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Surface-FTABLE을 활용한 논 배수량 및 배출부하량 산정
김석현 ( Seokhyeon Kim ),김지혜 ( Jihye Kim ),이현지 ( Hyunji Lee ),곽지혜 ( Jihye Kwak ),김시내 ( Sinae Kim ),강문성 ( Moon Seong Kang ) 한국농공학회 2023 한국농공학회 학술대회초록집 Vol.2023 No.0
The Hydrological Simulation Program-FORTRAN (HSPF)는 대표적인 유역모형 중 하나로 국내외에서 널리 적용되고 있다. 그러나 국외 밭이 주를 이루는 지역에서 개발되어 국내의 담수형태의 논을 제대로 반영하기 힘들다. 이 때문에 유역 모델링 시 논, 특히 관개지구에 대하여 적용하기 어려워 모의가 가능한 다른 모형을 통해 수행하고 각각의 결과를 분석하고 있다. 그러나 이러한 방식은 매개변수의 증가를 유발하여 불확실성을 증가시키고, 모형별로 추가 작업을 수행해야하기때문에 작업량을 증가시킨다. 최근 HSPF 12.4 버전에 추가된 Surface-FTABLE 기능을 통해 논의 지표유출량을 계산하는 방식이 제시되었으며, 이는 논둑과 물꼬높이에 따른 담수변화를 구현할 수 있을 뿐만아니라 Special Action 기능을 통해 물꼬높이를 시기별로 조절하여 배수량 변화를 평가할 수 있게 하였다. 하지만 아직 논에서의 배수량만을 평가 할 수 있으며 수질변화는 고려하지 못한다. 이에 본 연구에서는 surface-FTABLE을 이용해 배수량 뿐만아니라 수질변화와 물질수지를 분석하고자하였다. 물질수지 측정자료와 비료 투입자료를 통해 논에서의 수질 변화를 모의하였으며, 배수량과의 연계를 통해 배출부하량을 산정하였다. 본 연구의 결과는 추후 논에서의 배출부하량 뿐만아니라 논에서의 수질관리가 하천에 미치는 영향까지 평가할 수 있을것으로 기대한다.
( Seokhyeon Kim ),( Sung Il Im ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Introduction: Ventricular premature complexes (VPCs) detected from long-term ECG recordings have been associated with an increased risk of ischemic stroke. However, there was limited data about the association between high VPCs burdens and stroke symptoms without prior stroke. Methods: The Kosin University 24-hours holter monitoring, echocardiography,ECG database were reviewed from 2013 to 2015 to identify patients (pts) with frequent VPC (>20%). We compared the long-term clinical outcomes between the pts with frequent VPCs (>20%) and control group without VPC. Results: Among 304 pts who underwent 24-hours holter monitoring, 122 (40.1%) pts had high VPCs burdens (>20%). There was no difference of the incidence of total any events including bleeding events, thromboembolic events, arrhythmic events, re-hospitalizations and mortality in both groups (p=0.812). However, stroke symptoms including painless weakness, numbness, loss of vision, or inability to speak or understand occurred in 62 pts, with a significantly higher incidence in pts with high VPCs burdens (>20%) than the control group (p<0.001), In univariate analysis, age, diabetes mellitus and high VPCs burdens (>20%) were significantly associated with stroke symptoms. In multivariate analysis, age (p=0.02) and high VPCs burdens (p<0.001) were independent risk factors for stroke symptoms at the long-term follow-up. Conclusions: High VPCs burdens (>20%) were associated with and stroke symptoms without a prior stroke in the long-term follow up, suggesting more intensive medical follow-up will be required.
Seokhyeon Jegal,Siwon Song,Jae Hyung Park,Jinhong Kim,Seunghyeon Kim,Sangjun Lee,Hyungi Byun,Bongsoo Lee 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
The inorganic scintillator used in gamma spectroscopy must have good efficiency in converting the kinetic energy of charged particles into light as well as high light output and high light detection efficiency. Accordingly, various studies have been conducted to enhance the net-efficiency. One way to improve the light yield has been studied by coating scintillators with various nanoparticles, so that the scintillation light can undergo resonance on surface between scintillators and nanoparticles resulting in higher light yield. In this study, an inorganic scintillator coated with CsPbBr3 perovskite nanocrystals using dip coating technique was proposed to improve scintillation light yield. The experiment was carried out by measuring scintillation light output, as the result of interaction between inorganic scintillator coated with CsPbBr3 perovskite nanocrystals and gamma-ray emitted from Cs-137 gamma source. The experimental results show that the channel corresponding to 662 keV full energy peak in the Cs-137 spectrum shifted to the right by 14.37%. Further study will be conducted to investigate the detailed relationships between the scintillation light yield and the characteristics of coated perovskite nanoparticles, such as diameter of nanoparticles, coated area ratio and width of coated region.
농업용 저수지 및 관개지구를 고려한 농업유역 물순환율 개발
김석현 ( Kim Seokhyeon ),송정헌 ( Song Jung-hun ),황순호 ( Hwang Soonho ),김학관 ( Kim Hak Kwan ),강문성 ( Kang Moon Seong ) 한국농공학회 2020 한국농공학회논문집 Vol.62 No.2
The water circulation in agricultural watersheds changes with the operation of agricultural reservoirs, it is necessary to classify and evaluate them into upstream, agricultural reservoirs, irrigation districts, and downstream. Therefore, in this study, we developed the agricultural water circulation rate (AWCR) considering an agricultural reservoir and irrigation district by improving the water circulation rate of the Water environmental conservation Act. we applied it to Jinwi watershed using the module-based hydrologic analysis system to simulate the water circulation for agricultural reservoirs and irrigation areas. The model performance during the validation period was NSE of 0.762 for the downstream stream and 0.682 for the reservoir level. And the hydrograph separation model was applied to separate the direct and baseflow. As a result of this study, The AWCR of Jinwi watershed was 71.8% on average, which was higher than the water circulation rate estimated by the downstream hydrograph separation.
간월호 유역의 토지이용 및 기후변화에 따른 논밭 필요수량 변화 추정
김시내 ( Kim Sinae ),김석현 ( Kim Seokhyeon ),황순호 ( Hwang Soonho ),전상민 ( Jun Sang-min ),송정헌 ( Song Jung-hun ),강문성 ( Kang Moon-seong ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.6
This study aims to assess the changes in crop water requirement of paddy and upland according to future climate and land use changes scenarios. Changes in the spatiotemporal distribution of temperature and precipitation are factors that lower the stability of agricultural water supply, and predicting the changes in crop water requirement in consideration of climate change can prevent the waste of limited water resources. Meanwhile, due to the recent changes in the agricultural product consumption structure, the area of paddy and upland has been changing, and it is necessary to consider future land use changes in establishing an appropriate water use plan. Climate change scenarios were derived from the four GCMs of the CMIP6, and climate data were extracted under two future scenarios, namely SSP1-2.6 and SSP5-8.5. Future land use changes were predicted using the FLUS (Future Land Use Simulation) model. Crop water requirement in paddy was calculated as the sum of evapotranspiration and infiltration based on the water balance in a paddy field, and crop water requirement in upland was estimated as the evapotranspiration value by applying Penman-Monteith method. It was found that the crop water requirement for both paddy and upland increased as w e go to the far future, and the degree of increase and variability by time showed different results for each GCM. The results derived from this study can be used as basic data to develop sustainable water resource management techniques considering future watershed environmental changes.