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interval-time-delays
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Stability of neutral type fractional delay systems and its relation with stability of timedelay and discrete systems
, Article IET Control Theory and Applications ; Volume 10, Issue 18 , 2016 , Pages 2482-2489 ; 17518644 (ISSN) ; Haeri, M ; Sharif University of Technology
Institution of Engineering and Technology
2016
Abstract
The bounded-input bounded-output stability of fractional delay systems of neutral type is investigated in this study. The proposed method calculates the number of unstable poles of the system for each delay value. All time-delay intervals in time-delay space where system is stable are precisely determined. The stability of systems with not only indefinitely large values of time-delay, but also with multiple poles on the imaginary axis has been studied. The proposed method is employed for investigating the stability of a fractional delay system when its fractional orders approach to the integer numbers or zero. It is proved that simple case of neutral types and time-delay systems have the...
Comment on “Design of PID controllers for interval plants with time delay”
, Article Journal of Process Control ; Volume 44 , 2016 , Pages 160-161 ; 09591524 (ISSN) ; Nobakhti, A ; Sharif University of Technology
Elsevier Ltd
2016
Abstract
In [1] three theorems are presented which relate to the problem of stabilizing PID controller design for interval time-delay plants. We present a counterexample for these results
Synchronization of two coupled pacemaker cells based on the phase response curve
, Article Biomedical Signal Processing and Control ; Volume 4, Issue 1 , 2009 , Pages 57-66 ; 17468094 (ISSN) ; Azemi, A ; Khademi, M ; Karimi Ghartemani, M ; Sharif University of Technology
Abstract
In this paper, the synchronization of a pair of pacemaker cells as Sino-Atrial (SA) and Atrio-Ventricullar (AV) nodes have been studied and a new approach for synchronization, based on the concept of Phase Response Curve (PRC), has been proposed. The paper starts with presenting the necessary and sufficient conditions for synchronization in terms of the PRC parameters. Such conditions are time dependent and thus, the paper proceeds with deriving some sufficient conditions, which are not time dependent. The time-delay between the firing time of SA node and when it reaches the AV node is also considered. When the conditions for spontaneous synchronization are not valid, the synchronization is...
Controlling the depth of anesthesia by using extended DMC
, Article 2008 Cairo International Biomedical Engineering Conference, CIBEC 2008, Cairo, 18 December 2008 through 20 December 2008 ; 2008 ; 9781424426959 (ISBN) ; Towhidkhah, F ; Marami, B ; Sharif University of Technology
2008
Abstract
Monitoring and controlling the depth of anesthesia is really important, since over dosing and under dosing can be dangerous for the patients. Pharmacokinetic-Pharmacodynamic models vastly used for describing the relationship between input anesthetic agents and output patient endpoint variables. As there is a large variety between the patients so for controlling the depth of anesthesia we need a controller which should be robust enough and also because the anesthesia process is nonlinear and contains time delay, among them all the proposed methods for controlling the depth of anesthesia, model predictive controllers (MPCs) are good choices. Extended dynamic matrix control (EDMC) can be...