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初值估计
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  initial estimates
     Some problems in the initial estimates and the convergence of Newton Raphson iteration are discussed.
     从而有效地解决了 Newton- Raphson迭代算法中的初值估计问题 ,并提高了迭代的收敛速度
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     Initial Estimates in Digital image Correlation Method by a New Displacement Mode
     非常应变模式数字相关方法的初值估计
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     (2) using fast iteration to give the initial estimates of displacement.
     (2 )快速迭代初值估计方法 .
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     Considering that in most hand-eye calibration methods, the basic equation needs to be solved, a new initial estimates method for robotic hand-eye calibration was proposed.
     针对目前机器人手眼标定的方法大多需要求解手眼标定的基本方程,提出了一种新的用于机器人手眼标定中初值估计的方法.
短句来源
     Two methods of initial estimates are proposed: (1) using real time image subtraction scheme and a micro motion compensation mechanism to take zero constantly as initial estimates;
     对相关迭代算法中的初值估计问题进行了研究 ,提出两种初值估计方法 :(1 )利用“实时相减”和“精密调节”相结合的方法而获得零初值 ;
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  “初值估计”译为未确定词的双语例句
     M - the moment method to estimate the three fundamental parameters of the P-Ⅲ distribution, the mean Ex, the coefficient of variation Cv and the coefficient of skewness Cs, as first fitted values;
     我们可以通过MTLK方案将P-Ⅲ分布用于拟含9批样本中经过初步判断具有可拟性的3批数据: M——初值估计采用矩法,即以矩法估计P-Ⅲ分布的三个基本参数:平均数Ex,离势系数Cv和偏差系数Cs,做为下面将要进行的适线法之初始值。
短句来源
     To deal with the computation efficiency problem of power system transient stability distributed simulation using branch cutting and subsystem iterating parallel method, the paper analyzes the characteristics of bus voltage in the electromechanical transient process and of message communication between subsystems in the process of distributed computation.
     针对基于支路分割和区域迭代的暂态稳定分布式并行算法的计算效率问题 ,根据电力系统机电暂态过程电气变量的响应特点和分布式协同计算实现过程中子系统间的信息交接特点 ,提出了改善暂态稳定仿真分布式计算效率的积分步初值估计法和积分步内交接变量修正调节法。
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     Simulation results show its validity.
     仿真结果表明了解耦CMKF算法及其初值估计的有效性 .
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     ESTIMATION THE INITIAL VALUES AND OPTIMIZATION FITTING OF PARAMETERS OF SCHOOLFIELD MODEL
     SCHOOLFIELD模型参数的初值估计及最优化拟合
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     Estimation Method of Initial Conditions Based on Time-Varying Coupled Map Lattice Model
     一种时变耦合映象格子模型的初值估计方法
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  相似匹配句对
     AN ADAPTIVE ESTIMATION OF INITIAL RESIDULS
     残差初值的自适应估计
短句来源
     b) a G-M estimator of ω'1α, ω'2β and ω'1α+ω'2β under L (Xβ, Aα; δ21V, δ22U} respectively.
     b)G-M估计
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     CHOICE OF INITIAL VALUE FOR ROBUST ESTIMATION
     抗差估计初值选择
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     An Estimator of Reflection Coefficients
     反射系数的估计
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  initial estimate
We propose a method for minimizing these errors that is based on a sequential variation of the initial estimate Ci ? Ci0 → Cij, j = 0, 1, 2, ...
      
An analysis of the contribution made by the Levy-Zhang mechanism to the magnetoresistance demonstrates that the initial estimate obtained for this contribution is considerably exaggerated.
      
coli O157:H7 outbreak data provide an initial estimate of the most likely value of the dose-response relationship within the bounds of an envelope defined by beta-Poisson dose-response models fit to the EPEC and S.
      
We present a technique that integrates both photometric and geometric models with an initial estimate of the boundary.
      
As a result, a better initial estimate can be computed by our algorithm and thus the number of iterations needed during minimization are reduced tenfold.
      
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  initial estimates
The initial estimates obtained over the two training blocks are next exploited to jointly estimate the CFO.
      
thornei populations had increased from three to 15 times the initial estimates.
      
Although these 6 coefficients cannot be determined before inversion, initial estimates can be used.
      
Particular attention is given to the robust initial estimates of the transformation parameters, which should have a high breakdown point in order to provide reliable residuals for the following estimation.
      
The median method is applied to solve for robust initial estimates of transformation parameters since it has the highest breakdown point.
      
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This paper presents a further investigation of methodology and the theory for establishing a mathematical model of machine tool by Time Series Analysis. It improves the DDS (Dynamic Data System) modeling methodology as well. The sequence of data was obtained by measuring the relative displacement betweenworkpiece and cutter in the cutting process of a Type-C6150 lathe. Some approaches to the estimation of initial values and determination of the order of a model have been developed in this paper. The computing...

This paper presents a further investigation of methodology and the theory for establishing a mathematical model of machine tool by Time Series Analysis. It improves the DDS (Dynamic Data System) modeling methodology as well. The sequence of data was obtained by measuring the relative displacement betweenworkpiece and cutter in the cutting process of a Type-C6150 lathe. Some approaches to the estimation of initial values and determination of the order of a model have been developed in this paper. The computing work for establishing ARMA model is ap-parently reduced. In the Nonlinear Least Squares method, cumbersome calculations could be avoided, which took place when difference was used instead of partial differentials in DDS. The paper also proposes a new approach, the so-called“Increment Transforma- tion”, to solve ill-conditioned equation. This approach not only would require less computation time, but could be generalized to other cases as system identification or curve fitting by the Least Squares. A handy empirical formula is provided for checking by F-criterion. As a result the emperical formula renders it unnecessary to refer to the function table and besides, checking can be conveniently done on a computer. Finally, the frequency characteristics of mathematical models are computed. The results obtained coincide with the average of the Frequency Spectrum using FFT. Thus, it verifies the accuracy of the model and the advantages of the Time Series Analysis in building mathematical models.

本文探讨用时间序列分析法建模的具体步骤和理论,并以车床加工中的动态数据为例进行建模。文章提出的初值估计和确定模型阶数的有效方法,可使建立ARMA模型的工作量显著减少。文章还提出了克服病态方程的新方法——增量变换法。该法计算速度快,而且可推广应用到其他最小二乘法建模和曲线拟合。文中提供的F分布检验的简便经验公式,可避免查表,且便于计算机实现。文章最后对所得到的数学模型作了频谱特性的计算,其结果与原始数据直接用FFT得到的频谱特性相当吻合,从而进一步肯定了模型的准确性。

To find some methods for studying probability distributions of r -strategic insect populations in their inhabited spaces, the type H of peason curve system (the P-Ⅲ distribution) is used to fit for 9 samples obtained at different dates during a mixed population of Myzus persicae Sulzer and Lipaphis erysimi Kalt-enbach grew on Chinese cabbage in the suburbs of Beijing in autumn, 1981.The P-Ⅲ distribution may be fitted to the data of three samples with prejudged fittabity among the 9 samples, in terms of the MTLK...

To find some methods for studying probability distributions of r -strategic insect populations in their inhabited spaces, the type H of peason curve system (the P-Ⅲ distribution) is used to fit for 9 samples obtained at different dates during a mixed population of Myzus persicae Sulzer and Lipaphis erysimi Kalt-enbach grew on Chinese cabbage in the suburbs of Beijing in autumn, 1981.The P-Ⅲ distribution may be fitted to the data of three samples with prejudged fittabity among the 9 samples, in terms of the MTLK scheme;M - the moment method to estimate the three fundamental parameters of the P-Ⅲ distribution, the mean Ex, the coefficient of variation Cv and the coefficient of skewness Cs, as first fitted values;T - the numerical table giving P-values, cumulative probabilities of the P-Ⅲdistribution according to given Cs and φ-values, standardized variables of the sample data, x's.L - the line-fitted method to realize a good fit which is reached automatically on a computer, with an optimization technique of generating a set of regular triangles in the coordinate system of Cv and Cs (the GRT method, abbr.).K - the Kolmogorov test determining the goodness of fit.As results, two of the 3 samples are fitted theoretically. And with b = Ex*( 1 - 2 *Cv/Cs), w = 4/Cs2 and β= 2 /(Ex Cv Cs) , the probability density function of P-Ⅲ distribution is valuated more properly:The report comes to the conclusion that:1. The continuous probability distribution can be used in fit of some field sample data of r-strategic insect populations as contrasted with conventional methods in fit of that of K-strategic insect populations and some r-strategic ones by discrete distributions, as such the Poisson, the negative binomial and the A-type of Neymans', etc, 2. It is possible to describe the spatial distribution pattern dynamics of the aphid populations, to certain extent at least, with the aid of the Peason curve system.3. As a preliminary research, there are quite a few problems to be solved further, for example, the GRT method actually running in a non-uniform gradient field of goodness of fit.

为寻求某些研究r-对策昆虫种群在其生境空间的概率分布的方法,我们用Pesson Ⅲ型曲线(简称P-Ⅲ分布)拟合了菜蚜种群的9批抽样数据,它们是1981年在菜蚜种群发生期的不同日期抽取于北京郊区的秋白菜田间。 我们可以通过MTLK方案将P-Ⅲ分布用于拟含9批样本中经过初步判断具有可拟性的3批数据: M——初值估计采用矩法,即以矩法估计P-Ⅲ分布的三个基本参数:平均数Ex,离势系数Cv和偏差系数Cs,做为下面将要进行的适线法之初始值。 T——P-Ⅲ分布的累积概率值p是由数表给出,具体做法是由给定的Cs值和抽样数据x的标准化变量φ值在数表中查得p值。 L——以适线法实现良好的拟合,该法是在计算机上通过一项最优化技术,即在Cv-Cs直角坐标系中产生一组正三角形(简称GRT法),以自动得到拟合的良好结果。 K——对拟合优度采用柯尔莫哥洛夫检验。 拟合结果,3批样本中有两批可理论地拟合。该P-Ⅲ分布的概率密度函数为f(x)=βα/г(α)(x-b)~(α-1)*exp(-β*(x-b)),(b≤x<∞)其中b=Ex*(1-2*Cv/Cs),α=4/Cs~2,β=2/(Ex*Cv*Cs),经过拟合后,b、α和β...

为寻求某些研究r-对策昆虫种群在其生境空间的概率分布的方法,我们用Pesson Ⅲ型曲线(简称P-Ⅲ分布)拟合了菜蚜种群的9批抽样数据,它们是1981年在菜蚜种群发生期的不同日期抽取于北京郊区的秋白菜田间。 我们可以通过MTLK方案将P-Ⅲ分布用于拟含9批样本中经过初步判断具有可拟性的3批数据: M——初值估计采用矩法,即以矩法估计P-Ⅲ分布的三个基本参数:平均数Ex,离势系数Cv和偏差系数Cs,做为下面将要进行的适线法之初始值。 T——P-Ⅲ分布的累积概率值p是由数表给出,具体做法是由给定的Cs值和抽样数据x的标准化变量φ值在数表中查得p值。 L——以适线法实现良好的拟合,该法是在计算机上通过一项最优化技术,即在Cv-Cs直角坐标系中产生一组正三角形(简称GRT法),以自动得到拟合的良好结果。 K——对拟合优度采用柯尔莫哥洛夫检验。 拟合结果,3批样本中有两批可理论地拟合。该P-Ⅲ分布的概率密度函数为f(x)=βα/г(α)(x-b)~(α-1)*exp(-β*(x-b)),(b≤x<∞)其中b=Ex*(1-2*Cv/Cs),α=4/Cs~2,β=2/(Ex*Cv*Cs),经过拟合后,b、α和β的取值便更加适合了。 本文得出的结论是: 1.连续型概率分布可以被用来拟合某些r-对策昆虫种群的田间抽样数据,这是与传统的方法不同的。这里所谓传统的方法是指用于拟合k-对策昆?

This paper gives a theoretical proof on the initial estimation of the steplength in line searches for least square problem. This estimation is proposed by Al-baali a and Fletcher firstly. This paper discusses this problem for both BFGS method and the mixed method for solving least square problem.

本文对于最小二乘问题给出直接搜索中步长初值估计的一个理论证明。这个估计是Al-baali与Fletcher首先提出的。本文对于解最小二乘问题的BFGS法与混合法讨论了这个问题。

 
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