The report analyzes and evaluates methods of organizing data files, primarily for document retrieval applications. Three principal techniques are examined: the Multi-List System, the list-organized file, and the inverted and document-sequenced file. Statistical analyses were made of term associations based on 599 most common DDC descriptors. Results indicate the need of a large amount of processing against an extensive data base; since most documents have almost as many groups as index terms,...
Topics: DTIC Archive, SPERRY RAND CORP PHILADELPHIA PA UNIVAC DIV, *INFORMATION RETRIEVAL, *SUBJECT...

The concept of a nonmechanical, mass, random access, plated-wire memory has been validated in this phase of the continuing U.S. Air Force program. The memory model fabricated for this contract has 10,000,000-bit positions housing over 2.3 megabits of plated wire. Of these bits, 32,768 4-bit words have been exercised with a memory exerciser. The following characteristics of the plated-wire mass memory have been demonstrated: Nondestructive readout (NDRO); Selection in the bit dimension to...
Topics: DTIC Archive, Chong, C, SPERRY RAND CORP PHILADELPHIA PA UNIVAC DIV, *MEMORY DEVICES, CONSTRUCTION,...