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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 8, Issue 6 - Dec 2008
Volume 8, Issue 5 - Oct 2008
Volume 8, Issue 4 - Aug 2008
Volume 8, Issue 3 - Jun 2008
Volume 8, Issue 2 - Apr 2008
Volume 8, Issue 1 - Feb 2008
Selecting the target year
An Experimental Study on the Shear Behavior of Reinforced Concrete Beams Strengthened with Slit Type Steel Plates
Lee, Choon-Ho ; Shim, Jong-Seok ; Kwon, Ki-Hyuk ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 1~8
RC beam of existing structures often encounter shear problems for various reasons. The shear failure of RC beam is sudden and brittle. Strengthening technique jacketing with external bonding of steel plates(or CFRP and CFS) with epoxy is many use to in practice. This study presents test results on strengthening shear deficient RC beams by external bonding of slit type steel plates. Test parameters are width, interval, length, thickness and angle of slit in steel plates. The purpose was to evaluate the reinforcing effects, failure modes and shear capacities for RC beams of strengthened with various slit type steel plates. The test result confirmed that all slit steel plates improved the stiffness and strength of the specimens significantly. Failure modes of SV series and SD series showed shear fractures and flexure fractures at ultimate state respectively. SD series were ductile rather than SV series.
A Study on Method for Deflection Management in FCM Bridge using Sensor Network
Jo, Byung-Wan ; Tea, Ghi-Ho ; Kwon, Oh-Hyuk ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 9~16
Ubiquitous technology is proposed which is used wireless sensor network for deflection management at casting and after casting of FCM bridge. Proposed method are analyzed which are sensor experiment and existing FCM bridge using ubiquitous sensor network. Wireless sensor network enables low-cost sensing of environment. As a results, the field application shows that USN is useful method for structural health monitoring system which long distance away.
A Study on the Cooling Center Manual of Facility and Maintenance for Extreme Heat Disaster
Kim, Jin-Wook ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 17~22
Including heat wave, Climate change caused 150,000 casualty in 2000 and heat waves are meteorological events that pose a serious threat to human health. A heat wave is defined as "a period of abnormally and uncomfortably hot and usually humid weather". There is a need for the prevention of health effects due to weather and climate extremes. This study intends to propose the necessity of Response System to correspond to extreme heat. And this research focused on Cooling Center manual of facility and maintenance for extreme heat disaster. It would be useful to be planned based on community and to be taken a role as an E.O.C.(Emergency Operating Center). As a conclusion elderly watching system and the requirements regional cooling center facility was proposed.
A Study on the Model for Classification of Safety in the Curved Section of Road
Kim, Gyeong-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 23~29
This research proposes two sub-models and one integrated model for the classification of safety in curve section of road, where the fatal-rate is relatively higher in accidents. The first sub-model calculates the accident-rate by safety-index that is based on the road geometries. The second decides the safety of curve section by the speed difference between before and in the curve. Finally, the integrated model of two sub-modules can classify the safety of curve section of road.
A Study on DFS Beneficial for Reduction on Speed and Traffic Accidents (based on school zones in Buchon city)
Lee, Kye-June ; Kim, Gyeong-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 31~38
Under the recent situation that there increase the efforts to facilitate DFS(driver feedback sign) in school zones and children's protection areas caused by severity of traffic impact on children, the current study aims at predictively evaluating how and to what extent the reduced car speed is influential to the reduction of traffic accidents in elementary schools located in Buchon city by analyzing the velocity variation before and after DFS installation including its reduction ratio in traffic accidents as well as related literature survey. It, furthermore, aims at identifying applicable effectiveness in DFS operation for elementary schoolers in Buchon based on the data collected.
Breakaway Fracture Energy(BFE) of Indented Type Bolt for Breakaway Sign Supports
Ko, Man-Gi ; Kim, Kee-Dong ; Jun, Sung-Min ; Sung, Jung-Gon ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 39~45
Breakaway support for small signs of size
using indented tube type bolt of D12 mm with 6 mm inner diameter has been developed and the structural strength of the support system for the wind load was verified through static shear and tension tests. One important value in understanding the dynamic behavior of sign post and impact vehicle is the fracture energy of the sign support. In this study, fracture energy needed to break the sign support was estimated by pendulum test and computer simulation using LS-DYNA program. Support system composed of 3 indented bolts was found to sustain the 43.1 kg
51.2 kg wind load safely. Fracture energy for one indented bolt was measured as 163.3J from the pendulum test, and was calculated as 153J from the LS-DYNA simulation. The closeness between these two values verified the validity of the simulation model.
Calculation Method and Influence Factor for Speed Change of a Vehicle Impacting Small Sign Post
Ko, Man-Gi ; Kim, Kee-Dong ; Jun, Sung-Min ; Sung, Jung-Gon ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 47~52
Important factor in designing a breakaway sign support is the velocity change of the impact vehicle. It is measured from the crash test or can be calculated by 3-D Finite Element Analysis. It can also be calculated with relative ease utilizing energy and momentum conservation. In this paper a formula to calculate the velocity change of a car during the time of impact against a small sign is derived utilizing the energy and momentum balance. Using the formula, parametric studies were conducted to find that impact speed, separation force and Breakaway Fracture Energy(BFE) of the posts which represent the degree of fixedness to the foundation are the important factor to vehicle's speed change. It is shown that speed change is larger in the lower speed impact and to the posts with large separation force and BFE.
Experimental Investigation about Optimum Smoke Extraction System for Underground Station
Lee, Ho-Keun ; Kim, Myoung-Woo ; Lee, Phill-Young ; Kim, Nam-Suk ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 53~59
If fire is occurred in the subway, the train must be moved to the closest station and make passengers get off the train. As a matter of fact, the Fire of Dae-gu Subway was coped with this way. But, the fire smoke extraction system of real subway stations have not designed to deal with fire of trains yet. Therefore, we have to establish a plan of station railroad for preventing from unexpected damage when the fired train comes to the station. The purpose of this study is to establish the effective smoke extraction measure that is to prevent stations from damage by the scale-down experiment.
A Methodology to Quantifying Benefit for Implementing Smart-Pipe to Lifeline Systems
Jun, Hwan-Don ; Kim, Joong-Hoon ; Cho, Moon-Soo ; Baek, Chun-Woo ; Yoo, Do-Guen ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 61~66
As the water distribution system which is one of the critical lifeline system is deteriorated and pipe failures occur frequently, the more efficient pipe monitoring system becomes a critical issue in the water industry. One of the pipe monitoring systems is called "Smart-pipe System" which is permanent, comprehensive and an automated SIM (Structural Integrity Monitoring) system and has superiorities to existing monitoring system. To implement a smart-pipe system on a water distribution system, assessment of its indirect benefit obtaining from smartpipe such as the ratio of preventing water main failures must be preceded. However, only some researches on this field have been performed. In this paper, the concept of smart-pipe system is compared with the current monitoring systems for a water distribution system, and a method to quantify its benefit using the inconvenient time for customers is suggested. The suggested method was applied to a real water distribution system to estimate its applicability and benefit.
A Study on the Influence of Fire Service Budget for Fire Service Force
Kim, Jin-Dong ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 67~74
Because the fire service demands are increasing and forms are diversified, the first thing you must do is to make up the fire service budget to keep fire service power sufficiently. Such budget allocation leads to supply enough fire service people want and results in social welfare satisfaction. If the budget of fire service is not enough to meet with its power, sufficient security of the fire fighters would be impossible. Also, when the urgent disasters occur, the government cannot cope with them effectively. In fact, loss of many lives and properties took place in some cities and kuns because of that. The purpose of this study is to investigate the influence of fire service budget for fire service force. To do this, this study reviews fire service budget, fire service force. And this study sets up three hypotheses based on the theoretical backgrounds and the past research. The statistical method used for the verification of hypotheses is multiple regression analysis. The analysis showed that fire service budget per head variable was positive significant, fire service budget ratio variable was not significant. Also, public facilities tax variable was negative significant. Therefore, the analysis showed that public facilities tax couldn't fill the role as a earmarked tax.
Spread Speed of Forest Fire based on Slope
An, Sang-Hyun ; Shin, Young-Chun ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 75~79
As Information Technology developed, Information requirement has been went higher. In the field of GIS(Geographic Information System) more information is processed more quickly and accurately. Especially, quick analysis of forest fire information (topography, ignition point, weather condition, etc.) over a wide area is essential in order to minimize victim, environmental damage, and economical damage, decide course of evacuating, estimate a fire spread course, and attack resource arrangement. We determined a fire spread distance at each unit time through an experiment with various slope degrees and distinction of flat, upslope and downslope. For the tests on the upslope, as the slope increased, the rate of spread increased. On the downslope in contrast with the upslope, as the slope increased, the rate of spread decreased. We analyzed a spread rate of forest fire on each slope as the method classified upslope(+) and downslope(-) using the results obtained from the experiment. Consequently, the proposed method is able to be used to effectively support the attack of forest fire by providing accurate predictions of fire spread.
A Study of Stability Analysis for Exit Light
Jung, Jong-Jin ; SaKong, Seong-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 81~85
In this study, Standards of Lighting Appliance and Standard of Model Approval and Inspection Technology for EXIT LIGHT are compared so as to analyze stability of a exit light which is fire product. Test items, which are not included in Standard of Model approval and Inspection Technology for EXIT LIGHT, are deduced from aforementioned comparison and analysis. Also the derived test items are experimented with a exit light. For a power factor correction, a power factor correction circuit is designed and power factor, crest factor, asymmetry ratio, luminance variation are analyzed. In order to show the validity of designed circuit, current waveform and voltage waveform are measured.
A Study on the Improvement of Anti-Fire System of Temples
Kong, Ha-Sung ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 87~90
This research is to study and analyze our country's management of disasters, the present condition of cultural heritages bases on the examples of temples, and Japan's safety management prevention of buddhist temple. As a result, this research aims to how to improve the temple fire prevention system. To improve the anti-fire system of temples, it is important to make new laws about fire lose to minimize cultural property lose. Secondly, to protect self-contained type fire alarm device, with aerosol type hand propelled fire extinguishers to prevent fire lose. Lastly, construction work of electric engineer is necessary to prevent temple fire loses.
Development of a Numerical Model of Shallow-Water Flow using Cut-cell System
Kim, Hyung-Jun ; Lee, Seung-Oh ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 91~100
Numerical implementation with a Cartesian cut-cell method is conducted in this study. A Cartesian cut-cell method is an easy and efficient mesh generation methodology for complex geometries. In this method, a background Cartesian grid is employed for most of computational domain and a cut-cell grid is applied for the peculiar grids where the flow characteristics are changed such as solid boundary to enhance the accuracy, applicability and efficiency. Accurate representation of complex geometries can be obtained by using the cut-cell method. The cut-cell grids are constructed with irregular meshes which have various shape and size. Therefore, the finite volume method is applied to numerical discretization on a irregular domain. The HLLC approximate Riemann solver, a Godunov-type finite volume method, is employed to discretize the advection terms in the governing equations. The weighted average flux method applied on the Cartesian cut cell grid for stabilization of the numerical results. To validate the numerical model using the Cartesian cut-cell grids, the model is applied to the rectangular tank problem of which the exact solutions exist. As a comparison of numerical results with the analytical solutions, the numerical scheme well represents flow characteristics such as free surface elevation and velocities in x-and y-directions in a rectangular tank with the Cartesian and cut-cell grids.
A Study on Warnning Criteria Investigation of Automated Rainfall Warning System -Focused on Realationship of Water Level, Discharge and Precipitation -
Ahn, Jae-Chan ; Lee, Jong-Seol ; Chol, Woo-Chung ; Lee, Byong-Ju ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 101~109
Automated rainfall warning system is a facility to prevent casualties who were recreating in the down stream region with operating lead broadcasting or signaling warning automatically when torrential rainfall occurs in mountainous area. But standard of conventional warning does not consider the characteristics of basin, and warning signal. Evacuation signal 1 and evacuation signal 2 are uniformly signaled when the 10minute moving total of observed rainfall is higher than 4 mm, 6 mm, and 8 mm respectively. therefore, local governments and relative agencies had re-established the standard of warning by analyzing the risk water level, critical discharge and reference rainfall, which are considering the characteristics of basin. In this study the standard of conventional and re-established warning of weolseong basin, which is available to acquire a real rainfall. There are analyzed by considering the risk water level, critcal discharge and reference rainfall. Also this study compares rainfall of conventional and re-established warning standard and indentifies problems by analyzing adequacy of rainfall estimation for warning and proposes alternative. The standard of conventional warning which investigates with the converted rainfall(unit of a minute) issued too many alarm. The re-established standard upward has the necessity which will be regulated about the alarm announcement number of times. Considers the safety, upward regulation of alarm standard rainfall is a necessity which will be prudent.
Efficiency of Riparian Buffer Zone on Removing Sediment Yield Using SWAT Model
Choi, Dae-Gyu ; Park, Moo-Jong ; Kim, Jae-Chul ; Kim, Sang-Dan ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 111~118
Riparian buffer zone prevents sediment entry into drainage channels or as a protection from runoff and wind erosion. However, Studies about its removing effect according to Riparian buffer zone are shorted now. In this study, using the SWAT model, Byongseong watershed is built on the Arcview GIS. Using the function of the filter strip in SWAT model, it is also examined about the variation of sediment yield. As a simulation result, the case of constructing riparian buffer zones at subbasins near the outlet shows generally high efficiency on removing sediment yield. In addition, according to the scenario analysis of changing riparian buffer zone width, it is thought that 5-10m riparian buffer zone width is the highest efficiency on removing sediment yields generated from Byeongseong watershed.
Determination of Pollutant EMCs and Loadings of Runoff in Paved Areas
Gil, Kyung-Ik ; Wee, Seung-Kyung ; Park, Moo-Jong ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 119~122
The paved area like a road or bridge where having high impermeable rates were accumulated various non-point sources(NPS) by passing vehicles during dry season periods. They are flowed in the river continuous when it rains and could negative impact on environment. Therefore, this study monitoring NPS for two years and determinating for each pollutant EMCs and mass loading. The result shows that the EMC ranges are 11.60
230.90 mg/L for TSS, 4.58
31.90 mg/L for BOD, 1.86
9.20 mg/L for TN and 0.14
1.55 mg/L for TP. Also, the ranges of washed-off mass loading are determined to 0.78
18.01 kg/day for TSS, 0.47
1.17 kg/day for BOD, 0.00
0.01 kg/day for Pb and 0.01
0.06 kg/day for Zn.
Evaluation of Stream Flow Data Observed in the Pyungchang River Basin Using the IHACRES Model
Park, Yong-Hee ; Yoo, Chul-Sang ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 123~133
This study evaluated the runoff data collected at 12 stream gauge stations of the Chungjoo dam basin using the IHACRES model. Especially, the geomorphology-related parameters of the IHACRES model could be quantified base on the regionalization technique, which have also been applied many stream gauge stations of the Chungjoo dam basin. Summarizing the results is as follows. (1) The climate-related parameters of the IHACRES model c,
, and f are found to be estimated and used uniformly over the basin. (2) The geomorphology-related parameters of the IHACRES model
are found to be estimated by considering the geomorphological parameters like the basin area, channel length, channel slope, basin slope through the regionalization based on the regression analysis. (3) Using the climate-related parameters applied uniformly over the basin and the geomorphology-related parameters estimated based on the regionalization procedure for each stream gauge station, a total of 12 stream gauge stations have been evaluated with their stream flow measurements. As results, the Sanganmi and Youngwal 1 stream gauge stations have been found to make high quality flow data, but Youngwal, Baekokpo, and Panwoon stations low quality flow data. On the whole, 12 stream gauge stations considered show large differences with their data quality, so a plan for securing more consistent data quality should be prepared imminently.
Prediction of Coastal Inundation due to Tsunamis : Pohang New Port
Sim, Ju-Yeol ; Ha, Tae-Min ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 135~143
During the last decades several devastating tsunamis have been occurred. Recently, there have been increasingly concerned about tsunamis around the Korean Peninsula since the 2004 Sumatra Tsunami occurred on December 26, 2004. In general, the Korean Peninsula is not safe against potential tsunami attacks. The 1983 Central East Sea Tsunami and the 1993 Hokkaido Tsunami caused considerable damage to the Eastern Part of the Peninsula. Thus, a prediction of damage due to tsunamis must be required at the Eastern Part of the Peninsula. In this study, numerical simulation of tsunamis at Pohang New Port, one of the most important ports in the Eastern Part of Korea, is conducted for three different tsunami events. Numerical simulation is focused on inundation on the port and run-down around an intake structure which supplies cooling water to the porthinterland. The computed results show that Pohang New Port is damaged by the most dangerous tsunami which can be generated in the East Sea. Thus, it is required to set up a counter-measure against tsunami attacks at Pohang New Port.
Application of Practical Dispersion-Correction Scheme for Simulation of Tsunami Propagation
Choi, Moon-Kyu ; Ha, Tae-Min ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 8, issue 4, 2008, Pages 145~152
The initial wave lengths of tsunamis can be several tens to hundreds kilometers. Thus, the importance of the frequency dispersive effects in proportion to variation of the wave length, and should be properly considered in numerical simulation of tsunami propagation for a better accuracy. Recently, a practical dispersion-correction scheme has been developed by adding dispersion-correction terms(Cho et al., 2007). The new model employing the numerical technique has been verified by comparing numerical results with available analytic solutions, however, the new model has not yet been applied on a real topography. In this study, the new model is applied on a real topography and its applicability is examined. To study the applicability of the new model, two historical tsunami events are simulated for Sokcho, Mukho and Pohang harbors, with the tide gage records. Numerical results, the arrival time and the maximum water level at the tidal stations, are compared with observed data at each harbor.