• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.917-920
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• 2003

자기 부유기는 전자력을 이용해서 자성 재료를 공중에 떠있게 할 수 있는 장치이다. 자기 부유기는 근본적으로 비선형이며 불안정한 시스템으로서 제어에 많은 어려움이 따른다. 본 논문에서는 비선형 시스템을 국부적으로 선형화해서 모델링하고, 위치가변제어를 수행할 수 있도록 비례미분 위치제어기를 설계하였다. 시뮬레이션과 DSP를 이용한 자기부유기 제작 및 실험으로 위치제어 응답성능을 검증하였다.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.1134-1135
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• 2006

In this paper, dynamic simulation results for magnetically-levitated vehicles are resented. The dynamic equation and models for a half-bogie system are derived. The system includes primary suspension system, magnet module, spring-damper system and cabin. Also, the dynamic characteristics for the derived models are analysed. Using the results, levitation control algorithm can be designed to meet the performance requirements.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2043-2045
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• 2003

본 연구에서는 자기부상 방식의 스테이지 시스템 설계 및 제작을 행하고 시스템의 제어성능평가를 하고자 한다. 본 논문에서는 제어성능의 효율성을 향상시키기 위하여 부상체(Platen)의 기계적인 모델링을 행하고 Platen의 PTP(point to point) 및 궤도추종제어가 가능한 슬라이딩 모드제어기를 제안하였다. 제안한 슬라이딩 모드제어기는 모델링 오차 및 외란에 대해서도 강인한 제어성능을 얻을 수 있으며 수치시뮬레이션을 통하여 그 유용성을 확인하였다.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1051-1052
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• 2007

In this paper, as a clean lift, a maglev(magnetic levitation) clean lift is designed and described. The maglev clean lift, which is superior to conventional lifts in vibration, noise, clean class and speed characteristics, consists of magnets, guide rails, guide rollers, magnet module frame, cage, guidance controller, sensors, etc. As design specifications, the maximum value of vibration is 0.2G, the maximum value of noise is 60dB, and the clean class is #10. The design results for the maglev clean lift are shown and discussed.

• Proceedings of the Korean Magnestics Society Conference
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• 2008.12a
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• pp.224.1-224.1
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• 2008

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.51 no.12
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• pp.571-576
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• 2002

This paper is to develop jumping ring system with three sensor arrays and to control levitated ring using dynamic neural mode. Placing an aluminum ring on the core and switching on an AC source causes the ring to jump in the air due to induced currents. The educational system is composed of 40th optical sensor array, encode circuit, 89C51 microprocessor and control board. The control board consists of power IC, and phase controller. Real time process is present to obtain a height of levitated ring for three different sensor arrays. Based on the educational system and the proposed dynamic neural mode, the height of levitation of the ring is controlled by reference signals. This paper focuses on real system controls using the dynamic neural mode with on line learning algorithm.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.894-897
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• 2004

In this paper, we address a position control scheme for a stage system, which is levitated and driven by electric magnetic actuators. This consists of a levitating object (called platen) with 4 permanent magnetic linear synchronous motors in parallel. Each motor generates vertical force for suspension against gravity and propulsion force horizontally as well. This stage can generate six degrees of freedom motion by the vertical and horizontal forces. Dynamic equations of the stage system are derived based on Newton-Euler method and its special Jacobian matrix describing a relation between the Joint velocity and platen velocity is done. There are proposed two control schemes for positioning, which are Cartesian space controller and Joint space controller. The control performance of the Cartesian space controller is better than the Joint space controller in task space trajectory while the Joint space controller is simpler than the Cartesian space controller in controller realization.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10a
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• pp.1091-1097
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• 1991

A logical and systematic procedure to derive a mathematical model for magnetically levitation(maglev) systems with a combined lift and guidance is developed by using and graph. First, bond graph is constructed for the energy-feeding system with magnetic leakage flux. And, the overall maglev system in which lift and guidance dynamics are coupled is modeled by using the concept of multi-port field in bond notations. Finally, the LQG/LTR control systems are designed for single-input single-output and for multi-input multi-output maglev systems. In this paper, it has been shown that the bond graph is an excellent method for modeling multi-energy domain systems such as maglev systems and the multivariable control system is required to improve the performance of the maglev system with a combined lift and guidance.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.1533-1540
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• 2007

The most critical function of the Communication Based Train Control system is wayside and on-board Radio communication. Radio communication must be safely made without errors. The standards for CBTC has not been established yet, and research on Radio communication systems for use in Train control systems adopting CBTC system such as the magnetic levitation train must continue. This paper will discuss the characteristics of Radio communication technology currently used domestically such as GSM-R, IEEE 802.11, TETRA, MESH, and WiMAX/WiBro, and will investigate the potential possibility of applying them to Train control systems.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2199-2202
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• 2002

In this paper, a rail-vibration controller of magnetic levitation system is designed and implemented. The target plant to be controlled is electro-magnetic type which is open-loop unstable, highly non-linear and time-varying system. The designed controller is validated by some kinds of experiments.