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- Newsgroups: triangle.talks
- Path: sparky!uunet!concert!samba!losee
- From: losee@ils.unc.edu (Bob Losee)
- Subject: Fuzzy Logic and Information Retrieval
- Message-ID: <1992Oct9.184013.1318@samba.oit.unc.edu>
- Keywords: Extended Fuzzy Linguistic Approach to Generalize Boolean Information Retrieval
- Sender: usenet@samba.oit.unc.edu
- Nntp-Posting-Host: sapphire.ils.unc.edu
- Organization: UNC Office of Information Technology
- Date: Fri, 9 Oct 1992 18:40:13 GMT
- Lines: 53
-
-
- An Extended Fuzzy Linguistic Approach to
- Generalize Boolean Information Retrieval
-
-
- Donald H, Kraft
- Department of Computer Science (Chairman)
- Louisiana State University
- Baton Rouge, LA 70803-4020
- USA
- (504) 388-1495 Voice
- (504) 388-1465 Fax
- kraft@bit.csc.lsu.edu
-
- ** Wednesday, Oct 14, 1992 4 PM **
- ** Manning Hall, Room 117 **
-
-
- Abstract
-
-
- The generalization of Boolean information retrieval
- systems (IRS) is still of interest to scholars. In spite of
- the fact that commercial systems use Boolean retrieval
- mechanisms, such systems still have some limitations. One of
- the main problems is that such systems lack the ability to
- deal well with imprecision and subjectivity. Previous
- efforts have led to the introduction of numeric weights to
- improve both document representations (term weights) and
- query languages (query weights). However, the use of
- weights requires a clear knowledge of the semantics of the
- query in order to translate a fuzzy concept into a precise
- numeric value. Moreover, it is difficult to model the
- matching of queries to documents in a way that will preserve
- the semantics of user queries.
-
- A linguistic extension has been generated, starting
- from an existing Boolean weighted retrieval model and for-
- malized within fuzzy set theory, in which numeric query
- weights are replaced by linguistic descriptors which specify
- the degree of importance of the terms.
-
- In the past, query weights were seen as measures of the
- importance of a specific term in representing the query or
- as a threshold to aid in matching a specific document to the
- query. The linguistic extension was originally modeled to
- view the query weights as a description of the ideal docu-
- ment, so that deviations would be rejected whether a given
- document had term weights that were too high or too low.
- This paper looks at an extension to the linguistic model
- that is not symmetric in that documents with a term weight
- below the query weight are treated differently than docu-
- ments with a term weight above the query weight.
-