• Title/Summary/Keyword: DO-160

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A new record of brown algae, Papenfussiella densa from Dok-do, Korea

  • Won, Boo Yeon
    • Korean Journal of Environmental Biology
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    • v.38 no.1
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    • pp.160-164
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    • 2020

  • Papenfussiella densa was described as Papenfussiella kuromo f. densa from Japan by Inagaki in 1958. P. densa has been recognized as an endemic and independent species based on the molecular analyses of type material without detailed morphological observations. In this study, Papenfussiella densa is reported as a new record from Dok-do, South Korea, based on morphological and molecular analyses. Papenfussiella densa is mainly characterized as having narrow, branched, slimy, and tomentose thalli with branchlets, partially hollow in the medulla of the middle part. The molecular analyses of the chloroplast rbcL-rbcS DNA sequence of the Papenfussiella densa sample from Korea revealed that it matched that of P. densa from Japan and was nested in the clade of Papenfussiella. There was only a 0.02% gene sequence divergence between the Korean and Japanese samples. We report P. densa as a new record from Korea and add this species to the list of Korean macroalgal flora.

  • https://doi.org/10.11626/KJEB.2020.38.1.160 인용 PDF KSCI

Development and Verification of Lightning Induced Transient Protection Device for Avionics Computer (항공기 탑재 컴퓨터용 간접낙뢰 보호장치 개발 및 검증)

  • Sim, Yong-gi;Ahn, Tae-sik;Park, Jun-hyun;Han, Jong-pyo;Yang, Seo-hee
    • Journal of Advanced Navigation Technology
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    • v.19 no.5
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    • pp.395-402
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    • 2015

  • This paper introduces the design details and test procedures of the lightning induced transient protection device for protecting the damage caused by indirect lightning strike on the computer mounted on the aircraft. Lightning induced surge voltage is bring a malfunction or damage to the aircraft electrical and electronic equipment, that is referred to indirect effects of lightning. In order to protect the electronic equipment on aircraft from the indirect effects of lightning, that is achieved by analyzing the effect on aircraft from lightning and protect design for each devices. In this paper, we introduce an indirect lightning strike level decisions, the protection circuit design method according to the chosen level through the RTCA DO-160G Section 22 category analysis and selection was performed in order to protect the damage caused by indirect lightning strikes in the protected equipment. In addition, we show the indirect lightning effects verification test performed to validate the designed protection circuits.

  • https://doi.org/10.12673/jant.2015.19.5.395 인용 PDF KSCI

Phylogenetic Analysis of Dendropanax morbifera Using Nuclear Ribosomal DNA Internal Transcribed Spacer (ITS) Region Sequences (Internal transcribed spacer (ITS) region의 염기서열 분석에 의한 보길도산 황칠나무의 분자 계통학적 연구)

  • Shin, Yong Kook
    • Journal of Life Science
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    • v.26 no.11
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    • pp.1341-1344
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    • 2016

  • Dendropanax morbifera is an endemic tree species of Korea, it is restricted to the southern parts of Korea. The internal transcribed spacer (ITS) region of nuclear ribosomal DNA (nrDNA) for Dendropanax morbifera grown at Bogil-do, Korea was determined. We investigated the sequence-based phylogenetic relationships of plants related and clarified its taxonomical position. The determined sequences consisted of 689 residues. ITS1 was 222 bp long while ITS2 was 233 bp long. The 5.8S rDNA was 160 bp long. The ITS region sequences of the Dendropanax species included in this study were obtained from GenBank. Oreopanax polycephalus was used as the outgroup. A pairwise alignment was calculated using the Clustal X program. A phylogenetic tree was constructed by the neighbor-joining method using the Tree view program. Sequence similarities among species including D. morbifera Bogil-do isolate showed the range 92.6 to 99.7% in sequence-based phylogenetic analysis using total 615 base pairs of ITS1, 5.8S rDNA and ITS2. D. morbifera Bogil-do isolate exhibited the highest degree of relatedness to D. chevalieri, sharing 99.7% ITS region similarity. D. morbifera Bogil-do isolate also showed to D. trifidus, sharing 99.4% ITS region similarity.

  • https://doi.org/10.5352/JLS.2016.26.11.1341 인용 PDF KSCI