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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 947-962页

作者： N.IQBAL j.choi S.F.SHAH C.LEE S.LEE Department of Mechanical Roboticsand Energy EngineeringDongguk University-SeoulSeoul 04620Republic of Korea

A chemo-mechanical model is developed to investigate the effects on the stress development of the coating of polycrystalline Ni-rich LiNixMnyCo_(z)O_(2)(x≥0.8)(NMC)particles with poly(3,4-ethylenedioxythiophene)(PEDOT).The simulation results show that the coating of primary NMC particles significantly reduces the stress generation by efficiently accommodating the volume change associated with the lithium diffusion,and the coating layer plays roles both as a cushion against the volume change and a channel for the lithium transport,promoting the lithium distribution across the secondary particles more ***,the lower stiffness,higher ionic conductivity,and larger thickness of the coating layer improve the stress *** paper provides a mathematical framework for calculating the chemo-mechanical responses of anisotropic electrode materials and fundamental insights into how the coating of NMC active particles mitigates stress levels.

关键词： lithium-ion battery(LIB) polycrystalline particle coating finite element simulation Ni-rich LiNixMnyCo_(z)O_(2)(x>0.8)(NMC)

Synthesis and Magnetic Properties of Nanoparticles of Fe-Co Alloys and Their Oxides Prepared by Chemical Vapor Condensation

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journal of Materials Science & Technology 2004年第4期20卷 459-462页

作者： ZhenhuaWANG ZhidongZHANG C.j.choi B.K.Kim j.C.Kim ShenyangNationalLaboratoryforMaterialsScienceandInternationalCentreforMateri~alsPhysics InstituteofMetalResearchChineseAcademyofSciencesShenyang110016China KoreaInstituteofMachineryandMaterials 66Sangnam-DongChangwonKyungnam641-010Korea

Nanoparticles of Fe-Co alloys and their oxides with the particle size below 20 nm were prepared by chemical vapor condensation process. The pure Ar, Ar+1%O2, Ar+3%O2 and Ar+6%O2 were used as carrier gases, with iron carbonyl and cobalt carbonyl as the precursors. XRD patterns showed that Fe-Co metallic nanoparticles were synthesized by using pure Ar as carrier gas, and only metal oxides were obtained using Ar+(>3)%O2 as carrier gas. The HRTEM images and TG-DTA curves were used to study the core-shell structure of the different nanoparticles. The nanoparticles obtained in pure Ar consist of black core and light shell with thickness of 2~4 nm. However, in the particles obtained in Ar+6%02, the oxides core with visible lattice fringes are surrounded by thin shell.

关键词： Fe-Co Nanoparticles HRTEM CVC

Magnetic Properties and Coercivity of MnGa Films Deposited on Different Substrates

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journal of Materials Science & Technology 2017年第3期33卷 291-294页

作者： j.N.Feng W.Liu W.j.Gong X.G.Zhao D.Kim C.j.choi Z.D.Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Powder and Ceramics Division Korea Institute of Materials Science

MnGa films were grown by magnetron sputtering on thermally oxidized Si（Si/SiO2） and glass substrates. Films grown on single-crystal Si（100） substrate with different underlayers were prepared for comparison. It is found that the Si/SiO2 substrate is more suitable for growing high-coercivity MnGa films than the glass substrate, which is the result of the isolated-island-like growth. A coercivity of 9.7 kOe can be achieved for the 10 nm MnGa films grown on Si/SiO2 substrate at substrate temperature TS of 450 °*** experimental conditions are specified by changing the thickness of the MnGa films and the temperature of the substrates.

关键词： Atomic force microscopy Coercivity Magnetic properties Magnetron sputtering Thin film

基于肿瘤生长速率的LI-RADS生长阈值可提高≤3.0 cm肝细胞癌的诊断效能

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国际医学放射学杂志 2024年第2期 255-255页

作者： B.jeong S.j.choi S.H.choi H.j.jang j.H.Byun H.j.Won 侯唯姝

摘要目的尽管2018版肝脏成像报告和数据系统（LIRADS）对肝脏病变的生长阈值（TG）进行了修订，但确定TG的2次检查之间的适当时间段尚未确定。该研究比较了基于

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De novo and recurrence of metabolic dysfunction-associated fatty liver disease after liver transplantation

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World journal of Hepatology 2021年第12期13卷 1991-2004页

作者： Ma Ai Thanda Han Raquel Olivo Catherine j choi Nikolaos Pyrsopoulos Department of Gastroenterology and Hepatology Rutgers New Jersey Medical SchoolNewarkNJ 07103United States Department of Gastroenterology and Hepatology Rutgers UniversityNew Jersey Medical SchoolNewarkNJ 07103United States Department of Medicine Rutgers New Jersey Medical SchoolNewarkNJ 07101United States

Metabolic dysfunction-associated fatty liver disease(MAFLD)is a new acronym adopted from the consensus of international *** the increasing prevalence of MAFLD in pre-transplant settings,de novo and recurrent graft steatosis/MAFLD are common in post-transplant *** impact of graft steatosis on long-term outcomes is *** current knowledge of incidence rate,risk factors,diagnosis,long-term outcomes,and management of graft steatosis(both de novo and recurrent)is discussed in this review.

关键词： Metabolic dysfunction-associated fatty liver disease Metabolic dysfunctionassociated steatohepatitis De novo Recurrent Graft steatosis Fibrosis Survival

Extracellular vesicles and angiotensin-converting enzyme 2 in COVID-19 disease

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BIOCELL 2024年第1期48卷 1-8页

作者： YU LIU ROBERT j.KASPER NATALIE j.S.choi Department of Family and Community Medicine Northwestern University Feinberg School of MedicineChicagoIllinois

Extracellular vesicles(EVs)are membranous vesicular structures released from almost all eukaryotic cell types under different physiological or pathological *** evidence demonstrates that EVs can serve as mediators of intercellular communication between donor and recipient cells or microorganism-infected and noninfected *** disease 2019(COVID-19)disease is caused by infection of the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)of host cells in the respiratory system and various extra-pulmonary tissue/organs,resulting in complications of multiple organ *** the cell surface receptor,angiotensin-converting enzyme 2(ACE2)mediates cellular entry of SARS-CoV-2 into the host cells in patients with *** studies have found that ACE2 can be released with EVs,which have been shown to interfere with the entry of the virus into host cells and thus may be involved in COVID-19 *** addition,ACE2,neprilysin(NEP),and thimet oligopeptidase(TOP)are the key enzymes that regulate angiotensin metabolism by converting angiotensin II or angiotensin I to angiotensin 1-7,the latter of which has protective effects in counterbalancing the harmful effects of angiotensin II in COVID-19 *** review summarizes the recent research progress regarding EV-associated ACE2,NEP,and TOP and the perspectives of their potential involvement in the pathophysiology of COVID-19 disease.

关键词： Extracellular vesicles COVID-19 Angiotensin converting enzyme 2 Thimet oligopeptidase

Fabrication of ultrafine Nd-Fe-B powder by a modified reduction-diffusion process

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Rare Metals 2006年第Z2期25卷 223-226页

作者： jANG T.S. LEE D.H. choi C.j. SEO W.S. LEE Y.H. Department of Electronic Materials Engineering Sunmoon University Korea Powder Materials Research Center Korea Institute of Machinery and Materials Korea Advanced Materials Analysis & Evaluation Center Korea Institute of Ceramic Engineering and Technology Korea

In order to obtain ultrafine Nd-Fe-B powder, a spray-dried precursor was treated by reduction-diffusion (R/D) process. And, unlike the conventional R/D process, calcium reduction that is a crucial step for the formation of Nd2Fe14B was performed without conglomerating the precursor with Ca powder. By adopting this modified process, it is possible to synthesize the hard magnetic Nd2Fe14B at the reaction temperature as low as 850 ℃. The average size of Nd2Fe14B particles that are uniformly distributed in the optimally treated powder was <<1 μm. Most Nd2Fe14B particles were enclosed with thin layers of Nd-rich phase. Typical magnetic properties of such powder without eliminating impurity CaO were iHc=～5.9 kOe, Br=～5.5 kG, and (BH)max=～6 MGOe.

关键词： NdFeB powder spray drying reduction-diffusion process Nd2Fe14B magnetic powder

Cannabis use history is associated with increased prevalence of ascites among patients with nonalcoholic fatty liver disease:A nationwide analysis

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World journal of Hepatology 2020年第11期12卷 993-1003页

作者： Catherine j choi Stanley H Weiss Umair M Nasir Nikolaos T Pyrsopoulos Department of Medicine Rutgers New Jersey Medical SchoolNewarkNJ 07101United States Department of Medicine Biostatistics and EpidemiologyRutgers New Jersey Medical SchoolNewarkNJ 07103United States Division of Gastroenterology and Hepatology Department of MedicineRutgers-New Jersey Medical SchoolNewarkNJ 07103United States

BACKGROUND Recent studies have revealed the endocannabinoid system as a potential therapeutic target in the management of nonalcoholic fatty liver disease(NAFLD).Cannabis use is associated with reduced risk for NAFLD,we hypothesized that cannabis use would be associated with less liver-related clinical complications in patients with *** To assess the effects of cannabis use on liver-related clinical outcomes in hospitalized patients with *** We performed a retrospective matched cohort study based on querying the 2014 National Inpatient Sample(NIS)for hospitalizations of adults with a diagnosis of *** NIS database is publicly available and the largest all-payer inpatient database in the United *** patients with cannabis use were selected as cases and those without cannabis were selected as ***-control matching at a ratio of one case to two controls was performed based on sex,age,race,and *** liver-related outcomes such as portal hypertension,ascites,varices and variceal bleeding,and cirrhosis were compared between the *** A total of 49911 weighed hospitalizations with a diagnosis of NAFLD were *** these,3820 cases were selected as the cannabis group,and 7625 noncannabis cases were matched as *** with cannabis use had a higher prevalence of ascites(4.5%vs 3.6%),with and without cannabis use,P=*** prevalence of portal hypertension(2.1%vs 2.2%),varices and variceal bleeding(1.3%vs 1.7%),and cirrhosis(3.7%vs 3.6%)was not different between the groups,with and without cannabis use,all P>***,race/ethnicity other than White,Black,Asian,Pacific Islander or Native American,and higher comorbidity score were independent risk factors for ascites in the cannabis *** non-cannabis users,obesity and hyperlipidemia were independent protective factors against ascites while older age,Native American and higher comorbidity index were independent risk factors for ***

关键词： Nonalcoholic fatty liver disease Fatty liver Cannabis Marijuana use Liver diseases Hospitalization

In Situ Experiments for the Validation of Disposal System at KAERI Underground Research Tunnel

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In Situ Experiments for the Validation of Disposal System at...

Recent Developments in Metallic Degradable Micromotors for Biomedical and Environmental Remediation Applications

第十二次全国岩石力学与工程学术大会

作者： choi Sangki Kwon H.j.choi j.W.choi Department of Energy Resources Engineering Inha University Korea Atomic Energy Research Institute

In Korea,21 nuclear power plants are operating and more than 11,000 tons of spent fuels, which are now stored at interim storage at the reactor sites,had been *** many other countries operating nuclear power plants,the safe and reliable management of spent fuel is an urgent national issue for the sustainable utilization of nuclear *** considers deep geological disposal as a most promising ways for the disposal of spent fuel or high-level *** a long term research and development started in 1997,Korea Atomic Energy

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Nano-Micro Letters 2024年第3期16卷 1-35页

作者： Sourav Dutta Seungmin Noh Roger Sanchis Gual Xiangzhong Chen Salvador Pané Bradley j.Nelson Hongsoo choi Department of Robotics and Mechatronics Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Republic of Korea DGIST‑ETH Microrobotics Research Center DGISTDaegu 42988Republic of Korea Multi‑Scale Robotics Lab Institute of Robotics and Intelligent SystemsETH Zurich8092 ZurichSwitzerland Institute of Optoelectronics State Key Laboratory of Photovoltaic Science and TechnologyShanghai Frontiers Science Research Base of Intelligent Optoelectronics and PerceptionFudan UniversityShanghai 200433People’s Republic of China

Synthetic micromotor has gained substantial attention in biomedicine and environmental ***-based degradable micromotor composed of magnesium(Mg),zinc(Zn),and iron(Fe)have promise due to their nontoxic fuel-free propulsion,favorable biocompatibility,and safe excretion of degradation products Recent advances in degradable metallic micromotor have shown their fast movement in complex biological media,efficient cargo delivery and favorable biocompatibility.A noteworthy number of degradable metal-based micromotors employ bubble propulsion,utilizing water as fuel to generate hydrogen *** novel feature has projected degradable metallic micromotors for active in vivo drug delivery *** addition,understanding the degradation mechanism of these micromotors is also a key parameter for their design and *** propulsion efficiency and life span govern the overall performance of a degradable metallic *** we review the design and recent advancements of metallic degradable ***,we describe the controlled degradation,efficient in vivo drug delivery,and built-in acid neutralization capabilities of degradable micromotors with versatile biomedical ***,we discuss micromotors’efficacy in detecting and destroying environmental ***,we address the limitations and future research directions of degradable metallic micromotors.

关键词： Magnesium Zinc Iron Biodegradable microrobot Biomedical Environmental