检索结果-内蒙古大学图书馆

TEMPO: Time-evolving multi-period observational anomaly detection method for space probes

Chinese Journal of Aeronautics 2025年

作者： QIAO, Yiqun WANG, Tian LÜ, Jinhu LIU, Kexin School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Institute of Artificial Intelligence Beihang University Beijing100191 China Zhongguancun Laboratory Beijing100098 China State Key Laboratory of Complex & Critical Software Environment Beihang University Beijing100191 China

In space probes, anomaly detection of sequence data collected by various sensors is essential to help detect potential faults promptly, improve the reliability of equipment operation, and ensure the smooth operation of the mission. However, sensors’ signals often contain a superposition of various frequencies, changing fluctuations, and correlations between features. This complexity of data attributes makes building effective models challenging. This paper proposes a Time-Evolving Multi-Period Observational (TEMPO) anomaly detection method for space probes. First, fusing wavelet analysis and natural periods improves the ability to capture multi-period features in data. Then, the feature extraction framework proposed enhances the effectiveness of anomaly detection by comprehensively extracting the complex features of data through the multi-module synergy of temporal and channel. The results demonstrate that the proposed method enhances anomaly detection accuracy and its effectiveness is confirmed. Additionally, the ablation experiment results further validate the efficacy of each module. An evaluation of the algorithm's computational complexity confirms its suitability for real-time processing. © 2025 The Authors

关键词： Space probes

来源：评论

学校读者我要写书评

暂无评论

Virtual Contraction Approach to Decentralized Adaptive Stabilization of Nonlinear Time-Delayed Networks

arXiv

引用

arXiv 2025年

作者： Kawano, Yu Sun, Zhiyong Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8527 Japan State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science College of Engineering Peking University Beijing100871 China

In this paper, we utilize a diagonally dominant structure for the decentralized stabilization of unknown nonlinear time-delayed networks. Generalizing the idea of virtual contraction analysis to time-delayed systems, we demonstrate that nonlinear time-delayed networks can be stabilized by diagonal high-gains if the input matrices possess certain generalized (column/row) diagonally dominant properties. To achieve stabilization of unknown networks, we further propose a distributed adaptive tuning rule for each individual gain function, ensuring that all closed-loop trajectories converge to the origin. The effectiveness of the proposed decentralized adaptive control is verified in a case study on epidemic spreading control in SIS networks with transmission delays. © 2025, CC BY-NC-ND.

关键词： Electric delay lines

来源：评论

学校读者我要写书评

暂无评论

A port-Hamiltonian framework for displacement-based and rigid formation tracking

引用

Automatica 2025年 177卷

作者： Li, Ningbo Sun, Zhiyong van der Schaft, Arjan Scherpen, Jacquelien M.A. China Aerodynamics Research and Development Center Mianyang621000 China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science College of Engineering Peking University Beijing100871 China Jan C. Willems Center for Systems and Control University of Groningen Groningen9747 AG Netherlands

This paper proposes a passivity-based port-Hamiltonian (pH) framework for multi-agent displacement-based and rigid formation control and velocity tracking. The control law consists of two parts, where the internal feedback is to track the velocity and the external feedback is to achieve formation stabilization by steering variables of neighboring agents that prescribe the desired geometric shape. Regarding the external feedback, a general framework is proposed for stabilizing different kinds of formations (including displacement-based, distance-based, angle-based, bearing-based and heterogeneous formations) by means of the advantage that the pH model is energy-based and coordinate-free. To solve the issue that the incidence matrix is not of full column rank over cyclic graphs, the graph matrix property is used to prove the convergence to the target sets for the displacement-based formation, while for rigid formations, the algebraic conditions of infinitesimal rigidity are investigated to achieve local asymptotic stability. Furthermore, the rigid formation with heterogeneous constraints is further investigated under this framework and the local asymptotic stability is proved under a mild assumption. Simulations are performed to illustrate the effectiveness of the framework. © 2025 The Author(s)

关键词： Hamiltonians

来源：评论

学校读者我要写书评

暂无评论

Federated Services: A Smart Service Ecology with Federated Security for Aligned Data Supply and Scenario-Oriented Demands

引用

IEEE/CAA Journal of Automatica Sinica 2025年第5期12卷 925-936页

作者： Xiaofeng Jia Juanjuan Li Shouwen Wang Hongwei Qi Fei-Yue Wang Rui Qin Min Zhang Xiaolong Liang Beijing Big Data Centre Beijing China State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Chinese Academy of Sciences Beijing China Faculty of Innovation Engineering Macau University of Science and Technology Macao China Datatang (Beijing) Technology Company Ltd. Beijing China State Key Laboratory for Management and Control of Complex Systems Chinese Academy of Sciences Beijing China

This paper introduces federated services as a smart service ecology with federated security to align distributed data supply with diversified service demands spanning digital and societal contexts. It presents the comprehensive researches on the theoretical foundation and technical system of federated services, aiming at advancing our understanding and implementation of this novel service paradigm. First, a thorough examination of the characteristics of federated security within federated services is conducted. Then, a five-layer technical framework is formulated under a decentralized intelligent architecture, ensuring secure, agile, and adaptable service provision. On this basis, the operational mechanisms underlying data federation and service confederation is analyzed, with emphasis on the smart supply-demand matching model. Furthermore, a scenario-oriented taxonomy of federated services accompanied by illustrative examples is proposed. Our work offers actionable insights and roadmap for realizing and advancing federated services, contributing to the refinement and wider adoption of this transformative service paradigm in the digital era.

关键词： Adaptation models Biological system modeling Large language models Taxonomy Smart contracts Distributed databases Ecology Data models Security Research and development

来源：评论

学校读者我要写书评

暂无评论

A semi-analytical method for determining homogenized relaxation times and moduli in Prony series of a heterogeneous viscoelastic material

引用

European Journal of Mechanics, A/Solids 2025年 113卷

作者： Jia, Huilin Yuan, Zifeng Department of Mechanics and Engineering Science Peking University Beijing100871 China State Key Laboratory for Turbulence and Complex Systems Peking University Beijing100871 China Peking University Nanchang Innovation Institute Nanchang330000 China

This work introduces a semi-analytical method to obtain homogenized relaxation times and moduli in terms of Prony series of a heterogeneous viscoelastic material. This can be treated as an extension of linear homogenization theory which calculates homogenized elastic properties of a heterogeneous elastic material. The heterogeneous viscoelastic material is consist of multiple phases where each phase is assumed as a standard-solid viscoelastic material. The idea of so-called reduced-order-homogenization method is introduced to propose a set of residual-free governing equations with respect to the averaged strains and eigenstrains of all the phases. The set of governing equations can be rewritten as a set of ordinary differential equations (ODEs), which can be solved analytically to obtain relationship between the phase strains and the macroscopic strains. The solution of the ODEs stems from an eigenvalue problem, where the eigenvalues are the homogenized relaxation times. In addition, the relaxation moduli can be evaluated through the ODEs as well. Accordingly, a homogenized viscoelastic material in term of Prony series can be determined. Four sets of numerical tests are proposed to verify the semi-analytical method: unit cell tests, tension tests on a plate with a hole, pure bending tests, and torsion tests. The results from these tests demonstrate a strong agreement between the homogenized model and direct numerical simulations. Additionally, we compared our model against experimental measurements, further confirming the accuracy and reliability of our proposed approach. © 2025 Elsevier Masson SAS

关键词： Ordinary differential equations

来源：评论

学校读者我要写书评

暂无评论

Target Defense with Multiple Defenders and an Agile Attacker via Residual Policy Learning

arXiv

引用

arXiv 2025年

作者： Tao, Jiyue Shen, Tongsheng Zhao, Dexin Zhang, Feitian Robotics and Control Laboratory Department of Advanced Manufacturing and Robotics College of Engineering and the State Key Laboratory of Turbulence and Complex Systems Peking University Beijing100871 China National Innovation Institute of Defense Technology Beijing100071 China

The target defense problem involves intercepting an attacker before it reaches a designated target region using one or more defenders. This letter focuses on a particularly challenging scenario in which the attacker is more agile than the defenders, significantly increasing the difficulty of effective interception. To address this challenge, we propose a novel residual policy framework that integrates deep reinforcement learning (DRL) with the force-based Boids model. In this framework, the Boids model serves as a baseline policy, while DRL learns a residual policy to refine and optimize the defenders’ actions. Simulation experiments demonstrate that the proposed method consistently outperforms traditional interception policies, whether learned via vanilla DRL or fine-tuned from force-based methods. Moreover, the learned policy exhibits strong scalability and adaptability, effectively handling scenarios with varying numbers of defenders and attackers with different agility levels. Copyright © 2025, The Authors. All rights reserved.

关键词： Adversarial machine learning

来源：评论

学校读者我要写书评

暂无评论

The physics of citation growth

引用

Journal of Data and Information Science 2025年第1期10卷 132-150页

作者： Alan J.Giacomin Martin Zatloukal Mona A.Kanso Nhan Phan-Thien Mechanical Engineering Department University of NevadaRenoNevada 89557-0312USA State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing 100871China Department of Polymer Engineering Faculty of TechnologyTomas Bata University in ZlínVavrečkova 566976001 ZlínCzech Republic Chemical Engineering Department Massachusetts Institute of TechnologyCambridge 02139USA State Key Laboratory of Fluid Power and Mechatronic Systems and Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China

Purpose:This study investigates the physics of annual fractional citation growth and its impact on journal bibliographic metrics,focusing on the interplay between journal publication growth and citation ***/methodology/approach:We analyze bibliometric data from three prominent fluids journals-Physics of Fluids,Journal of Fluid Mechanics,and Physical Review Fluids-over the period *** analysis examines the relations among annual fractional journal publication growth,citation growth,and bibliographic metric ***:Our findings reveal that the suppression of impact factor growth is significantly influenced by annual fractional journal publication growth rather than citation *** three journals exhibit similar responses to publication growth with minimal scatter,following a consistent functional *** also identify narrow,nearly Gaussian distributions for annual fractional journal publication ***,we introduce a new growth-independent dimensionless bibliometric metric,journal urgency,the ratio of annual fractional citation growth to the 4-year running average immediacy *** metric captures effectively the dependency of citation growth on urgency and reveals consistent distributions across the journals *** limitations:The study is limited to three major fluids journals and to the availability of bibliometric data from 1999 to *** work could extend the analysis to other disciplines and *** implications:Understanding the relation between publication growth and bibliometric suppressions can inform editorial and strategic decisions in journal *** proposed journal urgency metric offers a novel tool for assessing and comparing journal performance independent of growth ***/value:This study introduces a new bibliometric metric-journal urgency-that provides fresh insights into citation dynamics and bibliographic metric *** highlights the critic

关键词： Impact factor CiteScore Journal publication growth Journal citation growth

来源：评论

学校读者我要写书评

暂无评论

PATCH: Empowering Large Language Model with Programmer-Intent Guidance and Collaborative-Behavior Simulation for Automatic Bug Fixing

arXiv

引用

arXiv 2025年

作者： Zhang, Yuwei Jin, Zhi Xing, Ying Li, Ge Liu, Fang Zhu, Jiaxin Dou, Wensheng Wei, Jun Affiliated with Nanjing Institute of Software Technology University of Chinese Academy of Sciences Nanjing China Key Laboratory of System Software Chinese Academy of Sciences Institute of Software Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing China Key Laboratory of High Confidence Software Technologies Peking University Ministry of Education School of Computer Science Peking University Beijing China School of Computer Science Wuhan University Wuhan China School of Intelligent Engineering and Automation Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Complex & Critical Software Environment School of Computer Science and Engineering Beihang University Beijing China

Bug fixing holds significant importance in software development and maintenance. Recent research has made substantial strides in exploring the potential of large language models (LLMs) for automatically resolving software bugs. However, a noticeable gap in existing approaches lies in the oversight of collaborative facets intrinsic to bug resolution, treating the process as a single-stage endeavor. Moreover, most approaches solely take the buggy code snippet as input for LLMs during the patch generation stage. To mitigate the aforementioned limitations, we introduce a novel stage-wise framework named PATCH. Specifically, we first augment the buggy code snippet with corresponding dependence context and intent information to better guide LLMs in generating the correct candidate patches. Additionally, by taking inspiration from bug management practices, we decompose the bug-fixing task into four distinct stages: bug reporting, bug diagnosis, patch generation, and patch verification. These stages are performed interactively by LLMs, aiming to simulate the collaborative behavior of programmers during the resolution of software bugs. By harnessing these collective contributions, PATCH effectively enhances the bug-fixing capability of LLMs. We implement PATCH by employing the powerful dialogue-based LLM ChatGPT. Our evaluation on the widely used bug-fixing benchmark BFP demonstrates that PATCH has achieved better performance than state-of-the-art LLMs. Copyright © 2025, The Authors. All rights reserved.

关键词： Computer software maintenance

来源：评论

学校读者我要写书评

暂无评论

Multi-Level Features Fusion for Zero-Shot Object Pose Estimation

Multi-Level Features Fusion for Zero-Shot Object Pose Estima...

引用

26th International Conference on Industrial Technology, ICIT 2025

作者： Huang, Nanxin Xu, Chi School of Automation China University of Geosciences Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Wuhan China

ISBN: (纸本)9798331521950

Driven by advancements in industrial production and artificial intelligence, the need for pose estimation of new ob-jects in areas like robotic manipulation and virtual reality is increasing. We introduce a zero-shot object pose estimation approach that identifies the poses of objects excluded from the training dataset, removing the requirement for re-modeling. The method is built around a multi-level features fusion framework de-signed to enhance generalization. First, a trainable feature extraction module filters and selects multi-level features extracted by the backbone network. Unlike traditional convolutional ker-nels, we incorporate a dynamic convolution kernel to enhance the feature extraction capability. Second, in the feature fusion module, we adopt a dynamic weight generation strategy to perform weighted fusion of multi-level features. This method enhances template matching by effectively describing similarities between unseen objects (those absent from the training set) and templates, leveraging robust and adaptive feature representations to narrow the gap with seen objects. Experimental results demonstrate that our approach achieves state-of-the-art performance on two popu-lar benchmark datasets, LineMod and LineMod-Occlusion, proves that our method has better generalization than previous models. © 2025 IEEE.

关键词： fea-tures fusion object pose estimation templates matching unseen object zero-shot

来源：评论

学校读者我要写书评

暂无评论

Visual Sensor-Based Trajectory Multimodality Prediction via Anchor-Free Query Attention Network

引用

IEEE Transactions on Instrumentation and Measurement 2025年 74卷

作者： Wang, Ruiping Cheng, Jun Yu, Junzhi Nanyang Technological University School of Computer Science and Engineering Jurong West Singapore639798 Singapore Peking University College of Engineering Beijing100871 China Peking University State Key Laboratory for Turbulence and Complex Systems Department of Advanced Manufacturing and Robotics College of Engineering Beijing100871 China

As a core component of intelligent surveillance and autonomous driving systems, visual sensor-based trajectory multimodality prediction can significantly improve their perception and decision-making capabilities. Numerous existing trajectory prediction methods are dedicated to enhance prediction performance. However, they still fail to effectively model the complex spatiotemporal interactions among pedestrians and trajectory multimodality. To address the above challenges, this article presents one new trajectory multimodality prediction method via anchor-free query-based attention network, which can more effectively capture spatiotemporal interactions and model trajectory multimodality. First, the initial trajectory proposal module employs target-centered query-based attention to capture complex spatiotemporal interactions and generate multiple trajectory proposals corresponding to the multiple modes of the future trajectory, which allows the model to use different interaction information when decoding trajectory points at different time steps. Second, the novel trajectory refinement module utilizes the learnable trajectory proposals to construct proposal-level interaction mechanisms to refine future trajectories. Experimental results conducted on ETH and UCY datasets demonstrate that the proposed model can provide the state-of-the-art prediction performance. © 1963-2012 IEEE.

关键词： Prediction models

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：