This paper introduces the basic concept and model of access security control of the database system in a multiuser information system. It also describes its concrete implementation.
本文介绍了多用户信息系统中数据库的安全性控制的基本概念及控制模型，以及在多用户信息系统中安全性控制的实现方法。
This paper describes the concept, system structure of the Decision Support system (DSS) firstly, then introduces the database, model library, knowledge library and arithmetic library of the DSS.
本文首先对决策支持系统(dss)的概念、体系结构进行了简要的介绍，阐述了DSS的数据库系统、模型库系统、知识库系统以及方法库系统。
In order to adapt to the design requirement of spatiotemporal database, this article proposes a new spatiotemporal er enhanced model and introduces its relevant concept as well as design method.
为了满足时空数据库设计的需要，提出了新的时空er模型并给出了相关的概念及设计方法。
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