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Selection of Spectral Data for Classification of Steels Using Laser-Induced Breakdown Spectroscopy

Plasma Science and Technology 2015年第11期17卷 964-970页

作者：孔海洋孙兰香胡静涛辛勇丛智博 Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences CAS Key Laboratory of Networked Control System

Principal component analysis （PCA） combined with artificial neural networks was used to classify the spectra of 27 steel samples acquired using laser-induced breakdown spectroscopy. Three methods of spectral data selection, selecting all the peak lines of the spectra, selecting intensive spectral partitions and the whole spectra, were utilized to compare the infiuence of different inputs of PCA on the classification of steels. Three intensive partitions were selected based on experience and prior knowledge to compare the classification, as the partitions can obtain the best results compared to all peak lines and the whole spectra. We also used two test data sets, mean spectra after being averaged and raw spectra without any pretreatment, to verify the results of the classification. The results of this comprehensive comparison show that a back propagation network trained using the principal components of appropriate, carefully selecred spectral partitions can obtain the best results accuracy can be achieved using the intensive spectral A perfect result with 100% classification partitions ranging of 357-367 nm.

关键词： laser-induced breakdown spectroscopy classification of steel samples principal component analysis artificial neural networks selection of spectral data

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Minimizing Data Collection Latency for Coexisting Time-Critical Wireless Networks with Tree Topologies

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IEEE Transactions on Network and Service Management 2025年

作者： Zhang, Jialin Liang, Wei Yang, Bo Shi, Huaguang Liang, Ying-Chang Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang Institute of Automation Shenyang110016 China Chinese Academy of Sciences Key Laboratory of Networked Control System Shenyang Institute of Automation Shenyang110016 China Northwest A and F University College of Information Engineering Yangling712100 China Henan University School of Artificial Intelligence Zhengzhou450046 China University of Electronic Science and Technology of China Center for Intelligent Networking and Communications Chengdu611731 China

Time-Critical Wireless Network (TCWN) is a promising communication technology that can satisfy the low latency, high reliability, and deterministic requirements of mission-critical applications. Multiple TCWNs required by various applications inevitably coexist with each other. Most existing works aim to achieve acceptable latency or consider the simplest topology (i.e., line topology). As latency requirements become more stringent, exploring the minimum data collection latency becomes an interesting problem. In this paper, the coexisting system consists of multiple tree-topology-based TCWNs. We first establish a conversion framework to convert an arbitrary tree topology into multiple analogous line topologies to reduce the analysis complexity. We then propose a Time-Critical wireless network Scheduling (TCS) algorithm to minimize the data collection latency of coexisting TCWNs. The TCS algorithm consists of two phases. In the internetwork scheduling phase, we strictly derive a general expression to characterize the practical network requirements. In the intranetwork scheduling phase, we design two levels of priority assignment algorithms to accurately characterize the critical states and resource requirements of different nodes. We conduct extensive simulations to verify the effectiveness of the TCS algorithm. The evaluation results show that the TCS algorithm can achieve minimum data collection latency in more than 99.956% cases, and the maximum difference compared to the optimal value is one time slot. © 2004-2012 IEEE.

关键词： Scheduling algorithms

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Practical Applicability of PLA for Industrial Wireless Networks: Gaps and Directions

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IEEE Network 2025年

作者： Liang, Wei Wei, Fuyou Wang, Qi Zhan, Ming Wang, Ke Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang Institute of Automation Shenyang110016 China Chinese Academy of Sciences Key Laboratory of Networked Control System Shenyang Institute of Automation Shenyang110016 China Chinese Academy of Sciences Institutes for Robotics and Intelligent Manufacturing Shenyang110169 China University of Chinese Academy of Sciences Beijing100049 China Shandong Normal University Jinan250014 China Taizhou University School of Electronics and Information Engineering Zhejiang Taizhou China

The rapid transformation of Industrial Cyber-Physical system (ICPS) has introduced significant cyber security challenges, particularly in the context of ICPS. Wireless networks are a critical component of these systems, but their open nature makes them vulnerable to security threats. Physical Layer Authentication (PLA) algorithms based on Channel State Information (CSI) are essential complements to existing security technologies in wireless networks. However, their practical application faces challenges such as restricted sampling rates and uneven sampling interval, which result in low-precision CSI, significant random phase offsets, and signal distortion. This study aims to explore the feasibility of deploying and applying existing representative algorithms on industrial wireless commercial devices. According to characteristics of authentication algorithms and the adopted authentication features, we selected five of the latest physical layer authentication algorithms including supervised, semi-supervised, and unsupervised algorithms and deployed them on commercial devices that comply with the WIA-FA standard. We conducted systematic experiments focusing on the motion parameters of devices, the CSI data sampling frequency, the interference caused by worker movement, the surface materials of the devices, and the types of attacks. This study explores the ability of these algorithms to resist attacks and environmental interference in commercial devices and industrial scenarios. Extensive experimental data were collected, and the results indicate that existing authentication algorithms still need improvement to meet the requirements of industrial applications. The experiment findings and the summarized application challenges of these algorithms provide significant guidance for future research and practical industrial implementations. © 1986-2012 IEEE.

关键词： Authentication

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Holocene Fire Dynamics in the Altai Mountains and Its Driving Factors

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Geophysical Research Letters 2025年第9期52卷

作者： Hu, Yu Huang, Xiaozhong Li, Yuan Chen, Hongming Demberel, Otgonbayar Zhang, Jun Xiang, Lixiong Wang, Ling Mu, Xiaoyan Ren, Xiuxiu Zhang, Jiawu Qiang, Mingrui Xiao, Jule College of Earth and Environmental Sciences Lanzhou University Lanzhou China Yunnan Key Laboratory of Plateau Geographical Processes and Environmental Changes Faculty of Geography Yunnan Normal University Kunming China Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou China Khovd Branch School National University of Mongolia Khovd Mongolia Sichuan Provincial Engineering Laboratory of Monitoring and Control for Soil Erosion in Dry Valleys School of Geographical Sciences China West Normal University Nanchong China Key Laboratory of Mongolian Plateau's Climate System at Universities of Inner Mongolia Autonomous Region College of Geographical Sciences Inner Mongolia Normal University Hohhot China School of Geography South China Normal University Guangzhou China CAS Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Fire activity reshapes the successions of forest and steppe ecosystems. However, the long-term fire history and its driving factors in the Altai Mountains remain poorly documented and understood. In this study, we explore the Holocene fire history and its influencing factors, based on different sizes and morphologies of charcoals in a sediment core from Tolbo Lake in the Altai Mountains. On a millennial-scale, fire activity was primarily regulated by moisture-driven biomass availability. After ∼6000 BP, increased precipitation led to higher biomass and enhanced fire activity, with potentially higher human activities contribution. At a centennial-scale, lower fire frequency corresponded to cold climate events in this study. Ongoing global warming may increase the risk of fires in the Altai region. © 2025. The Author(s).

关键词： Global warming

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The design of transformer on-line monitoring system based on DSP 2nd

The design of transformer on-line monitoring system based on...

引用

2nd International Conference on Energy Science and Applied Technology, ESAT 2015

作者： Ding, Tengfei Yin, Chunyuan Cao, Yunxia Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China University of Chinese Academy of Sciences Beijing China Key Laboratory of Networked Control System CAS Shenyang China Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Key Laboratory of Networked Control System CAS Shenyang China

ISBN: (纸本)9781138028333

The security of the power transformer operation directly affects the whole power system. Thus, this paper aims to design the system for "real-time" monitoring the parameters of the transformer based on the TMS320F28335 DSP designed by TI Company. First, the system makes use of different sensors’ signal acquisition. Then, the inconsistent analog signal can be converted into the standard signal for AD conversion through the analog signal photoelectric isolation amplifier. Finally, the DSP will process them, and the processed data will be transferred to the host computer for storage and display. The test results show that the system can monitor the equipment running status accurately, stably and timely. © 2016 Taylor & Francis Group, London.

关键词： Power transformers

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Tailoring intermetallics via cellular boundary enables strong yet ductile property: An example in Gd-enriched neutron shielding alloys

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Scripta Materialia 2025年 265卷

作者： Hou, Kunlei He, Suyun Wei, Boxin Cui, Luqing Zang, Yihu Zhao, Peng Liang, Tian Ma, Guangcai Ma, Yingche Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and Engineering Hebei University of Technology Tianjin300401 China National Key Lab of Aerospace Power System and Plasma Technology Xi'an Jiaotong University Xi'an710049 China School of Mechanical Engineering Xi'an Jiaotong University Xi'an710049 China Department of Physics and Astronomy University of California Irvine IrvineCA92697 United States

Gd is a highly effective element for neutron shielding, but its minimal solubility promotes Gd-rich intermetallics that degrade alloy properties if not properly controlled. This study introduces an innovative approach to refine these intermetallics to a sub-micron scale and achieve a uniform distribution by leveraging the cellular boundaries formed during laser powder bed fusion. These cellular boundaries, combined with the tailored intermetallics, act as "modulators" that effectively impede plastic deformation while permitting dislocation motion, resulting in a satisfying strength-ductility synergy. The findings offer a promising direction for incorporating elements with low solubility but functional properties by tailoring intermetallics through cellular boundary engineering. © 2025 The Author(s)

关键词： Intermetallics

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A method of laser focusing control in microlaser-induced breakdown spectroscopy

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Plasma Science and Technology 2019年第3期21卷 31-39页

作者： Wei WANG Lanxiang SUN Peng ZHANG Liming ZHENG Lifeng QI Wei DONG Shenyang Institute of Automation Chinese Academy of Sciences Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Networked Control System Chinese Academy of Sciences

This paper presents a method for the automatic adjustment of the laser defocusing amount in micro-laser-induced breakdown spectroscopy. A microscopic optical imaging system consisting of a CCD camera and a 20× objective lens was adopted to realize the method. The real-time auto-focusing of the system was achieved by detecting the effective pixels of the light spot generated by the laser pointer. The focusing accuracy of the method could achieve 3 μm. The element concentrations of Mn and Ni in low-alloy steels were analyzed at a crater diameter of about 35 μm using the presented method. After using the presented method, the determination coefficients of Mn and Ni both exceeded 0.997, with the root-mean-square errors being 0.0133 and 0.0395, respectively. Scanning analysis was performed on the inclined plane and the curved surface by means of focusing control and non-focusing control. Ten characteristic spectral lines of Fe were selected as the analysis lines. With the focusing control, the average relative standard deviations obtained on the inclined plane and curved surface were both less than 5%, and much less than the values without focusing control, 14.6% and 40.39%.

关键词： LIBS microanalysis ablation crater focusing control

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Longitudinal Dynamic Characteristics Analysis for controller Design of Elastic Missile 34

Longitudinal Dynamic Characteristics Analysis for Controller...

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第三十四届中国控制会议

作者： XU Zhaoqing PEI Hailong College of Automation Science and Engineering Ministerial Key Laboratory of Autonomous System and Networked ControlSouth China University of Technology

ISBN: (纸本)9781467374439

In order to design the controller of cruise missile vibrating in flight, the longitudinal dynamic characteristics of the missile are analyzed in this paper. The intrinsic mode is calculated by using the software NASTRAN. The additional unsteady aerodynamics caused by vibration is investigated, and the longitudinal rigid perturbation motion equations are established according to the linear theory. The dynamic response of elastic vibration can be obtained after the additional unsteady aerodynamics loads are substituted to the equations as input of disturbance. The results can provide initial data for stability analysis, precision analysis, guidance and control system design. The output response shows that the longitudinal attitude variation caused by elastic vibration will be very small when the aerodynamic and structure stability are satisfied, and the elastic vibration will not influence flight stability, the adverse effects of vibration must be eliminated by the way of filtering or the other methods.

关键词： elastic missile controller unsteady aerodynamics dynamic characteristics

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Dynamic Characteristics Analysis of Cruise Missile controlled by Grid Fin 28

Dynamic Characteristics Analysis of Cruise Missile Controlle...

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第28届中国控制与决策会议

作者： XU Zhaoqing Pei Hailong College of Automation Science and Engineering Key Laboratory of Autonomous System and Networked ControlMinistry of EducationSouth China University of Technology

ISBN: (纸本)9781467397155

The dynamic characteristics of certain cruise missile which is controlled by grid fin is analyzed in this *** aerodynamic force of grid fin is analyzed when the grid fin rotates in flying,then the aerodynamic force and aerodynamic moment along with movement equations are linearized based on the small perturbation linear theory,the beginning state of the cruise is chosen as the feature point,and then the dynamical coefficient are calculated,then the longitudinal and lateral perturbation equations are *** dynamic responses of each motion deviation under the longitudinal and lateral free disturbance are obtained through solving the perturbation *** transfer functions and the dynamic responses under the step deflection of grid fin are *** results indicate that the grid fin can provide favorable stability,the maneuverability of Bank-to-turn is much larger than Skid-to-turn..

关键词： cruise missile grid fin dynamic characteristics dynamic response

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A branch convergence approach to distributed dynamic service composition

A branch convergence approach to distributed dynamic service...

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International Conference on Advanced Computer Theory and Engineering

作者： Ma, Lin Zhu, Ming Wang, Lei Department of Electronic Engineering and Information Science Key Laboratory of Network Communication System and Control CAS Hefei China Department of Automation Key Laboratory of Network Communication System and Control CAS Hefei China

ISBN: (纸本)9781424465408

Web Service composition is a very promising way to generate new services on service oriented architecture (SOA). It will come across subsequent branch convergence problem when implementing parallel process in the distributed environment, which is some parallel branches can't converge at one executive node. In this paper, we introduce a Branch Convergence Approach based on Common Node (BCACN) to solve this problem. A common node which is chosen before branches converging, make a decision to choose a convergent node, such that all subsequent branches can merge into an executive node. Experimental studies demonstrate the effectiveness of the proposed approach. © 2010 IEEE.

关键词： Information services

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