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Blockchain-Based Dynamic Group Key Agreement Protocol for Ad Hoc Network

Chinese Journal of Electronics 2020年第3期29卷 447-454页

作者： ZHANG Qikun WANG Bingli ZHANG Xiaosong YUAN Junling WANG Ruifang Institute of Computer and Communication Engineering Zhengzhou University of Light Industry Department of Computer Science and Technology Tangshan University

Group key agreement(GKA) is one of the key technologies for ensuring information exchange security among group members. While GKA is widely used in secure multi-party computation, safety of resources sharing, and distributed collaborative computing. It still has some security flaws and limitations. We proposes a Blockchain-based dynamic Group key agreement(BDGKA) protocol. In contrast to prior works, BDGKA differs in several significant ways: 1) anonymous identity authentication-it can prevent privacy leaks; 2)traceability-it can track illegal operating entities; 3) load balancing-it balances computation and communication to each node, avoiding the breakdown of single-point and network bottlenecks. This protocol is proven secure under the hardness assumption of decision bilinear DiffieHellman. The performance analysis shows that it is more efficient than the referred works.

关键词： Dynamic group key agreement Blockchain Anonymous authentication Information exchange

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Semantic Prior Distillation with Vision Foundation Model for Enhanced Rapid Bone Scintigraphy Image Restoration

arXiv

引用

arXiv 2025年

作者： Liang, Pengchen Shi, Leijun Yao, Huiping Pu, Bin Chen, Jianguo Zhao, Lei Huang, Haishan Chen, Zhuangzhuang Xu, Zhaozhao Xu, Lite Chang, Qing Li, Yiwei Department of Nuclear Medicine Shanghai Children’s Hospital School of Medicine Shanghai Jiao Tong University Shanghai200062 China School of Microelectronics Shanghai University Shanghai201800 China Department of Ophthalmology Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai201800 China Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology 999077 Hong Kong School of Software Engineering Sun Yat-sen University Guangdong Province Zhuhai519000 China College of Computer Science and Electronic Engineering Hunan University Changsha410082 China School of Computer Science and Technology Henan Polytechnic University Henan Jiaozuo454000 China Department Shanghai Key Laboratory of Gastric Neoplasms Department of Surgery Shanghai Institute of Digestive Surgery Ruijin Hospital Shanghai Jiao Tong University School of Medicine Shanghai201800 China

Rapid bone scintigraphy is an essential tool for diagnosing skeletal diseases and tumor metastasis in pediatric patients, as it reduces scan time and minimizes patient discomfort. However, rapid scans often result in poor image quality, potentially affecting diagnosis due to reduced resolution and detail, which make it challenging to identify and evaluate finer anatomical structures. To address this issue, we propose the first application of SAM-based semantic priors for medical image restoration, leveraging the Segment Anything Model (SAM) to enhance rapid bone scintigraphy images in pediatric populations. Our method comprises two cascaded networks, fIR1 and fIR2, augmented by three key modules: a Semantic Prior Integration (SPI) module, a Semantic Knowledge Distillation (SKD) module, and a Semantic Consistency Module (SCM). The SPI and SKD modules incorporate domain-specific semantic information from a fine-tuned SAM, while the SCM maintains consistent semantic feature representation throughout the cascaded networks. In addition, we will release a novel Rapid Bone Scintigraphy dataset called RBS, the first dataset dedicated to rapid bone scintigraphy image restoration in pediatric patients. RBS consists of 137 pediatric patients aged between 0.5 and 16 years who underwent both standard and rapid bone scans. The dataset includes scans performed at 20 cm/min (standard) and 40 cm/min (rapid), representing a 2× acceleration. We conducted extensive experiments on both the publicly available endoscopic dataset and RBS. The results demonstrate that our method outperforms all existing methods across various metrics, including PSNR, SSIM, FID, and LPIPS. Copyright © 2025, The Authors. All rights reserved.

关键词： Pediatrics

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Effect of arc distance on temperature field and weld shape during double-sided arc welding

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China Welding 2009年第1期18卷 23-28页

作者：张广军张华军高洪明吴林 State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 Material Science and Engineering Harbin University of Science and Technology Harbin 150040

A new high efficiency welding method, double-sided double arc welding with double powers （DSAW-D）, is developed for thick plate of low alloy high strength steel in this study. It is well known that the thermal cycles have an important influence on the microstructure, shape, stress, distortion and mechanical property. The DSA W-D method can control the temperature field on a wide range by regulating the distance between two arcs, improve the microstructure and prevent hot and cold cracking of high strength steel. But at present, the effect of arc distance on the temperature field and shape is not clear. Therefore, the paper researches the effect of arc distance on the temperature field and weld pool during DSAW-D using finite element method. The transient temperature field of different arc distance in DSAW-D is calculated. To verify the numerical results, the temperature is measured by the thermo-couple and the calculated results agree approximately with experimental data. Farther, the thermal property and mutual effect of double-sided arcs are investigated. The temperature distributions and weld pool profile at different arc distances are obtained. The results show that arc distance is a very important factor to affect the heat process.

关键词： double-sided arc welding temperature field weld pool numerical simulation arc distance

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On-shot, high-intensity laser aberration measurements via ponderomotive electron ejection

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Physical Review A 2025年第1期111卷 013121-013121页

作者： A. E. Raymond S. Ravichandran S.-W. Bahk A. Longman L. Roso R. Fedosejevs C. Mileham I. A. Begishev S. Qin Laboratory for Laser Energetics Rochester University Rochester New York 14623-1299 USA Institute for Physical Science and Technology University of Maryland College Park Maryland 20742 USA Joint Quantum Institute University of Maryland College Park Maryland 20742 USA Lawrence Livermore National Laboratory Livermore California 94550 USA Departamento de Física Aplicada Universidad de Salamanca 37008 Salamanca Spain Electrical and Computer Engineering University of Alberta Edmonton Alberta T6G 2V4 Canada

We present a technique to assess the spatial aberration content of a focused multiterawatt laser when fired at full power. This method leverages the direct detection of electrons ponderomotively accelerated from the focal volume formed in a low-pressure gaseous backfill. Our results show that the spatial distribution of emitted electrons exhibits distinct features correlated to the laser aberration type and magnitude. This work represents progress toward the complete and accurate in situ spatiotemporal characterization of focused high-intensity lasers.

关键词： Aberrations

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Effect of competitive crystal growth on microstructural characteristics of directionally solidified nickel-based single crystal superalloy

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China Foundry 2022年第2期19卷 109-116页

作者： Mang Xu Xiao-qi Geng Xiang-long Zhang Guo-huai Liu Ye Wang Zhao-dong Wang Jing-jie Guo State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150040China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

Directionally solidified single crystal superalloy test bars were prepared by the spiral grain selection *** microstructural evolution and orientation characteristics of the starter block and spiral part were studied,and the influence of the competitive growth of crystals on the microstructural characteristics was *** results show that the divergent grain groups,with small size and randomly oriented grains,appear at the bottom of the start block due to the chilling effect,which is an important area for competitive *** the height of the starter block increases,the primary dendrite spacing increases,and the grain density decreases;furthermore,the proportion of grains with an orientation deflection angle less than 10°gradually ***<001>texture gradually becomes stronger as the height of the starter block increases,which indicates that the competitive growth of crystals gradually *** the initial stage of the crystal selection in the spiral part,the obstacle of adjacent grains and spiral passage is the main working *** grains located at the inner side of the front edge of the spiral passage have the growth *** single crystal screening process is achieved at about two-thirds of the spiral height,and the single crystal with the orientation deviation angle of 6.7°from the casting axis is prepared.

关键词： directional solidification Ni-based superalloy microstructural evolution spiral grain selector single crystal

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Deep Learning-Based Facial Emotion Recognition for Advanced Human-computer Interaction

Deep Learning-Based Facial Emotion Recognition for Advanced ...

引用

Advances in computer science, Electrical, Electronics, and Communication Technologies (CE2CT), International Conference on

作者： U. Chindiyababy Preetish Kakkar Jagadeesh Vedula Jumaniyozov Yunus Abdalov Umidbek Subhash Sharma Dept. of Information Technology SRM Valliammai Engineering College Chennai India Independent Researcher India Digital Transformation Lead Meghaz Inc. Houston Texas USA Department of psychology and pedagogy Urgench state university Urgench Uzbekistan Department of History Mamun university Khiva Uzbekistan Department of Computer Science and Engineering Tula's Institute Dehradun India

ISBN: (数字)9798331518578

ISBN: (纸本)9798331518585

Deep learning technology establishes advanced methods for enhancing Human-computer Interaction systems by providing machines with the ability to sense and understand human emotional states. The capability's value stems from its applications, including healthcare situations alongside virtual assistants, gaming interfaces, and educational platforms seeking personalized functions. We present a deep learning framework that unites multimodal data fusion with Convolutional Neural Network(CNN) to enhance emotion recognition systems while improving performance and interpretability. The proposed framework undergoes testing against three benchmark emotion datasets: FER2013, AffectNet, and CK+ dataset. Our experimental findings show that the proposed system delivers a 92.5% accuracy rate for emotion recognition which exceeds traditional unimodal models by a maximum of 12% improvement. Context-aware modeling achieves a 15% performance boost during real-world applications while lightweight architectural design reduces system processing requirements by 25% to support edge device runtime operations. Through explainable AI integration users can see how the model functions to make decisions therefore establishing both trust and ethical practices in use. This research delivers substantial progress in emotion recognition study through an approach that establishes a deployable system that maintains both operational effectiveness and ethical operations across multiple Human-computer Interaction application domains.

关键词： Human computer interaction Deep learning Emotion recognition Ethics Explainable AI Computational modeling Data integration Medical services Convolutional neural networks Context modeling

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A PROBABILISTIC PARKING PROCESS AND LABELED IDLA

arXiv

引用

arXiv 2025年

作者： Harris, Pamela E. Holleben, Thiago Mori, J. Carlos Martínez Priestley, Amanda Sullivan, Keith Wagenius, Per Department of Mathematical Sciences University of Wisconsin Milwaukee United States Department of Mathematics & Statistics Dalhousie University Canada H. Milton Stewart School of Industrial and Systems Engineering Georgia Institute of Technology United States Department of Computer Science The University of Texas Austin United States Department of Mathematics and Statistics University of Vermont United States

We introduce and study a new probabilistic variant of the classical parking protocol of Konheim and Weiss [29], which is closely related to Internal Diffusion Limited Aggregation, or IDLA, introduced in 1991 by Diaconis and Fulton [15]. In particular, we show that if one runs our parking protocol starting with a parking function whose outcome permutation (in the sense of the classical parking process of Konheim and Weiss) is the identity permutation, then we can compute the exact probability that all of the cars park. Furthermore, we compute the expected time it takes for the protocol to complete assuming all of the cars park, and prove that the parking process is negatively correlated. We also study statistics of uniformly random weakly increasing parking functions, a subset of parking functions whose outcome is the identity permutation. We give the distribution of the last entry, along with the probability that a specific set of cars is lucky, and the expected number of lucky *** Codes Primary: 60C05, Secondary: 60K35, 60J05 Copyright © 2025, The Authors. All rights reserved.

关键词： Probability distributions

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Facile Preparation of TiO_2 Nanoclusters on Graphene Templates for Photodegradation of Organic Compounds

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Journal of Materials science & technology 2015年第8期31卷 840-844页

作者： Zaixing Jiang Mingqiang Wang Hao Cheng Jun Li Aslan Husnu Haibao Lv Yongtao Yao Lu Shao Yudong Huang Mingdong Dong Department of Polymer Science and Technology School of Chemical Engineering and TechnologyHarbin Institute of Technology Interdisciplinary Nanoscience Center(iNANO) Aarhus University Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology

Graphene is the most attractive carbon-based material at present and attracting increasing attention as promising candidates for applications in numerous areas, because of its extraordinary chemical, thermal and mechanical properties. In this paper, we discussed an innovative and simple method to synthesize titanium dioxide （TiO2） nanoclusters, using graphene as a mid-step template not as a component of final product. Using this method, the graphene was firstly fully coated with TiO2 nanoparticles by the thermal decomposition of titanium （IV） isopropoxide in a supercritical carbon dioxide （SC-CO2） at 200 ℃; the developed TiO2/graphene composites then were heated in an oxygen atmosphere. Eventually the TiO2 nanoclusters were obtained. The prepared TiO2 nanoclusters showed irregular features with high surface coverage, providing promises in a wide range of applications, especially for photo-degradation of organic compounds in aqueous solution under the radiation of UV-light.

关键词： Titanium dioxide Graphene Supercritical CO2 Nanocluster

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Numerical simulation of the three-dimensional flow-path in a ram-rotor

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航空动力学报 2010年第6期25卷 1358-1365页

作者： HAN Ji-ang ZHONG Jing-jun YAN Hong-ming Marine Engineering College Dalian Maritime UniversityDalian 116026China School of Energy Science and Engineering Harbin institute of TechnologyHarbin 150001China

A kind of three-dimensional flow-path of the ram-rotor was designed in this paper according to the design method of the typical supersonic intake of aircraft and missiles,especially the design method of the compression ramp,the throat and the subsonic *** design Mach number of the flow-path was based on the averaged relative Mach number,regardless of the change of incoming Mach number along radial direction of the ***,the flowfield of the designed flow-path was simulated numerically with computational fluid dynamics software at design *** purpose of simulation was to obtain the details of the flowfield,including the structure of the shock wave system,position of flow separation zone,and so *** performance of the ram-rotor was also *** numerical results show the structure of the shock wave system in the flow-path is similar to that in the supersonic *** improve the overall performance of the ram-rotor,the reasonable compromise between the total pressure ratio and the isentropic adiabatic efficiency should be *** structure optimization of the flow-path and the configuration of the shock wave system have great influence on the performance of the ram-rotor.

关键词： ram-rotor flow-path supersonic intake numerical simulation design point

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Enhancing Retinal Vessel Segmentation Generalization via Layout-Aware Generative Modelling

arXiv

引用

arXiv 2025年

作者： Fhima, Jonathan Van Eijgen, Jan Beeckmans, Lennert Jacobs, Thomas Freiman, Moti Nakayama, Luis Filipe Stalmans, Ingeborg Baskin, Chaim Behar, Joachim A. Faculty of Biomedical Engineering Technion-IIT Israel Faculty of Mathematics Technion-IIT Israel Department of Neurosciences KU Leuven Belgium Department of Ophthalmology UZ Leuven Belgium Department of Electrical Engineering KU Leuven Belgium Ophthalmology Department São Paulo Federal University Brazil Medical Engineering and Science Massachusetts Institute of Technology United States School of Electrical and Computer Engineering Ben-Gurion University of the Negev Israel

Generalization in medical segmentation models is challenging due to limited annotated datasets and imaging variability. To address this, we propose Retinal Layout-Aware Diffusion (RLAD), a novel diffusion-based framework for generating controllable layout-aware images. RLAD conditions image generation on multiple key layout components extracted from real images, ensuring high structural fidelity while enabling diversity in other components. Applied to retinal fundus imaging, we augmented the training datasets by synthesizing paired retinal images and vessel segmentations conditioned on extracted blood vessels from real images, while varying other layout components such as lesions and the optic disc. Experiments demonstrated that RLAD-generated data improved generalization in retinal vessel segmentation by up to 8.1%. Furthermore, we present REYIA, a comprehensive dataset comprising 586 manually segmented retinal images. To foster reproducibility and drive innovation, both our code and dataset will be made publicly accessible (upon publication). © 2025, CC BY-NC-ND.

关键词： Ophthalmology

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