• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.504-507
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• 2005

This paper presents a self-levelling system for a mass, which undergoes a severe acceleration, with integrated displacement feedback control. After a general description of such a system, theoretical analysis is investigated to design an active control device. That is, the self levelling system is used to reduce the 'static' deflections while isolating the 'dynamic' vibration. A computer simulation model of 45 kg with two air spring mounts is considered to predict the performance of the control system. The results showed the controller can reduce the mass's displacement to the level of 1/3-1/5. Thus the self-levelling system can be applied usefully to reduce the dispalcement of a mass which experiences a high g dynamics.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.23 no.1
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• pp.54-60
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• 2011

Procedures for estimation of insulation thickness for a horizontal pipe for condensation control or personnel protection has been investigated, parallel to the previous work of a vertical wall case. Parameters include pipe diameter, emissivity, thermal conductivity, and operating temperatures. The results indicated that the surface emissivity plays a very important role in the design of insulation, specially for the case of high temperature application with low Bi. The effect of surface radiation in such case could be up to 65% of the total. Required insulation thickness for the surface temperature control increases as pipe diameter increases and as surface emissivity decreases. Adequate revision of specifications or standards to include newly invented insulation materials with high emissivity has been also suggested.

• Proceedings of the Materials Research Society of Korea Conference
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• 2011.05a
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• pp.18.1-18.1
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• 2011

가공용 마그네슘합금 중간재를 저비용으로 제조하는 공정기술의 하나인 수평연속주공정을 통해 판재 및 빌렛을 제조하는 공정에 대한 연구결과를 소개하고자 한다. 수평연속주조공정은 기존의 반연속주조공정에 비해 저비용 공정이며, 실용화 초기단계에 있는 제조공정인 strip casting으로는 제조가 불가능한 고합금계의 마그네슘 중간재를 제조할 수 있는 공정기술이다. 또한 연속주조한 빌렛의 압출공정에서 압출속도를 향상시킴으로써 미세조직을 제어하고 제조 비용을 절감하기 위한 연구로서 고속압출용 신합금 설계기술과 압출공정제어에 대한 연구결과를 소개하고자 한다.

• Journal of Power System Engineering
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• v.8 no.4
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• pp.17-23
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• 2004

A delivery ship is used to handle the cargo with the crane to/from the ships. The ship is inclined in the direction of a cargo which is hung on a crane. In this case, a arc shaped rail should be in the equilibrium state to get good anti rolling performance. In this study, a device and control algorithm are developed to take accurate and quick equilibrium of the rail. The device is composed of a hinged immovable support and two screw jacks. And the control algorithm demands two controllers. One controller is designed such that the screw jack 1 and 2 follow the position reference signal generated by a tilt sensor. The other controller of two degree of freedom is designed to remove the synchronous error occurred between jack 1 and jack 2. The simulation results show that the desirable control performance is achieved.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.10a
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• pp.438-439
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• 2011

Magnetic levitation control system of a metal ball was designed using combined PID and fuzzy logic, in which two electromagnets are used to control the vertical and horizontal position of the ball. Single synchronization coil sensor was used to detect the vertical position. Electric power is differentially supplied to two electromagnets so that the ball can move horizontally. In the experiment 25 cm diameter metal ball was levitated and successfully controlled to move horizontally.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.131-132
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• 2016

우리는 많은 소형 무인비행체들이 운행될 곧 다가올 미래에 대비하여 무인비행체들 간의 충돌 예방을 할 수 있는 방안에 대하여 연구를 진행하고 있다. 본 논문에서는 높은 밀집도를 가지는 소형 무인 비행체들 간의 충돌을 회피하기 위하여 무인비행체의 성능에 따라 클래스를 부여하고 비행 고도를 지정해주고 지정된 고도 내에서는 수평 비행을 하고 클래스간 이동을 위해서는 몇개의 정해진 지점에서만 수직 비행이 가능하도록 하는 제어 방안을 논하였다.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.403-406
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• 1996

In this paper, the geometry between horizontal and vertical movement of lens is studied for automatic vergence control of horizontal moving axis stereo camera. When the disparity of stereo remains contant, the horizontal movement of camera lens for image disparity and the vertical movement for image focus have linear geometry. Using this linearity, we can control the vergence of stereo camera only by focusing of stereo camera lens.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1327-1328
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• 2015

본 논문에서는 스틱 모델을 사용하여 외바퀴 로봇의 수직 방향에서 생기는 파라메트릭 진동을 시뮬레이션 분석하고, 분석된 결과를 바탕으로 제어 법칙을 유도한 다음, 실험을 통해 성능을 검증한다. 실험에 활용된 외바퀴 로봇은 수평 방향에 대해서는 비례미분제어기를 사용하고, 수직 방향에 대해서는 진동제어기를 활용한다.

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.467-468
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• 2006

• Korean Journal of Optics and Photonics
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• v.17 no.6
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• pp.537-543
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• 2006

A method of estimating the distance using single zoom camera limits a distance range(only optical axis) in field of view. So, in this paper, we propose a method of estimating the distance information in Stereoscopic display using the stereo zoom lens module for estimating the distance in the wide range. The binocular stereo zoom lens system is composed using a horizontal moving camera module. The left and right images are acquired in polarized stereo monitor for getting the conversion and estimating a distance. The error distance is under 10mm which has difference between optically a traced distance and an estimated distance in left and right range $(0mm{\sim}500mm)$ at center. This presents the system using a function of the zoom and conversion has more precise distance information than that of conversion control. Also, a method of estimating a distance from horizontal moving camera is more precise value than that from toe-in camera by comparing the error distance of the two camera methods.