• Title/Summary/Keyword: 근적상

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Design of Pattern Classifier for Electrical and Electronic Waste Plastic Devices Using LIBS Spectrometer (LIBS 분광기를 이용한 폐소형가전 플라스틱 패턴 분류기의 설계)

  • Park, Sang-Beom;Bae, Jong-Soo;Oh, Sung-Kwun;Kim, Hyun-Ki
    • Journal of the Korean Institute of Intelligent Systems
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    • v.26 no.6
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    • pp.477-484
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    • 2016
  • Small industrial appliances such as fan, audio, electric rice cooker mostly consist of ABS, PP, PS materials. In colored plastics, it is possible to classify by near infrared(NIR) spectroscopy, while in black plastics, it is very difficult to classify black plastic because of the characteristic of black material that absorbs the light. So the RBFNNs pattern classifier is introduced for sorting electrical and electronic waste plastics through LIBS(Laser Induced Breakdown Spectroscopy) spectrometer. At the preprocessing part, PCA(Principle Component Analysis), as a kind of dimension reduction algorithms, is used to improve processing speed as well as to extract the effective data characteristics. In the condition part, FCM(Fuzzy C-Means) clustering is exploited. In the conclusion part, the coefficients of linear function of being polynomial type are used as connection weights. PSO and 5-fold cross validation are used to improve the reliability of performance as well as to enhance classification rate. The performance of the proposed classifier is described based on both optimization and no optimization.

Effect of Light Transmission on Composition and Somatic Cell count of Raw Milk (분광된 빛의 주사가 원유내 성분에 미치는 영향)

  • Ko, Han-Jong;Kim, Ki-Youn;Min, Young-Bong;Nishizu, Takahisa;Yun, Yong-Chul;Kim, Hyeon-Tae
    • Journal of agriculture & life science
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    • v.46 no.1
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    • pp.189-194
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    • 2012
  • Measurement of compositions and somatic cells in raw milk by chemical methods usually requires a lot of time, skilled labor and expensive analytical equipments. Recently, near-infrared reflectance spectroscopy (NIRS), which is a rapid, cost-effective and non-destructive technique, has been extensively used for safety and quality evaluation in the field of dairy products. However, less study has been performed to evaluate the effect of transmitted light on milk quality during NIRS analysis. Therefore, the objective of this study was to analyze the changes in milk quality using transmitted light. Raw milk samples collected from dairy farm from Siga prefecture in Japan were analyzed for fat, protein, lactose, solids not fat, total solids, milk urea and citric acid using the Milko scan 4000. Somatic cells in raw milk samples were counted by the Fossomatic 5000. Transmittance spectra of 50 ml raw milk samples were obtained by the Lax-Cute lighter in the 400 nm or less, 689 nm, 773 nm, 900 nm and 979 nm. As a result, milk fat as well as somatic cell count was increased by 2.6% and 9.0%, respectively. The other compositions were, however, changed within the relative error of the measurement. Further studies are needed to apply raw milk quality evaluation using the UV band by accumulating more samples and more data.

Magnetic and Magneto-Optical Properties of $Mn_{1-x}Cr_xPt_3$ Ordered Alloy Films ($Mn_{1-x}Cr_xPt_3$ 박막의 자기 및 자기광학 특성)

  • 박문기;조재경
    • Journal of the Korean Magnetics Society
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    • v.8 no.6
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    • pp.374-379
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    • 1998
  • $Mn_1-xCr_xPt_3$ alloy films have been prepared by depositing (Mn, Cr)/Pt multilayers using a rf magnetron sputterer followed by heat treatment. Small and wide angle x-ray diffractometry, magnetic hysteresis loops and Kerr rotation angle spectra of the films have been measured and used to investigate structural, magnetic and magneto-optic properties of the films. The films had a crystal structure of ordered AuCu$_3$ type and the strong preferred orientation of a (111)plane parallel to the film surface. The saturation magnetization of the films was decreased with Cr content reaching almost zero near x=0.58 and then increased for further increasement of Cr content up to x=0.77 over that stayed almost constant. This indicated that Cr atoms were antiferromagnetically coupled with Mn atoms. The magnetic easy axis of MnPt$_3$(x=0) film was parallel to the film surface but those of the films with x$\geq$0.58 increased as Cr content increased reaching about 4 kOe at x=1(CrPt$_3$). The dependence of the Kerr rotation angle on the Cr content was similar to that of the saturation magnetization on the Cr content. The films with x=0.77 and x=1 showed the larger Kerr rotation angle at the wavelengths of near infrared compared to the magneto-optic recording medium, TbFeCo, currently being used.

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High-power Yb Fiber Laser with 3.0-kW Output (3.0 kW 고출력 발진 단일 모드 Yb 광섬유 레이저)

  • Park, Jong Seon;Park, Eun Ji;Oh, Ye Jin;Jeong, Hoon;Kim, Ji Won;Jung, Yeji;Lee, Kangin;Lee, Yongsoo;Cho, Joonyong
    • Korean Journal of Optics and Photonics
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    • v.32 no.4
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    • pp.147-152
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    • 2021
  • We report high-power continuous-wave operation of a Yb-doped fiber laser at 1070 nm, pumped by high-power laser diodes at 976 nm. Based on theoretical calculation of the stimulated Raman scattering and temperature distribution in the fiber, we construct a bidirectionally pumped Yb-fiberlaser system incorporating a pair of fiber Bragg gratings and a cladding light stripper. The fiber laser yields 3.0 kW of continuous-wave output at 1070 nm in a diffraction-limited beam with M2 ≈ 1.26 for 4.1 kW of incident pump power, corresponding to a slope efficiency of 81.5%. The prospects for further power scaling are discussed.

Effect of Hollow Sphere Size on Heat Shield Properties of hollow TiO2/polyacrylate Composites (중공구의 크기에 의한 hollow TiO2/polyacrylate 복합체의 열차단 특성)

  • Kim, Jong Seok
    • Applied Chemistry for Engineering
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    • v.32 no.6
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    • pp.690-694
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    • 2021
  • Carbon spheres (CS) were fabricated using glucose as a precursor in the hydrothermal method. Hollow TiO2 (H-TiO2) spheres with 200 nm, 500 nm, and 1,200 nm were synthesized by CS/TiO2 core-shell particles via a sol-gel and calcination method. H-TiO2 spheres with nano and micron sizes were characterized using FE-SEM, HR-TEM, and X-ray diffraction. The CIE color coordinate, solar reflectance, and heat shield temperatures of H-TiO2/polyacrylate (PA) composite film were investigated using a UV-Vis-NIR spectrometer and homemade heat insulation temperature measuring device. H-TiO2/PA composites exhibit excellent thermal insulation since the hollow structure filled with dry air has low thermal conductivity and near infrared light reflecting performance. The thermal insulation increased with increasing the hollow sphere (HS) size on H-TiO2/PA composites. The PA composite film mixed with H-TiO2 filled with 1200 nm HS reduced the heat shield temperature by 26 ℃ compared to that of the transparent glass counterpart.

Development of Prediction Model for Sugar Content of Strawberry Using NIR Spectroscopy (근적외선 분광을 이용한 딸기의 당도예측모델 개발)

  • Son, Jaeryong;Lee, Kangjin;Kang, Sukwon;Yang, Gilmo;Seo, Youngwook
    • Food Engineering Progress
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    • v.13 no.4
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    • pp.297-301
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    • 2009
  • This study was performed to develop a prediction model of sugar content for strawberry. Near-infrared (NIR) spectroscopy has been prevailed for on-line and portable applications for non-invasive quality assessment of intact fruit. This work presents effects of illumination method and coating of reflection surface of light source on prediction result of sugar content. Effect of preprocessing methods was also examined. A low-cost commercially available VIS/NIR spectrometer was used for estimation of total soluble solids content (Brix). To predict sugar contents of strawberry, the best results were obtained with the spectrum data measured under intensive illuminations at three locations induced from the light source with fiber optic bundles. Gold coating of reflection surface of light source lamp gave favorable effect to prediction result. The best results in validation of PLSR model were $r_{SEP}$ = 0.891 and SEP = 0.443 Brix under OSC preprocessing and those of PCR were $r_{SEP}$ = 0.845, SEP $r_{SEP}$= 0.520 Brix, under no preprocessing.

Evaluation of Rededge-M Camera for Water Color Observation after Image Preprocessing (영상 전처리 수행을 통한 Rededge-M 카메라의 수색 관측에의 활용성 검토)

  • Kim, Wonkook;Roh, Sang-Hyun;Moon, Yongseon;Jung, Sunghun
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.37 no.3
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    • pp.167-175
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    • 2019
  • Water color analysis allows non-destructive estimation of abundance of optically active water constituents in the water body. Recently, there have been increasing needs for light-weighted multispectral cameras that can be integrated with low altitude unmanned platforms such as drones, autonomous vehicles, and heli-kites, for the water color analysis by spectroradiometers. This study performs the preprocessing of the Micasense Rededge-M camera which recently receives a growing attention from the earth observation community for its handiness and applicability for local environment monitoring, and investigates the applicability of Rededge-M data for water color analysis. The Vignette correction and the band alignment were conducted for the radiometric image data from Rededge-M, and the sky, water, and solar radiation essential for the water color analysis, and the resultant remote sensing reflectance were validated with an independent hyperspectral instrument, TriOS RAMSES. The experiment shows that Rededge-M generally satisfies the basic performance criteria for water color analysis, although noticeable differences are observed in the blue (475 nm) and the near-infrared (840 nm) band compared with RAMSES.

High-power Operation of a Yb Fiber Laser at 1018 nm (1018 nm 파장의 고출력 Yb 광섬유 레이저)

  • Oh, Ye Jin;Park, Hye Mi;Park, Jong Seon;Park, Eun Ji;Kim, Jin Phil;Jeong, Hoon;Kim, Ji Won;Kim, Tae Hyoung;Jeong, Seong Mook;Kim, Ki Hyuck;Yang, Hwan Seok
    • Korean Journal of Optics and Photonics
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    • v.32 no.5
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    • pp.209-214
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    • 2021
  • High-power continuous-wave operation of a Yb-doped double-clad fiber laser at 1018 nm, pumped by high-power diode lasers at 976 nm, is reported. Based on numerical calculation of the gain and laser signal power along the length of the Yb fiber, it is found that robust operation at 1018 nm can be achieved for a high Yb3+-ion excitation density greater than 11.5%, accompanied by high suppression of the feedback from the fiber's end facet. The Yb fiber laser constructed in house yields 626 W of continuous-wave output at 1018 nm for 729 W of incident pump power, corresponding to a slope efficiency of 86.6%. The prospect for power scaling is considered.

Discrimination of Internally Browned Apples Utilizing Near-Infrared Non-Destructive Fruit Sorting System (근적외선 비파괴 과일 선별 시스템을 활용한 내부 갈변 사과의 판별)

  • Kim, Bal Geum;Lim, Jong Guk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.22 no.1
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    • pp.208-213
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    • 2021
  • There is a lack of studies comparing the internal quality of fruit with its external quality. However, issues of internal quality of fruit such as internal browning are important. We propose a method of classifying normal apples and internally browned apples using a near-infrared (NIR) non-destructive system. Specifically, we found the optimal wavelength and characteristics of the spectra for determining the internal browning of Fuji apples. The NIR spectra of apples were obtained in the wavelength range of 470-1150 nm. A group of normal apples and a group of internally browned apples were identified using principal component analysis (PCA), and a partial least squares regression (PLSR) analysis was performed to develop and evaluate the discriminant model. The PCA analysis revealed a clear difference between the normal and internally browned apples. From the PLSR, the correlation coefficient of the predictive model without pretreatment was determined to be 0.902 with an RMSE value of 0.157. The correlation coefficient of the predictive model with pretreatment was 0.906 with an RMSE value of 0.154. The results show that this model is suitable for classifying normal and internally browned apples and that it can be applied for the sorting and evaluation of agricultural products for internal and external defects.

Detection of the Coastal Wetlands Using the Sentinel-2 Satellite Image and the SRTM DEM Acquired in Gomsoman Bay, West Coasts of South Korea (Sentinel-2 위성영상과 SRTM DEM을 활용한 연안습지 탐지: 서해안 곰소만을 사례로)

  • CHOUNG, Yun-Jae;KIM, Kyoung-Seop;PARK, Insun
    • Journal of the Korean Association of Geographic Information Studies
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    • v.24 no.2
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    • pp.52-63
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    • 2021
  • In previous research, the coastal wetlands were detected by using the vegetation indices or land cover classification maps derived from the multispectral bands of the satellite or aerial imagery, and this approach caused the various limitations for detecting the coastal wetlands with high accuracy due to the difficulty of acquiring both land cover and topographic information by using the single remote sensing data. This research suggested the efficient methodology for detecting the coastal wetlands using the sentinel-2 satellite image and SRTM(Shuttle Radar Topography Mission) DEM (Digital Elevation Model) acquired in Gomsoman Bay, west coasts of South Korea through the following steps. First, the NDWI(Normalized Difference Water Index) image was generated using the green and near-infrared bands of the given Sentinel-2 satellite image. Then, the binary image that separating lands and waters was generated from the NDWI image based on the pixel intensity value 0.2 as the threshold and the other binary image that separating the upper sea level areas and the under sea level areas was generated from the SRTM DEM based on the pixel intensity value 0 as the threshold. Finally, the coastal wetland map was generated by overlaying analysis of these binary images. The generated coastal wetland map had the 94% overall accuracy. In addition, the other types of wetlands such as inland wetlands or mountain wetlands were not detected in the generated coastal wetland map, which means that the generated coastal wetland map can be used for the coastal wetland management tasks.