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열전달 특성을 고려한 복합 초전도재료의 임계전류밀도 해석
고태국,최용환,이상진 연세대학교 대학원 1992 延世論叢 Vol.28 No.1
In the design of superconducting devices, stability in the present is the one of the most important factors. Stability is a mesure of the ability of a conductor or device to spontaneously return to the superconducting state after the passage of a disturbance that had either triggered or driven an excursion into the normal state ; this treatise made a study of one of the stability theories, flux jump stability. As a part of flux jump stabilization this treatise derived the stability parameter making use of superconducting theory and thermodynamics, and created the critical current density Jc on the formula. Consequently, the stability of superconductor was improved with considering the heat transfer effect. And this treatise reached the conclusion that the critical current density is uplifted in inverse proportion to the width of superconductor and the volumetric proportion of superconductor. For instance, Jc= 1.01×108 when a=0.018m, λ=0.3 but Jc=5.50×104 when a=0.019m, λ= 1
적외선 영상 획득을 위한 직육면체형 지상 표적에 대한 열해석 연구
이상엽,최준혁,박원희,김태국 중앙대학교 기술과학연구소 2003 기술과학연구소 논문집 Vol.33 No.-
육면체형 지상 표적의 적외선 영상을 획득하기 위하여 표적을 등성질의 사각형 격자로 세분하여 열해석을 수행하였다. 열해석을 위하여 전도, 대류 및 복사를 고려하였으며, 태양복사에 의한 입사량은 LOWTRAN 7을 이용하여 산출하였다. 다양한 조건에서 열해석을 수행하여서 물리적 온도를 산출하였으며, 이는 열상장비에서의 적외선 화상을 시뮬레이션을 하는데 기본 도구로 사용될 수 있다. The thermal modeling of a 3D ground target by considering the solar radiation through various atmospheric conditions and the eonvection by the atmospheric air is studied. Since the heat is dissipated by the conduction within the target, the target is subdivided into small rectangular elements to determine the local temperature distribution on the target which is the most important information in generating the infrared images from the target. For the thermal modeling, simple experimental models are applied for the conduction within the target and the convection by the atmospheric air and a realistic model called as the LOWTRAN 7 in used to determine the solar incidence on the target after passing through the atmospheric layer. The physical temperature distribution on the target is determined for various atmospheric conditions from the thermal modeling, and these data can be utilized for various purposes such as the infrared image generation of the target considered.
김성수,최현교,박홍채,김태옥,서봉국 한국환경과학회 2000 한국환경과학회지 Vol.9 No.4
To improve CO_2 permselectivity, a modified silica membrane was prepared by chemical vapor deposition with tetraethoxysilane(TEOS)-ethanol-water, and TEOS-ethanol-water-HCI solution at 300-600℃. The silica was effectively deposited in the mesopores of a γ-alumina film coated on a porous α-alumina tube by evacuating the reactants through the porous wall. In this membrane, CO_2 interacts, to some extent, with the pore wall, and CO_2/N_2 selectivity then exceeds the value of the Knudsen diffusion mechanism, while the membrane derived from TEOS alone has no CO_2 selectivity. The silica membrane prepared from TEOS-ethanol-water-HC1 solution showed that CO_2 permeance was 2.5×10 exp (-7)㏖/s^-1. m^-2. Pa^-1 at 30℃ and CO_2/N_2 selectivity was approximately 3. The CO_2 permeance and selectivity was improved by enlarging the surface diffusion with modification of chemical affinity of the silica pores.
이용훈,최석천,지명국,이상철,정효민,정한식 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-
The purpose of this research is to obtain the heat transfer characteristics of the absorber type solar collector. This new system moving by time and degree. The second system had the solar tracking system. The x-y axis were designed at intervals of 0.33˚/min and 0.16˚/min respectively. In this system the absorber specification was 1OOLX80Φ1.4t. This experiment was conducted from July to August. 2002. The temperature of solar collector was reached about mean temperature 250℃.
인체 혈장에서 염산시프로플록사신(시프로플록사신으로서 250㎎) 정량을 위한 HPLC 분석법의 유효성검토
하용화,조성희,천성국,서성훈,류재환,최영욱,이경태 한국약제학회 2004 Journal of Pharmaceutical Investigation Vol.34 No.4
A simple HPLC method with ultraviolet detection of ciprofloxacin in human plasma was developed and validated. After protein precipitation with trichloroacetic acid, chromatographic separation of ciprofloxacin in plasma was achieved at 50℃ with a C_18 column and methanol-phosphate mixture (pH 2.5), as mobile phase. Quantitative determination was performed by ultraviolet detection at 278 nm. The method was specific and validated with a limit of quantification of 100 ng/ml. The infra- and inter-day coefficients of variation were between 1.67% and 10.55% and accuracy between 92.01% and 106.09%. The method has been successfully applied in a bioavailability study of 250 ㎎ ciprofloxacin hydrochloride tablet.
펄스폭제어방식을 이용한 Switching Regulator에 관한 연구
박규태,윤형로,최승국 연세대학교 산업기술연구소 1981 논문집 Vol.13 No.2
본 논문에서는 Switching Regulator 내의 PWM 시스템에서의 위상지연과 스위칭소자의 지연에 의한 위상지연을 고찰하였고 출력필터의 연속전류모드와 불연속전류모드의 궤환에 의한 시스템의 특성을 분석하였다. 또한 Surge에 의한 Normal mode 잡음과 Ground 잡음전류에 의한 Common mode spike 잡음의 원인을 분석하고 그 대책을 강구하였으며 실제 스위칭 레귤레이터의 제작에 필요한 회로구성과 소자의 선정요건을 고찰하여 효율 82.6%, spike 잡음 10mvp-p 이내의 안정되고 특성이 우수한 레귤레이터를 설계하였다. The phase shift in PWM System due to the time delay in the switching elements has been studied. Employing the normal model, various performance characteristics of the converter for both continuous current operation and discontinuous current operation are compared. The normal mode noise generated by surge and common mode noise generated by ground noise current have been studied. To decrease the noise, several methods are introduced. Hardware circuits are built and in experimental measurements, it shows a high efficiency of 82.6% and low spike noise of 10mv p-p max.
이승재,김국진,최면송,강상희 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-
In the point of view a protective relay, the selectivity and sensitivity is very important in its performance. The correct setting of the relay parameter is required. The verification of accurate setting for the protective relay is very difficult before a actual fault occur. In this paper, we proposed the diagnosis expert system as a method to verify the correctness of the relay setting. The developed system proved effectiveness through the tests on the real systems.
사람 末梢血液 淋巴球의 分離와 그 LDH Isoenzyme에 關하여
鄭弘根,朴壽根,崔榮,金英國,金昇元 中央醫學社 1972 中央醫學 Vol.23 No.5
The present paper describes the result obtained with lymphocytes separated from the peri - pheral humam blood by the method of Kim et. al(1970) and the LDH isoenzyme pattern of lymphocytes after sonicating the cells, which showed binomial distribution of LDH1 through LDH5, showing 11, 26, 44, 14, and 5% of activities respectively, with 56.0% of the H-subunit.