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전민우 ( Min Woo Jeon ),임창우 ( Chang Woo Lim ) 충북대학교 건설기술연구소 2010 建設技術論文集 Vol.29 No.1
The decision of river width has aimed at flood control and good river conveyance. Furthermore the river width has been decided by practitioner`s subjective and emperical opinion. However, there is a need for more objective and thus quantitative decision method for decision of river width considering not only economical aspect but also social or environmental aspect. To determine the design river width in Miho stream basin, hydrologic and geographis characteristics, such as basin area, channel slope, stream length are investigated. The current equations of design width determination of small rivers are examined in this paper. The stream morphological characteristics of river basin has a close correlation with the hydrological and hydraulic characteristics of the basin. The design flood, basin area and channel slope of 23 medium rivers in Miho stream basin are collected. The design river width formulas are then determined by the least square method. Using the proposed method, It allows to prioritize various river width and make the optimal decision and this method can serve as a useful tool for river engineers in practice.
김재환(Kim, Jaehwan),임창우(Lim, Chang-Woo),홍지영(Hong, Jiyoung),정원태(Jeong, Wontae),정완섭(Cheung, Wansup),이수갑(Lee, Soogab) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
This paper continues companion paper, part I : measurement and analysis. As shown in companion Paper, information and energy in monaural signal is quite different from that of binaural signal. In this paper, difference between monaural and binaural signal of transportation noise are investigated in subjective response test. We executed hearing screening test before giving a subject response test and excluded subjects who had physical hearing loss. An annoyance response test was conducted using headphone to avoid cross-talk effect in binaural testing. Percentage of highly annoyed under binaural signal reproduction is higher than percentage of highly annoyed under monaural signal reproduction. Result implies binaural reproduction technique is proper for a study of human response to short-term noise exposure in a headphone simulated-environment.
김재환(Kim, Jaehwan),임창우(Lim, Chang-Woo),정원태(Jeong, Wontae),홍지영(Hong, Jiyoung),정완섭(Cheung, Wansup),이수갑(Lee, Soogab) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
Measurement of noise is not only to know the information of acoustic pressure but to assess human response to noise. To find human response to transportation noise through the laboratory study we have to measure and reproduce noise. The method of noise reproduction is largely divided into monaural and binaural techniques. But human fundamentally hears sound through both ears, referred as binaural hearing. Binaural signal is different from monaural signal because it includes more information of physical phenomena like acoustical reflection, diffraction and refraction. Especially head and pinna play an important role in perceiving change of signal origin. So, the amplitude of binaural signal is higher than that of monaural signal and spectrum of both signals is discriminated. Most of assessment and regulation of transportation noise are, however, based on monaural measurement techniques. The quantitative difference between monaural and binaural measurement is investigated in this study. Comparison on several transportation noisesshows defect of information in monaural measurements.