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윤지섭,강이석 대한기계학회 1995 대한기계학회논문집 Vol.19 No.6
This paper addresses design procedure and testing results of a closed-loop motion control of the cranes. When the object is stopped at the desired position, swinging occurs, and such swinging deteriorates the safety and efficiency of the operation of the crane. Therefore, in this paper, the cascade anti-swing and trolley position feedback controller are designed. Anti-swing controller rapidly eliminates swinging of object and position feedback controller reduces the trolley position error. The performance of this controller is investigated through the computer simulation and experiment. From the results of a series of computer simulations and experiments it can be concluded that proposed controller effectively reduces swinging of the object and trolley position error, which shows this controller can be used as an effective tool for the precise control of overhead cranes.
원격 감시카메라 자동추적시스템의 퍼지제어기 개발에 관한 연구
윤지섭,박영수 대한기계학회 1994 대한기계학회논문집 Vol.18 No.8
This paper presents the development of a fuzzy controller for driving camera pan/tilt device so that the camera's viewing direction can automatically track a moving object. To achieve computational efficiency a non-contact type displacement follower is used as a feedback sensor instead of a vision camera. The displacement follower, however, is extremely sensitive to object's lighting condition and results in unstable response at high speed. To this end, a fuzzy controller is developed in such a way to provide stable tracking performance at high speed where the sensory signal is subjected to intermittant disturbances of large magnitude. The test result shows stable tracking response even for high speed and non-uniform lighting condition. The resulting camera autotracking system can be adopted as an effective tool for visual transfer in the context of teleoperation and autonomous robotics.
윤지섭,조형석 대한기계학회 1984 대한기계학회논문집 Vol.8 No.2
본 연구에서는 유압식 방법보다 절삭 정밀도가 높고 전기신호를 사용함으로 인한 조작과 증폭이 간단하고 특성 개선을 위한 조작과 증폭이 간단하고 특성 개선을 위한 계의 보상(sysyem compensation)을 할 수 있는 전기 유압식 모방장치를 설계, 제 작하여 그 성능을 실험적으로 해석하였다. An electro-hydraulic copying system is developed and its performance is experimentally investigated. As compared with a mechanical hydraulic coping system, this system has a basic difference in that; (1) the stylus movement is converted into an electrical signal via a position transducer. (2)the actuator displacement is also measured by a position sensing element, which serves as a feedback signal. Since the system parameters affect the control performance, the response characteristics such as percentage overshoot, rise time, settling time and steady state error are experimentally obtained under variation of these variables. The system parameter include supply pressure, servo amplifier gain and feedback gain. The experimental result shows that the cutting tool follows a stylus input motion to a desirable accuracy. The implication of this result indicates that the developed system can enhance the copying accuracy of the conventionally used mechanical type of hydraulic copying system.
윤지섭 한국국방연구원 2019 국방정책연구 Vol.35 No.2
무기이전은 냉전기 미국의 중요한 군사원조 정책수단 중 하나였다. 미국은 무기이전을 통해 동맹을 관리, 강화하고자 하였다. 본 연구는 미국이 동맹국에 이전한 무기의 질적 차이에 주목하여 다음과 같은 연구질문을 설정하였다. “왜 냉전기 미국은 일부 동맹국에는 첨단무기를, 일부 동맹국에는 구식무기를 이전하였는가?” 본 연구에서는 관련 기존연구를 검토하여 가설을 수립하였고, 이를 통계 분석을 통해 실증적으로 검증하였다. 분석 결과, 미국의 무기이전은 철저히 현실주의적 사고에 기반함을 알 수 있었다. 미국은 동맹국의 군사력이 강할수록 첨단무기를 이전하는 경향이 높았으며, 경제적 수준이 높은 동맹국에 대해서는 첨단무기 이전을 자제하는 경향을 보였다. 이는 미국이 동맹국을 무조건적으로 지원하는 것이 아니라, 자국의 이익에 바탕하여 동맹국을 지원, 관리하고자 하는 의도를 나타내는 결과이다. Arms transfer was one of the most crucial means of the United States military assistance. The United States tried to manage and strengthen its allies through arms transfer. This study set up a research question, “Why the United States did transfer ‘advanced’ arms to some allies, while ‘obsolete’ arms to others?”, focusing on qualitative variation of arms transferred by the United States during the Cold War. This study formulates some hypotheses through reviewing relevant literatures, and empirically analyzes these hypotheses using a statistical method. According to the analysis, the more ‘military capability of the ally’ increase, the more likely transferring advanced arms become. On the other hand, the United States tended to restrain advanced arms transfer to the affluent allies. This results proves that the United States’ arms transfer policy was on the basis of its national interests to manage allies, not ‘idealistic charity’.