集值信息系统中对象更新时近似集的性质研究

Research on Properties of Approximations in Set-valued Information Systems when Objects Vary with Time

集值信息系统是信息系统的一般化模型。在实际应用中信息系统随着对象的变化而不断地动态变化。讨论了相容关系下对象增加时近似集的变化规律,提出了在集值信息系统和集值决策信息系统下近似集变化规律的性质,并通过实例给予验证。

The set-valued information system is an extension of the general model of the information system.In real-life applications,the information system changes dynamically according to the variation of objects.This paper discussed the changing rules of approximations under the tolerance relation when objects vary with time and presents properties of the variation of approximations in set-valued information systems and set-valued decision information systems.Examples are given to illustrate the validity of the proposed properties.