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민경우,이경석,박옥현,윤관주,김도술,박세일,정원삼,이대행,조영관,Min, Kyoung-Woo,Lee, Kyoung-Soek,Park, Ok-Hyun,Yoon, Kwan-Ju,Kim, Do-Sool,Park, Se-Il,Jeung, Won-Sam,Lee, Dae-Hang,Cho, Young-Gwan 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.3
Objectives: This study aimed to survey the characteristics of air quality and meteorological conditions in a greenway park. Methods: We measured meteorological and health related factors, including noise, particulate matter ($PM_{10}$) and selected gaseous air pollutants at three locations in a greenway park and on a general roadside as comparison. The measurements were repeated four times from April to October 2014. Results: The average air temperature in the greenway park was $20.7^{\circ}C$ which was $1-2^{\circ}C$ lower than on the general roadside. The average $PM_{10}$ concentration in the greenway park was $85.0{\mu}g/m^3$, a level 2-3 times lower than that at the roadside. The noise level at the greenway site was 4.4 dB(A)- 23.0 dB(A) lower than at the roadside. The average CO, $CO_2$, $SO_2$ and NOx concentrations in the greenway park were lower than at the roadside. The average phytoncide and anions concentrations in the greenway park were higher than at the roadside. Conclusions: The urban forest of the greenway park may have some impact on air quality and meteorological conditions.
소규모 세탁소의 휘발성유기화합물 발생 특성과 종사자의 건강에 미치는 영향
박옥현 ( Ok-hyun Park ),이경석 ( Kyoung-seok Lee ),민경우 ( Kyoung-woo Min ),조광운 ( Gwang-woon Cho ),윤관주 ( Kwan-ju Yoon ),정원삼 ( Won-sam Jeong ),조영관 ( Young-gwan Cho ),김은선 ( Eun-sun Kim ),양진석 ( Jin-seok Yang ) 한국산업보건학회 (구 한국산업위생학회) 2016 한국산업보건학회지 Vol.26 No.2
Objectives: The objective of this study was to evaluate the generating characteristics of VOCs and the exposure effect to chemicals among laundry workers and to identify the current status of occupational safety and health through health check-ups. Methods: During the six-month period from April to September 2015, this study quantitatively measured seven VOCs in ten laundries and carried out health examinations on 35 workers. Results: Comparing the monitoring results for the ten laundries, they were classified into three groups by ventilation system, dry-cleaning and size of shop. The average concentration of toluene, chlorobenzene, xylene, ethylbenzene, benzene, styrene and TCE were 23.9, 15.6, 5.5, 2.8, 0.9, 0.3 and 1.3 ㎍/m3, respectively. During dry-cleaning, VOC concentrations were 1.3-8.9 times higher than usual. On the other hand, at night the concentrations of toluene, chlorobenzene, xylene, ethylbenzene, benzene, styrene and TCE were 64.3, 41.5, 12.2, 6.3, 1.1, 1.2 and 6.6 ㎍/m3, respectively. The health checkup results for the 35 workers showed that 13 workers were diagnosed as normal, while 22 workers were diagnosed as requiring continuous monitoring or re-checkup of liver and hematogenous functions. Conclusions: Although the results of exposure evaluation to VOCs did not exceed reference value and items had a low correlation with health checkup items, it is necessary to improve indoor air quality due to VOC volatilization from clothes
2-microphone method을 이용한 자동차용 내장재의 임피던스 측정 실험
金寬柱,尹泰重 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-
Sound absorption and impedance are two important parameters in identifying porous materials' behavior. To reduce the interior noise of automobiles effectively, the above parameters should be known in detail. Impedance tube method with two microphones is performed to obtain the impedance of absorbing materials. By switching two microphones, more accurate impedance results are obtained. Flow resistivity, one of four Biot's parameters, is measured and by applying Delany-Bazley's law on the measurement results, impedance values are calculated. Impedance results from both the impedance tube method and flow resistivity with Delany-Bazley's law are compared with and show reasonable results in certain frequency bands. The computer simulation with SYSNOISE is also conducted to verify the impedance measurement results.