A fin field-effect transistor has a substrate and a fin structure above the substrate, as well as a drain region and a source region outside the fin structure above the substrate. The request logging component stores the formulated query as an unsatisfied request. The control circuit 10 comprises a comparator 11 and a timer circuit 12. Based on the status of the print heads, a controller selectively groups different individual transport elements together to act in unison for the motion control. In some embodiments, the fixture is a luminaire. A failure detector detects whether a failure occurs in each of the first and second measuring units.