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이내우,김성빈,박희련,디노피사니엘로 한국산업위생학회 2000 한국산업보건학회지 Vol.10 No.2
This study was performed to evaluate tannin exposure by woodcuts for workers in furniture factories and to investigate the relationship between tannin exposure and sino-nasal cancer risk. In order to explore possible cytological changes leading to nasal cancer, we have examined 50 male furniture workers and 50 matched controls using brush cytology. The results we have obtained in this study were as follows: 1. The tannin contents of woods used in woodworking factories have been measured and varied from 0.43 to 8.72 ㎎ tannic acid equivalent per gram wood, for reconstituted softwood and turpentine (Syncarpia glomuliferia) respectively. 2. Airborne tannins in woodcuts were also determined by area and personal exposure. The values of mean exposures for bath methods are ranged from 3.1 to 5.0 ㎍/㎥ and from 4.6 to 14.5 ㎍/㎥ in furniture manufactures. 3. Over nasal cytology scores 2, the scores of study group were slightly more than control group and this kind of metaplasias seemed to be occurred over 2 ㎎/㎥ woodcuts and 6 ㎍/㎥ tannin exposure. Keratinising squamous metaplasia was investigated at nasal cytology score 3 and 10 ㎍/㎥ tannin exposure. The nasal cytology score 4 was seemed to be atypical squamous metaplasia. 4. To find out contributing factors to nasal cytology change, odds ratio that is one of fundmental biostatistics was applied. Actually the relationship between woodcuts, tannin concentration and metaplasia were not meaningful, but the relationship between working experience more than 15 years and metaplasia was calculated as 1.83. This reveals that significant clinical abnormalities could be influenced from the years of woodworking experiences. However further research is required to evaluate the significance of the data, for the purposes of sino-nasal risk assessment, standard setting to prevent nasal cancer occurrences and possibility of changing workplace.
이내우,최재욱,설수덕 한국산업안전학회 2002 한국안전학회지 Vol.17 No.2
This study is the series of photopolymerization on alkyl methacrylate(AMA) to continue further research. The objective of this work is to investigate the environmental fraternitive characteristics of photopolymerization kinetics on n-Buthyl methacrylate(BMA) and comparing the decomposition behavior to other AMA. The experiment was done in aqueous solution under the influence of photo-initiator concentration(0.05~0.25㏖/l), light intensity(5000~9000??/㎠) and monomer concentration(2.0~6.0㏖/l). n-BMA was polymerized to high conversion ratio using hydrogen peroxide(H_2O_2), and the kinetics model we have obtained is as follows. R_p=k_p[S]^0.24[M]^0.33[L]^1.53exp^(27.19/RT) The differential method of thermogravimetric analysis(Friedman method) was used to obtain value of activation energy on decomposition reaction. The average value of it was 27.5㎉/㏖.
DSC 에 의한 고분자물과 나트륨아지드 혼합물의 열안정성에 관한 연구
이내우,박준조 한국산업안전학회 1997 한국안전학회지 Vol.12 No.2
If sodium azide is impinged by certain reasons, it will be produced explosives by heavy metals and toxic materials. But it is used propellent for inflating automotive safety bags and the other chemical manufacturing purpose. The investigation of thermal hazard potential of sodium azide itself and with polymers are very important because some parts of automotives, transporting vessels of reactive chemicals and many any other constituents of structures in factories are made of polymers. The range of decomposition temperatures are about 360∼380℃, even if it depends on heating rate and sample weight. Thermal decomposition heat of sodium azide in air is higher than in nitrogen atmosphere, because the former is included oxidizing heats of sodium metal which is made by decomposition of sodium azide to end. Especially decomposition temperature of polymers are increased on the order of bonding energy between atoms in hydrocarbon moleculars.