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Multi-Scale Feature Extraction for Joint Classification of Hyperspectral and LiDAR Data

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Journal of Beijing Institute of Technology 2023年第1期32卷 13-22页

作者： Yongqiang Xi zhen ye School of Electronics and Control Engineering Chang’an UniversityXi’an 710064China

With the development of sensors,the application of multi-source remote sensing data has been widely *** hyperspectral image(HSI)contains rich spectral information while light detection and ranging(LiDAR)data contains elevation information,joint use of them for ground object classification can yield positive results,especially by building deep ***-nately,multi-scale deep networks allow to expand the receptive fields of convolution without causing the computational and training problems associated with simply adding more network *** this work,a multi-scale feature fusion network is proposed for the joint classification of HSI and LiDAR ***,we design a multi-scale spatial feature extraction module with cross-channel connections,by which spatial information of HSI data and elevation information of LiDAR data are extracted and *** addition,a multi-scale spectral feature extraction module is employed to extract the multi-scale spectral features of HSI ***,joint multi-scale features are obtained by weighting and concatenation operations and then fed into the *** verify the effective-ness of the proposed network,experiments are carried out on the MUUFL Gulfport and Trento *** experimental results demonstrate that the classification performance of the proposed method is superior to that of other state-of-the-art methods.

关键词： hyperspectral image(HSI) light detection and ranging(LiDAR) multi-scale feature classification

Energy-information trade-off induces continuous and discontinuous phase transitions in lateral predictive coding

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 79-85页

作者： zhen-ye Huang Ruyi Zhou Miao Huang Hai-Jun Zhou Key Laboratory for Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China Minjiang Collaborative Center for Theoretical Physics Minjiang UniversityFuzhou 350108China

Lateral predictive coding is a recurrent neural network that creates energy-efficient internal representations by exploiting statistical regularity in sensory ***,we analytically investigate the trade-off between information robustness and energy in a linear model of lateral predictive coding and numerically minimize a free energy *** observed several phase transitions in the synaptic weight matrix,particularly a continuous transition that breaks reciprocity and permutation symmetry and builds cyclic dominance and a discontinuous transition with the associated sudden emergence of tight balance between excitatory and inhibitory *** optimal network follows an ideal gas law over an extended temperature range and saturates the efficiency upper bound of energy *** results provide theoretical insights into the emergence and evolution of complex internal models in predictive processing systems.

关键词： predictive coding recurrent neural network phase transition internal model free energy

Local Preserving Graphs Using Intra-Class Competitive Representation for Dimensionality Reduction of Hyperspectral Image

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Journal of Beijing Institute of Technology 2021年第2期30卷 139-158页

作者： zhen ye Shihao Shi Tao Sun Lin Bai School of Electronics and Control Engineering Chang’an UniversityXi’an 710064China

As a key technique in hyperspectral image pre-processing,dimensionality reduction has received a lot of ***,most of the graph-based dimensionality reduction methods only consider a single structure in the data and ignore the interfusion of multiple *** this paper,we propose two methods for combining intra-class competition for locally preserved graphs by constructing a new dictionary containing neighbourhood *** two methods explore local information into the collaborative graph through competing constraints,thus effectively improving the overcrowded distribution of intra-class coefficients in the collaborative graph and enhancing the discriminative power of the *** classifying four benchmark hyperspectral data,the proposed methods are proved to be superior to several advanced algorithms,even under small-sample-size conditions.

关键词： intra-class competition graph construction hyperspectral image dimensionality reduction

3D Distinct Element Back Analysis Based on Rock Structure Modelling of SfM Point Clouds:The Case of the 2019 Pinglu Rockfall of Kaili,China

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Journal of Earth Science 2024年第5期35卷 1568-1582页

作者： zhen ye Qiang Xu Qian Liu Xiujun Dong Feng Pu State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Institute of Applied Geosciences Graz University of TechnologyGraz 8010Austria

This paper introduces the use of point cloud processing for extracting 3D rock structure and the 3DEC-related reconstruction of slope failure,based on a case study of the 2019 Pinglu *** basic processing procedure involves:(1)computing the point normal for HSV-rendering of point cloud;(2)automatically clustering the discontinuity sets;(3)extracting the set-based point clouds;(4)estimating of set-based mean orientation,spacing,and persistence;(5)identifying the block-forming arrays of discontinuity sets for the assessment of *** effectiveness of our rock structure processing has been proved by 3D distinct element back *** results show that Sf M modelling and rock structure computing provides enormous cost,time and safety incentives in standard engineering practice.

关键词： unmanned aerial vehicle(UAV) 3D point cloud rock structure karst discontinuity sets engineeringgeology

Glacial Refugia of Ginkgo biloba and Human Impact on Its Genetic Diversity:Evidence from Chloroplast DNA

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Journal of Integrative Plant Biology 2008年第3期50卷 368-374页

作者： Wei Gong zhen Zeng ye-ye Chen Chuan Chen Ying-Xiong Qiu Cheng-Xin Fu Laboratory of Systematic Evolutionary Botany and Biodiversity and State Conservation Center for Gene Resources of Endangered Wildlife College of Life Sciences Zhejiang University Hangzhou 310058 China

Variations in the trnK region of chloroplast DNA were investigated in the present study using polymerase chain reactionrestriction fragment length polymorphism to detect the genetic structure and to infer the possible glacial refugia of Ginkgo biloba L. in China. In total, 220 individuals from 12 populations in China and three populations outside China were analyzed, representing the largest number of populations studied by molecular markers to date. Nineteen haplotypes were produced and haplotype A was found in all populations. Populations in south-western China, including WC, JF, PX, and SP, contained 14 of the 19 haplotypes and their genetic diversity ranged from 0.771 4 to 0.867 6. The TM population from China also showed a high genetic diversity （H = 0.848 5）. Most of the genetic variation existed within populations and the differentiation among populations was low （GsT = 0.2）. According to haplotype distribution and the historical record, we suggest that populations of G. biloba have been subjected to extensive human impact, which has compounded our attempt to infer glacial refugia for Ginkgo. Nevertheless, the present results suggest that the center of genetic diversity of Ginkgo is mainly in south-western China and in situ conservation is needed to protect and preserve the genetic resources.

关键词： chloroplast DNA Ginkgo biloba glacial refugia human activities polymerase chain reaction-restriction fragment length polymorphism

Lateral predictive coding revisited:internal model,symmetry breaking,and response time

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Communications in Theoretical Physics 2022年第9期74卷 158-169页

作者： zhen-ye Huang Xin-Yi Fan Jianwen Zhou Hai-Jun Zhou CAS Key Laboratory for Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China MinJiang Collaborative Center for Theoretical Physics MinJiang UniversityFuzhou 350108China

Predictive coding is a promising theoretical framework in neuroscience for understanding information transmission and *** posits that the brain perceives the external world through internal models and updates these models under the guidance of prediction *** studies on predictive coding emphasized top-down feedback interactions in hierarchical multilayered networks but largely ignored lateral recurrent *** perform analytical and numerical investigations in this work on the effects of single-layer lateral *** consider a simple predictive response dynamics and run it on the MNIST dataset of hand-written *** find that learning will generally break the interaction symmetry between peer neurons,and that high input correlation between two neurons does not necessarily bring strong direct interactions between *** optimized network responds to familiar input signals much faster than to novel or random inputs,and it significantly reduces the correlations between the output states of pairs of neurons.

关键词： neural network response dynamics predictive coding similarity symmetry breaking

Metal Organic Framework Derived Zirconia-Carbon Nanoporous Mat for Integrated Strain Sensor Powered by Solid‑State Supercapacitor

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Advanced Fiber Materials 2023年第4期5卷 1404-1416页

作者： Brindha Ramasubramanian Vundrala Sumedha Reddy ye zhen Seeram Ramakrishna Vijila Chellappan Department of Mechanical Engineering Center for Nanofibers and NanotechnologyNational University of SingaporeSingapore 117574Singapore Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)#08‑032 Fusionopolis WayInnovisSingapore 138634Singapore

Flexible electronics are essential for the rapid development of human-machine interface technology,encompassing sensors and energy storage ***-state supercapacitors with 1D nanofiber electrodes are critical for enhancing ion *** this study,a flexible supercapacitor integrated with a strain sensor was designed using a polyvinyl alcohol/polymethyl methacrylate(PVA/PMMA)-based electrolyte and a metal-organic framework(MOF)-derived Zr-nanoporous carbon mat(Zr-NPC).The sensor showed remarkable sensitivity over a broad strain range,enabling reliable and precise detection of mechanical *** supercapacitor with Zr-NPC@PVDF electrode also demonstrated a specific capacitance of 286 mF cm^(-2) at 0.5 mA cm^(-2),maintaining high flexibility and mechanical *** fabricated supercapacitor maintained around 81%charge retention after 10,000 ***,the self-powered integrated model was directly connected to the human body to detect physical motion,accentuating its potential for widespread applications in wearable technology.

关键词： Supercapacitor Piezoresistive sensor Porosity Nanocarbon

Promoter methylation and mRNA expression of DKK-3 and WIF-1 in hepatocellular carcinoma

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World Journal of Gastroenterology 2009年第21期15卷 2595-2601页

作者： zhen Ding ye-Ben Qian Li-Xin Zhu Qi-Ru Xiong Department of Surgery First Affiliated Hospital of Anhui Medical University 218 Jixi avenue Hefei 230022 Anhui Province. China

AIM:To investigate the promoter methylation status and mRNA expression of DKK-3 and WIF-1 gene in hepatocellular carcinoma(HCC).METHODS:DKK-3 and WIF-1 acted as Wnt-antagonists and tumor suppressors,but hypermethylation of the gene promoter and low mRNA expression activated Wnt signaling aberrantly and induced the development of *** status of the DKK-3 and WIF-1 gene promoter was investigated using methylation specific polymerase chain reaction(PCR) in tumor and adjacent non-cancerous tissues from 33 HCC patients and 20 normal liver tissues served as *** expression of DKK-3 and WIF-1 mRNA was also determined by real-time quantitative reverse transcriptase *** relationship between methylation,mRNA expression,and clinical data,as well as methylation and mRNA expression of the two genes were ***:The methylation of DKK-3 and WIF-1 genes in HCC increased significantly compared with adjacent non-cancerous tissues and normal control tissues(χ2 =7.79,P < 0.05;χ2 = 4.89,P < 0.05),and no significant difference in methylation between adjacent non-cancerous tissues and normal control tissues was *** HCC tissues,significant differences in the DKK-3 promoter methylation were observed in age and cirrhosis,and significant differences of the WIF-1 promoter methylation were observed in HBsAg and *** average expression of DKK-3 mRNA in HCC and adjacent non-cancerous tissues was increased significantly compared with normal control *** average expression of WIF-1 mRNA showed no significant difference among the three *** mRNA expression of DKK-3 gene in HCC was decreased as the pathological grade ***:The aberrant promoter methylation and decreased expression of DKK-3 and WIF-1 may be an important mechanism in HCC,and may be a far-reaching significance in early diagnosis and therapy of HCC.

关键词： Hepatocellular carcinoma DKK-3 WIF-1 Promoter methylation

Correlation of Microstructure Feature with Impact Fracture Behavior in a TMCP Processed High Strength Low Alloy Construction Steel

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 527-536页

作者： Wen-Ting Zhu Jun-Jun Cui zhen-ye Chen Yang Zhao Li-Qing Chen State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China User Technology Department Technology Research Institute of HBISShijiazhuang 050000China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

The present article aims at elucidating the effect of thermo-mechanical controlled processing(TMCP), especially the finish cooling temperature, on microstructure and mechanical properties of high strength low alloy steels for developing superior low temperature toughness construction steel. The microstructural features were characterized by scanning electron microscope equipped with electron backscatter diffraction, and the mechanical behaviors in terms of tensile properties and impact toughness were analyzed in correlation with microstructural evolution. The results showed that the lower finish cooling temperature could lead to a considerable increase in impact toughness for this steel. A mixed microstructure was obtained by TMCP at lower finish cooling temperature, which contained much fine lath-like bainite with dot-shaped M/A constituent and less granular bainite and bainite ferrite. In this case, this steel possesses yield and ultimate tensile strengths of ~ 885 MPa and 1089 MPa, respectively, and a total elongation of ~ 15.3%, while it has a lower yield ratio of ~ 0.81. The superior impact toughness of ~ 89 J at-20 °C was obtained, and this was resulted from the multi-phase microstructure including grain refinement, preferred grain boundaries misorientation, fine lath-like bainite with dot-shaped M/A constituent.

关键词： High strength low alloy steel Thermo-mechanical controlled processing(TMCP) Finish cooling temperature Microstructure Mechanical properties Impact toughness