June 1980 - Vol. 23 No. 6
Features
Comments on program specification and testing
The data processing discipline is in a deplorable state, says Roger House. The author reviews an earlier study, in which programmers were largely unsuccessful in finding…
Computer assisted instruction: current trends and critical issues
The use of computers to assist in the learning situation in a simulation, game, tutorial, or drill and practice mode is reviewed on an international basis with centers of…
An improved illumination model for shaded display
To accurately render a two-dimensional image of a three-dimensional scene, global illumination information that affects the intensity of each pixel of the image must be…
A more general algorithm for computing closed semiring costs between vertices of a directed graph
This note describes a generalization of an algorithm given by Aho, Hopcroft, and Ullman [1], originally derived from the work of Kleene [2] and McNaughton and Yamada [3].…