A personal vaporizer is disclosed. The apparatus detects presence or absence of a face area in each frame consisting of the video content data and decides a cutout range of the detected face area. At least a portion of the core is encircled by the coil. Appropriate attributes on the selected coredump disk are written to indicate that a coredump is in progress, and the location of the coredump data. The invention also relates to a method of transferring a cinema film roll between a storage cassette and an essentially horizontal circular table. A plurality of SCBs, each of having a 2-tiered switch for constituting the core network, includes the steps of buffering by the SCB a predetermined number of previously-transmitted frames when operating as a crossover bridge, and causing the SCB to retransmit selected ones of the buffered previously-transmitted frames to a terminal in response to a handover completion signal.