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Towards better acoustic conditions in school buildings in Korea-a need for Korean standard for classroom acoustics (국내 교육시설의 음향기준 제정의 필요성 제고)

  • Young-Ji Choi
    • The Journal of the Acoustical Society of Korea
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    • v.42 no.2
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    • pp.113-123
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    • 2023

  • This paper describes the acoustical conditions of elementary school and high school classrooms as well as university classrooms in Korea and suggests a need for Korean acoustic standards and guidelines for classroom design. Current standards and guidelines of classroom acoustics in several countries were briefly introduced to understand their acoustical performance criteria for background noise levels and reverberation times, and noise isolation design requirements in various types of classrooms. The results of several acoustic survey of domestic classrooms in elementary school, high school, and university were described and compared to provide information of the acoustic characteristics of Korean school classrooms. The survey includes occupied and unoccupied data on the acoustical conditions, noise levels, and noise isolation performance in the classrooms. Acoustical parameter values for achieving 'good' speech intelligibility in active university classrooms were also presented.

  • https://doi.org/10.7776/ASK.2023.42.2.113 인용 PDF

Noise Analysis and Reduction Methods of the All-in One Window Ventilation System (창호일체형 환기장치의 소음분석 및 저감방안)

  • Park, Chan-Jae;Haan, Chan-Hoon
    • The Journal of the Acoustical Society of Korea
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    • v.32 no.1
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    • pp.43-55
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    • 2013

  • The window ventilation system based on the heat recovery device was developed which make air ventilation possible without opening the windows. However, mechanical and aerodynamic noises were come to pass which annoyed people in rooms. In the present study, noise of new window ventilation system was measured in both general room and anechoic chamber. Also, the noise path was detected to find cause of noise generation and vulnerable area of the device. Sound absorptive and insulation materials were applied to mitigate the noise. Finally, an alternative noise control method was suggested which can satisfy with the indoor noise standards. As a result, it was shown that the cause of noise was the low transmission loss in the ventilation system. As a result, it was shown that the main noise source of the ventilation system was the blower and the major cause of noise was the low transmission loss of the ventilation system. It is also concluded that the noise levels complies with the noise standards of 40 dBA when 2 mm rubber sheet is applied inside the ventilation system.

  • https://doi.org/10.7776/ASK.2013.32.1.043 인용 PDF KSCI