• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.07b
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• pp.678-681
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• 2002

In this paper, Characterization for several 3-D embedded passive elements with different structures was performed. The equivalent circuit optimization for embedded inductor was performed by HSPICE simulation software. After extracting each parameter values, the difference of parameter from each structure was examined. From this work, effective characterization of passive devices with similar structure will be possible.

• Journal of the Korean Institute of Telematics and Electronics
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• v.14 no.3
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• pp.6-11
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• 1977

The noise behavior of the Schottky Barrier Gate FET has been investigated by the use of noise equivalent circuit. It has been found that an additional noise source has to be taken into account in the GaAs SBGFET's biased in the pinch-off region; the intervalley scattering noise and the hot electron noise. In this paper, a noise equivalent circuit has been used to determine the noise parameter which was taken into account influence of the saturation velocity of carrier and parasitic resistance.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1117-1119
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• 2005

The inductance is an important parameter in order to analyze steady state of LSRM(Line-start Synchronous Reluctance Motor). If FEM(Finite Element Method) is used to compute the parameter according to the change of flux barriers and conductor bars, less analysis time is required. Therefore, this paper adopts equivalent magnetic circuit method to simply calculates inductance, and the result is verified by comparing with the results by FEM.

• Journal of the Korean Institute of Telematics and Electronics
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• v.11 no.6
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• pp.16-24
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• 1974

In this paper the method of constructing short and open stable voltage inversion negative immittance converter (VNIC) circuits is proposed according to simplified equivalent models witch consist of a parameter control circuit, and a voltage or a current control circuit. VNIC characteristics can be obtained as gate voltage of common gate connection is controlled by the output of the parameter control circuit corresponding to its input. Constructed circuits are analysed, and the experimental results are compared and cheeked with the calculated results. Errors are found less than 11%. Oscillation behavior of constructed VNIC oscillator is compared with that of negative resistance oscillator.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.941-942
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• 2011

A thermal equivalent circuit of IPMSM considering eddy current loss of PM and core loss of rotor is proposed. This thermal equivalent model is represented by the thermal resistances and thermal capacitances. In order to determine the factor of each parameter, a heating test is processed. Additionally, the eddy current loss of PM is calculated by a transient 3D finite element analysis. Finally, this thermal equivalent model is verified by a temperature test in a 25kW 12-pole/18-slot IPMSM with varying load.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.1077-1078
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• 2006

This paper presents circuit model of catenery in electrified railway system. Most of (a.c.)electrified railway system adopted as AT fed power supply system. This system is fed with twice voltage. It is that AT system can be fed through longer distance. Conventional circuit model of catenary is used T equivalent circuit with lumped parameter. This model may include some problem when traction power supply system is analyzed. In addition, the model with distributed parameter is good for analysis of harmonic and EMI.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1171-1172
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• 2007

This Paper presents circuit model of catenery in electrified railway system. Most of (a.c.)electrified railway system adopted as AT fed power supply system. This system is fed with twice voltage. It is that AT system can be fed through longer distance. Conventional circuit model of catenary is used T equivalent circuit with lumped parameter. This model may include some problem when traction power supply system is analyzed. In addition, the model with distributed parameter is good for analysis of harmonic and EMI

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.11B no.2
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• pp.15-21
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• 2001

This paper presents an improved characteristic analysis methodology for a 5-phase hybrid stepping motor. The basic approach is based on the use of equivalent magnetic circuit taking into account the localized saturation throughout the hybrid stepping motor. The finite element method(FEM) is used to generate the magnetic circuit parameters for the complex stator and rotor teeth and airgap considering the saturation effects in tooth and poles. In addition, the neural network is used to map a change of parameters and predicts their approximation. Therefore, the proposed method efficiently improves the accuracy of analysis by using the parameter characterizing localized saturation effects and reduces the computational time by using the neural network. An improved circuit model of 5-phase hybrid stepping motor is presented and its application is provided to demonstrate the effectiveness of the proposed method.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.8
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• pp.1195-1202
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• 2010

When modelling lots of induction motors to design and configure an engine room simulator, the 2 parameters equivalent circuit has many practical benefits as it reduces working hours considerably without requiring complicated technical data from makers except the ratings of motors. The basic properties such as torque and load current are shown well matched with real cases by this method, but almost the only drawback of 2 parameters circuit is that it reveals inherently higher power factor in the whole operation range due to disregarding the exciting current of the induction motor to maximize the simplification. This paper suggests a modelling module as a practical tool to compensate the power factor by inserting a virtual compensation current into the load current from 2 parameters equivalent circuit, and the simulated results show satisfactory outputs and the improved power factor indication by performance curves when compared to the cases of 2 parameters-equivalent circuit.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.393-396
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• 2000

Repeater Duplexer of 800MHz band consists of 4pole transmitter band pass filter, receiver band pass filter and branch circuit. Circuit parameter of Duplexer such as coupled capacitance of equivalent circuit was drawn out and used to coupled line characteristics impedance (Zoo, Zoe) that satisfied resonator condition and attenuation condition. Simulation was carried out by the ADS(Advanced Design System) were obtained good attenuation characteristics (869~894MHz： 65㏈(Min.),824~349MHz： 65㏈(Min.)