A method for determining the temperature or the ohmic resistance of an electrical component, especially of a coil of a magnetic valve. Further, a standby circuit is formed of a few elements, and thus increase in the circuit area of the semiconductor device is prevented. In the signal processing device, a storage stores observed data of the plurality of the observed signals. In the tracks at the base and the upper cover are tool heads having distinct styles, and the tool heads are accommodated by springs. A passivation layer is formed by depositing a second insulating material over the substrate, the source bus line, the source electrode, the drain electrode, and the source pad, and patterning the passivation layer to expose a second portion of the gate pad and the gate pad protecting layer. The disclosed artificial dura mater shows good biocompatibility, enhances dural tissue regeneration, achieves excellent repairing effects, prevents adhesion, allows complete absorption, has good mechanical properties, ensures low infection rates, and can be loaded with therapeutic agents.