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This paper proposed an unconstrainted optimization method based on BP neural network, and take Unipolar Sigmoid function as the transfer function,and take maximize network output as example,derived and given the partial derivatives of the BP neural network's output to input.On this basis, give a general mathematical expression that based on the BP neural network unconstrainted optimization issues,and...
The paper makes further research on estimating the parameters of the asymmetrical model describing effect of nutrient base on present literature, and provides a new method for estimating parameters that this method combines one-dimension search of optimization theory and multiple linear regression. The method not only overcomes the faultiness of estimation methods in existing literature, but also...
This paper makes further research on BP neural network algorithm on the basis of the existing literature. It pointed out the problems in the inherent algorithm, as well as the causes were presented. This research also proposed the BP neural network was difficult to achieve the desired effect when applied to solve the forecasting problems, and then the reasons of that were analyzed, and this point...
There is now considerable concern for foodservice industry about the problem of supplier selection in the background of supply chain management. A supplier selection index system based on chain catering industry was developed, and the relevance between indexes were reduced through factor analysis. Suppliers can be analyzed with the decision making model. Further more, to achieve the dynamic selection...
Soil moisture is one of the most important factors which affect crop yields directly. In recent years, although upland field area increased not too much, agricultural water resources utilization increased which has led to a waste of water resources in Sanjiang Plain. In order to solve the above problem, wavelet de-noising theory and time series analysis are adopted to analyze measured data of soil...
The study constructed the basic frame of decision support system for fertilization. According to the nutrient content of soil on the different soil sampling points and the yield meteorological data and soil data into a database. The system could interpolate soil properties map by the comprehensive evaluation system of soil fertility. Based on the database system and knowledge system, the system can...
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