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Polarization-sensitive OFDI using polarization-multiplexed wavelength-swept laser.
Cho, Han Saem,Oh, Wang-Yuhl Optical Society of America 2014 Optics letters Vol.39 No.14
<P>We demonstrate a novel polarization-sensitive optical frequency domain imaging system employing passive polarization multiplexing. Simple modification of a fiber delay line in the wavelength-swept light source enables illumination with two perpendicular polarizations that are required for determination of the Stokes vector components of the light reflected from each depth of the tissue. This simple all-passive approach provides a robust and low-cost solution for PS imaging replacing relatively complex conventional schemes such as polarization modulation or frequency-encoded polarization multiplexing.</P>
Formulation Prediction for Young's Modulus of Poly(dimethylsiloxane) by Spectroscopic Methods
Cho Han Saem,Moon Heh‐Young,Lee Heung Soon,Kim Yong Tae,Jeoung Sae Chae 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.9
In this work, we refer to the fraction of hydrides and vinyl groups consumed in cross-linking reaction as a variation of the properties of poly(dimethylsiloxane) (PDMS) with varying the formulation of a curing agent from 3.2 wt % to 50 wt %. Young’s modulus, density, and refractive indices of PDMS were observed to have a maxima at a formulation of about 10 wt % of cross linker. The intensity of the Raman band for the Si H stretching mode in cross-linker is almost zero if the cross-linking agent is less than 10 wt %, but it is linearly increasing with increasing the content of cross-linker. The dependence of the elastic modulus on the formulation could be explained in terms of the fraction of cross-linked network. The analytical framework proposed in this work could be used for optimizing the formulation of PDMS and hence its properties can be tailored for specific applications.
Jeong, Han Saem,Hong, Soon Jun,Cho, Sang-A,Kim, Jong-Ho,Cho, Jae Young,Lee, Seung Hun,Joo, Hyung Joon,Park, Jae Hyoung,Yu, Cheol Woong,Lim, Do-Sun American College of Cardiology 2017 JACC. Cardiovascular interventions Vol.10 No.16
<P>CONCLUSIONS Compared with prasugrel, ticagrelor significantly decreased inflammatory cytokines such as interleukin 6 and tumor necrosis factor alpha and increased circulating EPCs, contributing to improved arterial endothelial function in diabetic non-ST-segment elevation acute coronary syndrome patients. Thus, data support that pleiotropic effects of ticagrelor beyond its potent antiplatelet effects could contribute to additional clinical benefits. (C) 2017 by the American College of Cardiology Foundation.</P>
RuO<sub>2</sub> nanocluster as a 4-in-1 electrocatalyst for hydrogen and oxygen electrochemistry
Park, Han-Saem,Yang, Juchan,Cho, Min Kyung,Lee, Yeongdae,Cho, Seonghun,Yim, Sung-Dae,Kim, Byeong-Su,Jang, Jong Hyun,Song, Hyun-Kon unknown 2019 Nano energy Vol.55 No.-
<P><B>Abstract</B></P> <P>Partially hydrous RuO<SUB>2</SUB> nanocluster embedded in a carbon matrix (<I>x</I>-RuO<SUB>2</SUB>@C with <I>x</I> = hydration degree = <I>0.27</I> or <I>0.27</I>@C) is presented as a bifunctional catalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for water splitting. Symmetric water electrolyzers based on <I>0.27</I>-RuO<SUB>2</SUB>@C for both electrodes showed smaller potential gaps between HER and OER at pH 0, pH 14 and even pH 7 than conventional asymmetric electrolyzers based on two different catalysts (Pt/C || Ir/C) that have been known as the best catalysts for HER and OER respectively. Moreover, <I>0.27</I>-RuO<SUB>2</SUB>@C showed another bifunctional electroactivity for fuel cell electrochemistry involving hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) that are the backward reactions of HER and OER respectively. Pt-level HOR electroactivity was obtained from <I>0.27</I>-RuO<SUB>2</SUB>@C, while its ORR activity was inferior to that of Pt with 200 mV higher overpotential required. The tetra-functionality of <I>0.27</I>-RuO<SUB>2</SUB>@C showed the possibility of realizing single-catalyst regenerative fuel cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report a partially hydrous RuO<SUB>2</SUB> nanocluster embedded in a carbon matrix (<I>0.27</I>-RuO<SUB>2</SUB>@C) as a 4-in-1 electrocatalyst. </LI> <LI> <I>0.27</I>-RuO<SUB>2</SUB>@C shows an excellent water-splitting performance at pH 0, pH 14 and even pH 7. </LI> <LI> Also, it drives Pt-level hydrogen oxidation as well as fairly good oxygen reduction. </LI> <LI> Moreover, the tetra-functionality of <I>0.27</I>-RuO<SUB>2</SUB>@C shows the possibility of realizing single-catalyst regenerative fuel cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Cho, Han‐,Saem,Seo, Sang Woo,Kim, Young Mi,Jung, Gyoo Yeol,Park, Jong Moon Wiley Subscription Services, Inc., A Wiley Company 2012 Biotechnology and bioengineering Vol.109 No.10
<P><B>Abstract</B></P><P>Glycolysis has evolved to be a highly robust mechanism for maintaining the cellular metabolism of living organisms. However, relevant modifications of glycolytic activity are required to intentionally modulate cellular phenotypes. Here, we designed a platform that allows switching control of glycolysis in <I>Escherichia coli</I> in response to an environmental signal, in this case, temperature. This system functions by regulating the expression of <I>gapA</I>, which encodes glyceraldehyde‐3‐phosphate dehydrogenase (GAPDH), one of the key glycolytic enzymes. Because a very low level of <I>gapA</I> expression is capable of maintaining cellular physiology, we also modified GAPDH through directed evolution to provide sensitive regulation of glycolytic activity. The switching control of glycolysis was successfully demonstrated by regulating the expression of engineered <I>gapA</I> through changes in temperature. This system offers potential control over the cell's central carbon‐metabolism switch, providing the ability to perform reprogrammed tasks with desired timing depending on environmental signals. Biotechnol. Bioeng. 2012; 109: 2612–2619. © 2012 Wiley Periodicals, Inc.</P>