Abstract:

Fuzzy set FScom has three kinds of negative relations, which are contradictory negative relation, opposite negative relation and medium negative relation. This paper puts forward the concept of λmedium negation, and defines the λinterval function to make the maximum membership degree principle of the traditional fuzzy set be applied in the fuzzy set FScom, and also gives the fuzzy comprehensive evaluation of the fuzzy set FScom and its application in disaster loss grade assessment.

Key words: fuzzy set FScom;λmedium negation;λinterval function;fuzzy comprehensive evaluation