In this article, the expected discounted penalty function Фδ,α (u) with constant interest δ and "discounted factor" exp(-αTδ) is considered. As a result,
In order to improve production and operation ability of medium and small-sized enterprises, an assessment-index system of production and operation ability was p
For effectively early warning the marketing risk caused along with the varied environment, a BP neural network method was introduced on the basis of analyzing t
This paper discussed the adaptability of the alfalfa and ryegrass to the new artificial soil that was composed of fly ash and furfural residue. The potted exper