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김철수,양영근 제주대학교 기초과학연구소 2002 基礎科學硏究 Vol.15 No.1
We investigated an irrational constant e and compared its computational methods using spreadsheet. Such methods are based on classical definition, infinite series, continued fraction, infinite product, exponential function and accelerated classical method. This kind of work is focused on experimental mathematics using computers in math class. This approach will be helpful for mathematics teachers to teach constant e in their classroom.
CRT용 電子銃의 制御電極 口徑 및 電極間隔 이 빔 스포트 크기에 미치는 影響
李茂永,楊英根,金南虎 嶺南大學校 工業技術硏究所 1991 연구보고 Vol.19 No.1
In the electron gun of a CRT, the physical construction of beam forming region exhibts vital effect on the size of beam spot. In this paper, the characteristics of beam size, which is a function of aperture diameter of grid G₁and gap distance G₂ and G₃, are presented based on a series of experiments conducted by the author on the 12 inch monchrom CRTs. It has been confirmed that the smaller aperture of G₁ with the lower beam current generally assures the sharper beam spot and that the optimal combination for obtaining the smallest beam spot size on the screen is 0.35mm aperture on G₁ and 0.30mm gap between G₂ and G₃, if all other conditions remain unchanged.