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Lee, Geun-Hee,Lee, Zin-Hyoung The Korea Association of Crystal Growth 2002 韓國結晶成長學會誌 Vol.12 No.3
Si-wafers for solar cells were cast in a size of $50{\times}46{\times}0.5{\textrm}{mm}^3$ by vacuum casting method. The graphite mold coated by BN powder, which was to prevent the reaction of carbon with the molten silicon, was used. Without coating, the wetting and reaction of Si melt to graphite mold was very severe. In the case of BN coating, SiC was formed in the shape of tiny islands at the surface of Si wafer by the reaction between Si-melt and carbon of the graphite mold on the high temperature. The grain size was about 1 mm. The efficiency of Si solar cell was lower than that of Si solar cell fabricated on commercial single and poly crystalline Si wafer. The reason of low efficiency was discussed.
Antidiabetic Coumarin and Cyclitol Compounds from Peucedanum japonicum
Lee, Sung-Ok,Choi, Sang-Zin,Lee, Jong-Hwa,Chung, Sung-Hyun,Park, Sang-Hyun,Kang, Hee-Chol,Yang, Eun-Young,Cho, Hi-Jae,Lee , Kang-Ro The Pharmaceutical Society of Korea 2004 Archives of Pharmacal Research Vol.27 No.12
The antidiabetic activity-guided fractionation and isolation of the 80% EtOH extracts from Peucedani Radix (Peucedanum japonicum, Umbelliferae) led to the isolation and characterization of a coumarin and a cyclitol as active principles, that is, peucedanol 7-O-${\beta}$ -D-glucopyranoside (1) and myo-inositol (2). Their structures were identified by spectroscopic methods. Compound 1 showed 39% inhibition of postprandial hyperglycemia at 5.8 mg/kg dose, and compound 2 also significantly inhibited postprandial hyperglycemia by 34% (P<0.05).
Cluster-Based Spin Images for Characterizing Diffuse Objects in 3D Range Data
( Hee Zin Lee ),( Sang Yoon Oh ) 한국센서학회 2014 센서학회지 Vol.23 No.6
Detecting and segmenting diffuse targets in laser ranging data is a critical problem for tactical reconnaissance. In this study, we propose a new method that facilitates the characterization of diffuse irregularly shaped objects using “spin images,” i.e., local 2D histograms of laser returns oriented in 3D space, and a clustering process. The proposed “cluster-based spin imaging” method resolves the problem of using standard spin images for diffuse targets and it eliminates much of the computational complexity that characterizes the production of conventional spin images. The direct processing of pre-segmented laser points, including internal points that penetrate through a diffuse object’s topmost surfaces, avoids some of the requirements of the approach used at present for spin image generation, while it also greatly reduces the high computational time overheads incurred by searches to find correlated images. We employed 3D airborne range data over forested terrain to demonstrate the effectiveness of this method in discriminating the different geometric structures of individual tree clusters. Our experiments showed that cluster-based spin images have the potential to separate classes in terms of different ages and portions of tree crowns.
Behavior of Radioactive Elements during Thermal Treatment of Nuclear Graphite Waste
YANG, Hee-Chul,EUN, Hee-Chul,LEE, Dong-Gyu,OH, Won-Zin,LEE, Kune-Woo Atomic Energy Society of Japan 2005 Journal of nuclear science and technology Vol.42 No.10
<P>Nuclear graphite waste retains various radioactive elements. This study investigated the behavior of the radioactive elements during a thermal treatment of the nuclear graphite waste, based on the thermodynamic equilibrium. Two typical thermal conditions were simulated: an excess air incineration and a hydrothermal oxidation. Tritium, <SUP>14</SUP>C and <SUP>36</SUP>Cl are expected to be present in the gas phase throughout the whole waste thermal systems. <SUP>133</SUP>Ba, <SUP>90</SUP>Sr, <SUP>22</SUP>Na, and <SUP>137</SUP>Cs were analyzed to be semi-volatile elements. Their behavior will be dependent upon the gaseous atmosphere as well as the operating temperature. Uranium species are expected to convert into a gas-phase UO<SUB>3</SUB> at temperatures above 1,000°C under excess air incineration atmospheres. Other radioactive elements such as <SUP>59</SUP>Ni, <SUP>60</SUP>Co, <SUP>141</SUP>Ce, <SUP>152</SUP>Eu and <SUP>241</SUP>Am are non-volatile at temperatures up to 1,200°C, regardless of the gaseous atmosphere being simulated.</P>
Cytotoxic Terpene Hydroperoxides from the Aerial Parts of Aster spathulifolius
Lee, Sung-Ok,Choi, Sang-Zin,Choi, Sang-Un,Kim, Gun-Hee,Kim, Young-Choong,Lee, Kang-Ro The Pharmaceutical Society of Korea 2006 Archives of Pharmacal Research Vol.29 No.10
Three new sesquiterpene hydroperoxides, 1-[3-(2-hydroperoxy-3-methylbut-3-en)-4-hydroxyphenyl]ethanone (2), $7{\beta}-hydroperoxy-eudesma-11-en-4-ol$ (3), and $7{\alpha}-hydroperoxymanool$ (4), together with three known compounds, germacrone (1), ent-germacra-4(15),5,10(14)-trien-$1{\alpha}$-ol (5) and teucdiol A (6) were isolated from the aerial parts of Aster spathulifolius (Compositae). Their structures were characterized using chemical and spectroscopic methods. The isolated compounds were tested for their cytotoxicity against five human tumor cell lines in vitro using a SRB method. The two new compounds, 3 and 4, showed moderate cytotoxicity against human cancer cells with $ED_{50}$ values ranging from 0.24 to $13.27\;{\mu}g/mL$.
이진형,이근희 한국주조공학회 2000 한국주조공학회지 Vol.20 No.3
A vacuum casting was proposed as a new fabrication method of Si wafer for solar cell substrate. It was tried to fabricate a Si plate with good properties and to reduce the production cost by direct vacuum casting. By 5-10㎝Hg of pressure difference Si plate with 50×46×1.5㎣ was fabricated. For the preventing of the reaction between graphite mold and Si melt, BN powder coating or BN insert were used. The Si wafer was poly crystalline with 100㎛∼1㎜ order of grain size. And there were some twins and dislocations in the grains.