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With the advent of the 4th Industrial Revolution, advanced measurement infrastructure and utilization technologies are being noticeably introduced into the water supply system to store and utilize measurement data. From this perspective, the leak detection technology in water supply networks is becoming increasingly vital to sustainable water resource management and the clean water supply worldwide. In particular, leakage detection of buried pipelines is rated as a very challenging research topic given the current level of technology. However, leakage in buried underground pipelines is rated as a very challenging research topic given the current level of technology. Therefore, a data-driven leak detection model was developed through this study using deep learning technology based on inflow meter data. Multiple threshold-based models were applied to reduce the RNN-LSTM (Recurrent Neural Networks–Long Short-Term Memory models) deep learning and false prediction range, which is programmed in conjunction with the Python language and Google Colaboratory (a big data analysis tool). The developed model consists of flow pattern shape extraction, RNN-LSTM-based flow prediction, and threshold setting modules. The developed model was applied to the actual leakage accident data, followed by the performance evaluation. As a result, the leak was recognized at most points immediately after the accident. The performance of leak detection was evaluated by a Confusion matrix and showed more than 90% accuracy at all points except singularities. Therefore, the developed model can be used as a critical software technology to proactively identify various at present with smart water infrastructure being introduced. In addition, this model is highly scalable as it can consider various operational situations based on the expert system, and it can also efficiently reflect the results of pipe network analysis across different scenarios.
Chan-Wook Lee; Do-Guen Yoo. Development of Leakage Detection Model and Its Application for Water Distribution Networks Using RNN-LSTM. Sustainability 2021, 13, 9262 .
AMA StyleChan-Wook Lee, Do-Guen Yoo. Development of Leakage Detection Model and Its Application for Water Distribution Networks Using RNN-LSTM. Sustainability. 2021; 13 (16):9262.
Chicago/Turabian StyleChan-Wook Lee; Do-Guen Yoo. 2021. "Development of Leakage Detection Model and Its Application for Water Distribution Networks Using RNN-LSTM." Sustainability 13, no. 16: 9262.
It is critical to prepare appropriate responses and countermeasures against droughts caused by a complex hazard process as the range of its damage and duration are very large. In this study, 160 local governments in Korea evaluated drought resilience. A total of 18 qualitative and quantitative drought recovery indicators were selected to collect and analyze data from each region. Comparative analysis of indicators through regional drought assessment was conducted to derive results and present directions for enhancing resilience. Lastly, a resilience curve of drought that can utilize the results of the evaluation was suggested and applied to the actual region, and the results were analyzed. The proposed method can be expected to be used as a basic and essential resources to prepare various local government measures against drought.
Chan-Wook Lee; Do-Guen Yoo. Evaluation of Drought Resilience Reflecting Regional Characteristics: Focused on 160 Local Governments in Korea. Water 2021, 13, 1873 .
AMA StyleChan-Wook Lee, Do-Guen Yoo. Evaluation of Drought Resilience Reflecting Regional Characteristics: Focused on 160 Local Governments in Korea. Water. 2021; 13 (13):1873.
Chicago/Turabian StyleChan-Wook Lee; Do-Guen Yoo. 2021. "Evaluation of Drought Resilience Reflecting Regional Characteristics: Focused on 160 Local Governments in Korea." Water 13, no. 13: 1873.
Increasing climate change is causing complex and diverse natural disasters that have never been experienced before. Recently, research and practical applications of the concept of resilience at the management level for these disasters have been presented. Drought is one of the disasters that lasts for a long time and takes a considerable amount of time for recovery, and resilience evaluations reflecting regional characteristics are needed. In this study, we aim to present the applicability of the resilience concept that reflects regional characteristics (whether or not drought has been experienced in the past) in droughts. To this end, 18 qualitative and quantitative indicators for the evaluation of drought resilience were proposed by judging overseas cases, data status, and domestic applicability. A methodology for calculating the proposed indicators through quantitative data analysis and surveys was presented, and detailed drought resilience evaluations were conducted based on two regions in Korea (Chungcheongnam-do and Chungcheongbuk-do). Through the resilience evaluation using this methodology, the drought response capacity of each local government could be comprehensively evaluated from various perspectives, and each determined factors for improving drought resilience. If a nationwide evaluation is conducted in the future based on these results, locally appropriate guidelines related to drought response and recovery can be established.
Chan Wook Lee; Sungjin Hong; Gihoon Moon; Do Guen Yoo. A Study on Resilience Analysis for Regional Drought Capacity Evaluation in South Korea. Journal of the Korean Society of Hazard Mitigation 2021, 21, 181 -192.
AMA StyleChan Wook Lee, Sungjin Hong, Gihoon Moon, Do Guen Yoo. A Study on Resilience Analysis for Regional Drought Capacity Evaluation in South Korea. Journal of the Korean Society of Hazard Mitigation. 2021; 21 (3):181-192.
Chicago/Turabian StyleChan Wook Lee; Sungjin Hong; Gihoon Moon; Do Guen Yoo. 2021. "A Study on Resilience Analysis for Regional Drought Capacity Evaluation in South Korea." Journal of the Korean Society of Hazard Mitigation 21, no. 3: 181-192.
For reliable pressure-driven analysis (PDA) results, it is necessary to reasonably determine an objective head-outflow relationship (HOR) and the required head for each node. So far, no methodology has been proposed to objectively determine two factors based on data of real block. In this study, the HOR was defined using the water supply method, residential environment, and water consumption data within real blocks. The standard minimum residual pressure criteria were reviewed to quickly and rationally determine the required head for each node. To validate the proposed methodology, the HOR and required head application conditions were configured for different scenarios; the available flow rate of nodes and the water supply capacity of the entire block were evaluated based on PDA results. Through the results for each scenario, the HOR definition method was able to provide a reasonable result reflecting the actual block’s conditions, unlike the conventional orifice-type HOR, and the standard minimum residual pressure criteria as the required head was evaluated to be more efficient than the conventional time-consuming method. The HOR uncertainty and the lack of rationality in the selection of the required heads affected the reliability of PDA results; these problems can be solved using the proposed methodology.
Dong Chang; Do Yoo; Joong Kim. A Study on the Practical Pressure-Driven Hydraulic Analysis Method Considering Actual Water Supply Characteristics of Water Distribution Network. Sustainability 2021, 13, 2793 .
AMA StyleDong Chang, Do Yoo, Joong Kim. A Study on the Practical Pressure-Driven Hydraulic Analysis Method Considering Actual Water Supply Characteristics of Water Distribution Network. Sustainability. 2021; 13 (5):2793.
Chicago/Turabian StyleDong Chang; Do Yoo; Joong Kim. 2021. "A Study on the Practical Pressure-Driven Hydraulic Analysis Method Considering Actual Water Supply Characteristics of Water Distribution Network." Sustainability 13, no. 5: 2793.
In general, studies of the seismic reliability of water supply systems through hydraulic analysis models fall into three categories: (1) model development through hydraulic analysis, (2) establishment of post-earthquake recovery strategies, and (3) robust design in preparation for earthquakes and the development of improvement techniques. In this study, with regard to the design of earthquake resistance techniques, which is the third category, a seismic reliability assessment was conducted that considers the water supply system, and a plan to maximize the seismic reliability was determined as a result of the analysis. The degree of improvement in seismic reliability was quantified for water supply systems with various sources and water supply routes via modeling of seismic protection for each water supply route. Korea’s A industrial water system, which has a history of large-scale earthquakes, was divided into nine paths, and the reliability of the water supply system and the cost of earthquake resistance were calculated and compared between the different paths. A water supply path consists of a combination of pipes of various sizes and lengths, and the amount of water to be supplied differs between paths. Quantifying the effect of the water supply system and the seismic reliability of a route is intended to provide a basic methodology for identifying the critical path that should be the target of seismic protection when money and resources available for construction are limited. This methodology was used to confirm that the reliability of the water supply, the demand for water, and the cost of earthquake resistance should be considered together to establish an earthquake resistance strategy for the critical path in a water supply system. We expect that the results of this study will be used to establish detailed strategies for preliminary reinforcement against earthquake damage based on critical paths rather than all or individual pipelines in a water supply network.
Chan Wook Lee; Hyuk Jae Kwon; Do Guen Yoo. Seismic Reliability Assessment of Water Supply Systems Considering Critical Paths. Applied Sciences 2020, 10, 8056 .
AMA StyleChan Wook Lee, Hyuk Jae Kwon, Do Guen Yoo. Seismic Reliability Assessment of Water Supply Systems Considering Critical Paths. Applied Sciences. 2020; 10 (22):8056.
Chicago/Turabian StyleChan Wook Lee; Hyuk Jae Kwon; Do Guen Yoo. 2020. "Seismic Reliability Assessment of Water Supply Systems Considering Critical Paths." Applied Sciences 10, no. 22: 8056.
The seismic performance evaluation of water supply systems is generally conducted in two stages: a preliminary and a detailed evaluation process. In the case of water pipelines, the priority pipes are selected through preliminary evaluation for a detailed evaluation. However, as the preliminary seismic performance evaluation method for existing water pipes solely focuses on their installation year and structural evaluation, it does not reflect the hydraulic characteristics of the water supply, which is the main purpose of water pipes. Therefore, this study proposed an evaluation method for the existing preliminary evaluation judgment index, by considering the calculation method for the probability of spatial failure, as well as the index obtained through hydraulic analysis results. The proposed methodology was applied to a domestic regional water supply system to be verified, and the results were analyzed. The proposed method is expected to serve as a result of basic research to enhance the seismic performance evaluation method in the future.
Jeongwook Choi; Doosun Kang; Donghwi Jung; Chanwook Lee; Do Guen Yoo; Seong-Bae Jo. Development of Preliminary Seismic Performance Evaluation Method for Water Supply Pipes considering Hydraulic Characteristics. Journal of the Korean Society of Hazard Mitigation 2020, 20, 319 -327.
AMA StyleJeongwook Choi, Doosun Kang, Donghwi Jung, Chanwook Lee, Do Guen Yoo, Seong-Bae Jo. Development of Preliminary Seismic Performance Evaluation Method for Water Supply Pipes considering Hydraulic Characteristics. Journal of the Korean Society of Hazard Mitigation. 2020; 20 (5):319-327.
Chicago/Turabian StyleJeongwook Choi; Doosun Kang; Donghwi Jung; Chanwook Lee; Do Guen Yoo; Seong-Bae Jo. 2020. "Development of Preliminary Seismic Performance Evaluation Method for Water Supply Pipes considering Hydraulic Characteristics." Journal of the Korean Society of Hazard Mitigation 20, no. 5: 319-327.
The behavior of a slab-column joint subjected to blast loads was studied by numerical analysis using a general-purpose finite element analysis program, LS-DYNA. Under the explosive load, the joint region known as the stress disturbed zone was defined as a region with a scaled distance of 0.1 m/kg1/3 or less through comparison with ConWep’s empirical formula. Displacement and support rotation according to Trinitrotoluene (TNT) weight and scaled distance were investigated by dividing in and out of the joint region. In addition, fracture volume was newly proposed as an evaluation factor for blast-resistant performance, and it was confirmed that the degree of damage to a member due to blast loads was well represented by the fracture volume. Finally, a prediction equation for the blast-resistant performance of the slab-column joint was proposed, and the reliability and accuracy of the equation were verified through additional numerical analysis.
Kwang Mo Lim; Do Guen Yoo; Bo Yeon Lee; Joo Ha Lee. Prediction of Damage Level of Slab-Column Joints under Blast Load. Applied Sciences 2020, 10, 5837 .
AMA StyleKwang Mo Lim, Do Guen Yoo, Bo Yeon Lee, Joo Ha Lee. Prediction of Damage Level of Slab-Column Joints under Blast Load. Applied Sciences. 2020; 10 (17):5837.
Chicago/Turabian StyleKwang Mo Lim; Do Guen Yoo; Bo Yeon Lee; Joo Ha Lee. 2020. "Prediction of Damage Level of Slab-Column Joints under Blast Load." Applied Sciences 10, no. 17: 5837.
Achieving reliable pressure-driven analysis (PDA) results that account for anomalies within water-pipe networks requires a head-outflow relationship (HOR) model that can calculate supply flow rate according to the supply pressure at each node. Many studies have suggested HOR models, but a methodology to define HORs that considers the actual residential environment of users and differing water-supply methods for residential buildings has not yet been proposed. This study considered water-use data from buildings and actual differences in residential environments in a surveyed area (including building heights, topography, and water systems within buildings) and water-supply methods (indirect/direct water supply, existence of a pump within buildings) to develop a methodology and derive a representative HOR for the target area for PDA. Further, a representative HOR was determined for each block by applying the developed methodology for two blocks with similar residential environments but different water-use patterns. It confirmed that the HOR induced through this process could provide high water-supply performance despite a low supply head and needed to reflect the diversity of the water-supply method. The proposed HOR-definition methodology can be easily applied in water-pipe network design and operation processes and ensure objectivity and rationality of HOR selection to yield reliable PDA results.
Dong Eil Chang; Do Guen Yoo; Joong Hoon Kim. Practical Head-Outflow Relationship Definition Methodology That Accounts for Varied Water-Supply Methods. Sustainability 2020, 12, 1 .
AMA StyleDong Eil Chang, Do Guen Yoo, Joong Hoon Kim. Practical Head-Outflow Relationship Definition Methodology That Accounts for Varied Water-Supply Methods. Sustainability. 2020; 12 (11):1.
Chicago/Turabian StyleDong Eil Chang; Do Guen Yoo; Joong Hoon Kim. 2020. "Practical Head-Outflow Relationship Definition Methodology That Accounts for Varied Water-Supply Methods." Sustainability 12, no. 11: 1.
Recently, the signs of extreme droughts, which were thought of as exceptional and unlikely, are being detected worldwide. It is necessary to prepare countermeasures against extreme droughts; however, current definitions of extreme drought are just used as only one or two indicators to represent the status or severity of a drought. More representative drought factors, which can show the status and severity that are relevant to extreme drought, need to be considered depending on the characteristics of the drought and comprehensive evaluation of various indices. Therefore, this study attempted to quantitatively define regional extreme droughts using more acceptable factors. The methodology comprises five factors that are indicative of extreme drought. The five factors are (1) duration (days), (2) number of consecutive years (years), (3) water availability, (4) return period, and (5) regional experience. The results were analyzed by applying the procedure to droughts that took place in 2014–2015 in South Korea. The results showed that the applied historical event did not enter the status of extreme drought, which is proposed in this study; however, the proposed methodology is applicable because it uses acceptable and reasonable factors to judge extreme drought, but it can also take into account the past regional experience of extreme drought.
Chan Wook Lee; Moo Jong Park; Do Guen Yoo. Quantitative Determination Procedures for Regional Extreme Drought Conditions: Application to Historical Drought Events in South Korea. Atmosphere 2020, 11, 581 .
AMA StyleChan Wook Lee, Moo Jong Park, Do Guen Yoo. Quantitative Determination Procedures for Regional Extreme Drought Conditions: Application to Historical Drought Events in South Korea. Atmosphere. 2020; 11 (6):581.
Chicago/Turabian StyleChan Wook Lee; Moo Jong Park; Do Guen Yoo. 2020. "Quantitative Determination Procedures for Regional Extreme Drought Conditions: Application to Historical Drought Events in South Korea." Atmosphere 11, no. 6: 581.
Numerical and empirical studies of soil slurry transport and deposition in urban stormwater sewers are few, presumably due to the difficulty of direct observation of soil slurry flow in stormwater pipes. Slurry in a sewer system includes both suspended load and bedload, but few studies have attempted to demarcate these two components. A boundary layer is a crucial determinant of sediment transport capacity. Stormwater runoff enters the sewer in turbulent flow, mostly mixed with soil slurry generated by rainfall. In this paper, we attempt analysis using ANSYS Fluent commercial CFD software. We describe the development of a numerical analytical methodology capable of predicting the flow of soil slurry in stormwater pipes, and propose a method for estimating the sediment–flow boundary layer. Using this model, we simulated stormwater runoff with a large content of soil slurry during a rainfall event. We investigated soil slurry transport and predict the formation of shear boundary layer by varying the inlet conditions (volume of soil slurry entering the stormwater sewer system) and by analyzing the flow velocity field and soil slurry volume fraction in the pipes under various experimental flow conditions. Based on the shear and settling velocity of sediment particles, we propose criteria for the formation of a shear boundary layer in stormwater pipes.
Yang Ho Song; Jin Gul Joo; Jung Ho Lee; Do Guen Yoo. Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases. Water 2020, 12, 1332 .
AMA StyleYang Ho Song, Jin Gul Joo, Jung Ho Lee, Do Guen Yoo. Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases. Water. 2020; 12 (5):1332.
Chicago/Turabian StyleYang Ho Song; Jin Gul Joo; Jung Ho Lee; Do Guen Yoo. 2020. "Numerical Assessment of Shear Boundary Layer Formation in Sewer Systems with Fluid-Sediment Phases." Water 12, no. 5: 1332.
This study suggests a methodology for the decision of water quality measurement locations in order to identify water quality problems within a pipe network system under abnormal conditions. A water supply system conversion due to the occurrence of tank or pump problems between water supply zones was set as a possible abnormal scenario and the water flow direction sensitivity of the pipeline was quantified to estimate the water quality monitoring priority. The proposed methodology was applied to a new city, A, in South Korea, and the results are analyzed in detail and presented. The proposed methodology can be used as a method to select water quality monitoring points when establishing an operation plan for emergency link pipes. It is also expected that it can be applied in the evaluation of the adequacy of the previously established emergency link pipe operation plan.
Chan Wook Lee; Do Guen Yoo. Decision of Water Quality Measurement Locations for the Identification of Water Quality Problems under Emergency Link Pipe Operation. Applied Sciences 2020, 10, 2707 .
AMA StyleChan Wook Lee, Do Guen Yoo. Decision of Water Quality Measurement Locations for the Identification of Water Quality Problems under Emergency Link Pipe Operation. Applied Sciences. 2020; 10 (8):2707.
Chicago/Turabian StyleChan Wook Lee; Do Guen Yoo. 2020. "Decision of Water Quality Measurement Locations for the Identification of Water Quality Problems under Emergency Link Pipe Operation." Applied Sciences 10, no. 8: 2707.
The importance of water quality management in pipes has been recently highlighted through the "Red-water phenomenon" in the city of Incheon. This study proposed a methodology for determining the location of measuring instruments during abnormal water quality issues. The proposed method focuses on analyzing the sensitivity of the flow path through a pipe. Additionally, this flow sensitivity through the tube is analyzed by considering both normal and abnormal conditions. The sensitivity of a pipe is the rate at which the water-flow direction changes. Further, a tube with low sensitivity under normal conditions but high sensitivity under abnormal conditions is the pipe for which the instrument should be first installed. The results were analyzed by applying the proposed methodology to a conventional virtual network. It is expected that, in future, the proposed method for determining the location of water quality gauges could be a useful tool for determining the location of instruments during emergencies.
Chan Wook Lee; Yong Jun Lee; Ji Seung Park; Do Guen Yoo. Determination of the Sensor Placement for Detection Water Quality Problems in Water Supply Systems. Journal of the Korean Society of Hazard Mitigation 2020, 20, 299 -306.
AMA StyleChan Wook Lee, Yong Jun Lee, Ji Seung Park, Do Guen Yoo. Determination of the Sensor Placement for Detection Water Quality Problems in Water Supply Systems. Journal of the Korean Society of Hazard Mitigation. 2020; 20 (1):299-306.
Chicago/Turabian StyleChan Wook Lee; Yong Jun Lee; Ji Seung Park; Do Guen Yoo. 2020. "Determination of the Sensor Placement for Detection Water Quality Problems in Water Supply Systems." Journal of the Korean Society of Hazard Mitigation 20, no. 1: 299-306.
Seon Woo Kim; Min Ki Kim; Donghwi Jung; Do Guen Yoo. Identifying the Critical Drought Impact Factor with Feature Selection Approaches. Journal of Korean Society of Hazard Mitigation 2019, 19, 511 -518.
AMA StyleSeon Woo Kim, Min Ki Kim, Donghwi Jung, Do Guen Yoo. Identifying the Critical Drought Impact Factor with Feature Selection Approaches. Journal of Korean Society of Hazard Mitigation. 2019; 19 (7):511-518.
Chicago/Turabian StyleSeon Woo Kim; Min Ki Kim; Donghwi Jung; Do Guen Yoo. 2019. "Identifying the Critical Drought Impact Factor with Feature Selection Approaches." Journal of Korean Society of Hazard Mitigation 19, no. 7: 511-518.
Chan Wook Lee; Do Guen Yoo; Hwan Don Jun; Dong Eil Chang. Runoff Characteristics in Urban Drainage Systems Considering Secondary Consolidation Settlement. Journal of Korean Society of Hazard Mitigation 2019, 19, 393 -399.
AMA StyleChan Wook Lee, Do Guen Yoo, Hwan Don Jun, Dong Eil Chang. Runoff Characteristics in Urban Drainage Systems Considering Secondary Consolidation Settlement. Journal of Korean Society of Hazard Mitigation. 2019; 19 (7):393-399.
Chicago/Turabian StyleChan Wook Lee; Do Guen Yoo; Hwan Don Jun; Dong Eil Chang. 2019. "Runoff Characteristics in Urban Drainage Systems Considering Secondary Consolidation Settlement." Journal of Korean Society of Hazard Mitigation 19, no. 7: 393-399.
Chan Wook Lee; Donghwi Jung; Moo Jong Park; Do Guen Yoo. Application of Envelope Curve Method for Quantitative Definition of Extreme Drought Conditions. Journal of Korean Society of Hazard Mitigation 2019, 19, 245 -251.
AMA StyleChan Wook Lee, Donghwi Jung, Moo Jong Park, Do Guen Yoo. Application of Envelope Curve Method for Quantitative Definition of Extreme Drought Conditions. Journal of Korean Society of Hazard Mitigation. 2019; 19 (5):245-251.
Chicago/Turabian StyleChan Wook Lee; Donghwi Jung; Moo Jong Park; Do Guen Yoo. 2019. "Application of Envelope Curve Method for Quantitative Definition of Extreme Drought Conditions." Journal of Korean Society of Hazard Mitigation 19, no. 5: 245-251.
Chan Wook Lee; Do Guen Yoo. Scenario-Based Water Purification Plant LCC Analysis for Strategic Asset Management. Journal of Korean Society of Hazard Mitigation 2019, 19, 285 -292.
AMA StyleChan Wook Lee, Do Guen Yoo. Scenario-Based Water Purification Plant LCC Analysis for Strategic Asset Management. Journal of Korean Society of Hazard Mitigation. 2019; 19 (5):285-292.
Chicago/Turabian StyleChan Wook Lee; Do Guen Yoo. 2019. "Scenario-Based Water Purification Plant LCC Analysis for Strategic Asset Management." Journal of Korean Society of Hazard Mitigation 19, no. 5: 285-292.
The rainfall-runoff analysis model in urban watersheds should be constructed to establish flood damage countermeasures. The SWMM (Storm Water Management Model) is a representative model for rainfall-runoff analysis of urban watersheds. While this model is based on many parameters and provides relatively reliable results, it contains many ambiguous parameters. Therefore, parameter estimation is essential for rainfall-runoff analysis model and can be done using optimization algorithms. Harmony search algorithm is used to automatically estimate the parameters of the SWMM. Unlike the previous studies, the parameters are estimated by considering not only the inflow data but also the sewer level data. Parameter estimation is applied to the flood simulation on the catchment of Yongdap pump station basin, Seongdong-gu, Seoul, South Korea. The results estimated by supposed model are reliable in terms of both inflow and sewer level. The verification results of the calibrated model show the error within 5%, which are within the allowable error range.
Oseong Lim; Young Hwan Choi; Do Guen Yoo; Joong Hoon Kim. Parameter Estimation of Storm Water Management Model with Sewer Level Data in Urban Watershed. Advances in Intelligent Systems and Computing 2019, 70 -75.
AMA StyleOseong Lim, Young Hwan Choi, Do Guen Yoo, Joong Hoon Kim. Parameter Estimation of Storm Water Management Model with Sewer Level Data in Urban Watershed. Advances in Intelligent Systems and Computing. 2019; ():70-75.
Chicago/Turabian StyleOseong Lim; Young Hwan Choi; Do Guen Yoo; Joong Hoon Kim. 2019. "Parameter Estimation of Storm Water Management Model with Sewer Level Data in Urban Watershed." Advances in Intelligent Systems and Computing , no. : 70-75.
In this study, hydraulic procedures that can compensate problems in conventional model are newly suggested under seismic events in water distribution networks (WDNs). Detailed procedures for estimating the serviceability of WDNs using pressure driven analysis techniques, which can quantify available water supply under abnormal condition, are proposed. The methodologies are applied to Anytown network and get the result to compare with existing method. Proposed method leaded more appropriate hydraulic analysis results in abnormal situations such as earthquakes.
Do Guen Yoo; Chan Wook Lee; Seong Hyun Lim; Hyeong Suk Kim. Serviceability Assessment Model Based on Pressure Driven Analysis for Water Distribution Networks Under Seismic Events. Advances in Intelligent Systems and Computing 2019, 169 -174.
AMA StyleDo Guen Yoo, Chan Wook Lee, Seong Hyun Lim, Hyeong Suk Kim. Serviceability Assessment Model Based on Pressure Driven Analysis for Water Distribution Networks Under Seismic Events. Advances in Intelligent Systems and Computing. 2019; ():169-174.
Chicago/Turabian StyleDo Guen Yoo; Chan Wook Lee; Seong Hyun Lim; Hyeong Suk Kim. 2019. "Serviceability Assessment Model Based on Pressure Driven Analysis for Water Distribution Networks Under Seismic Events." Advances in Intelligent Systems and Computing , no. : 169-174.
Engineering benchmark problems with specific characteristics have been used to compare the performance and reliability of metaheuristic algorithms, and water distribution system design benchmarks are also widely used. However, only a few benchmark design problems have been considered in the research community. Due to the limited set of previous benchmarks, it is challenging to identify the algorithm with the best performance and the highest reliability among a group of algorithms. Therefore, in this study, a new water distribution system design benchmark problem generation method is proposed considering problem size and complexity modifications of a reference benchmark. The water distribution system design benchmark problems are used for performance and reliability comparison among several reported metaheuristic optimization algorithms. The optimal design results are able to quantify the performance and reliability of the compared algorithms which shows each metaheuristic algorithm has its own strengths and weaknesses. Finally, using the proposed method in this study, guidelines are derived for selecting an appropriate metaheuristic algorithm for water distribution system design.
Ho Min Lee; Donghwi Jung; Ali Sadollah; Do Guen Yoo; Joong Hoon Kim. Generation of Benchmark Problems for Optimal Design of Water Distribution Systems. Water 2019, 11, 1637 .
AMA StyleHo Min Lee, Donghwi Jung, Ali Sadollah, Do Guen Yoo, Joong Hoon Kim. Generation of Benchmark Problems for Optimal Design of Water Distribution Systems. Water. 2019; 11 (8):1637.
Chicago/Turabian StyleHo Min Lee; Donghwi Jung; Ali Sadollah; Do Guen Yoo; Joong Hoon Kim. 2019. "Generation of Benchmark Problems for Optimal Design of Water Distribution Systems." Water 11, no. 8: 1637.
A framework is presented to effectively improve the water distribution system (WDS) reliability. The proposed framework first classifies pipes in a WDS into three reinforcement types through topological analyses and hydraulic simulations over the WDS; type 1: no reinforcement, type 2: increasing pipe durability, and type 3: installing valve(s) at both ends. Then two rules, rules 1 and 2, are implemented, in which rule 1 first reinforces the pipe with the lowest reliability but rule 2 preferentially reduces damage size by pipe failures represented as the expected number of customers out of service (EN). The proposed method was applied to Cherry Hill network, and considerably improved the WDS reliability from 0.137 to 0.483. Both approaches showed notable differences in changes of the EN at each step of reinforcement, where rule 2 showed a better capability to reduce the EN and detect vulnerable areas in the WDS than rule 1. In addition, a practical approach, maximizing valve installations and minimizing pipe replacements according to the reinforcement types in the system, provided an improved WDS reliability (0.423) close to that of the rule-based approach (0.483) using only 21% of the construction cost by the rule-based approach. The proposed framework can be guidelines for improving the WDS reliability under restricted budget and site conditions.
Kim; Hwan Don Jun; Do Guen Yoo; Seokhyeon Kim; Joong Hoon Kim; Jun; Yoo. A Framework for Improving Reliability of Water Distribution Systems Based on A Segment-Based Minimum Cut-Set Approach. Water 2019, 11, 1524 .
AMA StyleKim, Hwan Don Jun, Do Guen Yoo, Seokhyeon Kim, Joong Hoon Kim, Jun, Yoo. A Framework for Improving Reliability of Water Distribution Systems Based on A Segment-Based Minimum Cut-Set Approach. Water. 2019; 11 (7):1524.
Chicago/Turabian StyleKim; Hwan Don Jun; Do Guen Yoo; Seokhyeon Kim; Joong Hoon Kim; Jun; Yoo. 2019. "A Framework for Improving Reliability of Water Distribution Systems Based on A Segment-Based Minimum Cut-Set Approach." Water 11, no. 7: 1524.