When employing penetration ammunition to strike multi-story buildings,the detection methods using acceleration sensors suffer from signal aliasing,while magnetic detection methods are susceptible to interference from ...When employing penetration ammunition to strike multi-story buildings,the detection methods using acceleration sensors suffer from signal aliasing,while magnetic detection methods are susceptible to interference from ferromagnetic materials,thereby posing challenges in accurately determining the number of layers.To address this issue,this research proposes a layer counting method for penetration fuze that incorporates multi-source information fusion,utilizing both the temporal convolutional network(TCN)and the long short-term memory(LSTM)recurrent network.By leveraging the strengths of these two network structures,the method extracts temporal and high-dimensional features from the multi-source physical field during the penetration process,establishing a relationship between the multi-source physical field and the distance between the fuze and the target plate.A simulation model is developed to simulate the overload and magnetic field of a projectile penetrating multiple layers of target plates,capturing the multi-source physical field signals and their patterns during the penetration process.The analysis reveals that the proposed multi-source fusion layer counting method reduces errors by 60% and 50% compared to single overload layer counting and single magnetic anomaly signal layer counting,respectively.The model's predictive performance is evaluated under various operating conditions,including different ratios of added noise to random sample positions,penetration speeds,and spacing between target plates.The maximum errors in fuze penetration time predicted by the three modes are 0.08 ms,0.12 ms,and 0.16 ms,respectively,confirming the robustness of the proposed model.Moreover,the model's predictions indicate that the fitting degree for large interlayer spacings is superior to that for small interlayer spacings due to the influence of stress waves.展开更多
生成对抗网络常常被用于图像着色、语义合成、风格迁移等图像转换任务,但现阶段图像生成模型的训练往往依赖于大量配对的数据集,且只能实现两个图像域之间的转换。针对以上问题,提出了一种基于生成对抗网络的时尚内容和风格迁移模型(con...生成对抗网络常常被用于图像着色、语义合成、风格迁移等图像转换任务,但现阶段图像生成模型的训练往往依赖于大量配对的数据集,且只能实现两个图像域之间的转换。针对以上问题,提出了一种基于生成对抗网络的时尚内容和风格迁移模型(content and style transfer based on generative adversarial network,CS-GAN)。该模型利用对比学习框架最大化时尚单品与生成图像之间的互信息,可保证在时尚单品结构不变的前提下实现内容迁移;通过层一致性动态卷积方法,针对不同风格图像自适应地学习风格特征,实现时尚单品任意风格迁移,对输入的时尚单品进行内容特征(如颜色、纹理)和风格特征(如莫奈风、立体派)的融合,实现多个图像域的转换。在公开的时尚数据集上进行对比实验和结果分析,该方法与其他主流方法相比,在图像合成质量、Inception score和FID距离评价指标上均有所提升。展开更多
使用计算模型对图像进行自动描述属于视觉高层理解,要求模型不仅能够对图像中的目标及场景进行描述,而且能够对目标与目标之间、目标与场景之间的关系进行表达,同时能够生成符合一定语法和结构的自然语言句子.目前基于深度卷积神经网络(...使用计算模型对图像进行自动描述属于视觉高层理解,要求模型不仅能够对图像中的目标及场景进行描述,而且能够对目标与目标之间、目标与场景之间的关系进行表达,同时能够生成符合一定语法和结构的自然语言句子.目前基于深度卷积神经网络(Convolutional neural network,CNN)和长短时记忆网络(Long-short term memory,LSTM)的方法已成为解决该问题的主流,虽然已取得巨大进展,但存在LSTM层次不深,难以优化的问题,导致模型性能难以提升,生成的描述句子质量不高.针对这一问题,受深度学习思想的启发,本文设计了基于逐层优化的多目标优化及多层概率融合的LSTM(Multi-objective layer-wise optimization/multi-layer probability fusion LSTM,MLO/MLPF-LSTM)模型.模型中首先使用浅层LSTM进行训练,收敛之后,保留原LSTM模型中的分类层及目标函数,并添加新的LSTM层及目标函数重新对模型进行训练,对模型原有参数进行微调;在测试时,将多个分类层使用Softmax函数进行变换,得到每层对单词的预测概率分值,然后将多层的概率分值进行加权融合,得到单词的最终预测概率.在MSCOCO和Flickr30K两个数据集上实验结果显示,该模型性能显著,在多个统计指标上均超过了同类其他方法.展开更多
文摘When employing penetration ammunition to strike multi-story buildings,the detection methods using acceleration sensors suffer from signal aliasing,while magnetic detection methods are susceptible to interference from ferromagnetic materials,thereby posing challenges in accurately determining the number of layers.To address this issue,this research proposes a layer counting method for penetration fuze that incorporates multi-source information fusion,utilizing both the temporal convolutional network(TCN)and the long short-term memory(LSTM)recurrent network.By leveraging the strengths of these two network structures,the method extracts temporal and high-dimensional features from the multi-source physical field during the penetration process,establishing a relationship between the multi-source physical field and the distance between the fuze and the target plate.A simulation model is developed to simulate the overload and magnetic field of a projectile penetrating multiple layers of target plates,capturing the multi-source physical field signals and their patterns during the penetration process.The analysis reveals that the proposed multi-source fusion layer counting method reduces errors by 60% and 50% compared to single overload layer counting and single magnetic anomaly signal layer counting,respectively.The model's predictive performance is evaluated under various operating conditions,including different ratios of added noise to random sample positions,penetration speeds,and spacing between target plates.The maximum errors in fuze penetration time predicted by the three modes are 0.08 ms,0.12 ms,and 0.16 ms,respectively,confirming the robustness of the proposed model.Moreover,the model's predictions indicate that the fitting degree for large interlayer spacings is superior to that for small interlayer spacings due to the influence of stress waves.
文摘生成对抗网络常常被用于图像着色、语义合成、风格迁移等图像转换任务,但现阶段图像生成模型的训练往往依赖于大量配对的数据集,且只能实现两个图像域之间的转换。针对以上问题,提出了一种基于生成对抗网络的时尚内容和风格迁移模型(content and style transfer based on generative adversarial network,CS-GAN)。该模型利用对比学习框架最大化时尚单品与生成图像之间的互信息,可保证在时尚单品结构不变的前提下实现内容迁移;通过层一致性动态卷积方法,针对不同风格图像自适应地学习风格特征,实现时尚单品任意风格迁移,对输入的时尚单品进行内容特征(如颜色、纹理)和风格特征(如莫奈风、立体派)的融合,实现多个图像域的转换。在公开的时尚数据集上进行对比实验和结果分析,该方法与其他主流方法相比,在图像合成质量、Inception score和FID距离评价指标上均有所提升。
文摘使用计算模型对图像进行自动描述属于视觉高层理解,要求模型不仅能够对图像中的目标及场景进行描述,而且能够对目标与目标之间、目标与场景之间的关系进行表达,同时能够生成符合一定语法和结构的自然语言句子.目前基于深度卷积神经网络(Convolutional neural network,CNN)和长短时记忆网络(Long-short term memory,LSTM)的方法已成为解决该问题的主流,虽然已取得巨大进展,但存在LSTM层次不深,难以优化的问题,导致模型性能难以提升,生成的描述句子质量不高.针对这一问题,受深度学习思想的启发,本文设计了基于逐层优化的多目标优化及多层概率融合的LSTM(Multi-objective layer-wise optimization/multi-layer probability fusion LSTM,MLO/MLPF-LSTM)模型.模型中首先使用浅层LSTM进行训练,收敛之后,保留原LSTM模型中的分类层及目标函数,并添加新的LSTM层及目标函数重新对模型进行训练,对模型原有参数进行微调;在测试时,将多个分类层使用Softmax函数进行变换,得到每层对单词的预测概率分值,然后将多层的概率分值进行加权融合,得到单词的最终预测概率.在MSCOCO和Flickr30K两个数据集上实验结果显示,该模型性能显著,在多个统计指标上均超过了同类其他方法.
