指尖脈波のゆらぎ解析によるドライバの心理状態の推定(機械力学,計測,自動制御)

概要

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An investigation quantifying the fluctuation of finger pulse and detecting the situation that driver's mental workload is extremely high was carried out in a driving simulator. The Lyapnov exponent, which is one of the state variables quantifying the fluctuation of finger pulse, was evaluated in terms of the accuracy to detect the hazardous driving situation. The Lyapnov exponent will fluctuate according to the measuring condition or physical condition of driver. But, the normalized Lyapnov exponent, meaning the ratio of the Lyapnov exponent relative to that during the ordinary driving situation, fluctuate in the same range between 120 [%] and 180 [%], when the driver's mental workload is high. The threshold of the normalized Lyapnov exponent dividing the hazardous situation with ordinary driving situation is approximately 120 [%]. It is possible to estimate that the driver is facing the hazardous driving situation if the normalized Lyapnov exponent of the driver's ringer pulse is higher than 120 [%].
社団法人日本機械学会の論文
2008-07-25