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여인선(I. S. Yeo),김홍범(H. B. Kim),김훈(H. Kim),지철근(C. K. Chee) 한국조명·전기설비학회 1996 한국조명·전기설비학회 학술대회논문집 Vol.1996 No.-
This paper describes the visual adaptation in the transition zone in the interior of museum. Peoples can feel the interior of exhibition room brighter than it is through two-stage adaptation of visual system, which enables comfortable viewing under somewhat low illuminance level. It is recommended using low-reflectance materials on the front wall of the museum, and providing sufficient tranzition zones in front of the exhibition room and in intermediate spaces between rooms.
이동호(D.H.Lee),곽재영(J.Y.Gwark),여인선(I.S.Yeo),정영춘(Y.C.Jung) 한국조명·전기설비학회 1997 한국조명·전기설비학회 학술대회논문집 Vol.1997 No.-
An electronic starter using MOSFET has been designed to take advantage of ideal preheating and starting features which can extend the lifetime of fluorescent lamps. The preheating circuit of the developed electronic starter is consisted of four parts - a full-wave rectifier circuit, an FET switching circuit, a timer circuit for the gate switching, and a circuit for end-of-life protection. The circuit is analyzed by using PSpice simulation, and is improved to give an appropriate starting-time through control of R-C time constant of the timer circuit. And the circuit is also provided with an end-of-life protection feature, which utilizes the negative resistance characteristics of a thermistor that is thermally linked to FET through a heatsink. This also protects the FET from any overheating problems. From the results of simulation it is possible to obtain an appropriate value on the starting time for proper ignition and also it is verified that the limit for resistance of the thermistor is dependant on the value of resistance in the timer circuit.
정영춘(Y. C. Jung),곽재영(J. Y. Gwark),여인선(I. S. Yeo) 한국조명·전기설비학회 1996 한국조명·전기설비학회 학술대회논문집 Vol.1996 No.-
This paper reports the development of an electronic starter for fluorescent lamps, which is so smartly designed that can be used directly in existing installations. The key point of the design lies in the protection of lamp filaments by sufficient preheating and at the same time in the control of time constant for start-up circuit. The starter is consisted of three system parts: a rectifier part, a switching part, and a gate control part. The characteristics of the developed electronic starter is compared with those of a conventional glow starter. As a result, blackening of lamps is almost reduced due to the stable and idealized start-up characteristics. And, furthermore, it is shown that its starting time is shortened at about half the level of the conventional one and the starting power is also reduced.