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Dynamometer cards are commonly used to analyze down-hole conditions of beam pumping units in practical oil production. In the literature, supervised learning based methods heavily rely on training samples. In order to realize unsupervised learning of fault diagnosis for down-hole conditions, a method based on an improved fuzzy Iterative Self-Organizing Data Analysis Technique (ISODATA) with “merging”...
As efficient methods of reducing the investment risks, the real estate portfolio optimization methods and models have some defects. The information entropy was used as the risk measuring index, and a self-adaptive ant algorithm with a changing index was proposed to overcome the deficiency of the basic ant algorithm. Then the improved algorithm was introduced into the real estate portfolio. And the...
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