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金相彬,金榮鎬,李在周,魯承容 서울시립대학교 산업기술연구소 1994 산업기술연구소논문집 Vol.2 No.-
In this paper, electronic ballast for fluorescent lamp is studied which satisfies the requirement of high efficiency and high power factor and is adequate to be implemented into simple circuit. The active power factor enhancement circuit is designed to move up the power factor. As a frequency converter, zero voltage switching resonant converter (ZVS_RC) that has little switching loss is implemented, which is for increasing the efficiency. The experimental results with two FL40T12 fluorescent lamp show that the power factor of electronic ballast for fluorescent lamp is 99,7 percent and thet the efficiency of switching circuit is 82 percent.
반도체 검출기를 이용한 Hybrid 전치증폭기형 전자식 개인선량계 개발
이봉재,김봉환,장시영,김종수,노승용 대한방사선 방어학회 2002 방사선방어학회지 Vol.27 No.1
반도체 검출기를 이용하여 Hybrid 전치증폭기를 갖는 전자식 개인선량계를 설계 제작하고, 방사선 검출 반응특성과 기계적 및 주변 환경 요건에 따른 각종 성능을 평가하였다. ^137Cs 감마 방사선을 이용한 방사선 조사 시험결과 감도는 3.8 cps/Gy·h^-1이고, 10 uSv ∼ 4 Sv 범위의 선량당량 조사시 선량계의 지시값은 오차 8%이하에서 선형성이 잘 유지되었다. 방향의존성은 ±60˚이내에서 4%이하이며 ISO 기준선장에 의한 에너지 반응역역은 60 ∼ 1,250 keV로 나타났으며 IEC, 61526에 의한 선량계의 성능검사시 9개 영역의 시험항목에 대한 국제기준을 만족하였다. An electronic personal dosimeter(EPD) with hybrid type preamplifier adopting a semiconductor detector as a radiation detector has been developed, manufactured and test-evaluated. The radiation detection characteristics of this EPD has been performance-tested by using a reference photon radiation field. After several test-irradiations to a ^137Cs gamma radiation source the radiation detection sensitivity of this EPD appeared to be 3.8 cps/Gy·h^-1, The linearity of radiation response was kept within 8% of the dose equivalent ranges of 10 uSv ∼ 4 Sv and the angular dependence was under less than 4% in angles of ±60˚. It was confirmed that the energy response range was in 60 ∼ 1,250 keV given in the ISO standard. This EPD satisfied the international criteria for the EPD in the mechanical and the environmental performance test for 9 test categories according to IEC 61526.
A Study on Erasing Discharge of AC-PDP using V-Q Lissajous' Figure
Choi, C. H.,Jee, Y. S.,Park, S. W.,Rho, S. Y. 서울시립대학교정보기술연구소 2002 정보기술연구소 논문집 Vol.4 No.-
In this paper, we study plasma discharge characteristics with direct current measuremen Lissajous' figure when AC-PDP is driven with only sustain voltage. Through above st measure the erasing discharge and its effects using Lissajous' figure. As a result of experiment, we can confirm the erasing discharge at the Lissajous' figure the wall voltage drop using V-Q Lissajous' figure. Through this works, we can know that discharge itself has an influence on next discharge and results in influencing on. firi discharge current.