translate text-extracted concepts. The structure and function of the various. NLD ... machine aided indexing system, known as the NASA. Lexical. Dictionary.
NASA Contractor
NASA's
Online
Aided
Final
June and
4518
Machine
Indexing
System
Report
P. Silvester, Paul
RMS
Report
Michael
T. Genuardi,
H. Klingbiel 0 0
Associates
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Heights,
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08/01/92
NASA
LEXICAL
PAGE
DICTIONARY CADMIUM TELLURIDES. MERCURY TELLURIDES O0 O0
(HG,CD)TE;999 &;999 /U/;999 A;AND A;AND;B A;AND;B;STARS
A STARS, B STARS A STARS, B STARS
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A
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A;AND;F;STARS A;AND;F;TYPE A;AND;F-TYPE A;BAND A;GIANT A;GIANTS A;STAR A;STARS A;SUPERGIANT A;SUPERGIANTS A;TYPE A;TYPE;SHELL A;TYPE:SHELL;STAR A;TYPE;SHELL;STARS A;TYPE;STAR A;TYPE;STAR5 A;136T A;999 A-IAND A-;AND;B-STARS
a
A STARS A STARS A STARS A STARS GALACTIC O0
CLUSTERS
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A STARS, B STARS O0 ACRYLIC RESINS ACRYLATES. ALKYL COMPOUNDS BINARY MIXTURES O0 O0 ALTERNATING CURRENT A STARS, F STARS ARTIFICIAL INTELLIGENCE AUTOMATIC GAIN CONTROL A STARS A STARS AMORPHOUS SILICON,
A-;999 A-ALKYLACRYLATE;POLYMERS A-ALKYLACRYLATE;999 A-B;BINARY A-B;999 A-BAND;gg9 A-C;999 A-F;STARS A-I;TECHNOLOGY A-M/AGC;999 A-SHELL;STAR A-SHELL;STARS A-SI:H;FILMS
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NASA
LEXICAL
DICTIONARY
BY
POSTING
TERN
PAGE
SPACE COMMERCIALIZATION. LAUNCH VEHICLES SPACE COMMERCIALIZATION. LAUNCH VEHICLES LAUNCH VEHICLES LAUNCH VEHICLES LAUNCH VEHICLES LAUNCH VEHICLES LAUNCH VEHICLES LAUNCH VEHICLES LAUNCH VEHICLES AIR BREATHING BOOSTERS, LAUNCH VEHICLES AIR BREATHING BOOSTERS. LAUNCH VEHICLES AIR BREATHING BOOSTERS. LAUNCH VEHICLES LAUNCH VEHICLES LAUNCH VEHICLES AIR BREATHING BOOSTERS. ,LAUNCH VEHICLES LAUNCH VEHICLES, SOVIET SPACECRAFT LAUNCH VEHICLES, SOVIET SPACECRAFT LAUNCH WINDOWS LAUNCH WINDOWS LAUNCH WINDOWS LAUNCH WINDOWS. SPACECRAFT LANDING. WINDOWS (INTERVALS) LAUNCHERS ELECTROMAGNETIC PROPULSION, LAUNCHERS LAUNCHERS LAUNCHERS LAUNCHERS LAUNCHERS LAUNCHERS LAUNCHERS LAUNCHING LAUNCH|NG LAUNCHING LAUNCHING LAUNCHING LAUNCHZNG BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES LAUNCHING BASES
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53
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in
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16-FM
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REPORT
DOCUMENTATION
I. AGENCY USE ONLY (l_ve blank)
PAGE
_
2. REPORT DATE September
_q,p,o,,_OMBNo.0704-roSS
3. REPORTTYPE AND DATES COVERED Contractor Report
1993
5. FUNDING NUMBERS
4. TITLE AND SUBTITLE NASA's Online Machine Aided Indexing System
C NASW-4584
Final Report
_. ^u'm0R_) June P. Silvester, Michael T. Genuardi and Paul H. Klingbiel 8. PER.FOR/vgNGORGANIZATION
PBRFORMINOORGANIZATION NAME(S) AND ADDRESS(ES)
REPORT NUMBER
NASA Center for AeroSpace Information Linthicum Heights, MD 21090-2934
SPONSORING/MONITOP..INGAGENCY NAME(S) AND ADDRESS(F.,S)
10.SPONSORING/NiONITORING AGENCY
National Aeronautics and Space Administration
REPORT NUMBER NASA-CR-4518
Washington, DC 20546
h.s_Pt_,cr,,,Rv
No'rr.s w
Y 12aDISTRIBUTION/AVAILAbILITY STATEMENT
12b. DISTRIBUTION CODE
Unclassified - Unlimited Subject Category - 82 13.ASSTP.ACT (maximum 200 words) This report describes the NASA Lexical Dictionary, a machine aided indexing system used online at the National Aeronautics and Space Administration's Center for AeroSpace Information (CASI). This system is comprised of a text processor that is based on the computational, non-syntactic analysis of input text, and an extensive 'knowledge base' that serves to recognize and translate text-extracted concepts. The structure and function of the various NLD system components are described
in detail.
Methods used for the development of the knowledge base are discussed. Particular attention is given to a statistically-based text analysis program that provides the knowledge base developer with a list of concept-specific phrases extracted from large textual corpora. Production and quality benefits resulting from the integration of machine
aided indexing at CASI are discussed along with
a number of secondary applications of NLD-derived systems including on-line spell checking and machine aided lexicography.
14.SUIL_.£T TERMS
15. _YMBER OPPAOES
64
computer techniques, dictionaries, information retrieval, information
16. PRICECODE
systems, terminology, thesauri
A04 i
17. SE_
CLASSIFICATION
Ol_REPORT
U_"I_
18.SECURITY CLASSIFICATION OF TI-DSPAGE Available
UncI_
19.SECUPJTYCLASSIFICATION OF ABSTRACT
from NASA Center for AeroSpace 800 Elkridge Landing Road Linthicum
Heights,
(301) 621-0390
MD
Unclus
20.LIMITATION OF ABSTRACT l,Jnlimi__¢[
Information
2109@2934 qF