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Spectrum extraction plays a crucial role in two-dimensional spectrum data processing. One of the most important spectrum extraction methods is profile fitting algorithm. In this article we studied the spectrum profile fitting method of non-Gaussian model. The general solution methods always have poor adaptability and some limitation, in order to approximate spectral profiles better, we introduced...
To avoid the problems caused by complex sea conditions, like high costs, ships passive movement could not be controlled that brought by the ship experiment, in this paper, a simulated ship motion model system is developed to resolve this problem, which improved the reusability and reduced the actual cost. Six degrees of freedom movement mathematical model and sea state interference model are established...
This article proposes a novel data model for text corpora and discusses the issues on corpus query. First, a formalized definition of the corpus data is presented. Second, a data model is proposed in terms of the relational model, which is also proved to be complete. On this basis, we extend the query semantics of the traditional corpus query that generates KWIC (Keyword in Context) concordances and...
Large scale three-dimensional spatial data of underground and aboveground entity has features of different shapes, uneven spatial distribution and complicated spatial relationships. At present, the single spatial index structure can not satisfy the large scale three-dimensional spatial data organization and management. Especially for the index of the elements with information retrieval LOD, its efficiency...
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