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Light Burned Magnesia의 水和性과 添加劑의 效果에 관한 硏究
鄭國三 연세대학교 대학원 1973 원우론집 Vol.1 No.1
A study was performed to investigate the hydration of light burned magnesia which was fired the magnesium compounds below 1250℃. In this study, the effects by the amounts of additive, firing temperature, soaking time, moulding pressure and relative humidity have been studied with a measurement of hydration ratio. Hydration ratio in several magnesium oxides obtained by thermal decomposition were measured by thermal gravity analysis and x-ray diffraction analysis. Magnesium hydroxide and magnesium carbonate were used as source materials, Fe2O3 and SiO2 were used as additives. As a result of study, additive, maturing temperature and relative humidity was reducing the hydration ratio. On the basic of this investigation, the optimum conditions were obtained when Fe2O3+SiO2, as additive, was added in 0.15+0.5%, maturing conditions was operated in the range of 1200℃, 1hr.
정국삼,홍광수 한국산업안전학회 1999 한국안전학회지 Vol.14 No.1
At present time, industrial accidents statistics are used as the basic data of the policy to prevent industrial accidents and the plan to applicate the industrial accident insurance. But this statistical data is not sufficient for the effective safety management because it is the expression of the itemized distribution and the frequency for the whole cases. This study tried to correlational analysis for each causes by defining investigational items as their accident parameters. The correlational analysis, between the unsafe action and status and their relational causes, was performed to analyze the occurrence causes of industrial accident. And to assume the severity of accident, the correlativity and independency between causes and direct causes which are defined hospital days subordinate parameter were analyzed. In addition, this study expressed numerically the effectiveness of subordinate parameters depended on the level of independent parameter by presenting the predictive model between dependent parameter and independent parameter, which have the categorical parameter, through the Logit analysis method.
정국삼,류영순 한국산업안전학회 1994 한국안전학회지 Vol.9 No.3
The purpose of this study is to compare the combustability of the formed high density polyethylene (HDPE) with the low density polyethlyene(LDPE). That is, the easiness of ignition is examined by using the methods with Oxygen Index(OI) Tester and ventilation parameter, and the combustion velocity of these potyethylenes is measured by changing the size and shape of opening area. As the result of it, the oxygen index of HDPE, in a ignition, is required more than LDPE. Then, the concentration distribution of CO by combustion is increased when the opening area is small, but, in the same opening area, LDPE tends to increase more than HDPE. In addition, as the ratio of height to width of opening area is increased, combustion velocity becomes faster relatively. In consequence, when it is generally considered, the combustability of LDPE is better than HDPE.
정국삼 한국산업안전학회 1993 한국안전학회지 Vol.8 No.1
This paper was concerned with the risk assessment about oxidizing substances as dangerous goods by burning test method. The sample, which was formed with the heaped cone-shape, was composed of solid oxidant and sawdust. The burning time of each sample was measured under the following various conditions: circumstance temperature, mixing ratio of oxidizing substance and sawdust particle size of sawdust and kinds of sawdust. As a results the effective combustibility was gained when the sawdust content was 20∼30 wt.% in the sample and the lauan with -30+50 mesh was used. But, although the circumstance temperature increased, burning efficiency of the samples were not affect by it. Finally, the average burning times were obtained by considering the weighting factors related on the mixing ratio and the circumstance temperature. And then, it were compared with the combustion risk level and the effects of cation and anion of oxidizing substances as dangerous goods.
정국삼,강민호 한국산업안전학회 1997 한국안전학회지 Vol.12 No.3
This paper was concerned with temperature aspect in the smoldering time of the accumulated each saw-dust sample of larch, oregon, aromatic trees which was formed with heaped cone-shape. The smoldering time and temperature of each sample was measured under the wind velocity of 0.10∼0.15m/s and circumstance relative humidity of 60%. As a result, the very lowest heat beginning temperature was detected in aromatic. The effective smoldering phenomena in the sample were detected when the larch saw-dust of [-20+40mesh] and the aromatic saw-dust of [-40+50mesh, -50+60mesh]. Finally the larger a particle size of saw-dust was the better a smoldering time was short. Also, it showed more increasing temperature above 70% in the smoldering reaction.