A liquid crystal on silicon device comprises a mirror layer comprising a plurality of mirror electrodes, a passivation layer formed on the surface of the mirror layer comprising a plurality of openings to the mirror electrodes, and a liquid crystal layer being arranged on top of the alignment layer. The method of performing handover in a mobile node includes determining an intrinsic value of a current PoA to which the mobile node is connected; and performing handover using the determined intrinsic value. The LUT is populated differently for cells within the spectrum locus and for those outside the spectrum locus. In accessing the plurality of memory cells row by row, the control circuit raises the voltage of the power supply line and, after the voltage of the power supply line reaches the high voltage at all the positions, starts activation of the word line. The multi-purpose vacuum suction apparatus includes an elastic member for returning one or more operating members to the original positions thereof, and a vacuum suction plate unit having a multi-purpose connector, wherein an ornamental member for use in various ornamentation or advertisement can be fitted into or assembled with the top end of the multi-purpose connector.