• Title/Summary/Keyword: Metascreen

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Metascreen Analysis Using Generalized Sheet Transition Conditions(GSTCs) and Babinet's Principle (Babinet의 원리와 Generalized Sheet Transition Conditions(GSTCs)를 이용한 메타스크린 해석)

  • Lee, Sun-Gyu;Lee, Jeong-Hae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.9
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    • pp.685-692
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    • 2018
  • Using Babinet's principle and generalized sheet transition conditions(GSTCs), an analysis method for metascreens is proposed. First, the relation of a complementary screen between a metafilm and metascreen with the same dimensions was confirmed using Babinet's principle. These properties were verified by comparing the reflection coefficient of the patch and the transmission coefficient of the mesh. The patch and mesh are the basic structures of metafilms and metascreens, respectively. Based on these findings, it is also confirmed that the reflection coefficient of the patch surface calculated by GSTCs has the same value as the transmission coefficient of the mesh surface. It is expected that the proposed analysis methods can be applied to the magnitude, phase, and polarization of electromagnetic waves in the various unit structures of a given metasurface.

Changes in Isoflavone Contents and Physicochemical Properties of Soybean Leaf Extract by Extraction Conditions (추출조건에 따른 콩잎 추출물의 이소플라본 함량 및 이화학적 특성)

  • Yoon, Jeong-Ah;Kwun, Se-Young;Park, Eun-Hee;Kim, Myoung-Dong
    • Microbiology and Biotechnology Letters
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    • v.47 no.1
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    • pp.64-68
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    • 2019
  • To utilize soybean leaf, which is a waste product in soybean production, as a value-added food material, this study aimed to investgate the extraction efficiency of isoflavone from soybean leaf and to characterize physicochemical properties of the extract. Maximum isoflavone content of $59.74{\pm}4.54mg/l$ was obtained from soybean leaf extracted at $90^{\circ}C$ for 12 h. DPPH (1,1-diphenyl-2-pricylhydrazyl) radical-scavenging activity and total polyphenol contents reached maximum levels of $67.26{\pm}3.64%$ and $1,688.68{\pm}97.37{\mu}g/ml$ chlorogenic acid equivalent, respectively. Based on the contents of isoflavone and total polyphenol, and DPPH radical-scavenging activity, optimum extraction conditions for soybean leaf using water as solvent were $90^{\circ}C$ and 12 h.