A collapsible chair includes a frame having two sidepieces, each having a base portion and a back portion. According to the method, the load is placed upon a frame structure with a substantially horizontal extension. The underlayer may be a hexagonal boron-nitride layer, and the sensor may include a seed layer to facilitate the growth of the h-BN underlayer. A schedule that determines execution timing of a control command of the RW that performs a data readwrite operation on the RF tags in accordance with the detected RF tags is created.