The whole structure of the system is three layer construction, the head connecting into layer, the center application layer and the database support layer of back-end.
系统的整体架构为三层结构，前端接入层、中间应用层和后端数据库支持层。
It probes into the structure of SSH protocol system and discusses the three different levels of SSH, namely transport layer protocol, user authentication protocol and connection protocol.
探讨了SSH协议体系结构，介绍ssh三个层次：传输层协议、用户认证协议、连接协议和密钥机制。
The three-layer structure database system based on the CORBA data module to enhance the measuring system exchange adaptability, safety and expansibility.
基于CORBA数据模块的三层结构模式的数据库系统，增强了测量系统交互的灵活性、安全性、扩展性。
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