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This paper in order to systematically describe the project cost forecasting system. We introduced the index value of membership degree and the closeness degree calculation and used exponential smoothing method to establish cost pricing model. Finally, an example was applied to verify the model.
Regional forest resource has multi attributes of global and local public good. Based on the empirical research from relative available data in China and the General Linear Mixed-effects Models, this paper finds the regional forest resource has a significant effect on the life expectancy. So the government, whose objective function is to maximize the resident social welfare, should bring the policy...
In this paper, we present a spatial version of the Holling-type II predation-diffusion model which contains some important factors, constant harvest rate on prey, noise on predator. From the numerical results, we know that noise can induce instability and enhance the oscillation of the species density. Our results show that the noise and harvest play a prominent role in the predation-diffusion model.
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