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Article type: Cover
1981 Volume 31 Issue 5 Pages
Cover1-
Published: May 01, 1981
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Article type: Cover
1981 Volume 31 Issue 5 Pages
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
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Published: May 01, 1981
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Article type: Index
1981 Volume 31 Issue 5 Pages
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Published: May 01, 1981
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Ryoji Fujishige, Kazuo Koyano
Article type: Article
1981 Volume 31 Issue 5 Pages
195-200
Published: May 01, 1981
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Comparison between name and fragment code at generic search of chemical compounds has been done with phenylethanol as an example, using CA Search on-line and GREMAS code of IDC batch system. GREMAS code is better than name both in recall and relevance factor. Relevance factor of the former is especially good, this seems to be due to the existence of another code named zone-term which correlates fragments syntactically each other. By nomenclature, it is almost impossible to anticipate all the possible names in either case of a compound being a heading parent or a substituent. So, it is difficult to increase the effectiveness of generic search. The extension of the comparison is discussed.
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Yuji Hirota
Article type: Article
1981 Volume 31 Issue 5 Pages
201-208
Published: May 01, 1981
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Chemical Abstracts Service entered the field of online service based on chemical structures with its own system called CAS ONLINE. The system has been accessible since Dec. 1980 in Japan. CAS ONLINE made it possible to search a large chemical substance file derived from the CAS Chemical Registry System using the chemical structure which is familier to the chemist as a search term. The search results contains chemical structure diagrams and the CAS Registry Numbers which are in turn used as search terms in the document search. The chemical substance file of CAS ONLINE contains about 2,000,000 compounds which is the largest chemical structure file searchable on-line. When a search is to be performed, the searcher analyzes the query structure to identify distinctive structural features or fragments, locates the corresponding search screens in the screen dictionary, and constructs a search profile containing screen numbers and sets of screen numbers combined with Boolean logic. The large structure file is divided into several segments which are searched in parallel by minicomputers. Each minicomputer holds records for about 750,000 substances and it takes about five minutes to search its full file. CAS ONLINE system features and a search example are described.
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Tadao Morozumi
Article type: Article
1981 Volume 31 Issue 5 Pages
209-212
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
212-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
212-
Published: May 01, 1981
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Yuichi Sunakawa
Article type: Article
1981 Volume 31 Issue 5 Pages
213-220
Published: May 01, 1981
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K.N
Article type: Article
1981 Volume 31 Issue 5 Pages
221-222
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
223-231
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
224-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
224-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
224-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
224-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
224-225
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
225-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
225-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
225-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
225-
Published: May 01, 1981
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
225-
Published: May 01, 1981
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[in Japanese]
Article type: Article
1981 Volume 31 Issue 5 Pages
226-227
Published: May 01, 1981
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
228-230
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
230-
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
232-
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
232-
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Article type: Appendix
1981 Volume 31 Issue 5 Pages
App2-
Published: May 01, 1981
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