• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.10a
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• pp.278-279
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• 2009

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.10a
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• pp.739-740
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• 2009

• The Journal of the Acoustical Society of Korea
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• v.28 no.8
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• pp.781-789
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• 2009

The absorption coefficients of the materials used in a 1:50 scale model multipurpose hall were measured based on ISO 354 and related laws. The shape and materials for the scale model were evaluated based on reflective surfaces, variable acoustic elements and sound-absorbing quality (125Hz-1kHz average) of seats. The measured average absorption coefficients of audience seats, audience and orchestra were 0.64, 0.74 and 0,45, respectively, which were simulated with the combination of wood, absorption materials and foam board. Various mounting methods for absorption curtain and banner were considered according to the installation methods. The average absorption coefficient was measured as 0.42, 0.47 and 0.45 in the conditions of Type A mounting, E mounting with 0.9 m backing air cavity, and Type G mounting which is suspended at the ceiling, respectively. It was confirmed that the absorption coefficient was increased at low frequency by backing air gap. The finishing material of stage house was an absorption material covered with thin fabric, which aimed average absorption coefficient of 0.68 by using fiber glass board. Each part of the real materials was compared with those of 1:50 scale model and it was found that the absorption characteristics of both cases were similar.

• Fire Protection Technology
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• s.51
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• pp.31-38
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• 2011

• Korean Architects
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• no.11 s.307
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• pp.56-61
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• 1994

개방화시대를 맞아 경제, 사회, 문화 등 모든 분야에 걸쳐 외국업체와의 치열한 경쟁은 피할 수 없는 현실이 되고 있다. 특히, 건축설계 분야에 있어서 개방화, 국제화의 큰 파고 속에 우리 건축설계 사무소의 업무를 외국업체에 잠식 당할지도 모른다는 현실적인 문제점만을 지적하기에 앞서, 이를 계기로 우리 건축설계사무소들의 본격적인 해외시장 진출의 전환기회로 삼으려는 적극적인 자세가 필요하다. 지피지기라고 하는 옛말이 있듯이 이번 좌담회에서는 외국업체와의 본격적인 경쟁에 앞서 우리 건축설계사무소의 현주소를 뒤돌아 보고 외국업체와의 업무범위, 설계과정, 단계별 설계범위(기본설계, 실시설계), 특별업무(단지계획, 음향, 자문)등에 대해 비교, 분석해 봄으로써 앞으로 우리 건축설계사무소들이 나아가야 할 방향을 모색해 보고자 한다.

• Journal of Korean Association for Spatial Structures
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• v.10 no.3
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• pp.75-80
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• 2010

The present study tried to provide useful data for the acoustic design of sound amplification system with measuring and analyzing subjective preference and intelligibility by varying the number of speakers and their directivity. The results suggest that the room absorption plays a key role in subjective responses of listeners and the large sound absorption of ceiling contributes to the increase of intelligibility. Also, larger number of speakers with narrow directivity improves perceived intelligibility when speakers were installed at the lower height. However, the highest degree of intelligibility and preference were obtained when speakers were installed close enough to the sound absorptive ceiling. The highest intelligibility and preference were observed when 8 to 10 speakers with the directivity of 60 degree were used.

• The Journal of the Acoustical Society of Korea
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• v.41 no.3
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• pp.302-311
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• 2022

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.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.501-504
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• 2002

본 논문에서는 최근 건축공간에 있어서 음환경에 대한 관심이 놓아지면서 학교 건축물에 있어서 강의실내의 음환경을 측정하고, 학교건축물에 대한 음환경 기준을 확립하는 데에 기초자료와 필요한 제안을 하는 것이 목적이다. 현재 음환경 기준은 단순히 소음fp밸이나 잔향 시간과 같은 단순한 물리특성만을 기준으로 하고 있다. 여기서는 강의실 내의 잔향시간, D, STI 등외 물리지표와 설문조사 등 주관적 평가를 통해 새로운 음환경 기준을 제시하려고 한다. 여기서 사용되는 물리지표로는 TSP(Time-Streched-Pulse)신호를 사용하여 잔향시간과 D(Deutlichkeit), STI(Speech Transmission index)를 산출하였다. 강의실의 화자의 위치에서 1.5m 높이에 스피커를 놓고 청취자의 위치인 여섯 점에서 무지향성 마이크로폰을 1.2m 높이에 놓고 마이크로폰으로 들어온 임펄스 응답을 측정하고, 강의실 내의 잔향시간과 D, STI를 산출하였다. 다음에 설문조사를 실시하여, 앞에서 측정한 물리지표와 설문조사를 통해 얻은 주관적 평가와의 상관관계를 파악하였다.

• The Journal of the Acoustical Society of Korea
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• v.40 no.6
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• pp.626-648
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• 2021

Domestically, demands for multi-purpose performance venues which accommodate various performance genres have increased. However, those venues have limited capability and confined to a primary performance. The present work investigated various methods for controlling the acoustics of room for required performance genres by reviewing aurally presented and published materials. The method of varying the acoustics of a space is called Variable Acoustics, and adjusted in either passive and active ways. Passive control encompasses variable absorption, variable volume, coupled volume, and canopy reflectors, where the acoustics of a room is controlled in an architectural way. Active control includes In-line, Regenerative, and Hybrid systems where the acoustics of a room is manipulated electronically. The mechanism and application of each passive control system in existing venues are reviewed and their pros and cons are discussed. Also, the concept of each active systems and product applications are looked at through literature reviews. Lastly, some considerations that need to be taken into in the planning and design stage of a multi-purpose hall using Variable Acoustics are suggested.

• Journal of KSNVE
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• v.9 no.4
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• pp.681-686
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• 1999

In a church, speech intelligibility is very important together with the reverberance for musical activities. In order to obtain the primary data of a acoustical design for churches records were refereed and churches were measured in Europe and Japan. And in the base of measurements, those were judged by subjective hearing test. As some results, it has been found that the room acoustics of churches were different in a country and the reverberation time was perferred two seconds for speech intelligibility. However, although personal deviations were admitted, more long echoes were preferred for the music.