A method, a device, and a system for controlling tunnel identifier allocation are provided. The informational article includes a substrate having a zone for inserting information and a refractive image disposed within the zone. The first and the second comparators generate a corner code based on comparison results. The second sensor is capable of sensing activity of a heart ventricle. Moreover, users can requested a postponed access, wherein the resource or service they are requesting is stored to a server, and available to the user at a later time. The phase shifter and related load device are capable of mitigating effects resulted from varactor’s non-linear C-V curve.