반도체 산업에서 제품의 재고가치 하락과 백오더를 고려한 경제적 산출량 분석

Semiconductor is an industry that requires a large amount of initial investments and correspondingly high fixed cost to produce goods. Conventionally enhancing throughput rate due to the economies of scale based on the cost-driven manufacturing paradigms is a high priority in the industry. However it may cause losses of profit because of the longer flow time and very high inventory level in fast changing market environment. The high throughput policy makes profits even worse if the value of the inventory drops sharply over time. This study develops an economic model to find the optimal throughput rate that maximizes the profit with considering product price decline of inventory in semiconductor. The model uses logistic operating curve (LOC) under queueing theory to capture the changes of inventory levels under variable throughput rates. Results of the numerical experiments show that firm's profits are greatly changed by the inventory level which is related by the throughput rate, demand and price decline. Since an appropriate throughput level enables a firm to maintain a reasonable level of flow time and inventory, the responsiveness on variable demand might be improved as well.