• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.19 no.1
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• pp.63-72
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• 2009

고령 근로자의 작업환경 실태와 건강검진 자료를 분석하여 그들의 건강한 생활과 삶의 질을 향상시킬 수 있는 정책의 기초자료를 마련하고자 시도되었다. 대상자는 부산, 경남지역에 소재하는 41개 사업장에서 유해인자에 노출되어 작업하는 공정에 있는 50세 이상 근로자 112명(남성 91명, 여성 21명)을 대상으로 소음, 분진, 유기용제, 중금속, 작업형태 및 작업강도 등을 측정, 분석하였으며, 건강검진 자료는 일반건강진단표를 이용하여 다음과 같은 결과를 얻었다. 1. 대상자의 평균연령은 54.9(남성 55세, 여성 54.7세) 세였으며, 평균근무기간은 8.7년이 였으며, 조사대상 사업장중 71.5%가 50인 이하의 근로자를 고용하고 있는 사업장이 였다. 2. 소음에 폭로 대상자 중 31.3%가 90dB(A)인 노출기준치을 초과하였으며, 그 외의 분진, 유기용제, 중금속 등의 노출기준치를 초과한 대상자는 없었다. 3. 조사대상자 중 9%는 청력이 비정상이였으며, 78.6%의 대상자는 경작업과 중등작업을 하였으며, 52.7%는 전신을 이용하여 작업하는 형태였다.

• Transactions of the KSME C: Technology and Education
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• v.3 no.2
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• pp.117-124
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• 2015

Recently, noise reduction in room air conditioner has been one of the most important issues as well as cooling efficiency. A rotary compressor is widely used in room air conditioners. But, the rotary compressor is the dominant vibration/noise source in an air conditioner. A number of studies have been conducted on reducing rotary compressor vibration/noise through improving muffler and resonator design. However, a noise delivering path between compressor and pipe is not fully taken into consideration. In this paper, the vibration analysis model of rotary compressor is modeled using RecurDyn and experimental validation is presented.

• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.6
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• pp.90-94
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• 2021

With the increased interest on quiescent place for residential place, the noise generation from facilities needs to be minimized. One important noise source include sounds from operation of elevators. The elevator operates between floors and generates significantly annoying sounds to the nearby living spaces. It is recognized as the significant contributor inducing noise annoyance to residents. Elevator is supported to the building structure at several locations for movements between floors. In this study, the vibration reduction by use of polymer concrete on the support location was demonstrated. By measuring and comparing the vibration generation when supported on cement and polymer concrete, the noise reduction performance was evaluated. The polymer concrete was made in the form of being inserted into the wall that imitates the hoistway. The impact vibration was induced to the bracket and vibration transfer magnitude was measured. The damping ratio was evaluated through normalization and curve fitting of transient response, and comparison was performed for each resin mixing ratio. By use of polymer concrete, it was possible to reduce the vibration generation in an effect manner without sacrifice on the structural rigidity.

• Explosives and Blasting
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• v.30 no.2
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• pp.1-8
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• 2012

The only law related to airblast and ground vibration control in Korea is the Noise and Vibration Control Act enforced by the Ministry of Environment. But this law mainly deals with the annoyance aspects of noises and vibrations in ordinary human life. Hence, the law defines the safety criteria of ground vibration as the vibration level (VL) of dB(V) unit. The ground vibrations produced from blasting, however, have the unique characteristics that can be shown in shock vibrations, and the duration is also very short compared to the vibrations from machinery, tools or facilities. Hence, vibration regulations for blasting operations usually define the safety criterion as the peak particle velocity (PPV) considering the effect of ground vibrations to structural damage. Notwithstanding, there are several attempts that predict VL from PPV or estimate VL based on the scaled distances (SD; in unit of $m/kg^{1/2}$ or $m/kg^{1/3}$) without considering their frequency spectra. It appears that these attempts are conducted mainly for the purpose of satisfying the law in blasting contracts. But, in principle there could no correlation between peaks of velocity and acceleration over entire frequency spectrum. Therefore, such correlations or estimations should be conducted only for the waves with the same or very similar frequency spectra.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.6
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• pp.103-108
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• 2016

The size of urban areas is currently growing and the functions of cities are becoming increasingly complicated. Furthermore, more people are living in cities. The life of urban is getting closer and linked with neighboring people in many parts. In particular, people are making artificial noise, even though it might not consciously be noticed, in their daily live. Seoul is the most crowded place in Korea and the noise levels are 73dB or higher. People living in cities are exposed to noise pollution. In particular, loudspeakers used during demonstrations or to generate publicity, cause considerable noise, which in turn can be related to stress. Moreover, the noise restrictions defined by law are not adhered to. If enhanced noise regulations, no matter how residents are not forced to be a great stress field close to the noise and reduces the loudness -5dB do not feel well if the difference. Limiting the duration of noise rather than reducing the volume thus is a much more plausible way of reducing the damage caused by noise pollution. If the stress caused by the noise, you will see people or vehicles holding a megaphone at the roadside is not good for health if it may be a wise way to live that is getting rid of the noise pollution so quickly out of the area.

• Tunnel and Underground Space
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• v.16 no.2 s.61
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• pp.179-188
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• 2006

The vibration or/and noise generated by blast operations might cause not only structural damage to properties but mentally also to humans and animals. For that reason, maximum permitted vibration and noise levels are set by sensitivities of structures and they are used for the management of blast vibration. It is known that the fish lived in water are more sensitive to vibration than land animals, and thus the adverse impact of the blasting on fish farms should be very concerned. This study investigated the vibration and noise levels at a large eel farm located some 840 meters of the blasting site through the large real-scale experiments of blastings, prior to conducting the actual blasting. As a result, it was found that the noise met the requirement to be within maximum permitted level, while the ground vibration exceeded the permitted vibration. Accordingly, the impact of the excess vibration was investigated by an existing empirical method and verified by a new three dimensional numerical analysis. In this study, such an inspection process was briefly described, and a method was suggested for the examination of possible adverse effects from blasting on vibration-sensitive structures like the eel farm. The study also introduced a design method that controls the blast effects - ground vibration and noise.

• Journal of Korea Entertainment Industry Association
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• v.13 no.6
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• pp.265-275
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• 2019

The purpose of this study was to analysis of the changes of the white noise on the change of the writing ability and hand function of the children with the intellectual disabilities and then provide the basic information about that. The subjects was 12 children with intellectual disabilities. White noise was applied to analyze the subjects' writing ability and hand function before and after application. The provision of the white noise was continuous and uniform through the white noise generator. The analysis of the writing ability was performed by using the KNISE-BAAT assessment and the writing, vocabulary and composing ability were evaluated for the writing ability of the subjects. Also, the analysis of the hand function was performed by using the pegboard sub-item of the Manual Function Test. The results of the writing ability showed the statistically significant increase of the writing and vocabulary ability, but in the case of the composing ability, there was no statistically significant increase in the composing ability. Also, the results of the hand function showed the statistically significant increase in the both hands. The use of the white noise should be considered as a compensatory approach to improve the writing ability and hand function of the children with intellectual disabilities. Also, in order to improve the level of the performance, learning level, and academic achievement of the children of the intellectual disabilities, the application of the white noise in the living and learning environment should be needed to consider.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.11a
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• pp.49-54
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• 2001

본 연구에서는 가전제품의 동작상태를 사용자에게 적절히 알릴 수 있는 정보음의 적합성 평가기준을 마련하기 위하여 선행연구 결과와 주부들을 대상으로 가전제품의 사용실태를 분석하였으며, 고령자들도 알아듣기 쉽고 생활소음에 mask 되지 않으며 들어서 쾌적하도록 1, 1.6, 2, 3, 4 kHz의 완전 5도화음으로 구성된 정보음을 제작하여, 평균발음빈도(F)가 1.67 Hz인 그룹과 0.91 Hz인 그룹의 Attac(A)과 Decay(D)를 변화시켜 A/D의 변화에 따른 단순반응시간을 측정한 결과 F가 1.67Hz 그룹에서 A/D가 작을수록 단순반응시간이 짧아지는 경향을 확인하였으며, F가 1.67Hz와 0.91Hz의 수준에 따른 단순반응시간 차이검증 결과 p < 0.001 수준에서 유의미하여 5점 척도로 평가하였으며, 요인분석결과 첫 번째 요인은 긴박성요인, 두 번째 요인은 명료성 요인, 세 번째 요인은 역능요인, 네 번째 요인은 평가요인으로 나타났다.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.971-973
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• 2022

본 논문은 수액 치료 부작용 방지와 환자의 안전한 병원 생활환경을 조성하는 "장애인의 안전한 병원 생활을 위한 스마트 링거 폴대"를 제안한다. 본 논문이 제안하는 주요 특징은 다음과 같다. 첫째, 무게 센서로 수액의 잔량이나 주입 속도를 측정하고 조절한다. 사용자는 앱을 통해 수액에 대한 정보를 확인할 수 있다. 둘째, 자이로 센서로 측정한 팔의 높이와 적당하게 자동으로 폴대의 높낮이를 조절한다. 셋째, 앱과 조이스틱으로 링거 폴대를 상하좌우 움직이며 이동 경로에 장애물 존재 시 알람을 울리게 한다. 넷째, 심박수 센서를 통해 환자의 평균 심박수를 측정하고 심박수 값이 정상 범위를 벗어나는 경우 아로마, 백색소음, 수면유도, 심리상담을 통해 심리안정 서비스를 제공한다. 제안된 시스템은 기존 병원에서 수액을 투입하는 방식에 IoT 기술을 적용하여 수액 치료 부작용을 예방하며, 시각장애인 환자의 거동 도움 및 불안감 해소를 위한 편의 서비스를 제공하는 것을 목표로 한다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.217-218
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• 1999

최근 들어 경제의 발전과 생활수준이 향상됨에 따라 악취는 소음과 함께 환경분야에 많은 민원을 야기하고 대기오염물질의 하나로 인식되고 있다. 특히 유황계 화합물을 대표하는 악취물질인 황화수소는 무색의 기체로써 부패한 계란 냄새가 나고 역치농도(Threshold Odor Value)가 0.00047ppm$_{v}$ 로 매우 낮은 농도에서도 취기를 감지할 수 있는 것으로 알려져 있다. 이러한 성질을 갖는 황화수소는 석유 화학공업이나 제지공업, 폐수처리장 그리고 폐기물 처리장 등에서 많이 발생하고 있다.(중략)