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A survey on cross-user federated recommendation

science China(Information sciences) 2025年第4期68卷 7-32页

作者： Enyue YANG Yudi xiONG Wei YUAN Weike PAN Qiang YANG Zhong MING College of Computer Science and Software Engineering Shenzhen University School of Electrical Engineering and Computer Science The University of Queensland WeBank AI Lab WeBank Department of Computer Science and Engineering Hong Kong University of Science and Technology College of Big Data and Internet Shenzhen Technology University Guangdong Laboratory of Artificial Intelligence and Digital Economy (SZ)

Recommender systems are effective in mitigating information overload, yet the centralized storage of user data raises significant privacy concerns. Cross-user federated recommendation(CUFR) provides a promising distributed paradigm to address these concerns by enabling privacy-preserving recommendations directly on user devices. In this survey, we review and categorize current progress in CUFR, focusing on four key aspects: privacy, security, accuracy, and efficiency. Firstly,we conduct an in-depth privacy analysis, discuss various cases of privacy leakage, and then review recent methods for privacy protection. Secondly, we analyze security concerns and review recent methods for untargeted and targeted *** untargeted attack methods, we categorize them into data poisoning attack methods and parameter poisoning attack methods. For targeted attack methods, we categorize them into user-based methods and item-based methods. Thirdly,we provide an overview of the federated variants of some representative methods, and then review the recent methods for improving accuracy from two categories: data heterogeneity and high-order information. Fourthly, we review recent methods for improving training efficiency from two categories: client sampling and model compression. Finally, we conclude this survey and explore some potential future research topics in CUFR.

关键词： cross-user federated recommendation federated recommendation federated learning recommender systems user privacy

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Efficient generation of polarization multiplexed OAM using levitated metasurfaces

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Frontiers of physics 2025年第1期20卷 253-261页

作者： Sihan Cui xiaojun Huang Cuizhen Sun Helin Yang xiaoyan Li College of Communication and Information Engineering Xi’an University of Science and TechnologyXi’an 710054China Engineering Research Center of Smart Coal Mine Advanced Communication Technology Universities of Shaanxi ProvinceXi’an 710054China College of Physical Science and Technology Central China Normal UniversityWuhan 430079China College of Physical Science and Technology Northwestern Polytechnical UniversityXi’an 710129China

Dual-polarization(DP)vortex waves(VWs)are widely applied in optical,electromagnetic,and quantum science owing to their ability to simultaneously convey two distinct and non-interfering orbital angular momentums(OAMs).Here,we propose a lightweight levitated meta-atom to achieve 360°phase control with a difference of no more than 1°while maximizing the reflection *** combination with convergent phase modulation,a OAM metasurface array that facilitates the generation of DP VWs with high mode purity and low divergence angles was *** measured DP VW bearing mode l=1 had only 4°divergence angle and 84%mode purity at 5.8 ***,DP VWs with integer,fractional(l=1.5)and higher order(l=8)modes are discussed based on an OAM purity spectrum *** experimental results were consistent with the simulation results,demonstrating the practicality of the proposed DP OAM metasurface and its potential applications in the field of multithreaded communication systems.

关键词： dual-polarization orbital angular momentum low divergence angles high mode purity

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A blockchain-based privacy-preserving and collusion-resistant scheme(PPCR)for double auctions

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Digital Communications and Networks 2025年第1期11卷 116-125页

作者： Xuedan Jia Liangmin Wang Ke Cheng Pujie Jing xiangmei Song School of Computer Science and Communication Engineering Jiangsu UniversityZhenjiang 212013China School of Cyber Science and Engineering Southeast UniversityNanjing 211102China School of Computer Science and Technology Xidian UniversityXi’an 710071China

Electronic auctions(e-auctions)remove the physical limitations of traditional auctions and bring this mechanism to the general ***,most e-auction schemes involve a trusted auctioneer,which is not always credible in *** studies have applied cryptography tools to solve this problem by distributing trust,but they ignore the existence of *** this paper,a blockchain-based Privacy-Preserving and Collusion-Resistant scheme(PPCR)for double auctions is proposed by employing both cryptography and blockchain technology,which is the first decentralized and collusion-resistant double auction scheme that guarantees bidder anonymity and bid privacy.A two-server-based auction framework is designed to support off-chain allocation with privacy preservation and on-chain dispute resolution for collusion resistance.A Dispute Resolution agreement(DR)is provided to the auctioneer to prove that they have conducted the auction correctly and the result is fair and *** addition,a Concise Dispute Resolution protocol(CDR)is designed to handle situations where the number of accused winners is small,significantly reducing the computation cost of dispute *** experimental results confirm that PPCR can indeed achieve efficient collusion resistance and verifiability of auction results with low on-chain and off-chain computational overhead.

关键词： Privacy protection Collusion resistance Secure protocol Blockchain-based double auction Dispute resolution

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Study on Sensor Layout Method Based on Mutual Information 20

Study on Sensor Layout Method Based on Mutual Information

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20th International Conference on Natural Computation, Fuzzy Systems and Knowledge Discovery, ICNC-FSKD 2024

作者： Wang, xiaofan Liu, Zheng Sun, Dongming Zhu, Junjie Yao, Jie Xi'an university of technology College of Computer Science and Engineering Xi'an China

ISBN: (纸本)9798350356328

The diffusion of toxic gas caused by the leakage of stored high-pressure chemical gases will cause significant harm to the environment and residents. Therefore, it is crucial to trace the source of leakage and predict the dispersion range of leakage accidents quickly. When using diffusion models to predict poisonous gas leaks, errors are accumulated due to the influence of meteorological, terrain and other factors, which affects the prediction accuracy, Therefore, sensors need to be deployed to use the data captured as observation value to correct models. However, the high cost of arranging and maintaining toxic gas sensors makes it difficult to place a large number of them, so how to place a limited number of sensors in the optimal location is a hot research issue. In this paper, we propose a sensor optimization layout strategy based on the gradient of mutual information, which utilizes the mutual information between the concentration of poisonous gas and the release source at the detection location as an indicator, and avoids traversing the search to improve the search efficiency through the gradient-based sequence forward selection search strategy. The time complexity is reduced from O(n2) to O(n),and at the same time, comparative experiments are conducted with other optimization algorithms, which show that the gradient-based forward selection search strategy is similar to other optimization algorithms in terms of time spent, and is more accurate in terms of convergence than other optimization algorithms © 2024 IEEE.

关键词： Information leakage

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A novel lightweight metamaterial with ultra broadband electromagnetic wave absorption induced by three-dimensional CNTs conductive-coated arrays

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science China(Technological sciences) 2023年第3期66卷 881-888页

作者： ZHOU Qian SHI TianTian XUE Bei GU ShengYue REN Wei YE Fang FAN xiaoMeng ZHANG Yuxin QI Chenxi DU LiFei College of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China College of Materials Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072China

Lightweight metamaterials for broadband electromagnetic wave absorption have become a significant requirement for electromagnetic interference and stealth *** this study,a novel lightweight metamaterial absorber with three-dimensional(3D)carbon nanotubes(CNTs)conductive-coated arrays is designed and fabricated through 3D printing and dipping process,which realized less than-10 dB reflection loss in the frequency range of 7.0–40 *** effect of the sheet resistance of CNTs conductive coatings and geometric parameters of meta-structure on the frequency-dependent absorption properties is investigated,and the improved absorbing efficiency is discussed based on the synergy effect of multiscale structures of 3D conductive-coated ***,the volume of the proposed ultra broadband absorber is reduced by approximately 60.5%compared with that of the dense plate structure,indicating a significant lightening with efficient absorbing ***,the absorption bandwidth and intensity of the proposed absorber have insensitive changes with the variation of incident ***,an ultra broadband electromagnetic absorption is designed and realized,indicating a promising lightweight ultra broadband electromagnetic absorbing candidate for lightweight metamaterial absorbers.

关键词： 3D conductive coating lightweight absorber metamaterials broadband absorption

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Literature overview of basic characteristics and flotation laws of flocs

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 943-958页

作者： Wanzhong Yin Yu xie Zhanglei Zhu School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China College of Chemistry and Chemical Engineering Xi’an University of Science and TechnologyXi’an 710054China

Flocculation flotation is the most efficient method for recovering fine-grained minerals,and its essence lies in flotation and recovery of *** physical characteristics of flocs are mainly determined by their apparent particle size and structure(density and morphology).Substantial researches have been conducted regarding the effect of floc characteristics on particle settling and water ***,the influence of floc characteristics on flotation has not been widely *** on the floc formation and flocculation flotation,this study reviews the fundamental physical characteristics of flocs from the perspectives of floc particle size and structure,summarizing the interaction between floc particle size and ***,it thoroughly discusses the effect of floc particle size and structure on floc floatability,further revealing the influence of floc characteristics on bubble collision and adhesion and elucidating the mechanisms of interaction between flocs and ***,it is observed that floc particle size is not the only factor influencing flocculation *** the appropriate apparent particle size range,flocs with a compact structure exhibit higher efficiency in bubble collision and adhesion during flotation,thereby resulting in enhanced flotation *** study aims to provide a reference for flocculation flotation,targeting the development of more efficient and refined flocculation flotation processes in the future.

关键词： flocs basic characteristics particle size and structure flotation laws bubbles

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Effects of Velocity Errors and Arrival Time Errors on the Location Accuracy of Microseismic Monitoring using Dual Waves

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Journal of engineering science and technology Review 2024年第5期17卷 48-54页

作者： Wang, Zhigang Wang, xiaoqing Yin, Shunlin College of Energy Engineering Xi'an University of Science and Technology Shaanxi Xi'an710054 China

The dual-wave location technique in microseismic monitoring can improve the location accuracy in areas outside the monitoring network and near the sensors, increasing the monitoring range with high precision. However, the response of seismic source location accuracy to input parameter errors remains unclear. In this study, numerical simulation methods were employed to understand the impact of wave velocity errors and arrival time errors on location accuracy when the P– S-wave location technique was used. Three points inside and three points outside a typical monitoring network were selected. Then, P waves and dual waves were applied to the seismic source locations, and the variations in location errors in the horizontal and vertical directions were analyzed as the relative wave velocity error ranged from −10% to 10% and the arrival time error ranged from −0.05 to 0.05 s. The results demonstrate that, when P waves are used, the location error outside the monitoring network increases rapidly and rapidly reaches an unacceptable range. By contrast, when dual waves were used, the ability of the microseismic monitoring system to handle input parameter errors was improved;the location errors increased linearly with increasing input parameter errors. Furthermore, for the same wave velocity error or arrival time error, the location results with the dual waves are relatively close to the actual seismic source location and stable, especially outside the network, where the reduction in location error could exceed 90%. The findings provide a scientific basis for accurately assessing and understanding the location results of microseismic monitoring with the use of dual waves. © (2024), (International Hellenic university - School of science). All rights reserved.

关键词： Microseismic monitoring

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Space charge characteristics and dielectric properties of PANI/PP-g-MAH/PP ternary composite

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High Voltage 2025年第1期10卷 178-185页

作者： Guochang Li Tianzhen Liu Zhenlu Gu xiaolong Chen Beibei Sun Yuanwei Zhu Shengtao Li Yanhui Wei College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdaoChina State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina

Space charge accumulation in polypropylene materials for direct current capacitor will accelerate the ageing of the materials,resulting in the degradation of their insulation ***,it will also affect the dielectric properties of the capacitor in a long *** this paper,a ternary composite of polyaniline(PANI)/maleic anhydride functionalised PP(PP-g-MAH)/polypropylene(PP)based on the PANI@dopamine(PDA)coating structure is constructed from two perspectives of PP matrix grafting and PANI nano *** method takes advantage of the high permittivity and good compatibility of PANI to improve the relative dielectric constant of the composite while introducing deep traps inside the composite to inhibit space charge accumulation *** experimental results show that with the increase in PANI content,the maximum relative permittivity can be increased by 62%.The addition of the appropriate amount of PANI can effectively inhibit the space charge *** relative dielectric constant of the composite decreases significantly due to the heteropolar space *** relative dielectric constant of the modified polyaniline composites decreased *** reduction rate decreased from 38%before modification to 12%after *** work has certain guiding significance for solving space charge problem of direct current capacitor.

关键词： composite composites dielectric

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Research on the mechanism of rockburst induced by mined coal-rock linkage of sharply inclined coal seams

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 929-942页

作者： xingping Lai Huicong Xu Pengfei Shan Qinxin Hu Weixi Ding Shangtong Yang Zhongming Yan College of Energy Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China State Key Laboratory of Green Low Carbon Development of Oil-rich Coal in Western China Xi’an 710054China College of Future Technology Xi’an University of Science and TechnologyXi’an 710054China Department of Civil and Environmental Engineering University of StrathclydeGlasgowG11XJUK

In recent years,the mining depth of steeply inclined coal seams in the Urumqi mining area has gradually *** deformation of mining coal-rock results in frequent *** has become a critical issue that affects the safe mining of deep,steeply inclined coal *** this work,we adopt a perspective centered on localized deformation in coal-rock mining and systematically combine theoretical analyses and extensive data mining of voluminous microseismic *** describe a mechanical model for the urgently inclined mining of both the sandwiched rock pillar and the roof,explaining the mechanical response behavior of key disaster-prone zones within the deep working face,affected by the dynamics of deep *** exploring the spatial correlation inherent in extensive microseismic data,we delineate the“time-space”response relationship that governs the dynamic failure of coal-rock during the progression of the sharply inclined working *** results disclose that(1)the distinctive coal-rock occurrence structure characterized by a“sandwiched rock pillar-B6 roof”constitutes the origin of rockburst in the southern mining area of the Wudong Coal Mine,with both elements presenting different degrees of deformation localization with increasing mining depth.(2)As mining depth increases,the bending deformation and energy accumulation within the rock pillar and roof show nonlinear *** localized deformation of deep,steeply inclined coal-rock engenders the spatial superposition of squeezing and prying effects in both the strike and dip directions,increasing the energy distribution disparity and stress asymmetry of the“sandwiched rock pillar-B3+6 coal seam-B6 roof”*** makes worse the propensity for frequent dynamic disasters in the working face.(3)The developed high-energy distortion zone“inner-outer”control technology effectively reduces high stress concentration and energy distortion in the surrounding *** implementation,the averag

关键词： steeply inclined coal seam localized deformation mechanism of induced rockburst prevention and control of rockburst

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Augmented FCN: rethinking context modeling for semantic segmentation

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science China(Information sciences) 2023年第4期66卷 193-211页

作者： Dong ZHANG Liyan ZHANG Jinhui TANG School of Computer Science and Engineering Nanjing University of Science and Technology College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics

The effectiveness of modeling contextual information has been empirically shown in numerous computer vision tasks. In this paper, we propose a simple yet efficient augmented fully convolutional network(AugFCN) by aggregating content-and position-based object contexts for semantic ***, motivated because each deep feature map is a global, class-wise representation of the input,we first propose an augmented nonlocal interaction(AugNI) to aggregate the global content-based contexts through all feature map interactions. Compared to classical position-wise approaches, AugNI is more efficient. Moreover, to eliminate permutation equivariance and maintain translation equivariance, a learnable,relative position embedding branch is then supportably installed in AugNI to capture the global positionbased contexts. AugFCN is built on a fully convolutional network as the backbone by deploying AugNI before the segmentation head network. Experimental results on two challenging benchmarks verify that AugFCN can achieve a competitive 45.38% mIoU(standard mean intersection over union) and 81.9% mIoU on the ADE20K val set and Cityscapes test set, respectively, with little computational overhead. Additionally, the results of the joint implementation of AugNI and existing context modeling schemes show that AugFCN leads to continuous segmentation improvements in state-of-the-art context modeling. We finally achieve a top performance of 45.43% mIoU on the ADE20K val set and 83.0% mIoU on the Cityscapes test set.

关键词： semantic segmentation context modeling long-range dependencies attention mechanism

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