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Adaptive Impulsive Consensus of Nonlinear Multiagent Systems With Limited Bandwidth Under Uncertain Deception Attacks

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IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS 2024年第8期54卷 4592-4604页

作者： Ren, Chang-E Li, Junhui Shi, Zhiping Guan, Yong Chen, C. L. Philip Capital Normal Univ Coll Informat Engn Beijing 100048 Peoples R China South China Univ Technol Sch Comp Sci & Engn Guangzhou 510641 Peoples R China Dalian Maritime Univ Coll Nav Dalian 116026 Peoples R China

At present, the dynamic encoding-decoding scheme is utilized in the impulsive consensus control of multiagent systems (MASs) to solve the limited bandwidth problem. However, the unknown nonlinear dynamics and deception attacks will generate some uncertainties inevitably in the encoding-decoding, which may cause the quantizer saturation and then influence the consensus performance. Therefore, the impulsive consensus control problem of uncertain nonlinear MASs based on encoding-decoding under deception attacks is investigated in this article. To address the system uncertainty, an adaptive algorithm with neural networks is designed. Under the proposed estimator for each follower, the designed adaptive law for every follower only needs the information from its own sensor and estimator instead of the quantized information from its neighbors. Then a more general scenario of uncertain deception attack is considered, in which the uncertain deception attacks can occur in the both parts of hybrid impulsive control protocol. An attack observer is introduced to handle this more complex attack by compensating impacts of deception attacks. Next the sufficient conditions for secure consensus of MASs with limited bandwidth are derived. Moreover, although some uncertainties exist in the encoding-decoding, the quantizer saturation can be eliminated by adjusting the parameters of controller. Finally, the validity of given theorems is demonstrated by the simulation experiments.

关键词： Actuator attack adaptive impulsive control encoding-decoding multiagent systems (MASs)

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Regulation performance limitation of networked time-delay systems with incomplete information

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ASIAN JOURNAL OF CONTROL 2023年第3期25卷 2326-2335页

作者： Li, Qianhao Yang, Qingsheng Zhan, Xisheng Yan, Huaicheng Hubei Normal Univ Coll Elect Engn Huangshi 435002 Hubei Peoples R China East China Univ Sci & Technol Minist Educ Key Lab Adv Control & Optimizat Chem Proc Shanghai 200237 Peoples R China

In this paper, the regulation performance limitation of networked time-delay systems is studied. The communication network is mainly affected by parameters such as packet dropouts, encoding-decoding, interference signal, and channel noises. Non-minimum phase zeros, unstable poles, and time delay are all considered for a given plant. The corresponding regulation performance expression is derived using coprime factorization and spectral decomposition techniques in the frequency domain. The results indicate that the regulation performance of the system is related to the inherent characteristics of the given plant, including non-minimum phase zeros, unstable poles, and time delay. Additionally, network communication parameters such as white Gaussian noise, packet dropouts, encoding-decoding, and external interference signals all affect the regulation performance of networked time-delay systems. Finally, some simulation examples are provided to demonstrate the effectiveness of the theory.

关键词： encoding-decoding interference signal packet dropouts regulation performance

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BGAE: Auto-encoding Multi-View Bipartite Graph Clustering

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IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 2024年第8期36卷 3682-3696页

作者： Li, Liang Pan, Yuangang Liu, Jie Liu, Yue Liu, Xinwang Li, Kenli Tsang, Ivor W. Li, Keqin Natl Univ Def Technol Sch Comp Changsha 410073 Peoples R China ASTAR Ctr Frontier AI Res Singapore 138632 Singapore Natl Univ Def Technol Sci & Technol & Parallel & Distributed Proc Lab Changsha 410073 Peoples R China Natl Univ Def Technol Lab Software Engn Complex Syst Changsha 410073 Peoples R China Hunan Univ Coll Comp Sci & Elect Engn Changsha 410073 Peoples R China Hunan Univ Supercomp & Cloud Comp Inst Changsha 410073 Peoples R China SUNY Coll New Paltz Dept Comp Sci New Paltz NY 12561 USA

Unsupervised multi-view bipartite graph clustering (MVBGC) is a fast-growing research, due to promising scalability in large-scale tasks. Although many variants are proposed by various strategies, a common design is to construct the bipartite graph directly from the input data, i.e., only consider the unidirectional "encoding" process. However, "encoding-decoding" mechanism is a popular design for deep learning, the most representative one is auto-encoder (AE). Enlightened by this, this paper rethinks existing MVBGC paradigms and transfers the "encoding-decoding" design into graph machine learning, and proposes a novel framework termed auto-encoding multi-view bipartite graph clustering (BGAE), which integrates encoding, bipartite graph construction, and decoding modules in a self-supervised learning manner. The encoding module extracts a latent joint representation from the input data, the bipartite graph construction module learns a bipartite graph with connectivity constraint in latent semantic space, and the decoding module recreates the input data via the bipartite graph. Therefore, our novel BGAE combines representation learning, bipartite graph learning, reconstruction learning, and label inference into a unified framework. All the modules are seamlessly integrated and mutually reinforcing for clustering-friendly purposes. Extensive experiments verify the superiority of our novel design and the significance of "decoding" process. To the best of our knowledge, this is the first attempt to explore "encoding-decoding" design in traditional MVBGC.

关键词： Bipartite graph decoding Machine learning encoding Synthetic data Matrix decomposition Image reconstruction Bipartite graph learning encoding-decoding graph machine learning multi-view clustering

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Optimal Tracking Performance Analysis of MIMO Control Systems Under Multiple Constraints

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IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS 2022年第5期52卷 2734-2743页

作者： Cheng, Lingli Yan, Huaicheng Chi, Ming Zhan, Xisheng Zhou, Ge East China Univ Sci & Technol Key Lab Adv Control & Optimizat Chem Proc Minist Educ Shanghai 200237 Peoples R China Hubei Normal Univ Coll Mechatron & Control Engn Huangshi 435002 Hubei Peoples R China Huazhong Univ Sci & Technol Coll Artificial Intelligence & Automat Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Key Lab Image Proc & Intelligent Control Minist Educ Wuhan 430074 Peoples R China Shanghai Electromech Engn Inst Shanghai 201109 Peoples R China

This article is concerned with the optimal tracking performance on linear time-invariant (LTI) discrete-time multi-input-multi-output (MIMO) systems based on quantization, channel noise, and encoding-decoding, as well as bandwidth constraints. Meanwhile, power constraint, feedback and feedforward loops constraints of the systems are also taken into account. The tracking performance expression is described by inner-outer factorization, which is obtained by all stabilizing two-degree-of-freedom compensators. The results will illustrate that tracking performance limitation is decided by nonminimum phase zeros and unstable poles of the given plant. Moreover, time delay, encoding-decoding, channel noise, quantization, and bandwidth constraints also impact the performance. The accuracy of the method is verified by simulation examples.

关键词： Quantization (signal) MIMO communication Bandwidth Linear systems Delay effects decoding Communication channels Bandwidth constraints encoding-decoding noise quantization tracking performance

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Improved Model-Free Adaptive Control for MIMO Nonlinear Systems With Event-Triggered Transmission Scheme and Quantization

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IEEE TRANSACTIONS ON CYBERNETICS 2023年第9期53卷 5867-5880页

作者： Zhu, Panpan Jin, Shangtai Bu, Xuhui Hou, Zhongsheng Beijing Jiaotong Univ Sch Elect & Informat Engn Inst Adv Control Syst Beijing 100044 Peoples R China Henan Polytech Univ Sch Elect Engn & Automat Jiaozuo 454000 Henan Peoples R China Qingdao Univ Sch Automat Qingdao 266071 Peoples R China

In this article, an improved model-free adaptive control (iMFAC) is proposed for discrete-time multi-input multioutput (MIMO) nonlinear systems with an event-triggered transmission scheme and quantization (ETQ). First, an event-triggered scheme is designed, and the structure of the uniform quantizer with an encoding-decoding mechanism is given. With the concept of partial form dynamic linearization based on event-triggered and quantization (PFDL-ETQ), a linearized data model of the MIMO nonlinear system is constructed. Then, an improved model-free adaptive controller with the ETQ process is designed. By this design, the update of the pseudo partitioned Jacobean matrix (PPJM) estimates and control inputs occurs only when the trigger conditions are met, which reduces the network transmission burden and saves the computing resources. Theoretical analysis shows that the proposed iMFAC with the ETQ process can achieve a bounded convergence of tracking error. Finally, a numerical simulation and a biaxial gantry motor contour tracking control system simulation are given to illustrate the feasibility of the proposed iMFAC method with the ETQ process.

关键词： Quantization (signal) MIMO communication Process control Control systems Adaptation models Task analysis Jacobian matrices Bounded convergence encoding-decoding event-triggered transmission scheme and quantization (ETQ) improved model-free adaptive control (iMFAC) multi-input multioutput (MIMO) partial form dynamic linearization based on event-triggered and quantization (PFDL-ETQ) pseudo partitioned Jacobean matrix (PPJM)

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Basic Arithmetic Coding Based Approach to Compress a Character String 1

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5th International Conference on Frontiers in Intelligent Computing - Theory and Applications (FICTA)

作者： Mondal, Ipsita Sarkar, Subhra J. Techno India Batanagar Dept CSE Kolkata India Techno India Batanagar Dept EE Kolkata India

ISBN: (数字)9789811031533

ISBN: (纸本)9789811031533;9789811031526

Data compression plays an important role for storing and transmitting text or multimedia information. This paper refers to a lossless data algorithm is developed in C-platform to compress character string based on Basic Arithmetic Coding. At the preliminary stage, this algorithm was tested for the character array comprising of vowels only and the probability distribution is assumed arbitrarily. The result being obtained is encouraging with compression ratio far beyond unity. Though the algorithm was tested for vowels only but the work can be extended for any character array with probability of distribution as obtained from the survey of few randomly selected articles.

关键词： Data compression technique Basic arithmetic coding Probability distribution encoding-decoding Compression ratio

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Radio edutainment and participatory communication for social change: A case of lived reality among a rural Malawian audience

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JOURNAL OF AFRICAN MEDIA STUDIES 2022年第2期14卷 309-325页

作者： Kamlongera, Mtisunge Isabel Oslo Metropolitan Univ Oslo Norway

This article draws upon research exploring a project that combines edutainment and participatory communication strategies as an approach to social change in Malawi. Throughout the research, I take a critical stance that seeks to uplift voices of an audience attending a radio listening club (RLC) and therefore utilize participatory methods to co-create the body of knowledge with study participants. In this article, I query RLC audience's thoughts of the project's relevance and influence in their daily lives. Oriented by Hall's concepts of encoding and decoding, I analyse my data focusing on the dynamics between the objectives of the producers and the lived reality of the participants. Findings reveal that audience's motivation for continued attendance of the RLC is different to that intended in the encoding process;rather audiences negotiate the relevance of messages to their own needs, those of their children and utilize the space to extend their social capital.

关键词： edutainment participatory communication dialogue encoding-decoding Freire culture circles

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Performance comparison of high speed LAN optical CDMA systems at different data rates

Performance comparison of high speed LAN optical CDMA system...

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9th International Conference on Transparent Optical Networks (ICTON 2007)

作者： Gupta, Neena Saxena, Divyesh Mohan Punjab Engn Coll E&EC Dept Chandigarh India

ISBN: (纸本)9781424412488

OCDMA is a highly flexible technique to achieve high-speed connectivity with large bandwidth. Data access security and ability to support asynchronous, bursty data transmission are two of the main driving forces behind a lot of interest in the OCDMA techniques. On the other hand, the poor spectral efficiency of OCDMA systems demand appropriate choice of coding techniques and multi-access interference (MAI) is often a limiting factor. This paper describes a simulated model for an incoherent Gigabit OCDMA system using high performance W/T codes. 60 km fiber amplifier span has been used in this model. Earlier work has been done at 1.25Gbps for 16 users. In this paper OCDMA system beyond 1.25 Gbps is suggested by redesigning W/T code using 8-wavelength and 8-time slots. By using modified W/T code the MAI reduces. The analysis takes into account the effect of data rates for increasing number of simultaneous users and received power. The system performance is evaluated by eye diagram and BER analysis at different data rates. The system has been designed for 1 Gbps, 1.25 Gbps, 2.5 Gbps and 5 Gbps. BER analysis for asynchronous concurrent communication of multiple users at different data rates has been done. Results show that the Bit-Error-Rate performance for 1.25 Gbps improves in comparison to previous designs. The designed system provides adequate BER (< 10(-9)) for 2.5 Gbps up to 16 users and for 5 Gbps up to 8 users.

关键词： optical orthogonal codes encoding-decoding multiple access interference optical code division multiple access (O-CDMA)

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A Novel Cost Effective Access Control and Auto Filling Form System using QR Code

A Novel Cost Effective Access Control and Auto Filling Form ...

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International Conference on Advances in Computing, Communications and Informatics ICACCI

作者： Khandal, Dinesh Somwanshi, Devendra Poornima Coll Engn Dept CSE Jaipur Rajasthan India Poornima Coll Engn Jaipur Rajasthan India

ISBN: (纸本)9781479987924

QR codes are used to store information in two dimensional grids which can be decoded quickly. The proposed work here deals with Quick response (QR) code extending its encoding and decoding implementation to design a new articulated user authentication and access control mechanism. The work also proposes a new simultaneous registration system for offices and organizations. The proposed system retrieves the candidate's information from their QR identification code and transfers the data to the digital application form, along with granting authentication to authorized QR image from the database. The system can improve the quality of service and thus it can increase the productivity of any organization.

关键词： QR codes Code Reader Proteus Security Authentication encoding-decoding Automated filling form Embedded system

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Quantized Data Driven Model-Free Adaptive Predictive Control for a Class of Nonlinear Systems 12

Quantized Data Driven Model-Free Adaptive Predictive Control...

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IEEE 12th Data Driven Control and Learning Systems Conference (DDCLS)

作者： Liu, Genfeng Hou, Zhongsheng Henan Univ Technol Coll Elect Engn Zhengzhou 450001 Peoples R China Qingdao Univ Sch Automat Qingdao 266071 Peoples R China

ISBN: (纸本)9798350321050

In this paper, a quantized data driven model-free adaptive predictive control algorithm is presented for a class of nonlinear systems to deal with the limited network transmission capacity. Firstly, a uniform quantizer is designed to handle the network bandwidth limitation and an encoding-decoding mechanism is introduced to reduce the effects of quantization errors. Secondly, based on compact form dynamic linearization method, by only utilizing the input and output data of the control system, a quantized data driven control scheme is designed. Finally, a simulation is given to show the effectiveness and robustness of the presented control algorithm.

关键词： Quantizer encoding-decoding model-free adaptive predictive control MFAC data driven control

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