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Control of fractional chaotic and hyperchaotic systems based on a fractional order controller

Chinese Physics B 2014年第8期23卷 274-284页

作者： Li Tian-Zeng Wang Yu Luo Mao-Kang College of Mathematics Sichuan University Chengdu 610065 China Sichuan Province University Key Laboratory of Bridge Non-destruction Detecting and Engineering Computing School of Science Sichuan University of Science and Engineering Zigong 643000 China

We present a new fractional-order controller based on the Lyapunov stability theory and propose a control method which can control fractional chaotic and hyperchaotic systems whether systems are commensurate or incommensurate. The proposed control method is universal, simple, and theoretically rigorous. Numerical simulations are given for several fractional chaotic and hyperchaotic systems to verify the effectiveness and the universality of the proposed control method.

关键词： fractional-order chaotic system chaos control fractional-order controller hyperchaos

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Simulation of Manipulator Path Planning Based on Improved RRT∗ Algorithm 5

Simulation of Manipulator Path Planning Based on Improved RR...

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5th International Conference on Pattern Recognition and Artificial Intelligence, PRAI 2022

作者： Liu, XueShen Cao, Lijia Sichuan University of Science & Engineering Artificial Intelligence Key Laboratory of Sichuan Province Sichuan Prov. Univ. Key Laboratory of Bridge Non-Destruction Detecting and Engineering Computing Yibin China

ISBN: (数字)9781665499163

ISBN: (纸本)9781665499163

The problem of obstacle avoidance path planning of 6-axis manipulator is studied. After analyzing the disadvantages of large randomness and low algorithm efficiency of RRT*, an improved RRT∗ algorithm is proposed, which can quickly search the shortest expected path that can effectively avoid obstacles. Firstly, the path pruning process of RRT∗ is improved to improve the degree of path optimization, and then the global sampling space is reduced, so that the random tree can quickly expand to the target point. The algorithm is verified on the MATLAB simulation platform. The results show that the average time of path search and the number of expansion nodes of the improved RRT∗ algorithm are greatly reduced, the path length is also better than the traditional RRT*, and can be well applied to the path planning of manipulator. © 2022 IEEE.

关键词： Motion planning

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A homomorphic universal re-encryptor for identity-based encryption

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International Journal of Network Security 2017年第1期19卷 11-19页

作者： Liu, Liang Ye, Jun Xidian University No. 2 South Taibai Road Yanta District Xi'an Shaanxi710071 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science and Engineering No. 180 School Street Huixing Road Sichuan643000 China Sichuan Province University Key Laboratory of Bridge Non-destruction Detecting and Engineering Computing No. 180 School Street Huixing Road Sichuan643000 China

Re-encryption (or proxy re-encryption) is a very useful cryptographic primitive which is able to transform a ciphertext under one public key into a new ciphertext encrypting the same message but under another different public key. It plays an important role in modern secure communication and information exchange via various kinds of network infrastructure. In addition to traditional public-key encryption scheme, re-encryption can also come into force in other cryptosystems like Identity-Based Encryption (IBE) and more advanced Functional Encryption (FE), making the enhanced schemes more powerful as well as easy-to-use. In this work, we have proposed a novel identity-based proxy re-encryption (IBPRE) scheme which to the maximum extent reduces the workloads in the user side by delivering the re-encryption key (RK) generation work to the proxy server. Besides, it is likewise able to prevent possible bottlenecks for the users, like re-encryption key management.

关键词： Public key cryptography

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Hyperchaos in the fractional-order Lü system and its synchronization

Hyperchaos in the fractional-order Lü system and its synchr...

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3rd International Conference on Applied Materials and Electronics engineering, AMEE 2014

作者： Li, Tia Zeng Wang, Yu School of Science Sichuan University of Science and Engineering Zigong 643000 China Sichuan Province Uni. Key Lab. of Bridge Non-destruction Detecting and Engineering Computing Sichuan University of Science and Engineering Zigong 643000 China

ISBN: (纸本)9783038350583

The hyperchaotic behaviors in the fractional hyperchaotic Lü system are studied. And we give the lowest orders for generating hyperchaos with different control parameter. Hyperchaos synchronization of Lü system is theoretically and numerically studied using the one-way coupling method. The numerical simulation results demonstrate the effectiveness and validity of the method. © (2014) Trans Tech Publications, Switzerland.

关键词： Synchronization

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Distributional Chaoticity of the Minimal Subshift of Shift Operators

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Journal of Applied Mathematics and Physics 2024年第5期12卷 1647-1660页

作者： Yuanlin Chen Tianxiu Lu Jiazheng Zhao College of Mathematics and Statistics Sichuan University of Science and Engineering Zigong China Key Laboratory of Bridge Non-destruction Detecting and the Engineering Computing Zigong China

This paper focus on the chaotic properties of minimal subshift of shift operators. It is proved that the minimal subshift of shift operators is uniformly distributional chaotic, distributional chaotic in a sequence, d... 详细信息

关键词： Shift Operators Subshift Distributional Chaoticity

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A Geometric Gaussian Kaczmarz Method for Large Scaled Consistent Linear Equations

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Journal of Applied Mathematics and Physics 2021年第11期9卷 2954-2965页

作者： Li Wen Feng Yin Yimou Liao Guangxin Huang College of Mathematics and Statistics Sichuan University of Science and Engineering Zigong China Sichuan Province University Key Laboratory of Bridge Non-Destruction Detecting and Engineering Computing Zigong China College of Mathematics and Physics Chengdu University of Technology Chengdu China

This paper presents a geometric Gaussian Kaczmarz (GGK) method for solving the large-scaled consistent linear systems of equation. The GGK method improves the geometric probability randomized Kaczmarz method in [1] by introducing a new block set strategy and the iteration process. The GGK is proved to be of linear convergence. Several numerical examples show the efficiency and effectiveness of the GGK method.

关键词： Gaussian Kaczmarz Convergence Rate Linear Systems Consistent

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A Relaxed Greedy Block Kaczmarz Method for Solving Large Consistent Linear Systems

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Journal of Applied Mathematics and Physics 2021年第12期9卷 3032-3044页

作者： Yimou Liao Feng Yin Guangxin Huang College of Mathematics and Statistics Sichuan University of Science & Engineering Zigong China Sichuan Province University Key Laboratory of Bridge Non-destruction Detecting and Engineering Computing Zigong China College of Mathematics and Physics Chengdu University of Technology Chengdu China

Many problems in science and engineering require solving large consistent linear systems. This paper presents a relaxed greedy block Kaczmarz method (RGBK) and an accelerated greedy block Kaczmarz method (AGBK) for solving large-size consistent linear systems. The RGBK algorithm extends the greedy block Kaczmarz algorithm (GBK) presented by Niu and Zheng in [1] by introducing a relaxation parameter to the iteration formulation of GBK, and the AGBK algorithm uses different iterative update rules to minimize the running time. The convergence of the RGBK is proved and a method to determine an optimal parameter is provided. Several examples are presented to show the effectiveness of the proposed methods for overdetermined and underdetermined consistent linear systems with dense and sparse coefficient matrix.

关键词： Linear Consistent Systems Convergence Properties Relaxed Greedy Block Kaczmarz

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Synthetic aerial image generation and runway segmentation 2nd

Synthetic aerial image generation and runway segmentation

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2nd International Conference on Smart Multimedia, ICSM 2019

作者： Sharma, Harsh Liu, Changjiang Cheng, Irene Department of Computing Science University of Alberta EdmontonABT6G 2R3 Canada Sichuan Province University Key Laboratory of Bridge Nondestruction Detecting and Engineering Computing Sichuan University of Science and Engineering Zigong643000 China

ISBN: (纸本)9783030544065

Vision assisted navigation is an active area of research to assist pilots during bad weather conditions. However, these systems are not completely accurate. We propose 3D models to synthesize accurate 2D representations of the airport and the runway. A synthesized image sequence obtained from a 3D model of a view would be effective in conveying 3-D characteristics of the vanishing point (intersection between the horizon line and runway axis) and the beginning of the runway to the pilot. This can help to improve the pilot’s visual perception of the surroundings under adverse weather conditions, leading to a safer landing. We propose a system to generate 2D images of runway captured during takeoff and landing to provide better tracking. We analyze the results by segmenting the runway and comparing it with actual data captured by the aircraft. © Springer Nature Switzerland AG 2020.

关键词： Image segmentation

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Fog removal of aerial image based on gamma correction and guided filtering 2nd

Fog removal of aerial image based on gamma correction and gu...

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2nd International Conference on Smart Multimedia, ICSM 2019

作者： Liu, Xinggang Liu, Changjiang Lan, Hengyou College of Automation and Information Engineering Sichuan University of Science and Engineering Zigong643000 China College of Mathematics and Statistics Sichuan University of Science and Engineering Zigong643000 China Sichuan Province University Key Laboratory of Bridge Nondestruction Detecting and Engineering Computing Sichuan University of Science and Engineering Zigong643000 China

ISBN: (纸本)9783030544065

In order to improve the pilots’ perception of the runway and the surrounding things in foggy days and improve the visual effect of aerial images, a combination of Gamma correction and Retinex de-fogging algorithm is proposed for aerial foggy images. First of all, the original image is corrected by Gamma as the guided map, and the light intensity of the aerial image is estimated by the guided filter, and the preliminary fog removal image is obtained by Retinex. In combination with the histogram truncation technique, the output of the image is mapped to between 0 and 255, then a de-fogging enhanced image is achieved. Compared with other de-fogging algorithms, this algorithm has higher contrast and color consistency. © Springer Nature Switzerland AG 2020.

关键词： Image enhancement

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An Improved Lightweight Small Target Detection Algorithm for Air-to-Ground Image

SSRN

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SSRN 2022年

作者： Cao, Lijia Song, Pinde Wang, Yongchao Geng, Chuang Peng, Baoyu Sichuan University of Science & Engineering Yibin644000 China Technical University of Munich Munich80333 Germany Artificial Intelligence Key Laboratory of Sichuan Province Yibin644000 China Sichuan Province University Key Laboratory of Bridge Non-destruction Detecting and Engineering Computing Yibin644000 China

Air-to-Ground target detection algorithm is of great significance to achieve military countermeasures and disaster search and rescue. The state-of-the-art object detection algorithm, YOLOv5, has been widely used to detect UAV image. However, it suffers some challenges, such as high FLOPs, redundant parameters, longer inference time and poor performance of small target detection. To address these issues, an improved lightweight object detection method is proposed for UAVs images. In the presented method, MobileNetv3 is introduced into the YOLOv5 backbone network to reduce the parameters and float-point operations(FLOPs). An extra prediction head is introduced into the shallow layer of the neck to improve the algorithm's ability of small targets. Besides, we design two kinds of neck structures with different parameter scales to meet the requirements of different embedded devices. Finally, the Hardswish activation function is used in the neck network to accelerate the inference speed of the improved algorithm. To validate the performance of the proposed improved algorithm, we tested our algorithm in VisDrone-Det2019 dataset. The results show that, compared with YOLOv5l and YOLOv5x, the number of parameters of MEN-YOLOv5-L decreased by 87.4% and 93.3%, the FLOPs decreased by 47.2% and 72.1%, and mAP@0.5 increased by 7.3% and 5.9%, respectively. MEN-YOLOv5-S has 51.4% and 38.4% lower number of parameters and FLOPs, respectively, and 2.5% higher mAP@0.5 than YOLOv5s. © 2022, The Authors. All rights reserved.

关键词： Image enhancement

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