An electric generator 10 of the present invention comprises a permanent magnet 14, a coil 30, a yoke 20, and attracted means 19 composed of a plurality of attracted pieces 18 which are arranged radially around the rotation axis 12 and are magnetized by the permanent magnet 14. In ion implantation process for controlling the threshold voltage of the transistor or the semiconductor device such as a flash memory cell, the dose of the impurity capable of securing the uniformity is implanted by minimum. The ISA system 130 includes a personal assistant device, or the like, that interacts with the user, and performs operations on the user’s behalf. The sensor may include a sensor unit and at least a microcoil. The network addresses generated to specific locations within a workflow system are intended for specific recipients but may be shared by the recipients as circumstances require.