A method for multicast load balancing in a wireless network having a plurality of access points. A raw light guide plate having a light input surface and a light output surface is provided. Meanwhile, both sides of the first shaft are constructed as a correspondingly symmetric U-shaped treadle rod relative to the shaft which a treadle pad is rotatably received for treading movement in alternating succession. In another embodiment, the invention discloses pharmaceutical compositions comprising such cyclic amines as well as methods of using them to treat obesity and other histamine H3 receptor-related diseases.