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구진회(Gu, Jin-Hoi),이재원(Lee, Jae-Won),이우석(Lee, Woo-Seok),최경희(Choi, Kyung-Hee),서충열(Seo, Chung-Youl),박형규(Park, Hyung-Kyu),김삼수(Kim, Sam-Soo),한진석(Han, Jin-Seok) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.9
The global warming caused the changes of our environment like an increasing tropical night phenomenon in the middle latitude areas. Especially, in Korea, the habitats of tropical Korean blockish cicada have changed from Jeju island located in Southern part of Korea to the whole of Korea because of the increasingly warming weather. The cicadas crying sound have been social problem because the tropical Korean blockish cicadas cry at middle of the night owing to the various outdoor lights. The cicada is positive phototaxis insect. So, the cicada is not cry at night. But if the outdoor light is very bright, then the cicada confuse the night as a day and start to cry. As a result, the cicadas crying noise has caused the resident living in downtown to an unpleasure and sleeplessness. In this research, we have measured three kinds of cicada singing noise at 16 points of urban area(Incheon, Gwangju, Busan, Gyeonggido Anyang). And then we analyzed the sound quality of the three kinds of cicada singing noise using by CADA-X signal process program. And we analyzed the acoustical characteristics by STFT(short time Fourier transform) which is a time-frequency analysis method. The characteristics of the cicada singing noise in terms of the sound quality and the time-frequency variation will be usefull to discover the relations between the human annoyance about the cicada singing noise and the acoustical characteristics.
구진회(Gu, Jin-Hoi),이상권(Lee, Sang-kwon),전완호(Jeon, Wan-Ho),김창준(Kim, Chang-Jun) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.7
In our life, we have used many digital appliances. They help us to improve the quality of life but sometimes give us unsatisfactory result. Because they produce specific noise. Especially vacuum cleaner produce much noise that is very annoying. So we need to study what sound metrics affect human sensibility. In this paper, we develop sound quality index for vacuum cleaner using the sound quality metrics defined in psychoacoustics. First, we carry out the subjective evaluation of vacuum cleaner sound to verify what vacuum sound feels good to human. And then artificial neural network estimated the complexity and the nonlinear characteristics of the relations between subjective evaluation and sound metrics. Finally the ANN is trained repeatedly to have a good performance for sound qualify index of the vacuum cleaner. As a result, the sound quality index of vacuum cleaner has a correlation of $93.5\%$ between the subjective evaluation and ANN. So, there exist three factors that Is loudness, sharpness, roughness which affect the sound quality of vacuum cleaner.
구진회(Gu, Jin-Hoi),이재원(Lee, Jae-Won),서충열(Seo, Chung-Youl),장성기(Jang, Seong-Ki),최경희(Choi, Kyung-Hee),한진석(Han, Jin-Seok) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.3
The noise emitted from an excavator has long been a cause of environmental disputes, while causing displeasure to the nearby residents. So, the ministry of environment adopted the construction machinery noise labeling system to encourage the construction machinery manufacturing companies to develop the low noise construction machinery voluntarily. But, as the quality of life improves, a growing number of people desire the comfortable and quite environment to live in. Under the situation, noise from the construction machinery has been a major cause for stress and complaints. When the noise dispute happened in the construction site, the sound pressure level of the construction machinery like a excavator was measured at the lot boundary of the noise victim's residence to judge how much noise damage occur. But the sound pressure level of the construction machinery is measured differently according to the acoustic environment of construction site and the measuring position, respectively, which makes it difficulty to judge whether the noise damage occur or not. As the sound power level of noise source is not affected by the acoustic environment of construction site and the measuring position, if we use the information of the sound power level, it will be easy to judge whether the noise damage occur and to establish the soundproofing measures. Therefore, we derive the sound power level regression model of the excavator to judge whether the noise emitted from the excavator damages to residents near the construction site. Also, the sound power level regression model of the excavator drawn in this paper will help construction companies to plan the noise reduction program in the construction sites.
강대준(Kang, Dae-Joon),구진회(Gu, Jin-Hoi),이재원(Lee, Jae-Won) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.2
As the various industrial machinery has come into being by development of industrial technology, the productivity of the basic industrial machinery has improved. However, at the same time, noise from various industrial machinery disturbs the quiet environment. There are 35 kinds of the noise emission machinery defined in the noise and vibration control act according to the horse power and the number of machinery. These were classified in 1992, and the characteristics of the noise emission machinery may be different from the past one. So we need to investigate the characteristics of the noise emitted by machinery to control it rightly. We measured sound intensity of 32 noise emission machinery to calculate the sound power levels of those and investigated the characteristics of the sound power level of those according to the frequency. We found that the forging machine, concrete pipe and pile making machine, sawing machine, etc. are noisy. The generator, the concrete pipe and pile making machine, etc. emit the low frequency noise, but the molding machine, the stone cutter, the metal cutter, etc. emit the high frequency noise.
빛공해 방지 대책을 위한 기존 보안등기구의 차광판 설치 효과 연구
한승훈(Seung-Hun Han),구진회(Jin-Hoi Gu),이윤경(Yoon-Gyeong Lee) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.3
As issues on light pollution is being raised recently, movements to prevent light pollution is being implemented by each local government, such as by enforcing the Light Pollution Act from February 2013, in order to require compliance with the light-emitting permission level of existing lighting facilities. However, despite the regulations, no specific measures on products are being prepared. Thus, this Research has designed a light shield as a measure to minimize the burden of the effectiveness and time required for development and the burden of the cost necessary to re-install existing light facilities in its entirety and reviewed the effect of the measure through the BUG ratings.
강대준(Kang, Dae-Joon),구진회(Gu, Jin-Hoi),이재원(Lee, Jae-Won) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.4
As the economy has grown and the main industry in Korea has been changed from secondary industry to tertiary industry, the importance of indoor environment has been a matter of common concern, in which one of the main concerns is to improve the indoor acoustic conditions. However, even though this is required more than before, there are no measures to protect the human being from the noise of electric home appliances. This is owing to the absence of the data about sound power level of electric home appliances. So, we investigate the sound power level of them and analyze the acoustical characteristics of each one. First, we tried to investigate the sound power measurement method of each electric home appliance. After it we test the sound power level of them. From the survey, we can know that the vacuum cleaner is the most noisy electric home appliance, and the refrigerator is the least noisy one. This results will help us predict the indoor noise level using the basic data of sound power level.
조명 시뮬레이션을 이용한 설치 환경별 차광판 선정에 관한 연구
박형규(Park, Hyung-kyu),구진회(Gu, Jin-Hoi),이규목(Lee, Kyu-Mok) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.2
도로조명 중 누출광을 고려하지 않은 보안등이 아직도 많이 사용되어 주거지 침입광이 발생되고 있다. 이러한 도로조 명의 침입광 저감을 위해 차광판이 설치되고 있지만, 효과가 미미하거나 미적 요소 및 안전성에 문제가 있다. 본 연구에서는 침입광 효율적인 저감을 위해 차광판 구조별 저감 특성을 연구하였으며, 그 방법으로 조명시뮬레이션 프로그램인 Relux 활용 하였다. 또한 시뮬레이션의 값의 정확성을 알기 위해 실제 측정값과 검증하였다. 그 결과 (상)도색 글로브를 제외한 모든 차광판에서 후사광 저감 효과가 뛰어났으며, 도장형 차광판의 경우 전사광도 줄어들어 글레어 저감도 효율 적인 것으로 확인 되었다. (상)도색 글로브는 위쪽으로 가는 빛을 아래로 반사시켜 후사광 전사광 모두 증가하였지만, 스카이 글로우(Sky glow) 저감에 효율적인 차광판으로 확인되었다. 시뮬레이션 값과 실측값은 90 %의 일치률을 보였다. The use of security lighting that emits spill light is considered a cause of light trespass problems in the residential areas. Therefore, a cutoff panel was installed as an alternative way to reduce light trespass. On the other hand, it has another problem in that it is less effective and is not good enough for aesthetics and safety. In this study, a light cutoff panel was designed and manufactured to reduce the light trespass, and the structure of a proper light cutoff panel was studied. Using a goniophotometer, the light distribution file (IES file) was extracted and the characteristics of light distribution were analyzed using the RELUX program. The results showed that the reduction of spilt light in the backward direction was decreased significantly for all types of light cutoff panels except the coated globe. In the case of a black powder coated light cutoff panel, the forward light caused by light reflected from the surface of the light cutoff panel was also reduced, which means that the black powder coated light cutoff panel is effective in the performance of light cutoff in the forward and backward directions. In addition, the coated glove increased the spilt light in the forward and backward directions because it reflects the upward light to go down. A 90 % accuracy between the measurement value of light trespass and the expected value of the light trespass was obtained from a simulation.