A Note on Treatment of Incomplete Information in Object--Oriented Rough Sets

Yasuo Kudo; Tetsuya Murai

doi:10.14864/softscis.2006.0.2238.0

SCIS & ISIS 2006

Session ID : SU-D2-3

DOI https://doi.org/10.14864/softscis.2006.0.2238.0

Conference information

Host: Japan SOciety for Fuzzy Theory and intelligent informatics

Co-host: The Korea Fuzzy Logic and Intelligent Systems Society, IEEE Computational Intelligence Society, The International Fuzzy Systems Association, 21th Century COE Program "Creation of Agent-Based Social Systems Sciences"

SU-D2 Rough sets and Granular computing

A Note on Treatment of Incomplete Information in Object--Oriented Rough Sets

*Yasuo Kudo, Tetsuya Murai

Author information

Keywords: Incomplete information, Object--oriented rough sets, Tolerance relations

CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract

We consider to treat incomplete information in the framework of object--oriented rough set models proposed by Kudo and Murai. The object--oriented rough set model treats structural hierarchies among objects based on is-a relationship and has-a relationship, however, treatment of incomplete information about objects is not illustrated. In this paper, we introduce null value objects to the object--oriented rough set model, which illustrate incompleteness of objects that comes from ``absence of parts"". Moreover, we extend Kryszkiewicz's tolerance relation to apply to the object--oriented rough sets.

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