餘弦層 的英文怎麼說
中文拼音 [yúxiáncéng]
餘弦層
英文
cos-type layer-
Based on the qps ionosphere model, the gradients model 、 quasi - cosine disturbed model and qps model with es layer are also introduced. then using the platform, the backscatter ionogram of these typical states are simulated, comparing with the real ionogram to find that they can match well, which proves the validity and practicability of the platform. the influence of the inputting parameters of these model and antenna patterns on the backscatter ionogram is also discussed in this paper
本文在球形對稱準拋物電離層模型基礎上，分別引入了梯度模型、準餘弦擾動模型、包含es層的準拋物模型，然後利用該模擬平臺，對這幾種典型電離層狀態的返回散射電離圖進行了模擬，並與實測圖進行了比較，一致性很好，證明了該模擬平臺的有效性和實用性。A method that combines category - based and keyword - based concepts for a better information retrieval system is introduced. to improve document clustering, a document similarity measure based on cosine vector and keywords frequency in documents is proposed, but also with an input ontology. the ontology is domain specific and includes a list of keywords organized by degree of importance to the categories of the ontology, and by means of semantic knowledge, the ontology can improve the effects of document similarity measure and feedback of information retrieval systems. two approaches to evaluating the performance of this similarity measure and the comparison with standard cosine vector similarity measure are also described
介紹了一種綜合各層級分類類目和對應關鍵詞來構造概念體系並用於改進信息檢索系統效果的方法.為了改進文本聚類的效果，提出了將領域知識本體和文本關鍵詞詞頻相結合的基於餘弦向量的文本相似性測度方法.該本體面向特定領域，將關鍵詞以不同權值對應于各分類類目，通過其語義知識來改進文本相似性測度以及信息檢索系統的效果.進一步給出了對基於本體的相似性測度方法進行效果評價的2種策略以及該方法與經典餘弦向量測度方法的比較結果The watermarking scheme based on wavelet decomposition and discrete cosine transform using a binary pattern or gray - level pattern as the watermark, the scheme initially performs wavelet decomposition of the host image and the watermark with different hierarchy. after the pseudo - random permutation, each decomposed layer of the watermark is embedded into the dct domain of corresponding decomposed layer of the host image
基於小波分解和餘弦變換結合的水印方案演算法以二值圖標或灰度圖標作為水印，將原圖像和水印信號分別進行不同層次的小波分解，分解后的水印各分量偽隨機置亂後分別嵌入到原圖像相應分解層各分量的dct域中。This method is based on the bent ionosphere model and the coefficient of dynamic correction is introduced into traditional cosine correction model to achieve dynamic correction of ionosphere delay. so the position error of over correction can be overcomed
該方法以bent電離層模型為基礎，在餘弦電離層修正模型的基礎上，引入動態修正系數，從而克服了採用通常修正方法帶來的過修正誤差。分享友人