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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 29, Issue 6 - Dec 2014
Volume 29, Issue 5 - Oct 2014
Volume 29, Issue 4 - Aug 2014
Volume 29, Issue 3 - Jun 2014
Volume 29, Issue 2 - Apr 2014
Volume 29, Issue 1 - Feb 2014
Selecting the target year
Fatigue Strength Evaluation of Mechanical Press Joints of Cold Rolled Steel Sheet under Cross-Tension Loading
Kim, Jong-Bong ; Kim, Taek-Young ; Kang, Se-Hyung ; Kim, Ho-Kyung ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 1~7
DOI : 10.14346/JKOSOS.2014.29.3.001
In this study, for the evaluation of the static and fatigue joining strength of the joint, the geometry of the cross-tension specimen was adopted. The specimens were produced with optimal joining force and fatigue life of the clinch joint specimens was evaluated. The material selected for use in this study was cold rolled mild steel (SPCC) with a thickness of 0.8 mm. The maximum tensile load was 708 N for the specimen with single point. The fatigue endurance limit (=42.6 N) per point approached to 6% of the maximum tensile strength at a load ratio of 0.1, suggesting that the joints are vulnerable to cross-tension loading during fatigue. Compared to equivalent stress and maximum principal stress, the SWT fatigue parameter and equivalent strain can properly predict the current experimental fatigue life. The SWT parameter can be expressed as
Temperature Characteristics on Cooking Equipment Materials of Portable Gas Ranges
Kim, Dae-Hyun ; Lee, Keun-Oh ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 8~13
DOI : 10.14346/JKOSOS.2014.29.3.008
Accidents involving portable ranges occurred total 133 cases for the last five years(2008~2012). It accounted for 18.0% of all gas accidents(739 cases). Major causes of accidents are using of excessive hot grill, leaving a butane can near fire and overheating of a butane can during cooking. In this study, it is a desire to investigate the relationship between thermal behavior mechanism depending on characteristics of cooking equipment materials of portable gas ranges. It shows that slope of temperature change curve correlates with difference of heat capacity on thermal behavior characteristics experiment depending on materials of cooking equipment. In conclusion, temperature characteristics appear differently depending on variables such as materials of cooking equipment. Especially, it is necessary to restrict using cooking equipment made of stones, because it is very dangerous that temperature of can is rapidly increasing caused by high heat capacity of stone.
Influence of Stacking Condition on Collision Safety of CFRP Side Member
Hwang, Woo Chae ; Yang, In Young ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 14~19
DOI : 10.14346/JKOSOS.2014.29.3.014
The global demand for reduction in the weight of automobiles has led many countries to focus on the development of hybrid, eco-friendly, and electric cars. Reduction in the weight of materials can both increase fuel efficiency and maximize automobile performance. Therefore, the design of automobile should be inclined towards the safety aspects. but at the same time, it also consider reducing the structural weight of an automobile. In this study, CFRP side members with circular and double hat shaped section was manufactured. The impact collapse tests performed with change of the stacking condition, such as variation of interface number and outerlayer angle. The impact collapse load and absorbed energy were quantitatively analyzed according to the changes in section shapes and stacking condition. This analysis was performed to obtain design data that can be applied in the development of optimum lightweight members for automobiles.
Detection of Current Signal and Thermal Characteristics of Electric Fan Operated in Various Situations
Kim, Doo-Hyun ; Lee, Heung-Su ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 20~27
DOI : 10.14346/JKOSOS.2014.29.3.020
Cooling equipment is the frequent occurrence of fire despite the absence of the heating element. National fire statistics in 2013 show that a total of 263 fires occurred in the cooling equipment and the number of electric fan has 145 fire cases. This is accounted for 55.1% of the whole. Electric fan is the electrical appliance that the heat is generated on the winding wire and the iron core. If such characteristic is not controled properly, fire would break out at the electric fan. also there is a gap filled with an insulator between connection terminals of the capacitor in the electric fan. But in case that the gap on the capacitor is covered with some conductive material such as dust, there would be a fire as well caused by electrical heating locally. Although many studies related with those have been conducted, electric fan fire is continuously occurred. In this study, thermal characteristics and current signal in various conditions such as the heat generation of windings including iron cores of the motor and the dielectric breakdown of terminals on the capacitor connected to the motor were detected. In order to measure the maximum temperature, "third level" wind velocity button was pushed and the time selection switch to "continuation" was set. Analyzed data would be available for the fire safety of the electric fan.
A Study on the Decreasing Method of Electric Shock Accident in the Construction Industry
Choi, Sang-Won ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 28~33
DOI : 10.14346/JKOSOS.2014.29.3.028
Regarding the characteristics of fatal electric shock accident during the past 10 years, fatalities occurred more frequently in July & August, and AM 10-12 PM & 14-16. Also, the electric shock accident is occurred more frequently in the age group from 30 to 40. Especially, the fatal electric shock accident in construction industry covered more than half of total industry. Therefore, it is strongly requested for the protection technology of an electric shock from the low voltage electric path, grounding method and workers. The aim of this study is to propose the policy about the equipment performance standards and/or worker's safety standards to revise the standards for preventing electric shock accidents on safety workings.
A Study on Improvement of the Performance of Pulsed AC Ion Bar (1)
Lee, Dong Hoon ; Choi, Dong Soo ; Jung, Yong Chul ; Kim, Sang Min ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 34~38
DOI : 10.14346/JKOSOS.2014.29.3.034
In Display such as LCD, LED, and AMOLED or semiconductor related industries are required to have static ionizer in order to produce reliable goods since the ionizer can create balanced ion that is delivered to producing goods to minimize electrical damages when manufacturing. However, the most general type of ionization is called, "Corona Discharge" that has a slight chances to generate unequal and unstable amount of each +/- ion to the target object. Then, the ionization performance will drastically decrease and end up with quality deterioration problem. In this research, our objective to resolve the current issue via applying "Coupling Condenser" on each counter electrodes of Corona discharging type ionizer. The result is that the ion balance was maintained the satisfied range that is within +/-100V when we changed the duty ratio of the High Voltage of Pulse AC about 40 ~ 70%. In addition, when levelling the High Voltage of Pulse AC, the ion balance holds the range within +20 ~ 0V. Even though we have tested the same experiment for a year, we have seen the range changes roughly
The Measurement of Fire and Explosion Properties of n-Hexadecane
Ha, Dong-Myeong ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 39~45
DOI : 10.14346/JKOSOS.2014.29.3.039
For the safe handling of n-hexadecane, the lower flash points and the upper flash point, fire point, AITs(auto-ignition temperatures) by ignition delay time were experimented. Also lower and upper explosion limits by using measured the lower and upper flash points for n-hexadecane were calculated. The lower flash points of n-hexadecane by using the Setaflash and the Pensky-Martens closed testers were measured
, respectively. The lower flash points of the Tag and the Cleveland open cup testers were measured
, respectively. The fire points of the Tag and the Cleveland open cup testers were measured
. respectively. This study measured relationship between the AITs and the ignition delay times by using ASTM E659 apparatus for n-hexadecane. The experimental AIT of n-hexadecane was
. The calculated lower and upper explosion limit by using measured lower
and upper flash point
for n-hexadecane were 0.42 Vol.% and 4.70 Vol.%.
A Study on the Analysis and Improvement of the Basic Occupational Safety and Health Training for the Construction Industry
Woo, Changhoon ; Oh, Tae Keun ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 46~55
DOI : 10.14346/JKOSOS.2014.29.3.046
With regard to the basic safety and health education in construction industry issued on January, 26, 2012 by Occupation Safety And Health Acts, this study conducted a survey with self-administered questions for workers in the construction field in order to comprehend the problems since introduction of basic safety and health education. By analyzing the effectiveness of the safety and health activities, this study sought to reduce the trials and errors as well as to secure the improvement toward the early settlement of the basic safety and health education in construction industry. As a result of the question investigation, the survey respondents in the field sites who finished the basic safety and health education showed positive attitudes toward the improvement of safety awareness and the prevention of accidents. They also needed constant implementation of the education. At the same time, the government should improve the education program with strong policies to secure the effectiveness of the basic safety and health education in construction industry.
Efficient Vibration Control Approach of Two Identical Adjacent Structures
Ok, Seung-Yong ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 56~63
DOI : 10.14346/JKOSOS.2014.29.3.056
This study proposes a new control approach for efficient vibration suppression of two identical adjacent structures. The conventional control approach of two adjacent structures is to interconnect the two structures with passive, semi-active or active control devices. However, when the two adjacent structures are identical to each other, their dynamical behaviors such as frequency and damping properties are also the same. In this case, the interconnected control devices cannot exhibit the dissipative control forces on the both structures as expected since the relative displacements and velocities of the devices become close to zero. In other words, the interconnection method does not work for the twin structures as enough as expected. In order to solve this problem, we propose several new control approaches to effectively and efficiently reduce the identically-fluctuating responses of the adjacent structures with minimum control efforts. In order to demonstrate the proposed control systems, the proposed several control systems are optimally designed and their control performances are compared with that of the conventional optimal control system where each TMD(tuned mass damper) is installed in each structure for independent control purpose. The simulated results show that one of the proposed control systems(System 04) is able to guarantee enhanced control performance compared with the conventional system.
Inelastic Buckling Analysis of Semi-rigid Frames with Shear Deformations by Haringx's Theories
Min, Byoung-Cheol ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 64~71
DOI : 10.14346/JKOSOS.2014.29.3.064
The generalized tangential stiffness matrix of semi-rigid frame element with shear deformations based on Haringx's shear theory is newly derived and compared with the previous study based on Engesser's shear theory. Also, linearized elastic and geometric stiffness matrices are newly presented from the exact tangential stiffness matrix. In oder to obtain the inelastic system buckling load of shear flexible semi-rigid frame structure, the Ef method by tangential modulus theory is adopted and the FE analysis programs are developed. Finally, the shear and semi-rigid effects of system bucking are investigated by two numerical examples.
Minimum Thickness of Long Span RC Deck Slabs for Composite 2-girder Bridges Designed by KL-510 Load Model
Park, Woo-Jin ; Hwang, Hoon-Hee ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 72~78
DOI : 10.14346/JKOSOS.2014.29.3.072
The minimum thickness of long-span deck slab is proposed by checking the limit state according to the Korean highway bridge design code(limit state design). Both minimizing thickness and ensuring safety of deck slab are important design factors to increase a competitive price of the long span deck slabs. The required thicknesses for satisfying flexural capacity, preventing punching shear failure and limiting deflection were calculated by considering KL-510 load model which has increased total load compared to DB 24 from 432 kN to 510 kN. The results of the required thickness for various limit states were compared to propose the minimum thickness as a function of span length of deck slabs. The proposed minimum thickness is influenced by satisfying flexural capacity and limiting deflection. It turns out to be similar compared to the results of the previous study by ultimate strength design method even if the live load model was increased in total weights.
A Study on the Risk Assessment System for Human Factors
Jung, Sang Kyo ; Chang, Seong Rok ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 79~84
DOI : 10.14346/JKOSOS.2014.29.3.079
Human error is one of the major contributors to the accidents. A lot of risk assessment techniques have been developed for prevention of accidents. Nevertheless, most of them were interested in physical factors, because quantitative evaluation of human errors was difficult quantitatively. According to lack of risk assessment techniques about human errors, most of industrial risk assessment for human errors were based on data of accident analysis. In order to develop an effective countermeasure to reduce the risk caused by human errors, a systematic analysis is needed. Generally, risk assessment system is composed of 5 step(classification of work activity, identification of hazards, risk estimation, evaluation and improvement). This study aimed to develop a risk identification technique for human errors that could mainly be applied to industrial fields. In this study, Ergo-HAZOP and Comprehensive Human Error Analysis Technique were used for developing the risk identification technique. In the proposed risk identification technique, Ergo-HAZOP was used for broad-brush risk identification. More critical risks were analysed by Comprehensive Human Error Analysis Technique. In order to verify applicability, the proposed risk identification technique was applied to the work of pile head cutting. As a consequence, extensive hazards were identified and fundamental countermeasures were established. It is expected that much attention would be paid to prevent accidents by human error in industrial fields since safety personnel can easily fint out hazards of human factors if utilizing the proposed risk identification technique.
A Study of the Comparison Analysis for the Rocket Motor Impulse Noise by the Indoor Sizes
Song, Kee-Hyeok ; Chung, Sung-Hak ; Kang, WooRam ; Lee, DukJu ; Park, JongHo ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 85~90
DOI : 10.14346/JKOSOS.2014.29.3.085
The purpose of this study is to analysis the 3 differential size of the interior space for impulse noise. To achieve this goal the 3 kinds (27, 35,
) of interior space were performed comparing the impulse noise. Result of this study, the standard error of the mean peak sound pressure of value from 0.19 to 0.27dB and there was no significant difference (p<0.01). And B-duration is significant differences (P<0.01) range from 3.98 to 7.93ms. This is respectively less than 10ms. These findings are confirmed in accordance by the 3 differential space size of the indoor-impulse noise due to 0.3 dB or less, so there was no difference to the operational influence. And also below 100 Hz were found fundamental mode frequency analysis. Results were matched with calculated theoretical values.
Correlation Analysis of Stress to Industrial Safety Regulatory Compliance, Human Error and Job Satisfaction
Park, Yong-Houn ; Baek, Jong-Bae ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 91~97
DOI : 10.14346/JKOSOS.2014.29.3.091
This study aims to suggest a measure to reduce industrial accident and secure adaptation to the industrial safety regulation policies by empirically establishing the effects of stress from adaptation to the industrial safety regulation on the human error, one of direct causes of industrial accident to the target groups of the industrial safety regulation policies. This study as for content range examines the stress from adaptation to the industrial safety regulation, job satisfaction, human error, and as for spatial range, this study performed an empirical research on the workers of 24 companies located within Chungcheong region centers district among 153 companies nationwide that uses 7 chemicals by introducing PSM (process safety management) system of the Ministry of Employment & Labor as of January 2012. Based on these results and suggestions there are five(5) necessities to reduce industrial safety regulations adaptation stress and human error generation, first(1st) is the necessity of understanding influential factors to stress, second(2nd) is the necessity to customized vocational training, third(3rd) is improving enhance system of job satisfaction, forth(4th) is preparing stress-reduction program, and fifth(5th) is introducing on-site restrictive action of advanced country as politics items.
Severity Analysis for Vulnerable Pedestrian Accident Utilizing Vehicle Recorder Database of Taxi
Chung, JaeHoon ; Sul, Jaehoon ; Choi, SungTaek ; Rho, JeongHyun ; Lee, Jisun ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 98~106
DOI : 10.14346/JKOSOS.2014.29.3.098
This study proposes severity analysis for pedestrian accidents by improving variables which were used for general severity analysis. The existing variables were collected based on the interviews with policeman or witnesses and evidence of accidents. Therefore, existing variables were subjective and had several measurement errors. In order to improve such problems, this study collected variables from vehicle recorder of taxi which recorded the moment of accidents. As a result, explanatory power of independent variables was enhanced and the complete objective variables could be collected. After collecting variables, ordered probit model was developed by utilizing vehicle recorder database. Fitness of ordered probit model was 0.23. Vehicle speed and pedestrian's eye direction variables were the most critical factors for severity of pedestrian accident. In addition, severity analysis for vulnerable pedestrian was carried out. As a result, it was revealed that vehicle speed, pedestrian's eye direction and safety zone variables affected the severity of pedestrian accidents most. Particularly, vehicle speed variable is the most important factor. Consequently, driver's defensive driving and compliance to the regulations are the priority to reduce severity of pedestrian accidents and prevent pedestrian accident.
Motorcycle Accident Model at Roundabout in Korea using ZAM
Park, Byung Ho ; Lim, Jin Kang ; Na, Hee ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 107~113
DOI : 10.14346/JKOSOS.2014.29.3.107
The goal of this study is to develop the accident models of motorcycle at roundabouts. In the pursuing the above, this study gives particular attentions to developing the appropriate models using ZAM. The main results are as follows. First, the evaluation of various developed models by the Vuong statistic and over-dispersion parameter shows that ZINB is analyzed to be optimal among Poisson, NB, ZIP(zero-inflated Poisson) and ZINB regression models. Second, the traffic volume, width of central island and width of approach are evaluated to be important variables to the accidents. Finally, the common variables that affect to the accident are selected to be traffic volume and width of approach. This study might be expected to give some implications to the accident research on the roundabout by motorcycle.
A Study on the Fire Hazard of Transportation Oil
Park, Young Ju ; Hwang, Me Jung ; Lee, Hae Pyeong ; Lee, Seung Chul ; Lee, Chang Hyun ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 114~120
DOI : 10.14346/JKOSOS.2014.29.3.114
The purpose of this study is to conduct the study of the combustion and thermal characteristics through transportation oil for the analysis of fire hazard. Transportation oil breaks down into fuels such as diesel for civilian demands, gasoline, DF1(diesel for military), high sulfur diesel(for marine), kerosene and JP1(for aviation), and lubricants like brake fluid, power steering oil, engine oil, and automatic and manual transmission oil. The experiments of flash point, ignition point, flame duration time, heat release rate were carried out using TAG closed cup flash point tester(AFP761), Cleveland open cup auto flash point analyzer(AFP762), KRS-RG-9000 and Dual cone calorimeter. As a result, the fuel's ignition points were lower than lubricants, especially that of gasoline was not conducted as it has below zero one. Gasoline has the highest ignition point of about
, while the other fuels showed
. For flame duration time, lubricants had over 300 seconds, but fuels had less than 300 seconds except high sulfur diesel(350 seconds). Total heat release rate ranged
for lubricants and gasoline showed the highest total heat release rate,
A Study on the Implementation of Risk Assessment System at Workplace in Korea
Jung, Jin Woo ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 121~128
DOI : 10.14346/JKOSOS.2014.29.3.121
Risk assessment system which is the point of occupational safety and health management system is recognized to be effective to prevent industrial accident and occupational disease internationally. Ministry of Employment and Labor developed guidance on risk assessment at workplace recently. This guidance presents standard model on risk assessment at workplace. However, enterprises may be confronted with many questions in the process of introducing and operating risk assessment. For risk assessment to be implemented properly and effectively at workplace, there are various questions that need to be considered in advance, including giving shape to standard on risk evaluation and clarifying the implementation system at workplace in advance. Also for risk assessment to be revitalized at workplace, several policy matters need to be settled. First, an administrative agency should present the implementation method of risk assessment more concretely. Secondly, it is necessary for an administrative agency to develop and spread various detailed manual, models and good practices related to risk assessment. Thirdly, a government agency need to apply an incentive & disadvantage policy actively to risk assessment.
Development of Plant Abnormal Status Response System by Multi-Alarm Pattern in Main Control Room
Choi, Sun Yeong ; Jung, Wondea ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 129~135
DOI : 10.14346/JKOSOS.2014.29.3.129
The number of abnormal operation procedures (AOPs) for mitigating a plant abnormal status amounts to about one hundreds for the most of 1000MWe optimized power plant (OPR1000) and it is expected that the number of AOPs would be increased to cope with an abnormal status occurred newly. However, it is not well organized for operators to select a proper AOP from alarms occurred in main control room (MCR) during a plant abnormal status. It may be a burden to operators since the selection of AOP to respond an abnormal status is authorized by operators. When multiple alarms occur in MCR, it would take more time to respond them than a single alarm. To reduce the efforts, various MCR operation support systems have been developed. The purpose of this study was to develop a multi-alarm pattern card to select an appropriate AOP effectively when multiple alarms occurs in a single upper layout (UL) of MCR. It can be applied for an operation support tool as well as an education tool.
Sensitivity Analyses of Failure Probability of Pipes in Nuclear Power Plants using PRO-LOCA
Cho, Young Ki ; Kim, Sun Hye ; Park, Jai Hak ;
Journal of the Korean Society of Safety , volume 29, issue 3, 2014, Pages 136~142
DOI : 10.14346/JKOSOS.2014.29.3.136
Recently a new version of PRO-LOCA program was released. Using the program, failure probability of pipes can be evaluated considering fatigue and/or stress corrosion crack growth and the effects of various parameters on the integrity of pipes in nuclear power plants can be evaluated quantitatively. The analysis results can be used to establish an inspection plan and to examine the effects of important parameters in a maintenance plan. In this study, sensitivity analyses were performed using the program for several important parameters including sampling method, initial crack size, number of initial fabrication flaws, operation temperature, inspection interval, operation temperature and nominal applied bending stress. The effect of parameters on the leak and rupture probability of pipes was evaluated due to fatigue or stress corrosion crack growth.