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Guilherme Ramos received a B.Sc. (2011) and M.Sc. (2013) in Applied Mathematics and Computation and a Ph.D. in information security (2018) from the Instituto Superior Técnico (IST), University of Lisbon, Portugal. From 2018 to 2020, he was a postdoctoral researcher with the Institute for Systems and Robotics at IST (ISR/IST). From 2020 to 2022, Guilherme was a postdoctoral researcher at the Electrical and Computer Engineering Dept. (DEEC), Faculty of Engineering, University of Porto (FEUP). From 2021 to 2022, he was an invited Assistant Professor at the Mathematics Dept., IST. In the second semester of 2022, Guilherme was an invited Assistant Professor at the Computer Science Dept. (DI), Faculty of Sciences, University of Lisbon, Portugal. Currently, he is an Assistant Professor in the tenure track at the Computer Science and Engineering Dept., IST. His areas of interest include structural systems, consensus methods, robust algorithms, cryptography, information theory, ranking, and recommendation Systems.
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Identification

Personal identification

Full name
Guilherme Henrique Caçador Ramos

Citation names

  • Ramos, Guilherme

Author identifiers

Ciência ID
9016-E944-74B5
ORCID iD
0000-0001-6104-8444
Google Scholar ID
d_K2ebUAAAAJ
Researcher Id
AAK-3200-2020
Scopus Author Id
56354034800

Languages

Language Speaking Reading Writing Listening Peer-review
Portuguese (Mother tongue)
English Advanced (C1) Advanced (C1) Advanced (C1) Advanced (C1) Advanced (C1)
French Intermediate (B1) Intermediate (B1) Intermediate (B1) Upper intermediate (B2) Elementary (A2)
Education
Degree Classification
2018
Concluded
 Information Security (Doutoramento)
Major in Sem especialidade
Universidade de Lisboa Instituto Superior Técnico, Portugal
"Improving Information Security in Ranking, Recommender and Control Systems" (THESIS/DISSERTATION)
 Aprovado com distinção
2013
Concluded
 Mathematics and Applications (Mestrado)
Major in Sem especialização
Universidade de Lisboa Instituto Superior Técnico, Portugal
"Structural Hybrid Systems" (THESIS/DISSERTATION)
 18 valores
2008/09/20 - 2011/07/20
Concluded
 Licenciatura em Matemática Aplicada e Computação (Licenciatura)
Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
Affiliation

Science

Category
Host institution 		Employer
2023/03/01 - Current Researcher (Research) Instituto de Telecomunicações, Portugal
2020/03/02 - 2022/03/20 Contracted Researcher (Research) Universidade do Porto Faculdade de Engenharia, Portugal
Universidade do Porto Faculdade de Engenharia, Portugal
2018/07/01 - 2020/02/29 Postdoc (Research) Universidade de Lisboa Instituto de Sistemas e Robótica, Portugal
Universidade de Lisboa Instituto de Sistemas e Robótica, Portugal

Teaching in Higher Education

Category
Host institution 		Employer
2022/09/01 - Current Assistant Professor (University Teacher) Universidade de Lisboa Instituto Superior Técnico, Portugal
2021/10/01 - 2022/02/28 Invited Assistant Professor (University Teacher) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
2021/03/01 - 2021/07/31 Invited Assistant (University Teacher) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
2015/02/01 - 2021/02/28 Tutor (University Teacher) Universidade de Lisboa Instituto Superior Técnico, Portugal
Universidade de Lisboa Instituto Superior Técnico, Portugal
Projects

Grant

Designation Funders
2019/01/01 - 2019/06/30 ARDITI-LARSYS-2018-001
UID/EEA/50009/2019
Post-doc Fellow
2018/07/01 - 2018/12/18 Strategic Plan - 2013/2015
UID/EEA/50009/2013
Master Student Fellow
2018/02/01 - 2018/06/30 Ultimate Performance Analysis Tool
UID/EEA/50008/2013
Research Fellow
Instituto de Telecomunicações, Portugal
2014/01/01 - 2018/01/01 PhD Grant
PD/BD/52242/2013
PhD Student Fellow
Instituto de Telecomunicações, Portugal
2012/10/01 - 2013/09/01 Projecto Estratégico
PEst-OE/EEI/LA009/2011
Master Student Fellow

Contract

Designation Funders
2021/08/02 - Current RELIABLE
PTDC/EEI-AUT/3522/2020
Post-doc
Universidade do Porto Faculdade de Engenharia, Portugal
2020/03/02 - Current HARMONY
POCI-01-0145-FEDER-031411-HARMONY
Post-doc
Outputs

Publications

Book chapter
  1. Ramos, Guilherme; Caleiro, Carlos. "A Novel Similarity Measure for Group Recommender Systems with Optimal Time Complexity". In Bias and Social Aspects in Search and Recommendation, 95-109. Springer International Publishing, 2020.
    10.1007/978-3-030-52485-2_10
Conference paper
  1. Guilherme Ramos; Mirko Marras; Ludovico Boratto. "Towards Ethical Item Ranking: A Paradigm Shift from User-Centric to Item-Centric Approaches". 2024.
    10.1145/3626772.3657977
  2. Guilherme Ramos; André M. H. Teixeira; Sérgio Pequito. "On the Trade-Offs Between Accuracy, Privacy, and Resilience in Average Consensus Algorithms". 2023.
    10.1109/cdc49753.2023.10383286
  3. Emily A. Reed; Guilherme Ramos; Paul Bogdan; Sérgio Pequito. "Mitigating Epilepsy by Stabilizing Linear Fractional-Order Systems". 2023.
    10.23919/acc55779.2023.10156404
  4. "Regulating Group Exposure for Item Providers in Recommendation". 2022.
    10.1145/3477495.3531760
  5. "Reputation Equity in Ranking Systems". 2021.
    10.1145/3459637.3482171
  6. Ramos, Guilherme; Silvestre, Daniel; Silvestre, Carlos. "A general discrete-time method to achieve resilience in consensus algorithms". Paper presented in IEEE Conference on Decision and Control, 2020.
    10.1109/cdc42340.2020.9304107
  7. Ramos, Guilherme; Silvestre, Daniel; Silvestre, Carlos. "A General Discrete-Time Method to Achieve Resilience in Consensus". Paper presented in 2020 59th IEEE Conference on Decision and Control (CDC), 2020.
  8. Ramos, Guilherme; Boratto, Ludovico. "Reputation (In)dependence in Ranking Systems: Demographics Influence Over Output Disparities". 2020.
    10.1145/3397271.3401278
  9. Ramos, G.; Pequito, S.; Caleiro, C.. "The robust minimal controllability problem for switched linear continuous-time systems". 2018.
    10.23919/ACC.2018.8431919
  10. Saude, J.; Ramos, G.; Caleiro, C.; Kar, S.. "Reputation-based ranking systems and their resistance to bribery". 2017.
    10.1109/ICDM.2017.139
  11. Ramos, G.; Pequito, S.; Aguiar, A.P.; Kar, S.. "Analysis and design of electric power grids with p-robustness guarantees using a structural hybrid system approach". 2015.
    10.1109/ECC.2015.7331082
  12. Ramos, G.; Pequito, S.; Aguiar, A.P.; Ramos, J.; Kar, S.. "A model checking framework for linear time invariant switching systems using structural systems analysis". 2013.
    10.1109/Allerton.2013.6736631
Journal article
  1. Guilherme Ramos; A. Pedro Aguiar; Sérgio Pequito. "Minimum jointly structural input and output selection". Automatica (2024): http://dx.doi.org/10.1016/j.automatica.2024.111668.
    10.1016/j.automatica.2024.111668
  2. Guilherme Ramos; A. Pedro Aguiar; Soummya Kar; Sérgio Pequito. "Privacy Preserving Average Consensus Through Network Augmentation". IEEE Transactions on Automatic Control (2024): http://dx.doi.org/10.1109/tac.2024.3383795.
    10.1109/tac.2024.3383795
  3. Emily A. Reed; Guilherme Ramos; Paul Bogdan; Sérgio Pequito. "The role of long-term power-law memory in controlling large-scale dynamical networks". Scientific Reports (2023): https://doi.org/10.1038/s41598-023-46349-9.
    10.1038/s41598-023-46349-9
  4. Guilherme Ramos; Sérgio Pequito. "Designing communication networks for discrete-time consensus for performance and privacy guarantees". Systems & Control Letters (2023): https://doi.org/10.1016/j.sysconle.2023.105608.
    10.1016/j.sysconle.2023.105608
  5. Guilherme Ramos; Daniel Silvestre; Carlos Silvestre. "A Discrete-Time Reputation-Based Resilient Consensus Algorithm for Synchronous or Asynchronous Communications". IEEE Transactions on Automatic Control (2023): https://doi.org/10.1109/TAC.2023.3266982.
    10.1109/TAC.2023.3266982
  6. Daniel Silvestre; Guilherme Ramos. "Model Predictive Control with Collision Avoidance for Unknown Environment". IEEE Control Systems Letters (2023): https://doi.org/10.1109/LCSYS.2023.3288884.
    10.1109/LCSYS.2023.3288884
  7. Guilherme Ramos. "Minimum structural sensor placement for switched linear time-invariant systems and unknown inputs". Automatica 146 (2022): 110557-110557. http://dx.doi.org/10.1016/j.automatica.2022.110557.
    10.1016/j.automatica.2022.110557
  8. Guilherme Ramos. "A resilient continuous-time consensus method using a switching topology". Systems & Control Letters 169 (2022): 105381-105381. http://dx.doi.org/10.1016/j.sysconle.2022.105381.
    10.1016/j.sysconle.2022.105381
  9. "Fractional cyber-neural systems — A brief survey". Annual Reviews in Control (2022): http://dx.doi.org/10.1016/j.arcontrol.2022.06.002.
    10.1016/j.arcontrol.2022.06.002
  10. "Robust reputation independence in ranking systems for multiple sensitive attributes". Machine Learning (2022): http://dx.doi.org/10.1007/s10994-022-06173-0.
    10.1007/s10994-022-06173-0
  11. "An overview of structural systems theory". Automatica 140 (2022): 110229-110229. http://dx.doi.org/10.1016/j.automatica.2022.110229.
    10.1016/j.automatica.2022.110229
  12. "Enabling cross-continent provider fairness in educational recommender systems". Future Generation Computer Systems 127 (2022): 435-447. http://dx.doi.org/10.1016/j.future.2021.08.025.
    10.1016/j.future.2021.08.025
  13. Guilherme Ramos. "A Scalable Distributed Dynamical Systems Approach to Compute the Strongly Connected Components and Diameter of Networks". IEEE Transactions on Automatic Control (2022): 1-8. http://dx.doi.org/10.1109/tac.2022.3209446.
    10.1109/tac.2022.3209446
  14. "Evaluating the Prediction Bias Induced by Label Imbalance in Multi-label Classification". Proceedings of the 30th ACM International Conference on Information & Knowledge Management (2021): http://dx.doi.org/10.1145/3459637.3482100.
    10.1145/3459637.3482100
  15. "Equality of Learning Opportunity via Individual Fairness in Personalized Recommendations". International Journal of Artificial Intelligence in Education (2021): http://dx.doi.org/10.1007/s40593-021-00271-1.
    10.1007/s40593-021-00271-1
  16. "A Robust Reputation-Based Group Ranking System and Its Resistance to Bribery". ACM Transactions on Knowledge Discovery from Data 16 2 (2021): 1-35. http://dx.doi.org/10.1145/3462210.
    10.1145/3462210
  17. "The robust minimal controllability and observability problem". International Journal of Robust and Nonlinear Control 31 10 (2021): 5033-5044. http://dx.doi.org/10.1002/rnc.5527.
    10.1002/rnc.5527
  18. "Structurally quotient fixed modes". Systems & Control Letters 151 (2021): 104914-104914. http://dx.doi.org/10.1016/j.sysconle.2021.104914.
    10.1016/j.sysconle.2021.104914
  19. Ramos, Guilherme; Silvestre, Daniel; Silvestre, Carlos. "Node and network resistance to bribery in multi-agent systems". Systems & Control Letters 147 (2021): 104842. http://dx.doi.org/10.1016/j.sysconle.2020.104842.
    10.1016/j.sysconle.2020.104842
  20. "Minimum jointly structural input and output selection for strongly connected networks". (2021): https://arxiv.org/abs/2111.13449.
    10.48550/ARXIV.2111.13449
  21. "A scalable distributed dynamical systems approach to compute the strongly connected components and diameter of networks". (2021): https://arxiv.org/abs/2105.10229.
    10.48550/ARXIV.2105.10229
  22. "Minimum Structural Sensor Placement for Switched Linear Time-Invariant Systems and Unknown Inputs". (2021): https://arxiv.org/abs/2107.13493.
    10.48550/ARXIV.2107.13493
  23. "Fractional cyber-neural systems -- a brief survey". (2021): https://arxiv.org/abs/2112.08535.
    10.48550/ARXIV.2112.08535
  24. "A Discrete-time Reputation-based Resilient Consensus Algorithm for Synchronous or Asynchronous Communications". (2021): https://arxiv.org/abs/2107.00431.
    10.48550/ARXIV.2107.00431
  25. Ramos, Guilherme; Silvestre, Daniel; Silvestre, Carlos. "General resilient consensus algorithms". International Journal of Control (2020): 1-15. http://dx.doi.org/10.1080/00207179.2020.1861331.
    10.1080/00207179.2020.1861331
  26. Ramos, Guilherme; Pequito, Sérgio. "Generating complex networks with time-to-control communities". PLOS ONE 15 8 (2020): e0236753. http://dx.doi.org/10.1371/journal.pone.0236753.
    10.1371/journal.pone.0236753
  27. CAO, QI; RAMOS, GUILHERME; BOGDAN, PAUL; PEQUITO, SÉRGIO. "THE ACTUATION SPECTRUM OF SPATIOTEMPORAL NETWORKS WITH POWER-LAW TIME DEPENDENCIES". Advances in Complex Systems (2020): 1950023. http://dx.doi.org/10.1142/s0219525919500231.
    10.1142/s0219525919500231
  28. Ramos, G.; Boratto, L.; Caleiro, C.. "On the negative impact of social influence in recommender systems: A study of bribery in collaborative hybrid algorithms". Information Processing and Management 57 2 (2020): http://www.scopus.com/inward/record.url?eid=2-s2.0-85068216411&partnerID=MN8TOARS.
    10.1016/j.ipm.2019.102058
  29. "Structural Systems Theory: an overview of the last 15 years". (2020): https://arxiv.org/abs/2008.11223.
    10.48550/ARXIV.2008.11223
  30. Ramos, G.; Pequito, S.; Caleiro, C.. "On the index of convergence of a class of Boolean matrices with structural properties". International Journal of Control (2019): http://www.scopus.com/inward/record.url?eid=2-s2.0-85071160755&partnerID=MN8TOARS.
    10.1080/00207179.2019.1656822
  31. Pequito, S.; Ramos, G.; Kar, S.; Aguiar, A.P.; Ramos, J.. "The robust minimal controllability problem". Automatica 82 (2017): 261-268. http://www.scopus.com/inward/record.url?eid=2-s2.0-85019559627&partnerID=MN8TOARS.
    10.1016/j.automatica.2017.04.053
Activities

Oral presentation

Presentation title Event name
Host (Event location)
2018/12/13 Improving Information Security in Ranking Systems and Control Systems (https://www.fst.um.edu.mo/event/improving-information-security-in-ranking-systems-and-control-systems/)
Department of Electrical and Computer Engineering (Macau SAR China)
2017/10/12 Robust reputation-based ranking on bipartite networks (TIME Association) Poster Presentation: TIME Association 2017 (IST)
TIME Association 2017 (IST)
2017/07/03 Robust reputation-based ranking on bipartite networks (Meeting with Science and Technology in Portugal) Poster Presentation: Meeting with Science and Technology in Portugal
Meeting with Science and Technology in Portugal
2017/04/05 Robust reputation-based ranking on bipartite networks (PhD Open Days) Poster Presentation: PhD Open Days (IST)
Instituto Superior Técnico
2016/07/11 Symbolic Probabilistic Analysis of Side-Channel Information Encontro Nacional Sociedade Portuguesa de Matemática 2016
Instituto Politécnico de Setúbal (Barreiro, Portugal)
2015/11/09 Symbolic Probabilistic Analysis of Side-Channel Information (PhD Open Days) PhD Open Days (IST)
Instituto Superior Técnico

Event participation

Activity description
Type of event 		Event name
Institution / Organization
2018/09/10 - 2018/09/12 Teaching STEM Students - Transformation Guide for Teaching Assistants 1st Ed.
Workshop
 Teaching STEM Students - Transformation Guide for Teaching Assistants 1st Ed.
Universidade de Lisboa Instituto Superior Técnico, Portugal
2017/11/18 - 2017/11/21 Apresentação oral do artigo de conferência: Reputation-based Ranking Systems and their Resistance to Bribery
Conference
 International Conference on Data Mining
IEEE, United States
2017/10/12 - 2017/10/13 Apresentação de poster em TIME Association 2017 (IST)
Meeting
 TIME Association 2017 (IST)
Universidade de Lisboa Instituto Superior Técnico, Portugal
2017/04/05 - 2017/04/06 Apresentação de poster: PhD Open Days (IST) PhD Open Days (IST)
Universidade de Lisboa Instituto Superior Técnico, Portugal
2016/07/03 - 2016/07/05 Apresentação de poster: Encontro com a Ciência e Tecnologia em Portugal
Meeting
 Encontro com a Ciência e Tecnologia em Portugal
Ciência Viva, Portugal
2016/06/28 - 2016/07/01 Participação em conferência: 29th IEEE Computer Security Foundations Symposium
Conference
 29th IEEE Computer Security Foundations Symposium
IEEE, United States
2015/11/09 - 2015/11/12 Apresentação de poster: PhD Open Days (IST)
Meeting
 PhD Open Days (IST)
Universidade de Lisboa Instituto Superior Técnico, Portugal
2014/07/14 - 2014/07/18 TRUDEVICE training summer school
Workshop
 TRUDEVICE training summer school
Universidade de Lisboa Instituto Superior Técnico, Portugal
2014/07/10 - 2014/07/12 SAT/SMT Summer School
Workshop
 SAT/SMT Summer School

Course / Discipline taught

Academic session Degree Subject (Type) Institution / Organization
2021/11/29 - 2022/02/04 Algorithms and Computational Modelling Mestrado Integrado em Engenharia Biomédica (Licenciatura) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
2021/10/01 - 2021/11/12 Elements of Programming Licenciatura em Matemática Aplicada e Computação (Licenciatura) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
2021/03/01 - 2021/07/31 Theory of Computation Licenciatura em Engenharia Informática e de Computadores (Licenciatura) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
2020/10/01 - 2021/02/28 Elements of Programming (1st semester) Licenciatura em Matemática Aplicada e Computação (Licenciatura) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
2015/02/01 - 2020/07/31 Algorithms and Computational Modelling (2nd semester) Mestrado Integrado em Engenharia Biomédica (Mestrado integrado) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
2015/09/01 - 2020/02/29 Computation and Programming (1st semester) Mestrado Integrado em Engenharia Química (Mestrado integrado) Universidade de Lisboa Instituto Superior Técnico Departamento de Matemática, Portugal
Distinctions

Award

2021 Academic Excellence Award

Other distinction

2012 Academic Merit Board, Msc in Mathematics and Applications at Instituto Superior Técnico, University of Lisbon