A computer program is provided for synchronizing at least a first and a second database. A pair of like aperture-forming elements are arranged in a reciprocal fashion to form an aperture to contain a fiber optic bundle. Each elliptical movement unit includes a swing bar and a pedal carrier. The locking member is adapted for be pivotably received in the cover unit. The communication channel is organized into superframes, such that each superframe includes a contention-free period and a contention-period. On the surface of the lower electrode 2 are formed PZT and an upper electrode 4.