Kurum Yazarı "İftar, Altuğ" Makale Koleksiyonu İçin Listeleme
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Centralized and decentralized supervisory controller design to enforce boundedness, liveness, and reversibility in Petri nets
Aybar, Aydın; İftar, Altuğ; Apaydın-Özkan, H (Taylor & Francis LTD, 2005)Supervisory controller design to enforce boundedness, liveness, and reversibility in Petri nets is considered. The Petri nets considered may have non-unity weight arcs and both controllable and uncontrollable transitions. ... -
Deadlock Avoidance Controller Design for Timed Petri Nets Using Stretching
Aybar, Aydın; İftar, Altuğ (IEEE-Inst Electrical Electronics Engineers Inc, 2008)The recently introduced method, which was called "stretching," is extended to timed Petri nets which may have both controllable and uncontrollable transitions. Using this method, a new Petri net, called "stretched Petri ... -
Decentralised robust flow controller design for networks with multiple bottlenecks
Munyas, İnci; Yelbasi, özen; Biberovic, Enis; İftar, Altuğ; Özbay Hitay (Taylor & Francis LTD, 2009)Decentralised rate-based flow controller design in multi-bottleneck data-communication networks is considered. An H problem is formulated to find decentralised controllers which can be implemented locally at the bottleneck ... -
Decentralized control strategies for dynamic routing
İftar, Altuğ; Davison, EJ (Wiley-Blackwell, 2002)The routing problem in multi-destination data Communication networks is considered. A dynamic model, Which can incorporate arbitrary. different, time-varying processing delays at different nodes, is developed to describe ... -
A decentralized discrete-time controller for dynamic routing
İftar, Altuğ; Davison, EJ (Taylor & Francis LTD, 1998)A decentralized controller for dynamic routing in multi-destination large-scale data communication networks is presented. A dynamic model, which can incorporate possibly time-varying different processing delays at different ... -
Decentralized robust control of large flexible space structures
İftar, Altuğ (1996)This article presents various is sues related to the control of large flexible space structures. -
Decentralized routing controller design using overlapping decompositions
Ataşlar, Banu; İftar, Altuğ (Taylor & Francis LTD, 1999)The use of overlapping decompositions in designing routing controllers for large-scale networks is considered and a decentralized dynamic routing controller design strategy is proposed. The strategy is based on the overlapping ... -
Decentralized Structural Controller Design for Large-Scale Discrete-Event Systems Modelled By Petri Nets
Aybar, Aydın; İftar, Altuğ (Kybernetika, 2009)A decentralized structural controller design approach for discrete-event systems modelled by Petri nets is presented. The approach makes use of overlapping decompositions. The given Petri net model is first overlappingly ... -
Decentralized supervisory controller design for discrete-event systems using overlapping decompositions and expansions
Aybar, Aydın; İftar, Altuğ (Watam Press, 2004)A decentralized supervisory controller design approach for discrete-event systems (DESs) modeled by automata or formal languages is presented. The controller is designed in order to lead the DES to certain desired marked ... -
Decentralized supervisory controller design to avoid deadlock in Petri nets
Aybar, Aydın; İftar, Altuğ (Taylor & Francis LTD, 2003)A decentralized supervisory controller design approach, using overlapping decompositions, is proposed for discrete-event systems modelled by Petri nets to avoid deadlock. In this approach, the given original Petri net is ... -
Extension Principle and Controller Design for Systems With Distributed Time-Delay
İftar, Altuğ (Kybernetika, 2017)Extension principle is defined for systems with distributed time-delay and the necessary and sufficient conditions for one system being an extension of the other are presented. Preservation of stability properties between ... -
A linear programming based decentralized routing controller for congested highways
İftar, Altuğ (Pergamon-Elsevier Science LTD, 1999)A decentralized controller for dynamic routing in multidestination trasportation networks is presented. The proposed algorithm is especially suited for congested networks, where the traffic demand is close to or more than ... -
Overlapping decompositions and expansions of Petri nets
Aybar, Aydın; İftar, Altuğ (IEEE-Inst Electrical Electronics Engineers Inc, 2002)Overlapping decompositions and expansions are considered to design decentralized controllers for discrete-event systems (DESs) modeled, by Petri nets. The inclusion principle for Petri nets is first defined. It is shown ... -
Overlapping decompositions, expansions, contractions, and stability of hybrid systems
İftar, Altuğ; Özgüner, U (IEEE-Inst Electrical Electronics Engineers Inc, 1998)Inclusion and extension principles are defined and studied for hybrid systems, The controller design problem for hybrid systems is then considered within the framemork of the extension principle. It is shown that if the ... -
Performance and Robustness of Flow Controllers Designed Using Non-causal Uncertainty Blocks
Ünal, Hakkı Ulaş; İftar, Altuğ (Wiley, 2013)According to some recent results, use of non-causal uncertainty blocks may be advantageous in the robust controller design of systems with multiple uncertain time-delays. In this work, performance and robustness improvements ... -
Performance level and stability margins of an optimal H-infinity flow controller
Ünal, Hakkı Ulaş; İftar, Altuğ (SAGE Publications LTD, 2012)Flow controllers are needed to avoid congestion in different types of networks. The dynamics of such networks, however, can usually be represented by infinite-dimensional models, which are either based on partial-differential ... -
Rate-based flow controllers for communication networks in the presence of uncertain time-varying multiple time-delays
Quet, PF; Ataşlar, B; İftar, Altuğ; Özbay Hitay; Kalyanaraman, S; Kang, T (Pergamon-Elsevier Science LTD, 2002)An H-infinity based robust controller is designed for a rate-feedback flow-control problem in single-bottleneck communication networks. The controller guarantees stability robustness to uncertain time-varying multiple ... -
Robust flow control in data-communication networks with multiple time-delays
Ünal, Hakkı Ulaş; Ataşlar-AyyIldız, Banu; İftar, Altuğ; Özbay Hitay (Wiley, 2010)Robust controller design for a flow control problem where uncertain multiple time-varying time-delays exist is considered. Although primarily data-communication networks are considered, the presented approach can also be ... -
Robust Optimal Control of Power Systems
İftar, Altuğ (Acta Press, 2016)The disturbance attenuation and robustness problems for power systems, modelled as nonlinear dynamic systems, is considered. A simultaneous solution to these two problems is proposed by using the necessary conditions. An ... -
A small gain theorem for systems with non-causal subsystems
Ünal, Hakkı Ulaş; İftar, Altuğ (Pergamon-Elsevier Science LTD, 2008)Small gain theorems are used to verify the stability of a feedback interconnection of causal stable systems. In this work, we extend the small gain condition to test the stability of a feedback interconnection of two stable ...