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The categorization of a Web user query by topic or category can be used to select useful Web sources that contain the required information. In pursuit of this goal, we explore methods for mapping user queries to category hierarchies under which deep Web resources are also assumed to be classified. Our sources for these category hierarchies, or directories, are Yahoo! Directory and Wikipedia. Forwarding...
Bitmap indices have been widely used in scientific applications and commercial systems for processing complex, multi-dimensional queries where traditional tree-based indices would not work efficiently. A common approach for reducing the size of a bitmap index for high cardinality attributes is to group ranges of values of an attribute into bins and then build a bitmap for each bin rather than a bitmap...
Large scale scientific data is often stored in scientific data formats such as FITS, netCDF and HDF. These storage formats are of particular interest to the scientific user community since they provide multi-dimensional storage and retrieval. However, one of the drawbacks of these storage formats is that they do not support semantic indexing which is important for interactive data analysis where scientists...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.