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Alzheimer’s Disease Stage Classification Using a Deep Transfer Learning and Sparse Auto Encoder Method 被引量:1
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作者 Deepthi K.Oommen J.Arunnehru 《Computers, Materials & Continua》 SCIE EI 2023年第7期793-811,共19页
Alzheimer’s Disease(AD)is a progressive neurological disease.Early diagnosis of this illness using conventional methods is very challenging.Deep Learning(DL)is one of the finest solutions for improving diagnostic pro... Alzheimer’s Disease(AD)is a progressive neurological disease.Early diagnosis of this illness using conventional methods is very challenging.Deep Learning(DL)is one of the finest solutions for improving diagnostic procedures’performance and forecast accuracy.The disease’s widespread distribution and elevated mortality rate demonstrate its significance in the older-onset and younger-onset age groups.In light of research investigations,it is vital to consider age as one of the key criteria when choosing the subjects.The younger subjects are more susceptible to the perishable side than the older onset.The proposed investigation concentrated on the younger onset.The research used deep learning models and neuroimages to diagnose and categorize the disease at its early stages automatically.The proposed work is executed in three steps.The 3D input images must first undergo image pre-processing using Weiner filtering and Contrast Limited Adaptive Histogram Equalization(CLAHE)methods.The Transfer Learning(TL)models extract features,which are subsequently compressed using cascaded Auto Encoders(AE).The final phase entails using a Deep Neural Network(DNN)to classify the phases of AD.The model was trained and tested to classify the five stages of AD.The ensemble ResNet-18 and sparse autoencoder with DNN model achieved an accuracy of 98.54%.The method is compared to state-of-the-art approaches to validate its efficacy and performance. 展开更多
关键词 Alzheimer’s disease mild cognitive impairment Weiner filter contrast limited adaptive histogram equalization transfer learning sparse autoencoder deep neural network
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结合自适应数据增强和集成学习的机载网络入侵检测研究
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作者 周茂辉 刘文琪 +1 位作者 李艳军 宫艺姝 《电信科学》 北大核心 2026年第3期113-122,共10页
机载网络入侵检测可能面临异常样本稀缺和数据分布不平衡的双重挑战,传统方法难以同时保证检测精度和泛化能力。为此,结合多视图对比稀疏自编码器(multi-view contrastive sparse autoencoder,MCSAE)的数据增强方法,提出一种改进分层抽... 机载网络入侵检测可能面临异常样本稀缺和数据分布不平衡的双重挑战,传统方法难以同时保证检测精度和泛化能力。为此,结合多视图对比稀疏自编码器(multi-view contrastive sparse autoencoder,MCSAE)的数据增强方法,提出一种改进分层抽样集成学习的联合优化方法。首先,针对异常样本缺失问题,设计MCSAE,通过多视图数据增强和对比学习策略,在稀疏自编码器框架下学习更具判别性的潜在表示,并利用重输入对比机制优化异常样本生成质量,有效缓解数据稀疏性带来的模型偏差。其次,针对类别不平衡问题,提出改进分层抽样策略,在传统分层抽样基础上引入全局特征保留机制,避免局部采样导致多数类分布失真,确保分类器能够学习数据的完整统计特性。最后,结合F1分数自适应加权集成学习,融合随机森林、长短期记忆(long short-term memory,LSTM)网络等多样化基分类器,动态调整模型权重,进一步提升对少数类攻击的检测能力。实验结果表明,相较于现有方法,所提方法在机载网络数据集上的召回率提升5.2%,F1分数提升3.7%,为复杂网络环境下的入侵检测提供了可靠解决方案。 展开更多
关键词 分布不平衡 多视图对比稀疏自编码器 分层抽样 集成学习
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