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Exchange Rates Movements and Trade Flows : Case Study of Korea
오동현(Dong Hyun Oh) 한양대학교 디지털경제연구소 1996 디지털경제연구 Vol.1 No.-
Traditionally devaluation was considered as improving trade balance by expanding the real quantity of exports and reducing the real quantity of imports when the Marshall-Lerner condition is satisfied. The purpose of this paper are to identify the extent to which own exchange rate movements explain improvement in competitiveness, changing trade balances and to investigate whether exchange rates movements of competing countries(Taiwan and Japan in this study) can affect the terms of trade and trade flows of Korea. A conventional elasticities approach was used. In this study, the empirical results show that (1) the effect of a devaluation on trade balance is very weak in Korea ; (2) Japan's exchange rate affects on total exports of Korea ; and (3) Taiwan's exchange rate affects export prices of Korea.
OECD 회원국의 녹색생산성 비교분석을 통한 녹색정책경로 모색
오동현 ( Dong Hyun Oh ),정기철 ( Gi Cheol Jeong ) 한국생산성학회 2012 生産性論集 Vol.26 No.2
The green policies have actively been paid attention to as the green growth is one of global issues from the economic and environmental perspectives. This paper analyzes the green productivity growth index for the OECD countries over the period 1991-2009 in order to explore the trajectory of the green policy, aiming at effective policy implication. We used the macroeconomic and CO2 emissions indicators for the empirical investigation. We also decomposed the green productivity growth index into efficiency change and technical change indexes. The empirical results tell us that i) in a short term Korea needs to focus on catching up with the Northern European countries, and ii) in a long term she needs to spur the green innovation. We believe that this research is helpful for the policy makers to develope policies about the green growth.
태양열 흡수판용 복층 TiNO<sub>x</sub> 박막의 제조와 특성 분석
오동현,한상욱,김현후,장건익,이용준,Oh, Dong-Hyun,Han, Sang-Uk,Kim, Hyun-Hoo,Jang, Gun-Eik,Lee, Yong-Jun 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.12
TiNOx multi-layer thin films on aluminum substrates were prepared by DC reactive magnetron sputtering method. 4 multi-layers of $TiO_2$/TiNOx(LMVF)/TiNOx(HMVF)/Ti/substrate have been prepared with ratio of Ar and ($N_2+O_2$) gas mixture. $TiO_2$ of top layer is anti-reflection layer on double TiNOx(LMVF)/TiNOx(HMVF) layers and Ti metal of infrared reflection layer. In this study, the crystallinity and surface properties of TiNOx thin films were estimated by X-ray diffraction(XRD) and field emission scanning electron microscopy(FE-SEM), respectively. The grain size of TiNOx thin films shows to increase with increasing sputtering power. The composition of thin films has been investigated using electron probe microanalysis(EPMA). The optical properties with wavelength spectrum were recorded by UV-Vis-NIR spectrophotometry at a range of 200~1,500 nm. The TiNOx multi-layer films show the excellent optical performance beyond 9% of reflectance in those ranges wavelength.
창업 단계의 기업가정신 제고 방안: 효율성 분석 방법론을 중심으로
오동현 ( Dong Hyun Oh ),이윤준 ( Yoon Jun Lee ),이아정 ( Ah Jung Lee ) 한국생산성학회 2015 生産性論集 Vol.29 No.1
The goal of this study is to develop policy suggestions in order to increase the efficiency of entrepreneurship. First, regression analysis is carried out to examine how input variables affect output in each phase of startup development. Then, data envelopment analysis(DEA) estimates efficiency in each development process in 26 countries and identifies where South Korea locates herself in terms of entrepreneurial efficiency. The empirical results in the regression analysis implies the following. First, in terms of entrepreneur, more young people should become self-employed to achieve business opportunities in the market. Second, in terms of regulatory environment, government programmes should be diversified and differentiated in order to meet the various needs of startup companies. Third, in terms of market, startups should be tenacious, equipped with global competencies to survive. Fourth, in terms of financial support, it should be easier for startups to enter into market with accessible unsecured loans. Fifth, in terms of knowledge infrastructure, it is critical to encourage substantial investments on R&D. Sixth, in terms of education/training, vocational and lifelong education/training produces more effective result than the one at universities. Last, in terms of cultural environment, society needs to show more respects to entrepreneurs, and media should pay more attention to their entrepreneurship. DEA addresses benchmark countries for South Korea to improve efficiency in each stage of development phases. While the efficiency of Korean startups is above average in the phase of pre-startup, early-stage startup, and growth, it is far below average in the phase of failure/recovery. Among the entrepreneurship in benchmark countries on the efficiency frontier, it is highly suggested that the one in China should be extensively analysed to carry implications to Korea.
AgAl 전극 고온 소성 조건 가변에 따른 N-형 결정질 실리콘 태양전지의 접촉 특성 분석
오동현,정성윤,전민한,강지윤,심경배,박철민,김현후,이준신,Oh, Dong-Hyun,Chung, Sung-Youn,Jeon, Min-Han,Kang, Ji-Woon,Shim, Gyeong-Bae,Park, Cheol-Min,Kim, Hyun-Hoo,Yi, Jun-Sin 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.8
n-type silicon shows the better tolerance towards metal impurities with a higher minority carrier lifetime compared to p-type silicon substrate. Due to better lifetime stability as compared to p-type during illumination made the photovoltaic community to switch toward n-type wafers for high efficiency silicon solar cells. We fabricated the front electrode of the n-type solar cell with AgAl paste. The electrodes characteristics of the AgAl paste depend on the contact junction depth that is closely related to the firing temperature. Metal contact depth with p+ emitter, with optimized depth is important as it influence the resistance. In this study, we optimize the firing condition for the effective formation of the metal depth by varying the firing condition. The firing was carried out at temperatures below $670^{\circ}C$ with low contact depth and high contact resistance. It was noted that the contact resistance was reduced with the increase of firing temperature. The contact resistance of $5.99m{\Omega}cm^2$ was shown for the optimum firing temperature of $865^{\circ}C$. Over $900^{\circ}C$, contact junction is bonded to the Si through the emitter, resulting the contact resistance to shunt. we obtained photovoltaic parameter such as fill factor of 76.68%, short-circuit current of $40.2mA/cm^2$, open-circuit voltage of 620 mV and convert efficiency of 19.11%.