参数变换

In Chapter six, the estimation method of LMSV model based on wavelet transformation is studied.

第七章研究基于小波变换的时变LMSV模型参数的估计方法。

In order to correct the head motion in images.it was tried to find out some transformation parameters by calculating the minimum standard deviation between the reference image and the image being corrected.

本研究通过计算参考图像与被校图像之间残差平方和的极值找到移动变换参数，对手指运动磁共振脑功能成像中的头部移动进行校正

In this paper, Newton iteration formula for computing normal depth and critical depth was put forward by mathematical transformation of uniform flow equation and critical flow equation of circular section tunnel. Then, the relationship between the corresponding central angle and the introduced parameters was analyzed. An approximate formula for angle was obtained according to optimal uniform approximation principle. Using this approximate formula as initial value of iteration formula, a direct formula for calculating normal depth and critical depth of circular section tunnel was established after its first iterative.

该文通过对圆形断面均匀流方程与临界流方程的数学变换，分别得到其正常水深与临界水深的牛顿迭代公式，同时，通过对正常水深与临界水深对应的中心角与引入参数之间关系的分析及数值计算，利用最优一致逼近原理分别得到了正常水深与临界水深对应中心角的近似计算式，并以此近似计算式为初值，用迭代方程进行一次迭代得到了圆形断面均匀流水深与临界流水深的直接计算公式。

Information processing technology ; heart rate variability ; 1/f noise ; spectral parameter ; orthogonal wavelets ; least square algorithm

信息处理技术；心律波动信号； 1/f噪声；谱参数；正交小波变换；最小二乘准则

These efforts help to disassemble the complex task of the ship structure knowledge system into some relatively simple sub-tasks, and to found the parameter representation method for concerned knowledge in the knowledge base of structure design.

船体结构布置和计算纷繁复杂，本文通过对大中型集装箱船的结构模块化分析和计算，给出了大中型集装箱船系列化的主尺度变换原则、结构模块的划分方法以及结构标准件和可变件划分计算方法，为集装箱船中剖面结构设计知识系统的任务分解以及结构设计知识库中的有关知识的参数化标准模块表示打下了基础。

But the traditional circle Hough transform needs 3-dimension parameter space, so the process of the computing costs a lot of time and very large computer memory.

但传统的圆Hough变换的需要， 3维参数空间，所以过程中的计算成本了大量的时间和非常大的电脑记忆体。

Based on the assumptions of semi logarithmic relationship between coefficient of permeability and void ratio as well as the relationship between effective stress and void ratio of soil, the method of Lie Group Transformation is applied to solve the non linear partial differential equation of large strain consolidation of homogeneous saturated clay in semi infinite domain.

基于有效应力与孔隙比以及渗透参数与孔隙比之间的关系的一些假定，采用李群变换求解考虑材料非线性和几何非线性的半无限均质土体大变形固结非线性偏微分方程，得到了一个不考虑自重固结的完全解析解。

This paper analysized the relationship between sampling frequency fs and the taps N of low pass filter in A/D transform and got a formula expression, which can give reference to the parameter design of quadrature sampling.; aiming at the wave distortion in traditional arithmetic of quadrature sampling with pulse compression, an improved algorithm has been studied and validated in Matlab and get perfecter result. In order to enlarge the detect distance of Radar, a method of part pulse compression is put forward, the realistic sense and the implement scheme is analysized.

本文分析了在正交插值前端A/D变换中采样率的选择与正交插值低通滤波器的阶数的关系，得到公式化的表达式，可为正交采样参数设计提供参考；针对传统的正交插值及脉冲压缩算法中的波形畸变提出了改进方案，并通过仿真实验得到较好的效果；为扩大雷达的探测距离，提出部分脉压的方案，详细分析了其理论意义及实现方法。

Then according to the characteristic of LFMCW fuze signal,the characteristic parameter is extracted based on periodic ambiguity function.

该方法首先对侦察接收到的信号作二维自相关变换，分析LFMCW引信信号的周期模糊函数特征，然后结合LFMCW引信信号本身的特性，在相关域提取LFMCW引信信号的特征参数。

Simulation results show that the chaotic system can be controlled effectively in Buck power converter by this method. The method is still effective when there are parameter perturbation and noise.

数值仿真结果表明：该方法能有效地实现Buck功率变换器混沌系统的控制，系统在参数发生摄动和存在噪声的情况下，控制仍然有效。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。