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도재휘(Jae-Hwee Doh),김병성(Byung-Sung Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
In this paper, we present a design optimization technique of CMOS low noise amplifier (LNA) above 20 ㎓. The optimum gate width is derived for shunt input matching topology. Additionally the layout optimization is performed using multiple common-source FETs. Based on the proposed technique, the CMOS LNA operating at 24 ㎓ is designed using 0.18-㎛ CMOS technology. Simulation results show a noise figure of 2.4 ㏈ with a power gain of 16.6 ㏈ for l1.1㎽ power consumption.
Opening New Horizons with the L4 Mission: Vision and Plan
조경석,황정아,한정열,최성환,박성홍,임은경,김록순,서정준,손종대,송동욱,곽재영,Miyashita Yukinaga,백지혜,이재진,이진성,류광선,선종호,진호,예성준,문용재,이대영,Peter H. Yoon,Thiem Hoang,Sterken Veerle,Joshi Bhuwan,이창한,장종진,도재휘,김화영,박현정,Natchimuthuk Gopalswamy,Tala 한국천문학회 2023 Journal of The Korean Astronomical Society Vol.56 No.2
The Sun-Earth Lagrange point L4 is considered as one of the unique places where the solar activity and heliospheric environment can be observed in a continuous and comprehensive manner. The L4 mission affords a clear and wide-angle view of the Sun-Earth line for the study of the Sun-Earth and Sun-Moon connections from he perspective of remote-sensing observations. In-situ measurements of the solar radiation, solar wind, and heliospheric magnetic field are critical components necessary for monitoring and forecasting the radiation environment as it relates to the issue of safe human exploration of the Moon and Mars. A dust detector on the ram side of the spacecraft allows for an unprecedented detection of local dust and its interactions with the heliosphere. The purpose of the present paper is to emphasize the importance of L4 observations as well as to outline a strategy for the planned L4 mission with remote and in-situ payloads onboard a Korean spacecraft. It is expected that the Korean L4 mission can significantly contribute to improving the space weather forecasting capability by enhancing the understanding of heliosphere through comprehensive and coordinated observations of the heliosphere at multi-points with other existing or planned L1 and L5 missions.