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SUPPLEMENT AND IMPROVEMENT OF HOLLY-PREISSMANN SCHEME

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Journal of Hydrodynamics 2004年第4期16卷 468-473页

作者： XIEZuo-tao ZHANGXiao-feng TANGuang-ming StateKeyLaboratoryofWaterResourcesandHydropowerEngineeringScience WuhanUniversity430072China

Using the undetermined coefficient method, Holly-Preissmann scheme isimproved effectively. The scheme with the minus velocity is added, and a new conservative scheme isalso presented on the basis of original scheme. T... 详细信息

关键词： holly-preissmann scheme conservative convection equation numerical scheme undetermined coefficient method

Distributed Minimum-Energy Containment Control of Continuous-Time Multi-Agent Systems by Inverse Optimal Control

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1533-1535页

作者： Fei Yan Xiangbiao Liu tao feng School of Information Science and Technology Southwest Jiaotong UniversityChengdu 611756China National Engineering Laboratory of Integrated Transportation Big Data Application Technology Chengdu 611756China

Dear Editor,This letter focuses on the distributed optimal containment control of continuous-time multi-agent systems(CTMASs)with respect to the minimum-energy performance index over fixed *** achieve this,we firstly investigate the optimal containment control problem using the inverse optimal control method,where all states of followers asymptotically converge to the convex hull spanned by the leaders while some quadratic performance indexes get minimized.A sufficient condition for existence of the distributed optimal containment control protocol is *** introducing the parametric algebraic Riccati equation(PARE),it is strictly proved that the global performance index can be used to approximate the standard minimumenergy performance index as the parameters tends to *** consequence,the standard minimum-energy cooperative containment control can be solved by local steady state feedback protocols.

关键词： optimal infinity algebraic

Simple Minimum(K_4-e)-coverings of Complete Multipartite Graphs

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Acta Mathematica Sinica,English Series 2019年第5期35卷 632-648页

作者： Yu feng GAO Yan Xun CHANG tao feng Institute of Mathematics Beijing Jiaotong University College of Mathematics Tonghua Normal University

A decomposition of K_(n(g))∪Γ, the complete n-partite equipartite graph over gn vertices union a graph Γ(called the excess) that is a subgraph of K_(n(g)), into edge disjoint copies of a graph G is called a simple minimum group divisible covering of type g^n with G if Γ contains as few edges as possible. We examine all possible excesses for simple minimum group divisible(K_4-e)-*** and sufficient conditions are established for their existence.

关键词： Group divisible covering (K4-e)-covering excess graph

Corrosion behavior of laser-clad coatings fabricated on Ti6Al4V with different contents of TaC addition

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Rare Metals 2020年第4期39卷 436-447页

作者： Lie-feng Hu Jun Li Ying-Hao Lv Yang-feng tao School of Materials Engineering Shanghai University of Engineering ScienceShanghai 201620China

The coatings were produced on Ti6A14V by lasercladding the mixture of Ni-based alloy and different contents of TaC(0 wt%,5 wt%,10 wt%,20 wt%,30 wt%,40 wt%).The microstructure and corrosion behavior of the coatings were investigated in *** coating without TaC is composed of TiNi/Ti2Ni(matrix)and TiC/TiB/TiB2(reinforcement).Moreover,TaC is precipitated again and TiC/TiB/TiB2 solid solutions containing Ta are formed in the *** potential of the coatings(-0.639,-0.636,-0.547,-0.534,-0.471 and-0.348 V)increases,and passive current density(1×10-5.4,1×10-5.6,1×10-6.4,1×10-6.8,1×10-6.7 and 1×10-6.9 A·cm-2)*** passive films are more difficult to break down(breakdown potential of 0.003,0.080,0.204 and 0.605 V).When the content of TaC exceeds 20 wt%,no breakdown phenomenon is *** passive film on the surface of coating without TaC is mainly composed of TiO2,Al2O3,Cr2O3,CrO3,NiO,Ni2O3 and *** the addition of TaC,Ta2O5 is formed in the passive *** content of Ta2O5 presents an increasing trend with the increase in the content of *** addition of TaC has a positive effect on corrosion resistance of the coatings.

关键词： Laser cladding Coating Microstructural evolution Corrosion resistance

Global dynamics of deterministic and stochastic epidemic systems with nonmonotone incidence rate

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International Journal of Biomathematics 2018年第8期11卷 107-130页

作者： tao feng Zhipeng Qiu Nanjing University of Science and Technology Nanjing 210094 P. R. China

This paper is devoted to studying the dynamics of a susceptible-infective-latent-infective (SILI) epidemic model that is subject to the combined effects of environmental noise and intervention strategy. We extend the classical SILI epidemic model from a deterministic framework to a stochastic one. For the deterministic case, the global stability analysis of the solution is carried out in terms of the basic reproduction number. For the stochastic case, sufficient conditions for the extinction of diseases are obtained. Then, the existence of stationary distribution and asymptotic behavior of the solution are further studied to illustrate the cycling phenomena of recurrent diseases. Numerical simulations are conducted to verify these analytical results. It is shown that both stochastic noise and intervention strategy contribute to the control of diseases.

关键词： SILI epidemic model stochastic asymptotic stability stationary distribution extinction intervention strategy

Tropical cyclones and multiscale climate variability: The active western North Pacific typhoon season of 2018

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Science China Earth Sciences 2020年第1期63卷 1-11页

作者： Liang WU Hongjie ZHANG tao feng Yulian TANG Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China College of Oceanography Hohai UniversityNanjing 210098China

The 2018 typhoon season in the western North Pacific(WNP) was highly active, with 26 named tropical cyclones(TCs) from June to November, which exceeded the climatological mean(22) and was the second busiest season over the past twenty years. More TCs formed in the eastern region of the WNP and the northern region of the South China Sea(SCS). More TCs took the northeast quadrant in the WNP, recurving from northwestward to northward and causing heavy damages in China's Mainland(69.73 billion yuan) in 2018. Multiscale climate variability is conducive to an active season via an enhanced monsoon trough and a weakened subtropical high in the WNP. The large-scale backgrounds in 2018 showed a favorable environment for TCs established by a developing central Pacific(CP) El Ni?o and positive Pacific meridional mode(PMM)episode on interannual timescales. The tropical central Pacific(TCP) SST forcing exhibits primary control on TCs in the WNP and large-scale circulations, which are insensitive to the PMM. During CP El Ni?o years, anomalous convection associated with the TCP warming leads to significantly increased anomalous cyclonic circulation in the WNP because of a Gill-type Rossby wave response. As a result, the weakened subtropical high and enhanced monsoon trough shift eastward and northward, which favor TC genesis and development. Although such increased TC activity in 2018 might be slightly suppressed by interdecadal climate variability, it was mostly attributed to the favorable interannual background. In addition, high-frequency climate signals,such as intraseasonal oscillations(ISOs) and synoptic-scale disturbances(SSDs), interacted with the enhanced monsoon trough and strongly modulated regional TC genesis and development in 2018.

关键词： Tropical cyclone Multiscale climate variability Typhoon season of 2018 Western North Pacific

Inter-antenna and subblock shifting and inversion for peak-to-average power ratio reduction in MIMO-OFDM systems

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The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 41-45页

作者： WANG Yi tao Xiao-feng Key Laboratory of Universal Wireless Communications (Beijing University ofPosts and Telecommunications) Ministry of Education Wireless TechnologyInnovation Institute Beijing 100876 China

In this article, an inter-antenna inter-subblock shifting and inversion （IASSI） scheme is proposed to reduce the peak-to-average power ratio （PAPR） in multi-input multioutput orthogonal frequency division multiplexing （MIMO- OFDM） systems. It exploits multiple antennas and subblocks to provide additional degrees of freedom to benefit the system. To reduce the implementation complexity of the proposed scheme, two simple suboptimal schemes are further presented based on the minimum current maximum criterion; one adopts sequential search and the other employs random binary grouping. The simulation results exhibit the effectiveness of these proposed schemes.

关键词： peak-to-average power ratio inter-antenna and subblock shifting and inversion sequential search randombinary grouping multi-input multi-output orthogonal frequencydivision multiplexing

Allocation and Scheduling of Network Resource for Multiple Control Applications in SDN

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China Communications 2015年第6期12卷 85-95页

作者： feng tao BI Jun WANG Ke Institute for Network Sciences and Cyberspace Tsinghua University Department of Computer Science and Technology Tsinghua University Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University

The network resource allocation in SDN for control applications is becoming a key problem in the near future because of the conflict between the need of the flow-level flexibility control and the limited capacity of flow *** on the analysis of the difference of the definition of network resource between SDN and traditional IP network,the idea of the integrated allocation of link bandwidth and flow table for multiple control applications in SDN is proposed in this ***,a price-based joint allocation model of network resource in SDN is built by introducing the price for each of the resources,which can get the proportional fair allocation of link bandwidth and the minimum global delay at the same *** have also designed a popular flow scheduling policy based on the proportional fair allocation of link bandwidth in order to achieve the minimum global delay.A flow scheduling module has been implemented and evaluated in Floodlight,named virtual forwarding space(VFS).VFS can not only implement the fair allocation of link bandwidth and minimum delay flow scheduling in data plane but also accelerate packet forwarding by looking up control rules in control plane.

关键词： resource allocation SDN multi-ple applications

The asymptotic existence of frames with a pair of orthogonal frame resolutions

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Science China Mathematics 2019年第9期62卷 1839-1850页

作者： Changyuan Wang Yanxun Chang tao feng Department of Mathematics Beijing Jiaotong UniversityBeijing100044China School of Mathematics and Statistics Zaozhuang UniversityZaozhuang277160China

Motivated by the applications to generalized Howell designs and multiply constant-weight codes, we establish an asymptotic existence theorem for(k, λ)-frames of type g^n with a pair of orthogonal frame resolutions vi... 详细信息

关键词： frames orthogonal frame resolutions asymptotic existence generalized Howell designs multiply constant-weight codes