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박호용,윤성환,노범석,이원주,최재혁,Park, Ho-Yong,Yoon, Sung-Hwan,Rho, Beom-Seok,Lee, Won-Ju,Choi, Jae-Hyuk 해양환경안전학회 2019 海洋環境安全學會誌 Vol.25 No.6
본 연구에서는 국내외 저탄소 녹색성장을 위한 대안으로서 수소에너지와 그 이용 기술에 대한 관심이 높아지는 추세에 발맞춰 무탄소 연료인 수소를 LNG 의 주성분인 메탄, 메탄-프로판, 메탄-프로판-에탄 동축류 확산화염 내에 첨가하여 화염형상 및 연소생성물에 미치는 영향을 확인하였다. 상온상압 조건의 확산화염에 수소를 단계적으로 첨가하여 실제 생성되는 연소생성물의 변화 추이를 가스 분석기를 이용하여 실험적으로 관찰하였고 확산화염의 형상은 디지털카메라를 이용하여 단계적으로 관찰 하였다. 실험결과에서 확산화염에 수소를 첨가함에 따라 질소산화물의 생성량이 선형에 가깝게 증가하는 경향을 보였다. 이것은 수소의 상대적으로 높은 단열화염온도와 빠른 연소속도가 Thermal NOx의 생성을 촉진했기 때문이다. 반면 이산화탄소의 생성량은 감소하는 경향이 나타났는데 수소를 첨가함에 따라 메탄, 메탄-프로판, 메탄-에탄-프로판의 혼합 확산화염에 포함되어있는 전체 탄소비율이 줄어들어 이산화탄소의 생성량이 감소한 것이다. 이는 선박에서 LNG-수소의 혼합 연료사용으로 인해 온실가스인 이산화탄소를 저감할 수 있는 하나의 방안으로 고려될 수 있다는 것을 의미한다. As a carbon-free, green growth alternative, internal and external interest in hydrogen energy and technology is growing. Hydrogen was added to co-axial methane, methane-propane, and methane-propane-ethane diffusion flames, which are the main ingredients of LNG, to evaluate its effect on flame formation and combustion products. The variation in combustion products produced by adding hydrogen gradually to diffusion pyrolysis at room temperature and normal pressure conditions was observed experimentally by using a gas analyzer, and the shape of diffusion pyrolysis was observed step by step using a digital camera. The experimental results showed that the production volume of nitrogen oxides tended to increase and became close to linear as hydrogen was added to the diffusion pyrotechnic. This is because the relatively high temperature of heat insulation and fast combustion speed of hydrogen facilitated the production of thermal NOx. On the other hand, CO2 production tended to decrease as hydrogen was added to reduce the overall carbon ratio contained in the mixed diffusion flame of methane, methane-propane, and methane-ethane-propane. This means that the mixed fuel use of LNG-hydrogen in ships may potentially reduce emissions of CO2, a greenhouse gas.
박호용(Ho-Yong Park),박민로(Min-Ro Park),윤명환(Myung-Hwan Yoon),임명섭(Myung-Seop Lim),홍정표(Jung-Pyo Hong) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Multi-layer magnet IPMSM is often used for high-power motor due to the benefit to increase reluctance torque under the same current condition. But when it is designed for high-speed motor, mechanical condition should be considered. That is because the centrifugal force applied to a rotor increases the mechanical stress as the speed is higher. If maximum mechanical stress of the designed model is over the required specification, it cannot be used as high-speed motor. In this paper, the method for relieving stress concentration is suggested using two-layer magnet IPMSM model. The mechanical stress is analyzed by adjusting various design factors of the rotor such as thickness of Permanent Magnet (PM), position of PM, thickness of bridge. At this time, the shape of stator is not changed. Also, the way to distribute mechanical stress concentration and the analysis condition are suggested. Using this method, the maximum mechanical stress is decreased under the required condition, keeping the target torque. Both electrical characteristics and distribution of mechanical stress are analyzed using 2-D Finite Element Analysis (FEA), and this will be helpful to design the high speed motor.
박호용(Ho-Yong Park) 한국관세학회 2013 관세학회지 Vol.14 No.3
This paper attempts to examine the possibility of improving terms of trade of Korea in the situation of new protectionism. Traditional trade theory provides the rationale of liberalizing measures as Pareto optimum for the Korea that is assumed as small open-economy. This rationale connotes, however, the predictable problems that Korea is no longer small country in a certain point of views; trade items and trade partners. According to the 12th GTA reports, from June 2012 to May 2013, more than three times as many protectionist measures were imposed by governments around the world than liberalizing measures. G8 nations were collectively responsible for 30% of protectionist measures imposed during the last 12 months. G8 nations are being hit frequently by beggar-thy-neighbour policies, while Korea is being harmed by protectionist measures more frequently than any other countries. This paper studies analytically the background of new protectionism under the assumption of economic large country and try to find out statistical consequences to make inferences from the data. The consequences shows that GDIs of U.S.A and Republic of Korea are recorded as lower than GDP because of negative gains of trade since 2005. This infers that the current loss of trade will be followed by a period of new protectionism. We propose that we should basically prepare liberalizing measures, because Korea is traditionally aimed at full opening world and a open-economy export-oriented. On the other hand, we selectively prepare protecting measures as a means of side-stepping the established WTO disciplines, because Korea is no longer small country in a certain point of view, such as key industries and mainly large importables, which are influence on the world market. Specific protective measures mentioned above are discussed.
박호용(Park Ho-Yong) 한국관세학회 2005 관세학회지 Vol.6 No.3
We attempt to study the effects on the rice market in Korea under the special treatment(hereafter MMA or delayed tariffication) and ceasing to apply the special treatment(hereafter tariffication). Japan and Taiwan that were in delayed tariffication had changed the policy in the rice market to tariffication. Two countries show quite different economic effects of the tariffication. Japan has been stabilized in the rice market while Taiwan experienced of sharp decrease in the price. Special treatment for rice shall be extend for an additional 10 years until 2014 in Korea, however, Korea has a right to choose alternatives: tariffication or MMA. Under certainty, tariffication and MMA are equivalent in terms of economic welfare in the static model. There is different conclusions, however, under uncertainty for quantity supplied and rice price overseas. The optimum policy with adjustment cost in rice industry is tariffication under slow reduction of tariff rate. In the expectation of DDA negotiations in 2007, the time to change the policy is expected in 2008. We suggest to use agricultural funds for reformation of the agricultural industry, not to use to promote rice production.