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Hayakawa Lab
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A lab that mathematically models and controls nonlinear phenomena in the real world.
AboutAbout the lab
Dynamical systems that connect the present and the future.
The Hayakawa Lab (DSL) studies the modeling and control of dynamical systems, which describe nonlinear phenomena that appear in the real world.
Its subjects range widely: machines such as hard disks and bipedal robots, living systems such as automated anesthesia control for humans, finance, and multi-agent systems.
Using tools from mathematics and information theory, the lab aims to discover the principles and laws behind systems and to present new ways of thinking about how to control them.
Student research in fiscal 2025 includes vehicle dispatch for on-demand transportation, mixed passenger-and-freight transport that carries people and cargo in the same vehicle, and the dynamics of epileptic seizures.
Key terms
- Dynamical system
- A mathematical description, in equations, of a mechanism whose state changes over time. Also called rikigakukei in Japanese
- Multi-agent system
- A system in which many entities that make their own decisions and act on them influence one another and operate together as a whole
- On-demand transportation
- A transportation service that decides routes and vehicle dispatch in response to user requests, rather than running on fixed routes and timetables
ResearchResearch themes
*Illustrative imageAssigning shared rides well
In on-demand shared transportation and in “mixed passenger-and-freight transport” that carries people and cargo in the same vehicle, the key is deciding who rides in which vehicle. The lab studies optimal matching that takes user satisfaction into account, and reward designs that keep the system stable.
*Illustrative imageDescribing how epileptic seizures arise
The lab studies a way of representing how seizures occur as the brain’s state shifts, using an “energy landscape” whose shape changes over time. It aims to understand the mechanism of seizures as the behavior of a system.
*Illustrative imageControl that is robust to disruption and attack
Control of wirelessly connected machines can be vulnerable to communication jamming and to the failure of, or attacks on, some of the machines. The lab clarifies how jamming affects control and devises mechanisms that let the whole group keep operating correctly even if some of its members malfunction.
MembersFaculty
The Hayakawa Lab consists of faculty members, a secretary, and doctoral, master’s, and undergraduate students.As of 2025
- Associate ProfessorTomohisa HayakawaPublications ↗
VoicesStudent voices
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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: “Neighborhood of attractor of discretized Lorenz system. XYZ(28) plane” German A. Chernykh & Irina A. Chernykh / CC BY-SA 4.0 (cropped)
- Assigning shared rides well: “CUMTD Ford E-450 1801+1418 SafeRides” Gh9449 / CC BY-SA 4.0 (cropped)
- Describing how epileptic seizures arise: “EEG Recording Cap” Chris Hope / CC BY 2.0 (cropped)
- Control that is robust to disruption and attack: “Kilobot robot swarm” asuscreative / CC BY-SA 4.0 (cropped)
- Related lab (石崎研究室): “High voltage transmission towers and lines” Stefan Andrej Shambora (St_A_Sh) / CC BY 2.0 (cropped)
- Related lab (井村研究室): “Berlin Air Route Traffic Control Center, 1987” Thomas Farr / Public domain (cropped)
- Related lab (畑中研究室): “Agricultural drone in use on rice field near Nisoshi, Aomori” Benlisquare / CC BY-SA 4.0 (cropped)
- Related lab (宮崎研究室): “Crash test dummies” National Institute of Standards and Technology / Public domain (cropped)
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