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일부 밀폐형 무창계사에서 발생하는 PM<sub>10</sub> 및 엔도톡신의 특성 및 연관성 분석
김효철 ( Hyocher Kim ),신소정 ( Sojung Sin ),김경수 ( Kyungsu Kim ),정원건 ( Wongeon Jung ) 한국산업보건학회 2021 한국산업보건학회지 Vol.31 No.4
Objectives: The aim of this study was to evaluate the concentrations and relationships of coarse particles with a diameter of 10 μm (PM<sub>10</sub>) with endotoxins according to the time of measurement in windowless poultry houses. Methods: In this study, measurement was performed on ten windowless poultry houses with a vertically integrated system from July to November. PM<sub>10</sub> was measured using personal environmental monitors and polytetrafluoroethylene (PTFE) filters with a 4 L/min-calibrated pump in selected sampling locations (two near the door and two near an exhaust fan). The endotoxin on PTFE filter was analyzed by the LAL turbidimetric method. Results: The range of geometric mean concentrations of PM<sub>10</sub> and endotoxins for each of the 38 samples were 0.12-3.30 mg/㎥ and 11.9-3553.66 EU/㎥, respectively. PM<sub>10</sub> and endotoxin concentrations varied by farm, increasing with the decrease in ventilation. The range of the coefficient of determination between PM<sub>10</sub> and endotoxin was 0.0009-0.9249. As the atmospheric temperature decreased, it was confirmed that the concentrations of PM<sub>10</sub>and endotoxin increased because the volume of ventilation was decreased. Conclusions: Endotoxins were more affected by time of measurement and ventilation than PM<sub>10</sub>, which means that endotoxins could be an important indicator for intervention programs for improvement of indoor environments.
직독식 기기를 이용한 양돈작업자의 신체부위별 PM<sub>10</sub> 노출 특성 비교 연구
신소정,김효철,김경란,서민태,박수인,김경민,김경수,Sin, Sojung,Kim, Hyocher,Kim, Kyung-ran,Seo, Mintae,Park, Sooin,Kim, Kyungmin,Kim, Kyungsu 한국산업보건학회 2019 한국산업보건학회지 Vol.29 No.2
Objectives: The purpose of this study was to evaluate the personal exposure to $PM_{10}$ by body parts for the development of dust monitoring wearable device for swine farmers. Methods: Tasks were classified by using motion pictures taken by action cameras attached to swine farmers. Concentrations of $PM_{10}$ were measured by attaching direct-reading instruments at the head, neck and waist of worker. Differences of $PM_{10}$ exposure between body parts were analyzed with linear regression. Results: We identified three tasks(vaccination, moving pigs, and manure treatment). $PM_{10}$ concentration during vaccination was the highest among the tasks, and the body part showing the highest concentration of $PM_{10}$ was the waist regardless of task. In all tasks, the closer distance between the body parts, the higher were the R-squared values(vaccination 0.4221, moving pigs 0.6990, and manure treatment 0.2164). Conclusions: We presumed that $PM_{10}$ concentrations were affected by the parts of the body in which they were measured. In order to develop swine farmer's wearable device for monitoring dust concentration in air, the determination of the positions of monitoring sensor to ensure accurate measurement is essential. Considering the results of this study, wearable sensor should be positioned at the waist.
작업자세와 작업시간을 고려한 농작업의 인간공학적위험성 평가 방법의 제안
박희석,이윤근,김효철,이경숙,Park, Hee-Sok,Lee, Yun Keun,Kim, Hyocher,Lee, Kyungsuk 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.5
Objective: A method to assess the risk level of agricultural works considering work posture and working time was suggested, and the method was applied to the major fruit crops. Background: It is not complete to analyze only work postures when assessing risk level of agricultural works. Method: $3{\times}3$ matrix was employed, in which the severity level was taken from the REBA method and exposure level was taken from the working time, using the criteria of caution zone/hazard zone. Results: Among the 5 major fruit crops(apple, pear, grape, peach, persimmon), the highest level of ergonomic risk was found in the apple and pear, while medium level was found in other 3 crops, mainly because the working time was less in the 3 crops. Conclusion: It was found that when assessing the overall ergonomic risk of agricultural works, work posture and working time should be considered at the same time. Application: The suggested method could be applied to other non-cyclic tasks.