logical expression

Discuss the relation between encoder truth table and logical expression

编码器真值表与逻辑表达式的关系探讨

, primary keys retrieval of dispersed points, group data ( data matrix or pieces of data set) retrieval, and logical expression retrieval with Secondary keys.

成组数据（数据矩阵或数据块）检索以及按次关键字的逻辑表达式检索。

Through to the encoder truth table characteristic analysis, has obtained the direct writing logical expression concrete method using the Karnaugh map most minor term merge rule.

通过对编码器真值表的特点分析，利用卡诺图最小项合并规则得出了直接书写逻辑表达式的具体方法。

In view of the above logical expression process, this paper models by UML process, designs the corresponding physical storage structure and basic geographic event database to get ready for the subsequent geographical events in the application of the spatial data updating.

针对上述逻辑表达过程进行UML过程建模，设计出相应的物理存储结构和基本地理事件库，为后续地理事件在空间数据更新中的应用打下基础。