In an overlapping generations model, there are two monetary regimes to be selected for the government:(1)"constant real deficit" regime, that is, the government decides a constant real deficit and maintain that real deficit by adjusting the supply of money;(2)"fixed growth rate of money" regime, that is, the government decides a fixed growth rate of money and maintain it by adjusting seignorage.

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The precision lapping technology to machine the copper substrate using semi-fixed abrasive plate was studied. The surface roughness and material removal rate as the evaluation of indicators, the influences of the different lapping parameters on the surface roughness and material removal rate were discussed and analyzed. Experimental results indicated that the copper substrate could be efficiently machined by semi-fixed abrasive plate of 800(superscript #) SiC abrasive, and the initial roughness Ra of a machined surface could be improved from 0.553μm to 0.28μm in 10min, produced an ideal rarely scratch surface. Then processed copper polished by diamonded grinding paste, it could be satisfied for the Ni-Pd-P alloy thin film growth.

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To put up founding and test experiments in these two ways separately, the first model use fixed training data to train the network and it constringed at the ninety circles, it's test identifying rate is eighty eight percent;the second model use the same fixed training data to train the network and it constringed at the sixty circles, it's test identifying rate is ninety nine percento Thus shows that the model with the switched character data is more better in identifying rate and it' s training time is shorter than the model used the character data directly,, Use BP Neural Network to forecast the Medicine Production quality is a better method..

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As to domestic sector, the author discuss the influences of different exchange rate regime on growth, inflation, economic stability and financial deepening, and agues that:(1) the relatively fixed exhange rate regimes are more pro-growth for emerging economies;(2) the relatively fixed exchange rate regimes can be useful for control of inflation in developing countries, but it can also be replaced by other monetary rules like inflaiton-targeting;(3) fixed exchange rate regime woulde better to deal with nominal shocks when floating exchange rate regime better to deal with real shocks, but both of them can not entirely insulate the external shocks;(4) the improvement of financial deepening is faster under relative fixed exchange rate regimes.

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This paper includes several parts: first, some important concepts of the thesis have been defined, a theoretical overview of currency crisis has been finished; then, we have described the history of the international monetary system; later, three chapes have been arranged to discuss the mechanism of currency crisis under fixed and floating and intermediate exchange rate system respectively. The part of the fixed exchange rate system mainly includes the analysis of the collapse of the international gold standard system, the Bretton Woods system and the the European Monetary System; in the part of the floating exchange rate system, the volatility problem under freely floating exchange rate system has been studied; the part of the intermediate exchange rate system mainly includes the analysis of currency crises in regional dollar standard system and the currency board system. And finally, we have analysed the inevitability of the appearance of new type regional monetary cooperation patterns, and how these cooperations avoid currency crises.

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One hand, under floating exchange rate system the stability of the prevalence of non-speculative, while the fixed exchange rate system with the general stability of speculation because the speculators will be expected to exchange rate adjustment to a fixed level, and the Government's intervention in the market traders of the psychological there are "nominal anchor" role in creating a more stable economic environment.

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So floating rates do do monetary policy abundance potent than a fixed rate system.

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