Improving Stability in Developing Nations through Automation 2006, 2006
ABSTRACT This paper discusses the fuzzy decision making under the theory-of-constraints (TOC) for... more ABSTRACT This paper discusses the fuzzy decision making under the theory-of-constraints (TOC) for the product-mix problem. It utilizes a smooth logistic membership function for finding out the fuzziness patterns in the disparate level of satisfaction. This membership function has been validated for applying to the real-world product-mix problems. This contribution provides a robust, quantified monitoring of the level of satisfaction among the decision makers, and calibrates these levels of satisfaction against the decision-makers expectations. It thus provides a computational intelligence procedure. The solution by Hsu and Chung via the dominance-rule technique yields the optimal throughput as US $ 11,873, which is identical to the solution found by the fuzzy-logic-programming (FLP) methodology, and is considered to be better suited for the product-mix-selection problems. The flexibility of the model lies in the membership function design. The chapter concludes by discussing the inefficiency of the traditional linear programming in handling the multiple bottleneck problems, through the TOC concept via an illustrative example.
The 2006 IEEE International Joint Conference on Neural Network Proceedings, 2006
The recent emerging trend in financial systems engineering relies on exploiting soft-computing te... more The recent emerging trend in financial systems engineering relies on exploiting soft-computing technologies, and on employing neural-nets techniques, in particular. Simultaneously, recent empirical studies on economic stabilization programs implemented worldwide have clearly demonstrated that, after the successful disinflation, the inflationary process can no longer be captured and explained using the traditional variables and models provided by economic theory. This paper
The experience from and recorded observations on economy stabilization programs implemented world... more The experience from and recorded observations on economy stabilization programs implemented worldwide have clearly shown that there is sharp difference between the inflation dynamics during the implementation of such programs and the one during the post-stabilization period. In this context, it is observed that after the successful disinflation, the inflationary process can no longer be explained using the traditional variables provided by the standard theory of economy. Following these empirically established regularity phenomena, this paper explores the possibility of identification of the inflation process dynamics via of the system-theoretic, by means of both the traditional statistics and Box-Jenkins ARIMA methodologies. The application of this a theoretic approach is on the modelling of real inflation dynamics in Rep. of Macedonia in the post-stabilization period, second half of the 1990s.
This paper deals with problems on system decomposition of composite linear dynamical systems by e... more This paper deals with problems on system decomposition of composite linear dynamical systems by exploiting the similarity property. System decompositions are sought in terms of similarity hierarchical structures. The method for constructing the transformation is derived. The conditions for such decomposition of composite systems are given.
From the very beginning of computer systems and networks, there has been a severe lack of analyti... more From the very beginning of computer systems and networks, there has been a severe lack of analytical techniques enabling effective performance evaluation/prediction for actual systems and networks. Such techniques were needed, in particular, for the systems developed in rather poorly countries where the hardware available for the designers was obsolete in comparison to that available in well developed countries. The paper describes some experience in ICT system modeling and the network modeling tool and technique worked out.
The H∞ control of a class of the uncertain switched nonlinear cascaded systems with time delay is... more The H∞ control of a class of the uncertain switched nonlinear cascaded systems with time delay is explored in this paper via the multiple Lyapunov functions. The considered systems are assumed to comprise an inherently nonlinear and a linearizable nonlinear dynamic system that may be non-minimum phase. A group of partial differential inequalities containing adjustable functions are used in the control design task. The state feedback controllers and a suitable switching law are designed simultaneously so as to achieve the desired disturbance attenuation while preserving asymptotic stability for all admissible uncertainties. The partial differential inequalities are of lower dimension than general Hamilton–Jacobi inequalities, and therefore the solving process is feasible. This particular technique is applicable even if no subsystem is asymptotically stable. The non-minimum phase property is compensated for by means of an appropriate switching mechanism. A robust H∞ control for non-sw...
This paper discusses the stability analysis for a class of switched neutral systems with none of ... more This paper discusses the stability analysis for a class of switched neutral systems with none of the individual subsystems asymptotically stable. By employing a multiple generalized Lyapunov functional method and a free-weighting matrix technique, a delay-dependent stability criterion under a designed hysteresis switching law is developed in terms of linear matrix inequalities (LMIs). Finally, a simulation example is given to illustrate the effectiveness of the proposed method.
This paper presents a controller design method for dealing with the induced ℒ2-norm problem for s... more This paper presents a controller design method for dealing with the induced ℒ2-norm problem for switched linear parameter-varying (LPV) systems. Considering the arbitrary switchings caused by the parameters varying, a common parameter-dependent Lyapunov function is employed to derive sufficient linear matrix inequality (LMI) conditions for the switched LPV systems. A family of LPV controllers are designed according to the LMI conditions, and each of them is suitable for the corresponding parameter region. The proposed switching LPV control method is applied to an F-16 aircraft longitudinal model and simulation results demonstrate the effectiveness of the approach.
In this paper, a new global adaptive output feedback dynamic compensator is proposed for tracking... more In this paper, a new global adaptive output feedback dynamic compensator is proposed for tracking of a class of systems that are globally diffeomorphic into systems in generalized output feedback canonical form. Output-dependent nonlinearities are allowed to enter in both cases as additive and multiplicative. The system is allowed to contain unknown parameters multiplying output-dependent nonlinearities. The proposed method relies on a novel parameter estimator and state observer design methodology and the standard backstepping construction. It is shown in the paper the proposed design has three distinctive features not present in the known designs. The applicability and the effectiveness of our method are illustrated by means of respectively, a numerical example and two magnetic levitation systems which are, controlled by the coil current and the voltage applied to coil circuit
Graduate studies in fields of Engineering typically include advanced control theory. In turn, the... more Graduate studies in fields of Engineering typically include advanced control theory. In turn, these courses enhance both academic and applied research, hence contributing to combined knowledge and technology transfer, in particular if supported by industry as well. This paper reports on such fruitful experiences at our universities through the math-analytical back-stepping and state-feedback control design methodologies. Computer simulation and laboratory
The robust Hinfin control problem for the generator excitation system with the damping coefficien... more The robust Hinfin control problem for the generator excitation system with the damping coefficient uncertainty and external disturbances, is addressed. Storage functions of the control system are constructed based on modified adaptive backstepping sliding mode control method and Lyapunov method. A nonlinear robust Hinfin controller and a parameter updating law are obtained simultaneously. The controller can not only attenuate the
Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010, 2010
Abstract A sliding mode controller employing the RBF neural network is designed for the anti-lock... more Abstract A sliding mode controller employing the RBF neural network is designed for the anti-lock braking system in automotive technology according to the requirement that the braking process must be fast and robust. The usual drawback of control chattering occurred in the classical sliding mode control can be alleviated with the proposed control scheme. Also the robustness of adaptive control system employing neural network is improved to some extent. Simulation investigation for scenario of vehicle activating brakes on dry road situation is ...
2010 IEEE International Conference on Systems, Man and Cybernetics, 2010
Abstract An active queue management (AQM) scheme employing state observer and sliding mode contro... more Abstract An active queue management (AQM) scheme employing state observer and sliding mode control (SMO-SMC) is designed in this paper in order to overcome congestion problem in TCP communication networks. First, sliding mode observer is designed for input delay network system; a sufficient condition is given for the existence of such an observer in terms of linear matrix inequality. Then, on the grounds of estimated system state vector, a controller is synthesized by using the sliding-mode control theory combined with the ...
2010 IEEE International Conference on Systems, Man and Cybernetics, 2010
Abstract This paper addresses the issues of passivity and feedback equivalence for switched nonli... more Abstract This paper addresses the issues of passivity and feedback equivalence for switched nonlinear systems via multiple storage functions. The concept of storage-like functions for switched systems is presented. A sufficient condition for passivity of the switched nonlinear systems is given via multiple storage functions under some switching signal. Then, the result is extended to find conditions under which the switched system is feedback equivalent to a passive switched system.
In this paper, an integral sliding mode control (ISMC)strategy is designed for rate-based ∞ow con... more In this paper, an integral sliding mode control (ISMC)strategy is designed for rate-based ∞ow control problem in asynchronous transfer mode (ATM) networks. A novelty of this paper is the use of a transformation, which eliminates the input delays, into the ISMC technology. The control scheme guarantees stability robustness to multiple time-delays in difierent channels and changeful available bit-rate (ABR) bandwidth.
Improving Stability in Developing Nations through Automation 2006, 2006
ABSTRACT This paper discusses the fuzzy decision making under the theory-of-constraints (TOC) for... more ABSTRACT This paper discusses the fuzzy decision making under the theory-of-constraints (TOC) for the product-mix problem. It utilizes a smooth logistic membership function for finding out the fuzziness patterns in the disparate level of satisfaction. This membership function has been validated for applying to the real-world product-mix problems. This contribution provides a robust, quantified monitoring of the level of satisfaction among the decision makers, and calibrates these levels of satisfaction against the decision-makers expectations. It thus provides a computational intelligence procedure. The solution by Hsu and Chung via the dominance-rule technique yields the optimal throughput as US $ 11,873, which is identical to the solution found by the fuzzy-logic-programming (FLP) methodology, and is considered to be better suited for the product-mix-selection problems. The flexibility of the model lies in the membership function design. The chapter concludes by discussing the inefficiency of the traditional linear programming in handling the multiple bottleneck problems, through the TOC concept via an illustrative example.
The 2006 IEEE International Joint Conference on Neural Network Proceedings, 2006
The recent emerging trend in financial systems engineering relies on exploiting soft-computing te... more The recent emerging trend in financial systems engineering relies on exploiting soft-computing technologies, and on employing neural-nets techniques, in particular. Simultaneously, recent empirical studies on economic stabilization programs implemented worldwide have clearly demonstrated that, after the successful disinflation, the inflationary process can no longer be captured and explained using the traditional variables and models provided by economic theory. This paper
The experience from and recorded observations on economy stabilization programs implemented world... more The experience from and recorded observations on economy stabilization programs implemented worldwide have clearly shown that there is sharp difference between the inflation dynamics during the implementation of such programs and the one during the post-stabilization period. In this context, it is observed that after the successful disinflation, the inflationary process can no longer be explained using the traditional variables provided by the standard theory of economy. Following these empirically established regularity phenomena, this paper explores the possibility of identification of the inflation process dynamics via of the system-theoretic, by means of both the traditional statistics and Box-Jenkins ARIMA methodologies. The application of this a theoretic approach is on the modelling of real inflation dynamics in Rep. of Macedonia in the post-stabilization period, second half of the 1990s.
This paper deals with problems on system decomposition of composite linear dynamical systems by e... more This paper deals with problems on system decomposition of composite linear dynamical systems by exploiting the similarity property. System decompositions are sought in terms of similarity hierarchical structures. The method for constructing the transformation is derived. The conditions for such decomposition of composite systems are given.
From the very beginning of computer systems and networks, there has been a severe lack of analyti... more From the very beginning of computer systems and networks, there has been a severe lack of analytical techniques enabling effective performance evaluation/prediction for actual systems and networks. Such techniques were needed, in particular, for the systems developed in rather poorly countries where the hardware available for the designers was obsolete in comparison to that available in well developed countries. The paper describes some experience in ICT system modeling and the network modeling tool and technique worked out.
The H∞ control of a class of the uncertain switched nonlinear cascaded systems with time delay is... more The H∞ control of a class of the uncertain switched nonlinear cascaded systems with time delay is explored in this paper via the multiple Lyapunov functions. The considered systems are assumed to comprise an inherently nonlinear and a linearizable nonlinear dynamic system that may be non-minimum phase. A group of partial differential inequalities containing adjustable functions are used in the control design task. The state feedback controllers and a suitable switching law are designed simultaneously so as to achieve the desired disturbance attenuation while preserving asymptotic stability for all admissible uncertainties. The partial differential inequalities are of lower dimension than general Hamilton–Jacobi inequalities, and therefore the solving process is feasible. This particular technique is applicable even if no subsystem is asymptotically stable. The non-minimum phase property is compensated for by means of an appropriate switching mechanism. A robust H∞ control for non-sw...
This paper discusses the stability analysis for a class of switched neutral systems with none of ... more This paper discusses the stability analysis for a class of switched neutral systems with none of the individual subsystems asymptotically stable. By employing a multiple generalized Lyapunov functional method and a free-weighting matrix technique, a delay-dependent stability criterion under a designed hysteresis switching law is developed in terms of linear matrix inequalities (LMIs). Finally, a simulation example is given to illustrate the effectiveness of the proposed method.
This paper presents a controller design method for dealing with the induced ℒ2-norm problem for s... more This paper presents a controller design method for dealing with the induced ℒ2-norm problem for switched linear parameter-varying (LPV) systems. Considering the arbitrary switchings caused by the parameters varying, a common parameter-dependent Lyapunov function is employed to derive sufficient linear matrix inequality (LMI) conditions for the switched LPV systems. A family of LPV controllers are designed according to the LMI conditions, and each of them is suitable for the corresponding parameter region. The proposed switching LPV control method is applied to an F-16 aircraft longitudinal model and simulation results demonstrate the effectiveness of the approach.
In this paper, a new global adaptive output feedback dynamic compensator is proposed for tracking... more In this paper, a new global adaptive output feedback dynamic compensator is proposed for tracking of a class of systems that are globally diffeomorphic into systems in generalized output feedback canonical form. Output-dependent nonlinearities are allowed to enter in both cases as additive and multiplicative. The system is allowed to contain unknown parameters multiplying output-dependent nonlinearities. The proposed method relies on a novel parameter estimator and state observer design methodology and the standard backstepping construction. It is shown in the paper the proposed design has three distinctive features not present in the known designs. The applicability and the effectiveness of our method are illustrated by means of respectively, a numerical example and two magnetic levitation systems which are, controlled by the coil current and the voltage applied to coil circuit
Graduate studies in fields of Engineering typically include advanced control theory. In turn, the... more Graduate studies in fields of Engineering typically include advanced control theory. In turn, these courses enhance both academic and applied research, hence contributing to combined knowledge and technology transfer, in particular if supported by industry as well. This paper reports on such fruitful experiences at our universities through the math-analytical back-stepping and state-feedback control design methodologies. Computer simulation and laboratory
The robust Hinfin control problem for the generator excitation system with the damping coefficien... more The robust Hinfin control problem for the generator excitation system with the damping coefficient uncertainty and external disturbances, is addressed. Storage functions of the control system are constructed based on modified adaptive backstepping sliding mode control method and Lyapunov method. A nonlinear robust Hinfin controller and a parameter updating law are obtained simultaneously. The controller can not only attenuate the
Proceedings of 14th International Power Electronics and Motion Control Conference EPE-PEMC 2010, 2010
Abstract A sliding mode controller employing the RBF neural network is designed for the anti-lock... more Abstract A sliding mode controller employing the RBF neural network is designed for the anti-lock braking system in automotive technology according to the requirement that the braking process must be fast and robust. The usual drawback of control chattering occurred in the classical sliding mode control can be alleviated with the proposed control scheme. Also the robustness of adaptive control system employing neural network is improved to some extent. Simulation investigation for scenario of vehicle activating brakes on dry road situation is ...
2010 IEEE International Conference on Systems, Man and Cybernetics, 2010
Abstract An active queue management (AQM) scheme employing state observer and sliding mode contro... more Abstract An active queue management (AQM) scheme employing state observer and sliding mode control (SMO-SMC) is designed in this paper in order to overcome congestion problem in TCP communication networks. First, sliding mode observer is designed for input delay network system; a sufficient condition is given for the existence of such an observer in terms of linear matrix inequality. Then, on the grounds of estimated system state vector, a controller is synthesized by using the sliding-mode control theory combined with the ...
2010 IEEE International Conference on Systems, Man and Cybernetics, 2010
Abstract This paper addresses the issues of passivity and feedback equivalence for switched nonli... more Abstract This paper addresses the issues of passivity and feedback equivalence for switched nonlinear systems via multiple storage functions. The concept of storage-like functions for switched systems is presented. A sufficient condition for passivity of the switched nonlinear systems is given via multiple storage functions under some switching signal. Then, the result is extended to find conditions under which the switched system is feedback equivalent to a passive switched system.
In this paper, an integral sliding mode control (ISMC)strategy is designed for rate-based ∞ow con... more In this paper, an integral sliding mode control (ISMC)strategy is designed for rate-based ∞ow control problem in asynchronous transfer mode (ATM) networks. A novelty of this paper is the use of a transformation, which eliminates the input delays, into the ISMC technology. The control scheme guarantees stability robustness to multiple time-delays in difierent channels and changeful available bit-rate (ABR) bandwidth.
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Papers by Georgi Dimirovski