• Neonatal Medicine
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• v.16 no.2
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• pp.213-220
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• 2009

Purpose: Hearing loss is one of the common birth defects in humans, with a reported prevalence of 1-3 per 1000 newborns. We investigated the incidence of hearing loss and evaluated the use of neonatal hearing screening test in neonatal intensive care unit (NICU) graduates who are at greater risk for hearing loss than normal newborns. Methods: The neonates admitted to the NICU of Asan Medical Center from 1 March, 2003 to 30 March, 2008 who were available for follow-up were included. Those who failed the first auditory brainstem response prior to discharge were retested with the stapedial reflex test, auditory brainstem response and tympanometry in the Otolaryngology department. Results: Of 2,137 neonates, 2,000 (93.5%) neonates were tested prior to discharge. Sixty-seven neonates (3.4%) failed the first newborn hearing screening test. Of 67 infants, 52 infants were retested for a second hearing test. Excluding 10 infants (19.2%) who were lost during follow-up, 16 infants were confirmed to have hearing impairment of which 12 and 4 infants had unilateral and bilateral hearing loss, respectively. Of 16 infants, 5 did not meet the criteria set by the Korean National Health Insurance Corporation. Conclusion: The prevalence of hearing impairment in NICU graduates is about 0.8%, excluding those who were lost for follow up, necessitating a systemic and effective hearing assessment program among these high risk infants and more generous national insurance coverage.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.3 no.1
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• pp.27-34
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• 2009

Hearing impaired person's hearing loss has personally various shape, so existing symmetrical auditory filter of frequency band method wasn't properly simulated the hearing impaired person's various hearing loss shape. The shapes of auditory filter are asymmetrical different with each center frequency and each input level. Hearing impaired person which has hearing loss was differently changed with that of normal hearing people and it has different value for speech of quality through auditory filter. In this study, the asymmetrical auditory filter was simulated and then some tests to estimate the filter's performance objectively were performed. The experiment as simulated auditory filter's performance evaluation method used perceptual evaluation of speech quality (PESQ) and log likelihood ratio (LLR) for speech through auditory filter. In the test, processed speech was evaluated objective speech quality and distortion using PESQ and LLR value. When hearing loss processed, PESQ and LLR value have big difference between symmetrical and asymmetrical auditory filter. It means that the difference of the shape auditory filter may affect to speech quality. Especially, when hearing loss existed, auditory filter changing according to asymmetrical shape for each center frequency affected to perceive speech quality of the hearing impaired.

• 대한예방의학회:학술대회논문집
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• 1996.10a
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• pp.191-192
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• 1996

• Proceedings of the KOR-BRONCHOESO Conference
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• 1987.05a
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• pp.8.2-8
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• 1987

돌발성 난청은 환자에게 듣지 못하게 된다는 공포를 야기하는 질환이며 아직 확실한 병인이나 치료법이 확정되어 있지는 않다. 저자들은 인제의대 서울백병원 이비인후과에서 입원 및 동일한 치료를 받은 15례의 돌발성 난청 환자에 대하여 임상 분석하여 다음과 같은 결과를 얻었다. 1) 청력회복은 Siegel의 분류로서 완전회복 1례, 부분회복 2례, 경도회복 5례, 무회복이 7례이었다. 2) 현훈이 있었던 10례중 4례에서만 회복이 있었으나 현훈이 없던 5례중 4례가 회복되었다. 3) 청력손실이 완전농인 8례중 6례에서 무회복이었다. 4) 발병 8일 이내인 경우 치료시작 시기와 청력 회복사이 에는 연관이 없었다. 5) 적혈구침강속도(ESR)과 청력회복 사이에는 연관이 없었다.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.9 no.2
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• pp.121-128
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• 2015

In this paper, we introduce our smart phone application for hearing impaired people. Unlike previous hearing aids application, our application has both functions of self hearing tests and sound amplification. We provide user with two types of self hearing test, those are standard hearing test and detail hearing test. Each test has different advantages like short test time and accurate test result, however both tests provide reliable result. Our hearing test allows that user can measure their hearing loss level according to the frequency. Sound amplification function provide proper fitting formula by using NAL-NL1, and it guarantees high speech intelligibility. Our application can also memorize user's fitting data at specific test condition. Therefore those who using our hearing aids application can easily reset their hearing aids / earphone properties periodically. Our application is advanced at the aspect of self fitting function that no other previous application did. So we are expecting these comfortable processes about fitting lead the number of hearing aids user to be increased.

• Journal of Preventive Medicine and Public Health
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• v.30 no.1 s.56
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• pp.61-67
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• 1997

This study was performed to evaluate the effects on hearing of video tape manufacturing workers exposed to organic solvents. The experimental groups included solvents exposed group 51 and unexposed group 57 workers. All workers was examined air and bone conduction sensitivity by pure tone audiometer. The mean age of solvents exposed group was 34.1 and nonexposed group was 35.8. The mean duration of solvents exposed group was 7.3years. High frequency hearing loss prevalence of both groups was 23.5% in the group exposed to organic solvents and 17.5% in nonexposed group. There is no statistical significants in the prevalence of high frequency hearing loss. According to comparison of mean auditory threshold value by frequencies, on the air conduction test, right was statistically significant in the 250, 500, 1000, 2000, 4000Hz, except 8000Hz. Left 250, 500, 1000Hz was statistically significant. On the bone conduction test, left 250, both 500, 1000, 2000, 4000Hz, except right 250Hz, was statistically significant difference. Generally, auditory sensitivity threshold of the exposed group was higher than the nonexposed group.

• Journal of Preventive Medicine and Public Health
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• v.29 no.3 s.54
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• pp.539-553
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• 1996

The study was conducted from May to September in 1994 to investigate applicability of the Hearing Handicap Inventory for the Elderly-Screening version(HHIE-S) in parallel with the pure-tone audiometer to the initial screening test of noise-induced hearing loss(NIHL) in some noise-exposed workers. Subjects were selected by systemic sampling that took every 10th person from 6, 700 workers taking the annual occupational health examination by the department of Health Maintenance of Dongsan Hospital Keimyung University in Taegu. The authors administered the pure-tone audiometric test and self-reported questionnaire of HHIE-S including items of sociodemographic and job-related variables concurrently. The final subjects analysed were 1,019(488 males and 531 females) excluding fourteen persons who had many missing values in their questionnaires. The reliability coefficients of HHIE-S scale by Cronbach's alpha were 0.84. In the univariate analysis of hearing handicap measured by the HHIE-S, work duration, military service and the hearing threshold loss at 1KHz and 4KHz by the initial audiometer were significant in males while age, work duration and hearing threshold loss at 1KHz and 4KHz were significant in females. In the stepwise linear regression analysis, hearing threshold loss at 1KHz and 4KHz, was the only selected variable explaining the hearing handicap in males and hearing threshold loss at 1KHz and 4KHz, age, and work duration were selected in females. In ROC curves for HHIE-S scores against NIHL as gold standard which was defined by the follow-up audiogram as more than 30dB of the average of 0.5/1/2KHz and 50dB at 4KHz, the optimal cutoff for the parallel HHIE-S appeared to be 8. The results suggest that HHIE-S appeared to have some reliability and validity in this data and might be used in screening NIHL in parallel with pure-tone audiometer in noise-exposed workers.

• 대한예방의학회:학술대회논문집
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• 2002.10a
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• pp.586-587
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• 2002

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.05a
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• pp.616-620
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• 2002

가청범위의 주파수보다 낮은 소리, 즉 초저주파음과, 가청음 중 주파수가 낮은 음을 합하여 저주파음으로 분류하기도 하는데, 대략 100Hz 이하의 주파수를 갖는 음을 가리킨다. 인간이 느끼는 저주파음에 대한 영향은 여러 범위로 조사되고 있으며 주로 청력손실과 불쾌함에 미치는 영향에 초점을 맞추고 있다.(중략)

• Proceedings of the KSLP Conference
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• 2003.11a
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• pp.144-145
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• 2003

고심도의 청각장애를 가진 아동의 음성은 높은 음도와 강도, 과비음 등 건청 아동과는 매우 다른 특성을 나타낸다. 그 중에서 초분절적인 요소에 속하는 억양은 청각장애 아동의 경우 단조롭고 높낮이 변화가 크지 않아서 의미전달에 어려움을 주는 중요한 요소이다. 청력손실이 고심도인 경우 수술을 하게 되면 청각적 수용능력을 높일 수 있어, 최근 부각되고 있는 인공 와우 이식수술을 받은 아동 또한 이러한 억양에서의 문제는 완전히 해결 받지 못하고 있다. 따라서 이 연구에서는 인공 와우 이식수술을 받은 청각장애 아동이 건청 아동과 억양에서 어떠한 차이를 드러내는지에 대해 알아보고자 하였다. (중략)