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Communications of the ACM

Communications of the ACM

The use of quadratic residue research

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Some of the problems of simulating discrete event systems, particularly computer systems, on a conventional digital computer are dealt with. The systems are assumed to be described as a network of interconnected sequential processes. Briefly reviewed are the common techniques used to handle such simulations when simultaneous events do not occur, can be ignored, or can be handled by simple priority rules. Following this, the problem of dealing with simultaneous events in separate processes is introduced. An abstraction of this problem is developed which admits solution for a majority of commonly encountered problems. The technique will either find a method of simulating the parallel events or report that none can be found. In some of the latter cases it is shown to be possible to find a solution by extending the information available to the solution technique, but in many cases the technique becomes computationally unfeasible when the additional information is provided.

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