Abstract: An authentication method comprising creating electrocardiogram data of users; calculating a similarity between electrocardiogram data of each user and template data created by averaging electrocardiogram data of each user; creating and training a first NNmodel for every user by using similarities between electrocardiogram data of a user and template data of the same user and similarities between electrocardiogram data of a user and template data of another user, and creating and training second NNmodels for users by using similarities between electrocardiogram data of a user and template data of the user and similarities between electrocardiogram data of the user and template data of another user; and executing a first step in which the similarities calculated using electrocardiogram data for authentication of a user to be authenticated and template data are input to the first NNmodel, and executing a second step in which the similarities are input to the second NNmodels.

Abstract: An information processing system is provided to reduce labor of medical staff in determining heart failure stage. The information processing system is configured to execute: a reading step of reading out an input first electrocardiogram including an electrocardiogram of a user; and a determination step of determining a heart failure stage of the user based on the first electrocardiogram and reference information, wherein the reference information is information showing a relationship between the second electrocardiogram, including the electrocardiogram obtained beforehand, in which the heart failure stage has been determined by the physician, and a feature quantity of the heart failure, wherein: the reference information is a learned model in which the feature quantity of the heart failure is learned from the second electrocardiogram, and the learned model is a model that learned a content determined in the determination step and corresponding clinical data.

Abstract: Provided is a power supply circuit that supplies electric power to a biological signal measurement circuit configured to detect, with an electrode set in contact with a human body, a biological signal which is a weak electric signal emitted by the human body. The power supply circuit includes a capacitance element accumulating the electric power, and a circuit switch coupled between the capacitance element and an external power supply for supplying electric power to the capacitance element, and configured to switch, not through a state where the external power supply and the biological signal measurement circuit are electrically coupled, a first state where the capacitance element establishes electrical continuity with the external power supply and is enabled to be charged, and a second state where the capacitance element establishes electrical continuity with the biological signal measurement circuit and is enabled to supply power to the biological signal measurement circuit.