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。
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。
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。
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