Utilizing the characteristics of signal flow graph, for the three quantization methods of truncation, rounding and convergent rounding, the exact upper bound and lower bound of mean square error are obtained for the two FFT algorithms of fixed point and block floating point.

For a small open economy with capital intensity below its steady-state level,labor outmigration directly contributes to faster income convergence but also creates a disincentive for gross capital investment.

This paper sets up a neoclassical model to study the technology diffusion and income convergence.

Researches are focused on rounding methods for high-speed floating-point multipliers in the paper,and a kind of fast rounding method based on the prediction and selection is presented.

By using the method, the partial decoded barrel shifter is of functions of alignment shifter with additional bits for rounding and general shifter.

By using this method, complementing and rounding are combined and processed in parallel, so that the critical path is 15 gate delays less than common circuit structure, and the circuit scale is decreased.

The relation between the ordered Series of {an} and {a1+a2+…+an/n} has been explored,so does the constringency of the two ordered series of Numbers.

Elaborate a basic theory of calculating group of linear equation by iteration method, reforming Jacobi iteration method, raising constringency rate.