A method of controlling a power plant connected at a point of connection to an electricity grid is provided. In preferred embodiments, the carbon chain is a fatty acid residue. The method includes initiating a virtualization process in the business network according to the selected virtualization level option. The adjusting module multiplies the magnitude of each tone by the scale factor K, thus the volume of the music is kept to a suitable level without suffering from too small volume problem or signal distortion due to too large volume. The mass portion on the input end face side has a protrusion having a height equal to or less than a quarter of the oscillation wavelength, thereby obtaining a mass distribution. The transferred picture can be optionally returned to the first display area.