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고속액체크로마토그래피에 의한 알로에 제제 중의 알로에신의 정량
김경호,김현주,박정일,신영근,Kim, Kyeong-Ho,Kim, Hyun-Ju,Park, Jeong-Hill,Shin, Young-Geun 대한약학회 1996 약학회지 Vol.40 No.2
The contents of aloesin in aloe preparations were determined by HPLC. Aloesin was extracted 3 times with ethanol for 30 minutes. The ethanol extract was concentrated and suspend ed in saturated NaCl aqueous solution and successively partitioned with dichloromethane, n-butanol. Prepared samples were analyzed by HPLC on a reverse column(Inertsil ODS-2). In assay, internal standard was a puerarin and regression of calibration curve was 0.998. Recoveries of aloesin added to aloe preparation were 98~123(%).
김경호,이동근,Kim, Kyeong Ho,Lee, Dong Guen 대한토목학회 1987 대한토목학회논문집 Vol.7 No.2
고층 건물의 정확한 거동을 구하기 위한 구조 해석은 컴퓨터 적용의 중요한 분야로 취급되어 왔다. 본 논문에서는 건축구조물에 대한 3차원적인 해석방법을 연구하였다. 이 해석 방법은 건물을 각각의 독립된 프레임의 조합체로 보고 해석하므로 매우 효율적이며, 건물의 3차원적인 거동에 관한 고려는 건물이나 하중이 대칭이 아닐 때는 특히 중요하다. 그리고 matrix condensation 기법을 이용함으로써 컴퓨터의 용량과 해석 시간이 상당히 절약되므로 매우 경제적이다. 본 논문의 건물 구조해석 컴퓨터 프로그램 PFS의 정확성과 효율성을 증명하기 위해 여러가지 예제들에 대해서 SAPIV 에 의한 해석 결과와 비교하였다. 그러므로, 본 논문에서 제안한 해석방법은 고층 건물의 구조 설계에서 매우 효율적이라 할 수 있다. The prediction of the exact behavior of multistory building is one of the most complicated problem encountered in structural engineering practice. An efficient computer method for the three dimensional analysis of building structures is presented in this paper. A multistory building is idealized as an assemblage of a series of rectangular plane frames interconnected by rigid floor diaphragms. The matrix condensation technique is employed for the reduction of degrees of freedom, which results in a significant saving in computational efforts and the required memory size. Kinematical approach was used to assemble condensed stiffness matrices of plane frames into a three dimensional stick model stiffness matrix. The static analysis follows the modified tridiagonal approach. Since this procedure utilizes the condensed stiffness matrix of the structure, the dynamic equations of motion for the story displacement are developed by assigning proper mass for each story. Analysis results of several example structures are compared to those obtained by using the well-known SAP IV for verification of the accuracy and efficiency of the computer program PFS which was developed utilizing the method proposed in this study. The analysis method proposed in this study can be used as an efficient and economical means for the analysis of multistory buildings.
김경호,이민구,이창규,위명용,김흥회,Kim, Kyeong-Ho,Lee, Min-Ku,Rhee, Chang-Kyu,Wey, Myeong-Yong,Kim, Whung-Whoe 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.12
In this research, fretting tests were conducted in air to investigate the wear characteristics of fuel cladding materials with the fretting parameters such as normal load, slip amplitude, frequency and the number of cycles. A high frequency fretting wear tester was designed for this experiment by KAERI. After the experiments, the wear volume and the shape of wear contour were measured by the surface roughness tester. Tribologically transformed structures(TTS) were analysed by means of optical and scanning electron microscopes to identify the main wear mechanisms. The results of this study showed that the wear volume were increased with increasing slip amplitude, and the shape of wear contour was transformed V-type to W-type. Also, it was found that the critical slip amplitude was 168${\mu}{\textrm}{m}$. These phenomena mean that wear mechanism transformed partial slip to gross slip to accelerate wear volume. The wear depth increased with an increase of friction coefficient due to increase of normal load and frequency. The fretting wear mechanisms were believed that, after adhesion and surface plastic deformation occurred by relative sliding motion on the contact between two specimens, TTS creation was induced by surface strain hardening and wear debris were detached from the contact surface which were produced by the micro crack propagation and creation.
브레이징 온도와 균질화 처리 시간이 니켈기 초내열합금의 접합특성에 미치는 영향
김경호(Kyeong Ho Kim),김광호(Gwang Ho Kim),이민구(Min Ku Lee),이호진(Ho Jin Lee),김흥회(Whung WWhoe Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An intermediate heat exchanger(IHX) is the key component in which the heat from the primary circuit helium is transferred to the secondary circuit helium(about 950℃ at 1000psi) in a very high temperature reactor(VHTR). Joining of IHX candidate materials such as Haynes 230, Hastelloy-X and Inconel 617 by a vacuum brazing have been investigated at 1100, 1150, and 1190℃ for holding time 5 minutes using a nickel-based insert metal MBF 15. The effects of homogenizing times and brazing temperatures on the joint and the resulting joint tensile strength were investigated. Excellent joints were obtained that joint tensile strength when processed at 1190℃ for 5 minutes. The elemental distribution in the joint was analysed on the joint cross-section by EPMA. Major elements detected included Ni, Fe, Cr, Si and B. Results from EPMA reveal the agglomerates along the centerline of the joint were in Cr, Ni and Si. These results suggest possible formation of intermetallic compounds such as Ni and Cr silicides and possibly borides.