Information Retrieval by Enhanced Boolean Model

The interest for information retrieval has existed long before the Internet. Boolean retrieval is the most simple of these retrieval methods and relies on the use of Boolean operators. The terms in a query are linked together with AND, OR and NOT. This method is often used in search engines on the Internet because it is fast and can therefore be used online. This method has also its problems. The user has to have some knowledge to the search topic for the search to be efficient, e.g., a wrong word in a query could rank a relevant document non relevant. The retrieved documents are all equally ranked with respect to relevance and the number of retrieved documents can only be changed by reformulating the query. We consider p-norm approach, Max score and wand exact optimization techniques for ranked keyword retrieval that can be adopted via low cost screening process.