SATEEC 시스템을 이용한 객토 토양의 토성고려에 따른 도암댐 유역의 토양유실 및 유사량 분석

유동선 ( Dongsun Yoo ),안재훈 ( Jaehun Ahn ),윤정숙 ( Jongsuk Yoon ),허성구 ( Sunggu Heo ),박윤식 ( Younshik Park ),김종건 ( Jonggun Kim ),임경재 ( Kyoung Jae Lim ),김기성 ( Ki-sung Kim ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-

There have been serious soil erosion and water pollution problems caused by highland agriculture practices at Doam-dam watershed. Especially agricultural activities, chemical and organic fertilizer and pesticide applications, soil reconditioning to maintain soil fertility are known as primary causes of soil erosion and water qaulity degradation in the receiving water bodies. Among these, soil reconditioning can accelerate soil erosion rates. To develop soil erosion prevention practices, it is necessary to first estimate the soil erosion from the watershed. Thus, the Universal Soil Loss Equation (USLE) model has been developed and utilized to assess soil erosion. However, the USLE model cannot be used at watershed scale because it does not consider sediment delivery ratio (SDR) for watershed application. For this reason, the Sediment Assessment Tool for Effective Erosion Control (SATEEC) was developed to assess the sediment yield at any point in the watershed. The USLE-based SATEEC system can estimate the SDR using area-based SDR and slope-based SDR module. In this study, the SATEEC system was used to estimate soil erosion and sediment yield at the Doam-dam watershed using the soil properties from reconditioned agricultural fields. Based on the soil sampling and analysis, the USLE K factor was calculated and used in the SATEEC system to analyze the possible errors of previous USLE application studies using soil properties from the digital soil map, compared with that using soil properties obtained in this study. The estimated soil erosion at the Doam-dam watershed without using soil properties obtained in the soil sampling and analysis is 1,791,400 ton/year (123 ton/ha/year), while the soil erosion amounts is 2,429,900 ton/year (166.8 ton/ha/year) with the use of soil properties from the soil sampling and analysis. There is 35% increases in estimated soil erosion and sediment yield with the use of soil properties from soil reconditioned agricultural fields. Since significant amounts of soil erosion are known to be occurring from the agricultural fields, the soil erosion and sediment yield from only agricultural fields was assessed. The soil erosion rate is 45.9 ton/ha/year without considering soil properties from soil reconditioned agricultural fields, while 105.3 ton/ha/year after considering soil properties obtained in this study, increased in 129%. This study shows it is very important to use correct soil properties to assess soil erosion and sediment yield simulation. It is recommended that further studies are needed to develop environment friendly soil reconditioning method should be developed and implemented to decrease the speed of soil erosion rates and water quality degradation.

UPLC를 이용한 밀크씨슬추출물 지표 성분인 실리마린 분석법 검증

유동선 ( Dongsun Yoo ),정경희 ( Kyung Hee Jung ),최승준 ( Seung Jun Choi ) 한국산업식품공학회 2018 산업 식품공학 Vol.22 No.2

밀크씨슬추출물의 지표물질인 실리마린 분석법의 효율성재고를 위하여 건강기능식품공전의 HPLC 분석법과 UPLC를 이용한 신규 분석법을 비교하여 분석법 검증 및 정량적 평가를 실시하였다. UPLC를 이용한 신규 분석법을 검증하기 위하여 특이성, 직선성, 정확성, 정밀성, 실험실 내 정밀성, 완건성 등 6개의 검증항목을 선정하여 UPLC 분석법검증을 실시하였다. 특이성에서 1.5 이상의 분리능을 보여 6가지 실리마린 표준물질이 HPLC 및 UPLC 분석법 모두에서 선택적으로 정확하게 검출됨을 확인하였다. 직선성에서는 25-400 μg/mL의 농도에서 결정계수 값이 0.9999 이상으로 거의 직선에 가까운 값을 보였다. 정확성에서 UPLC를 이용한 신규 분석법의 회수율은 평균 99%이상으로 HPLC 분석법보다 높은 회수율을 보였으며, 회수율편차역시 50% 이상 감소하였다. 정밀성에서도 UPLC 분석법에서 얻어진 피크 면적의 상대표준편차가 HPLC를 이용한 기존 분석법의 절반 이하로 감소하여 검증 항목에서 월등한 결과값을 보였다. 또한 실험실 내 정밀성에서도 UPLC분석법에서 얻어진 상대표준편차가 HPLC 분석법에 얻어진 상대표준편차보다 현저히 낮음을 확인하였다. 분석법검증 결과 6개의 검증항목에서 HPLC와 UPLC 분석법 모두 적합하게 검증되었으며, 검증항목 중 정확성, 정밀성, 실험실 내 정밀성 및 완건성 항목에서 UPLC 분석법의 검증값이 HPLC 분석법보다 뛰어났다. 이상의 결과로 UPLC를 사용한 실리마린의 분석법은 건강기능식품의 실리마린을 분석하는데 충분히 효율적인 분석법이 될 것으로 판단된다. This study attempted to establish an ultra performance liquid chromatography (UPLC) analysis method for standard determination of silymarin as a health functional food material in Silybum marianum extraxt (milk thistle). UPLC was performed on a Waters Acquity BEH C18 (50×2.1 mm, 1.7 μm) column using a gradient elution of distilled water and methanol at a flow rate of 0.21 mL/min and detection wavelength of 288 nm. The UPLC method showed high linearity in the calibration curve at a coefficient of determination (r2) of >0.9999, and limit of detection and quantitation for 6 flavonolignans were 0.0167-0.2469 and 0.1648-1.2931 μg/mL, respectively. The recovery of each flavnolignan was in the range of 99.96-100.81%, and the relative standard deviation for precision of each flavonolignan was less than 1.0%. The UPLC method established in this study was more specific for the quantitative determination of silymarin than the HPLC method. Also, since the UPLC method is shorter in the equipment operation time and smaller in the amount of used solvent than the HPLC method, UPLC is expected to have higher energy efficiency and lower environmental impact compared with HPLC.

경사지에서의 정확한 토양유실 및 유사량 분석을 위한 SWAT ArcView GIS Extension Patch 개발

김종건 ( Kim Jonggun ),박윤식 ( Park Younshik ),장원석 ( Jang Wonseok ),유동선 ( Yoo Dongsun ),김기성 ( Kim Ki-sung ),임경재 ( Lim Kyoung Jae ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-

The watershed scale SWAT model divides the watershed into smallersubwatersheds for rainfall-runoff and pollutant generation at the field level and routing though stream networks. The SWAT model first needs to be calibrated and validated for accurate estimation through adjustment of various input parameters. However, in some instances the SWAT simulated results are greatly affected by the watershed delineation and DEM cell size. In this study, the SWAT ArcView GIS Patch II was developed for steep sloping watershed and its performance was evaluated for various thresholdvalue and DEM cell size scenarios when delineating subwatersheds using SWAT. The SWAT ArcView GIS Patch II was developed using the ArcView GIS Avenue program and Spatial Analyst library. The SWAT ArcView GIS Patch II is better than the SWAT ArcView GIS Patch I by Lim et al. (2007) because it reflects the topographic factor in calculating the field slope length of the HRU in the SWAT model. The simulated sediment value for 321 watershed (threshold value of 200 ha) is greater than that for 43 subwatershed (threshold value of 25ha) by 201% without applying the SWAT ArcView GIS Patch II. However, when the SWAT ArcView GIS Patch II was applied, the difference decreases (12% difference) for the same scenario. The simulated sediment value for DEM cell size of 50m is greater than that for DEM cell size of 10m by 19.80% without the SWAT ArcView GIS Patch II. However, the difference becomes smaller (3.41% difference) between 50m and 10m DEM scenarios. As shown in this study, the SWAT ArcView GIS Patch II can reduce differences in simulated sediment values for various watershed delineation and DEM cell size scenarios. Without the SWAT ArcView GIS Patch II, variations in the SWAT simulated results using various watershed delineation and DEM cell size scenarios could be greater than those from input parameter calibration. The results obtained in this study show that the SWAT ArcView GIS Patch II needs to be used when simulating hydrology and water quality for steep sloping watersheds (especially if average slope ofthe subwatershed is greater than 25%) for accurate simulation of hydrology and water quality using the SWAT model.

CuBr 반도체 양자구슬에서의 Hole Burning 현상

박지호,박성욱,김일곤,유동선 昌原大學校 基礎科學硏究所 2002 基礎科學硏究所論文集 Vol.14 No.-

PSHB spectrum was measured by the pump-probe method. After the absorption band of the nanocrystals sample was excited by the spectrally narrow band light, the spectral hole was produced at the position of the exciting light. The depth of spectral holes(main hole and side hole) was decreased with the temporal change. The energy difference between the zero phonon line and side hole depends on the radius of nanocrystals.