tailieunhanh - Báo cáo khoa học: "A LAYERED APPROACH TO NLP-BASED RETRIEVAL"

A layered approach to information retrieval permits the inclusion of multiple search engines as well as multiple databases, with a natural language layer to convert English queries for use by the various search engines. The NLP layer incorporates morphological analysis, noun phrase syntax, and semantic expansion based on WordNet. | A LAYERED APPROACH TO NLP-BASED INFORMATION RETRIEVAL Sharon Flank SRA International 4300 Fair Lakes Court Fairfax VA 22033 USA flanks@ Abstract A layered approach to information retrieval permits the inclusion of multiple search engines as well as multiple databases with a natural language layer to convert English queries for use by the various search engines. The NLP layer incorporates morphological analysis noun phrase syntax and semantic expansion based on Word-Net. 1 Introduction This paper describes a layered approach to information retrieval and the natural language component that is a major element in that approach. The layered approach packaged as Intermezzo1 M was deployed in a pre-product form at a government site. The NLP component has been installed with a proprietary IR engine PhotoFile Flank Martin Balogh and Rothey 1995 Flank Garfield and Norkin 1995 at several commercial sites including Picture Network International PNI Simon and Schuster and John Deere. Intermezzo employs an abstraction layer to permit simultaneous querying of multiple databases. A user enters a query into a client and the query is then passed to the server. The abstraction layer part of the server converts the query to the appropriate format for each of the databases . Fulcrum Retrieval Ware Topic WAIS . In Boolean mode queries are translated using an SGML-based intermediate query language into the appropriate form in NLP mode the queries undergo morphological analysis NP syntax and semantic expansion before being converted for use by the databases. The following example illustrates how a user s query is translated. Unexpanded quei y natural disasters in New England Search-engine specific natural AND disaster s AND New AND England Semantic expansion natural and disaster s or hurricane s or earthquake s or tornado es in New England or Maine or Vermont or New Hampshire or Rhode Island or Connecticut or Massachusetts The NLP component has been deployed with as many as 500

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