Ferenc Hartung
Curriculum Vitae
   June 2018

Education:

May 1986  M.S. in Mathematics, József A. University, Szeged, Hungary
January 1995  PhD in Applied Math., University of Texas at Dallas
Title of dissertation: On classes of functional differential equations with state-dependent delays, Advisor: Janos Turi
July 1997  PhD in Mathematics, József A. University, Szeged, Hungary
December 2010 habilitation, University of Szeged, Szeged, Hungary
October 2012 DSc, Hungarian Academy of Sciences
Title of dissertation: Differentiability of solutions with respect to parameters in differential equations with state-dependent delays

Professional Experience:

Sept. 1986 - Sept. 1989  Research Assistant
Szent-Györgyi A. Medical University, Szeged, Hungary
Oct. 1989 - July 1993 Research Fellow
Szent-Györgyi A. Medical University, Szeged, Hungary
Sept 1991 – Dec 1994 Teaching Assistant 
University of Texas at Dallas, USA
Jan. 1995 - Aug. 1995  Lecturer 
University of Texas at Dallas, USA
Sept. 1995 - May 1996 Lecturer
Virginia Polytechnic Institute & State University, USA
June 1996  Research Associate
Virginia Polytechnic Institute & State University, USA
Aug. 1996 – Febr.1998 Assistant Professor
University of Veszprém, Veszprém, Hungary
March 1998 –  Aug 2012 Associate Professor
University of Pannonia (earlier name: University of Veszprém), Veszprém, Hungary
Sept 2012 –  Professor
University of Pannonia, Veszprém, Hungary

Current Fields of Interest:

Functional differential equations, difference equations, numerical approximation, parameter estimation.

List of publications with citations from MTMT database

Papers Appeared:

  1. I. Gyri, F. Hartung and J. Turi, Stability in delay equations with perturbed time lags, Proceedings of the 32nd IEEE CDC, San Antonio, Texas, USA, 1993, 3829-3830. (PDF)
  2. F. Hartung, T. L. Herdman and J. Turi, Identification of parameters in hereditary systems: a numerical study, Proceedings of the 3rd IEEE Mediterranean Symposium on New Directions in Control and Automation, Cyprus, July, 1995, 291-298.  (PDF)
  3. F. Hartung and J. Turi, On the asymptotic behavior of the solutions of a state-dependent delay equation, Differential and Integral Equations, 8:7 (1995) 1867-1872.  (PDF)
  4. F. Hartung, T. L. Herdman and J. Turi, Identification of parameters in hereditary systems, Proceedings of ASME Fifteenth Biennial Conference on Mechanical Vibration and Noise, Boston, Massachusetts, September 1995, DE-Vol. 84-3, 1995 Design Engineering Technical Conferences, Vol 3 - Part C, ASME 1995, 1061-1066.  (PDF)
  5. I. Gyri, F. Hartung and J. Turi, On numerical approximations for a class of differential equations with time- and state-dependent delays, Applied Mathematics Letters, 8:6 (1995) 19-24.  (PDF)
  6. F. Hartung and J. Turi, Stability in a class of functional differntial equations with state-dependent delays, in Qualitative Problems for Differential Equations and Control Theory, ed. C. Corduneanu, Word Scientific, 1995, 15-31.  (PDF)
  7. I. Gyri, F. Hartung and J. Turi, On the effects of delay perturbations on the stability of delay difference equations, Proceedings of the First International Conference on Difference Equations, San Antonio, Texas, May 1994, eds. S. N. Elaydi, J. R. Graef, G. Ladas and A. C. Peterson, Gordon and Breach, 1995, 237-253.   (PDF)
  8. I. Gyri, F. Hartung and J. Turi, On numerical solutions for a class of nonlinear delay equations with time- and state-dependent delays, Proceedings of the World Congress of Nonlinear Analysts, Tampa, Florida, August 1992, Walter de Gruyter, Berlin, New York, 1996, 1391-1402.   (PDF)
  9. F. Hartung and J. Turi, On differentiability of solutions with respect to parameters in state-dependent delay equations, J. Differential Equations, 135:2 (1997) 192-237.   (PDF)
  10. F. Hartung, T. L. Herdman and J. Turi, On existence, uniqueness and numerical approximation for neutral equations with state-dependent delays, Applied Numerical Mathematics, 24:2-3 (1997) 393-409.  (PDF)
  11. F. Hartung and J. Turi, Identification of parameters in delay equations with state-dependent delays, J. Nonlinear Analysis: Theory, Methods and Applications, 29:11 (1997) 1303-1318.  (PDF)
  12. F. Hartung, On differentiability of solutions with respect to parameters in a class of functional differential equations, Functional Differential Equations, 4:1-2 (1997) 65-79.  (PDF)
  13. F. Hartung, T. L. Herdman and J. Turi, Parameter identification in classes of hereditary systems of neutral type, Applied Mathematics and Computation, 89 (1998) 147-160.  (PDF)
  14. I. Gyri, F. Hartung and J. Turi, Preservation of stability in delay equations under delay perturbations, J. Math. Anal. Appl., 220 (1998) 290-312.  (PDF)
  15. F. Hartung, T. L. Herdman and J. Turi, Parameter identifications in classes of neutral differential equations with state-dependent delays, J. Nonlinear Analysis: Theory, Methods and Applications, 39:3 (2000) 305-325.  (PDF)
  16. I. Gyri and F. Hartung, On the exponential stability of a state-dependent delay equation, Acta Sci. Math. (Szeged), 66 (2000) 71-84.  (PDF)
  17. F. Hartung and J. Turi, Linearized stability in functional-differential equations with state-dependent delays, Proceedings of the conference Dynamical Systems and Differential Equations (Kennesaw, GA, 2000), added volume of Discrete and Continuous Dynamical Systems, 2001, 416-425.  (PDF)
  18. I. Gyri and F. Hartung, Stability in delay perturbed differential and difference equations, In Topics in Functional Differential and Difference Equations, Fields Institute Communications, Vol. 29 (2001) 181-194.  (PDF)
  19. I. Gyri and F. Hartung, Preservation of stability in a linear neutral differential equation under delay perturbations, Dynamic Systems and Applications, 10 (2001) 225-242.  (PDF)
  20. F. Hartung, Parameter estimation by quasilinearization in functional differential equations with state-dependent delays: a numerical study, J. Nonlinear Analysis: Theory, Methods and Applications, 47:7 (2001) 4557-4566.  (PDF)
  21. I. Gyri and F. Hartung, On equi-stability with respect to parameters in functional differential equations, Nonlinear Functional Analysis and Applications, 7:3 (2002) 329-351. (PDF)
  22. I. Gyri and F. Hartung, Numerical approximation of neutral differential equations on infinite interval, J. Difference Eqns Appl., 8:11 (2002) 983-999.  (PDF)
  23. I. Gyri and F. Hartung, Stability analysis of a single neuron model with delay, J. Computational and Applied Mathematics, 157:1 (2003) 73-92. (PDF
  24. I. Gyri and F. Hartung, On stability of neural networks with delays, Proceedings of the conference Science, Education and Society, ilina, Slovak Republic, September 17-19, 2003, Section No. 7., Mathematics in Interdisciplinary Context, University of ilina, 2003, 15-18.  (PDF)
  25. I. Gyri and F. Hartung, Stability results for cellular neural networks with delays, Proc. 7'th Colloq. Qual. Theory Differ. Equ., Electronic Journal of Qualitative Theory of Differential Equations, No. 13 (2004) pp. 1-14.  (PDF)
  26. F. Hartung, Linearized Stability  in Periodic Functional Differential Equations with State-Dependent Delays, J. Computational and Applied Mathematics, 174 (2005) 201-211.  (PDF)
  27. T. Insperger, G. Stépán, F. Hartung, J. Turi, State dependent regenerative delay in milling processes, in Proceedings of ASME International Design Engineering Technical Conferences, Long Beach CA, (2005), paper no. DETC2005-85282 (CD-ROM).  (PDF)
  28. F. Hartung and J. Turi, Identification of Parameters in Neutral Functional Differential Equations with State-Dependent Delays, Proceedings of 44th IEEE Conference on Decision and Control and European Control Conference ECC 2005, Seville, (Spain). 12-15 December 2005, 5239-5244. (PDF)
  29. I. Gyri and F. Hartung, Fundamental solution and asymptotic stability of linear delay differential equations, Dynamics of Continuous, Discrete and Impulsive Systems, 13:2 (2006) 261-288.  (PDF)
  30. F. Hartung, T. Insperger, G. Stépán, J. Turi, Approximate stability charts for milling processes using semi-discretization, Applied Mathematics and Computation, 174:1 (2006) 51-73.  (PDF)
  31. F. Hartung, On differentiability of solutions with respect to parameters in neutral differential equations with state-dependent delays, J. Math. Anal. Appl., 324:1 (2006) 504-524. (PDF)
  32. F. Hartung, T. Krisztin, H.-O. Walther, and J. Wu, Functional differential equations with state-dependent delay: theory and applications, in Handbook of Differential Equations: Ordinary Differential Equations, volume 3, edited by A. Canada, P. Drábek and A. Fonda, Elsevier, North-Holand, 2006, 435-545.
  33. I. Gyri, F. Hartung, Exponential Stability of a State-Dependent Delay System, Discrete and Continuous Dynamical Systems - Series A, 18:4 (2007) 773-791. (PDF)
  34. I. Gyri, F. Hartung, Stability results for Cohen-Grossberg neural networks with delays, Int. J. Qualitative Theory of Differential Equations and Applications, 1:2 (2007) 142-156. (PDF)
  35. I. Gyri, F. Hartung, On numerical approximation using equations with piecewise constant arguments, Periodica Mathematica Hungarica, 56:1 (2008) 55-69, DOI: 10.1007/s10998-008-5055-5. (PDF)
  36. F. Hartung, Linearized Stability for a Class of Neutral Functional Differential Equations with State-Dependent Delays, J. Nonlinear Analysis: Theory, Methods and Applications, 69 (2008) 1629–1643. (PDF)
  37. J. Radó, F. Hartung and P. Iványi, Studying the Quality Measures for Finite Element Meshes with Triangular Elements, Proceedings of the Sixth International Conference on Engineering Computational Technology, M. Papadrakakis and B.H.V. Topping, (Editors), Civil-Comp Press, Stirlingshire, Scotland, 2008, paper no. 54 (CD-ROM).
  38. J. Radó, P. Iványi and F. Hartung, Triangular Based Finite Element Mesh Smoothing, Triangular Based Finite Element Mesh Smoothing, Proceedings of the 26th International Conference Science in Practice, Osijek, Croatia, May 2008, J.J. Strossmayer Univ. of Osijek, 2008, 101-106.
  39. I. Gyri, F. Hartung, On the Exponential Stability of a Nonlinear State-Dependent Delay System, in Advances in Mathematical Problems in Engineering Aerospace and Sciences, vol.3, Advances in Nonlinear Analysis: Theory, Methods and Applications, ed. S. Sivasundaram, J. Vasundhara Devi, Z. Drici, F. Mcrae. Cambridge, UK: Cambridge Scientific Publishers Ltd, 2009, 39-48. (PDF)
  40. J. Radó, F. Hartung, P. Iványi, An Investigation of the Convergence of Mesh Smoothing, in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing, Civil-Comp Press, Stirlingshire, UK, Paper 282, 2009. doi:10.4203/ccp.91.282
  41. I. Gyri, F. Hartung, Asymptotically exponential solutions in nonlinear integral and differential equations, J. Differential Equations 249 (2010) 1322-1352. (PDF)
  42. F. Hartung, Differentiability of solutions with respect to the initial data in differential equations with state-dependent delays, Journal of Dynamics and Differential Equations 23:4 (2011) 843-884, DOI 10.1007/s10884-011-9218-1. (PDF)
  43. I. Gyri, F. Hartung, Asymptotic behavior of nonlinear difference equations, Journal of Difference Equations and Applications 18:9 (2012) 1485-1509.  DOI 10.1080/10236198.2011.574619. (PDF)
  44. E. Awwad, I. Gyri, F. Hartung, BIBO stabilization of feedback control systems with time dependent delays, Applied Mathematics and Computation (2012), doi:10.1016/j.amc.2012.09.065 (PDF)
  45. F. Hartung, On Differentiability of Solutions with respect to Parameters in Neutral Differential Equations with State-Dependent Delays, Annali di Matematica Pura ed Applicata, 192 (2013)  17-47.  DOI 10.1007/s10231-011-0210-5. (PDF)
  46. F. Hartung, J. Turi, Parameter Identification in a Respiratory Control System Model, in Batzel J J, Bachar M, Kappel F (ed.) Mathematical Modeling and Validation in Physiology: Applications to the Cardiovascular and Respiratory Systems, Berlin ; Heidelberg: Springer Verlag, 2013. pp. 105-118. (Lecture Notes in Mathematics; 2064.) Mathematical Biosciences Subseries (PDF)
  47. F. Hartung, Parameter Estimation by Quasilinearization in Differential Equations with State-Dependent Delays, Discrete and Continuous Dynamical Systems-B, 18:6 (2013) 1611-1631.. (PDF)
  48. F. Hartung, On second-order differentiability with respect to parameters for differential equations with state-dependent delays, Journal of Dynamics and Differential Equations, 25 (2013) 1089-1138. DOI 10.1007/s10884-013-9330-5.  (PDF)
  49. I. Gyri, F. Hartung, N. A. Mohamady, On a nonlinear delay population model, Applied Mathematics And Computation, 270 (2015) 909-925. DOI 10.1016/j.amc.2015.08.090 (PDF)
  50. F. Hartung, Nonlinear variation of constants formula for differential equations with state-dependent delays, Journal of Dynamics and Differential Equations, 28 (2016) 1187-1213. DOI 10.1007/s10884-015-9445-y (PDF)
  51. F. Hartung, Differentiability of solutions with respect to the delay function in functional differential equations, Electron. J. Qual. Theory Differ. Equ. 2016, No. 73, 1-16.
  52. I. Gyri, F. Hartung, N. A. Mohamady, Existence and uniqueness of positive solutions of a system of nonlinear algebraic equations, Period. Math. Hung., 75:1 (2017) 114-127. DOI 10.1007/s10998-016-0179-3 (PDF)
  53. I. Gyri, F. Hartung, N. A. Mohamady, Boundedness of positive solutions of a system of nonlinear delay differential equations, Discrete and Continuous Dynamical Systems - Series B, 23:2 (2018) 809-836. (PDF)
  54. I Gyri, F Hartung, N A Mohamady, Permanence in a class of delay differential equations with mixed monotonicity, Electronic Journal of Qualitative Theory of Differential Equations 2018:53 (2018) 1-28. 
  55. Awwad E, Gyri I, Hartung F, BIBO stability of discrete control systems with several time delays, Miskolc Mathematical Notes 19:1 (2018) 95-109.

Edited books:

  1. F. Hartung, M. Pituk M (szerk.), Recent Advances in Delay Differential and Difference Equations, (94) Cham (Németország): Springer International Publishing, 2014. 263 p. (Springer Proceedings in Mathematics and Statistics; 94.) (ISBN:978-3-319-08250-9)

Lecture notes:

  1. F. Hartung: Introduction to numerical analysis (in Hungarian), (VE 1/1999), University of Veszprém, Hungary, Veszprém, 1998; second edition: (VE 17/2004) 2004. 
  2. I. Gyri , F. Hartung, Lecture notes for Mathematical analysis III 180 pages (in Hunarian). 
  3. F. Hartung, Lecture notes in Differential equations. 109 pages (in Hungarian).

Other publications:

  1. Karsai J., Forczek E., Hartung F., The central clinical information system at SZOTE (in Hungarian), Proceedings of the 15th Colloquium on Computing and Cybernetical Methods in Medicine and Biology, 1990, 169--175.
  2. Pavelka Z., Hartung F., Karsai J.,The PDP-PC mailing system at SZOTE (poster, in Hungarian), Proceedings of the 15th Colloquium on Computing and Cybernetical Methods in Medicine and Biology, 1990.
  3. Hartung F., Karsai J., Tordai M., Barna I., The central patient archive at SZOTE (poster, in Hungarian), Proceedings of the 15th Colloquium on Computing and Cybernetical Methods in Medicine and Biology, 1990.
  4. Németh János, Hartung Ferenc, Deák Andrea, Forczek Erzsébet, Számítógépes ambuláns betegnyilvántartó rendszer (in Hungarian), Szemészet, 129; 115-117, 1992.
  5. I. Gyri, F. Hartung and J. Turi, Approximation of functional differential equations with time- and state-dependent delays by equations with piecewise constant arguments, Univ. of Minnesota, USA, IMA Preprint Series #1130, 1993.
  6. F. Hartung, On classes of functional differential equations with state-dependent delays, PhD dissertation, University of Texas at Dallas, 1995. (PDF)
  7. F. Hartung, Differentiability of solutions with respect to parameters in differential equations with state-dependent delays, Dissertation submitted for the degree
    Doctor of the Hungarian Academy of Sciences (DSc), 2011.  (PDF)
  8. F. Hartung, On second-order differentiability with respect to parameters for differential equations with state-dependent delays, arXiv:1201.0269v1 [math.DS] 31 Dec 2011. http://arxiv.org/abs/1201.0269

Conference talks:

  1. Stability in delay equations with perturbed time lags, 32nd IEEE Conference on Decision and Control, San Antonio, Texas, USA, 1993. december.
  2. On the effects of delay perturbations on the stability of delay difference equations, First International Conference on Difference Equations, San Antonio, Texas, USA, 1994. május.
  3. Differentiability with respect to parameters in functional differential equations with state-dependent delays, 23rd Midwest Differential Equations Conference, Norman, Oklahoma, USA, 1994. október.
  4. On classes of differential equations with state-dependent delays,14th Southeastern Atlantic Regional Conference on Differential Equations, Knoxville, Tennessee, USA, 1994. október.
  5. 15th  Regional Conference on Differential Equations, Raleigh, North Carolina, USA, 1995. október.
  6. International Conference on Dynamical Systems & Differential Equations, Springfield, Missouri, USA, 1996. május.
  7. Conference on Dynamical Systems in Biology and Medicine, Veszprém, 1996. július.
  8. Fifth Colloquium on the Qualitative Theory of Differential Equations, Szeged, 1996. július.
  9. Parameter identification in functional differential equations with state-dependent delays, Functional Differential-Difference Equations and Applications, Antalya, Törökország, 1997. augusztus.
  10. On differentiability of solutions with respect to parameters in state-dependent delay equations, Equadiff 9, Conference on Differential Equations and their Applications, Brno, Csehország, 1997. augusztus. 
  11. Parameter identification in functional differential equations, Borvka Mathematical Symposium, Brno-Valtice, Csehország, 1999 május. 
  12. Preservation of stability in functional differential equations under delay perturbations, Sixth Colloquium on the Qualitative Theory of Differential Equations, Szeged, 1999. augusztus.
  13. Parameter identification in functional differential equations with state-dependent delays, The Third World Congress of Nonlinear Analysts, Catania, Olaszország, 2000. július 19-26.
  14. Stability in delay perturbed differential equations, Brno Colloquium on Differential and Difference Equations, Brno, Csehország, 2000. szeptember 5-8. 
  15. Asymptotic stability of functional differential equations with state-dependent delays, Equadiff 10, Conference on Differential Equations and their Applications, Prága, Csehország, 2001. augusztus 27-31.
  16. Numerical Approximation of Neutral Differential Equations on Infinite Interval, Colloquium on Differential and Difference Equations, Brno, Csehország, 2002. szeptember 3-6.
  17. Stability in State-Dependent Delay Equations, Applied Mathematics and Application of Mathematics, Nice, France, 2003. február 10-13. (in invited section)
  18. On stability of functional differential equations with state-dependent delays, Fourth International Conference on Dynamic Systems and Applications, Atlanta, USA, 2003. május 21-24. (in invited section)
  19. On stability of neural network models, Seventh Colloquium on the Qualitative Theory of Differential Equations, Szeged Hungary, July 14-18, 2003.
  20. On numerical approximation using equations with piecewise constant arguments, Delay Differential and Difference Equations with Applications, Veszprém, Hungary, August 25-29, 2003.
  21. On differentiability of solutions of state-dependent FDEs with respect to parameters, Fifth International Conference on Dynamical Systems and Differential Equations, Pomona, CA, USA, June 16-19, 2004. (in invited section)
  22. On stability of neural networks with delays, Fourth World Congress of Nonlinear Analysts, Orlando, FL, USA, June 30-July 7, 2004. (in invited section)
  23. On differentiability of solutions with respect to parameters in neutral differential equations with state-dependent delays, Conference on Differential & Difference Equations and Applications, Melbourne, FL, USA, Aug 1-5, 2005 (in invited section).
  24. On the problem of linearization for functional differential equations with state-dependent delays, Sixth International Conference on Dynamical Systems and Differential Equations, Univerity of Poitiers, Poitiers, France, June 25-28, 2006 (in invited section).
  25. Linearized stability in neutral differential equations with state-dependent delays, The 5th International Conference on Differential Equations and Dynamical Systems, University of Texas-Pan American, Edinburg, Texas, USA, December 16-18, 2006 (in invited section).
  26. Linearized stability in functional differential equations with state-dependent delays, Eighth Colloquium on the Qualitative Theory of Differential Equations, Szeged Hungary, June 25-28, 2007 (in invited section).
  27. Neutral differential equations with state-dependent delays, EQUADIFF 2007, August 5-11, 2007 (in invited section).
  28. Neutral differential equations with state-dependent delays, Joint AARMS-CRM Workshop: Recent Advances in Functional and Delay Differential Equations, November 1-5, 2007, Halifax, Canada (invited talk).
  29. On stability in functional differential equations with state-dependent delays, Fifth World Congress of Nonlinear Analysts Orlando, FL, USA, July 2-9, 2008 (in invited section).
  30. On linearized stability in state-dependent delay equations, International Conference on Differential and Difference Equations, July 14-17, 2008, Veszprém, Hungary.
  31. On linearized stability of neutral differential equations with state-dependent delays, Conference on Boundary Value Problems: Mathematical Models in Engineering, Biology and Medicine, Santiago de Compostela, Spain, September 15-20, 2008 (in invited section).
  32. On parameter dependence in functional differential equations with state-dependent delays, 7th International ISAAC Congress, Imperial College, London, United Kingdom, July 13-18, 2009 (in invited section).
  33. Parameter estimation by quasilinearization in functional differential equations with state-dependent delays, Workshop on delay differential equations: from theory to applications, Bristol, September 7-9, 2009 (invited talk).
  34. On linearized stability in functional differential equations with state-dependent delays, International Workshop on State-Dependent Delay Equations, Dresden, Germany, October 12-16, 2009 (invited talk).
  35. Asymptotic behavior of nonlinear Volterra integral equations, 8th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Dresden University of Technology, Dresden, Germany, May 25-28, 2010 (invited talk).
  36. Smooth dependence of the solutions on initial data in state-dependent delay equations, Low dimensional structures in dynamical systems with variable time lags, American Institute of Mathematics, Palo Alto, California, USA, June 7-11, 2010 (invited talk).
  37. Asymptotic behavior of nonlinear difference equations, Progress on Difference Equations, Dublin, Ireland, May 23-27, 2011 (invited talk).
  38. On second order differentiability with respect to parameters for differential equations with state-dependent delays, 9th Colloquium on the Qualitative Theory of Differential Equations, Szeged, Hugary, June 28-July 1, 2011 (invited talk)
  39. On differentiability of solutions with respect to parameters in neutral differential equations with state-dependent delays, Equadiff 2011, Loughborough, United Kingdom, August 1-5, 2011 (invited talk)
  40. Parameter estimation by quasilinearization in differential equations with state-dependent delays, Szeged – Timioara Workshop on Differential Equations, Szeged, April 20-22, 2012.
  41. Parameter estimation by quasilinearization in differential equations with state-dependent delays, Recent trends in delay differential equations: models, theory and numerics, June 4-8, 2012, Cortona, Italy (invited talk).             
  42. Smooth dependence on parameters of solutions in functional differential equations with state-dependent delays, 6th European Congress of Mathematics, Mini-symposium Infinite-dimensional Dynamical Systems with Time Delays, Kraków, Poland, July 2-8, 2012 (invited talk).
  43. Asymptotic behavior of nonlinear difference equations, 18th International Conference on Difference Equations and Applications, Barcelona, Spain, July 23–27, 2012 (invited talk).
  44. On neutral differential equations with time-dependent delays, Szeged Dynamics Days, February 28-March 1, 2014.
  45. Well-posedness and parameter identification problems in a class of neutral differential equations with state-dependent delays, International Conference on Nonlinear Differential and Difference Equations: Recent Developments and Applications, Antalya, Turkey, May 27-30, 2014. (invited talk)
  46. On neutral neutral differential equations with state-dependent delays, 10th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Madrid, Spain, July 7-11, 2014. (invited talk)
  47. On differentiability of solutions with respect to initial data in differential equations with state-dependent delays, Differential equations with variable delay Fields Institute, Toronto, Canada, May 4-8, 2015 (invited talk)
  48. Nonlinear variation of constants formula for differential equations with state-dependent delays, 10th Colloquium on the Qualitative Theory of Differential Equations, Szeged, Hungary, 1-4 July, 2015 (invited talk)
  49. Differentiability of solutions with respect to the delay function in functional differential equations, The 6th World Congress on Engineering and Technology, October 21-23, 2016, Shanghai, China
  50. On permanence of differential equations with delays, International Conference on Differential and Difference Equations and Applications, June 5-9, 2017, Amadora, Portugal (invited talk)

Seminars, workshops:

  1. On classes of functional differential equations with state-dependent delays, Center for Applied Mathematics, Virginia Polytechnic Institute & State University, Blacksburg, Virginia, March 1995.
  2. Állapotfügg késleltetés retardált differenciálegyenletek megoldásainak paraméter szerinti differenciálhatóságáról (in Hungarian), József A. University, Szeged, Hungary, March 13, 1997.
  3. Állapotfügg késleltetés neutrális differenciálegyenletek egy osztályáról (in Hungarian), Regional Centre of the Hungarian Academy of Sciences, Veszprém, Hungary, June 19, 1997.
  4. Paraméter becslés funkcionál-differenciálegyenletekre (in Hungarian), Széchenyi István University, Gyr, Hungary, June 17, 1998.
  5. Késleltetésben perturbált funkcionál-differenciálegyenletek stabilitásáról (in Hungarian), Regional Centre of the Hungarian Academy of Sciences, Veszprém, Hungary, October 25, 1999.
  6. Állapotfügg késleltetés funkcionál-differenciálegyenletek megoldásainak paraméter szerinti differenciálhatóságáról (in Hungarian), Budapest University of Technology and Economics, Institute of Mathematics, Department of Differential Equations, December 7, 2000.
  7. Matematika programcsomagok oktatása (in Hungarian), Informatika és kommunikáció az oktatásban, Szombathely, March 29-31, 2001.
  8. Semi-discretization of functional differential equations modeling milling processes, Regional Centre of the Hungarian Academy of Sciences, Veszprém, Hungary, May 17, 2004.
  9. Fundamental solutions and asymptotic stability of linear delay equations, Regional Centre of the Hungarian Academy of Sciences, Veszprém, Hungary, May 17, 2004.
  10. On stability of linear delay seytems using perturbation methods, University of Texas at Dallas, Richardson, TX, USA, June 29, 2004.
  11. Állapotfügg késleltetés neutrális egyenletekrl (in Hungarian), József A. University, Szeged, Hungary, February 10, 2005.
  12. Állapotfügg késleltetés neutrális differenciálegyenletek megoldásainak paraméter szerinti differenciálhatósága (in Hungarian), Regional Centre of the Hungarian Academy of Sciences, Veszprém, Hungary, May 31, 2005.
  13. Applications of delay equations, 4-hour lecture at the Sarajevo Summer School on Mathematical Techniques in Modeling Physiological Systems, Sarajevo, Bosnia-Hercegovina, September 10-22, 2006.
  14. Linearizált stabilitás állapotfügg késleltetés egyenletekre (in Hungarian), Regional Centre of the Hungarian Academy of Sciences, Veszprém, Hungary, October 11, 2006.
  15. On stability of delay systems using perturbation methods, Departmento de Matemática Aplicada, Uiversidad Nacional de Educación a Distancia (UNED), Madrid, Spain, October 30, 2006.
  16. On stability in functional differential equations with state-dependent delays, Department of Applied Mathematics II, University of Vigo, Vigo, Spain, October 31, 2006.
  17. Linearized stability for neutral differential equations with state-dependent delays, Department of Mathematical Analysis, University of Santiago, Stantiago de Compostela, Spain, November 2, 2006.
  18. Matematika oktatás a Pannon Egyetemen (in Hungarian), Matematika oktatás mérnök és mszaki informatikai képzésekben, Ráckeve, Hungary, March 2, 2007.
  19. Neutrális állapotfügg késleltetés differenciálegyenletek (in Hungarian), Széchenyi István University, Gyr, Hungary, October 5, 2007..
  20. Parameter estimation in functional differential equations with state-dependent delays, Széchenyi István University, Gyr, Hungary, May 22, 2009.
  21. Állapotfügg késleltetés differenciálegyenletek (in Hungarian), Differenciálegyenletek, Tudományos ülés, Hungarian Academy of Sciences, Budapest, May 27, 2009.
  22. On state-dependent delay equations, MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, (in Hungarian) Veszprém, September 30, 2009.
  23. Asymptotically exponential solutions in nonlinear integral, differential and difference equations, University of Texas at Dallas, Richardson, TX, USA, March 2, 2010.
  24. On smooth dependence on parameters in functional differential equations with state-dependent delays, University of Texas-Pan American, Edinburg, TX, USA, April 10, 2010.
  25. On differentiability of solutions with respect to parameters in functional differential equations with state-dependent delays, University of Memphis, TN, USA, April 27, 2010.
  26. On differentiability of solutions with respect to parameters in functional differential equations with state-dependent delays, Virginia Polytechnic Institute & State University, Blacksburg, VA, USA, April 29, 2010.
  27. Állapotfügg késleltetés funkcionál-differenciálegyenletek megoldásainak differenciál-hatósága paraméterek szerint, ELTE, Alkalmazott Analízis és Számításmatematikai Tanszék Szemináriuma, 2010. november 15.
  28. On second order differentiability with respect to parameters of solutions to differential equations with state-dependent delays, University of Valladolid, Valladolid, Spain, 2011. április 19.
  29. Estimation of parameters in neutral differential equations with state-dependent delays using equations with piecewise constant arguments, Workshop on Delay Differential and Difference Equations, Veszprém, Hungary, July 17-18, 2014
  30. Differentiability of solutions with respect to the delay function in functional differential equations, Szeged School on Computational Tools for Delay Differential Equations, 9-11 September, 2016

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Date of birth, place: June 5, 1962, Budapest, Hungary
Married (Maria), has a son (István) and a daughter (Éva).