http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
슈에이 엔도 건축에 나타나는 프랙탈 기하학의 형태생성 알고리즘에 관한 연구
김광배,이성구 대한건축학회 2004 대한건축학회논문집 Vol.20 No.6
Even until recently, the only tool for designers to express their architectural forms has been Euclid geometry. However, new attempts have been made by contemporary designers to interpret the phenomenological complexity of the modern world and environment, and they realized that Euclid geometry is limited in representing full extent of their interpretation, and the need of a nonlinear approach as the presentation method to represent the intricacy is inevitable. The fractal theory, as an expressed form of chaos, now influences arts, music, economics, and other areas, let alone the science and mathematics. And this theory is being applied by some contemporary architects to generate the architectural forms. Fractal geometry is composed of self-similarity, randomness, irregularity, and unpredictability, and the character of its form composition can be described as scaling and skew, overlapping, repetition and gradation, and so on. They are diversely applied to modern architectural works and concepts. Especially, they appear in the Shuhei Endo`s works. The purpose of this study is to understand the form-generating algorithm of the fractal geometry as a rule of nature and to find the value and diverse application methods in Shuhei Endo`s works.
불활성 가스의 O<sub>2</sub>와 CO 불순물 제거를 위한 Ni 촉매의 물성 평가
김광배,진새라,김은석,임예솔,이현준,김성훈,노윤영,송오성,Kim, Kwangbae,Jin, Saera,Kim, Eunseok,Lim, Yesol,Lee, Hyunjun,Kim, Seonghoon,Noh, Yunyoung,Song, Ohsung 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.4
반도체 산업용 9N 이상의 초고순도 N<sub>2</sub>, Ar 등 불활성 가스 제조를 위해 가스 정제공정에 사용되고 있는 Ni 촉매의 물성 평가 및 촉매적 특성을 확인하였다. 조성이 다른 원기둥 형태의 C1, 츄러스 형태의 C2의 두 가지 Ni 촉매에 대해 비교 평가를 진행하였다. Ni 촉매의 형상과 미세구조를 분석하기 위해 광학현미경과 FE-SEM을 이용하였으며, 조성 확인 및 물성을 분석하기 위해 EDS, XRD, 그리고 micro-Raman 분석을 이용하였다. 또한 Ni 촉매의 비표면적 및 촉매적 특성을 확인하기 위해 BET, Pulse Titration 분석을 진행하였다. 조성 분석결과, C1의 경우, 상대적으로 graphite가 불순물로 다량 포함되어 있는 것을 확인하였으며, C2는 C1에 비해 Ni의 함량이 높은 것을 확인하였다. 비표면적 분석 결과, C2의 비표면적이 C1보다 약 1.69배 정도 큰 것을 확인할 수 있었다. 촉매적 특성분석 결과, 상온에서 O<sub>2</sub>와 CO 불순물 제거 정도가 C2가 우수함을 확인하였다. 따라서 반도체 산업용 초고순도 불활성 기체 제조를 위한 Ni 촉매로는 불순물이 적고, 비표면적이 크며, 상온에서 O<sub>2</sub>와 CO 제거 성능이 우수한 C2가 적합함을 확인하였다. This study examined the catalytic property of Ni-catalyst used in the gas purifying process to manufacture inert gases of N2 and Ar with high-purity over 9N for semiconductor industrial applications. Two types of Ni-catalysts with a cylindrical shape (C1) and churros shape structure (C2) were compared for the assessment. Optical microscopy and FESEM were used to analyze the shape and microstructure of the Ni-catalyst. EDS, XRD, and micro-Raman characterization were performed to examine the composition and properties. BET and Pulse Titration analyses were conducted to check the surface area and catalytic property of the Ni-catalyst. From the composition analysis results, C1 contained a relatively large amount of graphite as an impurity, and C2 contained higher Ni contents than C1. From specific surface area analysis, the specific surface area of C2 was approximately 1.69 times larger than that of C1. From catalytic property analysis, outstanding performance in O<sub>2</sub> and CO impurity removal was observed at room temperature. Therefore, C2, having low-impurity and large specific surface area, is a suitable catalyst for the high-purity inert gas process in the semiconductor industry because of its outstanding performance in O<sub>2</sub> and CO impurity removal at room temperature.
Gravity Variation Estimation of the 2011 Tohoku Earthquake
김광배,이창경 한국측량학회 2015 한국측량학회지 Vol.33 No.6
Gravity variations due to the 2011 Tohoku (M9.0) earthquake, which occurred at the plate boundaries near the northeastern coast of Japan, were estimated through the GRACE spherical harmonic (Stokes) coefficients derived from the CSR. About -5 μGal gravity variation by the GRACE data was found in the back-arc basin area with respect to a reference gravity model. The mean gravity variations in the back-arc basin area and the Japan Trench area were -4.4 and -3.2 μGal in order. The small negative gravity variations around the Japan Trench area can be interpreted by both crustal dilatation and the seafloor topography change in comparison with the large negative gravity variations in the back-arc basin area by co-seismic crustal dilatation of the landward plate. From the results of the gravity variations, vertical displacements generated from relatively short wavelength caused by the earthquake were estimated by use of multi-beam bathymetric measurements obtained from JAMSTEC. The maximum seafloor topography changes of about ±50 m were found at west side of the Japan Trench axis by the earthquake. The seafloor topography change by the megathrust earthquake can be considered as the results of the landslide of the seafloor throughout the landward side.
Bathymetry Change Investigation of the 2011 Tohoku Earthquake`
김광배,이창경 한국측량학회 2015 한국측량학회지 Vol.33 No.3
Bathymetry change due to the 2011 Tohoku (M9.0) earthquake was investigated through satellite altimetryderivedfree-air gravity anomalies (SAFAGA) and shipborne measurements. The earthquake occurred at theplate boundaries near the northeastern coast of Japan, where the oceanic plate subducts beneath the continentalplate along deep-sea trench. Data analyzed in this study include SAFAGA from Scripps Institution ofOceanography (SIO), shipborne bathymetry (SB) from the U.S. National Geophysical Data Center (NGDC) andthe Japan Agency for Marine-Earth-Science And Technology (JAMSTEC). To estimate the bathymetry change,a reference bathymetry before the earthquake was predicted by gravity-geologic method (GGM) and Smith &Sandwell’s (SAS) method. In comparison with the bathymetry models before the earthquake, GGM bathymetrymodel generated by a tuning density contrast of 17.04 g/cm3 by downward continuation method was selectedbecause it shows better bathymetry in the short wavelength below about 6 km. From the results, remarkablebathymetry change of about ±50 m was found on the west side of the Japan Trench caused by the earthquake.