Arousal level control apparatus, arousal level control method, and recording medium

1. An arousal level control apparatus comprising:

at least one memory configured to store instructions; and

at least one processor configured to execute the instructions to:

calculate a setting value of a control device under a constraint condition using an arousal level optimization model so that a value of an objective function is maximized, the control device affecting a physical quantity of a surrounding environment that affects arousal level of a subject, the arousal level optimization model including the constraint condition and the objective function, the constraint condition including a physical quantity prediction model, an arousal level prediction model, and a setting value range condition that the setting value is within a predetermined range, the physical quantity prediction model being an explicit function that includes the physical quantity and the setting value as explanatory variables and has a predicted value of the physical quantity as an explained variable, the arousal level prediction model being an explicit function that includes the physical quantity and variation thereof over time as explanatory variables and has a predicted value of variation of the arousal level over time as an explained variable, the objective function expressing a total value or an average value of a predicted value for one or more targets including the target, the predicted value for the one or more targets being a predicted value of variation in the arousal level for the one or more subjects and two or more time steps that satisfies a predetermined condition; and

set the calculated setting value to the control device.

2. The arousal level control apparatus according to claim 1 , wherein the constraint condition includes a comfort condition that a sum of comfort penalty scores calculated for a plurality of setting values including the setting value is within a predetermined range.

3. The arousal level control apparatus according to claim 1 , wherein the arousal level prediction model includes variation of the arousal level over time as an explanatory variable.

4. The arousal level control apparatus according to claim 1 , wherein the arousal level prediction model includes temporal variance of the arousal level as an explanatory variable.

5. An arousal level control method executed by a computer, comprising:

calculating a setting value of a control device under a constraint condition using an arousal level optimization model so that a value of an objective function is maximized, the control device affecting a physical quantity of a surrounding environment that affects arousal level of a subject, the arousal level optimization model including the constraint condition and the objective function, the constraint condition including a physical quantity prediction model, an arousal level prediction model, and a setting value range condition that the setting value is within a predetermined range, the physical quantity prediction model being an explicit function that includes the physical quantity and the setting value as explanatory variables and has a predicted value of the physical quantity as an explained variable, the arousal level prediction model being an explicit function that includes the physical quantity and variation thereof over time as explanatory variables and has a predicted value of variation of the arousal level over time as an explained variable, the objective function expressing a total value or an average value of a predicted value for one or more targets including the target, the predicted value for the one or more targets being a predicted value of variation in the arousal level for the one or more subjects and two or more time steps that satisfies a predetermined condition; and

setting the calculated setting value to the control device.

6. A non-transitory recording medium that stores a program causing a computer to execute:

calculating a setting value of a control device under a constraint condition using an arousal level optimization model so that a value of an objective function is maximized, the control device affecting a physical quantity of a surrounding environment that affects arousal level of a subject, the arousal level optimization model including the constraint condition and the objective function, the constraint condition including a physical quantity prediction model, an arousal level prediction model, and a setting value range condition that the setting value is within a predetermined range, the physical quantity prediction model being an explicit function that includes the physical quantity and the setting value as explanatory variables and has a predicted value of the physical quantity as an explained variable, the arousal level prediction model being an explicit function that includes the physical quantity and variation thereof over time as explanatory variables and has a predicted value of variation of the arousal level over time as an explained variable, the objective function expressing a total value or an average value of a predicted value for one or more targets including the target, the predicted value for the one or more targets being a predicted value of variation in the arousal level for the one or more subjects and two or more time steps that satisfies a predetermined condition; and

setting the calculated setting value to the control device.