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Analysis of FAST' Best Working Paraboloid 3

Analysis of FAST' Best Working Paraboloid

引用

2022 3rd International Conference on Electrical, Electronic Information and communication engineering, EEICE 2022

作者： Xiao, Haitao Wang, Hanyun Li, Wenzhi Yang, Shanshan Dalian Scientific Test & Control Technology Institute PO Box67 Dalian116013 China School of Communication Engineering Jilin University Changchun130022 China

FAST consists of an active reflector, a signal receiving system (feedback source cabin) and other devices, where the reflector is an adjustable sphere composed of a main cable net, reflective panel, actuator and other main parts. It obtains an ideal paraboloid for operation in line with the position of the heavenly bodies, and meanwhile, a reflective panel regulating model by fitting the paraboloid as much as possible based on this ideal paraboloid, and calculates the absorptance of the cable according to the reflection model of electromagnetic waves. © Published under licence by IOP Publishing Ltd.

关键词： Cables

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Effective Methods to Improve the Accuracy of False Light Source Recognition in Visible Light Indoor Positioning

Effective Methods to Improve the Accuracy of False Light Sou...

引用

International Conference on Indoor Positioning and Indoor Navigation (IPIN)

作者： DeYue Zou LinNa Yan Siyu Gao Yunfeng Liu School of Information and Communication Engineering Dalian University of Technology Dalian China School of Intelligence & Electronic Engineering Dalian Neusoft University of Information Dalian China Beijing Institute of Control and Electronic Technology Dalian China

ISBN: (数字)9798350366402

ISBN: (纸本)9798350366419

With the development of visible light communication technology, visible light indoor positioning technology has become one of the research hotspots in indoor positioning technology. Visible light indoor positioning uses the light source information in the scene to locate the receiving end. However, the indoor environment is complex, and there are likely to be mirrors, glass and other reflective objects. These objects reflect to generate a pseudo-light source that transmits information similar to the actual light source, affecting the positioning result. Aiming at the recognition of pseudo-light sources, this paper adds classification steps to the algorithm based on chiral light source array, and proposes two methods that can improve the accuracy of identifying true and false light sources: K-Nearest Neighbor (KNN) classification and Weighted K-Nearest Neighbor (WKNN) classification and correction. Based on the chiral detection algorithm of vector product, we compare the success rates of the improved methods with the algorithm without the improved methods. The simulation results show that the accuracy of false detection can be further improved by adding the improved method, so as to improve the positioning accuracy.

关键词： Accuracy Simulation Indoor navigation Nearest neighbor methods Vectors Classification algorithms Reliability Mirrors Light sources Visible light communication

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Remotely controllable Data Self-Destruction for Privacy-Preserving Sensitive Data Services 25

Remotely Controllable Data Self-Destruction for Privacy-Pres...

引用

25th IEEE International Conferences on High Performance Computing and communications, 9th International Conference on Data Science and Systems, 21st IEEE International Conference on Smart City and 9th IEEE International Conference on Dependability in Sensor, Cloud and Big Data Systems and Applications, HPCC/DSS/SmartCity/DependSys 2023

作者： Zhou, Chengxin Xue, Xianbin Riad, Khaled Zhu, Yan Chu, William Cheng-Chung School of Computer and Communication Engineering University of Science and Technology Beijing Beijing China North Navigation Control Technology Co. Ltd. Beijing China College of Computer Science and Information Technology King Faisal University Saudi Arabia Tunghai University Department of Computer Science Taichung Taiwan

ISBN: (纸本)9798350330014

This paper address a comprehensive solution to address data privacy and security challenges in data science, providing secure self-destruction of sensitive data, confidentiality through encryption, and flexible control over message destruction. Based on outsourcing cloud data services, we introduce a cloud retrograde storage (CRS) system for privacy-preserving self-destruction of sensitive data. The CRS is based on a frequently colliding hash table and recycle pool, and supports remote time, count, and range control. Hereby, we provide a remotely controllable mechanism for the prompt destruction of inactive messages against digital forensics without reducing the availability of services. The method used in the CRS involves storing messages in a recycle pool, where they are automatically erased at the end of their validity period or after being viewed by all recipients. The system also incorporates encryption and decryption processes to ensure confidentiality. The result of performance evaluation shows that the CRS effectively handles the destruction of messages and provides secure data removal from storage pools. The experiments demonstrate the efficiency and practicality of the CRS for large-scale data services. © 2023 IEEE.

关键词： Sensitive data

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Constant modulus waveform design for radar with Doppler tolerance based on local ambiguity function template matching 5

Constant modulus waveform design for radar with Doppler tole...

引用

5th IEEE International Conference on Electronic Information and communication technology, ICEICT 2022

作者： Zhang, Qian Du, Xiaolin Cui, Guolong Zheng, Jibin Dong, Jun School of Computer and Control Engineering Yantai University Yantai China School of Information and Communication Engineering University of Electronic Science and Technology of China Chengdu China Xidian University National Laboratory of Radar Signal Processing Xi'an China

ISBN: (数字)9781665472111

ISBN: (纸本)9781665472111

To tackle the problem of Doppler sensitivity of phase-coded waveform in radar systems, a method for designing transmit waveform with Doppler tolerance under constant modulus (CM) constraint is considered. In this method, the variance between the ideal local ambiguity function (LAF) and the real one is used as the objective function to establish an optimization problem. To solve the non-convex quartic problem, a template matching sequence optimization (TMSO) algorithm is proposed. By introducing an auxiliary variable and problem transformation, the solution to the original problem can finally be obtained, involving two alternately iterative subproblems with closed-form solutions. Numerical experiments show that, compared with the reference algorithms, the proposed algorithm can not only obtain a transmit waveform with good Doppler tolerance, but also has a significant advantage in the execution efficiency. © 2022 IEEE.

关键词： Template matching

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Fault Prediction Method of Stage Lifts Based on Digital Twin

Fault Prediction Method of Stage Lifts Based on Digital Twin

引用

Culture-Oriented Science and technology (CoST), International Conference on

作者： Huiqin Wang Chunxi Zhang Zhen Li Mengjiao Xiao Ministry of Culture and Tourism Key Laboratory of Acoustic Visual Technology and Intelligent Control System Beijing China School of Information and Communication Engineering Communication University of China Beijing China

ISBN: (数字)9798350380347

ISBN: (纸本)9798350380354

To improve the safety of stage lifts’ operation and reduce the failure rate, a digital-twin assisted fault prediction method is proposed here. Signals such as vibration and temperature are collected from the virtual and physical models. A fault prediction model based on Graph Convolutional Networks (GCN) is constructed to identify the potential faults of stage lift. The experiment results illustrate the effectiveness of the proposed model. It would enhance the safety and stability of stage equipment, and provide reliable support for stage performances.

关键词： Fault diagnosis Vibrations Training Computational modeling Predictive models Stability analysis Real-time systems

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Deep Learning-Based Channel Estimation for HPO-MIMO Systems in IoV Scenario 15

Deep Learning-Based Channel Estimation for HPO-MIMO Systems ...

引用

15th International Congress on Image and Signal Processing, BioMedical engineering and Informatics, CISP-BMEI 2022

作者： Li, Xinru Li, Qingyu Meng, Fanke Xu, Zixin Xu, Zhan Gong, Yi School of Information Communication Engineering and Control Technology Ministry of Education Beijing Information Science and Technology University China Xi an University of Posts and Telecommunications China Tianjin Yinyuan Information Technology CO. Ltd China

ISBN: (数字)9781665488877

ISBN: (纸本)9781665488877

Non-linear MIMO technology is proven to work out the excessive power consumption issue caused by the base station with more than 100 antenna pairs that have been adopted for the Internet of Vehicles (IoV). However, the non-linear MIMO scheme applied in the IoV scenario does not consider the real-world channel with the characteristics of vehicle motion. In addition, traditional channel estimation (CE) in non-linear MIMO technology are not robust under the variation of channel parameters in IoV.A channel estimation scheme of Half Phase Only (HPO)-MIMO based on Convolutional Neural Network (CNN) is proposed, which can get more accurate channel estimation results and achieve perfect robustness for changing channel parameters. Besides, the COST 2100 channel model is used, which is more suitable for simulating the IoV scenarios. Moreover, the channel estimation scheme based on CNN al-gorithm can be used favorably in the non-linear MIMO and IoV scenarios. Simulation results show that the CNN-based CE scheme we proposed achieves outstanding mean squared error (MSE) performance compared to the Generalized Approximate Messaging (GAMP) algorithm. Furthermore, the rationality of using the COST 2100 channel model is proven that have excellent performances. © 2022 IEEE.

关键词： MIMO systems

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Research on Comfort Perception and Evaluation of Immersive Experience Equipment in Cultural Tourism

Research on Comfort Perception and Evaluation of Immersive E...

引用

Culture-Oriented Science and technology (CoST), International Conference on

作者： Huibo Hu Zhibin Su Yujian Jiang Lingxi Qu School of Information and Communication Engineering Communication University of China Beijing China Key Laboratory of Acoustic Visual Technology and Intelligent Control System Ministry of Culture and Tourism Beijing China

ISBN: (数字)9798350380347

ISBN: (纸本)9798350380354

Virtual Reality Head-Mounted Display (HMD), also known as VR glasses, is a typical amusement device that provides an immersive viewing experience based on virtual reality technology in cultural tourism equipment. Various factors may cause users to experience different degrees of sensory discomfort when using VR head-mounted displays, posing potential safety risks during performances. This study focuses on typical VR glasses used in cultural tourism performances and evaluates user comfort as the primary indicator. Through subjective evaluation experiment design, it examines the impact of motion conditions, internal scene settings, and VR glasses configuration on users’ comfort perception. The research aims to provide theoretical analysis and experimental data to reduce performance safety risks.

关键词： Performance evaluation Visualization Time-frequency analysis Head-mounted displays Glass Resists Immersive experience

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Model-driven Deep Learning Based Channel Estimation for HPO-MIMO 15

Model-driven Deep Learning Based Channel Estimation for HPO-...

引用

15th International Congress on Image and Signal Processing, BioMedical engineering and Informatics, CISP-BMEI 2022

作者： Liu, Yujia Li, Qingyu Meng, Fanke Xu, Zixin Gong, Yi School of Information Communication Engineering and Control Technology Ministry of Education Beijing Information Science and Technology University China Xian University of Posts and Telecommunications China Tianjin Yinyuan Information Technology CO. Ltd China

ISBN: (数字)9781665488877

ISBN: (纸本)9781665488877

Halved-Phase Only MIMO (HPO-MIMO) can alleviate the problems of high complexity and high power consumption of conventional MIMO. However, due to amplitude loss, HPO-MIMO cannot adopt the conventional receiver scheme. We propose an HPO-MIMO Channel Estimation (CE) scheme based on model-driven deep learning. Specifically, we use the Generalized Approximate Message Passing (GAMP) algorithm to generate preliminary channel estimation results. Then the Deep Neural Network (DNN) is used to refine the estimation values to obtain more accurate channel estimation results. Simulation results indicate that the presented DNN-based scheme retains the preponderance of the traditional GAMP algorithm but performs better than the latter. When the Mean Square Error (MSE) is -20dB, there is a Signal-Noise Ratio (SNR) gain of about 13dB between them. In addition, the DNN channel estimation method based on GAMP is proved suitable for different antenna sizes, antenna distances, and user densities. © 2022 IEEE.

关键词： Channel estimation

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Adaptive Sliding-Mode Fault Tolerant control for Delayed Nonlinear Systems with Actuator Fault 7

Adaptive Sliding-Mode Fault Tolerant Control for Delayed Non...

引用

7th International Conference on control Science and Systems engineering, ICCSSE 2021

作者： Zhang, Hongxu Hu, Jun Yu, Xiaoyang Chen, Dongyan Harbin University of Science and Technology School of Measurement Control Technology Communication Engineering Department of Mathematics Harbin China Harbin University of Science and Technology Department of Mathematics Harbin China Harbin University of Science and Technology School of Measurement Control Technology Communication Engineering Harbin China

ISBN: (纸本)9781665444057

This paper focuses on the sliding mode fault-tolerant control (SMFTC) problem for a class of delayed nonlinear systems in presence of actuator fault and nonlinear input. Firstly, the augmented strategy involving system state, actuator fault and external disturbance is constructed, and then the fault-tolerant observer is designed accordingly. An SMFTC law ensuring the asymptotical stability of the reduce-order estimation error is provided subsequently. To further illustrate the system performance, a new sliding function with respect to decomposed signal is constructed and the asymptotically stability of sliding motion is analyzed. Moreover, a novel adaptive-based sliding mode controller is presented to steer the system state onto the sliding manifold. Finally, a verification example is considered to demonstrate the usefulness of the proposed SMFTC approach. © 2021 IEEE.

关键词： Sliding mode control

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Design of miniaturized zoom optical system 4

Design of miniaturized zoom optical system

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4th International Conference on Laser, Optics, and Optoelectronic technology, LOPET 2024

作者： Wu, You Huo, Wei Zhang, Guosheng Mu, Sen He, Tianyuan Huang, Xiaojing School of Control Engineering Northeastern University at Qinhuangdao 143 Taishan Road Qinhuangdao066004 China School of Economics and Finance Xi’an International Studies University No.6 Wenyuan South Road Guodu Education Technology Industry Development Zone Chang'an District Xi’an710000 China School of Control Management Northeastern University at Qinhuangdao 143 Taishan Road Qinhuangdao066004 China Sydney Institute of Intelligent Technology Northeastern University at Qinhuangdao 143 Taishan Road Qinhuangdao066004 China School of Computer and Communication Engineering Northeastern University at Qinhuangdao 143 Taishan Road Qinhuangdao066004 China

ISBN: (纸本)9781510681903

Zoom optical systems are versatile, serving applications from daily life, including photography, monitoring, and microscopy, to aerospace and national defense construction. With increasing applications, their performance standards are escalating. This paper introduces a 50mm-150mm three-configuration continuous zoom optical system. Employing a positive compensation structure, it achieves optical zoom in the visible band (390nm-760nm). Composed of six spherical glass lenses, it boasts a compact design with a total length of 40mm and a max aperture of 66mm, ensuring an F-number superior to 5 at long focal lengths. This system meets miniaturization demands while maintaining a high MTF (>0.32) across the entire field of view in the visible light band. The design fulfills high-performance criteria and offers valuable insights for the design of visible-band zoom optical systems with high magnification ratios and miniaturized footprints. © 2024 SPIE.

关键词： Optical systems

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