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Inductance and Torque Characteristics Analysis of Multi-Layer Buried Magnet Synchronous Machines
Kwak, Sang-Yeop,Kim, Jae-Kwang,Jung, Hyun-Kyo The Korean Institute of Electrical Engineers 2004 KIEE International Transactions on Electrical Mach Vol.b4 No.4
Inductance characteristics, torque variations and ripple according to current, and position of multi-layer buried magnet synchronous machines with field-weakening operations are presented. The rotor structure optimal design of a buried magnet synchronous machine with high performance is investigated, and optimization results and comparison among design candidates are shown. For the fast and accurate search of multiple optima, the auto-tuning niching genetic algorithm is used and a final solution is selected considering various design factors.
Park, Sung Yong,Chung, Jae Woo,Chae, Young Kee,Kwak, Seung-Yeop American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.21
<P>We develop sustainable anti-biofouling ultrafiltration membrane nanocomposites by covalently immobilizing silver nanoparticles (AgNPs) onto poly(vinylidene fluoride) (PVDF) membrane mediated by a thiol-end functional amphiphilic block copolymer linker. Field emission scanning electron microscopy (FE-SEM) and energy-dispersive X-ray spectroscopy (EDXS) measurements reveal that the AgNPs are highly bound and dispersed to the PVDF membrane due to the strong affinity of the AgNPs with the thiol-modified block copolymeric linkers, which have been anchored to the PVDF membrane. The membrane performs well under water permeability and particle rejection measurements, despite the high deposition of AgNPs on the surface of membrane. The Ag-PVDF membrane nanocomposite significantly inhibits the growth of bacteria on the membrane surface, resulting in enhanced anti-biofouling property. Importantly, the AgNPs are not released from the membrane surface due to the robust covalent bond between the AgNPs and the thiolated PVDF membrane. The stability of the membrane nanocomposite ensures a sustainable anti-biofouling activity of the membrane.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-21/am402855v/production/images/medium/am-2013-02855v_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am402855v'>ACS Electronic Supporting Info</A></P>
Estimation of Measurement Uncertainty in Vitamin D Analysis from Domestic Foods
Jun-Yeop Lee,Chang-Wan Lim,Kwang-Eun Jung,Byung-Man Kwak,Ki-Woong Lee,Young-Min Choi,Jin-Ju Park,Sang-Hoon Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Contents of vitamin D in domestic foods were analyzed by high performance liquid chromatography tandem mass spectrometer. The uncertainty of measurement was estimated based on GUM (guide to the expression of uncertainty in measurement) and the Draft EURACHEM/CITAC Guide. The sources of measurement uncertainty, such as sample weight, final sample volume, standard solution, calibration curve and the repeatability, were identified. And that was evaluated for type A and B uncertainty then used as parameters to determine the combined standard uncertainty. An expanded uncertainty was calculated by multiplying the combined standard uncertainty with a coverage factor (k) calculated from the degree of freedom. The content of vitamin D₃ from Squid was 2.34 μg/100 g and the expanded uncertainty by multiplying by the coverage factor (k=2) was 0.11 μg/100 g at approximately 95% confidence level. The most influential uncertainty sources were repeatability and calibration curve.
600 kJ SMES용 열 전도판의 구조에 따른 와전류 손실 특성
이상엽(Sang-Yub Lee),곽상엽(Sang-Yeop Kwak),박명진(Myung-Jin Park),김우석(Woo-Seok Kim),이지광(Ji-Kwang Lee),최경달(Kyeong-Dal Choi),배준한(Joon-Han Bae),김석호(Seok-Ho Kim),심기덕(Ki-Duk Sim),성기철(Ki-Chul Seong),정현교(Hyun-Kyo Ju 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
본 논문에서는 600kJ급 SMES용 열전도판의 와전류 손실의 해석에 대해서 나타내었다. SMES의 운전 상태는 충전, 운전, 방전의 3가지 구간으로 나누어 볼 수 있다. 이 중 방전 구간에서는 SMES 코일에서의 전류 감소에 의해서 와전류 손실이 발생한다. 이때 발생하는 와전류 손실은 짧은 시간동안 발생하지만 그 크기가 크기 때문에, SMES 시스템 설계 시 냉각 시스템의 효율과 안정성을 위해서 반드시 고려되어야만 한다. 본 논문에서는 이러한 열전도판의 와전류 손실을 해석하고, 그 형상의 변화에 따른 와전류 손실 값들을 분석하였다.