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Adaptive watermark generation mechanism based on time series prediction for stream processing

Frontiers of Computer science 2021年第6期15卷 59-73页

作者： Yang SONG Yunchun LI Hailong YANG Jun XU Zerong LUAN Wei LI Sino-German Joint Software Institute Beihang UniversityBeijing 100191China School of Computer Science and Engineering Beihang UniversityBeijing 100191China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing 100854China College of Life Sciences and Bioengineering Beijing University of TechnologyBeijing 100083China

The data stream processing framework processes the stream data based on event-time to ensure that the request can be responded to in *** reality,streaming data usually arrives out-of-order due to factors such as network *** data stream processing framework commonly adopts the watermark mechanism to address the data *** is a special kind of data inserted into the data stream with a timestamp,which helps the framework to decide whether the data received is late and thus be *** watermark generation strategies are periodic;they cannot dynamically adjust the watermark distribution to balance the responsiveness and *** paper proposes an adaptive watermark generation mechanism based on the time series prediction model to address the above *** mechanism dynamically adjusts the frequency and timing of watermark distribution using the disordered data ratio and other lateness properties of the data stream to improve the system responsiveness while ensuring acceptable result *** implement the proposed mechanism on top of Flink and evaluate it with realworld *** experiment results show that our mechanism is superior to the existing watermark distribution strategies in terms of both system responsiveness and result accuracy.

关键词： data stream processing watermark time series based prediction dynamic adjustment

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General theory for designing phonon transport in alloyed/doped materials

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science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 133-140页

作者： Chenhan Liu Chao Wu Wei Liu Yunshan Zhao Gang Zhang Hongmin Yang Yunfei Chen Micro-and Nano-scale Thermal Measurement and Thermal Management Laboratory Key Laboratory of Numerical Simulation for Large Complex SystemsMinistry of EducationSchool of Energy and Mechanical EngineeringNanjing Normal UniversityNanjing210023China School of Electrical and Automation Engineering Nanjing Normal UniversityNanjing210023China Phonon Engineering Research Center of Jiangsu Province Center for Quantum Transport and Thermal Energy ScienceInstitute of Physics Frontiers and Interdisciplinary SciencesSchool of Physics and TechnologyNanjing Normal UniversityNanjing210023China Agency for Science Technology and ResearchInstitute of High-Performance ComputingSingapore138632Singapore Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing211100China

Alloying/doping is a widely used technique for improving the electrical,mechanical,and optical properties of ***,this technology induces significant distortions in the lattice structure,mass distribution,and potential field,greatly enhancing phonon ***,we introduce the concept of alloying/doping path and employ crystal symmetry,lattice deformation,and electron distribution to characterize *** on this new concept,the phonon thermal transport behavior in alloyed/doped materials can be well designed,and along different alloying/doping paths,the difference in thermal conductivity can be up to 45 *** one hand,strategic alloying/doping that combines high crystal symmetry,large lattice contraction,and the same electron distribution suppresses phonon-phonon scattering phase space,induces phonon stiffening,and bolsters electronic structure symmetry,*** synergistic effects significantly improve thermal *** the other hand,random alloying/doping has a low symmetry,leading to the typical“U”shape of alloying/doping level-dependent thermal *** theory is corroborated in three-dimensional(3D)Si,2D MoS_(2),and quasi-1D TiS_(3),affirming its efficacy and broad applicability in controlling phonon transport.

关键词： phonon transport alloyed/doped materials crystal symmetry lattice contraction electronic structure

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Research on the information System architecture design framework and reference resources of American Army 3

Research on the information System architecture design frame...

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3rd International Conference on Advanced Information science and System, AISS 2021

作者： Jian, Ping Space Engineering University Science and Technology Complex Electronic System Simulation Laboratory China

ISBN: (纸本)9781450385862

The concept of architecture is put forward by the US Army, which refers to the composition structure of the system and its mutual relationship, as well as the principles and guidelines guiding the design and development of the system. Architecture design technology and its reference resources have important theoretical and technical support for the top-level design of information system. Based on the analysis of architecture technology and function, this paper systematically studies the connotation and development history of the architecture design framework of the US army, and sorts out the main reference resources of the architecture design of the US army, such as the common joint task list, information system interoperability level model, joint technology architecture. It provides useful reference for the theoretical and technical research of information system top-level design. © 2021 ACM.

关键词： Information use

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Interference Cancellation and Iterative Multi-User Detection for Satellite OTFS-NOMA Networks 22

Interference Cancellation and Iterative Multi-User Detection...

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22nd International Conference on Optical Communications and Networks, ICOCN 2024

作者： Sun, Meng Zhang, Qi Xin, Xiangjun Chai, Furong Li, Yuanfeng Wang, Yanxiang Zhao, Yi Tian, Feng Tian, Qinghua Wang, Yongjun Beijing100876 China Beijing Key Laboratory of Space-round Interconnection and Convergence Beijing100876 China National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha410073 China School of Information and Electronics Beijing Institute of Technology Beijing100081 China Beijing Institute of Control and Electronic Technology Beijing100038 China

An iterative multiuser detection based on channel matched filtering and interference cancellation is proposed for satellite-terrestrial OTFS-NOMA systems. simulation results demonstrate that our algorithm effectively ... 详细信息

ISBN: (纸本)9798350367652

关键词： Multiuser detection

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Bayesian Inference of Mechanical Property Parameters and Layup Orientation Angle in a Composite Wing

Bayesian Inference of Mechanical Property Parameters and Lay...

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2023 International Annual Conference on Complex systems and Intelligent science, CSIS-IAC 2023

作者： Gong, Yulian Tang, Yuhua Zhang, Jianguo Beihang University School of Reliability and Systems Engineering Beijing China Technology and Industry for National Defence Prc Deep Space Exploration Laboratory State Administration of Science Beijing China

ISBN: (纸本)9798350309003

A Bayesian method is adopted to infer the mechanical property parameters and layup orientation angle of a composite wing in this paper. In order to make the calculation feasible, a basis-adaptive PC-Kriging model is proposed, which can replace the finite element model of the composite wing accurately. Considering that the simulation model of the composite wing is a high-dimensional model, AIES algorithm is used to model calibration of the composite wing, because it shows good performance in processing high-dimensional strongly correlated posterior distribution parameters. Finally, comparing the predicted parameters with the real parameters, the error is found to be small, which indicates that the proposed Bayesian method has good performance. © 2023 IEEE.

关键词： Kriging

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Certifiable Optimal Visual Pose Estimation for space Applications 4th

Certifiable Optimal Visual Pose Estimation for Space Applic...

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4th International Conference on Artificial Intelligence in China, AIC 2022

作者： Wang, Yue Zhang, Xin Key Laboratory of Electronics and Information Technology for Complex Space Systems National Space Science Center Chinese Academy of Sciences Beijing100190 China Tianjin Key Laboratory of Wireless Mobile Communications and Power Transmission Tianjin Normal University Tianjin300387 China

ISBN: (纸本)9789819912551

Visual pose estimation is essential for many space applications, such as autonomous robots for planetary exploration, asteroid exploration, and spacecraft pose estimation. However, the high reliability requirement of space applications cannot be satisfied by general visual pose estimation algorithms based on heuristic local optimization. This paper briefly introduce certifiable optimal algorithms for the visual pose estimation framework to the aerospace research community, including both visual relative pose estimation problem and pose-graph optimization problem. The original optimization problem is reformulated as a quadratically constrained quadratic program (QCQP) problem, whose Lagrangian dual function is a semidefinite programming (SDP) problem which is convex. simulation results demonstrate the feasibility of certifiable optimal visual pose estimation algorithms based on the zero duality gap for typical application scenarios. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Global optimization

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Combined active and passive adaptive variable admittance compliant control for space robotic manipulators

Combined active and passive adaptive variable admittance com...

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2023 IEEE International Conference on Robotics and Biomimetics, ROBIO 2023

作者： Gao, Hang Zhang, Xiaodong Ma, Chao Zhou, Cheng University of Science and Technology Beijing School of Mechanical Engineering Beijing100083 China Beijing Institute of Spacecraft System Engineering Cast Beijing Key Laboratory of Intelligent Space Robotic Systems Technology and Application China

ISBN: (纸本)9798350325706

This paper develops a combined active and passive adaptive variable admittance compliant control algorithm for space robotic manipulators. In fact, the assembly task for space robots requires compliance and precision while ensuring avoidance of any occurrences of rigid collision throughout the process. Therefore, we design a new combined active and passive variable admittance control structure combined with the following three parts to meet these acquirements. Firstly, we develop an active variable admittance algorithm to facilitate the space robot rapid movement, enabling it to achieve higher speeds while maintaining compliance. Then, to mitigate the occurrence of unforeseen rigid collisions during the robot motion, we devise a passive variable admittance control algorithm, which aims to minimize the impact of collision events and ensure the robot safe operation. Furthermore, by employing the Lyapunov theory, a new active adaptive variable admittance control algorithm is presented for robot constant force output. Consequently, through contrast experiments, we demonstrate the effectiveness and enhanced performance of the proposed algorithm. © 2023 IEEE.

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Particle shape effect on hydrodynamics and heat transfer in spouted bed:A CFD-DEM study

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Particuology 2022年第10期20卷 10-21页

作者： Dianyu E Peng Zhou Suya Guo Jia Zeng Jiaxin Cui Youyuan Jiang Yuanxiang Lu Zeyi Jiang Zhengquan Li Shibo Kuang Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyGanzhou 341000China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan 411101China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityClaytonVIC 3800Australia

Spouted bed has drawn much attention due to its good heat and mass transfer efficiency in many chemical *** the flow patterns and heat and mass transfer inside a spouted bed can help optimize the spouting ***,in this study,the effects of particle shape on the hydrodynamics and heat transfer in a spouted bed are *** is done by using a validated computational fluid dynamics-discrete element method(CFD-DEM)model,considering volume-equivalent spheres and oblate and prolate *** results are analysed in detail in terms of the flow pattern,microstruc-ture,and heat transfer *** numerical results show that the prolate spheroids(Ar=2.4)form the largest bubble from the beginning of the spouting process and rise the highest because the fluid drag forces can overcome the interlocking and particle-particle frictional *** with spherical particles,ellipsoidal spheroids have better mobility because of the stronger rotational kinetic energy resulting from the rough surfaces and nonuniform *** addition,the oblate spheroid system exhibits better heat transfer performance benefiting from the larger surface area,while prolate spheroids have poor heat transfer efficiency because of their orientation *** findings can serve as a reference for optimizing the design and operation of complex spouted beds.

关键词： Spouted bed Gas-solid flow Particle shape CFD-DEM Heat transfer

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A Multi-Modal Multi-Objective Evolutionary Algorithm Based on Dual Decomposition and Subset Selection

SSRN

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SSRN 2023年

作者： Xiong, Minghui Xiong, Wei Liu, Zheng Liu, Yali Han, Chi Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing101416 China

Multi-modal multi-objective problems (MMOPs) arise frequently in real world applications, in which multiple Pareto-optimal solution sets (PSs) correspond to the same point on the Pareto front (PF). Diversity preservation is a crucial issue in multi-modal multi-objective evolutionary algorithms (MMEAs), which aims at evolving the population toward the PF and equivalent PSs with a uniform distribution and good spread. In spite of many diversity preservation approaches in MMEAs, most of them guarantee the diversity in decision space with a degraded performance in objective space. To address the above issues, this article proposes a MMEA based on dual decomposition and subset selection, which employes the weight vectors and grids to decompose both the objective and decision spaces. On the basis of dual decomposition, the mating selection are adaptively performed based on estimated optimization stages of current subproblem. Moreover, a subset with good diversity in both the objective and decision spaces are selected from the promising solutions ever collected during the evolution process. Experimental results on 22 benchmark problems demonstrate our advantages to maintain a more balanced diversity in both objective and decision spaces. © 2023, The Authors. All rights reserved.

关键词： Multiobjective optimization

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Status and analysis of process mining algorithm classification 5

Status and analysis of process mining algorithm classificati...

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5th IEEE Information technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

作者： Lin, Wenxiang Liu, Desheng Space Engineering University Science and Technology on Complex Electronic System Simulation Laboratory Beijing China

ISBN: (纸本)9781665415989

In view of the rapid development of process mining, the rapid update of related algorithms, and the urgent need to sort out a reasonable classification method, the research on the current status of process mining algorithm classification is carried out. First, conduct statistical visualization analysis of process mining algorithms from different data sources, then analyze and summarize the specific algorithm classification literature at home and abroad in chronological order, and discuss its classification methods and advantages and disadvantages. From the research results, there are four main classification methods of algorithms, among which, based on the characteristics of the algorithm, it has the advantages of small crossover and obvious algorithm characteristics. © 2021 IEEE.

关键词： Visualization

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