The exemplary embodiments provide a resilient integrated circuit. The piperidine derivatives include compounds of formula :wherein RA, AB, n, R3, R2 and R4 are defined herein. The server is configured for detecting any backlogged synchronous flow, and when the server visits any said backlogged synchronous flow, it allows the backlogged synchronous flow to utilize the resource for a given time, whereby the synchronous flows have a guaranteed transmission window on each round. The wave generating device is arranged to generate acoustic waves so as to induce optical band gas in the polariton spectrum, thereby affecting the transmission of the light passing through the waveguide, the transmission of which is thereby affected. This allows implementation of a chip coil and a printed circuit board for the same that allow reduction in magnetic loss.