Department of Computer Science
University of Pittsburgh
Pittsburgh, Pa.

" Electronic mail systems simplify communication but often result in information overload, or sometimes a flood of “junk mail.” Or the horizon are software tools that filter messages according tc criteria defined by the individual. This paper describes one such prototype.

S. Pollock, “Arnie-based message filtering system,” acm Transactions on Office Information Systems, 6(3), 232-54, July 1988

" Drawing curves of various line widths in a bit-mapped graphs system (commonly called “brushing") requires constructing a grid that best approximates the smooth curve. This paper describes an algorithm that handles two classes of situations, producing a best approximation.

K.C. Posch, W.D. Feilner, “The Circle-Brush Algorithm,” acm Transactions on Graphics, 8(1), 1-24, January 1989.

" Databases in the past were repositories of static information, while the knowledge bases of expert systems were repositories...

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