Method and system for caring a psychological state using ballistocardiogram measured through piezoelectric elements

A system for caring for a psychological state of a user based on biometric information of the user, the system comprising:

• a wearable device and an external server;
• wherein the wearable device comprises:
• an air tube;
• an air inlet provided at one end of the air tube and configured to allow air to be injected into or discharged from the air tube;
• a driving unit configured to inject air into or discharge air from the air tube through the air inlet;
• a silicon tube disposed inside a housing of the driving unit and extending from the driving unit to be connected to the air inlet;
• a sensor module including a piezoelectric element positioned inside the silicon tube and configured to sense pressure;
• a first communication unit;
• a first artificial intelligence (AI) model unit;
• and
• a first processor positioned inside the silicon tube and operatively coupled to the driving unit, the sensor module, and the first AI model unit,
• and wherein the external server comprises:
• a second communication unit;
• a second AI model unit;
• and
• a second processor operatively coupled to the second communication unit and the second AI model unit,
• wherein the first processor is configured to:
• acquire air-pressure data indicating an air pressure inside the air tube through the piezoelectric element of the sensor module;
• determine whether a network connection is established between the wearable device and the external server to enable data communication therebetween;
• and
• when the network connection is determined to be established, transmit the air-pressure data to the external server through the first communication unit,
• wherein the second processor is configured to:
• receive the air-pressure data from the wearable device through the second communication unit;
• input the air-pressure data into a first AI model and a second AI model included in the second AI model unit, update the first AI model by training the first AI model to extract filtered data from the air-pressure data, and update the second AI model by training the second AI model to determine a state of the user;
• and
• when the network connection is determined to be established, transmit the updated first AI model and the updated second AI model to the wearable device through the second communication unit,
• and wherein the first processor is further configured to:
• receive the updated first AI model and the updated second AI model from the external server through the first communication unit;
• and
• determine the state of the user based on values obtained by processing the air-pressure data using the updated first AI model and the updated second AI model.