1,021 research outputs found
Guang-Ri Piao
No full text학위논문(박사)----아주대학교 일반대학원 :수학과,2007. 8List of Figures............................................................vii
List of Tables.............................................................x
Abstract.....................................................................0
Chapter 1. Introduction.................................................1
Chapter 2. Schematic Approach of CVT-based Model
Reduction for Simulation...............................5
2.1. Generating Snapshots......................................5
2.2. Generating Reduced Bases with CVT.................7
2.3. Using a Reduced Basis to Solve a Simulation
Problem..........................................................12
Chapter 3. Reduced-Order Distributed Feedback Control
of Burgers Equations Using CVT....................15
3.1. The Model Problem........................................ 15
3.2. Feedback Control Design.................................16
3.3. Reduced Order Compensators..........................21
3.4. Numerical Results...........................................23
Chaper 4. Reduced-Order-Based Boundary Feedback
Control of Burgers Equations Using CVT..........30
4.1. A Weighted CVT Algorithm for Generating
Reduced Order Basis.......................................30
4.2 CVT-based Model Reduction for
Burgers Equation..............................................33
4.3 Computational Experiments...............................48
4.4 Boundary Feedback Control for the Burgers
Equation..........................................................67
4.5 Numerical Computations and Results.................75
4.6 Conclusion......................................................81
Bibliography...............................................................83
국문요약.....................................................................89MasterRecently, CVT(centroidal Voronoi tessellation) is applied reduced order models for dynamical systems. In this thiesis, we have studied for distributed and boundary feedback control of Burgers equation with reduced order models based on CVT.
First, review of the CVT schematic approaches to reduced-order bases are provided. In CVT-reduced order modelling, we start with a snapshot set just as is done in a POD(proper orthogonal decomposition)-based setting.
Secondly, we develop the reduced-order feedback control for spatially distributed Burgers equation via CVT method. In this method, the density is taken to be uniform(constant) and we call this case as the ``CVT-uniform" algorithm.
Finally, we shall introduce a new algorithm of CVT as a procedure to determine the basis elements for the approximating subspaces. In the CVT new algorithm, the focus is choice of nonuniform (variable) density and we call this case as the ``CVT-nonuniform" algorithm. We describe some numerical experiments including comparison of CVT(CVT-uniform, CVT-nonuniform)-based algorithm with numerical results obtained from FEM(finite element method) and POD-based algorithm. We apply CVT-nonuniform-based reduced-order modelling technique to a boundary feedback control problem for Burgers equation
The Emigration of Koreans to Liao Dong during the Ming Dynasty
No full textLiao Dong was once a multiracial area during the Ming dynasty. One of the minority peoples were the Koreans who had lived there since the Yuan dynasty. The Goryeo dynasty on the Korean peninsula was replaced by the Choson dynasty, which created a stable tributary relationship with the Ming regime. But the phenomenon of emigration to Liao Dong continued. This article examines historical events related to Korean emigration as recorded in the Annals of the Choson Dynasty and orders them chronologically. It first analyzes the emigration and repatriation of the residents of the two countries involved in the tributary relationship, and then concludes that the flow of emigrants between Ming and Goryeo dynasty was usually bi-directional. After the tributary relationship had been established, especially after Emperor Yongle secured the empire in the Jingnan campaign, the rule of the Ming stabilized, there began a steady stream of Korean immigrants from Liao Dong back to Korea, creating the phenomenon of the flow of emigration from Korea to Liao Dong. Previous research, such as that by Yoshihiro Kawachi has proved the historical reality of the Korean emigration to Liao Dong during the Ming dynasty. However, the historical facts cited in such research mostly focus on what occurred during the era of King Seongjon of Choson. This article, instead, questions the implications of that research and clarifies that the upsurge of Korean emigration to Liao Dong was during the second half of the reign of Sejong the Great of Choson (1433-1450). The last part of the article focuses on the topic of Korean emigration to Liao Dong during the campaigns against Japanese invasion of Korea and the topic of immigrant repatriation, which have not previously been addressed. I use the Choson Yonhaengnok (Korean Envoys' Accounts of Missions to Beijing) and the information about the Korean dynasty as evidence to prove that the repatriation after the campaigns against Japanese invasion was not a drastically enforced and many Korean immigrants remained in Liao Dong. This research and dialectic of the topics form the basic foundation for analyzing the meaning of the frontier and the diplomatic relationship between China and Korea. It can be seen from this article that it is necessary to reevaluate the special status of the Liao Dong area in the history of the foreign relationship between China and Korea. In addition this kind of research focusing on history of the emigration between two countries in a tributary relationship, especially on the migration from the tributary to a the suzerain, provides a new point of view from whcih to understand the tributary relationship itself
Synthesis of a graphene–carbon nanotube composite and its electrochemical sensing of hydrogen peroxide
No full textGraphene, whose structure consists of a single layer of sp 2-hybridized carbon atoms, provides an excellent platform for designing composite nanomaterials. In this study, we have demonstrated a facile process to synthesize graphene-multiwalled carbon nanotube (MWCNT) composite. The graphene-MWCNT composite material is endowed with a large electrochemical surface area and fast electron transfer properties in Fe(CN) 6 3-/4- redox species. A graphene-MWCNT composite modified electrode exhibits good performance in terms of the electrocatalytic reduction of H 2O 2; a sensor constructed from such an electrode shows a good linear dependence on H 2O 2 concentration in the range of 2 × 10 -5 to 2.1 × 10 -3 mol L -1. The detection limit is estimated to be 9.4 × 10 -6 mol L -1. This study provides a new kind of composite modified electrode for electrochemical sensors. © 2011 Elsevier Ltd. All Rights Reserved.1
Three-dimensional carbon foam/N-doped graphene@MoS2 hybrid nanostructures as effective electrocatalysts for the hydrogen evolution reaction
No full textMolybdenum disulfide (MoS2)-based hybrid nanostructures have attracted much attention as promising alternatives to Pt-based electrocatalysts for the hydrogen evolution reaction. However, the catalytic performance of these nanostructures is limited by their poor conductivity and small surface area. Herein, using commercial threedimensional melamine foams (MFs) as the raw material, MoS2-coated macroporous carbon foam/N-doped graphene hybrid nanostructures (CF–NG@MoS2) were prepared through a combination of graphene oxide (GO) loading on the MF framework, high-temperature carbonization, and MoS2 growth. Owing to their unique structure, the asprepared
CF–NG@MoS2 hybrids exhibited enhanced catalytic performance for the HER. © The Royal Society of Chemistry 20162311sciescopu
Inhibitory activity of gold and silica nanospheres to vascular endothelial growth factor (VEGF)-mediated angiogenesis is determined by their sizes
No full textNanoparticles can be involved in biological activities such as apoptosis, angiogenesis, and oxidative stress by themselves. In particular, inorganic nanoparticles such as gold and silica nanoparticles are known to inhibit vascular endothelial growth factor (VEGF)-mediated pathological angiogenesis. In this study, we show that anti-angiogenic effect of inorganic nanospheres is determined by their sizes. We demonstrate that 20 nm size gold and silica nanospheres suppress VEGF-induced activation of VEGF receptor-2, in vitro angiogenesis, and in vivo pathological angiogenesis more efficiently than their 100 nm size counterparts. Our results suggest that modulation of the size of gold and silica nanospheres determines their inhibitory activity to VEGF-mediated angiogenesis.N
Hydrophobic Targeting Ligand Modified Polyethyleneimine for Hepatic Cancer Gene Therapy
No full text<p>Mingzhuo Cao <sup>1,2*</sup>, Yong Gao <sup>3</sup>, Mengling Zhan<sup>2</sup>, Nasha Qiu <sup>1</sup>, Ying Piao<sup>1</sup>, Zhuxian Zhou<sup>1</sup>, Youqing Shen <sup>1</sup></p>
<p><sup>1</sup> Center for Bio-nanoengineering and Key Laboratory of Biomass Chemical Engineering, Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;</p>
<p><sup>2</sup> Scientific Research and Experimental Center, Henan University of Chinese Medicine, Zhengzhou, 450058, China.</p>
<p><sup>3</sup> Henan province food and drug Administration, Food and Drug Evaluation and Inspection Center, Zhengzhou, 450018, China.</p>
<p><strong>*</strong> Corresponding Author: Mingzhuo Cao, E-mail: <a href="mailto:[email protected]">[email protected]</a></p>
Water requirement for biorefinery to meet the renewable fuel standard in the contiguous United States
No full textRenewable biofuel production requires a considerable amount of water for biofuel conversion. However, it is still unclear how much water is needed in the Contiguous United States (CONUS) to convert feedstocks to biofuels and the associated impacts on local water availabilities. This study addresses this issue with the most up-to-date data of feedstock, water availability, and water requirements for biorefinery technologies. The multi-faceted nature of biofuel development, including feedstock production, water availability, transportation cost, biorefinery capacity, and biorefinery benefits and costs, is addressed through the delineation of a basic analysis unit: biorefinery planning boundary (RPB). The result suggests the total biorefinery water use in 2030 accounts for less than 0.01% of the total water availability in the CONUS. However, local water issues are found, especially in the Great Plains RPBs where biorefinery would consume up to 100% of the local water availabilities. This high level of water consumption shows possible pressures on local water use, water infrastructure, and water price. If a constraint on water consumption is imposed for biorefineries, up to 1.2 billion Gallon/year cellulosic biofuel production (7.5% of the renewable fuel standard mandated amount) will be affected. The total affected cellulosic biofuel production correlates strongly with the water use constraint when the biomass price is higher than $50/dry ton (dt), but such correlation diminishes as the biomass price becomes lower. Findings from this study will be beneficial for the sustainable planning of biofuel production.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-08-01The student, Ximin Piao, accepted the attached license on 2021-07-08 at 15:42.The student, Ximin Piao, submitted this Thesis for approval on 2021-07-08 at 15:44.This Thesis was approved for publication on 2021-07-11 at 08:58.DSpace SAF Submission Ingestion Package generated from Vireo submission #16809 on 2022-01-12 at 13:04:13Made available in DSpace on 2022-01-12T22:55:00Z (GMT). No. of bitstreams: 2
PIAO-THESIS-2021.pdf: 5314653 bytes, checksum: ca90598f01eec2cd553e26b1b3f44c18 (MD5)
LICENSE.txt: 4207 bytes, checksum: 1ea8da51e2bc579971d1c9e6fade7adc (MD5)
Previous issue date: 2021-07-11Embargo set by: Seth Robbins for item 121214
Lift date: 2024-01-12T22:55:09Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 121214
Lift date: 2024-01-12T22:56:20Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemAuthor requested closed access (OA after 2yrs) in Vireo ETD systemLimite
Asymmetric dynamic behaviors of magnetic domain wall in trapezoid-cross-section nanostrip
No full textField-driven magnetic domain wall propagation in ferromagnetic nanostrips with trapezoidal cross section has been systematically investigated by means of micromagnetic simulation. Asymmetric dynamic behaviors of domain wall, depending on the propagation direction, were observed under an external magnetic field. When the domain walls propagate in the opposite direction along the long axis of the nanostrip, the Walker breakdown fields as well as the average velocities are different. The asymmetric landscape of demagnetization energies, which arises from the trapezoidal geometry, is the main origin of the asymmetric propagation behavior. Furthermore, a trapezoid-cross-section nanostrip will become a nanotube if it is rolled artificially along its long axis, and thus a two-dimensional transverse domain wall will become a three-dimensional one. Interestingly, it is found that the asymmetric behaviors observed in two-dimensional nanostrips with trapezoidal cross section are similar with some dynamic properties occurring in three-dimensional nanotubes. © 2020 Chinese Physical Society and IOP Publishing Ltd.1
Luan shi jia ren.
No full text王光鼐編劇.據美國密西爾的《飄》改編.Play.Wang Guangnai bian ju.Ju Meiguo Mixier de "Piao" gai bian
- …
