Yazar "Ünal, Hakkı Ulaş" için Bildiri Koleksiyonu listeleme
-
Algorithms and software for approximating and evaluating fir filters
Michiels, Wim; Ünal, Hakkı Ulaş (Institute of Electrical and Electronics Engineers Inc., 2014)The controllers designed for time-delays systems often involve finite impulse response (FIR) filters, in particular prediction based controllers for systems with input/output delays. We present algorithms and software to ... -
Comparing PI controllers for delay models of TCP/AQM networks
Ünal, Hakkı Ulaş; Melchor-Aguilar, D.; Üstebay, D.; Niculescu, S. -I.; Özbay Hitay (IFAC Secretariat, 2010)In this paper, ns-2 simulations and related comparisons of four different PI controllers designed for TCP/AQM networks will be presented. The simulations are performed for various scenarios -
Further Remarks on Delay Dynamics in Oregonator Models
Ünal, Hakkı Ulaş; Boussaada, İslam; Niculescu, Silviu-Iulian (IEEE, 2016)Motivated by the fact that molecules reacting through some biological channels may need some time-lag due transcription and translation processes, this note is devoted to the study of stability properties of a delayed ... -
Further remarks on the effect of multiple spectral values on the dynamics of time-delay systems. Application to the control of a mechanical system
Boussaada, İslam; Tliba, Sami; Niculescu, Silviu-Iulian; Ünal, Hakkı Ulaş; Vyhlidal, Tomas (Elsevier Science Inc, 2018)A question of ongoing interest for linear Time-delay systems is to determine conditions on the equation parameters that guarantee the exponential stability of solutions. In recent works a new interesting property of ... -
Prediction of partially synchronous regimes of delay-coupled nonlinear oscillators?
Ünal, Hakkı Ulaş; Michiels, W. (2013)We present an approach which allows to accurately predict both the occurrence and type of partially synchronous regimes of delay-coupled non-linear oscillators. Unlike the conventional approach, we build on an analysis of ... -
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 ... -
Stable H? flow controller design
Ünal, Hakkı Ulaş; İftar, Altuğ (2009)Stable H? controller design, for a flow control problem which involves multiple time-delays, is considered. An algorithm, which produces a stable controller apart from the integral action, is developed utilizing a rational ... -
Strong stabilization of time-delay systems
Ünal, Hakkı Ulaş; İftar, Altuğ (IFAC Secretariat, 2012)Stable controllers are required due to modelling imperfections and for better performance achievements. As is well known, a stable stabilizing controller for a given real-rational plant exists if and only if the plant ... -
Tracking sustained oscillations in delay model oregonators
Ünal, Hakkı Ulaş; Boussaada, İslam; Niculescu, Silviu-Iulian (Institute of Electrical and Electronics Engineers Inc., 2016)Sustained oscillations occur in many biological organisms and some chemical reactions. Belousov-Zhabotinskii (BZ) reaction is one these chemical oscillators, however, since its oscillatory behaviour is analogous to ones ... -
Utilization of non-causal uncertainty blocks in the robust flow controller design problem for data-communication networks
Ünal, Hakkı Ulaş; İftar, Altuğ (IEEE, 2008)Robust How controller design problem for data-communication networks with multiple uncertain time-delays is considered. A recent result on the validity of the small gain theorem for systems with non-causal subsystems is ...