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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
Editor in Chief :
Volume & Issues
Volume 28, Issue 6 - Oct 2013
Volume 28, Issue 5 - Sep 2013
Volume 28, Issue 4 - Aug 2013
Volume 28, Issue 3 - Jun 2013
Volume 28, Issue 2 - Apr 2013
Volume 28, Issue 1 - Feb 2013
Selecting the target year
The Development of Robot System for Assessing Slip Resistance
Kim, Jung Soo ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 1~4
DOI : 10.14346/JKOSOS.2013.28.5.1
The main objective was to design and develop a prototype robot system for assessing slip resistance. The developed robot system will be able to be used for stochastic nature of friction in the whole workplace. The second objective was to evaluate its operating condition in the laboratory, using a dreg sled type slipmeter(BOT-3000) as reference device. It was found that COF(Coefficient of Friction) measured with robot system was similar to that of BOT-3000 when sliding velocity was reached at 0.2m/s. The robot system might be the more promising one than any traditional measurement devices. A further evolution of prototype devices, as well as the development of test methods for that's various applications, is to be started in forthcoming studies.
A Basic Study on the Stress Field in the Electrode Interface of the Planar SOFC Single Cell
Park, Chul Jun ; Kwon, Oh Heon ; Kang, Ji Woong ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 5~9
DOI : 10.14346/JKOSOS.2013.28.5.5
Recently, eco-friendly sources of energy by fuel cells that use hydrogen as an energy source has emerged as the next generation of energy to solve the problem of environmental issues and exhaustion of energy. A solid oxide fuel cell(SOFC) classified based on the type of ion transfer mediator electrolyte has actively being researched. However, the reliability according to the thermal cycle is low during the operation of the fuel cell, and deformation problem comes from the difference in thermal expansion coefficient between the electrode material, the components made of ceramic material is also brittle, which means disadvantages in terms of the strength. Therefore, in this study, considering the states of the manufacturing and operating of SOFC single cells, the stress analyses in the each of the interfacial layer between the anode, electrolyte and the cathode were performed to get the basic data for reliability assessment of SOFC. The obtained results show that von Mises stress according to the thickness direction on operating state occurred maximum stress value in the electrolyte layer. And also the stresses inside the active area on a distance of 1
from the electrode interface were estimated. Futhermore the evaluation was done for the variation of the stress according to the stage of the operation divided into three stages of manufacturing, stack, and operating.
A Field State Investigation on Standalone PV streetlight for Development of Real-time Analysis Technology
Kim, Doo Hyun ; Kim, Sung Chul ; Hwang, Dong Kyu ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 10~14
DOI : 10.14346/JKOSOS.2013.28.5.10
This paper is aimed to investigate the actual conditions of standalone PV(Photovoltaics) streetlight in public place and analyze cause of failure and derive the method of decrease for standalone PV streetlight. The cost of installing standalone PV streetlight in a public for the safety and convenience of life is expensive(300 million won per unit). Management of standalone PV streetlight is important because it is operating system itself, after installation, but concern degree of management is very low and development of technology has not been done. Accordingly, standalone PV streetlight in public place is not operate in night, this phenomenon is lasted for several days to months. Therefore this study, for standalone PV streetlight constantly to keep the normal operation, investigation conducted to check status of standalone PV streetlight(50 units), the voltage of the main parts and analyze the cause of the failure. In addition, the improvement of standalone PV streetlight is suggested by using FTA(fault tree analysis).
An Experimental Study on Melting Characteristics of Low-voltage Miniature Cartridge Fuse
Ji, H.K. ; Kim, J.P. ; Song, J.Y. ; Choi, Y.W. ; Park, C.S. ; Park, N.K. ; Kil, G.S. ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 15~20
DOI : 10.14346/JKOSOS.2013.28.5.15
This paper dealt with melting characteristics of low-voltage miniature cartridge fuse used for 220 V electronic equipment. The experimental sample is low-voltage miniature cartridge fuse with rating of 250 V(3A) and size of
mm. In order to evaluate melting and scattering characteristics of the fuse, we applied to 8/20
surge current, overload current and external thermal stress such as flame of fire. From the experimental results, the fuse element was melted and scattered by applied surge current(above 0.79 kA) and overload current(above 4.5 A). It was also attached to the inner surface of the fuse tube. The fuse element was attached as a thin film on inner surface of fuse tube when large surge current was applied. It was confirmed, however, the fuse element was not changed by external thermal stress such as flame and hot-air.
Visualization of Delamination Region in Concrete Structures using Mode Shapes of Delaminated Concrete Section (I) : Modal Test
Oh, Taekeun ; Shin, Sung Woo ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 21~26
DOI : 10.14346/JKOSOS.2013.28.5.21
Delamination of cover concrete due to re-bar corrosion is a critical damage reducing structural safety of reinforced concrete structures. Therefore, it should be detected and evaluated to provide appropriate maintenance to recover structural integrity. Impact-echo method, which utilizes thickness vibration characteristics of delaminated concrete section, is effective for detection and evaluation of small areal size delamination. However, it may not be applicable for large areal size delamination in which flexural vibration modes are dominated. In this study, applicability of vibration mode shapes of delaminated concrete section is investigated for visualization of delamination region in concrete structures. Numerical and experimental modal tests are performed to estimate mode shapes of delaminated concrete section and linear absolute summation technique is proposed for effective visualization of delamination region based on estimated mode shapes.
A Study on the Intensive Safety Management Items of Small-Sized Construction Sites
Go, Seong-Seok ; Song, Do-Heom ; Jang, Yun-Ra ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 27~34
DOI : 10.14346/JKOSOS.2013.28.5.27
Almost accidents in construction sites are occurred by unsafe work conditions and failure making safe environment. As recent construction projects become more complex, various and diversified, So the potential of construction-related accidents is increased as well. Comparing the frequency of construction-related accidents in large-sized construction sites, small-sized construction sites are more vulnerable because of lack of workforce and less effective technology system. Furthermore, the absence of safety committee, poor financial condition leads to lack of safety education, installation of safety facilities, and provision of individual protective equipment, which indicates difficulties handling even basic safety management. Therefore, in order to lower the hazard rate at small-Sized construction sites, it is necessary to proceed with more structural and thorough actions for preventing accidents. In other words, it is necessary to analyze the causes of the accidents at small-sized construction sites, set criteria for safety management, and suggest safety management items according to work classification by evaluating the relative importance of the items.
Numerical Analysis of Utility Tunnel Movement under Reclamation Ground
Yoon, Woo Hyun ; Hwang, Chulsung ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 35~40
DOI : 10.14346/JKOSOS.2013.28.5.35
Recently reclamation land is largely developed to utilize the land according to economic growth. The soil of landfill is soft, low shear strength, which makes it difficult to use the equipment. A large movement is occurred on the utility tunnel under construction. The inclined land with high water level and underground facilities are widely distributed and the excess pore water pressure may occur under construction similarly to this study. Some different conditions are made to design result, such as 4m of soil piling near the construction area, heavy rainfall during 2nd excavation that may cause flow liquefaction. To analyze the cause of transverse lateral movement, Three dimensional analysis are performed to four load cases, which is original design condition, flow liquefaction by heavy rainfall, unsymmetric lateral soil pressure, and both of them simultaneously. Ten steps of full construction stage, 1st excavation for utility tunnel, construction of utility tunnel, 1st refill, piling soil from 1m to 4 m, 2nd excavation for drainage culvert, liquefaction around the utility tunnel, construction of drainage culvert and 2nd refill, are take into account to investigate the cause of movement.
Evaluation for Relative Safety of RC Slab Bridge of Applying Limit State Design Code on Korean Highway Bridge
Park, Jin-Woo ; Hwang, Hoon-Hee ; Kang, Sin-Oh ; Cho, Kyung-Sik ; Park, Woo-Jin ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 41~48
DOI : 10.14346/JKOSOS.2013.28.5.41
This paper is intended to provide the background information and justification for Korean highway bridge design code(limit state design)(2012). Limit state design method calculates reliability index and probability of failure through the analysis of the reliability of the experimental database. It has become possible to perform the economical and consistent design by evaluating the safety of a structure quantitatively. In this paper, we used the design specifications of RC slab bridge of superstructure form of Road Design Manual in Part 5 bridge built in highway bridge. This study conducted structural analysis using the method of frame structure theory, design and analysis of bridge by limit state design method, the design code including various standards and Load model applied Korean highway bridge design code limit state design(KHBDC;2012). As a result, it analyzed the effect of safety through comparison. Showing effect of improvement the safety factor and comparing the value of the result, it is determined to be capable of economical design and safety. Furthermore, limit state design method was able to determine many redundant force of cross-section compared with existing design method. It is determined that it can reduce the overall amount because of the reduction of the cross-section and girder depth.
Seismic Performance Improvement of Concrete Gravity Dam by Post-tensioned Anchors
Kim, Yongon ; Kim, Se-Il ; Ok, Seung-Yong ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 49~53
DOI : 10.14346/JKOSOS.2013.28.5.49
This paper describes the assessment of seismic performance of the concrete gravity dam seismically reinforced by post-tensioned anchors. In order to evaluate the seismic performance, the response spectrum analyses have been carried out for 7 different configurations of the post-tensioned anchors, and then their performance improvement in the maximum tensile and compressive stresses is compared to each other. The comparative results demonstrate that the layout of the post-tensioned anchors strongly influences the seismic performance of the concrete gravity dam. In this study, the slightly-inclined vertical anchorage system shows the largest improvement on the overall performance of the seismically-excited concrete gravity dam.
Analysis of Velocity Structures and Shear Stresses by Parameters and Internal Boundary Conditions of Depth-averaged Flow Model
Song, Chang Geun ; Woo, In Sung ; Oh, Tae Keun ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 54~60
DOI : 10.14346/JKOSOS.2013.28.5.54
In this study, a finite element model based on the SU/PG scheme was developed to solve shallow-water equations and the influences of parameters and internal boundary conditions on depth-averaged flow behavior were investigated. To analyze the effect of roughness coefficient and eddy viscosity on flow characteristics, the developed model was applied to rectangular meandering channel with two bends, and transverse velocities and water depth distributions were examined. As the roughness coefficient adjacent to wall increased, the velocities near the wall decreased, and the reduced velocities were compensated by the expanding mid-channel velocities. In addition, the flow characteristics around a circular cylinder were analyzed by varying the internal boundary conditions as free slip and no slip. The assignment of slip condition changed the velocity distribution on the cylinder surface and reduced the magnitude of the shear stress up to one third.
Analysis and Countermeasure of Occupational Stress for Steel Manufacturing Worker
Lee, Sun Yong ; Woo, Heung-Sik ; Weon, Jong-Il ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 61~65
DOI : 10.14346/JKOSOS.2013.28.5.61
Occupational stresses of steel manufacturing workers have been investigated using an organized questionnaire composed of 40 items. Three hypothesizes were developed based on the literature review of related researches. Empirical data surveyed from ones working in steel manufacturing jobs were collected and the in-depth statistical analyses using Statistical Package for the Social Sciences(SPSS) software were performed. These statistical results indicate that the existence of occupational stress may cause to take place industrial accidents. Consequentially, the prevention of occupational stress helps to promote the will to work, following by increasing job satisfaction in working circumstance of steel manufacturing.
Relative Effects of Education and In-vehicle Information System on Eco-driving and Driving Workload
Lee, Kyehoon ; Oah, Shezeen ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 66~70
DOI : 10.14346/JKOSOS.2013.28.5.66
This study examined the relative effects of education and eco-IVIS(in-vehicle information system) to reduce fuel consumption and greenhouse gas emissions. Also the study investigated the increasing of driving workload when drivers interact with intervention technique. Thirty participants randomly assigned into two groups(training and eco-IVIS) and conducted driving before and after the each intervention technique. While driving, we observed three driving behaviors: Frequency of excessive RPM, percent of speeding, and mean fuel efficiency. Also the Driver Activity Load Index was used to rate participants' subjective ratings of driving workload. Although the results showed positive impact of both education and eco-IVIS to increasing the eco-driving behaviors, eco-IVIS was more effective than education. However, we found comparable level of driving workload in the education and eco-IVIS.
An Investigation on Actual Condition and the Influence of Safety on Elementary School Road by Types of Urban Spatial Structure
Kim, Tae-Ho ; Kim, Seung-Hyun ; Lee, Soo-Il ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 71~77
DOI : 10.14346/JKOSOS.2013.28.5.71
This Study aims at investigating actual condition on attending school road of children and analyzing empirically the characteristics of cognition and the influence of safety on school road. This study findings are as follows : 1) Walking alone to go to school is the highest rates among Commuting Mode, and Commuting distance to school is nearly doubles than range of school zone(300 m). 2) Among characteristics of urban spatial structure affecting on influence classify safety of school road, 'Commuting Distance' has been drawn to most influential variable. Especially, there are 4 types classified by commuting distance and it became obvious that the longer the distance, the lower the safety score(under 127 m=76.9 points, Over 451 m=58.3 points). 3) As a result of investigating the influence of Safety on attending school road, Vehicle commuting speed urder 127 m as internal of school zone, and Walking and crossing convenience over 451 m as external of school zone have a lot of influence on safety cognition on school road. Therefore Safety on school road should be considering the commuting distance to school among surrounding characteristics, needed for improvement plan and program based on real safety cognition of children.
A Study on Characteristics of Labor Force Participation Rate and Work Environment of Female Workers
Yi, Kwan Hyung ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 78~82
DOI : 10.14346/JKOSOS.2013.28.5.78
The purpose of this study is to review the labor force partitpation rate and work environment characteristics of female workers to provide basic information for establishment and implementation of effective policies related to accident prevention and workers health protection for female workers. It was analyzed employment status, work environment and injuries and illnesses based on economic activity census results, compensation of industrial injury and the second working condition survey. According to economic activity census results, female labor force participation rate has been steadily increased, whereas male labor force participation rate has been decreased since 1970. Industrial accident rate has been declined in male workers but that in female workers has been steadily increased even though male workers were higher accident rate than female workers. It was evaluated that female workers are vulnerable to industrial injuries and illnesses in the aspect of their working environment and employment status. Also, Substantial differences between female and male workers in occupational exposure patterns, occupational disease and occupational environments were observed. Therefore it was recommended that special care programs for female workers such as a specialized monitoring and management program should be introduced in the near future.
A Study on Protective Purposes and Intents of Use of Safety Helmets as for Reduction of Falls
Kim, Jin Hyun ;
Journal of the Korean Society of Safety , volume 28, issue 5, 2013, Pages 83~89
DOI : 10.14346/JKOSOS.2013.28.5.83
Occupational Safety and Health Act provides that industrial safety helmets are personal protective equipment(PPE) to protect heads against falls from a height. Relevant domestic regulations are distinguished and different from other countries' cases. This study investigated industrial safety helmet's protective purposes and characteristics related to falls and the notion of fall prevention. A comparative analysis of regulations on safety helmets and fall prevention as well as standards on safety helmet's impact test requirements is followed by a literature review. It is also suggested that the term "fall" related to safety helmets should be changed to "impact on the upper part of head" in domestic regulations and standards.