Abstract: According to an embodiment, a power supply system for an electric motor car includes a first terminal, a second terminal, and a conversion unit. The first terminal is electrically connected to one of a power storage device and an overhead wire provided within a formation of electric motor cars. The second terminal is electrically connected to a lead wire together with a plurality of electric motors within the formation, a host power supply device, an external power supply device different from the host power supply device.

Abstract: A semiconductor device with a thickness of 1 mm or less is disclosed, that comprises a frame plate main body with a thickness in the range from 0.1 mm to 0.25 mm, a semiconductor pellet disposed on a first surface of the frame plate main body and with a thickness in the range from 0.2 mm to 0.3 mm, an external connection lead, one end thereof being connected to a peripheral portion of the first surface of the frame plate main body, the other end thereof extending to the outside of the frame plate main body, a bonding wire for electrically connecting an electrode of the semiconductor pellet and a connection portion of the end of the external connection lead, and a sealing resin layer for covering and sealing at least a region including the semiconductor pellet, the bonding wire, and a connection portion.

Abstract: Unique data block identifiers are assigned to the entire data block group of plural external memory devices. The file management information stores, in a table format, the unique data block identifiers in connection with a file held in the data block group. When a file management process is executed in accordance with the operation type (access, addition, registration, deletion) of file management, the file management information is referred to. Furthermore, a data block group management process is called and the operation is performed. When a data block shift process is executed, the data block group management process is called and the contents of the data block are shifted between external memory device based on the file management information. When the file management process or the data block shift process is executed, data stored in the file management information is rewritten on an as-needed basis.