Methods and apparatuses to hierarchically retime a circuit. Each sensor has a multiplicity of light-receiving elements that are configured to take a pixel picture of the monitored space, and a control unit identifies an object in the monitored space from video data of the pixel picture. The metal article has macroscopically smooth surface portions and a plurality of multiply curved nanopores in the region of at least one surface portion. The source of the NMOS transistor can be connected to ground. Drive diagnosis is carried out by comparing distribution of the short-duration data and distribution of the intermediate-duration data.