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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
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Volume & Issues
Volume 26, Issue 6 - Dec 2011
Volume 26, Issue 5 - Oct 2011
Volume 26, Issue 4 - Aug 2011
Volume 26, Issue 3 - Jun 2011
Volume 26, Issue 2 - Apr 2011
Volume 26, Issue 1 - Feb 2011
Selecting the target year
Evaluation of Fatigue Endurance for an Ultra-light-weight Inline Skate Frame
Lee, Se-Yong ; Kim, Ho-Kyung ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 1~5
In order to evaluate fatigue endurance for an ultra-light weight inline skate frame, FEM analysis was performed. Tensile properties and a S-N curve were determined through tensile and fatigue tests on a modified Al-7075+
alloy. The yield and ultimate tensile strengths were 553.3 MPa and 705.5 MPa, respectively. The fatigue endurance limit of this alloy was 201.2 MPa. For evaluating the fatigue endurance of the inline skate frame, the S-N data were compared with the stress analysis results through FEM analysis of the frame. The maximum Von-Mises stress of the frame was determined 106 MPa through FEM analysis of the frame, assuming that the rider weight is 75 Kg. Conclusively, on the basis of fatigue limit, the inline skate frame has a safety factor of approximately 2.0.
Analysis of Failure Probabilities of Pipes in Nuclear Power Plants due to Stress Corrosion Cracking
Park, Jai-Hak ; Lee, Jae-Bong ; Choi, Young-Hwan ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 6~12
The failure probabilities of pipes in nuclear power plants due to stress corrosion are obtained using the P-PIE program, which is developed for evaluating failure probability of pipes based on the existing PRAISE program. Leak, big leak and LOCA(loss of coolant accident) probabilities are calculated as a function of operating time for several pipes in a domestic nuclear plant. The sensitivity analysis is also performed to find out the important parameters for the failure of pipes due to stress corrosion. The results show that the steady state oxygen concentration and steady state temperature are important parameters and failure probability is very low when the oxygen concentration is maintained according to the regulation.
Development of the Magnetic Abrasive Using Sr-Ferrite and GC
Yun, Yeo-Kwon ; Kim, Sang-Baek ; Kim, Hee-Nam ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 13~19
The magnetic polishing is the useful method to finish using magnetic power of magnet. That method is one of precision polishing techniques and has an aim of the clean technology using for the pure of gas and inside of the clean pipe. The magnetic abrasive polishing method is not so common for machine that it is not spreaded widely. There are rarely researcher in this field because of non-effectiveness of magnetic abrasive. Therefore, in this paper deals with development of the magnetic abrasive using Sr-Ferrite. In this development, abrasive grain GC used to resin bond fabricated low temperature. And Sr-Ferrite of magnetic abrasive powder fabricated that Sr-Ferrite was crused into 200 mesh. The XRD analysis result show that only GC abrasive and Sr-Ferrite crystal peaks detected which explains resin bond was not any more chemical reaction. From SEM analysis it is found that GC abrasive and Sr-Ferrite were strong bonding with each other by bond. The magnetic polishing is performed by polishing the surface of pipe by attracting magnetic abrasives with magnetic fields. This can be widely applied for finishing machinery fabrications such as various pipes and for other safety processes. In this paper, we could have investigated in to the changes of the movement of magnetic abrasive grain. In reference to this result, we could have made the experiment which is set under the condition of the magnetic flux density, polishing velocity according to the form of magnetic brush.
A Study on Heat-Flux Evaluation for Cable Fire Including Diagnostic Methodology for Degradation in Nuclear Power Plants
Lim, Hyuk-Soon ; Kim, Doo-Hyun ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 20~25
The fire event occurred in fire proof zone often causes serious electrical problems such as shorts, ground faults, or open circuits in nuclear power plants. These would be directed to the loss of safe shutdown capabilities performed by safety related systems and equipments. The fire event can treat the basic design principle that safety systems should keep their functions with redundancy and independency. In case of a multi-core cable fire, operators can not perform their mission properly and can misjudge the situation because of spurious operation, wrong indication or instrument. These would deteriorate the plant capabilities of safety shutdown and make disastrous conditions. In this paper, the characteristic of cable fire is investigated and the heat-flux evaluation for cable fire is studied. Moreover, a diagnostic methodology for degraded cable in nuclear power plants is presented.
A Study on the Safety Diagnosis for Electric Power Systems Using Thermal Imaging Analysis
Yu, Byeong-Yeol ; Kim, Chan-O ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 26~31
In this paper, the safety diagnosis using thermal image analysis is described for power equipments. The conventional three-phase comparison method has only provided the results of thermal comparison for the equipments. The proposed method defines the conditions of poor connection by visual checks, and supports the criteria with each thermal rise step. As a result, the thermal difference from
meant the warning state. In addition, the thermal difference more than
meant that the connection status was unbalanced. In this case, the countermeasure might be the internal load distribution. If the thermal difference more than
is observed, it means a hot spot at the poor connection. If the hot spot is observed all over the surface, its cause was the unbalanced load, which made the conductive parts discolored and raised the possibility of oxidization or
generation. This diagnostic technology employing thermal image analysis method can be directly applied in the field and ensures the safety of equipments.
Local Behaviour of Propagating Flames in an Explosion Chamber
Park, Dal-Jae ; Lee, Young-Soon ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 32~35
Experimental studies were carried out in an explosion chamber to investigate the influences of multiple cylinder obstacles on local flame propagation. The chamber dimension is 235 mm in height with a
rectangular cross section and a large vent area of
. Multiple cylinder bars with obstruction ratio of 30% were used. In order to examine the interaction between the propagating flames and the obstacles, temporally resolved flame front images were recorded by a high speed video camera. The propagation behaviour of local flame fronts around the left obstacle was analyzed in terms of two different methods such as the incremental burnt area divided by the flame front length and the average of the local propagation velocity determined at each point along the flame front. It was found that two methods give good consistency.
The Measurement and Investigation of Combustible Properties for n-Hexane
Ha, Dong-Myeong ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 36~41
For the safe handling of n-hexane, the explosion limit at
, the temperature dependence of the explosion limits and the lower flash point were investigated. And AITs(auto-ignition temperatures) by ignition delay time for n-hexane were experimented. By using the literatures data, the lower and upper explosion limits of n-hexane recommended 1.0 Vol% and 8.0 Vol%, respectively. In this study, the lower flash points of n-hexane recommended
. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for n-hexane, and the experimental AIT of n-hexane was
. The new equations for predicting the temperature dependence of the explosion limits of n-hexane is proposed. The values calculated by the proposed equations were a good agreement with the literature data.
Case on the Death of Scuba Diver by Analyzing the Air in Nitrox Cylinder
Lee, Joon-Bae ; You, Jae-Hoon ; Shon, Shung-Kun ; Sung, Tae-Myung ; Paeng, Ki-Jung ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 42~47
Going underwater is supposed to begin with the history of human beings. At first it was confined to relatively shallow level, less than several meters by holding breath. Recently, deep level diving has been necessary for such purpose as construction, maritime salvage, military operations, research and sports by using SCUBA(self-contained underwater breathing apparatus) equipment. As one goes down into water, the pressure on the diver is increased due to water pressure with depth, usually 1 atm for each 10 m water level. In deep water, mixed gas or nitrox(EAN, enriched air nitrox) could be applied for the divers lest they should get disease due to high pressure. Of these, the former is usually composed of oxygen and inert gas like helium or hydrogen, the latter contains higher oxygen content than that in normal air in which the oxygen concentration is designated by the character "EAN" followed by vol. % of oxygen, for example, "EAN 40" contains 40% of oxygen. In this case, a victim was found at the 39 m below the sea surface breathing air and nitrox in cylinder wrongly marked as EAN 36, which was analyzed to contain 63% of oxygen by GC/TCD. The cause of death could not be exactly related with the oxygen content in the nitrox cylinder, because the accurate depth for the victim to dive was not known, even though the victim was just found at the depth of 39 m. However, the wrongly marked nitrox could be believed to be the main cause of the death at the depth unless there happened any other accident except that during diving.
Evaluation of Structural Performance of Joint in Precast Prefabricated Manhole
Chung, Chul-Hun ; Song, Na-Young ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 48~61
In this study, static tests were done on the joints between precast manholes and the joints between manhole and sewer. The static loading tests in not only elastic range but also ultimate state of model members were carried out to investigate the bond strength and ultimate load of a joint of precast manholes. Specimens were tested in bending, horizontal shear, horizontal shear of circumferencial direction and direct tension. The results of tests indicated good structural performance of the joints between precast manholes and the joints between manhole and sewer.
Analysis Model for Predicting the Flexural Behavior of RC Beam Strengthened with FRP
Hong, Ki-Nam ; Lee, Bong-No ; Han, Sang-Hoon ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 62~69
This paper presents a new simple two-dimensional frame finite element able to accurately estimate the load-carrying capacity of reinforced concrete beams flexurally strengthened externally bonded fiber reinforced polymer (FRP) strips and plates. The proposed analysis model considers distributed plasticity with layer-discretization of the cross-sections and the bond-slip behavior of epoxy layer. The proposed model is used to predict the load-carrying capacity and the applied load-midspan deflection response of RC beams subjected to bending loading. Numerical simulations and experimental measurements are compared based on numerous tests available in the literature and published by different authors. The numerically simulated response agree remarkably well with the corresponding experimental results. Thus, the proposed model is suitable for efficient and accurate modeling and analysis of flexural strengthening of RC beams with externally bonded FRP sheets/plates and for practical use in design-oriented parametric studies.
Development of a Voluntary Hazard Assessment Model for Small- and Medium-Sized Ship-building Plants
Lim, Hyeon-Kyo ; Lee, Kyung-Tae ; Bae, Dong-Chul ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 70~76
Industrial accident frequency in small- and medium-sized ship-building plants is much higher than that of large-sized ones so that safety management activities should be different. In that sense, voluntary hazard assessment would be helpful for small- and medium-sized plants. However, conventional hazard assessment items and methods had some problems that discouraged voluntary participation of plants concerned. This study aimed to develop a new model for small- and medium-sized ship-building plants that can promote and encourage voluntary hazard assessment activities. For that purpose, ship-building process was assumed as a sequence of phases, and accident characteristics were compared with them. From that result, relative weights of accident factors including ship-building phases, accident types, occupational category, accident-induced objects, and hazardous items were determined with accident frequency data and with the help of expert groups. Therefore, for web-based integrative computer programming, a plain but accident data-dependent model was developed, with an additive function for related agencies that want to collect assessment results. It is expected that this model would help small- and medium-sized ship-building plants that wanted not only simple checklists but also effective assessment and management guidelines.
A Plan for Improving Shipbuilding Industry Foreman's Work Ability by Managing the Job Stress
Kim, Kwang-Jin ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 77~82
Recently, personal characteristics of organizational members arc regarded as an important factor that affects performance of organization. In addition, job stress is attributed to one of main factors that result in poor work ability and high turnover rate. In this study, job stress, work ability and DISC personality types were surveyed targeting 292 of foreman in shipbuilding company. The relationships between job stress and personal characteristics including personality types and correlation between job stress and work ability were analyzed based on the result of survey. As a result of statistical analysis, there were six statistically significant relationships between job stress and age, job tenure, work type, hobbies, exercise, personality types. On the other hand, there was a statistically significant relationship between work ability and exercise. Furthermore, negative correlation between job stress and work ability were found. In accordance with these analysis, this study presented how to improve work ability by managing job stress items and personal characteristics that affect the stress and the stress level.
Study on Risk Analysis of Debris Flow Occurrence Basin Using GIS
Jun, Kye-Won ; Oh, Chae-Yeon ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 83~88
Annually, many parts of the Korea have been damaged from the localized heavy rain and/or typhoons which peak between June and September, which result in extensive financial and human loss. Especially, because the most area of Gangwon province is composed of the steep slope mountains, the damages by the debris flow or land-sliding are more frequent and the frequency has been increased. To analyze the characteristics and causes of these debris flow disasters, lots of study are recently being conducted through database of weather, hydrologic, soil etc using a GIS or remote sensing. In this study, we applied GIS method to analyze the risk of the debris flow area. With the statistical analysis and infinite slope stability model(SINMAP), the debris flow risk level of the mountain slope was generated. As a result, the GIS statistical analysis showed high correlation that former model of SINMAP in determining the debris flow risk area.
Developing the Accident Injury Severity on a Field of Construction Work Using Ordered Probit Model
Hong, Ji-Yeon ; Kim, Kyung-Tae ; Lee, Soo-Beom ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 89~98
The traffic accidents at a construction site, which happen due to construction vehicles' frequent access to a construction site, its subsequent conflicts with ordinary vehicles and pedestrians, and inappropriate installation & management of traffic security facilities, have not many proportions in all traffic accidents, but obviously, the accident damage is quite serious when comparing the level of the fatal per one accident. This research conducted an analysis of traffic accident injury severity using Ordered Probit Model in relation to 241 traffic accident cases that occurred caused by construction sites among the traffic accidents that took place in Seoul and Gyeoggi-do region for two years from 2006 until 2007. As a result, the significant variables enough to explain traffic accident injury severity were analyzed to be the state of road surface, linear shape of an accident spot & whether the damaging car belongs to the vehicle for construction, and whether vehicles have access to a construction site at the time of an accident. Through this, this research found out some fact as follows: first, there need to be more aggressive management of the vehicles for construction and a year-round placement of the manpower who can control vehicular access to a construction site. Second, it is necessary to get drivers to recognize the fact that there exists a construction site on the construction section which is on the border of curved roads in advance to prevent a traffic accident, helping to reduce socioeconomic loss & costs incurred by a traffic accident.
A Study on the Re-establishment of Selection Criterion on the Frequency of Foggy Area in Highway
Jung, Sung-Hwa ; Lee, Soo-Beom ; Park, Jun-Tae ; Lee, Soo-Il ; Hong, Ji-Yeon ;
Journal of the Korean Society of Safety , volume 26, issue 2, 2011, Pages 99~106
There is a high potentiality of large traffic accident due to the dense fog when road is developed along the coast or river. The establishment of national level control system against the fog is necessary because the accident due to the creation of fog has a high fatality ratio than other weather conditions. The selection method for the frequent foggy area on highway was suggested to control the fog on the highway effectively because the establishment of the countermeasure against the fog in every range in highway is difficult practically. 44 ranges where the fog control is necessary throughout the year and the 45 ranges where the control is necessary in specific months were selected from the result of application of the weighted value on each visible distance data except the fog with beyond 250 m visible distance which does not affect on the safe driving out of the surveyedjsh fog visible distances. The preferential fog control countermeasure shall be provided to prevent the traffic accident and to reduce the severeness of the accident in case of fog creation for 89 ranges which were selected for frequent foggy area in highway.