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。
In recent years there are more and more new applications . especially applications involving the reliable transfer of large volumes of data from a source to multiple destinations across wide - area networks are expected to become increasingly important in the near future . a few examples are point - to - multipoint ftp , newsdistributions 近年来,许多新的应用不断产生,其中点对多和多对多的通信应用越来越广泛和重要,如网络视频会议、网络音频/视频广播、股市行情发布、远程教育等,由此容易导致带宽的急剧消耗和网络拥挤等问题。
This has given rise to an ever - increasing need to new applications , and especially applications involving the reliable transfer of large volumes of data from a source to multiple destinations across wide - area networks are expected to become increasingly important in the near future . a few examples are point - to - multipoint ftp , news distributions , web caching and software updates 许多新的应用不断产生，其中点对多点的数据传输应用，正变得越来越重要，如网络视频会议、网络音频视频广播、股市行情发布、多媒体远程教育、 cscw协同计算、在线信息恢复，软件或代理缓存更新等。
