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오양기,한명호 한국소음진동공학회 1999 소음 진동 Vol.9 No.5
It is getting higher the demand on a good sound in a car. Like some other sensory qualities, achieving a good sound is still treated as a black-box followed by the individual taste of tuning engineers. This study aims to define the attributes of a good car audio sound and the assessment factors affecting the sound quality. With a variety of surveys on professional listening groups and car audio installers, 26 most frequently used vocabularies are selected as typical presentations of car audio sound quality. After repetitions of listening tests with deliberately selected test CD, pre-recorded 15 different digital car-recordings, headphones replay system, and three different listening groups, it is proved that there are at least 5 different assessment factors which significantly affect the car audio sound quality. They are high fidelity, spectral balance, tonal accuracy, sound stage and acoustic fault.
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방음터널 단면형상에 따른 소음저감 예측 및 특성 평가 : 터널 외부소음을 중심으로
오양기,김하근,이원열 대한건축학회 2004 대한건축학회논문집 Vol.20 No.8
Noise emitted from urban arterial roads is getting more serious problem in the environmental quality of living. Though noise barrier is one of measures to mitigate noise levels at housing area, it has a limited effect especially on apartment units high around the roads. Noise barrier tunnel may be another effective device for noise reduction even to high rise apartments. On these basis, this study aims at providing a number of possible sectional shapes of noise barrier tunnels, measuring their effects on noise reduction with 1 to 5 scale model measurements, and proposing/validating a prediction technique of their effects. According to a number of measurements with various sectional shapes or the scaled model, 1)the proposed sectional shapes have affirmative effects on noise reduction, 2)the difference in noise levels between in and out of tunnel are about 10dB whether there is opening in the ceiling or not. 3)results from predictions and the measurements show generally good agreements within 0.3∼3.6 dB(A).
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오양기,주문기,박종영,김하근,양관섭,Oh Yang-Ki,Joo Moon-Ki,Park Jong-Young,Kim Ha-Geun,Yang Kwan-Seop 한국음향학회 2006 韓國音響學會誌 Vol.25 No.2
현행 중량 바닥충격음 표준 측정방식인 KS F 2810-2에 의하면 중앙점을 포함한 3-5곳의 타격위치에 대하여 수음실에서 4곳 이상의 지점의 피크레벨을 측정하도록 되어있다. 그러나 이 표준 방식에 의한 동일 상황에서의 측정 결과가 측정기관, 측정횟수, 측정점의 위치 등에 따라 일관성을 보이지 못하고 있음이 종종 발견된다. 이러한 편차는 반복성이나 재현성의 측면에서 측정값의 신뢰도에 영향을 미칠 수 있는 수준으로 우려된다. 측정결과 실험실의 경우 중앙 타격시 63Hz 대역에서 각 지점간의 차이가 l0dB이상 차이를 보였으며, 전체적으로 중간주파수 대역에서 보다 저주파수 대역에서의 편차가 크게 발생하는 것으로 나타났다. 이러한 편차는 저주파수 대역에서의 모드 중첩현상에 의한 것으로 보인다. 현행 바닥충격음 단일지수 평가 방법에 따라 평가한 결과 측정위치에 따라 단일지수 평가값에 2-7dB의 차이를 보였으며 바닥충격음 차음성능 평가에 영향을 줄 수 있을 것으로 판단되었다. 따라서 향후 저주파 대역의 편차를 줄이거나 저음의 모드 중첩에 의한 영향을 배제할 수 있는 측정 혹은 평가 방식의 개선이 필요하다고 사료된다. Measurement of impact sound insulation of floor, by current Korean Standard KS F 2810-2. is to be made with peak levels over 4 point in a receiving room. But it is often the case that there is inconsistency in results at various receiving points in the receiving room. Such variations obviously have effects on the repeatability and reproducibility of measured data. The result shows that there are even 10 dB deviations in 63Hz octave band frequency range and relatively less variations are occurred in other low frequency ranges. Such variations seems to be coming from modal overlaps of the receiving room. According to current rating method of floor impact sound. KS F 2863-2, that may affect on the single number latins scheme. From the result of tests in this study, there are 2dB to 6dB differences in the sin91e number with the combination of measurement points. This means that the reduction of measurement variations from the microphone positions is needed for a better credibility of measurement results.
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박스형 공동주택 거실에서 중량바닥충격음 수음점 위치에 대한 적정성 연구
오양기,주문기 한국건축친환경설비학회 2019 한국건축친환경설비학회 논문집 Vol.13 No.6
In this paper, the validity of the receiving points in the heavy weight floor impact sound was investigated by measuring a room mode. Living rooms of different sizes were analyzed by grid measurement. As a result, the sound pressure level was the lowest in the 80 Hz band, which is the one half of the receiving room. It was shown that the fixed microphone position was likely to cause different result by the room mode. The result was the same according to the size of the receiving room. As shown in ISO 16283-2, it was expected that the 4 points of the receiving room would be avoided center points, corners, and nearby walls. Also, the point at which receiving point on the same plane is symmetrical was shown to be avoided. Through this measurements, the minimum guidelines for the receiving points were proposed when measuring the heavy weight impact sound.
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大形講議室의 建築設計에 관한 硏究 : 光州大學校 大形講議室의 音響改修를 中心으로
吳洋基,金承眞 광주대학교 1990 論文集 Vol.7 No.-
This study deals with the architectural and acoustical requirements of large lecture rooms, In practice, there are many cases in building such roomss without any acoustic considerations, In the study, the practical method which ensure a better acoustic quality for the rooms of poor speech communication quality is introduced. The method is consist of some modifications which is concerned the total absorption capability and the background noise level, in precise, the signal-to-noise ratio. The modification performed in the large lecture room of Kwangju University shows that the method is very useful to acquire better acoustic condition.
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오양기,Oh, Yang Ki 한국음향학회 2022 韓國音響學會誌 Vol.41 No.3
Sound barrier walls are one of the most effective alternatives for reducing environmental noise on roads and railways in the city center. The insertion loss of the sound barrier against road traffic noise is the sum of the sound transmission loss, sound absorption loss, and sound energy reduction due to the diffraction attenuation of the sound barrier. The sound transmission loss of the sound barrier is one of the important factors that determine the insertion loss of the sound barrier and is a basic indicator that determines the performance of the sound barrier. Nevertheless, there is not a separate standard in Korea for measuring the acoustic transmission loss of sound barrier panels. There are only a few conditions in KS F 4770 series that stipulates on the general material of sound barrier panels. This thesis examines the necessity of the acoustic transmission loss measurement and evaluation standards of sound barrier walls, and seeks a measurement method in a free sound field (anechoic chamber) sound receiving room considering the characteristics of sound barrier walls installed in external spaces, unlike indoor building materials. In addition, a single number evaluation method using a reference spectrum was proposed so that the sound insulation effect according to various installation places such as roadside or railroad side can be easily displayed.
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