• 자원ㆍ환경경제연구
• /
• 제26권3호
• /
• pp.451-472
• /
• 2017

OPEC의 생산량 발표는 원유 가격에 중대한 영향을 미치는 공급교란 요인이다. 본 연구에서는 OPEC 발표가 원유 시장에 미치는 영향을 사건연구 방법론을 이용하여 분석하였다. 특히 유가 변동 및 구조변화 시기를 고려하여 유가 기간을 3개 구간으로 구분하고, OPEC의 감산, 증산, 유지 발표가 WTI 원유 수익률에 미치는 영향을 분석하였다. 분석 결과, 각 기간별로 OPEC 발표에 따른 비정상 수익 발생의 정도와 방향이 다름을 확인하였다. 또한 유가 급등기와 급락기를 구분하여 OPEC의 생산량 유지 발표의 영향을 분석한 결과, 유가 급락 조정 기간에 유지 발표에 따른 현저한 양(+)의 비정상 수익이 유의하게 발생하였다. 본 연구는 유가 변동 시기별 OPEC 발표의 영향 및 원유거래 전략에 대한 정책적 시사점을 제공한다.

• 환경정책연구
• /
• 제9권3호
• /
• pp.143-160
• /
• 2010

본 연구에서는 생산 기술적 측면에서 개별 사업체의 투입요소 효율성을 제고함에 따라 절약할 수 있는 전력 사용량 및 이에 따른 온실가스 감축 잠재량을 추정하였다. 이를 위하여 자료포락분석기법(DEA)를 이용하여 제조업체의 투입요소 기술적 효율성을 추정하고 이를 토대로 온실가스 저감량을 추정하였다. 2008년도 제조업체 평균 기술적 효율성은 규모에 대한 보수(Returns to Scale) 가정에 따라 0.467-0.643으로 추정되었다. 이를 토대로 제조업의 전력사용 효율성을 개선함에 따른 온실가스 절감가능량은 전력 사용에 따라 발생하는 총 온실가스 발생량의 17.1-25.5%에 해당하는 양으로 추정되었다. 우리 정부가 2020년까지 온실가스를 BAU 대비 30% 가량 감축하기로 발표하였는데 본 연구에서처럼 제조업체 투입요소의 기술적 효율성을 제고함으로써 이러한 정부 정책 실현을 가시화할 수 있을 것이다.

• 지역연구
• /
• 제15권1호
• /
• pp.63-73
• /
• 1999

It is generally believed that there is a trade-off between economic growth and environmental quality since pollutants are generated in the process of production and consumption of commodities. Several researchers have shown this prevailing belief using the short-term input-output models. The literature, however, shows that there have been few attempts to investigate the relationship using long-term forecasting models. This motivates the current paper. This paper attempts to build a reginal growth model in a partial equilibrium framework taking into consideration the requirements of capital invested for pollutant abatement. Model is largely neoclassical. Labor is assumed to move a region with high utility specified in regional per capita average was income and pollution level while capital is partially mobile to a region with high returns. The regional growth is explored in a phase diagram. The paper shows that there are two stable growth equilibria which a region can converge over time and that the equilibria are distinguished by the initial threshold capital stock that a region holds. If the initial capital stock of a region is over(under) than the threshold size, the region converges to the higher (lower) growth equilibrium over time. Moreover, based on this result an environmental quality enhancing policy is analyzed in the phase diagram. It has revealed that the policy calls for the relocation of growth equilibrium points, specifically speaking, it stimulates an increase in labor stock and a decrease in capital stock. Hence the paper has suggested that the prevailing belief which the environmental policy negatively impacts on a regional economic growth is not always true.

• 수산경영론집
• /
• 제35권1호
• /
• pp.1-22
• /
• 2004

Since the red grouper stock was initially declared to be overfished by the NMFS in September 2002, the Gulf of Mexico Fishery Management Council must prepare for the red grouper rebuilding plan considering the following alternative management policies: Total Allowable Catch(TAC), 5 - month season closure, 1800 - pound trip limit, and 50 - fathom longline boundary. The first concern the Council has is to evaluate the effects of recommended policies and the second is to analyze the impact of management policies on yellow edge grouper. This is because the fleets harvest red grouper also catch yellowedge grouper, the regulations on red grouper are likely to allow fishing effort to be distributed into yellowedge grouper. Therefore, this study is aimed at evaluating the biological and economic effects of management policies considering simultaneously the impact of red grouper regulations on yellow edge grouper by developing a combined red grouper and yellowedge grouper bioeconomic model. The overall results indicate that management policies for red grouper would adversely affect the yellowedge grouper stock if yellowedge grouper is not protected by its regulations. The TAC policy has the most serious impact on the yellowedge grouper stock, while the 1800 - pound trip limit policy minimizes the reduction in the yellowedge grouper stock. However, the target stock size of red grouper is achieved as well as the largest net present value of returns is gained in the TAC policy.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제10권9호
• /
• pp.4487-4507
• /
• 2016

Recently tax authorities in the world have been adopting advanced information technology over the Internet into their processes. Websites that enable filing tax returns and paying tax electronically have been implemented in many countries. However, the tax authorities have difficulties in forcing the mandatory system because taxpayers do not feel comfortable with readily capturing their incomes by the system. This study aims to provide a guideline for successful implementation of the mandatory e-tax invoice system. First, the study foucsed on investigating whether the Korean e-tax invoice system was implemented successfully. Secondly, the study assessed actions that might contribute to its successful implementation. The analyses identify that establishing a free website for small-sized taxpayers and providing various issuing systems for diverse taxpayers are critical for its success. The results also enable the tax administrations aspiring to introduce a mandatory system to emphasize some specific actions, which have significant effects on its desired purposes. Finally, this study presents the various policy implications that previous studies have not provided.

• 한국경영과학회지
• /
• 제31권3호
• /
• pp.81-96
• /
• 2006

We consider a rental company that dynamically manages Its capacity level through capacity addition and return While serving customer with its own capacity, the company expands its capacity by renting items from an outside source so that it can avoid lost opportunities of rental which occur when stock is not sufficient. If stock becomes sufficiently large enough to cope with demands, the company returns expanded capacity to the outside source. Formulating the model into a Markov decision problem, we identify an optimal capacity management Policy which states when the company should expand its capacity and when it should return expanded capacity after capacity addition. Since it is intractable to analytically find the optimal capacity management policy and the optimal size of capacity expansion, we present a numerical procedure that finds these optimal values based on the value iteration method. Numerical analysis is implemented and we observe monotonic properties of the optimal performance measures by system parameters, which are meaningful in developing effective heuristic policies.

• Journal of the Korean Statistical Society
• /
• 제30권4호
• /
• pp.661-666
• /
• 2001

In this paper we consider an M/G/1 queue where the server of the system has a vacation time and the service policy is limited-1. In this system, upon termination of a vacation the server returns to the queue and serves at most one message in the queue before taking another vacation. We consider two models. In the first, if the sever finds the queue empty at the end of a cacation, then the sever immediately takes another vacation. In the second model, if no message have arrived during a vacation, the sever waits for the first arrival to serve. The analysis of this system is particularly useful for a priority class polling system. We derive Laplace-Stieltjes transforms of the waiting time for both models, and compare their mean waiting times.

• 보건행정학회지
• /
• 제6권2호
• /
• pp.91-114
• /
• 1996

In this research, the Data Envelopment Analysis(DEA) was applied to measure production efficiency of Public Corporation Medical Centers(PCMCs) operating in Korea. The focus of this research is triple. First, identifing convenience and usefulness of DEA to measure the relative efficiency among PCMCs. Second, assessing magnitudes of the relative efficiency for each PCMC. Third, adding insights into some factors resulting inefficiency in PCMCs. Then, in this paper technical efficiency and scale efficiency measured by DEA[introduced by Charnes, Cooper, and Rhoides(1978) and Banker, Charnes, and Cooper(1984)] were analyzed and a new separate variable was introduced which makes it possible to determine whether operations were conducted in regions of increasing, constant or decresing returns to scale(in multiple input and output situations). And a multi-factor Tobit analysis was conducted to see which variables are associated with PCMC's efficiency.

• Asian Journal of Innovation and Policy
• /
• 제7권1호
• /
• pp.178-189
• /
• 2018

In this paper, we present a case study of a new emerging business startup involved in smart house appliances. The irreversible investment concept and real-option theory are introduced as the fundamentals of the model. By using games theory we show that the startup's actions can trigger reactions from other firms. The first part covers initial the research and development stage, while the second part covers production and commercialization. The findings of this study suggest that, given a certain amount of initial investment, an open and shared innovation may lead to hurting a firm's investment while strengthening the competitors' position in the market. However, given the sensitivity analysis, when volatility and demand grow favorably, sharing R&D investment is not a bad option for a new player to adjust its position in the market while still maintaining positive returns.

• East Asian Economic Review
• /
• 제25권3호
• /
• pp.233-272
• /
• 2021

The Regional Comprehensive Economic Partnership (RCEP) agreement, signed in November 2020, comes shortly after the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP) entered into force and the US-China Trade War escalated. We use a computable general equilibrium model to assess the long-term effects of these three developments on income, trade, economic structure, factor returns and employment across the world, and especially in Asia-Pacific countries. The results suggest that RCEP could generate income gains that will be almost twice as large as those of the CPTPP, and that the two agreements together will largely offset the substantial negative effects of the US-China Trade War for the world as a whole. All three policy developments, but especially RCEP, will deepen East Asian production networks and will raise productivity and increase wages and employment in much of East Asia. At the sectoral level, regional trade in non-durable and durable manufactures will experience the most growth.