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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 10, Issue 6 - Dec 2010
Volume 10, Issue 5 - Oct 2010
Volume 10, Issue 4 - Aug 2010
Volume 10, Issue 3 - Jun 2010
Volume 10, Issue 2 - Apr 2010
Volume 10, Issue 1 - Feb 2010
Selecting the target year
Study on the Escape Safety of University Dormitory with the Consideration of Plan Types
Jeong, Hyeon-Jae ; Jeong, Gun-Sik ; Ahn, Young-Chull ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 1~7
University dormitory has some weaknesses against disaster such as fire because of high population density and strict control of access in night time. The purpose of this study is suggestion of a guide of effective floor plan for improvement of evacuation safety. Plans for preventing disasters are studied and evacuation safeties are analysed using network model analysis method according to plan types. The weakness of disaster prevention is quantified, and effectiveness of bidirectional evacuation is confirmed. The circuit type floor plan shows best evacuation characteristics and this result is anticipated to be adopted to design process of new dormitories and will contribute to improvement of evacuation safety.
A Study on the Survey of Requested Contents for Living Safety Web DB
Lim, Dong-Hyeon ; Kim, Jin-Wook ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 9~16
For improving social safety, It is important to build Web DB of criminal prevention and open to the public. It could be help to mitigate social damage of crimes and accidents. In this study, the main goal is to analyze and apply the applicable contents from user demands studies and case studies for a domestic life safety Web DB. For this study 31 cases of international life safety Web DB were collected and analyzed. Customer participation style of Web service was reviewed. And demand survey for crime weakness group like students, and young women was examined. As a results people needed to know the un-safety area in their usual life and their ways; school to home, work to home. While creating the Web DB for domestic life safety, user content according to different economic status and publicity for Web DB proved to be important factors.
A Stability Analysis for Vehicle Impact in U-Channel Segmental Concrete Bridges
Choi, Dong-Ho ; Na, Ho-Sung ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 17~25
This paper studied on stability of the U-channel segmental concrete bridge under vehicle-impact loads. The U-channel bridge has advantages in that it reduces an additional dead load and the edge beams role as a barrier. But it has a dangerous factor which collapses the bridge structure when the edge beams are ruptured. Therefore, it is necessary to verify behaviors of the bridge system under vehicle-impact loads. Static and dynamic vehicle impact simulations were carried out on the basis of AASHTO LRFD design specifications. In case of the static analysis, equivalent static loads specified in the AASHTO codes are loaded on the edge beams and in case of the dynamic analysis, FEM vehicle models are modeled by applying the dynamic test specifications of AASHTO codes. As a result, it is shown that U-channel bridge system has sufficient safety against static and dynamic impact loads specified in the AASHTO LRFD design specifications.
Optimum Design of High-Speed Railway Bridges Considering Bridge-Rail Longitudinal Interaction and Moving Load Effect
Ihm, Yeong-Rok ; Im, Seok-Been ; Park, Kwang-Young ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 27~34
Recently, high-speed railway systems have gained increased interest as a means of environmental friendly transportation, and numerous bridges for high-speed railways have been constructed accordingly. However, bridge design for high-speed railways requires more consideration than conventional railway design because fast-moving trains will lead to significant impact on bridge structures. Thus, this research proposes a revised design considering both bridge-rail longitudinal interaction and dynamic effect of trains to ensure stability of fast travelling trains. To validate the proposed design algorithm, numerical analyses are performed and compared using a constructed 250 m long bridge with 5 spans for a high-speed railway. From the numerical results, the proposed optimum design of high-speed railway bridges exhibits the most economic life-cycle-cost (LCC) when compared with several existing design approaches.
Development of Model Equations for Strength Properties with Age in Concrete Pavement
Yang, Sung-Chul ; Kwon, Su-Ahn ; Lim, Yu-Jin ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 35~43
This study was carried out to find reliable relations between various concrete strength properties which are used as input data in concrete pavement design program. Concretes were made from different sources of coarse grained(granite, limestone and sandstone) and fine grained aggregates such as natural sand, washed sand and crushed sand. From strength test results, model equations were obtained based on the relation between strengths. For each coarse grained aggregate, models for compression-flexural strengths, compression-split tensile strengths, compressive strength-modulus and flexural-split tensile strengths with age were obtained. For concrete mixed with gneiss granite aggregates, concrete strengths were obtained from numerical mean values of concrete strengths mixed with fine grained aggregates. In addition models for concrete split tensile strengths and modulus values were provide by averaging numerically the estimated values obtained from the derived relationship and the experimental values. This is due to more scattered values of split tensile strengths and modulus values than other strength properties. Finally criteria for drying shrinkage strain as well as Poisson's ratio for concrete used in pavement were presented for all mixes with differed coarse grained aggregates.
A Study of Monitoring in Slopes of High Collapse Risk Using Terrestrial LiDAR
Park, Jae-Kook ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 45~52
One of the ways to minimize damage by a slope collapse is to set up preventive measures in advance by measuring displacements in a slope and predicting a collapse. There have been many different technologies developed to predict a collapse with diverse measuring equipment. Especially recently, attempts have been made to utilize terrestrial LiDAR, a high-tech imaging equipment to measure displacements on a scope. Terrestrial LiDAR generates three-dimensional information about an object with millimeter-level accuracy from hundreds of meters away and has been used in an array of fields including restoration of cultural assets, three-dimensional modeling, and making of topographic maps. In recent years, it has been used to measure displacements in structure as well. This study monitored displacements in slopes of high collapse risk with terrestrial LiDAR. As a result, it was able to confirm the applicability of terrestrial LiDAR to the field, and proposed monitoring methods.
The Development and Evaluation of Safety Education Program for Preparing Young Children for Urban Inundation
Ahn, Jae-Hyun ; Sung, Mi-Young ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 53~58
The purpose of this study is to develop and evaluate a safety education program for children in early childhood. The program was developed to enhance young children's disaster preventing ability, especially preparing urban inundation. The program consists of nine 30-minute sessions. 26 4-year-olds (10 boys and 16 girls) participated in this program. The effect of this program was evaluated by preschool children's safety knowledge and problem solving ability for preventing urban inundation. Results showed that there was a significant experimental effect for safety knowledge. Experimental children showed higher scores of safety knowledge than control group. Also there was a significant experimental effect for safety problem solving ability. Experimental children showed higher scores of safety problem solving ability than control group. The results of program evaluation revealed that this program was helpful for preparing young children for urban inundation.
Study on Mathematical Method of Radiation Heat Transfer for Estimating Width of Firebreak in Surface Fire
Kim, Dong-Hyun ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 59~64
Building a firebreak against surface forest fire is a typical indirect suppression method that stops spread of flame by removing surface fuel, such as fallen leaves and bushes. In the sense of fire dynamic, building a firebreak is to set a section which will block thermal energy from igniting on virgin fuel. This study suggests and evaluates a calculation method for width of firebreak against surface fire for variant wind and slope conditions by applying the Point Source Model (PSM) to fallen leaves of Pinus densiflora. Width of firebreak was measured based on the distance the threshold radiant heat igniting Pinus densiflora fallen leaves at the heat flux of
reaches. As a result, at the wind velocity of 0~5 m/s and on the slope of
, the appropriate width of a firebreak was 0.35~0.65 m for the mean flame height and 0.75~1.05 m for the maximum flame height. Accordingly, considering the factor of safety, the most appropriate width of a firebreak is 1.05 m based on the maximum flame height. Additional comparative analyses through experiments and field surveys are deemed necessary to determine appropriate widths of firebreak for different types of surface fuel.
A Study on Wearing Practice of Personal Protective Equipment for Firefighter : Focusing on Gyeongnam Province
Bang, Chang-Hoon ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 65~71
The aim of the study intends to investigate wearing practice of personal protective equipment for firefighter in gyeongnam province and to provide the base data for the safety and health of firefighter. The results of the study are as follows. The overall reliability of fire personal protection equipment has been investigated by 3.19 and an overall improvement in the personal protective equipment is needed. Firefighter showed such a low satisfaction leather fire boots(2.68), glove(2.67) and rubber fire boots(2.59) in personal protective equipment and rubber fire boots(2.75), glove(2.77) and leather fire boots(2.97) has been investigated by the state of the poor. For personal protective equipment, firefighters have been experiencing many difficulties on the fit and weight. To overcome this problem, it is necessary to be designed ergonomically and to develop high-performance, lightweight materials.
Optimum Design of a Simple Slope considering Multi Failure Mode
Kim, Hyun-Ki ; Shin, Min-Ho ; Choi, Chan-Yong ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 73~80
Conventional slope stability analysis is focused on calculating minimum factor of safety or maximum probability of failure. To minimize inherent uncertainty of soil properties and analytical model and to reflect various analytical models and its failure shape in slope stability analysis, slope stability analysis method considering simultaneous failure probability for multi failure mode was proposed. Linear programming recently introduced in system reliability analysis was used for calculation of simultaneous failure probability. System reliability analysis for various analytical models could be executed by this method. Optimum design to determine angle of a simple slope is executed for multi failure mode using linear programming. Because of complex consideration for various failure shapes and modes, it is possible to secure advanced safety by using simultaneous failure probability.
Parameter Estimation of Storage Function Method using Metamodel
Chung, Gun-Hui ; Oh, Jin-A ; Kim, Tae-Gyun ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 81~87
In order to calculate the accurate runoff from a basin, nonlinearity in the relationship between rainfall and runoff has to be considered. Many runoff calculation models assume the linearity in the relationship or are too complicated to be analyzed. Therefore, the storage function method has been used in the prediction of flood because of the simplicity of the model. The storage function method has five parameters with related to the basin and rainfall characteristics which can be estimated by the empirical trial and error method. To optimize these parameters, regression method or optimization techniques such as genetic algorithm have been used, however, it is not easy to optimize them because of the complexity of the method. In this study, the metamodel is proposed to estimate those model parameters. The metamodel is the combination of artificial neural network and genetic algorithm. The model is consisted of two stages. In the first stage, an artificial neural network is constructed using the given rainfall-runoff relationship. In the second stage, the parameters of the storage function method are estimated using genetic algorithm and the trained artificial neural network. The proposed metamodel is applied in the Peong Chang River basin and the results are presented.
Effects of Clime Change on Spatio-Temporal Behavior of Drought Using SAD Analysis
Choi, Chi-Hyun ; Choi, Dae-Gyu ; Kim, Eung-Seock ; Kim, Sang-Dan ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 89~97
In this study, the impact of climate change on the spatio-temporal behavior of extreme drought events is investigated by comparing drought severity-area-duration curves under present and future climate conditions. In our climate-change impact experiments, the future climate is based on two GCMs(CGCM3.1-T63 and CSIRO-MK3.0). As a result, in the case of CGCM3.1-T63 future drought events are similar to the present, but in the case of CSIRO-MK3.0 future drought risk is likely to increase. Such results indicate that a climate change vulnerability assessment for present water resources supply system is urgent.
A Numerical Study on Characteristics of Flow in a Crossroad: Case of Crossroad Connected Symmetrically with Inclined Four Roads
Jeong, Woo-Chang ; Lee, Jin-Woo ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 99~108
In this study, the characteristics of flow within and around a crossroad connected symmetrically with four roads are numerically analyzed by using a two-dimensional well-balanced HLLC finite volume model. As results of simulations and analyses, the numerical model employed in this study describes relatively well the complex water surface in a crossroad according to the conditions of inflow and road slope. Moreover, the predicted temporal and spatial variations of water depths in a crossroad and outflows at two downstream boundaries agree relatively well with laboratory measurements.
Quantification of Storm Direction for a River Basin
Park, Chang-Yeol ; Yoo, Chul-Sang ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 109~117
This study quantified the storm direction for a river basin by applying the von Mises distribution, also determined the representative storm direction. Additionally, the whole procedure was repeated for several storm types such as frontal, typhoon and convective storms for their comparison. From the results derived by analyzing a total of 101 storm events for the Naesung river basin, the von Mises distribution was found to explain the directional characteristics of storms. The representative moving directions derived for three different storm types were significantly different each other, which is coincident with the climate of Korea. The results derived in this study could be helpful to estimate more quantitatively the difference in the runoff response with respect to the moving direction of a storm.
Parameter Estimation of the Storage Function Model: 1. Development of the Universal Model for the Parameter Estimation
Choi, Jong-Nam ; Ahn, Won-Shik ; Kim, Hung-Soo ; Park, Min-Kyu ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 119~130
The universal model for the parameter estimation of the Storage Function Model(SFM) was developed through the applications of the distributed model for various hypothetical watersheds and runoff conditions. The existing parameter estimation equations are based on observations and these equations which are derived from the restricted conditions are not sensitive to the variation of physical characteristics of a watershed. This study developed the universal model for the parameter estimation through the runoff simulations of 35,000 times. As the simulation results, we have known that the lag time is related to the longest stream channel characteristics and the storage coefficient is related to the watershed characteristics.
Parameter Estimation of the Storage Function Model: 2. Applicability of the Universal Model
Choi, Jong-Nam ; Ahn, Won-Shik ; Kim, Hung-Soo ; Park, Min-Kyu ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 131~138
We verified the applicability of the developed universal model for the parameter estimation through the rainfall-runoff analysis at 16 watersheds. The existing parameter estimation equations derived from the restricted conditions sometimes, gave the meaningless results which cannot reflect the watershed characteristics and so have not widely used in the ungaged watershed. The values estimated from the developed universal model showed which are sensitive to variations of watershed characteristics. Wider applicability of SFM in ungaged watersheds is expected with the used of effective rainfall from CN method and the universal model.
A Study on the Stability Analysis of the Bank Revetment at Urban Streams in Flood Times
Kim, Chul ; Park, Nam-Hee ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 139~145
Recently, close-to-nature stream improvement works have been carried out in urban streams, where eco-friendly bank revetment methods have been adopted. These bank revetment methods are vulnerable to be damaged or washed away by floods compared to the traditional methods which use concrete materials. Damage analysis methods on the urban streams by the floods of severe rain storm are presented. The analysis methods are the graph-using method and the grid method, which are derived from the survey results at Gwangju stream. Damage analysis grid which is intersected velocity grid and material strength grid is the highest correlation with the damage survey grid. The biggest damage on the bank revetments have been occurred around the crossing structures. Big damages have also been occurred in the connection of low water revetment and the terrace land, and around the structures in the terrace land of the stream.
An Experimental Study on the Application Method of Infiltration Trench
Jung, Do-Joon ; Ahn, Seung-Sub ; Kim, Yun-Tae ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 147~154
In this study, flood control effects for infiltration trench which is one of runoff reduction facilities were analyzed based on hydraulic experiments. Hydraulic experiments were conducted using 25 cm diameter circular pipe, and water depths for boundary conditions are 5, 10, 15, 20, 25 cm. Infiltration volume, runoff volume, runoff initiation time, final infiltration capacity and final infiltration capacity reached time etc. were measured from infiltration trench hydraulic experiment. We assumed that drainage area of each infiltration trench is
) and calculated CN with area based on those experimental characteristics. In AMC-I condition, the calculated CN with five water depths is 84 for 2% pipe slope, 83 for 5% pipe slope. In AMC-III condition, the calculated CN is 84 for 2% and 5% pipe slope.
Development of a Raster-based Two-dimensional Flood Inundation Model
Lee, Gi-Ha ; Lee, Seung-Soo ; Jung, Kwan-Sue ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 155~163
The past researches on flood inundation simulation mainly focused on development of numerical models based on unstructured mesh networks to improve model performances. However, despite the accurate simulation results, such models are not suitable for real-time flood inundation forecasting due to a huge computational burden in terms of geographic data processing. In addition, even though various types of vector and raster data are available to be compatible with flood inundation models for post-processes such as flood hazard mapping and flood inundation risk analysis, the unstructured mesh-based models are not effective to fully use such information due to data incommensurability. Therefore, this study aims to develop a raster-based two-dimensional inundation model; it guarantees computational efficiency because of direct application of DEM for flood inundation modeling and also has a good compatibility with various types of raster data, compared to a commercial model such as FLUMEN. We applied the model to simulate the BaekSan levee break in the Nam river during a flood period from August 10 to 13, 2002. The simulation results showed a good agreement with the field-surveyed inundation area and were also very similar with results from the FLUMEN. Moreover, the model provided physically-acceptable velocity vectors with respect to inundating and returning flows due to the difference of water level between channel and lowland.
Hydraulic Model Test on Local Scour Protecting around Bridge Piers with TTG Blocks
Park, Hyun-Joo ; Ji, Jhung-Hwan ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 165~174
TTG-blocks are concrete blocks designed to be paved around the bridge piers in order to protect the channel bed from local scour. In this study roughness coefficient of T.T.G- blocks are investigated through the hydraulic model test. And critical safety weight of TTG-blocks is derived in terms of Reynolds number for each individual block and group of linked blocks. Flume experiments show that a performance of TTG-blocks is effective to protect the river channel bed from local scour at bridge piers if it is assessed using with geotextile mat under blocks or designated gravels for filling in holes of blocks.
Experimental Study on Hydraulic Characteristics and Vorticity Interactions of Floating Breakwaters
Yoon, Jae-Seon ; Son, Hyok-Jun ; Chun, Si-Young ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 175~183
In this study, laboratory experiments are conducted to investigate flow-fields around floating breakwaters by using the LDV(Laser Doppler Velocimetry) system. The LDV system is a well-known equipment to measure fluid particle velocities in laboratory experiments. Although the system requires great efforts and enormous time for measurements, it can provide precise velocity fields comparing to other available equipments. Various types of drafts and shapes for breakwaters are employed in laboratory experiments to analyze a relation between flow-fields and vorticity. A series of numerical experiments are also carried out by using a two-dimensional Navier-Stokes equations model. Numerically predicted results are compared with laboratory measurements.
Investigation of odor Release from Combined Sewer
Gil, Kyung-Ik ; Shin, Geon-Cheol ; Im, Ji-Yeol ;
Journal of Korean Society of Hazard Mitigation, volume 10, issue 6, 2010, Pages 185~191
This study investigates the odor from combined sewer in urban areas and major odor-causing facilities. Monitorings are conducted in specific areas that have representative characteristics. In combined sewer in urban areas, the real-time monitorings on sulfur, complex odor and specified odor are conducted. And in major odor-causing facilities, the real-time monitorings on complex odor, specified odor are conducted. Odor from combined sewer in urban area is affected by the changes on floating population and the effluent of the septic tank. Also major odor-causing facilities are largely affected by the effluent of the septic tank. The major odor-causing substances are found to be hydrogen sulfide(
) and methyl mercaptan. To reduce the odor from combined sewer, improvement of effluent from the septic tank and reduction of sulfur compounds have to be done.