• Title/Summary/Keyword: Chung-Ju

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PID Comtroller Design using Pole-Placement in the Induction Motor (유도전동기에서 극점배치기법을 이용한 PID제어기 설계)

  • Kim, Young-Chun;Cho, Moon-Taek;Song, Ho-Bin;Jung, Hyung-Keun;Lee, Sik-Chung;Maeng, Seung-Ryoul;You, Jeong-Bong
    • Proceedings of the KAIS Fall Conference
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    • 2010.11a
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    • pp.370-373
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    • 2010

  • 본 논문에서는 유도전동기와 제어기의 폐루프 극점을 원하는 위치에 배치하여 유도전동기를 위한 PID제어 동조파라미터를 얻어 유도전동기를 제어하는 방법을 제안한다. 이러한 설계방법은, 설계요건뿐만 아니라 제어기 고유의 안정도와 강인성까지 제공하므로 매우 유용하다.

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A preliminary study of prehistoric tunnel-dwelling sites and rock-shelters in Che-Ju Island, Korea (제주도지방의 선사문화와 동굴${\cdot}$바위 그늘 주거지)

  • Lee, Chung-Kyu;Kang, Chang-Wha
    • The Korean Journal of Quaternary Research
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    • v.1 no.1
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    • pp.47-67
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    • 1987

  • Geologically speaking, many lava tunnels and caves are characteristic geomorphic features in Che-Ju Island. Especially, cave-ins are found along cliffs of shoreline and streams. The prehistoric early inhabitants in the island used the tunnels and cave-ins as their major shelters from palaeolithic period to the iron period (AD300-600). These tunnel-dwelling sites and rock-shelters are unsidered to be long-term shelters from the palaeolithic period to the neolithic period. However, these shelters and sites might be changed as temporary camping sites from the bronze to the iron period.

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Hydroxylamine Effect on the Determination of Dissolved Oxygen by the Azide-Modified Winkler Method and Polarography (修正된 아자이드 Winkler 법과 폴라로그래피에 의한 溶存酸素의 측정에 관한 하이드록실아민의 영향)

  • Chung, Keun Ho;Ree, Jony Iuir;Kim, Chun Seek
    • Journal of Environmental Health Sciences
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    • v.12 no.2
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    • pp.11-15
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    • 1986

  • Hydroxlamine effect on the determination of dissolved oxygen by the azide-modified Winkder method and polarography has been studied. It was found that hydroxylamine interference on the dissolved oxygen by the azide-modified Winklet method can be eliminated completely by using permanganate. An inexpensive and convenient polarograph device was constructed. Dissolved oxygen in an air-saturated 0.1 F KCl solution undergoes, independent of hydroxylamine concentrations a two-step irreversible reduction at the dropping electrode the $H_2O_2$ produced in the first step is reduced to $H_2$O in the second. Two waves of equal size result, the first with a half-wave potential (E1/2) at about -0.13 V and the second at about -0.91 V (vs. SCE).

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LLC Resonant Converter Composed of Two Transformers and Resonant Tanks (두개의 변압기와 공진 탱크로 구성된 LLC 공진 컨버터)

  • Kim, J.H.;Kang, S.I.;Kim, E.S.;Huh, D.Y.;Chung, Y.C.
    • Proceedings of the KIPE Conference
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    • 2008.10a
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    • pp.10-12
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    • 2008

  • 본 논문에서는 전원장치의 슬림화 및 저 가격을 위해 독립된 공진 탱크로 구성된 LLC 공진 컨버터를 제안하였다. 적용된 변압기는 슬림화를 위하여 두 개로 나누었으며 각 변압기에 독립된 공진 탱크를 구성하였다. 또한 두 개의 변압기의 2차 측 권선을 각각 교차하여 직렬로 연결하였고 부하변동에 대해서 상호 커플링 되어 있어서 12V출력 단 및 24V 출력 단 전압변동을 최소화 할 수 있는 250W 시제품을 제작하여 실험한 결과내용이다.

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