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A measurement-driven adaptive probability hypothesis density filter for multitarget tracking

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Chinese Journal of Aeronautics 2015年第6期28卷 1689-1698页

作者： Si Weijian wang Liwei qu Zhiyu College of Information and Communication Engineering Harbin Engineering University

This paper studies the dynamic estimation problem for multitarget tracking. A novel gat- ing strategy that is based on the measurement likelihood of the target state space is proposed to improve the overall effectiveness of the probability hypothesis density （PHD） filter. Firstly, a measurement-driven mechanism based on this gating technique is designed to classify the measure- ments. In this mechanism, only the measurements for the existing targets are considered in the update step of the existing targets while the measurements of newborn targets are used for exploring newborn targets. Secondly, the gating strategy enables the development of a heuristic state estima- tion algorithm when sequential Monte Carlo （SMC） implementation of the PHD filter is investi- gated, where the measurements are used to drive the particle clustering within the space gate. The resulting PHD filter can achieve a more robust and accurate estimation of the existing targets by reducing the interference from clutter. Moreover, the target birth intensity can be adaptive to detect newborn targets, which is in accordance with the birth measurements. Simulation results demonstrate the computational efficiency and tracking performance of the proposed algorithm.

关键词： Adaptive Measurement-driven Multitarget trackin Probability hypothesis density Sequential Monte Carlo

Novel passive localization algorithm based on double side matrix-restricted total least squares

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Chinese Journal of Aeronautics 2013年第4期26卷 1008-1016页

作者： Xu Zheng qu Changwen wang Changhai Science and Technology on Avionics Integration Laboratory Department of Electronic and Information Engineering Naval Aeronautical and Astronautical University

In order to solve the bearings-only passive localization problem in the presence of erroneous observer position, a novel algorithm based on double side matrix-restricted total least squares （DSMRTLS） is proposed. First, the aforementioned passive localization problem is transferred to the DSMRTLS problem by deriving a multiplicative structure for both the observation matrix and the observation vector. Second, the corresponding optimization problem of the DSMRTLS problem without constraint is derived, which can be approximated as the generalized Rayleigh quotient minimization problem. Then, the localization solution which is globally optimal and asymptotically unbiased can be got by generalized eigenvalue decomposition. Simulation results verify the rationality of the approximation and the good performance of the proposed algorithm compared with several typical algorithms.

关键词： Bearings Erroneous observer position Generalized eigenvalue decomposition Matrix-restricted total least squares Passive localization

Neutron matter properties from relativistic Brueckner-Hartree-Fock theory in the full Dirac space

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 67-74页

作者： Xiaoying qu Hui Tong Chencan wang Sibo wang School of Mechatronics Engineering Guizhou Minzu UniversityGuiyang 550025China College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China Strangeness Nuclear Physics Laboratory RIKEN Nishina CenterWako 351-0198Japan School of Physics and Astronomy Sun Yat-Sen UniversityZhuhai 519082China Department of Physics Chongqing UniversityChongqing 401331China

A novel description of the strongly interacting pure neutron matter(PNM)was carried out by the relativistic Brueckner-HartreeFock(RBHF)theory in the full Dirac space with Bonn A *** scalar and vector components of the single-particle potentials are shown as functions of the momentum and the density,and are compared with the results obtained by the RBHF calculations in the Dirac space without negative-energy *** benchmarking the binding energies of PNM to those predicted by several ab initio methods in the nonrelativistic framework with two-and three-body forces,we find our results are softer than those from the Brueckner-Hartree-Fock theory with the inclusion of three-body force,and in harmony with the ones obtained by the Monte Carlo method and many-body perturbation theory within *** addition,the equation of state for neutron star matter is consistent with the constraints from multi-messenger astrophysical observation and heavy-ion collision *** tidal deformabilities of a binary neutron star system are calculated and found consistent with the constraints from GW170817.

关键词： neutron matter properties relativistic Brueckner-Hartree-Fock full Dirac space

Segmented Real-time Dispatch Model and Stochastic Robust Optimization for Power-gas Integrated Systems with Wind Power Uncertainty

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Journal of Modern Power Systems and Clean Energy 2023年第5期11卷 1480-1493页

作者： Ying wang Kaiping qu Kaifeng Zhang Key Laboratory of Measurement and Control of CSE Ministry of EducationSchool of AutomationSoutheast UniversityNanjingChina School of Electrical Engineering China University of Mining and TechnologyXuzhouChina

This paper develops a segmented real-time dispatch model for power-gas integrated systems(PGISs), where power-to-gas(P2G) devices and traditional automatic generation control units are cooperated to manage wind power uncertainty. To improve the economics of the real-time dispatch in regard to the current high operation cost of P2Gs, the wind power uncertainty set is divided into several segments, and a segmented linear decision rule is developed, which assigns adjustment tasks differently when wind power uncertainty falls into different segments. Thus, the P2G operation with high costs can be reduced in real-time adjustment. Besides, a novel segmented stochastic robust optimization is proposed to improve the efficiency and robustness of PGIS dispatch under wind power uncertainty, which minimizes the expected cost under the empirical wind power distribution and builds up the security constraints based on the robust optimization. The expected cost is formulated using a Nataf conversion-based multi-point estimate method, and the optimal number of estimate points is determined through sensitivity analysis. Furthermore, a difference-ofconvex optimization with a partial relaxation rule is developed to solve the non-convex dispatch problem in a sequential optimization framework. Numerical simulations in two testing cases validate the effectiveness of the proposed model and solving method.

关键词： Power-gas integrated system robust optimization real-time dispatch multi-point estimate method differenceof-convex optimization

Novel passive localization algorithm based on weighted restricted total least square

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Journal of Systems Engineering and Electronics 2013年第4期24卷 592-599页

作者： Changwen qu Zheng Xu Changhai wang Department of Electronic and Information Engineering Naval Aeronautical and Astronautical University Science and Technology on Avionics Integration Laboratory

A novel multi-observer passive localization algorithm based on the weighted restricted total least square （WRTLS） is proposed to solve the bearings-only localization problem in the presence of observer position errors. Firstly, the unknown matrix perturbation information is utilized to form the WRTLS problem. Then, the corresponding constrained optimization problem is transformed into an unconstrained one, which is a generalized Rayleigh quotient minimization problem. Thus, the solution can be got through the generalized eigenvalue decomposition and requires no initial state guess process. Simulation results indicate that the proposed algorithm can approach the Cramer-Rao lower bound （CRLB）, and the localization solution is asymptotically unbiased.

关键词： passive localization bearing weighted restricted total least square (WRTLS) generalized Rayleigh quotient.

Solution-processable through-space charge-transfer emitters via solubilizing groups modification

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npj Flexible Electronics 2022年第1期6卷 771-777页

作者： Qi Zheng Xue-Qi wang Yang-Kun qu Guohua Xie Liang-Sheng Liao Zuo-quan Jiang Institute of Functional Nano&Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow University199 Ren’ai RoadSuzhou 215123 JiangsuPR China Sauvage Center for Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic MaterialsDepartment of ChemistryWuhan UniversityWuhan 430072 HubeiPR China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipa999078 MacaoSARPR China

The solubility of luminescent materials is a key parameter to improve the electroluminescent performances of solution-processed organic light-emitting diodes(OLEDs).The through-space charge transfer(TSCT)materials provide an alternative to introduce the solubilizing groups(SGs)to the ***,the tert-butyl and n-hexyl groups are introduced as SGs at C7 positions of spiro structure,named C6-DMB and tBu-DMB,away from the *** has no influence on the photophysical properties of the parent TSCT *** efficient solution-processed OLEDs were demonstrated with the maximum external quantum efficiencies of 21.0%and 21.7%,*** the best of our knowledge,these are champions in the state-of-the-art solution-processed OLEDs with TSCT *** work confirmed our conjecture of constructing highly efficient soluble emitters by transforming an outstanding TSCT material from thermal evaporation to solution-processed OLEDs with SGs simply integrated on the‘bridge’linker.

关键词： emitter charge transfer

Disappearance of a coronal hole induced by a filament activation

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Research in Astronomy and Astrophysics 2014年第11期14卷 1481-1490页

作者： Lin Ma Zhong-quan qu Xiao-Li Yan Zhi-Ke Xue Yunnan Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

We present a rare observation of direct magnetic interaction between an activating filament and a coronal hole （CH）. The filament was a quiescent one located at the northwest of the CH. It underwent a nonradial activation, during which filament material constantly fell and intruded into the CH. As a result, the CH was clearly destroyed by the intrusion. Brightenings appeared at the boundaries and in the interior of the CH, meanwhile, its west boundaries began to retreat and the area gradually shrank. It is noted that the CH went on shrinking after the end of the intrusion and finally disappeared entirely. Following the filament activation, three coronal dimmings （D1-D3） were formed, among which D1 and D2 persisted throughout the complete disappearance of the CH. The derived coronal magnetic configuration shows that the filament was located below an extended loop system, which obviously linked D1 to D2. By extrapolating this result, our observations imply that the interaction between the filament and the CH involved direct intrusion of the filament material to the CH and the disappearance of the CH might be due to interchange reconnection between the expanding loop system and the CH＇s open field.

关键词： Sun activity -- Sun filaments -- Sun magnetic fields -- Sun evolution

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服务器无感知计算系统性能优化技术研究综述

软件学报 2025年第1期36卷 47-78页

作者：杨光刘杰曲慕子王帅叶丹钟华中国科学院大学中国科学院软件研究所软件工程技术研究开发中心计算机科学国家重点实验室(中国科学院软件研究所)

服务器无感知计算是新兴的云计算模式,它基于“函数即服务(FaaS)”的范式,以函数为部署和调度的基本单位,为用户提供大规模并行和自动伸缩的函数执行服务,且无需用户管理底层资源.对于用户,服务器无感知计算能够帮助他们摆脱集群底层基... 详细信息

服务器无感知计算是新兴的云计算模式,它基于“函数即服务(FaaS)”的范式,以函数为部署和调度的基本单位,为用户提供大规模并行和自动伸缩的函数执行服务,且无需用户管理底层资源.对于用户,服务器无感知计算能够帮助他们摆脱集群底层基础设施管理的负担,专注于业务层的开发和创新;对于服务提供商,服务器无感知计算将应用分解为细粒度的函数,极大地提高了调度效率和资源利用率.显著的优势让服务器无感知计算迅速吸引了业界的注意,然而,服务器无感知计算与传统云计算迥然不同的计算模式以及对任务各方面的严格限制给应用的迁移带来了诸多障碍,各种越来越复杂的任务也对服务器无感知计算的性能提出了越来越高的要求,服务器无感知计算的性能优化成为一个重要的研究课题.从4个方面对服务器无感知计算系统性能优化技术的相关研究工作进行梳理和综述,并介绍现有的系统实现.(1)介绍面向典型任务的优化技术,包括任务适配和针对特定任务的系统优化;(2)综述沙箱环境的优化工作,包括沙箱方案和冷启动优化技术,它们是决定函数运行速度的核心;(3)概括I/O和通信技术的优化,它们是服务器无感知计算应用程序的主要性能瓶颈;(4)简述相关的资源调度技术,包括面向平台和面向用户的调度策略,它们决定着系统的资源利用率和任务的执行效率.最后,总结当前服务器无感知计算性能优化技术所面临的问题和挑战,并展望未来可能的发展方向.

关键词：服务器无感知计算函数即服务云函数云计算性能优化

Comprehensive contour prediction model of work rolls in hot wide strip mill

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Journal of University of Science and Technology Beijing 2007年第3期14卷 240-245页

作者： Xiaodong wang quan Yang Anrui He Renzhong wang National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing 100083 China

The predictive calculation of comprehensive contour of work rolls in the on-line strip shape control model during hot rolling consists of two important parts of wear contour calculation and thermal contour calculation, which have a direct influence on the ac- curacy of shape control. A statistical wear model and a finite difference thermal contour model of work rolls were described. The comprehensive contour is the equivalence treatment of the sum of grinding, wear, and thermal contours. This comprehensive contour calculation model has been applied successfully in the real on-line strip shape control model. Its high precision has been proved through the large amounts of actual roll profile measurements and theoretical analyses. The hit rates （percent of shape index satisfying re- quirement） of crown and head flatness of the strips rolled, by using the shape control model, which includes the comprehensive contour calculation model, have about 16% and 10% increase respectively, compared to those of strips rolled by using manual operation.

关键词： hot rolled strip strip shape control comprehensive contour wear contour thermal contour