• Title/Summary/Keyword: Chun-Kwang

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Optical Power Transfer of Grating-Assisted Directional Coupler with Three-Guiding Channels: TM modes Case

  • Ho, Kwang-Chun
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2003.11a
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    • pp.126-130
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    • 2003

  • The optical power transfer of TM modes in grating-assisted directional couplers (GADCs) with three-guiding channels is rigorously evaluated by defining a novel coupling efficiency amenable to the rigorous analytical solutions of modal transmission-line theory (MTLT). The results reveal that the incident power is sensitively partitioned through three output channels in terms of such grating parameters as the period, the duty cycle, and wavelength.

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Design of High Performance 5 Phase Step Motor Drive System with Current Control Loop (전류 제어기를 가지는 고성능 5상 스텝 모터 구동 드라이버 설계)

  • Chun Kwang-Su;Kim Hak-Jin;Kwon Yong-Kwan;Kang Suk-Hee
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.311-315
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    • 2006

  • This paper proposes 5 phase step motor drive system has high performance dynamics with micro step control has current controller. In this paper, analog current controller has been developed to minimize system size and cost. The validity of the proposed technique is verified through experimental results of position control robot.

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