A high rotational speed vacuum pump includes a compressor, a drive motor for driving said compressor, and a motor control unit for operating said drive motor at a constant nominal rotational frequency. In particular, the present invention provides novel inhibitors of HIV replication, pharmaceutical compositions containing such compounds and methods for using these compounds in the treatment of HIV infection. The system also provides a means to assess the level of skill that the student has acquired. The media gateway under the control of the iMSC converts the air interface media flow into a packet stream that is managed by SIP procedures within the IMS. The masked bits of the compound bit mask are applied to root node bit tables, one for each bit mask of the compound bit mask. The elongated member is coupled to the retaining structure and enables insertion of the retaining structure with the stent into the body such that the stent can be deployed from the retaining structure and placed into the body while maintaining substantially its initial length.