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崔圭萬 관동대학교 1992 關大論文集 Vol.20 No.2
The electroluminescent device has been prepated by screen printing method. Its brightness showed 25Ft.L when applied voltage and freguency were 120v and 400Hz. The brightness characteristic of a organic dispersion electroluminescent device changes in accordance with applied voltage and frequency. Brightness was increased linearly against voltage between 50v and 150v normally used voltage range. Brightness was increased with the increase of frequency and the main peak on spectrum moved toward blue. The brightness of a organic dispersion electroluminescent device depends on the surrounding temperature. To make a white organic dispersion electroluminescent device, Rhodamin was applied on Zn S: Cu as 7 ×10-³wt.%, and the chromaticity coordinates were χ=0.32 and y=0.38
崔圭萬 관동대학교 1997 關大論文集 Vol.25 No.2
The studies on the design and application for a ballast by means of the mathematical formula, and on the fabrication of a electronic stater are performed. As a results, many different types of ballasts have been designed and examined in a comparison with the values calculated by design formula. For example, the ballast for managing 20W power was designed and fabricated by using these design concepts. It could be found out that the formula for designing ballast was very useful. The initial characteristics of the electronic starter fabricated were better than those of the existing glow starter at the time of turn-on. It was expected the electronic starter to extend the life time of a fluorescent lamp by means of turn-on/off test.
최규만,이윤식 關東大學校 産業技術開發硏究所 2008 산업기술논문집 Vol.- No.25
LED를 이용하여 20W의 조명용 광원을 제작했다 LED에서 발생되는 열을 효과적으로 제한 할 수 있는 방열 시스템을 설계하고 그 특성을 조사했다. LED는 온도가 높아질수록 휘도가 떨어지는 특성을 보였는데 최적의 설계를 통해 LED의 온도 상승을 최대 60이하로 제한하여 할 수 있었고, 이 조건 하에서 가장 높은 휘도를 얻을 수 있었다. 본 연구에서 구현된 조명장치는 20W급 형광등의 밝기와 비교했을 때 2배 이상 높은 결과를 보였다.
崔圭萬 관동대학교 1996 關大論文集 Vol.24 No.1
By fabricating ZnS:Cu,Br and ZnS-Cd:Cu,Br and investigating their life characteristics, the deterioration mechanism and the method to improve their maintenance are studied. Phospors fabricating process conditions are efficient for improving their life. Especially, annealing temperature has relation to a half life and this suggest that the crystal quality is changed by annealing temperature. The reason the annealed phospor at 400℃ has a short life may be that the phospor's ion drift is fast. To make ling life phospor, ZnS-CdS:CuBr is fired at 800℃ for 1hr in H₂S, baked at 650℃ for 2hrs in air and quenched and secondly baked at 650℃ for 1/2hr in air and quenched.
崔圭萬 관동대학교 1994 關大論文集 Vol.22 No.2
ITO(Indium tin oxide) transparent conducting flims have been fabricated by electron beam evaporation onto glass substrates. The dependence of electrical and optical properties on substrate temperature, SnO2 doping rate, oxygen partial pressure and postdeposition heat treament and the crystallization of the ITO films have been studied. The optimum fabrication conditions were such that substrate temperature was above 300℃, oxygen partial pressure was 4×10??torr, SnO2 doping rate was 10mole%. In this case, the sheet resistance and transmittance at 5500Å wavelength were 12Ω/□ and 99%, respectively. These changes of electrical and optical properties have been correlated with crystallization of ITO film.
미생물 연료전지의 전극 재료와 구조에 따른 전기적 특성
최규만,Choi, Kyu-man 한국정보전자통신기술학회 2014 한국정보전자통신기술학회논문지 Vol.7 No.1
폐수 속에 들어있는 미생물을 이용해서 전기를 얻을 수 있도록 고안된 것이 미생물 연료전지이다. 본 논문에서는 미생물 연료전지의 전극 재료와 구조에 따른 전기적 특성을 조사했다. 구리판을 캐소드 전극으로 사용한 연료전지는 구리판의 산화 반응에 따른 전압역전현상이 관찰되어 백금판을 전극으로 사용한 연료전지보다 낮은 출력 전압을 나타내었다. 구리판을 전극으로 사용한 경우 전극판의 간격이 작을수록 높은 전압특성을 나타내었고 면적이 넓을수록 최고출력전압이 나타나는 시간이 지연되는 특성을 보였다. MFC(microbial fuel cell) is the device to produce the electricity by using the microbes which are living in the waste water. In this paper, the electric characteristics of the MFC were investigated according to each different structure and electrode materials. The voltage being reversed phenomenon was observed in the MFC which uses the cupper plate as the cathode material. This result comes from the oxidation reaction of the cupper plate electrode in this MFC. And this MFC has lower output voltage than one that has a platinum plate electrode. The smaller gap distance of the cupper plate electrode of the MFC showed the higher output voltage. The larger electrode area of the cupper plate electrode showed that the reaching time of the output voltage to the maximum value was delayed.