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文榮漢 中央醫學社 1977 中央醫學 Vol.33 No.3
Unwanted noise produces various effects in the human being through autonomic nervous system. Disturbed peripheral circulation,. elevation of blood pressure, metabolic and humoral changes, sleep disturbance, enhancement of fatigue, lowering of work-efficiency and other psychopathologic changes are known to be caused by noise. Sensory-neural hearing impairment is seen as C;-dip mainly in the range of 4 KHz which is above the range of the conversational frequencies. Therefore early detection of noise induced hearing impairment is difficult. The present study was performed at the six major industrial factories in the Kyung-In (Seoul and Inchon) areas. Analysis of environmental noise and audiometric survey was done among 1,970 workers and analyzed according to the types of the industry. The result obtained was as follows: 1. The workers were composed of 1, 326 men and 644 females. Female workers were mostly of textile industry whereas machinery and steel industries comprised most male workers. 2. Average age was high (34.7 years) among the machinery and steel workers and lowest (22.2 years) was textile workers. 3. Average duration of employment was high (5.5±4.7 years) among the machinery and steel industries and low (2.4±1.7 years) among the textile industry. 4. Hearing impairment was higher among the machinery and steel industries in the separate ears (Rt. 42.3±19.6) (Lt. 42.9±20. 1). Average hearing impairment was also higher among the machinery and steel workers (Rt. 9.9±13.6) (Lt. 10.7±15.3). No significant changes were found between right and the left ear. 5. Relation between duration-of employment and hearing impairment apply mg Early Loss Index (ELI) was significantly parallel with increased D and E. 6. Pure rate of noise-induced hearing impairment applying ELI was 29% and 31% in the right and the left ear respectively.
1996년도 소음성난청 유소견 근로자들의 청력역치 관련 기초조사
문영한,이상렬,이경남,안연순,Moon, Young-Han,Lee, Sang-Yeal,Lee, Kyung-Nam,Ahn, Yeon-Soon 대한예방의학회 1999 예방의학회지 Vol.32 No.1
Objectives. This study was carried out to analyze the hearingthreshold levels and relating factors of 1,048 workers with noiseinduced hearing loss$(D_1)$. Methods. We analyzed the hearing-threshold levels and relating factors of 1,048 workers with noise-induced hearing loss$(D_1)$ examined by the summary reports of specific health examination results of industries and personal reports of specific health examination results reported by 58 specific health examination institutes and 8 secondary pneumoconiosis examination institutes in 1996. Results. Among 1,048 workers at 510 workplaces, male workers were 1,009 (96.3%) and female workers were 39 (3.7%). The mean ages of workers initially exposed to noise and at present were 28.7 and 47.2, respectively. The duration of total exposure was 16.5 years. Average hearing-threshold levels analyzed by three-divided classification of the study subjects were 43.7dB(Lt) and 42.6dB(Rt). Those analyzed by six-divided classification were 50.5dB(Lt) and 48.6d8(Rt). Among workers with noise-induced shearing loss$(D_1)$, 16.3% was unilateral hearing loss and 84.6% was classified to compensation case. 8.8%(Rt) and 10.2%(Lt) of them were suspected to be conductive hearing loss by differences of air-bone hearing-threshold levels. Hearing-threshold levels of workers in manufacturing industry were significantly increased during the short exposure compared with the levels in mining industry. Among manufacturing industries, hearing-threshold levels of workers in trailer and other transportation equipment manufacturing industry were significantly increased. Age and duration of total noise exposure were not significantly related to the average hearing-threshold levels analyzed by three-divided classification. Hearing-threshold levels of female workers were significantly increased during the short exposure compared with those of male workers. Hearing-threshold levels of workers at the high risk group, ages of 20s, 30s and total exposure duration of less than 10 years, were not significantly increased compared with those of the other groups. However, they were exposed at young ages. The 3 leading industries of workers at high risk group were trailer and other transportation equipment manufacturing, automobile manufacturing and assemble-metal manufacturing industries. Conclusions. This study was the first nationwide analysis of the hearing-threshold levels and relating factors of workers with noise. induced hearing loss$(D_1)$. We found the differences of the real number by the statistics of the department of labour and the expected number of worker' s compensations for occupationally-induced hearing loss estimated by this study. According to the results of this study, we should carefully examine the methods to narrow this difference.
문영한,노재훈,Moon, Young-Hahn,Roh, Jae-Hoon 대한예방의학회 1986 예방의학회지 Vol.19 No.2
Subjective symptoms, counts of blood cells and liver function test were conducted on 198 male workers who were exposed to toluene in Kyungin area from September to November, 1986. According to the level of urinary hippuric acid concentration, the total sample was classified into the high exposure group ($concentration{\geqq}3g/1$) and the low exposure group(concentration<3g/1). The following findings were obtained by comparing the two group: 1) Contrary to the previous findings. the urinary hippuric acid concentration of toluene exposed workers showed bimodal distribution. It meant that the toluene exposed workers were mixed with the non-exposed or minimal exposed workers. 2) The high exposure group showed a lower level of leucocytes counts ($6,630{\pm}1,860{\mu}l$) than the low exposure group ($6,340{\pm}1,960/{\mu}l$). 3) The high exposure group showed a higher level of SGOT, SGPT and r-GTP than the low exposure group (p<0.05). 4) The high exposure group complained much more subjective symptoms (e. g. skin rash, loss of appetite, palpitation) than the low exposure group.