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홍윤혁(Yun H. Hong),김정태(Jeung T. Kim),김정수(Jung-Soo Kim) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Noise pollution from a high speed train has been a serious social issue nowadays. Especially when a train speed exceeds 350 km/hr, an aerodynamic noise level has been known to be increased drastically. In this paper, explained were the studies on the noise reduction and engineering approaches to estimate and analyze influences of noise. Based on this study, it is estimated to apply results to development of trains and expected to accomplish futuristic technology by devising noise prediction of high speed EMU and measures to reduce noise on a design phase.
홍윤혁(Hong, Yun-H.),김정태(Kim, Jeung-T.) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.5
Community noise has been great concerned in public. A traffic noise from a road or a railway has affected too mush damage on quiet living environment. In this paper, a measured noise signal on a street has been applied to extract a noise source and a path by using a complex cepstrum. An example shows that the waveform of the source and the path could be separated if a temporal windowing is properly applied.
홍윤혁(Hong, Yun-H.),김정태(Kim, Jeung-T.) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.3
Community noise has been great concerned in public. The traffic noise in seoul, especially has been growing awareness for the quiet living environment. In this paper, the effect on the noise barrier in order to reduce highway noise near on the street has been examined. First barriers have been evaluated at 5 locations in the city. The evaluation is performed before and after construction, with the reference point which does not affected on road traffic volume. Then, noise reducers mounted on the harriers also have been examined. the result shows that it reduces noise level by $3{\sim}3.5dB(A)$ with a standard deviation of 2.8 dB(A).