• Vacuum Magazine
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• v.3 no.4
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• pp.8-13
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• 2016

The need of space-resolved x-ray photoelectron spectroscopy (XPS) has developed scanning photoelectron microscopy (SPEM). SPEM provides space-resolved XPS data from a spot of a sample as well as images of specific element, chemical state, valency distribution on the surface of a sample. Based on technical advancement of tight x-ray focusing, sample positioning accuracy, and electron analyzer efficiency, SPEM is now capable of providing ~100 nm space resolution for typical XPS functionality, and SPEM has become actively applied for the investigation of chemical state, valency, and electronic structure on the surface of newly discovered materials, such as graphene layers, dichalcogenide 2D-materials, and heterogenous new functional materials.

• Proceedings of the Korean Society for Applied Microbiology Conference
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• 1978.10a
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• pp.210.2-210
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• 1978

전보의 glutathione의 최적 추출조건에 의한 추출액을 이온교환수지(Dowe xl-x2, Dowex 50w-x8)에 통과시켜 NAD와 glutathione을 분리하여 각각 paper chromatography로 확인한 결과 authentic Rf치와 일치하였다. 또 glutathione 함유액 부분을 2가구리 화합물로 처리한 동염처리 정제법을 이용하여 순수 glutathione 함유액을 얻었다. 또 chelate제도 sodium gluconate를 0.02％ 처리할때 glutathione 최종 수율이 66.2％에서 76.8％로 증가하였다. 이 순수용액을 50％ ethanol로 처리하여 crude glutathione 결정을 얻었다.

• Journal of Chest Surgery
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• v.24 no.3
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• pp.292-295
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• 1991

Pulmonary sequestration is a rare congenital malformation of the lung and occasionally accompanied with upper gastrointestinal anomalies. Based on the embryologic development, they are grouped as broncho-pulmonary foregut malformation. We present one the case of the intralobar pulmonary sequestration with gastric duplication. The sequestrated pulmonary tissue was 9x7x8cm in dimension, multiseptated and multiloculated, and supplied by a systemic artery of 7mm diameter from the abdominal aorta. The gastric duplication was 8cm in diameter located at the posterior wall of the stomach without communication with the gastric lumen.

• Journal of the Korean Chemical Society
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• v.22 no.6
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• pp.412-416
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• 1978

Die Trennung von Uranisotopen im System HCl/Dowex 50W-X8, 200∼400 mesh wurde versucht. Mit einer 1m Kationenaustauschersaule und extrem geringen Stromungsgeschwindigkeiten konnte eine Anreicherung von Uran 234 und Uran 235 in der Losung nachgewiesen werden.

• 한국초전도학회:학술대회논문집
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• 2007.07a
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• pp.40-40
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• 2007

• Communications of the Korean Mathematical Society
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• v.18 no.1
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• pp.31-37
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• 2003

In this paper, we calculate the number of points on elliptic curves y$^2$ = x$^3$ + cx over F$_p$ mod 8.

• 한국초전도학회:학술대회논문집
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• v.11
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• pp.20-20
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• 2001

• Proceedings of the PSK Conference
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• 2002.10a
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• pp.342.1-342.1
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• 2002

6.7-Dicholroquinoline-5.8-dione reacted with 2-aminopyridine derivatives, Out of the four possible products which could be achieved in this reaction. condensation and rearrangement product. 4a.10.11-triazabenzo［3.2-a］ fluorine-5.6-dione was obtained as major product. The definite structure was identified with X-ray crystallographic study. (omitted)

• Korean Journal of Food Science and Technology
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• v.28 no.3
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• pp.411-416
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• 1996

Supercritical fluid extraction of ${\beta}$-carotene from carrot was optimized to maximize ${\beta}$-carotene (Y) extraction yield. A central composite design involving extraction pressure ($X_1$ 200-,100 bar), temperature ($X_2,\;35-51^{\circ}C$) and time ($X_1$$ 60-200min) was used. Three independent factors ($X_1,\;X_2,\;X_3$) were chosen to determine their effects on the various responses and the function was expressed in terms of a quadratic polynomial equation,$Y={\beta}_0+{\beta}_1X_1+{\beta}_2X_2+{\beta}_3X_3+{\beta}_11X_12+{\beta}_22X_3^2+{\beta}_-12X_1X_2+{\beta}_12X_1X_2+{\beta}_13X_1X_3+{\beta}_23X_2X_3,$ which measures the linear, quadratic and interaction effects. Extraction yields of ${\beta}$-carotene were affected by pressure, time and temperature in the decreasing order, and linear effect of tenter point (${\beta}_11$) and pressure (${\beta}_1$) were significant at a level of 0.001(${\alpha}$). Based on the analysis of variance, the model fitted for ${\beta}_11$-carotene (Y) was significant at 5% confidence level and the coefficient of determination was 0.938. According to the response surface of ${\beta}$-carotene by cannoical analysis, the stationary point for quantitatively dependent variable (Y) was found to be the maximum point for extraction yield. Response area for ${\beta}$-carotene (Y) in terms of interesting region was estimated over $10,611{\mu}g$ Per 100 g raw carrot under extraction.

• Proceedings of the Korea Crystallographic Association Conference
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• 2002.11a
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• pp.16-16
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• 2002

The presently commercialized lithium-ion batteries use layer structured LiCoO₂ cathodes. Because of the high cost and toxicity of cobalt, an intensive search for new cathode materials has been underway in recent years. Recently, a concept of a one-to-one solid state mixture of LiNO₂ and LiMnO₂, i.e., Li[Ni/sub 0.5/Mn/sub 0.5/]O₂, was adopted by Ohzuku and Makimura to overcome the disadvantage of LiNiO₂ and LiMnO₂. Li[Ni/sub 0.5/Mn/sub 0.5/]O₂ has the -NaFeO₂ structure, which is characteristic of the layered LiCoO₂ and LiNiO₂ structures and shows excellent cycleability with no indication of spinel formation during electrochemical cycling. Layered Li[Ni/sub x/Co/sub 1-2x/Mn/sub x/]O₂ (x = 0.5 and 0.475) materials with high homogeneity and crystallinity were synthesized using a mechanical alloying method. The Li[Ni/sub 0.475/Co/sub 0.05/Mn/sub 0.475/]O₂ electrode delivers a high discharge capacity of 187 mAh/g between 2.8 and 4.6 V at a high current density of 0.3 mA/㎠(30 mA/g) with excellent cycleability. The charge/discharge and differential capacity vs. voltage studies of the Li[Ni/sub x/Co/sub 1-2x/Mn/sub x/]O₂ (x = 0.5 and 0.475) materials showed only one redox peak up to 50 cycles, which indicates that structural phase transitions are not occurred during electrochemical cycling. The magnitude of the diffusion coefficients of lithium ions for Li[Ni/sub x/Co/sub 1-2x/Mn/sub x/]O₂(x = 0.5 and 0.475) are around 10/sup -9/ ㎠/s measured by the galvanostatic intermittent titration technique (GITT).