In one embodiment, a user of a social networking system requests to look up a contact’s communication channel information in the user’s address book. The control circuit receives a measurement instruction through the instruction input unit to control the charging circuit to charge the capacitor, and receives a stop charging signal from the charging circuit when a voltage of the capacitor reaches a saturation voltage for controlling the charging circuit to stop charging the capacitor. The reset circuit may be configured to reset the counter stage to a predetermined state without changing the state of the flip-flop signal. Each tensile strand has at least one end secured in fixed position relative to a peripheral region of the sole structure. The invention also provides a system comprising the delivery catheter of the invention and an ablation device having an ablation probe, wherein the delivery catheter and the ablation probe are configured to allow the ablation probe to be mounted at the distal end of the delivery catheter. The test structure and related methods are applicable within the context of three-dimensional integrated circuits.