• 산업경영시스템학회지
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• 제39권2호
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• pp.103-112
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• 2016

As supply chains are globalized, multinational companies are trying to optimize distribution networks using a hub and spoke structure. In this hub and spoke network structure, multinational companies locate regional distribution centers at hub airports, which serve demands in their corresponding regions. Especially when customers put higher priority on the service lead-time, hinterlands of international hub airports become ideal candidate locations for the regional hub distribution centers. By utilizing excellent airport and logistics services from hub airports, regional distribution centers in the hub airports can match supply with demand efficiently. In addition, regional hub distribution centers may increase air cargo volume of each airport, which is helpful in the current extremely competitive airport industry. In this paper, we classified locational preferences into three primary categories including demand, service and risk and applied the analytic hierarchy process methodology to prioritize factors of locational preferences. Primary preference factors include secondary factors. Demand factor contains access to current and prospect markets. Service factor comprises airport and logistics perspectives. Service factor in terms of airport operations includes secondary factors such as airport service and connectivity. Service factor in terms of logistics operations contains infrastructure and logistics operations efficiency. Risk factor consists of country and business risks. We also evaluated competitiveness of Asian hub airports in terms of candidate location for regional hub distribution centers. The candidate hub airports include Singapore, Hong Kong, Shanghai, Narita and Incheon. Based on the analytic hierarchy process analysis, we derived strategic implications for hub airports to attract multinational companies' regional hub distribution centers.

• 한국철도학회논문집
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• 제17권6호
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• pp.457-465
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• 2014

본 연구는 교통카드자료를 이용하여 승객 OD를 분석하고 서울시 도시철도 최대 혼잡구간인 2호선 외선구간(사당~삼성)의 혼잡도 개선을 위한 통행 수요관리 정책을 제시하였다. 삼성역 이전 목적지 승객과 삼성역 이후 목적지를 가진 승객의 수요를 분리 유도하기 위한 기존 순환선과 삼성역까지 운행하는 단절운행 열차를 혼합으로 운행하는 대안을 제시하였다. 분석결과 순환선 탑승비율이 70%이며 순환선과 삼성행 단절 열차 투입빈도가 1:3일때 최고 11.3%의 혼잡도 개선효과가 있는 것으로 분석되었다. 2호선 혼잡구간을 통과하는 수요를 분리하는 수요관리 대안은 최소의 비용으로 혼잡도를 개선함과 동시에 승객의 쾌적성 개선을 가져올 것으로 기대된다.

• 가족자원경영과 정책
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• 제15권2호
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• pp.147-171
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• 2011

The purpose of this study was to examine low-income households' financial problems and the demand for financial counseling. For these purposes, a survey of 500 low-income households was conducted by an on-line survey company. The results were as follows. First, four types of low-income households classified by income and job criteria were: the not-working poorest (16.2%), the working poor (27.0%), the not-working low-income (13.8%), and the working low-income (43.4%). Also, seven areas of financial problems were found through factor analysis. They included difficulty of survival, insufficient funds for special expenditures, defaults on financial obligation, decrease of income, increase of debts, emotional anguish, and difficulty in meeting living expenditures. 61.6% of respondents requested financial counseling, and 44.5% of them preferred internet counseling to counseling by phone or in-person, while 49.5% desired access to public counseling organizations. The five types of financial counseling content for low-income households that were found through factor analysis were financial planning, credit management, asset management/investment, public support, and use of credit cards. The low-income householders demanded financial planning counseling and pubic support counseling more than the other types of financial counseling. Logistic regression analysis revealed that the demand for financial counseling participation was significantly influenced by age and income. The demand for financial counseling content was age, income, and types of financial problems. Therefore, general financial counseling programs for low-income households should be expanded. Furthermore, those counseling programs can be useful if they not only include credit management but also financial planning, economic support information and savings.

• 한국지진공학회논문집
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• 제15권6호
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• pp.33-44
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• 2011

비탄성요구스펙트럼의 형상은 구조물의 내진성능평가 결과에 많은 영향을 미친다. 비탄성요구스펙트럼은 강도감소계수를 적용하여 탄성응답스펙트럼을 비례축소시킴으로써 얻어질 수 있다. 이 연구는 기존에 많은 연구자들이 제안한 강도감소계수의 공식을 조사하였다. 이 논문에는 과거에 제안된 공식에 따라 작성된 강도감소계수 곡선과 비탄성요구스펙트럼 곡선의 형상 및 특성을 비교하고 있다. 조사된 공식으로 작성된 강도감소계수 곡선의 평균곡선을 구하고, 회귀분석을 통하여 평균 곡선의 공식을 유도하였다. 비교 연구를 통하여, 새롭게 제안된 강도감소계수 공식에 따라 작성된 비탄성요구스펙트럼의 형상은 기존에 제안된 공식으로 생성한 비탄성요구스펙트럼의 평균곡선과 일치함을 확인하였다.

• 실천공학교육논문지
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• 제7권1호
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• pp.77-80
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• 2015

직업교육 훈련의 효율과 참여도를 극대화할 수 있는 방안을 모색하기 위한 신뢰성 높은 수요조사 방법을 찾고자 하는 것을 목적으로 하였다. 정확한 수요조사는 훈련의 질을 높일 수 있는 가장 중요한 요소라 할 수 있다. 뿐만 아니라 부정확한 수요조사에 의한 훈련은 낮은 참여도로 인해 비효율적인 훈련성과를 나타낼 수 밖에 없다. 수요조사는 크게 우편, 전화, 대면, 전자 수요조사 4가지 방법이 사용되고 있다. 본 논문에서는 목포대학교 국가인적자원개발 컨소시엄 사업, 지역 산업 맞춤형 인력양성 사업의 훈련을 위해 실시하였던 수요조사를 설명하였고 그 중 효과적인 수요조사 방법을 제안하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.626-637
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• 2008

철도시설 투자를 위한 경제성 평가에서 수요가 차지하는 비중이 상당히 높음에도 불구하고 기존의 철도투자 평가에 반영되는 수요는 철도 투자이후에 발생되는 유발수요에 대한 고려가 미흡한 실정이다. 따라서 이러한 수요를 반영할 수 있는 기초연구가 필요하다. 본 연구에서는 이러한 철도 투자에 따른 투자이후 전환수요(diverted) 및 유발수요(induced demand)를 계량화하기 위한 조사방법론을 검토하도록 한다. 특히, 유발수요는 전환수요에 비해 조사 및 계량화 방안에 대한 연구가 미흡하므로 유발수요를 중심으로 조사 및 계량화 방법들을 외국의 사례와 국내사례를 비교 검토하여 제시하도록 한다. 이러한 연구 결과는 국내에 철도에 대한 전환수요 및 유발수요에 대한 연구가 미흡한 실정이므로 향후 활용도가 높을 것으로 판단된다.

• 대한안전경영과학회지
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• 제2권4호
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• pp.139-151
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• 2000

Developing a new commercial product, it is need to connect the end users demand of quality to the industrial technology of company. For this reason, this study is to build up the users demand for the imminent marketing product of a certain company by Analytic Hierarchy Process, analyze quantitatively users subjective thoughts collected by Group Consensus, calculate the added-value of users demands and verify the consistency of users opinions by consistency-exponential-calculation. The added value obtained by this method is substituted into a user-demand item of Quality Function Deployment. And, the technical characteristic data transferred from the extracted essential factor for developing and manufacturing a new product is substituted into a technical characteristic item of QFD. The faculty of quality is firstly finished by this procedure. But, because the relation a technical characterization with users demand do not be known in new product, Wassermans method was introduced for the correlation users demand with technology and for the processing and marketing of a new product. The all assumption on this thesis was based on the reliable real data of a certain company.

• 한국경영과학회지
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• 제41권2호
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• pp.1-16
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• 2016

Yield management, which originated from the U.S. service industry, uses pricing techniques and information systems to make demand management decisions. Demand uncertainty is an important factor in the area of demand management. A key strategy to reduce the effects of demand uncertainty is substitution. The most generally known type of substitution is inventory-driven substitution, in which consumers substitute an out-of-stock product by buying a similar or other type of product. Another type of substitution is the price-driven substitution, which occurs as a result of price changes. In this research, we consider two market segments that have unique perishable products. We develop yield management optimization models with stochastic demand based on the newsvendor model where inventory-driven and price-driven substitutions are allowed between products in the two market segments. The most significant contribution of this research is that it develops analytical procedures to determine optimal solutions and considers both types of substitution. We also provide detailed theoretical analysis and numerical examples.

• Industrial Engineering and Management Systems
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• 제6권2호
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• pp.106-118
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• 2007

This paper present a new optimization model to generate aggregate production planning by considering electric cost. The new Time Of Switching (TOS) electric type is introduced by switching over Time Of Day (TOD) and Time Of Use (TOU) electric types to minimize the electric cost. The fuzzy demand and Dynamic inventory tracking with multiple plant capacity are modeled to cover the uncertain demand of customer. The constraint for minimum hour limitation of plant running per one start up event is introduced to minimize plants idle time. Furthermore; the Optimal Weight Moving Average Factor for customer demand forecasting is introduced by monthly factors to reduce forecasting error. Application is illustrated for multiple cement mill plants. The mathematical model was formulated in spreadsheet format. Then the spreadsheet-solver technique was used as a tool to solve the model. A simulation running on part of the system in a test for six months shows the optimal solution could save 60% of the actual cost.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.1260-1262
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• 2004

Direct Load Control(DLC) system is a load management program for stablization of electric power supply-demand. It is a series of acts limiting the demand of selected demand side at peak load or other time periods. Recently, power supply-demand instability due to dramatic increase in power usage such as summertime air-conditioning load has brought forecasts of decrease in power supply capability. Therefore heightening the load factor through systematic load management, in other words, Direct Load Control became necessary. By examining the composition and operation of the DLC system, this paper provides conceptional understanding of the DLC system and help in system research.