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Use of Optimal Constrained Covariance control (OC 3 ) in Dynamic Positioning of Floating Vessels

IFAC Proceedings Volumes 1995年第2期28卷 9-15页

作者： S. Mandžuka Z. Vukić Control Engineering Department Brodarski institute d.o.o. Av. V. Holjevca 20 41000 Zagreb CROATIA Department of Control and Computer Engineering in Automation University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 41000 Zagreb CROATIA

A new technique for control system design based on the Optimal Constrained Covariance control (OC 3 ) is presented. A design procedure of control system for dynamic ship positioning is proposed. In the papers published so far the controller gain matrices were detennined using the classical Linear Quadratic Gaussian (LQG) optimal control technique, the pole-placement technique and characteristic locus design method. The main disadvantage of these techniques is their poor correspondence with the real performance requirements of control system. Using the proposed technique this disadvantage is avoided. The results of computer simulation using OC 3 control are presented.

关键词： LQG control Constrained covariance control Dynamic positioning

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A parallel-computation model for nonlinear electromagnetic field analysis by harmonic balance finite element method

A parallel-computation model for nonlinear electromagnetic f...

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IEEE International Conference on Algorithms and Architectures for Parallel Processing (ICAP)

作者： Junwei Lu Yao Li Chengzheng Sun S. Yamada School of Microelectronic Engineering Griffith University Nathan QLD Australia School of Computing and Information Technology Feculty of Science and Technology Griffith University Nathan QLD Australia Laboratay of Magnetic Field Control and Applications Faculty of Technology Kanagawa University Kanagawa Japan

This paper presents a parallel computation model for the time-periodic nonlinear electromagnetic field analysis in the frequency domain using harmonic balance finite element method (HBFEM). The proposed model, different from the traditional HBFEM technique that requires large memory and long CPU time, divides the global system matrix into a number of matrices in the frequency domain. Each computation unit has exactly the same number of elements and unknown values. The work involved in calculating the element matrices is equal, therefore the load can be well-balanced and the maximum speed-up will be M times if M processors are available (M is the number of harmonics considered in the electromagnetic field). The model is well-suited to MIMD parallel computer or multiple computers connected by local area networks.< >

关键词： Electromagnetic modeling Electromagnetic fields Concurrent computing Frequency domain analysis Computer networks Computational modeling Electromagnetic analysis Harmonic analysis Finite element methods Central Processing Unit

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Simplified analysis of the three-phase PWM switching converter

Simplified analysis of the three-phase PWM switching convert...

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International Conference on Industrial Electronics, control and Instrumentation

作者： N.A. Rahim T.C. Green B.W. Williams Department of Electrical Engineering Control and Systems Theory Faculty of Engineering University Malaya Kuala Lumpur Malaysia Department of Electrical & Electronic Engineering Imperial College London London UK Department of Computing Electrical Engineering Heriot-Watt University Edinburgh UK

Pulsewidth modulation, similar to voltage-space vector control in switches utilizing a field programmable gate array, is compared with PSpice simulation in a three switches converter is presented. The PSpice simulation is used in time domain simulation of the rectifier and inverter circuit. The PSpice PWM simulation modelled is compared with the experiment which is implemented in a field programmable gate array based on a carrier frequency of 19.2 kHz. The PWM is applied to the converter operated as a step-down converter where the output voltage can be controlled by the modulation index in the range of 0 to 1.5 V/spl circ//sub ph/. Simulation and experimental results are provided to demonstrate the effectiveness of the proposed model.

关键词： Pulse width modulation Pulse width modulation converters Switching converters Circuit simulation Switches Field programmable gate arrays Modulation coding Rectifiers Pulse width modulation inverters Frequency

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A RELIABLE AND EFFICIENT LINEAR-PROGRAMMING ALGORITHM FOR 2-LEVEL POWER-SYSTEM STATE ESTIMATION

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ELECTRIC POWER SYSTEMS RESEARCH 1988年第1期14卷 51-60页

作者： LO, KL SALEM, MM Power Systems Research Group Department of Electronic and Electrical Engineering University of Strathclyde 204 George Street Glasgow Scotland U.K. Control and Computing Engineering Faculty of Engineering El-Mansoura University El-Mansoura Egypt

Two linear programming (LP) algorithms for the integrated state estimation (ISE) for the whole system are formulated and tested. It was found that a direct application of an ISE on a large power system suffers certain limitations. This paper presents an efficient and reliable two-level state estimator (TLSE) based on LP techniques. Both the ISE and the proposed TLSE were tested under different conditions. The results are discussed and comparisons are given which show that the TLSE has many advantages over the ISE.

关键词： ELECTRIC POWER SYSTEMS

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A method for selecting good feedback structures

A method for selecting good feedback structures

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IEEE Conference on Decision and control

作者： J. D. Katzberg H. H. Johnson Faculty of Engineering University of Regina Regina SAS Canada Department of Computing and Control Imperial College of Science and Technology London UK

An approximate method of calculating the contributions of the gains in a feedback structure is produced. The discrete time, linear, quadratic state feedback problem is considered. By state and control augmentation dynamic compensators with fixed and tunable parameters including decentralized and hierarchal structures can, also, be handled. An example is used to illustrate the usefulness of the approach in selecting good simplified feedback structures and to verify the reasonableness of the assumptions.

关键词： Optimal control State feedback Cost function Linear feedback control systems Educational institutions Taylor series

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SRF: SpectrumRecombineFormer for Hyperspectral Image Classification

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ACM Transactions on Multimedia computing, Communications, and Applications 1000年

作者： Weipeng Jing Peilun Kang Donglin Di Juntao Gu Linhui Li Mahmoud Emam Linda Mohaisen Xun Yang Chao Li College of Computer and Control Engineering Northeast Forestry University China Li Auto China Heilongjiang Cyberspace Research Center China Faculty of Artificial Intelligence Menoufia University Egypt Information Technology Faculty of Computing and Information Technology King Abdulaziz University Saudi Arabia University of Science and Technology of China School of Information Science and Technology China

Hyperspectral (HS) imaging is a valuable technique for accurately classifying materials because of the abundance of spectral information and high resolution it provides. However, the characteristics of Hyperspectral images (HSI), such as high-dimensional features and information redundancy, pose significant challenges to data processing. Traditional dimensionality reduction methods often have information loss, high computational complexity, and easy to ignore the strong correlation between HSI spectral bands when dealing with HSI data. Although other methods can achieve satisfactory classification performance, they do not consider the dimensionality reduction of HSI, and they focus on the model performance, which limits further improvement in classification performance. This paper proposes a transformer-based framework called “SpectrumRecombineFormer” (SRF), which is composed of two key modules, namely “Spatial Spectral ReCombination” (SSRC) and “Cross-layer Fusion” (CF). The SSRC is capable of utilizing both adjacent and non-adjacent spectrums to generate the spatial-sequential perceptive representations, which alleviates the effect of the strong correlation between HSI spectral bands. The CF can avoid the loss of information during the feed-forward procedure among layers. Extensive experiments on five existing datasets (widely-adopted Indian Pines, Houston2013, Pavia University, Salinas and KSC) demonstrate the capability of our proposed method to address the above mentioned challenges. Both quantitative and qualitative experimental ablation studies, including visualization results, reveal that the proposed SRF method can successfully and efficiently classify hyperspectral images and surpass the other state-of-the-art methods. For access to the source code, please visit https://***/kangpeilun/SRF-HSI-Classification-master.

关键词： hyperspectral image classification dimensionality reduction skip fusion swin-transformer remote sensing

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Manufacturing Systems control Design 1

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丛书名： Advances in Industrial control

1000年

作者： Stjepan Bogdan Zdenko Kovačić Frank L. Lewis José Mireles

ISBN: (数字)9781846283345

ISBN: (纸本)9781852339821;9781849969895

The series Advances in Industrial control aims to report and encourage technology transfer in control engineering. The rapid development of control technology has an impact on all areas of the control discipline. New theory, new controllers, actuators, sensors, new industrial processes, computer methods, new applications, new philosophies , new challenges. Much of this development work resides in industrial reports, feasibility study papers and the reports of advanced collaborative projects. The series offers an opportunity for researchers to present an extended exposition of such new work in all aspects of industrial control for wider and rapid dissemination. In some areas of manufacturing, the elements of a flexible manufacturing system form the key components of the process line. These key components are four-fold: a set of programmable robots and machines, an automated materia- handling system that allows parts to be freely routed and re-routed, a buffer storage system where parts and partly-assembled components can wait until required for further processing and assembly and finally, a supervisory control system. The technology employed to coordinate and control all these components as a working system is usually based on programmable logic controllers. The use of this automation hardware and software in manufacturing is designed to yield significant cost reductions and to enhance quality.

关键词： control and Systems Theory Industrial and Production Engineering Manufacturing, Machines, Tools, Processes Simulation and Modeling Linear and Multilinear Algebras, Matrix Theory Industrial Organization

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Evaluating Teamwork Components in Large Undergraduate Software Engineering Teams

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ACM Transactions on computing Education 1000年

作者： Luka Dorić Nikola Luburić Jelena Slivka Simona Prokić Anica Đukić Faculty of Technical Sciences Department of Computing and Control Engineering) University of Novi Sad Trg Dositeja Obradovića 6 Novi Sad 21 000 Serbia

Teamwork is crucial in software engineering. However, recent literature concludes that software engineering graduates have underdeveloped teamwork skills. Instructors wishing to develop teamwork skills are faced with many teamwork models and a lack of empirical studies that examine their utility in higher education. We conducted an exploratory study to examine teamwork components of attitudinal, behavioral, and cognitive psychological facets (collectively called ABCs) in eight undergraduate software engineering teams composed of 14 to 17 members. We answered two research questions: Which teamwork components were the least developed at the beginning of the project, and Which teamwork components remained underdeveloped by the end of the project. For each team, we conducted two focus group discussions, and analyzed four sprint retrospective reports during the semester. We synthesize the gathered data to define each team by the presence of teamwork components, development of teamwork components, experienced challenges, average course grades, and project results. Teamwork components that were initially underdeveloped were Mutual performance monitoring, Shared cognitions, Leadership, Communication, Psychological safety and Trust. Two teamwork components that remained underdeveloped were Shared cognitions and Mutual performance monitoring. The answer to our first question highlights teamwork components that instructors should pay attention to in their teamwork-oriented courses. For the second question, we explain the mechanisms that we applied to develop teamwork components and highlight which components were the most challenging to develop, as well as in which period instructors should provide the most support to students. Engineering education researchers might benefit from our methodological design, measurement instruments, and raw data to conduct studies in their contexts.

关键词： Teamwork Teamwork component Higher education Software engineering computing education

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Distributed Learning Mechanisms for Anomaly Detection in Privacy-Aware Energy Grid Management Systems

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ACM Transactions on Sensor Networks 1000年

作者： Jia-Hao Syu Jerry Chun-Wei Lin Gautam Srivastava National Taiwan University Taiwan Faculty of Automatic Control Electronics and Computer Science Department of Distributed Systems and IT Devices Silesian University of Technology Poland Mathematics and Computer Science Brandon University Canada and Research Centre for Interneural Computing China Medical University Taiwan and Computer Science and Mathematics Lebanese American University Lebanon

Smart grids have become an emerging topic due to net-zero emissions and the rapid development of artificial intelligence (AI) technology focused on achieving targeted energy distribution and maintaining operating reserves. In order to prevent cyber-physical attacks, issues related to the security and privacy of grid systems are receiving much attention from researchers. In this paper, privacy-aware energy grid management systems with anomaly detection networks and distributed learning mechanisms are proposed. The anomaly detection network consists of a server and a client learning network, which collaboratively learn patterns without sharing data, and periodically train and exchange knowledge. We also develop learning mechanisms with federated, distributed, and split learning to improve privacy and use Q-learning for decision-making to facilitate interpretability. To demonstrate the effectiveness and robustness of the proposed schemes, extensive simulations are conducted in different energy grid environments with different target distributions, ORRs, and attack scenarios. The experimental results show that the proposed schemes not only improve management performance but also enhance privacy and security levels. We also compare the management performance and privacy level of the different learning machines and provide usage recommendations.

关键词： Anomaly Detection Distributed Learning Federated Learning Split Learning Energy Grid Management

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The 8th International Conference on Knowledge Management in Organizations 1

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丛书名： Springer Proceedings in Complexity

1000年

作者： Lorna Uden Leon S.L. Wang Juan Manuel Corchado Rodríguez Hsin-Chang Yang I-Hsien Ting

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