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Fixed-Time Three-Dimensional Formation Control for Underactuated Autonomous Underwater Vehicles via Event-Triggered Mechanism 认领 引用
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作者 DING Wen-jun ZHANG Guo-zong +4 位作者 HUANG Feng-tian-yi ZHANG Lei CHAI Ya-jun MAO Zhao-yong LI Bo 《China Ocean Engineering》 SCIE EI CSCD 2026年第3期590-603,共14页
This research presents a fixed-time three-dimensional formation control strategy for underactuated autonomous underwater vehicles(AUVs)utilizing an event-triggered mechanism.The study introduces virtual AUVs to transf... This research presents a fixed-time three-dimensional formation control strategy for underactuated autonomous underwater vehicles(AUVs)utilizing an event-triggered mechanism.The study introduces virtual AUVs to transform the formation control problem into a trajectory tracking challenge.A virtual velocity regulation law is developed for virtual AUVs,enabling follower AUVs to track the reference position through virtual AUVs without requiring the leader autonomous underwater vehicle’s velocity information.To manage system uncertainties,the research implements a fixed-time disturbance observer based on AUV dynamic models,providing accurate estimations of parameter uncertainties and external disturbances.Through the backstepping approach,an expected velocity regulation law is formulated for underactuated AUVs,ensuring position tracking error convergence within a fixed time.Additionally,a fixed-time dynamic controller is implemented to facilitate rapid achievement of expected velocity by the follower AUV,while the event-triggered mechanism reduces control input triggering frequency.The stability analysis,based on Lyapunov theory,demonstrates that the closed-loop system’s tracking error converges to a compact residual set within a fixed time.Comparative simulation results confirm the proposed algorithm’s enhanced performance. 展开更多
关键词 underactuated autonomous underwater vehicles fixed time formation control event triggered mechanism fixed time disturbance observer
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Periodic solutions and fixed-time synchronization of discontinuous time-varying delayed Cohen-Grossberg neural networks 认领 引用
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作者 ZHANG Yi-cheng KONG Fan-chao Rathinasamy Sakthivel 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2026年第1期140-160,共21页
In this paper,a class of discontinuous Cohen-Grossberg neural networks with timevarying delays is considered.Firstly,under the extended Filippov differential inclusions framework,the problem of periodic solutions of t... In this paper,a class of discontinuous Cohen-Grossberg neural networks with timevarying delays is considered.Firstly,under the extended Filippov differential inclusions framework,the problem of periodic solutions of the considered neural networks with more relaxed conditions imposed on the amplification functions is analyzed by using set-valued mapping and Kakutani's fixed point theorem,which has rarely been used to study such problem.Secondly,the fixed-time synchronization of the error system of the considered neural networks is also investigated by designing a novel control strategy,which can improve not only the previous ones with sign function greatly,but also can reduce the chattering phenomenon.Finally,two numerical examples are presented to further illustrate the validity of the obtained results. 展开更多
关键词 Cohen-Grossberg neural networks periodic solutions Kakutani's fixed point theorem differential inclusions theory fixed-time synchronization
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Fixed Points and Crossovers for the Hysteresis Scaling of Dynamic Mean-Field Models 认领 引用
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作者 Jiapeng Yang Fan Zhong 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期5-11,共7页
Phase transitions are divided into first-order and continuous ones in the current classification.While the latter shows striking phenomena of scaling and universality,the former is typically characterized by discontin... Phase transitions are divided into first-order and continuous ones in the current classification.While the latter shows striking phenomena of scaling and universality,the former is typically characterized by discontinuous jumps in extensive variables and pronounced hysteresis.Recent studies have demonstrated universal scaling behavior controlled by a cubic fixed point in first-order phase transitions.However,more recent investigations of hysteresis in a dynamic mean-field quartic model driven across its first-order phase transitions have revealed new scaling exponents for different driving rates.Here,we discover a new exponent for large driving rates arising surprisingly from critical phenomena and show that,depending on the magnitude of the driving rates and the absence or presence of noise,the same mean-field model remarkably exhibits several universality classes with definite universal scaling exponents governed by their corresponding fixed points,as revealed through a systematic scaling analysis based on renormalization group theory.The theories,the various crossovers between different fixed points,and the complete universal scaling of full curve collapse,are all verified by numerical results.This further confirms universal scaling in first-order phase transitions. 展开更多
关键词 pronounced hysteresisrecent first order phase transitions fixed points scaling exponents phase transitions discontinuous jumps extensive variables quartic model cubic fixed point
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Investigation on the rolling contact fatigue cracks initiation of subway fixed frogs based on transient dynamics 认领 引用
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作者 Zhaoguang Zheng Zhiguo Dong +3 位作者 Jiayi Hu Jingmang Xu Kai Wang Ping Wang 《Railway Engineering Science》 EI 2026年第2期275-293,共19页
The issue of fatigue damage to rails has become increasingly prominent with the rise in subway traffic and speed.The hazardous space of the turnout frog significantly intensifies the dynamic interaction between the ve... The issue of fatigue damage to rails has become increasingly prominent with the rise in subway traffic and speed.The hazardous space of the turnout frog significantly intensifies the dynamic interaction between the vehicle and the frog rail,leading to more pronounced fatigue damage in the turnout rail.This paper focuses on the No.9 turnout fixed frog commonly used in subway lines.A three-dimensional explicit transient rolling contact finite element model of the fixed frog is established.The dynamic response of wheel-rail rolling contact is analyzed under various speeds and vertical stiffness conditions.Rolling contact fatigue crack locations,angles,and initiation life were investigated.The research indicates that the 30 mm top width cross-section of the nose rail is most susceptible to fatigue cracks,which initiate on the rail surface.The angle between the crack initiation surface and the lateral direction is between 70°and 95°.Higher speeds result in shorter fatigue life,while the vertical stiffness of the fastener has less of an effect.The simulation results align with findings from field surveys.The established model and research conclusions can provide theoretical support for optimizing fixed frog structures and predicting fatigue life. 展开更多
关键词 Fixed frog Rolling contact fatigue Crack initiation Explicit finite element method Vehicle speed Fastener stiffness
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Fixed-Time Fault-Tolerant Control for Small UUV With Dual-Layer Evolving Performance Boundary Under Full-State Constraints 认领 引用
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作者 Hongtao Liang Huiping Li Junzhi Yu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第7期1767-1769,共3页
Dear Editor,This letter investigates the fixed-time fault-tolerant control(FTC)problem for small unmanned underwater vehicles(UUVs)subject to the full-state error constraints involving position-layer and velocitylayer... Dear Editor,This letter investigates the fixed-time fault-tolerant control(FTC)problem for small unmanned underwater vehicles(UUVs)subject to the full-state error constraints involving position-layer and velocitylayer.First,a dual-level evolving performance boundary is devised by integrating the fixed-time performance functions and low-complexity error transformation techniques.This novel formulation converts the full-state constrained control issue into a dual-layer unconstrained stabilization,thus ensuring fixed-time convergence regardless of initial conditions. 展开更多
关键词 fixed time fault tolerant control velocity layer full state constraints small unmanned underwater vehicles small unmanned underwater vehicles uuvs subject dual layer evolving performance boundary position layer
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A modular simulation tool for fixed block and moving block railway signalling systems 认领 引用
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作者 M.Barbaro I.La Paglia +4 位作者 L.Bernardini G.Bucca R.Corradi M.Bocciolone A.Collina 《Railway Engineering Science》 EI 2026年第2期257-274,共18页
The railway signalling system is a key player in controlling train traffic,with the purpose of guaranteeing safety while respecting transport demand.For rail vehicles,visual-based driving is unfeasible,and thus,railwa... The railway signalling system is a key player in controlling train traffic,with the purpose of guaranteeing safety while respecting transport demand.For rail vehicles,visual-based driving is unfeasible,and thus,railway signalling systems have been developed as answers to this issue.Moreover,the increasing demand for railway traffic requires improved signalling system performances.Recent developments have led to the theoretical definition of the Moving Block signalling system as an approach to overcome the limitations of the Fixed Block system,currently adopted in many applications worldwide.This paper focuses on the development of a modular time-based simulation tool for Fixed Block and Moving Block railway signalling systems.The simulator incorporates all main elements for the assessment of signalling system’s performances,including the model of the Radio Block Centre,used for the communication among the trains,the On-Board Unit,which generates the reference speed profile,the vehicle longitudinal dynamics,and the speed control algorithm,emulating a human driver’s behaviour.Different operational conditions have been considered to show the capabilities of the simulator,which may represent a first step towards the reduction of on-site testing of railway signalling systems. 展开更多
关键词 Railway signalling system Fixed block Moving block Railway system simulation Railway vehicle dynamics Driver behavioural model
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Fixed-Time Hierarchical Game-Based Unmanned Aerial-Ground Vehicle Docking Control 认领 引用
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作者 Junkai Tan Shuangsi Xue +2 位作者 Zihang Guo Hui Cao Badong Chen 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第5期1242-1244,共3页
Dear Editor,This letter presents a novel fixed-time Stackelberg game-based adaptive dynamic programming(FxT-SG-ADP)control scheme for UAV-UGV docking control.The docking problem is formulated as a Stackelberg game,whe... Dear Editor,This letter presents a novel fixed-time Stackelberg game-based adaptive dynamic programming(FxT-SG-ADP)control scheme for UAV-UGV docking control.The docking problem is formulated as a Stackelberg game,where the UGV acts as a leader navigating 2-dimensional space while being tracked by a UAV required to dock with it.The docking performance is optimized by pursuing Stackelberg equilibrium of the Stackelberg game. 展开更多
关键词 adaptive dynamic programming pursuing stackelberg equilibrium fixed time stackelberg equilibrium docking problem stackelberg gamewhere UAV UGV docking control stackelberg game
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Distributed Gain Scheduling Dynamic Event-Triggered Semi-Global Leader-Following Consensus of Input Constrained MASs Under Fixed/Switching Topologies 认领 引用
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作者 Meilin Li Tieshan Li Hongjing Liang 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第4期888-902,共15页
In this paper,the semi-global leader-following consensus issue of multi-agent systems with constrained input under fixed and switching topologies is investigated via a distributed gain scheduling dynamic event-trigger... In this paper,the semi-global leader-following consensus issue of multi-agent systems with constrained input under fixed and switching topologies is investigated via a distributed gain scheduling dynamic event-triggered method.First,a novel distributed gain scheduling consensus protocol is proposed under fixed topology,which integrates time-varying gain and distributed parameter schedulers.This approach enhances the transient performance of consensus tracking by enlarging the gain parameter through the scheduler,while the reliance of the scheduler on global state information is eliminated via a distributed design method.Subsequently,a distributed dynamic event-triggered mechanism is introduced to reduce the controller updates,while the expression of the inter-event times mitigates its explicit reliance on the system matrix.Additionally,to eliminate the need for real-time monitoring of neighboring agents'states and continuous communication,a distributed dynamic self-triggered mechanism is developed.Next,our approaches are extended to solve the semi-global leader-following consensus problem under switching topologies.The average dwell time technique is employed to alleviate the limitations on the switching rate among multiple topologies.Finally,the theoretical analysis is validated through simulation results. 展开更多
关键词 Dynamic event-triggered/self triggered mechanism fixed/switching topologies gain scheduling control input constraints multi-agent systems
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“H”形缝合与Fast-fix缝合治疗内侧半月板Ⅳ型Ramp损伤的效果对比 认领 引用
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作者 宋洋 梁国骏 +3 位作者 黄浩 黄济惠 林奕 蒋欢 《创伤与急危重病医学》 2026年第5期278-282,共5页
目的比较“H”形缝合与Fast-fix缝合治疗内侧半月板Ⅳ型Ramp损伤的临床效果。方法选取2021年7月至2023年12月在南方医科大学第八附属医院接受手术治疗的60例内侧半月板Ⅳ型Ramp损伤患者,男性35例,女性25例,年龄(38.9±8.1)岁,年龄... 目的比较“H”形缝合与Fast-fix缝合治疗内侧半月板Ⅳ型Ramp损伤的临床效果。方法选取2021年7月至2023年12月在南方医科大学第八附属医院接受手术治疗的60例内侧半月板Ⅳ型Ramp损伤患者,男性35例,女性25例,年龄(38.9±8.1)岁,年龄范围为21~56岁。根据手术缝合方式不同,将患者分为H组和F组,每组30例。H组采用关节镜下“H”形缝合技术治疗,F组采用关节镜下Fast-fix缝合技术治疗。比较两组围术期相关指标(手术时间、术中缝针数量、术后下地行走时间、切口愈合情况、住院时间、住院总费用)、术前及术后6、12个月膝关节功能[Lysholm评分、国际膝关节文献委员会(IKDC)评分]、术后12个月MRI半月板愈合情况、随访情况(完全负重活动时间、间隙压痛、麦氏征)以及术后并发症发生情况。结果H组手术时间短于F组,术中缝针数量及住院总费用少于F组,差异有统计学意义(P0.05)。结论关节镜下“H”形缝合与Fast-fix缝合治疗内侧半月板Ⅳ型Ramp损伤均具有较好的效果,可有效改善患者膝关节功能,而“H”形缝合在缩短手术时间、减少缝针数和住院总费用上优于Fast-fix缝合。 展开更多
关键词 半月板损伤 Ramp损伤 H形缝合 Fast-fix缝合 膝关节
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Fixed Points and Periodic Points in XOR-OR Parallel Hybrid Dynamical Systems over Complete Bipartite Graphs 认领 引用
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作者 XUE Yating ZHENG Jie LI Qike 《吉首大学学报（自然科学版）》 CAS 2026年第2期24-33,共10页
This paper investigates the dynamical evolution of parallel hybrid dynamical systems on complete bipartite graphs,where the local functions for the two vertex sets are configured as the Boolean XOR and OR functions,re... This paper investigates the dynamical evolution of parallel hybrid dynamical systems on complete bipartite graphs,where the local functions for the two vertex sets are configured as the Boolean XOR and OR functions,respectively.Through mathematical deduction and computer simulation,the results show that when the number of OR-vertices is odd,the system exhibits both fixed points and period-2 points.Conversely,when the number of OR-vertices is even,only fixed points exist.Furthermore,the necessary and sufficient conditions for the existence of these states,along with their specific counting formulas,are derived. 展开更多
关键词 parallel hybrid dynamical system complete bipartite graph fixed point periodic point
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基于CO2Fix的广西不同林龄人工桉树林碳汇研究 认领 引用
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作者 邵宇航 《区域治理》 2026年第16期0277-0279,共3页
为系统评估广西人工桉树林碳汇潜力,本研究基于第九次全国森林资源清查数据,按5个林龄组划分,采用生物量转换因子法与CO₂FIX模型,模拟2019—2060年桉树林碳储量及碳汇量变化。结果显示,各龄组总碳储量均随林龄单调递增,近熟林碳积累速... 为系统评估广西人工桉树林碳汇潜力,本研究基于第九次全国森林资源清查数据,按5个林龄组划分,采用生物量转换因子法与CO₂FIX模型,模拟2019—2060年桉树林碳储量及碳汇量变化。结果显示,各龄组总碳储量均随林龄单调递增,近熟林碳积累速率最快(11.05吨碳/(公顷・年)),过熟林固碳能力最强(周期末净碳通量-372.58吨碳/公顷)。全生长周期内,桉树林均为稳定大气碳汇,固碳能力持续提升。本研究为广西人工林碳汇经营、轮伐期优化及“双碳”政策制定提供了科学依据。 展开更多
关键词 桉树 人工林 碳储量 碳汇 CO?FIX 模型
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关节镜下Inside-Out与Fast-Fix缝合治疗内侧半月板Ramp损伤疗效对比 认领 引用
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作者 马洛毅 杨梦 祝静 《中国烧伤创疡杂志》 2026年第2期134-137,共4页
目的对比分析关节镜下Inside-Out与Fast-Fix两种缝合方式治疗内侧半月板Ramp损伤的效果。方法选取2022年1月至2024年1月河南科技大学第一附属医院收治的86例内侧半月板Ramp损伤患者作为研究对象,按照随机数表法分为Inside-Out组(43例)和... 目的对比分析关节镜下Inside-Out与Fast-Fix两种缝合方式治疗内侧半月板Ramp损伤的效果。方法选取2022年1月至2024年1月河南科技大学第一附属医院收治的86例内侧半月板Ramp损伤患者作为研究对象,按照随机数表法分为Inside-Out组(43例)和Fast-Fix组(43例),Inside-Out组患者采用关节镜下Inside-Out缝合,Fast-Fix组患者采用关节镜下Fast-Fix缝合,对比观察两组患者围手术期指标、半月板损伤部位愈合情况、国际膝关节文献委员会膝关节评估表(IKDC)评分、Lysholm评分以及不良事件发生情况。结果Inside-Out组患者术中出血量多于Fast-Fix组,手术时间与住院时间均长于Fast-Fix组(t=5.872、5.572、3.498,P均<0.001);术后6个月,Inside-Out组患者半月板损伤部位愈合情况与Fast-Fix组无明显差异(Z=-0.753,P=0.451);术后3、6个月,Inside-Out组患者IKDC评分及Lysholm评分均高于Fast-Fix组(IKDC评分:t=3.977、3.429,P均<0.001;Lysholm评分:t=3.474、3.467,P均<0.001);Inside-Out组患者不良事件总发生率与Fast-Fix组无明显差异(χ2=0.727,P=0.394)。结论关节镜下Inside-Out和Fast-Fix缝合均能有效修复内侧半月板Ramp损伤,但Inside-Out缝合虽术中出血量较多、手术时间与住院时间较长,却更有利于膝关节功能恢复。 展开更多
关键词 关节镜 Inside-Out缝合 Fast-Fix缝合 半月板Ramp损伤 半月板 膝关节功能
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A round-trip journey of electrons:Electron catalyzed direct fixation of N2to azos 认领 引用 被引量：2
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作者 Baijing Wu Jinrui Li +5 位作者 Xiaoxue Luo Jingtian Ni Yiting Lu Minhua Shao Cunpu Li Zidong Wei 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第1期386-393,共8页
The triple bond in N2has an extremely high bond energy and is thus difficult to break.N2is commonly converted into NH3 artificially via the Haber-Bosch process,and NH3can be utilized to produce other nitrogen... The triple bond in N2has an extremely high bond energy and is thus difficult to break.N2is commonly converted into NH3 artificially via the Haber-Bosch process,and NH3can be utilized to produce other nitrogen-containing chemicals.Here,we developed an electron catalyzed method to directly fix N2into azos,by pushing and pulling the electron into and from the aromatic halide with the cyclic voltammetry method.The round-trip journey of electron can successfully weaken the triple bond in N2through the electron pushing-induced aryl radical via a“brick trowel”transition state,and then produce the diazonium ions by pulling the electron out from the diazo radical intermediate.Different azos can be synthesized with this developed electron catalyzed approach.This approach provides a novel concept and practical route for the fixation of N2at atmospheric pressure into chemical products valuable for industrial and commercial applications. 展开更多
关键词 Fixed N2 AZo Electron catalyzed strategy "Brick trowel"transition state Arylradicals
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MEMS microwave power detection chip based on fixed beams and its model 认领 引用 被引量：2
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作者 Qirui Xu Zhiyin Ding Debo Wang 《Journal of Semiconductors》 EI CAS CSCD 2025年第6期87-95,共9页
In order to solve the problems of low overload power in MEMS cantilever beams and low sensitivity in traditional MEMS fixed beams,a novel MEMS microwave power detection chip based on the dual-guided fixed beam is desi... In order to solve the problems of low overload power in MEMS cantilever beams and low sensitivity in traditional MEMS fixed beams,a novel MEMS microwave power detection chip based on the dual-guided fixed beam is designed.A gap between guiding beams and measuring electrodes is designed to accelerate the release of the sacrificial layer,effectively enhanc-ing chip performance.A load sensing model for the MEMS fixed beam microwave power detection chip is proposed,and the mechanical characteristics are analyzed based on the uniform load applied.The overload power and sensitivity are investi-gated using the load sensing model,and experimental results are compared with theoretical results.The detection chip exhibits excellent microwave characteristic in the 9-11 GHz frequency band,with a return loss less than-10 dB.At a signal fre-quency of 10 GHz,the theoretical sensitivity is 13.8 fF/W,closely matching the measured value of 14.3 fF/W,with a relative error of only 3.5%.These results demonstrate that the proposed load sensing model provides significant theoretical support for the design and performance optimization of MEMS microwave power detection chips. 展开更多
关键词 detection chip dual-guided fixed beam MEMS load sensing model sensitivity
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Fractional Discrete-Time Analysis of an Emotional Model Built on a Chaotic Map through the Set of Equilibrium and Fixed Points 认领 引用 被引量：1
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作者 Shaher Momani Rabha W.Ibrahim Yeliz Karaca 《Computer Modeling in Engineering & Sciences》 SCIE EI 2025年第4期809-826,共18页
Fractional discrete systems can enable the modeling and control of the complicated processes more adaptable through the concept of versatility by providing systemdynamics’descriptions withmore degrees of freedom.Nume... Fractional discrete systems can enable the modeling and control of the complicated processes more adaptable through the concept of versatility by providing systemdynamics’descriptions withmore degrees of freedom.Numerical approaches have become necessary and sufficient to be addressed and employed for benefiting from the adaptability of such systems for varied applications.A variety of fractional Layla and Majnun model(LMM)system kinds has been proposed in the current work where some of these systems’key behaviors are addressed.In addition,the necessary and sufficient conditions for the stability and asymptotic stability of the fractional dynamic systems are investigated,as a result of which,the necessary requirements of the LMM to achieve constant and asymptotically steady zero resolutions are provided.As a special case,when Layla and Majnun have equal feelings,we propose an analysis of the system in view of its equilibrium and fixed point sets.Considering that the system has marginal stability if its eigenvalues have both negative and zero real portions,it is demonstrated that the system neither converges nor diverges to a steady trajectory or equilibrium point.It,rather,continues to hover along the line separating stability and instability based on the fractional LMM system. 展开更多
关键词 Fractional difference system fractional differential operators fractional calculus chaotic map equilibrium fixed point sets nyquist plot routh-Hurwitz criterion
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Investigation of flight stability for fixed canard dual-spin projectile via CFD/RBD coupled method 认领 引用
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作者 Gang Wang Tengyue Zhang +2 位作者 Tianyu Lin Haizhen Lin Ke Xi 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2025年第11期1-18,共18页
In this paper,a high-fidelity computational fluid dynamics(CFD)and rigid body dynamics(RBD)coupled platform for virtual flight simulation is developed to investigate the flight stability of fixed canard dual-spin proj... In this paper,a high-fidelity computational fluid dynamics(CFD)and rigid body dynamics(RBD)coupled platform for virtual flight simulation is developed to investigate the flight stability of fixed canard dual-spin projectile.The platform's reliability is validated by reproducing the characteristic resonance instability of such projectiles.By coupling the solution of the Unsteady Reynolds-Averaged Navier-Stokes equations and the seven-degree-of-freedom RBD equations,the virtual flight simulations of fixed canard dual-spin projectiles at various curvature trajectories are achieved,and the dynamic mechanism of the trajectory following process is analyzed.The instability mechanism of the dynamic instability during trajectory following process of the fixed canard dual-spin projectile is elucidated by simulating the rolling/coning coupled forced motion,and subsequently validated through virtual flight simulations.The findings suggest that an appropriate yaw moment can drive the projectile axis to precession in the tangential direction of the trajectory,thereby enhancing the trajectory following stability.However,the damping of the projectile attains its minimum value when the forward body equilibrium rotational speed(-128 rad/s)is equal to the negative of the fast mode frequency of the projectile.Insufficient damping leads to the fixed canard dual-spin projectile exiting the dynamic stability domain during the trajectory following,resulting in weakly damped instability.Keeping the forward body not rotating or increasing the spin rates to-192 rad/s can enhance the projectile's damping,thereby improving its dynamic stability. 展开更多
关键词 Fixed canard dual-spin projectile CFD/RBD coupled method Virtualflight simulation Following stability Dynamic stability
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Fixed Neural Network Image Steganography Based on Secure Diffusion Models 认领 引用
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作者 Yixin Tang Minqing Zhang +2 位作者 Peizheng Lai Ya Yue Fuqiang Di 《Computers, Materials & Continua》 SCIE EI 2025年第9期5733-5750,共18页
Traditional steganography conceals information by modifying cover data,but steganalysis tools easily detect such alterations.While deep learning-based steganography often involves high training costs and complex deplo... Traditional steganography conceals information by modifying cover data,but steganalysis tools easily detect such alterations.While deep learning-based steganography often involves high training costs and complex deployment.Diffusion model-based methods face security vulnerabilities,particularly due to potential information leakage during generation.We propose a fixed neural network image steganography framework based on secure diffu-sion models to address these challenges.Unlike conventional approaches,our method minimizes cover modifications through neural network optimization,achieving superior steganographic performance in human visual perception and computer vision analyses.The cover images are generated in an anime style using state-of-the-art diffusion models,ensuring the transmitted images appear more natural.This study introduces fixed neural network technology that allows senders to transmit only minimal critical information alongside stego-images.Recipients can accurately reconstruct secret images using this compact data,significantly reducing transmission overhead compared to conventional deep steganography.Furthermore,our framework innovatively integrates ElGamal,a cryptographic algorithm,to protect critical information during transmission,enhancing overall system security and ensuring end-to-end information protection.This dual optimization of payload reduction and cryptographic reinforcement establishes a new paradigm for secure and efficient image steganography. 展开更多
关键词 Image steganography fixed neural network secure diffusion models ElGamal
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Fixed-Time Stability of Random Nonlinear Systems 认领 引用
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作者 Fuyong Wang Jiayi Gong +1 位作者 Zhongxin Liu Fei Chen 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第7期1507-1509,共3页
Dear Editor,This letter embarks on an examination of fixed-time stability(FxTS)for random nonlinear systems(RNSs)governed by random differential equations.This endeavor encompasses a multifaceted analysis of FxTS,comm... Dear Editor,This letter embarks on an examination of fixed-time stability(FxTS)for random nonlinear systems(RNSs)governed by random differential equations.This endeavor encompasses a multifaceted analysis of FxTS,commencing with its rigorous definition and its integration with Lyapunov theory,along which a consequential corollary emerges.Particularly,the positive definiteness of the expectation of settling time is established,and a less conservative upper bound is derived.The effectiveness of the proposed fixed-time theorem is verified by an example. 展开更多
关键词 settling time integration lyapunov theoryalong Lyapunov theory random nonlinear systems rnss governed upper bound random differential equations fixed time stability random nonlinear systems
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The(Homotopy)Fixed Point Set of S1-Actions on Rationally Elliptic 4-Manifolds 认领 引用
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作者 Chen Huimin Liu Xiugui 《南开大学学报（自然科学版）》 CAS CSCD 北大核心 2025年第3期32-37,共6页
Let X be a closed simply connected rationally elliptic 4-manifold.The rational homotopy type of homotopy fixed point sets XhS^(1)is determined,and based on some relations between XhS^(1)and XS^(1),the rationa... Let X be a closed simply connected rationally elliptic 4-manifold.The rational homotopy type of homotopy fixed point sets XhS^(1)is determined,and based on some relations between XhS^(1)and XS^(1),the rational homotopy type of the fixed point set XS^(1)is determined. 展开更多
关键词 rationally elliptic 4-manifolds rational homotopy type homotopy fixed point set fixed point set
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Relativistic non-Fermi liquid fixed point in(2+1)-dimensional birefringent Dirac fermions interacting with electromagnetic fields 认领 引用
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作者 Wan-Zi Sun Kai Liu +1 位作者 Wu-Ming Liu Cheng-Xi Li 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第5期524-532,共9页
The system consisting of(2+1)-dimensional quasirelativistic birefringent Dirac fermions with Coulomb interactions and retarded current–current interactions is described by a quantum field theory similar to reduced qu... The system consisting of(2+1)-dimensional quasirelativistic birefringent Dirac fermions with Coulomb interactions and retarded current–current interactions is described by a quantum field theory similar to reduced quantum electrodynamics.We used the perturbative renormalization group method to study the low-energy behavior of the system and found that it flows to a fixed point of the non-Fermi liquid composed of relativistic pseudospin-1/2 Dirac fermions in the deep infrared limit.At the fixed point,the fermion Green function exhibits a finite anomalous dimension,and the residue of the quasiparticle pole vanishes in a power-law fashion.Our research provides new theoretical perspectives for understanding the origin of spin-1/2 fermions in the standard model. 展开更多
关键词 non-Fermi liquid fixed point birefringent Dirac fermions perturbative renormalization group Fermi velocity renormalization
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