• The Transactions of the Korean Institute of Electrical Engineers
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• v.38 no.3
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• pp.166-172
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• 1989

The model reference adaptive control algorithm (MRAC), which is one of the methods for controlling the speed of a permanent magnet synchronous motor (PMSM), has been developed using the autoregressive (ARMAX) method. Applying this algorithm to a microprocessor which is used in driving PMSM with PI controller, it has been proved that the response speed of the reference input follows closely that of the reference model. It has also been proved by experiments that the quick speed response without over-shoot could be obtained for the motor system with variable parameters.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11a
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• pp.101-103
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• 2001

Suspension effect has been studied by using superconductor of BiPbSrCaCuO ceramics containing Ag$_2$O It has been cleared that Ag$_2$O acts as pinning center which plays an important role to the suspension effect. Magnetic repulsive force which affects a superconductor located in magnetic flux from toroidal magnet has been investigated. It has been concluded that the suspension effect arises from the interaction between the pinning effect and the diamagnetic effect.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1997.11a
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• pp.489-492
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• 1997

Partial discharge characteristics of normal butyl acrylate grafted low density polyethylenes were investigated by an ultrasonic sensor made of ceramic piezoelectric material. It was found that the partial discharging activities in normal butyl acrylate grafted low density polyethylenes were considerably suppressed compared to those in plain low density polyethylene. It was found that acrylic acid grafted polyethylene was more effective than normal butyl acrylate grafted low density polyethylene.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.05a
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• pp.68-72
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• 2002

Power steering of a car plays a role that reduce driver's handle control power. Lately, it is operated using oil pressure by most engine power. However, it is tendency that electrically power steering (EPS) is used recently instead of oil pressure type more for environmental and economical reason. In this paper is SRM designed and analyzed for EPS application.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1039-1041
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• 2003

There are many advantages of the Magnetic Bearing system, compared with conventional contacting bearing systems. Since the spindle in the Magnetic Bearing system is levitated by electro-magnetic forces and rotates without mechanical friction, it can run without lubrication. So, it can run in the extreme circumstances, e.g. a vacuum condition in the space.

• Proceedings of the KIEE Conference
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• 2004.11a
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• pp.33-35
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• 2004

The size of a PLS 300w's lighting source is smaller than the size of other's. It makes the reflector design of pls 300w more efficient. We designed it and analyzed the result of the reflector design in this paper.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.125-126
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• 2007

This paper presents a CHP Heat Exchange Mechanism considering Economic Load Dispatch with Dynamic Programming. It calculates CHP heat generation cost and Heat load pattern. Also It presents CHP optimal operation through appliance of Heat Exchange Mechanism and investigates CHP optimal operation effects about connected two regions.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2003.11a
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• pp.3-8
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• 2003

Platforms of many railroad stations are crowded with passengers regardless of the time throughout day. But the intensity of illumination of the existing lightening systems are so low enough to make passengers feel inconvenience in using platforms. Consequently there exists high possibility of accidents in platforms of low illumination. Hence, for the safety and convenience of passengers, it is necessary to improve the luminous intensity of lightening system for platforms. This paper points out the problems of existing system and presents the method to improve it.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.1035-1037
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• 1993

Thermo motor that uses driving part as heating part is different from general fan heater. As it uses energy that drives rotor and generate heat at the same coil, it is simpler and cheaper than general fan heater. In this study, shaded-pole motor was used that is low cost and simple in spite of low efficiency.

• Proceedings of the KIEE Conference
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• 1985.07a
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• pp.341-343
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• 1985

In designing the high frequency oscillator with FET, it may be necessary to make the FFT unstable using feedback. For convenient realization, sir feedback type is usually employed. It is convenient to determine the load which makes oscillation possible, with the contour plot of the negative resistance of the FET positively feedback for each type. Analytic formulas are given for this contour plot in this paper, and the results are discussed.