The present invention provides an apparatus having a microphone, an analog to digital converting circuit, a semiconductor memory, input device, and a controller. In one embodiment, the oral device includes an intraoral portion, an extraoral portion, and an auxiliary support device that serves to stabilize the oral device. A first bid is selected as the auction winner and a ratio is computed as the first bid plus a spread to the second highest bid. Each policy can be associated with a group of target nodes in which the group of target nodes share a common relationship. The process comprises adding the biocide to the dispersion phase.