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Blockchain-Assisted Privacy-Preserving and Synchronized key Agreement for VDTNs

IEEE Transactions on Dependable and Secure computing 2025年

作者： Wang, Chenhao Ming, Yang Liu, Hang Feng, Jie Yang, Mengmeng Xiang, Yang Chang'an University School of Information Engineering Xi'an710064 China Xidian University State Key Laboratory of Integrated Service Networks Xi'an710071 China Commonwealth Scientific and Industrial Research Organization Australia Swinburne University of Technology Department of Computing Technologies VIC3122 Australia

With the continuous development of digitization evolutions, vehicular digital twin networks (VDTNs) facilitate traffic data and optimization results to be exchanged between the vehicle and digital twin as well as shared among a group of digital twins. However, the data exchange and group sharing processes take place in real-time over public communication channels, which suffer from various security and privacy threats. key agreement technologies are promising to enable secure data communications for entities, but the existing key agreement schemes generally fail to fulfill the requirements of synchronization, privacy, and entity management for VDTNs. Therefore, we propose a blockchain-assisted privacy-preserving and synchronized key agreement scheme for VDTNs. In the proposed scheme, the anonymous vehicle and digital twin can negotiate a secret session key in the case of synchronization to achieve secure data exchange. Meanwhile, digital twins are capable of utilizing synchronized state information to dynamically establish a common group encryption key but hold individual decryption keys, which guarantee the security of group sharing. Additionally, the proposed scheme is able to protect identity privacy and manage vehicles and digital twins with the assistance of blockchain and smart contract. The security analysis demonstrates that the proposed scheme provides security and privacy assurances for VDTNs. The performance evaluation indicates that it has excellent expressions in terms of efficiency, practicality, and smart contract consumption. © 2004-2012 IEEE.

关键词： Differential privacy

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On the deterioration of convergence rate of spectral differentiations for functions with singularities

arXiv

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arXiv 2025年

作者： Wang, Haiyong School of Mathematics and Statistics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China

Spectral differentiations are basic ingredients of spectral methods. In this work, we analyze the pointwise rate of convergence of spectral differentiations for functions containing singularities and show that the deteriorations of the convergence rate at the endpoints, singularities and other points in the smooth region exhibit different patterns. As the order of differentiation increases by one, we show for functions with an algebraic singularity that the convergence rate of spectral differentiation by Jacobi projection deteriorates two orders at both endpoints and only one order at each point in the smooth region. The situation at the singularity is more complicated and the convergence rate either deteriorates two orders or does not deteriorate, depending on the parity of the order of differentiation, when the singularity locates in the interior of the interval and deteriorates two orders when the singularity locates at the endpoint. Extensions to some related problems, such as the spectral differentiation using Chebyshev interpolation, are also discussed. Our findings justify the error localization property of Jacobi approximation and differentiation and provide some new insight into the convergence behavior of Jacobi spectral *** Codes 65D25, 41A10, 41A25 Copyright © 2025, The Authors. All rights reserved.

关键词： Chebyshev approximation

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On-machine laser polishing of diamond turned metal surfaces

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CIRP Annals 2025年

作者： Zhang, XinQuan Wu, JinChi Zhong, WenBin Zeng, WenHan Zhang, Zhe Ren, MingJun State Key Laboratory of Mechanical System and Vibration School of Machanical Engineering Shanghai China EPSRC Future Metrology Hub Centre for Precision Technologies School of Computing and Engineering University of Huddersfield Huddersfield United Kingdom

An on-machine laser polishing system is developed to suppress the periodic turning marks on diamond turned metal surface. By integrating laser polishing on an ultra-precision machine tool, this method enables high-efficiency non-contact polishing without taking off workpiece from the lathe. Molecular dynamics simulation and experimental validation prove the process’ capability to reduce surface roughness through atomic level material flow from peak to valley. Surface quality has been improved through effective suppression of the diffraction and rainbow effects after laser polishing, demonstrating a high-efficiency, low-cost and clean solution for high-end optical component manufacturing. © 2025 CIRP

关键词： Laser heating

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Incomplete crossing and semi-topological horseshoes

arXiv

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arXiv 2025年

作者： Cheng, Junfeng Yang, Xiao-Song School of Mathematics and Statistics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China

This paper enriches the topological horseshoe theory using finite subshift theory in symbolic dynamical systems, and develops an elementary framework addressing incomplete crossing and semi-horseshoes. Two illustrative examples are provided: one from the perturbed Duffing system and another from a polynomial system proposed by Chen, demonstrating the prevalence of semi-horseshoes in chaotic systems. Moreover, the semi-topological horseshoe theory enhances the detection of chaos and improves the accuracy of topological entropy estimation. Copyright © 2025, The Authors. All rights reserved.

关键词： Topology

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ThicknesVAE: Learning a Latera Prior for Clothed Human Body Reconsuction

ThicknesVAE: Learning a Latera Prior for Clothed Human Body ...

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2025 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2025

作者： Wu, Xiaotao Fan, Zhaoxin He, Huiguang Shen, Dinggang School of Biomedical Engineering State Key Laboratory of Advanced Medical Materials and Devices ShanghaiTech University Shanghai201210 China NeuBCI Group State Key Laboratory of Brain Cognition and Brain-inspired Intelligence Technology Institute of Automation Chinese Academy of Sciences Beijing China Beijing Advanced Innovation Center for Future Blockchain and Privacy Computing Institute of Artificial Intelligence Beihang University Beijing100191 China Beijing Academy of Blockchain and Edge Computing China Shanghai United Imaging Intelligence Co. Ltd. Shanghai200232 China Shanghai Clnical Research and Trial Center Shanghai201210 China

ISBN: (纸本)9798350368741

Sandwich-like structures have shown remarkable efficacy in clothed human reconstruction. However, these approaches often generate unrealistic side geometries due to inadequate handling of lateral regions. This paper addresses this limitation by incorporating the side geometry of clothed humans as a prior. We propose ThicknessVAE, a novel two-stage method that makes two key contributions: (1) We learn a prototype from point clouds for the lateral regions of clothed humans to extract common and detailed geometric features. (2) We utilize this prototype as a prior to transform geometric features into a thickness map associated with clothed human images, enabling refined normal integration for sandwich-like reconstruction methods. By seamlessly integrating our model into the sandwich-like reconstruction pipeline, we achieve highly realistic side views. Both qualitative and quantitative experiments demonstrate that our approach is comparable to state-of-the-art methods in terms of side-view realism. © 2025 IEEE.

关键词： 3D Human Reconsruction Normal Integraton Prior Learning

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Research of Wedge-Shaped Bow to Ship Side Collision Based on Quasi-static and Dynamic Experiments

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Journal of Offshore Mechanics and Arctic engineering 2025年第5期147卷 051701页

作者： Qiu, Xiaoming Zhao, Yanjie Wang, Deyu State Key Laboratory of Ocean Engineering Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration School of Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China National Key Laboratory of Ship Structural Safety China Ship Scientific Research Center Wuxi Jiangsu 214125 China

A wedge-shaped bow above the waterline of a small size striking ship will cause serious damage to the side of a large size struck ship. Therefore, a penetrating indenter with the shape of a small ship bow top was applied in the quasi-static penetration and collision experiments to study the side collision of the two different size ships. The side structure of the large size struck ship was also simplified as a typical frame structure consists of a girder, stiffeners, and an outer plate. Material stress–strain properties were derived from tensile testing. Quasi-static experiments employed a hydraulic penetrating system, while dynamic impacts utilized a drop-weight machine to generate displacement–force curves. The experimental results were compared with the numerical simulation ones. The structural deformation process and force curves of different impact positions and velocities were also compared. Traditional empirical formulae were evaluated against experimental and numerical datasets, revealing limitations in predictive accuracy. Therefore, a rapid estimation method was proposed, leveraging the arithmetic superposition of simplified structural analysis results. The applicability of this approach was systematically assessed by some comparison cases of different velocities and structures. This methodology offers a practical engineering tool in scenarios involving moderate velocities and un-complex structures.

关键词： Computer simulation Ships dynamics of structures Collisions (Physics) collision experiment structural mechanics and foundation Deformation Displacement Wedges Simulation reliability of offshore structures and pipelines force prediction different size ship collision Girders

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Triangle Matters! TopDyG: Topology-aware Transformer for Link Prediction on Dynamic Graphs 25

Triangle Matters! TopDyG: Topology-aware Transformer for Lin...

引用

34th ACM Web Conference, WWW 2025

作者： Zhang, Xin Cai, Fei Zheng, Jianming Pan, Zhiqiang Chen, Wanyu Chen, Honghui Chen, Chonghao National Key Laboratory of Information Systems Engineering National University of Defense Technology Changsha China State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi China College of Electronic Countermeasures National University of Defense Technology Hefei China

ISBN: (纸本)9798400712746

Dynamic graph link prediction is widely utilized in the complex web of the real world, such as social networks, citation networks, recommendation systems, etc. Recent Transformer-based link prediction methods on dynamic graphs not only fail to model the fine-grained structures such as triangles with the vanilla Transformers in the graph serialization process, but also amplify the imbalanced distribution of graphs because of their over-estimation of high-degree nodes. To tackle these issues, we propose a Topology-aware Transformer on Dynamic Graph (TopDyG) for link prediction, consisting of a topology injected Transformer (Ti-Transformer) and a mutual information learning (Mi-Learning). The Ti-Transformer explores the explicit structure of serialized graphs, capturing the topological features. The Mi-Learning mines the relationship between nodes by modeling the mutual information with a prior knowledge, alleviating the over-estimation of high-degree nodes when applying the Transformer-based models for the dynamic graph link prediction task. Extensive experiments on four public datasets containing both transductive and inductive settings present the superiority of our proposal. In particular, TopDyG presents an improvement of 43.27% and 28.75% against the state-of-the-art baselines in terms of NDCG and Jaccard, respectively. The advantages are especially obvious on the high-density graphs. © 2025 Copyright held by the owner/author(s).

关键词： Recommender systems

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Lagrangian simulation of bedload-sized particle trajectories at a 90° river confluence

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Earth Surface Processes and Landforms 2025年第6期50卷

作者： Ni, Yufang Moradi, Gelare Cao, Zhixian Lane, Stuart N. Changjiang River Scientific Research Institute Wuhan China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan China University of Lausanne Lausanne Switzerland

Whilst confluence hydrodynamics are now very well known, their morphodynamics are less so. This is particularly true for bedload transport, including the trajectories followed by bedload supplied to a confluence by the main channel or the tributary, and their interactions. Field measurement of this phenomenon is currently difficult. laboratory measurement allows study of gross effects, but not the detailed physics of the process. This paper applies a Lagrangian particle tracking model to a 90° discordant confluence, i.e. where the tributary enters the main channel at a height above the mainstream bed. The model was set up to represent the confluence of the Rhône and Avançon Rivers, Switzerland. The model is based upon a three-dimensional solution of the incompressible Navier-Stokes equations in the open-source toolbox OpenFOAM. It applies a Delayed Detached Eddy Simulation. Particle movement allows for coupled interactions between particles as well as between particles and the stream bed. Results show that as bedload arrives at the tributary mouth, there is size segregation. Some particles from the tributary fall rapidly to the mainstream bed and then travel along the main channel margin to the zone where bank-attached point bars commonly form. Others travel further into the main channel, notably if interactions between particles are allowed. The zone of maximum shear between the joining flows tends to have lower densities of particle tracks. There is sediment sorting at the junction with the very coarsest particles, due to interactions and momentum effects, and the very finest particles, due to greater ease of turbulent suspension, extending further into the main channel. © 2025 John Wiley & Sons Ltd.

关键词： Navier Stokes equations

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Metal-Organic frameworks for optical sensor arrays

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Progress in Materials Science 2025年 154卷

作者： Zhang, Xin Cui, Yuanjing Qian, Guodong State Key Laboratory of Silicon and Advanced Semiconductor Materials ZJU-Hangzhou Global Scientific and Technological Innovation Center School of Materials Science and Engineering Zhejiang University Hangzhou310030 China

Precisely identifying subtle structural distinctions among various analytes remains a crucial yet difficult endeavor, primarily due to their extensive diversity, structural resemblance, and the potential for mutual interference. Traditional sensors, which operate on the "lock-and-key" principle, offer high selectivity and specificity for detecting particular analytes. However, this design makes them unsuitable for the simultaneous detection of multiple analytes. Metal-organic frameworks (MOFs) have attracted considerable interest in the realm of optical sensor arrays due to their diverse metal nodes and ligands, as well as the guest species that can be encapsulated within their channels or pores. This versatility makes MOFs highly advantageous for developing multi-channel single-sensing-element sensor arrays. The primary emphasis of this comprehensive review is on the intrinsic structure-performance relationship and development status of MOF-based optical sensor arrays. First, this review offers a concise explanation of the underlying theory and operational steps involved in optical sensor arrays. Second, the construction strategies for cross-reactive sensing elements are thoroughly presented. Third, the applications of MOF-based optical sensor arrays in identifying and detecting target analytes are explored comprehensively. This includes their use in environmental monitoring, disease diagnosis, food quality assessment, and the analysis of complex systems. Finally, the existing limitations and future research opportunities concerning MOF-based optical sensor arrays are thoroughly examined. © 2025 Elsevier Ltd

关键词： Image matching

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Tunable Room-Temperature Phosphorescence in Hydrogen-Bonded Organic Crystals via H-Bonding Units

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Advanced Functional Materials 2025年

作者： Han, Xue Zheng, He-Qi Yang, Yu Cui, Yuanjing Qian, Guodong State Key Laboratory of Silicon and Advanced Semiconductor Materials ZJU-Hangzhou Global Scientific and Technological Innovation Center School of Materials Science and Engineering Zhejiang University Hangzhou310030 China

Organic room-temperature phosphorescence (RTP) materials with tunable emission colors, lifetime, and quantum yield have important implications for applications in optoelectronics, bioimaging, and anti-counterfeiting. Herein, a facile strategy is presented for multi-parameters switchable RTP by introducing second H-bonding units (SHUs) capable of adsorption and desorption, such as H2O and DMSO, into hydrogen-bonded organic crystals. It is found that the incorporation of H2O molecules into the HOC-PM-H2O structure establishes a robust hydrogen bonding network that stabilizes the triplet excited states, thereby suppressing non-radiative transitions and extending the phosphorescence lifetime to 904 ± 45 ms. In contrast, DMSO molecules in the HOC-PM-DMSO structure promote the separation of aggregate states, leading to a transition in phosphorescence from yellow-green to blue with a quantum yield of up to 63%. The RTP performance of HOC-PM-H2O and HOC-PM-DMSO can be reversibly switched by SHUs. By leveraging the temporal and spatial changes in lifetime and color, an information security system and afterglow displays activated by SHUs are developed. The SHUs-activated strategy not only provides a robust platform for revealing structure-property relationships but also offers a novel approach to designing advanced functional materials with specific luminescent properties. © 2025 Wiley-VCH GmbH.

关键词： Phosphorescence

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