Journal of the Korean Society of Hazard Mitigation最新文献_第3页

Developing Cluster-based Fire Following Earthquake Risk Evaluation Method using Building Registration Data 利用建筑物登记数据开发基于群集的地震后火灾风险评估方法

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.279

Kang Taewook, Jiuk Shin, Dong-gyu Kim, Jaedo Kang

引用次数: 0

Research on Deep learning based Ultrasonic Image Learning to Develop a Gas Leak Detection Model 基于深度学习的超声波图像学习以开发气体泄漏检测模型的研究

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.135

Yunjeong Gu, Kwanghyun Park, Wonhee Lee, Byunghun Song, Jungpyo Hong, Junho Shin

{"title":"Research on Deep learning based Ultrasonic Image Learning to Develop a Gas Leak Detection Model","authors":"Yunjeong Gu, Kwanghyun Park, Wonhee Lee, Byunghun Song, Jungpyo Hong, Junho Shin","doi":"10.9798/kosham.2023.23.6.135","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.135","url":null,"abstract":"If a gas leak occurs in an industrial area, identifying the location of the gas leak and predicting the scale of the accident are challenging owing to the invisible nature of the gas. In this study, we developed a deep learning-based gas leak detection model that can obtain not only the gas leak status, but also the gas leak location and flow rate information, by using technology to visualize the ultrasonic waves generated during gas leaks. Research methods are broadly categorized into data collection and model learning methods. First, data was collected using an ultrasonic camera to capture ultrasonic images at different measurement distances (1 and 3 m) and gas leak flow rates (0-8 L/min). YOLO (You Only Look Once) was used for image learning, and the model was trained after setting the class according to the gas-leak flow range. The clarity of the collected ultrasonic images decreased as the measurement distance increased. In addition, there was little difference between the images for each leakage flow rate, posing challenges in distinguishing them with the naked eye. However, the model learning results showed high accuracy, with a precision of 0.960, recall of 0.967, and mAP (IoU (Intersection over Union) 50%) of 0.987. Applying this model as a gas safety management technology at industrial sites, enables the accurate determination of gas leak status, gas leak location, and gas leakage flow. This information is expected to guide appropriate accident responses for workers.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"115 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139135213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of the DO Factor at Bugok Bridge, Oncheoncheon, Using Deep Learning 利用深度学习预测温川富谷桥的溶解氧系数

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.325

Heesung Lim, Hyunuk An, Jaenam Lee, Hyungjin Shin, Nagweon Choi, Jingul Joo

{"title":"Prediction of the DO Factor at Bugok Bridge, Oncheoncheon, Using Deep Learning","authors":"Heesung Lim, Hyunuk An, Jaenam Lee, Hyungjin Shin, Nagweon Choi, Jingul Joo","doi":"10.9798/kosham.2023.23.6.325","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.325","url":null,"abstract":"The use of monitoring in river management is known to be both economical and rational, and the amount of digital information globally is increasing over time. AI research utilizing such data has been widely employed recently in the field of water resources and hydrology, yielding excellent predictive results. In this study, we utilized DO (Dissolved Oxygen) factor and meteorological data collected from the Bugok Bridge site in the Oncheoncheon watershed through an automatic water quality measurement network. We employed the LSTM (Long Short Term Memory) algorithm, a type of deep learning known for its excellent time series learning capabilities, as the learning algorithm. To confirm the potential of the use of big data, we conducted a comparative analysis by performing hourly and daily predictions, and an accuracy analysis by comparing actual and predicted data. For data utilization, missing data from the data collected by the automatic measurement network were linearly interpolated. It was confirmed that the predictive performance for the DO factor was higher using hourly than daily data.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"11 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Occupant Load Factor Calculation in Neighborhood Living Facilities while Performance-Based Design 基于性能的设计中邻里生活设施的居住负荷系数计算

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.187

Youngjoo Song, Hakjoong Kim

{"title":"Occupant Load Factor Calculation in Neighborhood Living Facilities while Performance-Based Design","authors":"Youngjoo Song, Hakjoong Kim","doi":"10.9798/kosham.2023.23.6.187","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.187","url":null,"abstract":"The criteria for calculating the occupant load factor are crucial for predicting the evacuation behavior of occupants during a fire, determining the size of the evacuation capacity, and significantly influencing the calculation of the Required Safe Egress Time (RSET) during fire safety assessments. There are currently 11 categories for classifying safe evacuation area installation targets for neighborhood living facilities; eight of these categories allow for various numerical values to be applied. However, applying numerical values from a conservative perspective results in excessive designs with larger occupant loads. Therefore, to address this issue, this study conducted a theoretical review of occupant loads and investigated and analyzed relevant domestic and international regulations. Subsequently, one of the buildings subject to a performance-based design in City 00 was selected, and occupancy criteria were applied based on the purpose of the space. A safety assessment of the evacuation was performed. The results show that, evacuation safety was not ensured at the two exits when the occupant load factor was below 4.6 m2/person. However, when the occupant load factor was greater than 9.3 m2/person, evacuation safety is guaranteed at all exits. Through this analysis, this study aims to raise awareness of issues related to the criteria for calculating the maximum occupancy in neighborhood living facilities and the need for revisions.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"71 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of Drought and Desertification Outlook in China Using Meteorological Drought Indices 利用气象干旱指数评估中国干旱和荒漠化前景

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.65

Hayong Kim, Jingul Joo

{"title":"Assessment of Drought and Desertification Outlook in China Using Meteorological Drought Indices","authors":"Hayong Kim, Jingul Joo","doi":"10.9798/kosham.2023.23.6.65","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.65","url":null,"abstract":"Changing land use patterns in China may result in adverse impacts on the climate in Northeast Asia. In particular, desertification of the Chinese mainland can also have a significant influence on the climate in South Korea, such as the occurrence of yellow dust storms. This study aimed to forecast the desertification in China through a comprehensive drought analysis. Three drought indices namely, SPI, GEVI, and SPEI, were determined for eight cities in China namely, Beijing, Guangzhou, Shanghai, Xianyang, Urumqi, Chongqing, Wuhan, and Weihai. There was a strong correlation between SPI and SPEI, while GEVI showed a slightly lower correlation. The long-term droughts that can trigger desertification exhibited high correlations among the considered indices. To assess the impact of climate change, periods of severe drought occurrence were compared in ten-year intervals since 1970. It was observed that severe droughts occurred throughout China in the 1970s and 1990s. However, there was no apparent trend in increasing drought days or worsening drought conditions. Desertification in China can be influenced not only by the rainfall but also by the changes in land use pattern and exploitation of water resources. Therefore, additional research is deemed necessary to evaluate desertification in China.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"100 39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139131577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stream Flow Management and Institutions: Studying Water Quality and Aquatic Ecosystems in Dry Seasons 溪流管理与机构：研究旱季水质和水生生态系统

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.317

Seongkyu Kang, Junwook Hur, Kisung Lee, Sijung Choi

引用次数: 0

Evaluating Structural Performance of U-shaped Precast Concrete Modular Joints 评估 U 型预制混凝土模块接缝的结构性能

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.13

Young Han Choi, Ji-Yong Chae, B. Heo

引用次数: 0

Experimental Study on the Smoke-Logging Phenomenon Owing to Sprinkler Operation During Initial Fire 初期火灾中喷水灭火器运行导致烟雾淤积现象的实验研究

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.219

Unggi Yoon, Inhyuk Koo, Matsuyama Ken, Young-Phil Kwon

引用次数: 0

Study on Fire Load and Duration of Fire in Logistics Facilities 物流设施火灾负荷和火灾持续时间研究

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.177

Sangbum Lee, Heewon Seo, Daehoi Kim, Gilyong Lee

{"title":"Study on Fire Load and Duration of Fire in Logistics Facilities","authors":"Sangbum Lee, Heewon Seo, Daehoi Kim, Gilyong Lee","doi":"10.9798/kosham.2023.23.6.177","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.177","url":null,"abstract":"Logistics facilities differ significantly from general buildings in terms of diffusion flame prevention technology, necessitating the application of fire diffusion prevention technology. The total fire load in a fire compartmentation was calculated according to the method presented in The NFPA (The National Fire Protection Association) Fire Protection Handbook, based on the results of a survey on the area, height, and rack dimensions of 29 logistics warehouses in Korea to improve the fire compartmentation standard. In addition, simulations were conducted using CFAST (Consolidated Fire and Smoke Transport) for the cross-validation of these methodologies. Through fire simulations, the temperature of the upper part of each fire compartment was derived, and the equivalent fire duration was calculated by converting it to an area based on the standard time-heating temperature curve of KSF 2257-1. The NFPA methodology and values calculated through fire simulations showed similar results. In addition, we analyzed the tendency of the equivalent fire duration according to the height of the fire compartmentation and confirmed that the higher the floor height, the higher the equivalent fire duration. The results of this study can be used as basic data for improving the fire prevention standards by calculating the equivalent fire duration according to the fire load of a logistics facility and for confirming the tendency of the equivalent fire duration according to the height of the fire compartment.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating Serviceability Limit State in a Long-span Skating Stadium Through Natural Frequency Analysis 通过自然频率分析评估大跨度滑冰场的适用性极限状态

Journal of the Korean Society of Hazard Mitigation Pub Date : 2023-12-31 DOI: 10.9798/kosham.2023.23.6.39

Gayoon Lee, Sung-Min Lee, Jae-Hyun Kim, K. Lee

引用次数: 0