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Quantitative Determination of ABS from Mixture of Anionic and Nonionic Detergents by NMR
최광훈,권순자,Koang-Hoon Choe,Sun-Ja Kwon Korean Chemical Society 1983 대한화학회지 Vol.27 No.6
음이온세제와 비이온세제의 혼합물에서 alkylbenzene sulfonate 계통의 음이온 세기가 NMR법에 의해서 정량되었다. 음이온세제와 비이온세제의 혼합물에 대한 NMR 스펙트럼에서, 벤젠 그룹은 6.5∼8ppm에서 중첩된 피크를 보여주나 sampling 후의 벤젠 그룹은 7∼8ppm에서 두개의 doublet을 보여준다. 검량선은 음이온세제의 벤젠그룹과 초산의 메칠그룹의 상대적인 면적비에 의해서 작성되었다. (초산은 내부표준물로 사용되었다.) Amounts of alkylbenzene sulfonate (ABS) in the mixtures of anionic and nonionic detergents were determined by nuclear magnetic resonance (NMR) method. In the NMR spectrum of anionic and nonionic detergents, benzene group showed peaks overlapping at 6.5∼8ppm, but after sampling, benzene group showed two doublet at 7∼8ppm. Calibration curve was obtained by relative ratio of area for benzene group in anionic detergent to that for methyl group in acetic acid(acetic acid was used as the internal standard).
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Houttuynia cordata 및 Saururus chinensis의 정유성분에 관한 연구
최광훈,권순자 慶熙大學校 1989 論文集 Vol.18 No.-
Chemical components in the essential oil of Saururus chinensis and Houttuynia cordata growing in Korea were separated and identified by gas chromatograph and GC-mass spectrometry, and constituents of Saururus chinensis were very different from those of Houttuynia cordata, that is, the former was mainly composed of sesquiterpenoids(C_15H_24, M. W: 204) and safrole, while the latter monoterpenoids and lipids.
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학생의 영어 자기 효능감이 인지적 학습 정도와 학습 성과에 미치는 영향: 교사 리더십의 조절 효과와 학습 동기부여의 매개 영향
최광훈 한국교육방법학회 2023 교육방법연구 Vol.35 No.1
This research examined the roles of transformational leadership in the perspective of English education methodology. This study investigated the impact of a transformational leadership on the reinforcement of the student’s English self-efficacy, and the moderating effects of a transformational leadership on the relationships between the student’s English self-efficacy and the student’s intrinsic motivation to learn English. This study also examined the relationships among the student’s English self-efficacy, the student’s intrinsic motivation, and the student’s English education performance. The empirical questionnaires data were collected form first and second grade high school students in Daegu city. Finally, 192 questionnaires data were collected. The empirical results showed that consideration and influence, and intellectual stimulation, which were the dimensions of a transformational leadership, have a positive impact on the reinforcement of the student’s English self-efficacy. The positive effects of the English self-efficacy on the student’s intrinsic motivation were also confirmed. The moderating effects of a transformational leadership on the relationships between the student’s English self-efficacy and the intrinsic motivation to learn English were generally demonstrated. It was found that the student’s intrinsic motivation positively affects the student’s English education performance. The positive relationships among English self-efficacy, intrinsic motivation, and English education performance were empirically confirmed. Therefore, to improve the student’s English learning performance, various tools, which reinforce the student’s English self-efficacy, and realize the strong desire to learn English, were required in school.
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