• Proceedings of the KSR Conference
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• 2006.11b
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• pp.281-287
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• 2006

Subway line becomes an important way of transportation as road traffic goes to limit. Recently the large number of passengers of the subway lines near metropolitan area, In-Cheon, Su-Won, Pyung-Teak and Chon-An, is rapidly increasing. The electric cars of the No. 1 subway line in the suburbs are now running fast compared to the downtown area. However, the fast electric car can be uncomfortable to ride in, because there are so much noise and vibration. In this research, the running characteristics of the electric car of the No. 1 subway line in the suburbs is investigated through the measurements of the noise and vibration at running condition.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.83-84
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• 2007

본 논문은 변압기 소음저감을 위하여 Active part와 외함 형상변경에 따른 연구를 수행하였다. Active part는 변압기 소음의 주 원인인 철심의 적층방법 및 적층 step수에 대해 분석하였으며, 외함의 형상을 원형으로 변경하고 충격시험 및 유한요소 해석을 통해 원형외함의 특성을 파악하였다.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1506-1508
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• 2005

VCO(voltage controlled oscillator) using mobile communication device decides direct characteristics as parts that affect important in stable oscillation and distortion characteristics of system. VCO used 900 MHz band was designed by the transformation of Colpitts circuit form use ADS that consider Q-factor to minimize phase noise. VCO manufactured together evaluation board and voltage control oscillator to FR-4 PCB. VCO experimented chracteristics after control through resonance department tuning. In our research, the designed VCO has 15.5 dBm output level at the bias condition of 6V and 10mA and the operating frequency range of 917 MHz$\sim$937 MHz band. Phase noise is -98.28 dBc/Hz at 1 MHz frequency offset from the carrier.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.04a
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• pp.256-257
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• 2012

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.04a
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• pp.345-346
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• 2011

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.881-885
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• 2007

The pure electric braking system need to be developed to stop the electric train to zero speed by electricity. This system has advantages like reduction of weight, maintenance cost, noise, and dust generated by disk friction. Therefore, we will study this system for Korean urban transit system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.04a
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• pp.163-168
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• 1996

In this paper a new dynamic damper driven by DC linear electric motor, is proposed for suppressing wide-band vibration. First, the reason for the incapability of a conventional dynamic damper to suppress wide-band vibration is explained. Then, with its defects taken into consideration, the principle of wide-band vibration control is presented. Finally, experiments ar conducted verifying the control effect of the active dynamic damper for suppressing wide-band vibration.

• Proceedings of the KIEE Conference
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• 2001.05a
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• pp.254-258
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• 2001

In this paper, 3-dimensional charge simulation method was developed to analyze electric field distributions of special conductor bundles equipped with spiral rods for reducing aeolian noise. When we applied this method to 765 kV double circuit transmission line, we found calculation error of this method was within a reasonable boundary of 1%.

• Proceedings of the KIEE Conference
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• 2001.07a
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• pp.359-361
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• 2001

In this paper, 3-dimensional charge simulation method was applied to analyze electric field distributions of special conductor bundles equipped with spiral rods for reducing aeolian noise in a corona cage. We found calculation error of this method was w a reasonable boundary of 0.5%.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.10a
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• pp.376-377
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• 2010