Visibility and Focus: An Extended Framework for Granular Reasoning

Authors:
Yasuo Kudo;Tatsuya Murai
Affiliations:
Dept. of Computer Science and Systems Eng., Muroran Institute of Technology, Japan;Graduate School of Information Science and Technology, Hokkaido University, Japan
Venue:
Proceedings of the 2005 conference on Advances in Logic Based Intelligent Systems: Selected Papers of LAPTEC 2005
Year:
2005

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Abstract

In this paper, we introduce another concept of granular reasoning, called visibility. Visibility separates all sentences into “visible” sentences, that is, sentences we consider, and “nvisible” sentences which are out of consideration. Combining visibility and focus, we connects granular reasoning and four-valued truth valuations. We also discuss relationship among granularity based on the visibility and focus, nonmonotonic reasoning by Ziarko's variable precision rough set models, and knowledge base revision.