Recently, much emphasis has given to study the control and maintenance of production inventories of the deteriorating items. Rework is one of the main issues in reverse logistic and green supply chain, since it can reduce production cost and the environmental problem. Many researchers have focused on developing rework model, but few of them have developed model for deteriorating items. Due to t...

In this paper, we develop an economic production quantity (EPQ) model under machine breakdown and two types of repair (corrective and preventive). also, study the simultaneous effect of holding safety stock and purchasing policy. In order to avoid shortages occurring as a result of the random repair time, in addition to keep safety stock, we suppose that the manufacturer could purchase some qua...

Rule based systems or production rule languages have become an established means of encoding expertise 2]. The evaluation of satisfaction of a set of production rules (match phase in the inference cycle) is computationally expensive 2]. RETE 1] and TREAT 3] are two algorithms that perform this evaluation eeciently. The complexity of these algorithms is O(W C), where W is the number of working m...

This paper proposes a dynamic preventive maintenance strategy for a multi-state deteriorating production system. A real-time operating state can be derived via the healthy index. A time-dependent state transition probability matrix is used to describe the aging and deteriorating system. The current probability transition matrix and the aging factor are estimated based on historical data. Then o...

This paper considers a two-stage assembly flow shop problem (TAFSP) where m machines are in the first stage and an assembly machine is in the second stage. The objective is to minimize a weighted sum of earliness and tardiness time for n available jobs. JIT seeks to identify and eliminate waste components including over production, waiting time, transportation, inventory, movement and defective...

Hairy root systems are formed by transforming plant tissues with the “natural genetic engineer” Agrobacterium rhizogenes. In most plants such as Cichorium intybus L., hairy root cultures have proven to be an efficient system for secondary metabolites production. The effect of Zinc (ZnSO4), a heavy metal, was investigated at different concentrations (0, 1, 5 and 10 mM) on some secondary metaboli...

this paper introduces the general framework of a new system for material flow planning and operations and some of its important aspects. the justification for the new system stems from the short coming of mrp  i/mrp ii in term of its assumptions, particularly in relation to fixed lead times and effectively infinite production capacity. at the heart of the system is an automatic scheduler based ...

This study applies periodic preventive maintenance (PM) to economic production quantity (EPQ) model for a randomly failing production process having a deteriorating production system with increasing hazard rate: minimal repaired and reworked upon failure (out of control state). The minimal repair performs restorations and returns the system to an operating state (in-control state). It is assume...

The Toyota production system (TPS) or lean has long been regarded as a powerful approach for managing manufacturing factories. However, in the early 1990s, the TPS was found not to work when it was applied to Japanese electronics companies. TPS is fit for a stable, but not volatile, business environment such as that which the electronics industry belongs. This volatile environment can be descri...