查询词典 discrete optimization problem

To achieve better results,we make use of the discrete Radon transform and a set of discrete orthogonal Tchebichef polynomials to establish relationship between the projection moments and the image moments,and then estimate the unknown projections from the known projections using this relationship.

提出一种新的投影数据估计算法，利用离散Radon变换和Tchebichef正交多项式建立图像矩和投影矩之间的关系，并用这种关系从已知投影数据中估计未知投影数据，达到提高重建图像质量的目的。

This paper presents a new method to estimate unknown projections. To achieve better results, we make use of the discrete Radon transform and a set of discrete orthogonal Tchebichef polynomials to establish relationship between the projection moments and the image moments, and then estimate the unknown projections from the known projections using this relationship.

提出一种新的投影数据估计算法，利用离散Radon变换和Tchebichef正交多项式建立图像矩和投影矩之间的关系，并用这种关系从已知投影数据中估计未知投影数据，达到提高重建图像质量的目的。

In this dissertation, a semi-discrete method-the discrete method of separation of variables is proposed for solvi...

本文研究求解带奇性的二阶椭圆型方程、复合材料问题及不可压材料问题的离散分离变量法。

In chapter 2, we firstly introduce the model of a discrete-time neural network with generalized input-output function. The model generalizes the input-output function in transiently chaotic neural network to a class of continuous, differentiable and monotone increasing functions. Secondly we study the uniformly asymptotical stability of equilibrium in the non-autonomous model. Finally, several examples and numerical simulations are given to illustrate and reinforce our theories. In chapter 3, we firstly introduce a specific class of discrete-time neural network models with sinusoidal activation function.

在本文的第二章中，首先介绍了一类具有广义输入输出函数的非自治离散神经网络模型，该模型把瞬时混沌神经网络模型中的输入输出函数推广到了一般的单调递增且连续可微的函数；其次，利用Schauder不动点原理和利用Lyapunov函数逆定理依次证明了模型平衡点的存在性和该模型在时变权值下的一致渐近稳定性；最后，对几个具体的例子进行数值模拟，数值模拟的结果更好地说明了我们的结论。

According to the discrete curvature on triangle meshes,more important features can be preserved in regions of high curvature after simplification.A method to get the new vertex after the collapse of a triangle based on discrete curvature and spherical surface estimation is also given.

通过三维扫描仪得到的数据构建的三角网格模型，由于其采样密度均匀，因此造成了数据量庞大，受到存储和传输带宽的限制，使得其很难在实际应用中直接使用。

According to the concept of strain energy of cracked materials, the orientation tensor of crack was defined. Considering the crack-closing and friction between crack surface under compression, The damage tensor, damage strain and effective elastic modulus were formulated. A method for discrete description of damage mechanism was given, and the evolution equation of discrete orientation density of crack was obtained. The relationship of micromechanism and the macro-representation of concrete failure were studied.

从含裂纹材料的变形能出发，引出了裂纹的方位张量；在考虑裂纹受压闭合与滑动摩擦的基础上，给出了损伤张量、损伤应变和有效弹性系数的表达式，在损伤机构离散化方法的基础上，给出了方位密度的演化方程；将上述损伤理论应用于混凝土的损伤分析，研究了混凝土破坏的微观机制与宏观表现的关系及Griffith准则和Mohr-Coulomb准则的相似性问题，对修正的Griffith准则进行了改进。

A nonlinear semi-discrete model of investment dynamic system is set,and the existence and unique of solution for semi-discrete system are discussed.

建立了投资动力系统的一个非线性半离散模型，并讨论了半离散系统解的存在唯一性，给出了线性半离散系统稳定的一些充分条件。

If the filter's input and output signals are discrete-time, then the filter impulse response unit is also bound to be discrete, This filter called digital filter.

若滤波器的输入、输出都是离散时间信号，那么该滤波器的单位冲激响应也必然是离散的，这种滤波器称为数字滤波器。

This course includes (1) Discrete time signal and systems,(2) Z transform,(3) Continuous-time signal sampling,(4) LTI system,(5) Discrete time systems,(6) Filter design,(7) DFT,(8) FFT.

课程内容包含：(1)离散时间信号和系统，(2) z转换，(3)连续时间信号的取样，(4)线性非时变系统的转换分析，(5)离散时间系统的结构，(6)滤波器设计技巧，(7)离散傅氏转换，(8)使用离散傅氏转换以对信号做傅氏分析。

On the basis of the relation, we will prove some useful properties of the discrete Zak transform which lay the foundation for the computation of discrete Gabor transform.

利用连续Zak变换和离散Zak变换的关系，证明了离散Zak变换的一些性质。为进一步研究离散Gabor变换建立了数学基础。

The teacher likes the honeymouthed little girl very much.

老师很喜欢这个嘴甜的小姑娘。

Mr. Notker Bien's interests are traveling, spending quality time with the family and long-distance-running.

诺特卡·柏恩先生热爱旅游，长跑，以及和家人一起共度美好时光。