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송재준,채성원,김동하 대한이비인후과학회 2024 대한이비인후과학회지 두경부외과학 Vol.67 No.4
Recently, reports of noise-induced hearing loss (NIHL) have sharply risen among workers inSouth Korea, almost 20-fold in 2022, compared to 2012. This is presumably because NIHL iscombined with age-related hearing loss. For the correct diagnosis of NIHL, therefore, the ef-fect of aging that contributes to threshold shifts is should be excluded, and that would requirescrutinizing of various established methods. Additionally, international and domestic datafrom large cross-sectional studies may provide new insights in excluding the effect of age-re-lated hearing loss in individuals in which threshold shifts occurred. This paper comprises therecommendations for the diagnosis and quantification of NIHL in a medico-legal context.
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다채널 GPR 시험을 통한 교량 콘크리트 바닥판 상태 평가 연구
송재준,박경훈,이용준,박희문 한국도로학회 2023 한국도로학회논문집 Vol.25 No.5
radar (GPR) testing and compare the value of its dielectric constant value with actual concrete condition. METHODS : The reflection coefficient method was used to measure the dielectric properties of concrete bridge decks. Air-coupled step-frequency GPR testing was used to measure the time taken for reflection from the interfaces between the layers. Specimens of the asphalt mixture and concrete bridge-deck were collected by field coring. GPR testing was conducted on two bridges with different concrete bridge deck conditions on national highways. After the GPR tests, the actual conditions of the concrete bridge deck were investigated using specimen coring. RESULTS : GPR testing indicated that the dielectric constants of concrete bridge decks in good condition ranged from 8 to 10, whereas those corresponding to poor condition ranged from 4 to 6. The results of GPR testing can determine the actual condition and degree of distress of concrete bridge decks determined from the specimen coring data. Therefore, GPR testing is appropriate for nondestructively evaluating the condition of a concrete bridge deck. CONCLUSIONS : The analysis results of the dielectric constants of the concrete bridge deck obtained from multichannel GPR testing were consistent with the actual bridge deck conditions. In the near future, an additional verification process for this approach under different bridge conditions will be required to improve its precision and ensure reliability.
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