一种基于连续不确定决策表的概念近似方法

复杂决策表通常具有连续定量的属性，存在部分未知值或存在描述一个对象的属性有多个可能值的情况，或者3种情况并存，称为连续不确定决策表。通过分析发现，连续不确定决策表可视为一种多值表元决策表。利用Fuzzy集理论可将多值表元决策表转化为带有隶属度的单一表元决策表；基于此，给出了扩展信息表和决策表的定义，提出了对多值表元决策表中决策概念下近似及边界的计算方法。

An Approach to Approximation of Decision Concepts of Continuous Uncertain Decision System

There are always various types of entries in DT from complex decision problem of command and control, that is, entries with a continuous quantitative attribute, unknown entries or multi-valued entries, and the three types of entries often occur in the same DT. The DT with these entries named Continuous Uncertain Decision Table ( CUDT ) can not be analyzed directly by CRST. Fortunately, by modeling those three types of entries in CUDT with Fuzzy Sets theory, CUDT can be transformed into a special DT called Extended Decision Table ( EDT ) in which each entry is associated with a membership degree. An extended CRST based on this idea is proposed to transform the CUDT into EDT, and the lower approximations and the boundaries of decision concepts in EDT are also calculated by the extended CRST.