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In this paper, we develop a new formulation of changeover constraints formixed integer programming problem (MIP) that emerges in solving a short-termproduction scheduling problem. The new model requires fewer constraints thanthe original formulation and this often leads to shorter computation time of aMIP solver. Besides that, the new formulation is more flexible if the timewindows for changeover tasks are given.

Reducing the Number of Changeover Constraints in a MIP Formulation of a Continuous-Time Scheduling Problem