Publications, Conferences & Workshops 

Research

My research focuses on classification on multivariate functional data, uncertainty quantification  for classification for functional data, deep learning, nonlinear operator theory and applications, and functional analysis.

Publications

1. U. V. Nnyaba, H. M. Shemtaga, D. W. Collins, A. L. Muyskens, B. W. Priest and N. Billor:  Enhancing electrocardiography data classification confidence: a robust Gaussian process approach (MuyGPs). arXiv PDF (Submitted)

2. U. V. Nnyaba and O.M. Romanus: New algorithms for solving system of generalized mixed equilibrium problems and some nonlinear problems, with applications. Optimization. 

3.  C.E. Chidume, O.M. Romanus, U.V. Nnyaba: An iterative algorithm for solving split equality fixed point problems for a class of nonexpansive-type mappings in Banach spaces. Numerical Algorithms 

4. C.E. Chidume, A. Adamu, M.S Minjibir, U.V Nnyaba: On the strong convergence of the proximal point algorithm with an application to Hammerstein equations. Journal of Fixed Point Theory and Applications 22 (3), 61, 2020. 

5. C.E. Chidume, O.M. Romanus, U.V. Nnyaba: An iterative algorithm for solving split equilibrium problems and split equality variational inclusions for a class of nonexpansive-type maps. Optimization 

6. C.E. Chidume, U.V. Nnyaba, O.M. Romanus, C.G. Ezea: Convergence theorems for strictly J- pseudocontractions with application to zeros of Gamma-inverse strongly monotone maps. Panam. Math. J. 26 (4), 57-76. 2016 

7. C.E. Chidume, O.M. Romanus, U.V. Nnyaba: A new iterative algorithm for zeros of generalized Phi- strongly monotone and bounded maps with application: Br. J. Math. Comput. Sci 18 (1), 1-14. 2016 

8. C.E. Chidume, G.S De Souza, U.V. Nnyaba, O.M. Romanus, A. Adamu: Approximation of zeros of m-accretive mappings, with applications to Hammerstein integral equations. Carpathian Journal of Mathematics 36 (1), 59-69. 2020 

9. C.E. Chidume, U.V. Nnyaba, O.M. Romanus: A new algorithm for variational inequality problems with a generalized phi-strongly monotone map over the set of common fixed points of a finite family of quasi-phi- nonexpansive maps, with applications. Journal of Fixed Point Theory and Applications 20, 1-15. 2018 

10. C.E. Chidume, O.M. Romanus, U.V. Nnyaba: Relaxed iterative algorithms for a system of generalized mixed equilibrium problems and a countable family of totally quasi-Phi-asymptotically nonexpansive multi-valued maps. Fixed Point Theory and Applications 2017, 1-15. 2017.

11. C.E. Chidume, G.S. De Souza, O.M. Romanus, U.V. Nnyaba: A strong convergence theorem for maximal monotone operators in Banach spaces with applications. Carpathian Journal of Mathematics 36 (2), 229- 240. 2020. 

12. O.M. Romanus, U.V. Nnyaba, M.O. Nnakwe: Algorithms for a system of generalized mixed equilibrium problems and a countable family of some nonlinear multi-valued nonexpansive-type maps. Acta Mathematica Scientia 38 (6), 1805-1820. 2018.

13. O.M. Romanus, M.O. Nnakwe, U.V. Nnyaba: A Krasnoselskii-type algorithm for approximating zeros of monotone maps in Banach spaces with applications. J.Nonlinear Var. Anal 2, 305-315. 2018 .

14. C.E. Chidume, U.V. Nnyaba, O.M. Romanus: Some iterative algorithms for approximating solutions of nonlinear operator equations in Banach spaces. Journal of Fixed Point Theory and Applications 21 (2), 68. 2019 

15. O.M. Romanus, U.V. Nnyaba, M.O. Nnakwe. Algorithms for approximating solutions of equilibrium problems and fixed points of nonexpansive-type semigroup. Fixed Point Theory 21 (2), 727-738. 2020.

16. M.S. Minjibir, O.O. Osisiogu, U.V. Nnyaba: An iterative algorithm for approximating solutions of variational inequality and fixed point problems in Banach spaces. Journal of Nigerian Mathematical Society 38 (3), 391-408. 2019 

17. O.M. Romanus, U.V. Nnyaba, B.C. Ifebude: Strong convergence theorems of an inertial algorithm for approximating common fixed points of a family of multi-valued pseudocontractive-type maps. Adv. Fixed Point Theory 8 (4), 401-424. 2018.

Conferences

1. 2024 Joint Statistical Meeting (JSM), Portland Oregon (3 - 8 August 2024)

• Invited talk:  Optimal Classification of Multivariate Functional Data using Deep Neural Networks 

2. 38th Annual Conference of the Nigerian Mathematical Society (NMS) , University of Nigeria, Nsukka, Nigeria (18 - 21 June 2019)

• Invited talk: Approximation of zeros of m-accretive mappings with applications to Hammerstein integral equations.

3. 37th Annual Conference of the Nigerian Mathematical Society (NMS), Bayero University Kano, Kano, Nigeria (8 - 11 May 2018)

• Invited talk: A new inertial forward-backward algorithm and a strong convergence theorem for approximating solutions of monotone inclusions. 

4. 2018 Southern African Mathematical Science Association (SAMSA) conference Botswana International University of Science and Technology (BIUST), Palapye, Botswana, 19 - 22 November 2018

• Invited talk: Halpern-type iterative algorithms for generalized split feasibility problems in real Banach spaces 

Workshops

1. Participant at the Masamu Advanced Study Institute (MASI) Workshop, Palapye, Botswana, 

2. Participant, Southern African Mathematical Science Association (SAMSA) conference and MASI workshop, Arusha, Tanzania

3. Participant, Pan African School of Materials (PASMAT) Workshop on Energy

4. Participant, AMRS - AUST Innovation and Industrial day