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Lee, Seungwon,Kim, Hyekang,You, Gihoon,Kim, Young-Min,Lee, Seunghun,Le, Viet-Hoan,Kwon, Ohseop,Im, Sin-Hyeog,Kim, You-Me,Kim, Kwang Soon,Sung, Young Chul,Kim, Ki Hean,Surh, Charles D.,Park, Yunji,Lee, American Society of Hematology 2019 Blood Vol.134 No.16
<B>Abstract</B><P>Lee and colleagues investigated the role of the intestinal microbiota in steady-state hematopoieisis, demonstrating that microbiota-derived DNA circulates to the bone marrow, where uptake by mononuclear cells leads to inflammatory cytokine production favoring myeloid-cell maturation of hematopoietic progenitors.</P>
Lee, Byung Yang,Seo, Sung Min,Lee, Dong Joon,Lee, Minbaek,Lee, Joohyung,Cheon, Jun-Ho,Cho, Eunju,Lee, Hyunjoong,Chung, In-Young,Park, Young June,Kim, Suhwan,Hong, Seunghun Royal Society of Chemistry 2010 Lab on a chip Vol.10 No.7
<P>We developed a carbon nanotube (CNT)-based biosensor <I>system</I>-<I>on</I>-<I>a</I>-<I>chip</I> (SoC) for the detection of a neurotransmitter. Here, 64 CNT-based sensors were integrated with silicon-based signal processing circuits in a single chip, which was made possible by combining several technological breakthroughs such as <I>efficient signal processing</I>, <I>uniform CNT networks</I>, and <I>biocompatible functionalization of CNT</I>-<I>based sensors</I>. The chip was utilized to detect glutamate, a neurotransmitter, where ammonia, a byproduct of the enzymatic reaction of glutamate and glutamate oxidase on CNT-based sensors, modulated the conductance signals to the CNT-based sensors. This is a major technological advancement in the integration of CNT-based sensors with microelectronics, and this chip can be readily integrated with larger scale lab-on-a-chip (LoC) systems for various applications such as LoC systems for neural networks.</P> <P>Graphic Abstract</P><P>Uniform arrays of carbon nanotube (CNT)-based biosensors were integrated with CMOS signal-processing circuits into a CNT-biosensor system-on-a-chip (SoC) for the detection of glutamate, a neurotransmitter. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b916975j'> </P>
Lee, Minbaek,Lee, Joohyung,Kim, Tae Hyun,Lee, Hyungwoo,Lee, Byung Yang,Park, June,Jhon, Young Min,Seong, Maeng-Je,Hong, Seunghun IOP Pub 2010 Nanotechnology Vol.21 No.5
<P>Nanoscale sensors based on single-walled carbon nanotube (SWNT) networks have been considered impractical due to several fundamental limitations such as a poor sensitivity and small signal-to-noise ratio. Herein, we present a strategy to overcome these fundamental problems and build highly-sensitive low-noise nanoscale sensors simply by controlling the structure of the SWNT networks. In this strategy, we prepared nanoscale width channels based on aligned SWNT networks using a directed assembly strategy. Significantly, the aligned network-based sensors with narrower channels exhibited even better signal-to-noise ratio than those with wider channels, which is opposite to conventional random network-based sensors. As a proof of concept, we demonstrated 100 nm scale low-noise sensors to detect mercury ions with the detection limit of ∼1 pM, which is superior to any state-of-the-art portable detection system and is below the allowable limit of mercury ions in drinking water set by most government environmental protection agencies. This is the first demonstration of 100 nm scale low-noise sensors based on SWNT networks. Considering the increased interests in high-density sensor arrays for healthcare and environmental protection, our strategy should have a significant impact on various industrial applications. </P>
Lee, Seunghun,Ji, Kwang-sun,Park, Hyomin,Tark, Sung Ju,Park, Sungeun,Lee, Jeong Chul,Kim, Won Mok,Kang, Yoonmook,Lee, Hae-Seok,Kim, Donghwan Elsevier 2015 THIN SOLID FILMS - Vol.589 No.-
<P><B>Abstract</B></P> <P>We investigated the structural, optical, and electrical properties of Zn–In–Sn–O (ZITO) films prepared by RF magnetron sputtering for silicon heterojunction solar cells. The effects of Zn addition on the properties of the as-grown films were examined. XRD patterns of the ZITO films deposited at room temperature showed a broad peak. The cross-sectional TEM image of ZITO films at low Zn levels exhibited a typical fine or nanostructure embedded in an amorphous phase. On the other hand, at higher Zn addition, the films exhibited a completely amorphous phase. The carrier concentration decreased with increasing Zn content. The lowest electrical resistivity of 5.5×10<SUP>-4</SUP> Ωcm was observed for a ZITO film with 4.83 Znat.%. All ZITO films grown in this study showed transmittance of over 80% in the visible and near-infrared spectral range. The absorption was less than 5% in the visible region.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Zn–In–Sn–O(ZITO) films with various Zn and Sn contents prepared by RF magnetron sputtering </LI> <LI> Some ZITO films exhibited nanocrystalline structures embedded in an amorphous phase. </LI> <LI> The electrical and optical properties improved with increasing Zn content. </LI> </UL> </P>
Seunghun Kim,Kyuseon Lee,Yongtaeg Lee 대한건축학회 2017 Architectural research Vol.19 No.4
This study is done to evaluate how existence of shear-span ratio and shear reinforcing bar effects on shear performance from through shear experiment using PVA fiber reinforced ferroconcrete building. Ratio of shear-span was set 1, 1.7, and arrangement of shear reinforcing bar was set with KCI2012 regulation. In result, subject with less shear-span ratio, and shear reinforcing bar with arrangement of bar shows high stiffness. Subjects with high shear-span ratio show large difference depending on existence of shear reinforcing bar. Therefore, theoretical shear strength followed by CEB code underestimates experimental shear strength by 43.9%. Shear strength of the deep beam with headed bars is more affected by the bearing strength of head than the bond strength of bar.
Lee, Jeong Hyuk,Lee, Woong-Jhae,Kim, Tai Hoon,Lee, Takhee,Hong, Seunghun,Kim, Kee Hoon IOP 2017 Journal of physics, an Institute of Physics journa Vol.29 No.38
<P>Transparent <I>p</I>-CuI/<I>n</I>-BaSnO<SUB>3−<I>δ</I> </SUB> heterojunction diodes were successfully fabricated by the thermal evaporation of a (1 1 1) oriented <I>γ</I>-phase CuI film on top of an epitaxial BaSnO<SUB>3–<I>δ</I> </SUB>(0 0 1) film grown by the pulsed laser deposition. Upon the thickness of the CuI film being increased from 30 to 400 nm, the hole carrier density was systematically reduced from 6.0 × 10<SUP>19</SUP> to 1.0 × 10<SUP>19</SUP> cm<SUP>−3</SUP> and the corresponding rectification ratio of the <I>pn</I> diode was proportionally enhanced from ~10 to ~10<SUP>6</SUP>. An energy band diagram exhibiting the type-II band alignment is proposed to describe the behavior of the heterojunction diode. A shift of a built-in potential caused by the hole carrier density change in the CuI film is attributed to the thickness-dependent rectification ratio. The best performing <I>p</I>-CuI/<I>n</I>-BaSnO<SUB>3−<I>δ</I> </SUB> diode exhibited a high current rectification ratio of 6.75 × 10<SUP>5</SUP> at ±2 V and an ideality factor of ~1.5.</P>