Ferenc Hartung
Curriculum Vitae
   September 2024

Education:

Professional Experience:

Current Fields of Interest:

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

List of publications with citations from MTMT database

Papers Appeared:

1. F. Hartung, On differentiability of solutions with respect to parameters in impulsive differential equations with adaptive state-dependent delay, J. Differential Equations, 413 (2024) 751-804.
2. F. Hartung, On numerical approximation of a delay differential equation with impulsive self-support condition, Applied Mathematics and Computation 418 (2022) 126818, 1-21.
3. F. Hartung, Differentiability of Solutions with respect to Parameters in a Class of Neutral Differential Equations with State-Dependent Delays, Electron. J. Qual. Theory Differ. (2021) 2021, No. 56, 1-41.
4. S. P. Pradhan, F. Hartung, J. Turi, Dynamics in a Respiratory Control Model With Two Delays, Applications and Applied Mathematics 14:2 (2019) 863-874.
5. Awwad E, Győri I, Hartung F, BIBO stability of discrete control systems with several time delays, Miskolc Mathematical Notes 19:1 (2018) 95-109.
6. I Győri, 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. 
7. I. Győri, 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)
8. I. Győri, 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)
9. 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.
10. F. Hartung, Nonlinear variation of constants formula for differential equations with state-dependent delays, Journal of Dynamics and Differential Equations, 28:3-4 (2016) 1187-1213. DOI 10.1007/s10884-015-9445-y (PDF)
11. I. Győri, 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)
12. 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)
13. 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)
14. 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)
15. 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)
16. E. Awwad, I. Győri, 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)
17. I. Győri, 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)
18. 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)
19. I. Győri, F. Hartung, Asymptotically exponential solutions in nonlinear integral and differential equations, J. Differential Equations 249 (2010) 1322-1352. (PDF)
20. 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
21. I. Győri, 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)
22. J. Radó, P. Iványi and F. Hartung, Triangular Based Finite Element Mesh Smoothing, Triangular Based Finite Element Mesh Smoothing, Proceedings of the 26^th International Conference Science in Practice, Osijek, Croatia, May 2008, J.J. Strossmayer Univ. of Osijek, 2008, 101-106.
23. 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).
24. 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)
25. I. Győri, 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)
26. I. Győri, 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)
27. I. Győri, F. Hartung, Exponential Stability of a State-Dependent Delay System, Discrete and Continuous Dynamical Systems - Series A, 18:4 (2007) 773-791. (PDF)
28. 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. (PDF)
29. 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)
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. I. Győri 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)
32. 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)
33. 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)
34. F. Hartung, Linearized Stability  in Periodic Functional Differential Equations with State-Dependent Delays, J. Computational and Applied Mathematics, 174 (2005) 201-211.  (PDF)
35. I. Győri 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)
36. I. Győri and F. Hartung, On stability of neural networks with delays, Proceedings of the conference Science, Education and Society, Žilina, Slovak Republic, September 17-19, 2003, Section No. 7., Mathematics in Interdisciplinary Context, University of Žilina, 2003, 15-18.  (PDF)
37. I. Győri and F. Hartung, Stability analysis of a single neuron model with delay, J. Computational and Applied Mathematics, 157:1 (2003) 73-92. (PDF) 
38. I. Győri and F. Hartung, Numerical approximation of neutral differential equations on infinite interval, J. Difference Eqns Appl., 8:11 (2002) 983-999.  (PDF)
39. I. Győri 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)
40. 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)
41. I. Győri and F. Hartung, Preservation of stability in a linear neutral differential equation under delay perturbations, Dynamic Systems and Applications, 10 (2001) 225-242.  (PDF)
42. I. Győri 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)
43. 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)
44. I. Győri and F. Hartung, On the exponential stability of a state-dependent delay equation, Acta Sci. Math. (Szeged), 66 (2000) 71-84.  (PDF)
45. 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)
46. I. Győri, F. Hartung and J. Turi, Preservation of stability in delay equations under delay perturbations, J. Math. Anal. Appl., 220 (1998) 290-312.  (PDF)
47. 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)
48. 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)
49. 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)
50. 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)
51. 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)
52. I. Győri, 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)
53. I. Győri, 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)
54. 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)
55. I. Győri, 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)
56. 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)
57. 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)
58. 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)
59. I. Győri, 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)

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, 365 pages. 
2. I. Győri , F. Hartung, Lecture notes for Mathematical analysis III 180 pages (in Hunarian). 
3. F. Hartung, Lecture notes in Differential equations. 109 pages (in Hungarian).
4. F. Hartung, Introduction to numerical analysis, Digitális Tankönyvtár, http://dtk.tankonyvtar.hu/xmlui/handle/123456789/2891, 2019, 214 pages
5. Hartung F, Introduction to numerical analysis (in Hungarian), 2020, 191 pages.

Other publications:

1. A. R. Goswami, F. Hartung , Hermite-Hadamard type inequalities by using Newton-Cotes quadrature formulas, arXiv:2401.08620 [math.GM], 2023.
2. 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 
3. 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)
4. F. Hartung, On classes of functional differential equations with state-dependent delays, PhD dissertation, University of Texas at Dallas, 1995.  (PDF)
5. I. Győri, 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. Németh János, Hartung Ferenc, Deák Andrea, Forczek Erzsébet, Számítógépes ambuláns betegnyilvántartó rendszer. Szemészet, 129; 115-117, 1992.
7. 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.
8. 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.
9. 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.

Conference talks:

1. On the application of equations with piecewise constant arguments for stability of difference equations and numerical approximation of functional differential equations, 29th International Conference on Difference Equations and Applications, 24-28 June 2024 Paris, France
2. On numerical approximation of functional differential equations with impulses using equations with piecewise constant arguments, 12th Colloquium on the Qualitative Theory of Differential Equations, Szeged, Hungary, June 19-23, 2023 (invited talk)
3. Egy impulzív önfenntartó késleltetett differenciálegyenlet numerikus közelítése, Szeged Dynamics Days, February 23, 2023 (invited talk)
4. Differentiability of Solutions with respect to Parameters in a Class of Neutral Differential Equations with State-Dependent Delays, Equadiff 15, 11-15 July 2022, Brno, Czech Republic. (invited talk)
5. Permanence in a class of delay differential equations with mixed monotonicity, 9th International Congress on Industrial and Applied Mathematics, Valencia, Spain, July 15-19, 2019. (invited talk)
6. On the quasilinearization method for a parameter estimation problem in neutral functional differential equations with state-dependent delays, 11th Colloquium on the Qualitative Theory of Differential Equations, Szeged, Hungary, June 17-21, 2019. (invited talk)
7. On the quasilinearization method for a parameter estimation problem in a class of functional differential equations with state-dependent delays, 14th IFAC Workshop on Time Delay Systems, Budapest, June 28-30, 2018
8. Permanence in a class of delay differential equations with mixed monotonicity, Szeged Dynamics Days, June 26-27, 2018 (meghívott előadás) 
9. On permanence of differential equations with delays, International Conference on Differential and Difference Equations and Applications, June 5-9, 2017, Amadora, Portugal (invited talk)
10. 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
11. 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)
12. 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)
13. 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)
14. 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)
15. On neutral differential equations with time-dependent delays, Szeged Dynamics Days, February 28-March 1, 2014.
16. Asymptotic behavior of nonlinear difference equations, 18th International Conference on Difference Equations and Applications, Barcelona, Spain, July 23–27, 2012 (invited talk).
17. Smooth dependence on parameters of solutions in functional differential equations with state-dependent delays, 6^th European Congress of Mathematics, Mini-symposium Infinite-dimensional Dynamical Systems with Time Delays, Kraków, Poland, July 2-8, 2012 (invited talk).
18. 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).             
19. Parameter estimation by quasilinearization in differential equations with state-dependent delays, Szeged – Timişoara Workshop on Differential Equations, Szeged, April 20-22, 2012.
20. 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)
21. 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)
22. Asymptotic behavior of nonlinear difference equations, Progress on Difference Equations, Dublin, Ireland, May 23-27, 2011 (invited talk).
23. 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).
24. 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).
25. 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).
26. 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).
27. On numerical approximation using equations with piecewise constant arguments, Delay Differential and Difference Equations with Applications, Veszprém, Hungary, August 25-29, 2003.
28. 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).
29. 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).
30. On linearized stability in state-dependent delay equations, International Conference on Differential and Difference Equations, July 14-17, 2008, Veszprém, Hungary.
31. 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).
32. 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).
33. Neutral differential equations with state-dependent delays, EQUADIFF 2007, August 5-11, 2007 (in invited section).
34. 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).
35. 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).
36. 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).
37. 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).
38. On stability of neural networks with delays, Fourth World Congress of Nonlinear Analysts, Orlando, FL, USA, June 30-July 7, 2004. (in invited section)
39. 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)
40. On stability of neural network models, Seventh Colloquium on the Qualitative Theory of Differential Equations, Szeged Hungary, July 14-18, 2003.
41. 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)
42. Stability in State-Dependent Delay Equations, Applied Mathematics and Application of Mathematics, Nice, France, 2003. február 10-13. (in invited section)
43. Numerical Approximation of Neutral Differential Equations on Infinite Interval, Colloquium on Differential and Difference Equations, Brno, Csehország, 2002. szeptember 3-6.
44. 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.
45. Stability in delay perturbed differential equations, Brno Colloquium on Differential and Difference Equations, Brno, Csehország, 2000. szeptember 5-8. 
46. Parameter identification in functional differential equations with state-dependent delays, The Third World Congress of Nonlinear Analysts, Catania, Olaszország, 2000. július 19-26.
47. Preservation of stability in functional differential equations under delay perturbations, Sixth Colloquium on the Qualitative Theory of Differential Equations, Szeged, 1999. augusztus.
48. Parameter identification in functional differential equations, Borůvka Mathematical Symposium, Brno-Valtice, Csehország, 1999 május. 
49. 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. 
50. Parameter identification in functional differential equations with state-dependent delays, Functional Differential-Difference Equations and Applications, Antalya, Törökország, 1997. augusztus.
51. Fifth Colloquium on the Qualitative Theory of Differential Equations, Szeged, 1996. július.
52. Conference on Dynamical Systems in Biology and Medicine, Veszprém, 1996. július.
53. International Conference on Dynamical Systems & Differential Equations, Springfield, Missouri, USA, 1996. május.
54. 15th  Regional Conference on Differential Equations, Raleigh, North Carolina, USA, 1995. október.
55. On classes of differential equations with state-dependent delays,14th Southeastern Atlantic Regional Conference on Differential Equations, Knoxville, Tennessee, USA, 1994. október.
56. Differentiability with respect to parameters in functional differential equations with state-dependent delays, 23rd Midwest Differential Equations Conference, Norman, Oklahoma, USA, 1994. október.
57. 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.
58. Stability in delay equations with perturbed time lags, 32nd IEEE Conference on Decision and Control, San Antonio, Texas, USA, 1993. december.

Seminars, workshops:

1. On Numerical Approximation of a Delay Differential Equation with Impulsive Self-Support Condition, Drakhlin's Seminar on Functional Differential Equations, December 12, 2022, Ariel University, Ariel, Israel (online)
2. Differentiability of Solutions with respect to Parameters in a Class of Neutral Differential Equations with State-Dependent Delays, University of Szeged, Hungary, Kerékjártó Seminar, November 19, 2020.
3. Differentiability of Solutions with respect to Parameters in a Class of Neutral Differential Equations with State-Dependent Delays, ELTE Matematikai Intézet, 2019. november 11.
4. On parameter estimation in functional differential equations, Veszprém Optimization Workshop, August 26–27, 2019, Veszprém, Hungary
5. 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
6. 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
7. 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.
8. Állapotfüggő késleltetésű funkcionál-differenciálegyenletek megoldásainak differenciál-hatósága paraméterek szerint (in Hungarian), ELTE, Alkalmazott Analízis és Számításmatematikai Tanszék Szemináriuma, 2010. november 15.
9. On differentiability of solutions with respect to parameters in functional differential equations with state-dependent delays, Virginia Polytechnic Institute & State University, Blacksburg, VA, USA, 2010. április 29.
10. On differentiability of solutions with respect to parameters in functional differential equations with state-dependent delays, University of Memphis, TN, USA, 2010. április 27.
11. On smooth dependence on parameters in functional differential equations with state-dependent delays, University of Texas-Pan American, Edinburg, TX, USA, 2010. április 10.
12. Asymptotically exponential solutions in nonlinear integral, differential and difference equations, University of Texas at Dallas, Richardson, TX, USA, 2010. március 2.
13. Állapotfüggő késleltetésű differenciálegyenletek (in Hungarian), MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Veszprém, 2009. szeptember 30.
14. Állapotfüggő késleltetésű differenciálegyenletek (in Hungarian), Differenciálegyenletek, Tudományos ülés, MTA Székháza, 2009. május 27.
15. Parameter estimation in functional differential equations with state-dependent delays, MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Győr, 2009. május 22.
16. Neutrális állapotfüggő késleltetésű differenciálegyenletek (in Hungarian), MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Győr, 2007. október 5.
17. Matematika oktatás a Pannon Egyetemen (in Hungarian), Matematika oktatás mérnök és műszaki informatikai képzésekben, Ráckeve, 2007. március 2-4.
18. Linearized stability for neutral differential equations with state-dependent delays, Department of Mathematical Analysis, University of Santiago, Stantiago de Compostela, Spain, 2006. november 2.
19. On stability in functional differential equations with state-dependent delays, Department of Applied Mathematics II, University of Vigo, Vigo, Spain, 2006. október 31. 
20. On stability of delay systems using perturbation methods, Departmento de Matemática Aplicada, Uiversidad Nacional de Educación a Distancia (UNED), Madrid, Spain, 2006. október 30.
21. Linearizált stabilitás állapotfüggő késleltetésű egyenletekre (in Hungarian), MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Veszprém, 2006. október 11.
22. 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.
23. Állapotfüggő késleltetésű neutrális differenciálegyenletek megoldásainak paraméter szerinti differenciálhatósága (in Hungarian), MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Veszprém, 2005. május 31.
24. Állapotfüggő késleltetésű neutrális egyenletekről (in Hungarian), JATE Bolyai Intézet Differenciálegyenletek Szemináriuma, 2005. február 10.
25. On stability of linear delay seytems using perturbation methods, University of Texas at Dallas, Richardson, TX, USA, 2004. június 29.
26. Fundamental solutions and asymptotic stability of linear delay equations, MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Veszprém, 2004. május 17.
27. Semi-discretization of functional differential equations modeling milling processes, MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Veszprém, 2004. május 17.
28. Matematika programcsomagok oktatása (in Hungarian), Informatika és kommunikáció az oktatásban, Szombathely, 2001. március 29-31.
29. Állapotfüggő késleltetésű funkcionál-differenciálegyenletek megoldásainak paraméter szerinti differenciálhatóságáról (in Hungarian), BME Differenciálegyenletek Tanszékének Szemináriuma, 2000. december 7.
30. Késleltetésben perturbált funkcionál-differenciálegyenletek stabilitásáról (in Hungarian), MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Veszprém, 1999. október 25.
31. Paraméter becslés funkcionál-differenciálegyenletekre (in Hungarian), MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Győr, 1998. június 17. 
32. Állapotfüggő késleltetésű neutrális differenciálegyenletek egy osztályáról (in Hungarian), MTA VEAB, Matematikai analízis és alkalmazásai munkabizottság ülése, Veszprém, 1997. június 19. 
33. Állapotfüggő késleltetésű retardált differenciálegyenletek megoldásainak paraméter szerinti differenciálhatóságáról (in Hungarian), JATE Bolyai Intézet Differenciálegyenletek Szemináriuma, 1997. március 13.
34. On classes of functional differential equations with state-dependent delays, Center for Applied Mathematics, Virginia Polytechnic Institute & State University, Blacksburg, Virginia, 1995. március.

Teaching Experience:

• Szent-Györgyi A. Medical University, Szeged, 1986-1991 (calculus for chemists, introduction to computer science)
• József A. University, Szeged, 1987-1989 (calculus, geometry, probability)
• University of Texas at Dallas, Richardson, TX, USA, 1991-1995 (calculus of several variables, precalculus, ordinary differential equations, numerical analysis, mathematics for non-majors, complex variables)
• Virginia Polytechnic Institute & State University, Blacksburg, Virginia, USA 1995-1996 (business calculus, calculus I-II, ordinary differential equations)
• University of Pannonia (called earlier as University of Veszprém), 1996- (calculus II-IV, differential equations, numerical analysis, abstract algebra and mathematical logic, discrete mathematics, mathematical software packages)

Awards, assistantships:

• Teaching Assistantship, University of Texas at Dallas, 1991-1994. 
• Selden Leavell Endowed Scholarship, University of Texas at Dallas, 
• Amelia Lundell Textbook Scholarship, University of Texas at Dallas,
• Research fellowship, Virginia Polytechnic Institute and State University, 1996 június. 
• János Bolyai Research Grant of the Hungarian Academy of Sciences, 1998-2001.
• Cross Merit of the Hungarian Republic, 2008
• Sebestyén Attila Medallion, 2015 (University of Pannonia).
• Honorary Member of the Hungarian Chamber of Engineers, 2019. 
• Officer's Crosses of the Order of Merit of the Republic of Hungary, 2020.
• Pro Facultate (Faculty of Information Technology, University of Pannonia), 2023
• Pro Universitate Pannonica gold medal (University of Pannonia), 2024
  

Research Grants:

• AMFK No. 249/96, Applied mathematics, 500000 HUF, 1997, principal investigator: I. Győri, investigators: F. Hartung, Cs. Mihálykó
• Hungarian Ministry of Education, FKFP No. 1024/1997, Qualitative and quantitative properties of delay difference and differential equations, 2000000 HUF, 1997-2000, principal investigator: I. Győri, investigators: F. Hartung, M. Pituk
• Hungarian National Foundation for Scientific Research Grant (OTKA) No. T031935, Qualitative and quantitative theory of delay difference and differential equations with applications in population dynamics, 3880000 HUF, 2000-2003, principal investigator: I. Győri, investigators: F. Hartung, L. Horváth, M. Pituk, B. Slezák
  
• Hungarian Ministry of Education,  Foundation Mecenatúra (No. OMFB-00964/2003), support conference organization, 300000 HUF, M. Pituk, F. Hartung
  
• Hungarian National Foundation for Scientific Research Grant (OTKA) No. T046929, Qualitative and quantitative theory of delay difference and differential equations with applications, 11493000 HUF, 2004-2007, principal investigator: I. Győri, investigators: F. Hartung, L. Horváth, R. Horváth-Bokor, M. Pituk, B. Slezák
• Bilateral Science and Technology Cooperation Programme: Hungary-Spain,  984000 HUF  2005-2006, principal investigator: M. Pituk, investigators: I. Győri, F. Hartung, T. Krisztin, G. Röst
• Hungarian National Foundation for Scientific Research Grant (OTKA) No. K73274, 16000000 HUF, 2008-2012, principal investigator: I. Győri, investigators: F. Hartung, L. Horváth, M. Pituk, B. Slezák 
• Bilateral Science and Technology Cooperation Programme: Hungary-Spain,  41000000 HUF  2009-2010, principal investigator: T. Krisztin, investigators: I. Győri, F. Hartung, M. Pituk, G. Röst, G. Vas, F. A. Bartha
• Hungarian National Foundation for Scientific Research Grant (OTKA) No. K101217, 16000000 HUF, 2012-2016, principal investigator: I. Győri, investigators: F. Hartung, L. Horváth, M. Pituk
• Hungarian National Foundation for Scientific Research Grant (OTKA) No. K120186, 19700000 HUF, 2016-2020, principal investigator Hartung Ferenc, investigators: Győri István, Horváth László, Pituk Mihály
• Hungarian National Foundation for Scientific Research Grant No. KH 130513, 10572000 HUF, 2018-2020, principal investigator Pituk Mihály, investigators: Győri István, Hartung Ferenc, Horváth László
• Hungarian National Foundation for Scientific Research Grant (OTKA) No. K139346, 9875000 HUF, 2021-2025, principal investigator Pituk Mihály, investigators: Hartung Ferenc, Horváth László,

Editorial Board Memberships

• Managing Editor of the International Journal of Qualitative Theory of Differential Equations and Applications, Serials Publications, India, (2006-2016).
• Member of the Editorial Board of Journal of Applied Mathematics, Hindawi Publishing Corporation (2011-). 
• Member of the Editorial Board of Abstract and Applied Analysis, Hindawi Publishing Corporation (2012-2019). 
• Member of the Editorial Board of Electronic Journal of Qualitative Theory of Differential Equations, Bolyai Institute, University of Szeged (2015-). 
• Az Alkalmazott Matematikai Lapok szerkesztő bizottságának tagja (2017-). 
• Member of the Editorial Board of Functional Differential Equations, Ariel University Press (2018-). 
• Member of the Editorial Board of Mathematica, MDPI (2020-2022). 
• Mathematica Pannonica, Akadémiai Kiadó, főszerkesztő-helyettese (2021-).

Other professional activities:

• Mathematical Analysis Working Group of the Regional Centre of the Hungarian Academy of Sciences, Veszprém. member (1996-), secretary (2006-2009), chairman (2017-)
• Referee for scientific journals (Abstract and Applied Analysis, Acta Mathematica Universitatis Comenianae, Acta Scientiarum Mathematicarum, Advances in Difference Equations, AIMS Proceedings, Annales Polonici Mathematici, Applied Mathematics and Computation, Applied Mathematics Letters, Applied Mathematical Modelling, Arabian Journal for Science and Engineering, Automatica, Central European Journal of Mathematics, Communications in Nonlinear Science and Numerical Simulation , Communications on Pure and Applied Analysis, Comput. Math. Appl., Computing, Czechoslovak Mathematical Journal, Differential Equations and Dynamical Systems, Discrete and Continuous Dynamical Systems, Series A, Discrete and Continuous Dynamical Systems, Series B, Discrete and Continuous Dynamical Systems, Series S, Discrete Dynamics in Nature and Society, Electronic Journal of Differential Equations, Electronic Journal of Qualitative Theory of Differential Equations, Electronic Transaction on Numerical Analysis, FILOMAT, Funkcialaj Ekvacioj, Functional Differential Equations, Graduate Journal of Mathematics, IEEE Transaction on Automatic Control, IEEE Transaction on Neural Networks, Indian J. Pure Appl. Math., International Journal of Bifurcation and Chaos, Int. J. Math. and Math. Sci., Int. J. Qualitative Theory of Differential Equations with Applications, Journal for Analysis and Applications, Journal of Differential Equations, J. Dynamics and Differential Equations, Journal of Fixed Point Theory and Applications, Journal of Inequalities and Applications, J. Integral Equations and Applications, J. Math. Anal. Appl., Math. Comp. Mediterranean Journal of Mathematics, Modelling, Math. Methods in the Applied Sciences, Matematicki Vesnik, Miskolc Mathematical Notes, Nonlin. Anal. TMA, Nonlinear Analysis Series B: Real World Applications, Nonlinear Differential Equations and Applications, Nonlinear Dynamics, Numerische Mathematik, Periodica Mathematica Hungarica, Proc. Edinburgh Math. Soc., Physics Letters A, Publicationes Mathematicae, Sarajevo Journal of Mathematics, SIAM J. Control and Opt., SIAM J. Math. Anal., Zeitschrift fuer Angewandte Mathematik und Physik).
• Reviewer of PhD dissertations (University of Szeged, Hungary, 2002, 2006, 2007, 2014, 2019, 2021; Budapest University of Technology, Hungary, 2005; University of Alexandria, Egyipt, 2006, 2007; Bengal Engineering and Science University, India, 2009; Dublin City University, Ireland, 2011; University of Pannonia, Hungary 2014, 2018, 2023; Eötvös Loránd University, Hungary, 2024).
• Co-chairman (with M. Pituk) of the local organizing committee of the International Conference on Delay Differential and Difference Equations with Applications, Veszprém, August 25-29, 2003.
• Guest Editor (with M. Pituk) of the Special Issue of Functional Differential Equations, vol 11, no. 1-2, 2004.
• Co-organizer (with I. Győri) of the Special Session on Qualitative and quantitative theory of state-dependent functional differential equations with applications at  DSDE 2004, Pomona, USA, June 16 - 19, 2004.
• Co-organizer (with I. Győri and Y. Kuang) of the Special Session on Dynamics of Delay Differential and Difference Equations with Applications at Fourth World Congress of Nonlinear Analysts 2004, Orlando, USA, June 30-July 7, 2004.
  
• Member of the Global Organizing Committee of the Fourth World Congress of Nonlinear Analysts, Orlando, FL, USA, June 30-July 7, 2004.
• Co-organizer (with E. Braverman) of the Special Session on Qualitative Theory of Functional Differential Equations with Applications, Fifth International Conference on Differential Equations and Dynamical Systems, Edinburg, Texas, USA, December 16-18, 2006.
• Member of the Global Organizing Committee of the Fifth International Conference on Differential Equations and Dynamical Systems, Edinburg, Texas, USA, December 16-18, 2006.
• Co-organizer (with I. Győri) of the Special Session on Theory and applications of delay differential and difference equations at Fifth World Congress of Nonlinear Analysts Orlando, Florida, USA, July 2- July 9, 2008.
• Co-chairman (with M. Pituk) of the local organizing committee of the International Conference on Differential and Difference Equations, Veszprém, July 14-17, 2008.
• Member of the Scientific Committee of “Conference on Functional Differential Equations and Application” (Ariel University Center, Israel, August 29 – September 2, 2010)
• Co-chairman (with M. Pituk) of the local organizing committee of the International Conference on Delay Differential and Difference Equations with Applications, Balatonfüred, July 15-19, 2013.
• Member of the Scientific Committee, “1st WSEAS International Conference on PURE MATHEMATICS (PUMA '14)” (Tenerife, Spain, January 10-12, 2014)
• Chair of the Local Organizing committee of “International Conference Geometry and Symmetry”, 29 June - 3 July 2015, Veszprém, Hungary
• Editor of the Special Issue of the Electronic Journal of Qualitative Theory of Differential Equations (with E. Liz, G. Röst. H.-O. Walther és J. R. L. Webb), 2016.
• President of the Mathematical Analysis and its Applications Working Committee of the Veszprém Section of the Hungarian Academy of Sciences (2017-)
• 14th IFAC Workshop on Time Delay Systems, June 28-30, 2018, Budapest, Hungary, member of the International Program Committee 
• Veszprém Discrete Mathematics and Applications Conference, 25 June - 29 June 2018, Veszprém, Hungary member of the organizing committee 
• Veszprém Conference on Differential and Difference Equations and Applications, 2-5 July 2018, Veszprém, Hungary, co-chair of the organizing committee (with M. Pituk)
• Veszprém Optimization Workshop, August 26 - 27, 2019, Veszprém, Hungary, member of the Local Organizing Committee
• Pannonian Conference on Advances in Information Technology, 30 May - 1 June 2019, Veszprém, Hungary, member of the Scientific Committee
• University of Szeged, Mathematics Doctoral School (discipline) Habilitation committee external member (2016-)
• University of Szeged, Informatics Doctoral School (discipline) Habilitation committee external member (2019-)
• Óbuda University Doctoral Council of the University external member (2022-)
  

PhD student supervised:

• Essam Awwad (2013), co-supervisor: István Győri
• István Szalkai (2014), co-supervisor: Zsolt Tuza
• Nahed A. Mohamady (2017), co-supervisor: Győri István

Managerial assignments:

• Vice-dean responsible for educational affairs of Faculty of Teacher Training, University of Veszprém, Hungary, July 2000 - June 2002. 
• Vice-dean responsible for educational affairs of Faculty of Information Technology, University of Pannonia, Hungary, January 2006 - January 2016 
• Dean of the Faculty of Information Technology, University of Pannonia, Hungary, February 2016 - February 2022.
• Head of Department of Information Systems, Uiversity of Pannonia, Veszprém, Hungary, September 2008 - December 2008.
• Head of Department of Mathematics, University of Pannonia, Veszprem, Hungary, July 2009 - June 2010.
• Head of Undergraduate Program in Programming Mathematics, University of Pannonia, Veszprem, Hungary, 2003-2016.
• Head of MSc Program in Computer Science, University of Pannonia, Veszprem, Hungary, 2019 -
• Head of BSc Program in Software Information Technology, University of Pannonia, Veszprem, Hungary, 2006-2016.
• Head of Department of Mathematics, University of Pannonia, Veszprem, Hungary, July 2013 - 
• Head of the Doctoral School of of Information Science and Technology, University of Pannonia, 2022 -

Personal: