and the beidou satellite locating navigational system , which are the background of design and implementation of web service , and the function and status of web service in system . then , it totally analysis the identity and structure of web service , and expound several technologies of web service : the first is xml which is the base technology , the second is wsdl which is the interface description language of service , the third is soap which is communication and message transferring of service , the fourth is uddi which is the description , discovery and integration of service 首先,对webservice的设计实现所在的系统背景? ?北斗卫星定位导航定位通信系统和民用网管中心进行简要介绍,以及webservice在系统内的作用和地位;然后从总体上分析了webservice特性、体系结构,并阐述了几种webservice的相关技术:第一,核心技术xml ;第二, web服务描述语言wsdl ;第三,服务组件的通讯和消息传递协议soap ;第四,服务组件的描述、发现和集成协议uddi 。
To validate the performance of the system , a series of experiments are made on a 200mw unit simulator of max1000 dcs . the results of these experiments indicate : by following certain physical principles , for each real component of the control system , the mathematical model which is constructed to reveal its characteristics reflects exactly the work and message transfer process ; by considering the load demand to the unit and the electricity net ' s frequency difference , also combing with the real capacity that the unit can stand , the ccs and deh models , which are contrived by using simulation blocks , can exactly harmonize the control of the turbine and the boiler and can also control the load . 为验证模型的性能,本文在基于max1000dcs系统的200mw机组仿真机上进行对建立的控制系统模型进行了一系列仿真试验,试验结果表明对控制系统的每一实际组件按照一定的物理规律所建立的反映其功能特性的数学模型,正确地反映了其工作过程及信息传递过程;利用仿真模块开发的协调控制系统及功频电液控制系统模型能够根据对机组的各种负荷要求和电网的频率偏差,结合机组所能承担负荷的实际能力,正确地协调对汽轮机和锅炉的控制,并对负荷加以控制。
Gossip algorithm is extended in the lan environment to facilitate the distributed message acknowledgement . real - time update of dynamic topology view is used to prevent failed instances to block message transfer . thus , reliable message exchange is implemented on top of unreliable multicast protocols 在局域网环境下扩展了gossip算法,实现了分布式消息确认机制,同时依据动态拓扑视图的实时更新避免失效实例对消息的阻塞,在不可靠多播协议的基础上实现了消息的可靠传输。
Web service realized internet service invoking which is based on soap 、 uddi etc . technologies , and these technologies are based on xml . web service is a software interface , which describes a group of operations which can be visited via standardized xml message transfer . it uses xml - based protocols to describe the operations or the data that will be exchange with another web service Web服务是一个软件接口,它描述了一组可以在网络上通过标准化的xml消息传递来访问的操作。它使用基于xml语言的协议来描述要执行的操作或者要与另一个web服务交换的数据。 xmlengine是建立在webservice上的一种技术。