尺度函数的两个性质

Two properties are given in this paper about the scaling function: suppose Vj; j ∈ Z is a multiresolution analysis with a continuous scaling function φ which have compact support set and that φ the Fourier transform of φ is a continuous real function, compactly supported, then φ(0) ≠ 0 and when supp φ = [a1,b1]∪[a2,b2](b1 < a2,0 < a2), then we havea1 ≤ 0, 0 < b1, a1 < b2/2 ≤ b1, 2π < b2 - a1 ≤ 8π.     

Polyadic Concept Analysis

The framework and the basic results of Wille on triadic concept analysis, including his Basic Theorem of Triadic Concept Analysis, are here generalized to n-dimensional formal contexts.     

完全发展的非对称槽道湍流的标度指数研究

以子波变换为分析工具,研究了完全发展的非对称槽道湍流的局部标度指数和整体标度指数．其中整体标度指数通过正交子波和广义自相似定律得到,其结果表明非对称槽道流动呈现出与对称槽道流极为不同的间歇性,随着壁面距离的增大,横向脉动速度与流向脉动速度呈现出不同的间歇性,而且间歇性并非一直减弱．另外,比较分析了几种不同方法得到的局部标度指数,发现连续子波方法计算局部标度指数并不可靠,对于湍流研究中出现的负局部标度指数的情况需要慎重考虑．     

Additive Scaling and the DIRECT Algorithm

In this paper we show that the convergence behavior of the DIviding RECTangles (DIRECT) algorithm is sensitive to additive scaling of the objective function. We illustrate this problem with a computation and show how the algorithm can be modified to eliminate this sensitivity.     

一类尺度函数与小波的构造

利用卷积的定义及性质,构造出了一类尺度函数与小波,并通过算例加以说明.     

Multivariate Symmetric Interpolating Scaling Vectors with Duals

In this paper we introduce an algorithm for the construction of compactly supported interpolating scaling vectors on ℝ ^d with certain symmetry properties. In addition, we give an explicit construction method for corresponding symmetric dual scaling vectors and multiwavelets. As the main ingredients of our recipe we derive some implementable conditions for accuracy, symmetry, and biorthogonality of a scaling vector in terms of its mask. Our method is substantiated by several bivariate examples for quincunx and box-spline dilation matrices.      

L2(Rs)上尺度函数的研究

In this paper,using the orthonormal multiresolution analysis(MRA)of L~2(R~(?)), we get two important properties of the scaling function with dilation matrix A=MI of L~2(R~(?)).These properties are characterized by some inequalities and equalities.     

On the Galerkin Method Based on a Particular Class of Scaling Functions

The aim of this paper is to provide a large class of scaling functions for which the convergence analysis for the Galerkin method developed in [9] is applicable, whereas in that paper the only scaling functions considered for practical applications are B-splines and a few of the orthonormal Daubechies scaling functions. The functions considered here, were recently introduced in [12] where it was proved that they satisfy many properties making them interesting for the applications. In particular, here we show that the use of these functions has some advantages with respect to other basis functions.     

Scaling Properties of Flood Peaks

The scaling behavior of flood peak distributions is examined using a statistical model of the spatio-temporal distribution of rainfall and a hydrological model that describes the transformation of rainfall to discharge within a drainage network. Of particular interest is the empirical observation made by a number of investigators that the coefficient of variation (CV) of annual flood peaks for a region increases with drainage area up to drainage areas of approximately 100 km², and decreases with drainage area for larger drainage basins. This observation is neither consistent with simple scaling models, in which the coefficient of variation does not vary with drainage area, nor multiscaling models, in which the coefficient of variation decreases monotonically with drainage area. Model analyses illustrate that knowledge of the spatial and temporal organization of the rainfall, together with the details of the network structure of the drainage basin, is sufficient information with which to explain the observed behavior of sample CV. The interaction between the temporal variability of rainfall, relative to basin size, and the network structure is shown to be of particular importance.     

分数阶尺度函数的分解与重构算法

引入分数阶多分辨分析与分数阶尺度函数的概念.运用时频分析方法与分数阶小波变换,研究了分数阶正交小波的构造方法,得到分数阶正交小波存在的充要条件.给出分数阶尺度函数与小波的分解与重构算法,算法比经典的尺度函数与小波的分解与重构算法更具有一般性.     

数值分析课程教学改革的探索与实践

分析了当前数值分析课程教学存在的一些问题,结合多年的本科生和研究生的教学实践,给出了数值分析课程教学改革的具体措施,总结了改革的效果.     

A Unified Approach to Construct a Class of Daubechies Orthogonal Scaling Functions

We use Lorentz polynomials to give an efficient way to prove Daubechies’ results on the existence of spline type orthogonal scaling functions and to evaluate a class of Daubechies scaling functions in a unified approach.     

二元尺度函数的正交性

本文从非诱导的二维正交滤波的一类零点出发，构造紧集Ｋ，利用Ｃｏｈｅｎ准则，得到非诱导滤波对应的（Ａ，ｈ）尺度函数正交的一个充分条件，并构造二维正交滤波的例子说明其应用．     

自适应时间比例同步算法

本针对现有的时间比例同步算法具有时间比例固定、系统运行效率低、易导致系统中消息因果关系不正确的特点，运用模糊控制方法来动态调整系统运行的时间比例，设计了一种自适应时间比例同步算法，尽量减少仿真中不合理的现象，提高系统的运行效率。     

扰动方程的改进正则解及其数值分析

对滞右端扰动数据的第一类紧算子病态方程,文[2]给出了改进的Tokhonov正则化解法,本文以此为依据,对该解法举例进行例法分析。     

Scaling units via the canonical correlation analysis in the DEA context

This paper deals with the evaluation of decision making units which have multiple inputs and outputs. A new method (CCA/DEA) is developed where the Canonical Correlation Analysis (CCA) is utilized to provide a full rank scaling for all the units rather than a categorical classification (for efficient and inefficient units) as done by the Data Envelopment Analysis (DEA). The CCA/DEA approach is an attempt to bridge the gap between the frontier approach of DEA and the average tendencies of statistics (econometrics). Nonparametric statistical tests are employed to validate the consistency between the classification from the DEA and the postclassification that was generated by the CCA/DEA.     

偏微分方程的函数论方法及应用和计算

本文主要介绍了偏微分方程一些边值问题的函数论方法。首先给出了边值问题的适定提法；其次研究了多复变函数、Ｃｌｉｆｆｏｒｄ代数、某类抛物型方程、一些复合型方程组和双曲型方程组各种边值问题的可解性；进而使用一阶椭圆型方程组间断边值问题的结果，解决了渗流理论、空气动力学与弹性力学中提出的若干自由边界问题；最后还讨论了某些椭圆边值问题与拟共形映射的近似解法。从此文可以看出；函数论方法在处理偏微分方程的一些优     

非线性等式约束优化问题的仿射信赖域方法

提出非线性等式和有界约束优化问题的结合非单调技术的仿射信赖域方法. 结合信赖域方法和内点回代线搜索技术, 每一步迭代转到由一般信赖域子问题产生的回代步中且满足严格内点可行条件. 在合理的假设条件下, 证明了算法的整体收敛性和局部超线性收敛速率. 最后, 数值结果表明了所提供的算法具有有效性.