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排序方式: 共有202条查询结果,搜索用时 578 毫秒
91.
H. O. Fattorini 《数学物理学报(B辑英文版)》2011,31(6):2203-2218
We present in this paper a survey of recent results on the relation between time and norm optimality for linear systems and the infinite dimensional version of Pontryagin’s maximum principle. In particular, we discuss optimality (or nonoptimality) of singular controls satisfying the maximum principle and smoothness of the costate in function of smoothness of the target. 相似文献
92.
Yi-ping Xu 《应用数学学报(英文版)》2012,28(4):721-730
We propose a new algorithm for the total variation based on image denoising problem. The split Bregman method is used to convert an unconstrained minimization denoising problem to a linear system in the outer iteration. An algebraic multi-grid method is applied to solve the linear system in the inner iteration. Furthermore, Krylov subspace acceleration is adopted to improve convergence in the outer iteration. Numerical experiments demonstrate that this algorithm is efficient even for images with large signal-to-noise ratio. 相似文献
93.
何承源 《高等学校计算数学学报》2005,27(2):169-177
In this paper., some necessary and sufficient conditions for solving the inverse problem of linear equation system Ax = b taken both on r-circulating and symmetric r-circulating systems are given, furthermore a criterion for decision whether there exists a solution as well a fast algorithm for it and its implementation on computer are given too. 相似文献
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96.
Zhanwen Li Guiding Gu 《高等学校计算数学学报(英文版)》2006,15(1):40-49
The restarted FOM method presented by Simoncini[7]according to the natural collinearity of all residuals is an efficient method for solving shifted systems,which generates the same Krylov subspace when the shifts are handled simultaneously.However,restarting slows down the convergence.We present a practical method for solving the shifted systems by adding some Ritz vectors into the Krylov subspace to form an augmented Krylov subspace. Numerical experiments illustrate that the augmented FOM approach(restarted version)can converge more quickly than the restarted FOM method. 相似文献
97.
迭代学习控制的高阶最优学习律 总被引:1,自引:0,他引:1
方学毅 《浙江大学学报(理学版)》2005,32(2):160-164
最优迭代学习控制是学习控制中的一个重要研究方向.对高阶最优学习律的研究具有重要意义.该文根据最优化的必要性条件给出关于离散时间线性系统迭代学习控制的高阶最优学习律,证明了该学习律的收敛性.最后给出了仿真实例. 相似文献
98.
XuanyunQin WeipingFeng 《数学理论与应用》2002,22(2):31-33
In this paper,employing the geometric criteria of stabilty we obtain some stable results of linear differential equations with impulsive effects. 相似文献
99.
In this paper, we provide a separation theorem for the singular linear quadratic (LQ) control problem of Itô-type linear systems in the case of the state being partially observable. Above all, the Kalman-Bucy filtering of the dynamics is given by means of Girsanov transformation, by which the suboptimal feedback control of the LQ problem is determined. Furthermore, it is shown that the well-posedness of the LQ problem is equivalent to the solvability of a generalized differential Riccati equation (GDRE). 相似文献
100.