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신창민 ( Chang Min Shin ),김경현 ( Kyunghyun Kim ) 한국물환경학회(구 한국수질보전학회) 2016 한국물환경학회지 Vol.32 No.6
A watershed model was constructed using Hydrological Simulation Program Fortran to predict the water quality, especially chlorophyll-a, at major tributaries of Nakdong River basin, Korea. The BOD export loads for each land use in HSPF model were estimated to 1.47~8.64 kg/km<sup>2</sup>/day, which of values were similar to the domestic monitoring export loads. The T-N and T-P export loads were estimated to 0.618~3.942 kg/km<sup>2</sup>/day and 0.047~0.246 kg/km<sup>2</sup>/day, slightly less than the domestic monitoring data but within the range of foreign literature values. The model was calibrated at major tributaries for a three-year period (2008 to 2010). The deviation values ranged from -31.5 to 1.6% of chlorophyll-a, -24.0~2.2% of T-N, and -5.7~34.8% of T-P and root mean square error (RMSE) ranged from 4.3~44.4 ug/L of chlorophyll-a, -0.6~1.5 mg/L of T-N, and 0.04~0.18 mg/L of T-P, which show good calibration results. The operational water quality forecasting results for chlorophyll-a presented in this study were in good agreement with measured data and had a similar accuracy with model calibration results.
실측 하천 단면자료를 이용한 HSPF 유역모델의 수리정확도 개선
신창민 ( Chang Min Shin ) 한국물환경학회(구 한국수질보전학회) 2016 한국물환경학회지 Vol.32 No.6
The hydrological simulation program-FORTRAN (HSPF) is a comprehensive watershed model that employs depth-area- volume-flow relationships knows as the hydraulic function table (FTABLE) to represent the geometric and hydraulic properties of water bodies. The HSPF model`s hydraulic representation mainly depends on the accuracy of the FTABLES and the hydraulic representation determines the respond time of water quality state variables and also control scour, deposition, and transport of sediments in the water body. In general, FTABLES are automatically generated based on reach information such as mean depth, mean width, length, and slope along with a set of standard assumptions about channel geometry and hydraulics, so these FTABLES can`t describe accurately the geometry and hydraulic behavior of rivers and reservoirs. In order to compensate the weakness of HSPF for hydraulic modeling, we have generated alternative methods to improve the accuracy of FTABLES for rivers using the surveyed cross sections and rating curves. The alternative method based on the hydraulics simulated by HEC-RAS using the surveyed cross sections and rating curves could improve significantly the accuracy of FTABLES. The alternative FTABLE could improve greatly the HSPF model`s hydraulic accuracy but had little effect on the hydrological simulation.
신창민(Chang-Min Shin),김창헌(Chang-Hun Kim),이철웅(Chul-Woong Lee) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.2Ⅱ
메쉬 간략화 방법들 중에서 vertex clustering방법에서 사용되는 공간 분할법은 일반적으로 실시간 간략화를 지향하는 속도를 얻을 수 있지만, 간략화된 메쉬의 질(quality)이 떨어지는 문제점을 가진다. 본 논문은 기존의 공간 분할법과는 달리 곡률에 따라 비균등하게 공간을 분할함으로써 원래의 메쉬 변형에 영향을 덜 주는 vertex들이 먼저 간략화되는 알고리즘을 제안한다. 제안 알고리즘은 먼저 vertex들의 곡률을 구한 다음, 구해진 곡률을 이용하여 메쉬를 감싸는 공간을 비균등하게 분할하고 curvature tree를 만든다. Curvature tree에는 상위 노드에서 하위 노드로 갈수록 곡률이 더 작은 vertex들이 존재하게 되고, 간략화는 하위 노드에서 시작하여 상위 노드로 올라가면서 이루어지므로 곡률이 작은, 즉 메쉬의 변형에 영향을 덜 주는 vertex들이 먼저 제거되어 간략화가 이루어지더라도 원래의 메쉬에 형태에는 크게 영향을 미치지 않게 된다. 따라서 제안 알고리즘은 기존의 균등 공간 분할법의 특징인 빠른 속도를 유지하면서, 메쉬의 특징적인 부분을 보다 잘 유지시키는 특징을 가진다.
고경도 플라스틱 커버 패널에 대한 볼 낙하 충격 해석 및 내충격 특성 분석
신창민(Chang-Min Shin),오현철(Hyeon-Cheol Oh),김근영(Keun-Young Kim),정누리(Nu-Ri Cheong),이병채(Byung-Chai Lee) (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1
A cover material of the smart devices requires high impact resistances enough to protect its core modules. A tempered glass was preferred as a cover material until nowadays. Recently, various researches are done for develop high-hardness plastic as a cover material considering cost reduction, manufacturability and selfweight. In this research, the impact resistance properties of the high-hardness cover plastic are evaluated by means of the finite element analysis and the ball-drop tests. Finite element models of the ball-drop test are constructed and simulated by ABAQUS/CAE. In addition, the influences of the cover thickness and property modification on the impact resistance property were analyzed.