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Prestressed 콘크리트 거더의 현장 가설 시에 안정 검토
황용태,김유식 한밭대학교 건설안전기술연구소 2004 건설안전기술논문집 Vol.4 No.-
In this study 1 have developed a computer program to analyze stability of structures by analyzing stabilities of the prestressed concrete girders in the building stages that may lower their efficiency from their production to the completion on the construction sites. This program can calculate the tolerance limit through analyzing the stability in the stage of building prestressed concrete girders It was calculate to the distance between permissible building points, the horizontally tolerable angle of inclination, the vertically tolerable angle of inclination and the tolerable safety rate on the horizontal part of the girders by the computer program.
朴龍泰,黃正儀,鄭倧在,呂壽東,洪錫 慶北大學校 文理科大學 1979 文理學叢 Vol.6 No.-
Several model compouds for photocyclization of alkaloids were synthesized. When benzanilide was irradiated with UV lamp in quartz photocell, surprisingly 2-aminobenzophenlone and 4-aminobenzohpenone were produced as a Photo Fires reaction, However, when the benzanilide was irradiated in Pyrex photocell, the expected photoclic-compound, phenanthridone was appeared. Orthosubsitituted benzanilides in Pyrex photocell also gave 8-subsituted-9-oxy-phenanthridines. Thus, the dihydrophenanthridone was assumes as intermediate of the photocyclization of benzanilides as model for alkaloid photocyclization reaction.
황정의,정종재,박용태,지종기,박의환 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-
The temperature and pressure dependences of the dissociation constants of mono-, di- and tri-chloroacetic acids were studied by the conductimetry in the range of 20-35℃ and 1-2500 bars. The thermodynamic parameters ΔH, ΔS, and ΔV were evaluated from the dissociation constants. The dissociation constants were increased as the temperature and pressure was increased respectively. The pressure effects can be explained by the fact that the increase of the charges of reaction species enhances the solvation of ions and reduces the reaction volume. As the more chlorines were substituted to acetic acid, the effect of pressure on the dissociation constants was decreased because of the enhanced solvation effect. From the thermodynamic data it can be estimated that there are two types of dissociation reactions. They are an enthalpy-dominated reaction and an entropy-dominated one.
A Singlet Oxygen Trapping Agent
Park, Y-T,Hwang, J-U 慶北大學校 物理化學硏究所 1985 硏究論文集 Vol.6 No.-
빌리루빈과 옥소디피로메텐들의 광산소화 분해 반응속도를 측정하던중 옥소디피로메텐들이 디페닐이소벤조퓨란보다 좋은 단일상태 산소의 트랩제라는 사실을 알게 되었다. 빌리루빈과 그 모델물질인 옥소디피로메텐들은 아주 빠른 속도로 단일상태 산소와 반응하거나 궨칭하였다. 한 새로운 옥소디피로메텐이 간단한 방법으로 합성되었다. Measuring the reaction rate of bilirubin and oxodipyrromethenes with signlet oxygen, we have found oxodipyrromethenes to be better singlet oxygen trapping agents than diphenyl isobenzofuran, the best such agent known so far. The photooxygenation rates of bilirubin and the model compounds, oxodipyrromethenes approached the diffusion control threshold. A new oxodipyrromethene is synthesized.
黃正儀,鄭倧在,朴龍泰,池鍾基,박은숙 慶北大學校 物理化學硏究所 1984 硏究論文集 Vol.5 No.-
Anilinium ion, o-toluidinium ion, phenol 및 o-chorophenol의 해리상수를 10∼40℃ 온도범위와 1∼2000 bar의 압력범위에서 분광광도법으로 측정하였다. phenols에서는 일반적인 약산에서처럼 온도와 압력이 증가할수록 해리상수가 증가하였으나 anilinium ions의 해리상수는 온도가 증가할수록 증가하였고, 압력이 증가할수록 감소하였다. 해리상수의 압력의 효과는 해리반응시의 하전의 증감으로 설명된다. 즉 phenols와 같이 하전이 증가하는 산은 압력이 증가할수록 해리상수가 증가하나 anilinium ions와 같이 하전의 증감이 없으면 해리상수는 감소한다. 이들 해리상수값에서 열역학적 파라미터, ΔH˚, ΔG˚, ΔS˚, ΔV˚ 및 β를 계산하고 해리반응의 성질을 고찰하였다. The dissociation constants of anilinium ion, o-toluidinium ion, phenol and o-chlorophenol were measured spectroscopically in aqueous solution over the temperature range of 10∼40℃ and at the pressures up to 2,000 bars. The effects of temperature and pressure on the dissociation of the phenols are the same as those of the ordinary weak acids. Meanwhile the dissociation constants of anilinium ions are increased with temperature raising and decreased with pressure elevation. The effects of pressure on the constants can be explained by taking account of change of charge during dissociation reaction; there are increase in charge in the dissociation of phenols but anilinium ions are not. Several thermodynamic properties, ΔH˚, ΔG˚, ΔS˚, ΔV˚ and β are calculated from those constants, and the dissociation reactions are discussed by item.
황정의,정종재,박용태,지종기,박의환 慶北大學校 1982 論文集 Vol.33 No.-
The temperature and pressure dependences of the dissociation constants of mono-, di- and tri-chloroacetic acids were studied by the conductimetry in the range of 20-35℃ and 1-2500 bars. The thermodynamic parameters ΔH, ΔS, and ΔV were evaluated from the dissociation constants. The dissociation constants were increased as the temperature and pressure was increased respectively. The pressure effects can be explained by the fact that the increase of the charges of reaction species enhances the solvation of ions and reduces the reaction volume. As the more chlorines were substituted to acetic acid, the effect of pressure on the dissociation constants was decreased because of the enhanced solvation effect. From the thermodynamic data it can be estimated that there are two types of dissociation reactions. They are an enthalpy-dominated reaction and an entropy-dominated one.
A Singlet Oxygen Trapping Agent
박용태,황정의,Y-T. Park,J-U. Hwang Korean Chemical Society 1979 대한화학회지 Vol.23 No.6
빌리루빈과 옥소디피로메텐들의 광산소화 분해 반응속도를 측정하던중 옥소디피로메텐들이 디페닐이소벤조퓨란보다 좋은 단일상태 산소의 트랩제라는 사실을 알게 되었다. 빌리루빈과 그 모델물질인 옥소디피로메텐들은 아주 빠른 속도로 단일상태 산소와 반응하거나 괜칭하였다. 한 새로운 옥소디피로메텐이 간단한 방법으로 합성되었다. Measuring the reaction rate of bilirubin and oxodipyrromethenes with singlet oxygen, we have found oxodipyrromethenes to be better singlet oxygen trapping agents than diphenyl-isobenzofuran, the best such agent known so far. The photooxygenation rates of bilirubin and the model compounds, oxodipyrromethenes approached the diffusion control threshold. A new oxodipyrromethene is synthesized.