Showing papers on "Data access published in 1973"

Hierarchical storage in information retrieval

Abstract: A probabilistic analysis is employed to determine the effect of hierarchical storage organizations on information retrieval operations The data storage hardware is assumed to consist of n-levels of linearly connected memory hardware with increasing data access times and increasing data storage capabilities A system might, for example, consist of fast semiconductor memory, computer core memory, extended core storage, disk memory, and data cells Equations are derived to predict the effect of such a system on data access times using sequential files, random access files, and structured files employing multiple-hierarchical linked lists

Cellular dynamic memory array with reduced data-access time

Abstract: The letter proposes the implementation of a data shuffle into dynamic memories that features a cellular memory structure, and yields an average data-access time that is proportional to the square root of the memory size.

Providing Bibliographic Services From Machine-Readable Data Bases--The Library's Role

Abstract: Libraries will play a key role in providing access to data bases, but not by subscribing to tape services and establishing local processing centers as is commonly assumed. High costs and the nature of the demand will make this approach unfeasible. It is more likely that the library's reference staff will develop the capability of serving as a broker between the local campus user and the various regional or specialized retail distribution centers which exist or will be established.

Design Philosophy of Large Interactive Systems

Abstract: Publisher Summary This chapter describes design philosophy applicable to large-scale structural mechanics program systems. Engineering applications software suffers from a major shortcoming. In contrast to hardware, and, more recently, certain types of systems and utility software, applications software is seldom produced in an orderly manufacturing process of design, development, and fabrication. A conceptual structure that appears particularly attractive for engineering project-design applications is one of the hierarchies of tables, where a conceptual data item may be either a terminal datum (word, vector, or matrix) or a subtable containing additional data, including sub-subtables. Given a collection of data and program files residing in the database, it is necessary to develop a control mechanism that, on the basis of suitable commands, assembles the necessary components to produce an executable sequence of operations, including the implicit or explicit data access and storage operations. Both implementation and user language are highly environment-dependent, the first being heavily influenced by the organization and operating system of the computer on which the system is to be run, the latter depending on the operational procedures and preferences of the user organization.