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Interlayer-state-driven superconductivity inCaC6studied by angle-resolved photoemission spectroscopy
Kyung, Wonshik,Kim, Yeongkwan,Han, Garam,Leem, Choonshik,Kim, Chul,Koh, Yoonyoung,Kim, Beomyoung,Kim, Youngwook,Kim, Jun Sung,Kim, Keun Su,Rotenberg, Eli,Denlinger, Jonathan D.,Kim, Changyoung American Physical Society 2015 Physical review. B, Condensed matter and materials Vol.92 No.22
Kim, Namdong,Lee, Paengro,Kim, Youngwook,Kim, Jun Sung,Kim, Yongsam,Noh, Do Young,Yu, Seong Uk,Chung, Jinwook,Kim, Kwang S. American Chemical Society 2014 ACS NANO Vol.8 No.2
<P>We employed graphene as a patternable template to protect the intrinsic surface states of thin films of topological insulators (TIs) from environment. Here we find that the graphene provides high-quality interface so that the Shubnikov de Haas (SdH) oscillation associated with a topological surface state could be observed at the interface of a metallic Bi<SUB>2</SUB>Se<SUB>3</SUB> film with a carrier density higher than ∼10<SUP>19</SUP> cm<SUP>–3</SUP>. Our <I>in situ</I> X-ray diffraction study shows that the Bi<SUB>2</SUB>Se<SUB>3</SUB> film grows epitaxially in a quintuple layer-by-layer fashion from the bottom layer without any structural distortion by interfacial strain. The magnetotransport measurements including SdH oscillations stemming from multiple conductance channels reveal that the topological surface state, with the mobility as high as ∼0.5 m<SUP>2</SUP>/(V s), remains intact from the graphene underneath without degradation. Given that the graphene was prepatterned on arbitrary insulating substrates, the TI-based microelectronic design could be exploited. Our study thus provides a step forward to observe the topological surface states at the interface without degradation by tuning the interface between TI and graphene into a measurable current for device application.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-2/nn405503k/production/images/medium/nn-2013-05503k_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn405503k'>ACS Electronic Supporting Info</A></P>
Youngwook Kim,Nicholas Rech,Talin Louder,Eadric Bressel 대한운동학회 2022 아시아 운동학 학술지 Vol.24 No.3
OBJECTIVES To investigate the relationships among intramuscular cooling rates during (IM cooling rate) and after cold water immersion (CWI) (Post-IM cooling rate), skin tissue cooling rate during CWI (skin cooling rate), and anthropometric characteristics, and develop prediction models to assist clinical decision making. METHODS After a 30-min cycling trial, 16 young healthy adults received a CWI treatment (10 °C) until either intramuscular thigh temperature (2 cm sub-adipose) of the rectus femoris decreased 7 °C below preexercise level or 30 minutes was reached. Temperatures were recorded using skin and implantable finewire thermocouples. Before the cycling trial, %BF, anterior thigh adipose tissue thickness, muscle thickness, total thigh volume, and thigh circumference were measured. Pearson’s correlation coefficients were used to determine significant predictors of IM and Post-IM cooling rates (cooling rate: the amount of temperature reduction per minute). All predictors, including skin cooling rate, %BF, adipose tissue thickness, muscle thickness, total thigh volume, and thigh circumference, were included in multiple linear regression models to figure out factors that best predict the IM and Post-IM cooling rates. RESULTS Correlation analysis demonstrated significant correlations between IM cooling rate and skin cooling rate (r=.85), %BF (r=-.79), and adipose tissue thickness (r=-.79), and between Post-IM cooling rate and thigh circumference (r=-.68), adipose tissue thickness (r=-.58), total thigh volume (r=-.56), and %BF (r=-.53). Regression models identified skin cooling rate and %BF to have the greatest predictability for IM cooling rate (R2=.82) and muscle thickness and thigh circumference to have the greatest predictability for the Post-IM cooling rate (R2=.68). CONCLUSIONS This study provides justification for the use of skin cooling rates during CWI and %BF to estimate IM cooling rate and muscle thickness and thigh circumference to estimate Post-IM cooling rate. These findings will help practitioners to determine the duration of CWI treatment after exercise.
Youngwook Kim,Seongbae Kong,Sung-Kwan Joo 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
This paper presents a stochastic method for an electric vehicle (EV) aggregator to coordinate EV charging schedule considering uncertainty in EV departures. The EV aggregator is responsible for managing the charging schedule of EVs while participating in the electricity markets. The managed EV charging can provide additional revenues to the aggregator from regulation market participation and charging cost reductions to EV owners. The aggregator needs to coordinate the charging schedule considering various uncertain factors such as electricity market prices and the stochastic characteristics of EVs. In this paper, the EV charging scheduling problem incorporating uncertainty in EV departures is formulated as a stochastic optimization problem. A stochastic optimization method is used to solve the EV charging scheduling problem. Latin hypercube sampling (LHS) and a scenario-reduction method are also applied to reduce the computational efforts of the proposed method. The results of a numerical example are presented to show the effectiveness of the proposed stochastic EV charging coordination method.