September 1980 - Vol. 23 No. 9
Features
Moving to a new system is costly and error-prone. The problem can be reduced through use of a virtual operating system that disentangles computing environments from their…
An overrelaxation for a numerical inverse of a constant
When division is performed by a power series implementation with additions, subtractions, digit shifts, and multiplications, the convergence rate of the power series is…
Computer system design using a hierarchical approach to performance evaluation
The concept of a hierarchy of performance models is introduced. It is argued that such a hierarchy should consist of models spanning a wide range of accuracy and cost in…
Partial-match retrieval using indexed descriptor files
In this paper we describe a practical method of partial-match retrieval in very large data files. A binary code word, called a descriptor, is associated with each record…