B.Sc. in Computer Science at University São Francisco, M.Sc. and D.Sc. in Computer Science in the Institute of Mathematics and Statistics at University of Sao Paulo.

Currently, I am an assistant professor in Faculty UnB Gama at University of Brasília. My main research interests are computational methods of optimization and algorithms.

## Publications

E. G. Birgin,
J. L. Gardenghi, D. S. Marcondes, J. M. Martínez. Accelerated
derivative-free spectral residual method for nonlinear systems of
equations, *submitted*. [PDF] [Code]

E. G. Birgin, J. L. Gardenghi, A. Laurain. Asymptotic bounds on the
optimal radius when covering a set with minimum radius identical
balls, *Mathematics of Operations Research*, *to appear*.
[PDF] [Code] [Tables]

E. G. Birgin, J. L. Gardenghi, J. M. Martínez, S. A. Santos. On the
solution of linearly constrained optimization problems by means of
barrier algorithms. *TOP*, 2021. [PDF] [Code] [SharedIt]

J. L. Gardenghi, L. G. Pereira,
S. M. Alcantara, R. M. C. Figueiredo, C. S. Ramos. Digitalization by
Means of a Prototyping Process: The Case of a Brazilian Public
Service. *Information*, 2020. [PDF]

E. G. Birgin, J. L. Gardenghi, J. M. Martínez, S. A. Santos. On the
use of third-order models with fourth-order regularization for
unconstrained optimization. *Optimization Letters*, 2019. [PDF] [Code]
[SharedIt]

E. G. Birgin, J. L. Gardenghi,
J. M. Martínez, S. A. Santos, Ph. L. Toint. Worst-case evaluation
complexity for unconstrained nonlinear optimization using high-order
regularized models. *Mathematical Programming*, 2017. [PDF] [SharedIt]

E. G. Birgin, J. L. Gardenghi,
J. M. Martínez, S. A. Santos, Ph. L. Toint. Evaluation complexity for
nonlinear constrained optimization using unscaled KKT conditions and
high-order models. *SIAM Journal on Optimization*, 2016. [PDF]

J. L. Gardenghi, S. A. Santos. Métodos de regiões de confiança para
resolução do problema de quadrados mínimos: implementação e testes
numéricos. *Trends in Applied and Computational Mathematics*, 2013.
[PDF]

## Other publications

### Chapters

R. M. C. Figueiredo, L. S. Melo, J. L. Gardenghi,
R. A. D. Kosloski. Tecnologias disruptivas no contexto da
transformação digital. *Editora Atenas*, 2020. [PDF]

### Conferences

L. Santos,
R. M. C. Figueiredo, R. Barbosa, A. Vincenzi, G. V. Pedrosa, and
J. L. Gardenghi. Towards an Approach for Improving Exploratory Testing
Tour Assignment based on Testers’ Profile. *Proceedings of the 24th
International Conference on Enterprise Information Systems - Volume 2:
ICEIS*, 2022.

R. M. C. Figueiredo, J. L. Gardenghi, L. Santos, R. Furtado,
R. Barbosa, L. Boaventura, A. Modesto, and L. Martins. The Design of a
Public Service Cost Model Tool to Evaluate Digital Transformation in
Brazilian Government. *Proceedings of the 24th International
Conference on Enterprise Information Systems - Volume 2: ICEIS*,
2022.

J. L. Gardenghi,
M. A. G. Bardi. An Authentication Middleware for Squid Proxy-Cache: a
Single Sign-on Approach. *12th International Conference on
Computational Science and Its Applications*, 2012. [PDF]