检索结果-内蒙古大学图书馆

direct algorithm for computation of derivatives of the Daubechies basis functions

APPLIED MATHEMATICS AND COMPUTATION 2005年第2期170卷 1006-1013页

作者： Lin, WB Kovvali, N Carin, L Duke Univ Dept Elect & Comp Engn Durham NC 27708 USA

We extend the direct algorithm for computing the derivatives of the compactly supported Daubechies N-vanishing-moment basis functions. The method yields exact values at dyadic rationals for the nth derivative (0 <= n <= N - 1) of the basis functions, when it exists. Example results are shown for the first derivatives of the basis functions from the Daubechies N-vanishing-moment extremal phase orthonormal family (for N = 3,4, and 5), and the CDF(2, N) spline-based biorthogonal family (for N = 6,8 and 10). (c) 2005 Elsevier Inc. All rights reserved.

关键词： wavelets derivatives Daubechies basis functions cascade algorithm direct algorithm

来源：评论

学校读者我要写书评

暂无评论

An efficient global optimization algorithm for multifactor dynamic systems

引用

JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS 2008年第6期31卷 933-941页

作者： Tsai, Chih-Ming Wang, Nenzi Chang Gung Univ Dept Mech Engn Tao Yuan 333 Taiwan

In this study we present an efficient global optimization method. DIviding RECTangle (direct) algorithm, for parametric analysis of dynamic systems. In a bounded constrained problem the direct algorithm explores multiple potentially optimal subspaces in one search. The algorithm also eliminates the need for derivative calculations which are required in some efficient gradient-based methods. In this Study the first optimization example is to find the dynamic parameters of a tennis racket. The second example is a biomechanical parametric study of a heel-toe running, model Governed by six factors. The effectiveness of the direct algorithm is compared with a genetic algorithm in an analysis of heel-toe running. The result shows that the direct algorithm obtains an improved result in 83% less execution time. It is demonstrated that the straightforward direct algorithm provides a general procedure for solving global optimization problems efficiently and confidently.

关键词： nonlinear least squares heel-toe running direct algorithm genetic algorithm

来源：评论

学校读者我要写书评

暂无评论

Adaptive control of servo motor by MRAC method

Adaptive control of servo motor by MRAC method

引用

IEEE Vehicle Power and Propulsion Conference (VPPC)

作者： Ehsani, M. S. Isfahan Univ Comp Eng Dept Esfahan Iran

ISBN: (纸本)9780780397606

This paper describes the design of a multi input multi output (MIMO) non-linear Model Reference Adaptive controller (MRAC) system for the digital servo motor. The complete design is developed determining the rate of gradient adaptation to MRAC in this paper. The MIT rule is used in the original MRAC. The main goal is to follow the desired position set as square wave. The important role of computer aided-design tools is illustrated using MATLAB and associated toolboxes. The control algorithm is implemented using a Pentium computer running the lab-tech notebook control program. The adaptive controlled system satisfactorily controls set point changes in velocity and position.

关键词： direct algorithm emulation MIT rule rate of gradient adaptation simulink model sensitivity derivative

来源：评论

学校读者我要写书评

暂无评论

direct algorithms to solve the two-sided obstacle problem for an M-matrix

引用

NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS 2006年第7期13卷 543-551页

作者： Zeng, J. P. Jiang, Y. J. Hunan Univ Coll Math & Econometr Changsha 410082 Hunan Peoples R China Changsha Univ Sci & Technol Coll Math & Comp Sci Changsha Peoples R China Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha Peoples R China

In this paper, two direct algorithms for solving the two-sided obstacle problem with an M-matrix are presented. The algorithms are well defined and have polynomial computational complexity. Copyright (C) 2006 John Wil... 详细信息

关键词： two-sided obstacle problem direct algorithm M-matrix polynomial computational complexity

来源：评论

学校读者我要写书评

暂无评论

RESEARCH OF PROBLEMS ON REALIZING direct algorithm OF WAVELET TRANSFORM

引用

Chinese Journal of Mechanical Engineering 2003年第2期16卷 136-140页

作者： Tang BaopingZhong YoumingQin ShurenDepartment of Mechanical Engineering,Chongqing University,Chongqing 400044, China Department of Mechanical Engineering Chongqing University 重庆 400044

direct algorithm of wavelet transform (WT) is the numerical algorithmobtained from the integral formula of WT by directly digitization. Some problems on realizing thealgorithm are studied. Some conclusions on the direct algorithm of discrete wavelet transform (DWT),such as discrete convolution operation formula of wavelet coefficients and wavelet components,sampling principle and technology to wavelets, deciding method for scale range of wavelets, measuresto solve edge effect problem, etc, are obtained. The realization of direct algorithm of continuouswavelet transform (CWT) is also studied. The computing cost of direct algorithm and Mallat algorithmof DWT are still studied, and the computing formulae are obtained. These works are beneficial todeeply understand WT and Mallat algorithm. Examples in the end show that direct algorithm can alsobe applied widely.

关键词： wavelet transform direct algorithm mallat algorithm

来源：评论

学校读者我要写书评

暂无评论

Deterministic Parallel Global Parameter Estimation for a Model of the Budding Yeast Cell Cycle

Deterministic Parallel Global Parameter Estimation for a Mod...

引用

作者： Panning, Thomas D. Virginia Tech | University

Two parallel deterministic direct search algorithms are combined to find improved parameters for a system of differential equations designed to simulate the cell cycle of budding yeast. Comparing the model simulation results to experimental data is difficult because most of the experimental data is qualitative rather than quantitative. An algorithm to convert simulation results to mutant phenotypes is presented. Vectors of the 143 parameters defining the differential equation model are rated by a discontinuous objective function. Parallel results on a 2200 processor supercomputer are presented for a global optimization algorithm, direct, a local optimization algorithm, MADS, and a hybrid of the two. A second formulation is presented that uses a system of smooth inequalities to evaluate the phenotype of a mutant. Preliminary results of this formulation are given.

关键词： computational biology MADS algorithm direct search direct algorithm Thesis

来源：评论

学校读者我要写书评

暂无评论

Design of zero reference codes by means of a global optimization method

引用

OPTICS EXPRESS 2005年第1期13卷 195-201页

作者： Saez-Landete, J Alonso, J Bernabeu, E Univ Complutense Fac Ciencias Fis Dept Opt E-28040 Madrid Spain

The grating measurement systems can be used for displacement and angle measurements. They require of zero reference codes to obtain zero reference signals and absolute measures. The zero reference signals are obtained from the autocorrelation of two identical zero reference codes. The design of codes which generate optimum signals is rather complex, especially for larges codes. In this paper we present a global optimization method, a direct algorithm for the design of zero reference codes. This method proves to be a powerful tool for solving this inverse problem. (C) 2005 Optical Society of America.

关键词： .optimum autocorrelation Lipschitz Global Optimization reference codes direct algorithm

来源：评论

学校读者我要写书评

暂无评论

Separation of sound sources propagated in the same direction

引用

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2005年第7期E88A卷 1665-1672页

作者： Ando, A Iwaki, M Ono, K Kurozumi, K NHK Japan Broadcasting Corp Tokyo 1578501 Japan

This paper describes a method for separating a target sound from other noise arriving in a single direction when the target cannot, therefore, be separated by directivity control. Microphones are arranged in a line toward the sources to form null sensitivity points at given distances from the microphones. The null points exclude non-target sound sources on the basis of weighting coefficients for microphone outputs determined by blind source separation. The separation problem is thereby simplified to instantaneous separation by adjustment of the time-delays for microphone outputs. The system uses a direct (i.e. non-iterative) algorithm for blind separation based on second-order statistics, assuming that all sources are non-stationary signals. Simulations show that the 2-microphone system can separate a target sound with separability of more than 40 dB for the 2-source problem, and 25 dB for the 3-source problem when the other sources are adjacent.

关键词： blind separation of signals independent component analysis microphone system direct algorithm decorrelation

来源：评论

学校读者我要写书评

暂无评论

Dynamic data structures for a direct search algorithm

引用

COMPUTATIONAL OPTIMIZATION AND APPLICATIONS 2002年第1期23卷 5-25页

作者： He, J Watson, LT Ramakrishnan, N Shaffer, CA Verstak, A Jiang, J Bae, K Tranter, WH Virginia Polytech Inst & State Univ Dept Comp Sci Blacksburg VA 24061 USA Virginia Polytech Inst & State Univ Dept Math Blacksburg VA 24061 USA Virginia Polytech Inst & State Univ Bradley Dept Elect & Comp Engn Blacksburg VA 24061 USA

The direct (DIviding RECTangles) algorithm of Jones, Perttunen, and Stuckman (Journal of Optimization Theory and Applications, vol. 79, no. 1, pp. 157-181, 1993), a variant of Lipschitzian methods for bound constrained global optimization, has proved effective even in higher dimensions. However, the performance of a direct implementation in real applications depends on the characteristics of the objective function, the problem dimension, and the desired solution accuracy. Implementations with static data structures often fail in practice, since it is difficult to predict memory resource requirements in advance. This is especially critical in multidisciplinary engineering design applications, where the direct optimization is just one small component of a much larger computation, and any component failure aborts the entire design process. To make the direct global optimization algorithm efficient and robust on large-scale, multidisciplinary engineering problems, a set of dynamic data structures is proposed here to balance the memory requirements with execution time, while simultaneously adapting to arbitrary problem size. The focus of this paper is on design issues of the dynamic data structures, and related memory management strategies. Numerical computing techniques and modifications of Jones' original direct algorithm in terms of stopping rules and box selection rules are also explored. Performance studies are done for synthetic test problems with multiple local optima. Results for application to a site-specific system simulator for wireless communications systems ((SW)-W-4) are also presented to demonstrate the effectiveness of the proposed dynamic data structures for an implementation of direct.

关键词： global optimization direct algorithm direct search dynamic data structures

来源：评论

学校读者我要写书评

暂无评论

direct algorithm for rectifying pairs of uncalibrated images

引用

ELECTRONICS LETTERS 2000年第5期36卷 419-420页

作者： Al-Shalfan, KA Haigh, JGB Ipson, SS Univ Bradford Dept Elect & Elect Engn Bradford BD7 1DP W Yorkshire England

Given the fundamental matrix connecting two uncalibrated images of a 3D scene, a convenient procedure is presented for determining transformations to make corresponding points lie on the same horizontal lines. The met... 详细信息

关键词： image processing Optical, image and video signal processing direct algorithm optical information processing fundamental matrix transformations calibration corresponding points rectification images uncalibrated images calibration cube rectifying pairs horizontal lines Measurement standards and calibration Image processing and restoration rectifying image pairs 3D scene

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：