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IEEE International conference on Systems, Man and Cybernetics

作者： E.J. Singh N. Kaur Department of Electronics & Communication Engineering Guru Nanak Dev University Amritsar India Department of Electronics & Communication Engineering College of Engineering and Technology Jalgaon Maharashtra India

Data and models are needed to analyse the dynamic behaviour of any system. One of the main goals of mathematical modelling is optimization of some objective function subject to certain constraints. Nature has an optimality principle in biological systems. For example shapes of different cells or bones in the human body are optimal for the function they perform. Optimization models may provide better understanding in diagnosis of diseases as well as in patient health care systems. The paper deals with application of the optimization technique of dynamic programming to model the human gall bladder.

关键词： humans Bladder Medical services Biological system modeling mathematical model Constraint optimization Biological systems Shape Bone diseases Dynamic programming

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modelling the behaviour of a new track system when subjected to vibration

Modelling the behaviour of a new track system when subjected...

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Proceedings of the 1996 3rd Biennial Joint conference on engineering Systems Design and Analysis, ESDA. Part 7 (of 9)

作者： Lesley, Lewis Liverpool J.M. Univ Liverpool United Kingdom

Buildings and structures adjacent to railways are subjected to vibration generated in the track and transmitted through the ground. These vibration phenomena have been researched for conventional railway tracks and the effect on human subjects well understood. Railways or tramways built in city streets are usually much closer to buildings than conventional railways. Therefore the generation and transmission of vibration is more critical in tramway tracks. This paper examines work undertaken to identify the mechanism for generating vibration at the rail head, and applies it to the new LR55 track system. A model is created to determine the path of vibrations from the rail head through the new LR55 track structure and into the ground. Knowing the vibrations which are transmitted into the ground enables an assessment to be made of the impacts on adjacent buildings.

关键词： Railroad tracks

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Automated mathematical modelling for financial time series prediction using fuzzy logic, dynamical systems and fractal theory

Automated mathematical modelling for financial time series p...

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Proceedings of the IEEE/IAFE Computational Intelligence for Financial engineering (CIFEr)

作者： O. Castillo P. Melin Dept. of Econ. UABC Univ. USA

We describe a new method for performing automated mathematical modelling for financial time series prediction using fuzzy logic techniques, dynamical systems and fractal theory. The main idea is that using fuzzy logic techniques we can simulate and automate the reasoning process of human experts in mathematical modelling for financial time series prediction. Our new method for automated modelling consists of three main parts: time series analysis, developing a set of admissible models, and selecting the "best" model. Our method for time series analysis consists of using the fractal dimension of a set of points as a measure of the geometrical complexity of the time series. Our method for developing a set of admissible dynamical systems models is based on the use of fuzzy logic techniques to simulate the decision process of the human experts in modelling financial problems. The selection of the "best" model for financial time series prediction (FTSP) is done using heuristics from the experts and statistical calculations. This new method can be implemented as a computer program and can be considered an intelligent system for automated mathematical modelling for FTSP.

关键词： mathematical model Fuzzy logic Fractals Predictive models Intelligent systems Artificial intelligence humans Time series analysis Computational modeling Statistical analysis

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On the error criteria in neural networks as a tool for human classification modelling

On the error criteria in neural networks as a tool for human...

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International conference on Spoken Language, ICSLP

作者： L. ten Bosch R. Smits Lernout and Hauspie Speech Products N. V. Ieper Belgium Institute of Phonetic Sciences IFOTT University of Amsterdam Netherlands Phonetics Department University College London London UK

Multi layer perceptrons (MLPs) can be applied as a tool to model human classification behaviour. In the present theoretical study we attempt to interpret MLPs within the framework of mathematical psychological models for human classification behaviour, more specifically the general recognition theory and the generalized context model. Next, four error criteria are discussed that can be used in training and test of the MLPs, in relation to two types of data representation: in terms of individual deterministic responses or in terms of probabilistic responses. All error measures considered are additive, i.e. can be written as a sum across individual stimuli. It is shown that some of these error measures have very different properties given a training set, and that the interpretation of the MLP as a means to provide knowledge about the underlying human decision process depends on the complexity of the MLP-topology.

关键词： Intelligent networks Neural networks humans Context modeling mathematical model Psychology Speech Electronic mail Testing Additives

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An uncoupled oscillator model for evoked potential dynamical modelling

An uncoupled oscillator model for evoked potential dynamical...

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Annual International conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： R.B. Reilly T.E. Ward A.M. dePaor Department of Electronic and Electrical Engineering University College Dublin Ireland University College Dublin Dublin IE

A mathematical model for evoked potentials is outlined. The model has been developed by considering phase synchronisation of the underlying neurological processes. The model, consisting of an ensemble of uncoupled linear oscillators with a gaussian distribution of frequencies is shown to reproduce the typical response of P100 visual evoked response. The model structure is parallel in form and is considered to be physiologically realistic. It is also shown that the calculated behaviour of the ensemble can be generated by a 2/sup nd/ order linear differential equation with time varying coefficients, thus highlighting the fact that entirely different physical structures can generate identical responses.

关键词： Oscillators Electroencephalography Frequency synchronization Differential equations mathematical model Brain modeling Random variables Phase noise Phase measurement Probability density function

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Maintaining temporal consistency of multimedia documents using constraint networks

Maintaining temporal consistency of multimedia documents usi...

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conference on Multimedia Computing and Networking 1996

作者： Layaida, N SabryIsmail, L INRIA RHONE ALPES OPERA PROJECTF-38610 GIERESFRANCE

ISBN: (纸本)0819420417

The recent advances in multimedia systems, together with the advent of high speed networks, paved the way to a new generation of applications. In particular, the authoring environments have found in multimedia the means of increasing the richness of information contained in electronic documents. With the evolution of new computer systems that can handle multimedia information, time-based data can be integrated in electronic documents taking into account their temporal dimension. In such documents, temporal dependencies between the different media objects define a temporal structure within the document. This structure is the basic support for the representation of dependencies between data such as audio, video and virtual images. Furthermore, it allows the scheduling of presentation actions during the document presentation. The presentation of multimedia documents is dynamic and the positioning of objects in time together with their duration have to be specified. To achieve this operation efficiently, a high level temporal representation is needed which allows the author to specify all the temporal dependencies between multimedia objects. In this paper, we propose an interval-based temporal model and constraints which provide a basis for the management of the consistency of multimedia documents. We propose an efficient algorithm allowing the detection of a wide range of inconsistencies. The emphasis in the design of these algorithms is put on the handling of both the flexibility of temporal specifications and the indeterministic behaviour of some media objects. Furthermore, we use the logical organization of the document in nested entities to enhance the performance of the methods used for detecting inconsistencies. The aim of our approach is to fulfill the following requirements . Structured modelling: The document content is defined by a hierarchy of nested components where leaves are basic media objects and nodes composite objects. . Incremental manipulation of th

关键词： Multimedia Chlorine Composites Video Visualization Computing systems Data processing human-machine interfaces Data integration Pollution control

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modelling of energy use patterns in the residential sector using linguistic variables

Modelling of energy use patterns in the residential sector u...

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International conference on Intelligent Systems Applications to Power Systems (ISAP)

作者： G. Michalik W. Mielczarski Centre for Electrical Power Engineering Monash University Clayton VIC Australia

This paper presents some results from a project aimed at the development of characteristic patterns of energy use based on structural models of energy consumption. The structure of the models developed allows an analysis of demand side management (DSM) impact and future demand. This paper is focused on the application of fuzzy filters in transferring linguistic variables expressed in terms of common words into mathematical operators. These linguistic variables appear when customers describe their behaviour and life styles. The fuzzy filters used not only transfer linguistic variables into computerised forms but they also map uncertainty from linguistic data into filter parameters.

关键词： Load modeling Uncertainty Home appliances Filters Shape measurement Educational institutions Energy consumption Psychology Power engineering Australia

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mathematical modelling of the human cardiovascular system during an exercise test of the lower limbs and the recuperation phase

Mathematical modelling of the human cardiovascular system du...

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Annual International conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： J.-L. Lacaze E. Menigault P. Vieyres B. Lepoivre L. Pourcelot Fac. de Med. GIP Ultrasons Tours France Faculté de Médecine Unité INSERM 316 Tours France Laboratorie Vision et Robotique Bourges France Faculté de Médecine GIP Ultrasons Tours France

The primary role of the cardiovascular system is to deliver a required amount of oxygen to various organs. These needs vary with time and depend on the vascular site. To maintain a required diffusion level of oxygen in the capillary networks, the cardiovascular system is controlled by regulation processes that maintain pressure and blood flow to the required physiological levels. The authors have developed a nonlinear hemodynamic model associated with a varying elastance model of the heart and four simple control processes acting on the heart rate and the vascular resistances. The computed results, showing variations of arterial mean pressure, heart rate and vascular resistances agree with the experimental data under resting conditions, during moderate exercise of 200 W and during the recuperation phase.

关键词： mathematical model humans Cardiovascular system System testing Blood flow Bifurcation Heart rate Immune system Pressure control Process control

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CONTROLLER-DESIGN FOR AN UNKNOWN PROCESS, USING SIMULATION OF A human OPERATOR

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engineering APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1995年第3期8卷 299-308页

作者： ENAB, YM University of Surrey U.K.

The reason for the present upsurge of interest in intelligent control is that the present generation of control systems are incapable, to a greater or lesser extent, of dealing with problems of a certain complexity. Fortunately, human operators (HO) are often experts in keeping the complex control systems on the right track. In this paper a method for controller design has been investigated, based on a concept of developing a mathematical model for the behaviour of the HO of the process. This method treats the HO's behaviour as a dynamic process in itself, transformed from the dynamics of the unknown process to be controlled. The following three phases are distinguished in controller design: (i) Observation phase, during which the HO controls the process by himself for a specific time interval. During this time the data representing the state of the process and the corresponding human controller actions are registered. (ii) modelling phase, during which the mapping between the inputs and the outputs of the controller is learned. The model used is a neural network with radial basis functions, and the estimation of the model parameters is conducted by using a multiparameter least-square estimation. (iii) Testing phase, during which the human operator behaviour model or the derived neural controller is used to control the process. The controller performance is evaluated by analysing its behaviour under both the same conditions used in learning phase, and completely different conditions to study the controller reliability. The method has been successfully applied to control a nonlinear level-control process using computer simulation.

关键词： MANUAL CONTROL MODELING NEURAL NETWORKS LEARNING SYSTEMS PROCESS CONTROL MODEL IDENTIFICATION MAN-MACHINE SYSTEMS

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human operator behaviour modelling using nonlinear identification techniques

Human operator behaviour modelling using nonlinear identific...

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Proceedings of the 1995 IEEE Instrumentation and Measurement Technology conference

作者： Enab, Yehia M. El-Mansoura Univ Egypt

The reason for the present upsurge of interest in intelligent control is that the present generation of control systems are incapable, to a greater or less extent, of dealing with problems of a certain complexity. Fortunately, human operators are often experts in keeping the complex control systems on the right track. In this paper a method for controller design has been investigated based on a concept of developing a mathematical model for the behaviour of the human operator of the process. This method treats the human operator behaviour as a dynamic process by itself, transformed from the dynamics of the unknown process to be controlled. There are three phases for controller design, observation, modelling and testing phases during which the available observed data are used for training the system and testing it. The method has been successfully applied to control a nonlinear process using computer simulation.

关键词： Control system synthesis

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