查询词典 BP

The genetic algorithm pays attention to unknown area search . It has high speed and relative low precision. It will not get into local extremum. The BP algorithm searches the area that include whole-space minimum. It can improve speed and recision.

遗传BP算法利用遗传算法进行全局搜索，注重搜索未知区域，处理速度快而对精度要求不高，不易陷入局部极小点，而利用BP算法搜索有最优点的区域，提高搜索速度和精度。

In this paper, the forecast model of scouring depth is conducted by neural network and BP neural networks.

利用神经网络和一些实测数据建立BP神经网络模型，进行冲刷深度的预测，用收集到的桥墩局部冲刷数据样本训练并测试BP神经网络模型。

In allusion to the complexity in developing a strict dynamic mechanism model of distillation column and the trouble in applying the mechanism model, an optimal BP algorithm combined with conjugate gradient and self adaptive variable step is proposed, and a predicting model of distillation column is built.

针对建立精馏塔严格动态机理模型的复杂性以及机理模型应用的诸多不便，提出了一种综合共轭梯度和自适应变步长的优化BP算法，并利用该优化BP算法建立了精馏塔的预测模型。

Aiming at the disadvantage of conventional BP neural network, such as selecting parameter values by the empirical method, slow convergence speed and easy trap into local minimum points, this paper designs an improved BP neural network system. In order to improve the network convergence rate and reduce the training error, this paper optimizes the initial connecting weight value of neural network by the use of ant colony algorithm and trains artificial neural network by Levenberg-Marquardt algorithm.

针对常规BP神经网络参数的经验式取值方法以及收敛速度慢，容易陷入局部最小点等缺陷，设计了一种改进的神经网络系统，利用蚁群算法优化神经网络连接权初值，并采用LM算法对人工神经网络进行训练，提高了网络的收敛速度，降低了训练误差。

HPLC-MS data should be supplemented to the HPLC fingerprint information for a secondary peak matching.BP artificial neural network is then constructed by MATLAB 5.3 to recognize the fingerprints of Epimedium Brevicornum by the pattern recognition model based on the fingerprints of TCM. The model discriminates 5 categories of crude Epimedium Brevicornum from each other successfully.Inspired by the success of blended wine, attempts are made for the first time to simulate the trueborn crude Epimedium Brevicornum by blending the crude Epimedium Brevicornum of various sources.

针对指纹图谱相似度评价的不足，初步探讨了BP人工神经网络在中药指纹图谱模式识别中的应用；结果表明，基于matlab5.3编程建立的BP网络模式识别模型能将5个类别的淫羊藿药材准确区分开来，预测率满意，可以作为相似度评价的补充；同时进行了网络结构的考察，确定了隐含层最佳节点数。

Results We obtained 739 bp in 26S rDNA Dl-D3 sequence. Differences in 4 basic sites of 739 bp were shown between AVL and Amomum longiligulare T.

测序得到的26S rDNA D1-D3序列为739 bp，阳春砂与海南砂在该区域存在4个碱基位点的差异。

Results show that Pb enrichment factors varied from 1.0～1.8 in the cultural layers, and were not quite high. However, with the history going on from the Dawenkou Culture to the Longshan Culture, the Pb enrichment factor displayed an obvious rising trend, which indicated that the Pb in the cultural layers was probably associated with the development of metallurgic activities in the middle stage of the primitive society. From 5 050 cal a BP to 4 000 cal a BP, China underwent Stone Age, Chalcolithic Age and Bronze Age in sequence. Pb dust in the atmosphere increased with intensifying utilization of copper resources, which was probably the main cause of the rising enrichment factor in the cultural layers.

但是随着时间的推移，从大汶口文化到龙山文化，Pb的富集系数有明显逐步上升的趋势，表明遗址剖面中的Pb很可能与原始社会中期发展起来的冶金活动有关。5 050～4 000 cal a BP间，中国先后经历了石器时代、铜石并用时代，到最后进入青铜时代，这个过程中铜资源利用越来越多导致产生的大气粉尘铅越来越多，很可能是YC1剖面中Pb富集系数逐步增长的主要原因。

These findings suggest that expressing Ist most effectively improves the structural stability of BPs to electrotonic loads and the BP ability to drive the ventricle.

这些发现提示表达Ist能最有效的改善BP对电紧张负荷的的结构稳定性和BP驱动心室的能力。

Aiming at the major influencing factor of the logistics cost of coal enterprise as well as the non-linear characteristic of the coal enterprise logistics cost and the superiority that the neural network has in the solution of complex nonlinear system question, propos to use the BP neural network to do the forecasting of the logistics cost, establishs the forecast model of the logistics cost and do simulation and forecasting by frondose dates, the result indicates the precision of this forecast method is high, the convergent rate is quick, is one feasible forecast method.

重点针对影响煤炭企业物流成本的因素以及煤炭企业物流成本所具有的非线性特点和神经网络在解决复杂非线性系统问题方面所具有的优势，提出了采用BP神经网络来进行物流成本预测的方法。建立了基于BP神经网络的物流成本预测模型并应用具体数据对模型进行了模拟和预测，结果表明该方法预测精度高，是一种实际可行的预测方法。

With the guide of non-linear program theory, by using interpolative steps and inexact line search, an improved conjugate gradient method was found, by which the training rate of BP networks increases by tens or hundreds of times. Moreover, the improved method is effective to solve non-linear equations for which Newton's method does not converge owing to the problems of the quadratic derivative and inverse matrix.

通过大量的数值模拟试验发现，在非线性规划理论的指导下采用间插步骤和不精确的一维搜索技术改进的共轭梯度法，是基于梯度和共轭方向的连续搜索算法中最有效的算法，这种算法使BP网络的训练速度提高几十到几百倍，使BP网络的实际应用效果大为改善；而且这种算法对于用牛顿法由于求二阶导数和求逆矩阵等问题难于收敛的非线性方程组的求解也是很有效的。

James, son of Zebedee, and John the brother of James, whom he named Boanerges, that is, sons of thunder

载伯德的儿子雅各伯和雅各伯的弟弟若望，并为他们起名叫"波纳尔革"，就是"雷霆之子"

The southern Hungarian university city of Szeged will host part of the project, amounting to 40 percent of the total investment, which will mostly be paid for through Hungary's EU structural funds.

位于塞格德南部的匈牙利大学将负责部分项目，总计占总投入资金的40%。大部分资金将由匈牙利的欧盟结构基金会支付。