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Bearing Fault Diagnosis Based on Deep Discriminative Adversarial Domain Adaptation Neural Networks
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作者 Jinxi Guo Kai Chen +5 位作者 Jiehui Liu Yuhao Ma Jie Wu Yaochun Wu Xiaofeng Xue Jianshen Li 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第3期2619-2640,共22页
Intelligent diagnosis driven by big data for mechanical fault is an important means to ensure the safe operation ofequipment. In these methods, deep learning-based machinery fault diagnosis approaches have received in... Intelligent diagnosis driven by big data for mechanical fault is an important means to ensure the safe operation ofequipment. In these methods, deep learning-based machinery fault diagnosis approaches have received increasingattention and achieved some results. It might lead to insufficient performance for using transfer learning alone andcause misclassification of target samples for domain bias when building deep models to learn domain-invariantfeatures. To address the above problems, a deep discriminative adversarial domain adaptation neural networkfor the bearing fault diagnosis model is proposed (DDADAN). In this method, the raw vibration data are firstlyconverted into frequency domain data by Fast Fourier Transform, and an improved deep convolutional neuralnetwork with wide first-layer kernels is used as a feature extractor to extract deep fault features. Then, domaininvariant features are learned from the fault data with correlation alignment-based domain adversarial training.Furthermore, to enhance the discriminative property of features, discriminative feature learning is embeddedinto this network to make the features compact, as well as separable between classes within the class. Finally, theperformance and anti-noise capability of the proposedmethod are evaluated using two sets of bearing fault datasets.The results demonstrate that the proposed method is capable of handling domain offset caused by differentworkingconditions and maintaining more than 97.53% accuracy on various transfer tasks. Furthermore, the proposedmethod can achieve high diagnostic accuracy under varying noise levels. 展开更多
关键词 Fault diagnosis transfer learning domain adaptation discriminative feature learning correlation alignment
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A new constrained maximum margin approach to discriminative learning of Bayesian classifiers 被引量:1
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作者 Ke GUO Xia-bi LIU +2 位作者 Lun-hao GUO Zong-jie LI Zeng-min GENG 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2018年第5期639-650,共12页
We propose a novel discriminative learning approach for Bayesian pattern classification, called 'constrained maximum margin (CMM)'. We define the margin between two classes as the difference between the minimum de... We propose a novel discriminative learning approach for Bayesian pattern classification, called 'constrained maximum margin (CMM)'. We define the margin between two classes as the difference between the minimum decision value for positive samples and the maximum decision value for negative samples. The learning problem is to maximize the margin under the con- straint that each training pattern is classified correctly. This nonlinear programming problem is solved using the sequential un- constrained minimization technique. We applied the proposed CMM approach to learn Bayesian classifiers based on Gaussian mixture models, and conducted the experiments on 10 UCI datasets. The performance of our approach was compared with those of the expectation-maximization algorithm, the support vector machine, and other state-of-the-art approaches. The experimental results demonstrated the effectiveness of our approach. 展开更多
关键词 discriminative learning Statistical modeling Bayesian pattern classifiers Gaussian mixture models UCI datasets
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Discriminative Learning with Scale Decomposition for Person Detection
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作者 WANG Xiao CHEN Jun +1 位作者 LIANG Chao HU Ruimin 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2020年第4期337-342,共6页
Person detection,which can locate the person regions in the image,continues to be a hot research topic in both computer vision and signal processing communities.However,detecting person at small scale remains a challe... Person detection,which can locate the person regions in the image,continues to be a hot research topic in both computer vision and signal processing communities.However,detecting person at small scale remains a challenging problem due to the lack of discriminative details in the typical image at small scale.In this paper,we propose a decomposition mapping method which contains two subnets:encoder subnet and decoder subnet.Encoder subnet can exploit decomposition transformation for person regions from big scale to small scale.Decoder subnet reverses the process of the encoder subnet.We add deconvolution network to the decoder subnet to make up for the lost information and a discriminative mapping has been restructured to transform the person regions from the small scale to the big scale.Therefore,person-regions and background-regions can then be separated according to their decomposition positions in the new scale space.The proposed approach is evaluated on two challenging person datasets:Caltech dataset and the KITTI dataset.Compared with SAF R-CNN,the miss rate has been optimized by 3.96%on Caltech person dataset and the mean average precision has been optimized by 1.76%on KITTI person dataset. 展开更多
关键词 discriminative learning scale decomposition person detection
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Unsupervised Domain Adaptation Based on Discriminative Subspace Learning for Cross-Project Defect Prediction 被引量:1
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作者 Ying Sun Yanfei Sun +4 位作者 Jin Qi Fei Wu Xiao-Yuan Jing Yu Xue Zixin Shen 《Computers, Materials & Continua》 SCIE EI 2021年第9期3373-3389,共17页
:Cross-project defect prediction(CPDP)aims to predict the defects on target project by using a prediction model built on source projects.The main problem in CPDP is the huge distribution gap between the source project... :Cross-project defect prediction(CPDP)aims to predict the defects on target project by using a prediction model built on source projects.The main problem in CPDP is the huge distribution gap between the source project and the target project,which prevents the prediction model from performing well.Most existing methods overlook the class discrimination of the learned features.Seeking an effective transferable model from the source project to the target project for CPDP is challenging.In this paper,we propose an unsupervised domain adaptation based on the discriminative subspace learning(DSL)approach for CPDP.DSL treats the data from two projects as being from two domains and maps the data into a common feature space.It employs crossdomain alignment with discriminative information from different projects to reduce the distribution difference of the data between different projects and incorporates the class discriminative information.Specifically,DSL first utilizes subspace learning based domain adaptation to reduce the distribution gap of data between different projects.Then,it makes full use of the class label information of the source project and transfers the discrimination ability of the source project to the target project in the common space.Comprehensive experiments on five projects verify that DSL can build an effective prediction model and improve the performance over the related competing methods by at least 7.10%and 11.08%in terms of G-measure and AUC. 展开更多
关键词 Cross-project defect prediction discriminative subspace learning unsupervised domain adaptation
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Multi-task Joint Sparse Representation Classification Based on Fisher Discrimination Dictionary Learning 被引量:6
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作者 Rui Wang Miaomiao Shen +1 位作者 Yanping Li Samuel Gomes 《Computers, Materials & Continua》 SCIE EI 2018年第10期25-48,共24页
Recently,sparse representation classification(SRC)and fisher discrimination dictionary learning(FDDL)methods have emerged as important methods for vehicle classification.In this paper,inspired by recent breakthroughs ... Recently,sparse representation classification(SRC)and fisher discrimination dictionary learning(FDDL)methods have emerged as important methods for vehicle classification.In this paper,inspired by recent breakthroughs of discrimination dictionary learning approach and multi-task joint covariate selection,we focus on the problem of vehicle classification in real-world applications by formulating it as a multi-task joint sparse representation model based on fisher discrimination dictionary learning to merge the strength of multiple features among multiple sensors.To improve the classification accuracy in complex scenes,we develop a new method,called multi-task joint sparse representation classification based on fisher discrimination dictionary learning,for vehicle classification.In our proposed method,the acoustic and seismic sensor data sets are captured to measure the same physical event simultaneously by multiple heterogeneous sensors and the multi-dimensional frequency spectrum features of sensors data are extracted using Mel frequency cepstral coefficients(MFCC).Moreover,we extend our model to handle sparse environmental noise.We experimentally demonstrate the benefits of joint information fusion based on fisher discrimination dictionary learning from different sensors in vehicle classification tasks. 展开更多
关键词 Multi-sensor fusion fisher discrimination dictionary learning(FDDL) vehicle classification sensor networks sparse representation classification(SRC)
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Tensor discriminant dictionary classification method for prestack seismic reflection patterns
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作者 Cai Han-Peng Jing Peng Yang Jun-Hui 《Applied Geophysics》 SCIE CSCD 2022年第2期197-208,307,共13页
The existing seismic reflection pattern classification methods need to convert multidimensional prestack seismic data into one-dimensional vectors for processing,which loses the characteristics of amplitude variation ... The existing seismic reflection pattern classification methods need to convert multidimensional prestack seismic data into one-dimensional vectors for processing,which loses the characteristics of amplitude variation with offset/azimuth in the prestack seismic data.In this study,a tensor discriminant dictionary learning method for classifying prestack seismic reflection patterns is proposed.The method is initially based on the tensor Tucker decomposition algorithm and uses a tensor form to characterize the prestack seismic data with multidimensional features.The tensor discriminant dictionary is then used to reduce the influence of noise on the sample features.Finally,the method uses the Pearson correlation coefficient to measure the correlation degree of the sparse representation coefficients of different types of tensors.The advantages of the new method are as follows.(1)It can retain the rich structural features in different dimensions in the prestack data.(2)It adjusts the threshold of the Pearson correlation coefficient to optimize the classification effect.(3)It fully uses drilling information and expert knowledge and performs calibration training of the sample labels.The numerical-model tests confirm that the new method is more accurate and robust than the traditional support vector machine and K-nearest neighbor classification algorithms.The application of actual data further confirms that the classification results of the new method agree with the geological patterns and are more suitable for the analysis and interpretation of sedimentary facies. 展开更多
关键词 Prestack seismic data seismic reflection pattern analysis TENSORS discriminative dictionary learning
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Latent discriminative representation learning for speaker recognition
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作者 Duolin HUANG Qirong MAO +3 位作者 Zhongchen MA Zhishen ZHENG Sidheswar ROUTRYAR Elias-Nii-Noi OCQUAYE 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2021年第5期697-708,共12页
Extracting discriminative speaker-specific representations from speech signals and transforming them into fixed length vectors are key steps in speaker identification and verification systems.In this study,we propose ... Extracting discriminative speaker-specific representations from speech signals and transforming them into fixed length vectors are key steps in speaker identification and verification systems.In this study,we propose a latent discriminative representation learning method for speaker recognition.We mean that the learned representations in this study are not only discriminative but also relevant.Specifically,we introduce an additional speaker embedded lookup table to explore the relevance between different utterances from the same speaker.Moreover,a reconstruction constraint intended to learn a linear mapping matrix is introduced to make representation discriminative.Experimental results demonstrate that the proposed method outperforms state-of-the-art methods based on the Apollo dataset used in the Fearless Steps Challenge in INTERSPEECH2019 and the TIMIT dataset. 展开更多
关键词 Speaker recognition Latent discriminative representation learning Speaker embedding lookup table Linear mapping matrix
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Joint global constraint and Fisher discrimination based multi-layer dictionary learning for image classification
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作者 Peng Hong Liu Yaozong 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2023年第5期1-10,共10页
A multi-layer dictionary learning algorithm that joints global constraints and Fisher discrimination(JGCFD-MDL)for image classification tasks was proposed.The algorithm reveals the manifold structure of the data by le... A multi-layer dictionary learning algorithm that joints global constraints and Fisher discrimination(JGCFD-MDL)for image classification tasks was proposed.The algorithm reveals the manifold structure of the data by learning the global constraint dictionary and introduces the Fisher discriminative constraint dictionary to minimize the intra-class dispersion of samples and increase the inter-class dispersion.To further quantify the abstract features that characterize the data,a multi-layer dictionary learning framework is constructed to obtain high-level complex semantic structures and improve image classification performance.Finally,the algorithm is verified on the multi-label dataset of court costumes in the Ming Dynasty and Qing Dynasty,and better performance is obtained.Experiments show that compared with the local similarity algorithm,the average precision is improved by 3.34%.Compared with the single-layer dictionary learning algorithm,the one-error is improved by 1.00%,and the average precision is improved by 0.54%.Experiments also show that it has better performance on general datasets. 展开更多
关键词 global similarity Fisher discrimination joint local-constraint and Fisher discrimination based dictionary learning(JLCFDDL) joint global constraint and Fisher discrimination based multi-layer dictionary learning image classification
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Robust Speech Recognition Method Based on Discriminative Environment Feature Extraction 被引量:2
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作者 韩纪庆 高文 《Journal of Computer Science & Technology》 SCIE EI CSCD 2001年第5期458-464,共7页
It is an effective approach to learn the influence of environmental parameters, such as additive noise and channel distortions, from training data for robust speech recognition. Most of the previous methods are based ... It is an effective approach to learn the influence of environmental parameters, such as additive noise and channel distortions, from training data for robust speech recognition. Most of the previous methods are based on maximum likelihood estimation criterion. However, these methods do not lead to a minimum error rate result. In this paper, a novel discrimina-tive learning method of environmental parameters, which is based on Minimum Classification Error (MCE) criterion, is proposed. In the method, a simple classifier and the Generalized Probabilistic Descent (GPD) algorithm are adopted to iteratively learn the environmental pa-rameters. Consequently, the clean speech features are estimated from the noisy speech features with the estimated environmental parameters, and then the estimations of clean speech features are utilized in the back-end HMM classifier. Experiments show that the best error rate reduction of 32.1% is obtained, tested on a task of 18 isolated confusion Korean words, relative to a conventional HMM system. 展开更多
关键词 robust speech recognition minimum classification error environmental parameter discriminative learning
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DIAGNOSIS WITHOUT DISCRIMINATION
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作者 Li Fangfang 《Beijing Review》 2016年第50期12-15,共4页
While medical care has improved,more education is needed to end bias and make the battle against HIV/AIDS more effective His 27th birthday was a dark milepost in Wang Bing’s life.On that day,Wang learned he was HIV p... While medical care has improved,more education is needed to end bias and make the battle against HIV/AIDS more effective His 27th birthday was a dark milepost in Wang Bing’s life.On that day,Wang learned he was HIV positive and he had been infected through unprotected sex."It hit me like a ton of bricks," 展开更多
关键词 battle birthday learned infected bricks discrimination awareness doctor medication antiretroviral
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