• Proceedings of the IEEK Conference
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• 2009.05a
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• pp.234-236
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• 2009

종래의 음향기기에서 소리 크기는 각 주파수별로 다른 감도를 갖는 개인의 주파수 청력 특성을 고려하지 않고 모든 주파수에 대하여 동일하게 선형으로 소리 크기를 조절한다. 따라서 감도가 높은 주파수대에서 청력 손상을 일으킨다. 이를 개선하기 위한 표준 청력특성, ISO266:2003 표준을 이용한 평활화 방법이 있지만, 이 표준에 따른 등청감곡선은 여러 사람에 대해 평균한 청력특성이기 때문에 다양한 환경에 의해 변형된 개인별 청력특성에 맞지 않아 청력 손상을 감소시키는 실질적인 효과가 저하되는 문제점이 있다. 본 연구는 사람마다 다른 최소가청한계 특성을 갖는 청각특성과 최대가청한계를 고려하여 소리 크기를 조절함으로써 음향기기에 의한 청각 손상을 감소시키는 방법에 관한 것이다. 컴퓨터 시뮬레이션을 통해 청력 특성이 좋은 대역에서 기존 방법에 비해 보다 낮은 소리 크기에서 불편없이 인지 가능하다는 것을 확인할 수 있었으며, 동시에 과도한 대역별 소리 에너지를 줄여 청각 손상도 방지할 수 있다는 것을 확인할 수 있었다.

• The Journal of the Convergence on Culture Technology
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• v.7 no.1
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• pp.570-575
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• 2021

Since humans live while feeling rich in their five senses, care must be taken not to damage their hearing in order to lead a happy life. Hearing damage suffered in a living environment is common in a partial band where a specific frequency band is first damaged. However, since the initial pain of hearing damage does not appear much, it is difficult to determine the symptoms in the early stages. In this paper, we proposed a high-speed measurement method that can easily and quickly self-measure hearing damage through a simple app. In this method, 9 pure tones compensated for gain for each voice soub-band are alternately heard in both ears, so that one's own hearing damage can be detected at high speed. When 18 tone pulses were heard for 30 seconds per person, 1 out of 12 subjects was identified as suspected of partial hearing damage. And when the test subjects were informed of the hearing determination method for the number of hearings, the participants themselves immediately determined whether their hearing was damaged. This measurement method simply judges the hearing of both ears within 30 seconds with a smart phone, so that hearing measurements that took more than 10 minutes in hospitals are relatively accurate, and it was found that hearing health can be maintained while reducing time and costs.

• Journal of the korean academy of Pediatric Dentistry
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• v.39 no.3
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• pp.267-272
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• 2012

Dental professionals are exposed to various occupational risks, among which the problem of hearing damage has been newly revealed. There have been some researches reporting that noise occurring in a dental office exceeds the Occupational Safety and Health Act (OSHA) Standards. Especially, the pediatric dentists are repeatedly exposed to an additional noise source called the crying sound of children in addition to all kinds of noises from dental instruments. Accordingly, this study intended to investigate the noise environment likely to affect pediatric dentists and to examine the possibility of resultant hearing damages. The level of noise was measured respectively, when various dental instruments (ultrasonic scaler, high-speed handpiece, low-speed handpiece) are operated, when children are crying, and when both occasions take place simultaneously (from the distance of 30 cm) with a portable noise meter. And the daily duration of pediatric dentists exposed to the noise environment was surveyed. The results were compared with the standard value of noise threshold of NIOSH, OSHA, and that of hearing damage of CRA News letter respectively. Considering the intensity and exposure time, the noise environment of pediatric dentists exceeds the allowable noise threshold values. Even only one exposure to crying child was likely to lead to permanent hearing damage. Comparatively, pediatric dentists have a higher risk for occupational hearing damages, and some active measures are thought highly desirable to minimize it.

• Progress in Medical Physics
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• v.9 no.4
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• pp.217-225
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• 1998

In this paper, the analysis of the relation between noise induced hearing loss and noise exposure is described for the A-weighted noise levels and exposure duration. The hearing loss and sensitivity threshold shift is investigated by changing the various parameters such as the effects of aging and noise exposure. Total hearing loss is proportional to a function of exposure level based upon the integral of pressure with time. If the noise exposure term is large so that the presbycusis may be neglected, the hearing loss due to aging and noise exposure becomes the noise induced hearing loss. It is shown that exposure to excessive noise can cause temporary loss of hearing that may become permanent if the exposure is prolonged or intense. An audiogram taken from a person suffering from noise induced hearing loss will usually show the greatest loss of hearing sensitivity in the 4kHz region, which is typically the region most sensitive to damage resulting from many types of industrial noise.

• The Journal of the Acoustical Society of Korea
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• v.29 no.3
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• pp.184-190
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• 2010

Lowering of auditory caused by noise is increased, these days. Especially, people who have noise induced hearing loss by permanent exposure to noise are increased according to spread out of multimedia and improvement of information equipment. The pure tone audiometry used in the hospital presently inspect auditory manually up to 8,000 Hz bandwidth. So the case of noise induced hearing loss which suffered from extended high frequency over 8,000 Hz, there is a problem to prevent hearing loss by precognition. In this paper, we proposed a method to prevent noise induced hearing loss by using extended high frequency bandwidth from 12,000 Hz to 20,000 Hz. We have got a experimental result to fifty of twenties who are often used to earphones through portable equipment. As a result, 36% of twenties show lowering of auditory caused by noise and 2% of them shows severe loss of hearing.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.7 no.1
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• pp.113-122
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• 1996

장애복지 선진국의 통계에 의하면 감음성 난청아의 약 80%가 중도(severe, 71-90dB, WHO 분류)와 최중도(profound, 91dB이상, WHO 분류) 난청이라고 한다. 출생 이전 및 출생시(선천성)에, 또는 2세 이전의 전언어기부터 청력을 않은 감음성 난청아 중에서, 청력 손상 정도가 심한 중도 이상인 경우에는 음성언어능력의 발달을 기대할 수 없는 것으로 간주되어, 즘은 의미에서의 구화에 의한 의사소통 내지 일반교육장에서의 교육도 불가능한 것으로 여겨져 왔다. (중략)

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.6
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• pp.1188-1193
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• 2009

Todays, many young people suffer from noise-induced hearing loss by using wearable hearing devices, such as Bluetooth headset. This paper present hearing loss reduction and more natural volumn control algorithms considering individual hearing characteristics and threshold of feeling for Bluetooth headset. Experimental results using CSR Bluetooth headset example design board(DEV-PC-1645) show that individuals maybe able to perceive without the inconvenience at the less sound intensity and the more sensitive frequency bands. As a result, we may prevent hearing loss to reduce excessive sound energy in each frequency bands.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.383-386
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• 2009

Todays, many young people suffer from noise-induced hearing loss by using wearable hearing devices, such as Bluetooth headset. This paper present hearing loss reduction algorithms considering individual hearing characteristics and threshold of feeling for Bluetooth headset. Experimental results using CSR Bluetooth headset example design board(DEV-PC-1645) show that individuals may be able to perceive without the inconvenience at the less sound intensity and the more sensitive frequency bands. As a result, we may prevent hearing loss to reduce excessive sound energy in each frequency bands.

• The Monthly Diabetes
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• s.212
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• pp.30-31
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• 2007

대학원생 김모씨(28세 여)는 귀에 갑작스런 통증을 느끼기 시작했다. 또 급격하게 저하된 청력으로 친구들의 말귀를 잘 못 알아들어 '사오정'이라는 별명도 얻게 되었다. 통증이 심해 병원을 찾아간 결과 외상성 고막천공이라는 진단을 받게 되었다. 이는 귀이개가 고막을 관통해 발생한 질병으로 귀이개로 귀를 후비던 중 실수고 너무 깊이 파 통증이 나타나게 된 것이다. 다행이 다른 부위는 손상이 없어 외래에서 간단한 수술 및 통원치료 후 증상은 좋아졌다. 또 직장인 박모씨(34세 남)는 어느 날부터 갑자기 귀에서 고름이 나오고, 고약한 냄새를 풍겨 병원을 찾았는데, 만성 외이도염이라는 진단을 받았다. 원인은 하루가 멀다 하고 귀지를 파내는 오래된 습관 때문이라는 것이다. 습관을 바꾸지 않으면 앞으로 청력도 떨어질 수 있다는 의사의 말에 귀이개부터 멀리하기 시작했다. 고려대 안산병원 이비인후과 조승현 교수는 "종종 속을 썩이는 것이 귀지"라며 "무리하게 후비다가는 고막까지 버릴 수 있으므로 함부로 파서는 안된다"고 지적한다.

• Journal of the korean academy of Pediatric Dentistry
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• v.47 no.1
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• pp.62-69
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• 2020

This study intended to evaluate noise level of dental handpieces and the effects of noise cancelling devices. An ear model was designed to measure the level of the noise delivered to the inner ear during dental handpiece operation. The level of noise was measured in various conditions using the ear model and the portable noise meter. Noise level was measured again after applying of 4 different noise cancelling devices to the model ear. The noise level of dental handpieces was 82.5 - 84.4 dB. When 4 types of noise canceling devices were applied, the noise level reduced to 67.4 - 73.8 dB. All 4 devices had statistically significant effect in reducing the noise of the handpiece. Considering the intensity and exposure time, noise in dental clinics can cause hearing damage to dentists. For protection from the risk of occupational hearing damages, noise canceling devices can be recommended.