第二部分从理论上讨论了动力大地测量网络数据库系统的基础知识和数据模型，研究了网络数据库系统的特点、工作模式以及主要技术。
The second part discussed the theoretical knowledge and data models of DGNDBS; studied the feature, work model and main technique of the network database system.
针对外包数据库系统中的隐私匹配问题，提出了基于分布针对计算机终端是网络系统中安全风险的根源问题之一，提出了一种新的基于进程保护的可信终端模型。
Aimed at the problem that the computer terminal is the source of the safe risk in the network system, this paper proposed a new reliable terminal model based on non-interference theory.
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