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A survey on radio frequency fingerprint signal analysis and intelligent identification
YAN Gaoli;FU Xue;WANG Yu;GUI GuanIn the context of next-generation wireless communications and multi-source heterogeneous network systems, traditional cryptographic mechanisms and security protocols pose significant risks in Internet of things(IoT) environments. There is an urgent demand for more efficient and reliable identity authentication technologies. Radio frequency fingerprinting identification(RFFI), which leverages the inherent signal characteristics of wireless devices, provides a novel approach to addressing device authentication and security challenges. Unlike existing reviews that focus on selected aspects of RFFI from a broad perspective, this paper proposes a systematic and comprehensive framework.It begins by explaining the fundamental principles and characteristics of radio frequency fingerprint(RFF). Then, from the perspectives of statistical features and deep learning(DL)-based features, the paper presents an in-depth review of RFFI classification and identification methods, along with a comparative analysis of the two approaches supported by experimental validation. Finally, several potential research directions in intelligent RFFI are discussed, and future trends of RFF technology are explored, aiming to offer both theoretical insights and practical guidance for ongoing research and real-world applications.
Design of Hydraulic Control System for Injection Molding Machine Based on PLC
LI Qing-hong,WU Long(School of Physics and Mechanical & Electrical Engineering,Sanming University,Sanming 365000,China)The working principle about hydraulic system of injection molding machine and the working requirement are introduced,then the electrical control system including hardware and program based on the PLC is designed.The programming way of Start-Retention-Stop Electric Circuit to modular programming is employed.After drawing sequential function chart,modularized programming is achieved by using PLC programming components,therefore the program is concise,simple debugging,easy to modify,and has strong versatility,which is suitable for any type of PLC.The finding shows that:the modified electrical control system can greatly improve the production precision,working performance,maintenance and stability of injection molding machine,improve the quality and production efficiency of the products.
Review on the Mechanism of Metal Surface Plasmon Resonance Enhanced Photocatalysis of Semiconductor Nanomaterials
FANG Ming;TAN Xiaoli;MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University;The metal surface plasmon enhanced photocatalysis has recently aroused great concern. Many researchers have devoted in the related research and achieved great progress in physics, chemistry and materials, etc. This paper reviewed the recent research on the surface plasmon enhanced photocatalysis, including the effects of Schottky barrier, hot electrons injection and energy resonance processes. The effect of Ag, Au and Bi metal on enhancing the photocatalysis has been analyzed, and the common mechanism of the surface plasmon resonance energy transfer at the interface between the metal and semiconductor were summarized. The recent development of noble metal on the photocatalysis of multiple-component semiconductors is also reviewed. In conclusion, the metal enhanced photocatalysis has been a hot ?eld in the research of material fabrication and design, which plays important role in human and society development such also organic oxidation/reduction, heavy metal reduction, hydrogen production from water and carbon dioxide photocatalysis.
Application status and development trend of fiber-based flexible sensors
FAN Songbai;LIAO Wenyi;WU Yuting;PAN Zhijuan;As flexible devices based on fiber materials, fiber-based flexible sensors not only exhibit the flexibility of textiles but also possess functions for signal perception and processing. Due to their structural diversity and composable design advantages, these sensors have attracted significant attention from researchers and hold broad development prospects in fields such as smart clothing, medical health, human-machine interaction, and robotic tactile sensing. This paper reviews recent research achievements in fiber-based flexible sensors, summarizing their application status across five major areas: force sensing, gas sensing, temperature sensing, humidity sensing, and biosensing. The structural design strategies, performance improvement approaches, and preparation methods for fiber-based flexible sensors, tailored to meet diverse application requirements, are analyzed in detail. Comparisons are made between similar types of sensors from raw material preparation to working mechanisms. Finally, the challenges and opportunities for the future development of fiber-based flexible sensors are summarized and discussed. In the future, with ongoing improvements in sensitivity, resolution, and stability, fiber-based sensors are expected to evolve towards diversified and eco-friendly materials, integrated and intelligent functions, and expanded application fields.
The Virtual Server Computing Cluster in Trend of Cloud Computing
ZHU Jian-xin1,2(1.Southeast University,Nanjing 210018,China;2.Nantong University,Nantong 226019,China)Cloud computing,as a web application framework for the future,is strikingly developed.This paper virtualized computing resources by means of Vmware virtualization approach,cutting the hardware computing and storage capacity.The rational allocation of resources based on virtual hardware on the server LVS cluster helped realize the high-availability and load balancing of cloud computing.Besides offering traditional services such as web and ftp,the cluster can provide the operating system rental service with full authority.
Analysis on Structure and Kinematics of FANUC M-6iB Industrial Robot
ZHANG Xing-guo,XU Hai-li(School of Mechanical Engineering,Nantong University,Nantong 226019,China)After analyzing the system structure,technical parameters and work space of FANUC M-6iB industrial robot,we established the local coordinate system of the FANUC M-6iB robot links based on the D-H transformation matrix.The geometrical parameters of the links and variables of the joints were gained.Moreover,the kinematics equation pro-viding mathematic model for path planning of the robot was ratiocinated.The equation is propitious to utilizing the robot system and promoting teaching and researching.
Study on Yield Improvement of Semiconductor Process Based on Big Data Analysis
LU Jian;YANG Dongqin;HUANG Qianlu;WANG Qiang;ZHAO Suhua;School of Software and Microelectronic, Peking University;Jiangsu Ecnoessenergy Co.Ltd.;School of Electric and Information, Nantong University;Engineering Training Center, Nantong University;Failure analysis technology based on large data analysis is used to study the systematic problem of restricting the yield of advanced integrated circuits. The Explorer Yield analysis software was used to rediagnose the integrated circuit on large scale test results statistical analysis. According to the measurement results of the wafers, the system problem of restricting the yield of wafer was found by analyzing the dice from the outside 5 rings on the wafer edge using automatic diagnosis function of Explorer Yield. Physical failure analysis was performed by selecting the best failure samples. The key failure issue was found. The process was optimized according to the analysis results.And the wafer yield increased by about 2%.
Application of the Elementary Transformation of Matrices to the Elementary Number Theory
CHEN Bi - qin (Chongqing Normal University, Chongqing, 400047, China )This paper first proves two relevant theorems, and then presents a new method to find the greatest common factor of integers and to solve linear indeterminate equation by applying the elementary transfonnadon of matrices.
Application Advances in the Photocatalytic Degradation of Pollutants in Water by MOFs and Its Compounds
WANG Luping;LU Zhanhui;TAN Xiaoli;FANG Ming;Metal organic frameworks(MOFs) is a new type of crystalline porous material, which has the characteristics of high surface area, high porosity and low synthesis cost. MOFs have been widely used in the field of catalysis due to its unique porous structure and discrete active centers. Firstly, the types and synthesis methods of common MOFs are introduced, and the characteristics of different synthesis methods are summarized. Then, the latest research progress of MOFs as photocatalysts for the efficient removal of heavy metals, dyes, and antibiotics in wastewater is reviewed. The photocatalysis of MOFs and composite materials on different pollutants, reaction efficiency, and various experimental conditions are performed. Finally, the prospects and challenges of MOFs as photocatalysis in wastewater treatment are discussed.
Research and Prospect on the Technique for Bolt Axial Stress Measurement
LI Guang,MO Ya-mei,WU Nu(School of Mechanical Engineering,Nantong University,Nantong 226019,China)This paper focuses on the principle and methods of ultrasonic measurement of bolt axial stress.Challenges and new thoughts for research on this technique are also pointed out.A piezoelectricity sensing-typed bolt with a layer of piezoelectric ceramic on its head is made to produce a small portable ultrasonic tester characterized by the system of ultrasonic transmitting and receiving devices,signal acquisition devices and analytical processing.Ultrasonic will be generated after the piezoelectric layer is stimulated by high-voltage pulses from the transmitting device of the tester.The return signal in the bolt will be received,analyzed and processed by receiving device.Meanwhile,the current stress state of the bolt will be reflected on the screen.This approach can avoid some errors caused by coupling layer non-uniformity and achieve high-accuracy control of stress and preload of bolts.