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27th Annual Conference on Neural Information Processing Systems, NIPS 2013

作者： Frigola, Roger Lindsten, Fredrik Schön, Thomas B. Rasmussen, Carl E. Dept. of Engineering University of Cambridge United Kingdom Div. of Automatic Control Linköping University Sweden Dept. of Information Technology Uppsala University Sweden

State-space models are successfully used in many areas of science, engineering and economics to model time series and dynamical systems. We present a fully Bayesian approach to inference and learning (i.e. state estimation and system identification) in nonlinear nonparametric state-space models. We place a Gaussian process prior over the state transition dynamics, resulting in a flexible model able to capture complex dynamical phenomena. To enable efficient inference, we marginalize over the transition dynamics function and, instead, infer directly the joint smoothing distribution using specially tailored Particle Markov Chain Monte Carlo samplers. Once a sample from the smoothing distribution is computed, the state transition predictive distribution can be formulated analytically. Our approach preserves the full nonparametric expressivity of the model and can make use of sparse Gaussian processes to greatly reduce computational complexity.

关键词： Dynamical systems

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Reconfigurable parallel kinematic manipulator for flexible manufacturing

Reconfigurable parallel kinematic manipulator for flexible m...

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作者： Haage, Mathias Dressler, Isolde Robertsson, Anders Nilsson, Klas Brogardh, Torgny Johansson, Rolf Dept. Computer Science LTH Lund University Lund Sweden Dept. Automatic Control LTH Lund University Lund Sweden ABB Robotics SE-72168 Vasteras Sweden

ISBN: (纸本)9783902661432

Flexible manufacturing puts high demands on industrial automation in terms of affordable and competitive solutions and is of key importance for short-lot production typically found in small and medium sized enterprises, situations where today manual labour is extensively used despite e.g., environmental issues and harsh working conditions. Key factors in the successful introduction of new robot automation concepts are that they provide both the desired performance and quality (technical capability), but also that they enable fast deployment and extend available task repertoire. The Gantry-Tau manipulator is a new robot concept which in contrast to other high-performance parallel kinematic manipulators (PKM), has a large, open working range. Its high stiffness makes it ideal for a wide range of tasks such as grinding, deburring, and cutting. An additional aspect of such a PKM is the modularity, which in this work has been studied in terms of possibilities for assembly and mechanical reconfiguration at the end-user site, integration of such a kinematically different robot with a standard industrial controller, and new needs for methods/tools to support simple (re)configuration. A range of software tools and methods were found to be useful and necessary for efficient engineering and integration of the concept in typical SME manufacturing scenarios. For experimental evaluation, two full-scale prototype robots were designed and built, the kinematic software was developed and integrated into a couple of different robot control systems, robot CAD software was adapted to the configuration needs, and both simulations and physical experiments were carried out. Our findings make us believe that enhanced software tools should be integrated on a higher symbolic (or meta-) level to better support transformation of data and code generation, but also that the Gantry-Tau type of robot (with adequate software support) will bring a new dimension of flexibility into SME manufacturing.

关键词： Kinematics

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Recognition of patient anaesthetic levels: neural network systems, principal components analysis, and canonical discriminant variates

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ARTIFICIAL INTELLIGENCE IN MEDICINE 1997年第2期11卷 155-173页

作者： Linkens, DA Vefghi, L Intelligent Systems Laboratory Department of Automatic Control and Systems Engineering University of Sheffield Sheffield SI 3JD United Kingdom Intelligent Systems Laboratory Automatic Ctrl./Systems Engg. Dept. University of Sheffield Sheffield S1 3JD United Kingdom

The goal of this study was to examine the ability of Neural Networks to recognise the levels of anaesthetic state of a patient. Data obtained under different levels of anaesthesia have been modelled for the purpose. It is shown that inferential parameters can be used to recognise the levels of anaesthesia. In addition to demonstrating the ability of neural networks for classification we were interested in understanding the classification strategy discovered by the neural networks. Multivariate data analysis techniques, namely Principal Components Analysis and Canonical Discriminant Variates, were applied to analyse the resultant networks. (C) 1997 Elsevier Science B.V.

关键词： anaesthesia neural network systems principal components analysis canonical discriminant variates

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Integration of commercial Internet applications in a TINA environment

Integration of commercial Internet applications in a TINA en...

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1999 Telecommunications Information Networking Architecture Conference, TINA 1999

作者： Canal, Gianni Lago, Patricia Intelligent Network Dept. CSELT Torino Italy Dept. of Control and Computer Engineering Politecnico di Torino Torino Italy

ISBN: (纸本)078035785X

Services on the Internet rely on Internet applications, that is software applications distributed between clients and an Internet server relying on IP-based communication. This work demonstrates that they can benefit from the TINA (telecommunications information networking architecture) session concept, and especially from the service session. In detail, our objective was to study both the impact on, and the applicability of the TINA standard, whenever commercial applications are reengineered as TINA services. To achieve this objective, the work described here integrates two commercial conferencing applications in a TINA compliant telecommunication framework, and it extends the applications features to support distance education and traditional conference sessions in a flexible and intuitive way. This paper describes the solution implemented by the authors by showing its overall architecture, and the internal composition of each service component. For each of them, the internal behavior is mapped on a common example scenario. Also, the paper points out the problems encountered and the results achieved, by focusing especially on the enhancements brought by the integrated TINA/Internet solution, and on the benefits added by TINA. Some topics for further work are also discussed. © 1999 IEEE.

关键词： Application programs

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Particle filtering based multiple-model approach to fault diagnosis in nonlinear stochastic systems 6

Particle filtering based multiple-model approach to fault di...

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6th European control Conference, ECC 2001

作者： Li, Ping Kadirkamanathan, Visakan Dept. of Automatic Control and Systems Engineering University of Sheffield SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783952417362

A novel approach to fault diagnosis in nonlinear stochastic systems is proposed. It is based on the particle filtering (PF) algorithm, a Monte Carlo technique based state estimation method, and the multiple model (MM) approach. The simulation results on a univariate model are provided and the fault detection and isolation performance are compared with that using the extended Kalman filter which demonstrate the effectiveness of the proposed approach. © 2001 EUCA.

关键词： Stochastic systems

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The communication network design of the first CIMS application project of China

The communication network design of the first CIMS applicati...

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1992 IEEE International Symposium on Industrial Electronics, ISIE 1992

作者： Wang, Longji Peng, Sixian Dept. of Automatic Control Northwestern Polytech. Univ. Xian China China Computer Center Chengdu Aircraft Corporation Chengdu China

ISBN: (纸本)0780300424

This paper introduces the computer communication network system design of the first CIMS (computer Integrated Manufacturing System) application project of China-CAC (Chengdu Aircraft corporation) CIMS. The network system of CAC CIMS is a complex but typical network system due to the coexistence of different network protocols, heterogeneous mainframes and many kinds of network switch devices. The selection of network protocol and the mutual transform of protocols, the connection scheme of different node computers, the design of network topology and communication line system, the design and configuration of network monitoring and management are presented in detail in this paper. © 1992 IEEE.

关键词： Internet protocols

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High Efficiency and High Gain Hybrid DC-DC Converter with Switched Capacitor 8

High Efficiency and High Gain Hybrid DC-DC Converter with Sw...

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8th Southern Power Electronics Conference and the 17th Brazilian Power Electronics Conference, SPEC / COBEP 2023

作者： Rodrigues, Brenna Theodora MacHado Matos Moura, Mauricio Albuquerque Sá, Edilson Mineiro De Sousa, Kleber Cesar Alves Dept. Electrical and Computer Engineering Sobral Brazil Federal Institute of Caera Dept. Control and Industrial Processes Sobral Brazil

ISBN: (纸本)9798350321128

This work presents the study and development of a high-gain hybrid DC-DC converter with switched capacitor for photovoltaic energy applications. Qualitative analyzes and quantitative values of the converter are proposed. The proposed converter is based on the converter boost integrated into switched capacitive cells with the addition of a small inductor resonant. A mathematical modeling of the converter was developed to determine the value of the resonant inductance, where the converter was analyzed for inductance values of 1uH at 2uH. This proposal presented some advantages: such as extended static gain, reduction of voltage stress in semiconductors and reduction of current peaks in switches. A 200 W prototype was developed and its respective results are presented. Maximum efficiency obtained was 97.1% for a voltage gain of 10. © 2023 IEEE.

关键词： boost converter efficiency high gain converter hybrid DC-DC converter switched capacitor

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MDCT-based perceptual hashing for compressed audio content identification

MDCT-based perceptual hashing for compressed audio content i...

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2007 IEEE 9Th International Workshop on Multimedia Signal Processing, MMSP 2007

作者： Yuhua, Jiao Bian, Yang Mingyu, Li Xiamu, Niu School of Computer Science and Technology Harbin Institute of Technology Harbin China Dept. of Automatic Test and Control Harbin Institute of Technology Harbin China

ISBN: (纸本)1424412749

In this paper, a perceptual audio hashing method in compressed domain is proposed for content identification, in which MDCT coefficients as the intermediate decoding result are selected for perceptual feature extraction and hash generation. The perceptual feature extraction is based on psychoacoustic model and exhibits good discrimination ability for different audio contents but robustness against common audio signal processing operations. Via feature extraction in the compressed domain, the MDCT-based compressed audios, such as MP3, AAC, etc., could be efficiently identified without complete decoding which facilitates those practical applications with strict requirements of memory and computational complexity, such as online audio retrieval, indexing of massive compressed audio data, audio identification by mobile phone, etc. The algorithm is highly robust against MDCT compression which is widely used in audio coding. Experiments demonstrate the effectiveness of the proposed scheme. © 2007 IEEE.

关键词： Feature extraction

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The application of a parallel genetic algorithm to timetabling of elementary school classes: A coarse grained approach

The application of a parallel genetic algorithm to timetabli...

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ICAT 2009 - 2009 22nd International Symposium on Information, Communication and Automation Technologies

作者： Šrndić, Nedim Dervišević, Mirza Pandžo, Emir Konjicija, Samim Dept. of Computer Science Faculty of Electrical Engineering Sarajevo Bosnia and Herzegovina Dept. of Control and Electronics Faculty of Electrical Engineering Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9781424442218

This paper describes the application of a Parallel Genetic Algorithm that solves the weekly timetable construction problem for elementary schools. Timetable construction is NPcomplete and highly constrained problem, and therefore represents a computationally intensive task. A Parallel Genetic Algorithm (PGA) is proposed with specific methods for chromosome representation and fitness evaluation, and specific recombination and mutation operators. The proposed solution uses a coarse grained PGA, which is suitable for execution on a Beowulf cluster. Experimental results are provided, with a comparison of serial and parallel execution times for the same algorithm. ©2009 IEEE.

关键词： Scheduling

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Evaluation of suboptimal real-time control results for model predictive control using improved initial conditions

Evaluation of suboptimal real-time control results for model...

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2005 IEEE International Conference on control Applications, CCA

作者： Milman, Ruth Davison, Edward Joseph Systems Control Group Dept. of Electrical and Computer Engineering University of Toronto

ISBN: (纸本)0780393538

In the Model Predictive control (MPC) framework a controller is computed using a finite horizon optimal control cost. When linear constraints are imposed on the system with a quadratic cost function, then the MPC problem can be reformulated as a constrained quadratic programming (QP) problem. In this paper active set methods are used in order to solve the QP problem associated with MPC, and it is shown that it is possible to use information from the previous sample interval in order to provide improved initial conditions for the QP problem which is applied to the subsequent sample interval. Simulations show that when real-time considerations force the used of suboptimal intermediate control values, then improved initial conditions can allow for control values which are closer to the true optimal solution than obtained when using standard initial conditions. These ideas can allow for the implementation of MPC schemes on a greater number of real industrial applications, where standard MPC control cannot be applied due to the excessive CPU time requirements. © 2005 IEEE.

关键词： Real time systems

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