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学者姓名：李明爱
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Abstract ：
Decoding motor imagery (MI) using deep learning in cortical level has potential in brain computer interface based intelligent rehabilitation. However, a mass of dipoles is inconvenient to extract the personalized features and requires a more complex neural network. In consideration of the structural and functional similarity of the neurons in a neuroanatomical region, i.e., a region of interest (ROI), we propose that the comprehensive performance of each ROI may be reflected by a specific representative dipole (RD), and the time-frequency spectrums of all RDs are applied simultaneously to Random Forest algorithm to give a quantitative metric of each ROI importance (RI). Then, the more divided sub-band spectral powers are reinforced by RI, and they are interpolated to a 2-dimensional (2D) plane transformed from 3D space of all RDs, yielding an ensemble representation of RD feature image sequences (ERDFIS). Furthermore, a lightweight network, including 2D separable convolution and gated recurrent unit (2DSCG), is developed to extract and classify the frequency-spatial and temporal features from ERDFIS, forming a novel MI decoding method in cortical level (called ERDFIS-2DSCG). Based on two public datasets, the decoding accuracies of ten-fold cross-validation are 89.89% and 94.35%, respectively. The results suggest that RD can embody the overall property of ROI in time-frequency-space domains, and ROI importance is helpful to highlight the subject-based characteristics of MI-EEG. Meanwhile, 2DSCG is matched well with ERDFIS, jointly improving the decoding performance.
Keyword ：
Decoding Decoding Support vector machines Support vector machines Image sequences Image sequences EEG source imaging EEG source imaging Feature extraction Feature extraction motor imagery motor imagery Electroencephalography Electroencephalography Motors Motors Time-frequency analysis Time-frequency analysis Brain computer interface Brain computer interface ROI importance ROI importance separable convolution separable convolution
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| GB/T 7714 | Wang, Linlin , Li, Mingai , Xu, Dongqin et al. Cortical ROI Importance Improves MI Decoding From EEG Using Fused Light Neural Network [J]. | IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING , 2024 , 32 : 3636-3646 . |
| MLA | Wang, Linlin et al. "Cortical ROI Importance Improves MI Decoding From EEG Using Fused Light Neural Network" . | IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING 32 (2024) : 3636-3646 . |
| APA | Wang, Linlin , Li, Mingai , Xu, Dongqin , Yang, Yufei . Cortical ROI Importance Improves MI Decoding From EEG Using Fused Light Neural Network . | IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING , 2024 , 32 , 3636-3646 . |
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Abstract ：
In brain computer interface-based neurorehabilitation system, a large number of electrodes may increase the difficulty of signal acquisition and the time consumption of decoding algorithm for motor imagery EEG (MI-EEG). The traditional electrode optimization methods were limited by the low spatial resolution of scalp EEG. EEG source imaging (ESI) was further applied to reduce the number of electrodes, in which either the electrodes covering activated cortical areas were selected, or the reconstructed electrodes of EEGs with higher Fisher scores were retained. However, the activated dipoles do not all contribute equally to decoding, and the Fisher score cannot represent the correlations between electrodes and dipoles. In this paper, based on ESI and correlation analysis, a novel electrode optimization method, denoted ECCEO, was developed. The scalp MI-EEG was mapped to cortical regions by ESI, and the dipoles with larger amplitudes were chosen to designate a region of interest (ROI). Then, Pearson correlation coefficients between each dipole of the ROI and the corresponding electrode were calculated, averaged, and ranked to obtain two average correlation coefficient sequences. A small but important group of electrodes for each class were alternately added to the predetermined basic electrode set to form a candidate electrode set. Their features were extracted and evaluated to determine the optimal electrode set. Experiments were conducted on two public datasets, the average decoding accuracies achieved 95.99% and 88.30%, and the reduction of computational cost were 65% and 56%, respectively; statistical significance was examined as well.
Keyword ：
EEG source imaging EEG source imaging MI-task decoding MI-task decoding Pearson correlation coefficient Pearson correlation coefficient Electrode optimization Electrode optimization Common spatial patterns Common spatial patterns
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| GB/T 7714 | Dong, Yuxin , Wang, Linlin , Li, Mingai . Applying correlation analysis to electrode optimization in source domain [J]. | MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING , 2023 , 61 (5) : 1225-1238 . |
| MLA | Dong, Yuxin et al. "Applying correlation analysis to electrode optimization in source domain" . | MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING 61 . 5 (2023) : 1225-1238 . |
| APA | Dong, Yuxin , Wang, Linlin , Li, Mingai . Applying correlation analysis to electrode optimization in source domain . | MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING , 2023 , 61 (5) , 1225-1238 . |
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Abstract ：
The complex brain network consists of multiple collaborative regions, which can be activated to varying degrees by motor imagery (MI) and the induced electroencephalogram (EEG) recorded by an array of scalp electrodes is usually decoded for driving rehabilitation system. Either all channels or partially selected channels are equally applied to recognize movement intention, which may be incompatible with the individual differences of channels from different locations. In this paper, a channel importance based imaging method is proposed, denoted as CIBI. For each electrode of MI-EEG, the power over 8-30 Hz band is calculated from discrete Fourier spectrum and input to random forest algorithm (RF) to quantify its contribution, namely channel importance (CI); Then, CI is used for weighting the powers of a and b rhythms, which are interpolated to a 32 x 32 grid by using CloughTocher method respectively, generating two main band images with time-frequency-space information. In addition, a dual branch fusion convolutional neural network (DBFCNN) is developed to match with the characteristic of two MI images, realizing the extraction, fusion and classification of comprehensive features. Extensive experiments are conducted based on two public datasets with four classes of MI-EEG, the relatively higher average accuracies are obtained, and the improvements achieve 23.95% and 25.14% respectively when using channel importance, their statistical analysis are also performed by Kappa value, confusion matrix and receiver operating characteristic. Experiment results show that the personalized channel importance is helpful to enhance inter-class separability as well as the proposed method has the outstanding decoding ability for multiple MI tasks.(c) 2022 Nalecz Institute of Biocybernetics and Biomedical Engineering of the Polish Academy of Sciences. Published by Elsevier B.V. All rights reserved.
Keyword ：
Channel importance Channel importance Brain computer interface Brain computer interface Motor imagery Motor imagery Convolutional neural network Convolutional neural network Random forest algorithm Random forest algorithm
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| GB/T 7714 | Wang, Linlin , Li, Mingai . The quantitative application of channel importance in movement intention decoding [J]. | BIOCYBERNETICS AND BIOMEDICAL ENGINEERING , 2022 , 42 (2) : 630-645 . |
| MLA | Wang, Linlin et al. "The quantitative application of channel importance in movement intention decoding" . | BIOCYBERNETICS AND BIOMEDICAL ENGINEERING 42 . 2 (2022) : 630-645 . |
| APA | Wang, Linlin , Li, Mingai . The quantitative application of channel importance in movement intention decoding . | BIOCYBERNETICS AND BIOMEDICAL ENGINEERING , 2022 , 42 (2) , 630-645 . |
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Abstract ：
Domain adaptation, as an important branch of transfer learning, can be applied to cope with data insufficiency and high subject variabilities in motor imagery electroencephalogram (MI-EEG) based brain-computer interfaces. The existing methods generally focus on aligning data and feature distribution; however, aligning each source domain with the informative samples of the target domain and seeking the most appropriate source domains to enhance the classification effect has not been considered. In this paper, we propose a dual alignment-based multi-source domain adaptation framework, denoted DAMSDAF. Based on continuous wavelet transform, all channels of MI-EEG signals are converted respectively and the generated time-frequency spectrum images are stitched to construct multi-source domains and target domain. Then, the informative samples close to the decision boundary are found in the target domain by using entropy, and they are employed to align and reassign each source domain with normalized mutual information. Furthermore, a multi-branch deep network (MBDN) is designed, and the maximum mean discrepancy is embedded in each branch to realign the specific feature distribution. Each branch is separately trained by an aligned source domain, and all the single branch transfer accuracies are arranged in descending order and utilized for weighted prediction of MBDN. Therefore, the most suitable number of source domains with top weights can be automatically determined. Extensive experiments are conducted based on 3 public MI-EEG datasets. DAMSDAF achieves the classification accuracies of 92.56%, 69.45% and 89.57%, and the statistical analysis is performed by the kappa value and t-test. Experimental results show that DAMSDAF significantly improves the transfer effects compared to the present methods, indicating that dual alignment can sufficiently use the different weighted samples and even source domains at different levels as well as realizing optimal selection of multi-source domains.
Keyword ：
Transfer learning Transfer learning Weighted alignment Weighted alignment Maximum mean discrepancy Maximum mean discrepancy Motor imagery Motor imagery Domain adaptation Domain adaptation
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| GB/T 7714 | Xu, Dong-qin , Li, Ming-ai . A dual alignment-based multi-source domain adaptation framework for motor imagery EEG classification [J]. | APPLIED INTELLIGENCE , 2022 , 53 (9) : 10766-10788 . |
| MLA | Xu, Dong-qin et al. "A dual alignment-based multi-source domain adaptation framework for motor imagery EEG classification" . | APPLIED INTELLIGENCE 53 . 9 (2022) : 10766-10788 . |
| APA | Xu, Dong-qin , Li, Ming-ai . A dual alignment-based multi-source domain adaptation framework for motor imagery EEG classification . | APPLIED INTELLIGENCE , 2022 , 53 (9) , 10766-10788 . |
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Abstract ：
Motor imagery (MI) based brain computer interface significantly oriented the development of neuro-rehabilitation, and the crucial issue is how to accurately detect the changes of cerebral cortex for MI decoding. The brain activity can be calculated based on the head model and observed scalp EEG, providing insights regarding cortical dynamics by using equivalent current dipoles with high spatial and temporal resolution. Now, all the dipoles within entire cortex or partial regions of interest are directly applied to data representation, this may make the key information weakened or lost, and it is worth studying how to choose the most important from numerous dipoles. In this paper, we devote to building a simplified distributed dipoles model (SDDM), which is combined with convolutional neural network (CNN), generating a MI decoding method at source level (called SDDM-CNN). First, all channels of raw MI-EEG signals are subdivided by a series of bandpass filters with width of 1 Hz, the average energies associated with any sub-band signals are calculated and ranked in a descending order to screen the top n sub-bands; then, the MI-EEG signals over each selected sub-band are mapped into source space by using EEG source imaging technology, and for each scout of neuroanatomical Desikan-Killiany partition, a centered dipole is selected as the most relevant dipole and put together to build a SDDM to reflect the neuroelectric activity of entire cerebral cortex; finally, the 4 dimensional (4D) magnitude matrix is constructed for each SDDM and fused into a novel data representation, which is further input to a well-designed 3DCNN with n parallel branches (nB3DCNN) to extract and classify the comprehensive features from time-frequency-space dimensions. Experiments are carried out on three public datasets, and the average ten-fold CV decoding accuracies achieve 95.09%, 97.98% and 94.53% respectively, and the statistical analysis is fulfilled by standard deviation, kappa value and confusion matrix. Experiment results suggest that it is beneficial to pick out the most sensitive sub-bands in sensor domain, and SDDM can sufficiently describe the dynamic changing of entire cortex, improving decoding performance while greatly reducing number of source signals. Also, nB3DCNN is capable of exploring spatial-temporal features from multi sub-bands.
Keyword ：
Convolutional neural network Convolutional neural network EEG source imaging EEG source imaging Simplified distributed dipoles model Simplified distributed dipoles model Motor imagery Motor imagery
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| GB/T 7714 | Li, Ming-ai , Ruan, Zi-wei . Decoding motor imagery with a simplified distributed dipoles model at source level [J]. | COGNITIVE NEURODYNAMICS , 2022 , 17 (2) : 445-457 . |
| MLA | Li, Ming-ai et al. "Decoding motor imagery with a simplified distributed dipoles model at source level" . | COGNITIVE NEURODYNAMICS 17 . 2 (2022) : 445-457 . |
| APA | Li, Ming-ai , Ruan, Zi-wei . Decoding motor imagery with a simplified distributed dipoles model at source level . | COGNITIVE NEURODYNAMICS , 2022 , 17 (2) , 445-457 . |
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Abstract ：
Motor imagery electroencephalogram (MI-EEG) play an important role in the field of neurorehabilitation, and a fuzzy support vector machine (FSVM) is one of the most used classifiers. Specifically, a fuzzy c-means (FCM) algorithm was used to membership calculation to deal with the classification problems with outliers or noises. However, FCM is sensitive to its initial value and easily falls into local optima.The joint optimization of genetic algorithm (GA) and FCM is proposed to enhance robustness of fuzzy memberships to initial cluster centers, yielding an improved FSVM (GF-FSVM).The features of each channel of MI-EEG are extracted by the improved refined composite multivariate multiscale fuzzy entropy and fused to form a feature vector for a trial. Then, GA is employed to optimize the initial cluster center of FCM, and the fuzzy membership degrees are calculated through an iterative process and further applied to classify two-class MI-EEGs.Extensive experiments are conducted on two publicly available datasets, the average recognition accuracies achieve 99.89% and 98.81% and the corresponding kappa values are 0.9978 and 0.9762, respectively.The optimized cluster centers of FCM via GA are almost overlapping, showing great stability, and GF-FSVM obtains higher classification accuracies and higher consistency as well.
Keyword ：
genetic algorithm genetic algorithm joint optimization joint optimization Motor imagery electroencephalogram Motor imagery electroencephalogram fuzzy c-means fuzzy c-means fuzzy support vector machine fuzzy support vector machine
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| GB/T 7714 | Li Ming-Ai , Wang Ruo-Tu , Wei Li-Na . Fuzzy support vector machine with joint optimization of genetic algorithm and fuzzy c-means. [J]. | Technology and health care : official journal of the European Society for Engineering and Medicine , 2021 . |
| MLA | Li Ming-Ai et al. "Fuzzy support vector machine with joint optimization of genetic algorithm and fuzzy c-means." . | Technology and health care : official journal of the European Society for Engineering and Medicine (2021) . |
| APA | Li Ming-Ai , Wang Ruo-Tu , Wei Li-Na . Fuzzy support vector machine with joint optimization of genetic algorithm and fuzzy c-means. . | Technology and health care : official journal of the European Society for Engineering and Medicine , 2021 . |
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Abstract ：
As an important task in scene understanding, semantic segmentation requires a large amount of computation to achieve high performance. In recent years, with the rise of autonomous systems, it is crucial to make a trade-off in terms of accuracy and speed. In this paper, we propose a novel asymmetric encoder-decoder network structure to address this problem. In the encoder, we design a Separable Asymmetric Module, which combines depth-wise separable asymmetric convolution with dilated convolution to greatly reduce computation cost while maintaining accuracy. On the other hand, an attention mechanism is also used in the decoder to further improve segmentation performance. Experimental results on CityScapes and CamVid datasets show that the proposed method can achieve a better balance between segmentation precision and speed compared with state-of-the-art semantic segmentation methods. Specifically, our model obtains mean IoU of 72.5% and 66.3% on CityScapes and CamVid test dataset, respectively, with less than 1M parameters.
Keyword ：
decoder structure decoder structure Dilated convolution Dilated convolution Depth-wise separable asymmetric convolution Depth-wise separable asymmetric convolution Semantic segmentation Semantic segmentation Attention mechanism Attention mechanism Encoder– Encoder–
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| GB/T 7714 | Wang, Kang , Yang, Jinfu , Yuan, Shuai et al. A lightweight network with attention decoder for real-time semantic segmentation [J]. | VISUAL COMPUTER , 2021 , 38 (7) : 2329-2339 . |
| MLA | Wang, Kang et al. "A lightweight network with attention decoder for real-time semantic segmentation" . | VISUAL COMPUTER 38 . 7 (2021) : 2329-2339 . |
| APA | Wang, Kang , Yang, Jinfu , Yuan, Shuai , Li, Mingai . A lightweight network with attention decoder for real-time semantic segmentation . | VISUAL COMPUTER , 2021 , 38 (7) , 2329-2339 . |
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Abstract ：
The breakthrough of electroencephalogram (EEG) signal classification of brain computer interface (BCI) will set off another technological revolution of human computer interaction technology. Because the collected EEG is a type of nonstationary signal with strong randomness, effective feature extraction and data mining techniques are urgently required for EEG classification of BCI. In this paper, the new bionic whale optimization algorithms (WOA) are proposed to promote the improved extreme learning machine (ELM) algorithms for EEG classification of BCI. Two improved WOA-ELM algorithms are designed to compensate for the deficiency of random weight initialization for basic ELM. Firstly, the top several best individuals are selected and voted to make decisions to avoid misjudgment on the best individual. Secondly, the initial connection weights and bias between the input layer nodes and hidden layer nodes are optimized by WOA through bubble-net attacking strategy (BNAS) and shrinking encircling mechanism (SEM), and different regularization mechanisms are introduced in different layers to generate appropriate sparse weight matrix to promote the generalization performance of the algorithm.As shown in the contrast results, the average accuracy of the proposed method can reach 93.67%, which is better than other methods on BCI dataset. © 2013 IEEE.
Keyword ：
Bionics Bionics Machine learning Machine learning Electroencephalography Electroencephalography Brain computer interface Brain computer interface Biomedical signal processing Biomedical signal processing Data mining Data mining Human computer interaction Human computer interaction
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| GB/T 7714 | Lian, Zhaoyang , Duan, Lijuan , Qiao, Yuanhua et al. The Improved ELM Algorithms Optimized by Bionic WOA for EEG Classification of Brain Computer Interface [J]. | IEEE Access , 2021 , 9 : 67405-67416 . |
| MLA | Lian, Zhaoyang et al. "The Improved ELM Algorithms Optimized by Bionic WOA for EEG Classification of Brain Computer Interface" . | IEEE Access 9 (2021) : 67405-67416 . |
| APA | Lian, Zhaoyang , Duan, Lijuan , Qiao, Yuanhua , Chen, Juncheng , Miao, Jun , Li, Mingai . The Improved ELM Algorithms Optimized by Bionic WOA for EEG Classification of Brain Computer Interface . | IEEE Access , 2021 , 9 , 67405-67416 . |
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Abstract ：
Electrooculogram (EOG) is an inevitable main interference in electroencephalogram (EEG) acquisition, which directly affects the analysis and application of EEG. Second-order blind identification (SOBI), as a blind source separation (BSS), has been used to remove the ocular artifacts (OA) of contaminated EEG. However, SOBI that assumes the source signal to be stationary is not appropriate for nonstationary EEG signals, yielding undesirable separation results. In addition, it is regrettable that the current discriminations of ocular artifacts, such as correlation coefficients, sample entropy, do not take into account of the fuzzy characteristics of EEG, which leads to the inaccurate judgement of OA. In this paper, a novel OA removal method is proposed based on the combination of discrete wavelet transform (DWT) and SOBI and denoted as DWSOBI. DWT is used to analyze each channel of contaminated EEG to obtain more stable multi-scale wavelet coefficients; then, the wavelet coefficients in the same layer are selected to construct the wavelet coefficient matrix, and it is further separated by using SOBI to obtain the estimation of source signals, whose fuzzy entropies are calculated and employed to realize the automatic identification and removal of OA. Based on a public database, many experiments are conducted and two performance indexes are adopted to measure the elimination effect of OA. The experiment results show that DWSOBI achieves more adaptive and accurate performance for four kinds of OA from three subjects, and is superior to the commonly used methods. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Keyword ：
Signal reconstruction Signal reconstruction Electroencephalography Electroencephalography Automation Automation Discrete wavelet transforms Discrete wavelet transforms Entropy Entropy Intelligent computing Intelligent computing Blind source separation Blind source separation Signal analysis Signal analysis
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| GB/T 7714 | Li, Mingai , Liu, Fan , Sun, Yanjun et al. An Automatic Removal Method of Ocular Artifacts in EEG [C] . 2021 : 362-371 . |
| MLA | Li, Mingai et al. "An Automatic Removal Method of Ocular Artifacts in EEG" . (2021) : 362-371 . |
| APA | Li, Mingai , Liu, Fan , Sun, Yanjun , Wei, Lina . An Automatic Removal Method of Ocular Artifacts in EEG . (2021) : 362-371 . |
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Abstract ：
本发明公开了偶极子成像与识别方法，采用标准化低分辨率脑电磁断层扫描成像sLORETA算法将经过带通滤波后的头皮层脑电信号逆变换到脑皮层；将四类运动想象任务分成两个两分类任务，计算每个两类任务之间的偶极子幅值差值，将其差异明显的共同时段选取为感兴趣时间TOI，并将TOI内每类任务激活的区域取并集，得到感兴趣区域ROI，提取ROI内偶极子的坐标和幅值；再针对每个离散时间点，通过对偶极子坐标进行平移、放大和取整等操作，并将偶极子幅值赋于到对应的坐标点处，构建二维偶极子成像图，再按照时间维度将二维偶极子成像图堆叠成二维图像序列；最后利用滑动时间窗法进行数据增广，获得三维偶极子特征数据，并输入到三维卷积神经网络3DCNN进行分类。
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| GB/T 7714 | 李明爱 , 刘斌 , 刘有军 et al. 偶极子成像与识别方法 : CN202110058762.7[P]. | 2021-01-16 . |
| MLA | 李明爱 et al. "偶极子成像与识别方法" : CN202110058762.7. | 2021-01-16 . |
| APA | 李明爱 , 刘斌 , 刘有军 , 孙炎珺 . 偶极子成像与识别方法 : CN202110058762.7. | 2021-01-16 . |
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