Opinion Evolution In Open Community

We consider a dynamic group composed with a constant number of people and the people will change periodically. Every member in the community owns a value of confidence - a mechanism that measures the agent's coherence to his or her own attitude. Based on Cellular Automata, the opinions of all agents are synchronously updated. As long as the updating frequency and updating proportion are appropriate, the open system can reach a democracy-like steady state. The majority of agents in the community will hold the same opinion.