In 2013, Imsil Pilbong Culture Village installed a dome-shaped membrane structure off a ceiling of an outdoor performance hall in order to support performances under bad climate condition. However, sound energy during the performance is collected under the dome structure and bounced back to the stage, which produces mixed acoustic which causes a serious acoustic defects. So, in this study, in order to improve the acoustical performance of the outdoor performance hall in Korea Soriter, two sound performance improvements were proposed using sound simulation according to the installation suspension absorbers after identifying acoustic defects through field measurement. The results of study, the comparison between sound performance improvement test, sound pressure level (SPL500Hz) was 64.7dB at 69.0dB, the weighted sound level (SPLdB(A)) was 68.8dB(A) at 78.7dB(A), reverberation time (RT500Hz) was 1.28sec at 2.19sec, early decay time (EDT500Hz) was 1.48sec at 2.41 sec, definition (D50,500Hz) was 52.9% at 29.8%, clarity (C80.500Hz) was 2.2dB at -l.OdB, and RASTI was 584.4%(“Fair”) at 51.1%(“Fair”) was evaluated.

Abstract
1. 서론
2. 야외공연장의 제원 및 음향성능 측정
3. 필봉문화촌 야외공연장의 음향성능 실태분석
    3.1 음압레벨(SPL, Sound Pressure Level)
    3.2 잔향시간(RT, Reverbewration Time)
    3.3 초기감쇠시간(EDT，Early Decay Time)
    3.4 음성명료도(D50, Definition)
    3.5 음악명료도(C80, Clarity)
    3.6 음성전달지수(RASTI, Rapid Speech Transmission Index)
4. 음향시물레이션을 이용한 음향성능개선안 제안
    4.1 음향 시뮬레이션의 개요
    4.2 음향 시뮬레이션의 신뢰성 검토
    4.3 음향성능 개선안 제시
    4.4 음향성능 개선안 별 음향성능 분석
5. 결론
후기
Reference

• 김재호(Integrated master’s and doctoral course of architectural engineering at Wonkwang University.) | Jae-ho Kim
• 정아영(Senior Researcher, Construction Test & Certification Department, Korea Institute of Civil Engineering and Building Technology.) | A-Yeong Jeong
• 김재수(Professor, Dept. of Architectural Engineering, Wonkwang University) | Jae-Soo Kim Corresponding author