term frequency

We use the term bandwidth to represent such a frequency range.

我们用频带宽度这个词来代表这样的频率范围.

The results show that it has better short term frequency stability and frequency drife performance with temperature.

试验表明，它具有良好的短期频率稳定度和温漂特性。

Measurement of short term frequency stability and phase noise of frequency source

频率源的短期频率稳定度及相位噪声测量

This paper compares several feature selection methods in text categorization, proposes a new feature selection method based on term frequency and inverse document frequency.

本文在分析比较几种用于文本分类的特征选择方法的基础上，提出了一种基于术语频率和逆文档频率的特征选择方法TDF。

A Text Classification Method Based on Term Frequency Classifier Ensemble

基于词频分类器集成的文本分类方法

Retrieve the entries affect the same proportion in the document term frequency weighting term.

检索词条在文档的比重同样影响词条的权重计算。

Therefore, a text categorization algorithm based on frequent patterns with term frequency is presented.

为此, 提出了基于分类规则树的带词频的频繁模式文本分类方法.

Treatise on the problem of short term frequency stability in Doppler-velocity measurement

多普勒测速的频率短期稳定度问题

Effect of Short Term Frequency Stability of Oscillators on the Velocity Precision in a TT& C System

测控系统中振荡器短稳对测速精度的影响

In the method, lexical chains are firstly constructed by calculating the semantic similarity between terms, then keywords are selected through taking account of term frequency and area.

该方法考虑了词汇之间的语义信息，能够改善关键词标引的性能。

Both short and long term frequency stabilities of the simultaneous oscillations are better than several Parts 1010.

它可使同时振荡的双波长之频率稳定度不论短周期或长周期都优于10－10。

Application of Weight Calculation Based on Term Frequency for E-mail Filtering

基于词频的权值计算在邮件过滤算法中的应用

To improve the accuracy of term frequency, SBGA employs a new method TFS, which takes word sense into account while calculating term frequency.

另外，为了提高词频计算的精度，SBGA采用了一种改进的词频计算方法TFS，将加权后词的同义词频率加到了原词频中。

The Requirement of Short Term Frequency Stability of RF Pulse Train for COR, MTI, and MTD Radar

COR、MTI、MTD雷达对射频脉冲序列频率短稳的要求

The Long Term Frequency Stability in the GPS Time Comparison

GPS时间比对的长期频率稳定度

The dissipation and frequency dispersion of the difference equation were analysed and on which the effects of Boussinesq term and correction term os well.

分析了差分方程的耗散性和频散性以及Boussinesq项和修正项对它们的影响。

An ultrashort term frequency forecast of the system frequency is made for the hydropower station and the results have been applied in computer frequency control of the hydropower station.

本文对主调频水电站进行系统频率超短期预报，并把预报结果直接应用于水电站的计算机频率控制。

Choice A study of Feature Selection for Text Categorization Base on Term Frequency

基于词条频率的特征选择算法研究

Current feature selection algorithms are all based on term frequency, and ignore the class information in the training sample set. A new feature selection algorithm based on class information was put forward.

目前的索引词选择算法大多是基于词频的，没有利用训练样本中的类别信息，为此提出了一种新的基于类别的特征选择算法。

The designed DCXO adopts Pierce architecture. The frequency drift correction is done by using a 6-bit automatic frequency control ( AFC) signal generated by the feedback correction loop between the oscillator and the base band. The long term stable frequency output has been obtained.

所设计的数控晶体振荡器采用Pierce结构，利用基带与振荡器的反馈环路产生的6位自动频率控制信号，对振荡器的频率漂移进行校准，能得到长期稳定的频率输出。

This paper presents the weight calculation based on term frequency by analyzing the important effects of E-mail character field in topic expression, and improves the traditional probabilistic model of resemblance calculation.

分析了邮件特征域在邮件主题表达力方面的重要作用，给出了基于特征域词频TF的权值计算方法，并改进了传统的文本相似度计算概率模型。

This article puts forward the concept of Chinese and English dictionary with reverse term frequency.

提出了带反向词频的中英文词典这一概念。

We can use term frequency to have a weighted calculation and improve traditional text similarity calculation probability model in SVM algorithm.

通过利用基于词频的权值计算，同时改进传统文本相似度计算概率模型，改进SVM算法实现邮件过滤系统。

The problem of short term frequency stability is one of the key-link techniques in Doppler-velocity measurement.

频率短期稳定度问题是多普勒测速关键技术之一。

A Novel Detective Method for Fundamental Current and Any Term Frequency Harmonic Current

基波电流和任意次数谐波电流检测新方法

In the database subsystem, the retrieved documents are represented by the fuzzy relational matrix of index-terms-documents, for each index term is weighted by a numerical weight according to its presence frequency in the document.

在数据库子系统，用索引词&文档模糊矩阵表示待检索的文档，对每个索引词，根据其在文档中的出现频率大小，引入了数值权重；

Based on it, we doa deep research on the space distribution and time distribution from the view of term frequency, mutual information and word similarity.

在此基础上，我们进行了新词特征的挖掘，从串频、互信息和相似度等角度主要对新词的空间分布规律和时间分布规律进行了分析。

Finally the term-document space is constructed by vector space model with term frequency weight. Secondly, the latent semantic analysis is studied.

向量空间采用词频作为权值的向量空间模型构建。其次，研究了潜在语义分析模型。

Ultrashort term frequency forecasting control for a Hydropower Station

水电站超短期预报频率控制

The paper present feature evaluating function based document frequency with minimum term frequency threshold to reduce the proportion of noise features and improving the quality of text categorization.

利用最小词频阈值的文档频特征评估函数减少噪声特征的比例，提高文本分类的质量。