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2D-Material-Based Volatile and Nonvolatile Memristive Devices for Neuromorphic Computing

ACS MATERIALS LETTERS 2023年第4期5卷 1109-1135页

作者： xia, xuwen Huang, Wen Hang, Pengjie Guo, Tao Yan, Yong Yang, Jianping Yang, Deren Yu, Xuegong Li, Xing'ao Nanjing Univ Posts & Telecommun NJUPT New Energy Technol Engn Lab Jiangsu Prov Nanjing 210023 Peoples R China Nanjing Univ Posts & Telecommun NJUPT Sch Sci Nanjing 210023 Peoples R China Zhejiang Univ State Key Lab Silicon Mat Hangzhou 310027 Zhejiang Peoples R China Zhejiang Univ Sch Mat Sci & Engn Hangzhou 310027 Zhejiang Peoples R China Univ Waterloo Waterloo Inst Nanotechnol Ctr Adv Mat Joining Dept Mech & Mechatron Engn Waterloo ON N2L 3G1 Canada Henan Normal Univ Sch Phys Henan Key Lab Photovolta Mat Xinxiang 453007 Peoples R China Zhejiang Univ Sci & Technol Sch Sci Hangzhou 310027 Peoples R China

Neuromorphic computing can process large amounts of information in parallel and provides a powerful tool to solve the von Neumann bottleneck. Constructing an artificial neural network (ANN) is a common means to realize neuromorphic computing, which has exhibited potential applications in pattern recognition, complex sensing, and other areas. Reservoir computing (RC), which is another approach to realize neuromorphic computing, has shown some progress and attracted researchers' attention. Neuromorphic computing can be generally implemented by fabricating memristive array systems. 2D-material-based memristive systems and their applications in ANN and RC have been investigated substantially in recent years due to the unique properties of these systems, such as atomic-level thickness and high carrier mobility. In this Review, we first discuss the volatility and nonvolatility properties of memristive devices and their applications in ANN and RC. Second, 2D materials that can be used to fabricate these devices are introduced, and their classification, physical properties, and preparation methods are presented. Third, we discuss the working mechanisms of 2D-material-based synaptic devices, the mimicked synaptic functions, and the applications of these devices in neuromorphic computing through ANN and RC. Lastly, the performance, progress, and future development directions of 2D-material-based synaptic devices are analyzed. This work systematically investigates the status of 2D-material-based synaptic devices and promotes their utilization in neuromorphic computing.

关键词： Electrical conductivity Layers Memristors Polarization Two dimensional materials

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Memristive Artificial Synapses for Neuromorphic Computing

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Nano-Micro Letters 2021年第5期13卷 218-245页

作者： Wen Huang xuwen xia Chen Zhu Parker Steichen Weidong Quan Weiwei Mao Jianping Yang Liang Chu Xing’ao Li New Energy Technology Engineering Laboratory of Jiangsu Province and School of Science Nanjing University of Posts and Telecommunications(NJUPT)Nanjing 210023People’s Republic of China Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials Jiangsu National Synergistic Innovation Center for Advanced MaterialsSchool of Materials Science and EngineeringNanjing University of Posts and Telecommunications(NUPT)9 Wenyuan RoadNanjing 210023People’s Republic of China College of Electronic and Optical Engineering and College of Microelectronics Nanjing University of Posts and Telecommunications(NJUPT)Nanjing 210023People’s Republic of China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195‑2120USA

Neuromorphic computing simulates the operation of biological brain function for information processing and can potentially solve the bottleneck of the von Neumann *** computing is realized based on memristive hardware neural networks in which synaptic devices that mimic biological synapses of the brain are the primary *** synaptic functions with these devices is critical in neuromorphic *** the last decade,electrical and optical signals have been incorporated into the synaptic devices and promoted the simulation of various synaptic *** this review,these devices are discussed by categorizing them into electrically stimulated,optically stimulated,and photoelectric synergetic synaptic devices based on stimulation of electrical and optical *** working mechanisms of the devices are analyzed in *** is followed by a discussion of the progress in mimicking synaptic *** addition,existing application scenarios of various synaptic devices are ***,the performances and future development of the synaptic devices that could be significant for building efficient neuromorphic systems are prospected.

关键词： Synaptic devices Neuromorphic computing Electrical pulses Optical pulses Photoelectric synergetic effects

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High-performance carbon-electrode-based self-powered optoelectronic synaptic devices

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Science China(Information Sciences) 2024年第5期67卷 339-340页

作者： Wen HUANG xuwen xia Huixing ZHANG Tenglong GUO Pengjie HANG Bin LI Jiawei TANG Biao LI Chen ZHU Lei WANG Deren YANG Xuegong YU Xing'ao LI Jiangsu Provincial Engineering Research Center of Low Dimensional Physics and New Energy & School of Science Nanjing University of Posts and Telecommunications College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University

A two-terminal self-powered optoelectronic structure could mimic synaptic functions of a human brain synapse unit(Figure 1(a)) based on the photovoltaic effects [1], demonstrating the potential for decreasing energy consumption for future computing. However, current self-powered optoelectronic synaptic devices face issues of stability and cost,which mainly arise from noble metal electrodes and independent hole transport layers used in these structures. Substituting low-cost carbon for these metal electrodes and carrier transport layers may promise to solve these challenges.

关键词： electrode devices carbon high based optoelectronic performance self-powered synaptic

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基于改进帧间差分法的经纱撞筘拥纱在线检测

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纺织学报 2021年第6期42卷 91-96页

作者：夏旭文孟朔潘如如高卫东生态纺织教育部重点实验室(江南大学) 江苏无锡214122

为实时检测浆纱过程中经纱撞筘现象,开发了基于机器视觉方法的浆纱机经纱撞筘拥纱实时自动检测系统。通过自主搭建的图像采集系统捕捉经纱通过筘齿完整图像。首先裁剪初始图像获取检测区域,然后通过高斯滤波进行图像平滑以降低图像细节... 详细信息

为实时检测浆纱过程中经纱撞筘现象,开发了基于机器视觉方法的浆纱机经纱撞筘拥纱实时自动检测系统。通过自主搭建的图像采集系统捕捉经纱通过筘齿完整图像。首先裁剪初始图像获取检测区域,然后通过高斯滤波进行图像平滑以降低图像细节层次;然后扩大帧间差,加入Canny边缘算法和膨胀的数学形态学运算来实现对帧间差分法的改进,最后通过改进帧间差分法实现浆纱机经纱撞筘拥纱的识别。实验结果表明:所开发的检测系统可准确地识别浆纱机经纱撞筘拥纱和对拥纱进行跟踪,并且达到实时检测的作用,可以为实际生产提供指导。

关键词：撞筘检测图像处理帧差法高斯滤波形态学运算

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Two-terminal self-rectifying optoelectronic synaptic devices with largest-dynamic-range updates

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APPLIED MATERIALS TODAY 2023年 30卷

作者： Huang, Wen Hang, Pengjie xia, xuwen Li, Bin Li, Biao Kan, Chenxia Zhang, Huixing Zhu, Chen Wang, Chenhao Zhu, xiaodong Yang, Deren Pi, xiaodong Yu, Xuegong Li, Xing'ao Nanjing Univ Posts & Telecommun New Energy Technol Engn Lab Jiangsu Provence 9 Weiyuan Rd Nanjing 210023 Peoples R China Nanjing Univ Posts & Telecommun Sch Sci 9 Weiyuan Rd Nanjing 210023 Peoples R China Zhejiang Univ State Key Lab Silicon Mat Hangzhou 310027 Peoples R China Nanjing Univ Posts & Telecommun Coll Elect & Opt Engn Nanjing 210023 Peoples R China Nanjing Univ Posts & Telecommun Coll Microelect Nanjing 210023 Peoples R China Zhejiang Univ Sci & Technol Sch Sci Hangzhou 310027 Peoples R China

Two-terminal optoelectronic synaptic devices have attracted increasing attention owing to their simplicity of structures, which facilitate the device integration in neuromorphic computing systems. However, synaptic-weight updates and self-rectifying properties in two-terminal optoelectronic synaptic devices are inferior. Here, we fabricate two-terminal optoelectronic synaptic devices in accordance with the hybrid structure of optically active layers MAPbI(3) and electron transport layers (ETLs) SnO2 in an n-i-p planar system, where MAPbI3 and SnO2 are used for generating and trapping carriers, respectively. Synaptic functionalities such as excitatory post-synaptic current (EPSC), paired-pulse facilitation (PPF), spike-number dependent plasticity (SNDP), and spike-rate dependent plasticity (SRDP) are all successfully mimicked without external bias. These synaptic devices possess self-rectifying properties with a highest ratio of similar to 0.3 x 10(3) and their synaptic weight exhibits largest-dynamic-range updates of 14.3 within 14 seconds among the reported two-terminal optoelectronic synaptic devices. Furthermore, the spike-number tunability of EPSC in the synaptic devices leads to the realization of straight running of agrimotor driverless technology. Results dramatically promote the development of two-terminal optoelectronic synaptic devices in neuromorphic computing.

关键词： Two-terminal optoelectronic synaptic devices SnO2 MAPbI(3) Self-rectifying Synaptic-weight updates

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基于卷积神经网络的机织物密度均匀性检测

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纺织学报 2021年第2期42卷 101-106页

作者：孟朔夏旭文潘如如周建王蕾高卫东生态纺织教育部重点实验室(江南大学) 江苏无锡214122

针对目前基于机器视觉的机织物密度自动检测时织物检测视野小、精度低、品种适应性差的问题,提出一种基于多尺度卷积神经网络的检测方法。首先设计了一套离线图像采集系统连续采集织物图像,并建立一个包含详细织物参数的织物图像数据集... 详细信息

针对目前基于机器视觉的机织物密度自动检测时织物检测视野小、精度低、品种适应性差的问题,提出一种基于多尺度卷积神经网络的检测方法。首先设计了一套离线图像采集系统连续采集织物图像,并建立一个包含详细织物参数的织物图像数据集;然后采用一种具有不同大小局部感受野的多尺度卷积神经网络适应不同大小的织物结构特征,定位纱线位置;最后利用霍夫变换及灰度投影方法处理网络模型所预测的纱线位置图,计算织物经纬密度,并对织物密度均匀性做出评价。结果表明:与其他方法相比,本文方法对于不同类型织物的经纬密度计算误差小于2%,检测精度更高,品种适应性更强。

关键词：机织物织物密度织物参数图像处理卷积神经网络

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A CHARACTERIZATION OF CAPILLARY SPHERICAL CAPS BY A PARTIALLY OVERDETERMINED PROBLEM IN A HALF BALL

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PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY 2025年第1期153卷 161-170页

作者： Jia, xiaohan Lu, Zheng xia, Chao Zhang, xuwen Southeast Univ Sch Math Nanjing 211189 Peoples R China Xiamen Univ Sch Math Sci Xiamen 361005 Peoples R China Albert Ludwigs Univ Freiburg Math Inst D-79104 Freiburg Germany Goethe Univ Inst Math D-60325 Frankfurt Germany Univ Freiburg Math Inst Ernst Zermelo Str1 D-79104 Freiburg Germany

In this paper, we study a Serrin-type partially overdetermined problem proposed by Guo-xia [Calc. Var. Partial Differential Equations (2019), Paper No. 160, 15], and prove a rigidity result that characterizes capillar... 详细信息

关键词： Key words and phrases. Serrin's overdetermined problem mixed boundary value problem capillary hypersurfaces. capillary hypersurfaces

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Willmore-type inequality in unbounded convex sets

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JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES 2025年第3期111卷

作者： Jia, xiaohan Wang, Guofang xia, Chao Zhang, xuwen Southeast Univ Sch Math Nanjing Peoples R China Univ Freiburg Math Inst Ernst Zermelo Str1 D-79104 Freiburg Germany Xiamen Univ Sch Math Sci Xiamen Peoples R China

In this paper, we prove the following Willmore-type inequality: on an unbounded closed convex set K subset of Rn+1$K\subset \mathbb {R}{n+1}$ (n >= 2$(n\geqslant 2$), for any embedded hypersurface Sigma subset of K...

In this paper, we prove the following Willmore-type inequality: on an unbounded closed convex set K subset of Rn+1$K\subset \mathbb {R}<^>{n+1}$ (n >= 2$(n\geqslant 2$), for any embedded hypersurface Sigma subset of K${\Sigma }\subset K$ with boundary partial derivative Sigma subset of partial derivative K$\partial {\Sigma }\subset \partial K$ satisfying a certain contact angle condition, there holds 1n+1 integral Sigma HndA >= AVR(K)|Bn+1|.$$\begin{equation*} {\frac{1}{n+1}\int _{{\Sigma }}{\left|{H}\right|}<^>n d A\geqslant \rm AVR}(K)\vert \mathbb {B}<^>{n+1}\vert . \end{equation*}$$Moreover, equality holds if and only if Sigma${\Sigma }$ a part of a sphere and K\Omega$K\setminus \Omega$ is a part of the solid cone determined by Sigma${\Sigma }$. Here, Omega$\Omega$ is the bounded domain enclosed by Sigma${\Sigma }$ and partial derivative K$\partial K$, H$H$ is the normalized mean curvature of Sigma${\Sigma }$, and AVR(K)${\rm AVR}(K)$ is the asymptotic volume ratio of K$K$. We also prove an anisotropic version of this Willmore-type inequality. As a special case, we obtain a Willmore-type inequality for anisotropic capillary hypersurfaces in a half-space.

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Benchmarks for permanent carbon in low-carbon probabilistic design of concrete structures: A case study of China

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JOURNAL OF CLEANER PRODUCTION 2025年 489卷

作者： Guan, xiangshuo xiao, Jianzhuang xia, Bing xiao, xuwen Noguchi, Takafumi Tongji Univ Coll Civil Engn Dept Struct Engn 1239 Siping Rd Shanghai 200092 Peoples R China Guangxi Univ Inst Sci & Technol Carbon Peak & Neutral Nanning 530004 Peoples R China Hong Kong Polytech Univ Dept Civil & Environm Engn Hong Kong Peoples R China Chinese Acad Engn Beijing 100088 Peoples R China Univ Tokyo Grad Sch Engn Dept Architecture Bldg Mat Engn Lab Tokyo 1138654 Japan

China currently accounts for over 25% of global anthropogenic carbon emissions. Cutting down the carbon emissions of the construction industry is a major task for achieving the carbon neutrality goal in China. However, research on benchmarks and probability distribution models for China's embodied carbon emissions remains insufficient. To address this gap, this study defined "permanent carbon" by distinguishing the low time- variability part of embodied carbon emissions in buildings. Based on samples of 114 buildings in China, statistical and regression methods were utilized to construct a prior probability distribution model for permanent carbon of concrete structures, considering differences in building types. By applying Bayesian updating methods, posterior distributions were obtained based on latest region-specific information, addressing the issue of outdated data over time. Taking the East China region as an example, we found that the regional adjustment significantly affected carbon emission estimates, with varying adjustment factors for different building types. Transportation carbon emission benchmarks were influenced by transportation modes and distances, while distribution types remained stable. This study employs the Bayesian updating method in a novel way to help establish carbon emission benchmarks, support the formulation of carbon reduction targets, and aid the low carbon design during the early stage of building projects.

关键词： Concrete structures Permanent carbon Probability distribution model Carbon benchmark Regional adjustment

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Rigidity and quantitative stability for partially overdetermined problems and capillary CMC hypersurfaces

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CALCULUS OF VARIATIONS AND PARTIAL DIFFERENTIAL EQUATIONS 2024年第5期63卷 125-125页

作者： Jia, xiaohan Lu, Zheng xia, Chao Zhang, xuwen Southeast Univ Sch Math Nanjing 211189 Peoples R China Xiamen Univ Sch Math Sci Xiamen 361005 Peoples R China Albert Ludwigs Univ Freiburg Math Inst D-79104 Freiburg Im Breisgau Germany Goethe Univ Inst Math D-60325 Frankfurt Germany

In this paper, we first prove a rigidity result for a Serrin-type partially overdetermined problem in the half-space, which gives a characterization of capillary spherical caps by the overdetermined problem. In the second part, we prove quantitative stability results for the Serrin-type partially overdetermined problem, as well as capillary almost constant mean curvature hypersurfaces in the half-space.

关键词： 35N25 53A10 35B35 35A23

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