밀폐공간 질식재해 통계현황 분석

유계묵,박현희,정광재 한국산업위생학회 2009 한국산업보건학회지 Vol.19 No.4

The total number of confined space accident cases from 1999 to 2007 in Korea were 220, causing 353 injuries and 212 casualties. Out of 220 cases, 44(20.0%) occurred in sewage treatment facilities and 40(18.2%) occurred in both manholes and containers. When the main causes of confined space accidents were classified, oxygen deficiency accounted for 69 cases(31.4%), carbon monoxide, 48(21.8%), hydrogen sulfide, 40(18.2%), and organic solvent, 32(14.5%). Improvement of occupational accident statistics is necessary in order to report accurate and precise data for confined space accidents. The structure of confined space must be considered when selecting gas to be measured.

콜센터 근로자의 청력역치에 영향을 미치는 요인

유계묵 ( Kye Mook Yoo ),김갑배 ( Kab Bae Kim ),정광재 ( Kwang Jae Chung ),김규상 ( Kyoo Sang Kim ) 한국산업위생학회 2011 한국산업보건학회지 Vol.21 No.3

Objectives: Hundreds of thousands of call center workers are wearing an acoustic device for their businesses, such as telemarketing and customer counseling, and the number of the workers are increasing sharply. Because call center workers always talk to dozens of customers over the headset, they would be placed under the state of a higher risk with their hearing ability. The purpose of this study is to investigate factors that affect the hearing thresholds for the call center workers. Methods: This study investigated hearing losses of 101 workers of 5 call centers in Korea by executing puretone audiometry and self-administered questionnaires. A cross table analysis was processed to compare gender differences between male and female. Male and female hearing thresholds were compared with the Students` t-test, and one-way ANOVA was conducted to observe the difference between non-occupational and occupational characteristics in 2, 3, 4, 6, and 8 kHz hearing thresholds for the female workers. Additionally, multiple regression analysis was conducted to find the factors that affect the 4 kHz hearing thresholds. Results and Conclusions Results and Conclusions: Male hearing thresholds were higher than those of female except for 8 kHz. In the group having an ear related disease, hearing threshold of male left ear was highly affected rather than that of female in 4 kHz. There were significant differences in the variables of alcohol drinking (2 kHz) and headset volume (8 kHz) in both ears. While this study does not show any significant factors that affect the hearing thresholds in the occupational characteristics, the gender and the previous ear related diseases, non-occupational characteristics, were found as the factors in 4 kHz. It is suggested that the more detailed survey be performed to identify the occupational factors that affect the hearing thresholds in the call center workers based on the result derived from this study.

특정 가구 제조 공장의 포름알데히드 발생 공정 노출 평가

유계묵(Kye-mook Yoo),이미영(Mi-Young Lee) 한국분석과학회 2014 분석과학 Vol.27 No.5

중밀도 섬유판(MDF) 가구 조립 노동자에서 발생한 골수형성이상증후군

최민,유계묵,박철용,박현희,김형렬 대한직업환경의학회 2014 대한직업환경의학회 학술대회 논문집 Vol.2014 No.11

원저 : 작업환경측정제도 규제 순응 실태

변상훈,이관형,유계묵,피영규 한국산업위생학회 2009 한국산업보건학회지 Vol.19 No.3

일부 산업보건관련 기관의 분석실험실 안전보건에 관한 실태와 대책

노영만,원정일,한진구,유계묵 한국산업위생학회 2000 한국산업보건학회지 Vol.10 No.2

This study was conducted at occupational health laboratories in Seoul and Gyunggi district area from December, 1999 to January, 2000. The main purpose of this study was to survey the actual condition of safety and health by questionnaire and checklist and to assess the performance of fume hoods and the airborne exposures to chemicals in the laboratories. The chemicals in the cabinet were not classified by hazardous properties and the compressed gases ware not stored safely. The prevalences of laboratories having first aid kits, fire extinguishers, and safety showers were found to be 18%, 55%, and 9%, respectively. Most laboratory workers were not educated for safety and hearth. Also, there was no performance evaluation for hazards and risks. The fume hoods in laboratories had not been annually inspected by checklist and the face velocity had been checked more than one time in the previous year for only 18% of them. Five percent of fume hoods had the face velocity more than 4.0 m/sec and 17% had no capture performance. Detected organic solvents were methylenechloride, acetone, ethylbenzene, isopropanol, xylene, methylisobutylketone, trichloroethylene, and toluene. The concentrations of organic solvents were much less than the occupational exposure limits proposed by the Ministry of Labor in Korea. This study showed that the actual condition of safety and health was not appropriate for laboratory workers. It is recommended that laboratory workers should be educated for the treatment and storage of hazardous chemicals and compressed gases to improve the working environment of the occupational safety and health laboratories.

음향도구 착용 근로자의 소음노출 실태에 관한 연구

김갑배(Kim, Kab-Bae),유계묵(Yoo, Kye-Mook),이인섭(Lee, In-Seop),정광재(Chung, Kwang-Jae) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.7

There are hundreds of thousands call center workers wearing acoustic device. However, researches and noise exposure measurements on the noise transmitted from acoustic devices have seldom been performed due to the difficulty of measurement and to the absence of the measuring method in Korea. The aim of this study is to set up management measures to protect hearing loss on the call operator by acquiring measurement data of noise transmitted from the headset. Noise exposure measurements of 17 operators were performed in 7 call centers and head and Torso simulator method in compliance with the ISO standard 11904-2 was used for the measurement of noise transmitted from the headset. Sound pressure levels(SPL) transmitted from the headset were 73.2~86 dB(A). The operator exposed to the highest SPL set up his volume control at 9 which was the highest volume level. The volume control level, adjustable from 1 to 9, could be identified 12 out of 17 operators and the range of volume levels was 4.5~9. As a result of pearson correlation analysis, the correlation between volume level and SPL transmitted from the headset showed high relation as significance at the 0.672 level(p<0.05). To protect hearing loss of call center operators, it is more practical and effective measure to limit the volume level below the noise exposure level, i.e. 85 dB(A), rather than to carry out noise monitoring considering cost-effective aspect.

음향도구 착용 근로자의 소음노출 실태에 관한 연구

김갑배(Kab Bae Kim),유계묵(Kye Mook Yoo),이인섭(In Seop Lee),정광재(Kwang Jae Chung) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4

There are hundreds of thousands call center workers wearing acoustic device. However, researches and noise exposure measurements on the noise transmitted from acoustic devices have seldom been performed due to difficulty of measurement and to the absence of the measuring method in Korea. The aim of this study is set up management measures to protect hearing loss on the call operator by acquiring measurement data of noise transmitted from the headset. Noise exposure measurements of 17 operators were performed in 7 call centers and Head and Torso Simulator method in compliance with the ISO Standard 11904-2 was used for the measurement of noise transmitted from the headset. Sound pressure levels(SPL) transmitted from the headset were 73.2~86 dB(A). The operator exposed to the highest SPL set up his volume control at 9 which was the highest volume level. The volume control level, adjustable from 1 to 9, could be identified 12 out of 17 operators and the range of volume levels was 4.5~9. As a result of Pearson Correlation Analysis, the correlation between volume level and SPL transmitted form the headset showed relation as significance at the 0.672 level(p<0.05). To protect hearing loss of call center operators, it is more practical and effective measure to limit the volume level below the noise exposure level, i.e. 85 dB(A), rather than to carry out noise monitoring considering cost-effective aspect.

화학물질 노출 근로자를 위한 호흡보호구 선정 지침 개발

한돈희 ( Don Hee Han ),유계묵 ( Kye Mook Yoo ) 한국산업위생학회 2014 한국산업보건학회지 Vol.24 No.3

Objectives: Korean Occupational Safety and Health Agency (KOSHA) intended to provide guidance to respirator program administrators on respirator selection. The purpose of this project is to suggest a preliminary respirator selection guide (PRSG) for the final guidance certified by KOSHA for the correct selection of respirators in the workplace. Materials: This PRSG was made on the based of current status of respirator usage including respirators available in Korea, foreign documents search and so on. PRSG was partially modified NIOSH pocket guide to chemical hazards, 3M Respirator Protection Resource Guide (RPRG) and OSHA Assigned Protection Factor (APF) rulemaking. Results: Respirators for chemicals having Korean Occupational Exposure Limits (KOELs) can be recommended in PRSG. For the others chemicals that have no KOELs, PRSG tells you what respirators you can select, using a simple step-by-step approach after health hazard assessment like HSE procedure. Conclusions: PRSG helps you to decide the right level of protection for a given hazardous substance and how to select the right respirators. PRSG is thus expected to reduce significant misuses of respirators for the work environment.

석유 및 석탄화학의 대보수작업중 벤젠노출 특성 비교

정은교 ( Eun Kyo Chung ),유계묵,신정아 ( Jung Ah Shin ),권지운 ( Ji Woon Kwon ),박현희 ( Hyun Hee Park ),정광재 ( Kwang Jae Chung ),이인섭 ( Seop In Lee ),강성규 ( Seong Kyu Kang ),류향우 ( Hyang Woo Ryu ),김영선 ( Yong Sun Kim ) 한국산업위생학회 2010 한국산업보건학회지 Vol.20 No.3

This study was conducted to investigate the benzene exposure levels in coal chemical and petrochemical refining industries during BTX turnaround (TA) processes where benzene was being produced. Three companies producing benzene were selected, one coal chemical and two petrochemical industries. TA processes were classified into three stages: shut down, maintenance, and start up. Data was analyzed by classifying the refining method into 2 groups (Petrochemistry, Coal chemistry) for 823 workers. Comparing the data from petrochemical industries with data from a coal chemical refining industry, while benzene concentration levels of long-term samples during TA were not statistically different (p>0.05), those levels of short-term samples were significantly different (p<0.001). About 4.79 % of data in petrochemical industries exceed the occupational exposure limits (OELs) of benzene, 1 ppm. In a coal refining methods, about 15.7% exceeded the benzene OELs. The benzene concentrations in maintenance and start up stage of TA for petrochemical refineries were higher than those in a coal chemical refinery (p<0.01). These findings suggest that the coal chemical refining site requires more stringent work practice controls compare to petrochemical refining sites during TA processes. Personal protective equipments including organic respirators should be used by TA workers to protect them from benzene over-exposure.