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Economic production quantity (EPQ) model has been analyzed for trended   demand, and units in inventory are subject to constant rate. The system   allows rework of imperfect units, and preventive maintenance time is random.   A search method is used to study the model. The proposed methodology is   validated by a numerical example. The sensitivity analysis is carried out to   determine the critical model parameters. It is observed that the rate of   change of demand, and the deterioration rate have a significant impact on the   decision variables and the total cost of an inventory system. The model is   highly sensitive to the production and demand rate

EPQ model for imperfect production processes with rework and random preventive machine time for deteriorating items and trended demand