To provide the fuel cell system, which can prevents the imperfect combustion of the fuel gas in combustor caused by shortage of the air exhausted from the fuel cell so that the harmful components is not contained in the exhausted gas, and can prevents the decreasing of the cell voltage by enabling drainage of the produced water from fuel cell certainly. Thus, even in an image process is performed to a larger number of gradations, a high-speed process can be achieved with simple structure, and the error diffusion process can be effectively performed to a shift of dot apply positions. The method includes receiving a signal indicative of a real-time determination of type of an apnea event for a patient during the apnea event, and using the signal to select appropriate therapy to be applied to the patient during the apnea event to treat the apnea event, and to withhold inappropriate therapy. The cooling method can be aided by a heat exchanger operatively communicating with the turbomachine. Where the first conference is not currently being facilitated on any of the plurality of media servers, creation of the first conference on a second one of the plurality of media servers is triggered, and the first client is dispatched to the first conference on the second media server. Also disclosed are the terminal functionalized polyisobuyl N-substituted pyrrole compounds where the polyisobutyl group is substituted at the 2 and 3 position of the N-substituted pyrrole.