| 1. | 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 |
| 2. | Short - term frequency stability
短期频率稳定度 |
| 3. | Long - term frequency stability
长期频率稳定度 |
| 4. | 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。 |
| 5. | The first step in nntcs is chinese word segmentation on chinese documents . feature terms are selected from documents . term frequencies of each term are recorded
在nntcs中，第一步是对中文文档进行汉语分词，从文档中抽出特征词，并且统计各特征词的词频。 |
| 6. | In the modem experimental investigation of quantum optics and quantum information , the accuracy of the long - term frequency stability of lasers is required in the range of a few mhz
由于在量子光学及量子信息等有关实验中，需要多处进行频率锁定，且精度在兆赫( mhz )范围。 |
| 7. | In nntcs , we use artificial neural networks ( ann ) as the classifier . the recorded term frequencies form the original feature vector , matching with neurons in the input layer of ann one by one
系统使用神经网络作为分类器，特征词的词频组成原始特征向量，和神经网络输入层的神经元一一对应。 |
| 8. | A common ranking method ? term frequency / inverse document frequency ? considers the distribution of words and their frequencies , then generates numerical weights for words that signify their importance in individual documents
常见的排行方法之一是评估字词的分布与出现频率，即词频与文件频率倒数，然后为字词建立权值，代表各字词在个别文件内的重要性。 |
| 9. | This paper discusses the existent typical ranking technologies of term frequency count and hyperlink analysis , in virtue of vector space model , the author proposes a new ranking technique , document similarity ranking , with a basis on similarity of concept - semantic query term
对现存典型的词频统计排序技术和超链分析排序技术进行了分析,并借助向量空间模型,提出了一种基于概念语义的查询词-文档相似度排序方法。 |
| 10. | This paper introduces the basic concepts and importance of short - term frequency stability and phase noise , its expression in time domain and in frequency domain , the methods of measurements of phase noise and compares their advantages and disadvantages respectively
摘要叙述了短期频率稳定度、相位噪声的基本概念和重要性、在时域和频域中的表达方法以及各种相位噪声的测量方法，并且分别比较了各种方法间的优缺点。 |
