Go to the main menu
Skip to content
Go to bottom
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 30, Issue 6 - Dec 2015
Volume 30, Issue 5 - Oct 2015
Volume 30, Issue 4 - Aug 2015
Volume 30, Issue 3 - Jun 2015
Volume 30, Issue 2 - Apr 2015
Volume 30, Issue 1 - Feb 2015
Selecting the target year
Fatigue Strength Evaluation of Self-Piercing Riveted Al-5052 Joints
Kang, Se Hyung ; Hwang, Jae Hyun ; Kim, Ho Kyung ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 1~6
DOI : 10.14346/JKOSOS.2015.30.3.1
Self-piercing riveting (SPR) is receiving more recognition as a possible and effective solution for joining automotive body panels and structures, particularly for aluminum parts and dissimilar parts. In this study, static strength and fatigue tests were conducted using coach-peel and cross-tension specimens with Al-5052 plates for evaluation of fatigue strength of the SPR joints. For the static experiment results, the fracture modes are classified into pull-out fracture due to influence of plastic deformation of joining area. During the fatigue tests for the coach-peel and cross-tension specimens with Al-5052, interface failure mode occurred on the top substrate close to the rivet head in the most cycle region. There were relationship between applied load amplitude
and life time of cycle N,
were for the coach-peel and cross- tension specimens, respectively. The finite element analysis results for specimens were adopted for the parameters of fatigue lifetime prediction. The relation between SWT fatigue parameter and number of cycles was found to be
Influence of Residual Bending Fatigue Strength on Impact Damage of CFRP Composites
Yang, Yong Jun ; Yang, In Young ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 7~12
DOI : 10.14346/JKOSOS.2015.30.3.7
CFRP composites are used as primary structural members in various industrial fields because their specific strength and specific stiffness are excellent in comparison to conventional metals. Their usage is expanding to high added-value industrial fields because they are more than 50% lighter than metals, and have excellent heat resistance and wear resistance. However, when CFRP composites suffer impact damage, destruction of fiber and interface delamination occur. This causes an unexpected deterioration of strength, and for this reason it is very difficult to ensure the reliability of the excellent mechanical properties. Therefore, for the destruction mechanism in bending with impact damage, this study investigated the reinforcement data regarding various external loads by identifying the consequential strength deterioration. Specimens were damaged by impact with a steel ball propelled by air pressure. Decrease in bending strength caused by the tension and compression of the impact side, and depending on the lamination direction of fiber and interface inside the specimen. From the bending test it was found that the bending strength reduced when the impact energy increased. Especially in the case of compression on the impact side, as tensile stress occurred at the damage starting point, causing rapid failure and a substantially reduced failure strength.
A Study on the Maintenance Policy Considering the Failure Data of the EMU Braking System and the Cost Function
Han, Jae-Hyun ; Kim, Jong-Woon ; Koo, Jeong-Seo ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 13~19
DOI : 10.14346/JKOSOS.2015.30.3.13
Railway vehicle equipment goes back again to the state just before when failure by the repair. In repairable system, we are interested in the failure interval. As such, a statistical model of the point process, NHPP power law is often used for the reliability analysis of a repairable system. In order to derive a quantitative reliability value of repairable system, we analyze the failure data of the air brake system of the train line 7. The quantitative value is the failure intensity function that was modified, converted into a cost-rate function. Finally we studied the optimal number and optimal interval in which the costs to a minimum consumption point as cost-rate function. The minimum cost point was 194,613 (won/day) during the total life cycle of the braking system, then the optimal interval were 2,251days and the number of optimal preventive maintenance were 7 times. Additionally, we were compared to the cost of a currently fixed interval(4Y) and the optimum interval then the optimal interval is 3,853(won/day) consuming smaller. In addition, judging from the total life, "fixed interval" is smaller than 1,157 days as "optimal interval".
Development and Its Characterization of a Worker's Safety Activity Detection Apparatus using Smart Phone
Choi, Sang-Won ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 20~25
DOI : 10.14346/JKOSOS.2015.30.3.20
It is predicted the mass retirement of the post-war generation and the lack of young people according to reduces the recruitment. Therefore, industry fields are concerned by the low level of occupational safety and health from issued problem in a variety of industries; the charge of expanding business range/multi-functional, black box of technology, difficulty of systematic training, relative decrease in the skill of workers, loss of know-how in the field of information followed restricted site information. In response to these problems, it is necessary to establish the long-termly and actively based on for the adoption of a safety and health management techniques utilizing IT, which is digital assistant(tablet PC, PDA, etc.), RFID/USN/ICT, database systems, and etc. In this study, we developed and evaluated a worker's safety sensing apparatus using smart phone. The apparatus may be useful to prevent accidents in the construction industry as well as confined space work.
Analysis of Voltage Drop and Thermal Characteristics for Poor Connections at Electrical Connector of Circuit Breaker of Small Size Pulverizer below 5.5kW
Kim, Sang Chul ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 26~31
DOI : 10.14346/JKOSOS.2015.30.3.26
This paper describes the characteristics of voltage drop and thermal for poor connection on electrical connector of circuit breaker in control box of small size pulverizer. In order monitor, we did the changes of RMS in voltage and temperature value with video and made normal state over
and poor connections state below
by screw gage. In case of voltage signal, the voltage drop was increased when the current was increased due to poor connections. In case of temperature signal, the temperature difference indicates ten times at 5A and fourteen times at 15A in the normal state. According to increase thermal energy, the insulation of electrical wiring and connector of circuit breaker can be carbonized. The results of this study will be useful to the development of preventive devices and system for electric fire by poor connection at small size pulverizer.
The Research of Optimal Plant Layout Optimization based on Particle Swarm Optimization for Ethylene Oxide Plant
Park, Pyung Jae ; Lee, Chang Jun ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 32~37
DOI : 10.14346/JKOSOS.2015.30.3.32
In the fields of plant layout optimization, the main goal is to minimize the construction cost including pipelines as satisfying all constraints such as safety and operating issues. However, what is the lacking of considerations in previous researches is to consider proper safety and maintenance spaces for a complex plant. Based on the mathematical programming, MILP(Mixed Integer Linear Programming) problems including various constraints can be formulated to find the optimal solution which is to achieve the best economic benefits. The objective function of this problem is the sum of piping cost, pumping cost and area cost. In general, many conventional optimization solvers are used to find a MILP problem. However, it is really hard to solve this problem due to complex inequality and equality constraints, since it is impossible to use the derivatives of objective functions and constraints. To resolve this problem, the PSO (Particle Swarm Optimization), which is one of the representative sampling approaches and does not need to use derivatives of equations, is employed to find the optimal solution considering various complex constraints in this study. The EO (Ethylene Oxide) plant is tested to verify the efficacy of the proposed method.
A Study on the Heat Release Characteristic of Household Items using LSC(Large Scale Cone Calorimeter)
Park, Ju Young ; Baek, Chang Sun ; Lee, Hae Pyeong ; Hong, Yi Pyo ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 38~44
DOI : 10.14346/JKOSOS.2015.30.3.38
For this study, fire tests were performed targeting household items (Sofa, Drawer, Refrigerator, Washing machine) using a large cone calorimeter (Large Scale Cone Calorimeter, LSC). The data were obtained focusing on the fire characteristic of the data when the actual fire occurs. The study results showed the following mean HRR of the household items; drawer 2843 KW, sofa 2939 KW, washing machine 719 KW, refrigerator 2907 KW, and THR is found in sofa 2202 MJ, drawer 1559 MJ, refrigerator 1193 MJ, washing machine 627 MJ. From the result, it could be found that the sofa can cause significant heat generation when the fire occurs, and the flashover tendency was found relatively high in compartment fire. In addition, a weight of the four our household items was reduced sharply in a similar time (20min before and after) degree after ignition. The drawer and sofa which has a high heat release can be considered to speed up the fire spread as their weight decrease rapidly and showed relatively weak to the fire compared to the refrigerator and washing machine.
A Study on the Flame Growth Characteristics of Household Items(Refrigerator·Washing machine·Drawer·Sofa)
Park, Young Ju ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 45~51
DOI : 10.14346/JKOSOS.2015.30.3.45
This study was full-scale combustion test for flame growth characteristics and temperature characteristics analysis to predict the risk of household Items fire when fire occurs. Experimental results, Refrigerator flames were the highest measured in 15 min time, and Washing machine is between 20 ~ 30 min, Drawer is 5 min, Sofa was enabled up to the size of the flame 15 min. In addition, the maximum combustion temperature was found from the time 20 min ~ 25 min, Sofa is temperature was elevated up to
, Refrigerator is
, Drawer is
, Washing machine appeared to be rising up to
. Therefore, in the case of the maximum temperature of combustion Sofa it showed relatively high.
Effect of Land Slope on Propagation due to Debris Flow Behavior
Lee, Jun Seon ; Song, Chang Geun ; Kim, Hong Teak ; Lee, Seung Oh ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 52~58
DOI : 10.14346/JKOSOS.2015.30.3.52
As sudden rainfall has happened, the debris flow has occurred in the mountain area. Recently sudden rainfall occurred so frequently caused by abnormal climate. Thus debris flow hazard had consecutively increased damage because of debris flow. Recently, Enormous damage due to debris flow have occurred in Korea. Various studies have been conducted to prevent search debris flow hazard. This study was carried out for debris flow behavior according to the land slope on propagation. It is the important one among factors that are related to the propagation over the city with respect to debris flow discharge and depth. For the numerical simulations in this study, the land slope was varied of 5, 0,
to investigate the debris flow behavior with the FLO-2D, often recommended by FEMA to simulate debris flow. To verify the performance of FLO-2D, comparison with the USGS experiments (Iverson et al, 2010) was conducted. From numerical results the propagation length of the debris flow was found the most sensitive one. Maximum of debris flow thickness and velocity and structural vulnerabilities were investigated to the effect of land slope. They was became smaller according to land slope of 5, -5,
in the order. As a result, debris flow behavior analysis about the effect of the land slope could contribute to understand the vulnerability of city for debris flow hazards.
The Effective Control of Hot Weather Concreting by Optimum Mineral and Chemical Admixtures
Lee, Dongyule ; Ham, Suyun ; Oh, Taekeun ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 59~66
DOI : 10.14346/JKOSOS.2015.30.3.59
The undesirable effects of elevated external temperatures at placement on the properties of the fresh and hardened concrete are discussed briefly, and the possible use of the mineral admixtures to mitigate them and the association with water-reducing and retarding admixtures in terms of the mix design which are critical for minimizing slump loss and entrained air loss are examined in this study. To investigate the effects of such the mineral and chemical admixtures on the fresh and hardened properties of concrete exposed to high temperature, a series of concrete mixtures subjected to the high temperature were carried out and then fresh and hardened properties of the mixtures were analyzed and evaluated. Based on the results, new guide lines concerning the appropriate admixtures for hot weather are suggested.
Conceptional Framework of Level of Protection for Facilities
Kee, Jung Hun ; Lee, Hyun Seok ; Jamot, Dongfack Guepi Clovis ; Park, Jong Yil ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 67~72
DOI : 10.14346/JKOSOS.2015.30.3.67
Although attention to terrorism has increased sharply in recent years within many countries, it is by no means a new phenomenon. Majority of these countries have limited regulations or guidelines about terrorism. LOP (Level Of Protection) can be consider as a first step. This paper seeks to present a process to determine LOP and allowable damage. LOP is determined by asset value reason why it should be based on cost. The asset value is defined as "cost induced when asset is damaged". For example, the collateral damage outside the facility should be taken in consideration in the asset value. Allowable structural damage is assigned depending on LOP.
Improvement Direction on the Assignment of Safety Managers in the Construction Site
Kim, Ho Min ; Woo, In Sung ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 73~79
DOI : 10.14346/JKOSOS.2015.30.3.73
In consideration of current circumstances which management activities for safety performance on construction sites are mostly controlled by safety personnel, it is necessary to maintain qualified safety personnel those who are experienced and have adequate ability. This is a major factor in order to prevent any of work related incident in the construction site. However, the existing standard which enforces certain number of safety personnel in the construction site aligning with respective contract amount could lead to difficulties for proactive safety management. So, it is required to get improvement on the existing standard. In nominating the proper number of safety personnel, it would be more efficient to consider the level of risk for characteristic of work itself and the total number of manpower mobilized in respective construction work, rather than to follow the existing standard of manpower ratio as per the contract amount. Hence, this study aims to propose several plans which enable to improve the existing standard for assignment of safety personnel on construction sites.
A Study on the Improvement of Effectiveness of KOSHA 18001 in Construction Industry
Lee, Jin Seop ; Lee, Myeong Gu ; Lee, Dong Yul ; Oh, Tae Keun ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 80~84
DOI : 10.14346/JKOSOS.2015.30.3.80
The industrial accidents in the construction business have decreased on the basis of the accreditation of KOSHA 18001, one of the occupational health and safety management system. However, the interest and investment into the KOSHA 18001 has grown down because of the worsened construction business so that the construction companies that maintain the system as a mere formality has begun to be displayed. In this regard, this study performed the interview with the internal and external review board as well as the question investigation from the persons concerned in order to apprehend the current problems in the KOSHA 18001. First of all, the internal reviewers in the KOSHA are lack in the comparison with the number of new and renew accreditation. Secondly, many persons concerned with the KOSHA has required the quantitative criteria for the accreditation. Consequently, the manpower supplement associated with the external reviewers, the grading evaluation would be strong solutions to improve the effectiveness of KOSHA 18001.
The Effects of Employers' Breach of Safety Obligation and Violation of Psychological Contract on the Workers' Safety Behaviors and Turnover Intention
Hwang, Kyongin ; Moon, Kwangsu ; Oh, Shezeen ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 85~92
DOI : 10.14346/JKOSOS.2015.30.3.85
This study examined the effects of employers' breach of safety obligation and violation of psychological contract on the workers' safety behaviors and turnover intention. Especially, this study examined a mediating effect of violation of psychological contract on the relationship between employer's breach of safety obligation and workers' safety behavior and turnover. 198 workers were asked to respond to the questionnaires that measured various demographic variables, employers' breach of safety obligation, violation of psychological contract, safety behavior, turnover intention. A hierarchical regression was conducted to identify variables that had significant relationships between employers' breach of safety obligation and employees' safety behavior and turnover intention, and to examine the mediating effect of violation of psychological contract. Results indicated that the employers' breach of safety obligation significantly predicted both workers' safety behaviors and turnover intention. It was also found that the violation of psychological contract was a significant predictor for both workers' safety behavior and turnover intention. In addition, violation of psychological contract was found as mediating effect on the relationship between employers' breach of safety obligation and workers' safety behavior and turnover intention. Based on these results, the implications of this study and suggestions for future research were discussed.
A Work-related Musculoskeletal Disorder Risk Assessment Platform using Smart Sensor
Loh, Byoung Gook ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 93~99
DOI : 10.14346/JKOSOS.2015.30.3.93
Economic burden of work-related musculoskeletal disorder(WMDs) is increasing. Known causes of WMDs include improper posture, repetition, load, and temperature of workplace. Among them, improper postures play an important role. A smart sensor called SensorTag is employed to estimate the trunk postures including flexion-extension, lateral bend, and the trunk rotational speeds. Measuring gravitational acceleration vector in the smart sensor along the tri-orthogonal axes offers an orientation of the object with the smart sensor attached to. The smart sensor is light in weight and has small form factor, making it an ideal wearable sensor for body posture measurement. Measured data from the smart senor is wirelessly transferred for analysis to a smartphone which has enough computing power, data storage and internet-connectivity, removing need for additional hardware for data post-processing. Based on the estimated body postures, WMDs risks can be conviently gauged by using existing WMDs risk assesment methods such as OWAS, RULA, REBA, etc.
One-time Traversal Algorithm to Search Modules in a Fault Tree for the Risk Analysis of Safety-critical Systems
Jung, Woo Sik ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 100~106
DOI : 10.14346/JKOSOS.2015.30.3.100
A module or independent subtree is a part of a fault tree whose child gates or basic events are not repeated in the remaining part of the fault tree. Modules are necessarily employed in order to reduce the computational costs of fault tree quantification. This quantification generates fault tree solutions such as minimal cut sets, minimal path sets, or binary decision diagrams (BDDs), and then, calculates top event probability and importance measures. This paper presents a new linear time algorithm to detect modules of large fault trees. It is shown through benchmark tests that the new method proposed in this study can very quickly detect the modules of a huge fault tree. It is recommended that this method be implemented into fault tree solvers for efficient probabilistic safety assessment (PSA) of nuclear power plants.
Design for Strengthening Structural Integrity of the Reflective Metal Insulation in the Nuclear Power Plant
Lee, Sung Myung ; Eo, Min Hun ; Kim, Seung Hyun ; Jang, Kye Hwan ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 107~113
DOI : 10.14346/JKOSOS.2015.30.3.107
The goal of this paper is to investigate structural integrity factors of RMI(reflective metal insulation) to confirm the design requirements in nuclear power plant. Currently, a glass wool insulation is using now, but it will gradually be replaced with the reflective metal insulation maded by stainless steel plates. The main function of an insulation is to minimize a heat loss of vessel and pipes in RCS(reactor coolant system). It has to maintain structural a integrity in nuclear power plant life duration. In this study, the structural integrity analysis was carried out both multi-plate and outer shell plate by using a static analysis and experimental test. First, inner multi-plate has a self support structure for being air space. Because the effect of total static weight in multi-layer plate is low, a plate collapse possibility is not high. Considering optimum thin plate pressing process, it has to pre-check the basic physical properties. Second, the outer segment thickness and stiffener shape are verified by the numerical static analysis, and sample test for both type of panel and cylindrical pipe model.
A Study on the Verification Scheme for Electrical Circuit Analysis of Fire Hazard Analysis in Nuclear Power Plant
Yim, Hyuntae ; Oh, Seungjun ; Kim, Weekyong ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 114~122
DOI : 10.14346/JKOSOS.2015.30.3.114
In a fire hazard analysis (FHA) for nuclear power plant, various electrical circuit analyses are performed in the parts of fire loading analysis, fire modeling analysis, separation criteria analysis, associated circuit analysis, and multiple spurious operation analysis. Thus, electrical circuit analyses are very important areas so that reliability of the analysis results should be assured. This study is to establish essential electrical elements for each analysis for verification of the reliability of the electrical circuit analyses in the fire hazard analysis for nuclear power plants. Applying the results derived by the study to domestic nuclear power plants, it is expected to determine the adequacy of the fire hazard analysis report and contribute to the reliability of the fire hazard analysis of those plants.
Research about Researcher's Safety Ethnic Level and Improvement Extent of Safety Culture, Based on Organizational Safety Efforts
Lee, Su Kyung ; Park, Chang Bok ; Yoon, Yeo Song ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 123~134
DOI : 10.14346/JKOSOS.2015.30.3.123
This study was conducted with the following three study objectives. First, effects of safety awareness level of lab researchers to the improvement of safety culture in the organization Second, effects of organizational safety behaviors to the improvement of safety culture Third, test of mediating effects of organizational safety behaviors in the relationship between safety awareness level and the improvement of safety culture. The results show that organizational safety behavior is an indispensable factor for the improvement level of safety culture. Especially, the factors in safety training activities, safety compliance and management system are mediating variables which affect the safety awareness level and improvement level of safety culture, which shows these variables are very important factors in reducing safety accidents through the improvement of safety culture. Therefore, safety behaviors in the organization should be considered with priority. If the organization leads to improve safety awareness through regular safety training and rewards and punishes according to the test results, safety awareness could be improved. This study was conducted to identify the necessary factors to improve the overall safety culture in the organization and contribute to the diffusion of safety culture by improving the safety training awareness of the researchers.
A Study on the Revitalization of Disaster Vulnerable Population's Social Activity in the Safety Fields
Yoo, Byungtae ; Kim, Hyunjung ; Kim, Sangyong ; Oh, Keumho ;
Journal of the Korean Society of Safety , volume 30, issue 3, 2015, Pages 135~140
DOI : 10.14346/JKOSOS.2015.30.3.135
Individuals who are vulnerable during disaster - including elderly, people with disabilities, children, pregnant women and etc - have a strong desire to protect themselves when disaster strikes since they are less capable to deal with the impact of disaster. Their experience and effort to keep them safe can be used as a resource to reduce the impacts of disaster not only for them but also for the community as a whole. Therefore, voluntary disaster management program will contribute to our society as a tool to respond effectively to disaster not only to meet the vulnerable's special needs but also to enhance community safety and public interest. This paper suggests a model that able "disaster vulnerable population" to take a leadership role in identifying risk and vulnerability factors, recommending disaster management strategy, and through that, contributing to enhance society's disaster plan. Therefore, this study aimed to surveyed individuals including "disaster vulnerable population" in order to assess the vulnerable's participation in disaster related volunteer work and surveyed associated institutions(volunteer centers, community centers) in order to research currently existing relevant programmes and the participation of "disaster vulnerable population" in such programmes. Also conducted focus group interview to explore voluntary program which will possibly integrate "disaster vulnerable population" into disaster management activities. As a result, three types of voluntary disaster management programs - education, public-relations, and activity - were suggested.