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TFELD 절연층을 위해 ITO glass위에 증착된 (Ba_(0.5),Sr_(0.5))TiO₃박막의 특성
김정환,배승춘,권성렬,정훈,박진우,김기완 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
We have studied that dielectric and electrical properties of (Ba_(0.5),Sr_(0.5))TiO_(3) thin films deposited on Indium Tin Oxide-coated glass substrate by using rf-magnetron sputtering method in this paper. Substrates were heated at room, 300℃ , 400℃, and 500℃. Working pressure was changed 5mTorr, 10mTorr, 20mTorr, 30mTorr respectively substrates temperature, and Ar:O_(2), ratio was fixed 9:1. SEM analysis was conducted to investigate thickness of BST thin films. Dielectric constant, current-voltage(I-V), and transmittance were measured. We observed difference of that thickness, dielectric constant, current-voltage(I-V), and transmittance due to variable substrates temperature and working pressure. We also obtained best conditions at 400℃, 30mTorr. Dielectric constant was 209.1 at 1kHz, leakage current density was below 7.35X10^(-7)A/cm^(2) at 100V, and transmittance was over 91%.
( Seong Ryul Kwon ),( Won Park ),( Min Jung Song ),( Ko Woon Joo ),( Mie Jin Lim ),( Kyoung Hee Jung ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: The relationship between infiammation and new bone formation is unsolved question in area of spondylitis. We investigated the circulating osteoblast in peripheral blood with novel cell culture technique before and 14 weeks after infi iximab therapy in patients with ankylosing spondylitis to check the relationship between infi ammation and new bone formation. Methods: Male fifteen individuals with ankylosing spondylitis were enrolled. They met the modifi ed New York criteria and the candidates of infi iximab therapy, refractory to non-steroidal anti-infiammatory drugs. Peripheral blood mononuclear cells were collected and cultured in growth medium. Once cell multilayering has been observed (about 7 days), cells were moved to differentiation medium and cultured for 3 weeks. Then, cells were fi xed and stained with alizarin S stain to detect any calcifi ed nodules. The optic density measurement of alizarin S was performed to quantitative analysis. We evaluated 1) the change of numbers of circulating osteoblast precursors, 2) the optic density of alizarin S red staining of circulating osteoblast precursors, 3) osteocalcin, c-terminal telopeptide (CTX-1), receptor activator of NFkB ligand (RANKL) with enzyme linked immunosorbent assay (ELISA) in peripheral blood before and after 14 week infi iximab therapy in patients with ankylosing spondylitis. Results: The number of osteoblast precursor cells (figure-1) and optic density of alizarin S were decreased after infi iximab therapy (p = 0. 018 for optic density of alizarin S). The serum level of osteocalcin was increased after infi iximab therapy (p = 0. 01); but, CTX and RANKL was not changed signifi cantly. Conclusions: The circulating osteoblasts in peripheral blood were decreased signifi - cantly after 14 weeks of infi iximab therapy. This result can support infi ammation and activation of new bone formation occurs simultaneously in patients with ankylosing spondylitis.
S 단백 활성도 감소가 베체트병의 질병 활동도를 반영한다
권성렬 ( Seong Ryul Kwon ),임미진 ( Mie Jin Lim ),박신구 ( Shin Goo Park ),하기철 ( Ki Cheol Ha ),기성호 ( Sung Ho Ki ),박보형 ( Bo Hyoung Park ),문연숙 ( Yeon Sook Moon ),박원 ( Won Park ) 대한류마티스학회 2005 대한류마티스학회지 Vol.12 No.4
Objective: To see whether the active inflammation in Behcet`s disease (BD) can cause thrombotic disorders by decreasing the protein S activity (PSA), we evaluated the relationship between PSA decrease and disease activity of BD. Methods: We included 122 patients with BD whose PSAs were measured between August 1998 and April 2005. In 51 BD patients, the PSA was measured again when there were changes in the number of items of The Behcet`s Disease Current Activity Form (BDCAF). Results: Thrombosis rate was 2.5% (3/122), and the PSA was low in all 3 of the patients. The incidence of low PSA in total 122 BD patients was 27% (33/122). The incidence of low PSA in active BD patients was 33.7% (31/92), and it was significantly more frequent in active BD patients than in inactive patients, 6.7% (2/30) (x2-test, p value=0.0038). The decrease of PSA had good correlation with the number of BDCAF items (r=-0.351, p=0.012). Conclusion: The PSA decrease is related to the disease activity of BD. PSA could be not only the risk factor for thrombotic disorder but also the activity marker for the BD and other inflammatory diseases.
Characterization of polyurethane foam prepared by using starch as polyol
Kwon, Oh-Jin,Yang, Seong-Ryul,Kim, Dae-Hyun,Park, Jong-Shin Wiley Subscription Services, Inc., A Wiley Company 2007 Journal of applied polymer science Vol.103 No.3
<P>Polyurethane foams were prepared using starch as a main component of polyols and their structural, mechanical, and absorbing properties for organic solvents were investigated. Fourier transform infrared spectra showed that urethane linkage was formed by the reactions between &n.bond;NCO of diisocyanates and &n.bond;OH of polyols. When polyurethane foams were prepared at high molar ratio of &n.bond;NCO/&n.bond;OH, the unreacted &n.bond;NCO groups were detected. Also, urea linkage was formed by the reaction between diisocyanate and water, which was used as the foaming agent. The micrographs showed that the polyurethane foams had closed-cell structure, of which the cell size increased with &n.bond;NCO/&n.bond;OH molar ratio. The density of polyurethane foams increased with molecular weight of polyethylene glycol. The compressive moduli of polyurethane foams increased with &n.bond;NCO/&n.bond;OH molar ratio. Polyurethane foams prepared using toluene-2,4-diisocyanate as diisocyanate had the highest modulus, while those prepared using hexamethylene diisocyanate had the lowest modulus. In case of the absorbency for the organic solvents, the polyurethane foams prepared at &n.bond;NCO/&n.bond;OH molar ratio of 0.8 had the maximum absorbency. Among several organic solvents, the absorbency for dimethyl sulfoxide was the highest, while the absorbency for tetrahydrofuran was the lowest. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1544–1553, 2007</P>
권오경,임수길,최병렬,성기석 한국환경농학회 1997 한국환경농학회지 Vol.16 No.4
천연물기원 신농약 개발을 위한 기초 단계로서 국내에 자생하고 있는 31과 59종의 식물체를 대상으로 생물활성을 평가하여 생리활성물질 함유 식물자원을 탐색한 결과는 다음과 같다. 1. 벼멸구 살충성분 함유 식물자원 탐색결과 21과 38종 식물체중 피마자잎의 조추출물은 1%(w/v) 농도수준에서 100%의 살충력을 보였으며, 고삼의 잎, 줄기, 뿌리와 상치, 할미꽃은 각각 82%, 84%, 80%, 75%의 벼멸구 살충효과를 나타냈다. 2. 벼흰잎마름병에 대해 활성을 나타낸 식물은 사철쑥을 비롯한 8종이었으나, 저지원효과는 0∼2㎜로서 저조하였다. 3. 식물 조추출 혼합물의 벼멸구에 대한 살충 공력효과는 고삼뿌리+때죽잎 혼합조합이 134∼142%, 고삼뿌리+먹구슬나무종자 조합이 128∼155%이었다. 4. 적송 등 21종 식물체를 물과 M��로 추출하여 그 조추출물의 생리활성을 조사한 결과 무와 피의 종자에 대해 발아억제 효과를 보인 것은 적송, 상수리 2종이었다. 5. 적송의 MeOH 조추출 농도별 allelopathy 평가결과 2%(w/v) 농도수준에서 무종자에 대한 발아억제 효과는 100%이었으며, 5%(w/v) 농도에서는 무와 피종자 모두 완전억제 반응을 나타냈다. For the selection of plants contained pesticidal active conpounds, 31 families 59 species of native plants were collected and biological activites of their crude extracts against brown planthopper (Nilaparvata lugens), Xanthomonas oryzae pv. oryzae and allelopathy were examined. Among the screened plants, the crude extracts from the leaves of Ricinus communis and Sophora angustifolia showed 100% and 82% of mortality on brown planthopper at the concentration of 1% (w/v) respectively. Mixed crude extracts of Sophora angustifolia root and Meha azedarach seed exhibited 128∼155% of synergistic effects on the mortality of brown planthopper. In case of fungicidal activity, the crude extracts from the leaves of 8 plants including Chrysanthemum indicum were inhibitory of the growth of Xanthomonas oryzae pv. oryzae at 1%(w/v) soluction. Seed germination of radish (Raphanus sativas) and barnyardgrass (Echinochloa crus-galli) was inhibited by 0.5%(w/v) leaf extracts of Pinus densiflora and Quercus acutissima. MeOH extracts of Pinus denislora leaves gave 100% inhibition in seed germintion of radish at 2%(w/v) soluction and showed a complete inhibition in seedling growth of barnyardgrass as well as radish at 5% solution.