[논문]초등학교 저학년 교실의 실내음향성능 실태조사

조아현; 박찬재; 한찬훈

doi:10.7859/kief.2021.28.3.001

초등학교 저학년 교실의 실내음향성능 실태조사
Investigation of the Acoustic Performance of Lower Grade Elementary School Classrooms 원문보기

커뮤니티교육시설 : 한국교육시설학회논문집 = Community Education Facilities, v.28 no.3, 2021년, pp.3 - 14

조아현 (Dept. of Architectural Engineering, Chungbuk National Univ.) , 박찬재 (Dept. of Architectural Engineering, Chungbuk National Univ.) , 한찬훈 (Dept. of Architectural Engineering, Chungbuk National Univ.)

Abstract ▼ AI-Helper

Speech information of teachers is transmitted to students in classrooms so that appropriate aural environment should be provided for academic purposes. Many researches have been undertaken for classroom acoustics, and acoustic standards of domestic classrooms were suggested based on the reverberation time and background noise level. However, these standards are suitable for middle and high schools and so not consider the auditory ability by ages. As a precedent research, the present study was begun to suggest an acoustic standard for lower grade elementary school classrooms with children under age 9 who have not normal auditory ability. In order to do this, acoustic performances of the lower grade classrooms were measured and compared with the general classrooms. Also, change of acoustic parameters depending on the desk layout was measured and analyzed. The measured acoustic parameters were background noise, signal to noise ratio, RT, STI, D50, and IACC. As a result, it was found that background noise is exceed the standard of 35dB(A) at the schools along the road sides. Also, it was shown that most of acoustic parameters are higher in the classrooms built recently rather than the old classrooms. Generally, there are not much difference of acoustic parameters among the various desk layouts but, better acoustic performances are acquired at the center line and the seats near sound source. Also, Higher IACC was measured at the seats on the center line facing the source squarely.

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표/그림 (20)

표 Table 1. The acoustic performance standards for the classroom in USA (unoccupied).^[4]
표 Table 2. The acoustic performance standards for the classroom in UK (unoccupied).^[5]
표 Table 3. The suggested acoustic performance stan-dards for the classroom in Korea (unoccupied).^[7]
표 Table 4. Construction type of school and architectural dimensions of the classrooms used in the present work
표 Table 5. Classroom internal materials
그림 Figure 2. Setup of acoustic parameter measurement devices
그림 Figure 1. Sound source and receiving positions of 4types of arrangements
그림 Figure 3. Comparison of background noise level results in the classrooms by school (unoccupied)
그림 Figure 4. Comparison of signal-to-noise ratio in the classrooms by school (unoccupied)
그림 Figure 5. Comparison of reverberation time (T₃₀) in the classrooms by school
그림 Figure 6. Comparison of definition (D₅₀) in the classrooms by school
그림 Figure 7. Comparison of speech transmission Index in the classrooms by school
그림 Figure 8. Comparison of sound pressure level measurement results according to desk arrangement
그림 Figure 10. Comparison of reverberation time (T₃₀) measurement results according to desk arrangement
그림 Figure 9. Comparison of signal-to-noise ratio measurement results according to desk arrangement
그림 Figure 11. Comparison of definition (D₅₀) measurement results according to desk arrangement
그림 Figure 12. Comparison of speech intelligibiity index (STI) measurement results according to desk arrangement
그림 Figure 13. Receiving positions of each arrangement of desk lay-out
그림 Figure 14. Comparison of IACC measurement results according to desk arrangement
그림 Figure 15. Average of IACC in each arrangement

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