查询词典 stationarity

This regression problem is dicult for several reasons: large number of examples, large number variables (most of which are discrete and multi-valued), non-stationarity of the distribution, and a conditional distribution of the dependent variable which is very dierent from those usually encountered in typical applications of machine learning and function approximation.

这个回归问题是，邸邪教组织有多少个原因：大量的例子，大批变量（其中大部分是离散和多值），非平稳性的分布，以及有条件的分布因变量，这是非常邸erent从这些一般遇到的典型应用机器学习和函数逼近。

the paper introduces long curtate new unequal ofdm system.adopts long curtate unequal benefit to be not to require that the second order adding the circulation prefix,being therefore likely to lead into period stationarity,making use of signal therefore in launching an array,counting characteristic property realizing blind estimation of route.this technology includes three kinds of method : subspace decomposition,correlation matching,and maximum likeewise,monte carlo simulation show that whentheeb/no is low,function is better than the other kinds of method.

摘 要：提出一种采用不等长分组新的ofdm系统。采用不等长分组的好处是不需要加循环前缀就能在发射序列中引入周期平稳性，因此，可利用信号的二阶统计特性实现信道盲估计。信道盲估计主要分子空间分解、相关拟合和最大似然三种方法。结合monte carlo仿真表明，在信噪比较低时，结合子空间分解方法计算出的误码性能比其余两种方法好。

Methods The definition of stationary random processes and joinly stationarity and the method of mathematics induction are used.

方法利用了平稳随机过程和联合平稳性的定义及数学归纳法。

Introduces the effect of tangent directional synthetic tolerance in driving to long-periodic error,and how to diminish maximal rotation angle tolerance in order to improve stationarity and drive accuracy that gear wheels move.

介绍齿轮切向综合误差在传动中对长周期误差的影响，减小最大转角误差，提高齿轮运动的平稳性和传动精度。

Based on the measurement sample stationarity in limited distance,the prediction model's limited astringency and mensurability to the dynamic measuring error and the prediction error respectively are proven.

首次研制成功了高精度任意二面角与圆分度测量系统，并编制了基于MS Windows的测量和系统控制软件。

I. on limited time segment, and the ergodicity and stationarity of the C. I. on T, M are studied. After that, a relationship between C. I. and gradient of objective function is revealed and a recurrence formula of C.

为此，我们首先定义了作为全文基础的双随机过程的相关积分，研究了集合平均上的相关积分，有限时间域上的相关积分和T.M区间上的相关积分及其各态历经性问题。

Control vehicle vibration whether rolling stock raise speed and improve key technology of stationarity their one of.

因此控制车辆振动是机车车辆提速并改善其平稳性的关键技术之一。

Clustering method is used to classify time series for stationarity analysis and a nonlinear transformation theory is presented.

采用聚类方法实现了金融多元时间序列平稳性的自动分类，并提出了非线性转换理论，大幅度提高了传统平稳性分析方法的准确率；4。

In this paper, total logistics amounts are chosen as evaluation index, and artificial time series are designed to solve the shortness of statistical data in Chinese logistics. Spectrum estimation theory depicts time characteristics in frequency domain thus has such benefit than time domain methods. This paper evaluates the period of Chinese logistics using spectrum estimation. Stationarity of artificial series is verified, parameter sensitivity of truncation point is analyzed, six periods with different delay window are compared, and significance of period evaluated is tested.

中国物流统计数据缺乏，客观上限制了对其周期规律的研究，本文选取社会物流总额作为测度指标，设计了一种人工序列，解决了统计数据过短问题；谱估计法从频域角度揭示客观事物的时间特性，在研究时间序列周期波动方面具有时域分析法所不具备的优势，作者采用谱估计法对中国物流发展周期进行测定，检验了指标序列平稳性，分析了截断点参数灵敏度，比较了6种不同滞后窗下周期值，并检验了所测得周期的显著性。

Firstly the sampling convolutive mixture signals are reseted for matching instantaneous mixture model, then considering non-stationarity of the sources, space whitening and joint block-diagonalization method is exploited to obtain the original signals.

该算法先将采集到的卷积混合信号进行重排，使之满足重新定义向量后的瞬时混合模型特征，然后考虑到信号的非平稳特性，采用空间白化和联合近似块对角化方法分离出源信号。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐