• 한국수소및신에너지학회논문집
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• 제19권2호
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• pp.145-155
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• 2008

This paper deals with an economic evaluation of hydrogen production by fermentation. We evaluate the economic feasibility of domestic hydrogen production by fermentation utilizing glucose and waste water sludge in terms of hydrogen production prices. In addition, we make some sensitivity analysis of hydrogen prices by changing the values of input factors such as the price of glucose, the capital cost of the hydrogen production system, and the hydrogen production yields. The estimated hydrogen prices of the two-step dark-light hydrogen production by fermentation utilizing glucose was $5,347won/kgH_2$, and the single-step hydrogen production by anaerobic fermentation utilizing waste water sludge was $4,255won/kgH_2$, respectively. It is expected that the hydrogen production price by anaerobic fermentation can be reduced if we produce methane or hydrogen utilizing by-products such as alcohols and organic acids, or the government imposes some legal regulations on the treatment of waste water sludge.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.772-774
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• 2005

Interstate electric power system, as an alternative for energy cooperation under regional economic bloc, has been hotly debated before progressing the restructure in electric power industry and rapidly expanded in many regions after 1990s. Especially, since northeast asia has strong supplementation in resource, load shape, fuel mix etc., electric power system interconnection in this region may bring considerable economic benefits. Moreover, since Korean electric power system has a great difficulty in a geographical condition to interrupt electricity transaction with other countries, it has been expanded as an independent system to supply all demand domestically. As a result, Korean electric power system makes considerable payment for maintaining system security and reliability and expands costly facilities to supply a temporary summer peak demand. Under this inefficiency, if there are electricity transactions with Russia via the North Korea route then economic electric power system operation may be achieved using seasonal and hourly differences in electricity price and/or load pattern among these countries. In this paper, we estimate price cap of transacted electricity via interstate electric power system in northeast asia. For this study, we perform quantitative economic analysis on various system interconnection scenarios.

• 한국산림과학회지
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• 제99권4호
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• pp.573-579
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• 2010

본 연구는 국립공원 탐방수요와 경제변수인 산업생산지수와 소비자물가지수 간의 관계를 분석하였다. 인과 관계검정 결과 산업생산지수와 소비자물가지수는 국립공원 탐방수요에 영향을 미치는 것으로 나타났다. 또한 충격반응분석 결과 산업생산지수와 소비자물가지수가 단기적으로 큰 반응을 보이기 시작하여 장기적으로 파급효과를 미치는 것으로 나타났다. 그리고 분산분해분석 결과 국립공원 탐방수요는 자체변수에 가장 영향을 많이 받는 것으로 나타났다. 이상의 연구 결과 경제변수는 휴양의 수요를 예측하고 정책을 수립하는데 유용하게 활용될 수 있을 것으로 판단된다.

• 국제지역연구
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• 제14권1호
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• pp.77-97
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• 2010

최근 국제자원시장의 불안정성으로 인해 카스피해 연안 국가에 대한 관심이 고조되고 있다. 이들 국가들은 자원수출 중심으로 성장하고 있으며, 특히 카자흐스탄은 최근 10년간 높은 경제성장률을 달성하였다. 그러나 자원에 대한 수출의존도가 높은 경제구조를 가진 국가들의 경우 경제 전반이 국제자원 시세변동에 따라 크게 영향을 받을 수 있으며, 지속적인 경제성장을 저해하는 네덜란드 병에 노출될 수 있다. 최근 카자흐스탄은 우리나라와 교역 및 투자가 증가하는 등 새로운 에너지 공급처로서 대두되었다. 따라서 카자흐스탄의 경제변화는 우리나라에 있어 주요 이슈라고 할 수 있다. 이 연구에서는 카자흐스탄 경제에 네덜란드 병의 원인을 파악하기 위해 Balasa-Samuelson모형을 수정하여 1999년 1월부터 2008년 12월까지를 표본 대상 기간 동안 국제유가와 이자율, 카자흐스탄 실질환율 간의 관계를 분석하였다. 실증분석 결과 전체 표본 기간 내 국제유가와 이자율은 실질환율과 장기적 균형관계를 보이는 것으로 나타났다. 이 기간 내 국제유가와 이자율은 실질환율에 각각 부(-)의 영향을 미치는 것으로 나타나 카자흐스탄은 네덜란드 병에 노출되어 있음을 확인하였다.

• Journal of the Korean Statistical Society
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• 제8권2호
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• pp.139-163
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• 1979

Utilization of the aggregation concept applied in economics has been a traditional way of describing the state of an economic system and of predicting the future economic conditions. In addition, certain aggregate variables have also played a crucial role as indicators of the business cycle. Quick examples would be the price index, the productivity changes, the industrial production index, GNP, and so on. The methods of aggregation could be either simple summations, like GNP, or sophisticated weighted average, like the price index.

• 한국경영과학회지
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• 제14권1호
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• pp.51-58
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• 1989

A joint economic ordering problem between supplier and customer has been formulated where a supplier has to pay the freight cost which follows the principle of economy of scale. An algorithm is given to determine order size and price simultaneously which give gains to both parties. A scenario is presented within which both parties come to a mutual agreement on the revised order size and price by utilizing quantity discount schedule.

• 대한산업공학회지
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• 제22권3호
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• pp.473-483
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• 1996

For situations where there are several markets with different price/cost structures, economic complete inspection plans are developed for determining the market to ship the product to. Two complete inspection plans are considered; the plan based on the performance variable of interest, and the plan based on a variable which is correlated with the performance variable. Profit models are constructed which involve selling price, cost incurred by imperfect quality, and quality inspection cost. Methods of finding the optimal complete inspection plans are presented and a numerical example is given.

• Journal of the Korean Statistical Society
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• 제3권1호
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• pp.17-30
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• 1974

There are a number of studies on the peculiarities of inflation in underdeveloped economies. These studies are, however, confined to the cases of Latin American countries, and the essence of methodologies applied in the studies is basically estimations of linear parameters of an extended quantity equation with lagged variables. As it is generally observed, inflation in most of underdeveloped economies are, to some extent, affected by non-economic factors such as political instability, social disorder, abrupt institutional changes, etc. Sometimes, these factors underlying the basic movement of price level change are reflected in such variables as quantity of money supply, income velocity, gross national product.

• Ocean and Polar Research
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• 제26권2호
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• pp.187-197
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• 2004

The purpose of this paper is to investigate economic feasibility of manganese nodules in Korea area (Clarion-Clipperton Fracture Zone). We assumed that the production scale of manganese nodules were 3.0MT or 1.5MT and analyzed that the capital cost and operating cost were estimated in the four sectors, exploration, mining, transportation and metallurgical process. The capital cost and operating cost evaluation reflects the latest technical practices. First, for analyzing economic feasibility, the scenario suggests that the production of 4 metals can be made for 25 years. Assuming the discount rate at 8.0%, equity capital at 50% and tax at 27%. When manganese nodule were mininged 3.0 MT, economic feasibility analyses showed that IRR was 12.8 and pay-back period was 9.2 years, and when manganese nodules were mininged 1.5 MT, economic feasibility analyses showed that IRR was 4.0 and pay-back period was 11.8 years. This study indicated there is economic validity of at the product of manganese nodules 3.0 MT. In addition, we carried out a sensitivity analysis at the change of cobalt price on mining 1.5 MT. The result of sensitivity analysis clearly showed that economic validity is high at increasing of cobalt price 50% up.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.165-170
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• 2021

This paper examines the long-run relationship between financial development and economic growth. The effective function of financial development is crucial to promote the economic development of the country. To achieve the objective, this study used Gross Domestic Product as a dependent variable and Credit to The Private Sector, Ratio of the Gross Fixed Capital Formation to GDP, Trade, Consumer Price Index and Labour Force as an independent variable. Augmented Dickey-Fuller test statistic (ADF) to check the stationary. Bounds test for cointegration and Auto-Regressive Distributed Lag Models (ARDL) are used to check cointegrating relationship amongst the variables and causality between financial development and economic growth. Moreover, the Model selection method is Akaike Info Criterion (AIC). This result demonstrates that the labor force and trade hold a significantly negative relationship with economic growth. Nevertheless, inflation, Credit to The Private Sector, and Ratio of the Gross Fixed Capital Formation to GDP show a significantly positive relationship with economic growth. Therefore, there is a statistically significant relationship between Financial Development and Economic growth in Sri Lanka and the Sri Lankan government should reform its trade policies.