网络结构

The relationship between the topology and convegence of networks is approached and the reason causing overtraining and overfitting is analysed. Then the redundant weights and nodes in the network are defined by using improved activity function and a new algorithm called the BPNSO for determining the network structure for any application is proposed, which use dual optimization objective function combining the mean squre error of the network output with network complexity penalty function.

文章对网络拓扑结构与网络收敛性和稳定性的关系进行了探讨，分析了网络出现Overtraining或Overfitting的原因和解决的目标，提出了神经网络结构优化的策略，改进了活化函数，定义了冗余权值和冗余节点的概念，为辨识和删除冗余权值和冗余节点，提出采用优化目标函数中增加网络复杂度罚函数的双重优化目标函数，并对罚因子提出了基于学习误差和权值的自适应动态调整公式，论文定义了这种BP网络结构优化方法为BPNSO，并给出了完整的计算流程。

The designed network is not only parsimonious but also has better generalization performance.

该算法一方面优化了网络结构，使网络结构尽可能的精简，另一方面有效地提高了网络的推广能力。

The idea of provincialism of artificial neural network is introduced to describe the structural difference of various kinds of ANN.

从网络结构入手，提出了网络局域性的概念，作为网络结构的一种定量描述，探讨了网络结构与网络训练速度、预测精度间的对应关系。

Thus a new structural reliability measure to measure the uniformness of the network, which is called Network Structural Para-Entropy , is given in this thesis.

于是本文中我们给出一个度量网络结构均匀性的结构可靠性测度，我们将其称为网络结构类熵。

An approach of Radial Basis Function Neural Network optimization based on support vector machine was proposed to solve the randomness of the network structure and the unstableness of the network's performance.

为了解决径向基网络结构设计的随机性，进一步优化RBF网络性能，提出一种基于支持向量机的径向基网络结构优化方法。

A Multi-Species Cooperative PSO algorithm is developed using the ideas of species dividing in the bionomical world. The algorithm is shown to have guaranteed convergence to the global optimum. Furthermore, the training strategies of RBF network structures and weights based on the MCPSO aigorithm is proposed. Simulation results show that the algorithm is effective in such fields as chaotic time-sequence forecasting, system identification, speech signal processing and etc.

在分析基本微粒群算法和协同微粒群算法特点的基础上，借鉴生态学中的种群划分思想，设计出一种多种群协同进化微粒群算法，并分析了该算法的收敛性能；在分析径向基函数神经网络结构的基础上，提出了基于多种群协同进化微粒群算法的径向基函数神经网络结构和权值优化设计策略，并在混沌序列预测、系统辨识、语音信号处理等应用仿真实验中验证了算法的有效性。

ICCs in these domain appeared as a network structure. On the contrary, the number of ICCs was significantly decreased or even disappeared in between the muscle layers of the ganglionic segment in HD.

结果：在对照组及巨结肠扩张段，ICCs大量分布在肌间神经丛周围及环肌层内，并形成网络结构在狭窄段，肠壁各层ICCs细胞密度明显减少甚至消失，正常所见的网络结构遭到破坏。

Taking the significance of knowledge ineconomic growth in to account,it is necessary to establish a network includinggovernments at all levels,knowledge-generating sectors,knowledge-transmittingsectors,material-transforming sectors and consumer groups.

国家经济体系网络结构中的五个要素相互作用、相互影响，国家经济体系网络结构构成一个有机的整体。国家经济体系的运行机制包括市场机制和计划机制，二者都是必要的。

The process of establishing neural network is as follows: input parameters of network are selected from thickness, preheat temperature, heat input, welding position and sampling point, output parameter of network is impact ductility CVN, two-layer neuronic network configuration, S-type active function and back-propagation learning algorithm are selected.

文章摘要：采用VC语言实现了X70管线钢环焊接头冲击韧性与环焊工艺之间神经网络结构的建立过程，将壁厚、预热温度、线能量、焊接位置、取样位置作为结构的输入，将环焊接头的CVN值作为结构的输出，选择了具有2层神经元的神经网络结构和S型激活函数及BP学习算法。

The network structure is significant in characterizing the performance of the feedforward network, such as network capacity, learning speed, generalization ability Standard back propagation performs gradient descent only in the weight space of a network with fixed topology, in general, it is useful only when the network architecture is chosen correctly With a bad structure we potentially run into problems like underfitting, overfitting or wasting computational resources, so algorithms than can find an appropriate network architecture automatically are highly attractive.

神经网络的结构对于前向网络的特性有重要的影响，如网络容量，学习速度，泛化能力等。标准BP算法是针对网络结构是固定的情况下搜索权值，一般来说，这只能在网络结构被正确选取才有用。如果网络结构不当，我们可能会欠拟合、过拟合或浪费计算资源，因此如果能找到能自动选取网络结构的算法是很有吸引力的。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。