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Neural-fuzzy modelling of lung volume using absolute electrical impedance tomography

Neural-fuzzy modelling of lung volume using absolute electri...

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作者： Samuri, Suzani Mohamad Panoutsos, George Mahfouf, Mahdi Mills, G.H. Denaï, M. Brown, B.H. Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom Dept. of Critical Care and Anaesthesia Northern General Hospital Sheffield United Kingdom School of Science and Eng. Teesside University Middlesbrough United Kingdom Dept. of Medical Physics Royal Hallamshire Hospital Sheffield United Kingdom

ISBN: (纸本)9789898425355

Electrical Impedance Tomography (EIT) has been the subject of intensive research since its development in the early 1980s by Barber and Brown at the Department of Medical Physics and Clinical engineering, Hallamshire Hospital in Sheffield (UK). In particular, pulmonary measurement has been the focus of most EIT related research. One of the relatively recent advances in EIT is the development of an absolute EIT system (aEIT) which can estimate absolute values of lung resistivity and lung volumes. However, there is still active research in the area of validating and improving the accuracy and consistency of the aEIT estimation of lung volumes towards characterising the system as suitable for clinical use. In this paper we present a new approach based on Computational Intelligence (CI) modelling to model the 'Resistivity - Lung Volume' relationship that will allow more accurate lung volume predictions. Eight (8) healthy volunteers were measured simultaneously by the Sheffield aEIT system and a Spirometer and the recorded results were used to develop subject-specific Neural-Fuzzy models able to predict absolute values of lung volume based only on absolute lung resistivity data. The developed models show improved accuracy in the prediction of lung volumes, as compared with the original Sheffield aEIT system. However the interindividual differences observed in the subject-specific modelling behaviour of the 'Resistivity-Lung Volume' curves suggest that a model extension is needed, whereby the modelling structure auto-calibrates to account for subject (or patient-specific) inter-parameter variability.

关键词： Forecasting

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An interpolation approach for robust constrained output feedback

An interpolation approach for robust constrained output feed...

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IEEE Conference on Decision and control

作者： H.-N. Nguyen P.-O. Gutman S. Olaru M. Hovd SUPELEC Systems Sciences (E3S) - Automatic Control Dept. France Faculty of Civil and Environmental Engineering Technion - Israel Institute of Technology Department of Engineering Cybernetics Norwegian University of Science and Technology

ISBN: (纸本)9781612848006

In this paper, we consider the regulation problem for uncertain linear discrete time systems with bounded disturbance, bounded input and bounded output. Based on the input-output representation, an extended state space model is constructed via the delayed inputs and outputs of the systems and hence there is no need for any estimate of the unmeasured states. The control is obtained using an interpolation technique, which assures feasibility and a robustly asymptotically stable closed loop behavior.

关键词： Robustness Interpolation Ellipsoids Lyapunov methods Uncertainty Linear programming Minimization

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Securing JPEG architecture based on enhanced chaotic hill cipher algorithm

Securing JPEG architecture based on enhanced chaotic hill ci...

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International Conference on computer engineering and systems

作者： Ghada Hamissa Amany Sarhan Hatem Abdelkader Mahmoud Fahmy Electrical Engineering Dept. Faculty of Engineering KFS University Kafr-Elsheikh Egypt Information System Department Faculty ofComputer & Information Menoufia University Menoufia Egypt Computer & Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt

In the last two decades, Chaos theory has received a great deal of attention from the cryptographic community. This paper presents two ideas. First idea is using chaotic functions to overcome the weaknesses of the classical Hill cipher. The second idea is proposing a new encoder-decoder architecture, called ChaoEncoDeco, for securing JPEG images. An extra stage of encryption is embedded within the traditional JPEG codec to improve security level of such system. This security stage uses one of the chaotic functions called Logistic Map. This map is used to enhance the Hill cipher and achieve more secure encryption key. The properties of both chaotic system and of the Hill cipher encryption key are all utilized to obtain ultimate secure systems. The proposed encryption algorithm is crypto-analyzed and compared to the standard Hill cipher algorithm. Complete evaluation for the proposed architecture is also performed which indicates the effectiveness of the proposed system.

关键词： Cryptography Image coding Chaos PSNR Transform coding Time measurement Size measurement

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Facilitating independent learning of control basics

Facilitating independent learning of control basics

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UKACC International Conference on control 2010

作者： Rossiter, J.A. Dept. of Automatic Control and Systems Engineering Univ. of Sheffield S. Yorks S1 3JD United Kingdom

ISBN: (纸本)9781846000386

This paper focuses on how to help students engage better with control courses and to learn through doing. In parallel it discusses strategies for encouraging more independent learning into the curriculum. Two main assumptions are made: (i) first that module design needs to embed regular student activity and (ii) student activity mostly involve more than engagement with what is covered in formal lectures. The paper is completed by student evaluations of a large group of students from three different engineering departments.

关键词： Students

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A genetic approach to optimize the coverage performance of multiple random path-planning robots

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12th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2009

作者： Habib, Ahsan Alam, M.S. Aldebrez, F.M. Siddique, N.H. Dept. of Applied Physics Electronics and Communication Engineering University of Dhaka Bangladesh Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom School of Computing and Intelligent Systems University of Ulster United Kingdom

ISBN: (纸本)9814291269

This paper presents a new approach to multi-agent coverage path planning problem. This algorithm enables multiple robots with limited sensor capabilities to perform coverage efficiently over a shared territory. Each robot is assigned with an exclusive route, which enables it to carry out its cleaning process simultaneously with minimal path overlapping. The objectives of this work are (i) Identify a path for each robot such that each robot is responsible for covering a different region. In this way, there will be minimal overlap between coverage of the robots, (ii) the methods and procedures must be applicable to a group of simple mobile robots with very few sensors to guarantee their industrial interest.

关键词： Motion planning

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Damping structure selection in nonlinear ship manoeuvring models

Damping structure selection in nonlinear ship manoeuvring mo...

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作者： Perez, Tristan Revestido-Herrero, Elías School of Engineering Discipline of Mechanics and Mechatronics University of Newcastle Callaghan NSW 2308 Australia Trondheim Norway Dept. of Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

ISBN: (纸本)9783902661883

This paper presents the application of a statistical method for model structure selection of lift-drag and viscous damping components in ship manoeuvring models. The damping model is posed as a family of linear stochastic models, which is postulated based on previous work in the literature. Then a nested test of hypothesis problem is considered. The testing reduces to a recursive comparison of two competing models, for which optimal tests in the Neyman sense exist. The method yields a preferred model structure and its initial parameter estimates. Alternatively, the method can give a reduced set of likely models. Using simulated data we study how the selection method performs when there is both uncorrelated and correlated noise in the measurements. The first case is related to instrumentation noise, whereas the second case is related to spurious wave-induced motion often present during sea trials. We then consider the model structure selection of a modern high-speed trimaran ferry from full scale trial data. © 2010 IFAC.

关键词： Regression analysis

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RETRACTED ARTICLE: Dynamic feedback equalization algorithm for minimum weight

RETRACTED ARTICLE: Dynamic feedback equalization algorithm f...

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作者： Song, Shouyun Xu, Junpeng Cong, Qing Dept. of Automatic Control Department Henan Mechanical and Electrical Engineering College Xinxiang Henan China Dept. of Mechanical Engineering Henan Institute of Science and Technology Xinxiang Henan China Dept. of Computer and Information Technology Henan University Kaifeng Henan China

ISBN: (纸本)9781424455386

the paper analyzes the existing Linux virtual server (LVS) cluster load balancing algorithm and its inadequacies that not real-time dynamic full makes an appraisal to the load on the each server node, designs a new Dynamic Feedback Equalization Algorithm for Minimum Weight. The algorithm considers real-time load and response capacity of each server node, makes pre-load rate of the server combined with response time, dynamic generates server node weights by real-time feedback and conducts adjust to the load balancing of server cluster by using Minimum weight balancing algorithm. This algorithm has done a comparison with the Weighted Least Connections, theory analysis and experimental results show that the improved dynamic load balancing algorithm is more effective than Weighted Least Connections. © 2010 IEEE.

关键词： Clustering algorithms

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A nonlinear model predictive control scheme with multirate integral sliding mode

A nonlinear model predictive control scheme with multirate i...

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作者： Rubagotti, Matteo Raimondo, Davide M. Jones, Colin N. Magni, Lalo Ferrara, Antonella Morari, Manfred Dept. of Mechanical and Structural Engineering University of Trento Via Mesiano 77 38123 Trento Italy Automatic Control Laboratory ETH Zürich Physikstrasse 3 8092 Zürich Switzerland Dept. of Computer Engineering and Systems Science University of Pavia Via Ferrata 1 27100 Pavia Italy

ISBN: (纸本)9783902661807

In this paper, a hierarchical multirate control scheme for nonlinear discrete-time systems is proposed, composed of a robust model predictive controller (MPC) and a multirate integral sliding mode (MISM) controller. In particular, the MISM controller acts at a faster sampling time than the MPC controller, and reduces the effect of model uncertainties and external disturbances, in order to obtain, at the next sampling instant of the MPC controller, a value of the system state that is as close as possible to the nominal one. To obtain this result, the control variable is composed of two parts: one generated by the MPC controller, and the other by the MISM controller. The a-priori reduction of the disturbance terms turns out to be very useful in order to improve the convergence properties of the MPC controller. © 2010 IFAC.

关键词： controllers

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Parameter estimation of thrust models of uninhabited airborne systems

Parameter estimation of thrust models of uninhabited airborn...

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作者： Perez, Tristan De Lamberterie, Pierre Donaire, Alejandro Herrero, Elias Revestido School of Engineering Discipline of Mechanics and Mechatronics University of Newcastle Callaghan NSW 2308 Australia University of Newcastle Callaghan NSW 2308 Australia Dept. of Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

ISBN: (纸本)9783902661876

This paper presents a method for the estimation of thrust model parameters of uninhabited airborne systems using specific flight tests. Particular tests are proposed to simplify the estimation. The proposed estimation method is based on three steps. The first step uses a regression model in which the thrust is assumed constant. This allows us to obtain biased initial estimates of the aerodynamic coefficients of the surge model. In the second step, a robust nonlinear state estimator is implemented using the initial parameter estimates, and the model is augmented by considering the thrust as random walk. In the third step, the estimate of the thrust obtained by the observer is used to fit a polynomial model in terms of the propeller advanced ratio. We consider a numerical example based on Monte-Carlo simulations to quantify the sampling properties of the proposed estimator given realistic flight conditions.

关键词： Parameter estimation

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A technology to simultaneously produce clean hydrogen and iron powder

A technology to simultaneously produce clean hydrogen and ir...

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作者： George, Stefanoiu Horatiu Octavian, Stanasila Corneliu, Stanasila Virgil Dan, Stefanoiu Bioterra University of Bucharest Dept. of Chemistry Romania Politehnica University of Bucharest Dept. of Applied Sciences Romania Technical University of Civil Engineering Bucharest Romania Politehnica University of Bucharest Dept. of Automatic Control and Computer Science Romania

ISBN: (纸本)9789604742271

The redox steam-iron process, which has been discovered in the early 1900's, was finally abandoned because the degradation of the iron oxide ores within a few cycles. Recently, this process has been reconsidered, due to the necessity to yield cheap and pure hydrogen. In this article, we introduce a related but improved technology. At the first stage, the inlet iron oxide for the steam-iron process is the hematite, which has to be reduced to metallic iron in a gasifier called HG, by using syngas from coke (or cellulose). The hydrogen is then produced in a cyclic process, based upon the reduction of metallic iron by means of steam. At the second stage, another hematite, at any granulation, is reduced to iron powder in a reactor called IPR, at about 570°C by using the hydrogen of HG.

关键词： Heat transfer

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