With the rapid development of the Internet globally since the 21st century,the amount of data information has increased exponentially.Data helps improve people’s livelihood and working conditions,as well as learning ...With the rapid development of the Internet globally since the 21st century,the amount of data information has increased exponentially.Data helps improve people’s livelihood and working conditions,as well as learning efficiency.Therefore,data extraction,analysis,and processing have become a hot issue for people from all walks of life.Traditional recommendation algorithm still has some problems,such as inaccuracy,less diversity,and low performance.To solve these problems and improve the accuracy and variety of the recommendation algorithms,the research combines the convolutional neural networks(CNN)and the attention model to design a recommendation algorithm based on the neural network framework.Through the text convolutional network,the input layer in CNN has transformed into two channels:static ones and non-static ones.Meanwhile,the self-attention system focuses on the system so that data can be better processed and the accuracy of feature extraction becomes higher.The recommendation algorithm combines CNN and attention system and divides the embedding layer into user information feature embedding and data name feature extraction embedding.It obtains data name features through a convolution kernel.Finally,the top pooling layer obtains the length vector.The attention system layer obtains the characteristics of the data type.Experimental results show that the proposed recommendation algorithm that combines CNN and the attention system can perform better in data extraction than the traditional CNN algorithm and other recommendation algorithms that are popular at the present stage.The proposed algorithm shows excellent accuracy and robustness.展开更多
摘要针对高速铁路路基挡墙结构在长期服役中受荷载-环境耦合作用产生的损伤难以及时识别的问题,本文提出一种结合小波包变换与卷积神经网络(Convolutional Neural Network,CNN)的智能损伤识别方法。首先,基于室内缩尺模型试验,模拟了不同裂缝位置、裂缝宽度及列车动荷载条件下的挡墙运行状态,采集了结构的加速度动力响应信号。其次,利用小波包变换对非平稳振动信号进行多尺度分解,重构并计算各频段能量分布,构建了归一化的小波包能量特征向量。最后,构建了融合多头注意力机制的CNN深度学习模型,自适应挖掘特征向量与结构损伤状态之间复杂的非线性映射关系。研究结果表明:挡墙的动力响应及能量分布与激振频率及轴重密切相关;所提方法能有效克服噪声干扰,测试集总体识别准确率达80.2%,宏平均AUC(Area Under Curve)值为0.937,在不同损伤程度的分类识别上表现出优异的泛化能力,为高铁路基支挡结构的健康监测提供了可靠的技术支撑。
摘要With the rapid development of the Internet globally since the 21st century,the amount of data information has increased exponentially.Data helps improve people’s livelihood and working conditions,as well as learning efficiency.Therefore,data extraction,analysis,and processing have become a hot issue for people from all walks of life.Traditional recommendation algorithm still has some problems,such as inaccuracy,less diversity,and low performance.To solve these problems and improve the accuracy and variety of the recommendation algorithms,the research combines the convolutional neural networks(CNN)and the attention model to design a recommendation algorithm based on the neural network framework.Through the text convolutional network,the input layer in CNN has transformed into two channels:static ones and non-static ones.Meanwhile,the self-attention system focuses on the system so that data can be better processed and the accuracy of feature extraction becomes higher.The recommendation algorithm combines CNN and attention system and divides the embedding layer into user information feature embedding and data name feature extraction embedding.It obtains data name features through a convolution kernel.Finally,the top pooling layer obtains the length vector.The attention system layer obtains the characteristics of the data type.Experimental results show that the proposed recommendation algorithm that combines CNN and the attention system can perform better in data extraction than the traditional CNN algorithm and other recommendation algorithms that are popular at the present stage.The proposed algorithm shows excellent accuracy and robustness.