An integrated scheduling system with demand forecasting has been developed.
The SARIMA (seasonal autoregressive integrated moving average) model is automated to
forecast the demand. In order to reduce the cost and instability of production scheduling,
a safety inventory determination is also automated additionally. A scheduling system
based on the mathematical model and the efficient optimization approach has been
proposed. The mathematical model has been proposed for scheduling of the entire process
of a PVC (Poly Vinyl Chloride) plant, including production, inventory, packing and
shipment. Additionally, a more efficient optimization approach has been proposed. For
validation purposes, a real PVC process was tested. The optimization result shows that
the proposed mathematical model and optimization approach resulted in an increase of at
least 4.5% in profits, obtaining good results in a reasonable amount of time