查询词典 newton method

But it is a hard task to solve this equation, one reason is that the TV-norm is nondifferentiable when |▽_u|= 0, so we cant apply a linearizationtechnique such as the Newton method. The other reason is that the Euler-Lagrange equation has a highly nonlinear term. The Newton method for such equation is known to have a very small domain of convergence, and it is very difficult to make sure that the initial value such as the observed image belongs to this domain. So the Newton method is not an ideal method for solving this equation.

但是求解它比较困难，主要是因为TV-范数在|▽u|=0处不可微，不能用诸如牛顿法之类的方法将其线性化；且Euler-Lagrange方程含有一个高度非线性的项，牛顿法只有局部收敛性，对于高度非线性问题它的收敛域很小，因此难以保证所取的初始点在它的收敛域内，故一般不用牛顿法直接求解。

In this paper,we study convergence theories of this inexact Newton method .

分析了求解对称特征值问题的不精确Newton法，给出了相应的收敛性定理，并证明了在适当的条件下，不精确Newton法超线性收敛。

An algorithm based on AD technique for the constrained optimization problems of device model parameter extraction is presented, which combines the modified Newton method with AD technique and uses the Rockafellar multiplier method to treat the constraint conditions.

提出了一个基于AD技术的有约束的器件模型参数提取算法，将AD技术与一种改进Newton法相融合，并利用Rockafellar的改进乘子法解决了约束条件的处理。

And it is proved to be more efficient than Newton method from the theorectical of view.

另一方面，将Newton-PCG算法应用于求解单和函数优化问题，利用单和函数优化问题的特殊性，进一步开发Newton-PCG技术建立了更有效的特殊算法。

At present, many effective iterations are all derived from Newton method.

Newton法是求解非线性方程的一个最基本而且十分重要的迭代方法，目前使用的很多有效的迭代法，都是以Newton法为基础，并由它而得到的。

One kind of Newton method which was suit for localized unstable problems was used in this algorithm.

求解时使用一种适合控制结构局部失稳的Newton法，并以带椭圆中心孔金属薄板的拉伸断裂为算例。

Especially the memoryless non-quasi-Newton method requires little storage and computation, so it is able to efficiently solve large scale optimization problems.

特别是无记忆非拟 Newton 算法，所需存储量及计算量较小，更适合求解大规模无约束优化问题。

A sufficient condition ensuring the Gauss-Newton method quadratically convergent exactly is given.

给出了保证Gauss-Newton法恰2阶收敛的条件，在此基础上构造了利用条件预优共轭梯度法求解Gauss-Newton方程的新的有效算法。

Simultaneously, the exports of ionization rate and nonionzed concentration are set up as a powerful tool for studying thoroughly the freeze-out effect. dN〓/dp and dN〓/dn are neglected in the linearized equation system of the iteration methods of Newton and Gummel, due to having lower 15 orders or more than dN〓/dn and dN〓/dp, thus the computing effort is cut down with no effect on precision. A new cut-off technique is adopted to accelerate the convergence speed, about twice reduced for Newton iteration method and six times or so for Gummel iteration method. The approximate formulae of Fermi-Dirac statistics are also put forward with simpler form and higher precision. 3. A term dependent on time is added to the electron and hole current succession equations respectively. It is only this model that conservation of charge in transient analysis and alternating small-signal analysis at low temperature can be kept by. 4. The performance of SE-PISCES is explained by the simulation example of PISCES-2B, diode.

研究了低温半导体器件模拟的数值方法：对载流子浓度进行了新的归一化；编制了不考虑掺杂所引进的内建电场时的电离率计算程序；由于低温杂质电离率随偏压状态而变化，为此编制了每次求解迭代时的电离浓度计算程序，并将其插入到求解迭代程序中；同时，设置了杂质电离率和未电离杂质浓度的出口点，为更深入地研究冻析效应提供了有力工具；在Newton迭代法和Gummel迭代法的线性化方程组中忽略了dN〓/dp、dN〓/dn，是因为它们比dN〓/dn、dN〓/dp低15个数量级以上，这样减小了计算量又不影响模拟精度；对Newton迭代法和Gummel迭代法采取了新的截断技术，提高了收敛速度，Newton法迭代法和两次左右，Gummel法减少六次左右；给出了表达式更简单而精度更高的Fermi-Dirac积分近似计算公式。

Second, as the first application of methods and theory, Regularization -Gauss-Newton Method and Widely Convergent Generalized Pulse Spectrum Technique are applied to inverse preblems of one and two dimensional wave equations in seismical prospecting.

其次，做为方法、理论的第一项应用内容，正则-Gauss-Newton法和大范围收敛广义脉冲谱方法在地震勘探一、二维波动方程反问题上进行了应用。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。