• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.208-211
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• 2009

제4차 전력수급기본계획(2008-2022)과 제3차 신 재생에너지 기술개발 및 이용.보급계획에 의거하여 전력산업기반기금을 통해 우선 구매되는 풍력발전이 계통한계가격(SMP, System Marginal Price)에 미치는 영향을 점검하였다. 제4차 전력수급기본계획(2008-2022)에서 향후의 전원설비건설계획과 전력수요를 참고하고, 제3차 신 재생에너지 기술개발 및 이용 보급계획에 의거, 풍력발전보급계획을 반영하였다. 발전변동비의 변화는 미래의 화석연료변동에 따를 것으로 보아 명목상승률 3%, 6%, 그리고 8%의 경우를 검토하였다. 현재는 풍력발전용량이 전체발전용량에 비해 미미해서 SMP에 큰 변화를 가져다주지 못하고 있지만 2014년에는 SMP가 결정되는 구간이 LNG발전기에서 유연탄발전기로 옮겨감에 따라 SMP차이가 최대 20.02[\/KWh](발전 비용 명목 상승률8%)에 달하다가 2020년에는 다시 0[\/KWh](발전비용 명목상승률8%)으로 줄어드는 것으로 분석되었다.

• Journal of the Korean Society of Propulsion Engineers
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• v.10 no.3
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• pp.60-66
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• 2006

Notable are the burning rate characteristics of solid propellant burning at extremely high pressure(10000-20000 psia). The burning rate test using closed bomb shows the discontinuous increment around 4000 psia so that the exponent of burning rate(n) is almost double, from 0.4 to 0.8. The pressure-increasing rate of the test motor is about 300 times as high as that of the motor operating at the conventional pressure, less than 2000 psia, is, therefor the burning rate is augmented about 5-50 times. The performance prediction reflecting the pressure-change-rate effect are fairly comparable with the test data at various test conditions.

• The Korean Journal of Financial Studies
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• v.3 no.2
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• pp.203-233
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• 1996

본고(本稿)는 우리나라, 미국 그리고 일본의 장외시장에 등록된 기업의 특성을 업종별, 규모별, 소유자별, 주가 수준 및 상승률 등의 측면에서 살펴보았다. 우리나라의 주식장외시장 등록기업의 자본금 규모는 매우 적어 거래소 시장에 상장된 기업의 평균 자본금 규모의 1/8수준에 머물고 있으며 주가 수준도 매우 낮은 것으로 조사되었다. 첨단기술집약형 벤처기업이 많이 상장되어 있는 미국과는 대조적으로 우리나라 장외시장에는 건설업 및 금융업 관련 기업이 많이 등록되어 있다. 그리고 장외시장 등록기업의 평균주가는 거래소 상장기업의 절반 수준에 머물고 있는 것으로 조사되었다. 미국의 장외시장에 등록된 기업은 주로 정보기술 (소프트웨어 및 하드웨어), 통신, 의약품, 생명공학 등의 업종과 관련한 기업이 많으며 또한 금융업(은행 및 보험 포함)과 관련된 기업도 많은 것으로 조사되고 있다. 그리고 NASDAQ시장에서 주가 상승률 등의 기준에서 좋은 성과를 나타내고 있는 기업도 대부분 컴퓨터 및 생명공학 관련 기업인 것으로 밝혀졌다. 특히 지난 5년 동안 높은 주가 상승률을 기록한 기업의 조사에서 상위 10개 기업에 NASDAQ시장 기업이 5개나 포함되어 있기도 하여 미국의 장외시장은 투자자들에게 고수익을 제공하는 시장으로서도 충분히 인식되고 있다. 그런데 미국에 비해 장외시장이 기업의 자금조달 창구로서 그 역할이나 기능이 미흡한 일본의 장외시장은 도소매업 및 서비스의 기업이 많이 등록되어 있어 미국의 현황과는 대비를 이루고 있다. 자본금 규모면에서 보면 10억엔에서 20억엔에 해당되는 기업이 가장 많으며 장외시장 등록기업의 소유자별 분포를 주식수 기준으로 보면 사업법인과 금융기관이 소유하고 있는 비율이 49.5%를 시현하고 있다. 그리고 주가 수준은 1,000엔과 3,000엔 사이에서 주로 형성되고 있는 것으로 나타났다.

• Korean Journal of Environmental Biology
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• v.20 no.2
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• pp.165-172
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• 2002

The combined action of two factors on organisms can be either antagonistic, non-effective, additive or synergistic. Although synergism is of biological importance, the common features of synergistic interaction between harmful environmental factors are largely unknown. The purpose of this study is to establish general rules describing the response of various organisms to the combined action of heat with another inactivating agent. Synergistic interaction due to the simultaneous treatment of hyperthermia with ionizing or non-ionizing radiation has been analyzed using the experimental data mainly obtained with yeast cells. In addition, the results reported by others for viruses, bacterial spores, cultured mammalian cells, plants and animals were also analyzed to check the regularities revealed. The common rules of the synergistic interaction obtained in this study can be summarized as follows. For any constant rate of exposure, the synergy can be observed only within a certain temperature range. An increase in exposure rate resulted in an increase of this specific temperature and vice versa. For a constant temperature at which the irradiation occurs, synergy can be observed within a certain dose rate range. As the exposure temperature is reduced, the optimal intensity decreases and vice versa. A new conception taken into consideration those regularities can make a clue for environmental disaster preventive analysis of the synergy of radiation with the other factor.

• Journal of Korean Society of Environmental Engineers
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• v.33 no.9
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• pp.656-661
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• 2011

The performance of a domestic ceramic membrane with pore size of $0.1{\mu}m$ was evaluated to produce drinking water. A pilot-scale ceramic membrane filtration plant with a capacity of $1m^3/d$ was operated at the filtration flux of $3.0m^3/m^2{\cdot}d$ to investigate the effect of both backwash interval and pre-ozonation on TMP (trans-membrane pressure) increasing rate. The TMP increased with increasing the backwash interval. However, the application of pre-ozonation reduced the TMP increasing rate remarkably. When 1 mg/L of ozone was dosed with contact time of 5 min, TMP increasing rate at the backwash interval of 1 hr was reduced by 30%. This result indicated that pre-ozonation was very effective in reducing membrane fouling. There was almost no change in TMP increasing rate when the ozone contact time was maintained in the range of 5 to 15 min. Increasing ozone concentration up to 3 mg/L showed beneficial effect on TMP increasing rate.

• Journal of the Korea Convergence Society
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• v.10 no.1
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• pp.177-186
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• 2019

The purpose of this study is to examine the trend of export growth rate and rate of change by each port/airport in Korea. And to analyze which each port/airport are showing a high growth rate. To this end, Incheon Airport, Busan, Incheon, Ulsan, Gwangyang and Pyeongtaek were selected in order of export value. The analysis period for each port/airport was 200 monthly data from September 2001 to April 2018. Pyeongtaek, Incheon and Gwangyang are relatively larger than Busan and Ulsan in the rate of increase and change. This is because export to China and Southeast Asia has increased more than in the US and Japan. As a result of the analysis, exports from Busan, Incheon Airport and Ulsan have recently been shifted to Incheon Airport, Incheon, Gwangyang and Pyeongtaek. In addition, the export portion of Incheon International Airport, which is an aviation logistics service, is growing more and more. In the west coast era, interest and investment in Incheon, Pyeongtaek and Gwangyang seem to be more needed in preparation for import and export to China, Southeast Asia and North Korea.

• International Area Studies Review
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• v.21 no.4
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• pp.141-158
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• 2017

The purpose of this study is to firstly estimate the inflation rate of North Korea using relative purchasing power parity. Most of the existing studies use North Korean rice prices as proxy to explain changes in North Korean prices. In this study, North Korea's price was estimated by applying purchasing power parity, which was used to estimate the price of socialist countries in the past, to North Korea. Second, it analyzes the impact of North Korea's price inflation after the institutional change of currency reform. We looked at the movements of North Korean prices after the institutional change of currency reform and compared it with the post-monetary reform of other socialist countries. We examine the impact of currency reform on North Korea, focusing on the price. As a result, after the currency reform in 2009, North Korea experienced hyperinflation. The North Korean inflation rate in the model was 3,010.0% in 2010, 195.0% in 2011, 68.0% in 2012 and 48.3% in 2013. After the currency reform of North Korea, the inflation rate is much higher than the socialist countries such as China and Vietnam who had experienced currency reform before. North Korea's monetary reforms are considered to have failed because of the side effects of hyperinflation.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.35 no.4
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• pp.308-315
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• 2007

This study is performed to find out the climb performance of light airplane, Chang Gong-91, as a part of flight test to acquire the certification. Chang Gong-91 is a 5-passenger light aircraft of normal category with single reciprocating engine, and the first officially certified by Korean Ministry of Construction and Transportation in 1993. These flight test procedure and data for climb performance are used to get type certification. We have got maximum climb rate for operating altitude, best angle of climb speed, best rate of climb speed, and absolute ceiling of Chang Gong-91 using drag polar data reduction method from sawtooth climb flight data. Also we compare the form drag coefficient from the results of climb performance and Oswald's effectiveness coefficient to design values using lift-drag curve of light airplane.

• Journal of Cadastre & Land InformatiX
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• v.45 no.2
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• pp.203-216
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• 2015

This study focuses on the relationship between housing sale prices and Jeonse prices, amid a recent surge of Jeonse price and Jeonse-to-housing sale price ratio. There are many studies about the relationship between house prices and Jeonse, but they couldn't fully explain what makes them spike up. In addition to this relationship, this paper deals with the difference of Jeonse system on regions and price levels. Using Granger causality and Spearman's Correlation Coefficient, the outcome is drawn. As the result, the expected rate for housing sale prices effects on the Jeonse-to-housing sale price ratio. The higher on sale price, the lower the Jeonse-to-housing sale price ratio regarding the region difference.

• The Korean Journal of Financial Studies
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• v.8 no.1
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• pp.1-20
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• 2002

이 논문에서는 1991년 1월부터 2000년 12월까지의 납세 후 CD수익률 자료와 소비자물가지수 자료를 사용하여 우리 나라 금융시장에서 단기적 피셔효과가 존재하는지를 검증하고자 시도하였다. Fama(1975)의 방법에 따라 3개월 물가상승률을 CD수익률에 관해 회귀분석한 결과, CD수익률이 미래 물가상승률의 예측치로서 충분한 역할을 하지 못한다는 결과를 얻었다. 단기적 피셔효과를 검증하기 위하여 CD수익률을 기대물가상승률에 관하여 회귀분석하였다. 기대물가상승률은 상수 및 시간추세와 계절성을 반영하는 부분과 확률적 부분으로 구분하고, 확률적 부분이 랜돔워크 모형에 따르는 경우와 AR(1) 모형에 따르는 경우에 대해 기대물가상승률을 구하였다. 랜돔워크모형에 의해 예측하든 AR(1)에 의해 예측하든 기대물가상승률의 회귀계수는 유의한 양(+)의 값이긴 1보다는 훨씬 작은 값으로 추정되었다. 이것은 우리나라의 CD수익률에 단기 피셔효과가 부분적으로만 존재하고 있다는 것을 의미한다. 그리고 AR(1)을 사용하여 예측한 기대물가상승률이 랜돔워크모형을 사용한 경우보다 나은 추정결과를 보여주고 있다.