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Message passing method for social contagion in hypergraphs 认领 引用
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作者 Hui Leng Zhao-Yan Wu Rong Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期538-547,共10页
The emergence of hypergraphs has solved the problem that the interactions between nodes are insufficient to describe the complex relationships among multiple individuals.In this paper,we model social contagion with th... The emergence of hypergraphs has solved the problem that the interactions between nodes are insufficient to describe the complex relationships among multiple individuals.In this paper,we model social contagion with the reinforcement effect on hypergraphs,where hyperedges disseminate information to nodes,and nodes upload information to hyperedges.In order to reduce the complexity of high-order interactions on the propagation,hypergraphs are mapped to factor graphs,where hyperedges are encoded to factor nodes,and the connection between a node and a factor node indicates that the node is located in the hyperedge.Taking into account the heterogeneity of nodes and hyperedges,we establish the message passing evolution equations about each node based on the factor graph.Finally,we carry out numerical simulations by iterating the message passing equations.We find that the probability of the adopted state decreases before the outbreak of social contagion,and the final adopting scale suddenly increases as the transmission rates increase,which are caused by the combined action of high-order interactions and the social reinforcement effect.Significantly,the final adopting scale presents a step-like variation when the adopting threshold of hyperedges changes. 展开更多
关键词 social contagion hypergraph message passing method
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Passing the baton 认领 引用
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作者 Scott K.Powers 《Sports Medicine and Health Science》 CAS CSCD 2026年第1期1-2,共2页
Sports Medicine and Health Science(SMHS)has a short but impressive history.Following two diligent years of preplanning,SMHS was founded in 2019 by Co-Editors-in-Chief Dr.J.Larry Durstine and Dr.Quansheng Su.Dr.J.Larry... Sports Medicine and Health Science(SMHS)has a short but impressive history.Following two diligent years of preplanning,SMHS was founded in 2019 by Co-Editors-in-Chief Dr.J.Larry Durstine and Dr.Quansheng Su.Dr.J.Larry Durstine is retiring from his position on December 31,2025 and I am honored to accept the role of Editor-in-Chief(EIC)of SMHS along with Dr.Su.I want to begin my term as EIC by thanking Dr.J.Larry Durstine for his hard work and excellent editorial leadership during the first six years of journal operation.My job as the new EIC of SMHS will be to build on the already established excellence of the journal. 展开更多
关键词 health science journal operation sports medicine health science smhs sports medicine Passing Baton editorial leadership
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Learning-Based Turbo Message Passing for Channel Estimation in Rich-Scattering MIMO-OFDM 认领 引用 被引量：1
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作者 Huang Zhouyang Jiang Wenjun +2 位作者 Yuan Xiaojun Wang Li Zuo Yong 《China Communications》 SCIE EI CSCD 2025年第6期154-167,共14页
In this paper,we focus on the channel estimation for multi-user MIMO-OFDM systems in rich scattering environments.We find that channel sparsity in the delay-angle domain is severely compromised in rich scattering envi... In this paper,we focus on the channel estimation for multi-user MIMO-OFDM systems in rich scattering environments.We find that channel sparsity in the delay-angle domain is severely compromised in rich scattering environments,so that most existing compressed sensing(CS)based techniques can harvest a very limited gain(if any)in reducing the channel estimation overhead.To address the problem,we propose the learning-based turbo message passing(LTMP)algorithm.Instead of exploiting the channel sparsity,LTMP is able to efficiently extract the channel feature via deep learning as well as to exploit the channel continuity in the frequency domain via block-wise linear modelling.More specifically,as a component of LTMP,we develop a multi-scale parallel dilated convolutional neural network(MPDCNN),which leverages frequency-space channel correlation in different scales for channel denoising.We evaluate the LTMP’s performance in MIMO-OFDM channels using the 3rd generation partnership project(3GPP)clustered delay line(CDL)channel models.Simulation results show that the proposed channel estimation method has more than 5 dB power gain than the existing algorithms when the normalized mean-square error of the channel estimation is-20 dB.The proposed algorithm also exhibits strong robustness in various environments. 展开更多
关键词 channel estimation deep learning dilated CNN message passing MIMO-OFDM rich scattering environments
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Effect of Railway Spacing on Aerodynamic Performance of 600 km/h Maglev Trains Passing Each Other 认领 引用 被引量：1
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作者 Bailong Sun Tian Li +1 位作者 Deng Qin Yan Li 《Fluid Dynamics & Materials Processing》 EI 2025年第2期371-385,共15页
High-speed maglev trains(HSMTs)can run at high running speeds due to their unique design.The pressure waves that these trains generate while passing each other are therefore very intense,and can even have safety impli... High-speed maglev trains(HSMTs)can run at high running speeds due to their unique design.The pressure waves that these trains generate while passing each other are therefore very intense,and can even have safety implications.In order to reduce the transient impact of such waves,the standard k-ε turbulence model is used in this work to assess the effect of railway spacing on the aerodynamic loads,pressure and surrounding flow field of 600 km/h maglev trains passing each other in open air.The sliding mesh technique is used to determine the relative motion between the considered trains.The results show that the surface pressure is approximately linearly correlated with the square of the speed while the amplitude of the pressure wave on the train surface,side force,and rolling moment all have negative exponential relationships with the railway spacing. 展开更多
关键词 Railway spacing maglev train aerodynamic numerical simulation two trains passing each other
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Deeply mourn the passing of Prof.Mark Tso,the General Scientific Advisor of IJO/IES,our beloved mentor 认领 引用
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《International Journal of Ophthalmology(English edition)》 SCIE CAS 2025年第7期F0003-F0003,共1页
The former Vice-President of the International Council of Ophthalmology(ICO).Professor of Ophthalmology Emeritus Johns Hopkins University School of Medicine,Wilmer Eye Institute,USA.The first Director of the Departmen... The former Vice-President of the International Council of Ophthalmology(ICO).Professor of Ophthalmology Emeritus Johns Hopkins University School of Medicine,Wilmer Eye Institute,USA.The first Director of the Department of Ophthalmology and Visual Sciences,The Chinese University of Hong Kong China.The first Director of the Peking University Eye Center,China. 展开更多
关键词 professor general scientific advisor mentor ico ijo ies former vice president ophthalmology passing
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Field experiment of subgrade vibration induced by passing train in a seasonally frozen region of Daqing 认领 引用 被引量：18
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作者 Ling Xianzhang Zhang Feng +2 位作者 Zhu Zhanyuan Ding Lin Hu Qingli 《Earthquake Engineering and Engineering Vibration》 SCIE EI 2009年第1期149-157,共9页
The vibration characteristics and attenuation of the subgrade caused by passing trains in a seasonally frozen region of Daqing, China are investigated. Three field experiments were conducted during different times thr... The vibration characteristics and attenuation of the subgrade caused by passing trains in a seasonally frozen region of Daqing, China are investigated. Three field experiments were conducted during different times through the year, in normal, freezing and thawing periods, respectively, and the influence of the season, train speed and train type, is described in this paper. The results show that： （1） the vertical component is the greatest among the three components of the measured vibration near the rail track, and as the distance to the railway track increases, the dominant vibration depends on the season. （2） Compared with the vibration in the normal period, the vertical and longitudinal vibrations increase while the lateral vibration decreases in the freezing period. However, in the thawing period, the vertical and longitudinal vibrations decrease, and the lateral vibration increases. （3） As train speeds increase, the subgrade vibration increases. （4） The vibration induced by a freight train is greater than by a passenger train. These observations provide a better understanding of the vibration and dynamic stability of the subgrade and may be useful in developing criteria for railway and building construction in cold regions. 展开更多
关键词 subgrade vibration passing train characteristic acceleration seasonally frozen regions Daqing area of China
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Wind tunnel measurement of aerodynamic characteristics of trains passing each other on a simply supported box girder bridge 认领 引用 被引量：16
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作者 Xiaozhen Li Yiling Tan +2 位作者 Xiaowei Qiu Zhenhua Gong Ming Wang 《Railway Engineering Science》 EI 2021年第2期152-162,共11页
The aerodynamic performance of high-speed trains passing each other was investigated on a simply supported box girder bridge,with a span of 32 m,under crosswinds.The bridge and train models,modeled at a geometric scal... The aerodynamic performance of high-speed trains passing each other was investigated on a simply supported box girder bridge,with a span of 32 m,under crosswinds.The bridge and train models,modeled at a geometric scale ratio of 1:30,were used to test the aerodynamic forces of the train,with the help of a designed moving test rig in the XNJD-3 wind tunnel.The effects of wind speed,train speed,and yaw angle on the aerodynamic coefficients of the train were analyzed.The static and moving model tests were compared to demonstrate how the movement of the train influences its aerodynamic characteristics.The results show that the sheltering effect introduced by trains passing each other can cause a sudden change in force on the leeward train,which is further influenced by the wind and running speeds.Detailed analyses related to the effect of wind and train speeds on the aerodynamic coefficients were conducted.The relationship between the change in aerodynamic coefficients and yaw angle was finally described by a series of proposed fitting formulas. 展开更多
关键词 Aerodynamic coefficient Two trains passing each other Simply supported box girder bridge Wind tunnel
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Aerodynamic performances and vehicle dynamic response of high-speed trains passing each other 认领 引用 被引量：10
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作者 Yinghui ZHAO Jiye ZHANG +1 位作者 Tian LI Weihua ZHANG 《Journal of Modern Transportation》 2012年第1期36-43,共8页
Based on the aerodynamics and vehicle dynamics, the aerodynamic performances and vehicle dynamic characteristics of two high-speed trains passing each other on the ground, embankment and bridge are studied. Firstly, a... Based on the aerodynamics and vehicle dynamics, the aerodynamic performances and vehicle dynamic characteristics of two high-speed trains passing each other on the ground, embankment and bridge are studied. Firstly, a train aerodynamic model and a vehicle dynamic model are established. Through the simulation of the two models, the pressure waves, aerodynamic forces, and vehicle dynamic responses are obtained. Then, the pressure waves and aero- dynamic forces on different foundations are compared. The results show that the variation trends of pressure wave and aerodynamic forces of trains passing each other on different foundations are almost similar. The peak-to-peak differ- ences in pressure wave and aerodynamic force are below 4% and 3% in three cases in open air. Besides, the differences of security indexes, including coefficient of derailment, wheel unloading rate, the wheelset lateral force, and the wheel- rail vertical force, are below 2% among the three cases; the differences of comfort indexes, including the lateral acceleration and the vertical acceleration, are also below 2%. It is concluded that the dynamic performances of trains pass- ing each other are influenced little by different foundations in open air. 展开更多
关键词 trains passing each other foundations pressure wave aerodynamics vehicle dynamics
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基于RFieldbus的Token-Passing协议实时性能建模 认领 引用 被引量：4
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作者 侯维岩 费敏锐 +1 位作者 汪敏 陈伯时 《系统仿真学报》 EI CAS 北大核心 2005年第2期296-299,共4页
RFieldbus 无线现场总线的 MAC 协议 Token Passing 可看成是一个多台多队列排队系统。在分析了 TTR(令牌目的循环时间)对 RFieldbus 中 3 个优先级队列的服务时间的动态限制后,多台单队列排队模型 RF-P 被提出。对从站的轮巡交换数据... RFieldbus 无线现场总线的 MAC 协议 Token Passing 可看成是一个多台多队列排队系统。在分析了 TTR(令牌目的循环时间)对 RFieldbus 中 3 个优先级队列的服务时间的动态限制后,多台单队列排队模型 RF-P 被提出。对从站的轮巡交换数据任务被转化为RF-P 中的令牌内走步时间,原有的高、低级别两个队列则化成了两个具有不同 Poisson 到达率的 M/G/1/∞服务台。利用排队论中的准守恒 PCL 定律,在将服务时间限制转换为数量限制后,求出了等待响应时间的数学解析式。与试验结果的比较表明,在负载不大于 60%时其偏差度约在 10-20%间。 展开更多
关键词 Token Passing协议 多台单队列排队模型 实时性能 准守恒PCL定律
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Vector Approximate Message Passing with Sparse Bayesian Learning for Gaussian Mixture Prior 认领 引用 被引量：3
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作者 Chengyao Ruan Zaichen Zhang +3 位作者 Hao Jiang Jian Dang Liang Wu Hongming Zhang 《China Communications》 SCIE CSCD 2023年第5期57-69,共13页
Compressed sensing(CS)aims for seeking appropriate algorithms to recover a sparse vector from noisy linear observations.Currently,various Bayesian-based algorithms such as sparse Bayesian learning(SBL)and approximate ... Compressed sensing(CS)aims for seeking appropriate algorithms to recover a sparse vector from noisy linear observations.Currently,various Bayesian-based algorithms such as sparse Bayesian learning(SBL)and approximate message passing(AMP)based algorithms have been proposed.For SBL,it has accurate performance with robustness while its computational complexity is high due to matrix inversion.For AMP,its performance is guaranteed by the severe restriction of the measurement matrix,which limits its application in solving CS problem.To overcome the drawbacks of the above algorithms,in this paper,we present a low complexity algorithm for the single linear model that incorporates the vector AMP(VAMP)into the SBL structure with expectation maximization(EM).Specifically,we apply the variance auto-tuning into the VAMP to implement the E step in SBL,which decrease the iterations that require to converge compared with VAMP-EM algorithm when using a Gaussian mixture(GM)prior.Simulation results show that the proposed algorithm has better performance with high robustness under various cases of difficult measurement matrices. 展开更多
关键词 sparse Bayesian learning approximate message passing compressed sensing expectation propagation
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Relationship between number of passing events and operating parameters in mixed bicycle traffic 认领 引用 被引量：3
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作者 闫星臣 何鹏 +2 位作者 陈峻 叶晓飞 刘擎超 《Journal of Southeast University(English Edition)》 EI CAS 2015年第3期418-423,共6页
This paper investigates the passing events between electric bicycles and conventional bicycles and explores the relationships between passing events and traffic parameters in bicycle facilities.Three exclusive bicycle... This paper investigates the passing events between electric bicycles and conventional bicycles and explores the relationships between passing events and traffic parameters in bicycle facilities.Three exclusive bicycle paths in Nanjing, China,were observed with cameras.Then,the field data including vehicle number,velocity characteristics and passing event features were analyzed in detail.Data analysis and fitting reveal that the speed difference has little impact on the passing event number,as does the bicycle ratio.The Gaussian function can better describe the relationship between the passing event number and bicycle volume （density）.The valid use level of bicycle path width influences the inflexion of the passing events-density fitting curve.The conclusions can be applied for estimating the passing events in mixed bicycle flows and for choosing a suitable width of separate bicycle path. 展开更多
关键词 mixed bicycle traffic passing events traffic operating parameters correlation analysis
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Speech Enhancement Based on Approximate Message Passing 认领 引用 被引量：2
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作者 Chao Li Ting Jiang Sheng Wu 《China Communications》 SCIE CSCD 2020年第8期187-198,共12页
To overcome the limitations of conventional speech enhancement methods, such as inaccurate voice activity detector(VAD) and noise estimation, a novel speech enhancement algorithm based on the approximate message passi... To overcome the limitations of conventional speech enhancement methods, such as inaccurate voice activity detector(VAD) and noise estimation, a novel speech enhancement algorithm based on the approximate message passing(AMP) is adopted. AMP exploits the difference between speech and noise sparsity to remove or mute the noise from the corrupted speech. The AMP algorithm is adopted to reconstruct the clean speech efficiently for speech enhancement. More specifically, the prior probability distribution of speech sparsity coefficient is characterized by Gaussian-model, and the hyper-parameters of the prior model are excellently learned by expectation maximization(EM) algorithm. We utilize the k-nearest neighbor(k-NN) algorithm to learn the sparsity with the fact that the speech coefficients between adjacent frames are correlated. In addition, computational simulations are used to validate the proposed algorithm, which achieves better speech enhancement performance than other four baseline methods-Wiener filtering, subspace pursuit(SP), distributed sparsity adaptive matching pursuit(DSAMP), and expectation-maximization Gaussian-model approximate message passing(EM-GAMP) under different compression ratios and a wide range of signal to noise ratios(SNRs). 展开更多
关键词 speech enhancement approximate message passing Gaussian model expectation maximization algorithm
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Prediction of Hydrodynamic Forces on a Moored Ship Induced by a Passing Ship in Shallow Water Using a High-Order Panel Method 认领 引用 被引量：4
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作者 徐华福 邹早建 《Journal of Shanghai Jiaotong university(Science)》 EI 2016年第2期129-135,共7页
A three-dimensional high-order panel method based on non-uniform rational B-spline(NURBS) is developed for predicting the hydrodynamic interaction forces on a moored ship induced by a passing ship in shallow water. An... A three-dimensional high-order panel method based on non-uniform rational B-spline(NURBS) is developed for predicting the hydrodynamic interaction forces on a moored ship induced by a passing ship in shallow water. An NURBS surface is used to precisely represent the hull geometry. Velocity potential on the hull surface is described by B-spline after the source density distribution on the boundary surface is determined. A collocation approach is applied to the boundary integral equation discretization. Under the assumption of low passing speed, the effect of free surface elevation is neglected in the numerical calculation, and infinite image method is used to deal with the finite water depth effect. The time stepping method is used to solve the velocity potential at each time step. Detailed convergence study with respect to time step, panel size and Green function is undertaken. The present results of hydrodynamic forces are compared with those obtained by slender-body theory to show the validity of the proposed numerical method. Calculations are conducted for different water depths and lateral distances between ships, and the detail results are presented to demonstrate the effects of these factors. 展开更多
关键词 moored ship passing ship hydrodynamic interaction non-uniform rational B-spline(NURBS) high-order panel method
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Compact passing algorithm for signalized intersection management based on vehicular network 认领 引用 被引量：1
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作者 Bian Chentong Yin Guodong +1 位作者 Xu Liwei Zhang Ning 《Journal of Southeast University(English Edition)》 EI CAS 2019年第1期103-110,共8页
To improve the traffic efficiency at signalized intersections, a compact passing algorithm is proposed based on a vehicular network. Its basic principle is that several waiting vehicles after the stop line of the cons... To improve the traffic efficiency at signalized intersections, a compact passing algorithm is proposed based on a vehicular network. Its basic principle is that several waiting vehicles after the stop line of the considered intersection should simultaneously start in green periods. Thus, more vehicles can pass the intersection in a green period. Then, the having passed vehicles should follow the planned trajectories to enlarge their longitudinal clearances. Phase timing is not considered in the compact passing algorithm, and therefore, the proposed compact passing algorithm can be combined with other algorithms on phase timing to further improve their performances. Several simulations were designed and performed to verify the performance of the proposed algorithm. The simulation results show that the proposed algorithm can increase the number of completed vehicles and decrease the travel time in the signalized intersections managed by fixed-time and vehicle actuated algorithms, which indicates that the proposed algorithm is effective for improving the traffic efficiency at common signalized intersections. 展开更多
关键词 intersection management signalized intersection vehicular network compact passing phase timing
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MPI:大有希望的massage_passing标准 认领 引用 被引量：1
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作者 王继龙 唐朔飞 方滨兴 《计算机科学》 北大核心 1996年第4期31-34,共4页
message-passing是一个被广泛应用的并行计算模型,但至今,无论从语法或语义上message-Passing都还没有形成一个标准.并行计算机厂商在提供标准串行语言的同时,提供了各自不同的专有message一passing库,并行程序设计难免依赖于具体的系... message-passing是一个被广泛应用的并行计算模型,但至今,无论从语法或语义上message-Passing都还没有形成一个标准.并行计算机厂商在提供标准串行语言的同时,提供了各自不同的专有message一passing库,并行程序设计难免依赖于具体的系统和应用,这既限制了可移植性,也限制了听取用户对某些不易获得或对当前的应用不合适的系统的意见。没有一个标准,厂商们非常自然地把他们的专有库的优点视为有竟争力的优势,更加着力与众不同(因而不可移植)。为了应付可移植问题,研究团体已经开发了许多库来收集其它库之间的不同点. 展开更多
关键词 并行程序设计 MPI massage passing 标准
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Hybrid simulation of q=1 high-order harmonics driven by passing energetic particles in tokamak plasmas 认领 引用
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作者 刘胜 任珍珍 +3 位作者 汪卫华 申伟 杨锦宏 宁洪伟 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第12期31-39,共9页
High-order harmonics q(ψs)=1 energetic particle modes(EPMs)have been observed in toroidal plasmas experiments with neutral beam injection.To investigate these phenomena,linear properties and nonlinear dynamics of ... High-order harmonics q(ψs)=1 energetic particle modes(EPMs)have been observed in toroidal plasmas experiments with neutral beam injection.To investigate these phenomena,linear properties and nonlinear dynamics of these EPMs driven by passing energetic particles(EPs)are studied via the global hybrid kinetic-magnetohydrodynamic code M3D-K.Simulation results demonstrate that passing EPs'effects on high mode-number harmonics(q(ψs)=m=2/2,3/3,4/4)instability are more obvious than the q(ψs)=1/1 mode,especially when q-profile is sufficiently flat in the core region.Furthermore,the effects of the pitch angleΛ_0 and beam ion pressure Phot/Ptotalon the features of high n components are also analyzed specifically.It is found that there exists only one resonant condition for these EPMs.In the nonlinear phase,these high mode-number harmonics can induce significant energetic ions redistribution and chirping up phenomena,which differs from the classical fishbone excited by passing EPs.These discoveries are conducive to better apprehend the underlying physical mechanisms of the highorder harmonics driven by passing EPs. 展开更多
关键词 high-order harmonics passing energetic particles wave-particle resonance tokamak
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Numerical Prediction of Hydrodynamic Forces on A Berthed Ship Induced by A Passing Ship in Different Waterway Geometries 认领 引用
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作者 王宏志 邹早建 《China Ocean Engineering》 SCIE EI CSCD 2016年第2期205-216,共12页
An investigation has been conducted to quantify the effect of waterway geometry on the form and magnitude of forces and moment experienced by a berthed ship due to a passing ship.By using the dynamic mesh technique an... An investigation has been conducted to quantify the effect of waterway geometry on the form and magnitude of forces and moment experienced by a berthed ship due to a passing ship.By using the dynamic mesh technique and solving the unsteady RANS equations in conjunction with a RNG k？ε turbulence model,numerical simulation of the three-dimensional unsteady viscous flow around a passing ship and a berthed ship in different waterway geometries is conducted,and the hydrodynamic forces and moment acting on the berthed ship are calculated.The proposed method is verified by comparing the numerical results with existing empirical curves and a selection of results from model scale experiments.The calculated interaction forces and moment are presented for six different waterway geometries.The magnitude of the peak values and the form of the forces and moment on the berthed ship for different cases are investigated to assess the effect of the waterway geometry.The results of present study can provide certain guidance on safe maneuvering of a ship passing by a berthed ship. 展开更多
关键词 passing ship-berthed ship hydrodynamic interaction numerical simulation waterway geometry
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Turbo Message Passing Based Burst Interference Cancellation for Data Detection in Massive MIMO-OFDM Systems 认领 引用 被引量：3
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作者 Wenjun Jiang Zhihao Ou +1 位作者 Xiaojun Yuan Li Wang 《China Communications》 SCIE CSCD 2024年第2期143-154,共12页
This paper investigates the fundamental data detection problem with burst interference in massive multiple-input multiple-output orthogonal frequency division multiplexing(MIMO-OFDM) systems. In particular, burst inte... This paper investigates the fundamental data detection problem with burst interference in massive multiple-input multiple-output orthogonal frequency division multiplexing(MIMO-OFDM) systems. In particular, burst interference may occur only on data symbols but not on pilot symbols, which means that interference information cannot be premeasured. To cancel the burst interference, we first revisit the uplink multi-user system and develop a matrixform system model, where the covariance pattern and the low-rank property of the interference matrix is discussed. Then, we propose a turbo message passing based burst interference cancellation(TMP-BIC) algorithm to solve the data detection problem, where the constellation information of target data is fully exploited to refine its estimate. Furthermore, in the TMP-BIC algorithm, we design one module to cope with the interference matrix by exploiting its lowrank property. Numerical results demonstrate that the proposed algorithm can effectively mitigate the adverse effects of burst interference and approach the interference-free bound. 展开更多
关键词 burst interference cancellation data detection massive multiple-input multiple-output(MIMO) message passing orthogonal frequency division multiplexing(OFDM)
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Efficient Recovery of Structured Sparse Signals via Approximate Message Passing with Structured Spike and Slab Prior 认领 引用 被引量：2
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作者 Xiangming Meng Sheng Wu +2 位作者 Michael Riis ANDersen Jiang Zhu Zuyao Ni 《China Communications》 SCIE CSCD 2018年第6期1-17,共17页
Due to limited volume, weight and power consumption, micro-satellite has to reduce data transmission and storage capacity by image compression when performs earth observation missions. However, the quality of images m... Due to limited volume, weight and power consumption, micro-satellite has to reduce data transmission and storage capacity by image compression when performs earth observation missions. However, the quality of images may be unsatisfied. This paper considers the problem of recovering sparse signals by exploiting their unknown sparsity pattern. To model structured sparsity, the prior correlation of the support is encoded by imposing a transformed Gaussian process on the spike and slab probabilities. Then, an efficient approximate message-passing algorithm with structured spike and slab prior is derived for posterior inference, which, combined with a fast direct method, reduces the computational complexity significantly. Further, a unified scheme is developed to learn the hyperparameters using expectation maximization(EM) and Bethe free energy optimization. Simulation results on both synthetic and real data demonstrate the superiority of the proposed algorithm. 展开更多
关键词 compressed sensing structuredsparsity spike and slab prior approximate message passing expectation propagation
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Aerodynamic characteristics of moving vehicles of two trains passing each other on bridge under crosswinds 认领 引用 被引量：2
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作者 HU Hao XIANG Huo-yue +2 位作者 LIU Ke-hong ZHU Jin LI Yong-le 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第8期2558-2573,共16页
Two trains passing each other is controlling factor for the wind-vehicle-bridge systems.To test the aerodynamic characteristics of moving vehicles under crosswinds when two trains are passing each other,a wind tunnel ... Two trains passing each other is controlling factor for the wind-vehicle-bridge systems.To test the aerodynamic characteristics of moving vehicles under crosswinds when two trains are passing each other,a wind tunnel test device,which has two moving tracks,was developed.The rationality of the test result was discussed,the effects of intersection mode,yaw angle and lane spacing on the aerodynamic coefficients of the leeward train were analyzed,and the difference of aerodynamic coefficients between the head vehicle and the tail vehicle was discussed.The results show that the proposed test device has good repeatability.The intersection modes have a certain effect on the aerodynamic force of the leeward train when two trains are passing each other,and the results should be more reasonable during the two trains dynamic passing each other.With the decrease of yaw angle,the sudden change of train aerodynamic coefficients is more obvious.The decrease of lane spacing will increase the sudden change of leeward vehicles.In the process of two trains passing each other,the aerodynamic coefficients of the head vehicle and tail vehicle are significantly different,so the coupling vibration analysis of wind-vehicle-bridge system should be considered separately. 展开更多
关键词 two trains passing each other moving vehicle wind tunnel test aerodynamic characteristics crosswinds
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