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In the early period of Yi Dynasty of Korea, currency and physical transactions were parallel, and the market order was chaotic. During the reign of Emperor Taejong, the Banknote Law was established and carried out, and measures such as replacing physical objects with paper money, establishing joint purchase houses and determining the crime of hiding cloth were adopted to enhance currency credit. Although the law promoted circulation, monetary reform was not smooth. In this study, based on the economic historical data of the dynasty and the game theory method, the author find that the Yi Dynasty tries to improve the relationship between the state and the grassroots society and explore new economic policies through national finance and monetary reform. The failure of monetary reform is not only a policy failure, but also a consequence of uneven distribution of interests among different subjects. [ABSTRACT FROM AUTHOR]

To improve the accuracy of defect detection in bank note sorting and decrease the effects of cracks and scratches of bank note on detecting, a new algorithm based on wavelet decomposition is proposed, in which affine transform and wavelet transform are applied to bank note image registration and the edge information is extracted by Kirsch operator, while the defect feature is extracted from edge intensity differential. The bank note image is divided into several fixed size subzones, in each of which the defect feature is calculated to judge the degree of contamination. The experimental results reveal that the proposed feature extraction method is robust to the gray intensity change in each subbone, and obtains high recognition rate and high stability. This method has already been used in practical bank note sorting system. [ABSTRACT FROM AUTHOR]