Patent 8493082 was granted and assigned to Electronics and Telecommunications Research Institute on July, 2013 by the United States Patent and Trademark Office.
A seating sensing device embedded in a seat includes: a variable resistance unit generating resistance values corresponding to the circumference of the seat through a plurality of conductive threads installed in the seat; and a signal analysis unit analyzing variable quantities of the resistance values to acquire activity information on one or more of whether a user is seated or not, a seating posture, and a seating posture change.