查询词典 approximating

Invariant manifolds are important for the study of dynamic systems. Since they are hard to he computed h analytical expression, the numerical method for approximating invariant manifold is an important mean.

不变流形在动力学研究的许多方面都有重要意义，由于不变流形很难通过解析表达式求解，对其做近似计算就成为重要的手段。

A method for improving the order of convergence by Richardson extrapolation for the Peaceman-Rachford scheme is also presented,which obtains the two order approximating accuracy.

提出一种修正的交替方向隐格式逼近均匀介质中的非连续渗流方程，以及修正Douglas格式逼近非均匀介质中的连续渗流方程。

The judging speed is accelerated To assure generating correct tool paths in 3-axis NC machining, the processing plans of undercut and overcut situations for whole tool trajectories are discussed Sometimes certain of complex problems can be simplified using an approximating surface offset strategy presented The surface reconstruction technology in reverse engineering is studied deeply.

讨论了三轴数控加工球头铣刀关于整个刀轨路径的漏切与过切的检查和处理方法，保证最终生成正确的刀具路径。研究了曲面偏距问题，提出了一种曲面近似偏距新策略，在保证正确结果的前提下，将复杂问题简单化。深入研究了逆向工程中散乱数据点的曲面重构技术。

The quadratic patches is fixed,and its parametric representation method is gained.The cubic patches reduce to three local factors through reducing Bernstein coefficients to control shape of curve,two of them are used to join segments into G2- continuity approximating curves for given sequence data in space,and the other is used to adjust shape of segment.

先固定二次曲面片，并得到其参数形式，然后约简三次曲面片所对应的Bernstein系数，使之为带有三个形状调整的形状因子，其中两个分别代表曲线段端点处的曲率，另外一个作为形状的调整。

One strategy of approximating fitness value is presented, which is to substitute the mean center with the Weber center, and so the fitness value is to minimize the sum of distances between all clients and their corresponding mean centers, and also author makes an experiment to verify the hypothesis that the Weber point is very near to the mean point in planar space.

分别采用了遗传算法和模拟退火算法进行两个多韦伯问题的实例研究。

A neural network is then used to represent the estimation of potentials,both the parameterized TD(0) learning formulas and algorithm are also derived for approximating the policy evaluation.By the approximation values of potentials and approximation policy iteration,a unified neuro-dynamic programming optimization approach is consequently proposed for both two criteria.

根据定义式，建立性能势在平均和折扣性能准则下统一的即时差分公式，并利用一个神经元网络来表示性能势的估计值，导出参数TD(0)学习公式和算法，进行逼近策略评估；然后，根据性能势的逼近值，通过逼近策略迭代来实现两种准则下统一的神经元动态规划(neuro-dynamic programming，NDP)优化方法。

In first part it pays attention to theory study. Afterwards, based on linear programming, we introduce some properties of conic optimization and its dual problem, which are a kind of especial convex programming. In second part, we apply these theories to practice, such as least-squares problems, polynomial solution and approximating covariance matrices, and other aspects .

第一部分是理论研究：在线性规划的基础上重点介绍了一种特殊的凸规划类型——锥规划及其对偶锥规划，并介绍了锥规划及其对偶锥规划的发展及其性质。

Based on the special decomposition of Hankel matrix, we can transform the problem of approximating a given matrix with a positive semidefinite real Hankel matrix of lower rank to a smooth unconstrained optimization problem.

对矩阵的低秩Hankel半正定矩阵逼近，采用特殊的分解形式，可将其转化为一个无约束的优化问题进行求解，本文应用拟牛顿方法求解无约束优化问题。

An iterative reasoning algorithm with time delay of CD is proposed in this paper to resolve time delay of complex system. It is an effective approximating reasoning algorithm for its polynomial time complexity. It realizes dynamic reasoning of causality diagram through multiplication of linkage strength matrix and probability vector when the CD has time delay.

本文针对复杂系统的时间延迟性提出了带时间延迟的因果图迭代推理算法，该算法可以在多项式时间复杂度内完成，是一种有效的近似推理算法。

The segmentation results are proper for quadric surface identification and NURBS approximating in reverse engineering.

该算法在大量的噪声网格模型上获得了较好的分割结果，适用于逆向工程中的二次曲面识别和NURBS曲面逼近。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。