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A new data stream outlier detection algorithm SODRNN is proposed based on reverse nearest neighbors. We deal with the sliding window model, where outlier queries are performed in order to detect anomalies in the current window. The update of insertion or deletion only needs one scan of the current window, which improves efficiency. The capability of queries(More)
This article introduced the text excavation's research condition, has analyzed the text excavation basic concept and the technology, summarized the text excavation process, the commonly used algorithm, the text classification, the text cluster, the connection analysis, the tendency forecast and so on, pointed out that the algorithm the insufficiency, has(More)
—In this paper, we give a new algorithm evolving from Atallah's algorithm proposed in 1984, and we make many improvements: First of all, combining replaced sewing in order to simplify the third step; Secondly, we delete the fourth step. And we simplify the construction of the auxiliary graph, avoiding the second time to find Euler tour and the introduction(More)
On the basis of analyzing the basic concepts and the process of text excavation, the present study proposes some new methods in extraction of text features, deflation of characteristic collection, extraction of study and knowledge pattern, and appraisal of model quality. Meanwhile, it makes a comparison of two types of text categorization, text(More)
As a new kind of consumption mode, the online group buying is familiar to consumers and many consumers adopt this new consumption mode. We can conclude online consumption as one of the electronic commerce. Electronic commerce is known as utilization of computer technique, network technique and telecommunication technique to achieve the entire electronic(More)
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