逆计算

In the second chapter, elementary theories and ideas of one step forming inverse approach were described and warped modification method, implemented by Cook, was introduced into one step forming simulation and based on idea of surface spreading; new quadrilateral element modification arithmetic was put forward. By spreading warped quadrilateral onto plane in local coordinate system, a plane quadrilateral element whose shape and area were equal to original warped quadrilateral element was gotten and internal force vectors of four nodes and stiffness matrix of elements were improved to increase precision of simulations on this plane element.

第二章从一步成形逆有限元法的基本理论和思想出发，将Cook基于弹性理论的四边形单元的翘曲修正算法引入基于塑性的一步成形，并且基于曲面展开的思想，本文提出一种新的四节点单元翘曲修正方案，通过把翘曲的单元展开的方法在局部参考系中得到一个与实际翘曲单元的形状与面积非常接近的平面单元，在该平面单元中进行单元刚度及内力向量的计算，进一步改善模拟结果的精度。

Utilizing the real representation of quaternion matrices and its characters discusses the reversibility of quaternion matrices and a account way of athwart matrix in this article.

3，利用四元数矩阵的实表示及其性质讨论了四元数矩阵的可逆性以及逆矩阵的一种计算方法

The solution of backward and forward kinematics of flexible manipulator must be worked out while you develop a control system for the flexible manipulators.

本文介绍了一种应用双向映射神经元网络来实现柔性臂正、逆运动学计算的方法，利用神经网络输出的结果作为控制变量，来实现柔性臂运动学控制。

First, basing on point halving, this thesis proposed a new efficient algorithm of computing kP lQ on an elliptic curve over the finite field with characteristic 2 and analyzed the computational efficiency. When the ratio I/M of inversion to multiplication cost is small, this new algorithm is about 5%～30% faster than the traditional algorithms.

首先，基于半点运算给出一种计算特征为2的有限域上椭圆曲线双标量乘法kP lQ的新算法并分析了效率，当基域上求乘法与求逆的运算时间的比值比较小时，新算法的效率比已有算法提高5％～30％。

Based on the harmonic algorithm, the conductivity reconstruction method and the corresponding algorithm in oblique slice were proposed. Then the numerical simulation was performed by solving the Neumann boundary problem, Ohm's law and Biot-Savart law to obtain the magnetic flux density used to reconstruct the conductivity.

然后通过数值仿真来实现提出的算法，首先进行了正问题求解，即利用Neumann边界值问题、欧姆定律和毕奥－萨伐尔定律逐步计算出重建电导率分布的磁通密度的一个分量，接着进行了逆问题求解，即根据重建算法得到了横截面和斜位面内的相对电导率分布，并对仿真的结果进行了分析和讨论。

Utilizing the latitudinal mean ot upper meridional wind of 1950 given by Buch and Starr and White, mean meridional circulation has been studied.

本文利用了Buch和Starr与White所计算的1950年各纬度上空的平均经向风速，绘制了子午面上的平均环流(全年：图1，冬季：图2，夏季：图3)，图中显示出三个环型，低纬度和高纬度的两个正环型与中纬度的逆环型。

The paper describes the work process of chargeable switching power supply, control and main circuit of inverse change.

设计了本系统中所采用的充电器、控制器、逆变主电路，对电路的结构和有关参数进行了设计、计算。

Circulant matrices are often used as preconditioner for Toeplitz linear ...

循回矩阵通常用作Toeplitz线性系统的预处理矩阵，因为循回矩阵很容易求逆和有超快速的计算方法。

The technology of error compensation based on Multi-Body system and the design method of cam machining were combined together.

针对精密凸轮加工中存在的精度问题，推导出凸轮磨削中的理想砂轮中心包络线的求解方程，进而将基于多体系统理论的误差补偿技术与凸轮加工设计方法相结合，研究了理想数控指令的生成方法、砂轮轮廓误差的计算方法、精密数控指令和逆变凸轮廓型的求解算法，在此基础上，开发出凸轮精密磨削过程的误差补偿与动态仿真分析软件。

Simulations show that when the signal to noise ratio is greater than 0dB, the inverse model algorithm converges rapidly and stably with computational error being within a minimal bound.

仿真结果表明在信噪比大于0dB时，该自适应逆模型算法收敛迅速、稳定，计算误差保持在较小的范围之内。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新