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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 20, Issue 4 - Dec 2005
Volume 20, Issue 3 - Sep 2005
Volume 20, Issue 2 - Jun 2005
Volume 20, Issue 1 - Mar 2005
Selecting the target year
Contact Stress Analysis of Stick Type Ignition Coil Jacket PET
Kim Yang-Sul ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 1~6
Stick type ignition coil is new development that connect directly with ECU(Electronic control unit), without needing a spark plug cable and distributor. Glass-fiber reinforced ploymeric composites provide the desirable properties of high stiffness and strength as well as low specific weight. Stick type ignition coil jacket is using PBT CF30 resin. PBT CF30 resin is a kind of electric insulation which is a superior engineering plastic that is used to prevent the leakage of the electrical current. If PET receive a mistake of design or excessive force when HV terminal oppress on jacket, it can happen to crack. Local stress concentrations occurring on the contact surface, the contact phenomenon becomes a direct cause to the wear and failure of mechanical structures. When it is cracked, it can allow a leakage of the electrical current. So, in this study, we analyze the contact stress to PBT jacket using ANSYS program, when HV terminal oppress on jacket. We suppose PBT to be Jacket and we analyzed contact stress that happens in PET like PBT analysis method. We compared the use of PBT and PET.
Safety Evaluation for Restoration Process on Plastic Deformed Cylindrical Beam
Park Chi-Yong ; Boo Myung-hwan ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 7~12
In heavy industrial fields such as power plant and chemical plant, it is often necessary to restore a damaged part of large machinery or structure which is installed in the hazard working place. In this paper, to evaluate the safety of plastic deformed cylindrical beam a finite element technique has been used. The variations of residual stresses on the process of damaging and restoring for surfaces and cross-sections have been examined. The results show that the maximum von Mises stresses occur outer cylinder surfaces of boundary between cylindrical beam support md cylindrical beam when deformation procedure and restoring force is applied. The maximum residual stress remains 158.6MPa in the inner wall and this value correspond to
of yield stress then restoration procedure is finished.
A Study on Prediction and Evaluation of Noise and Vibration Using GIS
Kim Tae-gu ; Yoon Hee Kyung ; Lee Sang Hyun ; Park Min Soo ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 13~17
This paper presents an information system of noise and vibration caused by people as a major source of the environmental problem in residential areas with which people are dissatisfied. Therefore, it is important to monitor the influence of noise and vibration in residential areas. Generally, Geographical Information Systems (GIS) play an important role in noise and vibration mapping. The purpose of this paper is to investigate noise and vibration effects in an urban area and develop a new information network in GIS. Noise and vibration measurements were carried out at a road randomly chosen near INJE University. The obtained values are graphically represented with GIS. Therefore, it is possible to predict noise and vibration in GIS when establishing effective urban plans.
A Study on the friction and Wear Characteristics of C-N Coated SCM415 Steel
Lyu Sung-ki ; Lu Long ; Jin Tai-yu ; Lian Zhe-Man ; Cao Xing-Jin ; Cho Sung-Min ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 18~23
This study deals with the friction and wear characteristics of C-N coated SCM415 steel. The PSII(plasma source ion implantation) apparatus was built and a SCM415 test piece with steel substrate was treated with carbon nitrogen by this apparatus. The composition and structure of the surface layer were analyzed and compared with that of PVD(physical vapor decomposition) coated TiN layer. It was found that both of friction coefficient of C-N coating and TiN coating decreased with increasing load, however, C-N coating showed relatively lower faction coefficient than that of TiN coating. The micro-vickers hardness of C-N film is 3200 Hv, which is
higher than that of TiN film. The critical load of C-N film is 52N, which is
higher than that of TiN film. The hardness of C-N film fabricated by Plasma ion implantation is
higher than that of base material, and faction coefficient is
lower than that of base material. It is also interesting to note that the friction was changed from adhesive wear mode to light oxidizing wear mode.
A Study for a Effectiveness of Smoke Control Operation Mode for a Subway with Separate Platform
Rie Dong-Ho ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 24~29
This study aim to derive the operation method of a comprehensive ventilation system which is capable of providing passengers with safe exit paths from platforms in onboard The situations. The airflow distributions in subway platforms under 13 types of tunnel vent system for a double track stop condition was calculated and having analyzed diffusion behaviors of smoke and heat exhaust in such states by performing 13 kinds of different ventilation scenarios by using a 3-D Fire Dynamic Simulation (FDS) simulation model to clarify the safety evaluation for the heat and smoke exhaust on subway fire events.
Construction of Through Transmission Scanning System for Weld Defects Detection of Rail Weld Zone
Yun, In-Sik ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 30~35
This study proposes construction of through transmission for weld defects detection of rail weld zone from ultrasonic signals. For these purposes, the ultrasonic signals for defects(porosity and crack) of weld zone in rails are acquired in the type of time series data and echo strength. 6 lines in the distance amplitude characteristics curve(DACC) indicated damage evaluation standard of weld zone in rails. The acquired ultrasonic signals agree flirty well with the mesured results of reference block and sensitivity block(defect location beam propagation distance, echo strength, etc). The proposed construction of through transmission in this study can be used for weld defects detection of rail weld zone.
The Effect of In-Outlet Differential Pressure on a Valve Body Stress and Deformation by the Blow-by Gas Flow Characteristic in the PCV valve for Automobile
Kwon Oh-Heon ; Lee Yeon-Won ; Song Sang-Min ; Lee Jong-Hoon ; Kang Ji-Woong ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 36~41
PCV(Positive Crankcase Ventilation) valve acts as a flow control valve to get a re-combustion of blow-by gas by having it flow from a crankcase to an inlet manifold suction tube. The blow-by gas of the crankcase should be eliminated or taken properly because it cause corrosion to critical parts, and contributes to increase crankcase pressure that can cause a drop in efficiency. The excessive stress and strain on the PCV valve that remove these harmful gas would be bring the difficult on the flow rate control and failure of the valve. Those condition inevitably induce the accident. Therefore, this study purpose is FEM evaluation of the stresses and deformation in the X3 PCV model according to the change of the differential pressure between inlet and outlet. From results, the maximum equivalent stresses increased linearly according to the increase of the differential pressure at the about 50mm from the inlet position and were under the yield strength of the valve. And the deformations were relatively small regardless of the in-outlet differential pressure variation.
An Experimental Study on the Effect of the Balcony on the Vertical Smoke Movement of the High Rise Building
Yang Seung-Shin ; Kim Sung-Chan ; Ryou Hong-Sun ; Shim Sang-Hoon ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 42~48
The present study investigates the effect of balcony on external smoke movement of high rise building through the fire tests of the 1/10 reduced model scale using Froude scaling. A hexane pool fire is used to examine the smoke movement for various opening sizes of balcony and temperature distributions are measured by T-type thermocouples. Also, hydrogen bubble technique is applied to visualize the smoke movement near the balcony. Measured temperatures of the closed balcony is 2.5 times higher than those of the open balcony because the external smoke in case of the closed balcony rise along the vertical wall. The maximum vertical temperature of partially closed balcony is similar with fully closed balcony and mean temperature inside of balcony increases as opening size of balcony decreases. The experimental results show that the balcony space plays an important roles in preventing fire propagation and cooling of smoke layer. In order to ensure the fire safety in high rise building design, a series of systematic researches are required to examine the various type of balconies.
The Evaluation of Interlaminar Fracture Toughness and AE Characteristics in a Plain Woven CFRP Composite with DCB Specimen
Yun Yu-Seong ; Kwon Oh-Heon ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 49~54
Recently, many kinds of advanced composite materials have been used in various industry fields. Among them, fabric CFRP composites are being used as primary structural components in many applications because of their superior properties. However, the complexity of the fabric structure makes understanding of their failure behavior very difficult. The mechanical strength and crack propagation of plain woven carbon fiber fabric laminate composites are examined by acoustic emission(AE) method. AE signals are acquired during the tensile test and fracture tests. Thus, the relationship between AE signal and mechanical behavior curves and crack extension length are shown. Also the interlaminar fracture toughness in terms of AE characteristics are discussed in viewpoint of crack propagation behavior.
Effect of Circumferential Location of Local Well Thinning Defect on the Collapse Moment of Elbow
Kim Jin-Weon ; Lee Jang-Gon ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 55~61
The purpose of this study is to investigate the effect of circumferential location of local wall thinning defect on the collapse behavior of an elbow. Thus, the present study conducts three-dimensional finite element analysis on the 90-degree elbow containing a local wall thinning at intrados, crown and extrados of bend region and evaluates the collapse moment of wall thinned elbow under various thinning shapes and loading conditions. Combined internal pressure and bending moment are considered as an applied load. The internal pressure of
and both closing and opening mode bending are employed. The results of analysis show that the reduction in collapse moment of the elbow by local wall thinning is more significant for a defect locating at crown than for a defect locating at intrados or at extrados. Also, the effect of internal pressure on the collapse moment of wall thinned elbow depends on the circumferential location of thinning defect and applied bending mode.
Extended Compliance Solution of ESET Specimen for Thermal fatigue Crack Growth Test
Lee, Ho-Jin ; Kim, Maan-Won ; Lee, Bong-Sang ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 62~67
An eccentrically-loaded single edge crack tension specimen (ESET) is similar to a compact tension(CT) specimen loaded in tension-tension. The standard ESET specimen exhibits advantages over other types of cracked specimen, such as n, single-edge crack, and middle-crack tension specimen. The details of ESET specimen configuration, test procedure, and calculations are described in ASTM E647 standard. However, a difficulty in attaching COD gage to the knife-edge on the front foe of the specimen can be found when the size of ESET specimen is small for rapid cooling and heating in thermal fatigue testing. The finite element analysis is performed for the ESET specimen with projected knife-edge on the front foe and a crack-length-compliance equation is suggested for the new specimen configuration. Calibration test are conducted with 347 stainless steel to compare the measured crack length with the calculated crack length from the suggested compliance expression. The test results showed good agreements with those of analysis.
The Evaporation Shape of Deposited Droplet on the Hot Surface
Bang Chang-Hoon ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 68~74
The objective of the present work is to examine the evaporation shape of deposited droplet on the hot surface. this paper performed the experiments as following conditions: (a) the surface temperature is within the range between
in the conduction and radiation, (b) droplet diameter is 3.0mm. The results are as follows; while droplet evaporates, droplet's radius is kept changelessly to
evaporation time and droplet's shape is kept changelessly after. In case use Constant radius model, about
is appearing high than value that time-averaged heat flux applies Inverse heat conduction.
The Effects of Temperature Change on the Residual Bending Strength of CFRP Laminates after Impact
Ra Seung-woo ; Jung Jong-an ; Yang In-young ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 75~80
In this paper, when CF/EPOXY laminates for high efficiency space structure are subjected to FOD(Foreign Object Damage), the effects of temperature change on the impact damages(inter laminar separation and transverse crack) of CF/EPOXY laminates and the relationship between residual life and impact damages ale experimentally investigated. Composite laminates used in this experiment are CF/EPOXY orthotropic laminated plates, which have two-interfaces
. CF/EPOXY specimens with impact damages caused by a steel ball launched from the air gun were observed by the scanning acoustic microscope under room and high temperatures. In this experimental results, various relations were experimentally observed including the delamination area vs. temperature change, the bending strength vs. impact energy and the residual bending strength vs. impact damage of CF/EPOXY laminates. And as the temperature of CF/PEEK laminates increases, the delaminaion areas of impact-induced damages decrease linearly. A linear relationship between the impact energy and the delamination areas were observed. As the temperature of CF/PEEK laminates increases, the delamination areas decrease because of higher initial delaminatin damage energy.
Detection of Radiation Degradation of LDPE by ESR Spectroscopy
Kim Ki-Yup ; Lee Chung ; Ryu Boo-Hyung ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 81~86
This study has investigated radiation degradation of low density polyethylene(LDPE). Samples were irradiated up to 800kGy using a
at a dose rate of 5kGy/hr in the presence of air atmosphere at room temperature. After irradiation, storing for 2 weeks, free radical measurement of LDPE has established by electron spin resonance(ESR). ESR measurement showed that free radical concentration(FRC) was increased with radiation dose and decreased with the time. The radical types showed alkyl, allyl, and peroxy radical with the irradiation, these changed to peroxy radical with the time.
The Properties of Waveform and Plug Formed by Poor Contact of Power Cord Sets
Choi Chung-Seog ; Kim Hyang-Kon ; Kim Dong-Ook ; Kim Young-Seok ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 87~93
In this paper, we analyzed ignition characteristics of combustible material and the waveform of power dissipation, voltage and current by poor contact. And the surface structure of plug by poor contact was analyzed. In the results of experiment, the heat generated by poor contact and ignited the combustible material on power cord sets. The insulation material was molten and carbonized by the heat conduction though plug pit and voids were formed inside of insulation material. The waveform of voltage and power dissipation distorted because of a growth of oxidation by poor contact. In particular, in case that load was big load, the waveform of voltage and power dissipation severely distorted as with the passage of time. The surface of plug pin was changed from erosion mark to welding mark according to big load. The results will be applied to the cause analysis of electrical disaster.
A Study on Polymer Surface Treatment Using Plasma
Park Hee-Lyun ; Lim Jong-Min ; Seul Soo-Duk ; Lee Woo-Nae ; Moon Jin-bok ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 94~100
The plasma, ionized gas state, is generally composed as the 4th state in the universe. Generating the plasma artificially has been studied by spending energy and it has been applied so much in human's life. There are several merits to modify the surface of polymer using plasma. Above all, plasma maintains the properties of polymer itself, but changes the properly of polymer surface only. Also, it is the environmentally fraternized because there are no waste processing from organic solvent. Furthermore, it is possible that continuous automated-processing in case of high-pressure plasma. Therefore, we have tried the reforming of surface to rise the adhesive strength between the material of polymer, and have experimented rising the adhesive strength through peel strength by virtue of processing time and using gas, of course, confirmed the change of polymer surface through measuring the contact angle analysis and scanning electron microscopy(SEM).
Dynamic Analysis of Tunnel Structures Considering Soil-Structure Interaction
Kim, Hyon-Jung ; Park, Jang-Ho ; Shin, Yung-Seok ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 101~106
When a underground structure is constructed at the site composed of soft soil, the behavior of a underground structure Is much affected by the motion of soft soil. Therefore, the effect of soil-structure interaction is an important consideration in the design of a underground structure such as tunnel at the site composed of soft soil. This paper presents the results of the study on dynamic response of tunnel structures and soil-structure interaction effects. The computer program SASSI was used in seismic analysis of tunnel structures because it is more capable of analyzing dynamic response or structures considering soil-structure interaction. As regards the results, the flexibility of surrounding soil affects dynamic response characteristics of tunnel structures and response of tunnel structures can be amplified.
Accident of Foreign Worker's at Construction Sites
Son Ki-Sang ; Yang Hak-Soo ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 107~112
The purpose of this study is to propose and introduce Accidents Prevention Remedies(APRs) and their priorities especially for Accident Causing factors(ACFs) drawn by surveying and analyzing how much foreign workers in Korea have been exposed to dangers at a construction site. At frist as a result of the analysis of the questionnaire which 59 foreign industrial trainees working at the construction sites in Seoul-Kyunggi area had responsed, 12 ACFs and 11 APRs were put out by using the SPSS programme. Then, through the Analytic Hierarchy Process(AHP) about the questionnaire from 96 safety and civil engineers who have experienced in managing foreign labor at the construction sites all over the country, the APRs given their priorities of relative importances are as follows; First, it is absolutely necessary that every working order to foreign workers should be made more definitely in accordance with a concrete process schedule. Second, the owners should increase investments in improving foreign workers' welfare in order to minimize their potential human error. Third, Korean language education programme for simple technical terms should be made and executed at least.
The Benefit Cost Analysis of the Accident Prevention Cost in Construction Work
Park Jong-Keun ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 113~118
This study delivers the actual condition of investment for industrial accident prevention based on survey of 500 construction sites from 'reports far industry safety and health' published by Korea Occupational Safety & Health Agency (KOSHA). The various research techniques were used such as technical statistic analysis for construction industry, cost comparison of industrial accident prevention and accident loss. A formula was deduced to calculate accident loss and accident frequency by accident prevention cost through regression analysis.
The Risk Assessment of Work Type in Reinforced Concrete Construction Work
Lee Jong-Bin ; Go Seong-Seok ; Jang Seong-rok ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 119~125
Construction work accidents have not decreased in spite of much effect such as new work methods education and research related to the safety management. Specially, many fatal accidents were mainly caused by unanticipated risk factors in reinforced concrete construction work, which was involved in apartment, building. school church, hotel hospital, bank work and the other works. According to the construction fatal accident book by KOSHA 1,903 workers were killed by the fatal accidents in reinforced concrete construction work during the 13 years
. From these reasons, this study researched the cause of fatal accidents which were happened in reinforced concrete construction work during last 13 years and surveyed construction managers and specialists about risk factors according to the work type in the reinforced concrete construction work. Therefore, this study will suggest the counterplan about the construction safety management and prevent fatal accidents from construction site related to the reinforced concrete construction work.
Fuzzy Linguistic Approach for Evaluating Task Complexity in Nuclear Power Plant
Jung Kwang-Tae ; Jung Won-dea ; Park Jin-Kyun ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 126~132
The purpose of this study is to propose a method to evaluate task complexity using CIFs(Complexity Influencing Factors). We developed a method that CIFs can be used in the evaluation of task complexity using fuzzy linguistic approach. That is, a fuzzy linguistic multi-criteria method to assess task complexity in a specific task situation was proposed. The CIFs luting was assessed in linguistic terms, which are described by fuzzy numbers with triangular and trapezoidal membership function. A fuzzy weighted average algorithm, based on the extension principle, was employed to aggregate these fuzzy numbers. Finally, the method was validated by experimental approach. In the result, it was validated that TCIM(Tink Complexity Index Method) is an efficient method to evaluate task complexity because the correlation coefficient between task performance time and TCI(Task Complexity Index) was 0.699.
Slip Distance of Forklift Depending upon floor Materials and Conditions of Worksite
Kee, Do-Hyung ; Sin, Dong-Hun ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 133~136
The accidents attributed to the forklift have increased as the number of the forklift increases. It is significant that most of the accidents were fatal. This study investigated slip distance of forklift depending upon the floor materials and their conditions in industrial site. For doing this, an experiment was conducted, in which the floor materials and their conditions were adopted as independent variables and the slip distance as dependent variable. Six floor materials included asphalt concrete, two color hardener mortar, epoxy paint and deluxe tile. Two types of floor conditions, wet and dry, were used in the experiment. The results showed that the slip distance was shorter on the asphalt and concrete floors than on other floors, and that the distance on the wet floor was six times longer than that on the dry condition. Based on this result, it is recommended that as in the advanced countries, the regulation or standard on the floor conditions such as friction coefficient be established for reducing forklift relevant accidents.
Status of Fatal Crane Accidents and Their Safety Measures
Kee, Do-Hyung ; Kim, Won-Ki ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 137~142
This study aims to survey the fatal industrial accidents attributed to crane, and to present their preventive measures based on the results of the survey. The survey was on the basis of 60 fatal accidents caused by crane from January 1998 to July 2003. The results showed that 1) of varying types of crane, fatal accidents were most frequently caused by mobile no: 2) more crane accidents occurred on weekend of Friday and Saturday by a day of the week; 3) experienced crane operators with long length of work or the age of over 40 were more frequently subjected to fatal accidents compared to novice operators; and 4) crane accidents were more attributable to unsafe acts such as poor working method, non-observance for safe working rules, etc. than hardware aspects of crane itself. It is recommended that for reducing crane accidents, more practical education and training for crane operation be reinforced.
Promoting Effectiveness of Occupational Health and Safely Education Program
Kang, Jong-Cheol ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 143~147
Immediate responsibilities for occupational health and safety (OHS) management reside in business proprietors and supervisors whose voluntary participation in OHS educational programs, not legal sanctions, may thus lead to safe and pleasant work environments. This study investigates how to promote the effectiveness of OHS educational programs to draw voluntary participations in such programs in Korea To this end, drawbacks of current practices in OHS education are first analyzed, and then OHS related policies in advanced countries in the area of disaster prevention such as United States and Germany, are also scrutinized. Based on the preliminary investigations, the following propositions are made to lay out the foundation for promoting effective OHS educational programs in Korea: improvement of government regulations, revitalizing job training initiatives, on-site OHS education, compensation and incentive programs for OHS education. These propositions may also facilitate the deployment of disaster prevention activities across the organization and prevent various occupational disorders (for example, musculoskeletal disorders). This study emphasizes that monolithic OHS education systems led by regulatory agencies may not be efficient to ensure healthy and safe work environments. Globally competitive OHS educational systems may be established only when they are based on the health and safety requirements specified by proprietors and workers.
Ergonomic Evaluation and Improvement of the Manufacturing Lines of Compressors
Bae, Dong-Cheol ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 148~152
The purpose of this paper is to investigate risk factors and ergonomically improve the manufacturing lines of compressors for prevention of work-related musculoskeletal disorders, enhancement of productivity, and workers satisfaction We executed questionnaire survey, ergonomic risk factors investigation of manufacturing lines and ergonomic intervention of work methods, workplace and hand tools. The results of the questionnaire showed that
of respondents were positive in WMSDs symptom survey. In ergonomic evaluation, the analysis methods such as RULA and NIOSH lifting equation were used and 28 processes in the lines were evaluated to be potentially hazardous. We ergonomically improved the processes to reduce potential WMSDs hazards : manual material handling, carts, work tables, transport methods, working posture and hand tools.
Cause Analysis and Prevention of fishing Vessels Accident
Lee, Hyong-Ki ; Chang, Seong-Rok ;
Journal of the Korean Society of Safety , volume 20, issue 1, 2005, Pages 153~157
The injury accidents in fishing vessels account for
of all marine injury casualties
and is on an increasing trend every year. Also, it is remarkable for the injury accidents to be basically caused by human errors. This study aims to investigate the human error of injury accidents in fishing vessels and presents the injury preventing program in them. Human errors were analysed by the methods such as SHELL & Reason Hybrid Model, GEMS Model adopted by International Maritime Organization(IMO). Based on the analysis, the following propositions were made to reduce the fishing vessels accidents by human errors : improvement of hazard awareness and quality of personnel, establishment of safety management system, and enforcement of vessels inspection.