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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Safety
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Journal DOI :
The Korean Society Safety
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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
Assessment of Risk in Wireless-Wired Network Based Control of Indoor Air Quality (IAQ) in Subway Stations
Choi, Gi Heung ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 1~6
DOI : 10.14346/JKOSOS.2014.29.1.001
With increasing number of citizen using subway stations everyday, safety, health and comfort of passengers and occupants became an important social issue. Considering the fact that various physical variables and pollutants are related to indoor air quality (IAQ) which may cause health problem, IAQ need to be closely monitored and controlled in multiple locations in subway stations. This study is a continuation of the previous studies and delay induced in wireless-wired network is experimentally evaluated and the risk involved is assessed. In doing that, a key parameter is identified to be the network delay in different network media. Application of information-theoretic measure to assess the risk in network delay is then discussed. The idea is based on the general principles of engineering design and their applications to quantification of uncertainty in network delay. Experimental results show that more risk is involved in wireless data communication. Efficient and fast conversion of transmission data in both LonWorks/IP server and ZL converter is also noted.
A Study on the Reliability Prediction and Lifetime of the Electrolytic Condenser for EMU Inverter
Han, Jae-Hyun ; Bae, Chang-Han ; Koo, Jeong-Seo ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 7~14
DOI : 10.14346/JKOSOS.2014.29.1.007
Inverter module, which feeds the converted power to the traction motor for EMU. Consists of the power semiconductors with their gate drive unit(GDU)s and the control computer for driving, voltage, current and speed controls. Electrolytic condenser, connected to the gate drive unit and a core component to drive the power semiconductor, has problems such as reduction in lifetime and malfunction caused by electrical and mechanical characteristic changes from heat generation during high speed switching for generation of stable power. In this study, To check the service life of electrolytic condenser, the test was carried out in two ways. First, In the case of accelerated life testing of condenser, the Arrhenius model is a way of life testing. Another way is to analyze the reliability of the failure data by the method of parametric data analysis. Eventually, life time by accelerated life test than a method of failure data analysis(Weibull distribution) was found to be slightly larger output.
A Study on the Prediction of the Effective Elastic Modulus of the Silicon Shock Programmer under Various Impact Velocities
Yang, T.H. ; Lee, Y.S. ; Kim, Y.J. ; Kim, T.H. ; Shu, C.W. ; Yang, M.S. ; An, C.H. ; Lee, G.S. ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 15~20
DOI : 10.14346/JKOSOS.2014.29.1.015
The silicon as the hyper-elastic material was used to design the shock programmer and dynamic characteristic of the shock programmer was studied. The shock programmer was a structure part that was mounted between the impactor and the test bed. The role of the shock programmer was to generate the acceleration time history by the objective of various impact tests. The effective elastic modulus of the silicon was varied under the velocity of the impactor. The effective elastic modulus of the silicon was estimated by the comparison with results between test and simulation.
A Study on the Characteristics of Smoke Release for Architectural Surface Materials and Architectural Adhesives
Park, Young Ju ; Kim, Won Jong ; Lee, Hae Pyeong ; Yu, Jae Yeol ; Yang, Young Suk ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 21~24
DOI : 10.14346/JKOSOS.2014.29.1.021
In this study, we have investigated the maximum smoke density and the initial stage smoke density in order to see the characteristics of smoke release of the architectural surface materials and the architectural adhesives, using smoke density chamber. As a result of the study, polyurethane foam showed the highest smoke density index, 206.55 within 10 min. In the case of the other samples, reinforced styrofoam was followed as 39.90, general styrofoam 33.73, and glass fiber 5.40, respectively. In the intial stage of a fire, it is forecasted actually to give hardship at the clear visibility. In the case of architectural adhesives, the highest ranking was those for windows and doors 509.64, stone 275.63, wood 232.25, tile 18.65, and styrofoam 6.44 were followed, respectively. This result is an early research to show characteristics of smoke release through experiment. However, it is meaningful that this study can be used as a basic for further study on architectural fire hazard prediction.
Numerical Analysis for the Deformation of a Mono Tendon Anchor Head
Park, Jang Ho ; Yang, Hyun Joo ; Cho, Jeong-Rae ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 25~30
DOI : 10.14346/JKOSOS.2014.29.1.025
This paper deals with a numerical study on the deformation of a mono tendon anchor head. The anchor head is used to introduce the compression to concrete, and consists of wedges and a head. All kinematics, material and contact nonlinearity are included in the precise analysis of a mono tendon anchor head. A numerical study on a mono tendon anchor head is performed to investigate effects of friction and eccentricity of load by ABAQUS. From the numerical results, it is verified that the deformation of a mono tendon anchor head is affected by characteristics of materials, boundary condition between wedge and anchor head, eccentricity of load, etc.
Comparative Study on Evaluating Low-Flow in Ungauged Watershed
Baek, Kyong Oh ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 31~36
DOI : 10.14346/JKOSOS.2014.29.1.031
In this study, the methodologies for evaluating the low-flow at the ungauged watershed are reviewed and assessed. The ungauged watershed can be classified into different situations such as the partially recorded watershed and the completely ungauged watershed. The extension method and the percentile method are used to evaluated the low-flow at the partially recorded watershed. The drainage-area ratio method and the regional regression method are used at the completely ungauged watershed. These four methods are applied and validated based on the hydrological and geometric data acquired from unit watersheds in Han River basin for TMDLs. In case of partially recorded watershed, the values of low-flow evaluated by the extension method are in better agreement with measured flow-rate rather than those by the percentile method. In case of completely ungauged watershed, the drainage-area method is broadly used to estimate the low-flow. It must be paid attention to consider the treated sewage discharge produced at watersheds when applying the method.
A Study on the Design Change of High-Risk Temporary Structures
Oh, T.K. ; Kim, Y.G. ; Lee, M.G. ; Paik, S.W. ; Woo, I.S. ; Song, C.G. ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 37~40
DOI : 10.14346/JKOSOS.2014.29.1.037
Article 29(3) of Occupational Safety And Health Act, which states a contractor can request a design change to an employer of businesses under the risk condition of construction of temporary structure, was established. Accordingly, in this study, recent fatal accidents caused by temporary structures were analyzed, and the level of inclusion of temporary structures in the design document were examined, and high risk temporary structures were classified. In addition, the requirements of design change of temporary structures were presented, and the qualifications of expert to certify the design change were proposed.
Ergonomics-based Design of 7 Degrees of Freedom Motion Capture Device
Loh, Byoung Gook ; Choi, Gi Heung ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 41~46
DOI : 10.14346/JKOSOS.2014.29.1.041
The design of a 7 degree of freedom motion capture device(MCD) has been presented. The newly designed MCD overcomes the shortcomings of the existing CADEN-7 exoskeleton robot by implementing various ergonomic design. To improve ease of operation, light-weight high-strength materials such as carbon pipes and engineering plastics were used to reduce weight of the MCD and arm-length adjustment mechanism was also added. The MCD showed consistent measurement results in designed experiments involving change of arm posture from nominal configuration to either elbow-side or arm-front configurations. Furthermore, captured motion in more natural tennis swing appeared to agree well with visual observations made.
An Experimental Evaluation on Human Error Hazards of Task using Digital Device
Oh, Yeon Ju ; Jang, Tong Il ; Lee, Yong Hee ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 47~53
DOI : 10.14346/JKOSOS.2014.29.1.047
The application of advanced Main Control Room(MCR) is accompanied with lots of changes and different forms and features through the virtue of new digital technologies. The characteristics of these digital technologies and devices give many opportunities to the interface management, and can be integrated into a compact single workstation in advanced MCR so that workers can operate the plant with minimum physical burden under any operation conditions. However, these devices may introduce new types of human errors and thus a means to evaluate and prevent such errors is needed, especially those related to characteristics of digital devices. This paper reviewed the new type of human error hazards of tasks based on digital devices and surveyed researches on physiological assessment related to human error. An experiment was performed to verify human error hazards by physiological responses such as EEG which was measured to evaluate the cognitive workload of operators. And also, the performances of four tasks which are representative in human error hazard tasks based on digital devices were compared. Response time,
power spectrum rate of each task by EEG, and mental workload by NASA-TLX were evaluated. In the results of the experiment, the rate of the
power was increased in the task 1 and task 4 which are searching and navigating task and memory task of hierarchical information, respectively. In case of the mental workload, in most of evaluation items, task 1 and 4 were highly rated comparatively. In this paper, human error hazards might be identified by highly cognitive workload. Conclusively, it was concluded that the predictive method which is utilized in this paper and an experimental verification can be used to ensure the safety when applying the digital devices in Nuclear Power Plants (NPPs).
Accident Models of Circular Intersections in Korea
Lee, Seung Ju ; Park, Min Kyu ; Park, Byung Ho ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 54~58
DOI : 10.14346/JKOSOS.2014.29.1.054
This study deals with the accidents of circular intersections in Korea. The goal is to develop the accident models for 94 circular intersections. In pursuing the above, this study gives particular attentions to collecting the data of geometric structure and accidents, and comparatively analyzing such the models as Poisson and NB regression and multiple regression model using SPSS 17.0 and LIMDEP 3.0. The main results are as follows. First, the negative binomial model among various models was analyzed to be the most appropriate. Second, 3 independent variables was adopted in the model, and these variables was analyzed to have a positive relation to the accident rate. Finally, the reduced width of circulatory roadway, removal of the parking lot within circulatory roadway and appropriate levels of approach lane were required to improve the safety of circular intersection.
A comparative Study for dispersion model in evacuation plan by using MAS-based evacuation simulation
Jang, Jae-Soon ; Rie, Dong-Ho ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 59~63
DOI : 10.14346/JKOSOS.2014.29.1.059
Smoke is one of the most critical factor when escaping from the fire since it reduces visibility and interrupts finding emergency exit lights. Therefore, it is recommended that an evacuation simulation program should incorporate the smoke factor. In addition, it is suggested that the program should include not only the unilateral damage by the smoke but also the detour evacuation by risk communication. In this study, MAS (Multi Agent System)-based simulation program which incorporates the reduced walking speed by smoke and adopts the dispersion evacuation logic during escaping from the fire. To make comparison, a commercial evacuation program, Pathfinder was used. It was found that the simulation results of MAS (Multi Agent System)-based program is better than Pathfinder in terms of safe evacuation. It means that evacuation simulation need a additional evaluation categories that include not only quick evacuation time but also safe evacuee number.
Development and the Application of Flood Disaster Risk Reduction Index
Moon, Seung-Rok ; Yang, Seung-Man ; Choi, Seon-Hwa ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 64~69
DOI : 10.14346/JKOSOS.2014.29.1.064
Community-based disaster preparedness approaches are increasingly important elements of vulnerability reduction and disaster strategies. They are associated with a policy trend that values the knowledge and capacities of local people. In this research, we describe the community diagnosis method and develop Flood Disaster Risk Reduction Index(FDRRI) for assessment of flood vulnerability. FDRRI is composed of four indicators such as Flood Exposure Indicator(FEI), Sensitivity Indicator(SI), Risk Reduction Indicator(RRI), and Community Preparedness Indicator(CPI). We anticipate to present the guideline for selection national preparedness projects and uplift community's preparedness capacity.
Design Proposal for Usability Enlargement of a household Fire Extinguisher
Kang, Byeong-Hwane ; Kim, Duek-Nam ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 70~79
DOI : 10.14346/JKOSOS.2014.29.1.070
This paper is on a new design of a household fire extinguisher with an increased initial responsiveness in case of fire. A public survey was taken prior to the new design and 133 faithfully answered surveys among the respondents were used as the research material. The survey was divided into the contents on the recognition of the fire extinguisher, the general requirements and improvement, and it was carried out to be classified on the basis of the results. Design summaries based on the results of surveys conducted are: First, the distance of fire distinguishing material to reach was made to be controlled for more responsiveness in terms of functionality. Second, the head of the fire extinguisher is in red and the spray button is in luminous paint to glow in the dark in terms of visibility. Third, it is made smaller and added a separate handle for bigger sized fire extinguishers in terms of mobility. Fourth, it is made in an aerosol type and has a friendly character on it in terms of approachability. Finally, colors of vivid tones, harmonious pastel tones or light greyish tones were used in terms of aesthetics. With the above study results applied to existing fire extinguisher design, it may contribute to reducing any fire damage.
A Study on Risk Perception and Policy Implication : A Psychometric Analysis of Korean Perception for Technological Risks
Chung, Ik Jae ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 80~85
DOI : 10.14346/JKOSOS.2014.29.1.080
A survey of risk perception in South Korea was conducted in 2007 to evaluate relative riskiness of typical industrial and technological risks. This article summarizes the characteristics of risk perception using psychometric analyses. The survey with a sample size of 1,194 reviews the perceived level of 25 risk items in the areas of transportation, chemicals, environment, industry, nuclear power generation, and newly-introduced risks. Six categories of risk identified by a factor analysis show that the level of perceived risk does not correspond to the statistical level. Psychometric analyses including voluntariness, severity, effect manifestation, exposure pattern, controllability, familiarity, benefit and necessity demonstrate that voluntary, familiar and immediate risks are perceived as less risky than involuntary, unfamiliar and delayed ones. Risk communication is critical in reducing the discrepance between objective and subjective level of risk. However, the amount of risk information does not always justify a successful risk communication. A safety policy, risk communication strategy in particular, should take into account diverse dimensions of risk reviewed by psychometric analyses in the study. Social policy toward safety can be improved by integrating policy, human, and social factors as well as technological advances.
A Study on Countermeasure Strategy on Risk of Human Errors driven by Advanced and Automated Systems Through Consideration of Related Theories
Shin, In Jae ;
Journal of the Korean Society of Safety , volume 29, issue 1, 2014, Pages 86~92
DOI : 10.14346/JKOSOS.2014.29.1.086
This paper provides an integrated view on human and system interaction in advanced and automated systems, which adopting computerized multi-functional artifacts and complicated organizations, such as nuclear power plants, chemical plants, steel and semi-conduct manufacturing system. As current systems have advanced with various automated equipments but human operators from various organizations are involved in the systems, system safety still remains uncertain. Especially, a human operator plays an important role at the time of critical conditions that can lead to catastrophic accidents. The knowledge on human error helps a risk manager as well as a designer to create and control a more credible system. Several human error theories were reviewed and adopted for forming the integrated perspective: gulf of execution and evaluation; risk homeostasis; the ironies of automation; trust in automation; design affordance; distributed cognition; situation awareness; and plan delegation theory. The integrated perspective embraces human error theories within three levels of human-system interactions such as affordance level, psychological logic level and trust level. This paper argued that risk management process should dealt with human errors by providing (1) reasoning improvement; (2) support to situation awareness of operators; and (3) continuous monitoring on harmonization of human system interaction. This approach may help people to understand risk of human-system interaction failure characteristics and their countermeasures.