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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 were 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 were calculated for various *** cross sections are reported as a function of the incident neutrino *** theoretical cross sections were 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

An in vivo Evaluation of Ultra-fine Grained Titanium Implants

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Journal of Materials Science & Technology 2009年第4期25卷 556-560页

作者： S. Bindu k.P. Sanosh k. Smetana A. Balakrishnan T.N. kim Department of Life Science and Genetic Engineering Paichai University Department of Information and Electronic Materials Engineering Paichai University Charles University 1st and 2nd Faculty of MedicineInstitute of Anatomy and Center of Cell Therapy and Tissue Repair

The present work focuses mainly on an in vivo evaluation of ultra fine grained titanium （UFG-Ti） obtained by severe plastic deformation （SPD）. The SPD on commercially produced Grade 2 titanium （Cp-Ti） resulted in the refinement of the grain size by several orders of magnitude. Polished surfaces having similar roughness from both UFG-Ti and Cp-Ti were prepared. In vitro test revealed the presence of fibronectin, which was involved in the attachment of the cells to the substrate. Phase contrast micrographs showed the highest signal of fibronectin in UFG-Ti, indicating that it is more cytocompatible than Cp-Ti. In vivo tests, by subcutaneous implantation of the metals in the rats showed the better biocompatibility of UFG-Ti over Cp-Ti. The improved biocompatibility of UFG-Ti was attributed to the presence of surface discontinuities （in the form of nano-defects）, surface energy, higher wettability, surface stress and stable TiO2 films, which increased the protein adsorption on the surface.

关键词： Surfaces Grain size Titanium In vivo Biocompatibility

Electrically controlled mRNA delivery using a polypyrrolegraphene oxide hybrid film to promote osteogenic differentiation of human mesenchymal stem cells

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Nano Research 2022年第10期15卷 9253-9263页

作者： Huijung kim kübra Solak Yoojoong Han Yeon-woo Cho kyeong-Mo koo Chang-Dae kim Zhengtang Luo Hyungbin Son Hyung-Ryong kim Ahmet Mavi Tae-Hyung kim School of Integrative Engineering Chung-Ang University84 Heukseuk-roDongjak-guSeoul 06974Republic of Korea Department of Nanoscience and Nanoengineering Graduate School of Natural and Applied SciencesAtatürk UniversityErzurum 25240Turkey Department of Chemical and Biological Engineering Hong Kong University of Science and TechnologyKowloonHong Kong 999077China Department of Pharmacology College of DentistryJeonbuk National UniversityJeonju 54896Republic of Korea Department of Nanoscience and Nanoengineering Institute of ScienceAtatürk UniversityErzurum 25240Turkey Department of Mathematics and Science Education Education Faculty of Kazım KarabekirAtatürk UniversityErzurum 25240Turkey

Direct messenger ribonucleic acid(mRNA)delivery to target cells or tissues has revolutionized the field of ***,the applicability of regenerative medicine is limited by the technical difficulties of various mRNA-loaded ***,we report a new conductive hybrid film that could guide osteogenic differentiation of human adipose-derived mesenchymal stem cells(hADMSCs)via electrically controlled mRNA *** find optimal electrical conductivity and mRNAloading capacity,the polypyrrole-graphene oxide(PPy-GO)hybrid film was electropolymerized on indium tin oxide *** found that the fluorescein sodium salt,a molecule partially mimicking the physical and chemical properties of mRNAs,can be effectively absorbed and released by electrical stimulation(ES).The hADMSCs cultivated on the PPy-GO hybrid film loaded with pre-osteogenic mRNAs showed the highest osteogenic differentiation under electrical *** platform can load various types of RNAs thus highly promising as a new nucleic acid delivery tool for the development of stem cell-based therapeutics.

关键词： messenger ribonucleic acid(mRNA)delivery polypyrrole graphene oxide electrical release mesenchymal stem cells

Introduction to the themed articles on ionic polymer-metal composites

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International Journal of Smart and Nano Materials 2012年第3期3卷 183-187页

作者： kim, kwang J. Leang, kam k. Department of Mechanical Engineering University of Nevada Reno NV 89557-0312 United States Department of Mechanical Engineering University of Nevada Las Vegas NV 89154-4027 United States

Over the past two decades,we have observed an explosive growth in the field of electroactive polymers(EAPs),polymers that respond to external stimuli by changing their shape or size or even when mechanically stressed produce a measurable charge[1-6].Specifically,the research on the ionic EAP,such as ionic polymer-metal composites(IPMCs),has attracted international *** IPMC material has the ability to function as an actuator or a sensor in both air and wet environments,and generally IPMCs require low voltages(within the polymer material.

关键词： composites material. IPMC

Hetero-deformation promoted strengthening and toughening in BCC rich eutectic and near eutectic high entropy alloys

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Journal of Materials Science & Technology 2023年第15期146卷 1-9页

作者： D.H.Chung J.Lee Q.F.He Y.k.kim k.R.Lim H.S.kim Y.Yang Y.S.Na Department of Special Alloys Extreme Materials Research InstituteKorea Institute of Materials ScienceChangwonThe Republic of Korea Department of Mechanical Engineering City University of Hong KongKowloon TongKowloonHong KongChina Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohangThe Republic of Korea Center for Heterogenic Metal Additive Manufacturing Pohang University of Science and TechnologyPohangThe Republic of Korea Department of Materials Science and Engineering City University of Hong KongKowloon TongKowloonHong KongChina

Heterostructured eutectic high-entropy alloys(EHEAs)have attracted significant attention owing to their novel properties,such as balanced combinations of strength and fracture ***,the toughening/strengthening mechanisms of these EHEAs have not been thoroughly *** this study,we developed a series of dual-phase Al_((18–2x))Co_(30)Cr_((11+x))Fe_((11+x))Ni_(3)0(x=-1,0,1)eutectic and neareutectic HEAs containing face-centered cubic(FCC)and body-centered cubic(BCC)*** the high amount of BCC,which is referred to as the brittle phase,newly developed EHEAs exhibited superior fracture ***,we discovered that a fully eutectic HEA exhibited further improvements in both yield stress and fracture toughness,outperforming our off-eutectic and other previously reported *** combining experiments and theoretical models,we demonstrated that the synergistic increase in both strength and toughness in our fully eutectic HEA was derived from the high hetero-deformationinduced(HDI)strengthening/toughening associated with a high misorientation angle at the grain/phase boundaries.

关键词： Eutectic high entropy alloy Fracture toughness Heterogeneous structure Hetero deformation induced strengthening Misorientation angle

Enhancing IoT anomaly detection performance for federated learning

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Digital Communications and Networks 2022年第3期8卷 314-323页

作者： Brett weinger Jinoh kim Alex Sim Makiya Nakashima Nour Moustafa k.John wu Stony Brook University Stony BrookNYUSA Lawrence Berkeley National Laboratory BerkeleyCAUSA Texas A&M University CommerceTXUSA University of New South wales CanberraAustralia

Federated Learning (FL) with mobile computing and the Internet of Things (IoT) is an effective cooperative learning approach. However, several technical challenges still need to be addressed. For instance, dividing the training process among several devices may impact the performance of Machine Learning (ML) algorithms, often significantly degrading prediction accuracy compared to centralized learning. One of the primary reasons for such performance degradation is that each device can access only a small fraction of data (that it generates), which limits the efficacy of the local ML model constructed on that device. The performance degradation could be exacerbated when the participating devices produce different classes of events, which is known as the class balance problem. Moreover, if the participating devices are of different types, each device may never observe the same types of events, which leads to the device heterogeneity problem. In this study, we investigate how data augmentation can be applied to address these challenges and improving detection performance in an anomaly detection task using IoT datasets. Our extensive experimental results with three publicly accessible IoT datasets show the performance improvement of up to 22.9% with the approach of data augmentation, compared to the baseline (without relying on data augmentation). In particular, stratified random sampling and uniform random sampling show the best improvement in detection performance with only a modest increase in computation time, whereas the data augmentation scheme using Generative Adversarial Networks is the most time-consuming with limited performance benefits.

关键词： Data augmentation Federated learning Internet of things Anomaly detection Machine learning

Power management unit chip design for automobile active-matrix organic light-emitting diode display module

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Journal of Central South University 2009年第4期16卷 621-628页

作者： kim J H PARk J H kim J H CAO T V LEE T Y BAN H J YANG k kim H G HA P B kim Y H Department of Electronic Engineering Changwon National University 9 Sarim-Dong Changwon 641-773 Korea Denso PS Electronics Corporation 47 Seongsan-Dong Changwon 641-315 Korea

A power management unit （PMU） chip supplying dual panel supply voltage, which has a low electro-magnetic interference （EMI） characteristic and is favorable for miniaturization, is designed. A two-phase charge pump circuit using external pumping capacitor increases its pumping current and works out the charge-loss problem by using bulk-potential biasing circuit. A low-power start-up circuit is also proposed to reduce the power consumption of the band-gap reference voltage generator. And the ring oscillator used in the ELVSS power circuit is designed with logic devices by supplying the logic power supply to reduce the layout area. The PMU chip is designed with MagnaChip＇s 0.25 μ high-voltage process. The driving currents of ELVDD and ELVSS are more than 50 mA when a SPICE simulation is done.

关键词： DC-DC converter AMOLED charge pumping power management unit (PMU) dual panel supply voltage

Synthesis and characterization of red-emitting Yb/Ho-CaSiO3 upconversion phosphors

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Progress in Natural Science:Materials International 2022年第5期32卷 594-601页

作者： Bina Chaudhary Yuwaraj k.kshetri Dhani Ram Dhakal Soo wohn Lee Tae-Ho kim Department of Fusion Science and Technology Sun Moon University Research Center for Green Advance Materials Sun Moon University Department of Environmental and Bio-Chemical Engineering Sun Moon University

Host material plays an important role in obtaining efficient photon upconversion and downshifting ***, fluoride and oxyfluoride glasses-based materials are used for high-efficiency photon ***, the poor thermal stability of fluoride glasses and the toxicity of fluorine ions limit their applications. In this report, Yb/Ho-doped CaSiO3wollastonite phosphors have been demonstrated as efficient red-emitting upconversion phosphors. The phosphors have been synthesized by microwave hydrothermal process followed by heat treatment at 1050°C in the air environment. 2M phase of the β-wollastonite has been confirmed by X-ray diffraction and Raman spectroscopy while the existence of the Yb and Ho dopants in the CaSiO3lattice has been confirmed by X-ray photoelectron spectroscopy. The synthesized samples showed strong red upconversion emission centered at 662 nm and near-infrared downshifting emissions at 2016 nm upon 980 nm excitation. The emissions were found to depend significantly on the Ho concentration. Temporal evolution of the main emission bands was investigated to show that the energy transfer upconversion from Yb to Ho ions was responsible for the efficient upconversion and downshifting phenomenon.

关键词： wollastonites Upconversion Downshifting Red-emitting phosphors

Enhanced thermoelectric performance of spark plasma sintered p-type Ca_(3-x)Y_(x)Co_(4)O_(9+δ)systems

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Journal of Materials Science & Technology 2020年第20期52卷 212-222页

作者： J.S.Cha D.H.kim H.Y.Hong k.Park Faculty of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul05006Republic of Korea

Highly textured dense Ca3-xYxCo4 O9+δ(0≤x≤0.3)samples were fabricated by combining sol-gel process with spark plasma sintering(SPS).Y^3+substitution for Ca^2+simultaneously increased the Seebeck coefficient and reduced the thermal *** latter was attributed to the increase in lattice anharmonicity,structural distortion,and grain boundary area,which enhanced the phonon ***2.7Y0.3Co4 O9+δshowed the largest dimensionless figure-of-merit(ZT=0.194)at 1073 k because it had the largest Seebeck coefficient and the lowest thermal *** ZT value was 55%larger than that of undoped Ca3 Co4 O9(0.125 at 1073 k).Therefore,Y^3+substitution,sol-gel powder synthesis,and SPS are highly effective for enhancing the thermoelectric prope rties of Ca_(3)Co_(4)O_(9).

关键词： Electrical conductivity Ca_(3)Co_(4)O_(9) Thermoelectric properties Seebeck coefficient Thermal conductivity Spark plasma sintering