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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.
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.