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김재균,신성환 울산대학교 1991 공학연구논문집 Vol.22 No.2
본 논문은 구입량에 따라 구매 가격과 운송비용이 각각 할인되는 상황하에서 주문 정책을 수립할 때 총비용을 최소화시키는 적절한 주문량을 결정하는데 그 목적이 있다. 본 고에서는 구매 단가의 경우에는 단계할인이 적용되고 운송비용의 경우에는 운송단위별로 할인이 이루어지는 경우에 대한 모델이 제시되었으며 이와같은 할인 계획하에서 최적 주문량을 결정할 수 있는 절차가 제시되었다. This paper deals with an EOQ model in which both the unit purchasing price and the freight cost depend on the quantity of the lot size. The model adopts incremental quantity discounts for the price and a general form of discounts for the freight cost. Investigation of the properties of an optimal solution allows us to develop an algorithm whose validity is illustrated through an example problem.
주문량 종속 신용거래 하에서 재고 종속형 제품수요를 갖는 퇴화성제품의 공급체인 재고모형
Seong Whan Shinn 대한안전경영과학회 2015 대한안전경영과학회지 Vol.17 No.3
본 연구는 공급자(supplier), 중간공급자(distributor) 그리고 고객(customer)으로 구성된 2 단계 공급사슬에서 퇴화성 제품(deteriorating products)에 대한 중간공급자의 재고모형을 분석하였다. 문제 분석을 위해 공급자는 중간공급자의 수요 증대를 목적으로 중간공급자의 주문 크기에 따라 차별적으로 외상 기간을 허용하고, 최종 고객의 수요는 중간공급자의 재고 수준에 따라 선형적(linearly)으로 증가한다는 가정 하에 모형을 분석하였다. 중간공급자의 이익을 최대화하는 경제적 주문량 결정 방법을 제시하였고, 예제를 통하여 그 해법의 타당성을 보였으며, 민감도 분석을 통하여 퇴화율이 재고정책에 미치는 영향을 분석하였다.
Seong Whan Shinn 대한안전경영과학회 2015 대한안전경영과학회지 Vol.17 No.3
본 연구는 공급자(supplier), 중간공급자(distributor) 그리고 고객(customer)으로 구성된 2 단계 공급사슬에서 퇴화성 제품(deteriorating products)에 대한 중간공급자의 재고모형을 분석하였다. 문제 분석을 위해 공급자는 중간공급자의 수요 증대를 목적으로 중간공급자의 주문 크기에 따라 차별적으로 외상 기간을 허용하고, 최종 고객의 수요는 중간공급자의 재고 수준에 따라 선형적(linearly)으로 증가한다는 가정 하에 모형을 분석하였다. 중간공급자의 이익을 최대화하는 경제적 주문량 결정 방법을 제시하였고, 예제를 통하여 그 해법의 타당성을 보였으며, 민감도 분석을 통하여 퇴화율이 재고정책에 미치는 영향을 분석하였다.
Buyer's EOQ model for deteriorating products under order-size-dependent delay in payments
Shinn Seong-Whan,Song Chang-Yong 대한안전경영과학회 2002 대한안전경영과학회 학술대회논문집 Vol.2002 No.05
This paper deals with the problem of determining the buyer's economic lot sizing policy for exponentially deteriorating products under trade credit. Assuming that the supplier's credit terms are already known and the length of delay is a function of the buyer's order size, we formulate the mathematical model and the solution algorithm is developed based on the properties of an optimal solution.
Shinn, Seong-Whan,Song Chang-Yong 대한안전경영과학회 2002 대한안전경영과학회 학술대회논문집 Vol.2002 No.05
This paper deals with the problem of determining the buyer's economic lot sizing policy for exponentially deteriorating products under trade credit. It is also assumed that the ordering cost consists of a fixed set-up cost and a freight cost, where the freight cost has a quantity discount offered due to the economies of scale. We formulate the mathematical model and the solution algorithm is developed based on the properties of an optimal solution.
Seong-Whan Shinn 국제문화기술진흥원 2020 International Journal of Advanced Culture Technolo Vol.8 No.2
In this paper, we analyze the buyer’s joint pricing and lot-sizing model in a two-stage supply chain consisting of the supplier, the buyer and the customer. It is assumed that the supplier will permit a certain fixed period for settling the amount the buyer owes to him for the items supplied in order to stimulate the demand for the product. Generally, credit transactions would have a positive effect to the buyer. The availability of credit transactions from the supplier effectively reduces the cost of holding stocks for the buyer and therefore, the buyer has a lot of price options to choose his sales price for a customer in anticipation of increased the customer’s demand and, as a result, it will appear to increase the buyer’s inventory levels. On the other hand, in the case of decaying products in which their utility decay over time, the decaying rate with time may be expected to reduce inventory levels. In this regard, we need to analyze how much the length of credit period and the decaying rate affect the buyer’s pricing and lot-sizing policy. For the analysis, we consider the situation where the customer’s demand is represented as a linearly decreasing function of the buyer’s sales price. From this perspective, we formulate the buyer’s annual net profit and analyze the effect of the length of credit period and decaying rate of the product on the buyer’s inventory policy numerically.
Joint Pricing and Lot Sizing Policy under Order-Size-Dependent Delay in Payments
Seong Whan Shinn 대한안전경영과학회 2000 대한안전경영과학회 학술대회논문집 Vol.2000 No.05
This paper deals with the problem of determining the retailer's optimal price and order size under the condition of order-size-dependent delay in payments. It is assumed that the length of delay is a function of the retailer's total amount of purchase. The constant price elasticity demand function is adopted which is a decreasing function of retail price. Investigation of the properties of an optimal solution allows us to develop an algorithm whose validity is illustrated through an example problem.
Shinn, Seong-Whan The International Promotion Agency of Culture Tech 2021 International Journal of Advanced Culture Technolo Vol.9 No.3
In this paper we analyze the effect of the credit period on inventory policy under trade credit with ordering cost including a fixed cost and freight cost, where the freight cost has a quantity discount. For marketing purposes, some supplier offers credit period to his buyer to stimulate the demand for the product he produces. The delay in payments during the credit period has the effect of reducing the buyer's capital opportunity cost. It is also assumed that the buyer pays the freight cost for the order and hence, the ordering cost consists of a fixed ordering cost and a variable freight cost which depends on the order quantity. As a result, the possibilities of trade credit and discounts on freight costs are expected to play an important role in the buyer's inventory policy. Based on the economic order quantity inventory model, we analyze how the buyer can determine the optimal inventory policy and we examine the effect of the length of credit period on the buyer's inventory policy.