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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Safety
Journal Basic Information
Journal DOI :
The Korean Society Safety
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Volume & Issues
Volume 7, Issue 4 - Dec 1992
Volume 7, Issue 3 - Sep 1992
Volume 7, Issue 2 - Jun 1992
Volume 7, Issue 1 - Mar 1992
Selecting the target year
A Study on Performance of Engine Combustion and Emission Using Gasoline-Methanol Fuel in Sl Engine
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 3~13
In recent years, the study about the high efficiency and low fuel consumption of the internal conbustion engine has been mainly proceeding. To achieve these goals, the improvement of combustion process in Sl engine and the use of substitute energy are suggested. When the methanol blend fuel Is used, the combustion rate of the initial ignition is diminishing by high latent evaporation of methanol. But it attracts the attention because of the high octane number, and lean mixture peculiarity. Considering these facts, the gasoline-methanol blend fuel In engine operation has been used to compare and analyze the pressure development, rate of heat release, mass burned fraction, and combustion process. The results of experiment show the power increase, lean combustion and low harmful component of emission.
Smouldering Combustion of Cellulose Insulation and Its Transition to Flaming Combustion
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 14~21
The smouldering combustion of cellulose insulation treated with boric acid-borax-alum as combustion retardants are examined by Candle type combustibility tester. This sequence was examined quantitatively for longitudinal cylinder bed of cellulose insulation. Two configuration are possible, downward and upward smoulder spread ; both were investigated exprimentally. The smoulder spread velocity of cellulose insulation was 2.5cm/s -5.0cm/s in smoulder region. As results of critical oxygen content measurement, the effectiveness of alum as third combustion retardant are acceptable for flaming retardant effect. The phenomena of combustion transition are governed by quantity of commbustible gas generation In heating zone of cellulose insulation. The critial oxygen content are decreased with the increase of gas flow rate.
The Growth Inhibition of Staplylococcus aureus in Emulsion Type Cosmetics with Antiseptics
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 22~29
Emulsion-type cometics contain many kinds of carbon and energy source i.e., vegetable oil, mineral oil and carbohydrate etc., those can be used as nutrients and caused contamination by microbials. Thereby we have to keep cosmetics from the possibility of contamination by microbials. From this viewpoint, the purpose of this study is to get the data necessary not only to prevent dermatopathia occurred by microbials but also to sustain the quality. In this experiment, we observed how many Staphylococcus aureus were grown in the prepared cosmetics with or without antiseptics so as to prevent contamination. When the contamination proceed, the stability of phase was disturbed and creaming phenomina was happened with some discoloration and bad smell. About 40 days after, the pH was changed from 7.6 to 6.5 and the refractive index of cosmetic raw materials were changed from 1.4415 to 1.4490(water : oil=70:30). By adding antiseptics Into prepared cosmetics, the number of Staphylococcus aureus with challenge test method were decreased to 7
103 cell/ml. For the antibacterial effect against Staphylococcus aureus, p-hydroxy benzoic acid propyl ester in phosphoric acid buffer solution was the best.
A Study of Field Survey on Working Environment for Mercury Treatment Establishments in Korea
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 30~34
This study is conducted to evaluate the airborne concentration of mercury, as well as installation and efficiency of local exhaust ventilation system for 57 factories manufactured fluorescence lamps, mercury lamps and thermometers for July and August 1990. Results and conclusion are as fellows : 1) Mercury treatment factories are 32 among 57 ones, which are 18 fluorescence lamp manufacturing ones and 6 mercury lamp ones and 3 thermometer ones and 5 other ones. 2) Mean airborne concentrations of mercury for factories manufactured mercury lamps are 0.01 mg/ ㎥ in injection process and 0.0155mg/㎥ in exhaust process, and mean airborne concentration of mercury for factories manufactured thermometer are 0.023mg/㎥ in injection process and 0.012mg/㎥ in selection process. All of these airborne concentrations of mercury are lower than PEL(Permissible Exposure Limit ), 0.05mg/㎥. 3) Mean airborne concentrations of mercury for factories manufactured fluorescence lamps are 0.094mg/㎥ in injection process and 0.087mg/㎥ in exhaust process, and 0.052mg/㎥ in sealing process and 0.085mg/㎥ in other process, respectively. All of these air borne concentrations of mercury are exceeded to PEL. More than 60% among 32 factories manufactured mercury are exceeded to PEL. 4) Nine factories among 18 factories manufactured fluorestence lamps are equipped with local exhaust ventilation system, and 7 factories among 9 factories are required for the improvement of suction capacity and structure. Five factories among 14 factories manufactured mercury lamps and the other ones are equipped with local exhaust ventilation system, and 2 factories are required for the improvement of suction capacity and structure.
Iginition energy effects and noxious product gases of combustible premixed gas in closed space
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 35~42
Ignition energy effects of concentration of mixed gas In closed cylindrical vessel(1, 832㎤) are studied. The ignition energy ranged from 25 Joule to 110 Joule, and hidrogen and methane gases were used for flammable gas at stoichiometric condition with oxygen gas and nitrogen gas (N2) was for inert gas, which concentration was maximum 60% . The explosion pressure, temperature, concentration of product gases were calculated. It is found that - The explosion pressure and explosion velocity increase with ignition energy. - The gradience of explosion velocity with ignition energy is steeper than explosion pressure. - The results of calculation are similiar with results of experiment. - NOx is not serious product gas for methane and hydrogen gas, but CO is serious at certain concentration for methane in asphyxiation.
건설안정성 평가의 정량화에 관한 연구
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 43~52
This research presents how to make more efficient management for preventing accidents in construction site. One of the most efficient way to do so is to quantify those potential hazards and risks, resulting from it. Also it has been tried to rate & weigh each Item of those hazards, depending on the degree of risk. The goal if this qualification method is to establish ensuring the required safety. These are rated & compared with the degree of understandings of each item & accomplishment of those codes.
Estimation of Flash Points of Flammable Liquid Mixtures with Non-flammable Liquids
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 53~59
A general theory is developed which enables closed-cup flash points of mixtures of flammable and non-flammable liquid to be estimated from a knowledge of a certain properties of flammability diagram by thermodynamic method. The estimated equations is shown the effect of both the flame inhibiting properties of the vapor of the non-flammable component and the relative volatility of that component. The vapor phase flame inhibition effect results in a even greater elevation of flash points than the rotative volatility of that component. Especially in cases of similar vapor phase flame inhibition of the non-flammable component, the rotative volatility is affected greater elevation of flash points(extinguishing effect).
컴퓨터 터미날 감시작업의 난이도 평가에 대한 연구
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 60~65
As many industrial workers have been involved with computer terminal tasks, for example, monitor ing, inspection, or computer da4a entry etc., concerns for difficulty evaluation of computer terminal tasks are Increased. This study provides that eyeblink can be used as a means of difficulty evaluation of a computer terminal lask. Four subjects without color blindness are asked to perform the monitoring task of the binary choice type under five levels of task difficulty. In each task, eyeblink rates and eyeblink interval times were measured from the subjects. The results show that the eyeblink rate does decrease with an Increase in task difficulty. In addition, it was found that both eyeblink interval time and eyeblink Interval time variation increased with an increase in task difficulty. It was concluded that the change of eyeblink rate, eyeblink interval time and eyeblink interval time and eyeblink interval time variation could be regarded as a generalized response to the imposition of task difficulty.
A Study on The Explosion Characteristics of Flammable Gases
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 66~72
An experimental study was carried out to analyse the explosion characteristics of flammable gas-air mixtures. Used flammable gases were hydrogen, methane, acethylene, ethylene and pro-pane, explosion Pressure, explosoin pressure rising rate, and flame propagation velocity were measured experimentaly. The maximum explosion pressure and rising rate of flammmalbe gas air mixtures were appeared at the range of slightly higher concentration than the stoichiometric concentration. Initial pressure before explosion was controlled from 0.6 to 2.0kg/cm absolutly. Explosion pressure was increased with increment of the initial pressure, and the relationship between initial pressure and explosion pressure was Pe = KPi. The effect of vessel size on explosion characteristics was also analysed In this experiment. Explosion pressure was increased with in-creasing the vessel size, otherwise explosion pressure rising rate was decreased. When we locate a dummy material in vessel explosion pressure was decreased with increasing the dummy volume but exlosion pressure rising rate was increased.
Risk Evaluation of Oxidizing Substances by Burning Test Method
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 73~82
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 sub-stance 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
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 sub-stances as dangerous goods.
A STUDY ON LAND USE APPRAISAL MODEL ( I )
Kim, Yun-Seon ;
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 83~88
In This study, an attempt has been made to build a land use appraisal model as a basis for assessing the abatement effectiveness of airpollution within Seoul city due to nitrogen oxides emitted from motor trucks. Furthermore, the model is used to predict the city's traffic volum and its validity in ascertained by comparing it with the actual recorded traffic volume data. Through a series of land use planning alternatives established in this study, the abatement effective-ness of Seoul city is assessed.
A Study to Identify the Causes of Electrical Fires
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 89~98
In this study, the methods to identify the causes of electrical fires are suggested. Among several causes of electrocal fires, it is focused upon a short-circuit and an over-current accidents, which take the highest ratio compare with any other causes. To propose the exact method of identification, electric wires(HIV, IV), fuses and plug-receptacls are tested under the conditions of electrical accidents and external fires, respectively. By analyzing the microphotographs, the differences between the results from electrical fires and the others are found out.
Evaluation of Strength of Weld Bonding Specimen Considering Effects of Environments (In Case of Tensile Shear)
Lim, Ki-Chang ; Kuen Ha, Shin ; S.H. Lim ;
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 99~107
Weld bonding can be applied as a combined method of spot welding and adhesive to have more advantages than those. Weld bonding has many merits that enlarge the fatigue strength of spot Welding and also improve the creep of adhesive. But it has not beer proved well in the various environmental conditions. In this study, weld bonding test for fatigue properties and tensile strength is presented under such various coditions as temperatures, humidity, and etc.
가스누설 화재경보설비 개요
Journal of the Korean Society of Safety , volume 7, issue 3, 1992, Pages 108~116