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대면적 LCD 백라이트용 LED 배열 구조의 시제품 제작 및 성능 분석
이부형(Boo-Hyung Lee),류장렬(Jang-Ryul Ryu) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
본 논문에서는 적은 열발생, 양호한 광량 및 광균일도를 얻을 수 있는 대면적 LCD BLU 용 LED 배열구조로 거리가 조절된 등간격 배열의 구조(LED Array Type 12)를 선택하여 시제품을 제작한 후 시제품의 광균일도, 조도, 온도를 측정하였다. 측정결과 목표대비 101%의 광균일도, 236%의 조도, 150%의 온도를 얻을 수 있어 양호한 결과를 입증하였다. In This paper, the LED Array prototype for using in Large area LCD BLU is designed and its performances are measured. LED array prototype have LEDs which are arranged with equal distances but the narrowest gaps.(LED Array type 12). It is showed that The LED array prototype which is designed in this paper have the luminous intensity uniformity of 101% , luminous intensity of 236% and temperature of 150% over target values.
Flame Retardancy and Electrical/Mechanical Properties of LDPF/EVA Blend
류부형,이청,김기엽,Ryu, Boo-Hyung,Lee, Chung,Kim, Ki-Yup The Korean Society of Safety 2008 한국안전학회지 Vol.23 No.4
In this research, magnesium hydroxide as a flame retardant agents and zinc borate as a synergist were mixed with LDPF/EVA blended samples, in order to improve their flame retardancy. We attempted to select the best mixing ratio of the LDPF/EVA blend and the optimum amount of magnesium hydroxide and zinc borate by the comparison and analysis of the flame retardancy, the electrical properties such as the volume resistivity and dielectric loss tangent, and the mechanical properties such as the tensile strength and elongation at break. Particularly, specimen which is the 6phr of zinc borate and 10phr of magnesium hydroxide 70/30phr adding to the LDPF/EVA blended samples has been most excellent in flame retardancy and electrical/mechanical properties. 본 연구에서는 저밀도 폴리에틸렌과 에털렌 비닐 아세테이트 블렌드(LDPF/EVA)의 난연성을 향상시키기 위해 난연제인 수산화 마그네슘과 난연상승보조제인 zinc borate를 첨가한 후, 난연성과 체적저항률, 유전정접, 교류 절연파괴강도 등의 전기적 특성, 인장강도 및 연신율 등의 가계적 특성을 비교 분석하여 가장 우수한 LDPF/EVA 블렌드의 혼합비 및 적절한 $Mg(OH)_2$의 zinc borate의 첨가량을 선정하고자 하였다. 혼합비 70/30phr의 LDPF/EVA 블렌드에 10phr의 $Mg(OH)_2$와 6phr 정도의 zinc borate를 첨가한 시편에서 가장 우수한 난연성 및 전기/기계적 특성을 나타내었다.
목차 : 트리억제제가 첨가된 LDPE의 방사선 조사에 따른 절연특성 변화
류부형 ( Boo Hyung Ryu ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.2
The effectiveness of treeing resistance in low density polyethylene containing azocompounds were investigated under radiation environments, 4-(4-nitrophenylazo)-1-naphthol and 4-(4-nitmphenylazo) resorcinol were selected for treeing inhibitors, LDPE containing the additives were crosslinked with dicumyl peroxide, irradiated by Co60 y-ray in the presence of air at room temperature, Treeing inception voltage, AC breakdown strength measurements were carried out for electrical insulation characteristics, thermoluminescence and gel contents were analyzed as various irradiation doses also. LDPE with treeing inhibitors showed much better insulation characteristics than pure LDPE. It is interpreted that molecular structures, polar groups and the type of radicals connected on the benzene ring of the additives affected ele-ctrical characteristics. From the results, 4-(4-nitmphenylam) resorcinol was the most effective upon the best treeing and radiation resistance.