Techniques, systems, and articles of manufacture for reducing switch state size in flow-based networks. A plurality of sensor IC chips for detecting the light traveling from an image reading region are mounted on the substrate. IPv6 packets to be transmitted between an IPv6 access point and an IPv6 destination node through a IPv4 communications network are encapsulated in IPv4 packets for transmission through the IPv4 communications network. Corresponding channels are estimated for the first subset of antennas and the second subset of antennas from the user data and the pilot tones. The polycarbonate nanocomposites have improved physical and mechanical properties.