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IEEE Transactions on Artificial Intelligence 2024年第5期5卷 2331-2341页

作者： Yu, Qianzi Zhu, Kai Wang, Wen Cao, Yang Kang, Yu University of Science and Technology of China Department of Automation School of Information Science and Technology Hefei230026 China Hefei Comprehensive National Science Center Institute of Artificial Intelligence Hefei230039 China Zhejiang University College of Computer Science and Technology State Key Lab of CAD&CG Hangzhou310027 China University of Science and Technology of China School of Information Science and Technology Hefei230026 China

Incremental object detection (IOD) aims to achieve simultaneous prediction of old and new samples on localization and classification when new concepts are provided. It is a challenging task due to the need for a joint interpretation of semantic and spatial information. While the existing work accomplishes the detector generalization with the help of annotated sample classes and bounding boxes, this article presents one astonishing finding on the unnecessity of new bounding boxes, which will significantly reduce the annotation cost and condition constraints in IOD. To enable the incremental detection process with image-level labels, we propose a multibranch decoupling scheme in which the representation, classification, and regression branches are customized to accommodate new concepts with class labels with different semantic levels. The regression branch is first frozen to ensure generalizable localization while maintaining the stability of representation optimization. Then, the representation branch is gradient-inverted to estimate the distribution drift from the old object-level set to the new image-level one, improving the effectiveness of feature updates in the absence of homogeneous semantic and spatial supervision. Finally, the classification branch is calibrated to balance the contribution of different images to the gradient, in which the frequency ratios of old instances and new images are calculated as a postprocessing factor for the logits margin. Extensive experiments on two standard incremental detection benchmarks demonstrate the above-par recognition and localization performance while reducing the burden on new class annotation, outperforming state-of-the-art methods by 2% and 3%, respectively. © 2023 IEEE.

关键词： Feature extraction

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Emerging hierarchical mesoporous materials of covalent organic frameworks

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science china Chemistry 2024年第9期67卷 2796-2802页

作者： Lingyan Huang Wenda Li Hongyi Zhang Shanzhe Ke Hao Chen Jianwei Fu Chengbin Jing Jiangong Cheng Shaohua Liu State Key Laboratory of Precision Spectroscopy/Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education) School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450052China State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Benefiting from abundant exposed active sites,minimized diffusion resistance of guest molecules,facilitated mass transfer process and enhanced storage capacity,covalent organic frameworks(COFs)have gained widespread scientific attention[1–4].Further construction of mesopores regarding pore engineering(pore size,pore geometry,pore volume,and framework compositions)in COFs can improve mass transport,accessibility as well as size-selectivity of the special guest moieties,thus exhibiting potential in catalysis,energy storage and separation and so on[5,6].

关键词： gained catalysis separation

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A hybrid nickel/iron-pyromellitic acid electrocatalyst for oxygen evolution reaction

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Nano Research 2024年第4期17卷 2481-2491页

作者： Guoqi Li Lin Li Wenlong Li Fusheng Li Chunze Yuan Nian Zhang Hui Zhang Tsu-Chien Weng School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China State Key Lab of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesDalian University of Technology(DUT)Dalian 116024China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

The migration of protons during the oxygen evolution reaction(OER)is a key factor that affects the performance of OER *** enhance proton transportation,we designed a catalyst based on nickel/iron-pyromellitic acid(NiFe-PMA)prepared by the electrochemical deposition *** catalyst exhibited a low overpotential of 188 mV at a current density of 10 mA·cm^(-2),a Tafel slope of 28.2 mV·dec^(-1),and long-term stability for 30 days with a current of 50 mA·cm^(-2).We characterized the NiFe-PMA catalyst using various techniques,including Fourier transform infrared(FTIR)spectroscopy,Raman spectroscopy,X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS),transmission electron microscopy(TEM),scanning electron microscopy(SEM),and inductively coupled plasma-optical emission spectrometry(ICP-OES).Our results showed that NiFe-PMA contains nickel,iron atoms,and both coordinated and uncoordinated carboxylate ***,XPS data confirmed that carboxylate ligands could adjust the outer electronic structure of metal ions,resulting in the high valence state of Ni in *** result of XAS indicated that the nickel atoms present in the catalyst might be easier to maintain a higher chemical *** investigations using kinetic isotope effects(KIEs)and proton inventory revealed that the uncoordinated carboxylic protons played a crucial role in receiving protons during the OER,which promoted the proton transfer of the rate-determining step of the *** novel electrocatalysts provide a new strategy for designing more active and cost-effective catalysts for the OER.

关键词： nickel/iron-pyromellitic acid oxygen evolution reaction kinetic isotope effects

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Conjugate ferrocene polymer derived magnetic Fe/C nanocomposites for electromagnetic absorption application

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Journal of Materials science & technology 2024年第8期175卷 125-131页

作者： Aming Xie Zhendong Ma Ziming Xiong Weijin Li Lai Jiang Qiu Zhuang Siyao Cheng Wei Lu School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory of Explosion&Impact and Disaster Prevention&Mitigation Army Engineering University of PLANanjing 210007China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Shanghai Key Lab.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China

Coordination bonds are relatively unstable compared to covalent bonds,and common carbon-based absorbing material precursors are bonded in the form of coordination *** this work,we have introduced ferrocene units into conjugated microporous polymers(CMP)in one step by Suzuki *** adjusting the proportion of ferrocene units,a series of magnetic Fe-C nanocomposites(Fe-P-XC)derived from conjugated ferrocene polymers without heteroatom doping(N,S,P,etc.)were *** Fe-P-2C composite has good absorption properties with minimum reflection loss at 4.4 GHz(-58.66 dB)and effective absorption bandwidth(EAB)of 6.28 GHz at 2.4 mm(11.72-18 GHz).Compared with the precursor materials formed by coordination bonds,the present work reveals the electromagnetic wave absorption mechanism of carbon-based materials without heteroatom doping through a simple and effective strategy.

关键词： Covalent bonds Suzuki reaction Conjugated ferrocene polymers Electromagnetic wave absorption

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Massively parallel algorithms for fully dynamic all-pairs shortest paths

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Frontiers of Computer science 2024年第4期18卷 201-203页

作者： Chilei WANG Qiang-Sheng HUA Hai JIN Chaodong ZHENG National Engineering Research Center for Big Data Technology and System Services Computing Technology and System LabCluster and Grid Computing LabSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China

1 Introduction In recent years,the Massively Parallel Computation(MPC)model has gained significant ***,most of distributed and parallel graph algorithms in the MPC model are designed for static graphs[1].In fact,the graphs in the real world are constantly *** size of the real-time changes in these graphs is smaller and more *** graph algorithms[2,3]can deal with graph changes more efficiently[4]than the corresponding static graph ***,most studies on dynamic graph algorithms are limited to the single machine ***,a few parallel dynamic graph algorithms(such as the graph connectivity)in the MPC model[5]have been proposed and shown superiority over their parallel static counterparts.

关键词： dynamic shortest gained

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Tentacles: A Middleware with Multi-Network Communication Reliability for Vehicle-Infrastructure Cooperative Autonomous Driving 100

Tentacles: A Middleware with Multi-Network Communication Rel...

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100th IEEE Vehicular technology Conference, VTC 2024-Fall

作者： Wu, Tianze Wang, Sa Bao, Yungang Shi, Weisong Chinese Academy of Sciences State Key Lab of Processors Institute of Computing Technology Beijing China University of Chinese Academy of Sciences Beijing China University of Delaware United States

ISBN: (纸本)9798331517786

Vehicle-Infrastructure Cooperative Autonomous Driving (CAD) is a new paradigm of autonomous driving, which relies on the cooperation between intelligent roads and autonomous vehicles. This paradigm has been shown to be safer and more efficient compared to the on-vehicle-only autonomous driving paradigm. Our real-world deployment data indicate that the effectiveness of Vehicle-Infrastructure CAD is constrained by the reliability and performance of commercial communication networks. This paper targets this exact problem and proposes Tentacles, a middleware to achieve high communication reliability between intelligent roads and autonomous vehicles, in the context of Vehicle-Infrastructure CAD. Specifically, Tentacles dynamically matches Vehicle-Infrastructure CAD applications and the underlying communication technologies based on varying communication performance and quality needs. Evaluation results confirm that Tentacles reduces deadline violations by more than 88%, significantly improving the reliability of Vehicle-Infrastructure CAD systems. © 2024 IEEE.

关键词： Autonomous vehicles

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TransCaller: An End-to-end Accelerated Transformer-based Nanopore Basecaller on GPUs

TransCaller: An End-to-end Accelerated Transformer-based Nan...

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2023 IEEE International Conference on Bioinformatics and Biomedicine, BIBM 2023

作者： Xu, Di Zhang, Peiheng Zhang, Yang Shi, Shunchen Li, Xueqi Institute of Computing Technology State Key Lab of Processors China University of Chinese Academy of Sciences China Institute of Intelligent Computing Technology Suzhou China

ISBN: (纸本)9798350337488

Basecalling is a crucial step in nanopore sequencing as it transforms the raw electrical signal obtained from the nanopore into a readable sequence. The accuracy of basecalling directly affects the quality and reliability of the sequenced data. Various algorithms and models are employed to perform accurate basecalling, with advancements in deep learning techniques. However, due to the difficulty of combining feature extraction capability, high parallelism and long sequence modeling capability of existing models, the accuracy and speed of basecalling model are still bottlenecks in data *** this paper, we present TransCaller, an end-to-end accelerated transformer-based nanopore basecaller model. TransCaller comprises a low-parameter electrical signal sampler, a fully transformer-based encoder integrating multiple algorithm-specific modules, and a CTC decoder enhanced with a filter. To further refine and enhance the TransCaller model, we introduce a three-stage pyramid model structure and leverage knowledge distillation techniques to balance the accuracy and speed. Experimental results on 9 datasets demonstrate that TransCaller achieves an average accuracy of 92.95%, surpassing the state-of-the-art Bonito sup model by a margin of 0.65% to 2.34%. Moreover, the distilled TransCallermodel showcases a remarkable 2.97× acceleration in inference speed compared to the original model, effectively catering to the variegated requirements of distinct inference speeds and precision levels across a wide spectrum of scenarios. © 2023 IEEE.

关键词： Basecalling GPUs Parallelism Transformer

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Iterative Channel Estimation for OTFS-based LEO-Sat Communication Using Comb-type ZC Sequences

Iterative Channel Estimation for OTFS-based LEO-Sat Communic...

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2024 IEEE Global Communications Conference, GLOBECOM 2024

作者： Shi, Haiwei Xing, Wang Zhou, Yiqing Zhang, Yu Zhou, Shuo Shi, Jinglin Institute of Computing Technology Cas State Key Lab of Processors Beijing China ShanghaiTech University School of Information Science and Technology Shanghai201210 China University of Chinese Academy of Sciences Beijing China Tsinghua University Department of Electronic Engineering Beijing100084 China

ISBN: (纸本)9798350351255

In low earth orbit satellite (LEO-Sat) communication systems based on orthogonal time frequency space (OTFS) modulation, existing channel estimation methods usually use high-power pilots, leading to a high peak-to-average power ratio (PAPR). In this paper, we propose a comb-type pilot based frame structure by inserting multiple identical Zadoff-Chu (ZC) sequences along the Doppler dimension. The ZC sequences are arranged at equal intervals in the delay dimension. The power of pilots is consistent with the power of data symbols, which can achieve low PAPR at the transmitter. At the receiver, based on the analyzed power distribution of the correlation function, we derive the power threshold to identify the received pilots. Then, an iterative ZC-sequences based channel estimation algorithm is proposed aided by data detection and interference cancellation. Through iterations, the data interference can be alleviated and estimation accuracy can be improved. Simulation results demonstrate that the proposed scheme can achieve superior channel estimation performance with low PAPR in the time domain. © 2024 IEEE.

关键词： Satellite communication systems

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Preparation of meter-scale Cu foils with decimeter grains and the use for the synthesis of graphene films

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Journal of Materiomics 2024年第1期10卷 1-6页

作者： Ruitao Jia Fangzhu Qing Shurong Wang Yuting Hou Changqing Shen Feng Hao Yang Yang Hongwei Zhu Xuesong Li School of Integrated Circuit Science and Engineering(Exemplary School of Microelectronics) University of Electronic Science and Technology of ChinaChengdu610054China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen518110China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu610054China PipeChina Southwest Pipeline Co. Ltd.Chengdu610041China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Chemical vapor deposition(CVD)is the most promising method for the preparation of high-quality and large-area graphene films,especially the epitaxial growth of graphene on large-area single-crystal Cu *** single-crystal Cu foils are normally achieved by thermally annealing the commercial poly-crystalline Cu foils,their size and therefore the size of graphene films grown on them are limited to the size of the reaction *** report a simple and feasible method to prepare large-area Cu foils with decimeter grains by thermally annealing the rolled-up Cu foils,where the Cu layers are separated by thin porous carbon fiber *** carbon fiber cloths prevent Cu layers from sticking to each other at high temperatures while do not block the gas *** such a way,the utilization efficiency of the reaction chamber is significantly improved,e.g.,0.2 m×(1e2)m Cu foils can be processed even in a 5 cm diameter quartz tube ***-quality graphene films grown on such Cu foils are then *** method may be suitable for the annealing of other metal foils to enlarge grain size and the synthesis of other two-dimensional materials on them such as h-BN.

关键词： Graphene Single-crystal Cu Chemical vapor deposition Synthesis

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Significant reduction of anisotropy in stress relaxation aging and mechanical properties improvement for 2195 Al-Cu-Li alloy subjected to plastic loading

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Chinese Journal of Aeronautics 2025年第1期38卷 217-234页

作者： Liwen ZHANG Heng LI Tianjun BIAN Changhui WU Yanfeng YANG State Key Lab of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Xi’an Aeronautical Polytechnic Institute Xi’an 710089China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Although the plastic loading can enhance creep deformation and yield strength,the anisotropic Stress Relaxation Aging(SRA)behavior and mechanism under plastic loading remain unclear,which presents a significant challenge in accurately shaping aluminum alloy *** this study,the SRA behavior of 2195-T4 Al-Cu-Li alloys were thoroughly studied under initial loading stresses within the elastic(210/250 MPa)and plastic(380/420 MPa)ranges at 180℃by stress relaxation and tensile tests as well as microstructure *** findings reveal that compared with those under elastic loadings,in-plane anisotropy(IPA)values of the stress relaxation amount,yield strength and fracture elongation under plastic loadings are reduced by 60%–80%,70%–90% and 72%–89%,***,IPA values of precipitate size in grains and PrecipitationFree Zones(PFZ)width at grain boundaries under plastic loading decrease by 31.4%and 94.4%*** results indicate plastic loading significantly weakens the anisotropic SRA behavior,owing to numerous uniformly distributed fine T1phases and small IPA values of both T1precipitates size and PFZ width in various loading *** with those of elastic loadingaged alloys,yield strength of plastic loading-aged alloys shows high strength-ductility because of the combined effect of closely dispersed fine T1precipitates,narrowed PFZ and numerous sheared and rotated T1phases at different locations during tensile *** uniformly distributed larger Kernel Average Misorientation(KAM)and Schmidt factor values of the plastic loading-aged alloy,as well as the cross-slip generated,also help to enhance the strength and ductility of the alloy.

关键词： Aluminum-lithium alloy Stress relaxation aging Precipitation-free zones In-plane anisotropy Stress relaxation

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