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Development of two-axis control index table driven by direct drive motors

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Journal of Central South University 2011年第6期18卷 1962-1968页

作者： KIM jae-hyun lee Choon-man School of Mechatronics Changwon National University

The stability and reliability of a tilting index table should be considered at the design stage. A design method for the lightweight and improvement of the stability of the structure in a tilting index table was proposed using a commercial analysis program, ANSYS Workbench 12, by analyzing the static-thermal characteristics of the developed high-accuracy tilting index table at its design stage. The results of the performed structural analysis show that the maximum stress is generated at the stock tail part. An optimum design for the stock tail part was carried out to reduce the maximum stress and deformation. Also, the design variables were determined by considering the support of the stock tail part for the C-axis body. In the comparison of the results before and after the optimization, the maximum deformation and stress are improved by 2.8% and 8%, respectively.

关键词： tilting index table structural analysis modal analysis thermal analysis optimum design

Prothrombin kringle-2, a mediator of microglial activation: new insight in Alzheimer’s disease pathogenesis

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Neural Regeneration Research 2022年第12期17卷 2675-2676页

作者： jae Man lee Sang Ryong Kim Department of Biochemistry and Cell Biology Cell and Matrix Research InstituteSchool of MedicineKyungpook National UniversityDaeguKorea Brain Science and Engineering Institute Kyungpook National UniversityDaeguKorea School of Life Sciences BK21 FOUR KNU Creative BioResearch GroupInstitute of Life Science and BiotechnologyKyungpook National UniversityDaeguKorea

Microglial activation in Alzheimer’s disease(AD):In 1907,*** Alzheimer,a Bavarian-born German psychiatrist and neuropathologist,published an article describing the clinical and neuropathological features of an unclassified psychiatric *** disorder was later named AD and is currently the most common brain disorder(Takata et al.,2021).AD involves the accumulation of amyloid-β(Aβ)and hyperphosphorylated tau proteins in the brain,which are associated with senile plaques and neurofibrillary tangles,respectively(Vergara et al.,2019;Takata et al.,2021).AD is characterized by cognitive impairment and memory loss with hippocampal neurodegeneration(Kim et al.,2021).

关键词： Alzheimer Aβ tau

Significance of adverse outcome pathways in biomarker-based environmental risk assessment in aquatic organisms

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Journal of Environmental Sciences 2015年第9期27卷 115-127页

作者： Jin Wuk lee Eun-Ji Won Sheikh Raisuddin jae-Seong lee Department of Biological Science College of Science Sungkyunkwan University Department of Medical Elementology and Toxicology Hamdard University

In environmental risk assessments（ERA）, biomarkers have been widely used as an early warning signal of environmental contamination. However, biomarker responses have limitation due to its low relevance to adverse outcomes（e.g., fluctuations in community structure, decreases in population size, and other similar ecobiologically relevant indicators of community structure and function）. To mitigate these limitations, the concept of adverse outcome pathways（AOPs） was developed. An AOP is an analytical, sequentially progressive pathway that links a molecular initiating event（MIE） to an adverse outcome. Recently, AOPs have been recognized as a potential informational tool by which the implications of molecular biomarkers in ERA can be better understood. To demonstrate the utility of AOPs in biomarker-based ERA, here we discuss a series of three different biological repercussions caused by exposure to benzo（a）pyrene（Ba P）, silver nanoparticles（Ag NPs）, and selenium（Se）. Using mainly aquatic invertebrates and selected vertebrates as model species, we focus on the development of the AOP concept. Aquatic organisms are suitable bioindicator species whose entire lifespans can be observed over a short period; moreover, these species can be studied on the molecular and population ***, interspecific differences between aquatic organisms are important to consider in an AOP framework, since these differences are an integral part of the natural *** development of an environmental pollutant-mediated AOP may enable a better understanding of the effects of environmental pollutants in different scenarios in the diverse community of an ecosystem.

关键词： Adverse outcome pathway Biomarker Omics Environmental risk assessment Aquatic organisms Interspecific difference

Electrochemical characteristics of phosphorus doped Si-C composite for anode active material of lithium secondary batteries

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中国有色金属学会会刊：英文版 2009年第4期19卷 1018-1022页

作者： jae-Hyun NOH Kwan-Yo ung lee Joong-Kee lee Battery Research Center Korea Institute of Science and Technology Department of Chemical and Biological Engineering Korea University

Phosphorus doped silicon-carbon composite particles were synthesized through a DC arc plasma ***(SiH4) and methane(CH4) were introduced into the reaction chamber as the precursor of silicon and carbon,***(PH3) was used as a phosphorus dopant *** of synthesized particles were carried out by scanning electron microscopy(SEM),X-ray diffractometry(XRD),X-ray photoelectron spectroscopy(XPS) and bulk resistivity *** properties were investigated by cyclic test and electrochemical voltage spectroscopy(EVS).In the experimental range,phosphorus doped silicon-carbon composite electrode exhibits enhanced cycle performance than intrinsic silicon and phosphorus doped *** can be explained that incorporation of carbon into silicon acts as a buffer matrix and phosphorus doping plays an important role to enhance the conductivity of the electrode,which leads to the improvement of the cycle performance of the cell.

关键词：电化学特性磷掺杂负极活性材料磷硅电池材料锂离子 X射线光电子能谱扫描电子显微镜

The use of artificial nest boxes by Siberian flying squirrels (Pteromys volans) in South Korea

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Journal of Forestry Research 2019年第3期30卷 1131-1137页

作者： Jong-U Kim Woo-shin lee Eun-jae lee Department of Forest Sciences Seoul National University Seoul 08826Republic of Korea Urban Planning Research Division Daejeon Sejong Research InstituteDaejeon 34863Republic of Korea

In this study, we examined the use of artificial nest boxes by Siberian flying squirrels (Pteromys volans) in three coniferous and mixed forests in Gangwon Province, South Korea. Six hundred and twelve boxes with different sized entry holes (ranging from 3 to 7 cm in diameter) were placed in the forests between 2004 and 2009. Pteromys volans used nine boxes in the coniferous forests and two boxes in the mixed forests. The squirrels only used boxes with entrance holes measuring 3.5, 4, and 5 cm in diameter, showing a strong and moderate preference for boxes with 5 and 4-cm holes, respectively, and a strong avoidance for boxes with 3- and 7-cm holes. Therefore, we suggest placing artificial nest boxes with entrance holes 5 cm in diameter to encourage breeding activity. Most nests made in the artificial boxes were composed of fibrous materials from woody vines. We recommend placing artificial nest boxes with holes of 5-cm diameter in coniferous forests, which support dense populations of P. volans, to survey whether this approach would positively affect the breeding habits and population maintenance of this species.

关键词： Artificial nest box Coniferous forests Nest materials Siberian flying squirrel Woody vines

Development of oxide dispersion strengthened ferritic steels with and without aluminum

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Frontiers in Energy 2012年第1期6卷 29-34页

作者： jae Hoon lee Sheet Products&Process Research Gr. POSCO Technical Research Laboratories 699Gumho-dongGwangyang-siJeonnam 545-090Republic of Korea

Pure Fe, Cr, AI, Ti elemental powders and prealloyed Y203 powder were processed by high energy mechanical milling. The compositions of the mixed powders are designed as Fe-18Cr-0.2Ti-0.35Y2O3 and Fe-18Cr-5Al-0.2Ti-0.35Y2O3 in weight percent. The asmilled powders were consolidated by hot extrusion at 1423 K. The dispersed oxide particles were identified to be titania ＋ yttria for Al-free oxide dispersion strengthened （ODS） steel and alumina ＋ yttria for Al-added ODS steel, respectively. The ultimate tensile strength of Al-free ODS steel was higher than that of Al-added ODS steel over the temperature range of 298-973 K, because of the difference in number density and size of thermally stable oxide particles dispersed in both steel matrices. The strength in the longitudinal direction was lower than that in the transverse direction, probably due to anisotropy of the microstructure with elongated grains in the hot-extrusion direction for the 18%Cr-ODS steels with and without 5% Al.

关键词： oxide dispersion strengthened (ODS) steel,milling extrusion aluminum yttria

Smooth cutting pattern generation technique for membrane structures using geodesic line on subplane and spline interpolation

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Journal of Central South University 2013年第11期20卷 3131-3141页

作者： SHON Su-deok lee Seung-jae lee Kang-guk School of Architectural Engineering Korea University of Technology and Education Research Center for Building safety Kyungpook National University

Practical techniques for smooth geodesic patterning of membrane structures were *** the geodesic search,adjustment of the subplane of the extracted elements series was proposed,and various spline approximation methods were used to flatten the strip for the generation of a smooth *** search approach is very simple,and the geodesic line could be easily attained by the proposed method without the need for a difficult computation *** cutting patterning can also be generated by spline approximation without the noise in discrete nodal ***,the geodesic cutting pattern saved about 21%of the required area for the catenary model due to the reduction of the curvature of the planar pattern seam line.

关键词： membrane structures cutting pattern generation geodesic line spline interpolation triangular mesh sub-plane

W-translated Schubert divisors and transversal intersections

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Science China Mathematics 2022年第10期65卷 1997-2018页

作者： DongSeon Hwang Hwayoung lee jae-Hyouk lee Changzheng Li Department of Mathematics Ajou UniversitySuwon 443-749Republic of Korea Department of Mathematics University of CaliforniaRiversideRiversideCA 92521USA Department of Mathematics Ewha Womans UniversitySeoul 120-750Republic of Korea School of Mathematics Sun Yat-sen UniversityGuangzhou 510275China

We study the toric degeneration of Weyl group translated Schubert divisors of a partial flag variety F?_(n1,...,nk;n) via Gelfand-Cetlin polytopes. We propose a conjecture that Schubert varieties of appropriate dimensions intersect transversally up to translation by Weyl group elements, and verify it in various cases,including the complex Grassmannian Gr(2, n) and the complete flag variety F?_(1,2,3;4).

关键词： W-translated Schubert varieties transversal intersection Gelfand-Cetlin polytope toric degeneration flag varieties

Improved Photoresponse of UV Photodetectors by the Incorporation of Plasmonic Nanoparticles on Ga N Through the Resonant Coupling of Localized Surface Plasmon Resonance

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Nano-Micro Letters 2020年第7期12卷 175-190页

作者： Sundar Kunwar Sanchaya Pandit jae-Hun Jeong Jihoon lee Department of Electronic Engineering College of Electronics and InformationKwangwoon University

Very small metallic nanostructures,i.e.,plasmonic nanoparticles(NPs),can demonstrate the localized surface plasmon resonance(LSPR)e ect,a characteristic of the strong light absorption,scattering and localized electromagnetic field via the collective oscillation of surface electrons upon on the excitation by the incident *** LSPR of plasmonic NPs can significantly improve the photoresponse of the *** this work,significantly enhanced photoresponse of UV photodetectors is demonstrated by the incorporation of various plasmonic NPs in the detector *** size and elemental composition of monometallic Ag and Au NPs,as well as bimetallic alloy Ag Au NPs,are fabricated on Ga N(0001)by the solid-state dewetting *** photoresponse of various NPs are tailored based on the geometric and elemental evolution of NPs,resulting in the highly enhanced photoresponsivity of 112 A W-1,detectivity of 2.4×1012 Jones and external quantum e ciency of 3.6×104%with the high Ag percentage of Ag Au alloy NPs at a low bias of 0.1 *** Ag Au alloy NP detector also demonstrates a fast photoresponse with the relatively short rise and fall time of less than 160 and 630 ms,*** improved photoresponse with the Ag Au alloy NPs is correlated with the simultaneous e ect of strong plasmon absorption and scattering,increased injection of hot electrons into the Ga N conduction band and reduced barrier height at the alloy NPs/Ga N interface.

关键词： UV photodetection NP-based photodetectors Nanoparticles Plasmonic enhancement