• Proceedings of the Optical Society of Korea Conference
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• 2008.02a
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• pp.73-74
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• 2008

• Proceedings of the Materials Research Society of Korea Conference
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• 2000.11a
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• pp.54-54
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• 2000

• Bulletin of the Korean Space Science Society
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• 2007.10a
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• pp.40.1-40.1
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• 2007

• Proceedings of the Korean Ceranic Society Conference
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• 2002.10a
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• pp.137.2-137
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• 2002

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.10a
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• pp.166.1-166
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• 2003

• 한국항공운항학회:학술대회논문집
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• 2004.11a
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• pp.285-288
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• 2004

• The tire
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• s.115
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• pp.47-51
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• 1984

80년대에 들어와서 타이어 기업은 국제적인 재편에 피치를 올리고 있다. Dunlop/Pirelli 연합의 해체 및 Dunlop의 유럽 타이어 사업부문의 매각 등을 비롯한 Michelin의 대폭적자 등 여러가지 현상이 나타나고 있다. 본지에서는 세계 주요 타이어 메이커의 현상과 앞으로의 동향에 대해서 「Fortune Ranking」을 토대로 분석해 보고자 한다.<편집자 주>

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.7
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• pp.95-102
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• 2016

Geomagnetic sensors are widely utilized for sensing heading direction of quadrotors. However, measurement from a geomagnetic sensor is easily corrupted by environmental magnetic field interference and roll/pitch directional motion. In this paper, a measurement method of a quadrotor heading direction is proposed for application to yaw attitude control. In order to eliminate roll/pitch directional motion effect, the geomagnetic sensor data is compensated using the roll/pitch angles measured for stabilization control. In addition, yaw-directional angular velocity data from a gyroscope sensor is fused with the geomagnetic sensor data using a complementary filter which is a simple and intuitive sensor fusion method. The proposed method is applied to experiments, and the results are presented to prove validity and effectiveness of the proposed method.

• The Journal of the Acoustical Society of Korea
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• v.24 no.7
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• pp.402-409
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• 2005

In this paper. we propose a coding method using a matching pursuit algorithm in a strongly periodic highband signal. Also. we propose an efficient quantizer for the estimated parameters : spectral magnitude and phase. Based on the error concealment principle and sinusoidal model. the MP algorithm requires the high-precision pitch period estimation. To estimate more accurate pitch period. the refined pitch obtained from lowband speech is used. which increases the efficiency of bit allocation. The spectral magnitude parameters are quantized by the method which is combined with MDCT (Modified Discrete Cosine Transform) and multi-stage structure. The spectral phase quantizer uses the $2{\pi}$ modular characteristic of phases and the weighted function by spectral magnitudes. To evaluate the efficiency of the proposed method. we applied it to analysis-by-synthesis system. Furthermore we suggest the possibillity of scalable wideband speech codecs based on band-split structure.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.40 no.4
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• pp.393-400
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• 2020

Axial and lateral behavior of helical piles is generally influenced by number, diameter, helix pitch, and locations of helices. In this study, axial and horizontal behavior of helical piles with three helices was investigated varying helices' locations, diameter, and pitch. Especially, due to the spiral shapes of helices, the effect of lateral load directions at pile heads on their lateral behavior was investigated. Axial load test of small-scale helical pile was conducted in laboratory, and its results were compared with numerical analysis results of the same model for cross check of validity of both results. Furthermore, diverse numerical analyses were performed for different shapes of helical piles. Consequently, it was found that, for the given analysis conditions, the helix diameter was the most influential factor on the horizontal and vertical behavior of helical piles.