Accession Number : ADA332837

Title :   (AASERT 94-045) Holographic Associative Memories for Database Processing

Descriptive Note : Final rept. 1 Feb 94-14 Jun 97

Corporate Author : COLORADO STATE UNIV FORT COLLINS DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Mitkas, Pericles A.

PDF Url : ADA332837

Report Date : 01 DEC 1997

Pagination or Media Count : 57

Abstract : Volume holographic memories combine high storage capacity, massive transfer rates, and the ability to associatively search the entire data set in a highly parallel way. Database applications can benefit greatly from these characteristics. The goal of this research was to evaluate the capability, of volume holographic storage to perform associative recall on binary data of an actual database and, thus, operate successfully in a database management environment. An angularly multiplexed volume holographic database system (VHDS) was developed and used for storing and searching alphanumeric database records and image data. VHDS operates in three modes: a) the recording mode, b) the addressed-based retrieval mode, and c) the content-based retrieval mode. In the latter mode, the LiNbO3 crystal is illuminated by a search pattern and a reference beam profile is reconstructed with peaks pointing to the addresses of pages that contain the search pattern. These pages can be retrieved later with the system operating in the addressed-based retrieval mode. VHDS has operated in all three modes. Several hundreds of pages of binary data have been recorded and good associative recall with search arguments as small as 1/30th of a page has been demonstrated. A first order analysis of the factors that affect the quality of the reconstructed reference beam profile has been completed. Both digital and analog data can be combined in the same recording and searching is possible with either data type. This functionality can be very useful in multimedia database management systems and a whole array of applications that use different types of data.

Descriptors :   *DATA MANAGEMENT, *HOLOGRAPHY, DATA BASES, MEMORY DEVICES, IMAGES, INFORMATION RETRIEVAL, DATA STORAGE SYSTEMS, ASSOCIATIVE PROCESSING, ANALOG SYSTEMS, LITHIUM NIOBATES, DIGITAL RECORDING SYSTEMS, ALPHANUMERIC DATA, BINARY NOTATION.

Subject Categories : Computer Systems
      Holography

Distribution Statement : APPROVED FOR PUBLIC RELEASE