An object is to provide graphene which has high conductivity and is permeable to ions of lithium or the like. The sensing component is adapted to detect information on the presence of a detachable secondary end in an especially reliable manner. A foreground image generator generates foreground image in binary representation so that a first encoder performs MMR encoding on the foreground image. The two-part piston rod may include an outer part having a helical thread of a second lead and an inner part having a helical thread of a third lead. Thus, according to the presently disclosed embodiments, paging areas reconfigure themselves according to changes in movement traffic of mobile hosts.