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Fujii Lab
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The lab uses computers to reproduce human behavior and explore the future of transportation and cities.
AboutAbout the lab
Supporting social consensus building through simulation
Fujii Lab studies social simulation to support consensus building in society.
Its main targets are huge complex systems, such as transportation and cities, in which many elements interact with one another.
The lab uses artificial intelligence techniques to model human behavior and develops large-scale simulation systems.
The simulations are used to analyze real-world situations, solve problems, and design future systems.
Key terms
- Complex system
- A system in which small interactions among its parts give rise to behavior of the whole that cannot be understood by looking at the parts alone
- Multi-agent system
- A mechanism in which many "agents" that make their own decisions and act on them interact with one another inside a computer
- Consensus building
- The process in which stakeholders with different positions discuss an issue and reach a conclusion that everyone can accept
NewsLab news
Published a review on simulation that supports decision-making in transportation and society
A paper analyzing post-COVID office attendance behavior was published in the Transactions of the Japanese Society for Artificial Intelligence
Published a paper on estimating transportation modes from sparse GPS data
A student received the Hatakeyama Award from the Japan Society of Mechanical Engineers
A student and Associate Professor Fujii received the Excellence Award at the Annual Conference of the Japanese Society for Artificial Intelligence
ResearchResearch themes
Society is a huge and complex system. Theory alone cannot capture its fine-grained dynamics, and repeating social experiments many times is difficult. The lab therefore develops new social simulation methods and presents the results in settings where stakeholders build consensus, with the aim of supporting decision-making.
*Illustrative imageDecision support through simulation
Before a new policy or technology is introduced into society, the lab uses simulation to check its effects and risks. The results are presented in discussions among stakeholders to help them find scenarios they can agree on.
*Illustrative imageModeling of social systems
The lab models society, a complex system, using network models, multi-agent systems, and other approaches. It combines coarse models with detailed ones and also works on making large-scale computation more efficient.
*Illustrative imageDevelopment of a traffic flow simulator
The lab develops ADVENTURE_Mates, a multi-agent traffic flow simulator in which each vehicle observes its surroundings and makes its own decisions. It uses this simulator to reduce and solve traffic problems such as congestion.
*Illustrative imageHybrid traffic flow models
A detailed model is used only at the transition points where congestion forms or dissolves, and a simple model is used everywhere else. This makes computation more efficient while maintaining accuracy, and supports the design of transportation systems.
MembersFaculty
The members of Fujii Lab include faculty, project specialists, doctoral, master's, and undergraduate students, and research collaborators (visiting researchers and commissioned researchers).As of 2026
- Associate ProfessorFujii HidekiPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Tokyo by night 2011” Nalilord / CC BY-SA 3.0 (cropped)
- Decision support through simulation: “BMI Konferenzsaal” Fridolin freudenfett / CC BY-SA 4.0 (cropped)
- Modeling of social systems: “Murmuration 11-2025” Skander zarrad / CC BY-SA 4.0 (cropped)
- Development of a traffic flow simulator: “Highway 403 meets 401” Haljackey / CC BY-SA 4.0 (cropped)
- Hybrid traffic flow models: “Backed up traffic on Carbon Canyon road” MorbidEntree / CC BY-SA 4.0 (cropped)
- Related lab (田中研究室): “Electricity pylons at sunset in Quebec City” Wilfredor / CC0 (cropped)
- Related lab (西野研究室): “Go” Dietmar Rabich / CC BY-SA 4.0 (cropped)
- Related lab (坂田・森・浅谷・西本研究室): “Social Network Visualization” Martin Grandjean / CC BY-SA 4.0 (cropped)
- Related lab (和泉研究室): “Scramble from above, SHIBUYA SKY ( ) (cropped)” Sei F from Tokyo, Japan / CC BY-SA 2.0 (cropped)
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