Two dynamic grey models DGM (1, 1) for the verification cycle and the lifecycle of measuring instrument based on time sequence and frequency sequence were set up, according to the statistical feature of examination da...Two dynamic grey models DGM (1, 1) for the verification cycle and the lifecycle of measuring instrument based on time sequence and frequency sequence were set up, according to the statistical feature of examination data and weighting method. By a specific case, i.e. vernier caliper, it is proved that the fit precision and forecast precision of the models are much higher, the cycles are obviously different under different working conditions, and the forecast result of the frequency sequence model is better than that of the time sequence model. Combining dynamic grey model and auto-manufacturing case the controlling and information subsystems of verification cycle and the lifecycle based on information integration, multi-sensor controlling and management controlling were given. The models can be used in production process to help enterprise reduce error, cost and flaw.展开更多
Computer chip is always accompanied by the increase of heat dissipation and miniaturization. The miniature heat pipes are widely used in notebook computer to resolve the heat dissipation problems. Maximum heat removed...Computer chip is always accompanied by the increase of heat dissipation and miniaturization. The miniature heat pipes are widely used in notebook computer to resolve the heat dissipation problems. Maximum heat removed model of miniature heat pipes building by grey model is presented. In order to know the foundation for modeling, the smooth grade of error examination is inquired and the accuracy of grey relational grade is verified. The model can be used to select a suitable heat pipes to solve electric heat problems in the future. Final results show that the grey model only needs four experiment data and its error value is less than 10%, further, it is better than computational fluid dynamics （CFD） model.展开更多
By establishing grey dynamic model and adopting its method, this essay makes forecast and comparison on the developing trend in track and field sports of Asia and the world. To higher the model’s precise, some sequen...By establishing grey dynamic model and adopting its method, this essay makes forecast and comparison on the developing trend in track and field sports of Asia and the world. To higher the model’s precise, some sequential data are processed by slide mean value, a Maclourin Exponsion is made to some exponents of less adaptable response function and acceptance or rejection is made according to the fitting mode of the number series and their development. In the quatitative analysis, the first locus of the developing coefficient of the model in the sports field is the main basis. The analysis indicates that women’s and men’s field sports in Asia are developing respectively much faster, a little faster than that of the world, but men’s track sports in Asia are progressing paralled to that of the world, and women’s track in Asia remains behind.展开更多
文摘Two dynamic grey models DGM (1, 1) for the verification cycle and the lifecycle of measuring instrument based on time sequence and frequency sequence were set up, according to the statistical feature of examination data and weighting method. By a specific case, i.e. vernier caliper, it is proved that the fit precision and forecast precision of the models are much higher, the cycles are obviously different under different working conditions, and the forecast result of the frequency sequence model is better than that of the time sequence model. Combining dynamic grey model and auto-manufacturing case the controlling and information subsystems of verification cycle and the lifecycle based on information integration, multi-sensor controlling and management controlling were given. The models can be used in production process to help enterprise reduce error, cost and flaw.
文摘Computer chip is always accompanied by the increase of heat dissipation and miniaturization. The miniature heat pipes are widely used in notebook computer to resolve the heat dissipation problems. Maximum heat removed model of miniature heat pipes building by grey model is presented. In order to know the foundation for modeling, the smooth grade of error examination is inquired and the accuracy of grey relational grade is verified. The model can be used to select a suitable heat pipes to solve electric heat problems in the future. Final results show that the grey model only needs four experiment data and its error value is less than 10%, further, it is better than computational fluid dynamics （CFD） model.
基金This work is supported by the National Natural Foundation of China.
文摘By establishing grey dynamic model and adopting its method, this essay makes forecast and comparison on the developing trend in track and field sports of Asia and the world. To higher the model’s precise, some sequential data are processed by slide mean value, a Maclourin Exponsion is made to some exponents of less adaptable response function and acceptance or rejection is made according to the fitting mode of the number series and their development. In the quatitative analysis, the first locus of the developing coefficient of the model in the sports field is the main basis. The analysis indicates that women’s and men’s field sports in Asia are developing respectively much faster, a little faster than that of the world, but men’s track sports in Asia are progressing paralled to that of the world, and women’s track in Asia remains behind.
