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Factor analysis of recent major heatwaves in East Asia

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Geoscience Frontiers 2024年第1期15卷 374-383页

作者： Arim Yoon Jeongwon Kim Jooyeop Lee Hyun Min Sung Je-Woo hong Seung-Ki Min Junhong Lee jinkyu hong Ecosystem-Atmosphere Process Laboratory Department of Atmospheric SciencesYonsei UniversitySeoul 03722Republic of Korea National Institute of Meteorological Sciences Jeju 63568Republic of Korea Korea Adaptation Center for Climate Korea Environment InstituteSejong 30121Republic of Korea Division of Environmental Science and Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Max Planck Institute for Meteorology Hamburg 20146Germany Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoulRepublic of Korea

Heatwaves(HWs)present a major hazard to our society and more extreme heatwaves are expected with future climatic ***,it is important to improve our understanding of the underlying processes that drive HWs,in order to boost our socioeconomic-ecological *** this study,we quantified the influences of key driving factors(large-scale atmospheric circulation,soil moisture,and sea surface temperature)and their synergies on recent heatwaves in East *** conducted a factor separation analysis for three recent HW events by constraining the key factors in the regional Weather Research and Forecasting model with their climatologies or pseudo-observations in different *** study showed distinct spatial variations in the HW-controlling factors in East *** synergistic interaction of large-scale circulation and soil moisture was the most important factors in the 2013 Chinese *** the 2018 HWs in Korea and Japan,the same stagnant large-scale atmospheric circulation played a dominant role in driving the HW *** land-atmosphere coupling via soil moisture,its interaction with circulation,and SST exhibited stronger influences during the Korean HW than the Japanese *** analysis also revealed temporal variations in the factors driving Korean and Chinese HWs due to typhoon passage and other multiple processes over heterogeneous surfaces(i.e.,topographically induced Foehn winds,large-scale warm advection from the warm ocean,spatial differences in soil moisture).Our findings suggest that future heatwave-related studies should consider interactive contributions of key factors,their interplay with surface heterogeneities of complex terrain.

关键词： Heatwave East Asia Large-scale circulation Soil moisture Sea surface temperature Synergistic impacts

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折纸超材料合规机制的设计

Acta Mechanica Sinica 2023年第7期39卷 61-70页

作者： Yasuhiro Miyazawa Hiromi Yasuda jinkyu Yang Department of Aeronautics and Astronautics University of WashingtonSeattleWashington 98195USA Aviation Technology Directorate Japan Aerospace Exploration AgencyMitakaTokyo 810015Japan Department of Mechanical Engineering Seoul National UniversitySeoul 08826Republic of Korea

折纸作为一种折纸艺术,几个世纪以来一直被艺术家们广泛探索.直到最近几十年,它才因其复杂的几何形状和丰富的力学性能而受到数学家和工程师的关注.以折纸为灵感的超材料的激增为材料和结构的设计打开了一扇新的窗口.通常,会根据标有合... 详细信息

折纸作为一种折纸艺术,几个世纪以来一直被艺术家们广泛探索.直到最近几十年,它才因其复杂的几何形状和丰富的力学性能而受到数学家和工程师的关注.以折纸为灵感的超材料的激增为材料和结构的设计打开了一扇新的窗口.通常,会根据标有合规机制的折痕线折叠一张材料来构建折纸结构.尽管它们在折纸制造中很重要,但在折纸超材料的设置中,这种合规机制尚未得到探索.本研究探讨了合规机制设计参数与折纸力学性能之间的关系.尤其我们采用的是单铰链折痕和Kresling折纸,这是刚性和非刚性折纸单元的代表性示例,采用双针穿孔兼容机构设计制造.我们使用不同的折痕参数进行轴向压缩测试,并将结果拟合到由轴向和扭转弹簧组成的棒铰折纸模型中.使用高斯回归过程提取弹簧系数和折痕参数之间的关系.结果表明,折痕参数的变化以非常不同的方式对每个弹簧元件有显著贡献,这表明合规机制根据变形模式的微调性.特别是,刚性和非刚性折纸的弹簧刚度随折痕参数而变化不同,即使调整了相同的折痕参数也是如此.此外,我们报道了Kresling折纸的定性静态响应只需改变折痕参数,就可以在单稳态和双稳态之间,或者线性和非线性之间调节,同时可以保持相同的折叠图案几何形状.我们相信,我们的结果为折纸机械超材料的褶皱选择合规机制提供了一个库和指南.

关键词：几何形状折痕超材料弹簧元件折纸扭转弹簧非刚性单稳态

Kohn–Sham time-dependent density functional theory with Tamm–Dancoff approximation on massively parallel GPUs

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npj Computational Materials 2023年第1期9卷 1556-1567页

作者： Inkoo Kim Daun Jeong Won-Joon Son Hyung-Jin Kim Young Min Rhee Yongsik Jung Hyeonho Choi jinkyu Yim Inkook Jang Dae Sin Kim Innovation Center Samsung ElectronicsHwaseong 18448Republic of Korea Department of Chemistry Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Samsung Advanced Institute of Technology Samsung ElectronicsSuwon 16678Republic of Korea

We report a high-performance multi graphics processing unit(GPU)implementation of the Kohn–Sham time-dependent density functional theory(TDDFT)within the Tamm–Dancoff *** algorithm on massively parallel computing systems using multiple parallel models in tandem scales optimally with material size,considerably reducing the computational wall time.A benchmark TDDFT study was performed on a green fluorescent protein complex composed of 4353 atoms with 40,518 atomic orbitals represented by Gaussian-type functions,demonstrating the effect of distant protein residues on the *** the largest molecule attempted to date to the best of our knowledge,the proposed strategy demonstrated reasonably high efficiencies up to 256 GPUs on a custom-built state-of-the-art GPU computing system with Nvidia A100 *** believe that our GPU-oriented algorithms,which empower first-principles simulation for very large-scale applications,may render deeper understanding of the molecular basis of material behaviors,eventually revealing new possibilities for breakthrough designs on new material systems.

关键词： GPUs graphics massive

Cell-homing and immunomodulatory composite hydrogels for effective wound healing with neovascularization

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Bioactive Materials 2024年第6期36卷 185-202页

作者： Hayeon Byun Yujin Han Eunhyung Kim Indong Jun jinkyu Lee Hyewoo Jeong Seung Jae Huh Jinmyoung Joo Su Ryon Shin Heungsoo Shin Department of Bioengineering Hanyang University222 Wangsimni-roSeongdong-guSeoul 04763Republic of Korea Division of Engineering in Medicine Department of MedicineHarvard Medical SchoolBrigham and Women’s HospitalCambridgeMA 02139USA Environmental Safety Group Korea Institute of Science&Technology Europe(KIST-EUROPE)Saarbrücken 66123Germany Department of Biomedical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Institute of Nano Science and Technology Hanyang University222 Wangsimni-roSeongdong-guSeoul 04763Republic of Korea

Wound healing in cases of excessive inflammation poses a significant challenge due to compromised ***,we propose a multi-functional composite hydrogel engineered to overcome such conditions through recruitment and activation of macrophages with adapted degradation of the *** composite hydrogel(G-TSrP)is created by combining gelatin methacryloyl(GelMA)and nanoparticles(TSrP)composed of tannic acid(TA)and Sr^(2+).These nanoparticles are prepared using a one-step mineralization process assisted by metal-phenolic network formation.G-TSrP exhibits the ability to eliminate reactive oxygen species and direct polarization of macrophages toward M2 *** has been observed that the liberation of TA and Sr^(2+)from G-TSrP actively facilitate the recruitment and up-regulation of the expression of extracellular matrix remodeling genes of macrophages,and thereby,coordinate in vivo adapted degradation of the *** significantly,G-TSrP accelerates angiogenesis despite the TA’s inhibitory properties,which are counteracted by the released Sr^(2+).Moreover,G-TSrP enhances wound closure under inflammation and promotes normal tissue formation with strong vessel *** analysis confirms macrophage-mediated wound healing by the composite ***,these findings pave the way for the development of biomaterials that promote wound healing by creating regenerative environment.

关键词： Immunomodulation Wound healing Neovascularization Multi-functional nanoparticles Composite hydrogels

Improvement of resolution in 2-D gel analysis by simple pre-treatment of human urine with EDTA

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Open Journal of Clinical Diagnostics 2012年第2期2卷 40-43页

作者： Jin-Woo Lee Ju-Young Lee jinkyu Lim Department of Animal Science and Biotechnology Kyungpook University Daegu Korea

Regardless of thermodynamic stability, less complex proteome than plasma, convenient and noninvasive sampling of urine, reproducibility and comparability of the data among laboratories are challenges for the urine proteome analysis. Pretreatment of urine with 10 mM EDTA in conjunction with desalting methods to remove interfering molecules significantly improved the presentation of urine proteome on 2-D gels. Statistical analysis of the average ratio of the spot numbers on 2-D gels between EDTA-treated and non-treated samples were 1.35 ± 0.167, 1.26 ± 0.091, and 1.24 ± 0.095 for dialysis, ultrafiltration, and desalting column, respectively, with the p-value of 5.85 × 10–6 for the overall comparison. This result came from the fact that EDTA-treated samples showed better resolutions with less streaks and clearer spots on 2-D gels than the control samples. The results suggest that a simple and non-fractionating EDTA-treatment can be employed to the procedures for the high resolution 2-D gel analysis and other urinary proteomic analysis.

关键词： Urine EDTA-Treatment Interfering Molecules 2-D Gel Resolution

Ambient synthesis, characterization, and electrochemical activity of LiFePO4 nanomaterials derived from iron phosphate intermediates

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Nano Research 2015年第8期8卷 2573-2594页

作者： Jonathan M. Patete Megan E. Scofield Vyacheslav Volkov Christopher Koenigsmann Yiman Zhang Amy C. Marschilok Xiaoya Wang Jianming Bai jinkyu Han Lei Wang Feng Wang Yimei Zhu Jason A. Graetz Stanislaus S. Wong Department of Chemistry State University of New York at Stony Brook Stony Brook NY 77794-3400 USA Condensed Matter Physics and Materials Sciences Department Building 480 Brookhaven National Laboratory Upton NY 11973 USA Department of Materials Science and Engineering State University of New York at Stony Brook Stony Brook NY 11794-2275 USA Sustainable Energy Technologies Department Building 815 Brookhaven National Laboratory Upton NY 11973 USA National Synchrotron Light Source II Building 741 Brookhaven National Laboratory Upton NY 11973 USA

LiFePO4 materials have become increasingly popular as a cathode material due to the many benefits they possess including thermal stability, durability, low cost, and long life span. Nevertheless, to broaden the general appeal of this material for practical electrochemical applications, it would be useful to develop a relatively mild, reasonably simple synthesis method of this cathode material. Herein, we describe a generalizable, 2-step methodology of sustainably synthesizing LiFePO4 by incorporating a template-based, ambient, surfactantless, seedless, U-tube protocol in order to generate size and morphologically tailored, crystalline, phase-pure nanowires. The purity, composition, crystallinity, and intrinsic quality of these wires were systematically assessed using transmission electron microscopy （TEM）, high-resolution TEM （HRTEM）, scanning electron microscopy （SEM）, X-ray diffraction （XRD）, selected area electron diffraction （SAED）, energy dispersive analysis of X-rays （EDAX）, and high-resolution synchrotron XRD. From these techniques, we were able to determine that there is an absence of any obvious defects present in our wires, supporting the viability of our synthetic approach. Electrochemical analysis was also employed to assess their electrochemical activity. Although our nanowires do not contain any noticeable impurities, we attribute their less than optimal electrochemical rigor to differences in the chemical bonding between our LiFePO4 nanowires and their bulk-like counterparts. Specifically, we demonstrate for the first time experimentally that the Fe-O3 chemical bond plays an important role in determining the overall conductivity of the material, an assertion which is further supported by recent ＂first-principles＂ calculations. Nonetheless, our ambient, solution-based synthesis technique is capable of generating highly crystalline and phase-pure energy-storage-relevant nanowires that can be tailored so as to fabricate different sized materials of repro

关键词： ambient synthesis template synthesis cathode material lithium iron phosphate nanostructures

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手性力学超材料中的外尔点与表面弹性波

手性力学超材料中的外尔点与表面弹性波