For nocturnal frogs, barking is important for breeding and communication.It is the male who screams loudly, not disjointed but with some regularity.As a result of analyzing the recorded data of male Japanese tree frogs, the research group has the property of "aligning the ringing sections" on a long time scale, in addition to the result of the previous research that "the timing of males singing is staggered". I found it.Next, we hypothesized that each frog loses energy and becomes more tired each time it crows.After that, we proposed a mathematical model that stochastically switches between vocalization and hibernation depending on energy, fatigue, and the presence or absence of males ringing around, and reproduced the results qualitatively.

　Furthermore, this frog chorus model is applied to autonomous decentralized control of wireless sensor networks (control by individual judgment of each terminal). Considering the situation where 100 wireless terminals with sensors are installed, the communication timing was controlled for each terminal according to the chorus model.From this numerical simulation, it was found that "nearby terminals can switch between communication state and hibernation state all at once while avoiding packet collision (failure of transfer due to simultaneous data transmission)".Due to this property, in addition to the performance of avoiding packet collisions between nearby terminals, it is possible to improve the connectivity and energy saving performance of the entire network.

　This is expected to result in basic research on the collective behavior of living organisms and to develop as a new technology (biomimetics) learned from living organisms.

Paper information:[Royal Society Open Science] Mathematical Modeling and Application of Frog Choruses as an Autonomous Distributed Communication System