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Adaptive control of track tension estimation using radial basis function neural network

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Defence Technology（防务技术） 2021年第4期17卷 1423-1433页

作者： ping-xin wang Xiao-ting Rui Hai-long Yu guo-ping wang Dong-yang Chen Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjing210094China College of Electrical Energy and Power EngineeringYangzhou UniversityYangzhou225000China

Track tension is a major factor influencing the reliability of a *** order to reduce the risk of track peel-off,it is necessary to keep track tension ***,it is difficult to measure the dynamic tension during off-road *** on the analysis of the relation and external forces depending on free body diagrams of the idler,idler arm,road wheel and road arm,a theoretical estimation model of track tension is *** estimation results with multibody dynamics simulation results,the rationality of track tension monitor is *** the aid of this monitor,a track tension control system is designed,which includes a self-tuning proportional-integral-derivative(PID)controller based on radial basis function neural network,an electro-hydraulic servo system and an idler *** tightness of track can be adjusted by turning the idler *** results of the vehicle starting process indicate that the controller can reach different expected tensions quickly and *** with a traditional PID controller,the proposed controller has a stronger anti-disturbance ability by amending control parameters online.

关键词： Track tension Monitor Multibody dynamics Neural network Anti-disturbance ability

Framed slotted ALOHA with grouping tactic and binary selection for anti-collision in RFID systems

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The Journal of China Universities of Posts and Telecommunications 2009年第4期16卷 47-52页

作者： wang Ya-qi JIANG guo-ping wang Jing Center for Control and Intelligence Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China

In radio frequency identification （RFID） systems, tag collision arbitration is a significant issue for fast tag identification. This article proposes a novel tag anti-collision algorithm called framed slotted ALOHA with grouping tactic and binary selection （GB-FSA）. The novelty of GB-FSA algorithm is that the reader uses binary tree algorithm to identify the tags according to the collided slot counters information. Furthermore, to save slots, tags are randomly divided into several groups based on the number of collided binary bits in the identification codes （IDs） of tags, and then only the number of the first group of tags is estimated. Performance analysis and simulation results show that the GB-FSA algorithm improves the identification efficiency by 9.9%-16.3% compared to other ALOHA-based tag anti-collision algorithms when the number of tags is 1000.

关键词： RFID anti-collision binary tree identification efficiency

Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium

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Light(Science & Applications) 2024年第11期13卷 2794-2801页

作者： Yachao Liu Mingwei wang Yongqing Huang guo ping wang Shuang Zhang State Key Laboratory of Radio Frequency Heterogeneous Integration College of Electronics and Information EngineeringShenzhen UniversityShenzhen 518060China Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China Department of Physics University of Hong KongHong KongChina Department of Electrical&Electronic Engineering University of Hong KongHong KongChina

Propagation properties of electromagnetic waves in an optical medium are mainly determined by the contour of equal-frequency states in *** photonic Weyl media,the topological surface waves lead to a unique open arc of the equal-frequency contour,called the Fermi ***,for most realistic Weyl systems,the shape of Fermi arcs is fixed due to the constant impedance of the surrounding medium,making it difficult to manipulate the surface *** we demonstrate that by adjusting the thickness of the air layer sandwiched between two photonic Weyl media,the shape of the Fermi arc can be continuously changed from convex to ***,we show that the concave Fermi-arc waves can be used to achieve topologically protected electromagnetic pulling forces over a broad range of angles in the air *** finding offers a generally applicable strategy to shape the Fermi arc in photonic Weyl media.

关键词： wave. Fermi topological

A review on image-based rendering

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Virtual Reality & Intelligent Hardware 2019年第1期1卷 39-54页

作者： Yuan CHANG guo-ping wang School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China Beijing Engineering Research Center for Virtual Simulation and Visualization Beijing 100871China

Image-based rendering is important both in the field of computer graphics and computer vision,and it is also widely used in virtual reality *** more than two decades,people have done a lot of work on the research of image-based rendering,and these methods can be divided into two categories according to whether the geometric information of the scene is *** to this classification,we introduce some classical methods and representative methods proposed in recent *** also compare and analyze the basic principles,advantages and disadvantages of different ***,some suggestions are given for research directions on image-based rendering techniques in the future.

关键词： Image-based rendering Virtual reality Image interpolation Panorama

Hilar cholangiocarcinoma: Pathology and tumor biology

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Frontiers of Medicine 2010年第4期4卷 371-377页

作者： Dong KUANG guo-ping wang Institute of Pathology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Hilar cholangiocarcinoma,ﬁrst described by Klatskin in 1965,is a relatively rare tumor arising from the bile *** histomorphological features of hilar cholangiocarcinoma are identical with other extra-and intra-hepatic bile duct *** most common disease associated with cholangiocarcinoma is primary sclerosing *** development of cholangiocar-cinoma is a multistep process associated with several mutations in oncogenes and tumor-suppressor *** on macroscopic appearance,three distinct subtypes have been described:sclerosing,nodular,and ***,more than 95%of tumors are *** cholangiocarcinoma is a slowly growing tumor and tends to spread longitudinally along the bile ducts with neural,perineural,and subepithelial *** node invasion can be found in 30%–50%patients at the time of diagnosis,but blood-born metastases are rare and usually occur at late stages.

关键词： hilar cholangiocarcinoma morphology primary sclerosing cholangitis metastasis growth

All-angle reflectionless negative refraction with ideal photonic Weyl metamaterials

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Light(Science & Applications) 2022年第10期11卷 2444-2450页

作者： Yachao Liu guo ping wang John B.Pendry Shuang Zhang College of Electronics and Information Engineering Shenzhen University518060 ShenzhenChina School of Physics&Astronomy University of BirminghamBirmingham B152TTUK The Blackett Laboratory Department of PhysicsImperial College LondonLondon SW72AZUK Department of Physics University of Hong KongHong KongChina Department of Electrical&Electronic Engineering University of Hong KongHong KongChina

Negative refraction,an unnatural optical phenomenon in which the incident and the refracted waves reside on the same side of the surface normal,has been demonstrated with the invention of negative index media based on artificially engineered photonic structures called *** has received wide attention due to its potential applications in imaging,nonlinear optics,and electromagnetic ***,it is highly challenging to realize negative refraction operating at all angles and with the perfect *** this work,leveraging the recent development in topological photonics,we propose to realize reflection less negative refraction for all incident angles with a topological *** proposed metamaterial possesses two Weyl points of opposite topological *** interfacing the metamaterial with a perfect electric conductor(PEC)or a perfect magnetic conductor(PMC),the Fermi arc connecting the two Weyl points can take the form of a half-circle possessing a positive or a negative refractive ***,due to the topological protection,there is no reflection at the interface between the PEC and PMC covered areas,leading to the observation of all-angle negative refraction without reflection at the *** work provides a new platform for manipulating the propagation of surface waves,which may find applications in the construction of integrated photonic devices.

关键词： refraction topological perfect

An efficient and modular modeling for launch dynamics of tubed rockets on a moving launcher

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Defence Technology（防务技术） 2021年第6期17卷 2011-2026页

作者： Qin-bo Zhou Xiao-ting Rui guo-ping wang Jian-shu Zhang Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjingJiangsu Province210094PR China

This paper develops a modular modeling and efficient formulation of launch dynamics with marching fire(LDMF)using a mixed formulation of the transfer matrix method for multibody systems(MSTMM)and Newton-Euler *** a ground-borne multiple launch rocket systems(MLRS),the focus is on the launching subsystem comprising the rocket,flexible tube,and tube *** launching subsystem is treated as a coupled rigid-flexible multibody system,where the rocket and tube tail are treated as rigid bodies while the flexible tube as a beam with large ***,the tube and tube tail can be elegantly handled by the MSTMM,a computationally efficient order-N ***,the equation of motion of the in-bore rocket with relative kinematics *** tube using the Newton-Euler method is ***,the rocket,tube,and tube tail dynamics are coupled,yielding the equation of motion of the launching subsystem that can be regarded as a building block and further integrated with other *** deduced dynamics equation of the launching subsystem is not limited to ground-borne MLRS but also fits for tanks,self-propelled artilleries,and other air-borne and naval-borne weapons undergoing large *** simulation results of LDMF are given and partially verified by the experiment.

关键词： Launch dynamics Marching fire Transfer matrix method for multibody systems Multiple launch rocket system

Correction to“A Classification of Spectrum-determined Circulant Digraphs”

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Acta Mathematicae Applicatae Sinica 2021年第4期37卷 867-868页

作者： Zheng-xin QIN Xin-ping XU Ji-xiang MENG guo-ping wang School of mathematics and information technology Jiangsu Second Normal UniversityNanjing210013China College of Mathematics and System Sciences Xinjiang UniversityUrumqi830046China School of Mathematical Sciences Xinjiang Normal UniversityUrumqi830054China

We find an error in the proof of Lemma 4 in[3].This makes that Theorem 2 and Corollary 3 in[3]are also wrong,and the next counterexample shows this.

关键词： proof error Digraph

A novel launch dynamics measurement system for multiple launch rocket system and comparative analysis with numerical simulations

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Defence Technology（防务技术） 2021年第2期17卷 671-681页

作者： Li-lin Gu Xiao-ting Rui guo-ping wang Yi An Fu-feng Yang Min Wei Institute of Launch Dynamics Nanjing University of Science and TechnologyNanjing 210094PR China School of Physical and Mathematical Science Nanjing Tech UniversityNanjing 211816PR China

In this paper,a novel launch dynamics measurement system based on the photoelectric sensor pair is *** actual muzzle time(i.e.a time duration that originates from the initial movement to the rocket’s departure from the muzzle)and the muzzle velocity are *** with the classical methods,the actual muzzle time is obtained by eliminating the ignition *** comparative analysis method is proposed with numerical simulations established by the transfer matrix method for multibody *** experiment results indicate that the proposed measurement system can effectively measure the actual muzzle time and reduce the error of classical methods,which match well with the simulation results showing the launch dynamics model is reliable and helpful for further analysis and design of the MLRS.

关键词： Multiple launch rocket system Photoelectric sensor Launch dynamics measurement system Model verification Transfer matrix method for multibody systems