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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Safety
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Journal DOI :
The Korean Society Safety
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Volume & Issues
Volume 8, Issue 2 - Dec 2009
Volume 8, Issue 1 - Jun 2009
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Numerical Analysis for Development of Vertical Falling Prevention System
Kwon, Oh-Heon ; Kim, Sang-Tae ; Kang, Ji-Woong ;
International Journal of Safety, volume 8, issue 2, 2009, Pages 1~4
Various falling prevention systems with vertical guided rail have been supplied in order to prevent falling accidents and acquire the long life and cost down for the maintenance. Almost the imported system is composed of a guided rail and the comfort components. It has the mechanism that cannot be dismounted from the guided rail at the accident site. Thus, the aim of this study is to develop a falling prevent system that has a direct dismounting function, which can release easily from the falling accident point. This system has a high durability and robust. And the cost efficiency of the system and safety for workers also are improved remarkably. From the results, we showed the proposed new falling system is sufficiently safety and satisfies the KOSHA regulation through the numerical stress analysis. Also it is expected as the useful and effective safety device for workers.
A Study on the Fusing Temperature Distribution for Laser Printer Toner by Using Numerical Computation
Choi, Yoon-Hwan ; Lee, Yeon-Won ; Kim, Dong-Kyun ; Doh, Deog-Hee ;
International Journal of Safety, volume 8, issue 2, 2009, Pages 5~8
Fusing process of laser printer is the step to fuse toner on the paper and it has a great effect on fast printing speed, decrease in waiting time and improvement of printing quality. In order to improve the quality of fusing, a study on the fusion region is required. Recently, various researches are progressing in this field. In this study, the research about the temperature distribution of fusing region is performed through numerical analysis because fusing region is one of the important factors influencing fusing quality. According to results, it is ascertained that the temperature of fusing region is relative to velocity of the paper under print and has a regular distribution to width direction of the paper.
Analysis of Risk Voltage for Grounding Electrode by Injection of Earth Leakage Current
Gil, Hyoung-Jun ; Kim, Dong-Woo ; Kim, Dong-Ook ; Lee, Ki-Yeon ; Moon, Hyun-Wook ; Kim, Hyang-Kon ; Kil, Gyung-Suk ;
International Journal of Safety, volume 8, issue 2, 2009, Pages 9~14
This paper describes analysis of risk voltage for grounding electrode where earth leakage current is injected. To assess risk voltage of grounding electrode, the grounding simulator and CDEGS program were used to obtain measured data and theoretical results of this study. The grounding simulator was composed of a hemispherical water tank, AC power supply, a movable potentiometer, and test grounding electrodes. The shapes of grounding electrode model was ground rod. The potential rise was measured by grounding simulator, and the touch and step voltages were computed by CDEGS program. As a consequence, the potential rise of ground rod abruptly decreases with increasing the distance from the grounding electrode to the point to be tested. The touch voltage above the ground rod was low, but the step voltage was high. The measured results were compared with the computer calculated data and were known in good agreement.
The Prediction of Lower Flash Points by Optimization Method
Ha, Dong-Myeong ; Lee, Sung-Jin ;
International Journal of Safety, volume 8, issue 2, 2009, Pages 15~19
The flash point is the most widely used flammability property for the evaluation of the flammability hazard of combustible liquid mixtures. In this paper, the reported flash points for the the binary systems, ethylbenzene+n-butanol and ethylbenzene+n-hexanol were correlated by the optimization method. The optimization method based on the van Laar and Wilson equations were compared with the Raoult's law. The calculated values based on the optimization method were found to be better than those based on the Raoult's law.
An Experimental Study on the Mechanical Properties and Rebound Ratios of SFRS with Silica Fume
Son, Young-Hyun ; Chai, Won-Kyu ;
International Journal of Safety, volume 8, issue 2, 2009, Pages 20~25
In this study, an experiment in the field was performed to analyze the mechanical properties and the influence of steel fiber and silica fume on the rebound ratios of shotcrete. The experimental parameters which are the reinforcing methods (steel fiber, wire mesh), steel fiber contents (0.0%, 0.5%, 0.75%, 1.0%), silica fume contents (0.0%, 10.0%), layer thickness (60 mm, 80 mm, 100 mm), and the placing parts (sidewall, shoulder, crown) were chosen. From the mechanical test, it was found that the flexural strength and toughness is significantly improved by the steel fiber and/or silica fume. According to the results for the side wall in this test, the larger the fiber contents are in case of steel fiber reinforced shotcrete, the less the rebound ratios are within the range of 20-35%, compared to the wire mesh reinforced shotcrte. And also, the reduced rebound ratios were very larger in using steel fiber reinforced shotcrete with silica fume content of 10%, and these results are true of the shoulder and the crown. respectively.
Poisson Effect on Electromechanical Impedance of Unconstrained Piezoelectric Patch
Shin, Sung-Woo ; Kwon, Oh-Heon ;
International Journal of Safety, volume 8, issue 2, 2009, Pages 26~30
In this study, the Poisson effect on resonant frequency behaviors of the unconstrained piezoelectric patch is investigated. The electromechanical impedance models for the un-bonded patch are derived from the two existing bonded patch models and numerical analysis for a given piezoelectric material is performed. From the analysis, it is found that the Poisson effect is not important as long as the electromechanical impedance model is used to predict the locations of resonant frequencies. However, Poisson effect should be considered when predicting the location of the largest resonant frequency of the patch since the amplitude responses are different with the model used.
A Study of Software Coding Rules Inspection Tool for Railway Signaling Software Safety
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ;
International Journal of Safety, volume 8, issue 2, 2009, Pages 31~36
In accordance with the development of recent computer technology, railway signaling software became more complex for the intellectualization. Therefore the importance and dependency of railway signaling system on the computer software is getting more increased further, and the testing for the safety and reliability of railway signaling system software became more important. It is started to become influential as very important issue for the reliability and safety of vital embedded software like railway signaling system. The software coding which can have an effect on the safety at the coding level of software shall not be included preferentially, for the safety of software, and must be checked. This thesis suggested an automated testing tool for coding rules on this railway signaling system software, and presented its applied result for railway signaling system software. The testing items in the implemented tool had referred to the international standards in relation to the software for railway system and MISRA-C standards. This automated testing tool for railway signaling system can be utilized at the assessment stage for railway signaling system software also, and it is anticipated that it can be utilized usefully at the software development stage also.