By Zongmin Ma
Accumulating the newest study effects from the best researchers within the box of fuzzy object-oriented databases, Advances in Fuzzy Object-Oriented Databases: Modeling and purposes supply a unmarried resource for present examine and sensible functions in fuzzy object-oriented databases. This publication contains significant elements of fuzzy object-oriented database modeling - conceptual, logical and actual, in addition to information of implementations and purposes. Readers will take advantage of an entire knowing of the notions, thoughts, and strategies regarding the study and advancements of fuzzy object-oriented databases. This e-book can act as a kick off point and a reference for his or her learn and advancements and stimulate the curiosity within the box of fuzzy object-oriented databases and extra advertise the examine within the box.
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Extra info for Advances in Fuzzy Object-Oriented Databases: Modeling and Applications
However, only a few of them combine probability theory and fuzzy logic, in order to deal with both uncertainty and imprecision. Early works on fuzzy extension of object-oriented models were done by George, Buckles, and Petry (1993) and Itzkovich and Hawkes (1994), which introduced inclusion degrees between classes in a hierarchy. An inclusion degree of one class to another could be computed on the basis of the fuzzy ranges of their common attributes. For example, Rossazza, Dubois, and Prade (1997) defined four inclusion degrees, depending on whether necessary ranges or typical ranges were used for each of the two classes.
The fuzzy set of specific constraints C t' consists of all the single-type dependent constraints (with associated membership grades) that were defined for the characteristics of type t' and necessarily have to be an element of Ct1, Ct2, or Ctˆ, with tˆ being an ancestor type of t1 or t2. The set of all instances Vos' instance is constructed by calculating the Cartesian product Vos1instance ⊗ Vos2instance and merging the states of the objects of the resulting pairs. The associated EPTVs are calculated by applying the logical conjunction operator ∧~ for EPTVs.
The object identifier oid is used to refer to the (state of the) object. The set of Copyright © 2005, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. 22 de Tré & de Caluwe object names N can be empty. The set of all the instances of an object type t ∈ Tobject is written as Vtinstance. If t is a subtype of another object type tˆ, then Vtinstance ⊆ Vtˆ instance. The extent of an object type t is written as Vtextent and is defined as the set of all the persistent instances of t within a particular database.
Advances in Fuzzy Object-Oriented Databases: Modeling and Applications by Zongmin Ma