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Jeonghyun Kim,Sang Chul Byun,Sungwook Chung,Seok Kim 한국탄소학회 2018 Carbon Letters Vol.25 No.-
Electrochemical properties and performance of composites performed by incorporating metal oxide or metal hydroxide on carbon materials based on graphene and carbon nanotube (CNT) were analyzed. From the surface analysis by field emission scanning electron microscopy and field emission transmission electron microscopy, it was confirmed that graphene, CNT and metal materials are well dispersed in the ternary composites. In addition, structural and elemental analyses of the composite were conducted. The electrochemical characteristics of the ternary composites were analyzed by cyclic voltammetry, galvanostatic charge-discharge tests, and electrochemical impedance spectroscopy in 6 M KOH, or 1 M Na2SO4 electrolyte solution. The highest specific capacitance was 1622 F g–1 obtained for NiCo-containing graphene with NiCo ratio of 2 to 1 (GNiCo 2:1) and the GNS/single-walled carbon nanotubes/Ni(OH)2 (20 wt%) composite had the maximum specific capacitance of 1149 F g–1. The specific capacitance and rate-capability of the CNT/MnO2/reduced graphene oxide (RGO) composites were improved as compared to the MnO2/RGO composites without CNTs. The MnO2/RGO composite containing 20 wt% CNT with reference to RGO exhibited the best specific capacitance of 208.9 F g–1 at a current density of 0.5 A g–1 and 77.2% capacitance retention at a current density of 10 A g–1.
Kim, Jeonghyun,Park, Soo-Jin,Kim, Seok The Korean Society of Industrial and Engineering C 2019 공업화학 Vol.30 No.3
Petal-like nickel cobaltite ($NiCo_2O_4$)/reduced graphene oxide (rGO) composites with different $rGO-to-NiCo_2O_4$ weight ratios were synthesized using a simple hydrothermal method and subsequent thermal treatment. In the $NiCo_2O_4/rGO$ composite, the $NiCo_2O_4$ 3-dimensional nanomaterials contributed to the improvement of electrochemical properties of the final composite material by preventing the restacking of the rGO sheet and securing ion movement passages. The composite structure was examined by field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and Fourier-transform infrared (FT-IR) spectroscopy. The FE-SEM and TEM images showed that petal-like $NiCo_2O_4$ was supported on the rGO surface. Cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) were used for the electrochemical analysis of composites. Among the prepared composites, $0.075g\;rGO/NiCo_2O_4$ composite showed the highest specific capacitance of $1,755Fg^{-1}$ at a current density of $2Ag^{-1}$. The cycle performance and rate capability of the composite material were higher than those of using the single $NiCo_2O_4$ material. These nano-structured composites could be regarded as valuable electrode materials for supercapacitors that require superior performance.
Kim, Hwajin,Kang, Heeyoung,Heo, Rok Won,Jeon, Byeong Tak,Yi, Chin-ok,Shin, Hyun Joo,Kim, Jeonghyun,Jeong, Seon-Yong,Kwak, Woori,Kim, Won-Ho,Kang, Sang Soo,Roh, Gu Seob SAGE Publications 2016 Journal of cerebral blood flow and metabolism Vol.36 No.6
<P> Diabetes-induced cognitive decline has been recognized in human patients of type 2 diabetes mellitus and mouse model of obesity, but the underlying mechanisms or therapeutic targets are not clearly identified. We investigated the effect of caloric restriction on diabetes-induced memory deficits and searched a molecular mechanism of caloric restriction-mediated neuroprotection. C57BL/6 mice were fed a high-fat diet for 40 weeks and RNA-seq analysis was performed in the hippocampus of high-fat diet-fed mice. To investigate caloric restriction effect on differential expression of genes, mice were fed high-fat diet for 20 weeks and continued on high-fat diet or subjected to caloric restriction (2 g/day) for 12 weeks. High-fat diet-fed mice exhibited insulin resistance, glial activation, blood-brain barrier leakage, and memory deficits, in that we identified neurogranin, a down-regulated gene in high-fat diet-fed mice using RNA-seq analysis; neurogranin regulates Ca<SUP>2+</SUP>/calmodulin-dependent synaptic function. Caloric restriction increased insulin sensitivity, reduced high-fat diet-induced blood-brain barrier leakage and glial activation, and improved memory deficit. Furthermore, caloric restriction reversed high-fat diet-induced expression of neurogranin and the activation of Ca<SUP>2+</SUP>/calmodulin-dependent protein kinase II and calpain as well as the downstream effectors. Our results suggest that neurogranin is an important factor of high-fat diet-induced memory deficits on which caloric restriction has a therapeutic effect by regulating neurogranin-associated calcium signaling. </P>
An Assessment Protocol on Accessibility of Smart-Home Environment for People with Disability
( Jeonghyun Kim ),( Jongbae Kim ),( Myoungjun Lim ),( Hyosoon Kwon ),( Heesuk Lee ),( Kyungsun Pyo ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
A Quality of Life Technology (QoLT) research team at NRRI design and build a QoLT testbed for assessing QoLT products, i.e., highly advanced assistive devices, and prescribing appropriate living environment for the individuals with disability. The QoLT testbed is possible by Focus Group`s participation in user needs analysis, design, and building of the testbed. To design effective and efficient method of prescription and delivery of appropriate independent living environment for the individuals with disability, the QoLT team at NRRI designs a tentative assessment protocol focused on performance and satisfaction, parts of accessibility and usability, and evaluate the tentative protocol for seven months. The tentative assessment protocol for accessibility and usability of assistive devices in testbed environment for independent living of individuals with disability including Spinal Cord Injury (SCI) is designed and verified with outcomes of 15 cases. The tentative assessment protocol is designed by referring Canadian Occupational Performance Measurement (COPM) with ten scale-based scoring and performed by an Occupational Therapist. The 15 subjects are 10 individuals with SCI - seven cervical spinal cord injury, two thoracic spinal cord injury, one lumbar spinal cord injury - and five individuals with stroke - three individuals with left hemiplegia and two individuals with right hemiplegia. 15 subjects are taken surveys before and after living in the testbed from one week up to four weeks, which is a part of the tentative assessment protocol.
MIRIS Pa <i>α</i> Galactic Plane Survey. I. Comparison with IPHAS H <i>α</i> in <i>ℓ</i> = 96°-116°
Kim, Il-Joong,Pyo, Jeonghyun,Jeong, Woong-Seob,Seon, Kwang-Il,Nakagawa, Takao,Kim, Min Gyu,Park, Won-Kee,Lee, Dae-Hee,Lee, Dukhang,Moon, Bongkon,Park, Sung-Joon,Park, Youngsik,Matsumoto, Toshio,Han, W American Astronomical Society 2018 The Astrophysical journal Supplement series Vol.238 No.2
<P>The Multipurpose InfraRed Imaging System (MIRIS) performed the MIRIS Pact Galactic Plane Survey (MIPAPS), which covers the entire Galactic plane within the latitude range of -3 degrees less than or similar to b less than or similar to +3 degrees at Pa alpha (1.87 mu m). We present the first result of the MIPAPS data extracted from the longitude range of l = 96 degrees.5-116.degrees 3 and demonstrate the quality and scientific potential of the data by comparing them with Ha maps obtained from the INT Photometric H alpha Survey (IPHAS) data. We newly identify 90 H II region candidates in the WISE H II region catalog as definite H II regions by detecting the Pa alpha and/or H alpha recombination lines, out of which 53 H II regions are detected at Pa alpha. We also report the detection of an additional 29 extended and 18 point-like sources at Pa alpha. We estimate the E(B-V) color excesses and total Lyman continuum luminosities for H II regions by combining the MIPAPS Pact and IPHAS H alpha fluxes. The E(B-V) values are found to be systematically lower than those estimated from point stars associated with H II regions. Utilizing the MIPAPS Pact and IPHAS H alpha images, we obtain an E(B-V) map for the entire region of the H II region Sh2-131 with an angular size of -2 degrees.5. The E(B-V) map shows not only numerous high-extinction filamentary features but also negative E(B-V) regions, indicating H alpha excess. The Ha excess and systematic underestimation of E(B-V) are attributed to light scattered by dust.</P>
Kim, Miyoung,Kim, Hanna,Ryu, Jeonghyun,Jo, Suzy,Lee, Guemsan,Ryu, Mi Heon,Kim, Hyungwoo,Cho, Su In Medknow PublicationsMedia Pvt Ltd 2014 Pharmacognosy magazine Vol.10 No.38
<P><B>Background:</B></P><P>The slough shed of <I>Cryptotympana atrata</I> Fabricius is widely used to treat skin diseases in China, Japan, and Korea.</P><P><B>Objective:</B></P><P>To investigate the anti-inflammatory effects of <I>C. atrata</I> on contact dermatitis.</P><P><B>Materials and Methods:</B></P><P>We investigated the effects of <I>C. atrata</I> methanol extract (MECA) on ear swelling, histophathological changes and cytokine production in 1-fluoro-2,4-dinitrofluorobenzene (DNFB)-induced contact dermatitis (CD) mice.</P><P><B>Results:</B></P><P>Topical application of MECA effectively inhibited enlargement of ear swelling (30 and 100 μ/ear, <I>P</I> < 0.05; 300 μg/ear, <I>P</I> < 0.01). MECA treatment also inhibited hyperplasia, spongiosis (100 and 300 μg/ear, <I>P</I> < 0.001), and immune cell infiltration (30 μg/ear, <I>P</I> < 0.05; 100 and 300 μg/ear, <I>P</I> < 0.001) induced by DNFB. In addition, treatment with MECA suppressed the increase in the levels of TNF-α (<I>P</I> < 0.05), IFN-g (3, 100 μg/ear, <I>P</I> < 0.05; 300 μg/ear, <I>P</I> < 0.01), and IL-6 (100 μg/ear, <I>P</I> < 0.05; 300 μg/ear, <I>P</I> < 0.01) production.</P><P><B>Conclusion:</B></P><P>These data suggest that MECA has the potential for use in the treatment of inflammatory skin diseases, including CD. Moreover, the results presented herein indicate that anti-inflammatory actions of MECA are mediated by decreasing production of TNF-α, IFN-γ, and IL-6 in inflamed tissues.</P>