Unacceptable components in fuzzy relational databases

✍ Scribed by Michinori Nakata

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 850 KB
• Volume: 11
• Category: Article
• ISSN: 0884-8173
• DOI: 10.1002/(sici)1098-111x(199609)11:9<633::aid-int3>3.0.co;2-l

✦ Synopsis

The existence of unacceptable components, which consist of unacceptable tuples and elements in attribute values, is shown in fuzzy relational databases. The unacceptable components are created by update operations, insertion, deletion, and modification. An unacceptable tuple in a relation is a tuple such that the degree of its not belonging to that relation is greater than that of its belonging to. The unacceptable tuple can be easily eliminated from relations. There are three kinds of unacceptable eleme~ts. One case of unacceptable elements is a redundant element created by insertion and modification. Another is an element created by a possible tuple value not at all or partially satisfying integrity constraints in insertion and modification. The other is an element created by a possible tuple value completely or partially satisfying update conditions in deletion. The unacceptable elements can be eliminated from relations without loss of information. As a result, we can obtain fuzzy relational databases without unacceptable components by a reasonable way.