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Silica Gel-MoO₃觸媒에 의한 Methanol의 酸化反應
김재구,정국삼,홍윤명 연세대학교 산업기술연구소 1983 논문집 Vol.15 No.2
The vapor phase oxidation of methanol to formaldehyde over silica gel supported-MoO₃catalyst was studied at atmospheric pressure as a function of reaction temperature, feed rate and concentration. The silica gel supported-MoO₃catalyst was found very selective in formaldehyde formation but conversion was rather poor. The following rate equation was deduced assuming a steady state with two stage irreversible oxidation-reduction process. γ= ? The rate equation matched experimental data reasonably well and activation energies of the steps were calculated to be 8.345Kcal/g-mole and 7.074Kcal/g-mole respectively.
지경택,송영호,정국삼 한국산업안전학회 2002 한국안전학회지 Vol.17 No.1
This study aimed to search for the fundamental accident causes using a categorical analysis, a kind of statistical methods. As the analysis methods, correlation analysis, independence test and logistic regression analysis were used. And the SPSS package, a general - purpose mathematical library, was used to obtain statistical characteristics. As the result of this study, the accident causes associated with factor of 'lost working days' were factors such as 'employed periods', 'sex', 'types of accident', 'month'. In case of applying independence test method, the most important cause was the factor of 'month'. In case that logistic regression analysis method was applied, the cause contributed to the increase of occurrence probability of major injury were factors such as 'suffocation & intoxication', 'temporary construction structure', 'less than 6 month'. On the basis of these results, the plan for accident prevention and the proper investment for accident prevention expenditure could be carried out in each workshop.
송영호,강민호,정국삼 한국산업안전학회 2003 한국안전학회지 Vol.18 No.1
The purpose of this study was to review the factors that influence on the combustion experiment of oxidizing solid such as mixing ratio of oxidizing solid and combustible support, content ratio of oxidizing solid, ambient temperature, maturing time, combustible support, and additives. The 30g mixing compound samples of oxidizing solid and combustible support were tested with different mixing ratios. As a result, the fastest burning time was measured when mixing ratio was 4 (oxidizing solid) : 1 (combustible support). And the burning time was decreasing as the ambient temperature and maturing time were increasing.
Limonene - Expanded Polystyrene 혼합물의 자연발화 특성
송영호,하동명,정국삼 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1
감용제 limonene을 이용하는 EPS 자원 재활용 공정에 있어서, limonene - EPS 혼합 액체의 저장 · 취급시의 화재위험성 평가에 대한 기초 자료로 제시하고자 혼합물의 농도 및 시료량의 변화에 따른 최저발화온도를 측정하였고, 발화와 비발화 영역을 비교하였다 발화온도를 예측하는데 있어서 가장 과학적인 원리로서 이용되고 있는 발화 지연 시간, 활성화 에너지 및 발화온도의 관계식을 선형회귀분석을 이용하여In t= 0.704/T -5.819로서 제시하였다. 또, 가연성 혼합물의 농도 변화에 따른 발화위험성을 예측하기 위하여 혼합물의 농도와 발화온도의 관계식을 비선형회귀분석을 이용하여 T_(m)=248.32+69.27X+172.60X²로서 제시하였다. 그 결과, 발화 지연 시간과 발화온도와의 관계식 및 혼합물의 농도와 발화온도와의 관계식에 의해서 limonene - EPS혼합물의 발화온도의 추정이 가능하게 되었다. In the reutilization process using limonene, the organic solvent to reduce volume of EPS, the AIT was measured with the variation of concentration and volume of mixture, in order to present the fund-mental data on the fire hazard assessment of limonene - EPS mixture at storage and handling. And ignition zone was compared with non-ignition zone. The equation related to AIT, activation energy and ignition delay time, used by the most scientific basis for predicting AIT values, was suggested using linear regression analysis as In t = 0.704/T - 5.819. And the equation related to concentration of mixture and AIT was also suggested to predict ignition hazard of combustible mixture using nonlinear regression analysis as T_(m)= 248.32 + 69.27X + 172.60X², It enabled to predict ignition temperature according to variation of ignition delay time and concentration of mixture by the suggested equations.
송영호,강민호,정국삼 한국안전학회 2004 한국안전학회지 Vol.19 No.1
The purpose of this study was to examine effects of combustion retardation for paper filter impregnated metal salts by measurement of extinguishing concentration, CO concentration, and limiting oxygen index(LOI, ASTM D 2863). And thermal stability analysis using DSC was carried out. In case of extinguishing concentration, NH₄H₂PO₄ showed excellent effect of combustion retardation. The result of LOI measurement showed that metal salts possessed good effect of combustion retardation. And thermal analysis using DSC showed that these metal salts possessed thermal stability. In case of CO concentration, CO concentration was increasing because of imperfect combustion process due to combustion retardation effect of metal salts.
정국삼 한국산업안전학회 1992 한국안전학회지 Vol.7 No.3
This paper was concerned with the risk evaluation of oxidizing substances by burning test method. The samples were prepared the heaped cone-shaped mixtures of solid oxidizing substance with sawdust, and ignition of the sample was made on contact with heating wire inside the combution chamber that the temperature and humidity of atmosphere can be kept at 25℃ and 60% respectively. Accordingly, it were measured the combustivity effect of mixing ratio and amount of sample weight on the burning rate. As a result of burning test of these samples, it could be noticed that the case when the sawdust has so and 30 wt.% in the mixing ratio shows effective combustivity, and as the amount of sample weight was increasing, it showed more rapid burning time. So the average burning time could be obtained by considering the weighting factors to the parameters of the mixing ratio and the amount of sample weight. Finally, it was compared with the effects of cation and anion of oxidizing substances and also applied analytically to the classification and evaluation of oxidizing substances as dangerous goods.
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.