http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
배문섭,오상호,조양구,이확주,Bae, Moon-Seob,Oh, Sang-Ho,Cho, Yang-Koo,Lee, Hwack-Joo 한국현미경학회 2004 Applied microscopy Vol.34 No.1
주사전자현미경(SEM)에서 전자를 발생시키는 전자총 부분의 고압발생 장치를 설계 제작하고 그 안정성을 시험하였다. 고전압을 발생시키는 switching 주파수는 고압트랜스의 1차 측 임피던스와 인덕턴스에 matching 되는 주파수에서 최적의 전압 안정도가 유지되었다. 1차 측의 고압트랜스의 turn 수가 적으면 인덕턴스가 낮으므로 최적적인 matched switching 주파수가 높은 쪽으로 올라간다. 최대 출력 전압은 -30 kV 이상 출력되었으나 안정도는 출력전압이 -5 kV에서 10 kV 범위에서 가장 좋게 나타났다. 23.8 kHz에서 출력파형의 흔들림 없었고 DC 고전압 출력 또한 최고의 안정도을 보였다. 이때 도출된 전압 안정도는 ${\pm}0.002%$였다. The high acceleration voltage system used in scanning electron microscope were designed and manufactured to test its stability. The Cockcroft-Walton circuits are used both in the cathode voltage up to -30 kV and in the Wehnelt cylinder of -2 kV. The operating voltage of 6 V was applied to the heating of the filament. The wave forms which are formed in the second leg of the high voltage transformer were observed in the oscilloscope with 2 V of DC input. When the high voltages were in the range between 5 kV and 12 kV, the highest value of the stabilities of the generated voltages was obtained as 0.002%.
LED조명 반사 스펙트럼이 적분구 광학 특성에 미치는 영향
배문섭(Mun-Seob Bae),류우찬(Uh-Chan Ryu) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.7
To measure optical properties of an LED lamp with a colored surface using an integrating sphere, its properties are influenced by not only the emission color of the lamp but also the color of the non-emitting surface. This study was conducted to evaluate the effect of the non-emitting color surface experimentally. The fluctuations of the optical properties according to the various colors and sizes of the non-emitting surface of the LED lamp were tested and analyzed in an integrating sphere as recommended in the IES LM-79-08. It is possible to correct the total luminous flux(TLF) less than 1.7%, the xy color coordinates 0.0014, the correlated color temperature(CCT) 62K, color rendering index(CRI) 0 even though the non-emitting surface area is up to 2.9% of the surface area of the integrating sphere. Through the calibration process it is possible to suppress the TLF to 5%, CCT 170K, CRI 1, while the non-emitting surface area is increased to 9.28% of that of the integrating sphere.