It is an object of the invention to provide a structure for connecting a compressor wheel and a shaft, which structure is not easily broken when rotated at high speed. The \u201cNodes\u201d also broadcast commands and status information to the network for the purpose of being monitored andor responded to by other \u201cNodes\u201d on the network. Also disclosed is an image forming device having the flash fixing device. The boost switches are supplied input voltage and input current from a power source. The links can be repaired based on the stored information.