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Vibrio vulnificus균의 Capsule이 병인론에서의 역할
조관식,이신제,고광균 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2
To elucidate the pathogenesis of hematogenous Vibrio vulnificus infection in vibrio septicemia. Vibrio vulnificus was inoculated to cultured endothelial cells. The ultrastructural change in infected cell were observed by electron microscope. Vibrio vulnificus was used two distinct colony type designated as opaque and translucent. Opaque strains are encapsulated, in contrast translucent strains are unencapsulated. The cytopathic effect of the endothelial cell was appeared at the initial stage of Vibrio vulnificus infection and also when inoculated with cultured supernatant, the cytopathic effect was appeared. We conclude that endothelial cell invasion, and injury are potential mechanisms in the pathogenesis of vibrio septicemia.
울금(Curcuma Longa)으로부터 유효성분 분리와 생산국 및 지역별 유효성분 함량 분석에 따른 커쿠민 동정연구
류가연,노광현,류성열,양효식 한국공업화학회 2005 응용화학 Vol.9 No.1
Chinese herbal medicine Curcuma longa is used in food, Chinese herbal medicine and parts of medicine. In particular, Curcuma longais also used as spice due to its unique fragrance, and curcumin substance, a Curcuma longa substance, is known as an outstanding anti-cancer substance. Thus, it is a Chinese herbal medicine that is attracting the attention of numerous researchers. This research conducted an experiment, separating substances that are found in Curcuma longa. In particular, curcumin(CUR), activation material,and other effective substances were subjected to extraction, separation and purification to verify effective substance index by production site by leveraging a method of analysis that uses HPLC. Moreover, this research separated herb medicine substances such as imported material and Curcuma aromatica to conduct comparative analysis of substances. Thus, this research was attempted to develop base data for the medicine development as well as identification of substances that may be used as additive for beverages, and to differentiate Korean made from imports. Towards this end, each chemical combination of separated substances are subjected to physical property, IR, ¹H-NMR, GC Mass, HPLC spectrum analysis for publication.
MUSIC 알고리즘을 이용한 적응 빔 성형에 관한 연구
문성익,이광식,양두영 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1
In order to estimate DOA(Direction Of Arrival) of signal, the adaptive beam forming algorithm based on MUSIC(Multiple Signal Classification) is studied and analyzed. The eigenvalues for the signal component and the noise component are obtained from correlation matrix of the received signal by array antenna. The eigenvalues classified the signal components into the noise components decide the power spectrum of the received signal. From the results, DOA is estimated by the signal and noise spatial vector, and the steering beam pattern is found by weight vectors calculated from the spatial vector, effectively.
Kim, Kwang Joo,Eom, Jung-Hye,Kim, Young-Wook,Seo, Won-Seon,Lee, Mi-Jai,Hwang, Sung Sic Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.6
<P><B>Abstract</B></P> <P>A polycrystalline SiC ceramic prepared by pressureless sintering of α-SiC powders with 3vol% Al<SUB>2</SUB>O<SUB>3</SUB>-AlN-Y<SUB>2</SUB>O<SUB>3</SUB> additives in an argon atmosphere exhibited a high electrical resistivity of ~10<SUP>13</SUP> Ωcm at room temperature. X-ray diffraction revealed that the SiC ceramics consisted mainly of 6H- and 4H-SiC polytypes. Scanning electron microscopy and high resolution transmission electron microscopy investigations showed that the SiC specimen contained micron-sized grains surrounded by an amorphous Al-Y-Si-O-C-N film with a thickness of ~4.85nm. The thick boundary film between the grains contributed to the high resistivity of the SiC ceramic.</P>
Original Article : Measurement of Strabismic Angle Using the Distance Krimsky Test
( Kwang Sic Joo ),( Hyun Koo ),( Nam Ju Moon ) 대한안과학회 2013 Korean Journal of Ophthalmology Vol.27 No.4
Purpose: To evaluate the correlation of the distance Krimsky test and the alternate prism cover test (APCT) for the distance deviation in patients with horizontal strabismus. Methods: Forty patients with horizontal strabismus (20 esotropia and 20 exotropia) were included in this study. Patients with a variable angle of deviation, vertical angle over 5 prism diopters, impaired binocular vision, or poor cooperation were excluded. We instructed the patient to look a target 6 meters away, and applied a prism over the patient``s dominant eye while flashing a light source 33 centimeters from the middle of both eyebrows. When the corneal light reflexes were located on the center of each cornea, we measured the angle of deviation. We defined this method as ``distance Krimsky test,`` and the angle measured by this method was compared with the conventional Krimsky test and APCT at distance. We analyzed the accuracy and intra- and inter-observer reliability. Results: The angle of strabismus measured by the distance Krimsky test showed a significant agreement and correlation with the deviation angle measured by the APCT. We elicited the correlation gradient between the angle measured by the distance Krimsky test and the APCT. In addition, the distance Krimsky test showed significant intra- and inter-observer reliabilities. Conclusions: The distance Krimsky test is expected to be more useful than the Krimsky test in measuring the distance angle of deviation for patients with strabismus in whom it is difficult to measure the angle of deviation using the APCT. The distance Krimsky test can be an accurate and useful test through the improvement of proficiency of examiners and the establishment of individualized normative data.
주철 알루미늄 합금의 Hot Dip Aluminizing시 흑연 및 금속간화합물 층의 형성 거동
한광식 ( Kwang Sic Han ),강용주 ( Yong Joo Kang ),강문석 ( Mun Seok Kang ),강성민 ( Sung Min Kang ),김진수 ( Jin Su Kim ),손광석 ( Kwang Suk Son ),김동규 ( Dong Gyu Kim ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.2
Hot dip aluminizing (HDA) is widely used in industry for improving corrosion resistance of material. The formation of intermetallic compound layers during the contact between dissimilar materials at high temperature is common phenomenon. Generally, intermetallic compound layers of Fe2Al5 and FeAl3 are formed at the Al alloy and Fe substrate interface. In case of cast iron, high contact angle of graphite existed in the matrix inhibits the formation of intermetallic compound layer, which carry with it the disadvantage of a reduced reaction area and mechanical properties. In present work, the process for the removal of graphite existed on the surface of specimen has been investigated. And also HDA was proceeded at 800oC for 3 minutes in aluminum alloy melt. The efficiency of graphite removal was increased with the reduction of particle size in sanding process. Graphite appears to be present both in the region of melting followed by re-solidification and in the intermetallic compound layer, which could be attributed to the fact that the surface of cast iron is melted down by the formation of low melting point phase with the diffusion of Al and Si to the cast iron. Intermetallic compound layer consisted of Fe(Al,Si)3 and Fe2Al5Si, the layer formed at cast iron side contained lower amount of Si.