frequency domain measure 中文意思是什麼
frequency domain measure
解釋
頻域測量-
Chapter 8. the fully distributed optical fiber sensor system on base of raman and rayleigh optical frequency - domain reflectometry to measure microbend and temperature simultaneously is developed
第八章，研究了基於rayleigh光頻域背向散射和raman光頻域背向散射理論同時測量微彎和溫度分佈的全分散式光纖傳感器系統。 -
Then one remote supervision system based on virtual instrument technology is studied and realized. the system can measure parameters such as signal level, carrier frequency and snr of remote channel, and can estimate the state of remote channel based on this parameters, and can display the time - domain and frequency - domain wave real time of remote channel, too
針對目前遠動監控方案的不足，研究並實現了基於虛擬儀器技術的電力遠動通道監控系統，該系統可以對遠動收發信電平、載波頻率和信噪比三個通道參數進行測量，具有實時時域波形和功率譜波形顯示功能，並能根據通道參數對通道狀態進行綜合判斷。 -
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 -
It is very constructive to get power quality parameter in time. in this paper, we study the power quality parameter arithmetic in difference and research tune wave measure in particular. we give a new method based on transform of the shannon wavelet packet interpolation in frequency domain
本論文研究了電能質量各參數的測量演算法，特別是針對目前頗受關注的電網諧波檢測技術進行了深入的探討，提出了一種shannon小波頻域內插的小波包分解諧波檢測方法，模擬試驗表明該方法達到了很好的抗混疊效果，同時還能檢測出諧波中的高頻成分以及電網中的次諧波干擾。 -
In the time - domain, based on the principle of random sampling of dso. two way ( " time amplifing in dual slope integral " and " time - voltage convert " ) are implemented to measure the time between the system triger and writing clock. thus random sampling interpolate can be done to measure repeated signal in high frequency with the a / d convert and controller which frequency are lower
在時域，根據數字示波器隨機取樣原理，用兩種方法（雙斜率積分時間放大測量方法和時間? ?電壓轉換測量方法）測量數字示波器系統觸發和采樣寫時鐘間時間間隔，用低速a / d轉換器及控制器進行模?數轉換和控制，以此進行隨機取樣內插，從而實現了對高頻率重復信號的測量。 -
In the thesis, a functional software was developed for auto - analyzing the field evoked potential, which can automatically measure the time domain parameters such as the amplitude area latency of population spikes, the slope of excitatory postsynaptic potential and so on, it also can make the frequency - domain analysis
它可以自動、快速地測出海馬誘發場電位的時域參數，如：群體峰電位（ populationspikes ， ps ）的幅度、面積、潛伏期以及興奮性突觸后電位（ excitatorypostsynapticpotentials ， epsp ）的斜率等，同時也可以對信號進行頻域分析和處理。 -
" modulation domain " ( mod ) is a plane domain which is consisted of frequency and time of signals. it is a necessary field to measure signals in three - dimension space of signal ( time domain, frequency domain and modulation domain )
調制域是由信號的時間和頻率兩個軸構成的平面域，是對信號進行三維（時域、頻域、調制域）測量不可缺少的一個測試域。 -
When coaxial - line probe is used to measure the permittivity of biological tissues, the pulse is used as an excitation in order to get more information in frequency domain. so frequency - dependent finite difference time - domain method is used to calculate the forward problem. it need not change the pulse into frequency - domain, and can calculate the problem in time - domain, which saves the memory space and makes calculation fast genetic algorithm ( ga ) is used to solve the inverse problem
在同軸線用於獲取生物組織的介電常數的研究中，為了獲得更多的頻域信息，採用脈沖作為激勵，故數值計算的方法採用基於頻域的時域有限差分法，該方法不用將脈沖變為頻域問題，可在時域中直接求解，因此極大節約了計算空間，在短時間內可計算完正問題。
分享友人