Archives of Control Sciences

Items from 1 to 20 out of 743 results

article

Parametric minimization of influence of stochastic didtribution in linear systems

T. Banek

Archives of Control Sciences > 1998 > Vol. 7, no. 1/2 > 99-104

A structure optimization problem in linear systems is considered. It is shown that parametric minimization (in the mean square sense) of influence of stochastic disturbation can be reduced to some nonlinear programming problem. Sufficient condition for equivalence of these problems and existence of their solutions are given. It is also shown how to apply the results to controlled systems.

article

Controllability of a generalized linear control system

H. Wysocki

Archives of Control Sciences > 1998 > Vol. 7, no. 1/2 > 43-67

In this paper, a definition of controllability of a generalized linear differential control system is introduced using the Bittner operational calculus. Controllability criteria are also discussed. Adequate examples in various models of the operational calculus are given.

article

An evolutionary method of trajectory planning in collision situations at sea

R. Śmierzchalski

Archives of Control Sciences > 1998 > Vol. 7, no. 1/2 > 5-32

In a collision situation at sea, the decision support system should help the operator to choose a proper manoeuvre in given circumstances, teach him good practices, and enhance his general intuition on how to behave in similar situations in future. An accepted approach in those cases is a multiple criterion decision problem. In this paper, a modified version of the EP/N (Evolutionary Planner/Navigator)...

article

A neuro-fuzzy approach to system modelling. Part I. Methodology

M. B. Gorzałczany

Archives of Control Sciences > 1998 > Vol. 7, no. 1/2 > 121-140

Description of behaviour of complex and ill-defined systems and processes is usually based on a combination of two types of knowledge and data: a qualitative, fuzzy knowledge which contains elements of uncertainty and vagueness, and often is expressed in the form of linguistic rules usually provided by a domain expert, and quantitative, nonfuzzy information which appears in the form of measurements...

article

Discrete-averaged mathematical models of neutral delay systems

W. Kozera

Archives of Control Sciences > 1998 > Vol. 7, no. 1/2 > 105-120

This article presents a method of determining discrete-averaged mathematical models of multi-input multi-output (MIMO) linear time-invariant systems with constant commensurate delays characterized by a finite-dimensional subspace of antistable states. The proposed method generalizes the, presented in works [10 - 13], methods of determining models for retarded-delay systems to include systems of neutral...

article

On reducing the order ot the stabilizing compensator for a linear multivariable plant

R. Ładziński

Archives of Control Sciences > 1998 > Vol. 7, no. 1/2 > 69-98

The text covers an in-depth study on the order of the compensator applied in a feedback system for stabilization of the linear, time-invariant, n-th order, multivariable plant. It is shown that all such compensators evolve from the n-th order structure depicted in two forms in Fig. 2 (dotted lines). Presentation includes the so-called reduced and subreduced order compensators and the case of a static...

article

Some remarks on pole assignability of distributed parameter systems

T. Kobayashi

Archives of Control Sciences > 1998 > Vol. 7, no. 1/2 > 33-41

The pole assignment problem of distributed parameter systems with unbounded feedback is discussed. The problem can be solved under a weaker restriction between the open-loop poles { lambda /sub n/} and the closed-loop poles { beta /sub n/}. Two types of the expression of a characteristic equation whose roots are the closed-loop poles are first given. Next a feedback element is given which realizes...

article

Automatic generation control of multi area interconnected power system considering nonlinearity due to governor dead band

A. Panda

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 285-299

The paper focuses on the problem of automatic generation control of multi area power system considering nonlinearity due to governor dead band. The objective of this work is to develop a mathematical model and method of solution to study the dynamic response and to present an optimization method to choose the optimal gain setting of the load frequency controller. A method, called decomposition technique...

article

The central control accuracy theorem for internal model control and its applications

K. Latawiec, C. Marciak, J. Wrzuszczak

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 227-239

The well-known feature of the Internal Model Control (IMC) structure, providing steady-state error-free servo and regulatory controls for step-wise forcing signals, is generalized by what is termed the "central IMC theorem". The generalization consists not only in the original extension of the SISO and square MIMO results to nonsquare MIMO systems, but mainly in redeveloping certain IMC...

article

On some characterization of invariant and decoupling zeros of singular systems

J. Tokarzewski

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 145-159

In this paper a geometric characterization of invariant and decoupling zeros of a generalized state-space model described by the matrix 5-tuple (E,A,B,C,D), where E is singular but the pencil sE-A is regular, is presented. These zeros are characterized as invariant zeros of an appropriate linear system S(A,B,C,D). Several numerical examples are included to illustrate the proposed results as well as...

article

An outline of the linear control system synthesis by a proper, stable rational functions approach

R. Ładziński

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 241-265

In the process of designing controllers for linear multivariable plants specially effective are algebraic methods which require from the transfer matrices of both, the plant and the controller to be presented in coprime fractional form with factorization carried on with respect to the ring of exponentially-stable, proper real-rational functions. The main objective of the paper is to show that this...

article

Optimal design of control law under uncertainty by dynamic programming

M. Siomak, K. Malinowski

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 202-226

In this paper various aspects of the realization of the dynamic programming algorithm are presented. Particular attention is focused on computational efficiency, which is obtained by presented discretization, approximation and parallelization techniques. Numerical solutions of some examples are briefly described and discussed. The last part presents a particular approach to handle stochastic constraints...

article

A neuro-fuzzy approach to system modelling. Part II. Applications

M. B. Gorzałczany

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 267-284

The description of behaviour of complex and ill-defined systems and processes is usually based on a combination of two types of knowledge and data: a qualitative, fuzzy knowledge which contains elements of uncertainty and vagueness and often is expressed in the form of linguistic rules usually provided by a domain expert, and a quantitative, nonfuzzy information which appears in the form of measurements...

article

Diagnostics of processes in decentralized structures

J. M. Kościelny

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 181-202

The paper presents rules for diagnosis formulation in hierarchical systems. The rules can be applied in industrial process diagnostics realized in decentralized structures. Formalized description of an object of diagnosis as well as general rules for diagnosis formulation have been presented in the paper. The method of hierarchical description of the object of diagnosis has been given. Decentralized...

article

The use of the MTS method for programming of Simatic S7-200 controllers

T. Mikulczyński, Z. Samsonowicz, R. Więcławek

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 301-319

An outline of the method of net transformation (MTS) designed by the authors for modelling discrete processes and programming PLCs is presented. Characteristics of Simatic S7-200 controller, which is a representative of a new family of Simatic S7 controllers from Siemens, are provided. The use of the MTS for the programming of PLCs is described and illustrated with the modelling of a real (model)...

article

Location problems from the multiple criteria perspective: efficient solutions

W. Ogryczak

Archives of Control Sciences > 1998 > Vol. 7, no. 3/4 > 161-180

Location problems can be considered as multiple criteria models where for each client (spatial unit) there is defined an individual objective function, which measures quality of a location pattern with respect to the client satisfaction (e.g. it expresses the distance or travel time between the client and the assigned facility). The individual objective functions are usually conflicting when optimized...

article

A model of dynamics of mutation, genetic drift and recombination in DNA-repeat genetic loci

J. Polańska, M. Kimmel

Archives of Control Sciences > 1999 > Vol. 9, no. 1/2 > 143-157

We present a model of genetic dynamics of a population of chromosomes, involving mutation, drift and recombination at a pair of repeat-DNA sequences. Such sequences, known as microsatellites and VNTR's, are commonly used as markers in studies in forensics, molecular evolution and gene mapping. The model we use has the form of a time-continuous Markov chain. It is further transformed to the form of...

article

A Model for estimating cell kinetic parameters of experimental tumours studied by BrdUrd labelling and flow cytometry

A. Bertuzzi, A. Gandolfi

Archives of Control Sciences > 1999 > Vol. 9, no. 1/2 > 41-56

A mathematical model that describes the time evolution of the DNA-BrdUrd distribution, as measured in experimental tumours after labelling with BrdUrd, is proposed in this paper. Cell-to-cell heterogeneity within the tumour of the rate of progression across cell cycle phases is taken into account, and a strict correlation between the durations of S and G2M phases is assumed. The model relates observable...

article

A Neuro-Fuzzy System Using Logical Interpretation of If-Then Rules and its Application to Diabetes Mellitus Forecasting

J. Łęski, N. Henzel

Archives of Control Sciences > 1999 > Vol. 9, no. 1/2 > 107-122

Initially, an axiomatic definition of fuzzy implication has been recalled. Next, several important fuzzy implications and their properties have been described. Then, the idea of approximate reasoning using generalized modus ponens and fuzzy implication are considered. After reviewing well-known fuzzy systems, a new Artificial Neural network Based on Logical Interpretation of if-then Rules (ANBLIR)...

article

HIV Testing as an Effective Control Strategy against the Spread of AIDS among Intravenous Drug Users

F. Lewis, D. Greenhalgh

Archives of Control Sciences > 1999 > Vol. 9, no. 1/2 > 69-96

In this article we examine the impact on the spread of HIV caused by regularly testing members of a needle sharing population for the presence of disease. We develop a model of injecting drug use which contains two classes of addicts, a class who are unaware of their infectious status and a class who are aware that they are infectious through having had an HIV test. We expect addicts in the latter...

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Archives of Control Sciences

Parametric minimization of influence of stochastic didtribution in linear systems

Controllability of a generalized linear control system

An evolutionary method of trajectory planning in collision situations at sea

A neuro-fuzzy approach to system modelling. Part I. Methodology

Discrete-averaged mathematical models of neutral delay systems

On reducing the order ot the stabilizing compensator for a linear multivariable plant

Some remarks on pole assignability of distributed parameter systems

Automatic generation control of multi area interconnected power system considering nonlinearity due to governor dead band

The central control accuracy theorem for internal model control and its applications

On some characterization of invariant and decoupling zeros of singular systems

An outline of the linear control system synthesis by a proper, stable rational functions approach

Optimal design of control law under uncertainty by dynamic programming

A neuro-fuzzy approach to system modelling. Part II. Applications

Diagnostics of processes in decentralized structures

The use of the MTS method for programming of Simatic S7-200 controllers

Location problems from the multiple criteria perspective: efficient solutions

A model of dynamics of mutation, genetic drift and recombination in DNA-repeat genetic loci

A Model for estimating cell kinetic parameters of experimental tumours studied by BrdUrd labelling and flow cytometry

A Neuro-Fuzzy System Using Logical Interpretation of If-Then Rules and its Application to Diabetes Mellitus Forecasting

HIV Testing as an Effective Control Strategy against the Spread of AIDS among Intravenous Drug Users

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