Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.143
Geonhyeok Bang, Jaehoon Lee, Gwanghee Heo, S. Seo, S. Jeon
In several mountainous areas in Korea, the number of small-scale storage facilities are on the rise. The safety of the opening and closing devices of sluice gates used in storage facilities is important. Recently, during the opening and closing of a water gate that used hydraulic pressure, sagging had occurred owing to the loss of hydraulic pressure over time. To solve the sagging problem of the water gate, a hydraulic loss prevention fixing device is used. The purpose of this study is to induce the safety design of a water gate through a theoretical and numerical review of the safety of a fixing device of the water gate. First, to theoretically secure the stability of the water gate fixing device, the fixing device was simplified and analyzed using the transformed-section method considering its cross-sectional height. In addition, the simplified fixing device assumed the point conditions according to the connection type, and the maximum deflection occurring in the fixing device was calculated considering the cross section conversion under the condition of the load acting on it. Through this structural analysis, the maximum deflection problem and stress generated in the fixing device were confirmed, and the safety of the fixing device was assessed to present its safety standard. The FE numerical analysis performed for comparative verification was interpreted as a condition of linear elasticity of isotropy in the fixing device. Consequently, a safety design method for the pump-type water gate fixing device was presented through the theoretical and numerical verification for securing its safety.
{"title":"Safety Evaluation of Hinged Pump-Type Water Gate Fixing Device","authors":"Geonhyeok Bang, Jaehoon Lee, Gwanghee Heo, S. Seo, S. Jeon","doi":"10.9798/kosham.2023.23.4.143","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.143","url":null,"abstract":"In several mountainous areas in Korea, the number of small-scale storage facilities are on the rise. The safety of the opening and closing devices of sluice gates used in storage facilities is important. Recently, during the opening and closing of a water gate that used hydraulic pressure, sagging had occurred owing to the loss of hydraulic pressure over time. To solve the sagging problem of the water gate, a hydraulic loss prevention fixing device is used. The purpose of this study is to induce the safety design of a water gate through a theoretical and numerical review of the safety of a fixing device of the water gate. First, to theoretically secure the stability of the water gate fixing device, the fixing device was simplified and analyzed using the transformed-section method considering its cross-sectional height. In addition, the simplified fixing device assumed the point conditions according to the connection type, and the maximum deflection occurring in the fixing device was calculated considering the cross section conversion under the condition of the load acting on it. Through this structural analysis, the maximum deflection problem and stress generated in the fixing device were confirmed, and the safety of the fixing device was assessed to present its safety standard. The FE numerical analysis performed for comparative verification was interpreted as a condition of linear elasticity of isotropy in the fixing device. Consequently, a safety design method for the pump-type water gate fixing device was presented through the theoretical and numerical verification for securing its safety.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125632578","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.11
Jaewoong Sim, Gi-Hyoug Cho
The concept of disaster response routes for damage reduction has emerged owing to recent large-scale earthquakes. Disaster response routes play an important role in the initial disaster response and recovery by evacuating populations and transferring supplies for disaster response. This study estimated the importance of each road that can be used as a disaster response route after the outbreak of disaster from the viewpoint of disaster resilience and network centrality and developed six types of priority indexes for road recovery based on the purpose of disaster recovery and the function of the disaster response route. Using these priority indexes developed in this study, critical roads for disaster recovery can be identified in short- and long-term periods. Disaster recovery is assumed to improve if disaster response routes are promptly assigned and restored based on these priority indexes.
{"title":"Development of a Disaster-resilience-based Priority Index Assessment Model for Road Recovery","authors":"Jaewoong Sim, Gi-Hyoug Cho","doi":"10.9798/kosham.2023.23.4.11","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.11","url":null,"abstract":"The concept of disaster response routes for damage reduction has emerged owing to recent large-scale earthquakes. Disaster response routes play an important role in the initial disaster response and recovery by evacuating populations and transferring supplies for disaster response. This study estimated the importance of each road that can be used as a disaster response route after the outbreak of disaster from the viewpoint of disaster resilience and network centrality and developed six types of priority indexes for road recovery based on the purpose of disaster recovery and the function of the disaster response route. Using these priority indexes developed in this study, critical roads for disaster recovery can be identified in short- and long-term periods. Disaster recovery is assumed to improve if disaster response routes are promptly assigned and restored based on these priority indexes.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121049243","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.79
Kyeong-Hwan Kang, S. Chae, Jisun You
With the increasing size and density of domestic buildings, the spread of fire from one building to adjacent ones has become a significant concern, leading to greater fire damage. The openings in these buildings have been identified as the main cause of horizontal and vertical fire diffusion, as flames repeatedly enter adjacent compartments. In this study, we focused on buildings with a high fire risk by conducting a fire risk assessment of existing structures. Commercial facilities (such as accommodation facilities) and industrial facilities (including warehouses and factories) were classified as buildings with a relatively high risk. We specifically selected PVC and AL windows, which are commonly used in buildings, to evaluate the risk of fire spread based on flame retardant assessment. However, during a fire, the exposed cross-section and quality of windows differ, making it inappropriate to evaluate their fire risk using the currently regulated flame retardant assessment test. Therefore, there is a need to establish methods and standards for flame retardant assessment tests that are specifically designed for windows.
{"title":"Study of the Combustion Characteristics and Flame Retardant Assessment of Windows in Buildings","authors":"Kyeong-Hwan Kang, S. Chae, Jisun You","doi":"10.9798/kosham.2023.23.4.79","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.79","url":null,"abstract":"With the increasing size and density of domestic buildings, the spread of fire from one building to adjacent ones has become a significant concern, leading to greater fire damage. The openings in these buildings have been identified as the main cause of horizontal and vertical fire diffusion, as flames repeatedly enter adjacent compartments. In this study, we focused on buildings with a high fire risk by conducting a fire risk assessment of existing structures. Commercial facilities (such as accommodation facilities) and industrial facilities (including warehouses and factories) were classified as buildings with a relatively high risk. We specifically selected PVC and AL windows, which are commonly used in buildings, to evaluate the risk of fire spread based on flame retardant assessment. However, during a fire, the exposed cross-section and quality of windows differ, making it inappropriate to evaluate their fire risk using the currently regulated flame retardant assessment test. Therefore, there is a need to establish methods and standards for flame retardant assessment tests that are specifically designed for windows.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114228246","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.43
Sohyun Choi, H. Jun, Dongyeop Lee, S. Hwang, Jong-Pyo Park
As climate change accelerates, the scale and intensity of natural disasters are increasing, and the frequency of localized heavy rains is increasing rapidly. Urban watersheds have a high ratio of impervious areas. So there is a high possibility of flooding in the event of torrential rain, and large-scale damage can occur because the population and material resources are highly concentrated. River improvements, sewerage maintenance, and rainwater storage installations are frequently used to reduce flood damage. More recently, low-impact development (LID) techniques have been proposed; however, LID facilities are installed on a small scale and in various locations. In addition, they require many parameters for a rainfall-runoff analysis; consequently, the design of these facilities require too much manpower and time. In this study, we analyze the rainfall-runoff reduction effect based on the size of a facility to present a simpler, more efficient design method. Next, the curve number (CN) corresponding to the capacity of each facility is estimated and the correlation between the facility’s area ratio and the CN is analyzed. As a result, a relational expression that can calculate the new CN with the same rainfall-runoff reduction effect as the installed LID facility was derived by using the CN before the installation of the LID facility and the facility area ratio. Thus, we present a simple design method using the recalculated CN without directly entering LID facilities into a storm water management model (SWMM).
{"title":"Development of a Simple Design Method for an Infiltration Facility using Curve Number","authors":"Sohyun Choi, H. Jun, Dongyeop Lee, S. Hwang, Jong-Pyo Park","doi":"10.9798/kosham.2023.23.4.43","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.43","url":null,"abstract":"As climate change accelerates, the scale and intensity of natural disasters are increasing, and the frequency of localized heavy rains is increasing rapidly. Urban watersheds have a high ratio of impervious areas. So there is a high possibility of flooding in the event of torrential rain, and large-scale damage can occur because the population and material resources are highly concentrated. River improvements, sewerage maintenance, and rainwater storage installations are frequently used to reduce flood damage. More recently, low-impact development (LID) techniques have been proposed; however, LID facilities are installed on a small scale and in various locations. In addition, they require many parameters for a rainfall-runoff analysis; consequently, the design of these facilities require too much manpower and time. In this study, we analyze the rainfall-runoff reduction effect based on the size of a facility to present a simpler, more efficient design method. Next, the curve number (CN) corresponding to the capacity of each facility is estimated and the correlation between the facility’s area ratio and the CN is analyzed. As a result, a relational expression that can calculate the new CN with the same rainfall-runoff reduction effect as the installed LID facility was derived by using the CN before the installation of the LID facility and the facility area ratio. Thus, we present a simple design method using the recalculated CN without directly entering LID facilities into a storm water management model (SWMM).","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"682 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131970207","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.87
Jihun Ko, Woochang Kim, Hakjoo Kim, Nak-seok Kim
In recent years, rapid urbanization and overcrowding have led to the construction of apartment buildings as a means of optimizing land utilization and providing residential facilities. However, among the firefighting facilities installed in these apartments, there is often a lack of automatic sprinklers or fire extinguishing devices in kitchens, particularly in older buildings. This absence of firefighting equipment makes it challenging to extinguish or control fires in their initial stages. To effectively reduce the occurrence of fires in apartment buildings, this study analyzed apartment fire incidents from 2015 to 2021 using the National Fire Data System of the National Fire Service. The analysis revealed that out of a total of 33,807 fires in multi-unit dwellings, 20,236 (59.9%) occurred in apartments. Consequently, there is a need for institutional improvements, as well as increased safety awareness among residents living in apartments and proactive engagement from facility managers.
{"title":"Analysis and Improvement of the Fire Incidents in Apartment Houses","authors":"Jihun Ko, Woochang Kim, Hakjoo Kim, Nak-seok Kim","doi":"10.9798/kosham.2023.23.4.87","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.87","url":null,"abstract":"In recent years, rapid urbanization and overcrowding have led to the construction of apartment buildings as a means of optimizing land utilization and providing residential facilities. However, among the firefighting facilities installed in these apartments, there is often a lack of automatic sprinklers or fire extinguishing devices in kitchens, particularly in older buildings. This absence of firefighting equipment makes it challenging to extinguish or control fires in their initial stages. To effectively reduce the occurrence of fires in apartment buildings, this study analyzed apartment fire incidents from 2015 to 2021 using the National Fire Data System of the National Fire Service. The analysis revealed that out of a total of 33,807 fires in multi-unit dwellings, 20,236 (59.9%) occurred in apartments. Consequently, there is a need for institutional improvements, as well as increased safety awareness among residents living in apartments and proactive engagement from facility managers.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116130261","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.197
Jeongho Oh, Seo Yeon Kim, Jae-Pil Paeng
To establish an integrated railroad network in the Korean Peninsula, in preparation for the unification era presented in the 3rd National Rail Network Construction Plan (2016–2025) and the Railroad Industry Development Basic Plan, a preemptive response to construct railroad infrastructure considering the low temperature in North Korea during winter is essential. In this study, extensive numerical analyses were conducted to evaluate the behavior of railroad bridge foundations while accounting for the climate and geological conditions of North Korea. Furthermore, we proposed additional items that need to be addressed in the current railroad roadbed design standards. Eventually, we found that taking measures, such as application of insulation, to alleviate frost damage due to the increase in the adfreezing strength of railroad bridge foundations in cold regions where the freezing index is more than 1,000 ℃ day is necessary.
{"title":"Evaluation of Railroad Bridge Foundation Response to Insulation Application under Cold Regions","authors":"Jeongho Oh, Seo Yeon Kim, Jae-Pil Paeng","doi":"10.9798/kosham.2023.23.4.197","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.197","url":null,"abstract":"To establish an integrated railroad network in the Korean Peninsula, in preparation for the unification era presented in the 3rd National Rail Network Construction Plan (2016–2025) and the Railroad Industry Development Basic Plan, a preemptive response to construct railroad infrastructure considering the low temperature in North Korea during winter is essential. In this study, extensive numerical analyses were conducted to evaluate the behavior of railroad bridge foundations while accounting for the climate and geological conditions of North Korea. Furthermore, we proposed additional items that need to be addressed in the current railroad roadbed design standards. Eventually, we found that taking measures, such as application of insulation, to alleviate frost damage due to the increase in the adfreezing strength of railroad bridge foundations in cold regions where the freezing index is more than 1,000 ℃ day is necessary.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126844711","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.1
Sehee Hong, Ohseong Lee, Ho-Jin Lee, Y. Yoon
Lightweight structures have garnered the attention of many researchers for their cost effectiveness and overall design reduction. Cement composites can secure their lightness by incorporating lightweight materials. However, lightweight material has low resistance to external forces. To overcome this disadvantage and achieve high-strength lightweight cement composites (HSLCC), incorporation of 0.05 wt.% carbon nanotubes was considered. In this study, we evaluate the flexural performance of reinforced HSLCC beams with carbon nanotubes considering three tensile reinforcement ratios and two shear span to depth ratios. As the flexural reinforcement ratio increased, the ductility of the specimens decreased. However, specimens 0.8-3.6, 1.3-3.6, and 1.9-3.6 satisfied the minimum ductility index and secured shear performance. The domestic design standards evaluated the flexural strength conservatively for reinforced HSLCC with carbon nanotubes.
{"title":"Evaluation of Flexural Strength of High-Strength Lightweight Cement Composites containing Carbon Nanotubes","authors":"Sehee Hong, Ohseong Lee, Ho-Jin Lee, Y. Yoon","doi":"10.9798/kosham.2023.23.4.1","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.1","url":null,"abstract":"Lightweight structures have garnered the attention of many researchers for their cost effectiveness and overall design reduction. Cement composites can secure their lightness by incorporating lightweight materials. However, lightweight material has low resistance to external forces. To overcome this disadvantage and achieve high-strength lightweight cement composites (HSLCC), incorporation of 0.05 wt.% carbon nanotubes was considered. In this study, we evaluate the flexural performance of reinforced HSLCC beams with carbon nanotubes considering three tensile reinforcement ratios and two shear span to depth ratios. As the flexural reinforcement ratio increased, the ductility of the specimens decreased. However, specimens 0.8-3.6, 1.3-3.6, and 1.9-3.6 satisfied the minimum ductility index and secured shear performance. The domestic design standards evaluated the flexural strength conservatively for reinforced HSLCC with carbon nanotubes.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114716656","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.207
S. Shin, J. Lim, Kyunghun Kim, H. Kim
In recent years, flood damage resulting from continuous rainfall events has been on the rise. However, existing Emergency Action Plans (EAPs) addressing reservoir or dam failure only consider Probable Maximum Precipitation (PMP), which represents a single rainfall event. This study aims to address this limitation by simulating a dam break scenario caused by continuous rainfall events. The Chungju dam watershed was selected as the study area and a mega rainfall event scenario, involving continuous 500-year frequency rainfall intensity events, was defined. Next, the flood discharge resulting from the mega rainfall event scenario was estimated using the Consecutive Storm Event Based (ConSEB) model. The Simplified Dam Break (SMPDBK) model was employed to simulate the dam break. The flood discharge estimated for this scenario amounted to 31,080.34 cms, which is about 1.2 times larger than the Probable Maximum Flood (PMF). The dam break water level simulated by the SMPDBK model was 150 m and the flood damage area was estimated to be 307.45 km2. Based on the results of the study, we highlighted the need to consider continuous rainfall events within EAPs.
{"title":"A Study on Dam Break Simulation considering Continuous Rainfall Events","authors":"S. Shin, J. Lim, Kyunghun Kim, H. Kim","doi":"10.9798/kosham.2023.23.4.207","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.207","url":null,"abstract":"In recent years, flood damage resulting from continuous rainfall events has been on the rise. However, existing Emergency Action Plans (EAPs) addressing reservoir or dam failure only consider Probable Maximum Precipitation (PMP), which represents a single rainfall event. This study aims to address this limitation by simulating a dam break scenario caused by continuous rainfall events. The Chungju dam watershed was selected as the study area and a mega rainfall event scenario, involving continuous 500-year frequency rainfall intensity events, was defined. Next, the flood discharge resulting from the mega rainfall event scenario was estimated using the Consecutive Storm Event Based (ConSEB) model. The Simplified Dam Break (SMPDBK) model was employed to simulate the dam break. The flood discharge estimated for this scenario amounted to 31,080.34 cms, which is about 1.2 times larger than the Probable Maximum Flood (PMF). The dam break water level simulated by the SMPDBK model was 150 m and the flood damage area was estimated to be 307.45 km2. Based on the results of the study, we highlighted the need to consider continuous rainfall events within EAPs.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126589460","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.167
Jae Hyuk Lee, Jeong Jun Park, Hyun Oh Shin, Hyungchul Yoon
Recently, railway maintenance has been receiving significant attention to prevent railway accidents. Accordingly, various methods are being developed that apply IT to railroad maintenance, and digital models can be used for an efficient management. To develop a railroad digital model, current status information of the rail is required. However, the existing method consumes considerable time and cost. Therefore, in this study, we proposed a system to scan the railroad using a UAV and automatically detect the rail using PointNet++. The proposed system consisted of Phase 1 (structure from motion) and Phase 2 (rail detection). To verify the performance of the proposed system, the railroad bridge of the Osong test track in Nojang-ri, Jeondong-myeon, Sejong City, South Korea, was targeted. The proposed system is expected to be utilized in various fields such as damage detection, simulation, predictive maintenance, and efficient operation management.
{"title":"Automatic Rail Detection Technology Based on PointNet++ Using 3D Point Cloud Data of Railway Bridges","authors":"Jae Hyuk Lee, Jeong Jun Park, Hyun Oh Shin, Hyungchul Yoon","doi":"10.9798/kosham.2023.23.4.167","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.167","url":null,"abstract":"Recently, railway maintenance has been receiving significant attention to prevent railway accidents. Accordingly, various methods are being developed that apply IT to railroad maintenance, and digital models can be used for an efficient management. To develop a railroad digital model, current status information of the rail is required. However, the existing method consumes considerable time and cost. Therefore, in this study, we proposed a system to scan the railroad using a UAV and automatically detect the rail using PointNet++. The proposed system consisted of Phase 1 (structure from motion) and Phase 2 (rail detection). To verify the performance of the proposed system, the railroad bridge of the Osong test track in Nojang-ri, Jeondong-myeon, Sejong City, South Korea, was targeted. The proposed system is expected to be utilized in various fields such as damage detection, simulation, predictive maintenance, and efficient operation management.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127008772","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}
Pub Date : 2023-08-31DOI: 10.9798/kosham.2023.23.4.103
Jaehee Cha, Dae-Hoon Kwak, Wangyoul Ko
Volunteer firefighters receive regular education or training to allow them to provide a suitable response in case of disasters such as social disasters. However, volunteer firefighters are limited to assisting the work of firefighters but are not involved in active duty. Therefore, this study examines the current status of volunteer firefighters and conducts and analyzes satisfaction surveys through questionnaires. Volunteer firefighters undergo regular education and training. Because they have long-term residence in the region as well as expertise, their services should be actively utilized in the field of disaster prevention and response. Moreover, because the satisfaction level of the convocation allowance is low, it is necessary to make the recruitment allowance realistic. The ratio of personnel working in firefighting and technology-related fields is low; thus, it is necessary to expand and allocate practical firefighting-related subjects during education and training. Through this, it is judged that the satisfaction of volunteer firefighters can be increased and the organization can be actively utilized in the case of a disaster to provide more help to the country and the people.
{"title":"Job Satisfaction of Volunteer Firefighters in Daejeon","authors":"Jaehee Cha, Dae-Hoon Kwak, Wangyoul Ko","doi":"10.9798/kosham.2023.23.4.103","DOIUrl":"https://doi.org/10.9798/kosham.2023.23.4.103","url":null,"abstract":"Volunteer firefighters receive regular education or training to allow them to provide a suitable response in case of disasters such as social disasters. However, volunteer firefighters are limited to assisting the work of firefighters but are not involved in active duty. Therefore, this study examines the current status of volunteer firefighters and conducts and analyzes satisfaction surveys through questionnaires. Volunteer firefighters undergo regular education and training. Because they have long-term residence in the region as well as expertise, their services should be actively utilized in the field of disaster prevention and response. Moreover, because the satisfaction level of the convocation allowance is low, it is necessary to make the recruitment allowance realistic. The ratio of personnel working in firefighting and technology-related fields is low; thus, it is necessary to expand and allocate practical firefighting-related subjects during education and training. Through this, it is judged that the satisfaction of volunteer firefighters can be increased and the organization can be actively utilized in the case of a disaster to provide more help to the country and the people.","PeriodicalId":416980,"journal":{"name":"Journal of the Korean Society of Hazard Mitigation","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133612939","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}
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