A method and system for mapping network attacks onto a strategy game is presented. Each unit cell 10 includes a back-gate region 12 formed in the semiconductor substrate and a source region 14 formed in the semiconductor substrate so as to adjacently surround the back-gate region 12 in a plan-view. A main beam M incident area is divided with a boundary defined by the first parting line. The shield assembly also includes a plurality of arms articulated to one another to permit sliding movement of the safety shield along the needle cannula from a proximal position to a distal position where the tip of the needle cannula is shielded.