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강동민,문동주,류종우,이상득,안병성 한국공업화학회 2002 응용화학 Vol.6 No.2
The fine grinding characteristics of alumina were investigated by an attrition mill. The grinding kinetics approach was successfully applied to the analysis of particle size distributions obtained under various grinding times. The particle size distributions estimated from grinding rate constant were in good agreement with the experimental data. It was found that the grinding rate constant for the alumina decreased with increasing solid contents.
P-HEMT를 이용한 능동 안테나용 X-Band MMIC 저잡음 증폭기 설계 및 제작
강동민,맹성재,김남영,이진희,박병선,윤형섭,박철순,윤경식 한국전자파학회 1998 한국전자파학회논문지 Vol.9 No.4
능동 안테나용 X-band(11.7~12 GHz)단일 칩 초고주파 집적회로(Monolithic Microwave Integrated Circuits, MMICs) 저잡음 증폭기(Low Noise Amplifier, LNA)를 $0.15{\mu}m\times140{\mu}m$ AlGaAs/InGaAs/GaAs 고속 전자 이동도 트랜지스터(Pseudomorphic-High Electron Mobility Transistor, P-HEMT)를 이용하여 2단으로 설계하고 제작하였다. 증폭기의 안정도 특성을 위해 이득이 다소 감소하나 입력정합이 쉽고 안정도가 좋은 소스 인턱터를 사용하여 저잡음증폭기를 설계하였다. 동작 주파수에서 약 17dB의 이득, 1.3 dB의 잡음 지수 그리고 입.출력 반사손실은 -17~-15dB를 측정 결과로서 얻었다. 이러한 측정 결과는 잡음 지수를 제외하고는 설계 결과와 거의 일치하며, 제작된 MMIC LNA의 칩 크기는 $1.43\tiems1.27mm^2$이다. The design and fabrication of X-band(11.7~12 GHz) 2-stage monolithic microwave integrated circuit(MMIC) low noise amplifier (LNA) for active antenna are presented using $0.15{\mu}m\times140{\mu}m$ AlGaAs/InGaAs/GaAs pseudomorphic high electron mobility transistor (P-HEMT). In each stage of the LNA, a series feedback by using a source inductor is used for both input matching and good stability. The measurement results are achieved as an input return loss under -17 dB, an output return loss under -15dB, a noise figure of 1.3dB, and a gain of 17 dB at X-band. This results almost concur with a design results except noise figure(NF). The chip size of the MMIC LNA is $1.43\times1.27$.
Chern-Simons Theory on $L(p,q)$ Lens Spaces and Localization
강동민 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.12
Using localization technique, we calculate the partition function and expectation values of Wilson loop operators in Chen-Simons theory on general lens spaces $L(p,q)$ (including $S^2 \times S^1$). Our results are consistent with known results.