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Noise-assisted MEMD based relevant IMFs identification and EEG classification

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Journal of Central South University 2017年第3期24卷 599-608页

作者： she qing-shan MA Yu-liang MENG Ming XI Xu-gang LUO Zhi-zeng Institute of Intelligent Control and Robotics Hangzhou Dianzi University Hangzhou 310018 China

Noise-assisted multivariate empirical mode decomposition(NA-MEMD) is suitable to analyze multichannel electroencephalography(EEG) signals of non-stationarity and non-linearity natures due to the fact that it can provide a highly localized time-frequency *** a finite set of multivariate intrinsic mode functions(IMFs) decomposed by NA-MEMD,it still raises the question on how to identify IMFs that contain the information of inertest in an efficient way,and conventional approaches address it by use of prior *** this work,a novel identification method of relevant IMFs without prior information was proposed based on NA-MEMD and Jensen-shannon distance(JSD) measure.A criterion of effective factor based on JSD was applied to select significant IMF *** each decomposition scale,three kinds of JSDs associated with the effective factor were evaluated:between IMF components from data and themselves,between IMF components from noise and themselves,and between IMF components from data and *** efficacy of the proposed method has been demonstrated by both computer simulations and motor imagery EEG data from BCI competition IV datasets.

关键词： multichannel electroencephalography noise-assisted multivariate empirical mode decomposition Jensen-shannondistance brain-computer interface

On optimal charging scheduling for electric vehicles with wind power generation

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Fundamental Research 2024年第4期4卷 951-960页

作者： Junjie Wu qing-shan Jia Center for Intelligent and Networked Systems(CFINS) Department of AutomationBeijing National Research Center for Information Science and Technology(BNRist)TsinghuaUniversityBeijing100084China Huawei Technologies Co.Ltd Shenzhen 518129China

We consider the scheduling of battery charging of electric vehicles(EVs)integrated with renewable power *** increasing adoption of EVs and the development of renewable energies contribute importance to this *** optimization of charging scheduling is challenging because of the large action space,the multi-stage decision making,and the high *** solve this problem is time-consuming when the scale of the system is *** is urgent to develop a practical and efficient method to properly schedule the charging of *** contribution of this work is ***,we provide a sufficient condition on which the charging of EVs can be completely self-sustained by distributed *** algorithm is proposed to obtain the optimal charging policy when the sufficient condition ***,the scenario when the supply of the renewable power generation is deficient is *** prove that when the renewable generation is deterministic there exists an optimal policy which follows the modified least laxity and longer remaining processing time first(mLLLP)***,we provide an adaptive rule-based algorithm which obtains a near-optimal charging policy efficiently in general *** test the proposed algorithm by numerical *** results show that it performs better than the other existing rule-based methods.

关键词： Electric vehicle Charging scheduling Wind power Optimal policy Renewable energy

Cryptic diversity and rampant hybridization in annual gentians on the qinghai-Tibet Plateau revealed by population genomic analysis

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Plant Diversity 2024年第2期46卷 194-205页

作者： Peng-Cheng Fu Qiao-Qiao Guo Di Chang qing-Bo Gao shan-shan Sun School of Life Science Luoyang Normal UniversityLuoyang 471934PR China Key Laboratory of Adaptation and Evolution of Plateau Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810001PR China

Understanding the evolutionary and ecological processes involved in population differentiation and speciation provides critical insights into biodiversity formation. In this study, we employed 29,865 single nucleotide polymorphisms(SNPs) and complete plastomes to examine genomic divergence and hybridization in Gentiana aristata, which is endemic to the qinghai-Tibet Plateau(QTP) region. Genetic clustering revealed that G. aristata is characterized by geographic genetic structures with five clusters(West, East, Central, South and North). The West cluster has a specific morphological character(i.e., blue corolla) and higher values of FSTcompared to the remaining clusters, likely the result of the geological barrier formed by the Yangtze River. The West cluster diverged from the other clusters in the Early Pliocene;these remaining clusters diverged from one another in the Early Quaternary. Phylogenetic reconstructions based on SNPs and plastid data revealed substantial cyto-nuclear conflicts. Genetic clustering and D-statistics demonstrated rampant hybridization between the Central and North clusters,along the Bayankala Mountains, which form the geological barrier between the Central and North clusters. Species distribution modeling demonstrated the range of G. aristata expanded since the Last Interglacial period. Our findings provide genetic and morphological evidence of cryptic diversity in G. aristata, and identified rampant hybridization between genetic clusters along a geological *** findings suggest that geological barriers and climatic fluctuations have an important role in triggering diversification as well as hybridization, indicating that cryptic diversity and hybridization are essential factors in biodiversity formation within the QTP region.

关键词： Gentiana aristata Hybrid zone qinghai-Tibet Plateau Plastome Nuclear SNPs

Design of weak current measurement system and research on temperature impact

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Nuclear Science and Techniques 2024年第4期35卷 46-56页

作者： Chu-Xiang Zhao San-Gang Li Rong-Rong Su Li Yang Ming-Zhe Liu qing-Yue Xue shan Liao Zhi Zhou qing-shan Tan Xian-Guo Tuo Yi Cheng College of Nuclear Technology and Automation Engineering Chengdu University of Technology1#DongsanluErxianqiaoChengdu 610059China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of Technology1#DongsanluErxianqiaoChengdu 610059China University of Science and Technology of China Hefei 230026China School of Physics and Electronic Engineering Sichuan University of Science and EngineeringZigong 643000China

A dedicated weak current measurement system was designed to measure the weak currents generated by the neutron ionization *** system incorporates a second-order low-pass filter circuit and the Kalman filtering algorithm to effectively filter out noise and minimize interference in the measurement *** conducted under normal temperature conditions has demonstrated the system's high precision ***,it was observed that temperature variations can affect the measurement *** were collected across temperatures ranging from -20 to 70℃,and a temperature correction model was established through linear regression fitting to address this *** feasibility of the temperature correction model was confirmed at temperatures of -5 and 40℃,where relative errors remained below 0.1% after applying the temperature *** research indicates that the designed measurement system exhibits excellent temperature adaptability and high precision,making it particularly suitable for measuring weak currents.

关键词： Weak current measurement system Neutron ionization chamber Kalman filter algorithm Temperature correction model

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一种基于数据域描述的图像压缩方法

模式识别与人工智能 2007年第5期20卷 643-648页

作者：佘青山苏宏业张英褚健浙江大学先进控制研究所工业控制技术国家重点实验室杭州310027

提出一种基于数据域描述的自适应加权支持向量回归图像压缩算法.先将一幅灰度图像分割成不重叠的方块,每个方块数据经过离散余弦变换得到对应的频率域系数,然后根据样本到高维特征空间最小包含超球球心的距离构建相应的加权函数模型,最... 详细信息

提出一种基于数据域描述的自适应加权支持向量回归图像压缩算法.先将一幅灰度图像分割成不重叠的方块,每个方块数据经过离散余弦变换得到对应的频率域系数,然后根据样本到高维特征空间最小包含超球球心的距离构建相应的加权函数模型,最后将确立的模型应用到基于加权支持向量回归的图像压缩方案中.实验结果表明,与同类的图像压缩算法相比,该算法在预测性能和压缩效果方面获得较明显提高.

关键词：数据域描述加权支持向量机(w—SVM) 离散余弦变换图像压缩

基于多流空间注意力图卷积SRU网络的骨架动作识别

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电子学报 2022年第7期50卷 1579-1585页

作者：赵俊男佘青山孟明陈云杭州电子科技大学自动化学院浙江杭州310018

基于骨架的动作识别越来越受到重视.针对现有算法推理速度慢、数据模式单一等问题,本文提出了一种轻量且高效的方法.该网络在简单循环单元(Simple Recurrent Unit,SRU)中嵌入图卷积算子构建图卷积SRU(GCSRU)模型,来捕获数据的时空域信息... 详细信息

基于骨架的动作识别越来越受到重视.针对现有算法推理速度慢、数据模式单一等问题,本文提出了一种轻量且高效的方法.该网络在简单循环单元(Simple Recurrent Unit,SRU)中嵌入图卷积算子构建图卷积SRU(GCSRU)模型,来捕获数据的时空域信息.同时,为了加强节点间的区分,采用空间注意力网络和多流数据融合方式,将GC-SRU拓展成多流空间注意力图卷积SRU(MSAGC-SRU).最后,在公开数据集上进行实验分析.结果表明,本文方法在Northwestern-UCLA上的分类准确率达到了93.1%,模型FLOPs为4.4 G;NTU RGB+D上的分类准确率在CV、CS评估协议下分别达到92.7%和87.3%,模型FLOPs为21.3 G,达到了计算效率和分类精度的良好平衡.

关键词：动作识别图卷积注意力机制数据融合

Smad8 is involvement in follicular development via the regulation of granulosa cell growth and steroidogenesis in mice

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BIOCELL 2024年第1期48卷 139-147页

作者： DAOLUN YU DEYONG she KAI GE LEI YANG RUINA ZHAN shan LU YAFEI CAI College of Biotechnology and Pharmaceutical Engineering West Anhui UniversityLu’an237012China Lu’an Academy of Agricultural Sciences Lu’an237001China College of Life Sciences Anhui Normal UniversityWuhu241000China College of Animal Science and Technology Nanjing Agricultural UniversityNanjing210095China

Background:SMAD family proteins(SMADs)are crucial transcription factors downstream of transforming growth factor beta(TGF-ß)/SMAD signaling pathways that have been reported to play a pivotal role in mammalian ***,the role of SMAD family member 8(SMAD8,also known as SMAD9),a member of the SMAD family,in mammalian reproduction remains ***:We employed RNA interference techniques to knock down Smad8 expression in mouse granulosa cells(GCs)to investigate the effects of Smad8 on GC growth and ***:Our findings revealed a significant decrease in the proliferative capacity and a substantial increase in the apoptosis rate of GCs after transfection with Smad8-siRNA for 48 *** hormone assays demonstrated a significant decrease in estradiol(E2)levels,whereas progesterone(P4)remained *** mechanistic analysis showed that the mRNA expression of proliferating cell nuclear antigen(Pcna),Cyclin D2,cell cycle-dependent kinase 4(Cdk4),B-cell lymphoma-2(Bcl-2),estrogen receptor(Er),luteinizing hormone receptor(Lhr)and cytochrome P450 family 19 subfamily A member 1(Cyp19a1)significantly ***,the mRNA of cysteine aspartate proteinase 3(Caspase 3)significantly increased,wheras Bcl2-associated X(Bax),folliclestimulating hormone receptor(Fshr)and cytochrome P450 family 11 subfamily A member 1(Cyp11a1)remained unchanged compared to the ***:This study indicates that Smad8 knockdown inhibits cell proliferation,promotes apoptosis,reduces Er and Lhr transcription,and decreases E2 production in mouse *** findings suggest that Smad8 may serve as a novel genetic marker for mammalian reproduction.

关键词： Mouse Smad8 RNA interference Granulosa cells Growth and steroidogenesis

Significantly Enhanced Melt Memory Effect of Metallocene-made Isotactic Polypropylene Containing Talc

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Chinese Journal of Polymer Science 2024年第2期42卷 213-222,I0008页

作者： Hong-Wen Sun Fu-shan Wang Yan Gao Fu-qing Wei Jia-Chun Feng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China Lanzhou Petrochemical Corporation of PetroChina Lanzhou730060China Lanzhou Petrochemical Research Center Petrochemical Research Institute of PetroChinaLanzhou730060China

The melt memory effect is a widely observed phenomenon in semi-crystalline polymers. In practical applications, various additives are usually introduced into polymers, which may affect their melt memory behavior. In this work, the effect of talc on the melt memory effect of metallocene-made isotactic polypropylene(M-PP) was investigated in detail by using the differential scanning calorimetry. The results indicated that the introduction of talc significantly strengthened the melt memory effect of M-PP. Specifically, the upper limit temperature of Domain II increased from 161 ℃ to 174 ℃, resulting in a substantial widening of the temperature range of Domain IIa from 1 ℃ to 14 ℃. Analysis of the crystal orientation of the M-PP containing talc cooled from various Ts suggested that the remarkably enhanced melt memory effect could be ascribed to the stabilization of oriented nuclei facilitated by talc. This stabilizing effect was likely attributable to the prefreezing effect or the sorption interaction between talc and the M-PP chains.

关键词： Metallocene-made isotactic polypropylene Talc Melt memory effect Crystal orientation

Triggering triplet excitons of carbon nanodots through nanospace domain confinement for multicolor phosphorescence in aqueous solution

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Nano Research 2024年第7期17卷 6534-6543页

作者： Ya-Chuan Liang qing Cao Yuan Deng Yong Wang Kai-Kai Liu Chong-Xin shan School of Electronics and Information Zhengzhou University of Light IndustryZhengzhou 450002China Henan Key Laboratory of Diamond Optoelectronic Material and Devices Key Laboratory of Material PhysicsMinistry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China Academy for Quantum Science and Technology Zhengzhou University of Light IndustryZhengzhou 450002China Institute of Quantum Materials and Physics Henan Academy of SciencesZhengzhou 450046China

Easy non-radiative decay property of long-lived triplet excitons in aqueous solution obstructs their applications in aquatic *** reported phosphorescence phenomena in aqueous solution have excited researchers enormously but achieving full-color water-soluble phosphorescent carbon nanodots(CNDs)is still a challenging ***,full-color phosphorescence of water-soluble CNDs has been demonstrated by triggering their triplet excitons through nanospace domain confinement,and Förster energy resonance transfer is used for further tuning phosphorescence *** phosphorescence spans across most of the visible spectrum,ranging from 400 to 700 *** an aqueous solution,the CNDs exhibits blue,green,and red phosphorescence,lasting for approximately 6,10,and 7 s,***,the phosphorescence quantum yields are 11.85%,8.6%and 3.56%,making them readily discernible to the naked eyes and laying a solid foundation for practical ***,phosphorescence flexible optical display and bioimaging have been demonstrated by using the multicolor CNDs-based nanomaterials,showing distinct superiority for accuracy and complete display and imaging in complex emission background.

关键词： carbon nanodots triplet excitons multicolor aqueous solution