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정재운,장정렬,최강원,임병진,이영재,강재홍,박혜린,조소현,Jung, Jae-Woon,Jang, Jeong-Ryeol,Choi, Kang-Won,Lim, Byung-Jin,Lee, Young-Jae,Kang, Jae-Hong,Park, Hye-Lin,Cho, So-Hyun 한국관개배수위원회 2010 한국관개배수논문집 Vol.17 No.2
For efficient water quality management of Saemangeum lake, it is very important to accurately analyze discharged load characteristics using investigated pollution sources data from Saemangeum watershed. Investigation of pollution sources was conducted from 2003 to 2007. In this study, pollution sources are largely classified into human population, livestock, industry, and land use. Discharged loads of BOD, T-N and T-P from classified pollution sources were calculated by Korea TMDL (Total Maximum Daily Load) technical guideline. The calculated results showed that the major sources of BOD and T-N were land use, human population, livestock, and industry in order. However, the major sources of T-P were livestock, land use, human population, and industry in order. Our results clearly show that pollution sources of the priority management for water quality enhancement in the Saemangeum lake has represented land use and livestock.
정재운,장정렬,정지연,최강원,임병진,김상돈,김갑순,윤광식,Jung, Jae-Woon,Jang, Jeong-Ryeol,Jung, Ji-Yeon,Choi, Kang-Won,Lim, Byung-Jin,Kim, Sang-Don,Kim, Kap-Soon,Yoon, Kwang-Sik 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.1
The HSPF (Hydrological Simulation Program-Fortran) model was applied to Mangyeong river watershed to examine its applicability through calibration using monitoring data. For the model application, digital maps were constructed for watershed boundary, land-use, Digital Elevation Model of Mangyeong river watershed using BASINS (Better Assessment Science for Intergrating point and Nonpoint Sources) program. The observed runoff was 1976.4mm while the simulated runoff was 1913.4mm from 2007 to 2008. The model results showed that the simulated runoff was in a good agreement with the observed data and indicated reasonable applicability of the model. In terms of water quality, trends of the observed value were in a good agreement with simulated value despite its model performance lower than expected. However, its reliability and performance were with the expectation considering complexity of the watershed, pollutant sources and land use intermixed in the watershed. Overall, we identified application of HSPF model as reliable evidence by model performance.
비가림 조건에서 시비에 대한 논담수 중 총질소 및 총인 농도 반응
정재운,최우정,윤광식,김한용,곽진협,임상선,장남익,허유정,Jung, Jae-Woon,Choi, Woo-Jung,Yoon, Kwang-Sik,Kim, Han-Yong,Kwak, Jin-Hyeob,Lim, Sang-Sun,Chang, Nam-Ik,Huh, Yu-Jeong 한국관개배수위원회 2007 한국관개배수논문집 Vol.14 No.1
Temporal changes in total nitrogen (T-N) and phosphorus (T-P) concentrations in paddy floodwater in response to fertilization under rain-shielding pot and small-scaled field conditions were investigated. On the basis of the changing patterns, suggestions for the use of fertilization factors, such as days after fertilization, in developing models for the estimation of T-N and T-P loads from paddy fields were made. Total N concentration was susceptible to fertilization, showing a peak concentration right after fertilization followed by a decreasing pattern with the elapse of days after fertilization. The decreasing pattern of T-N concentration followed the first- order kinetics, indicating that the models are likely to be an exponential equation using days after fertilization as an independent variable. Comparison between the pot and field experiments conducted with soils different in soil fertility revealed that indigenous soil N concentration significantly affected T-N concentration, and this suggests that soil N status can be used as the second variable for the models. Meanwhile, temporal changes in T-P concentration did not respond to P fertilization as sensitively as T-N. In combination with other published results, our study suggests that rainfall intensity and other factors associated with farming activities that are likely to cause disturbance of soil particles containing P may be used as possible variables for the models.
SWAT 자동보정기능을 이용한 새만금유역에서의 유출량 모의
정재운 ( Jae Woon Jung ),장정렬 ( Jeong Ryeol Jang ),임병진 ( Byung Jin Lim ),이영재 ( Yeong Jae Lee ),김갑순 ( Kap Soon Kim ),강재홍 ( Jae Hong Kang ),박혜린 ( Hye Lin Park ),조소현 ( So Hyun Cho ),윤광식 ( Kwang Sik Yoon ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.1
Application of auto-calibration tool of the Soil and Water Assessment Tool(SWAT) model was evaluated for long-term stream flow simulation from the Samangeum watershed. Hydrologic parameters calibration for basin scale such as Samangeum watershed is quite challenging task since huge variations of hydrologic properties of HRU`s. In this study, the sensitivity analysis of hydrologic parameters was initially conducted to evaluate auto-calibration tool of the SWAT model. The most sensitive parameters were: channel effective hydraulic conductivity(CH_K2), SCS Curve Number II value (CN2), surface runoff lag time(SURLAG), base flow alpha factor (Alpha_Bf), soil evaporation compensation factor(ESCO), and available water capacity (Sol_Awc), respectively. After sensitivity analysis, some important parameters were selected for SWAT model optimization. Calibration of selected parameters was conducted using auto calibration tool of SWAT model over the Saemangeum Watershed. The comparison between the observed and simulated stream flow indicated that there was a good agreement between the observed and simulated discharge, which was verified by coefficient of determination (R2) and Nash Sutcliffe efficiency (NSE) greater than 0.5. We found that auto-calibration tool of SWAT model was reliable for the optimization of parameters reflecting Saemangeum Watershed conditions.
적외선 센서로의 응용을 위한 반도성 YBa₂Cu₂O<SUB>7-x</SUB> 박막의 제작 및 전기적 특성
정재운(Jae-Woon Jeong),조서현(Seo-Hyeon Jo),이성갑(Sung-Gap Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.9
YBa₂Cu₂O7-x thin films were fabricated by the spin-coating method on SiO₂/Si substrate using an alkoxide-based sol-gel method. The structural and electrical properties were investigated for various 1st annealing temperature. Due to the formation of the polycrystalline single phase, synthesis temperature was observed at around 720℃ - 800℃. YBa₂Cu₂O7-x thin films with the 1st annealing temperature of 450oC~500oC showed the single XRD patterns without the second phase, such as YBa₂Cu₄O8. The thickness of films was approximately 0.23 ㎛~0.27 ㎛. Aerage grain size, resistance and temperature coefficient of resistance (TCR) of YBa₂Cu₂O7-x thin films with the 1st annealing temperature of 500℃ were 0.27 ㎛, 59.7㏁ and ?3.7 %/K, respecvitely.