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다중 Logistic 회귀분석을 통한 침수지역의 확률적 도출
정민규,김진국,오랑치맥 솜야,권현한,Jung, Minkyu,Kim, Jin-Guk,Uranchimeg, Sumiya,Kwon, Hyun-Han 한국수자원학회 2020 한국수자원학회논문집 Vol.53 No.2
The increase of impervious surface and development along the river due to urbanization not only causes an increase in the number of associated flood risk factors but also exacerbates flood damage, leading to difficulties in flood management. Flood control measures should be prioritized based on various geographical information in urban areas. In this study, a probabilistic flood hazard assessment was applied to flood-prone areas near an urban river. Flood hazard maps were alternatively considered and used to describe the expected inundation areas for a given set of predictors such as elevation, slope, runoff curve number, and distance to river. This study proposes a Bayesian logistic regression-based flood risk model that aims to provide a probabilistic risk metric such as population-at-risk (PAR). Finally, the logistic regression model demonstrates the probabilistic flood hazard maps for the entire area.
습식 전기집진기를 위한 고유량 정전분무 가시화 및 액적 크기측정 연구
정민규(Minkyu Jung),김소연(Soyeon Kim),임지훈(Jihun Lim),이진욱(Jinwook Lee),정상훈(Sanghun Jeong),구돈익(Donik Ku),김민성(Minsung Kim) 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.2
정전분무란 노즐에 고전압을 인가하여 통과하는 유체가 정전기적 척력에 의해 액적으로 흩어지듯 분무되는 현상을 말한다. 콘젯 모드에 집중된 기존 연구와 달리, 플랜트 후단에 설치해 배가스 내 미세먼지를 집진하는 정전분무 전기집진기의 경우 수십 배에 달하는 고유량 조건을 사용하여 분무 양상이 상이하다. 미세먼지 입자와의 충돌 및 응집을 통해 집진 효율을 향상시키기 위해 분무 범위 및 분무 액적의 크기에 대한 관찰이 매우 중요하다. 따라서 본 연구에서는 정전분무 전기집진기를 위한 고유량 조건의 정전분무의 분무 형상 및 범위를 가시화를 통해 살펴보았다. 고속 스트로보스코프를 사용한 쉐도우그래프 기법으로 얻은 분무액적 이미지를 통해 액적 크기 측정 및 평균 액적 크기에 대한 파라미터 연구를 실행하였다. Electrospray refers to a phenomenon in which a fluid passing through a nozzle is sprayed in the form of droplets by electrostatic repulsion when a high voltage is applied to the nozzle. Unlike the previous research focused on the conejet mode, the electrostatic spray for particulate matter collection from power plant exhaust gas uses a high flow rate that is dozens of times higher leading to the distinctive spraying modes. It is important to observe the spray range and the size of spray droplets to improve the dust collection efficiency through colliding and agglomeration with fine dust particles. In this study, the shape and distribution of the electrospray under a high flow rate was visualized. An image processing software was used for the spray droplet photos to characterize the electrospray. The photos were captured using the shadowgraph technique with a high-speed strobe. From the analysis, the droplet diameter was measured, and the statistical distribution was characterized by applying a certain voltage.
정민규(Minkyu Jung),주재환(Jaehwan Ju),김채원(Chae Won Kim),이창건(Changkun Lee),김용석(Yongsuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Manufacturers are making every effort to reduce new car development period, in order to meet customer requests in time of need. To reduced development period, CAE method is used in most fields of vehicle performance. Especially, as for durability performance of body structure, it takes generally long time to finish physical validation using RLDA obtained from proving ground considering time of hardware vehicle building and testing. Also, there are many difficulties in prediction fatigue life of body structure because it is hard to get account fatigue parameter of material and accurate loads on body structure before physical RLDA test. However, CAE method has strong benefits to predict before physical test, under the condition that there is well-correlated CAE model including dynamic loads calculated from virtual dynamic loads. This paper shows the durability CAE method explaining how to use virtual loads and to correlate with multi-channel durability LAB test. And this paper is trying to propose virtual validation methods to predict specific part of body structure fatigue life using virtual loads.
Closure slam loadcase에서 노치효과를 고려한 피로해석에 대한 연구
정민규(Minkyu Jung),임광배(Kwangbae Lim),권희환(Huihwan Kwon) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
There are lots of validations through CAE and test in the development of vehicle to satisfy customer needs in the automotive industry. Closure slam is one of these validation which is the situation when customer close the closure like as hood, side door and lift gate. In this paper, hood slam and lift gate slam are considered where the structure has notch at the impacted area. Generally, commercial CAE tool can calculate notch effect automatically considering geometric characteristic, but in some cases, this is not enough to predict correct fatigue life through analysis due to under estimated stress near notch area. Seegerheuler method was used for calculation of correct stress and strain at notch area, and this approach had showed very good correlation with physical test. Additionally, this correlated data can show us optimized design update through accurate fatigue life prediction.
연구용 원자로의 감쇠탱크 설계 및 평가방안에 관한 연구
정민규(Minkyu Jung),박홍범(Hong-Beom Park),서경우(KyoungWoo Seo),김성훈(Seong-Hoon Kim) 대한기계학회 2018 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.6 No.2
연구용 원자로에서 일차 냉각 계통은 노심을 직접 통과하면서 냉각을 수행한다. 이로 인해 다종의 방사화 생성물을 포함하고 있는데, 고에너지 감마선을 포함하는 N-16 을 감소시키기 위해 감쇠탱크를 설치하게 된다. 감쇠탱크는 매우 큰 부피를 가지고 있어, 원자로 건물의 상당부를 차지해 보다 효율적이며 정교한 설계를 요구한다. 감쇠탱크는 원통형 실린더 형상에 상하부 타원형 헤드로 구성되어 있으며, 내부에는 다공판과 유동 가이드가 설치되어 있다. 커다란 부피는 냉각재의 속도를 늦추는 기능을 수행하는 반면, 다공판의 홀과 유동 가이드는 감쇠탱크 내 고른 유동 분포를 가지도록 한다. 감쇠탱크설계는 탱크 내 체류시간으로 평가할 수 있으며, 이를 수치적으로 비교하기 위해 입자 활용 방법 및 스칼라 활용방법을 적용하였다. To decrease the N-16 radioactivity, a decay tank is installed at the reactor outlet pipes in PCS (Primary Cooling System) for research reactors. The decay tank represents a significant portion of building due to own huge volume, thus efficient and elaborate design is required. The decay tank consists of circular cylinder body, two elliptical heads, perforated plates, and flow guides. The perforated plate makes evenly distributed flow using plate holes with decreased flow velocity. A numerical method is utilized to analyze the flow features and calculate the residence time inside the tanks. To obtain more accurate residence time, available numerical methods, such as streamline, massless particle, and user-defined scalar, are used and compared.