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한돈희 인제대학교 1999 仁濟論叢 Vol.14 No.3
Most of manufacturers try to produce the most efficient filter for respirators with the lowest breathing resistance. Filter performance depends on the low penetration, i.e., the high efficiency (%), and pressure drop (mmH2O). This study was performed to suggest the direction for development of good performance of mechanical filters for respirators and filtering facepieces. Two mechanical filters, S and K made in Korea, three filtering facepieces, S made in China, C made in Korea and M made in USA, which were widely used in the workplace were selected and tested efficiency and pressure drop in accordance with flow rate, using with Automated Filter Tester Model 8110 (TSI, USA). It was necessary for mechanical filter S to lower pressure drop without increasing efficiency, but mechanical filter K should be increased efficiency and decreased pressure drop. While filtering facepiece M had the best quality performance of three ones, S and C should get much higher efficiency and lower pressure for better performance.
石灰, Fly Ash 및 볏짚재가 土壤에서 무우로 移行 蓄積되는 카드뮴과 납의 含量 減少에 미치는 影響
韓敦熙 인제대학교 1992 仁濟論叢 Vol.8 No.2
Greenhouse pot experiments were conducted to evaluate the effects of lime, fly ash and ash(from rice straw) on the cadmium and lead translocation from soil to radish. The soils with low metal contents(Cd 1.52 ppm and Pb 25.37ppm) were prepared and high metal contents (Cd 8.99 ppm and Pb 50.81ppm) were prepared and amended with 0.25%, 0.5%, 1.0%, 2.0% each of lime, fly ash and ash. Radishes(Raphanus sativus) were cultivated and cropped on the soils during 25, 50 and 75 days after sprout, and then cadmium and lead contents of radishes were analyzed by roots and tops. The results obtained are as follows. 1. Lime and ash were effective in raising the soil pH, but fly ash was not effective. 2. The growth of radishes were not impaired by the cadmium and lead contamination but, impaired by soil pH 7.5 or more. 3. Cadmium was accumulated very strongly in radishes and the greater concentration was found in tops than roots, but lead showed no evidence of accumulation in radishes. 4. In general, when the concentrations of lime and ash in soils increased, the uptake of cadmium and lead by radishes decreased, and lime was more effective than ash, while fly ash revealed no effect of reducing the translocation of cadmium and lead from soils to radishes. 5. The uptake of cadmium by radishes decreased more effectively than lead and the uptake of Cd or Pb by radishes grown in the soils with high metal contents decreased more effectively than low metal con tents. 6. Cadmium and lead contents of radishes were negatively correlated with soil pH values and the relationship in cadmium content was stronger than that in lead content. KEY WORDS : Cadmium, Lead, Translocation, Reduction, Lime, Fly Ash, Ash, Radish
釜山市 地下商街와 그 地上空氣中 呼吸性 粉塵 및 重金屬 濃度에 관한 比較 硏究
한돈희 인제대학교 1991 仁濟論叢 Vol.7 No.1
This study was performed to analyse the differences of suspended particulates, heavy metals between aboveground and underground at 3 underground-markets, and to assist in controling the indoor air pollution at underground-markets in Pusan. Air sampling was fulfilled at 12 points(6 points aboveground, 6 points underground) from December 11 to 22 in 1990. The results are as follows ; 1. The aboveground levels of total suspended particulates(TSP) and respirable dust were revealed higher than underground, and all were very severe. 2. On the whole, the level of respirable dust was increased in proportion to the level of TSP and the proportions of respirable dust to TSP were 72% aboveground, 78% underground. 3. In general, the levels of heavy metals were not severe.
가스흡착력의 원리에 의한 CS₂의 활성탄관 파과현상에 미치는 시료채취속도의 영향
李鎭憲,洪仁錫,韓敦熙 인제대학교 1994 仁濟論叢 Vol.10 No.2
The purpose of this study was to determined the effects of flow rates on breakthrough in charcoal tubes. Firstly the charcoal tubes were contaminated with CS2, and then the effects of them were examinated by using the principle of Gas Adsorption Kinetics. The results obtained were as follows. 1) As the flow rates were increased, k'-values were increased, τ-values were decreased, and k'-values were constant as 3.527±0.558. 2) 10% breakthrough times of 0.05, 0.1 and 0.2LPM were 149, 90 and 34 min, respectively. 3) As the probability of breakthrough were increased, the effects of sampling flow rate against the breakthrough time were proportionally increased.
Determination of Parathion Metabolite, p-Nitrophenol in Urine of Parathion Factory Workers
Han, Don-Hee,Jung, Dong-Gyun,Shin, Ho-Sang Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
Parathion is an organophosphate pesticide being legally applied for the purpose of agriculture and is being manufactured in Korea. A gas chromatography/mass spectrometric method was developed for the determination of parathion urinary metabolite, p-nitrophenol. p-Nitrophenol was extracted from weak acidic urine, and then measured by gas chromatography-mass spectrometry (selected ion monitoring). The recovery of pnitrophenol in the overall procedure was 88.2%. The detection limit of the assay was 1.0 $\mu$ g/L based upon assayed urine of 2.0 mL. The method was applied to the determination of p-nitrophenol in urine of workers of a parathion industry. Spot urines of workers of a parathion industry were sampled at the end of shift and pnitrophenol was analyzed using above developed method. p-Nitrophenol could be detected in all of the urine samples at concentrations varying from 3.0 to 681 $\mu$ g/L.
사고대비물질 개인보호구 선정에 관한 연구(1):: 물질유해성 및 작업위해성 분석
한돈희(Don-Hee Han),정상태(Sang-Tae Chung),김종일(Jong-Il Kim),조용성(Yong-Sung Cho),이청수(Chung-Soo Lee) 한국환경보건학회 2016 한국환경보건학회지 Vol.42 No.6
Objectives: According to the new Chemical Control Act from the Korean Ministry of Environment (2014- 259), workers handling hazardous chemicals should wear personal protective equipment (PPE). However the act simply states in basic phrases that every worker handling one or more of the 69 listed chemicals should wear PPE and does not consider the unique hazard characteristics of chemicals and work types. The main purpose of this study is to provide basic data to revise the act to suit particular work processes and situations. Methods: The hazard rank of the substances was classified based on hazardous characteristics such as LC50 and vapor pressure using matrix analysis. The workplace exposure risk of the substances was also determined through a matrix analysis based on the previously determined hazard ranks and the demands of manual handling together with the likelihood of accident frequency of the operation combined with the exposure of workers during spill accidents. Results: To meet the demands for developing subsequent guidelines for the risk-based application of PPE in hazardous workplaces, this study sorted the 69 listed chemicals into five hazardous categories based on their LC50 and vapor pressures, and also assigned exposure categories according to exposure vulnerability for various types of work which are frequently performed throughout the life cycle of the chemicals. Conclusion: In the next study, an exposure risk matrix will be produced using the hazard rank of chemicals and workplace exposure risk, and then PPE will be selected to suit the categories of the exposure risk matrix.
유해화학물질 취급자의 개인보호구 착용에 대한 규정과 그 이행정도
한돈희(Don-Hee Han),박민수(Min Soo Park),조용성(Yong-Sung Cho),이청수(Chungsoo Lee) 한국환경보건학회 2021 한국환경보건학회지 Vol.47 No.1
Objectives: The objectives of this study are to introduce the development process of work situations and types in the revised regulations on wearing personal protective equipment (PPE) for hazardous chemical handlers, analyze the implementation of the regulations, and then provide basic data for future education strategies. Methods: The development process of work situations for regulation was explained through a flowchart by year. In 2018, a survey of 30 chemical managers and 201 managers and handlers was conducted based on recognition of work situations and the related regulations. In 2019, 91 chemical managers and 204 handlers were surveyed to find the degree of compliance with regulations, direction for improvement of understanding the regulations, and training methods. Results: Only 78.0% of chemical managers and 66.7% of handlers said they were aware of the regulations (p<0.05). Just 79.0% of handlers knowing the regulations said they would wear PPE in compliance with these regulations. Therefore, the best way to make workers wear proper PPE in accordance with regulations is to strengthen the promotion of education on regulations. In order to improve the quality of education, 51.7% of managers and 33.3% of handlers cited educational content (video, ppt, etc.) as the top priority. Conclusion: This study suggested that more educational opportunities should be provided and educational content should be developed in order for workers handling hazardous chemicals to wear PPE as prescribed in regulations.