چكيده به لاتين
Abstract:
In a supply chain, raw material is sent from the supplier to the manufacturer, and after production phases, it is delivered to intermediate warehouses, and finally to distributor’s repositories. From theses warehouses, final product is delivered to retailers, and then to final consumers, the customers.
Among the major phases of supply chain, production phase is noteworthy. In this phase, the main focus is on production processes, the production volume, time to finish production process, and also the sequence of producing parts and products. The issue of operation sequence, which is also called the schedule of the operation is one of the subsets of production. In this research field, it is attempted to obtain the optimum order of operation on parts during production phases using various approaches of modeling, and considering different hypotheses such as set-up time, bypass process of production, transportation time between stages, etc. in various stages of the production such as flow shop, flexible shop, etc., This process of optimization can be implemented according to different objectives such as minimizing the overall tardiness, minimizing the number of tardy job, minimizing the time of make span (Cmax), and many other objectives based on single-goal or multi goal situation.
In this thesis, according to the research gap regarding the relationship between supply chain and the sequence of operation, we examined two models that have provided a close correlation between the models of supply chain and the models of sequencing, and common issues of sequencing are considered in the perspective of supply chain. In each model, the decision regarding the most appropriate supplier and prioritizing the production of the goods has been made aimed at minimizing the cost of tardiness and cost of purchase.
These models cover 3 stages of supplier, manufacturer and costumers, such that costumers declare the time of delivery of required components to the manufacturer, and the manufacturer, according to the schedule, manages to purchase required primary parts from various suppliers. Also, each supplier is able to provide a portion of precursors, and the difference between suppliers is determined in release time of the primary part to manufacturers with different sales prices.
Keywords: Supply chain, Sequence of operations, Production planning, Integration
