Abstract: An apparatus and method for detecting a cable fault which simultaneously apply a plurality of measurement frequencies mutually orthogonal to a cable and estimate reflection coefficients at the measurement frequencies using filters for filtering only the respective measurement frequencies to reduce a time taken to detect a cable fault.

Abstract: An apparatus and method for detecting a cable fault which simultaneously apply a plurality of measurement frequencies mutually orthogonal to a cable and estimate reflection coefficients at the measurement frequencies using filters for filtering only the respective measurement frequencies to reduce a time taken to detect a cable fault.

Abstract: According to the present disclosure, a door handle structure for an entrance/exit door is configured such that a door handle does not protrude from the entrance/exit door to thereby prevent injuries to children or adults caused by collisions against it, prevent clothing from becoming caught in and torn by it, and lengthen the service life of the product by preventing collisions. Further, the door handle structure uses a reduced number of parts, thereby reducing manufacturing costs and improving durability. The door handle structure of the present invention has no protruding portion, thereby preventing a nearby wall from being damaged by a collision of the door handle against the nearby wall, eliminating the necessity of management of the wall and thereby maintaining the cleanliness of the wall. The service life of the door handle structure is lengthened by preventing collisions of the door handle against the wall.