• Title/Summary/Keyword: A380

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A Smart Teaching Medel using Cloud Computing Service (클라우드 컴퓨팅 서비스를 활용한 스마트교육 모형)

  • Park, Phan-Woo
    • Proceedings of the Korea Contents Association Conference
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    • 2012.05a
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    • pp.379-380
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    • 2012
  • WWW 2.0 서비스 중에서 클라우드 컴퓨팅 서비스를 활용한 스마트교육 학습 모형에 관하여 연구한다. 클라우드 컴퓨팅 서비스를 활용한 교수 학습 모델을 제시하고 이를 학교 현장에서 활용하는 방안을 제시하고자 한다.

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Effect of Clay-Mineral Composition on Flexural Strength of Clay-based Membranes (점토 광물 조성이 점토기반 분리막의 곡강도에 미치는 영향)

  • Lee, Young-Il;Eom, Jung-Hye;Kim, Young-Wook;Song, In-Hyuck
    • Journal of the Korean Ceramic Society
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    • v.51 no.5
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    • pp.380-385
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    • 2014
  • Clay-based membranes with submicron pore size were successfully prepared by a simple pressing process using low-cost starting materials(e.g., kaolin (K), bentonite (B), talc (T), and sodium borate). The green bodies were sintered at $1000^{\circ}C$ for 2 h in air. The effect of clay-mineral composition on the flexural strength of clay-based membranes was investigated. The porosity of the clay-based membranes could be controlled within the range of 34 - 42% by adjusting the starting composition. The flexural strength of the low-cost membranes depended on both the porosity and the ${\alpha}$-quartz content. In turn, the porosity and ${\alpha}$-quartz content were affected by the (B+T) /(K+B+T) ratio. The plot of strength relative to this ratio, showed a maximum when the ratio was 0.4. The typical flexural strength of these clay-based membranes (with ratio 0.4) was 28 MPa at 34% porosity.

Peptide Hydrolysates from Astragalus membranaceus Bunge Inhibit the Expression of Matrix Metalloproteinases in Human Dermal Fibroblasts

  • Park, Sun Ki;Van Hien, Pham;Van Luong, Hoang;Yan, Shao-Wei;Byun, Sang Yo
    • KSBB Journal
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    • v.29 no.5
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    • pp.380-384
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    • 2014
  • Inhibition effects of peptide hydrolysates from Astragalus membranaceus Bunge. on the expression of the matrix metalloproteinases (MMPs) in human dermal fibroblasts were evaluated in vitro. Crude peptides were obtained by the hydrolysis of proteins extracted from A. membranaceus. Peptides were purified partially by the basis on the molecular weight using 40% polyacrylamide gel electrophoresis before treatment with human dermal fibroblasts. Basis on the doseeffect experiments, expressions of MMPs including MMP-1, MMP-3, MMP-8, MMP-13 in human dermal fibroblasts were evaluated. Expressions of MMP-1, MMP-3, MMP-8 and MMP-13 were reduced in 43%, 5%, 22% and 57% respectively. The mass spectrometric analysis of partially purified peptides from A. membranaceus, which strongly inhibit expressions of MMPs, indicated that the peptides were composed of molecules below 1500 Da.