• 한국경영과학회지
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• 제24권4호
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• pp.95-109
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• 1999

We propose a series of methodologies that can evaluate relative efficiency of logistics units(centers) in three categories; managerial, cost, and operational efficiency. Inputs and outputs of logistics systems are first defined. Appropriate quantitative and qualitative measures for the three categories are then selected. Employed also are Analytic Hierarchy Process, Weighted Scoring Method, Stochastic Frontier Model, and Data Envelopment Analysis for the development of a comprehensive assessment scheme. Our scheme not only assesses the degree of relative efficiency of logistics units but also identify the sources of inefficiency in each unit The methodologies are applied to a large telecommunications company which operates 12 distribution centers nation wide. Relative efficiencies of the centers are compared using 1995-1997 performance data. Summarized are the level of efficiency of each distribution center for each of the three categories. The degree and sources of inefficiency of each distribution center are also discussed.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제12권2호
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• pp.51-58
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• 2006

This study is about the Spatial Composition and Area Distribution in the Urban Health Centers. The purpose of this study is to suggest the basic direction of urban health center plans which has urban characters according to the changes of public health systems and environments. The methods of this research was executed by surveys of documents and plans and field observations. The targets of this study are public health centers that have been constructed since 2000 and are constructing until now and investigated this facilities.

• 경영과학
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• 제29권2호
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• pp.21-34
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• 2012

This paper addresses a network design problem in a supply chain system that involves locating both plants and distribution centers, and determining the best strategy for distributing products from the suppliers to the plants, from the plants to the distribution centers and from the distribution centers to the customers. This paper suggests a cooperative coevolutionary algorithm (CCEA) approach to solve the model. First, the problem is decomposed into three subproblems for each of which the chromosome population is created correspondingly. Each chromosome in each population is represented as a permutation denoting the priority. Then an algorithm generating a solution from the combined set of chromosomes from each population is suggested. Also an algorithm evaluating the performance of a solution is suggested. An experimental study is carried out. The results show that our CCEA tends to generate better solutions than the previous CCEA as the problem size gets larger and that the permutation representation for chromosome used here is better than other representation.

• 산경연구논집
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• 제9권2호
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• pp.27-38
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• 2018

Purpose - This study centers on field surveys aimed at deriving the customer satisfaction factors of customer support centers that are positioned between suppliers and consumers in the supply chain. They consists of manufacturing, sales, distribution, consumption and collection, and that are in charge of core functions for suppliers' customer satisfaction management and consumers' satisfaction with consuming activities. Research design, data, and methodology - The customer satisfaction factors of customer support centers were derived through literature review and expert opinion surveys, and a questionnaire was developed through a process of the refinement of variables using pilot tests and 330 questionnaire sheets were distributed. The questionnaire sheets were collected and opinions in them were analyzed using fuzzy AHP methodology. Results - Three factors, which are turnover intentions, motivation, and job satisfaction, were derived as customer satisfaction factors of customer support centers, and the ranking relationships of these three factors were analyzed. In addition, the ranking relationships among six execution variables of turnover intentions, 10 execution variables of motivation, and 10 execution variables of job satisfaction were analyzed using fuzzy AHP methodology to obtain quite significant results. Based on the results of this study, three implications in the three strategic aspects and an implication in the academic aspects are presented. Conclusions - Motivation and job satisfaction, job satisfaction and turnover intentions, and motivation and turnover intentions are not formed by independent or different factors or environments. They are in the same context with each other (maintaining high correlations) and are in the relationships of virtuous circles in which they complement each other.

• 산업경영시스템학회지
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• 제32권4호
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• pp.45-52
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• 2009

The objective of this was to improve a transportation cost relation between Central Distribution Centers(CDCs) and Regional Distribution Centers(RDCs), to control inventory cost concerning safety stock for each service level, by reviewing distribution steps connecting CDCs and RDCs under the price discount. It was also to examine and compare operating costs for the following two alternative suggestions for setting the service standard as a counter measure for a stock-out of the distribution network system management. First, provision by dispersing the safety stock to the CDCs and RDCs; and second, exclusive provision of the safety stock only to the RDCs. The cost comparison analysis was made for each category of purchase costs, regular transportation costs, express transportation costs, and inventory holding costs.

• 산업공학
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• 제12권2호
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• pp.222-236
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• 1999

This paper presents a design and implementation of an intelligent-integrated production-logistics systems. The situation considered here is that there are multiple manufacturing plants and multiple distribution centers. Effective distribution resource and production planning are required to reduce inventory cost and to avoid inventory shortage. We propose an intelligent forecasting scheme of each distribution centers, adaptive inventory replenishment planning, distribution resource planning, and integrated production planning system. In forecasting a huge number of on-line model identification is performed using neural network approximation capability. An efficient adaptive replenishment planning and distribution resource planning are also presented in connection with forecasting scheme. An appropriate production is also requested based on production lead-time and the results of distribution planning. Experimental simulations are presented to verify the proposed approach using real data.

• 경영과정보연구
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• 제32권3호
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• pp.107-125
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• 2013

본 연구에서는 공장-물류센터-고객으로 이어지는 공급사슬 네트워크를 구축하려는 기업의 의사결정에 도움을 주기 위해 2단계 공급사슬네트워크 설계를 위한 수학적 모형을 제시하고, 현실적인 문제를 대상으로 다양한 시나리오를 통한 민감도 분석을 수행하였다. 본 연구에서는 기존의 연구에서와는 달리 공장과 물류센터의 동시 입지선정, 공장과 물류센터의 용량 수준 결정, 공장과 물류센터의 설치 개수 제한과 같은 조건들을 모두 문제에 반영함으로써 현실 상황에 가장 가까운 문제를 대상으로 수학적 모형을 제시하였다. 기존의 연구들은 대부분 근사해를 찾아내는 효율적인 휴리스틱 해법 개발에 초점을 맞추었다. 그러나 본 연구에서는 공급사슬 네트워크 설계를 위해 다양한 시나리오들을 설정하고 각 시나리오별 결과를 분석하여 최적의 의사결정을 내리는데 도움을 주고자 하였다. 이를 위해 문제 크기별로 서로 다른 $5{\times}10{\times}30$, $10{\times}10{\times}100$, $10{\times}20{\times}200$ 등 세 가지 형태의 예제 문제를 만들고 엑셀의 해찾기 기능을 적용하여 풀어 보았다. 이 중에서 공장 후보지 10군데, 물류센터 후보지 20군데, 최종 고객 대리점 200군데인 $10{\times}20{\times}200$ 문제에 대해 공장과 물류센터 설치 개수에 대한 상한 제약조건을 배제한 문제를 추가적으로 풀어 보았다. 공장의 최적 입지 선정 결과를 고정시킨 채 물류센터 설치 개수를 변화시켜 가면서 모두 7가지 시나리오를 설정하여 민감도 분석을 수행해 보았다. 물류센터 설치 개수가 늘어남에 따라 inbound 수송비와 outbound 수송비가 어떻게 변하는지를 알아봄으로써, 기업 입장에서 비용뿐만 아니라 고객의 서비스 수준도 함께 고려하여 의사결정을 내리는데 도움이 될 수 있음을 알 수 있었다.

• 한국유통학회:학술대회논문집
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• 한국유통학회 2003년도 추계학술대회 발표논문집
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• pp.43-63
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• 2003

• 유통과학연구
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• 제13권2호
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• pp.35-44
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• 2015

Purpose - In this study, corporate social responsibility activities as perceived by customers visiting super-centers and the influence of the authenticity of such social responsibility activities on trust have been examined while attempting to verify how trust would influence consumers' attitude and purchase intention. Research design, data, and methodology - For data collection, a questionnaire survey has been conducted on 200 consumers who would visit super-centers, and 161 effective samples have been used for the final analysis. Methodologies such as Cronbach's α, factor analysis, correlation analysis, and structural equation modeling were used. Results - Among corporate social responsibility activities, legal responsibility in particular has turned out to influence consumers rather greatly. Thus, law observance has turned out to be a necessity rather than merely an economic or ethical responsibility; as for trust, trust in the product has turned out to exert more influence on consumers than trust in the enterprise. Conclusions - Corporate social responsibility activities can mean that the complete fulfillment of natural and proper corporate responsibility will secure consumer trust, thus influencing consumer attitude and purchase intention positively.

• 대한산업공학회지
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• 제37권4호
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• pp.289-296
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• 2011

In most distribution centers, products are received from the suppliers in units of pallet, stored in a rack, moved to the picking area for replenishment, picked according to customer orders, and shipped to customers. In some distribution centers, however, replenishment is made in not a whole pallet but only a portion of a pallet load, mainly due to the limited space in the order-picking area; as a result, partially loaded pallets occupy cells in the rack. As the number of slow-moving items increases, more cells are occupied by partially loaded pallets so that fewer empty cells are available for storing full, incoming pallets. This will necessitate the construction or leasing of additional storage space, which will entail significant cost. As an alternative, we propose pallet consolidation, which involves moving a partial load to another partially-loaded pallet in order to create one empty cell in the rack. In this paper, we define three pallet consolidation problems; formulate each problem as a binary integer programming model; and present heuristic algorithms for the problems. The average performance of each of the proposed heuristics is evaluated using simulation.