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In practical chemical plants, melt index (MI) can only be measured by off-line analysis which cost 2–4 hours. So it is important to develop online analyzers using process data especially when the mechanism is complex. A novel data based soft-sensing method is proposed for MI estimating in propylene polymerization process. This approach is constructed under just-in-time modeling scheme, in which historical...
The model of EPC has been used in our construction industry for 20 years. In the bidding of the practical EPC, the prequalification is usually realized by the traditional procedure and method, which need complicated calculation and implementation process. On the basic process of EPC prequalification tender, this article develops the system of prequalification tender by means of Excel VBA, determines...
This article proposed a nonparametric test method by using Gaussian mixture model application idea for reference to evaluating the construction of index architecture. First use Gaussian mixture model to cluster analysis the index architecture. Second use rank correlation coefficient of nonparametric test method to select index architecture. Then determined the evaluate index architecture and guarantee...
The self-index is a kind of highly compressed, self-contained full-text index. It is designed for indexing plain texts in order to reduce its permanent storage, as well as to enhance searching performance. Apart from being a sequence of characters, usually the text has specific internal structure. The data record, as a basic model of structured data, is therefore employed to represent and organize...
With the development of networks and database, the rapid growth of information and data, data files pose a challenge to information retrieval. Compression technology archived the query in the compressed state. Compression enquiries index FM-index is an advanced algorithm in the field, but FM-index must consume great memory in process of construct index. The overlapping block FM-index in occupation...
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