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作者： Vafaei, Alaleh Yazdanpanah, Mohammad Javad Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran PO Box 14395/515 Tehran Iran

This paper proposes a new state observer for nonlinear systems with non negligible and different time delays in the state, output and input and Lipschitz nonlinearity. The proposed observer is composed of a chain of observers with similar algorithm. Each of them estimates the states in different time instants, while the last observer estimates the state in the present time. Conditions for stability of the observer are translated into linear matrix inequalities (LMIs) which facilitates the design of observer gains. Simulation results demonstrate effectiveness of this observer. © 2015 Elsevier Ltd. All rights reserved.

关键词： Nonlinear systems

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Risk assessment of coronary arteries heart disease based on neuro-fuzzy classifiers

Risk assessment of coronary arteries heart disease based on ...

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17th Iranian Conference in Biomedical Engineering, ICBME 2010

作者： Zand, Mohammad Danesh Ansari, Amir Hossein Lucas, Caro Zoroofi, Reza Aghaee Zade Department of Electrical and Computer Engineering University of Tehran Tehran Iran Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran

ISBN: (纸本)9781424474844

Coronary artery heart disease is one of the main reasons of death in under development countries such as Iran. Based on vagueness in data and uncertainty in decision making finding an optimal way for diagnosis would be helpful. The main goal of this article is to change the linguistic terms which doctors use for representing coronary heart disease possibility into classified stages. Indeed the medical diagnosis can be used as an issue of pattern recognition by an input vector of features introduced to a system so the corresponding risk of a particular disease can be estimated with this system. in this paper we used an adaptive network-based inference system in order to assess the risk of coronary artery heart diseases. With this point of view that fault in medical diagnosis are more errors of omission than of commission, we are going to reduce this diagnosis defect with Neuro-fuzzy networks such as Multi-Layer Perceptron (MLP) and an inference Neuro-fuzzy network such as ANFIS. In the last section we will compare these methods to show that ANFIS can obtain the best accommodation with doctor's opinions. © 2010 IEEE.

关键词： Diagnosis

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DESYNCHRONIZATION OF TWO COUPLED LIMIT-CYCLE OSCILLATORS USING AN ASTROCYTE-INSPIRED controlLER

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International Journal of Biomathematics 2014年第1期7卷 1-23页

作者： GHAZAL MONTASERI MOHAMMAD JAVAD YAZDANPANAH Advanced Control Systems Laboratory School of Electrical and Computer EngineeringCollege of Engineering University of Tehran Tehran Iran Advanced Control Systems LaboratoryControl and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran

Astrocytes have potential to break synchrony between neurons. Authors＇ recent researches reveal that astrocytes vary the synchronization threshold and provide an appropriate feedback control in stabilizing neural activities. In this study, we propose an astrocyte-inspired controller for desynchronization of two coupled limit-cycle oscillators as a minimal network model. The design procedure consists of two parts. First, based on the astrocyte model, the structure of the dynamic controller is suggested. Then, to have an emcient controller, parameters of controller are tuned through an optimization algo- rithm. The proposed bio-inspired controller takes advantages of three important proper- ties：（1） the controller desynchronizes the oscillators without any undesirable effects （e.g. stopping, annihilating or starting divergent oscillations）; （2） it consumes little effort to preserve the desirable desynchronized state; and （3） the controller is robust with respect to parameters＇ variations. Simulation results reveal the ability of the proposed controller.

关键词： Astrocyte dynamic model bio-inspired controller coupled limit-cycle oscillators desynchronization optimization

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A note on fuzzy variance analysis model

A note on fuzzy variance analysis model

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International Symposium on Signals, Circuits and Systems, SCS 2003

作者： Kharaajoo, Mahdi Jalili Ebrahimirad, Hassan Control and Intelligent Processing Center of Excellence ECE Department University of Tehran P.O. Box 14395/515 Tehran Iran

ISBN: (纸本)0780379799

In this paper, a fuzzy variance analysis model with interaction between explanatory variables using Tanaka's model is investigated. A linear programming model is formulated for measuring the value of response factors, based on Tanaka's model. The proposed model measures both values of response factors, as well as their interactions. © 2003 IEEE.

关键词： Linear programming

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ROBUST EIGENSTRUCTURE ASSIGNMENT: NEW APPROACH

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IFAC Proceedings Volumes 2005年第1期38卷 136-141页

作者： Alireza Esna Ashari Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran

This paper considers the problem of robust eigenstructure assignment, which involves finding a feedback gain matrix that makes the closed-loop system insensitive to perturbations or parameter variations. The main contribution of the paper is to derive a new robustness measure using the matrix perturbation theory. The new measure is used to formulate a new method for robust control of the system via state or output feedback. The freedom provided by eigenvalue assignment of multivariable systems is applied to optimize the new index using genetic algorithms. The new results expressed in this paper confirm the previously derived results on robust eigenstructure assignment. In the case of state feedback design, the new robustness index verifies a previously proposed robustness measure. A numerical example is presented to illustrate the effectiveness of the proposed method.

关键词： Eigenstructure assignment Robust stability Genetic algorithms Multivariable control systems Eigenvalues Sensitivity

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A MATHEMATICAL APPROACH TO DESYNCHRONIZATION OF COUPLED OSCILLATORS： APPLICATION TO A NEURONAL ENSEMBLE

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International Journal of Biomathematics 2013年第2期6卷 173-189页

作者： GHAZAL MONTASERI ARAS ADHAMI-MIRHOSSEINI MOHAMMAD JAVAD YAZDANPANAH Advanced Control Systems Laboratory School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran Advanced Control Systems LaboratoryControl and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran

Synchronization of neurons plays an important role in vision, movement and memory. However, many neurological disorders such as epilepsies, Parkinson disease and essen- tial tremor are related to excessive synchronization of neurons. In the line of therapy, stimulations to these pathologically synchronized neurons should be capable of breaking synchrony. As the first step of designing an effective stimulation, we consider desynchro- nization problem of coupled limit-cycle oscillators ensemble. First, the desynchronization problem is redefined in a nonlinear output regulation framework. Then, we design an output regulator （stimulation） which forces limit-cycle oscillators to track exogenous sinusoidal references with different phases. The proposed stimulation is robust against variations of oscillators＇ frequencies. Mathematical analysis and simulation results reveal the efficiency of the proposed technique.

关键词： Limit-cycle oscillators nonlinear output regulation synchrony suppression robust stimulation.

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Second-Order Sliding Mode Design Based on the Integration of Proportional-Integral and Nonlinear controllers for Load Frequency control 31

Second-Order Sliding Mode Design Based on the Integration of...

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31st International Conference on Electrical Engineering, ICEE 2023

作者： Samari, Behrad Yazdanpanah, Mohammad Javad University of Tehran Department of Electrical Engineering Tehran Iran School of Ece University of Tehran Control & Intelligent Processing Center of Excellence Tehran Iran

ISBN: (纸本)9798350312560

This article addresses the load frequency control (LFC) problem of control-area-partitioned power networks. An equivalent generator with second-order turbine-governor dynamics is utilized to model each control area, and power flows establish nonlinear couplings between control areas. As a consequence of the integration of the proportional-integral (PI) controller and the nonlinear controller, a novel suitable sliding manifold for enhancing dynamic performance is first proposed. Then, a decentralized second-order sliding mode (SOSM) controller is designed for LFC in power networks, which regulates the frequency and sustains the net inter-area power flows at the predetermined values. The simulation results demonstrate the efficacy of the proposed control strategy. © 2023 IEEE.

关键词： Decentralized control

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Application of predictive control algorithm to congestion control in differentiated service networks 11

Application of predictive control algorithm to congestion co...

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11th International Conference on Telecommunications, ICT 2004

作者： Jalili-Kharaajoo, Mahdi Araabi, Babak N. Young Researchers Club Islamic Azad University Tehran Iran Control and Intelligent processing Center of Excellence ECE Department University of Tehran Iran

ISBN: (纸本)3540225714

The Differentiated Service (Diff-Serv) architectures are proposed to deliver Quality of Service (QoS) in TCP/IP networks. The aim of this paper is to design an active queue management system to secure high utilization, bounded delay and loss, while the network complies with the demands each traffic class sets. To this end, predictive control strategy is used to design the congestion controller. This control strategy is suitable for plants with time delay, so the effects of round trip time delay can be reduced suing predictive control algorithm in comparison with the other exciting control algorithms. Simulation results of the proposed control action for the system with and without round trip time delay, demonstrate the effectiveness of the controller in providing queue management system. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Quality of service

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Robust decentralized pole assignment

Robust decentralized pole assignment

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作者： Ashari, Alireza Esna Labibi, Batool Control and Intelligent Processing Center of Excellence University of Tehran Tehran Iran K. N. Toosi University of Technology Tehran Iran

ISBN: (纸本)008045108X

This paper considers the problem of assigning the closed-loop eigenvalues of linear large-scale systems in a desired stable region using decentralized control. A new method for robust decentralized control of the system via eigenstructure assignment of the subsystems is given. Based on the matrix perturbation theory, sufficient conditions for eigenstructure of each isolated subsystem are derived, when these conditions are satisfied, the closed-loop poles of the overall system will be assigned in the desirable region. Also, a new robustness measure is proposed, which does not need to calculate the eigenvectors and condition numbers. So the proposed measure has less computational burden than many of similar robustness measures. Based on the presented results, a new algorithm for decentralized robust pole assignment is suggested to design output feedback or state feedback. Copyright © 2005 IFAC.

关键词： Eigenvalues and eigenfunctions

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Appropriate twinkling frequency and inter-sources distance selection in SSVEP-based HCI systems

Appropriate twinkling frequency and inter-sources distance s...

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2011 2nd IEEE International Conference on Signal and Image processing Applications, ICSIPA 2011

作者： Resalat, Seyed Navid Setarehdan, Seyed Kamaledin Afdideh, Fardin Heidarnejad, Ali Control and Intelligent Processing Center of Excellence College of Engineering University of Tehran Tehran Iran College of Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9781457702419

Steady-State Visual Evoked Potentials (SSVEPs) are one of the most important EEG signals used in Human Computer Interface (HCI) systems. These signals are generated by Looking at flickering external light sources stimulating the central part of the retina. By increasing the number of external light sources, detection of the corresponding SSVEPs from the recorded EEG signal becomes more complicated. On the other hand, the ratio of the sensitivity to specificity in high-speed classifiers becomes more significant. This study presents the effect of the twinkling frequencies and the inter-sources distance of two Light Emitting Diodes (LEDs) on the ratio of the sensitivity to specificity of the two classes. The features used for signal classification is the amplitude of the main frequencies in the spectrum of each frequency pairs that is simply classified by the Max classifier. The purpose of this is to find the best twinkling frequencies and the best inter-sources distance among a set of predefined values when there are only two light sources in order to nearly equalize the sensitivity and the specificity. For this aim, seven different frequency pairs of LEDs in five distinct inter-sources distances are examined and it is shown that the best frequency pair is 10 and 15 Hz with inter-sources distances of 24 or 44 cm. © 2011 IEEE.

关键词： Light emitting diodes

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