Modeling fuzzy information in the IF $_{2}$ O and object-oriented data models

Abstract

In this paper, we focus on conceptual data modeling and logical database modeling of fuzzy information. The IFO data model is extended with fuzzy set theory to cope with imperfect as well as with complex objects in the real world at a conceptual level. Concerning the logical database modeling of fuzzy information, we focus on the object-oriented database model. Some major notions in the object-oriented databases such as objects, classes, objects-classes relationships, supertype/subtype, and multiple inheritances are extended under fuzzy information environment, and a generic model for fuzzy object-oriented databases is developed. In particular, we develop the formal approach to mapping a fuzzy IFO (IF $_{2}$ O) model to a fuzzy object-oriented database schema. Therefore, one can conduct the conceptual design of a database model with fuzzy information and then transform it into the logical database model.