Migration Decision Under Resource-Constrained And Dynamics Of The Opinion

Human behavior is complex, and the complex of collective behaviors comes from interactions between individuals. They combine with their own attributes and make different decisions. It can lead to emergent phenomena of collective behaviors. Understanding the complexity of the internal mechanism is the main research topic of complex system theory.As a typical social phenomenon of group decision behavior, population migration is a focus of the complex system. Human group decision behavior ruled by some natural factors is not yet paid enough attention. With pull and push theory, two models are proposed in this paper. The models are conditioned by natural factors which including food production are constant and fluctuations. The influences include agricultural development level, quantity of immigration areas and migratory distance. The trends of changes in population and food production per capita of immigration areas are discussed, and the changes of population distribution is analysed by using information entropy. The result shows that information entropy has the rule of first rose then descended, which means population migration has experienced a transition from disorder to order. By combining the population pattern and the state relation graph, the results further shows the direct cause of entropy reduction comes from rationally recurrent migration.Opinion formation is the result of co-evolution of individual factors and environmental factors. In this thesis, a model of individual cognitive behavior which is influenced by multi force field is proposed on a whole social network. Considering the differences in level of individual cognition and environment effects, the model shows a process of individual cognitive behavior under different weights between strength force of own and strength force of environment. The result shows that it is good to develop new things when the impact of their own plays a major role; on the contrary, individual will be affected by group psychology, and public opinion is crucial to opinion formation. Changes of information entropy in two weights of individual cognitive behavior show a trend decay in an approximate exponent manner, further show it is good for group opinion reach an agreement when individual as the dominant factor.