共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
分了平面蜂窝区域的结构与避免射频干扰的给定规则之间的关系,找到了适应给定规则的基模块,把射频信道的最优分配问题转化为基模块的最优分配问题和基模块的适当平移问题,由之给出了平面上任何蜂窝区域射频信道的分配方案,并证明了所给方案的最优性,求得满足给定规则簇的分配方案所使用最大频率的最小值span作为给定规则簇中信道代号变量k的函数表达式为 相似文献
4.
5.
6.
在中国,决策者常常须在满足一定的均衡条件下从许多替代方案中选出一个最佳方案。本文提出了一个整数规划模型来描述这类问题,同时也给出了该模型的算法. 相似文献
7.
打车软件平台增加了乘客与出租车司机之间的信息透明度,促进了供求匹配,在一定程度上缓解了“打车难”的问题。从另一个角度,出租车司机获得了乘客的需求信息后,可能出现“挑单”的现象,一些低收益的订单将会难以被接。本文基于深圳市的实际数据,分析了深圳市的出租车供求关系时空分布,并探讨了已有补贴方案对出租车资源配置的影响,之后给出了更合理的补贴方案的设计模型,并通过仿真说明方案的可行性。从某种程度上,能够通过经济手段实现出租车资源的优化配置,最大程度上有效缓解“打车难”的问题。 相似文献
8.
9.
10.
本文对有限元和直接积分法瞬态动力计算的时空离散协调问题进行了研究,本文分别分析了空间离散和时间离散所引起的数值误差,提出了均衡空间离散引起的能量误差和时间离散引起的能量误差的原则,并给出时空离散协调的前处理方案和自适应方案。 相似文献
11.
In the paper, a two-grid discretization scheme is discussed for the Steklov eigenvalue problem. With the scheme, the solution of the Steklov eigenvalue problem on a fine grid is reduced to the solution of the Steklov eigenvalue problem on a much coarser grid and the solution of a linear algebraic system on the fine grid. Using spectral approximation theory, it is shown theoretically that the two-scale scheme is efficient and the approximate solution obtained by the scheme maintains the asymptotically optimal accuracy. Finally, numerical experiments are carried out to confirm the considered theory. 相似文献
12.
对于守恒型扩散方程,研究其二阶时间精度非线性全隐有限差分离散格式的性质,证明了其解的存在唯一性.研究了二阶时间精度的Picard-Newton迭代格式,证明了迭代解对原问题真解的二阶时间和空间收敛性,以及对非线性离散解的二次收敛速度,实现了非线性问题的快速求解.本文中方法也适用于一阶时间精度格式的分析,并可推广至对流扩散问题.数值实验验证了二阶时间精度Picard-Newton迭代格式的高精度和高效率. 相似文献
13.
二维非线性椭圆型奇异摄动边值问题差分格式 总被引:1,自引:0,他引:1
二维非线性椭圆型奇异摄动边值问题差分格式刘国庆(南京化工学院)DIFFERENCESCHEMEFORTWO-DIMENSIONNONLINEARELLIPTICSINGULARLYPERTURBEDBOUNDARYVALUEPROBLEM¥LiuGu... 相似文献
14.
Charyyar Ashyralyyev 《Mathematical Methods in the Applied Sciences》2020,43(8):5369-5379
In this paper, we study the approximation of reverse parabolic problem with integral boundary condition. The Rothe difference scheme for an approximate solution of reverse problem is discussed. We establish stability and coercive stability estimates for the solution of the Rothe difference scheme. In sequel, we investigate the first order of accuracy difference scheme for approximation of boundary value problem for multidimensional reverse parabolic equation and obtain stability estimates for its solution. Finally, we give numerical results together with an explanation on the realization in one- and two-dimensional test examples. 相似文献
15.
Charyyar Ashyralyyev 《Mathematical Methods in the Applied Sciences》2023,46(2):2488-2499
Approximation of source identification problem for elliptic equation with integral-type nonlocal condition is discussed. The first order of accuracy difference scheme for elliptic nonlocal identification problem is studied. By using spectral resolution of a self-adjoint operator, we establish stability inequalities for solution of constructed scheme. Subsequently, the difference scheme for approximate solution of multidimensional boundary value problem with integral-type nonlocal and first kind boundary conditions is investigated on stability. Numerical test examples are presented. 相似文献
16.
A two-grid discretization scheme for eigenvalue problems 总被引:11,自引:0,他引:11
A two-grid discretization scheme is proposed for solving eigenvalue problems, including both partial differential equations and integral equations. With this new scheme, the solution of an eigenvalue problem on a fine grid is reduced to the solution of an eigenvalue problem on a much coarser grid, and the solution of a linear algebraic system on the fine grid and the resulting solution still maintains an asymptotically optimal accuracy.
17.
《数学物理学报(B辑英文版)》2016,(1)
In this paper, the Crank-Nicolson/Newton scheme for solving numerically secondorder nonlinear parabolic problem is proposed. The standard Galerkin finite element method based on P2 conforming elements is used to the spatial discretization of the problem and the Crank-Nicolson/Newton scheme is applied to the time discretization of the resulted finite element equations. Moreover, assuming the appropriate regularity of the exact solution and the finite element solution, we obtain optimal error estimates of the fully discrete CrankNicolson/Newton scheme of nonlinear parabolic problem. Finally, numerical experiments are presented to show the efficient performance of the proposed scheme. 相似文献
18.
A regularized optimization problem for computing numerical differentiation for the second order derivatives of functions with two variables from noisy values at scattered points is discussed in this article. We prove the existence and uniqueness of the solution to this problem, provide a constructive scheme for the solution which is based on bi-harmonic Green's function and give a convergence estimate of the regularized solution to the exact solution for the problem under a simple choice of regularization parameter. The efficiency of the constructive scheme is shown by some numerical examples. 相似文献
19.
本文考察了椭圆一双曲型偏微分方程奇异摄动问题(1.1),证明了迎风差分格式在一特殊的非均匀网格上是一阶一致收敛的.最后给出了一些数值结果. 相似文献
20.
A. A. Lazarev R. R. Sadykov S. V. Sevastyanov 《Journal of Applied and Industrial Mathematics》2007,1(4):468-480
The strongly NP-hard scheduling problem of minimizing the maximum lateness on one machine subject to job release dates is under study. We present a general scheme of approximation solution of the problem which is based on searching for a given problem instance another instance, closest to the original in some metric and belonging to a known polynomially solvable class of instances. For a few concrete variants of the scheme (using different polynomially solvable classes of instances) some analytic formulas are found that make it possible, given a problem instance, to compute easily an upper bound on the absolute error of the solution obtained by a chosen scheme. 相似文献