Gremas

GREMAS Genealogical Retrieval by Magnetic Tape Storage... 

Rossler S, Kolb A. The system GREMAS, an integral part of the IDC system for chemical documentation. J Chem Doc 1970 10 128-134. 

Meyer, E. Superimposed screens for the GREMAS system, E. Meyer, paper presented at the FID/IFIP Conference, Rome (1967). The IDC-System for Chemical Documentation. J. Chem. Doc. 9 (2), 109—113 (1969). 

Meyer, E. Superimposed Screens for the GREMAS System. In Mechanised Information Storage Retrieval and Dissemination, Proceedings ofFID-IFP Conference, Rome, June 14-17 1967 Samuelson, K. Ed. North Holland Amsterdam, 1968. 

As the next syntactic device let us consider three-position descriptors, each position of which provides information of a particular kind. These pieces of information are firmly associated in one term, which creates an especially close connection between them. Such terms have proved successful in the fragment code GREMAS for chemical structures and also for the documentation of patent literature in the fields of plant protection and agriculture (see Figure 5). 

AUTOMATIC TRANSLATION OF GENSAL REPRESENTATIONS OF MARKUSH STRUCTURES INTO GREMAS FRAGMENT CODES AT IDC... 

INTRODUCTION WHY AUTOMATIC TRANSLATION OF GENSAL INTO GREMAS ... 

The main disadvantage until now was that the GREMAS fragments had to be evaluated manually in the case of Markush structures of any complexity. This is a... 

GREMAS highly sophisticated search strategy allows searches in different ievels of structural generalization... 

Generation of the GREMAS fragment codes has to be done manually for queries and for input of the file structures... 

The GREMAS translation of a carbon atom is done in two steps. The primary specification (see Figure 7) tells us what GREMAS district type it belongs to, how the heteroatom neighbourhood in terms of heteroorientation is, and how many hydrogen atoms it carries. 

The secondary specification (see Figure 8) gives the full description of the carbon atom according to the rules of the GREMAS system with a three-letter code. 

---