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洪性鳳(Sung-Bong Hong) 한국인구학회 1991 한국인구학 Vol.14 No.1
Improvements in various health indices have been ushered in, along with soaring economic growth in the last few decades in Korea. Life span of Koreans at present stands at somewhere around age of seventies. It seems of worth to elucidate some facets of health profile of historic Koreans during Yi dynasty encompassing about five hundreds years between the 14th and 19th century. Datas on health of historic Koreans are meager with exception for sovereigns for whom royal archives have been preserved intact through centuries. Though the health enviroments for monarchs are, no doubt, incomparable to that of the grassroot levels during the same period, health profile of monarchs would facilitate to assess health indices for historic Koreans during Yi dynasty. Arithmetic average of life span of 25 consecutive Kings(omitted the last two Kings under Japanese control) is 44.6 years of age, 81 year old for King Yongjo and 16 year old for King Danjong, representing two extremes. The principal causes of death are septicemia, subsequent to infections of soft tissues and other organs(8 in number, one-thirds of all). Secondly, both epidemic disease and vascular accidents caused deaths of three Kings each. Two kings succumbed to diabets and one suicide. The causes for the remainder, eight kings are hardly ciarified. The monarchs who contributed in establishment of new Yi dynasty with highspirited and disciplined survied beyond their fifties and sixties. In contrast, those who reigned during mid - era of the dynasty at its culmination succumbed to death in their young adulthood, most likely due to their indulgence in court life.
고출력 레이저 시스템을 위한 대구경 Faraday Rotator 제작
洪成基(Sung-Ki Hong),徐永錫(Young-Seok Seo),高光薰(Kwang-Hoon Ko),金永原(Young-Won Kim),韋相烽(Sang-Bong Wee),林昶煥(Changhwan Lim) 대한전기학회 2008 전기학회논문지 Vol.57 No.6
We report on the design and experimental results of a large diameter faraday rotator for the high-power laser system (KLF: Kaeri laser facility) that was completed in late 2007s at Korea Atomic Energy Research Institute. The design involves modelling the magnetic field of cylindrical coil with large diameter (110 ㎜). Magnetic field generation coil is designed by 6 layers using a rectangular wire with cross-sectional area 3×5 [㎟]. We obtain an isolation ratio for optical feedback of 35 ㏈ at 1064 nm and magnetic field strengths ~25 kG. We expect that the design can be widely used optical isolators in high-power laser system.