ERIC Number: ED260735
Record Type: RIE
Publication Date: 1984-Oct
An Operational System for Subject Switching between Controlled Vocabularies: A Computational Linguistics Approach.
Silvester, June P.; And Others
This report describes a new automated process that pioneers full-scale operational use of subject switching by the NASA (National Aeronautics and Space Administration) Scientific and Technical Information (STI) Facility. The subject switching process routinely translates machine-readable subject terms from one controlled vocabulary into the equivalent terms of another controlled vocabulary using a system called the NASA Lexical Dictionary (NLD). This report also describes the NLD, discusses how to build a lexical dictionary system, details the resources needed, and explains how to maintain the system after it is built. A description of the NASA STI Facility's experiences with their first input vocabulary, that of the Defense Technical Information Center (DTIC), is included. Following a preface and executive summary, this report is divided into seven sections: (1) introduction (purpose, significance, definition of the NASA Lexical Dictionary, scope of NLD, preliminary results, presentation, and project personnel); (2) system description; (3) history; (4) procedures for building a lexical dictionary; (5) data file maintenance; (6) results and conclusions; and (7) summary. A glossary, two appendices, and references are included. (THC)
Publication Type: Reference Materials - Vocabularies/Classifications; Reports - Descriptive
Education Level: N/A
Sponsor: National Aeronautics and Space Administration, Washington, DC. Scientific and Technical Information Branch.
Authoring Institution: Planning Research Corp., McLean, VA.