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주문기,전호민,정진연,오양기 대한건축학회지회연합회 2013 대한건축학회연합논문집 Vol.15 No.1
방음판 흡음률 규정의 경우 250㎐, 500㎐, 1㎑, 2㎑m이 평균흡음률이 70% 이상이면 이를 만족시키는 것으로 규정되어 있다. 방음판 측정결과 특정 주파수 대역에서의 흡음률이 아주 높을 경우 다른 대역의 흡음률이 아주 작게 나타나더라도 70%를 만족하면 되는 것으로 나타났다. 그리고 도로교통소음 실측과 선행연구를 통해 대형차의 소음레벨이 저주파 대역에서 집중되어 있고 특히 250㎐대역이 80㏈(A)를 상회하며 125 ㎐대역에서의 소음레벨도 65-68㏈(A)로 나타나 각각의 주파수 대역의 최저 흡음률과 저음을 고려한 흡음률 규정이 필요할 것으로 판단되었다.
중량 바닥충격음 측정의 신뢰성 향상을 위한 측정방법 검토
주문기,박종영,양관섭,오양기,Joo, Moon-Ki,Park, Jong-Young,Yang, Kwan-Seop,Oh, Yang-Ki 한국음향학회 2008 韓國音響學會誌 Vol.27 No.4
대부분의 바닥충격음측정은 반사성 재질로 마감된, 가구도 커튼도 없는 수 미터 치수의 장방형 공실에서 이루어진다. 이러한 공간에서 저주파 모드의 발생을 피하는 일은 쉽지 않다. 현재의 측정표준에 따른 중량 바닥충격음 측정의 재현성과 신뢰성을 저해하는 가장 큰 요인은 이러한 저주파 모드 중첩 현상이며, 그 측정의 편차는 63Hz 대역에서 때론 10dB에 이르는 경우도 있다. 이 연구에서는 중량바닥충격음 측정의 편차원인인 저주파 대역 모드중첩의 영향을 줄일 수 있는 보다 신뢰성 있는 측정방법을 찾고자 하였다. 그 방법으로 수음실의 모드 중첩 현상 자체를 제어하는 방법과 어느 정도 모드가 존재하는 상황에서도 수음실 공간 전체의 음압레벨 평균에 가깝게 측정할 수 있는 방법의 두 가지에 대하여 실험하였다. 실험의 결과 저음흡음재 보다 베이스 트랩을 이용하여 수음실의 울림을 줄이는 방식은 수음실의 모드중첩을 제어하는 데는 효과가 있지만 현실적으로 다양한 측정 현장에서 저음 잔향시간을 $1{\sim}2$ 초 사이로 구현하는 일이 쉽지 않음이 단점으로 드러났다. 마이크로폰을 회전시키면서 공간적 평균을 구하는 방식은 측정이 복잡하지도 않으며 쉽게 많은 수음점을 확보하여 수음실 전체 공간을 통한 측정값과 근소한 오차를 보이는 것으로 밝혀졌다. Most of receiving rooms for the measurement of floor impact sound have rectangular shapes with couple of meters of dimension, with reflective finishing, no furniture, no curtains. Modal overlaps in those condition are the major reason for the low reproducibility, and as a matter of course, the low credibility. It is the major purpose of this study that searching for a better measurement method which mitigate the effect of modal overlap on measurement. Two ways of methods are tested. One is the way described in ISO standards which enables controlling the room modes of receiving rooms, the other is the way which enables to get more precise spatial averages in receiving rooms with room modes. It is not easy maintaining the reverberation time of low frequency bands in the range between 1s and 2s, though it is proven to be effective controlling the room modes with base traps. Space-time average SPL's through combinations of rotating microphones are easy to measure, and have good consistencies with average SPL of entire receiving room.
교실내 흡음성능과 스피커 음압레벨에 따른 청취환경 변화
주문기(Joo, Mun-Ki),오양기(Oh, Yang-Ki) 한국건축친환경설비학회 2014 한국건축친환경설비학회 논문집 Vol.8 No.6
It is often the case that various kinds of language listening tests are held in high school classrooms. Absorption material and loudness of speakers are the major variable factor of listening environment in the classroom. The absorption material in the classroom may influence the listening environment. So in this study, acoustical measurements were carried out in the classroom. According to the increase of absorption material and number of speakers, D50 value increases in all receiving point. And 0.1-0.13 D50 value was increased by attach the absorption material at both side wall. As the sound pressure level increased, so did the D50 value in all receiving point. But sound pressure level reach the certain limitation, D50 value was decreased.
주문기(Joo, Mun-Ki),고효인(Ko Hyo-In),홍지영(Hong Ji-Young),오양기(Oh Yang-Ki) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.3
In recently, numbers of civil appeal about railroad noise are growing due to the deterioration railroad noise barrier walls. The regulation of sound barrier wall used sound absorption coefficient of sound proof panels must apply the average of sound absorption coefficient in four frequency ranges (250,500,1000,2000㎐). In the measurement , the regulation of sound absorption coefficient is satisfactory when the average value of sound absorption coefficient is over 0.7. However after installation of noise barrier wall, it isn"t know whether the performances of noise barrier walls are good or bad because of being not a management regulation of noise barrier wall. So in this study, the measurements of sound absorption coefficient and investigate on the present condition of noise barrier walls were carried out in the field and laboratory. As the results, the number of problem on the noise barrier wall were found out. According to the deterioration, a damaged part and bending problem and crack and deterioration of sound absorption material has appeared in the noise barrier wall. Particularly sound absorption coefficient of over 1㎑ frequency ranges were measured 0.8-0.52. It seemed to be clogged with the dust in the absorption material. So it is expected that the management regulation of railroad noise barrier wall is needed.
주문기(Joo Mun Ki),오양기(Oh Yang Ki) 한국건축친환경설비학회 2012 한국건축친환경설비학회 학술발표대회 논문집 Vol.2012 No.10
It is often the case that various kinds of language listening tests are held in high school classrooms. Noise sources of air conditioner and fan are the major variable factor of listening environment in the classroom. The noise sources occurred in the classroom may influence the listening environment. So in this study, acoustical measurements were carried out in the two different classroom. According to the noise sources, the D50 value had a little change in the low frequency ranges. But these results appear to have little influence on the STI value.
학교교실에서 스피커의 위치 및 출력변화에 따른 청취환경 변화에 관한 연구
주문기(Joo, Mun-Ki),오양기(Oh, Yang-Ki) 한국건축친환경설비학회 2011 한국건축친환경설비학회 논문집 Vol.5 No.4
It is often the case that various kinds of language listening tests are held in high school classrooms. The condition of listening environments may influence the test. Currently, high school classrooms have a variety of listening environments. Size of classrooms, location and performance of loudspeakers, doors and windows location which may affect the background noise level, reverberation are the part of the factors which affect the listening environment. Among those conditions, the change of listening environment according to the positions, power and number of speakers are studied in this study. The results show that ceiling four speakers uniformly installed are more narrow deviations in STI value than that of one speakers. And the directivity of speakers are more effective to improve the listening environment than change the speakers power.