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이성호,김웅태,채광표,정덕조 建國大學校基礎科學硏究所 1988 理學論集 Vol.13 No.-
Fe₂SiO₄에 관한 X-선 회절실험과 Mossbauer 분광실험을 하였다. X-선 회절실험 결과 본 시료는 olivine group에 속하는 fayalite로서 orthorhombic 구조(??)임을 알 수 있었다. Mossbauer 분광실험은 60K-834K의 온도구간에서 행하여 졌으며, Mossbaure 스펙트럼을 분석한 결과 철은 high spin 2+ 상태임을 알 수 있었고, X-선 회절실험 결과와는 다르게 철이 산소 이온들과 함께 일그러진 octahedron을 형성하고 있음을 알 수 있었다. The Fe₂SiO₄ has been studied by means of X-ray diffractometry and Mossbauer spectroscopy. The analysis of X-ray diffraction pattern shows that Fe₂SiO₄is fayalite of orthorhombic structure(??). The Mossbauer spectra which have been taken between 60K and 834K show that the valence state of iron is ferrous and high spin state and that the iron ions occupy sites of distorted octahedron whereas the X-ray analysis shows it is at a site of regular one.
이호재,조병서,허웅,김현중 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
In this study, we report the characteristics of three Kinds of Radar Exploration Systems, which are used in geological cavity detection, for effective use. The systems are RAMAC, PEMSS and KAIST CW. We repeated measurements each system for same geological model. The AMAC System has a unique capability in finding fracture zones from the reflected waves, and represents the cavity as a hyperbola because the cavity responds as a point source. In the PEMSS systems the relative velocity and attenuation of the electromagnetic wave which varies by geological medium represents geological structures. The main merit of the PEMSS system is cavity localization. The location of the cavity is determined the depths of cavity signals in each offset data. The KAIST CW system also detects a cavity from the attenuation pattern of continuous waves. This uses the phenomenon of 180'phase change of the wave when it propagates the cavity, producing the high attenuation at that point. Our study shows that the RAMAC is suitable in cavity scanning, the PEMSS is adaptive in precise geology exploration, and KAIST CW is best in cavity detection.
윤웅기 ; 이성호 ; 조백희 김천대학교 2002 김천대학교 논문집 Vol.23 No.-
Now, Resident in apartment is over 50% in our country.
윤웅기 ; 조백희 ; 이성호 김천대학교 2000 김천대학교 논문집 Vol.21 No.-
The dynamic fatigue-life equation is applied to the uniaxial tensile test. On this study, we show that the fatigue limit values can be extracted from the tensile testing data. Consequently, those experi-ments can be correlated and the fatigue limit can be found by the tensile test. The theory is verified by comparing the theoretical fatigue limit from tensile test to experimental fatigue limit from fatigue test. The results can be used to find the reliable fatigue limit by tensile test.
Cho, Chul-Ho,Cho, Woong,Ahn, Yoomin,Hwang, Seung-Yong IOP 2007 JOURNAL OF MICROMECHANICS AND MICROENGINEERING - Vol.17 No.9
<P>This paper reports on the development of a low-cost microreactor (10 ?l) biochip for DNA polymerase chain reaction (PCR). The microbiochip (20 mm ? 28 mm) is a hybrid type that is composed of a polydimethylsiloxane (PDMS) layer with a serpentine microchannel (360 ?m ? 100 ?m) chamber and glass substrate integrated with a microheater and thermal microsensor. Because of the hydrophobic chip surface, bubbles are usually created during sample loading in the PMDS-based microchip. These bubbles disrupt the stable biochemical reaction. An improved microreactor chamber was designed using microfluidic simulation. The reactor has a rounded-corner serpentine channel architecture, which enables stable injection into the hydrophobic surface using only a micropipette. The reactor temperature needed for the PCR reaction is controlled within ?0.5 ?C by the LabVIEW software proportional-integrative-derivative (PID) controller. PCR analyses of the sex-determining Y chromosome (SRY) gene and mouse GAPDH gene were successfully performed in less than 54 min by the fabricated microreactor chip.</P>
Cho, Ho-Song,Lee, Min-Ho,Lee, Jae Woong,No, Kyong-Ok,Park, Sang-Ki,Lee, Heon-Sik,Kang, Sangjin,Cho, Wan-Goo,Park, Hye Ji,Oh, Ki Wan,Hong, Jin Tae Blackwell Publishing Ltd 2007 Photodermatology, photoimmunology & photomedicine Vol.23 No.5
<P>Background</P><P>Naturally occurring antioxidants were used to regulate the skin damage caused by ultraviolet (UV) radiation because several antioxidants have demonstrated that they can inhibit wrinkle formation through prevention of matrix metalloproteinases (MMPs) and/or increase of collagen synthesis.</P><P>Objective</P><P>We examined the effect of oral administration of the antioxidant mixture of vitamin C, vitamin E, pycnogenol, and evening primrose oil on UVB-induced wrinkle formation. In addition, we investigated the possible molecular mechanism of photoprotection against UVB through inhibition of collagen-degrading MMP activity or through enhancement of procollagen synthesis in mouse dorsal skin.</P><P>Methods</P><P>Female SKH-1 hairless mice were orally administrated the antioxidant mixture (test group) or vehicle (control group) for 10 weeks with UVB irradiation three times a week. The intensity of irradiation was gradually increased from 30 to 180 mJ/cm<SUP>2</SUP>. Microtopographic and histological assessment of the dorsal skins was carried out at the end of 10 weeks to evaluate wrinkle formation. Western blot analysis and EMSA were also carried out to investigate the changes in the balance of collagen synthesis and collagen degradation.</P><P>Results</P><P>Our antioxidant mixture significantly reduced UVB-induced wrinkle formation, accompanied by significant reduction of epidermal thickness, and UVB-induced hyperplasia, acanthosis, and hyperkeratosis. This antioxidant mixture significantly prevented the UVB-induced expressions of MMPs, mitogen-activated protein (MAP) kinase, and activation of activator protein (AP)-1 transcriptional factor in addition to enhanced type I procollagen and transforming growth factor-β2 (TGF-β2) expression.</P><P>Conclusion</P><P>Oral administration of the antioxidant mixture significantly inhibited wrinkle formation caused by chronic UVB irradiation through significant inhibition of UVB-induced MMP activity accompanied by enhancement of collagen synthesis.</P>