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디지털용 외부 전극층 재료를 이용한 형광램프의 특성비교
김수용,Kim, Soo-Yong 한국정보통신학회 2007 한국정보통신학회논문지 Vol.11 No.3
본 논문에서는 다양한 전극재료로부터 빛의 밝기와 저항을 측정분석 하였다. 외부전극의 새로운 재료와 공정기술은 램프제작에서 개선된 특성을 위해서 매우 중요하다. 본 실험에서는 외부 전극을 형성하기 위한 다른 세가지 타입은 구리와 알루미늄 테이핑, 은 접착, 니켈과 구리의 무전해 도금 방법들이다. 밝기측정에서 램프유리위에 외부 전극을 위한 니켈과 금 플레이팅 방법에 의한 휘도의 결과를 나타내었고, 또한 다른 전극재료를 사용한 방법에 의한 결과를 비교 하였다. 니켈과 금플레이팅 공정의 측정된 저항값은 휘도의 개선된 결과에도 불구하고 다소 높은 저항값을 나타내었다. 니켈과 니켈/금 도금방법은 가장 좋은 결과를 나타내었고, 사전 표면 식각에 따라 약간의 다른 휘도를 나타내었다. In this paper, the luminance and resistance from different electrode materials of external electrode fluorescent lamp are measured and analyzed. New materials and process technology of external electrode are very important for the developed characteristics in lamp fabrication. This experiment, three different types for the forming of external electrode are Cu and Al taping, silver paste, Ni and Cu electrode-less plating methods. In the measurement of luminance, the results of brightness by Ni and Au plating methods for the external electrode on lamp glass are presented and also compared with the results by the methods using different electrode materials. The measured resistance values of Ni and Au plating process showed a little bit higher than that of silver paste process in spite of developed results of brightness. The Ni and Ni/Au plating processes are demonstrated best results and also showed a little bit different brightness due to different previous surface etching treatments.
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50KW 터보제너레이터용 가스터빈 엔진의 설계점/ 탈설계/과도성능해석
김수용,박무룡,조수용,Kim, Su-Yong,Park, Mu-Ryong,Jo, Su-Yong 한국기계연구원 1997 硏究論文集 Vol.27 No.-
Present paper describes on/off design performance of a 50KW turbogenerator gas turbine engine for hybrid vehicle application. For optimum design point selection, relevant parameter study is carried out. The turbogenerator gas turbine engine for a hybrid vehicle is expected to be designed for maximum fuel economy, ultra low emissions, and very low cost. Compressor, combustor, turbine, and permanent-magnet generator will be mounted on a single high speed (82,000 rpm) shaft that will be supported on air bearings. As the generator is built into the shaft, gearbox and other moving parts become unnecessary and thus will increase the system's reliability and reduce the manufacturing cost. The engine has a radial compressor and turbine with design point pressure ratio of 4.0. This pressure ratio was set based on calculation of specific fuel consumption and specific power variation with pressure ratio. For the given turbine inlet temperature, a rather conservative value of $1100^\circK$ was selected. Designed mass flow rate was 0.5 kg/sec. Parametric study of the cycle indicates that specific work and efficiency increase at a given pressure ratio and turbine inlet temperature. Off design analysis shows that the gas turbine system reaches self operating condition at N/$N_{DP}$ = 0.53. Bleeding air for turbine stator cooling is omitted considering low TIT and for a simple geometric structure. Various engine performance simulations including, ambient temperature influence, surging at part load condition. Transient analysis were performed to secure the optimum engine operating characteristics. Surge margin throughout the performance analysis were maintained to be over 80% approximately. Validation of present results are yet to be seen as the performance tests are scheduled by the end of 1998 for comparison.
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