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Peer reviewedRoberts, Anita B.; And Others – Journal of Chemical Documentation, 1972
The experiences in developing current awareness services for selective dissemination of information from Chemical Abstracts'' Condensates data base are described. File standardization, the weighted-term method of searching, and the algorithm used to perform the search on the CDC 6600 computer and a user survey are discussed. (2 references)…
Descriptors: Algorithms, Computer Oriented Programs, Data Processing, Information Dissemination
Peer reviewedDeforeit, Huguette; And Others – Journal of Chemical Documentation, 1972
A computer system, named CORA, has been devised for coding chemical structures by fragmentation elements. It has been used to encode Markush formulas in patents according to the Ring codes used in the Ringdoc and Pestdoc services and results in an easy, speedy, reliable and inexpensive method. (4 references) (Author)
Descriptors: Chemistry, Computer Oriented Programs, Data Processing, Information Processing
Peer reviewedFigueras, John – Journal of Chemical Documentation, 1972
The set reduction algorithm is based on set theory and Boolean algebra rather than the graph-theoretic approach. Time trials with a small file of organic chemical structures indicate that the algorithm can be economically used for substructure (or complete structure) sequential searches on a file containing 30,000-50,000 computer-coded structures.…
Descriptors: Algorithms, Computer Oriented Programs, Data Processing, Information Retrieval
