| 研究実績の概要 |
This fiscal year, attention was paid to the systematic and thorough investigation of the changes in dynamical properties of complex dynamics due to the data limitations such as the data resolution and length, which are essential factors when dealing with the experimentally measured photoplethysmogram (PPG), and especially in the case of the video recording-based imaging PPG.
First, dynamics changes were investigated in a nonlinear model with properties resembling those of the PPG. Then conventional PPGs were investigated. As a result, the effect of PPG recording length on its dynamical characteristics was clarified, and the minimum length for robust dynamical properties estimation was evaluated. In particular, it was found that such important dynamical properties as determinism and the complexity expressed by the entropy can be correctly estimated even from very short recordings.
Preliminary results also demonstrated that the PPG dynamics can be potentially reconstructed from the highly sparse marked point process data generated from conventional PPG data, which is essential for the investigation of imaging PPG dynamical properties.
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| 次年度使用額が生じた理由 |
This fiscal year the significant amount was reserved for international conference participation. However, due to the effect of COVID-19 international conferences were held online, thus creating a significant amount unused. The remained amount will be used for conference participation in the next fiscal year and to cover journal publication expenses, such as the open access fee.
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