IASSON KARAFYLLIS

 

 

 

Iassonas Karafyllis

Iasson Karafyllis received the B.S. degree in chemical engineering from the National Technical University of Athens (NTUA), Athens, Greece, in 1994, the M.Sc. degree in mathematics from the University of Minnesota, Minneapolis, in 1997, and the Ph.D. degree in mathematics from the NTUA, in 2003.

 

He is currently an Assistant Professor in the Department of Mathematics at the NTUA. His research interests include mathematical systems and control theory, stability theory, and robust feedback stabilization problems for deterministic systems. He is a coauthor of the book Stability and Stabilization of Nonlinear Systems (Springer, 2011; see here ).

 

For a detailed CV click here . CV in Greek here.

 

Profile at Google scholar: here .

 

Email address: iasonkar@central.ntua.gr

 

 

 

 

Research Interests

 

1) Stability Theory of Dynamical Systems with emphasis on Lyapunov stability theory for uncertain nonlinear deterministic systems described by:

 

a.       finite or infinite dimensional difference equations [12,14,37,46,59],

b.      ordinary differential equations [5,6,7,8,9,19,20,21,22,39,45,46,S3],

c.       retarded functional differential and integral equations [8,13,19,20,21,26,27, 32,35, 39,46,48,56,BC1,S1,S5],

d.      first-order hyperbolic partial differential equations [32,56,S1],

e.       1-D parabolic partial differential equations [63,S6],

f.       coupled retarded functional differential equations and functional difference equations [19,20,21,23,39,46],

g.      impulsive differential equations (hybrid systems, systems under sampled-data control) [16,19,20,21,31,39,46,S4].

 

2) Mathematical Systems and Control Theory with emphasis on the solution of robust feedback stabilization problems [1,2,3,4,5,10,11,15,16,17,22,25,29,30,33,35,36, 40,42,44,49,51,52,53,55,56,57,60,61,62,BC2,BC3,S1,S2], tracking control problems [1,4,6,58] and observer design/existence problems [11,18,24,34,41,43,47,50,S4] for nonlinear uncertain deterministic control systems of the above classes.

 

3) Applications of major results of Mathematical Control Theory to Game Theory [37], Fixed Point Theory [37], Nonlinear Programming [54,S3], Mathematical Biology [22,30,33,46,47,S1], Mathematical Economics [28,37] and Numerical Analysis [38].

 

4) Applications of major results of Numerical Analysis to Mathematical Systems and Control Theory [12,25,40,57,58,61].

 

5) Mathematical modeling of traffic systems [59,60,62,S2] and modeling of physical, chemical, biological and economic phenomena based on scientific principles and logical requirements (non-empirical models) [22,28,33,37,S1]. 

 

6) Applications of major results of Non-Smooth Analysis and Set-Valued Analysis to Mathematical Systems and Control Theory [3,17].

 

 

 

Books:  

 

B1. I. Karafyllis and Z.-P. Jiang, Stability and Stabilization of Nonlinear Systems, Springer-Verlag London (Series: Communications and Control Engineering), 2011.

      B2. I. Karafyllis and M. Krstic, Predictor Feedback for Delay Systems : Implementations and Approximations, to be published by Birkhäuser.

 

 

Edited Books:

 

B3. Recent Results on Nonlinear Time Delayed Systems, Eds. M. Malisoff, P. Pepe, F. Mazenc and I. Karafyllis, Advances in Delays and Dynamics (ADD@S), Springer, 2015.

 

Book Chapters:

BC1. I. Karafyllis and P. Pepe, “A Note on Converse Lyapunov Results for Neutral Systems”, Recent Results on Nonlinear Time Delayed Systems (Eds. M. Malisoff, F. Mazenc, P. Pepe and I. Karafyllis) in the series Advances in Delays and Dynamics (ADD@S), Springer, 2015.
BC2. T. Ahmed-Ali, I. Karafyllis, M. Krstic and F. Lamnabhi-Lagarrigue, “Robust Stabilization of Nonlinear Globally Lipschitz Delay Systems”, Recent Results on Nonlinear Time Delayed Systems (Eds. M. Malisoff, F. Mazenc, P. Pepe and I. Karafyllis) in the series Advances in Delays and Dynamics (ADD@S), Springer, 2015.

BC3. I. Karafyllis, M. Malisoff, F. Mazenc, and P. Pepe, “Stabilization of Nonlinear Delay Systems: A Tutorial on Recent Results”, Recent Results on Nonlinear Time Delayed Systems (Eds. M. Malisoff, P. Pepe, F. Mazenc and I. Karafyllis), Advances in Delays and Dynamics (ADD@S), Springer, 2015.

 

 

 

 

Journal Publications:

 

  1. J. Tsinias and I. Karafyllis, “ISS Property for Time-Varying Systems and Application to Partial-State Feedback Stabilization and Asymptotic Tracking”, IEEE Transactions Automatic Control, 44(11), 1999, pp. 2179-2185. PDF
  2. I. Karafyllis, “Non-Uniform Stabilization of Control Systems”, IMA Journal of Mathematical Control and Information, 19(4), 2002, pp. 419-444. PDF
  3. I. Karafyllis, “Necessary and Sufficient Conditions for the Existence of Stabilizing Feedback for Control Systems”, IMA Journal of Mathematical Control and Information, 20(1), 2003, pp. 37-64. PDF
  4. I. Karafyllis and J. Tsinias, “Global Stabilization and Asymptotic Tracking for a Class of Nonlinear Systems by Means of Time-Varying Feedback”, International Journal of Robust and Nonlinear Control, 13(6), 2003, pp. 559-588. PDF
  5. I. Karafyllis and J. Tsinias, “A Converse Lyapunov Theorem for Non-Uniform in Time Global Asymptotic Stability and Stabilization by Means of Time-Varying Feedback”, SIAM Journal Control and Optimization, 42(3), 2003, pp. 936-965. PDF
  6. I. Karafyllis and J. Tsinias, “Non-Uniform in Time Stabilization for Linear Systems and Tracking Control for Nonholonomic Systems in Chained Form”, International Journal of Control, 76(15), 2003, pp. 1536-1546. PDF
  7. I. Karafyllis and J. Tsinias, “Non-Uniform in Time Input-to-State Stability and the Small-Gain Theorem”, IEEE Transactions Automatic Control, 49(2), 2004, pp. 196-216. PDF
  8. I. Karafyllis, “The Non-Uniform in Time Small-Gain Theorem for a Wide Class of Control Systems with Outputs”, European Journal of Control, 10(4), 2004, pp. 307-323. PDF
  9. I. Karafyllis, “Non-Uniform in Time Robust Global Asymptotic Output Stability”, Systems and Control Letters, 54(3), 2005, pp. 181-193. PDF
  10. I. Karafyllis, “Applications of Non-Uniform in Time Robust Global Asymptotic Output Stability to Robust Partial State Feedback Stabilization”, Systems and Control Letters, 54(10), 2005, pp. 939-951. PDF
  11. I. Karafyllis and C. Kravaris, “Robust Output Feedback Stabilization and Nonlinear Observer Design”, Systems and Control Letters, 54(10), 2005, pp. 925-938. PDF
  12. I. Karafyllis, “Non-Uniform Robust Global Asymptotic Stability for Discrete-Time Systems and Applications to Numerical Analysis”, IMA Journal of Mathematical Control and Information, 23(1), 2006, pp. 11-41. PDF
  13. I. Karafyllis, “Lyapunov Theorems for Systems Described by Retarded Functional Differential Equations”, Nonlinear Analysis: Theory, Methods and Applications, 64(3), 2006, pp. 590-617. PDF
  14. I. Karafyllis, “Non-Uniform in Time Robust Global Asymptotic Output Stability for Discrete-Time Systems”, International Journal of Robust and Nonlinear Control, 16(4), 2006, pp. 191-214. PDF
  15. I. Karafyllis, “Finite-Time Global Stabilization by Means of Time-Varying Distributed Delay Feedback”, SIAM Journal Control and Optimization, 45(1), 2006, pp. 320-342. PDF
  16. I. Karafyllis, “Stabilization by Means of Time-Varying Hybrid Feedback”, Mathematics of Control, Signals and Systems, 18(3), 2006, pp. 236-259. PDF
  17. I. Karafyllis and S. Kotsios, “Necessary and Sufficient Conditions for Robust Global Asymptotic Stabilization of Discrete-Time Systems”, Journal of Difference Equations and Applications, 12(7), 2006, pp. 741-768. PDF
  18. I. Karafyllis and C. Kravaris, “On the Observer Problem for Discrete-Time Control Systems”, IEEE Transactions on Automatic Control, 52(1), 2007, pp. 12-25. PDF
  19. I. Karafyllis, “A System-Theoretic Framework for a Wide Class of Systems I: Applications to Numerical Analysis”, Journal of Mathematical Analysis and Applications, 328(2), 2007, pp. 876-899. PDF
  20. I. Karafyllis, “A System-Theoretic Framework for a Wide Class of Systems II: Input-to-Output Stability”, Journal of Mathematical Analysis and Applications, 328(1), 2007, pp. 466-486. PDF
  21. I. Karafyllis and Z.-P. Jiang, “A Small-Gain Theorem for a Wide Class of Feedback Systems with Control Applications”, SIAM Journal Control and Optimization, 46(4), 2007, pp. 1483-1517. PDF
  22. I. Karafyllis, C. Kravaris, L. Syrou and G. Lyberatos, “A Vector Lyapunov Function Characterization of Input-to-State Stability with Application to Robust Global Stabilization of the Chemostat”, European Journal of Control, 14(1), 2008, pp. 47-61. PDF
  23. P. Pepe, I. Karafyllis and Z.-P. Jiang, “On the Liapunov-Krasovskii Methodology for the ISS of Systems described by Coupled Delay Differential and Difference Equations”, Automatica, 44(9), 2008, pp. 2266-2273. PDF
  24. I. Karafyllis and C. Kravaris, “Non-Uniform in Time State Estimation of Dynamical Systems”, Systems and Control Letters, 57(9), 2008, pp. 714-725. PDF
  25. I. Karafyllis, “Global Stabilization by Means of Discrete-Delay Static Output Feedback”, Systems and Control Letters, 57(12), 2008, pp. 987-995. PDF
  26. I. Karafyllis, P. Pepe and Z.-P. Jiang, “Global Output Stability for Systems Described by Retarded Functional Differential Equations: Lyapunov Characterizations”, European Journal of Control, 14(6), 2008, pp.516-536. PDF
  27. I. Karafyllis, P. Pepe and Z.-P. Jiang, “Input-to-Output Stability for Systems Described by Retarded Functional Differential Equations”, European Journal of Control, 14(6), 2008, pp. 539-555. PDF
  28. G. Athanasiou, I. Karafyllis and S. Kotsios, “Price Stabilization Using Buffer Stocks”, Journal of Economic Dynamics and Control, 32(4), 2008, pp. 1212-1235. PDF
  29. I. Karafyllis and J. Tsinias, “Control Lyapunov Functions and Stabilization by Means of Continuous Time-Varying Feedback”, ESAIM Control, Optimisation and Calculus of Variations, 15(3), 2009, pp. 599-625. PDF
  30. I. Karafyllis and C. Kravaris, “Robust Global Stabilizability by Means of Sampled-Data Control with Positive Sampling Rate”, International Journal of Control, 82(4), 2009, pp. 755-772. PDF
  31. I. Karafyllis and C. Kravaris, “Global Stability Results for Systems under Sampled-Data Control”, International Journal of Robust and Nonlinear Control, 19(10), 2009, pp. 1105-1128. PDF
  32. I. Karafyllis, P. Pepe and Z.-P. Jiang, “Stability Results for Systems Described by Coupled Retarded Functional Differential Equations and Functional Difference Equations”, Nonlinear Analysis, Theory, Methods and Applications, 71(7-8), 2009, pp. 3339-3362. PDF
  33. I. Karafyllis, C. Kravaris and N. Kalogerakis, “Relaxed Lyapunov Criteria for Robust Global Stabilization of Nonlinear Systems”, International Journal of Control, 82(11), 2009, pp. 2077-2094. PDF
  34. I. Karafyllis and C. Kravaris, “From Continuous-Time Design to Sampled-Data Design of Observers”, IEEE Transactions on Automatic Control, 54(9), 2009, pp. 2169-2174. PDF
  35. I. Karafyllis and Z.-P. Jiang, “Stability and Control of Nonlinear Systems Described by Retarded Functional Equations: A Review of Recent Results”, Science in China Series F: Information Sciences, 52(11), 2009, pp. 2104-2126. PDF
  36. I. Karafyllis and Z.-P. Jiang, “Necessary and Sufficient Lyapunov-like Conditions for Robust Nonlinear Stabilization”, ESAIM Control, Optimisation and Calculus of Variations, 16(4), 2010, pp. 887-928. PDF
  37. I. Karafyllis, Z.-P. Jiang and G. Athanasiou, “Nash Equilibrium and Robust Stability in Dynamic Games: A Small-Gain Perspective”, Computers and Mathematics with Applications, 60(11), 2010, pp. 2936-2952. PDF
  38. I. Karafyllis and L. Grüne, “Feedback Stabilization Methods for the Numerical Solution of Systems of Ordinary Differential Equations”, Discrete and Continuous Dynamical Systems: Series B, 16(1), 2011, pp. 283-317. PDF
  39. I. Karafyllis and Z.-P. Jiang, “A Vector Small-Gain Theorem for General Nonlinear Control Systems”, IMA Journal of Mathematical Control and Information, 28(3), 2011, pp. 309-344. PDF
  40. I. Karafyllis, “Stabilization By Means of Approximate Predictors for Systems with Delayed Input”, SIAM Journal on Control and Optimization, 49(3), 2011, pp. 1100-1123. PDF
  41. I. Karafyllis and Z.-P. Jiang, “Hybrid Dead-Beat Observers for a Class of Nonlinear Systems”, Systems and Control Letters, 60(8), 2011, pp. 608-617. PDF
  42. I. Karafyllis and M. Krstic, “Nonlinear Stabilization under Sampled and Delayed Measurements, and with Inputs Subject to Delay and Zero-Order Hold”, IEEE Transactions on Automatic Control, 57(5), 2012, pp. 1141-1154. PDF
  43. I. Karafyllis and C. Kravaris, “Global Exponential Observers for Two Classes of Nonlinear Systems”, Systems and Control Letters, 61(7), 2012, pp. 797-806. PDF
  44. I. Karafyllis and M. Krstic, “Global Stabilization of Feedforward Systems Under Perturbations in Sampling Schedule”, SIAM Journal on Control and Optimization, 50(3), 2012, pp. 1389–1412. PDF
  45. I. Karafyllis, “Can We Prove Stability by Using A Positive Definite Function with Non Sign-Definite Derivative?”, IMA Journal of Mathematical Control and Information, 29(2), 2012, pp. 147-170. PDF
  46. I. Karafyllis and Z.-P. Jiang, “A New Small-Gain Theorem with an Application to the Stabilization of the Chemostat”, International Journal of Robust and Nonlinear Control, 22(14), 2012, pp. 1602–1630. PDF
  47. I. Karafyllis and Z.-P. Jiang, “Reduced Order Dead-Beat Observers for the Chemostat”, Nonlinear Analysis Real World Applications, 14(1), 2013, pp. 340–351. PDF

48.  P. Pepe and I. Karafyllis, “Converse Lyapunov-Krasovskii Theorems for Systems Described by Neutral Functional Differential Equations in Hale’s Form”, International Journal of Control, 86(2), 2013, pp. 232-243. PDF

  1. I. Karafyllis and M. Krstic, “Delay-Robustness of Linear Predictor Feedback Without Restriction on Delay Rate”, Automatica, 49(6), 2013, pp. 1761-1767. PDF
  2. T. Ahmed-Ali, I. Karafyllis and F. Lamnabhi-Lagarrigue, “Global Exponential Sampled-Data Observers for Nonlinear Systems with Delayed Measurements”, Systems and Control Letters, 62(7), 2013, pp. 539-549. PDF
  3. I. Karafyllis and M. Krstic, “Robust Predictor Feedback for Discrete-Time Systems with Input Delays”, International Journal of Control, 86(9), 2013, pp. 1652-1663.PDF
  4. I. Karafyllis and Z.-P. Jiang, “Global Stabilization of Nonlinear Systems Based on Vector Control Lyapunov Functions”, IEEE Transactions on Automatic Control, 58(10), 2013, pp. 2550-2562. PDF
  5. I. Karafyllis and M. Krstic, “Stabilization of Nonlinear Delay Systems Using Approximate Predictors and High-Gain Observers”, Automatica, 49(12), 2013, pp. 3623–3631.PDF
  6. I. Karafyllis, “Feedback Stabilization Methods for the Solution of Nonlinear Programming Problems”, Journal of Optimization Theory and Applications, 161(3), 2014, pp. 783-806.PDF
  7. I. Karafyllis, M. Krstic, T. Ahmed-Ali and F. Lamnabhi-Lagarrigue, “Global Stabilization of Nonlinear Delay Systems with a Compact Absorbing Set”, International Journal of Control, 87(5), 2014, pp. 1010-1027. PDF
  8. I. Karafyllis and M. Krstic, “On the Relation of Delay Equations to First-Order Hyperbolic Partial Differential Equations”, ESAIM Control, Optimisation and Calculus of Variations, 20(3), 2014, pp. 894 - 923. PDF
  9. I. Karafyllis and M. Krstic, “Numerical Schemes for Nonlinear Predictor Feedback”, Mathematics of Control, Signals and Systems, 26(4), 2014, pp. 519-546.PDF

58.  I. Karafyllis, M. Malisoff, M. de Queiroz, M. Krstic and R. Yang, “Predictor-Based Tracking for Neuromuscular Electrical Stimulation”, International Journal of Robust and Nonlinear Control, 25(14), 2015, pp. 2391-2419. PDF

59.  I. Karafyllis and M. Papageorgiou, “Global Exponential Stability for Discrete-Time Networks with Applications to Traffic Networks”, IEEE Transactions on Control of Network Systems, 2(1), 2015, pp. 68-77. PDF

60.  I. Karafyllis, M. Kontorinaki and M. Papageorgiou, “Global Exponential Stabilization of Freeway Models”, International Journal of Robust and Nonlinear Control, 26(6), 2016, pp. 1184-1210. PDF

61.  I. Karafyllis and M. Krstic, “Sampled-Data Stabilization of Nonlinear Delay Systems with a Compact Absorbing Set”, SIAM Journal on Control and Optimization, 54(2), 2016, pp. 790–818. PDF

62.  I. Karafyllis and M. Papageorgiou, “Stability Results for Simple Traffic Models Under PI-Regulator Control”, to appear in the IMA Journal of Mathematical Control and Information (see also arXiv:1308.2505 [math.OC]).

63.  I. Karafyllis and M. Krstic, “ISS With Respect to Boundary Disturbances for 1-D Parabolic PDEs”, to appear in IEEE Transactions on Automatic Control (see also arXiv:1505.06457 [math.OC]).

 

 

 

Papers submitted:

S1. I. Karafyllis and M. Krstic, “Stability of Integral Delay Equations and Stabilization of Age-Structured Chemostats”, submitted to ESAIM Control, Optimisation and Calculus of Variations.

S2. I. Karafyllis, M. Kontorinaki and M. Papageorgiou, “Robust Global Adaptive Exponential Stabilization of Discrete-Time Systems with Application to Freeway Traffic Control”, submitted to IEEE Transactions on Automatic Control (see also arXiv:1509.00257 [math.OC]).

S3. I. Karafyllis and M. Krstic, “Global Dynamical Solvers for Nonlinear Programming Problems”, submitted to SIAM Journal on Control and Optimization (see also arXiv:1512.06955 [math.OC]).

S4. T. Ahmed-Ali, I. Karafyllis, F. Giri, M. Krstic, F. Lamnabhi-Lagarrigue, “Exponential Stability Analysis of Sampled-Data ODE-PDE Systems and Application to Observer Design”, submitted to IEEE Transactions on Automatic Control.

S5. X. Li, R. Wang, X.-M. Sun and I. Karafyllis, “Stability Analysis for Uncertain Systems with Time-Varying Delay: A Switching Method”, submitted to Automatica.

S6. I. Karafyllis and M. Krstic, “ISS in Different Norms for 1-D Parabolic PDEs With Boundary Disturbances”, submitted to SIAM Journal on Control and Optimization (see also arXiv:1605.01364 [math.OC]).

 

 

 

Other Information: Associate Editor for the American Control Conference 2009, 2010, 2011, 2012, 2013, 2014, 2015 and the IEEE Conference on Decision and Control 2009, 2010, 2011, 2012, 2013, 2014. Member of the Technical Program Committee of the Chinese Control and Decision Conference 2011, 2012, 2013, 2014. Member of the International Program Committee of the European Control Conference 2015.

Associate Editor for the International Journal of Control (2013-now).
Associate Editor for IMA Journal of Mathematical Control and Information (2013-now).
Associate Editor for the Journal of Control and Decision (2015-now).

Reviewer for the following journals: Automatica, IEEE Transactions on Automatic Control, Mathematics of Control Signals and Systems, IMA Journal of Mathematical Control and Information, SIAM Journal on Control and Optimization, International Journal of Robust and Nonlinear Control, International Journal of Control, European Journal of Control, Systems and Control Letters, Journal of Difference Equations and Applications.

Reviewer for Mathematical Reviews (American Mathematical Society).

 

A few words about Mathematical Control Theory: here

 

 

Useful Links:

Mathematical Control Theory’s Journals

 

1) SIAM Journal on Control and Optimization (see here )

2) Mathematics of Control, Signals and Systems (see here )

3) International Journal of Control (see here )

4) IMA Journal of Mathematical Control and Information (see here )

5) Systems and Control Letters (see here )

6) IEEE Transactions on Automatic Control (see here )

7) International Journal of Robust and Nonlinear Control (see here )

8) Automatica (see here )

9) European Journal of Control (see here )

10) ESAIM Control, Optimisation and Calculus of Variations (see here)

 

There are many more journals publishing engineering-oriented results, which are not listed above. The following journals are focused on areas of mathematics related to mathematical control theory and one can find important papers on control issues (sometimes viewed from a wider or narrower perspective):

 

11) Journal of the Franklin Institute (see here)

12) Journal of Mathematical Analysis and Applications (see here )

13) Nonlinear Analysis: Theory, Methods and Applications (see here )

14) Journal of Differential Equations (see here )

15) Journal of Difference Equations and Applications (see here )

16) Journal of Economic Dynamics and Control (see here )

17) Journal of Optimization Theory and Applications (see here )

18) Nonlinear Analysis Real World Applications (see here )

19) Computers and Mathematics with Applications (see here )

20) Science in China Series F: Information Sciences (see here )

21) Discrete and Continuous Dynamical Systems: Series B (see here )


 

 

 

Links to Coauthors: 

 

1)      Costas Kravaris (see here )

2)      Zhong-Ping Jiang (see here )

3)      Pierdomenico Pepe (see here )

4)      Lars Grüne (see here )

5)      Miroslav Krstic (see here )

6)      Tarek Ahmed-Ali (see here )

7)      Francoise Lamnabhi-Lagarrigue (see here )

8)      Markos Papageorgiou (see here )

9)      Michael Malisoff (see here )

10)  Frédéric Mazenc (see here )

 

webpage last updated : May 30 2016