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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 22, Issue 6 - Dec 2007
Volume 22, Issue 5 - Oct 2007
Volume 22, Issue 4 - Aug 2007
Volume 22, Issue 3 - Jun 2007
Volume 22, Issue 2 - Apr 2007
Volume 22, Issue 1 - Feb 2007
Selecting the target year
The Characteristics of Fluid Flow in a Channel by Oscillating Vortex Generator
Bang, Chang-Hoon ; Kim, Jung-Soo ; Choo, Hong-Lok ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 1~7
A problem of a unsteady time-dependent flow in a channel is of practical importance and widely considered in the design of devices such as heat exchangers, duct, and electronic equipments. The characteristics of fluid flow in channel with oscillating vortex generator was investigated experimentally. The main object of this study was to investigate the effect of the excited frequency, the excited amplitude, and Reynolds numbers on the generated frequency. Flow patterns were visualized using smoke generator and generated frequencies were measured using hot wire anemometer. When the excited frequency is increased, excited amplitude decreased and Reynolds number increased, the strength of PSD of generated frequency is decreased.
FEM Analysis on Rolling Contact Fatigue Crack of a Railway Wheel
Kim, Ho-Kyung ; Yang, Kyoung-Tak ; Kim, Hyun-Jun ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 8~14
In this study, tensile and fatigue crack propagation tests machined from actual wheels were performed. FEM analysis also was performed on the crack that was assumed to be 15 mm in depth under the wheel tread surface. The stress intensity factors K I and K II at the crack tip under the stress(
) due to a rolling contact were analyzed for crack growth characteristics. As a result, the perpendicular crack was found to be more dangerous compared to the parallel one. It is found that in the wheel fatigue crack, parallel to the wheel tread surface, the crack with its length 2a = 2.4mm starts to propagate due to the fact that the effective stress intensity factor access to the threshold stress intensity factor(
) of the wheel.
Fatigue Crack Propagation Behavior of Fine Grained Al-5083 Alloy Produced by Severe Plastic Deformation
Kim, Ho-Kyung ; Yang, Kyoung-Tak ; Kim, Hyun-Jun ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 15~21
Fine grained Al-5083 alloy produced by equal channel angular pressing (ECAP) at
was tested for investigating mechanical properties and crack growth propagation behavior. Also, FEM stress and strain analysis for the samples during ECAP were investigated, using a plastic deformation analysis software DEFORM 2-D. Coarse grained as-received samples exhibited UTS of 255.6MPa with a elongation to failure of 34.4%. By contrast, the ECAPed fine grained samples exhibited UTS of 362.0MPa with a elongation to failure of 12.9%. Fatigue crack growth resistance and threshold of fine grained samples were lower than that of as-received coarse grained samples. The higher fatigue crack growth rate in the fine grained ECAPed samples may partially arise from small roughness closure effect due to smoother fracture surfaces.
3-Dimensional Stress Analysis for Creep Life Assessment of Y-Piece Under Inner Pressure
Shin, Kyu-In ; Lee, Jin-Sang ; Yoon, Kee-Bong ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 22~27
To assess a creep life of elevated temperature plant components, inspections and analysis are usually focused on the critical locations. In this study, stress analysis of a weld region in branch part of Y-piece was conducted by using a three-dimensional finite element analysis. The stresses at the inner and outer surface in the weld part were estimated by using elastic and elastic-creep analysis. For the elastic-creep analysis two kinds of elastic-creep analysis was conducted. The one was assumed that base and weld material properties were same and the other was that material properties were different between base and weld metal. The material properties of base and weld metal were used from reference data. The results showed the stress relaxation level and its location. The result stresses are also compared with elastic stresses.
A Terminological and Etymological Study about 'Safety'
Lee, Jang-Gook ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 28~35
The terminological definition of 'safety' is difficult because the word has an meaning and the usage is too wide and various in itself. There could be various meanings of 'safety' according to the specific area on which the term is used. Even though the variety is permitted, a definition on the term of 'safety' is necessary not only to raise the understanding of consistent terminological meaning but also to make assure the perfectness on all of the applications. The term of 'safety' can be understood clearly by the comparison with the antonym and the synonym, and the limitation of the usage can be established through the comparative studies. Comparing with the antonym such as 'risk', 'safety' implies the recognition and prevention of the danger before an accident or a disaster occurs. Comparing with another antonym of 'disaster', 'safety' comprehends all the saving activities for the disaster and the measures to prevent the spread of collateral damages. The comparison with the synonym, 'security' shows that 'safety' can include the prevention of intentional mishaps. The Korean word of 'safety' might be selected by a scholar who was well educated to understand Chinese language and certain canonical texts written in Chinese. The etymological study of 'safety' was concentrated on I-ching which has been believed that could foretell a future and show a measure to prevent bad luck by performing good virtue in the life. The Korean word of 'safety' might come from Xicizhuan(Great treatise) which is known as one of ten commentaries for I-ching. The texts from Xicizhuan describes that all of the explanations about safety which could be translated to the principles of safety nowadays.
An Experimental Study on the Fire Hazards in Electric Heater
Hong, Sung-Ho ; Lee, Bock-Young ; Park, Sang-Tae ; Yu, Hyun-Jong ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 36~40
This study presents on the analysis fire hazards of electric heater. In order to analyze fire hazards fire experiment is conducted. The fire experiment is conducted to simulate normal condition and abnormal condition. The abnormal condition experiment is simulated in which combustibles are placed near by electric heater. Vertical burning test(UL 94) is conducted for the fire retardant experiment. The results show that fire hazard is high in case of abnormal condition. And Material of electric heater has not fire retardant performance. In this paper, we suggest to add temperature fuse in electric heater for reducing fire hazard.
Electric Shock Risk Assessment of the Human Body and Potential Distribution Analysis by FLUX3D in a Public Bathtub
Kim, Doo-Hyun ; Kim, Sung-Chul ; Lee, Jong-Ho ; Kim, Han-Sang ; Kim, Chong-Min ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 41~46
This paper considers the electrical shock risk of the human body due to underwater leakage current in such places of public baths. Many submerged electric facilities in a public bath may create a severe electric shock hazard for the human body, since wet body in an accidentally energized bathtub can result in low electrical resistance through the human body for leakage or fault currents. Therefore a major consideration, in the context of electrical safety underwater, is the shock risk to the bather as a result of electric current flowing through the water in bathtub. To assess the electric shock risk and to analyze the potential distribution in a bathtub, 2 different situation cases are set up, then experimental and simulation methods are adopted. The validity of 2 cases of simulation and experiment data in a bathtub for electric distribution underwater are compared and analyzed. Also electric shock risk assessment underwater in a real public bathtub by simulation program package, Flux 3D, was conducted herein, and the results are presented and discussed.
Measurement and Prediction of the Flash Points and the Fire Points for the Flammable Binary Mixtures Using Open-cup Apparatus
Ha, Doo-Myeong ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 47~52
The flash points and the fire points for the m-xylene+n-propionic acid and n-butanol+n-pentanol systems were measured by using Tag open-cup apparatus(AS1M D 1310-86). The experimental flash points of two binary systems were compared with the values calculated by the Raoult's law, Van Laar equation and Wilson equation. The calculated values based on the Raoult's law on m-xylene+n-propionic acid system were found to be better than those based on Van Laar and Wilson equations. The calculated values based on Van Laar equation on n-butanol+n-pentanol system were found to be better than those based on the Raoult's law and Wilson equation. The the fire points for the m-xylene+n-propionic acid system were about
above the flash points. In the case of n-butanol+n-pentanol system, the flash points and the fire points had been found to be identical.
A Method for the Quality Improvement by the Punch List Analysis of Apartment Construction
Lee, Jae-Yong ; Ji, Dae-Jun ; Lee, Soo-Yong ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 53~58
This study is to find out primary factors through the punch list in the large scale apartment housing complex, to prevent repeatedly occurring defects of construction and to gain quality management. The following are the findings of the research. (1) The positive strengthening of supervision for the workers can contribute to prevent defects of apartment construction and make better quality of the construction. (2) A solution should be made for the poor of surface join and the damage of work element showing a lot in the apart construction, which prevent defects and improve construction quality. (3) Indirect factors such as negligence and carelessness of the management should be improved to advance construction quality, and the caution and control strengthening of the management should be followed. It is revealed that hitch, omission, and heedlessness come from the defects, and the shortage of skill and checking appear as indirect factors. Therefore, to get quality improvement, the enhancement of the management factors, employment of excellent workers, and enhancement of working attitude and construction management are needed.
Analysis of Crane Accidents by Using a Man-Machine System Model
Park, Jae-Hee ; Park, Tae-Joo ; Lim, Hyun-Kyo ; Seo, Eun-Hong ;
Journal of the Korean Society of Safety , volume 22, issue 2, 2007, Pages 59~66
As the need of handling heavy materials increases, various cranes are used in industries. However, the effectiveness of crane also entails industrial accidents such as falling, constriction etc. In fact, the number of fatal accidents caused by crane is still high in Korea. To find out the causes of the accidents in terms of human error, we developed a man-machine system model that consists of two axes; human information processing and crane life cycle. In the human information processing dimension, we simplified it as five functions; sensing and perception, decision making and memory, response etc. In the crane life cycle dimension, we divided it into nine phases; design, production, operation etc. For the 152 fatal accident records during 1999-2006 years, we classified them into 45 cells made by two axes. Then we identified the preceding causes of the classified crane accident based on performance shaping factors. As the results of statistical analysis, the overall trend of crane fatal accidents was described. For the cause analysis, wrong decision making in work plan phase shows the highest frequency. Next, the poor information input in crane operation followed in accident frequency. In ergonomics view, the problems of interface design in displays and controls made 11.8% of fatal accidents. Following the analysis, several ergonomic design guidelines to prevent crane accidents were suggested.