Abstract: A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIGfield.

Abstract: Disclosed is a core stability exercise management system. The core stability exercise management system may comprise: at least one detection unit for detecting the force at which the abdominal muscles contract and push a pressure sensor; a reference value control unit for, if the abdominal muscles are maximally contracted, receiving the maximum value measured by the detection unit, calculating a reference value which is 1/n (n is a real number) of the maximum value, and displaying the reference value in every corresponding section on a display device; and a measurement value control unit for receiving a measurement value detected by the detection unit according to the contraction and relaxation of the abdominal muscles, and displaying the measurement value on the display device on which the reference value is displayed.