discrete approximation 中文意思是什麼

discrete approximation 解釋
離散逼近
  • discrete : adj. 1. 分離的，分立的；顯然有別的。2. 不連續的；【數學】離散的；【哲學】抽象的 （opp. concrete）。adv. -ly
  • approximation : n. 1. 接近；近似。2. 【數學】近似值。3. 概算，略計。
  1. A. teel, d. nesic etc. initially studied iss stabilization of nonlinear sample - data systems of this type in 1998. practical stabilization of nonlinear sampled - data systems based on discrete - time approximation with sufficiently small sampling periods has been studied in recent years. the sufficient conditions have been given for the practical st abilization of the above case

    第三部分：在采樣周期固定的條件下，研究基於近似離散化模型上設計的關于參數t一致的漸近穩定采樣控制器能夠以漸近穩定方式一致鎮定其連續受控系統的條件。
  2. Secondly, based on nurbs curves approximation algorithm, a nurbs surface approximation algorithm on discrete data sets is given. thirdly, a shape - preserving parametric surface interpolation to data set is given

    2基於所給的nurbs曲線的逼近演算法，建立了帶插值條件的離散點集的nurbs曲面的逼近演算法。
  3. The nurbs curves and surfaces approximation to constrained data sets is discussed in this dissertation. the major works are as follows : firstly, based on simulated annealing algorithm and least square principle, a nurbs curves approximation algorithm to constrained discrete data sets is presented

    本文討論了帶約束的離散點集的nurbs曲線、曲面的逼近問題，主要工作如下： 1基於模擬退火演算法和最小二乘法，給出了帶插值條件的離散點集的nurbs曲線逼近的演算法。
  4. In our algorithm, we separate out the singly scattered radiation and apply the normal four - stream approximation of stamnes " s discrete - ordinate - method to the multiply scattered radiation alone

    我們將單次散射輻射分離出來單獨求解，對于多次散射，單次散射作為其輻射源，用kuntstamnes的離散縱標法作四流近似計算。
  5. This process is as follows : firstly, the data of different section contour and of section line have been obtained by reverse - engineering ; secondly, non - uniform b - spline approximation algorithm is used to fit the discrete data ; then the data have been optimized and reduced by adopting adaptive sampling of key points of the fitted curve based on vertical distance, sequently the adaptive sampling data is transformed into the format of the. ibl file of the famous 3 - d design software pro / e. therefore we reconstruct the surface and a model is generated ; lastly, the effectiveness of the adopted algorithm and modeling approach are demonstrated by the experiments

    建模型的過程中，首先運用逆向工程測量方法，獲得曲面物體上不同截面輪廓線的測量數據點列，接著對測量數據點進行平滑處理，用最小二乘法求解基於數據點列的控制多邊形，以非均勻三次b樣條曲線擬合截面輪廓曲線；然後利用基於垂距的數據采樣演算法，對擬合曲線上的數據點進行重新采樣，達到優化數據點的分佈及減少描述曲線數據量的目的。
  6. A smoothing technique is combined with optimum approximation and finite element piece - wise interpolation in the method, it can simultaneously process measured vector components, imp ro ve smoothing capability of solution, space composed of original discrete points and increase the accuracy of the solution, especialy its derivatives

    該方法結合最佳逼近、有限元分片插值與光順技巧，對測量向量各獨立分量進行處理，改善了原離散點構成的解空間的光滑性，提高了解尤其是導數場的精度，在測量區域內再現了光順向量函數及連續的導數。
  7. Lastly, aiming at the poor results which all current algorithms do for directional textures, and cannot synthesis texture directly, aiming at the particularity of this kind of textures, we bring forward the conceptions of non frontal parallel textures and frontal parallel textures. by analyzing texture ' s direction through fourier spectrum, we introduce the conception of main direction, and solve the approximation value of texture ' s main direction by discrete approximated approach. by this way, we can synthesis indirectly simple structural non frontal parallel textures

    最後針對現有演算法對帶有方向的紋理合成效果差，無法直接合成紋理圖像的難點，本論文首先提出了非正平行紋理與正平行紋理的概念，分析了它們之間的內在聯系，引入了兩個角度參數來描述紋理的朝向，採用傅立葉頻譜法分析紋理的方向特性，並提出了紋理主方向的概念，本論文引入離散逼近的方法來求解出紋理主方向的近似值，這樣我們就能用一種間接的方法合成簡單的結構性非正平行紋理。
  8. This chapter optimized the algorithm provided by michael garland and paul s. heckbert based on edge contraction, and the improved algorithm can produce better approximation. a new method provided to simplify triangulated model with appearance attributes, and optimized the method to reduce the complexity in chapter 3. the dissertation advances a new concept : density of meshes, and study the applications of density of meshes in discrete multi - resolution and continuous multi - resolution

    第二章介紹了garland等提出的基於頂點對折疊的簡化演算法，指出了該演算法的一個缺陷並給出了解決方法；將garland的演算法應用到了具有一定屬性的面片上，分析擴展之後演算法的計算復雜度，提出了決解復雜度的方法；第三章節給出了一種新的自動遞進網格演算法，可以實現無二義性，快速恢復等功能；此節提出了一個新的概念：網格密度。
  9. It is important to find a precise and fast algorithm for solar radiative transfer in the atmosphere. in this paper, we present, based on stamnes " s discrete - ordinate - method, an analytical four - stream approximation algorithm

    我們在knutstamnes的離散縱標法（ 1988 ）的基礎之上，提出了一種輻射傳輸四流近似計算方法，並且該演算法可以得到一個解析解。
  10. Wavelet analysis have many advantages over discrete fourier transform by zoom - in and zoom - out capability. wavelet denoising in multi resolution approximation has been evolved to become very powerful tools for digital picture signal processing

    去噪處理已成為研究重點。小波多解析度逼近分析去噪已發展成為圖像處理的一個重要而有效的工具。
  11. Based on the reynolds " lubrication approximation, and utilizing the small parameter method, the velocity and the pressure equations for two spheres translating normally and tangentially with an interstitial second - order fluid are derived for modeling wet granular assembles using the discrete element method. as a result, analytical solution for the tangential force and the torque were obtained

    採用reynolds潤滑理論和小參數法等研究了存在填隙二階流體時兩球法向及切向運動時的運動，位移及壓力分佈規律，從而求出擠壓力或切向阻力、阻力矩的解析解。
  12. The long time behavior of fully discrete fourier spectral approximation for nonlinear schr dinger equation with quintic term

    方程全離散譜格式的大時間性態
  13. It can be seen from the temporal behavior of the three aquifers that hillslopes with a larger inclination react significantly quicker to the re - charge input and tend tend to drain faster than nearly hori - zontal aquifers. this is caused by the increasing it can therefore be estimated using a finite differ - ence approximation, ststttntlqsnt where t is a discrete change in time. so the subsurface runoff parameterization with wa - ter storage and recharge based on the boussinesq - storage equation is founded

    很顯然對于同樣的入滲強度，地下徑流深隨著坡度的增大而變化明顯，這裏面關science in china ser . d earth sciences第4期? ?田向軍等:基於boussinesq - storage方程同時考慮水分儲存和入滲的地下徑流機制379圖2模型參數的敏感性鍵的原因在於隨著坡度的增大，重力的因素起到了更大的作用
  14. In this article, we will discuss the ways of how to get their stable numerical solutions, in which the continous and discrete regularization method, with and without knowing the error level 6 of input data, are presented and a regularization strategy based on linear approximation for identifying the nonlinear source term is also given

    本文將討論獲得其穩定數值解的計算方法，包括在原始數據的誤差水平已知和未知情況下的連續正則化與離散正則化方法以及識別非線性源項的基於線性逼近的正則化策略等。
  15. The related problem of how to construct the finite dimensional approximation of the integral operator by using radial basis functions, formulate the discrete euler ' s equation with its trigonaliza - tion, fastly realize the rules of selecting the regularization parameter are discussed

    文中討論了利用徑向基函數作積分運算元的有限維逼近，離散euler方程的形成及其三對角化，以及在此形式下的各種選擇正則參數準則的快速實現等問題。
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