global approximation 中文意思是什麼

global approximation 解釋
整體近似
  • global : adj. 1. 球面的，球狀的；全球的。2. 世界的。3. 總體的，普遍的，綜合的。adv. -ly
  • approximation : n. 1. 接近；近似。2. 【數學】近似值。3. 概算，略計。
  1. By the polygonal approximation method, a global approximation solution is constructed for the initial - boundary value problem of nonconvex scalar conservation laws with two - side boundary effect, and its convergence to the global weak entropy solution of the corresponding problem is proved

    摘要使用折線逼近法，對具有兩條邊界影響的非凸單個守恆律初邊值問題構造了整體近似解，並證明其收斂到初邊值問題的整體弱熵解。
  2. A global convergent inexact successive approximation method for mix complementarity problems

    混合互補問題非精確逐次逼近法的全局收斂性
  3. Firstly, samples are determined by experimental design methods and size optimization of the structures corresponding to the samples is executed with nastran. secondly, an approximation model ( surrogate model ) based on the samples is derived using kriging method. thirdly, the optimal locations of structural elements are found by genetic algorithms ( ga ) because genetic algorithms can find global optimal solutions of surrogate model easily

    基本思路是利用試驗設計法選取樣本點，並對樣本點對應的結構進行尺寸優化，然後根據樣本點和優化結果建立代理模型，再利用遺傳演算法求出設計變量最優解，進而得到結構最優解。
  4. Up to now, the method, we used in studying the properties of collective multipole excitations of nuclei, treat the continuum by a discretization procedure with expanding wave functions in a harmonic oscillator basis. this approximation can be justified for very narrow resonances and gives a global description of the contributions from the continuum. a complete treatment of the continuum can be carried out by the continuum rrpa with a green " s function method

    為了解決這些問題，需要改進相對論無規位相近似方法對z連續態的處理，採用連續相對論無規位相近似計算，通過格林函數方法可以嚴格處理連續態在核的集體激發中的貢獻，並用來描述核的集體巨共振性質，包括核的巨共振能量、巨共振峰的強度以及巨共振寬度等重要的物理量。
  5. Absorbing the idea of the reference [ 3 ] and based on paper [ 2 ], the approximation theories of the global and pointwise of r + s order derivatives are obtained in the first part ; in the second part, the inequality of stechkin - marchaud type of generalized baskakov is studied

    第一節吸收[ 3 ]的思想，在[ 2 ]的基礎上得到了廣義baskakov運算元r + s階導數的點態和整體的逼近定理；第二節研究了廣義baskakov運算元的stechkin ? marchaud型不等式。
  6. Global b - spline approximation of given data points

    樣條曲線逼近
  7. Control systems in modern automatic engineering are nonlinear, time - changed and indefinite. lt is difficult to model by traditional method, even sometime impossible. under these circumstances we should apply model identification to gain the approximate model of object for effective control, there are many models to be chosen, fuzzy model is one of them, it is put forward with the development of fuzzy control. fuzzy model has characteristics of general approximation and strong nonlinear, it is fit for describing complex, nonlinear systems. to avoid rules expansion when the number of input values are very big. in this paper we apply hierarchical fuzzy model to resolve this problem, we also illustrate it has general approximation to any nonlinear systems. genetic algorithm is a algorithm to help find the best parameters of process. lt has abilities of global optimizing and implicit parallel, it can be generally used for all applications. in our paper we use fuzzy model as predictive model and apply ga to identify fuzzy model ( including hierarchical fuzzy model ), we made experiments to nonlinear predictive systems and got very good results. the paper contains chapters as below : chapter 1 preface

    現代控制工程中的系統多表現為非線性、時變和不確定性，採用傳統的建模方法比較困難，或者根本無法實現，在這種情況下，要實現有效的控制，必須採用模型辨識的方法來獲取對象的近似模型，並加以控制，目前用於系統辨識的模型種類很多，模糊模型是其中的一種，它隨著模糊控制的發展而被人提出，模糊模型具有萬能逼近和強非線性的特點，比較適合於描述復雜非線性系統，為了解決模糊模型在輸入變量較多時規則數膨脹的問題，文中引入遞階型模糊模型，並引證這種結構的通用逼近特性。遺傳演算法是模擬自然界生物進化「優勝劣汰」原理的一種參數尋優演算法，它具有隱含并行性和全局最優化的能力，並且對尋優對象的要求比較低，在工程應用和科學研究中，得到了廣泛的應用，本文將遺傳演算法引入模糊模型的辨識，取得了很好的效果。
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