A method and apparatus for detecting symbols in a Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing system. The device displays a predetermined series of exercise tasks seriatim in a predetermined sequence, displaying each repetition of each task in the proper cadence according to a set of variable parameters that specify how each maneuver is to be displayed. A sidewall is formed on a side surface of the transfer gate electrode. The binding element is removable to allow the segments to be individually distributed within the storage device. The imaging technique of the present invention exploits these properties, as well as the polarization properties of light to sense information about the scattering media. In the apparatus for controlling multiple powers, an on-signal of high level is applied to an input terminal, and an output of a control signal generating unit is sequentially changed to a high level whenever a clock is applied to a clock signal input terminal by one period, so that outputs of the multiple powers are sequentially output.