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전일운(Zeon, Il-Woon),손기선(Sohn, Kee-Sun),박희동(Park, Hee-Dong) 대한화학회 2002 대한화학회지 Vol.46 No.1
조합화학 기법을 이용하여 청색 및 적색 발광을 하는 형광체를 합성하였다. 합성한 형광체에 대하여 254 nm 및 147 nm 여기 하에서의 발광 세기에 관한 라이브러리를 완성하였고, 또한 형광체의 결정성과 입자 현상은 XRD와 SEM으로 특성을 관찰하였다. 조합검색 결과로부터 형광체의 발광특성은 P 자리에 치환되는 금속이온의 영향을 많이 받았다. 결과적으로 형광체와 비교하여 발광 효율이 우수한 새로운 형광체를 찾아내었다. The blue and red emitting phosphors were prepared by the combinatorial chemistry method. The combinatorial library was designed to investigate the luminescence of the phosphors under 254 nm and 147 nm excitations. In addition, the crystallinity and morphology of phosphors were checked by XRD and SEM. Based on the results from the combinatorial screenings, luminescent properties of phosphors are strongly dependent on the concentration of doping metal ions. It was found that a new phosphor shows excellent luminescent efficiency comparing to the red phosphor.
경량 GFRP 패널을 이용한 하수관거공사용 복공 가시설 시스템의 개발
박신전 ( Sin Zeon Park ),홍기증 ( Kee Jeung Hong ) 한국복합신소재구조학회 2014 복합신소재구조학회논문집 Vol.5 No.3
Recently, sewer?pipe constructions replacing deteriorated pipes are currently underway in the downtown area. To resolve many problems in the conventional method of open-cut construction, lining-board system using light-weight GFRP panels is developed. The pultruded GFRP panels can be successfully used for the developed lining-board system as temporary decks and retaining walls in virtue of light weight, high strength and high durability. In this paper, the structural safety and serviceability of the lining-board system are examined through FE analyses and experiments. Further more, a field application of the lining-board system is presented. The field application shows that quality and environment of construction can be significantly improved.