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송명규(Song, Myeong-Gyu),손동훈(Son, Dong-Hun),박노철(Park, No-Cheol),박경수(Park, Kyoung-Su),박영필(Park, Young-Pil) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.2
Optical image stabilization is a device to compensate the camera movement in the exposure time. The compensation is implemented by movable lens or image sensor that adjusts the optical path to the camera movement. Generally, the camera is moved by a handshake, thus the handshake is considered as an external disturbance. However, there are many other vibrations such as car and train vibration. In this paper, the optical image stabilization system in high frequency region is presented. Notch filter and lead compensator are designed and applied to improve the stability without changing the actuator. To verify the performance of the optical image stabilization system in high frequency region, the experiment equipment with moving object is established. It is confirmed that the opticalimage stabilization system does not diverge at the resonance frequency.
Design of Moving Magnet Type Optical Pickup Actuator with High Frequencies of the Flexible Modes
송명규(Song, Myeong-Gyu),김윤기(Kim, Yoon-Ki),박영필(Park, Young-Pil),유정훈(Yoo, Jeong-Hoon),박노철(Park, No-Cheol) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.11
Data transfer rate and storage capacity are main criteria of the performance of the optical disk drive. The highest data transfer rate and the largest storage capacity is most desirable. To increase these performances, the actuator of the optical disk drive should have a high servo bandwidth to compensate the vibration of an optical disk. The servo bandwidth is limited by some flexible modes of the actuator, thus it is essential to increase the natural frequencies of the flexible modes. In this paper, we suggested a moving magnet type actuator having high frequencies of the flexible modes. Generally, the moving magnet type actuator has an advantage to increase the natural frequencies of the flexible modes because the moving magnet type actuator has simple structure and the Young's modulus of magnet is high. However, large moving mass and inefficiency of EM(electromagnetic) circuit cut down driving sensitivities of the actuator. To improve driving sensitivities, we designed the model with the closed electromagnetic circuit for tracking direction. In addition, driving sensitivities and the natural frequencies of the flexible modes were improved by using DOE(design of experiments) for electromagnetic circuit and modifying the lens holder.
사회생태학 계열의 생태여성주의자들과 문화적 생태여성주의자들 사이의 논쟁
송명규 ( Song Myeong Gyu ) 한국지역개발학회 2003 韓國地域開發學會誌 Vol.15 No.4
This study reviews the debate between social ecological ecofeminists and culhual ecofeminists. Social ecology and cultural ecofeminism belong to modem radical ecological philosophy along with deep ecology. Social ecologists maintain that various forms of social hierarchies have caused the present global ecological crisis. In the other hand, cultural ecofeminists insist that the crisis is due to patriarchy. Though they have much in common as the inheritors of counter-cultural movement`s utopian vision, they have severely criticized each other since the middle of the 1980s. Social ecologists charge that cultural ecofeminism is a kind of reactionary ideology based upon irrational assumptions and practices such as Goddess worship and nature mystification. Cultural ecofeminists reprove social ecology for its dogmatic tendency to annihilate any opposition and to seize the ideological hegemony.