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Recursive Filtering for Stochastic Systems w.th Filter-and-Forw.rd Successive Relays

IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1202-1212页

作者： Hailong Tan Bo Shen qi Li Hongjian Liu School of Mathematics-Physics and Finance Anhui Polytechnic UniversityWuhu 241000China Anhui Future Technology Research Institute Anhui Polytechnic UniversityWuhu 241000China College of Information Science and Technology Donghua UniversityShanghai 201620China Engineering Research Center of Digitalized Textile and Fashion Technology Ministry of EducationShanghai 201620China School of Information Science and Engineering Hangzhou Normal UniversityHangzhou 311121China

In this paper,the recursive filtering problem is considered for stochastic systems over filter-and-forw.rd successive relay(FFSR)*** FFSR is located betw.en the sensor and the remote filter to forw.rd the *** the successive relay,tw. cooperative relay nodes are adopted to forw.rd the signals alternatively,thereby existing sw.tching characteristics and inter-relay interferences(IRI).Since the filter-and-forw.rd scheme is employed,the signal received by the relay is retransmitted after it passes through a linear *** objective of the paper is to concurrently design optimal recursive filters for FFSR and stochastic systems against sw.tching characteristics and IRI of ***,a uniform measurement model is proposed by analyzing the transmission mechanism of ***,novel filter structures w.th sw.tching parameters are constructed for both FFSR and stochastic *** the help of the inductive method,filtering error covariances are presented in the form of coupled difference ***,the desired filter gain matrices are further obtained by minimizing the trace of filtering error ***,the stability performance of the filtering algorithm is analyzed w.ere the uniform bound is guaranteed on the filtering error ***,the effectiveness of the proposed filtering method over FFSR is verified by a three-order resistance-inductance-capacitance circuit system.

关键词： filtering successive stochastic

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Uncertain know.edge graph embedding:an effective method combining multi-relation and multi-path

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Frontiers of Computer Science 2024年第3期18卷 73-89页

作者： qi LIU qinghua ZHANG Fan ZHAO Guoyin w.NG Key Laboratory of Tourism Multisource Data Perception and Decision Ministry of Culture and TourismChongqing University of Posts and TelecommunicationsChongqing 400065China Chongqing Key Laboratory of Computational Intelligence Chongqing University of Posts and TelecommunicationsChongqing 400065China Chongqing Key Laboratory of Big Data Intelligent Computing Chongqing University of Posts and TelecommunicationsChongqing 400065China

Uncertain Know.edge Graphs(UKGs)are used to characterize the inherent uncertainty of know.edge and have a richer semantic structure than deterministic know.edge *** research on the embedding of UKG has only recently begun,Uncertain Know.edge Graph Embedding(UKGE)model has a certain effect on solving this ***,there are still unresolved *** the one hand,w.en reasoning the confidence of unseen relation facts,the introduced probabilistic soft logic cannot be used to combine multi-path and multi-step global information,leading to information *** the other hand,the existing UKG embedding model can only model symmetric relation facts,but the embedding problem of asymmetric relation facts has not be *** address the above issues,a Multiplex Uncertain Know.edge Graph Embedding(MUKGE)model is proposed in this ***,to combine multiple information and achieve more accurate results in confidence reasoning,the Uncertain ResourceRank(URR)reasoning algorithm is ***,the asymmetry in the UKG is *** embed asymmetric relation facts of UKG,a multi-relation embedding model is ***,experiments are carried out on different datasets via 4 tasks to verify the effectiveness of *** results of experiments demonstrate that MUKGE can obtain better overall performance than the baselines,and it helps advance the research on UKG embedding.

关键词： know.edge representation uncertain know.edge graph multi-relation embedding uncertain reasoning

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Review.on heat-to-pow.r conversion technologies for hypersonic vehicles

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Chinese Journal of Aeronautics 2024年第5期37卷 148-179页

作者： Yinke qi Xiaofeng MA Peixue JIANG Yinhai ZHU Key Laboratory for Thermal Science and Pow.r Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Beijing Key Laboratory of CO_(2)Utilization and Reduction Technology Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

Hypersonic vehicles have enormous military and economic value,w.ile their pow.r and thermal protection demands w.ll increase substantially w.th the rise in Mach number and *** the tremendous high-quality heat on the vehicle surface and engine w.ll into electrical energy through heat-to-pow.r technologies w.ll not only play a role in thermal protection,but also supply pow.r for the *** paper provides a comprehensive review.of heat-to-pow.r conversion technologies on hypersonic vehicles,including the indirect conversion of Brayton and Rankine cycles,direct conversion of thermoelectric materials,and combined *** the open Brayton cycle w.th hydrocarbon fuel as the w.rking fluid,the Pow.r-to-w.ight Ratio(Pw.)can achieve the highest,at around 1.8,due to the high Pw. of the hydrocarbon fuel turbine and the few.components of the ***,its w.rk capacity is limited by the flow.rate of the supplied *** closed Brayton cycle can maintain a relatively high Pw.,ranging from 0.2 to 0.8,w.ile achieving relatively high output pow.r and conversion *** Rankine cycle has a higher Pw.,its range is close to that of the closed Brayton cycle,peaking at about *** thermoelectric materials technology has a small pow.r generation level,making it more suitable for scenarios w.th low.pow.r *** review.provides a basis for selecting and developing heat-to-pow.r conversion technologies on hypersonic vehicles.

关键词： Hypersonic vehicles Heat-to-pow.r conversion Brayton cycle Rankine cycle Thermoelectric materials

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Dynamic Scene Graph Generation of Point Clouds w.th Structural Representation Learning

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Tsinghua Science and Technology 2024年第1期29卷 232-243页

作者： Chao qi Jianqin Yin Zhicheng Zhang Jin Tang School of Artificial Intelligence Beijing University of Posts and TelecommunicationsBeijing 100876China Standard and Metrology Research Institute China Academy of Railway Sciences Corporation LimitedBeijing 100081China

Scene graphs of point clouds help to understand object-level relationships in the 3D *** graph generation methods w.rk on 2D structured data,w.ich cannot be used for the 3D unstructured point cloud *** point-cloud-based methods generate the scene graph w.th an additional graph structure that needs labor-intensive manual *** address these problems,w. explore a method to convert the point clouds into structured data and generate graphs w.thout given ***,w. cluster points w.th similar augmented features into groups and establish their relationships,resulting in an initial structural representation of the point ***,w. propose a Dynamic Graph Generation Netw.rk(DGGN)to judge the semantic labels of targets of different *** dynamically splits and merges point groups,resulting in a scene graph w.th high *** show.that our methods outperform other baseline *** output reliable graphs describing the object-level relationships w.thout additional manual labeled data.

关键词： scene graph generation structural representation point cloud

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Visual experimental study of nanofluids application to promote CO_(2) absorption in a bubble column

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Chinese Journal of Chemical Engineering 2024年第3期67卷 228-237页

作者： Shangyuan Cheng Guisheng qi Yuliang Li Yixuan Yang Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China

The addition of dispersed-phase nanoparticles in the liquid phase can enhance the gas-liquid transfer process as the suspended nanoparticles affect the transfer process inside the fluid through microdisturbance or micro-convection *** this article,a high-speed digital camera w.s used to visualize the bubble behavior of CO_(2) in pure w.ter and nanofluids to examine the effects of CO_(2) gas flow.rate,nanoparticle solid content and type on the bubble behavior in the *** CO_(2) absorption performance in three w.ter-based nanofluids w.re compared in a *** the mass transfer characteristics during CO_(2) bubble absorption and the reasons for the enhanced gas-liquid mass transfer effect of nanoparticles w.re *** results show.d that the presence of nanoparticles affected the formation process of bubbles in the fluid,shortened the bubble detachment time,reduced the detachment diameter,effectively increased the gas-liquid contact area,and improved the bubbles detachment *** system w.th MCM-41 corresponded to a higher overall mass transfer *** MCM-41 contained surfactant that enhanced foaming behavior in *** prevented the transfer of CO_(2) to some extent,and the CO_(2) absorption by uncalined MCM-41/H_(2)O w.s 5.34%higher than that by pure *** w.th SiO_(2) nanoparticles w.th the same particle size and the same composition,MCM-41 had a higher adsorption capacity and better hydrophilicity due to its larger specific surface area and rich porous structure,w.ich w.s more favorable to accelerate the collision betw.en nanoparticles and CO_(2) bubbles to cause *** the condition of 0.1%(mass)solid content,the enhancement of CO_(2) absorption process by MCM-41 nanoparticles w.s more significant and improved by 16.9%compared w.th pure w.ter.

关键词： Nanofluids CO_(2) absorption Mass transfer MCM-41 Bubble column

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A Planning Method for Operational Test of UAV Sw.rm Based on Mission Reliability

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1889-1918页

作者： Jingyu w.ng Ping Jiang Jianjun qi College of Systems Engineering National University of Defense TechnologyChangsha410073China Beijing Special Engineering Design Institution Beijing100028China

The unmanned aerial vehicle(UAV)sw.rm plays an increasingly important role in the modern battlefield,and the UAV sw.rm operational test is a vital means to validate the combat effectiveness of the UAV *** to the high cost and long duration of operational tests,it is essential to plan the test in *** solve the problem of planning UAV sw.rm operational test,this study considers the multi-stage feature of a UAV sw.rm mission,composed of launch,flight and combat stages,and proposes a method to find test plans that can maximize mission ***,a multi-stage mission reliability model for a UAV sw.rm is proposed to ensure successful implementation of the mission.A multi-objective integer optimization method that considers both mission reliability and cost is then formulated to obtain the optimal test *** study first constructs a mission reliability model for the UAV sw.rm in the combat ***,the launch stage and flight stage are integrated to develop a complete PMS(Phased Mission Systems)reliability ***,the Binary Decision Diagrams(BDD)and Multi Objective Quantum Particle Sw.rm Optimization(MOQPSO)methods are proposed to solve the *** optimal plans considering both reliability and cost are *** proposed model supports the planning of UAV sw.rm operational tests and represents a meaningful exploration of UAV sw.rm test planning.

关键词： UAV sw.rm PMS MOQPSO BDD mission reliability operational test planning

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Boundary points, minimal L^(2) integrals and concavity property Ⅱ: w.akly pseudoconvex Kähler manifolds

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Science China Mathematics 2024年第7期67卷 1665-1718页

作者： qi’an Guan Zhitong Mi Zheng Yuan School of Mathematical Sciences Peking UniversityBeijing100871China School of Mathematics and Statistics Beijing Jiaotong UniversityBeijing100044China Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing100190China

In this paper, w. consider minimal L^(2) integrals on the sublevel sets of plurisubharmonic functions on w.akly pseudoconvex K?hler manifolds w.th Lebesgue measurable gain related to modules at boundary points of the sublevel sets, and establish a concavity property of the minimal L^(2) integrals. As applications, w. present a necessary condition for the concavity degenerating to linearity, a concavity property related to modules at inner points of the sublevel sets, an optimal support function related to modules, a strong openness property of modules and a tw.sted version, and an effectiveness result of the strong openness property of modules.

关键词： minimal L^(2)integrals plurisubharmonic functions boundary points w.akly pseudoconvex K?hler manifold

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Quantum correlations in a chain-type quantum netw.rk

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Communications in Theoretical Physics 2024年第6期76卷 77-91页

作者： Xiaofei qi Aihong Zhai Lihua Yang School of Mathematical Science Shanxi UniversityTaiyuan 030006China Key Laboratory of Complex Systems and Data Science of Ministry of Education Shanxi UniversityTaiyuan 030006China School of Mathematics and Information Technology Yuncheng UniversityYuncheng 044000China

A quantum netw.rk concerns several independent entangled resources and can create strong quantum correlations by performing joint measurements on some *** this paper,w. discuss an n-partite chain netw.rk w.th each of tw. neighboring observers sharing an arbitrary Bell state and all intermediate observers performing some positive-operator-valued measurements w.th parameterλ.The expressions of all post-measurement states betw.en any tw. observers are obtained,and their quantifications of Bell nonlocality,Einstein-Podolsky-Rosen steering and entanglement w.th different ranges ofλare respectively detected and analyzed.

关键词： quantum correlation nonlocality entanglement chain-type quantum netw.rk

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One-shot Face Reenactment w.th Dense Correspondence Estimation

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Machine Intelligence Research 2024年第5期21卷 941-953页

作者： Yunfan Liu qi Li Zhenan Sun School of Artificial Intelligence University of Chinese Academy of SciencesBeijing100049China Center for Research on Intelligent Perception and Computing Institute of AutomationChinese Academy of SciencesBeijing100190China

One-shot face reenactment is a challenging task due to the identity mismatch betw.en source and driving *** existing methods fail to completely eliminate the interference of driving subjects’identity information,w.ich may lead to face shape distortion and undermine the realism of reenactment *** solve this problem,in this paper,w. propose using a 3D morphable model(3DMM)for explicit facial semantic decomposition and identity *** of using 3D coefficients alone for reenactment control,w. take advantage of the generative ability of 3DMM to render textured face *** proxies contain abundant yet compact geometric and semantic information of human faces,w.ich enables us to compute the face motion field betw.en source and driving images by estimating the dense *** this w.y,w. can approximate reenactment results by w.rping source images according to the motion field,and a generative adversarial netw.rk(GAN)is adopted to further improve the visual quality of w.rping *** experiments on various datasets demonstrate the advantages of the proposed method over existing state-of-the-art benchmarks in both identity preservation and reenactment fulfillment.

关键词： Generative adversarial netw.rks face image manipulation face image synthesis face reenactment 3D morphable model

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Determination of the Pile Drivability Using Random Forest Optimized by Particle Sw.rm Optimization and Bayesian Optimizer

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Computer Modeling in Engineering & Sciences 2024年第10期141卷 871-892页

作者： Shengdong Cheng Juncheng Gao Hongning qi State Key Laboratory of Eco-Hydraulics in Northw.st Arid Region Xi’an University of TechnologyXi’an710048China School of Resources and Safety Engineering Central South UniversityChangsha410083China

Driven piles are used in many geological environments as a practical and convenient structural ***,the determination of the drivability of piles is actually of great importance in complex geotechnical *** methods of predicting pile drivability often rely on simplified physicalmodels or empirical formulas,w.ichmay lack accuracy or applicability in complex geological ***,this study presents a practical machine learning approach,namely a Random Forest(RF)optimized by Bayesian Optimization(BO)and Particle Sw.rm Optimization(PSO),w.ich not only enhances prediction accuracy but also better adapts to varying geological environments to predict the drivability parameters of piles(i.e.,maximumcompressive stress,maximum tensile stress,and blow.per foot).In addition,support vector regression,extreme gradient boosting,k nearest neighbor,and decision tree are also used and applied for comparison *** order to train and test these models,among the 4072 datasets collected w.th 17model inputs,3258 datasets w.re randomly selected for training,and the remaining 814 datasets w.re used for model ***,the results of these models w.re compared and evaluated using tw. performance indices,i.e.,the root mean square error(RMSE)and the coefficient of determination(R2).The results indicate that the optimized RF model achieved low.r RMSE than other prediction models in predicting the three parameters,specifically 0.044,0.438,and 0.146;and higher R2 values than other implemented techniques,specifically 0.966,0.884,and *** addition,the sensitivity and uncertainty of the optimized RF model w.re analyzed using Sobol sensitivity analysis and Monte Carlo(MC)*** can be concluded that the optimized RF model could be used to predict the performance of the pile,and it may provide a useful reference for solving some problems under similar engineering conditions.

关键词： Random forest regression model pile drivability Bayesian optimization particle sw.rm optimization

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