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다이아몬드 분말상에 무전해 Ni-B 도금을 위한 계면활성제의 영향
양창열(Changyol Yang),유시영(Si-Young Yu),문환균(Hwan-Gyun Moon),이정호(Jung-Ho Lee),유봉영(Bongyoung Yoo) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.3
The properties of electroless Ni-B thin film on diamond powder with different parameters (temperature, pH, surfactant etc.) were studied. The surface morphology, structure and composition distribution of the Ni-B film were observed by field effect scanning electron microscope (FE-SEM), energy-dispersive spectrometer (EDS), X-ray diffraction (XRD) and Auger electron spectroscopy (AES). The growth rate of Ni-B film was increased with increase of bath temperature. The B content in Ni-B film was reduced with increase of bath pH. As a result the structure of Ni-B film was changed from amorphous to crystalline structure. The PVP in solution plays multi-functional roles as a dispersant and a stabilizer. The Ni-B film deposited with adding 0.1 mM-PVP was strongly introduced an amorphous structure with higher B content (25 at.%). Also the crystallite size of Ni-B film was reduced from 12.7 nm to 5.4 nm.
다이아몬드 와이어에 의해 절단된 다결정 실리콘 태양전지의 나노텍스쳐링 및 후속 식각 연구
김명현(Myeong-Hyun Kim),송재원(Jae-Won Song),남윤호(Yoon-Ho Nam),김동형(Dong-Hyung Kim),유시영(Si-Young Yu),문환균(Hwan-Gyun Moon),유봉영(Bong-Young Yoo),이정호(Jung-Ho Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
The effects of nanotexturing and post-etching on the reflection and quantum efficiency properties of diamond wire sawn (DWS) multicrystalline silicon (mc-Si) solar cell have been investigated. The chemical solutions, which are acidic etching solution (HF-HNO₃), metal assisted chemical etching (MAC etch) solutions (AgNO₃-HF-DI, HF-H₂O₂-DI) and post-etching solution (diluted KOH at 80℃), were used for micro- and nano-texturing at the surface of diamond wire sawn (DWS) mc-Si wafer. Experiments were performed with various post-etching time conditions in order to determine the optimized etching condition for solar cell. The reflectance of mc-Si wafer texturing with acidic etching solution showed a very high reflectance value of about 30% (w/o anti-reflection coating), which indicates the insufficient light absorption for solar cell. The formation of nano-texture on the surface of mc-Si contributed to the enhancement of light absorption. Also, post-etching time condition of 240 s was found adequate to the nano-texturing of mc-Si due to its high external quantum efficiency of about 30% at short wavelengths and high short circuit current density (Jsc) of 35.4 A/cm².
On the Impacts of Regional Trading Arrangements on FDI
Dong-Geun Han(한동근),Taek-Dong Yeo(여택동),Young-Man Yoon(윤영만),Shiyong Yoo(유시영) 한국무역학회 2004 한국무역학회 세미나 및 토론회 Vol.2004 No.8
The paper examines the impacts of the Northeast Regional Trading Arrangements (RTAs) on inward FDI to Korea. We first study the theoretical background of the relations between RTAs and FDI. Secondly, we analyze the major determinants of the inward FDI to Korea. Finally, a prediction about how the China-Japan-Korea FTA (hereinafter (CJK FTA) will affect the inward FDI to Korea is provided. Prior literature shows that there are three motives for FDI; horizontal integration, vertical integration, and advantage for product varieties. Depending upon which characterthe inward FDI to Korea has, the impact of the China-Japan-Korea FTA on the inward FDI will differ. With the theoretical background, we implemented an empirical study. To characterize the inward FDI to Korea, we constructed a fixed effect regression model where inward FDI was regressed on wage and interest differentials between home and source countries, exchange rates, GDP, trade volume, and the number of labor dispute. Two data sets were used: one consisting of the inward FDI by source country (1980-2003), and the other consisting of the inward FDI by sector and source country (1998-2003). Our empirical results show that the inward FDI to Korea is of both horizontal and vertical character. We argue that the China-Japan-Korea FTA is very likely to encourage FDI inflows to Korea. It is empirically found that the trade volume variable has a positive impact on the inward FDI in all industries, implying that trade and FDI are complements in the Korean industries. Empirical results also show consistent negative signs on real wage differential variable across industries. It is expected that the elasticity of the inward FDI with respect to the real wage differential is going to be much higher once the CJK FTA is formed. It is also expected that the negative effect of labor dispute on the inward FDI will aggravate when the FTA is created. A channel through which FTA may promote the FDI to Korea is growing domestic market size. FTA in general prompts economic growth through enlarged international trade. Therefore, growing consumers' purchasing power under the FTA could attract more FDI into Korea. Whether FTA will discourage or encourage the inward FDI depends on the relative magnitude of positive and negative impacts the FTA will bring. But our temporary verdict is that the CJK FTA is more likely to encourage the inward FDI in general as the Korean labor market is becoming more flexible.