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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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
Numerical Study on Ricochet Behavior with Inclined Impact of Polycabonate Plates
Yang, Tae-Ho ; Lee, Young-Shin ; Jo, Jong-Hyun ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 1~8
DOI : 10.14346/JKOSOS.2014.29.4.001
In this study, the numerical simulation using AUTODYN-3D program was investigated angle trajectory prediction for inclined impacts of projectiles. The penetration and perforation of polycarbonate plate by 7.62 mm projectile was investigated numerically. The characteristic structure of the projectile's trajectory in the polycabonate plates was studied. Two combined failure criteria were used in the target plate, and the target plate was modeled with the properties of polycarbonate for simulating the ricochet phenomenon. The effect of the angle of inclination on the trajectory and kinetic energy of the projectile were studied. The dynamic deformation behaviors tests of polycabonate were compared with numerical simulation results which can be used as predictive purpose. From the simulation, the ricochet phenomenon was occurred for angles of inclination of
. The projectile perforated the plate for
, thus defining a failure envelope for numerical configuration. The numerical analyses are used to study the effect of the projectile impact velocity on the depth of penetration (DOP). It can be observed that the residual velocities were almost linear relative to penetration velocities. It means that polycarbonate has high resistance at higher velocities.
Fatigue Strength of Al-5052 Tensile-Shear Specimens using a SPR Joining Method
Lee, Man Suk ; Kim, Taek Young ; Kang, Se Hyung ; Kim, Ho Kyung ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 9~14
DOI : 10.14346/JKOSOS.2014.29.4.009
Self-piercing riveting(SPR) is a mechanical fastening technique which is put pressure on the rivet for joining the sheets. Unlike a spot welding, SPR joining does not make the harmful gas and
and needs less energy consumption. In this study, static and fatigue tests were conducted using tensile-shear specimens with Al-5052 plates for evaluation of fatigue strength of the SPR joints. During SPR joining process for the specimen, using the current sheet thickness and a rivet, the optimal applied punching force was found to be 21 kN. And, the maximum static strength of the specimen produced at the optimal punching force was 3430 N. During the fatigue tests for the specimens, interface failure mode occurred on the top substrate close to the rivet head in the most high-loading range region, but on the bottom substrate close to the rivet tail in the low -loading range region. There was a relationship between applied load amplitude
and lifetime of cycle N for the tensile-shear,
. Using the stress-strain curve of the Al-5052 from tensile test, the simulations for fatigue specimens have been carried out using the implicit finite element code ABAQUS. The relation between von-Mises equivalent stress amplitude and number of cycles was found to be
Integrity Assessment on the Nuclear Transport Cask under the Ballistic Impact
Yang, Tae-Ho ; Lee, Young-Shin ; Lee, Hyun-Seung ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 15~22
DOI : 10.14346/JKOSOS.2014.29.4.015
As the risk of the various external risk was increased, a study on the integrity assessment of the nuclear transport cask was needed. In this paper, an integrity assessment of the nuclear transport cask under the ballistic impact was studied. The projectile with L/D = 5 was used in simulation. The applied head shapes of the projectile were five types such as flat shape, conical shape, hemispherical shape, truncated conical and sliced flat shape, respectively. The range on the velocity of the projectile was 85 m/s to 680 m/s. The cask body of the nuclear transport cask was not penetrated by the projectile speed up to Vprojectile = 510 m/s. As the cask body was penetrated by the all types projectile with Vprojectile = 680 m/s and the cask lead in the nuclear transport cask was collided with the projectile. As the projectile moved to 31.3 mm in the cask lead, the cask lead was not penetrated by the projectile with Vprojectile = 680 m/s. The integrity assessment on the nuclear transport cask under ballistic impact up to Vprojectile = 680 m/s was obtained.
Characteristics of the Microwave Induced Flames on the Stability and Pollutant Emissions
Jeon, Young Hoon ; Lee, Eui Ju ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 23~27
DOI : 10.14346/JKOSOS.2014.29.4.023
The use of electromagnetic energy and non-equilibrium plasma for enhancing ignition and combustion stability is receiving increased attention recently. The conventional technologies have adapted the electrical devices to make the electromagnetic field, which resulted in various safety issues such as high-maintenance, additional high-cost system, electric shock and explosion. Therefore, an electrodeless microwave technology has an advantage for economic and reliability compared with conventional one because of no oxidation. However, the application of microwave has been still limited because of lack of interaction mechanism between flame and microwave. In this study, an experiment was performed with jet diffusion flames induced by microwaves to clarify the effect of microwave on the combustion stability and pollutant emissions. The results show that microwave induced flames enhanced the flame stability and blowout limit because of abundance of radical pool. However, NOx emission was increased monotonically with microwave intensity except 0.2 kW, and soot emission was reduced at the post flame region.
Fatigue Characterization of NiTiCu Shape Memory Alloys
Han, Ji-Won ; Park, Sung Bum ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 28~33
DOI : 10.14346/JKOSOS.2014.29.4.028
Recently, the actuator worked by the driving recovery-force of the thermo elastic martensitic transformation of shape memory alloys(SMA) has been studied. This paper presents a study on the fatigue life of shape memory alloy (SMA) actuators undergoing thermally induced martensitic phase transformation under various stress levels. shape memory recoverable stress and strain of Ti-44.5at.%Ni-8at.%Cu alloys were by means of constant temperature tensile tests. Differential scanning calorimetry (DSC) was employed in order to investigate the transformation characteristics of the alloy before the tests. the results were summarized as follows. The martensite inducing stress incerased with the increasing of the Cu-contents. The fatigue life decreased with the increasing of the test load and the Cu-content. The data acquired will be very useful during the design process of an SMA NiTiCu element as a functional part of an actuator.
The Crack Behavior in the Planar Solid Oxide Fuel Cell under the Fabricating and Operating Temperature
Park, Cheol Jun ; Kwon, Oh Heon ; Kang, Ji Woong ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 34~41
DOI : 10.14346/JKOSOS.2014.29.4.034
The goal of this study is to investigate some crack behaviors which affect the crack propagation angle at the planar solid oxide fuel cell with cracks under the fabricating and operating temperature and analyze the stresses by 3 steps processing on the solid oxide fuel cell. Currently, there are lots of researches of the performance improvement for fuel cells, and also for the more powerful efficiency. However, the planar solid oxide fuel cell has demerits which the electrode materials have much brittle properties and the thermal condition during the operating process. It brings some problems which have lower reliability owing to the deformation and cracks from the thermal expansion differences between the electrolyte, cathode and anode electrodes. Especially the crack in the corner of the electrodes gives rise to the fracture and deterioration of the fuel cells. Thus it is important to evaluate the behavior of the cracks in the solid oxide fuel cell for the performance and safety operation. From the results, we showed the stress distributions from the cathode to the anode and the effects of the edge crack in the electrolyte and the slant crack in the anode. Futhermore the crack propagation angle was expected according to the crack length and slant angle and the variation of the stress intensity factors for the each fracture mode was shown.
Analysis of Electrical Equipment and Work Environment for Domestic Small-Scale Construction Site
Kim, Doo-Hyun ; Hwang, Dong-Kyu ; Kim, Sung-Chul ; Kang, Shin-Uk ; Choi, Sang-Won ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 42~47
DOI : 10.14346/JKOSOS.2014.29.4.042
This paper is aimed to investigate and analyze of characteristic for electrical equipment and work environment for the small-scale site. In order to investigate and analyze electrical equipment and work environment for preventing electric shock disaster in construction sites, 50 small-scale construction sites and 12 large-scale construction sites are selected. This paper completed site investigations of low-voltage equipment and the portable electric machine and equipment in 12 large-scale construction sites and 50 small-scale construction sites. The findings were about the electric shock environment relevant to the ground-relevant equipment, the panel board, the protection tools, the sockets, the temporary wiring system, the portable and movable electric machines and equipments in small-scale construction sites. Finally, this study analyzed the domestic and foreign relevant standards and regulations and these findings can be utilized as educational data warning electric shock risk caused by electric equipment in small-scale construction site.
Thermal Characteristics of Electric Wiring for Halogen Warm Lamp Group and Automatic Waterer Group at Stable
Kim, Doo-Hyun ; Yoo, Sang-Ok ; Kim, Sung-Chul ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 48~53
DOI : 10.14346/JKOSOS.2014.29.4.048
This study is analyzed for electrical fire danger by electric equipments through surveys of stable owners and the field investigation at 64 stable. Also, an experiment is performed to analyze the thermal characteristics of 4 types electric wiring according to the number of operating halogen warm lamp group and automatic waterer group in Beon-young stable in the Cheongwon location. The survey is done to investigate the occurrence of electrical fire, electric equipment, causes and dangerous equipment. As a result, halogen warm lamp group and automatic waterer group are found to have dangerous loads. In the field investigation, the mode of load capacity of the halogen warm lamp group and automatic waterer group was investigated. The mode of load capacity of halogen warm lamp group (over 3 years) is found 17A and that of the auto waterer group (10 years) is 16A. In this experiment, the halogen warm lamp group aged at least 3 years showed
while that aged less than 1 year appeared
, showing the max gap of
. The automatic waterer group aged 10 years showed
while that aged less than 1 year appeared
, showing the max gap of
. These findings indicate that the mode of load capacity needs to be considered in selecting and installing wiring for the electric equipment construction of halogen warm lamp group and automatic waterer group in stable.
Analysis of Electric Shock Accident on 4.16 kV Class Circuit breaker for Power Plant
Park, Nam-Kyu ; Song, Jae-Yong ; Kim, Jin-Pyo ; Goh, Jae-Mo ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 54~60
DOI : 10.14346/JKOSOS.2014.29.4.054
This paper describes electric shock accidents on a 4.16 kV class circuit breaker for power plant. Electric shock accidents mostly involve damage of human life, in comparison with electrical fire, rate of human death tend to be higher in electric shock accidents. Specially, in a high voltage facilities rate of human death comprised about 43.7% by electric shock accidents. If electric shock accidents happen in a 4.16 kV class circuit breaker for power plant, then the power plant discontinue power production. Electric shock accidents in a power plant have a great ripple effect such as an electric power shortage. In this paper, we analyzed electric shock accidents on a 4.16 kV class circuit breaker for power plant. From the analysis results, we confirmed a cause of electric shock accidents on a 4.16 kV class circuit breaker, it happened by defect of interlock equipment or occurrence of breakdown between first feeder contactor and shielding plate. In order to reduce electric shock accidents on a 4.16 kV class circuit breaker, the power plant should consider improvement of interlock equipment and insulation of feeder contactor in circuit breaker.
Thermal Characteristics Analysis of Pre-Treated Rayon Fibers for Preparing Activated Carbon Fibers
Choi, Sang Seun ; Lee, Soon Hong ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 61~72
DOI : 10.14346/JKOSOS.2014.29.4.061
The aim of this study is to define the condition of optimal pre-treatment for preferable activated carbon fibers (ACFs), which are based on rayon fibers. This paper shows the ideal path of ACFs preparation process; implies that rayon fibers are pre-treated by various solvents with different times before the heating process. The pre-treated rayon fibers finally turned into desirable rayon fiber-based ACFs through optimal pre-treatment condition by heating processes. The thermal analysis method of pre-treated rayon fibers by thermo-gravimetry analyser (TGA) is an idealized tool, which analyzes the best thermal condition of pre-treatment process. Surface morphologies of resulting rayon fibers based ACFs were examined by scanning electron microscope(SEM). The results of TGA and SEM analyses show that the optimal pre-treatment condition for preparing ACFs was clearly defined, in terms of thermal stability and surface morphology.
Principal Component Analysis Based Method for Effective Fault Diagnosis
Park, Jae Yeon ; Lee, Chang Jun ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 73~77
DOI : 10.14346/JKOSOS.2014.29.4.073
In the field of fault diagnosis, the deviations from normal operating conditions are monitored to identify the type of faults and find their root causes. One of the most representative methods is the statistical approaches, due to a large amount of advantages. However, ambiguous diagnosis results can be generated according to fault magnitudes, even if the same fault occurs. To tackle this issue, this work proposes principal component analysis (PCA) based method with qualitative information. The PCA model is constructed under normal operation data and the residuals from faulty conditions are calculated. The significant changes of these residuals are recorded to make the information for identifying the types of fault. This model can be employed easily and the tasks for building are smaller than these of other common approaches. The efficacy of the proposed model is illustrated in Tennessee Eastman process.
Efficiency of Water Mist Suppression System Containing Viscosity Agent to Extinguish Wood Cribs Fire
Kim, Min Hyung ; Shin, Changsub ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 78~84
DOI : 10.14346/JKOSOS.2014.29.4.078
Viscosity agents were added to water to improve extinguishing performance of low pressure water mist suppression system on wood cribs fire, and a small scale wood cribs fire experiment was conducted to measure the extinguishing performance. CMC and agar were used for viscosity agent and as the amount of viscosity agent enlarges, it showed the increase of the viscosity of aqueous solution and the decrease of the fluidity. On wood cribs fire experiment, the extinguishing efficiency was improved with supplemental viscosity agent as it enhanced the adhesive time of aqueous solution on the wood, and therefore expanded the contact time of fire surface. The surface tension of aqueous solution was decreased with the addition of agar which to be assumed as an increase factor of extinguishing efficiency. By the extinguishing experimental result, the most effective extinguishing agent was CMC 0.6 wt.%, with the flame suppression time and the extinguishing time were reduced by 70s and 93s respectively at this concentration.
The Measurement of Combustible Properties of Acetic Anhydride for the Compatibility of MSDS
Ha, Dong-Myeong ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 85~90
DOI : 10.14346/JKOSOS.2014.29.4.085
For the safe handling of acetic anhydride, this study was investigated the explosion limits of acetic anhydride in the reference data. And the lower flash points, upper flash points, and AITs(auto-ignition temperatures) by ignition delay time were experimented. The lower and upper explosion limits of acetic anhydride by the investigation of the literatures recommended 2.9 Vol% and 10.3 Vol.%, respectively. The lower flash point of acetic anhydride by using Setaflash closed-cup tester was experimented
. The lower flash point acetic anhydride by using Tag and Cleveland open cup tester were experimented
, respectively. Also, this study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for acetic anhydride. The experimental AIT of acetic anhydride was
Comparison of Experimental and FDS Data for Calculating Heat-Affected Range in Forest Fires
Kim, H.S. ; Kang, Y.J. ; Kim, J.H. ; Kim, K.H. ; Lee, B.D. ; Kim, Jeong Hun ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 91~96
DOI : 10.14346/JKOSOS.2014.29.4.091
This research deals with the combustion experiment of pine trees, which are the most representative species in Korea. Experimental data are compared with theoretical ones using Fire Simulation Program(FDS). It is considered that horizontal/vertical temperature distribution and radiant heat influence on adjacent areas in fire scenes. The linear function for separation distance to temperature was drawn by applying Stefan-Boltzmann's law;
for calculating the separation distance. In combustion experiment, the radiant heat came to
in case of the separation distance by one meter. The numerical values mean that human body show the critical level of pain after one minute without a protective equipment.
Survey and Analysis about the Safety Perception and Attitude of Managers in Construction Site
Choi, Jin-Woo ; Park, Chan-Sik ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 97~102
DOI : 10.14346/JKOSOS.2014.29.4.097
The aim of this study is to survey and analyze the safety perception and attitude of the construction managers for the purpose of contributing to the construction industry accident prevention by inducing safety behaviors of managers. The data analysis found that there were significant differences on safety perception and attitude depending on job positions. This survey found that job position and career affect the safety perception and attitude of manager. Further analysis revealed job position has more an effect on it than career. Therefore, in order to improve the safety perception and attitude of managers, it is effective to put managers more responsibility on safety.
Mechanical Properties and Carbonation Resistance of Water-Soluble Sulfur Concrete
Hong, Ki Nam ; Ji, Se Young ; Park, Jae Kyu ; Jung, Kyu San ; Han, Sang Hoon ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 103~109
DOI : 10.14346/JKOSOS.2014.29.4.103
In this study, two types of water-soluble sulfur, LSA and LSB, were developed and the influence of the water-soluble sulfur on the mechanical properties and durability of concrete were experimentally evaluated. In order to evaluate mechanical properties and carbonation resistance of concrete with water-soluble sulfur, compressive strength test, flexural strength test, bonding strength test, and carbonation resistance test were performed. Compressive strength of only concrete with 1% LSA was increased while that of concrete with LSB was proportionally increased with the higher LSB dosage. On the other hand, flexural strength of concrete with LSA and LSB was increased by 12-41% and 36-74%, respectively. Carbonation resistance of concrete with water-soluble sulfur were increased by 25-66%. As a result, it should be noted that the water-soluble sulfur can not only solve the demerit of sulfur concrete but also offer the durability of sulfur concrete.
Procedure of Seismic Performance Evaluation of LNG Receiving Terminal Facilities
Lee, Tae-Hyung ; Lee, Eunsuk ; Park, Taekyu ; Hong, Seong Kyeong ; Kim, Joonho ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 110~115
DOI : 10.14346/JKOSOS.2014.29.4.110
It is crucial for important facilities to withstand strong earthquakes because their damage may cause undesirable socio-economic effect. A liquefied natural gas (LNG) receiving terminal is one of the lifeline facilities whose seismic safety needs to be guaranteed. Even though all operating LNG receiving terminals in Korea were seismically designed, old design codes do not guarantee to comply with the current seismic design codes. In addition, if the constructional materials have been deteriorated, the seismic capacity of facilities may be also deteriorated. Therefore, it is necessary that the seismic performance of LNG receiving terminals is evaluated and the facilities that lack of seismic capacity have to be rehabilitated. In this paper, a procedure of seismic performance evaluation of such facilities is developed such that the procedure consists of three phases, namely pre-analysis, analysis, and evaluation phases. In the pre-analysis phase, design documents are reviewed and walk-on inspection is performed to determine the current state of the material properties. In the analysis phase, a structural analysis under a given earthquake or a seismic effect is performed to determine the seismic response of the structure. In the evaluation phase, seismic performance of the structure is evaluated based on limit states. Two of the important facilities, i.e. the submerged combustion vaporizer (SMV) and pipe racks of one of the Korean LNG receiving terminals are selected and evaluated according to the developed procedure. Both of the facilities are safe under the design level earthquake.
System Reliability Analysis of Rack Storage Facilities
Ok, Seung-Yong ; Kim, Dong-Seok ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 116~122
DOI : 10.14346/JKOSOS.2014.29.4.116
This study proposes a system reliability analysis of rack storage facilities subjected to forklift colliding events. The proposed system reliability analysis consists of two steps: the first step is to identify dominant failure modes that most contribute to the failure of the whole rack facilities, and the second step is to evaluate the system failure probability. In the first step, dominant failure modes are identified by using a simulation-based selective searching technique where the contribution of a failure mode to the system failure is roughly estimated based on the distance from the origin in the space of the random variables. In the second step, the multi-scale system reliability method is used to compute the system reliability where the first-order reliability method (FORM) is initially used to evaluate the component failure probability (failure probability of one member), and then the probabilities of the identified failure modes and their statistical dependence are evaluated, which is called as the lower-scale reliability analysis. Since the system failure probability is comprised of the probabilities of the failure modes, a higher-scale reliability analysis is performed again based on the results of the lower-scale analyses, and the system failure probability is finally evaluated. The illustrative example demonstrates the results of the system reliability analysis of the rack storage facilities subjected to forklift impact loadings. The numerical efficiency and accuracy of the approach are compared with the Monte Carlo simulations. The results show that the proposed two-step approach is able to provide accurate reliability assessment as well as significant saving of computational time. The results of the identified failure modes additionally let us know the most-critical members and their failure sequence under the complicated configuration of the member connections.
A Study on the Automatic Measurement of Solid Content in Recycled Water in Ready Mixed Concrete Plant
Choi, Young-Cheol ; Moon, Gyu-Don ; Cho, Bong-Seok ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 123~131
DOI : 10.14346/JKOSOS.2014.29.4.123
Whole amount of waste water, approximately 921.6 liter, for cleaning a ready mixed concrete truck should be used to produce concrete as a mixing water or cleaning water. Recycling water for concrete mixing contains solids, which cause decrease in slump, air and compressive strengths, so it may influence on poor concrete quality. Therefore, it has been maintained to use recycling water with less than 3 percent of solids. Since no evaluation system has been constructed to directly reflect on variability of recycling water from ready mixed concrete plants, it is necessary to develop "Automatic recycling solid measuring system" for quality controls in real time. In this research, sensors measuring waste water concentration in ultrasonic and inductance methods were developed, and automatic system using the sensors were established. The accuracy of measurement sensors developed for recycling water based on various conditions of concentration was proved, and application limits were evaluated. Also, concentration of recycling water using sensors developed from ready mixed concrete plant was measured, and curing method verified the accuracy of the sensors. Moreover, measurement sensors for recycling water in various locations were installed to evaluate the effects on measuring method and spots. The automatic measuring system for recycling water concentration, which is developed in the research, will contribute to improve concrete quality safety through reliable solids maintenance.
The Analysis on the Unsafe Acts of Laborers at Domestic Construction Sites
Han, I.H. ; Yang, G.N. ; Cho, H.G. ; Jung, G.H. ; Kim, G.H. ; Shin, Yoonseok ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 132~139
DOI : 10.14346/JKOSOS.2014.29.4.132
According to the increase of foreign laborers at domestic construction sites, it's necessary to research in terms of the unsafe acts of both Korean and foreign laborers in order to prevent construction disasters. The objective of this study is to clarify the characteristics and the improvement priority of the unsafe acts using IPA(Importance-Performance Analysis). The result of this study showed which items of unsafe acts are identify difference between Korean and foreign laborers. Moreover, the result of IPA also showed items of unsafe acts that needed the immediate improvement for each one. Especially there are two items, i.e. equipment malfunction and wrong handling of hand tools, which both Korean and foreign laborers think simultaneous those needs improvement. The results can be utilized to plan and to improve the safety management and education at a site considering the characteristics of foreign laborers.
A Case Study of Developing E-Learning Contents of Agricultural Safety and Health based on Risk Assessment
Kim, J.H. ; Lee, K.S. ; Kim, D.M. ; Lee, K.S. ; Kong, Y.K. ; Jung, M.C. ; Lee, Inseok ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 140~146
DOI : 10.14346/JKOSOS.2014.29.4.140
This paper presents a case study to develop e-learning contents of agricultural safety based on the assessment of risks of 4 selected crops and stock farming: rice, potatoes, apples, tomatoes and stock raising. The aged farmers, who are main workforce of current Korean agriculture and relatively more vulnerable to various risks of agricultural work compared to younger workers, were considered as the main users of the contents in developing them. The safety guidelines were presented as simple as possible and the interfaces were designed to be simple and easy to use so that the older users can use it without much difficulty. In making the scenarios of the contents, risk assessments were carried out for each crop and stock farming with the focus being on occupational diseases rather than accidental injuries. To make the contents more attractive to the farmers, the functions requiring active responses from the users, such as answering simple questions, were included in the contents. Usability evaluation by experts of ergonomics and agricultural tasks were carried out in modifying the draft version, whereas formal usability test was not included in the case study. Though there are some limitations in the developed contents in the aspects of evaluation of usability and effectiveness, this case study shows the structured procedure of developing e-learning safety contents based on the risk assessments on agricultural tasks. The developed e-learning contents are expected to be used practically and easily in educating and training older farmers about safety and health of agricultural tasks.
Research on the Characteristics of Working Conditions and Occupational Safety and Health in the Special form Workers
Yi, Kwan Hyung ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 147~152
DOI : 10.14346/JKOSOS.2014.29.4.147
The purpose of this study, the overall occupational safety and health status and identify the characteristics of the workers engaged in the field of quick services, substitute driving services, home delivery, caregiver, film and television arts, to take appropriate measures to prevent industrial accidents, profession and working environment, safety recognition and education, and safety activities, accident experience and job stress survey. Survey using a structured questionnaire, 846 people directly interview research. Safety consciousness level of himself or herself was "fair level" of 3.19 points and those of colleagues and the general public were evaluated to be low as 2.84 points and 2.54 points, respectively. During the last 12 months, 21.3% of total workers in 5 job categories have received an industrial safety health education for job-related accident or disease and 87.6% of workers engaged in caregiver have received an industrial safety health education for job-related accident or disease. The proportions for delivery worker, substitute driving service and quick service/cultural art were 26.4%, 12.1% and below 10%, respectively. Frequency of having received an education was 5.7 days on average and education hour was 9.2. Regarding cases of having experienced job-related accident or having been exposed to job-related disease over the past 1 year, 17.0% of total respondents have experienced accident and 21.3% have experienced job-related disease. Preventive education for occupational safety is required to be expanded and strengthened. Except caregiver, the proportion of having received an information and education for safety rules and hazardous factors. Safety education is urgently required in order to prevent and reduce accident. Safety and health guideline is required to be developed and disseminated in order to prevent accident in advance.
The Development of a SVR-based Empirical Model for the Effect of the Unbalanced Floor Height on MVC of Lifting Task
Oh, Hyunsoo ; Chang, Seong Rok ; Kim, Younghwan ; Lee, Chang Jun ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 153~159
DOI : 10.14346/JKOSOS.2014.29.4.153
Low back pain is one of major issues in musculoskeletal diseases mainly caused by MMH (Manual Material Handling) tasks. In Korea, the standards of NIOSH(National Institute for Occupational Safety and Health) Lift Equations in U. S. A. have been most widely used. However, there is no standard in case the height of one feet is higher than that of another one. Moreover, since the standards are developed in U. S. A., there are many limitations for the applicability of Korean workers. In this study, MVC(Maximum Voluntary Contraction) for four postures are measured and an empirical model based on SVR(Support Vector Regression) is constructed. Constructing SVR model, PSO(Particle Swarm Optimization) is employed to investigate the optimal parameters of SVR. The results show that the performance of this empirical model is approximately accurate, even if the deviation of experimental values is large due to the individual differences. This empirical model may contribute to establish the standards of MMH tasks in Korea.
A Model of Operational Situation Analysis with Functional Safety for ASIL Determination
Baek, Myoung-Sig ; Jang, Hyeon Ae ; Kwon, Hyuck Moo ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 160~167
DOI : 10.14346/JKOSOS.2014.29.4.160
To determine a proper ASIL for each hazardous event with a proper safety goal, the right classes should first be determined for the three properties of the hazardous event; (i) severity of harm from the resultant accident, (ii) exposure to the relevant operational situation, and (iii) controllability to avoid the induced risks. ASIL can be clearly determined with right classes of these three properties. But no specific methodologies or processes for their classification can be found in ISO 26262, except only a rough guideline with a simplified set of illustrative tables. In this paper, we try to present a systematic model for classifying the three properties of the hazardous event and suggest a refined procedure of ASIL determination. The proposed model provides a specific method to get a more objective ASIL compared with that in the standard. Scrutinizing the current methodology, we develop a refined method and also provide an illustrative example.
A Study of the Job Stress in Auto Part Manufacturing Company
Kim, Daesik ; Kim, Yuchang ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 168~171
DOI : 10.14346/JKOSOS.2014.29.4.168
The job stress is rising as a social issue in all industries. So many manufacturing companies have been trying to prevent the job stress. Recently, the job stress is the important cause which lead to WMSDs, depressive disorder, anxiety disorder and sleep disturbance. However, the cause of the job stress is very variety. So management is very difficult. The purpose of this study is to investigate the group of the job stress by Karasek model from workers in auto part manufacturing company. The survey was using Karasek job stress model and was administered to 181 workers of auto part manufacturing company. Job demand median and job decision median was in 30.0 and 50.0. From this study, following results were obtained. 1) The gender of workers according to the groups of job stress was statistically significant(p<0.05). 2) The duration of working of workers according to the groups of job stress was statistically significant(p<0.05). 3) The intensity of work of workers according to the groups of job stress was statistically significant(p<0.01). The result of this study will help to identify the group of job stress and improve personal coping ability, systematic measure of company.
An Investigation of the Regulation, Design and Improvement of Domestic and International Ambulances
Shin, Dong-Min ; Kim, Seung-Yong ; Han, Yong-Taek ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 172~179
DOI : 10.14346/JKOSOS.2014.29.4.172
This research suggests that the regulation, design and improvement of domestic and international ambulances so that make the basis for the future ambulance in Korea. It is true that the diversification of current disasters, increasing elderly population, the increase in emergency patients, due to the lack of effective transfer system, emergency vehicle's performance problem, and the aging of ambulances cause have difficulty in providing effective emergency services in domestic country. Therefore, in order to improve the effectiveness of ambulance, the history of ambulance, other relevant provisions include international, design and directions to be improved were investigated, and also research directions of the ambulance are suggested in domestic country. In this research, suggests the following conclusions to improve domestic ambulance 1. Through standardization of the spacing and location of an ambulance is needed to maximize the treatment room. 2. The interior of the ambulance design for hygiene and infection control should be included. 3. Stretcher and equipment are designed to be fitted to each other should be standardized. 4. Especially during transfer maintain the road, noise, vibration, and shock-absorbing function to emphasize the importance. 5. The improvement of ergonomic design is necessary for the possibility of applying to many people.
A Study of the Human Body Safety and Effectiveness for Scattering Objects on Missile Ejection Round
Chung, Sung-Hak ; Yun, Hyo-Suk ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 180~183
DOI : 10.14346/JKOSOS.2014.29.4.180
The purpose of this study is to assess for scattering object for the missile ejection round due to analysis of the human body effectiveness safely. To achieve this goal the measurement method of scattering objects by comparative 2 measurement methods studied, the risk of scattering of the object is evaluated. Result of this study, applied in Europe and Japan, based on the safety criteria for the human body effectiveness when missile ejection round. data showed is not effectiveness to the operator's body safely. Data showed that satisfies the safety criteria for missile ejection round in Europe and Japan through the similarity for the case studies. In case of these safety criteria does not exist regulation in South Korea, this study will be referred as guidelines are considered.
Comprehensive Assessment on Risk Factors using Fuzzy Inference in Decommissioning Process
Lim, Hyeon Kyo ; Kim, Hyunjung ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 184~190
DOI : 10.14346/JKOSOS.2014.29.4.184
Decommissioning process of nuclear facilities consist of a sequence of problem solving activities, because there may exist not only working environments contaminated by radiological exposure but also industrial hazards such as fire, explosions, toxic materials, and electrical and physical hazards. Therefore, not a few countries in the world have been trying to develop appropriate counter techniques in order to guarantee safety and efficiency of the process. In spite of that, there still exists neither domestic nor international standard. Unfortunately, however, there are few workers who experienced decommissioning operations a lot in the past. As a solution, it is quite necessary to utilize experts' opinions for risk assessment in decommissioning process. As for an individual hazard factor, risk assessment techniques are getting known to industrial workers with advance of safety technology, but the way how to integrate those results is not yet. This paper aimed to find out an appropriate technique to integrate individual risk assessment results from the viewpoint of experts. Thus, on one hand the whole risk assessment activity for decommissioning operations was modeled as a sequence of individual risk assessment steps which can be classified into two activities, decontamination and dismantling, and on the other, a risk assessment structure was introduced. The whole model was inferred with Fuzzy theory and techniques, and a numerical example was appended for comprehension.
A Study on the Risk-Management Based of Relief Train Operation
Jeon, Young Seok ; Lee, Hi Sung ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 191~198
DOI : 10.14346/JKOSOS.2014.29.4.191
In the event of continued train operation being impossible as the result of a breakdown, it will be essential to dispatch a relief train to recover the broken down train. Operation of relief train carries with the risk of collision in the process of connection with broken down train. The present study looks at the suitability of risk management procedures and associated problems in the light of case studies of relief train operation, and of national legal standards and railroad company regulations. It looks at appropriate methods of risk management and the problems that can arise. Based on the study a method is proposed of operating the relief train which is consistent with appropriate risk management. The proposed method will improve the safety of relief train operation, It is hoped that the results of the study will be reflected in relevant laws and operating company regulations, and so contribute to enhancing the overall level of railroad safety.
Fire Simulations for the Abandonment Risk Assessment of Main Control Room Fire in Domestic Nuclear Power Plant
Kang, Dae Il ; Kim, Kilyoo ; Jang, Seung-Cheol ; Yoo, Seong Yeon ;
Journal of the Korean Society of Safety , volume 29, issue 4, 2014, Pages 199~207
DOI : 10.14346/JKOSOS.2014.29.4.199
In this paper, to systematically assess the abandonment risk of main control room (MCR) fire, fire simulations with Fire Dynamics Simulator were performed and abandonment probabilities were estimated for the MCR bench-board fire of domestic reference nuclear power plant. The fire simulation scenarios performed in this study included propagating and non-propagating fires of the MCR bench-board, and the availability and unavailability of heating, ventilation, and air conditioning system (HVACS). The following results were obtained. First, temperature was the major abandonment impact factor for the MCR bench-board fire if the HVACS was available and optical density was that if the HVACS was unavailable. Second, the fire scenario contributing the MCR bench-board fire abandonment risk was identified to be only the propagating fire. Third, it was confirmed that the abandonment probability of the MCR bench-board fire for domestic reference nuclear power plant could be reduced by using the fire modeling.