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A multichannel optical computing architecture for advanced machine vision

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Light(Science & Applications) 2022年第9期11卷 2235-2247页

作者： ZHIHAO XU xiaoyun yuan TIANKUANG ZHOU LU FANG Sigma Laboratory Department of Electronic EngineeringTsinghua UniversityBeijingChina Beijing National Research Center for Information Science and Technology(BNRist) BeijingChina Tsinghua Shenzhen International Graduate School ShenzhenChina Institute for Brain and Cognitive Science Tsinqhua University(THUIBCS)BeijingChina

Endowed with the superior computing speed and energy efficiency,optical neural networks(ONNs)have attracted ever-growing attention in recent *** optical computing architectures are mainly single-channel due to the lack of advanced optical connection and interaction operators,solving simple tasks such as hand-written digit classification,saliency detection,*** limited computing capacity and scalability of single-channel ONNs restrict the optical implementation of advanced machine ***,we develop Monet:a multichannel optical neural network architecture for a universal multiple-input multiple-channel optical computing based on a novel projection-interference-prediction framework where the inter-and intra-channel connections are mapped to optical interference and *** our Monet,optical interference patterns are generated by projecting and interfering the multichannel inputs in a shared *** patterns encoding the correspondences together with feature embeddings are iteratively produced through the projection-interference process to predict the final output *** the first time,Monet validates that multichannel processing properties can be optically implemented with high-efficiency,enabling real-world intelligent multichannel-processing tasks solved via optical computing,including 3D/motion *** experiments on different scenarios demonstrate the effectiveness of Monet in handling advanced machine vision tasks with comparative accuracy as the electronic counterparts yet achieving a ten-fold improvement in computing *** intelligent computing,the trends of dealing with real-world advanced tasks are *** the capacity and scalability limitations of single-channel ONN and further exploring the multichannel processing potential of wave optics,we anticipate that the proposed technique will accelerate the development of more powerful optical Al as critical support for modern advanced mach

关键词： computing multichannel projection

Effect of Cr on mechanical properties and corrosion behaviors of Fe-Mn-C-Al-Cr-N TWIP steels

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Journal of Materials Science & Technology 2017年第12期33卷 1555-1560页

作者： xiaoyun yuan Yang Zhao Xing Li Liqing Chen State Key Laboratory of Rolling and Automation Northeastern University School of Materials Science and Engineering Northeastern University

By using scanning electron microscopy（SEM） equipped with electron back-scattered diffraction（EBSD）system, transmission electron microscopy（TEM） and Corr Test4 electrochemical workstation, effects of chromium content（1.35 wt% - 3.95 wt%） on the mechanical properties and anti-corrosion behaviours of high manganese Fe-Mn-C-Al-Cr-N twinning-induced plasticity（TWIP） steels were studied. The results show that Cr content has an obvious influence on the mechanical properties and fracture behaviors of the high manganese TWIP steels. The yield and ultimate tensile strengths of the steel sheets were improved with increasing Cr content while the elongation was reduced. In addition, with the increase of Cr content, the fracture mode changed from ductile fracture pattern with coarse dimples and tear ridges（Cr content ≤ 2.35%） to intergranular fracture（when Cr content is 3.95%）. Furthermore, Cr content has a tremendous effect on anti-corrosion behaviors of the high manganese TWIP steels. The increase of Cr content enhanced the corrosion resistance of the annealed steel sheets by improving the proportion of low-angle boundary.

关键词： High-manganese steel TWIP steel Cr content Mechanical properties Corrosion resistance

Effect of Isothermal Temperature on Microstructure and Mechanical Properties of High Al–Low Si TRIP Steel

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 389-394页

作者： Yang Zhao Qiangjun Yan Liqing Chen xiaoyun yuan School of Materials and Metallurgy Northeastern University New Product Development and Application Center Nanjing Iron and Steel Co. Ltd State Key Laboratory of Rolling and Automation Northeastern University

In this study, the effect of isothermal temperature on microstructure and mechanical properties of a high Al-low Si TRIP steel was investigated using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, electron back scattered diffraction, and tensile test. The results show that typical microstructure containing ferrite, bainite, and retained austenite can be obtained when two-stage heat treatment process was utilized. When annealing temperature is 840 ℃ and austempering temperature is 400 ℃, the tensile strength is 542 MPa and the product of strength and elongation is 17,685 MPa%. The morphologies and stability of the retained austenite in low silicon/high aluminum TRIP steel were finally discussed.

关键词： TRIP steel Microstructure Mechanical properties Isothermal temperature Retained austenite

Photonic neuromorphic architecture for tens-of-task lifelong learning

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Light(Science & Applications) 2024年第3期13卷 519-530页

作者： yuan Cheng Jianing Zhang Tiankuang Zhou Yuyan Wang Zhihao Xu xiaoyun yuan Lu Fang Sigma Laboratory Department of Electronic EngineeringTsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Beijing 100084China Institute for Brain and Cognitive Science Tsinghua University(THUIBCS)Beijing 100084China

Scalable,high-capacity,and low-power computing architecture is the primary assurance for increasingly manifold and large-scale machine learning *** electronic artificial agents by conventional power-hungry processors have faced the issues of energy and scaling walls,hindering them from the sustainable performance improvement and iterative multi-task *** to another modality of light,photonic computing has been progressively applied in high-efficient neuromorphic ***,we innovate a reconfigurable lifelong-learning optical neural network(L2 ONN),for highly-integrated tens-of-task machine intelligence with elaborated algorithm-hardware *** from the inherent sparsity and parallelism in massive photonic connections,L2 ONN learns each single task by adaptively activating sparse photonic neuron connections in the coherent light field,while incrementally acquiring expertise on various tasks by gradually enlarging the *** multi-task optical features are parallelly processed by multi-spectrum representations allocated with different *** evaluations on freespace and on-chip architectures confirm that for the first time,L2 ONN avoided the catastrophic forgetting issue of photonic computing,owning versatile skills on challenging tens-of-tasks(vision classification,voice recognition,medical diagnosis,etc.)with a single ***,L2 ONN achieves more than an order of magnitude higher efficiency than the representative electronic artificial neural networks,and 14×larger capacity than existing optical neural networks while maintaining competitive performance on each individual *** proposed photonic neuromorphic architecture points out a new form of lifelong learning scheme,permitting terminal/edge AI systems with light-speed efficiency and unprecedented scalability.

关键词： life neural versatile

A modular hierarchical array camera

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Light(Science & Applications) 2021年第4期10卷 542-550页

作者： xiaoyun yuan Mengqi Ji Jiamin Wu David JBrady Qionghai Dai Lu Fang Departm ent of Electronic Engineering Tsinghua UniversityBeijing 100084China Department of Automation Tsinghua UniversityBeijing 100084China College of Optical Sciences University of ArizonaTucsonAZ 85721USA lnstitute of Brain and Cognitive Science Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China

Array cameras removed the optical limitations of a single camera and paved the way for high-performance imaging via the combination of micro-cameras and computation to fuse multiple aperture ***,existing solutions use dense arrays of cameras that require laborious calibration and lack flexibility and *** by the cognition function principle of the human brain,we develop an unstructured array camera system that adopts a hierarchical modular design with multiscale hybrid cameras composing different *** computations are designed to collaboratively operate along both intra-and intermodule *** system can adaptively allocate imagery resources to dramatically reduce the hardware cost and possesses unprecedented flexibility,robustness,and *** scenes of real-world data were acquired to perform human-centric studies for the assessment of human behaviours at the individual level and crowd behaviours at the population level requiring highresolution long-term monitoring of dynamic wide-area scenes.

关键词： camera system removed

Generating 0.42 THz radiation from a second harmonic gyrotron

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Chinese Science Bulletin 2011年第28期56卷 3572-3574页

作者： FU WenJie YAN Yang LI xiaoyun yuan XueSong LIU ShengGang Terahertz Research Center School of Physical Electronics University of Electronic Science and Technology of China Chengdu 610054 China

Gyrotrons are high powered coherent electromagnetic radiation sources, and are considered to be available powerful sources that have the potential to bridge the so-called terahertz gap. In the University of Electronic Science and Technology of China, a second harmonic gyrotron has been designed, manufactured, and tested. The gyrotron generated radiation at a 0.423 THz frequency in 5μs pulses with an 8.1 Tesla magnetic field, with a power per pulse of about 4.4 kW. To date this is the highest frequency recorded for vacuum electronic devices in China. The gyrotron design, operation and measurements are presented.

关键词： THz辐射二次谐波回旋管电子科技大学真空电子器件中国科技脉冲功率出现频率

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一种高锰奥氏体TWIP钢的高温热变形与再结晶行为

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金属学报 2015年第6期51卷 651-658页

作者：袁晓云陈礼清东北大学轧制技术及连轧自动化国家重点实验室沈阳110819

在变形温度为1223~1423 K及应变速率为0.01~10 s-1的条件下,利用MMS-300热模拟试验机开展单道次压缩变形实验,结合SEM-EBSD和TEM等观察分析技术,研究了一种高锰奥氏体孪晶诱发塑性（TWIP）钢的高温热变形及再结晶行为,对其动态再结晶过... 详细信息

在变形温度为1223~1423 K及应变速率为0.01~10 s-1的条件下,利用MMS-300热模拟试验机开展单道次压缩变形实验,结合SEM-EBSD和TEM等观察分析技术,研究了一种高锰奥氏体孪晶诱发塑性（TWIP）钢的高温热变形及再结晶行为,对其动态再结晶过程中的组织演变规律及其与应力-应变曲线的相关性进行了分析和表征.结果表明,该高锰奥氏体TWIP钢的热变形行为对应变速率较敏感;当应变速率低于0.1 s-1时,热变形过程中发生动态再结晶;当应变速率高于1 s-1时,发生动态回复.通过回归计算建立了该高锰奥氏体TWIP钢的热变形本构方程,分析认为动态再结晶过程中的组织演变规律与其应力-应变曲线密切相关.随着应变量的增加,晶界迁移诱导再结晶形核;形变量进一步增加,产生大量亚晶界;相邻亚晶界上的位错攀移和滑移等运动使晶界合并,导致再结晶晶粒形成.

关键词： TWIP钢热变形动态再结晶本构方程组织演变

晶粒及晶界特征对高锰奥氏体TWIP钢抗腐蚀能力的影响

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金属学报 2016年第10期52卷 1345-1352页

作者：袁晓云陈礼清东北大学轧制技术及连轧自动化国家重点实验室沈阳110819

以一种高锰奥氏体孪晶诱发塑性（TWIP）钢为实验材料,采用700～1000℃保温20 min及800℃保温10～30 min的退火工艺获得了不同晶粒尺寸分布及晶界特征分布的再结晶组织,结合EBSD技术及动电位极化曲线测试,研究了晶粒度、晶粒均匀性及晶... 详细信息

以一种高锰奥氏体孪晶诱发塑性（TWIP）钢为实验材料,采用700～1000℃保温20 min及800℃保温10～30 min的退火工艺获得了不同晶粒尺寸分布及晶界特征分布的再结晶组织,结合EBSD技术及动电位极化曲线测试,研究了晶粒度、晶粒均匀性及晶界特征分布对该钢抗腐蚀能力的影响.结果表明,该高锰奥氏体TWIP钢的抗腐蚀能力受组织中的晶粒度及重位点阵（CSL）晶界分布比例的影响,二者的作用在再结晶的组织中因组织的均匀性不同而表现出明显差异.当再结晶过程刚刚结束,晶粒组织尚不均匀且未进入晶粒长大阶段时,平均晶粒尺寸对抗腐蚀能力的影响占主导地位.随着平均晶粒尺寸的增大,该TWIP钢的抗腐蚀能力下降.而当再结晶晶粒充分长大且晶粒尺寸分布均匀,CSL晶界所占的比例对其抗腐蚀能力的影响尤为显著.随着CSL晶界所占晶界比例的提高,该TWIP钢的抗腐蚀能力增加.

关键词：孪晶诱发塑性钢晶粒均匀性重位点阵晶界抗蚀性

Study and Design of the Semi-Active Suspension Controller for Vehicles

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Study and Design of the Semi-Active Suspension Controller fo...