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Bass model have been used widely for diffusion curve of a new product in some countries of the world, but only a few studies have explored in the parameters' estimation of bass model. In this paper, Bass model is adopted to fit the diffusion curve of mobile subscribers of China with different parameter-estimation techniques respectively, such as NLS(Non-Linear Least Squares ) ,OLS(Ordinary Least Squares),...
Rail high-speed passenger lines (HSPL) have been developed rapidly in China; however, the traditional rail crew scheduling mode called responsible mode, in which crews are bundled with vehicles, is hard to adapt to the transit characteristic of HSPL. Moreover, the utilization of rail crew resources is commonly inefficient and the scheduling methods are generally behindhand. To reduce the pressure...
In this paper, we consider fuzzy variable weight combining forecasting which based on optimal combining forecasting and integrate those two modeling methods. Studies show that: optimal combining forecasting combines forecasting methods in a period of time and makes forecast through fixing the weight of forecasting methods that in the combination. But it does not consider that the weight will vary...
Telecom broadband is a main channel supporting internet surfing in China. With the market competition development, customer churn management has become a kernel task of marketing for telecommunication operators. The traditional market research methods are difficult to support the challenge of churn. Data mining techniques are applied to the customer churn management, to establish an early-warning...
Considering the current situation of the data on oil and gas resources in China, which is relatively multi-sourced, heterogeneous and decentralized, as well as the actual demand of OLAP, MVC model is employed as the system constructing model. Besides, ODBC and XML technology are combined to achieve dynamic mapping on database connection. Thus the National Petroleum Resource Database ETL System which...
Itpsilas a key problem for each country to balance and choose among money supply, inflation and economic growth. A DAG model can place restrictions on over recognitions of the innotion terms in a structural VAR model constituted by macroeconomic variables and can show the corresponding period and dynamic causality of economic variables at the same time. Using DAG model this paper finds that monetary...
Aiming at the insufficiencies of traditional agricultural land grading methods, this study discussed the process and technical route of agricultural land grading based on decision tree analysis method and GIS, constructed an agricultural land grading model based on MATLAB and decision tree C4.5 algorithm. Furthermore, we took Luanwan village of Pingyin county in China for the empirical study, selected...
Analysis on Image Characteristic is a key step to understand and make good use of remote sensing image. Data models were employed to analyze for image quality of the Chinese-Brazil Earth Resources Satellite (CBERS-2) and LANDSAT/TM in Li-jiang region, Yunnan province. They include normalized model, univariate image statistics model, the ratio of inner and mutual variance model and spatial resolution...
Based on the statistical data during the period from 2003 to 2008 released by Henan Statistical Bureau in China, this paper focused on forecasting the amount of the scientists and technicians of Henan province in China, using GM (1, 1) model and regression model. The result of this empirical study is that the grey prediction theory can fit the scientists and technicians amount development precisely...
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