background correction 中文意思是什麼

background correction 解釋
背景校正
  • background : n 1 後景，背景；基本情況；（紡織品等的）底子；出身；經歷。2 隱蔽的[不引人注目的]地位；幕後。3 襯...
  • correction : n 修正，改正；校正；矯正；〈古語〉懲罰；勘誤表，補正。 a copy disfigured by numerous corrections ...
  1. Turbo codes represent the new code structures, which consist of pccc ( parallel serially convolutional code ) and sccc ( serially concatenated convolutional code ). in this paper, the background of turbo codes are firstly introduced, which includes the base principle of error correction code 、 block code and convolutional code ; the principle of turbo code and the iterative decoding is secondly expanded ; the key decoding algorithm : a revised map algorithm and iterative decoding theory are detailed ; then, a new turbo code structure : hccc ( hybrid concatenated convolutional code ) is presented, and the capacity of this code method is analyzed, the average capacity upper bound is derived ; at last, this code is simulated on awgn ( additive white gaussian noise ) channel and rayleigh fading channel

    本文首先介紹了turbo碼的背景知識，包括差錯控制的基本原理、分組碼和卷積碼；然後闡述了turbo碼的基本原理，包括turbo編譯碼器結構及迭代譯碼原理；較為詳細地描述了關鍵的譯碼演算法： ?種改進的最大后驗概率（ map ）譯碼演算法及迭代譯碼演算法；提出了一種新的turbo碼結構：混合turbo碼（混合級聯卷積碼） ；並用編碼性能聯合界分析方法對混合turbo碼進行了性能分析，得出了其平均性能上界；並在高斯白噪聲通道和瑞利衰落通道上分別作了一些應用研究及計算機模擬實驗。
  2. And the other of the teaching and study is as, teaching theme setup, directional self - study, detailed direction, level practice, correction and improvement. its stratagem and operation form is : make various education background into one group to study together ; set different aims to reach the targets gradually ; give lessons with different levels to develop the students " capacity

    分層遞進教學是根據學生學習可能達到的水平和客觀差異性，把教學對象、課堂教學目標和教學活動的層次化，其教學模式：導入課題、定向自學、交流導學、分層練習和矯正提高。其策略和操作形式是：異質建組、合作學習；目標分層制定，分步達標；分層施教，自主發展。
  3. Many instruments are equipped to carry out this background correction on an automatic basis.

    許多儀器已經裝備了這種自動本底校正器。
  4. Effect of different kind of background correction on glomerular filtration rate measured by dynamic renal imaging with 99mtc - dtpa

    不同本底感興趣區對顯像法測定腎小球濾過率的影響
  5. A hybrid migration method, named " fourier finite - difference migration ", is a post - stack depth migration scheme. the downward extrapolation operator is split into three operators : one operator is a phase - shift operator for a chosen constant background velocity, another operator is the well - known first - order correction term, and the third operator is a finite - difference operator for the varying of the velocity function. phase - shift downward extrapolation and finite - difference downward extrapolation preserves the advantage of phase - shift method and finite - difference method

    傅立葉有限差分（簡稱ffd ）偏移演算法是一種疊后深度偏移演算法，其向下延拓運算元是一種混合運算元，包括三項：一項是處理常速的相移運算元，一項是一階相移修正運算元，最後一項是類似45度方程的有限差分運算元，用來處理劇烈橫向變速。
  6. Using this description of space, the contours of printed regions arc identified with significant accuracy. the new approach is fast as there is no need for skew detection and correction in most conditions, and only few simple operations are performed on the description of the background ( not on the pixel - base data ). in addition to the page segmentation step, we also introduce a skew detection method based on two vertical lines

    和同類方法比較，該方法具有許多的優點：它對于版面中非規則的復雜圖形的處理可以得到和對規則圖形處理一樣的效是；在模糊參數選取經驗值的情況下對于傾斜的版面同樣可以進行處理，並且不影響處理的效果；該方法還可以針對某一特定區域而非整個版面單獨使用。
  7. Although adsl comes with new digital processing, coding, modulation and error correction technologies, it is also faced with various challenges out of subscriber lines, such as background noise, impulse noise, insertion loss, cross talk, wire size variations, bridge tap, line joints and line insulation, etc. all those factors tend to produce adverse impacts on the performance of high - speed transmission services. firstly, the insertion loss of copper lines increases in proportion to the length of lines

    雖然adsl採用先進的數字信號處理技術、編碼調制技術和糾錯技術，但是在推廣adsl業務時，用戶線路的許多特性，包括線路上的背景噪聲、脈沖噪聲、線路的插入損耗、線路間的串擾、線徑的變化、線路的橋接抽頭、線路接頭和線路絕緣等因素將影響高速率傳輸業務的性能。
  8. As the parts of the main contributions, the research projects focus mainly on how to improve gps surveying by reducing ionospheric delay for dual / single frequency kinematic / static users : high accuracy correction of ionospheric delay for single / dual frequency gps users on the earth and in space, china waas ionospheric modeling and the theory and method of monitoring of ionosphere using gps. the main contents of this ph. d paper consist of two parts : fisrt part - the outline of research background and the systematic introduction and summarization of the previous research results of this work

    本文主要包括兩方面的內容：一、研究背景的一般性描述及相關基礎研究的系統總結和介紹，主要涉及：地球電離層研究意義，地球電離層探測技術與相關理論研究的內容，現代大地測量中電離層問題的由來、嚴重性與新課題，地球電離層的基本特性及其對電波傳播的影響， gps定位的基本理論與方法，電離層延遲對gps測量的影響， gps的電離層延遲改正的基本方法，基於gps的電離層研究的基本原理與方法等。
  9. The contents of pb and cd in soils and base - muds are determined by graphite furnace atomic absorption spectrometry with self - absorption background correction and ( nh4 ) 2hp04 as matrix modifier

    摘要利用自吸效應背景校正，以磷酸氫二銨為基體改進劑，石墨爐原子吸收法測定土壤和底泥中的鉛、鎘。
  10. Furthermore, the optimum analysis conditions are determined comprehensively study of the digestion way of the silicate samples, selection of the spectral lines, the analysis parameters of the apparatus and the background correction etc

    對硅酸鹽的熔樣方法、元素分析譜線的選擇、背景校正及元素間干擾及儀器分析參數等因素進行了研究，綜合確定了最佳試驗條件。
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