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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Hazard Mitigation
Journal Basic Information
Journal DOI :
Korean Society of Hazard Mitigation
Editor in Chief :
Moo Jong Park
Volume & Issues
Volume 14, Issue 6 - Dec 2014
Volume 14, Issue 5 - Oct 2014
Volume 14, Issue 4 - Aug 2014
Volume 14, Issue 3 - Jun 2014
Volume 14, Issue 2 - Apr 2014
Volume 14, Issue 1 - Feb 2014
Selecting the target year
The Shear Strength Evaluation of the New Shear Connector by Push-out Test
Kim, Sung Bae ; Hwangbo, Chan ; Lee, Tae Gyu ; Cho, Han Sol ; Kim, Sang Seup ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 1~10
DOI : 10.9798/KOSHAM.2014.14.1.1
In a composite beam, a Shear connector is installed to resist the horizontal shear on the interface between steel beams and reinforced concrete slabs. The steel-wire-integrated deck plate slab is commonly used on the wide section beam. Then vertical bars are installed on the upper wire of the ends of the steel truss girder to ensure safety during construction. This paper develops a new shape shear connector which can replace the shear connector and vertical bar in a steel wire-integrated deck plate and evaluates shear strength by Push-out Test. 40 specimens were tested. Plate thickness and strength of concrete are parameters in Push-out Test. From the Pust-out Test, the new shear connector showed a higher shear capacity and ductility than a stud connector, and functioned as a vertical bar and shear connector.
Analysis of Evaluation for Flood Risk Architectural Heritage
Kim, Yi Hyeon ; Jeon, Seong Kon ; Lee, Man Seok ; Nam, Gil Jeung ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 11~18
DOI : 10.9798/KOSHAM.2014.14.1.11
This study is aims to evaluation for flood risk about Gyeongbokgung and Jongmyo in order to protect national architectural heritage as from various water hazards. In order to model rainfall-runoff and urban runoff and flood inundation, running softwares as HEC-HMS and SWMM and Arc-GIS Tool, then these 3 softwares apply to Gyeongbokgung and Jongmyo drainage area in Seoul, South Korea. Making 8 rainfall scenario from the existing gaged rainfall database, these 8 rainfall scenario database assist the evaluation of flood risk modeling results. In case of Gyeongbokgung drainage area, it is possible to flood which site as turn into pipe line from open channel, whereas in case of Jongmyo drainage area, it is possible to flood due to insufficiency of drainage capacity outside of the drainage area. Evaluation method for flood risk modeling processing in this study, this method is good for evaluating flood and inundation in urban area`s national architectural heritage.
Evaluation of Extreme Wind Fragility for Balcony Windows Installed in Mid/Low-Rise Apartments
Ham, Hee Jung ; Yun, Wooseok ; Kim, Ho-Jeong ; Lee, Sungsu ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 19~26
DOI : 10.9798/KOSHAM.2014.14.1.19
This paper presents an assessment of extreme wind fragility for balcony windows installed in mid/low-rise apartments. A Monte Carlo simulation model is developed to estimate extreme wind fragility by comparing the statistics of resistances of balcony windows and wind pressures. Balcony windows installed in twelve prototype apartments considering different building heights & widths and roof shapes are investigated using simulation and system reliability concepts. Fragilities estimated in this study are developed with the consideration of three exposure categories (ie., B, C and D) & four damage levels and are modeled using parameters of lognormal distribution as their final forms. The assessed fragility obtained by the described methodology can be used when potential damages of mid/low-rise apartments need to be estimated in high wind regions.
A Study on the Experimental to Establish Combustion Properties DB Accordance to Vehicle Model Categorizes at Parking Space
Kang, Seung Goo ; Kim, Dong Eun ; Seo, Dong Goo ; Kim, Dong Jun ; Kim, Jeong-Hee ; Kwon, Young Jin ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 27~33
DOI : 10.9798/KOSHAM.2014.14.1.27
Car combustion experiment was conducted by selecting 3 cars, medium sedan, large sedan and van, for modeling of heat release rate(HRR) on car fire at parking space. Lists of measurement are internal and external temperature, HRR, mass decrement, and according to the result of experiment, it is considered that it requires review of fire resisting capacity of structure by temperature characteristic of internal and external temperature, and location of parking space structure. as a result review of fire resistance is needed. Also, Total HRR, burning speed, and heat of combustion of car were secured, and modeling of HRR for each car classification was written by using HRR. As a result, error range of total calorific value between experimental value and model value was within 10%, and it proposed combustion characteristic DB by car classification for fire resistance design of parking space structure.
Experimental Study on the Fire Resistance Performance of Prestressed Composite Beam with Corrugated Web
Cho, Bum-Yean ; Kim, Heung-Youl ; Kim, Hyung-Jun ; Kang, Hyun ; Kim, Kang-Su ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 35~41
DOI : 10.9798/KOSHAM.2014.14.1.35
In this study, the fire resistance tests were performed on the conventional slim floor beam and the prestressed composite beams with corrugated webs, which is suitable for the long-span structure with a reduction in story height by utilizing the prestress and accordion effect. In the fire test program, the ISO 834 standard fire curve was adopted, and key test variables were effect of prestress, shape of corrugated webs, and thickness of sprayed fire proofing material. All of test specimens showed enhanced fire resistance performances exceeding the expected performance level, and the prestressed composite beams with corrugated webs especially showed the excellent fire performances considering that these specimens had thin fire proofing thickness compared to conventional slim floor specimen.
An Experimental Study on the Temperature Behavior Characteristics of the Concrete Segment
Cho, Bum-Yean ; Kim, Heung-Youl ; Kim, Hyung-Jun ; Kwon, In-Kyu ; Won, Jong-Pil ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 43~48
DOI : 10.9798/KOSHAM.2014.14.1.43
As the plan to subsea tunnels was announced in Korea, how to secure fire-resistance of the concrete linings in shield tunnels has been emerging as an important issue. Reinforced concrete segment used inside of shield tunnels is structural member which resists loads such as earth pressure or hydraulic pressure. Since high-strength concrete having compressive strength of over 40 MPa is used, significant damage to the segment is foreseeable upon a fire unless elaborate measures are taken against a fire. Therefore, in this study to find how to improve safety of concrete structure in shield tunnels, damage range observed from full-scale fire resistance test was compared with that observed from fire resistance test provided by the EFNARC (European Federation for Specialist Construction Chemicals and Concrete Systems) and the behaviors of concrete linings in the fire tests were evaluated.
A Study on Classifying Algorithm of Disaster Recovery Resources Using Statistical Method
Han, Sumin ; Hwang, Gyusun ; Choe, Sangyun ; Park, Jinwoo ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 49~58
DOI : 10.9798/KOSHAM.2014.14.1.49
In South Korea, the damage caused by typhoons and downpour has the biggest proportions in total damage. Moreover, their damages are biased to riverside structures. To deal with the disasters like typhoons, disaster response system that takes charge of preparation, emergency response, and recovery attracts public attention. This study is concerned about the emergency response resource management. This study suggests the advanced classification algorithm, which classify disaster response resources along their attributes in dynamic situation. Classification result from suggested algorithm may support decision processes under dynamic emergency. In this study, we arrange the information of response resources and use PCA and Clustering analysis to classify the resources. After that, we execute the simulation study with randomly generated dataset to examine the performance of suggested algorithm.
Finite Element Deflection and Stress Analyses of Laminated Composite Shell Structures Using Micro-mechanical Approaches
Lee, Sang-Youl ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 59~65
DOI : 10.9798/KOSHAM.2014.14.1.59
This study carried out finite element deflection and stress analysis of laminated composite shells, which is based on the micro-mechanical approach for different fiber-volume fractions. The finite element (FE) models for composite structures using multi-scale approaches described in this paper is attractive not only because it shows excellent accuracy in analysis but also it shows the effect of the material combination. The FE model is used for studying static behaviors of laminated composite shells for various fiber-volume fractions. In particular, new results reported in this paper are focused on the significant effects of the fiber-volume fraction for various parameters, such as fiber angles, layup sequences, and length-thickness ratios. It may be concluded from this study that the combination effect of fiber and matrix, largely governing the structural performance of composite structures, should not be neglected and thus the optimal combination could be used to design such civil structures.
Anchorage Zone Behavior in the Slab with Flat Anchorage
Kim, Jin-Kook ; Kwon, Yangsu ; Kwak, Hyo-Gyoung ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 67~76
DOI : 10.9798/KOSHAM.2014.14.1.67
In this paper, the behavior of anchorage zone was investigated based on the experiment and analysis results. The geometric shape of anchorage, details of reinforcement in local anchorage zone and general anchorage zone, that are major components of anchorage zone, were chosen as test variables. Three specimens among six used the anchorage with the transverse rib for additional bearing area, and the others have no rib in their anchorage. Among them, two specimens have additional hoop reinforcement in the local anchorage zone and other two specimens have additional hoop reinforcement in the general zone. It was found that the transverse rib of anchorage and additional local reinforcement could increase the ultimate strength of anchorage zone by enhancing stress distribution in the local zone around the anchorage. For the efficient design of the anchorage zone, it is proposed that not only additional reinforcement around the anchorage with the length of 60% anchorage zone width but also the anchorage with transverse rib should be used.
An Experimental Study on Flexural Behavior of Beams with the Minimum Flexural Reinforcement Ratio Specified in Eurocode
Moon, Do Young ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 77~84
DOI : 10.9798/KOSHAM.2014.14.1.77
The minimum reinforcement ratio at ultimate limit state specified in Eurocode is merely 67% of that in domestic code. In this study, flexural behavior of beams with the minimum reinforcement ratio specified in Eurocode was examined. Eight beam specimens of moderate strength concrete, 40 MPa and 60 MPa, and high tension rebar, 400 MPa, 500 MPa and 600 MPa were fabricated and tested until failure. In results, the ratios of nominal flexural strength to cracking moment were ranged in 1.3~1.8. Consequently, it is confirmed that the beam with the minimum reinforcement ratio specified in Eurocode has enough safety margin in structural point of view. And, it is proved that the enough safety margin is originated from over prediction of nominal flexural moment and underestimation of cracking moment.
An Experimental Study on Crack Recognition Characteristics of Concrete Structure based on Image Analysis according to Illuminance and Measurement Distance
Cho, Hyun-Woo ; Yoon, Hyuk-Jin ; Park, Jung-Jun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 85~91
DOI : 10.9798/KOSHAM.2014.14.1.85
Natural disaster has been increased by climate change. SOC structure needs to check the crack or the damage periodically to prevent the collapse caused by natural disaster and ensure the safety. To replace the visual inspection with automatic inspection system based on image processing, crack recognition algorithms have been developed. However, the effect of illuminance, brightness and measurement distance has to be considered to use the automatic crack inspection system in the field. In this paper, we evaluated the crack width of recognition by changing the illuminance and the measurement distance using several simulated crack specimens described various brightness attached on the concrete tunnel. The result showed that the recognizable crack width grew with the increase of measurement distance and decrease of illuminance. This result can be used as a reference when the image detection system is applied to the field.
Estimation of Frequency Based Snowfall Depth Considering Climate Change Using Neural Network
Kim, Yonsoo ; Kim, Soojun ; Kang, Narae ; Kim, Taegyun ; Kim, Hungsoo ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 93~107
DOI : 10.9798/KOSHAM.2014.14.1.93
In recent years, extreme weather event due to the climate change has been frequently occurred over the world. Meanwhile, Korean peninsula has been suffered from the natural disasters such as snowfall. This study estimated the snowfall depth of climate change by using temperature, precipitation based on KMA-RegCM3 climate model and climate change scenario. We estimated the frequency based daily snowfall depth(50yr, 80yr, 100yr and 200yr) at 18 weather stations for four different target periods(Target I: 1971~2010, Target II: 2011~2040, Target III: 2041~2070, Target IV: 2071~2100) under climate change. Snowfall has nonlinear relationship with temperature and precipitation and so this study used a neural network and multiple regression models which can consider nonlinearity between snowfall and meteorological variables for its forecasting. As the results, the average rate of frequency based snowfall depth will be decreased by 6~18% for Target I and the rate will be continuously decreased in Target II, III and IV. The results of this study could be used as the basic information for the future disaster prevention planning and design criteria related to snowfall.
A Case Study of A Sharp Surface Temperature Drop Over the Daegwallyeong Ridge
Lee, Jae Gyoo ; Kim, Yu Jin ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 109~123
DOI : 10.9798/KOSHAM.2014.14.1.109
From the analysis of weather charts, satellite imagery, AWS (Automatic Weather Station) observation data, skew T-log P diagram and GDAS (Global Data Assimilation System) FNL (Final analyses) data, we could infer the reasons for the sharp drop over a short amount of time (
/9 minutes) in surface temperatures at the Daegwallyeong observation station on 16 April 2013 as follows: (1) there was a continuous temperature increase near the Daegwallyeong area under the influence of the warm southwestern air current and solar radiation in the daytime. Meanwhile, there was a steady temperature decrease over the Yeongdong coastal area due to the cold-air advection form the northeast, (2) under this circumstance, the topography of the Taebaek Mountains separating the Yeongseo and Yeongdong Regions prohibited heat exchange between the Yeongseo and Yeongdong Regions to increase the temperature contrast between the two regions, and (3) as a trough moved toward Ulleung-do, the easterly flow strengthened in the gulf of Donghan and over the Yeongdong coastal area which was located behind this trough. Accordingly, the cold air damming was magnified, leading to the overflow of the cold air. Thus, the accumulated cold air moved westward over the Daegwallyeong, and the warm air staying there until this time was replaced rapidly by the cold air. Consequently, the surface temperature at the Daegwallyeong Observation station dropped sharply.
Estimation of Static and Dynamic Lateral Bearing Capacity of New Concept Micropile for Applying to Artificial Ground of Railroad Site
Han, Jin-Tae ; Jang, Young-Eun ; Choi, Jungin ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 125~134
DOI : 10.9798/KOSHAM.2014.14.1.125
Recently in Korea, the policy is being proceeded to build rental houses on artificial ground of railroad site. Due to narrow space of rail road site, a suitable method has to be developed. Therefore, a new concept micropile was recently suggested in order to improve both bearing capacity and cost efficiency of a general micropile. The new concept micropile consists of waveform cement grout surrounding tread bar that formed by grouting the soil layer with jet grouting method as control the grout pressure and flow. In this study, the static and dynamic lateral behavior of the new concept micropile was examined by numerical analysis. As a result of the numerical analysis, the static and dynamic lateral resistance of the waveform micropile were larger than a general micropile in terms of lateral displacement and compressive stress of the pile. However, the length and space of the wave did not have much effect on the lateral resistance of the waveform micropile.
Studies on Bearing Characteristics of Prebored Screw Pile Using Laboratory and Field Tests
Lee, Chung-Won ; Kim, Yong-Seong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 135~144
DOI : 10.9798/KOSHAM.2014.14.1.135
At the present time, pile driving method and auger-drilled pile method is predominant method in pile construction of Korea. But pile driving method is getting difficult to use for the problem on a noise and a vibration as the subject of a civil appeal in many cities. So, auger-drilled pile method was developed as low noise and vibration method for substitution of that. However, this method has a drawback that the bearing capacity of pile is not guaranteed unless a slight driving is performed, it is impossible to solve that problem perfectly. In this study, as low-noise and vibration method for improvement of those problems, prebored screw pile method which is constructed by rotary penetration of screw pile into the prebored hole filled with some cement milk whose diameter is smaller than that of the screw pile is proposed. And for determination of shape of screw pile, laboratory test with model screw piles was conducted, and then, field load test on real screw pile fabricated on the basis of the result of laboratory test and SIP was also carried out. Based on these results, the formulae for prediction of both the end bearing capacity and the unit skin friction were proposed.
Influence of Damaged Geosynthetic Mat to Dredged Sea Sand Fill inside a Tide Embankment
Lee, Chung-Won ; Chang, Dong-Su ; Park, Sung-Yong ; Kim, Yong-Seong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 145~154
DOI : 10.9798/KOSHAM.2014.14.1.145
In order to investigate the behavior of dredged sea sand fill compacted inside tide embankments with damaged geosynthetic mat, centrifugal model tests were conducted with sea level variations. Results of vertical displacements, investigation by observation and excavation, and image analysis from the three centrifugal model tests considering particle size conditions of rubble mound and filter layers, and damage of geosynthetic mat were examined. The results demonstrate that the subsidence of the dredged sea sand fill inside tide embankments with the damaged geosynthetic mat was strongly affected by the loss of dredged sea sand into the filter layers for large filter particles and by a decrease in the bearing capacity of the filter layers for small filter particles.
Evaluation of Behavior Characteristics of Reservoir Levee Subjected to Increasing Water Levels
Lee, Chung-Won ; Chang, Dong-Su ; Park, Sung-Yong ; Kim, Yong-Seong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 155~165
DOI : 10.9798/KOSHAM.2014.14.1.155
Centrifugal model testing has been widely used to study the stability of levees. However, there have been a limited number of physical studies on levees considering velocity of increasing water levels. In this study, to investigate the behavior of reservoir levees with different velocities of increasing water levels, centrifugal model tests and seepage-deformation coupled analyses were conducted. The results from the centrifugal model test and the numerical analysis demonstrate that increasing water velocities induces dramatic increases in the displacement and pore water pressure, so that the levee stability is possibly degraded. Hence, real-time monitoring of the displacement and the pore water pressure of a levee is important to ensure the levee stability.
An Experimental Study on the Efficient Installation Method of Reinforcement for Reinforced Retaining Wall
Hwang, Sungpil ; Im, Jongchul ; Hong, Sugwan ; Song, Yoonseok ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 167~173
DOI : 10.9798/KOSHAM.2014.14.1.167
The paper proposes the efficient installation method of reinforcement reinforced retaining wall. Stability of retaining wall is increased by installing reinforcement between soil. Optimal height and optimal length of reinforcement were determined by the laboratory model test. Optimal height of reinforcement is a point of application of total force on the retaining wall. Optimal length of reinforcement is 500/700(reinforcement length / height of retaining wall). Effect of fixing reinforcement to the retaining wall is increased by increasing lateral displacements.
Reinforcement of Posts on Embankment and Development of a SB3-B Flexible Barrier
Kim, Kee Dong ; Park, Kyoung Yong ; Ko, Man Gi ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 175~185
DOI : 10.9798/KOSHAM.2014.14.1.175
The guidelines for the installation and management of roadway safety features, revised in November 2012, is regulating the standard performance test for roadside longitudinal barriers to be implemented on an embankment instead of a flatland. Furthermore, the post installed on an embankment should have the resisting force of a construction site higher than 90% of that of a test site. In this study, a variety of post reinforcement methods were investigated in order to strengthen the lateral resisting force of the post installed on an embankment. When increasing the post embedded depth to 1.7 m from a non-reinforced post with an embedded depth of 1.4 m, an increase of 33% in resisting force occurred. For the case of having a small cross section and a small flexure length of the reinforcing plate wrapping a post, out of various forms of reinforcing plates, the constructability was excellent and the resisting force increased by 70% approximately. For the reinforcement method using a bracing member, the increase of approximate 78% occurred in resisting force. A SB3-B flexible barrier that uses the same as the components of the SB5-B flexible barrier which passed the flatland performance test was developed. Post spacing and post reinforcement methods appropriate for SB3-B impact conditions were determined by various computer simulations, and the final performance was verified through full-scale vehicle crash tests.
Superposed Simulation Data for Curb Effects on Impact to Roadside Guardrail
Ko, Man-Gi ; Hong, Seong-Uk ; Kim, Kee-Dong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 187~197
DOI : 10.9798/KOSHAM.2014.14.1.187
Most of the domestic urban streets, arterial roads and highways have roadside guardrail with curbs in front. In the area, when a car leaves traffic lane, the car will hit the curb first subsequently hitting the guardrail with very unstable turbulence caused by the prior curb hit resulting in very different vehicle motion and passenger safety compared with the same impact but to a fence installed without curb in front. Since safety fences in Korea are impact tested without curb but installed with curb on the road, differences in vehicle motion and passenger safety those two fences make need to be studied and measure to reduce the gap between the two different installation conditions have to be sought out. For that end, LS-DYNA simulations are made for an impact to safety fence installed without curb, impact to elevated sidewalk with curb, impact to safety fence installed offset backward from roadside curb are made. Then, estimation of vehicle data for the impacts to safety fence with curb by superimposing vehicle data of impact to fence without curb upon that of impact to elevated sidewalk with curb. The estimation by superposing two impact data is compared with the data of impact to safety fence with curb in front, and acceptability of the estimation method is discussed.
Development of SB5-B Rigid Barriers for Bridges and Roadside
Han, Ki Jang ; Choi, Young Goo ; Ko, Man Gi ; Kim, Kee Dong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 199~208
DOI : 10.9798/KOSHAM.2014.14.1.199
In this study, the methods to apply the existing SB5-B rigid median barrier to rigid barriers for bridge rails and roadside safety were suggested. Since rigid barriers for bridge rails and roadside safety do not need glare screen on top, the effective height of rigid barriers required to provide suitable vehicle protection were investigated through Hirsch`s method and computer simulation using LS-DYNA program. The strength performance of rigid barriers was examined by yield line analysis. For roadside rigid barrier, two types of foundations such as spread footing and pile foundation were designed, and the stability was investigated by considering the equilibrium of rigid barriers subjected to design loads. It has been shown through computer simulation applying SB5-B impact condition that the developed rigid barriers can satisfy the safety performance evaluation criteria for structural adequacy, occupant risk, and post-impact vehicular response. And it has also been shown that the barriers are more economical and efficient in safety performance than the existing barriers.
Evaluation of Impact Load for the Design of Parkade Steel Barrier
Ko, Man-Gi ; Kim, Yong-Guk ; Kim, Kee-Dong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 209~222
DOI : 10.9798/KOSHAM.2014.14.1.209
This study is to present the impact load for designing steel barrier for parkade. For the evaluation of impact load, barrier structure must be determined first. Even two barriers are made of the same beam and post members, structural stiffness differs depending on the base type and interval of posts, which result in different impact responses. Therefore, to get the general impact load for designing steel barrier for parkade, various base types and span lengths must be considered. In this study, barrier made of W-beam and steel tube posts of
with 1 m to 3 m span with 0.5 m increment were studied. For each structures, two impacts, one onto the central post and the other onto the middle of central span beam were considered. Barrier VII simulation and Olson model were utilized for the impact load. Impact loads were calculated from the vehicle accelerations Barrier VII simulations produced. The deformations from the Barrier VII simulations were used in calculating impact loads by Olson model.
The Point at Issue and Improvement of Natural Disaster Insurance Rate System
Lee, Hee-Chun ; Park, Sung-Yong ; Lee, Choon-Ho ; Kim, Yong-Seong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 223~231
DOI : 10.9798/KOSHAM.2014.14.1.223
Generally, a standard of insurance rate is rationally graded or applied according to size of risk(degree of risk) but present natural disaster insurance applies same insurance rate regardless of measuring size of risk(degree of risk) and classifies each 230 cities and districts into one risk grade. Accordingly, the current insurance rate is unfairly discriminatory as it is supposed to be graded and applied with the standard of insurance rate regarding size of risk. This thesis is to investigate and research flood insurance risk classification system of each country such as the US and Europe and it, on basis of research, suggests a natural disaster insurance manual rate system which can be graded and applied according to size of risk. Therefore, we, according to degree of risk, propose the newly designed class rate system as we regard the inundation depth and inundation area as a weight for rate discrimination.
A Study on Law Analysis for Efficient Critical Infrastructure Protection
Choi, Dong Sik ; Yoon, Kyung Ho ; Shin, Jin Dong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 233~245
DOI : 10.9798/KOSHAM.2014.14.1.233
If critical infrastructure(CI) is stopped by natural or social disaster, property and life of people or security will be dangerous. Systematization and efficiency need to be improved to effectively respond to emergency of critical infrastructure. So, in this study two improvement suggestion are proposed for efficient protection plan through analysis of frequency and contents about laws regarding critical infrastructure. As a result of this research 1,542 provisions are found. But this laws have a overlap problem and lack of dependency between critical infrastructure. To resolve this problem, clear separation of critical infrastructure protection plan and laws regarding critical infrastructure was proposed. And critical infrastructure protection plan have to be draw up considering interdependency among critical infrastructures for systematic protection.
An Examination of the Functions and Usages of Mobile Applications for Disaster and Safety Management in Korea
Kim, Younhee ; Lee, Jaebeom ; Kim, Youngjun ; Yoon, Dong Keun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 247~255
DOI : 10.9798/KOSHAM.2014.14.1.247
Mobile applications have been widely and variously used as effective tools in disseminating disaster preparedness and response information by the governmental organizations. This study examined the functions and usages of mobile applications developed by the governmental organizations for disaster and safety management in Korea. The total of 21 public mobile applications was examined and compared in terms of their functions, service types, usages based on the number of downloads, and user ratings. Based on the examination results, this paper suggested policy implications and considerations for the public application development in the disaster and safety management.
A Study on Body Balance of Firefighter Wearing Fire Protective Equipments
Huh, Yu-Sub ; Bang, Chang-Hoon ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 257~262
DOI : 10.9798/KOSHAM.2014.14.1.257
The aim of study intends to investigate a study on body balance of firefighter wearing fire protective equipments and to provide the basic data for the safety of firefighter. The results of the study are as follows; Static balance tests with closed-eyes foot balance, firefighter protective clothing(Group A), firefighter protective clothing and Self-contained breathing apparatus(Group B), firefighter protective clothing, Self-contained breathing apparatus and 10 kg jacket(Group C), among three groups were statistically significant and in other tests, the difference was not statistically significant. The balance comparisons between firefighting and rescue & EMS was not statistically significant among three groups. For balance checks about career, closed-eyes foot balance with the heaviest Group C is appeared statistically significant and the results of the rest test are not statistically significant.
Changes of Blood Glucose and Lactate Concentration in Body Wearing Firefighting Protective Equipments
Bang, Chang-Hoon ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 263~268
DOI : 10.9798/KOSHAM.2014.14.1.263
The aim of study intends to investigate changes of blood glucose and lactate concentration with wearing firefighting protective equipments and to provide the basic data for the safety of firefighter. The results of the study are as follows; Glucose decreased by 6.0% in the 3 METs, 13.0% in the 9 METs at WBGT
. Glucose decreased by 9.0% at WBGT
, 11.3% at WBGT
in the 9 METs. Lactate increased by 78.3% in the 3 METs, 150.0% in the 9 METs at WBGT
. Lactate increased by 87.5% at WBGT
, 127.3% at WBGT
in the 9 METs. It is concluded that blood glucose and lactate concentration varied considerably and reflected by firefighting protective equipments.
A Study on Securing Fire Safety of the Evacuation Space in Apartment Buildings
Seo, Hee Won ; Kim, Dae Hoi ; Wang, Nam Woong ; Park, Soo Young ; An, Jae Hong ; Choi, Dong Ho ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 269~276
DOI : 10.9798/KOSHAM.2014.14.1.269
The mock-up tests were performed to evaluate fire safety of the Evacuation Space in Apartment Buildings. The fire safety could not be secured in case that the un-insulated fire door was installed on the exit according to the present building laws. But, the fire safety could be secured in case that the fire door having a insulation performance of 30 minute or more was installed on the exit. Therefore, the related system must be improved for the fire door having a insulation performance of 30 minute or more to be installed on the exit of the Evacuation Space in Apartment Buildings.
A Study on the Stability for the Railroad Bed and the Foundation Ground (High Landfill Slope)
Oh, Soon-Taek ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 277~283
DOI : 10.9798/KOSHAM.2014.14.1.277
Ground response analysis of the railroad bed and finite element analysis in the bridge connection section of high landfill slope was analyzed. Also, slope stability analysis was accomplished. In the case considered earthquake and train vibration in the bridge connection section of high landfill slope, slope stability is decreased by the average of 20% and displacement is increased more than 100%. Therefore, it is concluded that stability analysis considering earthquake and train vibration is necessary for long-term stability of the railroad bed and the foundation ground.
Effect of Steel Slag-based Seismic Foundation Isolation System on Seismic Load Reduction
Son, Su Won ; Jeon, Hong Woo ; Ryu, Jeong Ho ; Kim, Jin Man ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 285~290
DOI : 10.9798/KOSHAM.2014.14.1.285
Seismic isolation systems including Laminated Rubber Bearing(LRB) and Friction Pendulum System(FPS) have been being used to improve the seismic performance of bridge structures. This paper studied the seismic load reduction effect of a steel slag-based seismic foundation isolation system by using 1-G shaking table tests. The result shows that ground acceleration reduces significantly through soft clay ground to the foundation isolation system, and it further reduces through the foundation isolation system. Numerical analyses show similar results. These results show that the seismic foundation isolation system is effective in seismic performance improvement of bridge structure.
Analysis of Urban Flood Damage Characteristics Using Inland Flood Scenarios and Flood Damage Curve
Shin, Ji Yae ; Lim, Sung Min ; Kim, Joong Hoon ; Kim, Tae-Woong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 291~301
DOI : 10.9798/KOSHAM.2014.14.1.291
Recently, in Korea, localized heavy rainfall events have occurred frequently due to climate change. Especially, since urban areas depend heavily on pump and pipe systems, extreme rainfalls that exceed the design capacity of drainage facility result in increasing inland flood damage. This study proposed a methodology to analyze urban flood damage characteristics in inland flood prone areas. After firstly constructing rainfall scenarios which have various durations and intensities, inland flood scenarios were developed using XP-SWMM. This study presented the inland flood damage analysis (IFDA) to calculate inland flood damage from the inland flood scenarios. Based on the inland flood scenarios and corresponding flood damage curves, the characteristics of damage due to inland flood were analyzed using the relationships among precipitation depth, flood depth, and flood area. The proposed method can be used to identify the storm event resulting in heavy flood damage, and to predict the flood area, depth and damage from various storm events.
A Strategy on Optimizing a Stream Gauging Network to Mitigate the Flood Risk in a Disaster Risk Area
Kim, Soojun ; Joo, Hong Jun ; Kim, Hung Soo ; Jun, Hwandon ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 303~310
DOI : 10.9798/KOSHAM.2014.14.1.303
The data of stream gauging stations connected to the upper and lower stream have similar hydrological characteristics. It is also very important data for disaster management. In this study, we suggest a methodology which is used to build an optimal stream gauge network for mitigating the flood risk of a disaster risk area by adding new stream gauges at disaster risk areas to the existing stream gauge network. The upper stream basin of Geum river was selected as a study area. Representative unit hydrograph was estimated by Clark method in each station. And the information transmission by entropy analysis were evaluated based on the log-normal distribution. The optimized stream gauging networks about three scenarios of the gauging stations were determined using the entropy theory. Finally the most important gauging station was selected using the received information transmission in each disaster risk area and the whole basin.
Determination of Tsunami Height Distribution with L-moment Method
Kim, Byeong Jun ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 311~317
DOI : 10.9798/KOSHAM.2014.14.1.311
Recently, the necessity for mitigation against devastating and unexpected tsunami attacks is significantly increasing. In this study, a combination of numerical and statistical techniques was used to estimate tsunami heights and investigate a best-fit distribution. By using a numerical simulation, tsunami heights were obtained along the Eastern Coast of the Korean Peninsula and they were used for applying L-moment method as the sample data. The best-fit distributions were determined by an L-moment ratio diagram. The distribution of tsunami heights along the Eastern Coast of the Korean Peninsula was mainly represented by the generalized Pareto distribution.
Proper Location of Disaster Shelters according to Evacuation Time - Focused on Coastal Areas in Hongseong Gun
Chang, Jeong Keun ; Kim, Sung Gil ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 319~326
DOI : 10.9798/KOSHAM.2014.14.1.319
The purpose of this study is to analyse effective plan for proper location selection of disaster shelter by using `Time Distance` algorithm. In consideration of population characteristic and terrain elements of coastal areas in Hongseong Gun was analysed movable range of evacuation by walk and automobile. Three proper positions of disaster shelter were determined in the study area split into three spheres in order that all the residents can take shelter. In consideration of safety from large-scale disaster, such as tsunami were analysed the suitability of two secondary disaster shelters in according to evacuation time. By regarding not only primary but secondary shelter in determining of disaster shelter location in coastal areas is to deal with crisis in according to type and scale of disasters. The result of this study considered moving by walk as well as by automobile can contribute to a fundamental information for realistic route plan without congestion on road.
Assessment of Constructed Wetland of Removal Efficiency of Non-point Source Pollution by Rainfall Characteristics in Wolmun Stream
Chung, Woojin ; Lee, Ilkook ; Lee, Sijin ; Chang, Soonwoong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 327~332
DOI : 10.9798/KOSHAM.2014.14.1.327
The landuses of urban have various types such as commercial, residential official and industrial areas. The NPS(nonpoint source) pollutants are generally proceeded from pavement areas in urban by human activities. The Korea MOE(Ministry of Environment) is evolving the NPS control system. However, it is not easy to control the NPS and it has uncertain eliminated to watershed. In this study, it was investigated about inflow characteristics of BOD, COD, SS, T-N and T-P by total of 10 monitoring. The event mean concentration (EMC) was calculated for the non-point pollutants reduction rate of constructed wetland(CW). The reduction rates of SS, BOD, COD, T-N and T-P were 83.74%, 76.10%, 73.53%, 50.30% and 59.82%, respectively. It was used to consider the correlation analysis. The BOD and COD value were applied to determine the correlation with total rainfall. The highly correlation with BOD concentration were observed for total rainfall.
Assessment of Efficiency for Constructed Wetlands to Reduced Non-point Source Pollution
Moon, DeaHyun ; Lee, IlKook ; Kim, JiTae ; Chang, SoonWoong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 333~339
DOI : 10.9798/KOSHAM.2014.14.1.333
Constructed wetland is non-point pollutants reduction facility to removed contaminants improve artificially the purification capacity of natural. In this study, has been conducting monitoring of three years for the management of constructed wetland efficient and it was to grasp the flow characteristics in rainfall effluent nonpoint source pollutant which flows out to the constructed wetland. In addition, efficiency calculated as a result of EMC(Event Mean Concentration, EMC), SOL(Summation of Loads, SOL), ROL(Regression of Loads, ROL), ROFM(Rainfall of Frequency Method, ROFM), EMC efficiency is 38.4%~49.1%, SOL efficiency is 40~80%. As a result, when all the facts are considered for constructed wetland that SOL is appropriate.
Assessment of Antibacterial Activity on Growth Inhibition of E. coli by TiO
Chang, SoonWoong ; Kim, HanSang ; Lee, IlKook ; Lee, SiJin ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 1, 2014, Pages 341~346
DOI : 10.9798/KOSHAM.2014.14.1.341
In this study,
/HAP/Ge composite was used to coating agent for antimicrobial effect. Titanium dioxide (
) has the limitation for application that depend on light source and irradiation intensity. To solve this reason, hydroxyapatite (HAP) and germanium (Ge) were used to enhance the activity of
. and, the comparison of the antimicrobacterial function was conducted by the inhibition rate of E. coli growth. For the result, it was observed that the
/HAP/Ge behaves the highest E. coli. reduction efficiency for single
added composite. and, the kinetic results were also showed that the antibacterial potential of
/HAP/Ge composite was more effective for growth inhibition of E. coli. These result was due to the enhanced photocatalytic activity by sygergistic effect with HAP and Ge.