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Prototype-based classifier learning for long-tailed visual recognition

science China(information sciences) 2022年第6期65卷 62-76页

作者： Xiu-Shen WEI Shu-Lin XU Hao CHEN Liang XIAO Yuxin PENG School of Computer Science and Engineering Nanjing University of Science and Technology State Key Laboratory of Integrated Services Networks Xidian University Key Lab of Intelligent Perception and Systems for High-Dimensional Information of Ministry of Education and Jiangsu Key Lab of Image and Video Understanding for Social Security Wangxuan Institute of Computer Technology Peking University

In this paper, we tackle the long-tailed visual recognition problem from the categorical prototype perspective by proposing a prototype-based classifier learning(PCL) method. Specifically, thanks to the generalization ability and robustness, categorical prototypes reveal their advantages of representing the category semantics. Coupled with their class-balance characteristic, categorical prototypes also show potential for handling data imbalance. In our PCL, we propose to generate the categorical classifiers based on the prototypes by performing a learnable mapping function. To further alleviate the impact of imbalance on classifier generation, two kinds of classifier calibration approaches are designed from both prototype-level and example-level aspects. Extensive experiments on five benchmark datasets, including the large-scale iNaturalist, Places-LT,and ImageNet-LT, justify that the proposed PCL can outperform state-of-the-arts. Furthermore, validation experiments can demonstrate the effectiveness of tailored designs in PCL for long-tailed problems.

关键词： long-tailed distribution categorical prototype classifier generation classifier calibration class imbalance

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Critical Factors of Immersive Learning in Higher Education: A systematic Literature Review 10

Critical Factors of Immersive Learning in Higher Education: ...

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10th International Conference on ICT for Smart Society, ICISS 2023

作者： Sunardi Meyliana Ramadhan, Arief Rosmansyah, Yusep Bina Nusantara University BINUS Graduate Program Doctor of Computer Science Computer Science Department Jakarta Indonesia School of Information System Bina Nusantara University Information System Departement Jakarta Indonesia School of Computing Telkom University Bandung Indonesia School of Electrical Engineering and Informatics Bandung Institute of Technology Bandung Indonesia

ISBN: (纸本)9798350339543

Immersive learning has gained significant attention with the rising trend of spatial computing, particularly in the after-pandemic era. Numerous research has explored the potential of immersive learning in higher education, primarily on the educational sector. However, prior research has frequently focused too narrowly on the effects of technology and neglected to address the crucial element influencing successful immersive learning in higher education. This study seeks to pinpoint the crucial element contributing to the development of immersive learning experiences. The methodology uses a systematic literature review (SLR) from 2018 up to 2023 to investigate the critical factors of immersive Learning in Higher Education. From the 728 papers initially retrieved, 274 were considered potential candidates, and ultimately, 86 articles were selected based on their relevance to the research question. The results reveal that the critical factors include learning design, technology, immersion, engagement, interactivity, and usability. Academic interests will benefit from this SLR's consequences as institutions create models for designing suitable immersive learning, especially within the context of higher education. © 2023 IEEE.

关键词： E-learning

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Research on Rolling Bearing Fault Diagnosis Based on Classification Generative Adversarial Network

Research on Rolling Bearing Fault Diagnosis Based on Classif...

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UNIfied Conference of International Workshop on Defence Applications of Multi-Agent systems, DAMAS 2023, International Conference on Maintenance engineering, IncoME-V 2023, International conference on the Efficiency and Performance engineering Network, TEPEN 2023

作者： Kang, Ma Hongjun, Wang School of Mechanical and Electrical Engineering Beijing Information Science and Technology University Beijing100192 China Beijing International Science and Technology Cooperation Base for Intelligent Sensing and Control of High-End Equipment Beijing100192 China Beijing Key Laboratory of Measurement and Control of Electromechanical System Beijing100192 China

ISBN: (纸本)9783031494123

In practical engineering, it is usually difficult to label monitoring data, and the fault diagnosis accuracy is not high in strong noise environment. To solve the above problems, this paper uses Cwt-CatGAN method to process signals and diagnose faults. In this method, CWT is first used to convert one-dimensional original vibration signals into two-dimensional time–frequency graphs as the input of classification generation admixture network. Then, the CatGAN model is obtained through the adversarial training process, and fake samples similar to the extraction distribution of CWT are generated. Finally, the input samples are clustered into certain categories. In addition, the performance of the Cwt-CatGAN method is verified by using the classical rotating machine data set, the experiment is compared with the unsupervised fault diagnosis model CatAAE. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Failure analysis

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Coupling Co-Ni phosphides for energy-saving alkaline seawater splitting

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Nano Research 2024年第6期17卷 4797-4806页

作者： Weijia Liu Wenxian Liu Tong Hou Junyang Ding Zhigui Wang Ruilian Yin Xingyuan San Ligang Feng Jun Luo Xijun Liu State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Nonferrous Metals and Featured MaterialsMOE Key Laboratory of New Processing Technology for Nonferrous Metals and MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Hebei Key Laboratory of Optic-electronic Information and Materials the College of Physics Science and TechnologyHebei UniversityBaoding 071002China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110China

The coupling of energy-saving small molecule conversion reactions and hydrogen evolution reaction(HER)in seawater electrolytes can reduce the energy consumption of seawater electrolysis and mitigate chlorine corrosion ***,the fabrication of efficient multifunctional catalysts for this promising technology is of great ***,a heterostructured catalyst comprising CoP and Ni_(2)P on nickel foam(CoP/Ni_(2)P@NF)is reported for hydrazine oxidation(HzOR)-assisted alkaline seawater *** coupling of CoP and Ni_(2)P optimizes the electronic structure of the active sites and endows excellent electrocatalytic performance for HzOR and ***,the two-electrode HzOR-assisted alkaline seawater splitting(OHzS)cell based on the CoP/Ni_(2)P@NF required only 0.108 V to deliver 100 mA·cm^(−2),much lower than 1.695 V for alkaline seawater electrolysis ***,the OHzS cell exhibits satisfactory stability over 48 h at a high current density of 500 mA·cm^(−2).Furthermore,the CoP/Ni_(2)P@NF heterostructured catalyst also efficiently catalyzed glucose oxidation,methanol oxidation,and urea oxidation in alkaline seawater *** work paves a path for high-performance heterostructured catalyst preparation for energy-saving seawater electrolysis for H_(2) production.

关键词： seawater splitting heterostructure electrocatalysis hydrazine oxidation reaction hydrogen evolution reaction

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Collaborative Searching Strategy for Multi-Amphibious Spherical Robots in 3D underwater environments 20

Collaborative Searching Strategy for Multi-Amphibious Spheri...

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20th IEEE International Conference on Mechatronics and Automation, ICMA 2023

作者： Feng, Shilong Guo, Shuxiang Yang, Dan Li, Ao Yin, He Liu, Meng The Key Laboratory of Convergence Biomedical Engineering System and Healthcare Technology The Ministry of Industry and Information Technology School of Life Science Beijing Institute of Technology No.5 Zhongguancun South Street Haidian District Beijing100081 China Southern University of Science and Technology The Department of Electronic and Electrical Engineering Guangdong Shenzhen518055 China

ISBN: (纸本)9798350320831

An improved multi-robot cooperative strategy based on the improved artificial bee colony algorithm is proposed for the task of underwater multi-robot cooperative area target search. The strategy consists of three stages: cruising stage, building capture alliance stage, and cooperative search stage. In the cruising stage, robot adopts the improved random walk algorithm for aimless cruising. In the building capture alliance stage, robot uses an auction algorithm for the assignment of search tasks. In the cooperative search stage, robot adopts the improved artificial bee colony algorithm for cooperative search of targets. Furthermore, simulations are conducted, and the results demonstrate that the proposed strategy can effectively guide multiple robots to perform area target search in unknown 3D underwater environments. © 2023 IEEE.

关键词： Multipurpose robots

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Fabry-Pérot Laser Diode for WDM-PON with Temperature-insensitive Laser Spectral Envelope

Fabry-Pérot Laser Diode for WDM-PON with Temperature-insens...

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CLEO: science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Zhang, Ruigang Han, Yu Tian, Qi Xian, Qingyun Liu, Deming Zheng, Shuang Zhang, Minming School of Optical and Electronic Information Huazhong University of Science and Technology Hubei Wuhan430074 China National Engineering Research Center for Next Generation Internet Access System Hubei Wuhan430074 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Hubei Wuhan430074 China

We propose a novel Fabry-Pérot laser diode with temperature-insensitive laser spectral envelope. By introducing a temperature-insensitive optical filter structure into the laser diode resonator, the laser spectra... 详细信息

关键词： Fabry-Perot interferometers

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Terahertz parametric upconversion detection based on a KTiOAsO4 crystal

Terahertz parametric upconversion detection based on a KTiOA...

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2024 Conference on Lasers and Electro-Optics/Pacific Rim, CLEO-PR 2024

作者： Ming, Na Fan, Shuzhen Zhang, Xingyu Chen, Xiaohan Cong, Zhenhua Liu, Zhaojun Guo, Quanxin Guo, Liyuan Jiao, Binzhe Yuan, Jiasheng Wang, Kaiyu Liu, Naichang Center for Optics Research and Engineering Key Laboratory of Laser and Infrared System Ministry of Education Shandong University Qingdao266237 China School of Information Science and Engineering Shandong Provincial Key Laboratory of Laser Technology and Application Shandong University Qingdao266237 China

Highly sensitive terahertz frequency upconversion detection was demonstrated with a KTiOAsO4 crystal. The detectable THz frequency ranges were 3.6-3.9, 4.2-4.4, and 4.8-5.0 THz. The minimum detectable terahertz energy...

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Improved subarray coherence factor beamformer for ultrasound plane-wave imaging

Improved subarray coherence factor beamformer for ultrasound...

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2023 International Congress on Ultrasonics, ICU Beijing 2023

作者： Guan, Huchang Jiang, Chen Xu, Kailiang Ta, Dean Department of Biomedical Engineering School of Information Science and Technology Fudan University Shanghai200438 China State Key Laboratory of Integrated Chips and Systems Fudan University Shanghai201203 China Micro-nano System Center School of Information Science and Technology Fudan University Shanghai200438 China State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Fudan University China

Coherent plane-wave compounding (CPWC) has gained significant traction in medical ultrasound imaging. The coherence factor (CF) weighting algorithm, a classical adaptive beamforming strategy, aims to enhance the CPWC imaging lateral resolution, but it also noticeably compromises the speckle patterns, *** a low signal-to-noise ratio (SNR). Delay multiply and sum (DMAS) has been proposed to reduce side lobes. However, the reconstructed image quality with DMAS is limited in terms of resolution and speckle level. In the present study, an improved subarray coherence factor (ISCF) algorithm is introduced by combining CF with DMAS strategies, aiming to improve the contrast and resolution while preserving the speckle level. The performance of the proposed algorithm is evaluated using simulation and phantom datasets. Results indicate that the resolution and the contrast of ISCF can be improved by 41.6% and 79.4%, respectively;compared with delay and sum (DAS) algorithm. Additionally, the resolution and the speckle level of ISCF can be improved by 10.6% and 35.7% compared with CF algorithm, respectively. The proposed ISCF algorithm outperforms CF in terms of resolution, contrast, and speckle preservation. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Ultrasonic imaging

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Inverse Design of Digital Mode (De)multiplexer with Large Fabrication Tolerance Using the Modified Adjoint Method

Inverse Design of Digital Mode (De)multiplexer with Large Fa...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Wang, Kaiyuan Li, Yunlong Hu, Qiaomu Liu, Deming Zheng, Shuang Zhang, Minming School of Optical and Electronic Information Huazhong University of Science and Technology Hubei Wuhan430074 China National Engineering Research Center for Next Generation Internet Access System Hubei Wuhan430074 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Hubei Wuhan430074 China

A three-channel mode (de)multiplexer with fabrication tolerance using the Modified adjoint method is proposed and experimentally demonstrated, providing insertion losses © Optica Publishing Group 2024 © 2024... 详细信息

ISBN: (纸本)9781957171395

关键词： Insertion losses

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An artificial neural network chip based on two-dimensional semiconductor

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science Bulletin 2022年第3期67卷 270-277页

作者： Shunli Ma Tianxiang Wu Xinyu Chen Yin Wang Hongwei Tang Yuting Yao Yan Wang Ziyang Zhu Jianan Deng Jing Wan Ye Lu Zhengzong Sun Zihan Xu Antoine Riaud Chenjian Wu David Wei Zhang Yang Chai Peng Zhou Junyan Ren Wenzhong Bao State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China State Key Laboratory of ASIC and System School of Information Science and TechnologyFudan UniversityShanghai 200433China Shenzhen Sixcarbon Technology Shenzhen 518106China School of Electronic and Information Engineering Soochow UniversitySuzhou 215006China Department of Applied Physics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Recently,research on two-dimensional(2D)semiconductors has begun to translate from the fundamen-tal investigation into rudimentary functional *** this work,we unveil the first functional MoS2 artificial neural network(ANN)chip,including multiply-and-accumulate(MAC),memory and activation function *** MoS2 ANN chip is realized through fabricating 818 field-effect transistors(FETs)on a wafer-scale and high-homogeneity MoS2 film,with a gate-last process to realize top gate structured FETs.A 62-level simulation program with integrated circuit emphasis(SPICE)model is utilized to design and optimize our analog ANN *** demonstrate a practical application,a tactile digit sensing recognition was demonstrated based on our ANN *** training,the digit recognition rate exceeds 97%.Our work not only demonstrates the protentional of 2D semiconductors in wafer-scale inte-grated circuits,but also paves the way for its future application in AI computation.

关键词： MoS_(2) Two-dimensional(2D)FETs Artificial neural network(ANN) Multiply-and-accumulate(MAC) Circuits

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