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Multimodal collaborative BCI system based on the improved CSP feature extraction algorithm

Virtual Reality & Intelligent Hardware 2022年第1期4卷 22-37页

作者： Cunbo LI Ning LI Yuan QIU yueheng peng Yifeng WANG Lili DENG Teng MA Fali LI Dezhong YAO peng XU The Clinical Hospital of Chengdu Brain Science Institute MOE Key Lab for Neuroinformation and School of Life Science and TechnologyUniversity of Electronic Science and Technology of ChinaChengdu 610054China School of Intelligent Engineering Zhengzhou University of AeronauticsZhengzhou 450015China

Background As a novel approach for people to directly communicate with an external device,the study of brain-computer interfaces(BCIs)has become ***,similar to the real-world scenario,where individuals are expected to work in groups,the BCI systems should be able to replicate group *** We proposed a 4-order cumulants feature extraction method(CUM4-CSP)based on the common spatial patterns(CSP)*** experiments conducted using motion visual evoked potentials(mVEP)EEG data verified the robustness of the proposed *** addition,to freely choose paradigms,we adopted the mVEP and steady-state visual evoked potential(SSVEP)paradigms and designed a multimodal collaborative BCI system based on the proposed CUM4-CSP *** feasibility of the proposed multimodal collaborative system framework was demonstrated using a multiplayer game controlling system that simultaneously facilitates the coordination and competitive control of two users on external *** verify the robustness of the proposed scheme,we recruited 30 subjects to conduct online game control experiments,and the results were statistically *** The simulation results prove that the proposed CUM4-CSP algorithm has good noise *** online experimental results indicate that the subjects could reliably perform the game confrontation operation with the selected BCI *** The proposed CUM4-CSP algorithm can effectively extract features from EEG data in a noisy ***,the proposed scheme may provide a new solution for EEG-based group BCI research.

关键词： Collaborative brain-computer interface(BCI) Motion visual evoked potentials(mVEP) Steady-state visual evoked potential(SSVEP) Game controlling system

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Transcriptomic and Macroscopic Architectures of Multimodal Covariance Network Reveal Molecular–Structural–Functional Co-alterations

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Research 2024年第1期2023卷 471-487页

作者： Lin Jiang yueheng peng Runyang He Qingqing Yang Chanlin Yi Yuqin Li Bin Zhu Yajing Si Tao Zhang Bharat B.Biswal Dezhong Yao Lan Xiong Fali Li peng Xu The Clinical Hospital of Chengdu Brain Science Institute MOE Key Lab for NeuroinformationUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Life Science and Technology Center for Information in BioMedicineUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Psychology Xinxiang Medical UniversityXinxiang 453003China School of Science Xihua UniversityChengdu 610039China Department of Biomedical Engineering New Jersey Institute of TechnologyNewarkNJUSA School of Electrical Engineering Zhengzhou UniversityZhengzhou 450001China Research Unit of NeuroInformation Chinese Academy of Medical Sciences2019RU035ChengduChina Montreal Neurological Institute and Hospital McGill UniversityMontrealQCCanada Department of Electrical and Computer Engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina Radiation Oncology Key Laboratory of Sichuan Province 610041 ChengduChina Rehabilitation Center Qilu Hospital of Shandong UniversityJinan 250012China

Human cognition is usually underpinned by intrinsic structure and functional neural co-activation in spatially distributed brain *** to lacking an effective approach to quantifying the covarying of structure and functional responses,how the structural–functional circuits interact and how genes encode the relationships,to deepen our knowledge of human cognition and disease,are still ***,we propose a multimodal covariance network(MCN)construction approach to capture interregional covarying of the structural skeleton and transient functional activities for a single *** further explored the potential association between brain-wide gene expression patterns and structural–functional covarying in individuals involved in a gambling task and individuals with major depression disorder(MDD),adopting multimodal data from a publicly available human brain transcriptomic atlas and 2 independent *** analysis showed a replicable cortical structural–functional fine map in healthy individuals,and the expression of cognition-and disease phenotype-related genes was found to be spatially correlated with the corresponding MCN *** analysis of cell type-specific signature genes suggests that the excitatory and inhibitory neuron transcriptomic changes could account for most of the observed correlation with task-evoked MCN differences.

关键词： alterations evoked spatially

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基于概率稀疏自注意力神经网络的重性抑郁疾患诊断

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计算机应用 2024年第9期44卷 2970-2974页

作者：秦璟秦志光李发礼彭悦恒电子科技大学信息与软件工程学院成都610054 电子科技大学生命科学与技术学院成都610054

抑郁症的诊断主要依赖于医师的咨询和量表评估等主观方法,可能导致误诊。脑电图(EEG)具有高时间分辨率、低成本、易于设置和无创等优点,因此可以用作精神障碍(如抑郁症)的定量测量工具。深度学习算法目前在EEG信号上有多种应用,其中就... 详细信息

抑郁症的诊断主要依赖于医师的咨询和量表评估等主观方法,可能导致误诊。脑电图(EEG)具有高时间分辨率、低成本、易于设置和无创等优点,因此可以用作精神障碍(如抑郁症)的定量测量工具。深度学习算法目前在EEG信号上有多种应用,其中就包括抑郁症的诊断和分类。EGG信号在通过自注意力机制处理时有大量的冗余部分,因此,提出一种基于概率稀疏自注意力机制的卷积神经网络(PSANet)。首先,根据采样因数在自注意力机制中选取少量最关键的注意力点,在运用自注意力机制的同时克服它计算成本高的缺点,使它可以在脑电长序列数据上应用;同时将脑电图与患者的生理量表进行嵌合,从而进行多维度诊断。在一个包含抑郁症患者和健康对照组的数据集上进行实验评估,实验结果表明,PSANet表现出较高的分类准确性,参数量也低于EEGNet等对比方法。

关键词：抑郁症诊断脑电图深度学习自注意力机制卷积神经网络

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Optimizing distribution of multiple tuned mass dampers for building structures with inverse element exchange method

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 187-199页

作者： peng-Tai Chan Department of Marine Environment and Engineering Sun Yat-sen University(NSYSU)Kaohsiung 804TaiwanChina

Multiple tuned mass dampers(MTMDs)reduce dynamic response with multiple specified frequencies of building *** optimization algorithms for placement design exist,though they rarely conform to code-based verification nor produce high quality solutions without high computational effort and high *** study proposes an inverse element exchange method(IEEM)with multi-level programming and compares it to a single tuned mass damper(STMD)and uniform distribution of multiple tuned mass dampers in the frequency and time domains.A ten-story shear building is used for the numerical case *** results show that the proposed method can offer improvement over the STMD,uniform distribution of multiple tuned mass dampers,and distribution optimized by genetic algorithms(GA)with regard to minimizing the interstory drift ratio(IDR)in both the frequency and time domains and the time consumption for optimization.

关键词： tuned mass damper multiple tuned mass damper optimal damper placement design transfer function

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Evaluation of ERA5 reanalysis temperature data over the Qilian Mountains of China

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Journal of Mountain Science 2025年第1期22卷 198-209页

作者： ZHAO peng HE Zhibin School of Computer Science Huainan Normal UniversityHuainan 232038China Linze Inland River Basin Research Station Key Laboratory of Inland River Basin ScienceNorthwest Institute of Eco-Environment and ResourceChinese Academy of SciencesLanzhou 730000China

Air temperature is an important indicator to analyze climate change in mountainous ***5 reanalysis air temperature data are important products that were widely used to analyze temperature change in mountainous ***,the reliability of ERA5 reanalysis air temperature over the Qilian Mountains(QLM)is *** this study,we evaluated the reliability of ERA5 monthly averaged reanalysis 2 m air temperature data using the observations at 17 meteorological stations in the QLM from 1979 to *** results showed that:ERA5 reanalysis monthly averaged air temperature data have a good applicability in the QLM in general(R2=0.99).ERA5 reanalysis temperature data overestimated the observed temperature in the QLM in *** mean square error(RMSE)increases with the increasing of elevation range,showing that the reliability of ERA5 reanalysis temperature data is worse in higher elevation than that in lower ***5 reanalysis temperature can capture observational warming rates *** the smallest warming rates of observational temperature and ERA5 reanalysis temperature are found in winter,with the warming rates of 0.393°C/10a and 0.360°C/10a,*** study will provide a reference for the application of ERA5 reanalysis monthly averaged air temperature data at different elevation ranges in the Qilian Mountains.

关键词： ERA5 Reanalysis data Air temperature Qilian Mountains Climate change

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Control of Corner Separation for a Linear Compressor Cascade via Bionic Slanting Riblets at the Endwall

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Journal of Thermal Science 2025年第1期34卷 129-144页

作者： ZHANG peng LI Yonghong CHENG Rixin Key Laboratory of Civil Aircraft Airworthiness Technology Civil Aviation University of ChinaTianjin 300300China College of Aeronautical Engineering Civil Aviation University of ChinaTianjin 300300China

A new passive control approach,utilizing bionic slanting riblets,is employed to mitigate the flow close to the blade endwall in a linear cascade,and its effectiveness and mechanism in controlling corner separation are investigated through numerical *** slanting riblets are positioned at the endwall upstream of the cascade channel,and the influence of riblet height,yaw angle and relative position on the control of corner separation is *** findings indicate that the application of slanting riblets can efficiently counteract corner separation across the stable operational ***,the introduction of riblets with a height of merely 0.1 times the boundary layer thickness results in a significant reduction in total pressure loss by up to 14.53%,while simultaneously enhancing the static pressure coefficient by 21.74%.Flow analysis reveals that minute vortices produced within the riblet channels tend to coalesce,forming a potent large-scale vortex near the boundary layer's base *** phenomenon results in reduced additional losses compared to conventional vortex ***,the induced vortex promotes enhanced mixing between the mainstream flow and boundary layer,inhibiting the lateral displacement of low-energy fluids within the endwall boundary ***,this delays the onset of separation vortex formation and eliminates vortex rings in the corner region,ultimately enhancing the aerodynamic efficiency of the cascade.

关键词： corner separation compressor cascade slanting riblets additional losses vortex generator

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Exploratory growth and characterization of CaNdAl_(3)O_(7) single crystal with nonsymmetric structure in tetragonal family

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Journal of Rare Earths 2025年第1期43卷 153-161,I0006页

作者： Xiangkang peng Fapeng Yu State Key Laboratory of Crystal Materials Institute of Crystal MaterialsShandong UniversityJinan250100China

The new component of melilite type crystal CaNdAl_(3)O_(7)(CNA)was grown by the Czochralski pulling *** crystal structure analysis was *** is found that the CNA crystal belongs to the tetragonal system with P-421m space *** cell parameters a=b=0.77461 nm and c=0.51089 *** density and Mohs hardness of CNA crystal are 4.08 g/cm^(3) and 5.45,*** specific heat of the crystal is 0.57-0.77 J/(g·K)in the temperature range of 30-300℃.X-ray photoelectron spectro scopy(XPS)shows that the crystal has stable atomic valence states and chemical *** vibration state of polyhedra groups in the crystal was measured by Raman spectra,and the piezoelectric response was analyzed based on the calculated results for the polyhedra polarization dipole *** relative dielectric permittivity of the CNA crystal at room temperature was determined to be 11.80 and the electrical resistivity was measured to be on the order of 5×10^(6)Ω·cm at 800℃.

关键词： Piezoelectric Melilite Crystal growth High-temperature Czochralski Rareearths

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Recent advances in exploring new blood-based biomarkers for the early diagnosis of gastric cancer

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Science China Chemistry 2025年第1期68卷 35-45页

作者： Xinyu peng Qian Ma Da Han School of Life Science Shanghai UniversityShanghai 200444China Institute of Molecular Medicine Shanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineState Key Laboratory of Oncogenes and Related GenesRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200025China Department of Research and Development Intellinosis Biotechnologies Co.Ltd.Shanghai 201112China

Gastric cancer(GC)is a prevalent and lethal malignancy worldwide,and the 5-year survival rate is less than 30%.The absence of distinctive symptoms often leads to late-stage diagnosis,contributing to a grim *** detection is pivotal for improving the survival rates and outcomes of GC *** diagnostic methods,including gastroscopy and histopathological examination,are restricted in the early diagnosis of *** protein biomarkers,such as carcinoembryonic antigen(CEA),carbohydrate antigen 19-9(CA19-9),and carbohydrate antigen 72-4(CA72-4),exhibit insufficient sensitivity and specificity for GC screening,which diminishes their clinical ***,novel circulating biomarkers,such as circulating tumor cells(CTCs),circulating tumor cell DNA(ct DNA),and circulating free RNA(cf RNA),have emerged as promising candidates in the burgeoning field of liquid biopsy due to their superior sensitivity and *** review focuses on the latest research on blood-based biomarkers for GC diagnosis and examines the clinical potentials and challenges associated with these emerging biomarkers.

关键词： gastric cancer early diagnosis blood

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Observation of acoustic hybrid topological phases induced by the p-d orbital interactions

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 128-135页

作者： Xiao Xiang Feng Gao Yu-Gui peng peng Wu Zong-Lin Li Xue-Feng Zhu School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China

In spinless systems,growing attention has recently been attracted to synthetic gauge fields,which redefine the fundamental crystal symmetries by utilizing the projective algebraic ***,synthetic gauge fields have been commonly investigated in single orbital systems,and explorations on hybrid orbitals remain elusive in ***,we report the experimental observation of hybrid topological phases induced by hybrid synthetic gauge flux,which is formed by the interaction between p and d orbitals embedded in acoustic *** breaking the translation symmetries of L_(x) and/or L_(y),we unambiguously demonstrate the first-order Möbius edge states and higher-order corner *** work establishes a platform for seeking exotic topological phases induced by hybrid-orbitals interactions and initializing the framework of hybrid-orbitalsrelated topological *** applications can be anticipated in scenarios such as high-quality sensing and robust wave trapping due to the stepwise energy distribution of the hybrid topological phase.

关键词： topological insulator synthetic gauge field projective symmetry corner states

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Analyzing carbon emissions and influencing factors in Chengdu-Chongqing urban agglomeration counties

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Journal of Environmental Sciences 2025年第5期151卷 640-651页

作者： Zhang Heng Lu Wenfu peng Lindan Zhang Key Laboratory of the Evaluation and Monitoring of Southwest Land Resources(Ministry of Education) Sichuan Normal UniversityChengdu 610068China The Institute of Geography and Resources Science Sichuan Normal UniversityChengdu 610068China

Majority of carbon emissions originate from fossil energy consumption,thus necessitating calculation and monitoring of carbon emissions from energy *** this study,we utilized energy consumption data from Sichuan Province and Chongqing Municipality for the years 2000 to 2019 to estimate their statistical carbon *** then employed nighttime light data to downscale and infer the spatial distribution of carbon emissions at the county level within the Chengdu-Chongqing urban ***,we analyzed the spatial pattern of carbon emissions at the county level using the coefficient of variation and spatial autocorrelation,and we used the Geographically and Temporally Weighted Regression(GTWR)model to analyze the influencing factors of carbon emissions at this *** results of this study are as follows:(1)from 2000 to 2019,the overall carbon emissions in the Chengdu-Chongqing urban agglomeration showed an increasing trend followed by a decrease,with an average annual growth rate of 4.24%.However,in recent years,it has stabilized,and 2012 was the peak year for carbon emissions in the Chengdu-Chongqing urban agglomeration;(2)carbon emissions exhibited significant spatial clustering,with high-high clustering observed in the core urban areas of Chengdu and Chongqing and low-low clustering in the southern counties of the Chengdu-Chongqing urban agglomeration;(3)factors such as GDP,population(Pop),urbanization rate(Ur),and industrialization structure(Ic)all showed a significant influence on carbon emissions;(4)the spatial heterogeneity of each influencing factor was evident.

关键词： Carbon emissions Chengdu-Chongqing urban agglomeration Spatial autocorrelation Geographically and temporally weighted regression

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