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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.w.th 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)

Inclusive quasielastic neutrino-nucleus scattering with energy density functional nuclear models

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Chinese Physics C 2024年第8期48卷 153-158页

作者： K.s.Kim soonchul choi Hana Gil Chang Ho Hyun school of liberal arts and science korea aerospace universitygoyang 10540korea Center for exotic nuclear studies institute for basic sciencedaejeon 34126korea Center for extreme nuclear matters korea universityseoul 02841korea Department of physics education daegu universitygyeongsan 38453korea

In this study,we calculated the inclusive charged-current neutrino-nucleus scattering from ^(40)Ar in the quasielastic *** explore the effect of uncertainties stemming from the nuclear structure,we used the KIDs(Korea-IBs-Daegu-sKKU)nuclear energy density functional and skyrme force models,namely sLy4,skI3,and *** models.w.re selected to have distinct behavior in terms of the density dependence of the symmetry energy and the effective mass of the *** the charged-current neutrino scattering,the single-and double-differential cross sections.w.re calculated for various *** cross sections are reported as a function of the incident neutrino *** theoretical cross sections.w.re compared with experimental data,and the roles of the effective mass and symmetry energy were investigated in terms of charged-current neutrino-nucleus scattering.

关键词： energy density functional neutrino-nucleus scattering symmetry energy effective mass of the nucleon

基于MRI检查对经椎间孔硬膜外类固醇注射治疗腰椎间盘突出所致的神经根病变的结果预测

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国际医学放射学杂志 2013年第2期 188-189页

作者： J.w. Lee s.w. choi s.H. Park G.Y. Lee H.s. Kang 郭凌飞 Department of Radiology Seoul National University Bundang Hospital300 Gumidong Bundag-GuSeong NamGyeongi-Do 463-707Korea

目的评估MRI检查对经椎间孔硬膜外类固醇注射(EsI)治疗腰椎间盘突出(HIVD)所致的神经根病变的结果预测。材料与方法总共有149例经过EsI治疗的病人纳入本研究(男75例,女74例;平均年龄51.5岁),其中治疗效果最差的87例,最好的62例。以上病... 详细信息

目的评估MRI检查对经椎间孔硬膜外类固醇注射(EsI)治疗腰椎间盘突出(HIVD)所致的神经根病变的结果预测。材料与方法总共有149例经过EsI治疗的病人纳入本研究(男75例,女74例;平均年龄51.5岁),其中治疗效果最差的87例,最好的62例。以上病人选自2007年1月—2008年12月经椎间孔EsI治疗腰椎HIVD所致神经根病变的1881例病人。2名放射科医师一起回顾分析了MR成像结果。使用卡方检验和Fisher确切概率法对两组病人的差异进行了检验。结果在效果最佳组,椎间孔-椎间孔外突出的HIVD病人(16/24,66.6%)明显多于向中央-关节下突出的HIVD病人(46/125,36.8%)(P=0.012)。其他因素如椎间盘突出区、T2高信号、与神经根的相关性、角度的变化、终板的改变、椎间盘高度的减少、椎间盘退变的分级和骨赘的形成均没有显著统计学差异。结论通过MR成像的评估,经椎间孔EsI治疗神经根病变,仅椎间孔或孔外突出的病人具有较好的预后结果。要点①经椎间孔硬膜外类固醇注射现在已广泛应用于缓解腰部神经病变。②对椎间孔及孔外区域突出的椎间盘的治疗可以获得好的预后结果。③椎间盘的其他特征并不是显著的预测因素。

关键词：经椎间孔硬膜外类固醇注射椎间盘突出腰部神经根病 MRI 预测结果

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.w.th *** studies have found that ACE2 can be released with EVs.w.ich 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

Analysis and Modeling of Mobile Phone Activity Data Using Interactive Cyber-Physical social system

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Computers, Materials & Continua 2024年第9期80卷 3507-3521页

作者： Farhan Amin Gyu sang choi school of Computer science and Engineering Yeungnam UniversityGyeongsan38541Republic of Korea

Mobile networks possess significant information and thus are considered a gold mine for the researcher’s *** call detail records(CDR)of a mobile network are used to identify the network’s efficacy and the mobile user’s *** is evident from the recent literature that cyber-physical systems(CPs.w.re used in the analytics and modeling of telecom *** addition,CPs is used to provide valuable services in smart *** general,a typical telecom company hasmillions of subscribers and thus generatesmassive amounts of *** this aspect,data storage,analysis,and processing are the key *** solve these issues,herein we propose a multilevel cyber-physical social system(CPss)for the analysis and modeling of large internet *** proposed multilevel system has three levels and each level has a specific ***,raw Call Detail Data(CDR)was collected at the first ***,the data preprocessing,cleaning,and error removal operations.w.re *** the second level,data processing,cleaning,reduction,integration,processing,and storage were ***,suggested internet activity record measures.w.re *** proposed system initially constructs a graph and then performs network *** proposed CPss system accurately identifies different areas of internet peak usage in a city(Milan city).Our research is helpful for the network operators to plan effective network configuration,management,and optimization of resources.

关键词： Cyber-physical social systems big data cyber-physical systems pervasive computing smart city big data management techniques

Modeling asymmetric fracture mechanics of Mg alloy wire in drawing process

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Journal of Magnesium and Alloys 2024年第5期12卷 2057-2069页

作者： sunghoon choi Jongwon shin Joung sik suh Dongchoul Kim Department of Mechanical Engineering Sogang UniversitySeoul04107Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

In this study,a numerical analysis.w.s conducted on the ductile fracture of a 2-mm diameter Mg-1Zn-0.5Mn-0.5sr-0.1Ca alloy wire during *** hexagonally close-packed crystal structure of Mg alloys causes asymmetric fracture behavior,especially in the compression *** aim of this study is to develop a comprehensive damage model for Mg alloy wire that accurately predicts ductile fracture,with a focus on the compression region.A novel experimental method was introduced to measure the ductile fracture of Mg alloy wires under different stress *** wire drawing process.w.s simulated using the Generalized Incremental stress-state dependent damage(GIssMO)Model and the semi-Analytical Model for Polymers(sAMP)*** damage model's prediction and the experimental results.w.re found to be in excellent agreement,especially in determining crack *** analysis established a safe zone diagram for die angle and reduction ratio,and experimental validation confirmed the feasibility of this *** proposed damage model can provide a practical and reliable analysis for optimizing the drawing process of Mg alloy wire.

关键词： Mg alloy wire drawing Finite element method Damage model safe zone diagram

Effects of low molecular weight polysaccharide from sargassum thunbergii against palmitic acid-induced intracellular lipid accumulation in 3T3-L1 adipocyte and HepG2 cells

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Food science and Human wellness 2024年第4期13卷 2244-2252页

作者： Hyo-Geun Lee D.P.Nagahawatta M.J.M.s.Kurera Kyung-Mo song Yun-sang choi You-Jin Jeon Min-Cheol Kang Department of Marine Life sciences Jeju National UniversityJeju 63243Republic of Korea Department of Biotechnology Faculty of Agriculture and Plantation ManagementWayamba University of Sri LankaMakanduraGonawila(NWP)60170Sri Lanka Research Group of Food Processing Korea Food Research Institute245Wanju 55365Republic of Korea

Low molecular weight polysaccharides can be isolated from sargassum thunbergii(LMPsT)and in vitro experiments.w.re conducted to evaluate the inhibitory effects on *** natures of LMPsT were attained from *** and appraised their LMPsT on palmitic acid(PA)induced lipid accretion in Hep G2,and 3T3-L1 *** treatment lessened lipid deposition and intracellular free fatty acid and triglyceride intensities in PA-treated above mentioned *** mechanistic study publicized that LMPsT2 significantly suppressed adipogenesis and stimulated the PA-treated 3T3-L1 cells occupied in the lipolysis ***,in PA-treated Hep G2 cells,the free fatty acid oxidation was significantly increased by *** these constructive properties of LMPsT2 from ***,is a potential candidate for diminishing the intracellular lipids,and for a therapeutic agent in those conditions.

关键词： sargassum thunbergii Low molecular weight polysaccharide Lipid accumulation Obesity Liver steatosis

The Association between Fear of COVID-19,Obsession with COVID-19,and Post Traumatic stress Disorder in Korean Emergency Rescue Firefighters:A Cross-sectional study

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International Journal of Mental Health Promotion 2024年第6期26卷 475-480页

作者： Yun-Jung choi Heewon song Red Cross College of Nursing Chung-Ang UniversitySeoulSouth Korea Department of Nursing Chung-Ang UniversitySeoulSouth Korea

During the rapid spread of COVID-19,first responders are at risk of being exposed to COVID-19 due to their role in providing first aid and responding to an unspecified number of *** uncertainty can have adverse mental health effects,such as increased anxiety and *** study aimed to investigate the degree of association between fear of COVID-19,obsession with COVID-19,and post-traumatic stress disorder(PTsD)in emergency rescue *** participants.w.re 150 emergency rescue firefighters.w.rking in Region s,*** filled out self-report questionnaires:The data obtained through the Fear of COVID-19 scale,Obsession with COVID-19 scale,and Impact of Event scale-Revised Korean version were subjected to nonparametric statistical analysis using sPss.w.N *** study found a significant correlation between emergency rescue firefighters’fear of COVID-19,obsession with COVID-19,and *** and obsession with COVID-19 were higher among first responder firefighters.w.o were directly involved in COVID-19-related ***,a one-point increase in obsession was associated with a 2.837-point increase in *** on the results.w. found that there is a need for effective control of obsessions and fears among first responder firefighters during COVID-19,and we suggest that there is a need for mental health care for first responder firefighters during the pandemic through the development and support of programs to prevent and mitigate obsessions.

关键词： COVID-19 emergency rescue firefighters fear of COVID-19 mental health promotion obsession with COVID-19 PTsD

Investigation of the nutritional and functional roles of a combinational use of xylanase and β-glucanase on intestinal health and growth of nursery pigs

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Journal of Animal science and Biotechnology 2024年第5期15卷 1932-1950页

作者： Hyunjun choi Yesid Garavito Duarte Guilherme A.M.Pasquali sung woo Kim Department of Animal science North Carolina State University116 Polk HallCampus Box 7621RaleighNC 27695USA BAsF sE Ludwigshafen 67056Germany

Background Xylanase andβ-glucanase combination(XG)hydrolyzes soluble non-starch polysaccharides that are anti-nutritional *** study aimed to evaluate the effects of increasing levels of XG on intestinal health and growth performance of nursery *** Forty pigs(6.5±0.4 kg)were assigned to 5 dietary treatments and fed for 35 d in 3 phases(11,9,and 15 d,respectively).Basal diets mainly included corn,soybean meal,and corn distiller's dried grains.w.th solubles,contained phytase(750 FTU/kg),and were supplemented with 5 levels of XG at(1)0,(2)280 TXU/kg xylanase and 125 TGU/kgβ-glucanase,(3)560 and 250,(4)840 and 375,or(5)1,120 and 500,*** performance was *** d 35,all pigs.w.re euthanized and jejunal mucosa,jejunal digesta,jejunal tissues,and ileal digesta were collected to determine the effects of increasing XG levels and XG intake on intestinal *** Increasing XG intake tended to quadratically decrease(P=0.059)viscosity of jejunal digesta(min:1.74 m Pa·s at 751/335(TXU/TGU)/kg).Increasing levels of XG quadratically decreased(Psed(Psed(Ps of XG tended to linearly decrease(P=0.073)jejunal Ig G and tended to quadratically increase(P=0.085)jejunal villus height to crypt depth ratio(max:2.62 at 560/250(TXU/TGU)/kg).Increasing XG intake tended to linearly increase the apparent ileal digestibility of dry matter(P=0.087)and ether extract(P=0.065).Increasing XG intake linearly increased(Pse of xylanase andβ-glucanase would hydrolyze the non-starch polysaccharides fractions,positively modulating the jejunal mucosa-associated *** intake of

关键词： Glucanase Growth performance Intestinal health Nursery pigs Xylanase

TEAM:Transformer Encoder Attention Module for Video Classification

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Computer systems science & Engineering 2024年第2期48卷 451-477页

作者： Hae sung Park Yong suk choi Department of Artificial Intelligence Hanyang UniversitySeoulKorea Department of Computer science Hanyang UniversitySeoulKorea

Much like humans focus solely on object movement to understand actions,directing a deep learning model’s attention to the core contexts.w.thin videos is crucial for improving video *** the recent study,Video Masked Auto-Encoder(VideoMAE)employs a pre-training approach with a high ratio of tube masking and reconstruction,effectively mitigating spatial bias due to temporal redundancy in full video *** steers the model’s focus toward detailed temporal ***,as the VideoMAE still relies on full video frames during the action recognition stage,it may exhibit a progressive shift in attention towards spatial contexts,deteriorating its ability to capture the main spatio-temporal *** address this issue,we propose an attention-directing module named Transformer Encoder Attention Module(TEAM).This proposed module effectively directs the model’s attention to the core characteristics.w.thin each video,inherently mitigating spatial *** TEAM first figures out the core features among the overall extracted features from each *** that,it discerns the specific parts of the video where those features are located,encouraging the model to focus more on these informative ***,during the action recognition stage,the proposed TEAM effectively shifts the VideoMAE’s attention from spatial contexts towards the core spatio-temporal *** attention-shift manner alleviates the spatial bias in the model and simultaneously enhances its ability to capture precise video *** conduct extensive experiments to explore the optimal configuration that enables the TEAM to fulfill its intended design purpose and facilitates its seamless integration with the VideoMAE *** integrated model,i.e.,VideoMAE+TEAM,outperforms the existing VideoMAE by a significant margin on something-something-V2(71.3%vs.70.3%).Moreover,the qualitative comparisons demonstrate that the TEAM encourages the model to disregard insignificant featur

关键词： Video classification action recognition vision transformer masked auto-encoder