Publications

Journals

1. Asymptotic and Mittag–Leffler Synchronization of Fractional-Order Octonion-Valued Neural Networks with Neutral-Type and Mixed Delays. Fractal and Fractional. November 2023.

2. Neutral-type, leakage, and mixed delays in fractional-order neural networks: asymptotic synchronization analysis. AIMS Mathematics. May 2023.

3. Mittag–Leffler stability and synchronization of neutral-type fractional-order neural networks with leakage delay and mixed delays. Journal of the Franklin Institute. November 2022.

4. Neutral-type and mixed delays in fractional-order neural networks: Asymptotic stability analysis. Fractal and Fractional. December 2022.

5. Novel Reinforcement Learning Research Platform for Role-Playing Games. Mathematics. November 2022. (MDPI, ISI Impact factor 2.258, Q1)

6. C.-A. Popa and E. Kaslik. Finite-Time Mittag–Leffler Synchronization of Neutral-Type Fractional-Order Neural Networks with Leakage Delay and Time-Varying Delays. Mathematics. July 2020. (MDPI, ISI Impact factor 2.258, Q1)

7. C.-A. Popa. Dissipativity of impulsive matrix-valued neural networks with leakage delay and mixed delays. Neurocomputing. March 2020. (ScienceDirect, ISI Impact factor 5.719, Q1)

8. C.-A. Popa. Global μ-Stability of Neutral-Type Impulsive Complex-Valued BAM Neural Networks with Leakage Delay and Unbounded Time-Varying Delays. Neurocomputing. September 2019. (ScienceDirect, ISI Impact factor 5.719, Q1)

9. C.-A. Popa. Global Exponential Stability of Octonion-Valued Neural Networks with Leakage Delay and Mixed Delays. Neural Networks. June 2018. (ScienceDirect, ISI Impact factor 8.050, Q1)

10. C.-A. Popa. Global Exponential Stability of Neutral-Type Octonion-Valued Neural Networks with Time-Varying Delays. Neurocomputing. May 2018. (ScienceDirect, ISI Impact factor 5.719, Q1)

11. C.-A. Popa and E. Kaslik. Multistability and multiperiodicity in impulsive hybrid quaternion-valued neural networks with mixed delays. Neural Networks. December 2017. (ScienceDirect, ISI Impact factor 8.050, Q1)

12. C.-A. Popa. Learning Algorithms for Quaternion-Valued Neural Networks. Neural Processing Letters. September 2017. (SpringerLink, ISI Impact factor 2.908, Q2)

13. P. Birtea, D. Comănescu, and C.-A. Popa. Averaging on Manifolds by Embedding Algorithm. Journal of Mathematical Imaging and Vision, 49(2):454 - 466, June 2014. (SpringerLink, ISI Impact factor 1.627, Q2)

Conferences

1. A.I. Călin, C.-A. Popa, C. Moldovan, A. Davidescu. Model-Free Reaching of a 2-DOF Robotic Arm Using Neural Networks. International Symposium on Science of Mechanisms and Machines (SYROM). November 2022, Iaşi, Romania. (SpringerLink) 

2. C.-A. Popa. Deep Hybrid Real-Complex-Valued Convolutional Neural Networks for Image Classification. International Joint Conference on Neural Networks (IJCNN). July 2018, Rio de Janeiro, Brazil, Brazil. (IEEE, ISI)

3. C.-A. Popa. Complex-Valued Deep Boltzmann Machines. International Joint Conference on Neural Networks (IJCNN). July 2018, Rio de Janeiro, Brazil, Brazil. (IEEE, ISI)

4. C.-A. Popa. Complex-Valued Stacked Denoising Autoencoders. International Symposium on Neural Networks (ISNN). June 2018, Minsk, Belarus. (SpringerLink, ISI)

5. C.-A. Popa. Complex-Valued Deep Belief Networks. International Symposium on Neural Networks (ISNN). June 2018, Minsk, Belarus. (SpringerLink, ISI)

6. C.-A. Popa and C. Cernăzanu-Glăvan. Fourier Transform-Based Image Classification Using Complex-Valued Convolutional Neural Networks. International Symposium on Neural Networks (ISNN). June 2018, Minsk, Belarus. (SpringerLink, ISI) 

7. C.-A. Popa. Exponential Stability of Matrix-Valued BAM Neural Networks with Time-Varying Delays. International Conference on Neural Information Processing (ICONIP). November 2017, Guangzhou, China. (SpringerLink, ISI)

8. C.-A. Popa. Asymptotic Stability of Delayed Octonion-Valued Neural Networks with Leakage Delay. International Conference on Neural Information Processing (ICONIP). November 2017, Guangzhou, China. (SpringerLink, ISI)

9. C.-A. Popa. Global Exponential Stability for Matrix-Valued Neural Networks with Time Delay. International Symposium on Neural Networks (ISNN). June 2017, Sapporo, Hokkaido, Japan. (SpringerLink, ISI)

10. C.-A. Popa. Global Asymptotic Stability for Octonion-Valued Neural Networks with Delay. International Symposium on Neural Networks (ISNN). June 2017, Sapporo, Hokkaido, Japan. (SpringerLink, ISI)

11. C.-A. Popa. Quasi-Newton Learning Methods for Quaternion-Valued Neural Networks. International Work-Conference on Artificial Neural Networks (IWANN). June 2017, Cadiz, Spain. (SpringerLink, ISI)

12. C.-A. Popa. Exponential Stability for Delayed Octonion-Valued Recurrent Neural Networks. International Work-Conference on Artificial Neural Networks (IWANN). June 2017, Cadiz, Spain. (SpringerLink, ISI)

13. C.-A. Popa. Octonion-Valued Bidirectional Associative Memories. International Joint Conference on Neural Networks (IJCNN). May 2017, Anchorage, Alaska, USA. (IEEE, ISI)

14. C.-A. Popa. Complex-Valued Convolutional Neural Networks for Real-Valued Image Classification. International Joint Conference on Neural Networks (IJCNN). May 2017, Anchorage, Alaska, USA. (IEEE, ISI)

15. C.-A. Popa. Global Asymptotic Stability for Matrix-Valued Recurrent Neural Networks with Time Delays. International Joint Conference on Neural Networks (IJCNN). May 2017, Anchorage, Alaska, USA. (IEEE, ISI)

16. C.-A. Popa. Scaled Conjugate Gradient Learning for Quaternion-Valued Neural Networks. International Conference on Neural Information Processing (ICONIP). October 2016, Kyoto, Japan. (SpringerLink, ISI)

17. C.-A. Popa. Levenberg-Marquardt Learning Algorithm for Quaternion-Valued Neural Networks. International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC). September 2016, Timişoara, Romania. (IEEE, ISI)

18. C.-A. Popa. Octonion-Valued Neural Networks. International Conference on Artificial Neural Networks (ICANN). September 2016, Barcelona, Spain. (SpringerLink, ISI)

19. C.-A. Popa. Matrix-Valued Bidirectional Associative Memories. International Workshop on Soft Computing Applications (SOFA). August 2016, Arad, Romania. (SpringerLink, ISI)

20. C.-A. Popa. Enhanced Gradient Descent Algorithms for Quaternion-Valued Neural Networks. International Workshop on Soft Computing Applications (SOFA). August 2016, Arad, Romania. (SpringerLink, ISI)

21. C.-A. Popa. Matrix-Valued Hopfield Neural Networks. International Symposium on Neural Networks (ISNN). July 2016, Saint Petersburg, Russia. (SpringerLink, ISI)

22. C.-A. Popa. Lie Algebra-Valued Bidirectional Associative Memories. International Conference on Soft Computing (MENDEL). June 2016, Brno, Czech Republic. (SpringerLink)

23. C.-A. Popa. Conjugate Gradient Algorithms for Quaternion-Valued Neural Networks. International Conference on Soft Computing (MENDEL). June 2016, Brno, Czech Republic. (SpringerLink)

24. C.-A. Popa. Conjugate Gradient Algorithms for Complex-Valued Neural Networks. International Conference on Neural Information Processing (ICONIP). November 2015, Istanbul, Turkey. (SpringerLink, ISI)

25. C.-A. Popa. Lie Algebra-Valued Hopfield Neural Networks. International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC). September 2015, Timişoara, Romania. (IEEE, ISI)

26. C.-A. Popa. Quasi-Newton Learning Methods for Complex-Valued Neural Networks. International Joint Conference on Neural Networks (IJCNN). July 2015, Killarney, Ireland. (IEEE, ISI)

27. C.-A. Popa. Lie Algebra-Valued Neural Networks. International Joint Conference on Neural Networks (IJCNN). July 2015, Killarney, Ireland. (IEEE, ISI)

28. C.-A. Popa. Scaled Conjugate Gradient Learning for Complex-Valued Neural Networks. International Conference on Soft Computing (MENDEL). June 2015, Brno, Czech Republic. (SpringerLink, ISI)

29. C.-A. Popa. Matrix-Valued Neural Networks. International Conference on Soft Computing (MENDEL). June 2015, Brno, Czech Republic. (SpringerLink, ISI)

30. C.-A. Popa. Enhanced Gradient Descent Algorithms for Complex-Valued Neural Networks. International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC). September 2014, Timişoara, Romania. (IEEE, ISI)

31. C.-A. Popa. Exact Hessian Matrix Calculation for Complex-Valued Neural Networks. International Workshop on Soft Computing Applications (SOFA). July 2014, Timişoara, Romania. (SpringerLink, ISI)

32. C.-A. Popa and C. Cernăzanu-Glăvan. Pattern Neural Networks: A Case Study. Workshop on Software Services: Cloud Computing and Applications. June 2011, Timişoara, Romania. (Google Scholar)

Reviewer

• 1. IEEE Signal Processing Magazine (IEEE, ISI Impact factor 14.9, Q1)

  2. Artificial Intelligence (ScienceDirect, ISI Impact factor 14.4, Q1)

  3. IEEE Transactions on Cybernetics (IEEE, ISI Impact factor 11.8, Q1)

  4. IEEE Transactions on Neural Networks and Learning Systems (IEEE, ISI Impact factor 10.4, Q1)

  5. Automation in Construction (ScienceDirect, ISI Impact factor 10.3, Q1)

  6. Knowledge-Based Systems (ScienceDirect, ISI Impact factor 8.8, Q1)

  7. IEEE Transactions on Systems, Man, and Cybernetics: Systems (IEEE, ISI Impact factor 8.7, Q1)

  8. Expert Systems with Applications (ScienceDirect, ISI Impact factor 8.5, Q1)

  9. Information Sciences (ScienceDirect, ISI Impact factor 8.1, Q1)

  10. Engineering Applications of Artificial Intelligence (ScienceDirect, ISI Impact factor 8, Q1)

  11. Chaos, Solitons & Fractals (ScienceDirect, ISI Impact factor 7.8, Q1)

  12. Neural Networks (ScienceDirect, ISI Impact factor 7.8, Q1)

  13. Alexandria Engineering Journal (ScienceDirect, ISI Impact factor 6.8, Q1)

  14. IEEE Transactions on Network Science and Engineering (IEEE, ISI Impact factor 6.6, Q1)

  15. Computer Methods and Programs in Biomedicine (ScienceDirect, ISI Impact factor 6.1, Q1)

  16. Neurocomputing (ScienceDirect, ISI Impact factor 6, Q2)

  17. International Journal of Machine Learning and Cybernetics (SpringerLink, ISI Impact factor 5.6, Q2)

  18. Nonlinear Dynamics (SpringerLink, ISI Impact factor 5.6, Q1)

  19. Fractal and Fractional (MDPI, ISI Impact factor 5.4, Q1)

  20. International Journal of Electrical Power and Energy Systems (ScienceDirect, ISI Impact factor 5.2, Q1)

  21. IEEE Transactions on Circuits and Systems I: Regular Papers (IEEE, ISI Impact factor 5.1, Q1)

  22. Applied Mathematical Modelling (ScienceDirect, ISI Impact factor 5, Q1)

  23. Image and Vision Computing (ScienceDirect, ISI Impact factor 4.7, Q1)

  24. IEEE Transactions on Biomedical Engineering (IEEE, ISI Impact factor 4.6, Q2)

  25. Mathematics and Computers in Simulation (ScienceDirect, ISI Impact factor 4.6, Q1)

  26. IEEE Transactions on Circuits and Systems II: Express Briefs (IEEE, ISI Impact factor 4.4, Q2)

  27. International Journal of Systems Science (Taylor & Francis Online, ISI Impact factor 4.3, Q1)

  28. Journal of The Franklin Institute (ScienceDirect, ISI Impact factor 4.1, Q1)

  29. Applied Mathematics and Computation (ScienceDirect, ISI Impact factor 4, Q1)

  30. Fuzzy Sets and Systems (ScienceDirect, ISI Impact factor 3.9, Q1)

  31. IEEE Access (IEEE, ISI Impact factor 3.9, Q2)

  32. Sensors (MDPI, ISI Impact factor 3.9, Q2)

  33. Sustainability (MDPI, ISI Impact factor 3.9, Q2)

  34. Cognitive Neurodynamics (SpringerLink, ISI Impact factor 3.7, Q2)

  35. Diagnostics (MDPI, ISI Impact factor 3.6, Q2)

  36. International Journal of Control, Automation and Systems (SpringerLink, ISI Impact factor 3.2, Q2)

  37. Computational Intelligence and Neuroscience (Hindawi, ISI Impact factor 3.12, Q2)

  38. International Journal of Adaptive Control and Signal Processing (Wiley Online Library, ISI Impact factor 3.1, Q2)

  39. Neural Processing Letters (SpringerLink, ISI Impact factor 3.1, Q3)

  40. Arabian Journal for Science and Engineering (SpringerLink, ISI Impact factor 2.9, Q2)

  41. Computers & Mathematics with Applications (ScienceDirect, ISI Impact factor 2.9, Q1)

  42. Mathematical Methods in the Applied Sciences (Wiley Online Library, ISI Impact factor 2.9, Q1)

  43. Metals (MDPI, ISI Impact factor 2.9, Q2)

  44. Neural Computation (MIT Press Journals, ISI Impact factor 2.9, Q3)

  45. Entropy (MDPI,  ISI Impact factor 2.7, Q2)

  46. Symmetry (MDPI, ISI Impact factor 2.7, Q2)

  47. Computational and Applied Mathematics (SpringerLink, ISI Impact factor 2.6, Q1)

  48. Asian Journal of Control (Wiley Online Library, ISI Impact factor 2.4, Q3)

  49. Mathematics (MDPI, ISI Impact factor 2.4, Q1)

  50. Complexity (Hindawi, ISI Impact factor 2.3, Q2)

  51. AIMS Mathematics (AIMS Press, ISI Impact factor 2.2, Q1)

  52. International Journal of Control (Taylor & Francis Online, ISI Impact factor 2.1, Q3)

  53. Journal of Intelligent & Fuzzy Systems (IOS Press, ISI Impact factor 2, Q4)

  54. International Journal of Computer Mathematics (Taylor & Francis Online, ISI Impact factor 1.8, Q2)

  55. Nonlinearity (IOPscience,  ISI Impact factor 1.7, Q2)

  56. Acta Applicandae Mathematicae (SpringerLink, ISI Impact factor 1.6, Q2)

  57. Numerical Functional Analysis and Optimization (Taylor & Francis Online, ISI Impact factor 1.2, Q3)

  58. Journal of Difference Equations and Applications (Taylor & Francis Online, ISI Impact factor 1.1, Q3)

  59. Stat (Wiley Online Library, ISI Impact factor 0.8, Q4)

  60. International Joint Conference on Neural Networks (IJCNN) (IEEE, ISI)

Ph.D. Thesis

• 1. C.-A. Popa. Learning algorithms for Clifford neural networks. Polytechnic University Timisoara. May 2015, Timisoara, Romania.