• 산업공학
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• 제15권4호
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• pp.382-390
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• 2002

This paper deals with planning of order-picking warehouse considering the batch order picking for transportation equipments to pick consumers' orders at a time among order-picking methods and a systematic approach method in order to analyze the order-picking warehouse which can perform optimal operation. To estimate an operating time of transportation equipments to carry out order-picking, this paper suggests three operations : first, to design the refrigerated warehouse using warehouse design parameters, second, to calculate the travel time of transporters considering four types of times with the probabilistic picking frequency, and third, to analyze an order-picking warehouse to construct a simulation model with the AutoMod as a simulation tool. We apply this model to a refrigerated warehouse company in Busan.

• 산업경영시스템학회지
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• 제32권1호
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• pp.44-51
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• 2009

A bonded warehouse is the warehouse located in bonded area. It functions not only as a general warehouse but also as a place for managing the work related to import and export bonded goods. As a general warehouse, it uses the rack system to store the goods and the folk lift truck to move the unitized goods. The operation of the storing system closely related to the efficiency of space uses in a warehouse and vehicle working. Thus, vehicle performance measured in distance units in the ware-house could be used as one of the key performance measure in warehouse system. This paper focuses on the operation efficiency of the bonded warehouse which uses rack system for the storing and the folk lift truck for moving goods. The method of load allocation for balancing the rack uses and vehicle operation for maximizing efficiency are the specific concerns in this paper. The simulation study is conducted to find a policy for efficient vehicle operation based on balanced rack utilization, and the favorable result for the system operation would lead the usable proposal in vehicle operation.

• 한국경영과학회지
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• 제3권1호
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• pp.69-73
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• 1978

This paper deals with the problem of determining the optimal inventory-transportation policy of the idealistically simple inventory-transportation system with the following assumptions: (1) The system consists of a single central warehouse and a single local warehouse, (2) The planning horizon is finite, (3) Demand rate is fixed costant, and so forth. Developed is the algorithm by which to identify the optimal inventory policy which minimizes the total cost incurred to the system over the given finite planning horizon. A sample numerical example is presented along with a discussion of the possible applications of the approach used n the algorithm.

• 산업경영시스템학회지
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• 제20권43호
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• pp.139-144
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• 1997

The objective of this study is to establish an actual optimization strategy for the traditional multi-stage distribution system which consists of factory warehouse, central distribution warehouse, and regional distribution warehouse under the basic assumption of distribution system. A minimization algorithm of total operating cost in a multi-stage distribution system was developed by expanding the previously existing algorithm through consideration of additional transportation environment. Alternative non-linear transportation costs for the same travel distance can be applied for the multi-stage distribution system by estimating the corresponding characteristic values through the collection of the actual data representing the change of transportation circumstances.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2006년도 추계학술대회
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• pp.327-331
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• 2006

This paper considers an integrated inventory-distribution system with a fleet of heterogeneous vehicles employed where a single warehouse distributes a single type of products to many spatially distributed retailers to satisfy their dynamic demands and the product is provided to the warehouse via procurement ordering from any manufacturing plant or market The Problem is formulated as an Mixed Integer Programming with the objective function of minimizing the sum of inventory holding cost (at the warehouse and retailers), and transportation cost and procurement ordering cost at the warehouse, subject to inventory-balancing constraints, ordering constraints, vehicle capacity constraints and transportation time constraints. The problem is Proven to be NP-hard. Accordingly, a Lagrangean heuristic procedure is derived and tested for its effectiveness through computational experiments with some numerical instances.

• 산업경영시스템학회지
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• 제34권1호
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• pp.1-8
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• 2011

Controlling industrial vehicle operated by human in warehouse was not simple since the information transfer for controlling the vehicle was not easy. However, as the technology for the WMS (Warehouse Management System) has been advanced and the PDA (Personal Digital Assistant) has come into wide use in a workplace, the control of man-operated vehicle became less difficult as do to AGVS (Automated Guided Vehicle System). This study examines the ways to improve the efficiency of warehouse operation through introducing rule of task assignment for the vehicles, particularly forklift. This study, basically, refer to AGV operation policy because a great number of studies for AGV dispatching rule have been done and the mechanism for the controlling vehicles is very similar. The workers in field prefer to simple dispatching rules such as Shortest Retrieval Time First (SRTF), Shortest Travel Time First (STTF), and Longest Waiting Time First (LWTF). However, these rules have potential disadvantage. Thus, several rules made up by combining rules mentioned above are introduced and these new rules use threshold value or evaluation formula. The effectiveness of these new rules are tested by simulation and the results are compared. This study proposes favorable dispatching rules for forklift in warehouse for the efficiency of the vehicle operation and stability of service level.

• 한국ITS학회 논문지
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• 제13권3호
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• pp.1-9
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• 2014

본 연구는 대형 이벤트가 발생하였을 때 신속하고 정확한 교통정책을 수립할 수 있도록 대형 이벤트 대응형 통합교통분석 시스템을 개발하는 데 목적이 있다. 교통분석 시스템 사례조사를 기초로 통합교통분석 시스템의 요건을 정의하고 개발방향을 수립하였다. 데이터 웨어하우스 (data warehouse) 구축을 위해 신속하고 정확한 교통정책 수립이 요구되는 대형 이벤트를 선정하고 데이터를 수집하였다. 수집된 대형 이벤트 데이터와 교통 데이터를 통합하여 데이터 웨어하우스와 주제별 데이터 마트 (data mart)를 구축하였다. 이용자가 적시에 의사결정을 할 수 있도록 비즈니스 인텔리전스(business intelligence) 시스템 화면을 설계하고 개발하였다.

• 산업경영시스템학회지
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• 제18권34호
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• pp.193-204
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• 1995

Many studies show that the value of the warehouse is good. However, studies explicitly mention the tradeoff between costs of operating the warehouse and benefits from the warehouse. Also, it is important to know when the benefits overcome the costs. We study a one-warehouse/N-retailer(s,Q) distribution system with stochastic lead times in order to answer two questions: "What are the optimal policies of the system that minimizes total system costs\ulcorner" and given the optimal policies, "Is the value of the warehouse always good\ulcorner" We use an analytical model for answering the questions. We find that the optimal policies are different from those with deterministic lead times. In fact it is reverse. We alse find the existence of the breakeven point beyond which the benefits starts overcomming the costs. And, we show that one of the breakeven points is the mean ratio of a supplier's lead time to transportation lead time between the warehouse and the retailer. Finally, we show that the breakeven point is sensitive to the ratio of holding costs of the warehouse and the retailer and it is also sensitive to the unit backorder costs at the retailer.sts at the retailer.

• 대한산업공학회지
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• 제30권4호
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• pp.301-305
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• 2004

In a warehouse, plates listed in the different orders are placed mixed. Nevertheless, when plates are going out, a group of plates listed in the same order should be sequentially loaded on a transporter. Since the access to the plates is only from the top of the stack, it happens often that we have to move some plates on a temporary place in order to access a plate below them. This paper deals with a problem of sequencing orders for transportation to minimize the number of plates temporarily moved.

• 한국항만경제학회지
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• 제27권3호
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• pp.311-329
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• 2011

해운 항만산업은 수출입의 최전선이자 무한한 부가가치를 창출하는 국가적 산업이다. 최근의 세계 경제위기로 인해 항만물동량이 둔화되는 등 우리의 해운 항만산업의 어려움을 겪고 있다. 이러한 어려움은 이를 어떻게 준비하고 대응하느냐에 따라서 새로운 도약을 위한 기회가 될 수 있다. 해운 항만 업체 스스로 끊임없는 노력을 통해 경쟁력을 강화한다면 머지않아 국내에도 외국 해운 항만업체와 당당하게 경쟁할 수 있는 대표적인 업체가 생겨날 것이다. 따라서 본 연구에서는 국내 해운 항만 산업의 경제적 파급효과를 산업연관표를 이용하여 살펴보고자 한다. 산업연관표를 이용하여 해운 항만산업의 경제적 효과를 요약하면, 첫째, 2005년 생산유발계수는 항만시설이 1.958로 가장 높고 다음으로 연안 및 내륙수상운송 1.857, 하역 1.842, 기타 운수관련서비스 1.768, 보관 및 창고 1.676, 수상운수보조서비스 1.422, 외항운송이 1.283 순으로 나타났다. 둘째, 부가가치유발계수를 살펴보면, 수상운수보조서비스 0.924, 하역, 보관 및 창고 0.902, 기타 운수관련서비스 0.885, 항만시설 0.832, 연안 및 내륙수상운송 0.752, 외항운송이 0.258로 가장 낮게 나타났다. 셋째, 2005년 중 수입유발계수를 보면, 외항운송 0.742, 연안 및 내륙수상운송 0.248, 항만시설 0.168, 기타 운수관련서비스 0.115, 하역, 보관 및 창고 0.098, 수상운수보조서비스가 0.076으로 가장 낮게 나타났다. 넷째, 기타 운수 관련서비스(1.125)와 하역(0.882)의 감응도계수가 높고, 항만시설과 외항운송이 0.514로 감응도계수가 낮다. 항만시설(1.006)과 연안 및 내륙수상운송(0.954), 하역(0.946), 기타 운수관련 서비스(0.908)의 영향력계수가 높고, 반면 외항운송(0.659)의 영향력계수가 낮다.