中国科学院机构知识库网格系统: 检索

Truncated trust region method for nonlinear inverse problems and application in full-waveform inversion 期刊论文 OAI收割
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS, 2022, 卷号: 404, 页码: 17
作者: Yan, Xiaokuai; He, Qinglong; Wang, Yanfei

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Nonlinear inverse problems Trust region method Adjoint-state method Full-waveform inversion Regularization Matrix-free

An initial-boundary value problem for the general three-component nonlinear Schrodinger equations on a finite interval 期刊论文 OAI收割
IMA JOURNAL OF APPLIED MATHEMATICS, 2021, 卷号: 86, 期号: 3, 页码: 427-489
作者: Yan, Zhenya

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收藏 | 浏览/下载：37/0 | 提交时间：2021/10/26

general three-component nonlinear Schrodinger equations initial-boundary value problem inverse scattering Riemann-Hilbert problem global relation Dirichlet and Neumann problems Gel'fand-Levitan-Marchenko representation

A GAUSS-SEIDEL TYPE METHOD FOR DYNAMIC NONLINEAR COMPLEMENTARITY PROBLEMS 期刊论文 OAI收割
SIAM JOURNAL ON CONTROL AND OPTIMIZATION, 2020, 卷号: 58, 期号: 6, 页码: 3389-3412
作者: Wu, Shu-Lin; Zhou, Tao; Chen, Xiaojun

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收藏 | 浏览/下载：29/0 | 提交时间：2021/04/26

dynamic nonlinear complementarity problems iterative methods convergence analysis nonsmooth circuit systems projected dynamic systems

Laplace’s equation with concave and convex boundary nonlinearities on an exterior region 期刊论文 OAI收割
Boundary Value Problems, 2019, 卷号: 2019, 期号: 1
作者: Mao,Jinxiu; Zhao,Zengqin; Qian,Aixia

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收藏 | 浏览/下载：28/0 | 提交时间：2019/04/02

Exterior regions Laplace operator Concave and convex mixed nonlinear boundary conditions Fountain theorems Steklov eigenvalue problems 35J20 35J65 46E22 49R99

A Multiscale Algorithm for Heat Conduction-Radiation Problems in Porous Materials with Quasi-Periodic Structures 期刊论文 OAI收割
COMMUNICATIONS IN COMPUTATIONAL PHYSICS, 2018, 卷号: 24, 期号: 1, 页码: 204-233
作者: Yang, Zhiqiang; Sun, Yi; Cui, Junzhi; Li, Xiao

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收藏 | 浏览/下载：37/0 | 提交时间：2019/03/05

Multiscale asymptotic analysis radiation boundary condition quasi-periodic structures nonlinear heat transfer problems

A GENERAL TWO-LEVEL SUBSPACE METHOD FOR NONLINEAR OPTIMIZATION 期刊论文 OAI收割
JOURNAL OF COMPUTATIONAL MATHEMATICS, 2018, 卷号: 36, 期号: 6, 页码: 881-902
作者: Chen, Chong; Wen, Zaiwen; Yuan, Yaxiang

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收藏 | 浏览/下载：34/0 | 提交时间：2019/03/05

Nonlinear optimization Convex and nonconvex problems Subspace technique Multigrid/multilevel method Large-scale problems

Stability of transonic shocks in steady supersonic flow past multidimensional wedges 期刊论文 OAI收割
ADVANCES IN MATHEMATICS, 2017, 卷号: 314, 页码: 493-539
作者: Chen, Gui-Qiang; Fang, Beixiang

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收藏 | 浏览/下载：34/0 | 提交时间：2018/07/30

Stability Multidimensional M-D Transonic shocks Steady Supersonic Wedge Nonlinear approach Iteration scheme A priori estimates Boundary value problems Weighted norms Instability Asymptotic behavior

Second-Order Two-Scale Computational Method for Nonlinear Dynamic Thermo-Mechanical Problems of Composites with Cylindrical Periodicity 期刊论文 OAI收割
COMMUNICATIONS IN COMPUTATIONAL PHYSICS, 2017, 卷号: 21, 期号: 4, 页码: 1173-1206
作者: Dong, Hao; Cui, Junzhi; Nie, Yufeng; Yang, Zihao

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收藏 | 浏览/下载：29/0 | 提交时间：2018/07/30

Second-order two-scale nonlinear dynamic thermo-mechanical problems temperature-dependent properties cylindrical periodicity

A strong coupled CFD-CSD method on computational aeroelastity (EI CONFERENCE) 会议论文 OAI收割
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011, July 15, 2011 - July 17, 2011, Inner Mongolia, China
Xi R.; Jia H.

收藏 | 浏览/下载：72/0 | 提交时间：2013/03/25

In this paper a strong coupled CFD-CSD method is developed to simulate the aeroelastic phenomena. The CFD solver is based on the finite-volume algorithm for the Navier-Stokes equations on unstructured grid. The CSD solver solves the aeroelastic governing equations in the modal space. Their coupling is realized by a dual-time method. The spring-based smoothing method is adopted to deform and regenerate the aerodynamic grid. Two test cases are selected to validate the authors' method for static and dynamic aeroelastity .The results of the simulation for the static aeroelastic problems of a missile wing show that the Lift Coefficient and Drag Coefficient are severally 7% and 5% lower than those don't consider the elasticity of the wing. The results for the flutter boundary prediction of the AGARD 445.6 wing have been proved much closer to the experiment than using the DLM. This method can describe the effects of fluid viscosity more exactly for highly nonlinear transonic flight conditions. The calculation has proved reliable in the subsonic regime but not accurate enough in the supersonic regime. 2011 IEEE.

The new approach for infrared target tracking based on the particle filter algorithm (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Sun H.; Han H.-X.; Sun H.

收藏 | 浏览/下载：63/0 | 提交时间：2013/03/25

Target tracking on the complex background in the infrared image sequence is hot research field. It provides the important basis in some fields such as video monitoring precision and video compression human-computer interaction. As a typical algorithms in the target tracking framework based on filtering and data connection the particle filter with non-parameter estimation characteristic have ability to deal with nonlinear and non-Gaussian problems so it were widely used. There are various forms of density in the particle filter algorithm to make it valid when target occlusion occurred or recover tracking back from failure in track procedure but in order to capture the change of the state space it need a certain amount of particles to ensure samples is enough and this number will increase in accompany with dimension and increase exponentially this led to the increased amount of calculation is presented. In this paper particle filter algorithm and the Mean shift will be combined. Aiming at deficiencies of the classic mean shift Tracking algorithm easily trapped into local minima and Unable to get global optimal under the complex background. From these two perspectives that "adaptive multiple information fusion" and "with particle filter framework combining" we expand the classic Mean Shift tracking framework.Based on the previous perspective we proposed an improved Mean Shift infrared target tracking algorithm based on multiple information fusion. In the analysis of the infrared characteristics of target basis Algorithm firstly extracted target gray and edge character and Proposed to guide the above two characteristics by the moving of the target information thus we can get new sports guide grayscale characteristics and motion guide border feature. Then proposes a new adaptive fusion mechanism used these two new information adaptive to integrate into the Mean Shift tracking framework. Finally we designed a kind of automatic target model updating strategy to further improve tracking performance. Experimental results show that this algorithm can compensate shortcoming of the particle filter has too much computation and can effectively overcome the fault that mean shift is easy to fall into local extreme value instead of global maximum value.Last because of the gray and fusion target motion information this approach also inhibit interference from the background ultimately improve the stability and the real-time of the target track. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).