Abstract: A system for monitoring a sitting posture includdes a first pressure sensor for sensing a pressure applied to a chair by the left thigh, a second pressure sensor for sensing a pressure applied to the chair by the right thigh, a third pressure sensor for sensing a pressure applied to the chair by the left buttock, a fourth pressure sensor for sensing a pressure by the right buttock, a fifth pressure sensor for sensing a pressure applied to the chair by the left back, and a sixth pressure sensor for sensing a pressure applied to the chair by the right back; a control unit for converting pressure values sensed by the first pressure sensor, the second pressure sensor, the third pressure sensor, the fourth pressure sensor, the fifth pressure sensor and the sixth pressure sensor; and a monitoring unit for storing and displaying the pressure digital data.

Abstract: A method and apparatus for readily measuring a blood pressure without using a cuff includes measuring, by a portable blood pressure measuring apparatus, an electrocardiogram signal and a pulse wave signal, transmitting the measured electrocardiogram signal and pulse wave signal to a portable terminal, calculating, by the portable terminal, a Pulse Transit Time (PTT) and a Pulse Wave Velocity (PWV) using the transmitted electrocardiogram signal and the pulse wave signal, and calculating a blood pressure value based on the PTT and the PWV. Therefore, users may readily measure a blood pressure at any time and place and may be provided with a customized blood pressure measurement result.

Abstract: A method and an apparatus are provided for measuring a pulse frequency in a bio-signal measurement device. A bio-signal collected by a sensor is applied as an input signal of a notch filter. A filter coefficient of the notch filter is adaptively changed according to a result of tracking the bio-signal in the notch filter and calculating a pulse frequency corresponding to the filter coefficient of the notch filter.

Abstract: A method and an apparatus are provided for measuring a pulse frequency in a bio-signal measurement device. A bio-signal collected by a sensor is applied as an input signal of a notch filter. A filter coefficient of the notch filter is adaptively changed according to a result of tracking the bio-signal in the notch filter and calculating a pulse frequency corresponding to the filter coefficient of the notch filter.