• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.371-376
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• 2005

For the reduction and efficient management of railway noise, first of all prediction of railway noise is necessarily requisited. Many studies for prediction of railway nearby noise have been accomplished. But it is impossible to predict easily and exactly for the Korean Railway, because the acoustic powers for each rolling stock operated in Korea have not been built yet. So in this study, prediction model equation for environmental noise for Korean rolling stock Saemaeul was suggested using SEL of engine and roiling noise component separately. Finally for the validation of prediction equation, the predicted result was compared to the measured.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.160-165
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• 2004

In these days, the people living in the urban is suffer from the environmental noise because the number of car increase in the city, and a lot of new industrial complex is made in the urban every. But there is no suitable system for measurement and management of environmental noise. Therefore, in this research, a new system for the measurement, characteristic analysis and evaluation, management of environmental noise using Internet communication is developed. The system includes the environmental noise measurement equipment and the controller for the noise measurement, analysis and evaluation, management.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.1048-1051
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• 2004

The environmental pollution by noise is recognized by the pollution source made it not only to carry out harm of the Quality of a life of people seriously in most countries, but was generated for most actual problems. The measure to such environmental noise must conduct first investigation which noise generating currently regarded as questionable says in what grade has resulted and the suitable measure by that is studied. The concern of the residents who demand such a comfortable living environment is increasing rapidly. Therefore, the three areas of Jeollabuk-Do judged that noise is comparatively severe was selected. It is going to grasp delicately the noise actual condition of a residential, semi-residential, commercial, industrial area.

• Journal of Environmental Impact Assessment
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• v.33 no.2
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• pp.84-98
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• 2024

This study proposed a prediction equation for the estimation of blasting vibaration and blasting noise, utilizing 320 datasets for the blasting vibration and blasting noise acquired during urban blasting works in the Incheon, Suwon, Wonju, and Yangsan regions. The proposed blasting vibration prediction equation, derived from regression analysis, indicated correlation coefficients of 0.879 and 0.890 for SRSD and CRSD, respectively, with an R² value exceeding 0.7. In the case of the blasting noise prediction equation, stepwise regression analysis yielded a correlation coefficient of 0.911 between the prediction values and real measurements for the blasting nosie, and further analysis to determine the constant value revealed a correlation coefficient of 0.881, with an R² value also exceeding 0.7. These results suggest the feasibility of applying the proposed prediction equations when environmental impact assessments or education environment evaluation according to urban development or apartment construction projects is performed.

• The Journal of the Acoustical Society of Korea
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• v.25 no.5
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• pp.207-212
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• 2006

The purpose of this study was to compare voice parameters in auditory conditions (normal/noise/music) between a teacher group and a control group. Results of statistical analysis showed that the teacher group had higher jitter (%) and shimmer (%) values than the control group. It indicated that the teacher group had larger variations in pitch and dynamic of their voice. In the teacher group, the voice under noisy condition showed a higher value of fundamental frequency than that under normal condition. though its fundamental frequency did not show any significant difference between the noisy condition and the musical condition. In the control group, however, although the voice under noisy condition also showed a higher value of fundamental frequency than that under normal condition, its fundamental frequency was significantly different between the noisy condition and the musical condition.

• Proceedings of the Acoustical Society of Korea Conference
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• 1987.11a
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• pp.40-44
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• 1987

현대사회의 복잡한 생활환경과 더불어 주위의 밀폐공간에서 발생한 소음은 인접한 환경에서 커다란 영향을 미치고 있다. 그러므로, 본 연구에서는 밀폐공간의 음향특성을 연구하고, 또한 밀폐 공간에서 발생된 소음원이 주위의 생활환경에 미치는 영향을 최소화할 수 있는 밀폐공간의 크기를 연구하였다. 연구한 결과, 길이를 변화시킴으로써 우리가 주목해야할 주파수의 모우드 분포를 고려하여 최적한 크기를 결정할 수 있었다.

• Proceedings of the ESK Conference
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• 1994.04a
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• pp.106-106
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• 1994

암반 발파시에는 장약의 선택과 적정량의 산출 여부에 따라 소음, 진동, 분진 및 비석양이 크게 달라진다. 뿐만 아니라, 이들은 안전 및 환경적 공해요인이 된다. 따라서 본 연구는 암반발파시의 안전을 도모하고 환경공해문제를 최소화 하기 위하여, 폭약의 선택 및 취급안전, 암반 발파시의 안전대책, 소음방지대책, 분진방지대책 및 비석방지대책 등에 관한 방안을 제시하고자 한다.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.12
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• pp.1123-1128
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• 2009

Noise radiated from medical treatment at dental clinic will affect the patients. On such point of view, We investigated the noise characteristics in case of medical treatment (scaling, tooth eliminating) and non-medical examination (idling) and also evaluated the degree of indoor noise using the evaluation index such as PSIL, NRN and made up a questionnaire about the reactions to noise. As a result of noise evaluation, it shows that the range of noise level is 67.7~78.3 dB(A) and frequency is very high (above 4 k Hz) and respondents are affected by noise (unpleasantness, hesitation to visit dental clinic, shivering with noise, being astonishment). Analysis by PSIL showed that it was no problem to conversation between worker and patient. But it exceeded the noise permit level in working space by NR-curve. To relieve a fear of noise in patients, they are considered to offer the ear protection, choose the low noisevibration equipment and use the masking effect. They are of great advantage to dental clinics to i prove dental service and competitiveness.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1994.10a
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• pp.80-85
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• 1994

전 세계적으로 환경에 대한 관심이 고조됨에 따라 육상 교통 기관, 건설 장비, 심지어 가전 제품에 있어서도 소음 문제에 대한 관심이 크게 대두되고 있다. 특히, 수출을 하기 위해서는 그 나라의 소음 규제법을 만족시켜야 하며 제품의 경쟁력을 위해서는 그 이상의 것이 요구되고 있다. 또한, 소음 문제는 소비자의 제품 구매 선택에 영향을 주기도 한다. 일본의 경우 JIS 규격으로 건설 장비의 소음을 규제하고 있으며, 소음 수준에 따라 일반 장비, 저 소음 장비, 초 저소음 장비로 구분하여 장비에 따라 건설 작업을 제하하기도 하며, 특히 초 저소음 장비 인증을 받은 것은 장비 사용 단가 및 사용에 있어 차등을 두어 혜택을 주고 있다. 본 논문에서는 현재 크롤러 굴삭기에 대해 시행중인 유럽 소음 규제법 86/662/EEC 보다 강화되어 '97년부터 적용 예상되고 있는 89/514/EEC 소음 규제에 대비하여 크롤러 굴삭기의 소음 저감 대책을 논하고자 한다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1999.11a
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• pp.121-126
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• 1999

본 연구는 생활 소음이 유발하는 유해성을 객관적으로 평가할 수 있는 감성 척도를 개발하고, 그 척도를 이용하여 생활 소음과 소음에 대한 감성간 관계를 반영하는 감성 지수를 도출하고자 수행되었다. 먼저 소음에 대한 주관적 느낌을 잘 기술해주는 27 개의 형용사를 선정한 뒤, 세 가지의 실제 주거 소음을 들려주며 소음에 대한 감성을 27 개의 형용사에 대해 평가하게 하였다. 이 결과에 대한 요인분석을 실시하여 '지배성', '쾌/불쾌', '각성' 차원의 세 개 차원으로 구성되는 14 개의 최종적 소음 감성 척도를 개발하였다. 다음으로 실제 주거 생활에서 소음과 감성간 관계를 알아보기 위해 실제로 4 가지의 주거 소음을 들으면서 인지적 과제를 수행하게 하여 소음에 대한 느낌을 소음 감성 척도상에 평가하게 하는 실험을 실시하였다. 이 결과 소음의 크기가 증가할수록 소음에 대한 감성이 부정적으로 나타나는 직선적 관계가 얻어졌고. 이를 기초로 일차 방정식 형태의 소음-감성 지수를 도출하였다.