• 제목/요약/키워드: Lee In-bok

검색결과 5,726건 처리시간 0.041초

디지털 후퇴 유한시간 구간 LQ 최적 윤곽제어시스템 (Digital Receding Time Horizon LQ Optimal Contour Control System)

  • 심영복;이건복
    • 한국공작기계학회논문집
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    • 제15권6호
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    • pp.105-113
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    • 2006

  • This work is concerned with the development of digital contouring controller for multi-axial servosystems. Digital optimal contouring controller is proposed to coordinate each of the controllers of multiple feed drives and specifically improve the contouring performance. The optimal control formation includes the contour error explicitly in the performance index to be minimized. The contouring control is exercised for straight line and circular contours. Substantial improvement in contouring performance is obtained for a range of contouring conditions. Both steady state and transient error measures have been considered. The simulation study presented has established the potential of the proposed controller to improve contouring performance.

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2축 시스템의 비대칭 윤곽제어 (Asymmetrical Contouring Control of Biaxial System)

  • 심영복;정유철;이건복
    • 한국정밀공학회지
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    • 제14권8호
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    • pp.65-72
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    • 1997

  • An asymmetrical cross-coupled compensator to improve the contouring performance is proposed. This is a refinement of the structure suggested by Koren. The position loop is closed with a proportional controller as in the uncoupled system. An additional input term proportional to the component of the contour error along the corresponding axis is included. The controller gains are chosen to give an appropriate frequency response and an optimum range for the damping ratio. The effectiveness of the proposed controller is studied by means of digital simulations of the dynamics of the drives and the controller for 4 types of command trajectories: straight line contour, cornering contour, circular contour, elliptic contour. Substantial improvement in contouring performance is obtained for a range of contouring conditions.

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Genetic diversity and population structure of Korean eelgrass, Zostera mirina

  • Huh, Man-Kyu;Cui, Jin-Zi;Lee, Hak-Young;Lee, Kun-Seop;Lee, Bok-Kyu
    • 한국어업기술학회:학술대회논문집
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    • 한국어업기술학회 2003년도 춘계 수산관련학회 공동학술대회발표요지집
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    • pp.277-278
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    • 2003

  • The Korean populations of Z. marina are typically distributed in patches. Although molecular and biochemical approaches are now increasingly being applied to address the taxonomic and phylogenetic relationships within the animals, plants, and other algal species in Korea (Huh 1998; Hwang et at. 1998; Huh 2001), no population genetic studies of this species have been conducted. (omitted)

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