动态数据库规则获取和更新的粗糙集方法

随着客观世界的发展变化，新模式会不断地增加到数据库中，在已有的模式中会增加新成员，这就导致以前得到的规则集需要随之更新，在利用粗糙集方法获取规则的基础上,提出两种规则更新方法，并提出规则获取和更新的一般理论模型，强调充分发挥决策者和分析人员的主观能动性的重要性，根据客观实际提出新模式和原有模式中的新成员，以满足不断变化的外部情况，而不只是单纯依赖机器决策，并以实例说明。

OBTAINING AND UPDATING RULES BASED ON ROUGH SET THEORY IN DYNAMIC DATABASES

With the changes in the objective world,new members belonging to the present patterns and new patterns will be appended to the databases.Therefore,the former rules require updating.In this paper based on the rule set obtained using the rough set theory,two methods for rule updating are presented.And a general model is put forward in order to obtain and update rules.Decision makers and analysts must distinguish new patterns from others and sort new members into the previous patterns.Therefore,the importance of their subjective initiative is emphasized instead of depending only on machines.In the end,an example illustrates the reasonableness of the view.