• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2005년도 춘계공동학술대회 발표논문
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• pp.904-913
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• 2005

This paper deals with an integrated problem of inventory control and dynamic pricing strategies for a commodity with price and sales-period dependent demand pattern, where a seller and customers have complete information of each other. The problem consists of two parts; one is each buyer's benefit problem which makes the best decision on price and time for buyer to purchase items, and the other one is a seller's profit problem which decides an optimal sales strategy concerned with inventory control and discount schedule. The seller's profit function consists of sales revenue and inventory holding cost functions. The two parts are closely related into each other with some related variables, so that any existing general solution methods can not be applied. Therefore, a simplified model with single seller and two customers in considered first, where demand for multiple units is allowed to each customer within a time limit. Therewith, the model is generalized for a n-customer-classes problem. To solve the proposed n-customer-set problem, a dynamic programming algorithm is derived. In the proposed dynamic programming algorithm, an intermediate profit function is used, which is computed in case of a fixed initial inventory level and then adjusted in searching for an optimal inventory level. This leads to an optimal sales strategy for a seller, which can derive an optimal decision on both an initial inventory level and a discount schedule, in $O(n^2)$ time. This result can be used for some extended problems with a small customer set and a short selling period, including sales strategy for department stores, Dutch auction for items with heavy holding cost, open tender of materials, quantity-limited sales, and cooperative buying in the on/off markets.

• 한국콘텐츠학회논문지
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• 제14권8호
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• pp.382-393
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• 2014

본 연구는 강원도 폐광지역에 대체산업으로 설립된 강원랜드가 당초 목적인 '낙후된 폐광지역의 균형있는 발전과 주민의 생활 향상'에 얼마나 기여하였는지를 각종 평가지표와 주민의식 설문조사를 통해 실증적으로 평가하여 향후 폐광지역 진흥정책 연구의 기초자료의 제공과 정책적 제언을 제시하고자 하는 목적에서 수행하였다. 지역발전 및 경제력 효과에 대한 영향력을 측정하기 위해 폐광지역 주민들을 대상으로 설문조사를 실시하고 분석하였다. 회귀분석 결과 시사점은 첫째, 연령에서 20대와 비교하여 50대 이상 즉 나이가 많은 주민은 경제적 효과, 공간적 효과, 사회 문화 교류, 삶의 질 효과에 대해 부정적으로 평가하고 있음을 알 수 있다. 둘째, 거주지에서 정선지역과 비교하여 삼척과 영월지역의 주민들은 강원랜드의 입지로 인한 효과에 대해 부정적 평가를 하고 있음을 알 수 있다. 특히 영월지역 주민의 평가가 매우 낮음을 알 수 있다.

• 한국경영과학회지
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• 제34권4호
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• pp.185-204
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• 2009

The USIM(universal subscriber identity module)-unlock introducing in July 1, 2008 might be led to a significant change that mobile service provider's dominance is considerably dispersed to the handset manufacturer and distributor. Under USIM-unlock environment, mobile service provider, handset manufacturer, and distributor have to make their decisions on their handset distribution channel strategies: the closed distribution channel strategy or the open distribution channel strategy. The change of distribution channel strategy between members in distribution channel can be understood as a matter of strategy choice, and we have developed a theoretical model and analyzed how to make a decision for the member's optimal distribution strategy based on 3-person game model between members of mobile phone distribution channel, under both of '1 subscriber-1 handset' and '1 subscriber-multiple handset' assumptions. Under '1 subscriber-1 handset' assumption, the closed strategy controlled by mobile service provider is all players' optimal solution because the maximum size of the mobile phone market is limited by subscribers. But, as total expected profit by the handset and distribution subsides is a deficit, mobile service provider have to choose the open strategy and consider the conversion to MNO(mobile network operator). Under '1 subscriber-multiple handset' assumption, mobile service provider is trying to find the way how to lock-in its service and mobile phone and how to maximize ARPU(average revenue per unit), while handset manufacturer and distributor have to look for the way how to maximize the mobile phone market using their own marketing efforts, because it is expected that total mobile handset demand for the open market is bigger than demand for the closed market under '1 subscriber-multiple handset' assumption.

• 경영과학
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• 제31권2호
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• pp.49-63
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• 2014

With the huge concerns on the inefficiency of public enterprises, particularly a significant amount of debt, an increasing number of studies have been carried out to analyze the levels of inefficiency and investigate the causes of that inefficiency. However, very limited range of analytical methodologies have been used in the efficiency analysis and moreover, the effects of external factors have been little addressed. This study explores the efficiency of urban railway corporations in Korea by utilizing a method of stochastic frontier analysis (SFA). In particular, the potential effects of external factors including residential and floating populations of a station were statistically analyzed. A total of seven Korean urban railway corporations were selected to compare each other in terms of operational efficiency. The results present three important findings. First, the Cobb-Douglas model was found to be more valid for SFA compared to the Translog model. Second, the efficiencies of urban railway corporations in Seoul and Busan are relatively high whereas those of Daejeon and Gwangju are very low in efficiency in the area of sales revenue. In an aspect of number of transport of passengers, Gwangju Metro also showed the lowest efficiency. Third, the external factors are significantly associated with the efficiency, indicating that the efficiencies of Daejeon Metro and Gwangju Metro would increase while the efficiency of Seoul Metro would decreases when the external variables are excluded in the efficiency analysis. The results provide several meaningful implications for managers of the urban railway corporations as well as policy makers who are attempting to resolve the inefficiency problems of public enterprises.

• 보건행정학회지
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• 제17권2호
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• pp.68-90
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• 2007

Nurse staffing level is an important factor that influences the quality of health service and patient outcomes. This study was carried out to examine the current state of acute hospital nurse staffing and find out factors that affect the nurse staffing level. Nurse staffing of individual hospitals was measured using the number of registered nurses per 100 beds. Descriptive and multiple regression analyses were conducted using 592 acute care hospitals' data. Regression model included structure factors such as referral level, ownership, medical and general staffing, and financial outcome factors such as occupancy rate, inpatient and outpatient revenues. Market characteristics included strength of competition, supply of nurses, and income and health status level of consumers. The average number of nurses per 100 beds was 28 and showed a great variation according to the referral level. Regression model explained this variation as much as 76.87%. Hospital structure variables which affecting the hospital nurse staffing level positively were ICU bed ratio, the staffing level of specialist, training doctor and employees except doctor and nursing personnel, while the negative factor was nurse aid staffing level. General hospitals employed more nurses than hospitals. Among outcome characteristics, occupancy rate and the amount of health insurance inpatient revenue affected positively on the hospital nurse staffing level. The more supply of the new nurse and the higher consumer income and health status in the medical service markets, the more nurses were employed by the medical institutes. According to the study result, hospitals employed more nurses when they had more financial incentive by increasing nurses. This means appropriate hospital incentive policy and regulation policy, which hospital violate nurse staffing level have to pay penality, should be needed. Clarifying job description between nurses and nurse aids and the reentry program for unemployed experienced nurses will be helpful to increase nurse staffing level.

• 한국수자원학회논문집
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• 제45권12호
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• pp.1201-1211
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• 2012

본 논문은 순차적인 일국 CGE 모형을 구축하여 국가의 온실가스 저감정책과 연계한 물산업 지원 정책의 경제적 파급효과를 분석하였다. 모형은 물산업과 에너지 부문을 세분화하였으며, 온실가스 저감수단으로 탄소세를 도입하였다. 시나리오는 탄소세수를 가계에 이전하는 경우와 물산업에 지원되는 경우로 구축해 모의결과를 비교분석 하였다. 분석결과 물산업 지원 정책은 GDP 기준 약 0.1% 수준의 온실가스 저감 비용을 절감하고 소비와 투자를 확대하는데 기여하는 것으로 나타났다. 그러나 물산업의 에너지 집약도가 높기 때문에 탄소세 부과로 인한 에너지 대체, 비에너지 집약적 산업구조 전환에의 기여도는 미미하였다. 따라서 온실가스 저감정책 하에서 물산업 발전을 위해 에너지 효율개선, 친환경 에너지 개발 및 활용 증진 등 비용효율적인 물산업 정책 추진이 중요할 것이다.

• 한국정보컨버전스학회:학술대회논문집
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• 한국정보컨버전스학회 2008년도 International conference on information convergence
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• pp.135-140
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• 2008

Recently in the Mongolian wireless marketplace, many E-commerce companies have been making considerable investments in the technological development of M-commerce, taking competitive advantage of new business possibilities offered by Internet-based wireless technologies. In the Mongolian wireless marketplace, this new mobile environment opens the door for new and exciting market opportunities in mobile services and applications. In the near future, these companies will be looking toward M-commerce services as a supplemental source of revenue in the mobile marketplace. This paper examines the roles of M-commerce in the consumers' in order to promote the consumers' loyalty in the booming M-commerce. This paper contains theory that focuses on the basic concepts of the M-commerce environment, its wireless network technologies, and its applications infrastructure. Upon searching for references to assist us in establishing a market hypothesis, we discovered that few comprehensive studies on consumer perspective and behavior related to M-commerce services actually exist in the literature. In the area of M-commerce, many companies neglect the consumer perspective, concentrating only on technological factors only when formulating their market strategies. And, due to technological blindness, many companies were not able to succeed in end-user E-commerce services. Given that fact, this paper formulates a consumer-centric research model. In order to prove the research model, we chose the survey method which allows for the collection of large amounts of data from a sizeable population in a highly economical way. Through the survey, this paper defines consumer's attitudes towards M-commerce services by identifying potential Business-to-Commerce(B2C) applications and its primary target groups in terms of gender and age, and by investigating whether consumers recognize the value proposition of M-commerce applications and services. As shown in the data analysis and results, this research concludes that M-commerce development in Mongolia is still at its infancy, and that the implementation of M-commerce depends not only on technological progress, but also on consumer attitudes and their willingness to adopt M-commerce services. As well, other complex cross-cultural factors-socially, economically, culturally, et cetera-enter strongly into the equation.

• 한국산학기술학회논문지
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• 제15권2호
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• pp.838-844
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• 2014

이 연구는 한 중 FTA의 체결이 추진되고 있는 상황에서 한 중 FTA가 제주 노지감귤 산업에 미치는 영향을 계측 분석하기 위해 수행되었다. 기존의 연구는 한 중 FTA가 전체 감귤산업에 미치는 파급영향을 총생산액 변화만으로 파악하고 있는 한계가 있다. 이 연구는 제주 감귤산업중 재배비중이 가장 높은 노지감귤에 대한 파급영향을 별도로 분석하고 있다. 이를 위해 노지감귤 수급균형모형을 구축하고, 한 중 FTA 타결에 따른 감귤류 시장개방 방식을 몇가지 시나리오로 분류하여 각 시나리오별 파급영향을 계측하였다. 분석결과에 따르면, 한 중 FTA 발효(2014년 가정) 이후 전체 제주 노지감귤 산업의 생산액은 관세 15년 철폐의 경우, 총 4,407억원 수준이 감소하는 것으로 계측되었다.

• 한국시뮬레이션학회논문지
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• 제25권4호
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• pp.93-108
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• 2016

전기차 카셰어링은 친환경차량인 전기차를 여러 사용자들이 함께 이용함으로써 교통부문의 온실가스 발생량을 감소시키고, 동시에 자가용 증가로 인한 공간 및 환경문제를 해결할 수 있는 방안으로 주목받고 있다. 그러나 아직 도입단계에 불과하기 때문에 전기차 카셰어링 시스템의 효율성이나 사업가능성에 대한 연구나 분석이 필요한 실정이다. 이러한 배경하에 본 연구에서는 전기차 카셰어링 시스템의 운영상태와 결과를 분석이 가능한 모형을 개발하였으며, 현재 실시되고 있는 시범사업 내용을 반영하여 시뮬레이션을 실시하였다. 시뮬레이션 결과 전기차 카셰어링 시스템 운영과 관련된 변수들 사이의 관계와 운영효율을 최대화 할 수 있는 최적용량 등을 분석하였다. 시뮬레이션 분석에서는 차량대수와 충전기수가 증가할수록 서비스 제공율은 계속 증가하다가 일정수준에 도달하면 증가폭과 그 효율이 감소하는 것으로 나타났다. 또한 카셰어링 시스템 운영에 따른 수익과 비용을 분석하여 연간 운영 이익을 최대화 할 수 있는 최적 차량대수 및 최적 충전기 수를 도출하였다.

• 국제지역연구
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• 제14권3호
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• pp.157-177
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• 2010

본 연구는 중국의 1985년부터 2008년까지의 각 성 시에 관한 패널데이터를 활용해서 재정분권화가 경제성장에 미치는 영향을 실증분석한다. 재정분권화를 위해 최근에 개발된 지표를 사용하고 지방정부의 자율재량권을 계량화해서 모형에 반영하여 다음의 결론을 얻는다. 인플레이션율의 증가는 중국경제에 긍정적인 영향을 미치는 것으로 나타났는데 이는 필립스커브에 의하면 고용량의 증가로 대변되는 중국경제성장과 상충되는 개념으로서 향후 중국경제의 불안정성을 암시하고 있다. 중국의 WTO가입은 중국경제에 긍정적인 역할을 해온 것으로 나타났는데 이는 고전학파의 자유무역이론을 뒷받침하는 실증결과로 해석할 수 있다. 지출분권화는 중국경제성장에 긍정적인 영향을 미치고, 또한 세입분권화도 지출분권화만큼 크지는 않지만 경제성장에 긍정적인 영향을 끼쳤다. 국세나 지방세를 많이 부과하면 경제성장에 부정적인 영향을 미치는 것으로 나타났고, 기대와는 달리 지방정부의 자율재량권을 계량화해서 반영한 지표는 경제성장과 관련이 없는 것으로 나타났다.