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신창민 ( Chang Min Shin ),민중혁 ( Joong-hyuk Min ),박수영 ( Su Young Park ),최정규 ( Jungkyu Choi ),박종환 ( Jong Hwan Park ),송용식 ( Young Sik Song ),김경현 ( Kyunghyun Kim ) 한국물환경학회(구 한국수질보전학회) 2017 한국물환경학회지 Vol.33 No.2
A watershed-river linked modeling system was developed to forecast the water quality, particularly weekly changes in chlorophyll-a concentration, of the Yeongsan River, Korea. Hydrological Simulation Program-Fortran (HSPF) and Environmental Fluid Dynamics Code (EFDC) were adopted as the basic model framework. In this study, the EFDC model was modified to effectively simulate the operational condition and the flow of multi-functional weirs constructed in the main channel of rivers. The model was tested against hydrologic, water quality and algal data collected at the right upstream sites of two weirs in 2014. The mean absolute errors (MAEs) related to model calibration in the annual variations of the river stage, TN, TP, and algal concentration were 0.03 - 0.10 m, 0.65 - 0.67 mg/L, 0.03 - 0.04 mg/L, and 9.7 - 10.8 mg/m<sup>3</sup>, respectively. On the other hand, the MAE values of forecasting results for the chlorophyll-a level at the same sites in 2015 ranged from 18.7 to 22.4 mg/m<sup>3</sup>, which were higher than those for model calibration. Increased errors in forecasting were mainly attributed to higher uncertainties in weather forecasting data compared to the observed data used for model calibration.
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.
HSPF 유역모델을 이용한 낙동강유역 실시간 수온 예측
신창민 ( Chang Min Shin ),나은혜 ( Eun Hye Na ),김덕길 ( Duck Gil Kim ),김경현 ( Kyung Hyun Kim ) 한국물환경학회 2014 한국물환경학회지 Vol.30 No.6
A watershed model was constructed using Hydrological Simulation Program Fortran to predict the water temperature at major tributaries of Nakdong River basin, Korea. Water temperature is one of the most fundamental indices used to determine the nature of an aquatic environment. Most processes of an aquatic environment such as saturation level of dissolved oxygen, the decay rate of organic matter, the growth rate of phytoplankton and zooplankton are affected by temperature. The heat flux to major reservoirs and tributaries was analyzed to simulate water temperature accurately using HSPF model. The annual mean heat flux of solar radiation was estimated to 150∼165 W/㎡, longwave radiation to ?48∼-113 W/㎡, evaporative heat loss to ?39∼-115 W/㎡, sensible heat flux to ?13∼-22 W/㎡, precipitation heat flux to 2∼4 W/㎡, bed heat flux to ?24∼22 W/㎡ respectively. The model was calibrated at major reservoir and tributaries for a three-year period (2008 to 2010). The deviation values (Dv) of water temperature ranged from ?6.0 to 3.7%, Nash-Sutcliffe efficiency(NSE) of 0.88 to 0.95, root mean square error(RMSE) of 1.7∼2.8℃. The operational water temperature forecasting results presented in this study were in good agreement with measured data and had a similar accuracy with model calibration results.
HSPF 유역모델을 이용한 낙동강유역 실시간 수문 유출 예측
신창민 ( Chang Min Shin ),나은혜 ( Eun Ye Na ),이은정 ( Eun Jeong Lee ),김덕길 ( Duk Gil Kim ),민중혁 ( Joong Hyuk Min ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.2
A watershed model was constructed using Hydrological Simulation Program Fortran to quantitatively predict the stream flows at major tributaries of Nakdong River basin, Korea. The entire basin was divided into 32 segments to effectively account for spatial variations in meteorological data and land segment parameter values of each tributary. The model was calibrated at ten tributaries including main stream of the river for a three year period 2008 to 2010. The deviation values Dv of runoff volumes for operational stream flow forecasting for a six month period 2012.1.2 to 2012.6.29 at the ten tributaries ranged from -38.1 to 23.6%, which is on average 7.8% higher than those of runoff volumes for model calibration -12.5 to 8.2%. The increased prediction errors were mainly from the uncertainties of numerical weather prediction modeling; nevertheless the stream flow forecasting results presented in this study were in a good agreement with the measured data.
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.
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.