查询词典 hessian matrix

That means to calculate the Hessian matrix of optical flow equation, and the weight of Lucas-Kanade＇s method is defined as the reciprocal of the conditioning number of its Hessian matrix.

然后借用灰度直方图的概念构造方向直方图，提取光流特征，方向直方图由量化光流场来得到，再利用方向直方图构造出一个模板库及其索引序列库。

The dissertation focuses on performance gradient estimation and SRO algorithm of DES aswell as other related topics,such as modeling of DES and discrete event simulation,performancemeasure Hessian matrix estimation,Stochastic Approximationand so on.General Semi-Markov Processis adapted to describe behaviour of DES and discrete eventsimulation.A general result is obtained and applied to analyze strong consistency of performancegradient Perturbation Analysisestimator.Conditions for effectiveness of InfinitesimalPerturbation Analysisare also discussed.New PA algorithms,such as server PA,PA usingDirac generalized function,job sequence PA etc.,are proposed to deal with discreteparameters.Furthermore,strategies of combining PA algorithms with certain iterative rules areanalyzed widely in order to optimize DES parameters and some SRO algorithms are constructed toslove DES optimization problems.

论文将DES性能分析领域中性能梯度估计和单运行仿真优化作为主要的研究对象，探讨了与性能梯度估计有关的DES和离散事件仿真过程建模、高阶导数估计以及随机逼近等理论和方法；建立了具有一般性的DES和离散事件仿真的广义半Markov过程模型；获得了分析性能梯度估计量强相合性的理论结果和无穷小摄动分析算法应用的条件；提出了诸如服务台数目的摄动分析、奇异摄动分析、串联生产线和加工车间中工件加工序的摄动分析等一系列摄动的思想和算法，对连续参数和离散参数都进行了深入的研究；对摄动分析算法同优化规则结合实现仿真优化的策略也进行了广泛的分析，构造了新型的变界截尾的随机逼近算法，并用于DES的单运行仿真优化研究；最后，给出了DES性能分析方法的实证性研究结果。

And introducing Levenberg-Marquardt method to perturb the Hessian matrix is also quite unique and successful.

大量的实验结果也证实了我们两种方法的有效性。

To deal with large problems, a two-piece up-date of two-side-reduced Hessian is used to replace the full Hessian matrix.

一般采用二块校正的双边既约Hesse阵方法代替完全Hesse阵方法处理大规模问题。

Combining the characteristics of Hessian matrix eigenvectors and the geometry direction of fingerprint, the proposed algorithm tracked the ridges of fingerprint and extracted minutiae accurately.

该算法结合Hessian矩阵的特征向量和指纹纹线本身的几何方向的特点，提取跟踪曲线的细节点。

Further, according to the positity of the Hessian matrix, which is got from the second order adjoint model, the uniqueness of the assimilation result is manifest. And the relationship between the rate of convergence and the frequency of the observation utilization in the assimilation is investigated.

进一步，借助二阶伴随模式所得到的Hessian矩阵，说明同化解是唯一的，并分析了优化算法的收敛速度与同化过程中观测资料使用频率的关系。

It is shown that the Hessian matrix and the density of states can be obtained reasonably using the equivalent Coulomb potential in the form of the complementary error function.

计算实践表明，取用余误差函数形式的等效库仑势，可以合理地得到Hessian矩阵和态密度。

Modifications to the conventional layer by layer optimization method make it possible to avoid computing Hessian Matrix and its inverse form, thus it can decrease computational complexity dramatically. Simulation results for some practical problems such as function approximation and XOR problem, have demonstrated improvements over classical back-propagation algorithm and conventional layer by layer optimization algorithm.

本文在传统逐层优化算法上的改进避免了反复计算 Hessian 矩阵及其逆矩阵，因而可以减少计算量，对一些应用问题，如函数逼近、异或等问题的仿真实验证实了新的算法比经典的 BP 算法以及现存的逐层优化算法的训练速度更快、可靠性更好。

Above all by hand in dc network to the coupling between concerns and be changed stream implement changeover equation, derivation gives rectangular coordinates to fasten matrix of the Jacobi that makes dc system, Hessian, the means that offers section to seek solution in the light of the change that makes dc system control fashion next begs solution voltage to stabilize the usable transmission ability below tie condition.

首先由交直流网络间的耦合关系和换流器转换方程，推导出直角坐标系交直流系统的Jacobi、Hessian矩阵，然后针对交直流系统控制方式的改变提出分段求解的方法求解电压稳定约束条件下的可用传输能力。

The calculation of controlling unstable equilibrium point of a post fault power system is transformed to nonlinear least squares issue. The Jacobi matrix, Hessian matrix and the residue formula are derived. It is found that the residue is changed in the calculating process, so it is appropriate to use the switch method to solve the problem.

将计算电力系统故障后的主导不稳定平衡点的问题转化为最小二乘问题，推导了计算所需要的雅可比矩阵、海山阵以及计算过程的残量公式，发现残量随著计算过程而变化，因此该问题适合于采用开关算法。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了