In the field of applied mathematics, optimization techniques formulate to maximizing and minimizing for an objective function. The purpose problems plays a vital role in inventory management. aim is minimize total cost, which comprises many fluctuating costs such as shortage, ordering, holding cost. this paper, defective items were under classification synchronous asynchronous rework strategy p...

This paper is an extension of Hsu and Hsu (Int J Ind Eng Comput 3(5):939–948, 2012) aiming to determine the optimal order quantity of product batches that contain defective items with percentage nonconforming following a known probability density function. The orders are subject to 100 % screening process at a rate higher than the demand rate. Shortage is backordered, and defective items...

The proposed study considers both product deterioration and production process deterioration in a traditional Economical Production Quantity model. In this model, backlog and rework process are also taken into consideration while the production process is assumed to be imperfect. Unserviceable products will be manufactured as a result. Unserviceable products are kept in storage until the end of...

The basic assumption in the traditional inventory model is that all outputs are perfect items. However, this assumption is too simplistic in the most real-life situations due to a natural phenomenon in a production process. From this it is deduced that the system produces non-perfects items which can be classified into four groups of perfect, imperfect, reworkable defective and non-reworkable d...

While it is widely recognized that additional costs due to rework can have an adverse effect on project performance, limited empirical research has been done to investigate the influencing factors. The research presented in this paper aims to determine the influence of different project types and procurement methods on rework costs in construction projects. Using a questionnaire survey, rework ...

In this paper, Economic Order Quantity ( ) based model for non-instantaneous deteriorating items with imperfect quality, permissible delay in payments and inflation is proposed. We adopt a time-dependent demand function. Also, the effects of time value of money are studied using the Discounted Cash Flow approach. Moreover, we assume that orders may contain a random proportion of defective items...

This paper integrates a cost reduction delivery policy into an imperfect production system with repairable items for the purpose of lowering producer’s stock holding cost. The present paper reexamines a manufacturing lot-size problem studied by a prior paper, and improves its production batch size solution in terms of lowering its inventory holding cost. An n+1 delivery policy is proposed here ...

This paper presents the cumulative impact of poor quality on the cost of product duly taking the case of Indian automobile sector. There are number of factors which are effective in improving the quality of product of automobile industries such as leadership , customer focus , supply chain management , product and process management etc. The cost of quality places a fundamental role to make the...

The main purpose of this study is to investigate the periodic inventory model with backorder price discounts, where shortages are partially backlogged. The application of just-in-time (JIT) philosophy i.e., crashing of the lead-time and setup cost has been carried component wise. Two cases have been discussed viz 1 protection interval demand distribution is known (normal distribution approach) ...