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신훈규,권영수 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1
The role of ESR spectroscopy in the characterization of functional LB films is discussed. Optical absorption were performed on LB films of binary mixtures of three kinds of merocyanine dyes where DS and 6Me-DS form J-like aggregates but not DO in single component films. The observed optical absorption spectra of mixed films were markedly dependent on the combination of dyes. We found the formation of J-aggregtes in a mixed merocyanine dyes containing a non J-aggregate forming dye DO, in a single component case. In structural studies, ESR is of particular important in the analysis of molecular orientation of LB films. Development of new functional LB films may provide more cases where ESR spectroscopy will clarify the nature of such films.
초박막의 분자구 해석을 위한 Nanometer-Scale Dimension의 전기·광학 이미지 관찰
신훈규,권영수 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1
The scanning Maxwell-stress microscopy (SMM) is a dynamic noncontact elecric force microscopy that allows simultaneous access to the electrical properties of molecular system with the toporathy. The scanning near-field optical/atomic force microscopy (SNOPAM) is a new tool for surface imaging which was introduced as one application of the atomic force microscope (AFM). Here we report our recent results of its application to nanoscopic study of domain structures adn electrical functional in ultra-thin films prepared by the Langmuir-Blodgett technique, sputtering and spin coating by SMM. Furthermore, we have illustrated the SMOAM image in obtaining the merocyanine dye thin films as well as the optical transmission image.
신창훈,김규석 동국대학교 산업기술연구원 1999 산업기술논문집 Vol.14 No.-
본 논문은 구조적인 손상을 입은 R.C보의 강판보강에 대한 휨내력 평가를 목적으로 한다. 6개의 시험체를 제작하여 사전가력에 의해 손상도 A(기준시험체 항복하중의 75% 가력), 손상도 B(100% 가력), 손상도 C(105% 가력)로 분류하고 강판보강하여 휨내력을 평가한다. 이를 기준시험체와 비교 분석하여 강판보강에 의한 내력복원과 연성능력을 정량적으로 규명한다. The Rehabilitation and repair of structurally deteriorated reinforced concrete structure become necessary as time goes by. This study purpose to provide the data about flexural retrofitted effect of RC beam strengthened with Steel Plate. In order to provide the data, 6 specimens were manufactured and divided with standard specimen and damaged degree A, B, C. Standard specimen was tested to failure under four-point loading test. Then damaged degree A, B, C specimens were loaded to 75%, 100%, 105% of standard specimen's yield loading point respectively. Generally experimental results showed that flexural capacity of structurally damaged beam strengthened with Steel Plate incremented highly. In the case that each strengthened group of damaged degree A, B, C is compared with standard specimen, flexural capacity of each specimen was incremented and ductility was almost same.
고립성 폐결절의 조직학적 진단에 있어서 경기관지폐생검의 진단적 가치
김치훈,김정주,왕준호,연규민,김형수,리원연,용석중,신계철 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-
Transbronchial lung biopsy(TBLB) is a relatively simple and convenient diagnostic tool in solitary pulmonary nodule(SPN) on chest radiograph, which is cannot be diagnosed through routine tests. To investigate the diagnostic value and diagnostic rate of TBLB according to the variable factor, we analyzed 69 patients with radiologically SPN lesion on chest radiograph which was confirmed histologically. A histologic diagnosis of TBLB was made in 47 of 69 patients(68.1%), in which 26 of 37(70.3%) with malignancy and 21 of 32(65.6%) with benign lesion. There were no significant differences in diagnostic yield according to age, sex and location of the lesion. The diagnostic rate tended to increase with the more than 5 pieces to acquired by TBLB. When the size of SPN was less than 3 ㎝, it cannot be diagnosed. In conclusion, TBLB is a diagnostic procedure with good yield and safety, but percutaneous needle aspiration, transbronchial needle aspiration, and bronchial washing fluid cytology may be a complementary procedure to overcome the limitation of TBLB and get higher diagnostic yield for SPN.
승온시 Si₂H가스 주입을 이용한 저온 Si 에피택시에 관한 연구
金亨駿,申東勳,崔圭鎭,金東玄 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.2
In this study, we studied on the low temperature Si epitaxy growth for Si epitaxial growth temperature below 650。C. Usually, the Si epitaxy films by chemical vapor deposition are crystallized to polycrystalline films due to a formation of SiO₂layer at the epitaxial Si/Si substrates interfaces. Formation of SiO₂layer on Si surface can be effectively prevented by flowing the Si₂H?? gas during the heating-up procedure for Si deposition. In this way, Si epitaxial layer onto (100) Si substrates was grown epitaxial layer during the post-deposition heat treatments. The suppression of surface BIO₂can be explained in terms of adsorption of SiH?? adspecies, instead of oxygen from residual gases in the reactors, to Si surfaces after desorption of hydrogen from H-passivated Si surfaces. Employing Si₂H?? flowing and epitaxial growth, high-quality epitaxial Si layer was the low temperature below 650。C without conventional high temperature cleaning procedures. And the crystallinity of epitaxial layer measured as deposition conditions using ultraviolet reflectance. AS this results, we could be aquaired process temperature region for high-quality low temperature Si epitaxial growth.
Spectral Change and Surface Images of the Azobenzene Functionalized Dendrimer in LB Monolayers
Shin, Hoon-Kyu,Kwon, Young-Soo The Korean Institute of Electrical Engineers 2001 KIEE International Transactions on Electrophysics Vol.11C No.4
The functionalized dendrimer containing 48 azobenzene was synthesized. Many isolated featureless domains were explicitly observed even at the air/water interface. Also, these monolayers were representatively observed, showing the change of surface pressure with irradiation time and wavelength. In AFM images, larger domains irregularly shaped structures on the top, while smaller ones were free from such defects. In the optical absorption spectra of the monolayer films by UV irradiation and heat treatment, only the photoiosmerization of the G4-48 Azo monolayers was observed, revealing a decrease of absorbance peaks without any change of the spectral shape. This suggests that the functional group and the symmetric chain affect optical behavior and morphological change.
Shin, Sun Mi,Cho, Kyu Suk,Choi, Min Sik,Lee, Sung Hoon,Han, Seol-Heui,Kang, Young-Sun,Kim, Hee Jin,Cheong, Jae Hoon,Shin, Chan Young,Ko, Kwang Ho Kluwer Academic/Plenum Publishers 2010 Neurochem Res Vol.35 No.7
<P>In response to brain injury, microglia migrate and accumulate in the affected sites, which is an important step in the regulation of inflammation and neuronal degeneration/regeneration. In this study, we investigated the effect of urokinase-type plasminogen activator (uPA) on the BV-2 microglial cell migration. At resting state, BV-2 microglial cells secreted uPA and the release of uPA was increased by ATP, a chemoattractant released from injured neuron. The migration of BV-2 cell was significantly induced by uPA and inhibited by uPA inhibitors. In this condition, uPA increased the activity of matrix metalloproteinase (MMP-9) and the inhibition of MMP activity with pharmacological inhibitors against either uPA (amiloride) or MMP (phenanthrolene and SB-3CT) effectively prevented BV2 cell migration. Interestingly, the level of MMP-9 protein and mRNA in the cell were not changed by uPA. These results suggest that the increase of MMP-9 activity by uPA is regulated at the post-translational level, possibly via increased activation of the enzyme. Unlike the uPA inhibitor, plasmin inhibitor PAI-1 only partially inhibited uPA-induced cell migration and MMP-9 activation. The incubation of recombinant MMP-9 with uPA resulted in the activation of MMP-9. These results suggest that uPA plays a critical role in BV-2 microglial cell migration by activating pro-MMP-9, in part by its direct action on MMP-9 and also in part by the activation of plasminogen/plasmin cascade.</P>