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2 단계 양극 산화를 이용한 ZrO<sub>2</sub> 나노 다공성 산화막의 제조와 특성에 관한 연구
서의영,최세경,신익수,강위경,Seo, Eui-Young,Choi, Se-Kyeong,Shin, Ik-Soo,Kang, Wee-Kyung 대한화학회 2013 대한화학회지 Vol.57 No.5
전해연마를 한 지르코늄(Zr)을 가지고 $F^-$ 이온이 함유된 무기 전해질과 유기 전해질에서 2 단계 양극산화를 진행하여 산화 지르코늄($ZrO_2$) 나노 다공성 산화막을 제조하였다. 2 단계 양극산화를 진행하면서 무기 전해질에서보다 유기 전해질에서 만들어진 지르코늄 산화막이 보다 균일한 나노 다공성 산화막을 가지게 되었다. 나노 다공성 산화막의 크기와 구조는 FE-SEM(field emission scanning electron microscopy), XRD(X-ray diffraction), EDS(energy dispersive spectroscopy)를 이용하여 특성을 분석하였고 형광스펙트럼을 측정하여 $ZrO_2$ 나노 다공성 산화막의 형광성을 알아보았다. Zirconium oxide ($ZrO_2$) nano porous membranes were fabricated by electrochemical two-step anodization with an electropolished zirconium substrate in inorganic water-based and organic electrolyte systems containing small amounts of fluoride. Using two-step anodization and organic electrolytes, highly regular and ordered nanotubular $ZrO_2$ oxide layers can be compared with aqueous electrolytes. The morphology and size of the nano porous layers were characterized by FE-SEM (field emission scanning electron microscopy), XRD (X-ray diffraction), and EDS (energy dispersive spectroscopy). Luminescence properties were investigated by photoluminescence measurements.
이수형(Lee Su-Hyung),정영훈(Jung Young-Hoon),이일화(Lee Il Hwa),장기수(Jang Ki Soo),신익수(Shin Ik Soo) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The paper presents the procedures and results of the numerical modelling that was carried out to investigate the stability of reinforced earth wall under dynamic railway load. The two-dimensional explicit dynamic finite element method (ABAQUS) was used to carry out the numerical analyses. To simulate the railway load, the top surface of the backfill soil was excited by the uniform distributed load whose frequency and magnitude was estimated by the measured railway acceleration during train passing. The wall displacements and geogrid axial forces were analyzed to evaluate the stability of reinforced earth wall under the dynamic train load.