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정경훈,박상일,강영주,위환,염동익 조선대학교 환경공해연구소 2006 環境公害硏究 Vol.19 No.1
The reason for the school noise problem located in the city is due to the fact that this noise is aroused by the development of industrial facilities that give too much importance to certain provinces and the cityward tendency of the population and so on. which is scattered nearby school, In addition, the indoor noise caused by the students themselves is loud. It damages the environment as would a loudspeaker, and the noise from the school itself compounded with the noise from outside raises a serious problem. Measure and analysis of the actual condition of this school noise shows its influence and effect on scholastic achievement. Noise can be felt through a man's sense, and it can be felt differently according to an individual's habit, and the time and place. That's why the physical amount, which is measured by a measuring instrument, can't display the grades of noise. The results of a survey show that students' attitudes toward noise and the students' psychological reactions are more apparent in those who take part in classes located in the south building, which is exposed to a large amount of noise from highway traffic. One important factor in the different degrees of school noise is that it becomes louder as one travels higher within the building. We can determine the different effects by comparing the scores of students from various classes. For instance, the scores of students who are exposed to this noise will be compared with those who are not. To survey how much the students themselves are effected by the noise in their studying atmospheres, we selected the north building, which the noise does not penetrate as readily as it would another building and where the measure of the noise amount(Leq, 10 min.). As a result, the classes' records will show the data between the areas where the amount of noise is high and those where the amount of noise is low. It is economically and actually difficult to make a countermeasure for the schools that are influenced by noise, but we should make plans to allocate flexible arrangements of classes and time tables, and to create a good environment for teachers to utilize their professionalism in their own subjects, a variety of teaching skills and the teaching techniques necessary to work with the various levels of the students.
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박상일 ( Sang Ill Park ),최형일 ( Hyung Il Choi ),정경훈 ( Kyung Hoon Cheong ),염동익 ( Dong Ick Yeom ),정원삼 ( Won Sam Jeong ),김난희 ( Nan Hee Kim ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1
Suggesting countermeasures against traffic noise, the result of modeling the noise level distribution of the apartment using RAYNOISE is as follow. l. Characteristic of Noise Level Attenuation as per Frequency of Apartment Space Comparing the difference of measured values on the balcony and in the enter of the living room had a minus value for an applicable value of 62%, which means the balcony is the path where the, sound is being passed. Because the center of the living room is a closed space, it is considered that the sound became higher by reflection and diffraction of sound in the living room. Change of frequency. Attenuation as per space in the 1st, 5th and 8th floors showed the attenuated condition becoming greater as frequency rose by 1 kHz, and it became greater on the higher floor at 31.5 Hz and 63 Hz. On the 11th floor, 63 Hz appeared to have a higher attenuated condition, and it was attenuated similarly in general. 2. Modeling Using RAYNOISE for Noise Level and Characteristics of Frequency in Apartment Space Noise levels measured on the exterior wall of the apartment, on the balcony and in the center of a living room revealed to be higher in low frequency bandwidths in the lower floors. They decreased on the higher floors including the 7th and 8th floors, increased then decreased again on the 9th floor. The noise level in the living room was 45.3 dB(Z), which appeared to be higher than that of the balcony(41.1 dB(Z)). It was also higher than the balcony in all frequency bandwidths. We then compared noise level in two cases while the window of the living room was open. The first case kept the window of balcony 2(bed room 2 directions) closed while the window of balcony 1(living room directions) remained open. The second case kept the window of balcony 1(living room directions) closed while the window of balcony 2(bed room 2 directions) remained open. The noise level in the center of the living room was 45.0 45.6 dB(Z) in the former case and 28.5 29.5 dB(Z) in the latter, thus showing the attenuated effect of f 5.9 16.6 dB(Z). The attenuated effect appeared to be 16.9 17.9 dB(A) characteristics of A.
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