Abstract: The invention relates to a headset apparatus for detecting a multi bio-signal comprising: a headset body configured to be mounted on a user's head; a plurality of electrodes which are exposed on an outer surface of the headset body so as to be in contact with a forehead of a user when the headset body is mounted on a user's head; a brainwave detection unit which is embedded in the headset body and which detects a brainwave signal based on a signal detected by the plurality of electrodes; a heartbeat detection module which extends from the headset body through a signal cable and which is configured to be mounted on a user's ear to detect a heartbeat signal; and a headset controller to determine a complex stress index based on the brainwave signal detected by the brainwave detection unit and the heartbeat signal detected by the heartbeat detection module.

Abstract: The present invention relates to a health-abnormal condition alarm system using a multi bio-signal comprising: a wearable device which is configured to be worn on a user's body and senses the multi bio-signal; and a mobile communication terminal receiving a brainwave signal, a heartbeat signal, and a body temperature signal transmitted from the wearable device through a first communications network. The wearable device comprises a headset body, a plurality of electrodes, a brainwave detection unit, a heartbeat detection module, a body temperature detection unit, a headset wireless communication unit, and a headset controller.

Abstract: The invention relates to a headset apparatus for detecting a multi bio-signal comprising: a headset body configured to be mounted on a user's head; a plurality of electrodes which are exposed on an outer surface of the headset body so as to be in contact with a forehead of a user when the headset body is mounted on a user's head; a brainwave detection unit which is embedded in the headset body and which detects a brainwave signal based on a signal detected by the plurality of electrodes; a heartbeat detection module which extends from the headset body through a signal cable and which is configured to be mounted on a user's ear to detect a heartbeat signal; and a headset controller to determine a complex stress index based on the brainwave signal detected by the brainwave detection unit and the heartbeat signal detected by the heartbeat detection module.

Abstract: A welding horn for a secondary battery, used in ultrasonic welding includes a body portion having coupling portions respectively provided at one and the other ends thereof; and a tip portion provided at a central portion of the body portion and having protruding portions provided on a surface thereof. In the welding horn, a nitride is coated on at least one surface of the welding horn.

Abstract: A welding horn for a secondary battery, used in ultrasonic welding includes a body portion having coupling portions respectively provided at one and the other ends thereof; and a tip portion provided at a central portion of the body portion and having protruding portions provided on a surface thereof. In the welding horn, a nitride is coated on at least one surface of the welding horn.