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考虑样本分布不均衡的电力系统暂态稳定自适应评估
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作者 姬凯旋 乔骥 +3 位作者 赵紫璇 赵津蔓 史梦洁 杨帆 《电网技术》 北大核心 2025年第6期2302-2310,I0031-I0033,共12页
数据驱动的暂态稳定评估方法能快速准确评估电力系统稳定性,但在小样本或弱样本情况下,仍然面临数据不均衡和泛化能力不足的问题。为了解决该问题,该文提出了一种联合生成对抗图网络(graph networks,GAGN)与主动迁移学习的暂态稳定自适... 数据驱动的暂态稳定评估方法能快速准确评估电力系统稳定性,但在小样本或弱样本情况下,仍然面临数据不均衡和泛化能力不足的问题。为了解决该问题,该文提出了一种联合生成对抗图网络(graph networks,GAGN)与主动迁移学习的暂态稳定自适应评估框架。针对电力系统中样本分布的不均衡性,该文设计了一种基于生成对抗图网络的数据增强算法,将电力系统中各元件状态量及其拓扑关联关系构建为图数据,并通过生成器和图注意力判别器的协作,生成失稳数据辅助模型训练,有效提高模型对不均衡样本辨识的准确率。为了增强模型在新场景下的泛化能力,实现模型快速更新,该文提出一种主动迁移学习策略,用于更新模型参数。通过熵不确定性方法挑选高质量样本,并通过微调更新模型参数。在IEEE 39节点系统上验证了所提方法的有效性和实用性,在提高模型适应性的同时降低了更新成本。 展开更多
关键词 暂态稳定评估 生成对抗图网络 主动学习 迁移学习
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Underwater Image Enhancement Based on Multi-scale Adversarial Network
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作者 ZENG Jun-yang SI Zhan-jun 《印刷与数字媒体技术研究》 CAS 北大核心 2024年第5期70-77,共8页
In this study,an underwater image enhancement method based on multi-scale adversarial network was proposed to solve the problem of detail blur and color distortion in underwater images.Firstly,the local features of ea... In this study,an underwater image enhancement method based on multi-scale adversarial network was proposed to solve the problem of detail blur and color distortion in underwater images.Firstly,the local features of each layer were enhanced into the global features by the proposed residual dense block,which ensured that the generated images retain more details.Secondly,a multi-scale structure was adopted to extract multi-scale semantic features of the original images.Finally,the features obtained from the dual channels were fused by an adaptive fusion module to further optimize the features.The discriminant network adopted the structure of the Markov discriminator.In addition,by constructing mean square error,structural similarity,and perceived color loss function,the generated image is consistent with the reference image in structure,color,and content.The experimental results showed that the enhanced underwater image deblurring effect of the proposed algorithm was good and the problem of underwater image color bias was effectively improved.In both subjective and objective evaluation indexes,the experimental results of the proposed algorithm are better than those of the comparison algorithm. 展开更多
关键词 Underwater image enhancement Generative adversarial network Multi-scale feature extraction Residual dense block
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Gait recognition based on Wasserstein generating adversarial image inpainting network 被引量:4
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作者 XIA Li-min WANG Hao GUO Wei-ting 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第10期2759-2770,共12页
Aiming at the problem of small area human occlusion in gait recognition,a method based on generating adversarial image inpainting network was proposed which can generate a context consistent image for gait occlusion a... Aiming at the problem of small area human occlusion in gait recognition,a method based on generating adversarial image inpainting network was proposed which can generate a context consistent image for gait occlusion area.In order to reduce the effect of noise on feature extraction,the stacked automatic encoder with robustness was used.In order to improve the ability of gait classification,the sparse coding was used to express and classify the gait features.Experiments results showed the effectiveness of the proposed method in comparison with other state-of-the-art methods on the public databases CASIA-B and TUM-GAID for gait recognition. 展开更多
关键词 gait recognition image inpainting generating adversarial network stacking automatic encoder
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