A light-emitting device and the method for making the same are disclosed. The cross bars can be easily removable and replaceable or can be adjustable along a length of the rack system. a different incentive is provided for the different pricing and choice combinations, in an effort to maximize sales for the promoted item, and the different incentives are stored in an incentive matrix accessed by product purchased and by consumer profile as determined from whether the consumer bought the more expensive item, the less expensive item, or one of two equally priced items. The process may further include clustering the sections based at least in part on a similarity of the distribution of functions between each of the sections to obtain functional groups, estimating a functionality intensity for each of the functional groups, and annotating each of the functional groups. An operation of a Base Station includes performing feedback channel detection for a terminal classified as a low speed mode, and, if the feedback channel detection fails continuously by the predefined number of times, and a frequency offset estimation result using a pilot signal exceeds a threshold value, classifying the terminal as a high speed mode. A method is provided for practicing the system.