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In this paper, taking into account the reality of the nonlinear system, we introduced nonlinear item into Unbiased model GM(1,1) and then deduce its Logistic expression. Based on the expression, we analyzed the steady state, periodic state and chaotic characteristics of Unbiased model GM(1,1). Finally, the superiority of Unbiased model GM(1,1) are well explained with chaos theory.
Since China's accession to WTO at the end of 2001, its trade in services has developed rapidly. Services in trade will definitely become the trend of international trades. By statistics from 2002 to 2007, this paper studied influencing factors of China's trade in services. By establishing the grey incidence analysis model, the paper studied the degree of incidence between two sequences of system's...
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