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Journal of Environmental Sciences 2020年第6期32卷 11-17页

作者： Jung joon Lee Jihyeon park Bo-Hyun Kim Sunjong Lee Department of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwon 16419South Korea Korea Institute of Industrial Technology 89 Yangdaegiro-gilIpjang-myeonCheonan-si 31056South Korea

Regeneration of pure water is an important issue not only for the healthy life but also for the fine control of precise processes in various *** important issue in ultrahigh purified water is to reduce the amount of total organic carbon(TOC).Herein,we introduce a new approach to reduce the TOC using the surface silanized nanoparticles,in which the magnetic nanoparticles(mNPs)are silanized and then complexed with ion exchange resin(IER)*** Fe3O4 mNPs are surface modified by using high concentrated vinyltrimethoxysilane(VTMS)and then adhered on the surface of IER *** surface modified mNPs have a thick-shell of polysiloxane layer varying from 5 to 22 nm depending on the amount of VTMS used,which leads the significant increase of specific surface *** IER beads embedding VTMS-silanized mNPs achieves about 7μg/L of the TOC level in ultrapure water system,which is two orders less than 228μg/L of the feeding water and one order less than 96μg/L from the system using pristine IER *** result is mainly attributed to the polysiloxane layer forming broccoli-like surface structure and some part by the vinyl group of VTMS exposed to the amines in the water.

关键词： Total organic carbon Ultrapure water Magnetic nanoparticle Ion-exchange resin Hybrid structure

Diagnosing isolated superior mesenteric artery dissection and thrombosis using point-of-care ultrasonography:A case series

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World Journal of Emergency Medicine 2022年第3期13卷 239-241页

作者： Sin Youl park Won joon Jeong Department of Emergency Medicine Yeungnam University Medical CenterDaegu 42415Republic of Korea Department of Emergency Medicine Chungnam National University HospitalDaejeon 301721Republic of Korea

Dear editor,Most superior mesenteric artery (SMA) dissections occuralongwithaorticdissections;isolatedSMA dissectionsarerare(incidencerateof0.06%).[1] A diagnosis of SMA dissection is generally made using contrast-enhancedcomputedtomography(CECT);however, bedside point-of-care ultrasound (POCUS)may hasten the process. Herein, we present a case series of isolated SMA dissections that were suspected and confirmed using POCUS and CECT, respectively.

关键词： point process editor

Regulation of c-SMAC formation and AKT-mTOR signaling by the TSG101-IFT20 axis in CD4^(+)T cells

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Cellular & Molecular Immunology 2023年第5期20卷 525-539页

作者： Jiung Jeong In Kang Yumin Kim Keun Bon Ku Jang Hyun park Hyun-Jin Kim Chae Won Kim Jeongwoo La hi Eun Jung Hyeon Cheol Kim Young joon Choi Jaeho Kim joon Kim Heung Kyu Lee Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Internal Medicine Seoul National University HospitalSeoul 03080Republic of Korea Department of Biological Sciences KAISTDaejeon 34141Republic of Korea Department of Convergent Research of Emerging Virus Infection Korea Research Institute of Chemical TechnologyDaejeon 34114Republic of Korea.

CD4^(+)T cells play major roles in the adaptive immune system,which requires antigen recognition,costimulation,and cytokines for its elaborate *** studies have provided new insight into the importance of the supramolecular activation cluster(SMAC),which comprises concentric circles and is involved in the amplification of CD4^(+)T cell ***,the underlying mechanism of SMAC formation remains poorly ***,we performed single-cell RNA sequencing of CD4^(+)T cells left unstimulated and stimulated with anti-CD3 and anti-CD28 antibodies to identify novel proteins involved in their *** found that intraflagellar transport 20(IFT20),previously known as cilia-forming protein,was upregulated in antibody-stimulated CD4^(+)T cells compared to unstimulated CD4^(+)T *** also found that IFT20 interacted with tumor susceptibility gene 101(TSG101),a protein that endocytoses ubiquitinated T-cell *** interaction between IFT20 and TSG101 promoted SMAC formation,which led to amplification of AKT-mTOR ***,IFT20-deficient CD4^(+)T cells showed SMAC malformation,resulting in reduced CD4^(+)T cell proliferation,aerobic glycolysis,and cellular ***,mice with T-cell-specific IFT20 deficiency exhibited reduced allergen-induced airway ***,our data suggest that the IFT20-TSG101 axis regulates AKT-mTOR signaling via SMAC formation.

关键词： CD4^(+)T cell Intraflagellar transport 20 Tumor susceptibility gene 101 AKT-mTOR signaling Asthma Supramolecular activation cluster

Comprehensive analysis of two-dimensional charge transport mechanism in thin-film transistors based on random networks of single-wall carbon nanotubes using transient measurements

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Nano Research 2022年第2期15卷 1524-1531页

作者： Hyeonwoo Shin Sang-joon park Byeong-Cheol Kang Tae-Jun Ha Department of Electrical Engineering and Computer Science Inter-university Semiconductor Research CenterSeoul National UniversitySeoul 08826Korea Department of Electronic Materials Engineering Kwangwoon UniversitySeoul 01897Korea

Understanding charge transport mechanisms in thin-film transistors based on random networks of single-wall carbon nanotubes(SWCNT-TFTs)is essential for further advances to improve the potential for various nanoelectronic ***,a comprehensive investigation of the two-dimensional(2D)charge transport mechanism in SWCNT-TFTs is reported by analyzing the temperature-dependent electrical characteristics determined from the direct-current and non-quasi-static transient measurements at 80-300 *** elucidate the time-domain charge transport characteristics of the random networks in the SWCNTs,an empirical equation was derived from a theoretical trapping model,and a carrier velocity distribution was determined from the differentiation of the transient ***,charge trapping and de-trapping in shallow-and deep-traps in SWCNT-TFTs were analyzed by investigating charge transport based on their trapping/de-trapping *** comprehensive analysis of this study provides fundamental insights into the 2D charge transport mechanism in TFTs based on random networks of nanomaterial channels.

关键词： single-wall carbon nanotube random networks two-dimensional(2D)charge transport time-domain transient measurements charge trapping/de-trapping shallow-/deep-traps

Parallel Iterative FEM Solver with Initial Guess for Frequency Domain Electromagnetic Analysis

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Intelligent Automation & Soft Computing 2023年第5期36卷 1585-1602页

作者： Woochan Lee Woobin park Jaeyoung park Young-joon Kim Moonseong Kim Department of Electrical Engineering Incheon National UniversityIncheon22012Korea Department of Computer Engineering Hongik UniversitySeoul04066Korea Department of Electronic Engineering Gachon UniversitySeongnam13120Korea Department of IT Convergence Software Seoul Theological UniversityBucheon14754Korea

The finite element method is a key player in computational electromag-netics for designing RF(Radio Frequency)components such as *** frequency-domain analysis is fundamental to identify the characteristics of the *** the conventional frequency-domain electromagnetic analysis using FEM(Finite Element Method),the system matrix is complex-numbered as well as indeﬁ*** iterative solvers can be faster than the direct solver when the solver convergence is guaranteed and done in a few ***,such complex-numbered and indeﬁnite systems are hard to exploit the merit of the iterative *** is also hard to beneﬁt from matrix factorization techniques due to varying system matrix parts according to ***,it is hard to adopt conventional iterative solvers even though the system matrix is sparse.A new parallel iterative FEM solver for frequency domain analysis is implemented for inhomogeneous waveguide structures in this *** this implementation,the previous solution of the iterative solver of Matlab(Matrix Laboratory)employ-ing the preconditioner is used for the initial guess for the next step’s solution *** overlapped parallel stage using Matlab’s Parallel Computing Toolbox is also proposed to alleviate the cold starting,which ruins the convergence of early steps in each parallel *** experiments based on waveguide structures have demonstrated the accuracy and efﬁciency of the proposed scheme.

关键词： Computational electromagnetics numerical simulation ﬁnite element method parallel processing iterative solvers

Statistics of oxidation resistance of Ni-(0-15)Co-(8-15)Cr-(0-5)Mo-(0-10)W-(3-8)Al-(0-5)Ti-(0-10)Ta-0.1C-0.01B superalloys at 1000℃ by compositional variations

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Rare Metals 2020年第8期39卷 918-927页

作者： Si-Jun park Kyu-Hyuk Lee Seong-Moon Seo hi-Won Jeong Young-Soo Yoo HeeJin Jang Multi-Material Research Center Gwangju-Jeonnam DivisionKorea Automotive Technology InstituteGwangju 62207Republic of Korea Department of Advanced Materials Engineering Chosun UniversityGwangju 61452Republic of Korea high Temperature Materials Group Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Engineering Chosun UniversityGwangju 61452Republic of Korea

The effects of alloying elements(Co,Cr,Mo,W,Al,Ti,and Ta)on the oxidation resistance of Ni-(0-15)Co-(8-15)Cr-(0-5)Mo-(0-10)W-(3-8)Al-(0-5)Ti-(0-10)Ta-0.1 C-0.01 B alloys were *** sample compositions were designed by the Box-Behnken method of design of experiments(DOE).The alloying elements show complicated effects on the mass gain due to oxidation,depending on the alloy *** reduces the mass gain *** other elements except Al do not appear to exert a strong effect on the oxidation rate on average,but their influences are shown clearly in the alloys with a low Al ***,W,and Ta reduce the oxidation rate,while Cr,Mo,and Ti promote *** is the most effective element in reducing the oxidation rate of the alloy with a low Al *** is confirmed that a continuous Al2O3 layer is essentially required for high oxidation *** oxide scale of easily oxidized alloys has various oxides such as NiCr2O4,NiAl2O4,NiO,Cr2O3,CrTaO4,and TiO2.

关键词： high temperature oxidation Alloy composition Ni-based superalloy Oxidation resistance Design of experiments

Precise control of surface oxygen vacancies in ZnO nanoparticles for extremely high acetone sensing response

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Journal of Advanced Ceramics 2022年第5期11卷 769-783页

作者： Jihyun LEE Youngmoon CHOI Byoung joon park Jeong Woo HAN Hyun-Sook LEE Jong Hyeok park Wooyoung LEE Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical and Biological Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea

ZnO has been studied intensely for chemical sensors due to its high sensitivity and fast ***,we present a simple approach to precisely control oxygen vacancy contents to provide significantly enhanced acetone sensing performance of commercial ZnO nanopowders.A combination of H_(2)O_(2)treatment and thermal annealing produces optimal surface defects with oxygen vacancies on the ZnO nanoparticles(NPs).The highest response of~27,562 was achieved for 10 ppm acetone in 0.125 MH_(2)O_(2)treated/annealed ZnO NPs at the optimal working temperature of 400℃,which is significantly higher than that of reported so far in various acetone sensors based on metal oxide semiconductors(MOSs).Furthermore,first-principles calculations indicate that pre-adsorbed O formed on the surface of H_(2)O_(2)treated ZnO NPs can provide favorable adsorption energy,especially for acetone detection,due to strong bidentate bonding between carbonyl C atom of acetone molecules and pre-adsorbed O on the ZnO *** study demonstrates that controlling surface oxygen vacancies by H_(2)O_(2)treatment and re-annealing at optimal temperature is an effective method to improve the sensing properties of commercial MOS materials.

关键词： gas sensors acetone metal oxide semiconductors(MOSs) ZnO nanoparticles(NPs) H_(2)O_(2)treatment

Calcium-dependent proteasome activation is required for axonal neurofilament degradation

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Neural Regeneration Research 2013年第36期8卷 3401-3409页

作者： Joo Youn park So Young Jang Yoon Kyung Shin Duk joon Suh Hwan Tae park Department of Physiology Mitochondria Hub Regulation Center College of Medicine Dong-A University

Even though many studies have identified roles of proteasomes in axonal degeneration, the mo- lecular mechanisms by which axonal injury regulates proteasome activity are still unclear. In the present study, we found evidence indicating that extracellular calcium influx is an upstream regulator of proteasome activity during axonal degeneration in injured peripheral nerves. In degenerating axons, the increase in proteasome activity and the degradation of ubiquitinated proteins were sig- nificantly suppressed by extracellular calcium chelation. In addition, electron microscopic findings revealed selective inhibition of neurofilament degradation, but not microtubule depolymerization or mitochondrial swelling, by the inhibition of calpain and proteasomes. Taken together, our findings suggest that calcium increase and subsequent proteasome activation are an essential initiator of neurofilament degradation in Wallerian degeneration.

关键词： neural regeneration peripheral nerve injury neurofilament degradation sciatic nerve calcium calpain mitochondria microtubule depolymerization axon axon degeneration neuroregeneration

Unilateral foveomacular retinitis resembling solar retinopathy among young soldiers in Korean army and associated multimodal imaging findings

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International Journal of Ophthalmology(English edition) 2020年第1期13卷 112-119页

作者： Chang Ki Yoon Kyu Hyung park Se joon Woo Department of Ophthalmology Seoul National University College of MedicineSeoul National University Bundang HospitalSeongnam 13620Korea Department of Ophthalmology Hallym University College of MedicineHallym University Kangnam Sacred Heart HospitalSeoul 07441Korea

AIM: To describe the clinical features and multimodal images of unilateral foveomacular retinitis in young Korean soldiers. METHODS: Ten patients having foveomacular retinitis were included. Fluorescein angiography, fundus autofluorescence(FAF), infrared reflectance(IR), and spectral-domain optical coherence tomography(SD-OCT) were ***: All patients were young males experienced insidious visual decline without exposure to bright light. Initial and final vision ranged from hand movement to 20/20(median 20/200) and 20/2000 to 20/20(median 20/500), respectively. Vision decreased in 6 patients while improved in two. Typical macular abnormality was yellow granular spots. SD-OCT showed ellipsoid zone(EZ) or interdigitation zone(IZ) disruption of fovea. The degree of EZ/IZ damage correlated with vision. Lesions were clearly visualized through IR and matched with SD-OCT ***: This is the first case series of foveomacular retinitis diagnosed with multimodal imaging. Foveomacular retinitis should be suspected in sudden unilateral visual decline especially in young soldiers. SD-OCT is the most important diagnostic modality.

关键词： foveomacular retinitis Korean multimodal imaging solar retinopathy soldiers unilateral

Electrophoretic Deposition of Oxide Nanoparticles for Electron Emission Enhancement

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Journal of Materials Science & Technology 2010年第11期26卷 1032-1036页

作者： Jong Rok Ahn Gil Seon Kang Hwack Joo Lee Chang joon park Korea Research Institute of standards and Science

Four oxide nanoparticles,such as yttrium oxide,lanthanum oxide,cerium oxide and zirconium oxide were coated on rhenium filaments by an electrophoretic deposition *** oxide coatings were examined by scanning electron microscopy,and electron emission characteristics of the oxide-coated rhenium were studied to find alternative oxide materials for replacing the hazardous thorium *** four oxides tested in this work,yttrium oxide and lanthanum oxide coated rhenium showed enhanced electron emission compared with an uncoated ***,lanthanum oxide coating evaporated too quickly in a vacuum chamber,and hence yttrium oxide was found to be the only alternative material for use in a routine mass *** optimum coating thickness of the yttrium oxide and lanthanum oxide was around 20 μm.

关键词： Electrophoretic deposition Oxide nanoparticles Scanning electron microscopy (SEM) Electron emission