The present invention provides a catalyst system and a process for stereoselectively inverting a chiral center of a chemical compound. More particularly, methods and methods are disclosed for detecting the preamble and symbol boundaries of received data packets encoded with OFDM and other multi-carrier symbol transmission systems. The reception device includes a first buffer which stores the VLAN traffic received from the first line and a second buffer which stores the VLAN traffic received from the second line. In addition, the production system transmits to the user the customized production with the inserted advertisements and promotional material embedded therein. The seams are arranged so as to surround the cells or recesses in the sheets, and the cells or recesses are filled with a shock attenuating material. With respect to a duty ratio of the alternating current bias of a polarity with which the toner is moved from the developer bearing member to the toner bearing member, a second duty ratio that is a duty ratio of the collection bias is set to be smaller than a first duty ratio that is a duty ratio of the development bias.