There is provided an AV server device in a home network for enabling transmissionreception of an AV content between digital AV apparatuses connected with communication interfaces of different standards while protecting copyright. The electromagnetic interference shielding apparatus includes a metal cover, a chassis having a waveguide output hole, and an adhesive. With such an arrangement, in a hydraulic drive system including an LS system, it is possible to ensure fine operability based on setting of the engine revolution speed, to perform flow rate control at a good response, and to realize superior operability. Spacers covering sidewalls of the gate pattern are formed, and sourcedrain regions are formed by injecting impurity ions into the semiconductor substrate using the spacers and the gate pattern as ion injection masks.