Home → Magazine Archive → June 1980 (Vol. 23, No. 6)
Table of Contents
ACM President's Letter: “You have a call from Moscow”
Pages 322-323
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 known errors in a test program. House shows that the fault …
Roger House
Pages 324-331
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 activity identified in the United States, Canada, the
…
Jack A. Chambers, Jerry W. Sprecher
Pages 332-342
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 known at the time the intensity is calculated. In a simplified …
Turner Whitted
Pages 343-349
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]. The algorithm is used to compute the total cost of all …
John G. Fletcher
Pages 350-351
ACM forum
Robert L. Ashenhurst
Pages 355-359