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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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
Evaluation on Structural Performance of Hybrid Friction Damper Components II: a Slotted Bolted Frictional Connection
Kim, Dohyun ; Kim, Jiyoung ; Lee, Kihak ; Hwang, Sungho ; Baek, Kihyun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 1~8
DOI : 10.9798/KOSHAM.2014.14.5.1
The hybrid damper, which is composed of two one-nodal rotary frictional components and a slotted bolted frictional component, is able to operate at various displacements of building. As the second part of component test series of hybrid friction damper, this paper investigate the mechanism and dependency performance of a slotted bolted friction component. Test results show that the multi-slip mechanism is verified and friction forces slightly increase with displacement amplitudes. However test specimens do not depend on a forcing frequency and a long term loading.
Performance Evaluation for Steel Wire-Integrated Deck Plate according to Location of Lattice End
Kim, Sung Bae ; Kang, Min Joung ; Hwangbo, Chan ; Kim, Sang Seup ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 9~18
DOI : 10.9798/KOSHAM.2014.14.5.9
Recently, for the decreased work term and the convenience of construction work, the steel wire-integrated deck plate has been widely used in practice. Generally, in steel wire-integrated deck plate, lattice end is welded with upper deformed bar, therefore, only galvanized sheet iron bears the shear force without the vertical bar. But the galvanized sheet iron isn`t strong enough, so the lattice end is shifted onto the top of the steel beam. Therefore, tests have been conducted on 24 specimens with several experiment variables to evaluate the structural safety of the proposed deck plate system during the construction step. The test results show that the lattice end on the steel beam effectively deals with the shear force.
Developing Heat Flux Evaluation and Fire Risk Map for Forest Fires in Yangdong Villages
Lee, Ji-Hee ; Kim, Dong-Hyun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 19~25
DOI : 10.9798/KOSHAM.2014.14.5.19
Yangdong Village in Gyeongju was registered as a World Heritage site in 2010, along with Hahoe Village in Andong. Most houses in Yangdong Village are timber framed houses with thatched roofs that are not fire resistant; they are thus exposed to the risk of fires. It is especially the case because they are near forests and could be affected by forest fires. The study examined the effect of the heat flux on the houses in Yangdong Village as a result of forest fires to evaluate to what degree of risk they are exposed to. After distinguished the tree species of major structural components of wooden buildings. This was done by getting the precise location information on the houses in Yangdong Village with the GIS analysis, collating the information on the construction materials and conducting the numerical analysis on heat flux in case of forest fires. The results showed as follows: around 10% of the houses are directly exposed to the danger of forest fires and 5% of all the houses are expected to be subject to the indirect effects due to the proliferation of the initial forest fires. In conclusion, it was determined that appropriate and effective methods of forest fire prevention and fighting need to be sought, and they should be based on eliminating the possible fuels for forest fires that are nearby the fire-vulnerable houses, securing enough separation distances and installing waterproof facilities.
Research on the Guidelines of School Facilities as Urban Disaster Relief Centers
Nam, Jee-Hyun ; Hwang, Young-Sam ; Park, Mi-Jin ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 27~41
DOI : 10.9798/KOSHAM.2014.14.5.27
This research is the preliminary research on the architectural planning of schools as urban disaster relief centers preparing for urban disaster. We investigated the disaster prevention policy of Japan and the guidelines for planning schools as shelters through reports and research papers from the Japanese government and national research center. The space required for an urban disaster relief center is minimized by a gradual evacuation according to refuge activities and actions. As a result, we defined a strategy to establish a disaster relief center according to the incremental stages of refuge activities: life-saving period, life-secured period, and living support period. Also, three different support-function zones (the multiple-purpose open space zone, additional temporary facility zone, multiple-purpose classroom zone) were defined in addition to the auditorium, which is the main refuge space of school. Like this, the stages must be taken into consideration for designing the school as an urban refuge and the activities could be an important clue to be able to classify the facilities demanded supporting schools as relief centers.
Experimental Performance Tests of Magnetic-frictional Dampers to Embody a Smart Damper
Choi, Eunsoo ; Choi, Gyuchan ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 43~48
DOI : 10.9798/KOSHAM.2014.14.5.43
This study suggests a method to embody a smart damper using magnetic friction and rubber springs. In this study, energy dissipation capacity of permanent magnets with and without contacting on a magnetic substance. Non-contacting method uses reaction from magnetic induction, and contacting method uses friction; the contacting method is superior to dissipate energy. After manufacturing a magnetic-frictional damper, this study conducts dynamic loading tests and investigates the characteristics of the damper. The magnetic-frictional damper shows the same frictional behavior with other types of friction and frictional coefficient of the damper does not vary so much with increasing loading frequency. A precompressive rubber spring shows rigid-elastic behavior and presents a flag-shaped behavior combining with magnetic friction, which can a smart damper.
Dynamic Amplification of Tied-Arch Girder due to Variations of Rise Ratio and Vehicle Moving Speed
Hong, Sanghyun ; Lee, Jong Seh ; Park, Kyung-Hoon ; Roh, Hwasung ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 49~55
DOI : 10.9798/KOSHAM.2014.14.5.49
In this paper the effect of rise ratio on the dynamic amplification (DA) of the tied-arch girder is investigated through a finite element analysis. Equivalent nodal loads are considered for the modeling of moving vehicle loads, and several vehicle speeds ranged between 60 km/hr and 120 km/hr are applied for the DA investigation. For detailed investigation, the relationship between the first mode frequency of the girder and the DA at the middle of the girder is investigated. The results show that the DA of the girder sensitively varies according to the rise ratio; especially when the rise ratio is more than 0.03, the maximum DA is relatively larger than the cases of the smaller rise ratio. Such result is appeared since the girder becomes more flexible and the developing time of the maximum DA is close to the first natural period of the girder.
Case Study of the Hydrometeor Classification with the S-band Dual-Polarization Radar
Lee, Jae-Kyoung ; Kim, Hea-Lim ; Kim, Ji-Hyeon ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 57~66
DOI : 10.9798/KOSHAM.2014.14.5.57
The hydroemeteors can be classified by some categories using variables (i.e. reflectivity, differential reflectivity, differential phase, specific differential phase) from the dual-polarization radar and the forecast skill for the extreme weather events will be improved using the hydrometeor classification. Therefore, this study reviewed the fuzzy-logic algorithm of hydrometeor classification that was applied to the system of the S-band dual-polarization radar in Bislsan as work-site operations and verified the hydrometeor classification system using 17 case studies and 40 concentrated case studies for the surrounding areas of Bislsan dual-polarization radar. As the results, even in the case of mixed snow and rain, the hydrometeor classification system can classify weather cases by rain, snow, hail, etc. Especially, the hydrometeor classification system is capable of categorizing the cases as meteorological echoes as well as non-meteorological echoes (i.e. bright band, chaff) with the proper use of dual-polarization variables. Therefore, the fuzzy-logic algorithm for the Bislan S-band dual-polarization radar is effective to classify the hydrometeors by some meteorological categories.
Differentiating Scheme for the Storm Warning Criteria Considering the Regional Disaster Prevention Capacity
Park, SangSik ; Kang, BooSik ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 67~76
DOI : 10.9798/KOSHAM.2014.14.5.67
Recently, the increased high-risk weather events have caused more frequent threats of natural disasters, e.g. inundations, floods, land slides and infrastructure damages. In addition even equivalent strength of severe weather events could result in varied physical damages and associated economic losses. In this study, the natural disaster Hazard Index (H-Index) was developed for evaluating regional disaster prevention capacity consisting of 10 detail indices, e.g. provision of sewage network, river improvement ratio, impervious area ration, etc., classified by vulnerability and risk categories. The weights for the H-index components were estimated using questionnaire survey and entropy scheme. The final differentiating framework for regional storm warning criteria was suggested considering Antecedent soil Moisture Condition (AMC) and differentiation coefficients associated with regionally varied reference storm scales.
Development of Prediction Method Considering Geometrical Amplification Characteristics of Slope I : Analysis about Amplification Characteristics of Mountain Slopes in Seoul
Park, Duhee ; Lee, Jonghoo ; Ahn, Jae-Kwang ; Han, Jin-Tae ; Lee, Joonyong ; Park, Inn-Joon ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 77~84
DOI : 10.9798/KOSHAM.2014.14.5.77
Research on seismic mountain slope stability hazard map is widely being pursued in order to reduce the hazard induced by earthquakes. The hazard maps use the Newmark sliding block analysis, which in turn uses the peak ground acceleration estimated from the seismic design code. The seismic coefficients are developed to represent the amplification characteristics of horizontally layered soil profiles. However, it is not appropriate to apply such coefficients considering that typical mountain slopes in Korea have inclined bedrock parallel to the slope surface, and the soil layer thinly covers the slope. In this study, a series of nonlinear dynamic analyses are performed to derive the amplification factors of mountain slopes in Seoul. The amplification factors are calculated from the normal and shear stresses acting on the failure surface, from which the equivalent acceleration time history is derived. The calculated amplification factors are shown to be approximately 30% lower than the seismic coefficients of horizontally layered soil profiles. It is therefore concluded that use of the seismic coefficients given in the seismic code will result in very conservative estimate of the ground motion, and that use of the recommended factors are more realistic. The factors derived in this paper are used to develop slope hazard maps in the companion paper.
Development of Prediction Method Considering Geometrical Amplification Characteristics of Slope II: Construction of Landslide Hazard Map during Earthquakes in Seoul
Lee, Joonyong ; Han, Jin-Tae ; Baek, Yong ; Park, Duhee ; Lee, Jonghoo ; Park, Inn-Joon ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 85~92
DOI : 10.9798/KOSHAM.2014.14.5.85
Seismically triggered landslides are one of the most damaging hazards associated with earthquakes, especially in Korea including many mountain areas. They can not only cause the damage to lives and structures directly, but also cease the operation of the whole social systems by making the roads and/or lifelines useless. Therefore, the systematic research on factors affecting the slope stability for earthquake and evaluation method of slope stability considering earthquake induced factors should be needed. In this paper, in order to visualize the hazard of the landslide by earthquakes, study area is selected for a mountain of Seoul, and hazard maps using GIS have been used. The displacement by earthquake is evaluated by Newmarkís method and the factor of safety is calculated based on the concept of the limit equilibrium method and pseudo-static analysis by using amplification factor obtained from geometrical characteristics of slope.
Shear Displacement Measurement of Rock Slope using Coaxial Cable and Time Domain Reflectometry
Kim, Dae Sung ; Yoo, Ji Hyeung ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 93~99
DOI : 10.9798/KOSHAM.2014.14.5.93
Through experiment using coaxial cable and Time Domain Reflectometry(TDR), the changes in relative voltage according to the shearing displacement were analyzed to derive correlation between the shearing displacement and relative voltage difference. As the result, it is found that relationship of shear displacements and relative voltage difference is polynomial. Also, TDR method was applied to real slope to measure the elapsed time, and shear failure zone of real slope through ground investigation data and those measured in the field was compared and analyzed. To measure the change of slope behavior, TDR method and inclinometer were installed. As a result, similar displacement to that of inclinometer could be measured using TDR method. In case of inclinometer, it was difficult to find accurate point of displacement while using TDR method, accurate displacement point could be found.
Field Water Content and Dry Density Measurement Using Time Domain Reflectometry
Kim, Dae Sung ; Yoo, Ji Hyeung ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 101~108
DOI : 10.9798/KOSHAM.2014.14.5.101
For Time Domain Refectometry (TDR) which is being utilized in ground measurement field recently, TDR probe was made to measure water content and density of the in-site grounds. Laboratory experiments were conducted for 3 type soils; Jumunjin sands, weathered granite soils, and typical subgrade soils. Through laboratory experiments, the signal changes of TDR according to the changes of density and water content of soils were measured. By analyzing the measured signals, the TDR parameters of each soil were drawn out. And TDR probe was verified through calculation of water content and density using the parameters and TDR signals from laboratory experiments. For the application to the field, in-site experiments were conducted based on the laboratory experiments. And then test results were compared with those by the conventional field density test, the sand cone test. Through the results of the study, it can be concluded that a new approach using TDR for water content and density measurement of the in-site ground was more convenient, drew out the outcomes faster and the error by experimenters can be reduced dramatically.
Characteristerization of Biopolymer Solution Used for Soil Remediation and Petroleum Production
Jung, Jong-Won ; Cao, Shuang ; Ahn, Jaehun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 109~114
DOI : 10.9798/KOSHAM.2014.14.5.109
Biopolymers are one of environment-friendly materials that can be completely degraded by microbes, not like other chemical products. It is more effective to saturate the pore of soils by biopolymer solutions than by water, and therefore biopolymers are used for soil remediation and petroleum production. Two types of biopolymers, alginic acid sodium salt (SA) and polyethylene oxide (PEO), are employed in this study to experimentally investigate the basic properties - contact angle, surface tension, viscous force - and flow characteristics of biopolymer solutions using microfludic device. It was found that the contact angles of biopolymer solutions on a silicon dioxide plate were lager than that of water. The magnitudes of surface tensions of biopolymer solutions did not show a clear trend. The viscous force of biopolymer solutions were larger than that of water, and it increased with increasing concentration of solutions. The tests with a microfluidic device showed that the pore is better saturated by the biopolymer solutions with more concentration and more injection velocity. The results of this study provides basic properties of biopolymer solutions for flow analysis, and can be referenced for effective soil remediation and petroleum production usingn biopolymer solutions.
Landslide Susceptibility as a Function of Fluctuating Groundwater Levels and Seismic Loading
Chung, Jae-Won ; Rogers, J. David ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 115~121
DOI : 10.9798/KOSHAM.2014.14.5.115
This paper presents a method to assess seismically-induced landslides with fluctuating groundwater levels. We note that heavy rainfall elevates the groundwater levels and significantly undermines slope stability. Groundwater depths sufficient to trigger seismic landslides were computed with back-calculation as well. Compared with the real-time water depths, the threshold water depths can be applied to assess the relative impacts and cost-benefits of mitigating slope instability through selected employment of dewatering measures, such as well, hydraugers, and subdrains. Numerous seismically-induced landslides in loess deposits were identified along the Mississippi River bluffs near Chester, IL, USA, which are believed to have been triggered by the New Madrid earthquakes of 1811-1812. We employed Newmark`s model to evaluate slope stability using the ground motions enhanced by site effects for a
earthquake. Given a scenario earthquake, Arias intensity in this area was estimated from 0.59 to 2.8 m/s. Our results suggest that these seismically-induced landslides along the river bluffs would be extensively reactivated (Newmark displacement
) during the rainy season (groundwater depth
Estimation of Crack Density of Rock by Using Elastic Wave Velocity
Byun, Ji-Hwan ; Kim, Youngseok ; Hong, Seungseo ; Yoon, Hyung-Koo ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 123~131
DOI : 10.9798/KOSHAM.2014.14.5.123
The stability of structures constructed on the rock has been estimated by porosity without the consideration of crack existed in rock. The objective of this study is to suggest the method for estimating the crack density, which can represent the characterization of crack, by using the elastic wave velocity. The Biot-Gassmann model is adopted for developing the equation in terms of crack density. The specimen is extracted in the field and the specimen is abraded into the shape of cylinder for increasing the efficiency of measuring elastic wave velocity. The each transducer for compressional wave and shear wave is applied to obtain the profile of elastic wave. The porosity is first estimated before calculating the crack density of specimen. The calculated crack density shows the similar trend with data performed by previous study. Furthermore, the crack porosity is also estimated through the equation and thus, the suggested method may be widely applied to assess the stability of rock structures.
Physical Vulnerability Function of Buildings Impacted by Debris Flow
Kang, Hyo-Sub ; Kim, Yun-Tae ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 133~143
DOI : 10.9798/KOSHAM.2014.14.5.133
The physical characteristics of debris flows were analyzed from a total of 8 cases of debris flow disasters occurred in between July and August, 2011. 15 buildings damaged in these events were also investigated in detail to study the characteristics and patterns of building damages by debris flows. Physical vulnerability was obtained from the relationship of the degree of building damage and the physical characteristics of debris flow. Three different empirical vulnerability curves were obtained, which were functions of debris flow height, flow velocity and impact pressure, respectively. Furthermore, the vulnerability function was characterized according to the structural types of the building. In the case of non-concrete building, a complete destruction occurred at the impact pressure of more than 30 kPa, an extensive damage at the impact pressure between 15 and 30 kPa, a slight damage at the impact pressure below 15 kPa. In the case of reinforced-concrete buildings, an extensive damage occurred at the impact pressure of more than 100 kPa, a moderate damage at the impact pressure between 35 and 100 kPa, a slight damage at the impact pressure below 35 kPa. The impact pressure of debris flow corresponding to a slight damage to the reinforced-concrete building produced a complete damage for the case of non-concrete building, Nonlinear regression analysis was performed according to the physical characteristics of debris flow and the building structural type. The proposed physical vulnerability curves could be used as a quantitative assessment of the structural resistance of buildings affected by a debris flow event.
A Development of Cold-Mix Asphalt for Pothole Patching Material Using Urethane Modified Asphalt Binder
Park, Kisun ; Cho, Myunghwan ; Kim, Jangsub ; Kim, Nakseok ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 145~151
DOI : 10.9798/KOSHAM.2014.14.5.145
Roads have been frequently damaged due to the increase in heavy weight vehicles. It is important to study on the patching material for asphalt pavements because damaged roads is an issue that is directly related to human life. This study was conducted to develop an urethane modified asphalt binder available at room temperature. In addition, the possibilities of its utilization as an asphalt pothole patching material were estimated. The segregation, storage stability and viscosity tests were performed to confirm the stability of urethane modified asphalt mixture. Test results showed that more than 30 percent of process oil needs to be contained within urethane modified asphalt binder to meet the stability requirement. Urethane Modified Asphalt Mixture is more excellent Rutting Resistance and Indirect Tensile Strength than those of the conventional hot mix asphalt mixture. The loss energy analysis conducted for the test bed presented that load distribution and fatigue crack resistance were also noticeable compare to those of conventional.
The Analysis of Effects on Topographical Model for 2D Inundation Simulation
Son, Ahlong ; Yoon, Seongsim ; Yi, Chaeyeon ; Lee, Byungjoo ; Choi, Youngjean ; Han, Kunyeun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 153~163
DOI : 10.9798/KOSHAM.2014.14.5.153
In this study, 2-dimensional inundation analysis of flow aspect, inundation area, averaged inundation depth, maximum inundation depth was implemented according to application of topographical data in urban area where the population and buildings are concentrated. In terms of building topographical data, there are several methods: DSM(Digital Surface Method) constructed around big city using LiDAR survey, digital map drawn on a scale of 1 to 1,000 and combination of DEM(Digital Elevation Method) removed building, plants and trees and digital map. Also, the topographical data generated on the basis of above-mentioned methods were converted other topographical data at resolution of 4m, 8m and 16m. The inundation caused by the localized heavy rain event on Sep. 21th, 2010 was analyzed in and around samsung drainage flooded at that time by each resolution. The results of inundation analysis was expected to suggest optimal method for building topographical data and resolution in order to exactly and effectively analyze inundation. Consequentially, in case of applying for generated topographical data by combining DEM and digital map data and higher than 4m resolution, the superior result was shown.
A Preliminary Study on the Responses of South Korea according to the Occurrence of Disasters in North Korea
Shin, Ho-Joon ; Beak, Min-Ho ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 165~171
DOI : 10.9798/KOSHAM.2014.14.5.165
In this study, the concept and occurrence characteristics of disasters in North Korea were examined in the aspect of joint disaster countermeasures, not as the ideological approach. Also, the disaster management system of North Korea and the disaster response and support status of South Korea were examined and the measures to develop the responses of South Korea were presented. In conclusion, it is necessary to establish the roles of response organization system of South Korea first in preparation for the occurrence of disaster in North Korea. Based on the established roles, the response and support process model should be established, and the support manual in consideration of damage status of North Korea should be developed. Also, the cooperative system with international organizations should be established so that correct information could be shared and disaster relief supplies could be delivered cooperatively in the right place at the right time.
A Study on the Assessment and Improvement of the Heritage`s Disaster Risk
Cho, Hong Seok ; Seo, Hyeon Jeong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 173~187
DOI : 10.9798/KOSHAM.2014.14.5.173
This study is Gyeongsangbuk-do in government-designated heritage in the disaster management aspects and the types of disasters, organizing and analyzing items and risk assessments, by reviewing individual cultural assets of disaster management issues and ways to improve disaster for more effective prevention and countermeasures are proposed. Composition of the specific type of cultural property, subject to the cultural and natural heritage, and separated by the mobility separated from each real estate cultural heritage and the garden as a cultural asset, allowing for ease of evacuation in a disaster situation and to determine the degree theft by classified cultural property surveyed the types of disasters that can have a major disaster situation, while considering were classified into six different types(fire, storm or flood, earthquake, lightning, insects, theft and tampering). And significant influence factors that can affect the cultural property, which causes the external factors(threats) and internal factors(vulnerable factors) divided by each step disaster(disaster causes, types of disasters, disaster, depending on the damage) that can affect the strengths(complementary elements) and weaknesses(risks) for detailed regulations and checks and measures to improve the status on this basis, are derived.
Local Hazard Mitigation Plan (LHMP) is Properly Working?: Evaluation for the LHMP of Kumamoto City
Kim, Hwayoung ; Kakimoto, Ryuji ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 189~198
DOI : 10.9798/KOSHAM.2014.14.5.189
A local hazard mitigation plan (LHMP) or emergency plan is one of the most effective contributions for the mitigation of future local natural disasters. Since different regions are vulnerable to different natural disasters, each community should prepare their own plan based on their specific conditions. In Kumamoto, chronic flood damage and landslides are the most common hazards. In 2012, rapid heavy rain resulted in substantial property damage, casualties, and even fatalities. Therefore, this paper presents the comparison research for Kumamoto hazard mitigation planning around 10-year time series, a longitudinal study. We used a flood mitigation plan coding protocol to better understand the Kumamoto City hazard mitigation plan. Indicators used in the study mostly focus on situations that the city has recently faced. Ultimately, the purpose of this research is twofold: 1) to assess the current mitigation efforts for a local flood event through a comparison study, and 2) to improve the LHMP more practically. Eventually, through this study, it should be possible to enable the local government of Kumamoto to help establish a community resilient to its chronic natural disasters. Specific goals include determining which parts in the LHMP should be reinforced and whether improving the community resilience to flooding is possible.
The Study for Ground Liquefaction Hazard Mapping with Simple Estimating Method
Jin, Yeng-Ji ; Park, Ki-Jong ; Song, Byung-Woong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 199~204
DOI : 10.9798/KOSHAM.2014.14.5.199
When generating rapid dynamic loading like earthquake, the resistance of ground decreases, and it largely effects the stability of structure. Various researchers in Korea have tried to conduct study about the liquefaction hazard map. However there is no case of liquefaction damages caused by earthquake in Korea. Also researchers have difficulties in evaluating liquefaction due to the lack of ground parameters. Therefore this research evaluated the risk of liquefaction for special area through a small quantity of soil material properties like a weight of unit volume, Fc, soil type, N value, ground water level. The risk of liquefaction in research among simple evaluation of liquefaction was evaluated by PL(Potential index of Liquefaction) value which can represent in-site zone, and shown as a detailed hazard map of liquefaction using IDW(Inverse Distance Weighted) method.
The Analysis on Moisture Contents of Forest Fuel Using Weather Factors in Forest Land and Weather Station
Chae, Hee Mun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 205~212
DOI : 10.9798/KOSHAM.2014.14.5.205
The moisture contents of forest fuel are very important roles in behavior and ignition of forest fire. Fuel moisture contents are determined by various weather factors around forest fuel, therefore research on the relationship between the change of fuel moisture contents and weather should be carried. This study was conducted to analysis on the change of forest fuel moisture contents by weather factors into forest land during forest fire danger seasons(spring and fall) at chuncheon area of Gangwon in 2013 year. The leaves of Quercus dentata Thunb. ex Murray, and needles of Pinus densiflora Siebold & Zucc. that drop in the forest land were used to analysis on forest fuel moisture contents. The moisture contents of forest fuel were measured daily during forest fire danger seasons. Weather recording device(HOBO data logger) was installed in forest land in order to analyze the change of fuel moisture contents within the forest land by weather factors. Meteorological data obtained in the forest and meteorological data of chuncheon weather station were analyzed. Among the results of correlation analysis on fuel moisture contents and meteorological data of forest land and weather station, the maximum temperature(
) and relative humidity(%) were significant during the forest fire danger season(spring and fall) in the meteorological data of forest land and only the maximum temperature(
) was significant during the spring forest fire danger season in meteorological data of weather station. The fuel moisture contents of forest fuel after precipitation during forest fire danger seasons(spring and fall) were decreased sharply within 20~30% in one or two day after rainfall.
A Numerical Analysis For The Fire and Smoke Spread Study in the Small Compartment Space
Kweon, Oh Sang ; Chae, Seung Un ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 213~218
DOI : 10.9798/KOSHAM.2014.14.5.213
In multi purpose use facilities, there are a large number of people occupied in a small compartment space. The fire in the multi purpose use facility can be occurred human loss and property damage due to spread of a fire and a smoke in buildings. It is most critical to control flame spread in the early stage. To make the model work for practical fire protection engineering problems, property of combustible materials were predicted so that it could be help to reduced the risk. Computational analysis result from numerical models were compared with a real scale fire test. For computational analysis, the Fire Dynamics Simulator(FDS) was conducted with a Large Eddy Simulation(LED) model for turbulence. Especially, The computational fire modeling can help to mitigate risk and to prevent a fire.
A Study on Characteristics of Turbulence Models for Numerical Fire Analysis in Large Space Structure
Ahn, Chan-Sol ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 219~227
DOI : 10.9798/KOSHAM.2014.14.5.219
FDS (Fire Dynamics Simulator) is one of the most universal software used for fire analysis in Korea. It`s the software which has been developed and updated for 25 years by NIST in USA and online distributed at no cost for use by the researchers and students worldwide who are engaged in fire research as well as has long been verified by the experts. Then Smagorinsky`s LES (Large Eddy Simulation) model adopted in FDS for turbulence analysis is the model developed earlier than any other LES models and is known to be far behind in terms of reliability when applying to calculation of the building with complex shape. This study, for the purpose of evaluating the fire analysis performance of FDS in large space, is intended to evaluate the characteristics of large-space fire analysis of 4 different types of LES model used in FDS with Murcia Atrium Fire Test conducted in Murcia in Spain and consequently, it`s confirmed that Dynamic Smagorinsky model predictes the outcome which is closer to experiment value than any others.
A Study on the Fire Resistance Performance Evaluation of Steel Structure Using Performance-Based Fire Resistance Design
Lee, Jae-Sung ; Yang, Seung-Cho ; Na, Ok-Pin ; Kweon, Oh-Sang ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 229~235
DOI : 10.9798/KOSHAM.2014.14.5.229
Advanced foreign countries have performed the fire resistance design of buildings by the alternative performance design methods, which are based on fire engineering theories. However, in the case of South Korea, the process on the alternative fire resistance performance design has only suggested without any applications for real steel structures. This study was performed to evaluate the fire resistance performance of a steel building using the fire resistance performance design program, which was developed in the former research. From this study, it was obtained that the fire resistance design was over designed for the steel building in South Korea.
Numerical Analysis on Smoke Control System in Real-scale Experimental Large Space
Kim, Jung Yup ; Kim, Ji Seok ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 237~243
DOI : 10.9798/KOSHAM.2014.14.5.237
Because of higher floor height in a large space where a large volume of smoke reaching to hundreds of thousands CMH(
) is generated in the event of fire, coupled with difficulties with compartmentation which is important concept in smoke control design, damage to the people by smoke is inevitably increased and thus, the countermeasure to deal with it is a must. This study is intended to evaluate Murcia Atrium Fire Tests performed in Spain and numerical analysis of smoke flow in a real-scale large space was carried out with same object. As a result of comparing the test and numerical analysis, the numerical analysis approach adopted in this study demonstrated effective application to smoke flow analysis in a large space. Moreover, numerical analysis was further carried out while changing the location of smoke vents and the exhaust flow rate, and consequently smoke concentration appeared to be more dependent on exhaust flow rate than smoke vent location and smoke layer height was determined according to N% rule.
Analysis of Foreign Car Fire that Broke Out in Passenger Room during Driving
Lee, Euipyeong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 245~253
DOI : 10.9798/KOSHAM.2014.14.5.245
Although most of people believe that fires do not break out in expensive foreign cars, fires have broken out in such expensive foreign cars. In this paper, the cause and liability of expensive foreign convertible fire during driving was analyzed. As a result of analysis, the fire cause was the short-circuit of an electric wire distributed in the inside of dashboard in front of the passenger seat. Because the short-circuited electric wire is located in the inside of dashboard and cannot be checked out without disassembly of dashboard, car owners or drivers cannot manage and often use until the expected life span without exchange or car service. Therefore, it is analyzed that a car owner or a driver is not responsible for this fire and the fire cause is associated with car maker`s manufacturing defect.
A Study of Fire Risk Caused by the Disconnection of the Neutral Ground in the PAD-Mounted Transformer
Yoo, Jae-Ick ; Joung, Jae-Hee ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 255~259
DOI : 10.9798/KOSHAM.2014.14.5.255
Some of the PAD-mounted transformers managed by KEPCO share the common neutral ground for both low and high voltages. When the common neutral ground of PAD-mounted transformer is disconnected, high voltage current is supplied to the low voltage circuits due to the current imbalance in the transformers, exposing the residential areas to unexpected high voltage currents supply. As a result, there is increased risk of fire due to damages in low voltage distribution boards and electrical equipments. This work presents recommendations in the design and the maintenance of the PAD-mounted transformers and additional safety measures for low voltage parts to mitigate the risks of fire.
Design and Implementation of an Mobile Robot for Fire Surveillance
Ha, Hun Woo ; Lee, Un Kun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 261~266
DOI : 10.9798/KOSHAM.2014.14.5.261
This study has designed and implemented the fire surveillance moibile robot KFR1(Busan Kyungsang College Fire Robot #1 called as KFR1) which can detect a fire at the beginning and transmit the fire-related information accurately to the fire surveillance monitoring system, and then carried out the performance test at a lecture room under the assumption of fire event. Through this test, we found out that when KFR1 moves and detects the obstacle on its traveling path, KFR1 prevents colliding with it by using the ultrasonic senor and that KFR1 detects the fire by using a flame detector in the event of the fire. Also, KFR1 can measure a variety of data by using installed flame detector, temperature sensor, global positionning sensor and RF type CCD camera, and transmit it through Bluetooth to the fire surveillance monitoring system. Therefore, KFR1 has been proved to solve the blind spot of valid detection on the flame detector and to provide the basic data in investigating a fire through the collected fire surveillance video. Furthermore, KFR1 has demonstrated through the test that it is easier to repair and maintain than the existing flame detector installed in the wall.
Analysis for Detector Response Time by Installation Location of Heat Detector
Ryu, Ho Cheol ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 267~274
DOI : 10.9798/KOSHAM.2014.14.5.267
The first operation of alarm system starts at a detector. And the largest effect is depend on the operation of detector related to the installation location of fire source and detectors. But in National Fire Safety Code, standard for the installation of detector only specifies matters of fire detector installation by area and height, without consideration of installation location and fire source location. Therefore, this study carried out a fire test in consideration of installation location of fire source and detectors(5 places) in order to minimize casualties as a result of the fast operation of fire detector when a fire occurred. Considering that it took the longest time for a detector close to a wall to work in the results of this test, it was possible to find that a minimum clearance to the wall was required.
Non-contact Local Fault Detection of Railroad Track using MFL Technology
Kang, Donghoon ; Kim, Ju-Won ; Park, Su-Young ; Park, Seunghee ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 275~282
DOI : 10.9798/KOSHAM.2014.14.5.275
In this study, a magnetic flux leakage (MFL) method which is suitable for the continuum ferromagnetic structure and verified by the previous studies was applied for the rail inspection. A prototype of multi-channel MFL sensor head was fabricated using Hall sensors and permanent magnets. To verify the feasibility of the proposed technique, a series of experiments was performed. 6 real rail specimens with several types of damage were prepared, and scanned by using the MFL sensor head to measure the magnetic flux density of the specimen. In the experimental result, MFL technique can detect successfully the local damage on vertical and diagonal direction. Through the further study, it is expected that MFL based nondestructive evaluation technique can be used effectively for detecting local faults of railroad tracks by convergence of the suitable transportation equipment and IT technology.
Effect of Changes in Soil Maps on the Effective Rainfall Based on SCS CN Method
Kim, Jungho ; Yoo, Chulsang ; Park, Moojong ; Joo, Jingul ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 283~291
DOI : 10.9798/KOSHAM.2014.14.5.283
This study was conducted to compare characteristics of various soil maps and difference criteria of hydrologic soil group in detail. As a result, it was found that hydrologic soil groups between reconnaissance and detailed soil map has a large difference. There are also differences in the three different detailed soil maps. Likewise, the difference of hydrologic soil group is the result of a huge difference in the runoff curve number. Three soil maps were studied to examine the effect of changes in soil maps on effective rainfall calculation for Pyeongchang river basin. It was found that the runoff curve number is varied depending on the detailed soil map, even though it was in the same basin. The difference between maximum and minimum runoff curve number was higher than 13 depending on the detailed soil map. Consequently, a change of soil map has a decisive effect on the runoff curve number, so it is possible that the changes affect the estimates of flood runoff discharge.
Evaluation of Problems to Apply Runoff Curve Number to Mountain Area in Korea
Kim, Jungho ; Yoo, Chulsang ; Park, Moojong ; Joo, Jingul ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 293~298
DOI : 10.9798/KOSHAM.2014.14.5.293
This study examined problems in application process of SCS curve number method and its effect on estimating effective rainfall in mountain area. First, it was found that the mountainous area in South Korea, which has a high percentage rate of rocky surface, needs to be categorized as an area for independent land-use. When the rocky area was considered for independent land-use, SCS curve number was higher than 5.75%. Thus, there is a possibility that it affects the estimate effective rainfall. Second, it is crucial to make accurate match for the same cover type between South Korea`s and USA`s employing cover type table from National Resources Conservation Service. Moreover, it is a challenge to ascertain which cover type from NRCS is suitable with Korea because most of the previous studies conducted have not provided reasons why the studies use such kind of cover type. The results on this study are useful when SCS curve number method is applied to estimate the amount of flood discharged.
Analysis of Future Hydrological Cycle considering the Impact of Climate Change and Hydraulic Structures in Geum River Basin
Jun, Hwandon ; Kim, Soojun ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 299~309
DOI : 10.9798/KOSHAM.2014.14.5.299
The purpose of this study is to evaluate the impacts of climate change and hydraulic structures on future hydrological cycle in the Geum river basin. The rainfall-runoff model was built up using Soil and Water Assessment tool and the three weirs were input to the model as reservoir factor. The nine weather data series consisted by the three climate change scenarios and the three climate models were used as input data sets of the model. The spatio-temporal change of the hydrological cycle characteristics was explored in the three future periods (2010-2039, 2040-2069, 2070-2099) on the basis of the historical period (1980-2009). As a result, the trends showed the increase of precipitation, evapotranspiration, and runoff and the decrease of snowmelt and soil water content. The runoff and its uncertainty increased in the mid-term and long-term from the estimated result. Both of the flood and drought risk was predicted to increase due to the increased runoff in wet season and the decreased runoff in dry season. Especially drought damage will be the most serious in the future.
Numerical Analysis of Turbid Flow considering Density Variation in Reservoir
Lee, Seong Dae ; Shin, Young Seop ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 311~316
DOI : 10.9798/KOSHAM.2014.14.5.311
In this study, we developed the program where the density flow can be analyzed numerically when turbid water flows into the resorvoir. The movement of the freesurface and the density variations are considered in the program where the unstructured grid systems are used to cover the various geometries. The level set method is used to treat the movement of the freesurface where the easier method without solving the partial differential equations of the wave type are developed by using the informations of the connection of the cells in the domain. To verify numerical schemes, several problems are simulated. The numerical results are compared with other`s one and our numerical schemes are shown to be valid.
Projection of Climate Change with Uncertainties: 1. GCM and RCP Uncertainties
Kim, Jongho ; Cho, Hye-Rin ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 317~327
DOI : 10.9798/KOSHAM.2014.14.5.317
Three sources of uncertainties occurring in projection of climate change have been considered, and investigated numerically. This study accounts for the uncertainties caused by both imperfect multiple GCM(General Circulation Models) and unknown emission amount while the companion study addresses the uncertainty of climate internal variability. First, the uncertainty of future external forcings is simulated by using the RCP(Representative Concentration Pathway) scenarios provided from IPCC(Intergovernmental Panel on Climate Change), and the GCM uncertainty is quantified through a BWA(Bayesian Weighted Averaging) method. The three future periods, 2011-2040, 2041-2070, 2071-2100, and two emission scenarios, RCP4.5 and RCP8.5 are employed, and 1,000 samples are obtained for the 3 periods and 2 scenarios, respectively. From the results of BWA for 18 GCM ensemble, temperature will continuously increase as time passes, but the precipitation does not show any significant trend. In general, the variability on the projection of climate change tends to increase more substantially in the end of century than the early, so that considering variability through a BWA analysis in studies of climate change is necessary.
Projection of Climate Change with Uncertainties: 2. Internal Variability
Kim, Jongho ; Cho, Hye-Rin ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 329~339
DOI : 10.9798/KOSHAM.2014.14.5.329
When projecting climate change on future, considering uncertainties due to multiple GCMs and emission scenarios carried out in the previous companion paper and that caused by climate internal variability addressed in this paper is one of the most crucial factors. In this study, a weather generator is employed to generate a time series corresponding to 3,000 years of temperature and precipitation for three future periods, 2011-2040, 2041-2070, 2071-2100, and two emission scenarios, RCP4.5 and RCP8.5, from which the information on climate natural variability was quantified. The comparisons among 3 uncertainty bounds have concluded that for precipitation, the climate internal variability is most significant regardless of time windows while for temperature, the uncertainty by emission scenarios tends to increase as the time passes.
Analysis on the Sedimentation Characteristics according to Slope Variation of Storm Sewer Pipe Line
Song, Yang Ho ; Lee, Jung Ho ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 341~350
DOI : 10.9798/KOSHAM.2014.14.5.341
Reduction of discharge capacity due to sedimentation in sewer increase danger of the inundation risk because of occurrence of frequent localized heavy rainfall, we need to find the fundamental solution for sewer design and maintenance. However, internal researches considering sedimentation in sewer designs are very insufficient, should be urgently required by considering the characteristics about future research and design standards. In this study, examines the design concept for discharge capacity and reduction of sedimentation in sewer networks. The virtual sewer networks are designed to analysis and distribute the sedimentation of depositional patterns in the sewer conduits, while considering the sedimentation diameter, in order to reduce the inundation risk. Accordingly, to analyze detailed changes in conduit designs in urban sewer networks, tried to reduction of sedimentation in sewer networks using modified pipe slope in Bujeon stream catchment, Busan. The various sewer designs were applied to Bujeon stream catchment and then, the most effective reduction of sedimentation volume over 30%. Just, total sedimentation depth separately intended the variation cases contrary to total sedimentation volume, we need to consider about entirely adequate aspect of related to design safety. So, including both the volume and the depth consideration through estimating the reliability of sewer network systems.
A Combined Model of Hydrology, Hydraulics, Erosion and Sediment Transport at Watershed Scale
Kim, Jongho ; Han, Sejong ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 351~358
DOI : 10.9798/KOSHAM.2014.14.5.351
In this study, a combined model that is simultaneously capable of considering hydrological processes, flow dynamics, erosion and sediment transport is presented. The developed model, called tRIBS-FEaST, not only solves many hydrologic processes such as interception, evapotranspiration, infiltration, runoff production, and groundwater dynamics, but computes two governing equations: the Saint-Venant flow and Hairsine-Rose erosion and sediment transport equations. The predictions of the combined model are compared and verified with the measurements of an experimental flume study with a satisfactory accuracy. The spatial distributions of morphological variables also provide an interesting result, i.e., even the same amount of rainfall can vary the concentrations and deposited masses of each particle size depending on the early and late time addressed. This phenomenon is consistent with "non-uniqueness" that morphologic response to given rainfall or runoff is not always identical. A hypothesis suggested in this study is that the deposited layer in which the amount and composition of the layer is continuously changing can be one of the reasons for this phenomenon. Thus, following analysis based on many data measured in watersheds will be necessary to fully verify the hypothesis and in the end, the model will be more useful when it is applied to a future climate condition where previous developed hydraulics-based erosion models cannot be used due to unknown boundary conditions.
Application of Geological Weighted Regression to Establish Loss Functions Reflecting Spatial Variation
Cheong, Taesung ; Necesito, Imee V. ; Yu, Insang ; Jeong, Sangman ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 359~370
DOI : 10.9798/KOSHAM.2014.14.5.359
Flood damage estimated by loss function is main factor to assess flood risk for local disaster prevention and response or project for sustainable development. The loss function as an empirical flood depth-damage curve is generally established by Ordinary Least Squares (OLS) as a Global Regression Model (GRM). This study collects flood depths from GIS based flood inundation map and damages of local buildings from damages report collected by local government after flooding on August, 2012 in Gunsan City. The OLS is used to estimate damages of residential, commercial and agricultural buildings and then estimates are assessed quantitatively with coefficient of determination and spatial autocorrelation. The assessment results show that the Local Regression Model (LRM) is more adaptive than the GRM to estimate damages because the spatial patterns of residuals exhibit spatial autocorrelation. The Geographically Weighted Regression (GWR) developed here as one of the local regression model to establish the loss function not only capturing the spatial variations of the affecting factors but also modifying the OLS is proposed for future applications. This method have loss functions at each spatial locations which can estimates optimum damages with flood depths at each buildings defined by GIS information.
Characteristics of Sedimentation and Consolidation for Song-Do Dredged Soil
Yun, Daeho ; Kim, Yuntae ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 371~379
DOI : 10.9798/KOSHAM.2014.14.5.371
Objective of this paper is to construct a database for the design of reclamation area from experimental results including sedimentation and selfweight consolidation tests and consolidation tests. Dredged soil was taken at Song-Do in Busan. For sedimentation and selfweight consolidation tests, an acrylic cylinder with diameter of 200 mm and height of 1500 mm were used.Settling and consolidation coefficients were obtained from sedimentation and selfweight consolidation test with various drop heights (80 cm, 100 cm, 120 cm), and were compared with other experimental results. Average value of settling and consolidation coefficient was decided as 0.126 cm/min.Settling and consolidation coefficient largely depended on initial water content and silt and clay content.In addition,consolidation tests were performed for three specimens taken attop portion, middle portion and bottom portion of column, respectively, afterself-weight consolidation was completed.Consolidation properties including coefficient of consolidation, compression index and permeability were also obtained and compared with previous results.
Effects of Disaster Prevention of a Coastal Forest considering Wave Attenuation Ability
Lee, Seong Dae ; Kim, Mun Jeong ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 381~388
DOI : 10.9798/KOSHAM.2014.14.5.381
Recently, it has been widely recognized that coastal forests may have great value in protecting from wave attack, forming sand dunes and maintaining good scenery. Utilizing coastal forests as a countermeasure against storm surges or tsunamis has attracted engineers, because coastal forests have concurrent benefits both of disaster prevention and environmental preservation. This study investigates the morphologic properties of coastal trees which will act as hydrodynamic resistance against incident wave. Then, a numerical analysis based on the CADMAS-SURF model has been conducted. Wave attenuation due to the drag, porosity and width of coastal forests are well reproduced by the present numerical simulation. Comparison between with and without coastal forest model have revealed that the phases of water surface fluctuation and horizontal velocity proceed when the coastal forest model exists. The results show that the 60 m width of coastal forest was formed, the velocity was decreased by 36%, the energy flux by 2%. Therefore, it has been investigated that the affimative conclusions on the protective role of coastal forest against storm surges and tsunami.
Estimation of Design Flow Rate for LID Non-Point Pollutants Control Facilities based on Water Quality Flow
Lee, Jeonghoon ; Choi, Daegyu ; Park, Moojong ; Kim, Sangdan ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 389~393
DOI : 10.9798/KOSHAM.2014.14.5.389
In this study several design criteria for LID non-point pollutants control facilities based on water quality flow are investigated. Based on this review, an improved design flow rate is proposed. The desing flow rate of 2.5 mm/hr for LID facilities based on water quality flow is recommended in urban drainage catchment, and this result is expected to be able to make a very positive contribution to non-point pollutant sources management in the sense of providing reasonable design criteria of non-point pollutant control facilities.
Improvement of Preliminary Disaster Inspection and Consultation System
Kang, Sang Jun ; Jung, JuChul ; Lee, Dalbyul ;
Journal of Korean Society of Hazard Mitigation, volume 14, issue 5, 2014, Pages 395~406
DOI : 10.9798/KOSHAM.2014.14.5.395
The main purpose of this study is to develop implications for the improvement of current PDIS(Preliminary Disaster Inspection System) in Korea by assessing the practical applications of the system in Gyeonggi-do, Korea. Through the case reviews, the assessment reveals the following five problems of the current system: 1) no discrepancy between administrative and development plan reviews; 2) insufficient consideration of review comments during the implementation procedure; 3) lack of communication among the committee members; 4) lack of effective sanctions or measures to control following implementation actions; and 5) lack of proper tools to support the committee members` objective reviews or decisions. As implications, seven recommendations are addressed as follows: 1) criteria modification for administrative and development plan reviews, 2) cooperation with related parties for joined inspection and penalty system, 3) data development for decision making, 4) review of ordinance and committee meeting systems, 5) tight review process by committee members, 6) enlarged spatial analysis frame for vulnerability analysis and requirement of detailed follow up actions, 7) education program development for the review system.