Hyoseo An, Taesang Ahn, Sumin Kang, Jiuk Shin, Kihak Lee
{"title":"Structural Performance Testing and Finite Element Analysis of the ENTA Wall Frame System","authors":"Hyoseo An, Taesang Ahn, Sumin Kang, Jiuk Shin, Kihak Lee","doi":"10.9798/kosham.2023.23.6.1","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.1","url":null,"abstract":"This study rigorously assessed the structural performance of the wall frame system through a combination of experimentation and simulation under cyclic loading. Hence, three distinct specimens were developed: the original frame (referred to as the “as-built frame”), the retrofitted frame with ENTA damper system (referred to as “ENTA-W”), and the retrofitted frame with both ENTA damper system and steel frame (referred to as “ENTA-WR’). The experimental findings revealed that the retrofitted frames outperformed the as-built frame regarding energy dissipation ability, initial stiffness, and maximum load capacity. A detailed analysis and comparison between experimental and finite element analysis results were conducted. Notably, disparities between the experimental and analytical outcomes were lower than or near five percent regarding energy dissipation capacity, initial stiffness, and maximum strength. Moreover, the anticipated failure pattern of the concrete section and the stress distribution of the reinforcing bar closely mirrored those observed in the experiment.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":" 1118","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139136456","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}
{"title":"A Study on the Statistical Analysis and Artificial Intelligence Model to Improve the Reliability of Safety Inspection","authors":"Sung Jong Lee, Joo Ha Lee","doi":"10.9798/kosham.2023.23.6.269","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.269","url":null,"abstract":"In this study, safety diagnosis results from underground and nuclear power plant structures were collected to evaluate the reliability of on-site structural safety assessments. The analysis of these results revealed a discrepancy between the compressive strength determined by rebound hardness and the core compressive strength, with the former typically being evaluated higher than the latter. Additionally, existing strength prediction models did not adequately explain field data, whereas artificial intelligence models, particularly the support vector machine model, demonstrated improved accuracy and reduced error rates. This indicated the superior performance of support vector machine models in this context.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"15 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139129960","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}
{"title":"Impact of Disaster on Household Expenditures Using a Difference-in-Difference Analysis","authors":"Mijin Choo, Dong Keun Yoon","doi":"10.9798/kosham.2023.23.6.91","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.91","url":null,"abstract":"This study investigates the impact of the 2012 typhoon on household consumption expenditures in South Korea using a difference-indifferences model. We analyzed the changes in household consumption expenditures based on the extent and severity of disaster damage. Additionally, how these impacts vary depending on the employment status of the household head and the household’s income quartile was explored. The findings indicate that households experiencing disaster damage tend to reduce their consumption expenditures compared to unaffected households. Notably, households in the lowest income quintile and those with heads engaged in temporary or self-employment experience more significant declines. These research findings provide valuable insights for shaping future policies aimed at supporting household recovery and effectively directing post-disaster assistance resources.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"74 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130314","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}
{"title":"Design Prediction Equation for Plant Facilities: A Study Using the Pool Fire Radiant Heat Flux Estimation Method","authors":"Byeong-Heun Lee, Dong-In Park, Chan-Sol Ahn","doi":"10.9798/kosham.2023.23.6.229","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.229","url":null,"abstract":"This study derived a range of results based on all variables corresponding to a prediction formula for wind and wind-free conditions proposed by fire dynamics tools (FDTs), to estimate the radiant heat flux generated by pool fires. A method using standard deviation was employed to enable a design based on a designer's judgment. A value reflecting a standard deviation of 0.85 times the average value of the regression equation was proposed as a design prediction equation. This proposal was validated through calculations comparing the results with that of a large-scale pool fire experiment presented in the existing literature, to examine the applicability of the equation.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"98 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139131832","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}
Gihoon Moon, Seung Yeon Lee, Jin Kyung Yu, Doosun Kang, Do Guen Yoo
{"title":"Cluster Analysis to Identify Priority Areas for Water Quality Management in Water Supply Systems","authors":"Gihoon Moon, Seung Yeon Lee, Jin Kyung Yu, Doosun Kang, Do Guen Yoo","doi":"10.9798/kosham.2023.23.6.249","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.249","url":null,"abstract":"Zoning methodologies, such as district metered areas (DMA), are commonly employed to robustly maintain water pipe network systems in both normal and abnormal situations. However, the management and evaluation typically associated with existing DMAs primarily focus on ensuring stable water volume and pressure. Consequently, these methods do not adequately address the maintenance of water quality elements within the water supply system, such as adequately managing residual chlorine and reducing water quality complaints. This study introduced a zoning tailored explicitly for managing water quality-oriented elements, facilitating stable water quality management, and enhancing responses to water quality incidents in large-scale domestic water supply networks. A method was proposed to establish priorities for each zone, using various geographic information system (GIS)-based water quality-related structured data (such as water quality measurement data and pipe data) and unstructured data (such as water quality complaints). Comprehensive water quality management was achieved by applying machine learning techniques based on clustering analysis to derive evaluation factors. The proposed methodology was implemented in Metropolitan City A in Korea, leading to the derivation and analysis of evaluation results. This data-centric water supply network priority management area designation methodology, as presented in this study, is anticipated to serve as a valuable decision-making tool for enhancing the accuracy and reliability of water supply network operation and the overall management of water supply operators.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"82 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132080","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}
{"title":"Analyzing Debris Flow: Topographical Data and Discharge Rate Study","authors":"Namgyun Kim, Byonghee Jun","doi":"10.9798/kosham.2023.23.6.123","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.123","url":null,"abstract":"This study used an unmanned aerial vehicle (UAV) for aerial photogrammetry at the Seonseri debris flow site in Gokseong-gun, triggered by heavy rainfall in August 2020. Survey data facilitated the generation of orthographic images and high-resolution digital surface mode (DSM). Finite difference method (FDM) numerical analysis simulated debris flow, exploring the impact of discharge rate and topographic data among input variables. Applying the rational formula for determining debris flow discharge rate emphasized the significance of maximum rainfall intensity just before the event, with high estimated values for runoff coefficient and soil concentration. The study highlighted significant variations in debris flow simulation results based on topographical data accuracy, emphasizing the crucial role of precise site-specific topographical data.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"3 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139135594","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}
Jin Kyung Yu, Seung Yeon Lee, Byeong Heon On, Tae Min Jeon, Do Guen Yoo
{"title":"Developing a Methodology to Establish Response Zones based on Travel Time for Controlling the Spread of Water Quality Incidents in Water Supply Systems","authors":"Jin Kyung Yu, Seung Yeon Lee, Byeong Heon On, Tae Min Jeon, Do Guen Yoo","doi":"10.9798/kosham.2023.23.6.243","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.243","url":null,"abstract":"Water quality issues may arise within the water pipe network system due to external contamination from water leaks, aging pipes leading to damage, and the presence of suspended sediments resulting from changes in hydraulic direction. Promptly addressing these water quality problems during the supply process is crucial, as delays can swiftly escalate health risks for residents and cause economic damage to the region. Therefore, developing control techniques is imperative to minimize the rapid dissemination of accidents. This study aims to proactively identify and calculate the spread pattern of water quality incidents within the pipe network, utilizing residence time as a critical factor. A practical and efficient spread control zoning methodology was proposed to curtail the expansion of accidents. Applying the proposed methodology to the pipe network system in Cty A (Korea) involved quantitative analysis of newly defined areas based on the target residence time intended for practical management and control during water quality accidents. The results of the analysis demonstrate that the proposed method offers the potential to establish a novel concept of a response area for rapid reactions to water quality incidents. This facilitates the design of a zone centered around valves essential for crisis response, thereby creating an area with precise control over the spread of water quality accidents within a target response time.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":" 650","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139136680","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}
{"title":"Study on a Complementary Method to Address the Limitation of Smoke Detectors: Focusing on Carbon Monoxide Sensors","authors":"Young Min Shin, You-Ri Lim, Bong Jun Kim, D. Han","doi":"10.9798/kosham.2023.23.6.199","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.199","url":null,"abstract":"To compensate for the limitations of smoke detectors that frequently emit non-fire alarms, we investigated the carbon-monoxide detection characteristics of smoke detectors using UL 268 fire and non-fire test standards. Large amounts of carbon monoxide were generated during incomplete combustion at the beginning of a fire. Relatively low concentrations of carbon monoxide were also generated under non-fire conditions owing to steam, dust, etc. The response characteristics of general and analog smoke detectors from various manufacturers were analyzed to determine the possibility of linking smoke detectors installed in existing buildings. The experiments revealed that the smoke detectors showed similar reaction characteristics regardless of their manufacturer. However, those equipped with self-made carbon monoxide cross-sensing modules detected different carbon monoxide levels depending on the measurement location or method. Although using a carbon monoxide sensor is effective for distinguishing unwanted fire, additional experiments under various conditions are necessary to establish an appropriate detection range for carbon monoxide based on the response characteristics of the sensor.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":" 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139136263","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}
{"title":"A Study on Establishing Procedures and Display Design for the Development of the Disaster Management System using Satellite Imagery","authors":"Sangmin Lee, Yeoju Jang","doi":"10.9798/kosham.2023.23.6.111","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.111","url":null,"abstract":"Recently, the escalating occurrence of disasters with abnormal characteristics poses challenges to disaster management. As a result, effective disaster management and response strategies have become crucial. In this study, the disaster management system using satellite imagery was developed and constructed as a dashboard. For this study, the National Disaster Management Information System (NDMS) of the Ministry of the Interior and Safety (MOIS) was analyzed. Crisis management activities were examined in accordance with the disaster phase of the crisis management standard manual. Relevant components from the integrated multisource data in NDMS were selected to enhance technology effectiveness. A disaster management officer's requirements were analyzed to improve user usability. Disaster response procedures using satellite imagery were derived by synthesizing this information. Based on these procedures, key elements and system procedures were established for system design and visualization, and the system display was presented. The technology was proactively developed for immediate implementation after establishing legal and institutional procedures. Utilizing satellite imagery in the disaster management system is expected to enhance prompt and efficient disaster management.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"52 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139130812","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}
{"title":"Proposal for Real-time Quality Control Method to Enhance Hydrological Application of Radar Rainfall","authors":"Jungsoo Yoon, Seok-Hwan Hwang, Narae Kang","doi":"10.9798/kosham.2023.23.6.101","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.6.101","url":null,"abstract":"The primary aim of a rain radar is to observe ground-level rainfall accurately. Effective quality control of rain radar data is necessary to ensure accuracy. In the field of hydrology, various methods have been employed to improve the quality of radar rainfall by correcting or synthesizing it with gauge rainfall. However, it is more important to enhance the quality of radar polarimetric variables in order to improve the quality of radar rainfall. Rain radar systems generate various polarimetric variables through complex radar hardware systems and signal processing algorithms. Measurement errors may arise from equipment abnormalities, inappropriate operating settings, and obstructions in observation during signal processing algorithms and production process of polarimetric variables. Because rain radar is an observation device operating in real time, it entails more frequent and continuous quality control compared to flowmeters that intermittently measure streamflow. This study introduces a series of real-time quality control methods tailored for rain radar, including inspection of radar rainfall accuracy, quality analysis of polarimetric variables (ρHV, ZDR, ΦDP), error estimation of polarimetric variables, and long-term variability of errors.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"69 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139132398","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}