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페라이트 본드 영구자석의 극이방 자화특성에 따른 BLDC 모터의 특성해석
백수현(Soo Hyun BAEK) 대한전기학회 2010 전기학회논문지 Vol.59 No.12
The magnetization directions of a polar magnetized ferrite?bonded magnet are analyzed by finite element method (FEM). The influence of the width of SmCo magnets for magnetic field generation is investigated. The surface flux densities of the polar anisotropic magnets are analyzed and compared according to the pole number and thickness of the magnets. And the electromotive force (EMF) values of brushless DC motors with the magnets are investigated. The validity of the analysis method is verified by comparing the analyzed results with measured ones.
닭의장풀의 Iridoid, Triterpenoid, 및 Steroid 성분에 관한 연구(II)
백수현(Soo Hyun Baek),서원준(Won Jun Seo),배기환(Kih Wan Bae),진갑덕(Kap Duck Jin) 대한약학회 1990 약학회지 Vol.34 No.1
Three non-alkaloidal constituents, (-)-loliolide as an iridoid, friedelin as a triterpenoid, and beta-sitosterol as a steroid, were isolated by fractional extraction and silica gel column chromatography from the herb of Commelina communis L. (Commelinaceae). The structures of the native components were elucidated on the basis of physical and spectral (UV, IR, PMR, CMR, and mass spectra) data.
백수현(Soo Hyun Baek),서원준(Won Jun Seo),배기환(Kih Wan Bae),진갑덕(Kap Duck Jin) 대한약학회 1990 약학회지 Vol.34 No.1
The alkaloidal constituents of Commelina communis(Commelinaceae) were investigated. From the ether soluble alkaloidal fraction, three beta-carboline type alkaloids were isolated by chromatographic purification process. Their chemical structures were identified as 1-carbomethoxy-beta-carboline, norharman and harman from the physicochemical data, which were newly isolated from this plant.