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Modeling experiments on real SAR images demonstrate that the heavy-tailed distributions based on the generalized central limit theorem can accurately describe the sharp-peaked and heavy-tailed statistics of high-resolution SAR images.

真实SAR图像的建模实例表明,基于广义中心极限定理的拖尾分布可以精确描述高分辨率SAR图像的尖峰和厚尾的统计特征。

During the modeling of approximate sequence, a generalized autoregressive conditional heteroscedasticity model, to which the exogenous variables are added, is built to form GARCHX model to avoid the defect of traditional time sequence model that the external impacting factors are neglected.

建立考虑异方差的广义自回归条件异方差模型(generalized autoregressive conditional heteroscedasticity,GARCH)对概貌序列建模,并在GARCH模型中加入外生变量形成GARCHX模型,以弥补传统时间序列模型忽略外界影响的缺陷。

The dissertation focuses on performance gradient estimation and SRO algorithm of DES aswell as other related topics,such as modeling of DES and discrete event simulation,performancemeasure Hessian matrix estimation,Stochastic Approximationand so on.General Semi-Markov Processis adapted to describe behaviour of DES and discrete eventsimulation.A general result is obtained and applied to analyze strong consistency of performancegradient Perturbation Analysisestimator.Conditions for effectiveness of InfinitesimalPerturbation Analysisare also discussed.New PA algorithms,such as server PA,PA usingDirac generalized function,job sequence PA etc.,are proposed to deal with discreteparameters.Furthermore,strategies of combining PA algorithms with certain iterative rules areanalyzed widely in order to optimize DES parameters and some SRO algorithms are constructed toslove DES optimization problems.

论文将DES性能分析领域中性能梯度估计和单运行仿真优化作为主要的研究对象,探讨了与性能梯度估计有关的DES和离散事件仿真过程建模、高阶导数估计以及随机逼近等理论和方法;建立了具有一般性的DES和离散事件仿真的广义半Markov过程模型;获得了分析性能梯度估计量强相合性的理论结果和无穷小摄动分析算法应用的条件;提出了诸如服务台数目的摄动分析、奇异摄动分析、串联生产线和加工车间中工件加工序的摄动分析等一系列摄动的思想和算法,对连续参数和离散参数都进行了深入的研究;对摄动分析算法同优化规则结合实现仿真优化的策略也进行了广泛的分析,构造了新型的变界截尾的随机逼近算法,并用于DES的单运行仿真优化研究;最后,给出了DES性能分析方法的实证性研究结果。

It is one of the important characters of the grey system theory to utilize grey generation modeling. The basis structures of generating space in AGO and in IAGO are respectively obtained by the mathematical research of r-AGO series and r-IAGO series. The results are the following: the coherent and direct expression of the generating basis vector in AGO and r-AGO, the relation expression between two r-AGO series and two r-IAGO series, the relation among generating basis vector, generating series and moving operator.

利用灰色生成建模是灰色系统理论的重要特点之一,通过对r次生成序列(包含r-AGO序列和r-IAGO序列)的数学研究,得到了AGO生成空间和IAGO生成空间的基本结构:AGO和r-AGO生成基向量的统一的直观表达式、任意两个r-AGO序列间与任意两个r-IAGO序列间的关系式、生成基向量生成序列与移动算子间的关系。

Geopotential modeling is one of the most active research field in physical geodesy.

全球重力场模型是当今物理大地测量学最为活跃的研究领域之一。

In the practice of the geodetic data modeling, the cases are as follows

大地测量数据建模实践中应用递归数据结构的场合主要有

Tectono-thermal evolution modeling based on geodynamics methods is an important method for studying sedimentary basin′s thermal history.

基于地球动力学的构造-热演化方法是沉积盆地热史研究的重要方法之一。

General Hydrology Comments and Questions; Water Resources Conferences and Hydrology Training; Developing Country Water Resources Issues; Groundwater, Ground Water, Hydrogeology, and Geohydrology; Groundwater, Surface Water, Watershed and Geochemical Modeling; Surface Water, Watershed Hydrology, Glaciology and Limnology; Innovative Water Pollution Cleanup Technologies

伊拉克水资源;水文学工作;新成果、新模型软件、新水文学教材;水文学建议与问题;水资源会议和水文学培训;发展中国家水资源问题;地下水、水文地质学、地下水文学;地下水、地表水、流域和地球化学模型;地表水、流域水文学、冰河学和湖沼学;水污染治理创新技术

One of key research issues in Reverse Engineering is the geometric modeling of complex surface. Extracting boundary of complex surface from ",points cloud", is a main step.

复杂曲面零件表面的几何模型构造是反求工程的研究重点之一,根据零件表面的数字化数据提取零件表面的边界是构造零件几何模型的关键步骤。

With recent advances in 3D scanning and modeling techniques,there has been a rapid increase in the availability and size of geometric datasets.Large-scale and complex scenes consisting of hundreds of millions of primitives are becoming increasingly common in many graphics applications.

随着近几年三维扫描和建模技术的飞速发展,三维场景的规模和复杂度不断增大,大规模复杂场景的交互绘制受到了国内外研究者越来越多的重视并取得了一系列研究成果。

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She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

Several theories about reigniting and extinguishing of the arc have been refered.

本文综合考虑了几种电弧重燃和熄灭理论。