چكيده به لاتين
Abstract:
This thesis presents an inventory routing problem (IRP) involving perishable products with fixed maximum shelf life. It involves a multi-period multi-product IRP in two-level supply chains, where products are delivered from a single distribution center to several retailers by a homogenous rental fleet of vehicles with limited capacities. Two mathematical models are presented. In the first model assumes that products Remain in retailer's shelves until the end of the shelf life, but in the second model,products that just one period remain to their expiration date, are gathered from retailers. The first objective of both models is to minimize total cost including: inventory cost, fixed and variable costs of transportation and the penalty related to lack of backlog. The second objective of first model is to minimize total expired products and The second objective of second model is to minimize total products that must be collected. because the proposed models are multi-objective, we use ε-constraint method to obtain the pareto solution set then we use augmented ε-constraint method to eliminate the solution with weak efficiency. Finally, a case study is selected to indicate the efficiency and applicability of the proposed models.
Keywords: inventory routing, supply chain, perishable products, augmented ε-constraint, shelf life
