ISSN:
1573-7675
Keywords:
fuzzy database
;
fuzzy relational model of fuzzy data
;
fuzzy relational algebra
;
fuzzy retrieval
;
possibility distribution
Source:
Springer Online Journal Archives 1860-2000
Topics:
Computer Science
Notes:
Abstract In the real world, there exist a lot of fuzzy data which cannot or need not be precisely defined. We distinguish two types of fuzziness: one in an attribute value itself and the other in an association of them. For such fuzzy data, we propose a possibility-distribution-fuzzy-relational model, in which fuzzy data are represented by fuzzy relations whose grades of membership and attribute values are possibility distributions. In this model, the former fuzziness is represented by a possibility distribution and the latter by a grade of membership. Relational algebra for the ordinary relational database as defined by Codd includes the traditional set operations and the special relational operations. These operations are classified into the primitive operations, namely, union, difference, extended Cartesian product, selection and projection, and the additional operations, namely, intersection, join, and division. We define the relational algebra for the possibility-distribution-fuzzy-relational model of fuzzy databases.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01014018
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