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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.
북미 IIHS의 천정강도 개선을 위한 차체구조 특성 연구
정민규(Minkyu Jung),김인규(Inkyoo Kim),김정룡(Jungryoung Kim),배현우(Hyunwoo Bai),이만수(Mansu Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, the interest in vehicle safety is increasing, so engineers continuously work on reducing occupant injuries from the frontal, side, rear crash as well as roll over crash. In related to roll over crush, National Highway Traffic Safety Administration (NHTSA) issued Notice of Proposed Rulemaking (NPRM) enhancing the safety standard on roof crush resistance, FMVSS No. 216 is amending some part of the test procedure. Also, in order to nominate a vehicle for the Top Safety Pick award in Insurance Institute for Highway Safety (IIHS), the vehicle must have good ratings in all four Institute tests. In case of roof crush resistance test, strength to weight ratio (SWR) of 4.0 times must measured within 5 inches of plate displacement to obtain good rating. CAE simulation has become a useful tool to optimize the roof structure. This paper shows the correlated CAE results with a physical test. And the improvement of Roof Crush resistance is conducted by using correlated CAE model.
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.
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.