Today, individuals＇ attitudes towards retirement and old age have changed with the increase of life expectancy and healthy and active years after retirement, rise in purchasing power, and mobility opportunities. As a...Today, individuals＇ attitudes towards retirement and old age have changed with the increase of life expectancy and healthy and active years after retirement, rise in purchasing power, and mobility opportunities. As a result of this change, the rate of post-retirement migration, settling into a new life in a new region after retirement, has considerably increased. However, despite of this increase, post-retirement migration is one of the least analyzed migration movements among existing studies. Hence, in this article, studies analyzing properties of post-retirement migration and factors causing this migration are assessed. As every migration movement, post-migration movements also create changes laying different responsibilities on both emigrant and immigrant regions and migrating person and require settling into a new life in the place of arrival. In the relevant studies, the basic reason for post-retirement migration is considered as pursuit of peace and joy and it is defined as a migration type under the high influence of counter-urbanization movement. According to the results of the study, it is stated that post-retirement migrants, unlike many international migrants, can buy their own houses in the countries of arrival and can maintain a relatively high standard of living compared to that local community, and that this situation is a very attractive factor encouraging them to migrate. Moreover in the studies, characteristics causing migration and belonging to the region of departure are analyzed as aversive while characteristics belonging to the region of arrival are analyzed as attractive factors.展开更多
Chatterjee considered a predator prey model with avian migration in the migration prey population IS. Chatterjee, Alternative prey source coupled with prey recovery enhance stability between migratory prey and their p...Chatterjee considered a predator prey model with avian migration in the migration prey population IS. Chatterjee, Alternative prey source coupled with prey recovery enhance stability between migratory prey and their predator in the presence of disease, Nonlinear Anal. Real World Appl. 11 （2010） 4415-4430]. In this paper, we modify and analyze the model by taking time dependent parameters and the general flmctional response into consideration. The conditions for the persistence of the system and the extinction of the disease are obtained. The global attractivity of the system is also studied. By numerical simulations, we find that the qualitative behavior of the system independent on the choice of the functional response. Moreover, it is observed that the infection rate, recruitment rate and the predation rate play a vital role in predicting the behavior of the dynamics.展开更多
文摘Today, individuals＇ attitudes towards retirement and old age have changed with the increase of life expectancy and healthy and active years after retirement, rise in purchasing power, and mobility opportunities. As a result of this change, the rate of post-retirement migration, settling into a new life in a new region after retirement, has considerably increased. However, despite of this increase, post-retirement migration is one of the least analyzed migration movements among existing studies. Hence, in this article, studies analyzing properties of post-retirement migration and factors causing this migration are assessed. As every migration movement, post-migration movements also create changes laying different responsibilities on both emigrant and immigrant regions and migrating person and require settling into a new life in the place of arrival. In the relevant studies, the basic reason for post-retirement migration is considered as pursuit of peace and joy and it is defined as a migration type under the high influence of counter-urbanization movement. According to the results of the study, it is stated that post-retirement migrants, unlike many international migrants, can buy their own houses in the countries of arrival and can maintain a relatively high standard of living compared to that local community, and that this situation is a very attractive factor encouraging them to migrate. Moreover in the studies, characteristics causing migration and belonging to the region of departure are analyzed as aversive while characteristics belonging to the region of arrival are analyzed as attractive factors.
文摘Chatterjee considered a predator prey model with avian migration in the migration prey population IS. Chatterjee, Alternative prey source coupled with prey recovery enhance stability between migratory prey and their predator in the presence of disease, Nonlinear Anal. Real World Appl. 11 （2010） 4415-4430]. In this paper, we modify and analyze the model by taking time dependent parameters and the general flmctional response into consideration. The conditions for the persistence of the system and the extinction of the disease are obtained. The global attractivity of the system is also studied. By numerical simulations, we find that the qualitative behavior of the system independent on the choice of the functional response. Moreover, it is observed that the infection rate, recruitment rate and the predation rate play a vital role in predicting the behavior of the dynamics.
