• Journal of the Korean Institute of Telematics and Electronics A
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• v.31A no.2
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• pp.53-59
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• 1994

The characteristics of the shielded suspended substrate strip transmission line(SSSL) are analyzed by the point matching method and the variational method in Quasi-TEM mode. The accuracy of this solution is confirmed by analyzing and comparing this solution with the empirical solution obtained from the same dimension. The characteristic impedance and the effective dielectric constant are also studied by increasing the air-layer height of SSSL.

• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.121-123
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• 1988

For the high speed drive of induction machine, Thyristor inverter utilizing line and device commutation is proposed. By investigating the load commutation conditions, the possible area of commutation is clearly shown. And from the above results, starting method under the constant slip frequency, is suggested.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2851-2854
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• 2003

The purpose of this paper was to find out the stabilized and effective value of RC-parameter by using PSpice simulation, considering that gate signal voltage can be distorted by RC-delay of signal line. the results of this study were as follows: TFT-LCD with high quality resolution increased the number of gate signal line and this made TFT on-time shorter over-width of signal line to improve the performance of TFT made the electrostatic capacity increase and the time constant higher, making problems and errors. and owing to the decrease of the aperture ratio, an electro optic character of LCD, we must consider the capacity and the condition of production process in deciding the width and the thickness of the gate signal line.

• Proceedings of the KIEE Conference
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• 2006.04b
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• pp.185-187
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• 2006

The line-start permanent magnet synchronous motor has a high efficiency and an advantage in constant speed operation regardless of the effect of load variation. However it is difficult to predict the performance of characteristics accurately, because of the unbalanced starting torque with the initial starting position of the rotor and the generation of a break torque. In this paper the dynamic characteristics of the line-start permanent magnet synchronous motor are described and compared with those of the squirrel-cage induction motor through the simulation to find the characteristics of the permanent magnets and the rotor bars in the line-start permanent magnet synchronous motor.

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.11
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• pp.3075-3083
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• 1994

The applications of the electrical transmission line theory to the pressure propagation characteristics in the volume loaded fluid transmission line with step and impulse input wave is demonstrated in this paper. The method is based on the premise that the time response is the inverse Fourier transform of frequency spectrum of the wave which spectrum is a product of frequency spectrum of input pressure wave and system transfer function. The frequency response and transient response of step and impulse input wave in the volume loaded fluid transmission line is analysed by the Laplace transform and inverse Laplace transform with FFT numerical algorithm. The numerical solution of the distributed friction model is compared with the average friction model and the infinite product model. And the result is showed that FFT method may have major advantages for the simulation of fluid circuitary.

• 제어로봇시스템학회:학술대회논문집
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• 1996.10b
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• pp.1237-1240
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• 1996

This paper proposes a heuristic algorithm for performing the line balancing of PCB assembly fine including multiple surface mounters efficiently. We consider a PCB assembly line including the multiple surface mounters arranged serially as a target system. We assume that the number of heads of surface mounters can be changed. Also, the conveyor is assumed to move at a constant speed and have no buffer. Considering the minimum number of machines required for the desired production rate is a discrete nonincreasing function which is inversely proportional to the cycle time, we propose an optimization algorithm for line balancing by using the binary search method. Also we propose an head-changing algorithm. The algorithms are validated through the computer simulation.

• Journal of electromagnetic engineering and science
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• v.9 no.4
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• pp.175-181
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• 2009

The measurements were performed to verify experimentally that the voltage arising on a telecommunication line by a power line is due to the induction phenomena because there has been an opinion that the arising voltage on a telecommunication line is not by induction, but by other causality. The voltage appeared on the telecommunication line by way of an electric field or magnetic field generated by the source apparatus that had been artificially made to provide intentional constant high-voltage or current in ELF, that is, 60 Hz as an emulated commercial power.

• Journal of the Korean Institute of Telematics and Electronics
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• v.7 no.2
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• pp.13-20
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• 1970

The dispersion characteristics of tape meander line were analyzed by electromagnetic field theory. The several different tape meander lines were photoetched on copper printed-bakelit substrate, and these tape meander line structures were inserted into the X-band waveguide. Phase bridge method was used for the dispersion characteristics measurement of meanderline. The measured. results were plotted on diagram(Brillouin diagram) and compared with theoretical values. Measured results were consistent with theoretical Values. But, on the measured diagram, passband midfrequency was lower than theoretical value. It was believed that the discrepancy was due to the backelite loading. The group velocity of stagger tuned meander line was higher than that of uniform meander live, and the freqnency band of constant group velocity of stagger tuned meanderline was sider than that of uniform meander line.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.29 no.8
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• pp.23-31
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• 2015

This paper proposes an advanced distance relaying based on the DC offset removal filter to minimize the effects of DC offset on a double circuit transmission line. The proposed DC offset removal filter uses only one cycle of data for phasor extraction computation, which does not need to preset the time constant of the DC offset component. This proposed distance relaying uses not only the residual current of the faulted circuit but also mutual current of the healthy adjacent circuit. A series of off-line test results using ATP simulation data show the effectiveness of the an advanced distance relaying.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.86-88
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• 2005

The line-start permanent magnet synchronous motor has a high efficiency and an advantage in constant speed operation regardless of the effect of load variation. However it is difficult to predict the performance of characteristics accurately, because of the unbalanced starting torque with the initial starting position of the rotor and the generation of a break torque. In this paper the dynamic characteristics of the line-start permanent magnet synchronous motor arc described and compared with those of the squirrel-cage induction motor through the simulation to find the characteristics of the permanent magnets and the rotor bars in the line-start permanent magnet synchronous motor.