자외선 소독기에서 발생하는 자외선 (UV) 노출평가

이광용(GwangYong YI),김대성(Dea Sung Kim),김생진(Sung Jin Kim),이진우(Jin Woo Lee),정지연(Ji Yeon Jeong),박정선(Jung Sun Park),정호근(Ho Keum Chung) 한국환경보건학회 2001 한국환경보건학회 학술대회 자료집 Vol.2001 No.-

버스 정비 작업자에 대한 석면 및 디젤 엔진 배출물질 노출 평가

이나루 ( Naroo Lee ),이광용 ( Gwangyong Yi ) 한국산업보건학회 (구 한국산업위생학회) 2016 한국산업보건학회지 Vol.26 No.2

Objectives: Lung cancer occurred with worker working in an urban bus garage. A survey was conducted to investigate whether lung cancer had causal relationship with work. Exposure to asbestos and diesel engine exhaust were suspected. Methods: Airborne asbestos was sampled on membrane filter and analyzed using phase-contrast microscopy. Airborne diesel exhaust was sampled using quartz filter and analyzed with thermal-optical analyzer. Polynuclear aromatic hydrocarbons was sampled using PTFE filter and XAD-2 tube and analyzed with gas chromatography-mass selective detector. Results: Airborne asbestos concentration was under 0.01 fiber/cc. Worker who warmed up an engine of urban bus for 2 hours was exposed to elemental carbon concentration, 15.5㎍/㎥. Only naphtalene among polynuclear aromatic hydrocarbons was detected. Conclusions: It was difficult to conclude about worker exposure to asbestos because working hour related asbestos was too short. In reviewing papers, the exposure to asbestos over 0.01 fiber/cc during exchange brake lining was found. It was identified that worker``s occupational exposure to diesel exhaust based on elemental carbon was higher than the other occupational exposure to diesel exhaust

폴리이미드 절연체 구조의 EM급 패치 히터에 대한 열전달 특성 해석

김준현(Joon Hyun Kim),성재용(Jaeyong Sung),이광용(Gwangyong Lee),김명길(Myunggil Kim),조영준(Young-Jun Cho) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.3

우리나라 산업보건 주요기관의 인력 현황

피영규 ( Young Gyu Phee ),김승원 ( Seung Won Kim ),이사우 ( Sa Woo Lee ),이광용 ( Gwangyong Yi ) 한국산업보건학회 2023 한국산업보건학회지 Vol.33 No.1

Objectives: The purpose of this study was to identify information on the workers at major industrial health institutions. Methods: The subjects were employees at work environment measurement institutions, specialized health management institutions, special health examination institutions, and health checkup institutions. Data on these employees was identified by age, career, region, and qualification. Results: The sample totaled 6,449 workers at major industrial health institutions. The number of doctors, nurses, and industrial hygienists was identified at 4,609. For their age groups, 34.1% were in their 30s, and 56.3% had less than five years of work experience. The distribution by region was 24.3% in Gyeonggi-do Province, 12.7% in Seoul, and 8.7% in Gyeongsangnam-do Province. Conclusions: Information on occupational health human resources has been published irregularly and is limited by specialty. Therefore, it is necessary to systematize information on human resources and disclose it regularly so that supply and demand conditions can be predicted when establishing industrial accident prevention policies.

실버-페이스트의 스크린 인쇄공정을 적용한 인공위성용 필름 히터의 열전달 성능해석

김준현(Joon Hyun Kim),최진우(Jinwoo Choi),성재용(Jaeyong Sung),이광용(Gwangyong Lee),김명길(Myunggil Kim),조영준(Young-Jun Cho) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.6

노출기준 적용을 위한 세탁소용 석유계 솔벤트 특성규명

정지연,이광용,이나루,전홍진,김성진,이인섭,김광종 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.1

Although in the U.S perchloroethylene is the most commonly used in commercial dry cleaning shops, petroleum based dry cleaning solvent is the most frequently used in Korea. The solvent is a mixture of hydrocarbons, straight or branched chain aprraffins, naphthenes, and aromatic hydrocarbons. Exposure assessment at the cleaning shop was mainly focused on highly toxic substances, especially benzene, toluene, xylene, ethylbenzene, and 2-butoxyethanol in the solvents. However the contents of the toxic substances in the solvents are very small. Not only the exposure assessment for highly toxic substances is important, but also exposure for the petroleum based solvent itself is more important in dry cleaning shop. The specific aim of the present study was to identify the physical and the chemical properties of petroleum based dry cleaning solvents and to investigate the possivility of using occupational exposure standard of stoddard solvent for overall expostreassessment of petroleum based solvent. Four different petroleum based solvent(solvent A~solvent D). commonly used in Korda were analyzed and investigated for identifying the phtsical and chemical properties of those solvents. Molecula species of those solvents were C8~C12, and predominant molecular species were C10~C11 for solvent A, solvent C, solvent D. C9~C10 for solvent B. The proportion of paraffin, aromatic, naphthenic,and olefin compounds in dry cleaning solvents was 45.5~54.5%, 16.0~21.4%, 7.9%~15.8%, and 0.8%~1.0%, respectively. The range of boiling point, specific grabity, flash point found in material safety and data sheet made by the solvent manufacturing company was 150 ~210˚C. 0.76~0.79, and 30~44˚C., respectively. We conclude that petroleum based solvents used in dry cleaning shop is almost similar to stoddard solvent defined by ACGIH and NIOSH, and the occupational exposure standard of stoddrd solvent could be used in total exposure assessment of those solvents.

자동차 프레스 공정에 있어서 직무 및 누적소음기 설정치 차이에 따른 작업자의 소음노출 평가

정지연,박승현,이광용,이나루,유기호,박정선,정호근 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.3

Noise-induced hearing loss(NIHL) was the highest rate(43.5%∼58.5% from 1996 to 1998) of positive findings through specific medical program in Korea. There were much more NIHL at workers of automobile manufacturing factories than other manufacturing factories. The specific aim of the present study was to determine the noise exposure of automobile press lines, according to their job titles, press line types(auto, semiauto), dosimeter parameters setting. There were a total 11 press lines sampled at a automobile manufacturing company. Among those press lines, 10 press lines were autolines with acoustic enclosure, one semiauto press line was no aucostic enclosure Noise exposure data were sampled for an work shift using noise dosimeter, which recorded both time-weighted average(TWA) and 1-min average. The mean OSHA TWA(Korea TWA with threshold 90) was 80.7 ㏈(A) ±4.7 ㏈(A) for leader, 82.8 ㏈(A) ±4.5 ㏈(A) for pallette man. 76.7 ㏈(A) ±4.3 ㏈(A) for press operators, 76.6 ㏈(A) ±5.6 ㏈(A) for crane operators, 77.1 ㏈(A) ±2.8 ㏈(A) for forklift drivers, whereas the mean NIOSH TWA was 88.9 ㏈(A) ± 1.7㏈(A) for leader, 89.6 ㏈(A) ±21.㏈(A) for pallette man, 86.7㏈(A) ±1.8㏈(A) for press operators, 88.5 ㏈(A) ±2.0 ㏈(A) for crane operators, 87.7 ㏈(A) ±1.0 ㏈(A) for forklift drivers. While L10 for NIOSH TWA samples was 84.8 ㏈(A) ∼ 87.3 ㏈(A), L10 for OSHA TWA samples was 69.5 ㏈(A) ∼ 77.4 ㏈(A). L10 means that the TWA for 90% of the samples exceeded L10. Among OSHA TWA(Korea TWA with threshold 90) samples for pallette man, 7.7 % exceeded 90 ㏈(A), the OSHA permissible exposure level, but OSHA TWA samples for the other job titles didn't. Among NIOSH TWA samples, the samples over 85 ㏈(A), the NIOSH recommended exposure limit, was 100%(leaders), 83.3 %(operators), 97.4%(pallette man), 100%(forklift drivers), 91.7 %(crane operator). The results of One-way random effects analysis of variance models shows that the difference between job titles was significant by OSHA TWA(p<0.05), but not significant by NIOSH TWA(p>0.05). NIOSH TWA samples were significantly higher than OSHA TWA samples(P<0.05). Regression analysis was used to obtain relationships between OSHA TWA samples and NIOSH TWA samples. In this case the coefficient of determination = 0.09, which shows the high degree association between two methods. Regression equation, NIOSH TWA = 0.552 * OSHA TWA + 42.13 ㏈(A), shows that if OSHA TWA is known, NIOSH TWA can be predicted by the equation. The mean TWA difference between threshold 80dBA and 90dBA was significant(p<0.01). While the TWA noise exposures were 7.7% above the Korea(OSHA) PEL, they were more than 83.3% over NIOSH REL. Automobile workers were exposed to noise level that could be potentially damaging to their hearing. It found that their approximately 25% excess risk of hearing loss even if a worker is protected to the PEL in according to NIOSH study. So these data demonstrate the need of engineering control for noise reduction of press line and comprehensive hearing conservation programs for whole workers(press operator, crane operator, forklift driver). The Noise measurement criteria of Korea has no definition about threshold value. So I suggest that we should set the threshold set the threshold value by law.