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적응형 바이어스와 PBG를 이용한 Doherty 전력 증폭기 전력효율과 선형성 개선에 관한 연구
이왕열,서철헌,Lee Wang-Yeol,Seo Chul-Hun 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.8
본 논문에서는 적응형 바이어스와 PBG 구조를 이용하여 Doherty 증폭기의 효율 및 선형성을 개선하였다. PBG 구조를 출력 정합회로에 구현하였으며, 적응형 바이어스를 peaking amplifier에 적용하여 Doherty 증폭기의 효율뿐 아니라 선형성을 개선할 수 있었다. 제안된 구조를 이용한 Doherty 증폭기는 기존의 전력증폭기에 비해 PAE $12\%$, $IMD_3-7.5dBc$ 개선하였다. In this paper, adaptive bias circuit and PBG structure have been employed to suppress IMD(Inter-Modulation Distortion) and improve PAE(Power Added Efficiency) of the Doherty amplifier. Gate bias voltage has been controlled with the envelope of the input RF signal and PBG structure has been employed on the output port of Doherty amplifier. The proposed power amplifier using adaptive bias circuit and PBG has been improved the $IMD_3$ by 7.5 dBc, and the average PAR by $12\%$, respectively.
李旺烈,成圭寶,徐興錫,李承魯 한양대학교 의과대학 1984 한양의대 학술지 Vol.4 No.1
Neurofibromatosis is a congenital and hereditary dysplasia which was first described by von Recklinghausen in 1882. It usually involves supporting tissue of nervous system, but any organ can be involved. It was also known that malignant changes occur in about 10% of disease. We would like to report our experience with a generalized neurofibromatosis combined with bilateral acoustic neuromas.
電算化斷層撮影術上 高密度로 보이는囊性頭蓋咽頭腫 : 1 例報告
成圭寶,李相吉,李旺烈,李承魯 한양대학교 의과대학 1983 한양의대 학술지 Vol.3 No.2
Characteristic computed tomographic (CT) findings of typical craniopharyngioma regarded as calcification, cyst formation, and contrast enhancement of solid portion. But recently, atypical lesions are reported including high density in cystic area. Hyperdense area in CT is largely due to the high concentration of intracystic protein. Recently we experienced 1 case of surgically proved dense cystic craniopharyngioma and reported with a brief review of the literatures.
자동차용 휠 베어링의 Orbital Forming 해석
이승표(Seungpyo Lee),이왕열(Wangyeol Lee),조영걸(Younggeol Cho) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, the orbital forming analysis of automotive wheel bearing was performed by finite element method. Commercial software MSC.MARC was used and 2-dimensional axisymmetric element was applied. Deformation, stress, and force direction were calculated and investigated for the design aspect. To verify the reliability of this study, experiment was carried out and compared with analysis results. The experiment results showed good agreement with the analysis results.