In this paper, a production quantity model with random defective items, service level constraints and repair failure is studied. The existence of only one machine results in limited production capacity and partial backordering. The aim of this research is to determine the optimal cycle length, optimal production quantity and optimal backordered quantity of each product such that the expected to...

in this research, a new control policy for the acceptance sampling problem is introduced. decision is made based on the number of defectives items in an inspected batch. the objective of the model is to find a constant control level that minimizes the total costs, including the cost of rejecting the batch, the cost of inspection and the cost of defective items. the optimization is performed by ...

At the manufacturing plant or while products are being transferred from one supply layer to another, there is a considerable possibility of receiving damaged faulty items mixed in with non-defective commodities. This research focuses on and defective that shipped retailers by their suppliers. The retailer reworks make them non-defective, receives discount cost purchasing items. presented invent...

this paper presents a new approach which is based on quality control in order to optimize supplier selection. using inspections, removing the defected materials and considering penalties for low quality materials are the main factors which we have considered in modeling. in this model costs are divided to three parts: 1- costs of purchasing 2- costs of inspection policy 3- costs of quality and ...

 In this research, a new control policy for the acceptance sampling problem is introduced. Decision is made based on the number of defectives items in an inspected batch. The objective of the model is to find a constant control level that minimizes the total costs, including the cost of rejecting the batch, the cost of inspection and the cost of defective items. The optimization is performed by...

In this paper we consider an imperfect production system which produces good and defective items and assume that defective items can be reworked. Due to the nature of rework process we do not restrict the rework rate to be equal to normal production rate or constant and assume that it is a random variable with an arbitrary distribution function. We also assume as it is true in most real world s...

We develop a model to determine an integrated vendor-buyer inventory policy for items with imperfect quality and planned backorders. The production process is imperfect and produces a certain number of defective items with a known probability density function. The vendor delivers the items to the buyer in small lots of equally sized shipments. Upon receipt of the items, the buyer will conduct a...

In a recent paper, Ouyang et al. [10] proposed a ( , , ) Q r L inventory model with defective items in an arrival lot. The purpose of this study is to generalize Ouyang et al.’s [10] model by allowing setup cost ( ) A as a decision variable in conjunction with order quantity ( ) Q , reorder point ( ) r and lead time ( ) L . In this study, we first assume that the lead time demand follows a norm...

Previous studies in the issue of supply chain models with imperfect quality assumed the defectives could be sold at lower unit price by the end of the inspection process and the lot-for-lot delivery policy was employed. However, in practice, defective items may have no salvage value but may need additional disposal cost to process them. The beginning of the printed circuit board (PCB) industry ...