Resume
tags: research, publications, optimization, combinatorial-optimization, evolutionary-computation, metaheuristics, machine-learning, multi-agent-systemsResearch Summary
My research focuses on highly constrained combinatorial optimization problems. I investigate how infeasible regions can provide structural information to guide search processes, combining fitness landscape analysis, metaheuristics, and multi-agent systems.
Conference Papers
2026
A Constructive Method to Build Many Valid Initial Solutions for the Traveling Tournament Problem
Guilherme Nakahata, F. Richoux, D. van den Berg, C. Aranha EvoApplications (EvoApps) — Toulouse, France, 2026
PDF · DOI: 10.1007/978-3-032-23607-4_27 · Repository
Bons-AI: An Agent-Based Model to Evaluate the Behavior of Bonsai Grower According to Different Levels of Communication and Experience
S. Satake, Guilherme Nakahata, C. Aranha International Conference on Autonomous Agents and Multiagent Systems (AAMAS), Cyprus, 2026
PDF · DOI: 10.65109/UHQU6299 · Repository
Decision-Making Policies under Stigmergic Communication: A Pheromone-Based Multi-Agent Study
A Pheromone-Based Multi-Agent Study S. Satake, Guilherme Nakahata, C. Aranha IEEE World Congress on Computational Intelligence (WCCI-CEC), 2026
PDF · DOI: placeholder · Repository
Bioinspired strategy for coordinating multiple unmanned aerial vehicles for surveillance tasks
S. Satake, Guilherme Nakahata, R. Calvo IEEE World Congress on Computational Intelligence (WCCI-CEC), Netherlands, 2026
PDF · DOI: placeholder · Repository
2025
Bird Apprehension Forecasting with XGBoost
F. Diniz, J. Luis, Guilherme Nakahata Computer on the Beach — Florianópolis, Brazil, 2025
PDF · DOI: 10.14210/cotb.v16.p154-159
2023
Metaheuristic VNS applied to the crew rostering problem in the intercity and interstate public transport
Guilherme Nakahata, L. Saviniec, A. Constantino Brazilian Symposium on Operations Research (SBPO) — São José dos Campos, Brazil, 2023
PDF · DOI: 10.59254/sbpo-2023-174797
2020
Bonsai Style Classification: A New Database and Baseline Results
Guilherme Nakahata, A. Constantino, Y. Maldonado IEEE International Symposium on Multimedia (ISM) — Naples, Italy, 2020
PDF · DOI: 10.1109/ISM.2020.00025 · Repository
Education
PhD in Computer Science, University of Tsukuba (2025–Present)
M.Sc. in Computer Science, State University of Maringá (2022)
B.Sc. in Computer Science, State University of Paraná (2019)
Academic & Research Experience
Research Assistant, AIST (2025–Present)
Teaching Assistant (CS Seminar), University of Tsukuba (2025–Present)
Research Student, University of Tsukuba (2024–2025)
Substitute Assistant Professor, UNESPAR (2023–2024)
Assistant Professor, Apucarana University (2023)
International Collaborations
- Collaboration with Manna Team (Brazil) – Research project funded by Araucaria Foundation (2026-Present
Scholarships
MEXT Scholarship (Japan), 2024–Present
CAPES Scholarship (Brazil), 2020–2022