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1.
基于区间数的应急物资储备库最小费用选址模型   总被引:6,自引:0,他引:6  
本文研究了基于区间数的应急物资储备库最小费用选址问题。给出了区间数的概念和运算,构建了参数为区间数的应急物资储备库最小费用选址模型,提出了求模型满意解的算法,最后通过算例分析说明该方法的有效性。  相似文献
2.
我国上市公司首次披露股权激励计划的市场反应分析   总被引:3,自引:0,他引:3  
本文首次以《上市公司股权激励管理办法》颁布以来沪深两市首次披露股权激励计划的上市公司作为研究对象,运用事件研究法计算超额收益的方式,检验了股权激励计划披露前后超额收益率的变动情况.研究发现,在股权激励计划披露后,证券市场有显著的正面反应;在股权激励计划披露前34天的短时窗内证券市场有不显著的正面反应,在披露前60天到90天的长时窗内,证券市场有负面反应.  相似文献
3.
熵损失函数下几何分布可靠度的Bayes估计   总被引:3,自引:0,他引:3  
本文在几何分布的先验分布为幂分布时研究了其在熵损失函数下,可靠度的多层Bayes估计及其容许性,给出了可靠度的多层Bayes估计的计算公式.通过实例验证,在熵损失函数下计算出的几何分布可靠度的多层Bayes估计是稳健的,并进一步表明在熵损失函数下计算出的几何分布可靠度的多层Bayes估计值比其在平方损失函数下算出的结果精度更高.  相似文献
4.
多因素指派模型全局优化问题研究   总被引:1,自引:0,他引:1  
基于多因素资源优化分配问题的不确定性,建立基于区间数型下的不确定多因素指派模型,给出模型建立的理论依据与全局优化算法,拓展区间数型多因素指派模型,解决了不确定条件下多因素资源优化分配问题.考虑多因素影响,基于任务完成效率,以5类任务多因素分配问题为例,获得了指派模型全局优化的解.为不确定条件下资源优化分配问题的研究拓宽了决策途径.  相似文献
5.
In this paper, the convergence analysis of the Volterra integral equation of second kind with weakly singular kernel and pantograph delays is provided. We use some function transformations and variable transformations to change the equation into a new Volterra integral equation with pantograph delays defined on the interval [?1, 1], so that the Jacobi orthogonal polynomial theory can be applied conveniently. We provide a rigorous error analysis for the proposed method in the L -norm and the weighted L 2-norm. Numerical examples are presented to complement the theoretical convergence results.  相似文献
6.
We introduce a weak Galerkin finite element method for the valuation of American options governed by the Black-Scholes equation. In order to implement, we need to solve the optimal exercise boundary and then introduce an artificial boundary to make the computational domain bounded. For the optimal exercise boundary, which satisfies a nonlinear Volterra integral equation, it is resolved by a higher-order collocation method based on graded meshes. With the computed optimal exercise boundary, the front-fixing technique is employed to transform the free boundary problem to a one- dimensional parabolic problem in a half infinite area. For the other spatial domain boundary, a perfectly matched layer is used to truncate the unbounded domain and carry out the computation. Finally, the resulting initial-boundary value problems are solved by weak Galerkin finite element method, and numerical examples are provided to illustrate the efficiency of the method.  相似文献
7.
A second-order scheme for the Gray–Scott (GS) model used to describe the pattern formation is studied. The linear part of the GS equation for the time derivative and the viscous terms is discretized implicitly, while the other (or nonlinear) part of the GS equation explicitly. Galerkin finite element approximation methods are presented and analyzed, as well as methods for solving the resulting system of equations. The optimal L2L2-norm error estimates are derived. Numerical experiments are presented.  相似文献
8.
In this paper, we address the finite element method and discontinuous Galerkin method for the stochastic scattering problem of Helmholtz type in ℝ d (d = 2, 3). Convergence analysis and error estimates are presented for the numerical solutions. The effects of the noises on the accuracy of the approximations are illustrated. Results of the numerical experiments are provided to examine our theoretical results. The first author is supported by NSF under grand number 0609918 and AFOSR under grant numbers FA9550-06-1-0234 and FA9550-07-1-0154, the second author is supported by NSFC(10671082, 10626026, 10471054), and the third author is supported by NNSF (No. 10701039 of China) and 985 program of Jilin University.  相似文献
9.
In this paper, we consider the finite element method and discontinuous Galerkin method for the stochastic Helmholtz equation in R^d (d = 2, 3). Convergence analysis and error estimates are presented for the numerical solutions. The effects of the noises on the accuracy of the approximations are illustrated. Numerical experiments are carried out to verify our theoretical results.  相似文献
10.
Let f(z) be a finite order meromorphic function and let cC {0} be a constant. If f(z) has a Borel exceptional value aC, it is proved that
$$\max \left\{ {\tau \left( {f\left( z \right)} \right),\tau \left( {{\Delta _c}f\left( z \right)} \right)} \right\} = \max \left\{ {\tau \left( {f\left( z \right)} \right),\tau \left( {f\left( {z + c} \right)} \right)} \right\} = \max \left\{ {\tau \left( {{\Delta _c}f\left( z \right)} \right),\tau \left( {f\left( {z + c} \right)} \right)} \right\} = \sigma \left( {f\left( z \right)} \right)$$
If f(z) has a Borel exceptional value b ∈ (C {0}) ∪ {∞}, it is proved that
$$\max \left\{ {\tau \left( {f\left( z \right)} \right),\tau \left( {\frac{{{\Delta _c}f\left( z \right)}}{{f\left( z \right)}}} \right)} \right\} = \max \left\{ {\tau \left( {\frac{{{\Delta _c}f\left( z \right)}}{{f\left( z \right)}}} \right),\tau \left( {f\left( {z + c} \right)} \right)} \right\} = \sigma \left( {f\left( z \right)} \right)$$
unless f(z) takes a special form. Here τ (g(z)) denotes the exponent of convergence of fixed points of the meromorphic function g(z), and σ(g(z)) denotes the order of growth of g(z).
  相似文献
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