A method and a device for detecting the occupancy state of a seat, e. Also provided is use thereof to prepare sterile suspensions of drugs. The subflows may be still further classified into additional subflows, creating a hierarchical, layered prioritization that can be metered at each vertical and horizontal level of the hierarchy. The gate insulating film includes the second impurities in a region thereof located immediately above at least a portion of the channel region. Such signature is capable of being used to verify an authenticity of an update for a computer utilizing a public key.