July 1981 - Vol. 24 No. 7
Features
Operating system support for database management
Several operating system services are examined with a view toward their applicability to support of database management functions. These services include buffer pool…
Representing super-sparse matrices with perturbed values
This paper describes a form of purposeful data perturbation in a linear programming model which pertains to uncertainties in the magnitudes of the matrix coefficients. A…
Polynomial manipulation with APL
A simple but effective method for the manipulation of polynomials of several variables in APL is presented. The method is especially advantageous in situations where more…
On the security of multiple encryption
Double encryption has been suggested to strengthen the Federal Data Encryption Standard (DES). A recent proposal suggests that using two 56-bit keys but enciphering 3…