• Title/Summary/Keyword: %5E-%24

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Selection of Vertiport Location, Route Setting and Operating Time Analysis of Urban Air Mobility in Metropolitan Area (수도권 도심항공 모빌리티 수직이착륙장 위치 선정, 경로 설정 및 운행 소요시간 분석)

  • Oh, Jae-Seok;Hwang, Ho-Yon
    • Journal of Advanced Navigation Technology
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    • v.24 no.5
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    • pp.358-367
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    • 2020

  • With the increases of average commuting time of office workers in the Seoul metropolitan area and the cost of traffic congestion on roads, the need for new transportation is increasing and urban air mobility (UAM) is emerging as an alternative. Therefore, in this paper, the vertiport locations were selected and routes were established using population, traffic and commuting data of Seoul and Gyeonggi Province. Vector thrust type and multicopter type of eVTOL compatible for UAM were selected by analyzing the types of eVTOLand time required for selected routes was calculated. In addition, the time required when we utilize other transportations was compared with UAM. Finally, it was verified that the commuting time can be sharply reduced when we use UAM.

  • https://doi.org/10.12673/jant.2020.24.5.358 인용 PDF KSCI

Effects of Inhibiting Glycoprotein MUC5AC by Seaweed Ecklonia cava Extract in human Airway Epithelial Cells

  • Lee, Sung-Gyu;Kwon, Sang-Oh
    • Biomedical Science Letters
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    • v.27 no.4
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    • pp.334-339
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    • 2021

  • In the present study, antioxidant and MUC5AC mucin inhibition activities were measured in Ecklonia cava (E. cava) extract. The E. cava extract showed the total polyphenol and flavonoid contents of 607.40±19.44 ㎍ GAE/mg and 13.33±5.28 ㎍ QE/mg, respectively. The free radical scavenging activity of E. cava extract was high in the DPPH radical scavenging activity (RC50 7.08 ㎍/mL) and ABTS+ radical scavenging activity (RC50 4.74 ㎍/mL). Also, we investigated whether E. cava extract affects airway MUC5AC mucin gene expression, production and secretion induced by phorbol 12-myristate 13-acetate (PMA) from NCI-H292 cells. Cells were treated with E. cava extract and then stimulated with PMA for 24 h. The E. cava extract inhibited the gene expression of MUC5AC mucin from NCI-H292 cells. This result suggests that E. cava extract can inhibit the gene expression of mucin induced by PMA through directly acting on airway epithelial cells.

  • https://doi.org/10.15616/BSL.2021.27.4.334 인용 PDF KSCI

A Study on the Yolk Absorption and Early Growth in the Alevin of Rainbow Trout, Oncorhynchus mykiss (무지개송어, Oncorhynchus mykiss 자어의 난황흡수 및 초기성장에 관한 연구)

  • Park, In-Seok;Im, Jae-Hyun;Zhang, Chang-Ik
    • Korean Journal of Ichthyology
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    • v.8 no.1
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    • pp.49-55
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    • 1996

  • The growth of total length(TL), total weight(TW) and somatic weight(SW) of rainbow trout, Oncorhynchus mykiss alevin at yolk absorption period was expressed by the Gompertz growth model as $TLt=2.7e^{-1.24{\cdot}e^{-0.11t}}(r^{2}=0.66)$, $TWt=1.8e^{-2.03{\cdot}e^{-0.11t}}(r^{2}=0.66)$ and $SWt=1.8e^{-5.41{\cdot}e^{-0.13t}}(r^{2}=0.83)$ respectively. Yolk length, yolk height and yolk volume of rainbow trout decreased linearly. The relative growth of total weight-total length, somatic weight-total length, yolk length-total length, yolk height-total length, yolk volume-total length, yolk weight-total length, yolk weight-total weight, yolk weight-yolk height and yolk weight-yolk length at yolk absorption period revealed the pattern of yolk absorption in rainbow trout.

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