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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.
Determination of Gravity Anomaly Using Satellite Altimeter Data in the Great Lakes
김광배,이석배 대한토목학회 2002 KSCE JOURNAL OF CIVIL ENGINEERING Vol.6 No.3
In this paper, the determination of gravity anomalies in the Great Lakes using satellite altimeter data of GEOSAT Geodetic Mission (GM) and TOPEX/Poseidon is discussed. The seasonal change of lake level was observed from TOPEX/Poseidon satellite altimeter data. This analysis of lake level change was made to determine the mean lake surface profiles along the TOPEX/Poseidon repeat tracks. The least squares collocation was used to predict gravity anomalies. The gravity anomalies are determined by using mean lake surface profiles derived from TOPEX altimeter data and along-track slopes and azimuth derived from lake surface heights measured by the GEOSAT altimeter. To remove influences of the cycle-to-cycle time variation of lake level, along-track slopes of altimeter height are used. These results are compared to the exisiting surface gravit data measured in the Great Lakes. The gravity anomaly in the Lake Huron derived from the altimeter data using the least squares collocation shows slightly better comparison with the surface gravity anomaly than that implied by the EGM-96 gravity model.
Ti-6Al-4V 합금의 초소성 성형 온도 감소를 위한 열화학적 방법의 적용
김광배,정성환 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.8
To determine the optimum thermochemical processing (TCP) methods, A Ti-6Al-4V alloy was hydrogenated with 60% hydrogen and 40% argon mixture gas at 760℃ and 830℃ for various times. After holding the hydrogenated Ti specimens at 760℃ and 830℃ for 30 minutes, they were pre-treated with various cooling rate for providing the nucleation sites for hydrides. And then they were aged at 500℃ for 2-10 hours for the formation of hydrides. Finally, Ti specimens were dehydrogenated at 700℃ and 830℃ for 2-30 hours to degas and refine microstructures via recrystallization. Specimens were tested with Instron machine to determine the mechanical properties. Also, the superplastic deformation tests were carried out at 840℃, 880℃ and 927℃ to measure the superplsticity of the specimens. As a result of TCP, Ti specimens exhibited fine equiaxed grains of 2㎛. Grain refinement with TCP induced the increase of mechanical properties and superplastic characteristics.
김광배,지기용,한동균,천세원,최종영,백영진 한국막학회 2017 한국막학회 총회 및 학술발표회 Vol.2017 No.11
기존의 육상 및 근해에서의 석유 생산량은 점차 감소하는 추세로 심해에서 석유 및 가스 생산량이 증가하고 있는 추세이다. 심해용 해상 생산 설비가 필수적이나 육상에 비해 설치비용이 2배이상 들어가기 때문에 설치면적당 가스처리량이 높은 기체분리막이 주목 받고 있는 상황이다. 현재 외산 분리막이 중용되고 있으며, 이를 대체할 국산화 제품 개발이 필요한 실정이다. 따라서 본 연구에서는 폴리이미드계 고분자인 폴리에테르이미드 고분자를 사용하여 기체분리 막을 제조 하였으며, 투과도와 선택도를 높이기 위해 코팅제로 polyether black amide (PEBAX)를 사용하여 이산화탄소/메탄의 분리 정제 효율을 증가시키기 위한 연구를 진행하였다.
질소 5N 가스 분위기에서 다공질 ZrFe 합금의 산화 안정화
김광배,진새라,임예솔,이현준,김성훈,노윤영,송오성 대한금속·재료학회 2021 대한금속·재료학회지 Vol.59 No.10
A porous ZrFe alloy specimen was prepared as a 6 × 3 mm (diameter × thickness) disk. The reaction of the ZrFe alloy was confirmed while the whole system was maintained at a target temperature, which was increased from 150 oC to 950 oC in a 99.999% low purity nitrogen atmosphere, consisting of 10 ppm of impurity gas. Surface color, pore size, stabilized layer, and phase change were confirmed with optical microscopy, scanning electron microscopy-energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Micro-Raman, according to temperature. The surface color of the ZrFe alloy changed from metallic silver to dark gray as the temperature increased. In the EDS and XPS results, nitrogen component was not observed, and oxygen content increased on each surface at the elevated temperatures. In this way, the ZrFe alloy was stabilized in a low purity nitrogen atmosphere, preventing rapid nitride reactions.
페로브스카이트 태양전지의 Au 열증착 조건에 따른 Hole Transport/Perovskite 층의 물성변화
김광배,박태열,송오성 대한금속·재료학회 2018 대한금속·재료학회지 Vol.56 No.4
Changes in the properties of the hole transport layer (HTL) and the perovskite layer in a perovskite solar sell (PSC) were observed under various Au thermal evaporation conditions. We employed a conventional thermal evaporator with a distance of 30 cm between the source and substrate in a vacuum of 6 × 10-6 torr. We prepared 70 nm-thick Au layers on PSCs by varying the evaporation condition: 60 W-90 min, 70 W-60 min, 80 W-25 min, 90 W-10 min, and 100 W-7 min. Subsequently, the photovoltaic properties of the PSC were measured for each deposition condition. Also, the microstructure of the HTL/perovskite was observed using a scanning electron microscope (SEM) and electron probe xray micro-analyzer (EPMA) after the Au layer was selectively removed. The most outstanding energy conversion efficiency (ECE) was measured for the 80 W-25 min condition. The ECE was extremely low at relatively low power-long time (60 W-90 min, 70 W-60 min) conditions, due to contamination of the HTL and the perovskite layers during the Au evaporation. The contamination was confirmed from the SEM and EPMA investigations. Moreover, even with high powered-short time (90 W-10 min, 100 W-7 min) conditions, the HTL underlayer of the electrode was damaged due to the high deposition energy.