查询词典 linear algebra

This system is fitted separately by six models of before linear system and after linear system and then the optimal model with minimum relative error is chosen to describe the system.

利用前线性系统与后线性系统中的6个模型来分别拟合该系统，从中选取辨识相对误差最小的模型来描述该非线性系统。

Results the parameter estimates and it's stability of linear regression models is associated with the variation of explanatory variable between and within level 2units,and the relationship of parameter estimates and it's stability between linear regression models and variance component model is associated with level 2 residual variance or intatra-unit correlation.

结果 线性回归模型参数估计以及估计的稳定性与自变量在水平2单位间和水平2单位内的变异大小有关，线性因归模型与方差成分模型参数估计及其稳定性的关系与水平2残差方差或单位内相关系数大小有关。

On global optimal algorithms, a heuristic 0-1 Integer Liner Programming algorithm is achieved, which combines heuristic enumeration method and revised simplex method. Simulation experiments show that the degree and optimization efficiency in our algorithm is obviously improved compared with the MATLAB 7 bintprog function that is a 0-1 integer programming algorithm. Moreover our algorithm isn\'t relevant to the scale changes of Web services composition and candidate service sets, thus it is applicable for the scenes that the scales of Web services composition changed dynamically. But for Web services composition with service alliance, the algorithm is unable because the non-linear global optimal model of the fitness function and QoS constraints can\'t be expressed in linear mode.

在全局优化算法研究上，基于启发式0-1整线性规划算法结合了修正单纯形法和启发式枚举法，仿真实验表明该算法与MATLAB 7的0-1整数规划方法比较，在优化程度及优化效率上得到了显著改进，并且对服务组合和候选服务集合的规模变化没有明显的相关性，因而该算法可用于服务组合规模动态变化的场景，但该算法不能应用于存在服务联盟的非线性全局优化模型。

In this paper, we shall apply this concept to the ring of linear operators on Banach space X and prove that if a linear operator T on a Banach space X is defined in all of X and has finite descent and ascent then there is a Drazin inverse T~D satisfying TT~DT~k=T~k, T~DTT~D= T~D, and T~DT=TT~D for some nonegative integer k.

以后又对方阵的Drazin逆作了深入的研究。它的一些性质可以参阅。同时对它的应用也作了许多研究，例如可以把Drazin逆的概念应用到Markov过程、线性微分方程组、差分方程组和最优控制等方面。

Monte Carlo simulation results show that the particle filter with threshold de-noising can effectively reduce the filter root mean square error and improve filter accuracy, and that in the corresponding linear and non-linear systems are reduced by 14% and 12% respectively.

在所采用的线性及非线性系统中，均方根误差均值分别降低了14%和12%。

In statistical analysis of ordinal data, we usually build up linear-by-linear association model and meet a trouble of choice of scores. Graubards et a1 (1987) proposed several methods for score choice in independence test in ordinal 2×κ contingency tables: equally spaced scores, midpoint scores and midrank scores. He also pointed out that the result of independence test may be different for the different choice of scores according to the same association model. Agresti et a1 (1987) treated the score vector in row effects and column effects model for two-way contingency tables as parameters and derived the necessary and sufficient condition of the solution under monotone order restriction by Kuhn- Tucker conditions.

在有序数据的统计分析中，通常要建立线线相关模型，其中得分的选取是一个棘手的问题，Graubard et a1（1987）给出了有序2×κ列联表中独立性检验的几种得分选取方法：等距离得分，中点得分和midrank得分等，同时指出，对于同一个相关模型，独立性的检验会由于得分选取的不同而得到不同的结论，Agresti et al（1987）把二维列联表中的行效应和列效应模型中的得分向量作为参数，在满足递增的序关系情况下，利用Kuhn-Tucker条件给出了解的充要条件。

The experiment was divided into two parts: linear guidance and waypoint guidance by satellite. In order to get a better result for linear guidance, the four parameters "rud","ctr","yau", and "trn" of the Pilot model for Autopilot were properly selected. Here, the GPS receiver was used only for collection of satellite signals and storage of data.

实验分为自线导航与卫星导航两部分：在直线导航中，修改自动导航器Pilot模式下的rud、ctr、yau和trn四个参数，藉以找出直线行进时较理想的状况，此时的GPS接收机仅做为接收卫星讯号并记录之用。

There are four innovations in this paper: firstly, in order to focus our research on the development of matured stock market, we use the data in 2007 as our sample interval, which makes the results of the model more convincing. Secondly, taking the potential non-linear relationship among the various of indexes fully into account, we employ cointegration test instead of using the multiple variables linear regression method to study stock price index and macroeconomy.

其次，国内对股票价格指数和宏观经济的研究主要采用多元线性回归方法，本文在实证研究方面，充分考虑到各种指标之间潜在的非线性关系，运用了协整检验的方法，避免了可能出现的"伪回归"现象。

This article introduces the status quo of linear stepping electric motor and research content of this topic, then discusses the development of linear stepping motor drive unit and general situation of the researched sample unit, furthermore supply the detailed introduction to DSP controller.

本文首先对直线电机的发展情况以及本课题的研究内容进行了介绍，然后讨论了直线步进电机驱动器的发展和本文所研究的样机的概况，接着对DSP控制器作了详细地介绍。

Linear maps take elements from a linear space to another, in a manner that is compatible with the addition and scalar multiplication given on the vector space.

唯一的要求是，在标形式的数学结构，称为领域。在应用软件，这一领域通常是外地的实数或复数领域。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

乌鸦叫。 51-论文网