查询词典 BP

There are some disadvantages in BP algorithm, such as low rate of convergence, easily falling into local minimum point and weak global search capability. In order to settle these problems, a genetic algorithm was used to train BP neural network to replace classical learning algorithms. An evolutionary neural network learning algorithm was founded.

针对BP算法存在收敛速度慢、容易陷入局部极小值及全局搜索能力弱等缺陷，采用遗传算法训练BP神经网络，取代了一些传统的学习算法，设计了基于进化神经网络的学习算法。

BP neural network based on adaptive UKF is introduced in this paper for the standard BP neural network has slow converges, local minimum value and weak generalization ability.

针对BP神经网络收敛速度慢、容易陷入局部极小值点和泛化能力差等问题，基于自适应Kalman滤波理论，提出一种自适应非线性滤波训练BP神经网络的方法。

Focusing on the disadvantages in the BP neural network such as low convergence rate,easily falling into local minimum point and weak global search capability,a new method that used GA to train BP neural networks to gain best weights was presented.

针对传统的BP算法存在收敛速度比较慢、容易陷入局部极小值以及全局搜索能力弱等缺陷，提出了神经网络与遗传算法。结合的方法，采用遗传算法。练BP神经网络，优化网络权值。

Japonicus used in this experimentation is matemal inheritance.5 Sequence analysis of mitochondrial 16S rRNA and COI gene and molecular phylogeny of four species of sea cucumber500 bp 16S rRNA and 540 bp COI fragment were obtained by PCR method from mitochondrial DNA of four species of sea cucumber, Apostichopus japonicus, Holothuria fuscogilva, Cucumaria frondosa and Mensamaria intercedens. Variable sites, nucleotide diversity, average number of nucleotide differences and average number of nucleotide substitutions per site were calculated to analyze sequence difference, and phylogenetic trees were constructed by the NJ and ME method.

结果显示在来自这5组家系的100个后代中仅检测到母本的单倍型，刺参的线粒体遗传模式表现为典型的母系遗传。5 4种海参16S rRNA和COI基因片段序列比较及系统学研究采用PCR技术对山东荣成、长岛、俄罗斯和日本的刺参，黄乳海参，北大西洋瓜参，二色桌片参的16S rRNA和COI基因片段进行了扩增和测序，分别得到了长度约为500 bp和540 bp的片段。

The design of transplanter for rice growing in cupulate tray is the critical link in rice growing in cupulate tray technology,the design method is not mature,for exploring a new design method,having discussed neural network s serviceability in agriculture machinery mechanism design with the theoretical basis of self-organizing feature mapand the back-propagation network,the integrated SOM-BP nerve network model is applied in the field of transplanter s critical mechanism design for rice growing,al...

水稻钵育栽植机的设计是实现水稻钵育栽培技术的关键环节，区别于传统的水稻栽植机其关键部件的设计方法还不成熟，在理论研究方面还不完善。为探索新的设计方法，论述了神经网络算法对农业机械设计的适用性，以自组织特征映射网络SOM 和误差反向传播网络BP为理论基础，将SOM-BP集成神经网络模型应用于水稻钵育栽植机关键部件设计领域，建立神经网络模型，通过集成网络训练，得到设计结果。验证了SOM-BP神经网络在农业机械机设计中的正确性和精确性。

By sequencing, we found that ITS1 and ITS2 length of Desmodium sequax is 225 bp and 197 bp.

经过定序之后，得到波叶山蚂蝗的ITS1序列长度为225 bp， ITS2序列长度为197 bp。

We deduce frondose algorithm of three layers BP neuralnetworks which is used in common, and discuss several important issues in designing neural networks which is used to forecast, for example, number of hidden layer, nerve cell number of hidden layer, epoch of learning, embryonic power value, decision of node number about input and outputo At the same time, this dissertation sums up things that conventional BP algorithm is improved on considering disadvantages of it.

推导了常用的三层BP神经网络具体算法，讨论了实际预测应用中神经网络设计方面的几个重要问题，如隐层数、隐层神经元数、训练次数、初始权值、输入节点数以及输出节点数的确定。同时，针对传统BP算法存在的各种各样的缺点，文中综述了对其改进的情况。

This paper advances a Fast BP algorithm. It accords to the system error to adjust learning speed. By procasting cotton heliothis armigera, we made a compare to these two kinds BP algorithm's convergence speed.

本文在对BP网络现行算法研究的基础上，提出根据系统误差自适应调节学习率的快速BP算法，并以棉花棉铃虫预测为例，对两种算法的收敛速度进行了比较。

Results The complete 16800 bp mtDNA was separated from both samples, and the Cytb gene with 310 bp segments was amplified by PCR and the sequence indicated that the homologous similarity was 99% with sable Martes zibellina L.(GenBank: AB026109.1) and it was 45% with other animal similarity.

结果：新鲜的貂心和肝组织提取出16 800 bp的mtDNA，并能扩增出310 bp大小的Cytb基因，测序结果显示貂心Cytb基因与美洲貂(GenBank AB026109.1)同源性为99%。

RESULTS: The common MELAS mutations were not found in this case, but a 276-bp deletion was detected in the mitochondrial DNA between 3 314 bp and 3 589 bp.

结果：患者不存在能引起MELAS的较常见的突变，但在线粒体3314～3589之间有276 bp的碱基缺失。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。