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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
Editor in Chief :
Volume & Issues
Volume 27, Issue 6 - Dec 2012
Volume 27, Issue 5 - Oct 2012
Volume 27, Issue 4 - Aug 2012
Volume 27, Issue 3 - Jun 2012
Volume 27, Issue 2 - Apr 2012
Volume 27, Issue 1 - Feb 2012
Selecting the target year
Cost-benefit Analysis in Certification of Devices and Equipments Used in Farm Work
Choi, Gi Heung ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 1~6
This study focuses on the benefit-cost analysis of certification of more than eight hundred devices and equipments used primarily in farm work. Specifically, EPA-suggested averting behavior approach was used for the analysis. Cost-benefit analysis indicates that there will be a net cost of 30 billion won for the first year since the introduction of the certification system. It is expected, however, that net benefit of 568 billion won after 11 years and the accumulated net benefit will reach to 3,867 billion won. These results validate the introduction of safety certification systems for devices and equipments used in farm work sites.
Evaluation of the Joint Strength of Lead-free Solder Ball Joints at High Strain Rates
Joo, Se-Min ; Kim, Taek-Young ; Lim, Woong ; Kim, Ho-Kyung ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 7~13
A lack of study on the dynamic tensile strengths of Sn-based solder joints at high strain rates was the motivation for the present study. A modified miniature Charpy impact testing machine instrumented with an impact sensor was built to quantitatively evaluate the dynamic impact strength of a solder joint under tensile impact loading. This study evaluated the tensile strength of lead-free solder ball joints at strain rates from
. The maximum tensile strength of the solder ball joint decreases as the load speed increases in the testing range. This tensile strength represented that of the interface because of the interfacial fracture site. The tensile strengths of solder joints between Sn-3.0Ag-0.5Cu and copper substrate were between 21.7 MPa and 8.6 MPa in the high strain range.
First Wall Design of ITER Test Blanket Module(TBM) based on RCC-MR Code
Shin, Kyu In ; Lee, Dong Won ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 14~19
The Helium cooled ceramic reflector(HCCR) test blanket module(TBM) has been designed and developed to participate the ITER(International Thermonuclear Experimental Reactor) test blanket program in Korea. The TBM was one of the main objectives for developing ITER for proving the tritium self-sufficiency and the heat transfers to produce the electricity with the breeding blanket concept. Among the TBM components, the first wall(FW) was the most important component in safety since it was directly faced a high level of a heat and fast neutrons from the plasma side and could protect the others components inside TBM. In this paper, the FW has been designed through the thermo-mechanical analysis considering ITER operation conditions. With the developed simple models, the stress limit analysis based on RCC-MR code which is the nuclear power plant design codes in France was evaluated for the allowable design criteria. The results showed that the designed FW model satisfied
of the allowable stress(
) in RCC-MR code at the maximum stress region in the FW.
The Static Collapse Characteristics of CFRP Single and Double Hat Shaped Section Members according to the Interface Number for Lightweight
Hwang, Woo-Chae ; Cha, Cheon-Seok ; Yang, In-Young ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 20~25
Currently, the most important purpose in designing automobile is environment-friendly and safety performance aspect. CFRP(Carbon Fiber Reinforced Plastics) of the advanced composite materials as structure materials for vehicles, has a wide application in lightweight structural materials of air planes, ships and automobiles because of high strength and stiffness. In this study, experimental investigations are carried out for CFRP single and double hat shaped section member in order to study the effect of various stacking condition. They were cured by heating to the appropriate curing temperature(
) by means of a heater at the vacuum bag of the autoclave. The stacking conditions were selected to investigate the effect of the interface numbers. The CFRP single and double hat shaped section members which manufactured from unidirectional prepreg sheets were made of 8ply. The static collapse tests performed and the collapse mode and energy absorption capability were analyzed according to interface number.
Analysis of the Junction Temperature in the LED Chips using the Finite Element Method
Han, Ji-Won ; Park, Joo-Hun ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 26~30
It is difficult to determine the junction temperature because LED lightings are manufactured using several chips with low power. This paper reports on the finite element method of the determination of junction temperature in the GaN-based LEDs. The calculated junction temperature of the LED chip using FEM was compared with the experimentally measured data. As the results of this study, the junction temperature of LED chips with via holes is lower than that of LED chips without via hole. Therefore, the research of via hole is necessary to decrease junction temperature of LED chips.
An Analysis about Consumed Energy of Electric Multiple Unit Used TCMS Data on the Condition of Safety Driving
Kim, Kyujoong ; Lee, Keunoh ; An, Sukwan ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 31~42
Urban transit vehicle that uses electrical energy, is faster, safer and energy-efficient public transit than other means. As a Research method, the Matlab/Simulink are used to modeling a regenerative brake-capable train, and actual parameters such as powering and braking characteristics, all kinds of resistance, passenger load, velocity, gradient, radius of curve etc and powering and breaking commands per time or distance are inputted to train's dynamic equation, then a simulation program is made and used to yield train driving pattern and driving time and the amount of driving energy used thereby at auto and manual operation and at all sector.
A Study on the Unbalanced Current Distribution of HTS Power Cable
Kim, Jae-Ho ; Park, Chung-Hwa ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 43~47
The unbalance currents flow the High Temperature Superconducting (HTS) power cable caused by asymmetrical fault, harmonic distortion and unbalanced load. That problem causes additional loss and leakage field in the HTS power cable, and deteriorates the electric power quality and stability. In addition, large amounts of unbalanced current can cause negative sequence and ground relays to operate. This paper presents an analysis unbalanced three-phase current distribution in HTS power cable caused by unbalanced load condition and grounding methods using PSCAD/EMTDC. The results obtained through the analysis would provide important data for the design of HTS power cables and valid information for their installation in power system.
Development of Electric Instrument of Current and Leakage Current based on NI-9223 and Current Prove
Kim, Sung-Chul ; Kim, Un-Sul ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 48~53
This paper is purposed to develop portable electric instrument to select NI-9223(National instrument comp.) and clamp meter(HIOKI comp.), which can be used in developing electric instrument, to detect leakage current(ZCT) and current(CT) signals. In this paper, The electric instrument that can interface with current and leakage current instrument(HIOKI 9283), is developed by NI-9223 of NI comp.. HIOKI clamp meter can measure current signals certainly by high-sensitivity of 10
resolution(leakage current : at 10 mA range) and current 1~200A range. The NI-9223 use four 16-bit analog-to-digital converters(ADCs) for true simultaneous sampling at up to 1 MS/s per channel. NI-9223 can synchronize all analog input modules installed in the same chassis to share the same start clock and/or sample clocks. The monitoring program is developed by SignalExpress of LabVIEW. The monitoring program are developed to analyze at simultaneous sampling on electrical signals such as leakage current(ZCT) and current(CT). The developed system verification tests were conducted, and portable electric instrument can be used in place which requires analysis of the actual electrical signal.
Analysis of Characteristic for Electric Leakage Component at Stable Size
Kim, Sung-Chul ; Kim, Doo-Hyun ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 54~58
This paper is purposed to analyze electric leakage component which can prevent electrical fires on breaker capacity expansion and power failure by operation of ELB(Earth leakage breaker) for stable sizes. In order to analysis for electric leakage component for stable sizes, this paper studied field state investigation which are at stable companies( 10 companies) in cheong-won location to deduce the problems of electric leakage component is analyzed. The field state experiment method is measured with electric leakage component which load part of ELB detected by electric loads(electrical fan, lighting, auto waterer, feeder and halogen lighting) and stable sizes. Results show that electric leakage component suggested in this paper are valuable and usable to electrical fire in leakage current based on environment factor, which will prevent severe damage to human beings and properties and reduce the electrical fires in stable.
Extinguishing Characteristics of Zeolite adsorbed Dry Chemical Powder
Shin, Changsub ; Park, Hojun ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 59~63
The use of dry chemical powder has been increased as it can be stored for a long period and sustain in stable condition compared to gas or liquid phase extinguishing agents. A new type of dry chemical powder using Zeolite was produced in the research. Chemical powder was adsorbed into Zeolite 13X, a porous material appearing negative catalytic effect, to create extinguishing powder obtaining core shell structure and measured physical properties and run a small scale fire extinguishment. SEM, XRD, TA analysis was also executed, and extinguishing characteristics were measured by fire extinguishing experiment on oil pool fire. The experiment showed that the average particle size of Zeolite 13X was equivalent, indicating about
and thermal analysis result illustrated that Zeolite 13X showed exothermic reaction peaks at
due to solid-state transformation. Extinguishing characteristics on oil fire of
/Zeolite 13X and
/Zeolite were improved, influenced by adsorbed extinguishing powders on Zeolite 13X and Zeolite 13X that contains high phase transition temperature.
Proposal of the Safety Technical Standards for Incineration Process in the Chemical Plants
Ma, Byung-Chol ; Kwon, Hyuck-Myun ; Kim, Young-Chul ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 64~69
The purpose of this study is to suggest new safety technical standards to improve the safety in the incineration process. Firstly, we analyzed the major accidents occurred in the incineration process since 1996 and proposed 4 articles which is required to be added newly to the existing KOSHA GUIDE. Secondly, we also performed the HAZOP study for each study node and also suggested 3 articles. Finally, we analyzed recommendations commented for PSM reports which have been submitted from the enterprise located in Honam province since 2005 and proposed 2 articles as well. We understand that all 9 articles proposed above, should be added to the KOSHA GUIDE in order to improve the safety in the incineration process and to prevent the major fire and explosion accidents in the design stage.
Experimental Studies on the Interactions between Propagating Flames and Different Multiple Obstacles in an Explosion Chamber with a L/D Ratio of 0.57
Park, Dal-Jae ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 70~77
Experimental investigations were performed to examine the characteristics of propagating flame fronts around multiple bars within a rectangular chamber. The explosion chamber is 400 mm in height,
in cross-section and has a large top-venting area,
. This results in a value of 0.44 for
and a L/D value of 0.57. The multiple obstacles of length 700 mm with a blockage ratio of 30 % were placed within the chamber. Temporally resolved flame front images were recorded by a high speed video camera to investigate the interaction between the propagating flame and the obstacles. Results showed that the flame propagation speeds before the flame impinges onto the obstacle almost equal to the laminar burning velocity. As the propagating flame impinged on the obstacle, the central region of flame began to become concave, this resulted in the flame deceleration in the region. As the flame interacted with the modified flow filed generated behind the central obstacle, the probability density functions(PDFs) of the local flame displacement speed were extensively distributed toward higher speeds.
A Study on the Chemical Powdering Process of Polypropylene Resin for Anti-slip Floor Paint
Kim, D.I. ; Chung, H.Y. ; Hwang, S.H. ; Cho, I.S. ; Youn, K.J. ; Cho, B.S. ; Kim, K.K. ; Yun, K.J. ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 78~83
In this study, some experimental results of the peroxide-degradation process of polypropylene(PP) in a co-rotating twin-screw extruder to produce controlled rheology polypropylene(CRPP) are presented. The peroxide was dicumyl peroxide(DCP) and the concentration of DCP was in the range 0-0.3 wt%. It was found that the rheological properties of PP change significantly during reactive extrusion. Melt flow index(MFI) increased with DCP concentration. Intrinsic viscosity decreases with increasing DCP concentration. From dynamic rheological data, number average molecular weight(Mn), weight average molecular weight(Mn) and molecular weight distribution(MWD) were calculated. Results indicated that Mw decreases and MWD becomes narrower with increasing peroxide concentration. Especially, particle size distribution of CRPP decreases with increasing DCP concentration by chemical powdering process, and anti-slip floor paint, CRPP(DCP 0.2 wt%) powder by 10phr was friction coefficient 2.15
, abrasion resistance 511.18%.
A Study on Stress Properties for Cable Anchorage zone of Cable Stayed Prestressed Concrete Box Girder
Tae, Ghi-Ho ; Kim, Doo-Hwan ; Byun, Yun-Joo ; Song, Kwan Kwon ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 84~92
Anchorage zone in prestressed concrete cable stayed bridges is very important area due to the more accurate analysis is needed to estimate the behavior. In the study, since the cable anchorage zone in the prestressed concrete cable-stayed bridge is subject to a large amount of concentrated tendon forces, it shows very complicated stress distributions and causes a serious local cracks. Accordingly, It is necessary to investigate the parameters of affecting the stress properties, such as the cable inclination, the position of anchor plate, the modeling method and the three dimensional effect. The tensile stress distribution of anchorage zone is compared to the actual design condition by varing the stiffness of spring element in the local modeling and an appropriate position of anchor plate is determined. These results would be elementary data to the stress state of anchorage zone and more efficient design.
Investigation of Aggregate Size Effect on Cracking Behavior in Concrete Fracture Test using Mechanoluminescent Paint
Lee, Chang Joon ; Kim, Wha-Jung ; Kim, Ji-Sik ; Jeon, Ki-Yong ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 93~98
In order to capture the fast crack propagation in an unmanipulated concrete fracture test, we employed mechanoluminascent(ML) material, which emits visible light when stressed, as a crack visualization tool. Three-point bending fracture test setup, a paint type ML material and a high speed camera were used to capture the images of fast moving cracks. The maximum size of coarse aggregates of concrete was used as an experimental parameter. The crack images, loading, and crack mouth opening displacement were successfully recorded as a function of time elapsed. From the test results, several interesting cracking behavior in the unmanipulated fracture test was observed in such that (1) the crack moves fast while the load is slowly decreased after the maximum loading, and (2) the crack in concrete with larger coarse aggregates moves faster than the others.
Evaluation of the Crack Width of the Ultra High Performance Concrete(K-UHPC) Structures
Kwahk, Imjong ; Lee, Jungwoo ; Kim, Jeesang ; Joh, Changbin ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 99~108
Ultra High Performance Concrete(UHPC) has compressive strength higher than 180 MPa. The use of steel fibers in the dense UHPC matrix increases tensile strength, ductility and bond strength between UHPC and rebars. However, to apply the advance material behavior of UHPC to the design of a structure, we need design formulas. The crack formula is one of them. This paper investigated experimentally the bond behavior of a rebar and K-UHPC, the UHPC developed by Korea Institute of Construction Technology, and, modified CEB-FIP crack formula based on the test. In addition, this paper tested the crack behavior of K-UHPC reinforced with rebars to verify the modified crack formula. The result showed that the modified formula is reasonable to predict the width of cracks in the reinforced K-UHPC structures.
Self-Healing Performance of Concrete Using Admixture
Lee, Jong-Yun ; Lee, Han-Joo ; Lee, Yong-Jin ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 109~114
This study is the things to experiment and evaluate the performance of self-healing water-proofing on the concrete to be using the crystal growth composite waterproofing admixture. The cylinder to be making on the concrete by
mm for evaluating the performance of self-healing water-proofing was aging 90 days and cut on a 50 mm. So, it prompted the crack and applied. After it measured the quantity of water to be flow the water throughout the crack part of the cylinder, it applied the basic formular of Darcy's law and calculated the coefficient of water permeability. So, it verified the performance of self-healing water-proofing on the basis of the changing shape of the water permeability. This experiment is the thing to be applied the general evaluation of the structure to demand the real watertightness on doing for the evaluating of performance of the quantity of water leak and self-healing water-proofing about the various penetration crack.
Reliability-based Structural Design Optimization Considering Probability Model Uncertainties - Part 2: Robust Performance Assessment
Ok, Seung-Yong ; Park, Wonsuk ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 115~121
This paper, being the second in a two-part series, presents the robust performance of the proposed design method which can enhance a reliability-based design optimization(RBDO) under the uncertainties of probabilistic models. The robust performances of the solutions obtained by the proposed method, described in the Part 1, are investigated through the parametric studies. A 10-bar truss example is considered, and the uncertain parameters include the number of data observed, and the variations of applied loadings and allowable stresses. The numerical results show that the proposed method can produce a consistent result despite of the large variations in the parameters. Especially, even with the relatively small data set, the analysis results show that the exact probabilistic model can be successfully predicted with optimized design sections. This consistency of estimating appropriate probability model is also observed in the case of the variations of other parameters, which verifies the robustness of the proposed method.
A Study on the Bearing Capacity of Steel Composite Concrete Lining Board
Paik, Shinwon ; Kim, Yongon ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 122~126
Steel lining board usually is used as a floor on the temporary steel bridges. It also is installed in the subway construction site. However, in particular in subway construction, renovations and site of old bridges, these steel lining board structures have a problem such as noise, accidents and slip hazards. So steel composite lining board is being developed to solve this problem. Steel composite lining board consists of compressive concrete showing excellent performance in slip, durability, resistance and noise, lower tensile and shear steel showing high safety, effective and superior workability in many respects. Steel composite lining board structure gradually is used in many construction sites, because it has a high quality such as durability, little noise and slip. In this study, flexural tests of steel composite lining board in accordance with welding patterns were conducted to compare the performance of the structure.
Mechanical Properties of Artificial Aggregate Concrete using the Crushed-stone Sludge
Hong, Ki Nam ; Park, Jae Kyu ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 127~132
In this study, ambient temperature curing artificial aggregate were developed by using crushed-stone sludge. In order to evaluate the mechanical properties, the artificial aggregate was tested on 7 items. Test results showed that the artificial aggregate mostly satisfied the basic requirements of normal aggregate. The concrete with the artificial aggregate made by weathered rock and granite sludge was tested on the compressive test and flexural test. From the test results, It is confirmed that the concrete with the granite artificial aggregate develope the higher compressive strength than the crushed rock aggregate and the concrete with artificial aggregate concrete have the lower elastic modulus and flexural strength than the concrete with crushed rock aggregate.
An Analysis of the Crack Cause of Concrete Faced Rockfill Dam
Chae, Young-Suk ; Lee, Myeong-Gu ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 133~137
Cracking may be used to help predict the cause of deterioration of concrete, since in many cases characteristic cracking patterns are produced. The purpose of this paper is an analysis of the crack cause occurred in concrete faced rockfill dams. We analyzed the concrete placement methods, cracking pattern, the inspection of crack depth by the ultrasonic pulse velocity method, and the measurement of heat of hydration, environmental condition, and so on. In this study, the crack cause of concrete faced rockfill dam is the wrong method of concrete placement, high temperature difference by cement of heat of hydration and concrete of drying shrinkage.
The Relationship between the Load Carrying Capacity and Transformed Impact Factor of Highway Bridge
Chai, Won-Kyu ; Lee, Myeong-Gu ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 138~143
In this thesis, the relationship between the load carrying capacity and the transformed impact factor of the highway bridges were studied. The bridges are classified according to superstructures type. The result of the comparison between the load carrying capacity and the transformed impact factor, if the load capacity ratio of 0.57, the transformed impact factor was less in order of RC T-beam bridge, RC slab bridge, PC beam bridge, I-beam bridge. By the regression analysis on these results, the empirical formulae to predict the the load carrying capacity of bridge were suggested.
Survey of the Characteristics of the Symptoms of Musculoskeletal Disorders among farmers of Fruits and Vegetables
Lee, Inseok ; Kim, Jihye ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 144~150
A survey was carried out to understand and analyze the characteristics of the symptoms of musculoskeletal disorders among farmers of pears, grapes, cucumbers, eggplants and various vegetables. One hundred and forty farmers participated in the study. It was found that task characteristics differ according to crops and the gender of the farmers. The fruits farmers mainly assume arm-elevated postures while vegetables farmers mostly take bent-back or squatting postures. The symptoms of musculoskeletal disorders are mostly reported in the low back, shoulder, and knee. Though the rates of symptoms of musculoskeletal disorders were not much different among the crops, the fruits farmers showed relatively higher rate of symptoms in the shoulder and neck than those of other crops. The rate of symptoms of female farmers was higher than that of male farmers, which is the similar results of other studies. The relatively low correlationship between the task characteristics and the rate of symptomes might be caused by the fact that most farmers are involved in various agricultural tasks that are not much different among different crops.
The Effects of Self-management on Supervisory Behaviors at a Construction Site
Lee, Kyehoon ; Lee, Jaehee ; Moon, Kwangsu ; Oah, Shezeen ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 151~159
This study implemented self-management technique to improve supervisory behaviors at a construction site. Self-management in the current study consisted of goal setting, self-monitoring and providing reward for two supervisory behaviors; (1) conducting safety observations of workers safety behavior and (2) providing safe related feedback. Two supervisors severed as participants. An AB within-group design was adopted. After baseline(A), self-management technique was implemented(B). Results suggested that self-management was effective in increasing the two supervisory behaviors. Moreover, the increased supervisory behaviors were associated with improvement in workers' safety performance.
Analysis of the Risk Factors and Design of the Safety Management Application for the Panel Line in a Shipyard
Oh, Hyunsoo ; Chang, Seong Rok ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 160~165
The process of panel line in the shipyard produce the panel of outside planking which is located the side and bottom of a ship. The stiffeners or plates are welded onto the plates in this process. In this study, the panel line was performed to work process analysis and was analyzed into the IDEF0(Integration Definition) model that is functional modeling methodology. Also the panel line was analyzed to find out the risk factor and expected accident/safety guide from each process. And then this outputs were applied to the IDEF0 model. The mobile application which is designed by ooCBD(Object-oriented Component Based Development) method is able to use the output data of the process analysis in the panel line. This mobile application could be used by employees and safety managers without regard for working location and time.
An Investigation of the Hydrological Safety for Downstream Areas Consideration of Dam Discharge
Jun, Kye-Won ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 166~171
This study aims to analyze the hydrological characteristics of downstream areas by the dam discharge of Soyanggang dam by using HEC-RAS Model. As a result of analyzing the data of dam discharge divided into hydropeaking discharge and total discharge, it as found that the maximum hydro-peaking discharge and the maximum total discharge have been 254.4 CMS and 1567.7 CMS respectively for the past 11 years. When the hydro-peaking discharge was applied to HEC-RAS Model, there occurred some sections where the water level rapidly changed, but the velocity of moving water was quite stable in the range between 0.23 m/sec and 1.16m/sec. Besides, when the total discharge was applied to this model, the submersible bridge along the dam downstream was flooded, and in some sections, the water level increased over the flood plain. Accordingly, this study judged that it is required to necessarily consider all the influence made by an increase of Soyanggang Dam's discharge when waterfronts are installed or used at dam downstream areas.
Analysis of Landslide and Debris flow Hazard Area using Probabilistic Method in GIS-based
Oh, Chae-Yeon ; Jun, Kye-Won ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 172~177
In areas around Deoksan Li and Deokjeon Li, Inje Eup, Inje Gun, located between
in latitude and
in longitude, large-sized avalanche disasters occurred due to Typhoon Ewiniar in 2006. As a result, 29 people were dead or missing, along with a total of 37.25 billion won of financial loss(Gangwon Province, 2006). To evaluate such landslide and debris flow risk areas and their vulnerability, this study applied a technique called 'Weight of Evidence' based on GIS. Especially based on the overlay analysis of aerial images before the occurrence of landslides and debris flows in 2005 and after 2006, this study extracted 475 damage-occurrence areas in a shape of point, and established a DB by using such factors as topography, hydrologic, soil and forest physiognomy through GIS. For the prediction diagram of debris flow and landslide risk areas, this study calculated W+ and W-, the weighted values of each factor of Weight Evidence, while overlaying the weighted values of factors. Besides, the diagram showed about 76% in prediction accuracy, and it was also found to have a relatively high correlationship with the areas where such natural disasters actually occurred.
Accident Models of Circular Intersections by Weather Condition in Korea
Park, Byung Ho ; Han, Su San ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 178~184
This study deals with the traffic accidents by weather condition. The objectives are to comparatively analyze the characteristics, and to develop the models of traffic accidents by weather condition. In pursuing the above, this paper gives particular attentions to testing the differences between two groups, and developing the models(Poisson and negative binomial regression) using the data of domestic circular intersections. The main results are as follows. First, three Poisson models and one negative binomial models which were all statistically significant were developed using the number of accident and EPDO by the clear weather and other as the dependant variables. Second, the differences between two models were comparatively analyzed using the chosen variables. This paper might be expected to give some implications to traffic safety policy-making to reduce and prevent the traffic accidents in circular intersections.
A Study on the Development and of Establishment Performance Evaluation Criteria of Working Truck Mounted Attenuator
Joo, Jae-Woong ; Jang, Dae-Young ; Park, Je-Jin ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 185~191
Rear collisions to expressway work trucks result many casualties these days. But, currently, no special measure are being taken except deploying sign trucks behind the working trucks. In the U.S and Europe, trucks with TMA(Truck Mounted Attenuator) are being deployed behind the working truck, which is regarded as the standard method for work area safety, thereby reducing the fatality rates and property damage tremendously. Also, standard for the performance of TMA are established and TMA can be used in the field only when it satisfies the standard. In Korea, neither the standard for nor any guide to the TMA exists. In the situation some manufacturer developed TMA without proper performance evaluation and marketed limited number of TMAs in the field. In the study, NCHRP350, which is the performance standard of expressway safety features of U.S. and materials related to the TMA standard in Europe have been reviewed to establish the Korean performance criteria. Based on the review, and incorporating existing Korean standard for crash cushions, domestic standard for TMA has been proposed and applied in developing Korean TMA and crash tested it to verify the performance. The original design developed was crash tested and modified. The newly proposed design was studied using impact simulation program several times. Modifications were made after each simulation and prototype was built and crash tested as per the newly established TMA performance criteria.
An Approach to Estimation of Radiological Source Term for a Severe Nuclear Accident using MELCOR code
Han, Seok-Jung ; Kim, Tae-Woon ; Ahn, Kwang-Il ;
Journal of the Korean Society of Safety , volume 27, issue 6, 2012, Pages 192~204
For a severe accident of nuclear power plant, an approach to estimation of the radiological source term using a severe accident code(MELCOR) has been proposed. Although the MELCOR code has a capability to estimate the radiological source term, it has been hardly utilized for the radiological consequence analysis mainly due to a lack of understanding on the relevant function employed in MELCOR and severe accident phenomena. In order to estimate the severe accident source term to be linked with the radiological consequence analysis, this study proposes 4-step procedure: (1) selection of plant condition leading to a severe accident(i.e., accident sequence), (2) analysis of the relevant severe accident code, (3) investigation of the code analysis results and post-processing, and (4) generation of radiological source term information for the consequence analysis. The feasibility study of the present approach to an early containment failure sequence caused by a fast station blackout(SBO) of a reference plant (OPR-1000), showed that while the MELCOR code has an integrated capability for severe accident and source term analysis, it has a large degree of uncertainty in quantifying the radiological source term. Key insights obtained from the present study were: (1) key parameters employed in a typical code for the consequence analysis(i.e., MACCS) could be generated by MELCOR code; (2) the MELOCR code simulation for an assessment of the selected accident sequence has a large degree of uncertainty in determining the accident scenario and severe accident phenomena; and (3) the generation of source term information for the consequence analysis relies on an expert opinion in both areas of severe accident analysis and consequence analysis. Nevertheless, the MELCOR code had a great advantage in estimating the radiological source term such as reflection of the current state of art in the area of severe accident and radiological source term.