A technique for archiving a relational database having tables of rows may use clusters. The analogdigital conversion and detection circuit is connected to an LED based load to detect a forward voltage thereof and converts the forward voltage into an output of digital signal. Further, information continues to be distributed among the NCPs even if a break occurs in a segment of fiber in the network. The smoothed voltages are supplied between output terminals. After the dielectric-constant-enhanced thin film has been deposited, the heat treatment procedure will be proceed to diminish the leakage current greatly, when it is used in a capacitor.