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김영철(Y.C.Kim),전중함(J.H.Chun),김광태(K.T.Kim),유권종(K.J.Yu),서기영(K.Y.Su),이현우(H.W.Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
This paper present a buck-boost PWM inverter and its application for residential system The PWM power inverter is realized by driving a inverter constructed with a high frequency buck-boost chopper in the discontinuous conduction mode(DCM).<br/>
안승준,김대욱,김영철,안성준,김영정,김호섭,Ahn S,Kim D. W,Kim Y. C,Ahn S. J,Kim Y. J,Kim H. S 한국재료학회 2004 한국재료학회지 Vol.14 No.3
An electron beam microcolumn composed of an electron emitter, micro lenses, scan deflector, and focus lenses have been fabricated and tested in the STEM mode. In this paper, we report a technique of precisely aligning the electron lenses by the laser diffraction patterns instead of the conventional alignment method based on aligner and STM. STEM images of a standard Cu-grid were observed using a fabricated microcolumn under both the retarding and accelerating modes.
RFID를 이용한 고령자 행동 패턴 학습 시스템 설계 및 구현
구영현(Y.H Gu),강한훈(H.H Kang),김영철(Y.C Kim),박수준(S.J Park),유성준(S.J Yoo) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2C
오늘날 갈수록 인구의 고령화가 심각해지고 있다. 이러한 고령화로 인하여 노약자들을 위한 다양한 환경과 시스템이 필요한데 행위 인식 기술은 이러한 기술의 전처리 기술로서 활용될 수 있다. 본 논문에서는 RFID tag와 Reader를 이용하여 정보를 가져온 뒤 사용자의 행위를 추론하고 이를 기록하는 시스템을 설계 및 구연을 하였고 앞으로 개선되어야 할 부분을 지적하였다.
김홍,이부영,이준호,김영철,Kim H,Lee B. Y,Lee J. H,Kim Y. C 한국초전도학회 2004 Progress in superconductivity Vol.6 No.1
The policrystalline$SmBa_2$$Cu_2$$O_{y}$ was synthesized by the solid state reaction method. The dependence of AC susceptibility on temperature and applied ac field was studied. The critical temperature $T_{c}$ is about 92 K. As the ac field is increased, the slope and the value of real part of susceptibility become smaller and the peak position of imaginary part $T_{P}$ was shifted to a lower temperature with peak broadening. Using Bean's model, we determined intergrain critical current density $J_{c}$ and obtained $44 A/{cm}^2$ at 75 K. From the relation of the $J_{c}$ (T)=($1-T/T_{c}$ )$^{\beta}$ we obtained $\beta$=0.8 and found that the Josephson junction type of the $SmBa_2$$Cu_2$$O_{y}$ is SIS junction. The peak of the imaginary part shifts to higher temperature with increasing frequency, f. from Arrhenius plot, we obtained the activation energy of about 0.96 eV.