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arXiv 2024年

作者： Pei, Wenjie Xu, WeiNa Wu, Zongze Li, Weichao Wang, Jinfan Lu, Guangming Wang, Xiangrong Department of Computer Science Harbin Institute of Technology at Shenzhen Shenzhen518172 China Institute of Future Networks Southern University of Science and Technology Shenzhen518055 China College of Mechatronics and Control Engineering Shenzhen University Shenzhen518060 China Peng Cheng Laboratory Shenzhen518066 China

The crux of graph classification lies in the effective representation learning for the entire graph. Typical graph neural networks focus on modeling the local dependencies when aggregating features of neighboring nodes, and obtain the representation for the entire graph by aggregating node features. Such methods have two potential limitations: 1) the global node saliency w.r.t. graph classification is not explicitly modeled, which is crucial since different nodes may have different semantic relevance to graph classification;2) the graph representation directly aggregated from node features may have limited effectiveness to reflect graph-level information. In this work, we propose the Saliency-Aware Regularized Graph Neural Network (SAR-GNN) for graph classification, which consists of two core modules: 1) a traditional graph neural network serving as the backbone for learning node features and 2) the Graph Neural Memory designed to distill a compact graph representation from node features of the backbone. We first estimate the global node saliency by measuring the semantic similarity between the compact graph representation and node features. Then the learned saliency distribution is leveraged to regularize the neighborhood aggregation of the backbone, which facilitates the message passing of features for salient nodes and suppresses the less relevant nodes. Thus, our model can learn more effective graph representation. We demonstrate the merits of SAR-GNN by extensive experiments on seven datasets across various types of graph data. Code will be released. © 2024, CC BY.

关键词： Graph neural networks

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Identification of Unknown Inertia Parameters of Spacecraft and Spacecraft Hovering

Identification of Unknown Inertia Parameters of Spacecraft a...

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第40届中国控制会议

作者： Guangquan Duan Guo-Ping Liu Zhong-Hua Pang Center for Control Theory and Guidance Technology Harbin Institute of Technology Department of Artificial Intelligence and Automation Wuhan University School of Electrical and Control Engineering North China University of Technology

It is necessary to know the inertia parameters of the spacecraft when the spacecraft attitude is controlled accurately in space. So it is very important to identify the moment of inertia of the spacecraft. In this paper, the satellite simulator（air floating platform） is studied. When the actuator provides stable thrust, the angular velocity generated by the open-loop control is measured by the sensor, and the collected data is filtered and fused to obtain an accurate moment of inertia. The digital PID simulation was carried out recently. According to the controller used in the simulation, the satellite simulator physical experiment was carried out. The experimental results verified the accuracy of the identification of the moment of inertia.

关键词： Identification of Moment of Inertial Information Fusion Spacecraft Hovering

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Distributed Online Optimization in Time-Varying Unbalanced Networks without Explicit Subgradients

arXiv

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arXiv 2022年

作者： Xiong, Yongyang Li, Xiang You, Keyou Wu, Ligang The Department of Automation Beijing National Research Center for Information Science and Technology Tsinghua University Beijing100084 China The Department of Control Science and Engineering Harbin Institute of Technology Harbin150001 China

This paper studies a distributed online constrained optimization problem over time-varying unbalanced digraphs without explicit subgradients. In sharp contrast to the existing algorithms, we design a novel consensus-based distributed online algorithm with a local randomized zeroth-order oracle and then rescale the oracle by constructing row-stochastic matrices, which aims to address the unbalancedness of time-varying digraphs. Under mild conditions, the average dynamic regret over a time horizon is shown to asymptotically converge at a sublinear rate provided that the accumulated variation grows sublinearly with a specific order. Moreover, the counterpart of the proposed algorithm when subgradients are available is also provided, along with its dynamic regret bound, which reflects that the convergence of our algorithm is essentially not affected by the zeroth-order oracle. Simulations on distributed targets tracking problem and dynamic sparse signal recovery problem in sensor networks are employed to demonstrate the effectiveness of the proposed algorithm. Copyright © 2022, The Authors. All rights reserved.

关键词： Constrained optimization

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The TM single-atom catalytic system bidirectionally enhances the hydrogen absorption/desorption kinetics of Mg/MgH2: An insight into the synergetic enhancement mechanism and underlying principle

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Journal of Magnesium and Alloys 2024年

作者： Duan, Congwen Wang, Haimei Wang, Xinya Liu, Yupeng Wu, Jinhui Hu, Lianxi Liu, Bogu Huang, Haixiang Wang, Fei Wu, Ying Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China Institute of Energy Power Innovation North China Electric Power University Beijing102206 China School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China College of Materials Science and Engineering Sichuan University Chengdu610065 China

Mg/MgH2 has garnered significant attention primarily due to its abundant availability and high gravimetric density. Nevertheless, its practical implementation hindered by its high thermodynamic stability and sluggish kinetics. Fortunately, the introduction of transition metal single atom (TM SA) catalysts has emerged as an effective method to enhance the hydrogen storage properties of Mg/MgH2. Among these catalysts, the synergistic effect of nanoconfinement and TM SAs plays a pivotal role in the hydriding/dehydriding kinetics of Mg/MgH2. However, the effects of varying TM SAs interacting with N modified confined materials on H2 adsorption and desorption and underlying mechanisms remain enigmatic. Leveraging DFT calculations, we investigated the potential of combining TM SA catalysts with N-modified Carbon nanomaterials (CNT) to enhance the hydrogenation/dehydrogenation of Mg/MgH2. TM SA N[sbnd]CNTs-Mg/MgH2 heterojunction systems encompassing ten 3d/4d transition metals were designed and constructed. We systematically investigated the impact of TM SA N[sbnd]CNTs on the hydrogen absorption and desorption properties of Mg/MgH2 by examining parameters such as the electronic localization function (ELF), distorted charge density distributions, adsorption energies, dissociation energies, electronegativity, and the D-band center. Notably, the energy barriers for Mg/MgH2 hydrogenation and dehydrogenation were significantly reduced by 0.2–0.7 eV and 1.6–2.2 eV, respectively, through the catalytic promotion of TM SA N[sbnd]CNTs. Herein, a novel "electronic-ropeway" effect was proposed to elucidate the underlying mechanism responsible for enhancing the hydrogen absorption and desorption kinetics in Mg/MgH2. Specifically, the contribution degree of TM SA N[sbnd]CNTs and system electronegativity emerged as effective descriptors for predicting the reduced hydrogenation/dehydrogenation energy barriers. It is anticipated that elucidating the role of TM SA-N-CNTs will pave the way fo

关键词： Hydrogenation

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Dynamic area coverage for Multi-USV with fully connected constraint based on game theory

Dynamic area coverage for Multi-USV with fully connected con...

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Chinese Automation Congress (CAC)

作者： Xiao Han Huan Chen Yufeng Gao Guangfu Ma Shuanghong Wu Wenxin Hao Department of Control Science and Engineering Harbin Institute of Technology Harbin China China Ship Development and Design Center Wuhan China The Beijing Institute of Spacecraft System Engineering China Academy of Space Technology Beijing China

This paper proposes a novel method to solve the problem of regional surveys on the ocean in a complex environment. In order to solve this challenging regional survey problem considering fully connected, a new method combined artificial potential field and game theory is designed to maximize the coverage ratio. This paper gives the mathematical model of information transfer between two unmanned surface vehicles(USVs), and then the motion strategy of USVs is given based on the idea of game theory. The area coverage task of the multi-USV system is realized by a control method similar to the artificial potential field method.

关键词： Sea surface Automation Heuristic algorithms Dynamics control systems Mathematical models Game theory

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A Silicon Monoxide Lithium-Ion Battery Anode with Ultrahigh Areal Capacity

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Nano-Micro Letters 2022年第3期14卷 229-243页

作者： Jiang Zhong Tao Wang Lei Wang Lele Peng Shubin Fu Meng Zhang Jinhui Cao Xiang Xu Junfei Liang Huilong Fei Xidong Duan Bingan Lu Yiliu Wang Jian Zhu Xiangfeng Duan State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringSchool of Physics and ElectronicsHunan Key Laboratory of Two‑Dimensional MaterialsEngineering Research Center of Advanced Catalysis of the Ministry of EducationHunan UniversityChangsha 410082People’s Republic of China International Graduate School at Shenzhen Tsinghua UniversityShenzhen 518057People’s Republic of China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150090People’s Republic of China School of Energy and Power Engineering North University of ChinaTaiyuan 030051People’s Republic of China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA 90095USA

Silicon monoxide(SiO)is an attractive anode material for next-generation lithium-ion batteries for its ultra-high theoretical capacity of 2680 mAh g−*** studies to date have been limited to electrodes with a rela-tively low mass loading(<3.5 mg cm^(−2)),which has seriously restricted the areal capacity and its potential in practical *** areal capacity with such high-capacity materials is critical for capitalizing their potential in practi-cal ***,we report a monolithic three-dimensional(3D)large-sheet holey gra-phene framework/SiO(LHGF/SiO)composite for high-mass-loading *** specifically using large-sheet holey graphene building blocks,we construct LHGF with super-elasticity and exceptional mechanical robustness,which is essential for accommodating the large volume change of SiO and ensuring the structure integrity even at ultrahigh mass ***,the 3D porous graphene network structure in LHGF ensures excellent electron and ion *** systematically tailoring microstructure design,we show the LHGF/SiO anode with a mass loading of 44 mg cm^(−2)delivers a high areal capacity of 35.4 mAh cm^(−2)at a current of 8.8 mA cm^(−2)and retains a capacity of 10.6 mAh cm^(−2)at 17.6 mA cm^(−2),greatly exceeding those of the state-of-the-art commercial or research ***,we show an LHGF/SiO anode with an ultra-high mass loading of 94 mg cm^(−2)delivers an unprecedented areal capacity up to 140.8 mAh cm^(−2).The achievement of such high areal capacities marks a critical step toward realizing the full potential of high-capacity alloy-type electrode materials in practical lithium-ion batteries.

关键词： Silicon monoxide Large-sheet holey graphene Lithium-ion batteries High mass loading Ultra-high areal capacity

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Visual Sensing Algorithm for Soft Manipulator based on Self-Organizing Map

Visual Sensing Algorithm for Soft Manipulator based on Self-...

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第40届中国控制会议

作者： Weidi Han Haibo Zhang Yong Zhang Yueyong Lyu Yafei Yang Department of Control Science and Engineering Harbin Institute of Technology Beijing Institute of Control Engineering Shenyang Aircraft Design and Research Institute

Due to the continuous deformation characteristics of the soft manipulator, the sensor used for the rigid manipulator is no longer suitable for sensing the shape, which is required for subsequent closed-loop control. In this paper, a vision-based shape sensing algorithm for soft manipulators is proposed, which does not need to mark points in advance or use the 3D point cloud of the target. The algorithm uses self-organizing map network to cluster the target obtained by the stereo camera, and then performs 3D reconstruction on the cluster centers to get a series of 3D points containing shape and position information. Experiments were carried out and the parameters and errors of the algorithm are analyzed in detail.

关键词： soft manipulator shape sensing self-organizing map stereo camera

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Weight Design for Small Data Sample Decision under Attribute Association

Weight Design for Small Data Sample Decision under Attribute...

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Computer Science and Data engineering (CSDE), IEEE Asia-Pacific Conference on

作者： Shixuan Zhang Songpeng Sun Jie Ma Kai Zhang Xiaopeng Zheng Department of Control Science and Engineering Harbin Institute of Technology Harbin China Science and Technology on Space Physics Laboratory Beijing China Research and Development Department China Academy of Launch Vehicle Technology Beijing China

In aircraft test, the sample size of flight test data is small, and the test data returned by telemetry also has the problem of attribute association. A weight design method of small sample decision under attribute association is proposed. The method enhances the small sample data based on the synthetic minority oversampling technique, reduces the dimension of variables through principal component analysis, normalizes the principal components based on the variance contribution rate, and obtains the weight of each principal component after dimensionality reduction. The research results can be applied to the weight design of the guidance and control system of aircraft, and provide a new method support for the subsequent relevant test evaluation.

关键词： Dimensionality reduction Performance evaluation Design methodology Decision making control systems Data models Telemetry

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Transient Simulation of Oscillatory Gas-Liquid Taylor Flow and its Effects on Heat Transfer

SSRN

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SSRN 2023年

作者： Tao, Hai Zheng, Zhanying Gupta, Raghvendra Yee Leung, Sharon Shui Center for Turbulence Control Harbin Institute of Technology Shenzhen China Department of Chemical Engineering Indian Institute of Technology Assam Guwahati India School of Pharmacy Faculty of Medicine The Chinese University of Hong Kong Shatin New Territories Hong Kong

Microchannel-based gas-liquid Taylor flow has been increasingly used in various cutting-edge applications due to its outstanding flow mixing and heat transfer performance. Previous simulations have been limited to the discussions of flow characteristics under stable flow regimes although several experimental studies have observed the occurrence of fluctuated Taylor bubble tails at relatively higher Reynolds numbers. This study has developed a numerical approach to simulate three-dimensional transient Taylor flow and heat transfer with large bubble tail oscillations. A two-stage modelling procedure combining both fixed and moving frame of reference systems has been adopted to ensure a fully-developed flow is obtained. Simulation results of a water-nitrogen system have been compared with experiments and correlation-predicted results, and good agreements have been achieved. A transient oscillation of the bubble tail has been found to occur as the Reynolds number is greater than 700, approximately, and the fluctuation has been more pronounced as the Reynolds number increases further. The above transient effect has been found to be closely related to the enhanced jet flow which originates from the thin liquid film and later merges into the downstream liquid slug, promoting both small and large-scales flow mixing, enhancing heat transfer up to four times of that for a pure liquid flow. A correlation which includes the Capillary and Weber numbers has been proposed to better predict the Taylor flow liquid film thickness. © 2023, The Authors. All rights reserved.

关键词： Microchannels

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Lifetime improvement of digital microfluidic biochips based on the improved whale optimization algorithm for protein analysis instrument system

Lifetime improvement of digital microfluidic biochips based ...

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2020 IEEE International Instrumentation and Measurement technology Conference, I2MTC 2020

作者： Shi, Jinlong Fu, Ping Zheng, Wenbin Yin, Hongtao Jiaqing, Qiao Liu, Bing Harbin Institute of Technology School of Electronics and Information Engineering Harbin150080 China Department of Automatic Test and Control Harbin Institute of Technology Heilongjiang Harbin China

ISBN: (纸本)9781728144603

Digital micro-fluidic biochips (DMFBs) are revolutionizing laboratory procedures for point-of-care clinical diagnostics, environmental monitoring, and protein analysis. Those procedures require high precision of the output for every operation so it need to ensure the chip reliability and the chip lifetime. Because the electrodes on the chip may be reused at different experimental stages, a degraded electrode may be reused for many times. So the lifetime of the chips is closely related to the total actuating time of an electrode. Thus, the electrode total actuating time needs to be considered carefully in an efficient DMFBs design process. This paper proposed an improved whale optimization algorithm (IWOA), which can reduce excessive use of an electrode and reuse electrodes in average manner to optimal the longest lifetime of DMFBs during the design process. Firstly, the position mass of individual whales was improved to solve the problem that the data, calculated by the WOA, cannot be directly used to represent the sequence of operations. Secondly, the inertial weight was added to enhance the local search ability of WOA. The simulation experimental results showed that this algorithm was able to solve lifetime optimization problems. The maximum electrode time used was reduced by 10% to 20%. The performance of efficiency and convergence of algorithm were very good. © 2020 IEEE.

关键词： Electrodes

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