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Abstract
The two stage cyclic queue model with general service time distributions of the Erlang class and with time lags between facilities can be used to model snow removal operations, computer systems, earthmoving operations, etc. The utilization of each facility is computed by an heuristic approach (which is explained in some detail). Tables of utilizations are generated for a special subset of these models and an algorithm to compute utilizations for any general case from these tables is then developed. It is shown that the algorithm presented yields good estimates of the utilizations.