中文摘要：

模糊知识中的否定关系可分为矛盾否定关系、对立否定关系和中介否定关系,FScom是区分这3种否定关系的模糊集。本文在此基础上,对模糊知识及其各种否定的集合描述进一步研究,提出了一种改进的模糊集IF-Scom,并讨论了IFScom的特征、运算及相关性质。

英文摘要：

The negation in fuzzy knowledge can be divided into three distinct classes： contradictory negation,opposite negation and medium negation.FScom is a fuzzy set used to differentiate these three negations.On the basis of FScom,the set description of fuzzy knowledge and its different kinds of negations were further investigated,and one improved kind of fuzzy set IFScom is proposed.Also,its characteristic,operation and related properties are also investigated.