• Title/Summary/Keyword: Kyungbook

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Design of a Planar Antenna for Wireless Communication Isolation Detector (무선 통신용 아이솔레이션 디텍터에 사용되는 평면형 안테나 설계)

  • Park, K.U.;Heo, Y.K.;Lee, J.K.;Mun, S.Y.;Cho, Y.K.
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.454-458
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    • 2003

  • It is well known that the antenna for wireless Tx/Rx isolation detector should have the broadband characteristics. Such antennas can be applied in all the frequency ranges such as Cellular, PCS, IMT-2000. In this paper, using the Finite-Difference Time-Domain(FDTD) method, one design example is given for the antenna operating in the frequency ranges of $800MHz{\sim}900 MHz$, $1.7GHz{\sim}2.2GHz$.

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Generalized Scattering Matrix of Multi-port($2{\times}2$port, 1port) Rectangular Waveguide Using $TE^z_{mn}$ Mode Matching Method ($TE^z_{mn}$ 모드정합법을 이용한 다중포트($2{\times}2$포트, 1포트) 직사각형 도파관의 일반화 산란행렬 추출)

  • Lee, J.K.;Mun, S.Y.;Park, K.U.;Heo, Y.K.;Cho, Y.K.
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.79-83
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    • 2003

  • Multi-port($2{\times}2$port, 1port) rectangular waveguide discontinuity problem has been analyzed by use of $TE^x_{mn}$ (mono)mode matching method. Matrix size can be reduced significantly in comparison with $TE_{mn}&TM_{mn}$(full-wave)mode matching method. the present results is compared with those by CST MicroWave Studio to validate the presint method.

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The Forecasting for the Numbers of a High-school Graduate and the Number Limit of Matriculation in Kyungbook

  • Kim, Jong-Tae
    • Journal of the Korean Data and Information Science Society
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    • v.16 no.4
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    • pp.969-977
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    • 2005

  • Recently, the decrease of the number of a high-school graduate have serious influences on the number of a limit matriculation of colleges and universities. Based on the resident registration population, we forecast for the number of a high-school graduate until 2022 year in kyungbook. Most college and universities in Kyungbook have to reduce the 67.8% of the number of limit matriculation until 2022 year to avert a disaster by prompt action.

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Statistical Survey about the Rates of Application for the 2005 Susi Second Semester Admission to Universities in Daegu and Kyungbook

  • Kim, Jong-Tae
    • Journal of the Korean Data and Information Science Society
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    • v.15 no.4
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    • pp.845-853
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    • 2004

  • This study is to adjust the focus on the statistical survey about the rates of application for the 2005 Susi second semester admission to Universities in Daegu, Kyungbook. The decrease of population for university admission and the change of paradigm of selecting a field of specialization in university will have an adverse effect on ratios of admission. This is very important to the future of university in Daegu, Kyungbook.

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Novel H-bridge Multi-level Inverter with DC-link Switches (DC링크 스위치를 갖는 새로운 H-브릿지 멀티레벨 인버터)

  • Sun, Ho-Dong;Park, Min-Young;Park, Jong-Hyung;Kim, Heung-Geun;Chun, Tea-Won;Nho, Eui-Cheol
    • Proceedings of the KIPE Conference
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    • 2010.11a
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    • pp.9-10
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    • 2010

  • 본 논문에서는 멀티레벨 인버터의 토폴로지로서 H-bridge 토폴로지를 기본으로 하여 2개의 전력용 스위치와 2개의 diode를 DC 링크에 연결한 변형된 구조를 제안한다. 제안된 방식은 계통 연계형 단상 멀티레벨 인버터로서 기존의 단상 인버터에 비하여 출력전압 파형이 정현파에 가깝고, 고압 대용량 시스템용 멀티레벨 인버터로의 확장도 용이할 뿐만 아니라 cascade연결을 통하여 간단히 전압레벨을 확장 할 수 있다는 장점을 가진다. 제안된 토폴로지의 타당성은 실험을 통하여 검증하였다.

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