• Title/Summary/Keyword: disaster warning

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The big data method for flash flood warning (돌발홍수 예보를 위한 빅데이터 분석방법)

  • Park, Dain;Yoon, Sanghoo
    • Journal of Digital Convergence
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    • v.15 no.11
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    • pp.245-250
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    • 2017
  • Flash floods is defined as the flooding of intense rainfall over a relatively small area that flows through river and valley rapidly in short time with no advance warning. So that it can cause damage property and casuality. This study is to establish the flash-flood warning system using 38 accident data, reported from the National Disaster Information Center and Land Surface Model(TOPLATS) between 2009 and 2012. Three variables were used in the Land Surface Model: precipitation, soil moisture, and surface runoff. The three variables of 6 hours preceding flash flood were reduced to 3 factors through factor analysis. Decision tree, random forest, Naive Bayes, Support Vector Machine, and logistic regression model are considered as big data methods. The prediction performance was evaluated by comparison of Accuracy, Kappa, TP Rate, FP Rate and F-Measure. The best method was suggested based on reproducibility evaluation at the each points of flash flood occurrence and predicted count versus actual count using 4 years data.

Development of Heat-Health Warning System Based on Regional Properties between Climate and Human Health (대도시 폭염의 기후-보건학적 특성에 기반한 고온건강경보시스템 개발)

  • Lee, Dae-Geun;Choi, Young-Jean;Kim, Kyu Rang;Byon, Jae-Young;Kalkstein, Laurence S.;Sheridan, Scott C.
    • Journal of Climate Change Research
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    • v.1 no.2
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    • pp.109-120
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    • 2010
  • Heat wave is a disaster, which increases morbidity and mortality in temperate regions. Climate model results indicate that both intensity and frequency of heat wave in the future will be increased. This study shows the result about relationship between excess mortality and offensive airmass in 7 metropolitan cities, and an operational Heat-Health Warning System (HHWS) in Korea. Using meteorological observations, the Spatial Synoptic Classification (SSC) has been used to classify each summer day from 1982 to 2007 into specific airmass categories for each city. Through the comparative study analysis of the daily airmass type and the corresponding daily mortality rate, Dry Tropical (DT), and Moist Tropical plus (MT+) were identified as the most offensive airmasses with the highest rates of mortality. Therefore, using the multiple linear regression, forecast algorithm was produced to predict the number of the excess deaths that will occur with each occurrence of the DT and MT+ days. Moreover, each excess death forecast algorithm was implemented for the system warning criteria based on the regional acclimatization differences. HHWS will give warnings to the city's residents under offensive weather situations which can lead to deterioration in public health, under the climate change.

Analysis on Flood Control Effect of Siphon Spillway by Reservoir Routing (저수지 추적을 통한 사이펀 여수로의 홍수조절 효과 분석)

  • Ko, Suhyeon;Kim, Jaeyoung;Lee, Giha
    • Journal of the Korean GEO-environmental Society
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    • v.14 no.11
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    • pp.55-63
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    • 2013
  • Agricultural small dam reservoirs in Korea are vulnerable to flooding because of insufficient flood control capacity and deterioration such that reservoir water level is likely to rise rapidly and a large amount of water release quickly to downstream without flood warning. In this study, we performed hydrologic analysis to estimate design flood(200 years return period ${\times}1.2$) and also evaluated the effect of siphon spillway as a structural countermeasure for flood control and mitigation by applying reservoir routing to the Jipyeong reservoir, located in Sangju, Korea. The results show that the design flood was calculated at $284.3m^3/s$, and water level and water release decreased by 40cm and $91m^3/s$, respectively.

Assessment of Inundation Rainfall Using Past Inundation Records and CCTV Images (CCTV영상과 과거침수기록을 활용한 침수 강우량 평가 - 강남역을 중심으로 -)

  • Kim, Min Seok;Lee, Mi Ran;Choi, Woo Jung;Lee, Jong Kook
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.30 no.6_1
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    • pp.567-574
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    • 2012
  • For the past few years, the video surveillance market has shown a rapid growth due to the increasing demand for Closed Circuit Television(CCTV) by the public sector and the private security industry. While the overall utilization of CCTV in the public and private sectors is expanding, its usage in the field of disaster management is less than sufficient. Therefore, the authors of this study, in an effort to revisit the role of CCTV in disaster situations, have carried out a case analysis in the vicinity of the Gangnam Station which has been designated as a natural disaster-prone area. First, the CCTV images around the target location are collected and the time and depth of inundation are measured through field surveys and image analyses. Next, a rainfall analysis was conducted using the Automatic Weather Station(AWS) data and the past inundation records. Lastly, the authors provide an estimate of rainfall for the areas around the station and suggest viable warning systems and countermeasures. The results from this study are expected to make positive contributions towards a significant reduction of the damages caused by the floods around the Gangnam Station.

Establishment of Automatic Response System for Disaster Prevention using GIS (GIS를 이용한 재해상황 자동음성 통보시스템 구축)

  • Jung, Dae-Young;Bang, Hee-Bong;Shin, Young-Chul
    • Journal of the Korean Association of Geographic Information Studies
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    • v.5 no.1
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    • pp.69-79
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    • 2002
  • The more people and urban infrastructures are crowded in a society, the more possibilities of disasters are existed. Most of cities have a difficulty in coping with unpredictable disasters consisting of natural and human characteristics. As a proved before, theses disasters have serious effects on socio-economical, financial and physical damages, and human lives. Although we have prepared various types of disaster-protection programs, there are rooms to be desired in establishing advanced warning system towards safeguards of disasters. In this research, we propose semantic ideas of an advanced information system associated with automatic voicing mail linking to telephone. This conceptual model and its architecture is for not only predicting and analyzing disasters, but also recommending counter-measurements and solutions for risks and dangers in disastrous circumstances. However, there are little works with regard to definitions and conceptual models of automatic voicing mail system in the context of geographical information sciences. Therefore, this research focuses on scrutinizing the effect of possible natural vulnerability and human hazards in our present societies.

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Development of Levee Safety Revaluation for Satellite Images (위성 이미지를 활용한 제방 안정성 평가 기법 개발)

  • Bang, Young Jun;Lee, Seung Oh
    • Journal of Korean Society of Disaster and Security
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    • v.15 no.3
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    • pp.1-14
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    • 2022
  • Recently, the risk of water disasters are increasing due to climate change and the aging of river levees. Existing conventional river embankment inspections have many limitations due to the consumption of a lot of manpower and budget. Thus, it is necessary to establish a new monitoring and forecast/warning method for effective flood response. This study proposes the river levee health monitoring system by analyzing the relationship between river levee deformation and hydrological factors using Sentinel-1. The variance index calculated in this study was classified into 4 grades. And the levees collapse section was judged to be a high vulnerable point in which the variance rapidly increased based on the result of the rapid increase in soil moisture. In the future, it is expected that it will be possible to advance levee maintenance technology and improve national disaster management through the advancement of the existing levee management system and automated monitoring through the forensic method that combines remote technology.

The Necessity of Introducing Fire Point Notification Displays in Complex Buildings to Reduce Required Safe Escape Time(RSET) (RSET 감소를 위한 복합건축물의 화재발생지점 알림표시등 도입 필요성)

  • Jusung Kim;Jongkwen Ha;Hasung Kong
    • Journal of the Korea Safety Management & Science
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    • v.26 no.3
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    • pp.71-82
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    • 2024
  • In modern society, buildings are becoming more complex, and the population is becoming more densely populated. Such large buildings require a variety of evacuation measures, as there is a high possibility of large-scale human casualties due to increased evacuation distance and evacuation time in the event of a fire. Strobe light and exit sign light are used as important evacuation equipment to provide early warning and evacuation directions. In this thesis, we conducted a fire simulation assuming that a fire occurrence point notification function and a strobe light function were added to equipment such as visual alarms and evacuation guidance, and compared and analyzed the difference in evacuation completion time with existing equipment. The scenarios for the simulation were divided into "general fire situations" and "fire location and evacuation exit guidance situation" and the differences in evacuation completion time in the event of a fire were compared and analyzed for each floor from the 1st floor to the 3rd floor. The maximum travel distance to complete evacuation in the case of a fire on the first floor decreased by 80.6 m and the evacuation completion time decreased by 329.4 seconds, and the maximum travel distance to complete evacuation in the case of a second-floor fire decreased by 28.5 m and the evacuation completion time by 438.8 seconds. During the fire on the third floor, the maximum distance decreased until evacuation was completed to 3.4 m, and the evacuation completion time was reduced by 355.6 seconds. It is expected that if the congestion level of evacuation routes is reduced by utilizing the congestion level of evacuation exits when fire alarm systems and evacuation equipment are activated, the evacuation completion time will be further shortened and evacuations will be carried out quickly and safely.

Tension Wire Sensor of shallow failure detection for the real time slop stabilization (지표변위 감지 센서를 활용한 사면 안전감지 시스템)

  • 장기태;윤기재;정성윤;유병선;김경태;이원효
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.10c
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    • pp.19-27
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    • 2001
  • Early detection of premonitory symptom of slope movement ensures tremendous saving of lives and repair costs from catastrophic disaster. Therefore, it is essential to constantly monitor the performance and integrity of both reinforced and un-reinforced cut slopes. We developed a novel monitoring system by using tension wire sensors. It's advantages are highly sensitivity, simple installation, large displacement measurement, durability of system, capability of remote sensing. Real-time measurement of slope surface movement is shown graphically and it gives a warning when the monitored value exceeds a given threshold level so that any sign of abnormal slope movement can be easily perceived.

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Earthquake Disaster Warning System Designed to Build in Mongolia (몽골 지진재난경보시스템 구축을 위한 시스템 설계)

  • Ahn, Byungdug;Gwak, U-Seok;Kim, Yu-Hyeok;Lee, Won-Seok;No, Dong-Seon;Lee, Seung-Hyeong
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2016.06a
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    • pp.16-18
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    • 2016
  • 본 논문에서는 몽골 지역에 발생하는 지진이 대규모 집단 거주지 및 상업 지역인 울란바타르(Ulaanbaatar) 도심지역에 큰 피해를 주고 있는바, 지진재난경보시스템 개발하여 현장에 구축함으로써 신속히 지진발생 상황을 전파하여 몽골 국민의 생명을 보호하고 재산피해를 줄이는데 역할을 수행할 수 있다. 울란바타르 외곽에 지진파를 감지할 수 있는 지진센서를 설치하고, 지진파를 수집하여 분석하고 진도의 단계에 따라 이벤트를 발생한다. 지진의 세기에 따라 단계별 상황을 판단하고 시민들이 빠른 대피를 할 수 있도록 울란바타르 도심지역에 경보방송을 전달함으로써 지진 피해를 최소화 시킬 수 있다.

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Hazard analysis and monitoring for debris flow based on intelligent fuzzy detection

  • Chen, Tim;Kuo, D.;Chen, J.C.Y.
    • Structural Monitoring and Maintenance
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    • v.7 no.1
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    • pp.59-67
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    • 2020
  • This study aims to develop the fuzzy risk assessment model of the debris flow to verify the accuracy of risk assessment in order to help related organizations reduce losses caused by landslides. In this study, actual cases of landslides that occurred are utilized as the database. The established models help us assess the occurrence of debris flows using computed indicators, and to verify the model errors. In addition, comparisons are made between the models to determine the best one to use in practical applications. The results prove that the risk assessment model systems are quite suitable for debris flow risk assessment. The reproduction consequences of highlight point discovery are shown in highlight guide coordinating toward discover steady and coordinating component focuses and effectively identified utilizing these two systems, by examining the variety in the distinguished highlights and the element coordinating.