A data signal for modifying a graphic scene displayed on at least one terminal, the graphic scene mode of a set of graphic objects and each object defined by at least one field. The gain cell includes a vertical MOS transistor having a source region, a drain region, and a floating body region therebetween. A plurality of light emitting modules may be ganged together in series, parallel or series-parallel electrical configurations to produce chains of light emitting modules. A method for estimating the number of mobile sensors required to cover a region of interest also is disclosed. Finally, it is determined how long to cut a third connecting pipe with reference to the extended length of the pipe fitting apparatus.