• Title/Summary/Keyword: 510(k)

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Wiggle Matched Radiocarbon Dates of Wooden Warehouses Excavated at the Bongseon-ri Site in Seocheon, Korea (위글 매치를 이용한 서천 봉선리 유적 출토 목곽고의 방사성탄소연대 측정)

  • Lee, Kwang-Hee;Kim, Su-Chul
    • Journal of Conservation Science
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    • v.34 no.1
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    • pp.31-37
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    • 2018
  • It was estimated that wooden warehouses excavated from Bongseon-ri site in Seocheon were built around the 5th century according to the soil layers and construction methods of earthen structures. In order to identify the exact date, three wooden materials (BSMG 01, 06, and 12) from wooden warehouses were analyzed through radiocarbon dating using wiggle match. The outermost ring of BSMG 01 produced a radiocarbon date (95.4% confidence interval) of AD 431~551, BSMG 06 produced a date of AD 460~570, and BSMG 12 produced dates of either AD 240~430 or AD 490~510. The common age of the three wooden materials was identified as AD 490-510 and coincided with the original estimated archaeological age. Therefore, this study proved the accuracy of radiocarbon dating using wiggle match.

Characterization of Fe Nanocapsules synthesized by Plasma Arc Discharge Process (플라즈마 아크방전(PAD)법으로 제조된 Fe Nanocapsules의 특성)

  • Park Woo-Young;Youn Cheol-Su;Yu Ji-Hun;Oh Young-Woo;Choi Chul-Jin
    • Journal of Powder Materials
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    • v.11 no.6 s.47
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    • pp.510-514
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    • 2004
  • Iron-carbon nanocapsules were synthesized by plasma arc discharge (PAD) process under various atmosphere of methane, argon and hydrogen gas. Characterization and surface properties were investigated by means of HRTEM, XRD, XPS and Mossbauer spectroscopy. Fe nanocapsules synthesized were composed of three phases $({\alpha}-Fe,\;Y-Fe\;and\;Fe_{3}C)$ with core/shell structures. The surface of nanocapsules was covered by the shell of graphite phase in the thickness of $4{\~}5$nm.

Smart Bicycle with Arduino (아두이노를 이용한 자전거 안전 지킴이)

  • Lee, Byeong-Gyu;Park, Jae-Gon;Kwon, Yong-Min;Lee, Sang-Hun;Kim, Joong-Jae
    • Proceedings of the Korea Information Processing Society Conference
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    • 2017.11a
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    • pp.510-513
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    • 2017
  • 자전거 이용자 급증으로 자전거의 도난 및 분실을 방지하여 사용자를 안심시켜주고 주행 중 위험요소를 줄이고자 하는 목소리가 높아지고 있다. 본 논문에서는 애플리케이션 개발을 위해 MCU(Micro Controller Unit)인 Arduino Mega 2560 기반에 블루투스(Bluetooth) 통신 방식을 사용하여 자전거 잠금장치, 위치 추적 장치를 조작하고 후방 감지 장치를 제어하였으며 초음파 거리센서 값을 이용하여 LED Strip 및 진동 모터로 사용자에게 주행 상태를 알리는 장치를 구현하였다.

Employing Laccase-Producing Aspergillus sydowii NYKA 510 as a Cathodic Biocatalyst in Self-Sufficient Lighting Microbial Fuel Cell

  • Abdallah, Yomna K.;Estevez, Alberto T.;Tantawy, Diaa El Deen M.;Ibraheem, Ahmad M.;Khalil, Neveen M.
    • Journal of Microbiology and Biotechnology
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    • v.29 no.12
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    • pp.1861-1872
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    • 2019
  • In the present work, we isolated and identified Aspergillus sydowii NYKA 510 as the most potent laccase producer. Its medium constituents were optimized to produce the highest possible amount of laccase, which was after 7 days at 31℃ and pH 5.2. Banana peel and peptone excelled in inducing laccase production at concentrations of 15.1 and 2.60 g/l, respectively. Addition of copper sulfate elevated enzyme yield to 145%. The fungus was employed in a microbial fuel cell (MFC). The best performance was obtained at 2000 Ω achieving 0.76 V, 380 mAm-2, 160 mWm-2, and 0.4 W. A project to design a self-sufficient lighting unit was implemented by employing a system of 2 sets of 4 MFCs each, connected in series, for electricity generation. A scanning electron microscopy image of A. sydowii NYKA 510 was utilized in algorithmic form generation equations for the design. The mixed patterning and patterned customized mass approach were developed by the authors and chosen for application in the design.