• 산업경영시스템학회지
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• 제25권4호
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• pp.16-21
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• 2002

This paper refer to the trade-off between delivery frequency and amount between supplier and discountstores. Discountstores prefer frequent delivery of small amount because of limited storage space, while suppliers prefer less frequent delivery of large amount in order to save transportation cost In this paper we propose a heuristic algorithm to determine the amount of order and the delivery frequency which decreases the expected length of stockout. We also evaluate various order policies for vendor managed inventory system using simulation with real data.

• Management Science and Financial Engineering
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• 제19권2호
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• pp.13-18
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• 2013

In this paper, we analyze the relationship between implementation of information technology and inventory turnover as a measure of operational efficiency. We build a regression model including a dummy variable that indicates whether a firm has been nominated for being good at implementing information technology. By using publicly available data, we have conducted an extensive empirical analysis and found that firms' using information technology is not likely to affect inventory turnover significantly. This result implies that we have to take careful consideration in adapting information technology.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2009년도 추계학술대회
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• pp.203-208
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• 2009

Government and company are unfolding greenhouse gas reduction activity to prevent the effects of global warming. Also, verification business through greenhouse gas inventory construction is spreaded variously. Greenhouse gas verification proceeds by document examination, risk analysis, field survey. Document investigates emission information, calculation standard, emission report, data management system. And through risk assessment result, establish field verification plan. Through study on risk assessment of greenhouse gas inventory verification, wish to reduce risk of verification.

• 사물인터넷융복합논문지
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• 제2권4호
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• pp.27-34
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• 2016

본 논문에서는 웹과 안드로이드 단말을 이용하여 도서 재고를 보다 손쉽게 확인 및 관리하는 시스템을 설계 및 구현하였다. 기존 방식은 해당 서점을 직접 방문한 다음 재고를 확인하는 방식이었으나, 이 경우 사용자 접근성에 불편함이 있으며 재고를 파악하거나 재확인 할 때 번거롭다는 문제점이 있다. 따라서 이러한 불편함을 해소하기 위해 도서 분야별 재고, 도서 구매 요청 및 문의 게시판을 제공하여 실시간으로 해당 도서에 대한 재고 파악, 도서 신청 및 구매 기능을 제공하였다. 또한 push 알림 기능을 통해 주문한 도서에 대한 구매 현황을 웹과 안드로이드 모바일 단말에서 실시간으로 파악 할 수 있도록 하였다. 또한 재고 데이터에 대한 통계 정보를 제공하여 서점 운영자와 이용자들이 손쉽고 편리하게 파악할 수 있는 기능을 설계 및 구현하였다.

• 한국항해항만학회지
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• 제34권2호
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• pp.131-136
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• 2010

The aim of the paper is to solve the problem of customer reduction due to the difficulty of parts sourcing which impacts production delay and delivery delay in SC networks. Furthermore, this paper is to suggest the new inventory policy of MTS in order to solve the problem of current inventory policy. In order to compare two policies, a LCD maker is selected as a case study and the real data for 2007 years is used for simulation input. The maker uses MTO policy for parts sourcing which has the problem of lead time even if it has some advantage of inventory cost. Based on current process. The simulation program of AS-IS model and TO-BE model using ARENA 10 version is developed for evaluation. In a result, the order number of two policies shows that MTO is 52 and MTS is 53. However the quantity of order shows big difference such that MTO is 168,460 and MTS is 225,106. Particularly, the lead time of new inventory policy shows much shorter that that of MTO such that MTO 100 is days and MTS is 16 days. In spite of short lead time by MTS policy, new policy has to take burden of inventory cost per year. Total inventory cost per year by MTS policy is US$ 11,254 and each part inventory cost is that POL is US$ 1,807, LDI is US$ 2,166 and Panel is US$ 7,281. The implication of the research is that the company has to consider the cost and the service simultaneously in deciding the inventory policy. In the paper, even if the optimal point of deciding is put into tactical area, the ground of decision is suggested in order to improve the problem in SC networks.

• Industrial Engineering and Management Systems
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• 제8권2호
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• pp.80-92
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• 2009

This paper addresses the inventory rationing issue embedded in the regional supply chain inventory replenishment problem (RSIRP). The concerned supply chain, which was fed by the national supply chain, consisted of a single warehouse distributing a single product to multiple stores (M-stores) with independent and normally distributed customer demand. It was assumed that the supply chain operated under the order-up-to level inventory replenishment system and had only one truck at the regional warehouse. The truck could make one replenishment trip to one store per period (a round trip per period). Based on current inventories and the vehicle constraint, the warehouse must make two decisions in each period: which store in the region to replenish and what was the replenishment quantity? The objective was to position inventories so as to minimize lost sales in the region. The warehouse inventory was replenished in every fixed-interval from a source outside the region, but the store inventory could be replenished daily. The truck destination (store) in each period was selected based on its maximum expected shortage. The replenishment quantity was then determined based on the predetermined order-up-to level system. In case of insufficient warehouse inventories to fulfill all projected store demands, an inventory rationing rule must be applied. In this paper, a new inventory rationing rule named Expected Cost Minimization (ECM) was proposed based on the practical purpose. The numerical results based on real data from a selective industry show that its performance was better and more robust than the current practice and other sharing rules in the existing literature.

• Industrial Engineering and Management Systems
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• 제14권1호
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• pp.1-10
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• 2015

In this paper, we consider multi-item inventory management. When managing a multi-item inventory, we coordinate replenishment orders of items supplied by the same supplier. The associated problem is called the joint replenishment problem (JRP). One often-used approach to the JRP is to apply a can-order policy. Under a can-order policy, some items are re-ordered when their inventory level drops to or below their re-order level, and any other item with an inventory level at or below its can-order level can be included in this order. In the present paper, we propose a method for finding the optimal parameter of a can-order policy, the can-order level, for each item in a lost-sales model. The main objectives in our model are minimizing the number of ordering, inventory, and shortage (i.e., lost-sales) respectively, compared with the conventional JRP, in which the objective is to minimize total cost. In order to solve this multi-objective optimization problem, we apply a genetic algorithm. In a numerical experiment using actual shipment data, we simulate the proposed model and compare the results with those of other methods.

• 산업경영시스템학회지
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• 제37권1호
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• pp.120-126
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• 2014

This paper deals with the economic value analysis of meteorological forecasts for a hypothetical inventory decision-making situation in the pharmaceutical industry. The value of Asian dust (AD) forecasts is assessed in terms of the expected value of profits by using a decision tree, which is transformed from the specific payoff structure. The forecast user is assumed to determine the inventory level by considering base profit, inventory cost, and lost sales cost. We estimate the information value of AD forecasts by comparing the two cases of decision-making with or without the AD forecast. The proposed method is verified for the real data of AD forecasts and events in Seoul during the period 2004~2008. The results indicate that AD forecasts can provide the forecast users with benefits, which have various ranges of values according to the relative rate of inventory and lost sales cost.

• 한국산학기술학회논문지
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• 제17권1호
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• pp.508-517
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• 2016

본 연구는 한국어판 자살극복력 측정도구의 신뢰도와 타당도를 검증하고자 수행되었다. 연구방법은 방법론적 연구로 2012년 9월부터 12월까지 전북지역 266명의 대학생을 대상으로 자료수집을 실시하였다. 준거도구로 Osman 등(2004)의 Suicide Resilience Inventory-25를 이용하였고, 확인적 요인분석과 Cronbach's alpha 계수를 확인하였다. 확인적 요인분석결과 19문항의 요인적재량의 범위는 .442에서 .767, RMSEA<.08, $CFI{\geq}.9$로 타당도를 확보하여, 최종 19문항 3개의 하위 요인으로 이루어진 한국어판 자살극복력 측정도구(SRI-K)를 최종모형으로 선택하였다. SRI-K의 Cronbach's alpha 값은 .943이었다. SRI-K는 자살극복력을 측정하는데 신뢰도와 타당도가 있는 도구임이 검증되었다. 향후 자살극복력을 측정하는데 SRI-K가 보다 유용하게 활용될 수 있을 것을 기대한다.

• 산업공학
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• 제6권1호
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• pp.47-54
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• 1993

Sequential Numbering System(SNS) is one of the production and inventory management system, which is more effective and practical to minor enterprises than Material Requirement Planning (MRP) system or Just-in-Time(JIT) system. The purpose of the paper is the structured analysis of SNS as the first phase of software development. Data Flow Diagram(DFD), Data Dictionary(DD), and Mini-Specs are used to analyze the system through the second level. The result can be exploited to SNS software design and programming.