Kurum Yazarı "İftar, Altuğ" Scopus İndeksli Yayınlar Koleksiyonu İçin Listeleme
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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 ... -
A program for analysis and control of Petri nets
Apaydın Özkan, Hanife; Manay, A; Aybar, Aydın; İftar, Altuğ (IEEE, 2004)Analysis and control algorithms are introduced for discrete-event systems which are modeled by Petri nets. A simulation and control design program is then developed to implement these algorithms. The program can simulate ... -
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 ... -
Representation of the state of timed-place Petri nets using stretching
Aybar, Aydın; İftar, Altuğ (2009)Unlike untimed Petri nets, representation of the state of a timed Petri net and describing its evolution is not an easy task. Here, an approach, called place-stretching, is introduced to represent the state of a timed-place ... -
Robust control design for time-delay systems using non-causal uncertainty blocks
Ünal, Hakkı Ulaş; İftar, Altuğ (Institute of Electrical and Electronics Engineers Inc., 2014)Robust controller design problem for time-delay systems is considered. Both the time-delays, which may appear at the inputs and/or outputs of the plant, and the finite-dimensional part of the plant are assumed to be subject ... -
A Robust Controller Design Approach for Systems with Distributed Time-delay
İftar, Altuğ (IEEE, 2014)Robust controller design problem for time-delay systems with distributed time-delay is considered. A robustness bound, which accounts for the uncertainties in the system is defined. A controller design approach, which uses ... -
Robust controller design for flexible robot manipulators: an optimal output feedback controller design approach
İftar, Altuğ (IEEE, Piscataway, NJ, United States, 1994)A robust optimal output feedback controller design approach is proposed and applied to the controller design problem for one-link flexible robot manipulators. The flexible dynamics of a robot manipulator is represented by ... -
Robust Controller Design for Neutral Systems With Distributed Time-Delay
İftar, Altuğ (Elsevier Science BV, 2016)Robust stabilizing controller design for neutral time-delay systems with distributed time-delay is considered. The uncertainties in the system are bounded by using a frequency dependent function. This bound is then used ... -
Robust controller design for neutral time-delay systems
İftar, Altuğ (2015)A robustness measure that accounts for the uncertainties in a neutral time-delay system is defined. Using this measure, a robust controller design approach, which is based on a nominal model, is proposed. The proposed ... -
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 ... -
Robust rate-based flow controllers for high-speed networks: The case of uncertain time-varying multiple time-delays
Ataşlar, Banu; Quet, PF; İftar, Altuğ; Özbay Hitay; Kang, T; Kalyanaraman, S (IEEE, 2000)An H-infinity based robust controller is designed for a rate-feedback flow-control problem in single-bottleneck data-communication networks. The controller is robust to uncertain time-varying multiple time-delays in different ... -
Robust Servomechanism Problem for Descriptor-Type Systems with Distributed Time-Delay
İftar, Altuğ (IEEE, 2016)The dynamics of many systems may be described by differential equations coupled with algebraic equations. Such systems are usually termed as descriptor-type systems. Furthermore, the dynamics of many such systems may be ... -
Robust servomechanism problem for neutral distributed time-delay systems
İftar, Altuğ (2012)An important ptoblem in control engineering is to design a controller which stabilizes a given system and achieves robust tracking of a reference signal despite certain disturbance signals. The present paper considers this ... -
Robust Servomechanism Problem for Robotic Systems Described by Delay-Differential-Algebraic Equations
İftar, Altuğ (IEEE, 2015)Many robotic systems can be described by delay-differential-algebraic equations. An important problem in the control of robotic systems is to design a controller such that the overall system is asymptotically stable and ... -
Robust Static Output Feedback Controller Design for Systems with Uncertain Time-delays
Elmuhandes, S.; İftar, Altuğ (IEEE Computer Society, 2018)Robust stabilization of linear time-invariant retarded time-delay systems with multiple uncertain time-delays is considered. Besides stabilization, minimization of the spectral abscissa for the worst time-delays is also ... -
Robust tracking and disturbance rejection for decentralized neutral time-delay systems
İftar, Altuğ (IFAC Secretariat, 2011)The decentralized robust servomechanism problem, which is to design decentralized stabilizing controllers such that each decentralized output robustly tracks a given reference signal in the presence of certain disturbances, ... -
Robust tracking and disturbance rejection for decentralized time-delay systems
İftar, Altuğ (IFAC Secretariat, 2010)The decentralized robust servomechanism problem, which is to design decentralized stabilizing controllers such that each decentralized output robustly tracks a given reference signal in the presence of certain disturbances, ... -
Robust tracking and disturbance rejection for neutral time-delay systems
İftar, Altuğ (2010)The robust servomechanism problem, which is to design a stabilizing controller such that the system output robustly tracks a given reference signal in the presence of certain disturbances, is considered for linear ...