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Ryu, Seung-Yeob,Ko, Sung-Ho Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.6
The volume of fluid (VOF) model of FLUENT and the lattice Boltzmann method (LBM) are used to simulate two-phase flows. Both methods are validated for static and dynamic bubble test cases and then compared to experimental results. The VOF method does not reduce the spurious currents of the static droplet test and does not satisfy the Laplace law for small droplets at the acceptable level, as compared with the LBM. For single bubble flows, simulations are executed for various Eotvos numbers, Morton numbers and Reynolds numbers, and the results of both methods agree well with the experiments in the case of low Eotvos numbers. For high Eotvos numbers, the VOF results deviated from the experiments. For multiple bubbles, the bubble flow characteristics are related by the wake of the leading bubble. The coaxial and oblique coalescence of the bubbles are simulated successfully and the subsequent results are presented. In conclusion, the LBM performs better than the VOF method.
Ryu, Jae Hyeon,Baek, Geun-Woo,Kim, Seung Yeob,Kwon, Hyuck-In,Jin, Sung Hun Institute of Physics 2018 Semiconductor science and technology Vol.33 No.7
<P>In this letter, spray-coated single walled carbon nanotubes (SWNTs) as one of alternative electrodes in SnO thin-film transistors are demonstrated for emerging electronic applications. Herein, the device architecture of SnO TFTs with a polymer etch stop layer (SU-8) enables the selective etching of SWNTs in a desired region without the detrimental effects of SnO channel layers. Moreover, SnO TFTs with SWNT electrodes as substitutes successfully demonstrate decent width normalized electrical contact properties (∼1.49 kΩ cm), field effect mobility (∼0.69 cm<SUP>2</SUP> V<SUP>−1 </SUP>s<SUP>−1</SUP>), sub-threshold slope (∼0.4 V dec<SUP>−1</SUP>), and current on–off ratio (<I>I</I> <SUB>on</SUB>/<I>I</I> <SUB>off</SUB>?∼?3.5?×?10<SUP>3</SUP>). Systematic temperature dependency measurements elucidate that SnO channel transports with an activation energy within several tens of meV, together with decent contact resistance as compared to that of conventional Ni electrodes.</P>
장승엽(Seung Yeob Jang),류경수(Kyung Soo Ryu) 한국생약학회 1985 생약학회지 Vol.16 No.1
백굴채는 담낭염 및 담석증등에 사용되며 독일약전에 수재된 생약의 하나이다. 이는 Chelidonium majus L.의 지상부를 개화기에 채취하여 건조한 것으로서 우리나라 전국 각지에 분포되어 자원이 풍부한 생약임에도 불구하고 이로부터 추출한 엑기스 제제가 수입되고 있다. 연자는 국내 자원 이용의 측면에서 국산 백굴채의 기원식물인 Chelidonium majus L.를 계절별로 채취한 다음 흡광도 측정법을 사용하여 총 알칼로이드 함량을 구하였고 또 재료의 MeOH로 추출한 액중의 그 대표적인 성분인 Chelidonine을 β-Bondapak NH₂ column, 60% MeOH:PIC-B6 (100:2)의 mobile phase, 254nm UV detector의 HPLC조건으로 측정하여 비교하였다. 국산 백굴채중의 총알칼로이드 함량은 0.48∼1.11%이고 Chelidonine 자체의 함량은 0.34∼0.95%이었으며 계절별로는 7월말까지 증가하고 이후는 감소하였다.