• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.458-458
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• 2012

Climate extreme variability is a major cause of disaster such as flood and drought types occurred in Korea and its effects is also more severe damage in last decades which can be danger mature events in the future. The main aim of this study was to assess the effectives of climate change on drought for an agriculture as Nakdong basin in Korea using climate change data in the future from data of General Circulation Models (GCM) of ECHO-G, with the developing countries like Korea, the developed climate scenario of medium-high greenhouse gas emission was proposed of the SRES A2. The Standardized Precipitation Index (SPI) was applied for drought evaluation. The drought index (SPI) applied for sites in catchment and it is evaluated accordingly by current and future precipitation data, specific as determined for data from nine precipitation stations with data covering the period 1980-2009 for current and three periods 2010-2039, 2040-2069 and 2070-2099 for future; time scales of 3month were used for evaluating. The results determined drought duration, magnitude and spatial extent. The drought in catchment act intensively occurred in March, April, May and November and months of drought extreme often appeared annual in May and November; drought frequent is a non-uniform cyclic pattern in an irregular repetitive manner, but results showed drought intensity increasing in future periods. The results indicated also spatial point of view, the SPI analysis showed two of drought extents; local drought acting on one or more one of sites and entire drought as cover all of site in catchment. In addition, the meteorology drought simulation maps of spatial drought representation were carried out with GIS software to generate for some drought extreme years in study area. The method applied in this study are expected to be appropriately applicable to the evaluation of the effects of extreme hydrologic events, the results also provide useful for the drought warning and sustainable water resources management strategies and policy in agriculture basins.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.248-248
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• 2012

산사태나 토석류와 같은 산지재해가 빈발하고 인명과 재산의 피해가 증가함에 따라 적절한 대책이 시급하게 요구되고 있다. 이런 대책 중에서 신뢰도 높은 산지재해 예, 경보시스템을 구축하는 것은 매우 중요하다. 산림청에서는 산사태 예, 경보 발령을 위한 기준을 마련하고 있으나, 좀더 신뢰도 높은 기준을 필요로 한다고 생각된다. 본 연구에서는 강우분석을 통해서 우리나라의 자연사면에서 토석류, 산사태를 일으키는 강우의 특성을 파악하고, 나아가 산지토사재해 예, 경보시스템에 적절하게 활용될 수 있는 기준을 마련하고자 하였다. 이를 위해서 회귀분석, 판별분석을 적용하여 평가하였고, 보다 개선된 기준으로서 토양우량지수를 제시하였다. 토양우량지수는 강우에 의해 지반이 어느 정도 포화되어 있는가를 계산하여, 토사재해발생의 위험성을 나타낸 것이다. 본 연구에서는 2001년에서 2009년 사이에 충북 제천시 일대의 강우자료를 조사하여 탱크모델에 적용하여 각 탱크에서의 저류량을 계산하여 토양우량지수를 결정하였다. 세 개의 탱크 중에서 두 번째 탱크에서의 저류량 (S2)과 전체 탱크에서의 저류량 (TS)을 이용하여 상위에 랭크된 이력순위를 분석한 결과, S2에서는 산사태가 발생한 2009년 이력이 3번째 높은 수준으로 기록되며, 산사태 미발생의 2007년 강우는 5번째로 기록되었다. 그리고 TS의 경우 2009년 강우가 2002년에 이어 3번째 높은 수준으로 기록되었으며, 2007년 강우는 9번째로 기록되었다. 이러한 결과를 볼 때 토양우량지수의 이력순위는 산지토사재해의 발생을 잘 반영하는 것으로 나타났다. 또한 2011년 발생한 우면산 산사태를 대상으로 토양우량지수를 적용하여 예, 경보시스템의 적용가능성을 판단하였다.

• Geomechanics and Engineering
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• v.13 no.5
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• pp.861-879
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• 2017

Coal and gas outburst is a serious dynamic disaster that occurs during coal mining and threatens the lives of coal miners. Currently, coal and gas outburst is commonly predicted using single indicator and its critical value. However, single indicator is unable to fully reflect all of the factors impacting outburst risk and has poor prediction accuracy. Therefore, a more accurate prediction method is necessary. In this work, we first analyzed on-site impacting factors and precursors of coal and gas outburst; then, we constructed a Fisher discriminant analysis (FDA) index system using the gas adsorption index of drilling cutting ${\Delta}h_2$, the drilling cutting weight S, the initial velocity of gas emission from borehole q, the thickness of soft coal h, and the maximum ratio of post-blasting gas emission peak to pre-blasting gas emission $B_{max}$; finally, we studied an FDA-based multiple indicators discriminant model of coal and gas outburst, and applied the discriminant model to predict coal and gas outburst. The results showed that the discriminant model has 100% prediction accuracy, even when some conventional indexes are lower than the warning criteria. The FDA method has a broad application prospects in coal and gas outburst prediction.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.11
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• pp.1428-1433
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• 2019

Interest in mountain accidents among the technical trends of disasters in Korea is increasing continuously. When accidents occur, the most common methods are location tracking and accident reporting using smartphones, and rescue activities are being carried out by using them. In this paper, we proposed an improvement of wireless safety system for mountain climbing safety using 447 FSK. Using the 447 MHz band transmitter / receiver, it accumulates position coordinates and data through position transmission and rescue signal transmission in case of anomalies. If a sender is out of the threshold of the set area range, a danger warning notification can be generated to quickly exit the danger zone. Provide services. In addition, it is considered that the health condition of the sender is continuously checked and the receiver is warned when the specified threshold is exceeded, so that it is possible to respond to the sender's disaster.

• The Journal of the Korea Contents Association
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• v.21 no.3
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• pp.282-300
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• 2021

The purpose of this study was to explore what social media posts tell us about family life during the COVID-19 pandemic by examining the keywords and topics underlying posts on blogs and online forums. Our criteria for web crawling were (a) blog and forum posts on Naver and Daum, the top portal sites in Korea, (b) posts between February 23 and April 19, 2020, the period of the first heightened social distancing orders, and (c) inclusion of "COVID" and "family" or "COVID" and "home." We analyzed 351,734 posts using TF-IDF values and topic modeling based on latent Dirichlet allocation. We identified and named 22 topics including COVID-19 prevention, family infection, family health, dietary life and changes, religious life, stuck at home, postponed school year, family events, travel and vacations, concerns about family and friends, anxiety and stress, disaster and damage, COVID-19 warning text messages, family support policies, Shin-cheon-ji and Daegu. The results show that COVID-19 impacted various domains of family life including health, food, housing, religion, child care, education, rituals, and leisure as well as relationships and emotions.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.8
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• pp.1231-1237
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• 2022

It is necessary to dynamic recognition system with real time loading height and pressure of the loading waste, the drying of wood, batteries, and plastic wastes, which are representative compositional wastes, and the carbonization changes on the surface. The dynamic context awareness service constituted a platform based on Universal Middleware system using BCN convergence communication service as a Ambient SDK model. A context awareness system should be constructed to determine the cause of the fire based on the analysis data of fermentation heat point with natural ignition from the load waste. Furthermore, a real-time dynamic service platform that could be apply to the configuration of scenarios for each type from early warning fire should be built using Universal Middleware. Thus, this issue for Internet of Things realize recognition platform for analyzing low temperature fired fire possibility data should be dynamically configured and presented.

• The Journal of the Convergence on Culture Technology
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• v.8 no.6
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• pp.775-785
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• 2022

By analyzing the operation status of fire safety management of small construction site workers, deriving problems, and suggesting improvement measures, this study was conducted to present practical basic data for their efficient use in the future, and the following conclusions were drawn. First, it was analyzed that small construction site workers are elderly in the age group of construction workers, have short construction skills, most of the jobs are working in the construction industry, and the employment type is non-regular workers. Second, the fire safety management improvement plan of small construction site workers is systematized, fire safety manager is deployed to manage fire risk, fire escape routes and emergency warning facilities are provided to inform all workers at the construction site. In addition, measures to reduce industrial accidents are needed through realistic evacuation training, fire VR training, and interesting educational programs.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.188-188
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• 2023

지구온난화, ENSO 등 전지구적인 기후변화 현상으로 위험기상 발생이 증가하고 있다. 한반도는 삼면이 바다에 접하였기 때문에 매우 불안정한 대기로 저기압이 빈번히 통과하는 특징을 가지며, 우리나라는 매년 이상기후로 인한 기상재해로 인명 및 재산 피해가 증가하는 추세를 보이고 있다. 최근 10년간 가장 많이 발생한 피해액 기준 대형 자연재난은 호우로 총 49회 발생하였다. 호우는 다른 기상재해에 비해 발생 시간이 짧고, 공간 규모가 작을 뿐만 아니라 시공간적으로 변동성이 매우 크기 때문에 발생 시 많은 인명 및 재산 피해를 유발한다. 기상청은 호우 외 9가지 기상현상으로 인해 중대 재해 발생이 예상되는 경우 주의를 환기하거나 경고를 예보하는 특보를 발표한다. 현재 사용 중인 호우특보 기준은 기후변화와 위험기상 발생 패턴 변화에 따른 호우 피해와 강우량의 상관성을 고려해 3시간 강우량 개념으로 강우강도, 12시간 강우량 개념으로 누적강우량을 파악할 수 있게 개선한 결과이다. 그러나 지역 특성을 반영하지 아니하고, 하나의 특보 기준 값을 전 지자체에 적용하기 때문에 국지성 집중호우의 지역별 특성을 세세히 반영하지 못하는 등 한계를 보인다. 이와 반대로 영국의 경우 기상특보 기준에 기상현상이 미치는 영향을 포함하였으며, 일본의 경우 우리나라 시군구 개념인 시정촌별로 기상특보 기준을 다르게 설정하여 운영 중이다. 지역 특성을 반영한 해외 기상특보 사례와 달리 우리나라 기상특보는 지역별 위험 및 사회·경제적 취약성을 고려하지 않아 특보 기준 값이 획일화되어 있음을 확인했다. 이에 본 연구는 기상특보 중 호우특보로 연구 범위를 한정하고, 위험기상의 획일적 의사결정 시스템을 보완하기 위해 영향한계강우량과 재해위험성을 고려한 호우특보 기준을 연구하여 제안하고자 한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.2
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• pp.263-272
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• 2022

As a result of climate change, the heatwave and urban heat island phenomena have become more common, and the frequency of heatwaves is expected to increase by two to six times by the year 2050. In particular, the heat sensation index felt by workers at construction sites during a heatwave is very high, and the sensation index becomes even higher if the urban heat island phenomenon is considered. The construction site environment and the situations of construction workers vulnerable to heat are not improving, and it is now imperative to respond effectively to reduce such damage. In this study, satellite imagery, land surface temperatures (LST), and long short-term memory (LSTM) were applied to analyze areas above 33 ℃, with the most vulnerable areas with increased synergistic damage from heat waves and the urban heat island phenomena then predicted. It is expected that the prediction results will ensure the safety of construction workers and will serve as the basis for a construction site early-warning system.

• Journal of Korea Water Resources Association
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• v.56 no.12
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• pp.929-937
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• 2023

This study aims to develop rules for the Determination of Drought Stages at the Local Level based on the drought cases in Gwangju and Jeollanam-do in 2022-2023. Among the eight drought indicators provided, six indicators (Agricultural drought stage (for paddy), Residential & industrial drought stage, SPI-12, Relative agricultural water storage, Residential water consumption change (for domestic use), Residential water consumption change (for non-domestic use) were confirmed to have statistical correlations with the perceptions of local government officials and experts. Additionally, this drought indicator was applied to a decision tree algorithm to develop rules for determining the severity of drought. Although it presented results similar to those of the existing method presented in previous studies, it showed a significant comparative advantage in explaining the temporal and spatial patterns of drought in the Gwangju and Jeollanam-do.