Information Storage and Retrieval. Reports on Indexing Theory,Content Analysis,Feedback Searching and Dynamic Document Space.

摘要

The report covering work carried out for approximately two years (summer 1972to summer 1974) is divided into four parts:indexing theory (sections I to III),automatic content analysis (sections IV to VI),feedback searching (sections VII to IX),and dynamic file management (sections X to XII). In recent years,increasing attention has been paid to the study of a variety of file organization and retrieval algorithms,including some that have not yet found their way into operational implementation. Among these is the use of clustered file manipulations instead of inverted directory searches,vector matching processes instead of keyword coincidence counting,dynamic document space modification,automatic file retirement procedures,and interactive retrieval methodologies. A variety of algorithms to carry out the various processes are described and evaluated.