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Dai Owaki

Publications and source records attributed to Dai Owaki.

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A Jellyfish Cyborg: Exploiting Natural Embodied Intelligence as Soft Robots

Jellyfish cyborgs present a promising avenue for soft robotic systems, leveraging the natural energy-efficiency and adaptability of biological systems. Here we demonstrate a novel approach to predicting and controlling jellyfish locomotion by harnessing the natural embodied intelligence of these animals. We developed an integrated muscle electrostimulation and 3D motion capture system to quantify both spontaneous and stimulus-induced behaviors in Aurelia coerulea jellyfish. Using Reservoir Computing, a machine learning framework, we successfully predicted future movements based on the current body shape and natural dynamic patterns of the jellyfish. Our key findings include the first investigation of self-organized criticality in jellyfish swimming motions and the identification of optimal stimulus periods (1.5 and 2.0 seconds) for eliciting coherent and predictable swimming behaviors. These results suggest that the jellyfish body motion, combined with targeted electrostimulation, can serve as a computational resource for predictive control. Our findings pave the way for developing jellyfish cyborgs capable of autonomous navigation and environmental exploration, with potential applications in ocean monitoring and pollution management.

cs.RO

Interlimb neural connection is not required for gait transition in quadruped locomotion

Quadrupeds transition spontaneously to various gait patterns (e.g., walk, trot, pace, gallop) in response to the locomotion speed. The generation of these gait patterns has been the subject of debate for a long time. We propose a coupled oscillator model that is coupled with the physical interactions of the body. The results of this study showed that the gait pattern transitions spontaneously to walking/trotting/pacing/bounding in manner similar to that of real quadruped animals when the resonating portion of the body is changed according to the speed of leg movement. We also observed that pacing is expressed exclusively instead of trotting by changing the physical characteristics. In addition to leading to understanding of the principles of locomotion in living things, the coupled oscillator model proposed in this study is expected to lead to the creation of a legged robot that can select an energy-efficient gait and transition to it spontaneously.

q-bio.QM