A method of manufacturing a semiconductor device in which a thin film is formed on a semiconductor substrate using a reaction gas described in the present invention as active species is disclosed, where a film formation process is subdivided into multiple stages and a film is formed by varying the gas pressure or the gas flow speed of the active species within a reaction chamber for each stage. The optical fiber is coupled to the bearing in such a way that at least a part of the optical fiber that comprises Bragg grating is curved. The DRAM memory buffer controller is coupled through a memory bus to a plurality of a dynamic random access memory modules and a flash memory module, which are at the same hierarchical level from the processor. Weakened lines of substrate may be provided to define removable portions on the top printable substrate. In this way, the HOL blocking issue is addressed, without the need for a significantly increased number of output queues. The retrieved policies are associated with the user and the groups associated with that user.