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1.
嵌入式系统往往对实时性、系统功耗和程序代码长度有特殊的要求,本文从程序设计的角度讨论满足这些要求的程序代码优化方法。文中首先讨论了程序执行时间的优化方法,随后讨论了程序代码长度的优化方法,最后讨论了程序功耗的优化方法。  相似文献   

2.
一种混合式机器翻译方法及其算法   总被引:3,自引:1,他引:3  
在机器翻译的研究中,混合式方法是一种好方法。本文的工作有:第一,讨论完全实例的机器翻译,提出了直接散列检索算法;第二,讨论句型转换的机器翻译;第三,讨论近似机器翻译。  相似文献   

3.
单片机系统的加密技术   总被引:2,自引:0,他引:2  
讨论了几种单片机系统的加密方法,经实验表明文中讨论的方法切实可行,具有良好的保密效果,为保护开发者的利益提供了有效的手段。  相似文献   

4.
文章讨论了基于UML状态图的测试用例生成方法,在此基础上,讨论了状态图测试中状态识别这一难点的解决方法,最后介绍了基于状态图的测试覆盖标准。  相似文献   

5.
单片机系统的加密技术   总被引:2,自引:0,他引:2  
讨论了几种单片机系统的加密方法,经实验表明文中讨论的方法切实可行,具有良好的保密效果,为保护系统开发者的利益提供了有效的手段。  相似文献   

6.
本文主要讨论了压缩机油台架试验的控制方法,包括硬件设计、数字PID原理和软件实现,同时讨论了使用寿命试验的控制方法。  相似文献   

7.
面向对象碰撞检测方法及其在分布式虚拟环境中的应用   总被引:31,自引:0,他引:31  
本文提出了一种面向对象的碰撞检测方法,分析了这种碰撞检测方法的时间复杂性,讨论了分布式环境中碰撞检测的完全性和唯一性等问题,提出了一种保证分布式虚拟环境中碰撞检测唯一性的方法,最后,讨论了这种方法在分布式虚拟环境DVENET中的应用。  相似文献   

8.
粒度转换是粒计算理论的重要内容之一。在总结讨论拓扑商空间的粒度转换的基础上,进一步讨论了半序结构的粒度转换,提出新的半序结构的拓扑合成方法。介绍了商空间理论中的粒度转换方法,引出半序空间的相关概念,主要提出了一种对多个半序空间进行合成的方法,并对合成后的结果进行了讨论,举例具体说明了该方法的使用步骤,说明了该方法的实用价值和意义。  相似文献   

9.
本文主要讨论了基于声霸卡的语音录放问题,并讨论了语音开发的一般方法,最后给出了汇编语言的实现代码。  相似文献   

10.
UML中用例的捕获和描述   总被引:2,自引:0,他引:2  
本文根据UML中用例的概念和特征,讨论了一个基于活动者驱动捕获用的方法。这种方法使系统分析,设计、实现之间形成了一个良性循环,同时结合一个简单的实例给予说明。文章最后讨论了用例的描述方法。  相似文献   

11.
A number of questions and results concerning Runge-Kutta and general linear methods are surveyed. These include order conditions and order bounds for Runge-Kutta methods, the A-stability of implicit Runge-Kutta methods based on Gaussian quadrature and transformation methods of implementation which lead to singly-implicit methods. The sections dealing with general linear methods include a discussion of the order conditions and an algebraic structure for carrying out order analyses as well as an introduction to a special function associated with parallel methods for stiff problems.  相似文献   

12.
图像轮廓提取方法研究   总被引:10,自引:0,他引:10  
对现有的轮廓提取现状进行分析,把主要的轮廓提取方法划分为先验知识法、数学形态法、基于梯度的方法、水平集方法、活动轮廓模型方法、以及神经动力学方法六大类,并研究这些方法的主要特点。对轮廓提取方法研究进行展望,提出神经动力学方法是轮廓提取方法的发展方向。  相似文献   

13.
In this paper, we present a comprehensive review of methods for spectral analysis of nonuniformly sampled data. For a given finite set of nonuniformly sampled data, a reasonable way to choose the Nyquist frequency and the resampling time are discussed. The various existing methods for spectral analysis of nonuniform data are grouped and described under four broad categories: methods based on least squares; methods based on interpolation techniques; methods based on slotted resampling; methods based on continuous time models. The performance of the methods under each category is evaluated on simulated data sets. The methods are then classified according to their capabilities to handle different types of spectrum, signal models and sampling patterns. Finally the performance of the different methods is evaluated on two real life nonuniform data sets. Apart from the spectral analysis methods, methods for exact signal reconstruction from nonuniform data are also reviewed.  相似文献   

14.
The evaluation of feature selection methods for text classification with small sample datasets must consider classification performance, stability, and efficiency. It is, thus, a multiple criteria decision-making (MCDM) problem. Yet there has been few research in feature selection evaluation using MCDM methods which considering multiple criteria. Therefore, we use MCDM-based methods for evaluating feature selection methods for text classification with small sample datasets. An experimental study is designed to compare five MCDM methods to validate the proposed approach with 10 feature selection methods, nine evaluation measures for binary classification, seven evaluation measures for multi-class classification, and three classifiers with 10 small datasets. Based on the ranked results of the five MCDM methods, we make recommendations concerning feature selection methods. The results demonstrate the effectiveness of the used MCDM-based method in evaluating feature selection methods.  相似文献   

15.
A general class of methods for (partial) rotation of a set of (loading) matrices to maximal agreement has been available in the literature since the 1980s. It contains a generalization of canonical correlation analysis as a special case. However, various other generalizations of canonical correlation analysis have been proposed. A new general class of methods for each such alternative generalization of canonical correlation is proposed. Together, these general classes of methods form a superclass of methods that strike a compromise between explaining the variance within sets of variables and explaining the agreement between sets of variables, as illustrated in some examples. Furthermore, one general algorithm for finding the solutions for all methods in all general classes is offered. As a consequence, for all methods in the superclass of methods, algorithms are available at once. For the existing methods, the general algorithm usually reduces to the standard algorithms employed in these methods, and thus the algorithms for all these methods are shown to be related to each other.  相似文献   

16.
电力智能单元传输规约的安全性是保障智能电网中智能通信实现高速、可靠、安全的基础。为了构建适用于电力智能单元传输规约的安全性分析模型,概述了主流的协议安全性分析理论与方法。基于符号模型的形式化方法包括逻辑推理、模型检验、定理证明;基于计算模型的计算方法包括RO模型、BCP模型、CK模型以及UC模型;基于计算可靠性理论的方法包括映射方法、模型方法、形式化方法的计算可靠性以及计算方法的直接形式化。提出了面向智能电网领域的电力智能单元传输规约安全性分析模型,为进一步的电力智能化单元传输规约的安全性分析奠定了基础。  相似文献   

17.
The purpose of this paper is devoted to studying the implicit–explicit (IMEX) one-leg methods for stiff delay differential equations (DDEs) which can be split into the stiff and nonstiff parts. IMEX one-leg methods are composed of implicit one-leg methods for the stiff part and explicit one-leg methods for the nonstiff part. We prove that if the IMEX one-leg methods is consistent of order 2 for the ordinary differential equations, and the implicit one-leg method is A-stable, then the IMEX one-leg methods for stiff DDEs are stable and convergent with order 2. Some numerical examples are given to verify the validity of the obtained theoretical results and the effectiveness of the presented methods.  相似文献   

18.
Two classes of relaxed parallel two-stage multisplitting methods based on extrapolated and AOR methods are studied for the solution of nonsingular linear systems, which are called outer relaxed or inner relaxed parallel two-stage multisplitting methods. Convergence of these methods is studied for H-matrix. Furthermore, computational results about these methods on a shared memory multiprocessor are presented. The results show that the methods we proposed are better than the corresponding existed parallel (two-stage) multisplitting methods.  相似文献   

19.
Vague值向Fuzzy值转化方法新探   总被引:3,自引:3,他引:0       下载免费PDF全文
用反例证明文献[1]提出的两种Vague值向Fuzzy值的转化方法是不满足准则1[2]和准则2[2]的。但是如果在这两个方法中补充参数的约束条件,则这两种方法皆是实用方法。提出两种Vague值向Fuzzy值新的转化方法,证明了它们是实用方法。  相似文献   

20.
数值求解迭代Tikhonov正则化方法的一点注记   总被引:2,自引:0,他引:2  
(?)1.引 言 我们考虑如下形式的不适定算子方程 Af=g,(1)其中 A:F→G为一个有界线性算子,F,G为Hilbert空间.通常右端项g为“观测数据”,因而不可避免地带有一定的误差δ,即我们所得到的数据为gδ,满足:||g—gδ||≤δ.有时即使A-1:Range(A)→F存在,但也未必连续,因而数值求解相当不稳定[2,3].消除不稳定性的一个自然的方式是用一簇接近适定问题的模型去逼近原问题,比如说最著名的Tikhonov正则化方法,用如下适定的算于方程 (A*A+αI)fα=A*gδ(2)  相似文献   

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