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针对人工神经网络 BP 模型在实际应用中会遇到一些问题。该文指出了 BP 神经网络模型结构和算法的一些不足,并针对 BP网络模型算法存在的局部极小问题、BP 网络学习速度较慢以及 BP 模型网络结构训练过度和降低网络归纳能力等问题提出了引入规则、选择激发函数和转换函数、采用隐含神经元以及改变网络拓扑结构等一些改进措施,对于提高 BP 模型在实际应用中的效果具有重要意义。通过实际应用,证明了改进后的算法是行之有效的。 相似文献
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应用弹性波理论研究不同的空心Si纳米球弱耦合到半无限长的基底上在微扰近似下的振动态密度,结果发现在低频下耦合空心球的振动模有明显的展宽和改变.通过求解声子传播函数的Dyson方程得到空心球的振动态密度,并进一步研究了空心球的热力学性质. 相似文献
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Soliton structures in the (1+1)-dimensional Ginzburg–Landau equation with a parity-time-symmetric potential in ultrafast optics 下载免费PDF全文
In this paper, the(1+1)-dimensional variable-coefficient complex Ginzburg–Landau(CGL) equation with a paritytime(PT) symmetric potential U(x) is investigated. Although the CGL equations with a PT-symmetric potential are less reported analytically, the analytic solutions for the CGL equation are obtained with the bilinear method in this paper. Via the derived solutions, some soliton structures are presented with corresponding parameters, and the influences of them are analyzed and studied. The single-soliton structure is numerically verified, and its stability is analyzed against additive and multiplicative noises. In particular, we study the soliton dynamics under the impact of the PT-symmetric potential. Results show that the PT-symmetric potential plays an important role for obtaining soliton structures in ultrafast optics, and we can design fiber lasers and all-optical switches depending on the different amplitudes of soliton-like structures. 相似文献
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In optical systems,it is necessary to investigate the propagation of optical solitons in optical fiber systems for fiber-optic communications.By means of the bilinear method,we obtain the two-soliton solution of the variable coefficient higher-order coupled nonlinear Schrodinger equation.According to the obtained two-soliton solution,a novel two-soliton interaction structure of the system is constructed,and their interactions are studied.Two optical solitons occur with elastic interaction under ... 相似文献
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对用力敏传感器测量液体表面张力系数仪器进行研究,重新设计了吊环,便于吊环的水平调节,对待侧液体表面均匀下降的方法和实验装置做了重新设计,减小了实验误差,同时增加了待测液体的变温控制,能够精确测量液体表面张力系数与温度的关系,扩充了实验内容. 相似文献
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