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Scheduling assembly tasks with caterpillar precedence constraints on dedicated machines

Gaia Nicosia and Andrea Pacifici

International Journal of Production Research, 2017, vol. 55, issue 6, 1680-1691

Abstract: In this work, we address the problem of scheduling a set of n non-preemptive tasks on m dedicated machines in order to minimise the makespan. For each task deterministic processing times and a specific processing machine are given, moreover a set of precedence constraints among the tasks are known. We present a heuristic and some lower bounds on the minimum makespan for a relevant case in manufacturing applications, namely when the precedence constraints form a caterpillar graph. A caterpillar is a directed tree consisting of a single directed path and leaf nodes each of which is incident to the directed path by exactly one incoming arc. A number of computational experiments are also performed in order to test the performance of the proposed solution algorithm.

Date: 2017
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