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논문 : 정보처리 및 복합기술 ; 광반사를 이용한 한국 논 토양 특성 추정
정선옥 ( S. O Chung ),정기열 ( K. Y. Jung ),( Kenneth A. Sudduth ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.1
An optical sensing approach based on diffuse reflectance has shown potential for rapid and reliable on-site estimation of soil properties. Important sensing ranges and the resulting regression models useful for soil property estimation have been reported. In this study, a similar approach was applied to investigate the potential of reflectance sensing in estimating soil properties for Korean paddy fields. Soil cores up to a 65-cm depth were collected from 42 paddy fields representing 14 distinct soil series that account for 74% of the total Korean paddy field area. These were analyzed in the laboratory for several important physical and chemical properties. Using air-dried, sieved soil samples, reflectance data were obtained from 350 to 2500 nm on a 3 nm sampling interval with a laboratory spectrometer. Calibrations were developed using partial least squares (PLS) regression, and wavelength bands important for estimating the measured soil properties were identified. PLS regression provided good estimations of Mg (R2=0.80), Ca (R2=0.77), and total C (R2=0.92); fair estimations of pH, EC, P2O5, K, Na, sand, silt, and clay (R2 = 0.59 to 0.72); and poor estimation of total N. Many wavelengths selected for estimation of the soil properties were identical or similar for multiple soil properties. More important wavelengths were selected in the visible-short NIR range (350-1000 nm) and the long NIR range (1800-2500 nm) than in the intermediate NIR range (1000-1800 nm). These results will be useful for design and application of in-situ close range sensors for paddy field soil properties.
정선철(S. C. Jung),서동표(D. P. Seo),황영석(Y. S. Hwang) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Cables installed in harsh area of nuclear power plant have aging mechanisms due to high temperature and high radiation. Degrees of aging are not constant for one cable line since cables pass through many different to get environmental information of cables to find key parameters for evaluating aging condition of cables. ABS(Autodesk Building System) is a kind of Manufacturing Extension Partnership program(MEP) which has a combined function of design, documentation and analysis. This program was designed based on the AutoCAD and ADT(Architectural Desktop) software. ABS program is a 3 dimensional CAD program which is useful for making object based CAD drawing. Equipment, cable tray, cable and etc in building can be treated as objects. Object based drawing can make 3D CAD work fast and efficient. We have developed 3D cable tracking program by using object based CAD program. Since the cable and cable tray is developed as object CAD, it take relatively short time to make 3D drawing of cable lines and cable tray compared with other 3D CAD program. Since we use object data for drawing of 3D cable lines and cable tray, we can easily display the 3 dimensional figures with small data file. Using of small data file makes possible the display of cable lines and cable tray on internet web browser. Environmental information, cable length, cable material, cable life data also can be retrieved by using internet web browser. We expect this 3D cable tracking program will be useful for the management of nuclear power plant cable lines which passing through many areas of power plant.