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尹明照,李振榮,張承壁,金泰淵 최신의학사 1967 最新醫學 Vol.10 No.5
The concentration, size distribution, shape characteristic of suspended dust and silica (Si02) content in rock taken at ordinary and special sinking place where have different condition of ventilation of the coal mine were studied and obtained following results: (1) The concentration of dust in each ordinary and special sinking places of the coal mine was 487.7 and 191.0. mppcf respectively. (2) The concentration of silica in rock in each places was 37.10/6 and 41.0% respectively. (3) The size of suspended dust was distributed to 31.8% . at less than 0.5p, 67.2% at the range of 0.5-3p, .1.0% at the range of 3-5,u and almost none at the size o .more than 5,u. This means that the fine dust (0.5-5.0,u) which capable to reach deep lung was 68.2%. (4) Many sharp edge dust was observed among the suspended dust as shown in Fig. 1. (5) Accordingly, dust environment we studied are considered as harmful condition to worker, and the appropriate measure to prevent producing dust was discussed
尹明照 최신의학사 1975 最新醫學 Vol.18 No.2
In this paper, the hazardous environmental factors which affect the health of steel workers, such as the location of the scaffing process in iron and steel manufacturing and the changes in physicial work activities have been compared to the loss of extrarenal fluid of 19 healthy labours. The average age of the workers was 28.8 years, ranging from 25 to 40 years. The indexes of heat stress in the working environment exceeded the maximum allowable limit for industrial safety. The mean indexes are as follows: discomfort index (DI) =129.2, kata cooling power =8.9, heat stress index (HSI) =200. The density of dust was 915mg/m', which is more than 60 times the maximum allowable level as determined by the ACGIH. of the 19 subjects, 13 of them experienced a sweating rate (% of extrarenal fluid loss to body weight) of more than 3%.