• Title/Summary/Keyword: Kwan Soo Lee

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The Design of Adaptive Controller for Nonminimum-Phase System using Approximate Inverse System (근사화 inverse 시스템을 사용한 비최소 위상플랜트의 적응제어기 설계)

  • Oh, Hyun-Cheol;Kim, Yoon-Sang;Jwa, Jong-Cheol;Lee, Jae-Chun;Kim, Jae-Il;Ahn, Doo-Soo
    • Proceedings of the KIEE Conference
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    • 1997.07b
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    • pp.575-577
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    • 1997
  • This paper presents a approach to the adaptive control of nonminimum-phase continuous-time systems. It is shown that pole-zero cancellations can be avoided by using approximate inverse systems. The computer simulation results are presented to illustrate the effectiveness of the proposed method.

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Comparison between S-CDMA and TDMA or Cable Modem Upstream Channel

  • Kim, Ki-Yun;Lee, Hyoung-Geun;Kim, pan-Soo;Park, Hyung-Jin;Cho, Bung-Hak
    • Proceedings of the IEEK Conference
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    • 2000.07b
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    • pp.760-764
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    • 2000
  • In this paper, we compare the major issues associated with TDMA and S-CDMA, which is planned to be adopted as a new cable modem technique for upstream channel. In particular, we mainly deal with the following 3 topics: MAC protocol, modem structure and BER performance comparison between TDMA and S-CDMA.

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A Switching Technique for Common Mode Voltage Reduction of 2-Level Inverter (2-레벨 인버터의 전도노이즈 저감을 위한 스위칭 기법)

  • Yun Hwan-Kyun;Kim Lee-Hun;Kim Jun-Ho;Won Chung-Yuen;Choi Ki-Soo;Bae Joung-Hwan
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.434-437
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    • 2001
  • Much attention has given to EMI effects created by variable speed ac drive system. This paper focuses on the switching technique to mitigate common mode voltage. Zero switching states of inverter control invoke large common mode voltage. Using inversed carrier wave, zero switching states are removed. In addition, proposed technique is easy to apply to existing 2-level inverter design. Simulation results show that common mode voltages adapting proposed technique are reduced regarding conventional method.

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