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Application of Self-adaptive Vision-Correction Algorithm for Water-Distribution Problem
이의훈 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.3
Water is one of the essential elements in human life, and the water-distribution system is an important infrastructure that distributes water to the people. The design of the water-distribution system was done manually in the past, but recently, it was conducted by applying optimization algorithms. Various optimization algorithms were developed for the optimal design of the water-distribution system, but there was a disadvantage to perform sensitivity analysis for parameter estimation manually. A vision-correction algorithm (VCA) was developed to emulate the conventional manual vision-correction procedure, and it exhibited a good performance in many mathematical benchmark and civil engineering problems. However, the VCA has limited usefulness because of its large number of parameters, many of which require estimation. In this study, a self-adaptive VCA (SAVCA) was developed to overcome these shortcomings by modifying the parameters of the VCA to be self-adaptive or fixed. The Balerma network — a water-distribution system — was selected as a civil engineering problem. The results of SAVCA were better than those of other methods for the design of Balerma network. The SAVCA exhibited good usability and performance and can be applied to various fields in civil engineering including the water-distribution system.
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이의훈,이용식,정동휘,주진걸,김중훈 한국방재학회 2016 한국방재학회논문집 Vol.16 No.5
Recently, flood frequently have occurred because of high ratio of impervious area in urban area. However, measures of preventing floods is only structural measures such as increasing pump stations, sewer networks and detention storages. Additionally, nonstructural measures such as operation of drainage facilities are essential because structural measures require much time and cost. In this study, new type and operation of urban offline detention storages including structural/nonstrucutral measures are suggested. The inlet type of detention storage having fixed weir by design is replaced by inlet gate and it is open and close by level of inlet and monitoring node. Maximum flood reduction effects by new inlet and operation are over 17% in 2010 and 2011 rainfall events compared with present. 최근 도시지역에서는 높은 불투수면적비 때문에 침수량이 급증하고 있지만 현재의 치수대책들은 빗물펌프장, 우수관거 및 빗물저류조를 포함한 내배수시설들을 증설하는 구조적인 대책에 머물고 있다. 게다가 구조적인 대책의 경우 많은 시간 및 비용이 소요되므로 내배수시설의 운영과 같은 비구조적인 대책이 필요하다. 본 연구에서는 구조적/비구조적 치수대책을 포함한 도시지역 오프라인 빗물저류조의 새로운 유입부 형식 및 운영을 제안하였다. 기존의 설계에 의해 정해진 높이의 월류턱으로 설계되고 있는 빗물저류조 유입부 형식을 수문형태로 교체하고 유입지점 및 모니터링 지점의 수위에 따라 수문개폐를 결정하는 운영을 실시하였다. 본 연구에서 제안한 유입부 형식 및 운영은 기존에 비해 2010년 강우 및 2011년 강우를 적용하였을 때 최대 17% 이상의 침수저감 효과를 보인다.
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Muskingum 홍수추적을 위한 자가적응형 메타 휴리스틱 알고리즘의 적용
이의훈 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.7
In the past, meta-heuristic optimization algorithms were developed to solve the problems caused by complex nonlinearities occurring in natural phenomena, and various studies have been conducted to examine the applicability of the developed algorithms. The self-adaptive vision correction algorithm (SAVCA) showed excellent performance in mathematics problems, but it did not apply to complex engineering problems. Therefore, it is necessary to review the application process of the SAVCA. The SAVCA, which was recently developed and showed excellent performance, was applied to the advanced Muskingum flood routing model (ANLMM-L) to examine the application and application process. First, initial solutions were generated by the SAVCA, and the fitness was then calculated by ANLMM-L. The new value selected by a local and global search was put into the SAVCA. A new solution was generated, and ANLMM-L was applied again to calculate the fitness. The final calculation was conducted by comparing and improving the results of the new solution and existing solutions. The sum of squares (SSQ) was used to calculate the error between the observed and calculated runoff, and the applied results were compared with the current models. SAVCA, which showed excellent performance in the Muskingum flood routing model, is expected to show excellent performance in a range of engineering problems. 과거 자연현상에서 발생하는 복잡한 비선형성에 따른 문제를 해결하기 위해 메타 휴리스틱 최적화 알고리즘들이 개발되었고 개발된 알고리즘의 적용성을 검토하기 위해 다양한 연구들이 진행되었다. Self-adaptive vision correction algorithm (SAVCA)는 수학 문제에서는 우수한 성능을 보여주었지만 복잡한 공학 문제들에 적용되지 않았을 뿐만 아니라 SAVCA의 적용과정에 대한 검토가 필요하다. SAVCA의 공학 문제에 대한 적용 및 적용과정에 대한 검토를 위해 최근 개발되어 우수한 성능을 보여주었던 advanced nonlinear Muskingum flood routing model (ANLMM-L)에 적용하였다. 먼저 SAVCA에 의해 초기 해집합을 생성한 후 ANLMM-L을 통해 적합도를 산출하였다. 국지탐색 및 전역탐색에 의해 선택된 새로운 값을 SAVCA에 넣고 새로운 해를 생성한 후 다시 ANLMM-L을 적용하여 적합도를 계산하였다. 새로운 해와 기존 해집합의 결과를 비교하여 개량하는 방법을 통해 마지막 연산이 진행되었다. 관측 유출량과 계산된 유출량과의 오차를 계산하기 위해 sum of squares (SSQ)가 사용되었으며 적용한 결과는 기존 방법들과 비교하였다. Muskingum 홍수추적에서 우수한 성능을 보여준 SAVCA는 다양한 공학 문제들에 적용되어 우수한 성능을 보여줄 것으로 예상된다.
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Development of a Reliability Index Considering Flood Damage for Urban Drainage Systems
이의훈,김중훈 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.4
Urban drainage systems are used to safely drain rainwater and prevent urban inundation, and their reliability is usually calculated from the probability of failure, which includes the probability of the drainage facilities being destroyed. This study proposes a new reliability index that includes three factors (flood volume, nodes, and damage), with the aim of prioritizing the structural and nonstructural measures required to improve urban drainage systems. In this study, synthetic rainfall data are generated by the Huff distribution and are used as input data for runoff simulations. The Distance Measure Method that uses a utopian approach is employed here to generate a dimensionless reliability index, as the three factors use different units and no definitive criteria currently exist to determine the weights that should be assigned to each factor. The reliability indexes of flood volume, nodes, and damage determined in this study are 0.7226, 0.4584 and 0.9750, respectively, as the three factors are weighted equally in the reliability index calculation. Using the new method, the reliability index of the city of Jeongup is 0.6484. The new reliability index can be used to assess the effectiveness of various flood mitigation measures in preparation for extreme rainfall events.
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