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Suggestion Models in Geographic Exploratory Search

My PhD project focuses on the suggestion of information categories in exploratory search in a geographical domain. Geographical maps may challenge the user in the exploration of possibly complex information spaces, making difficult to find all the relevant data for the completion of her/his search task. I propose different models for concepts suggestion which, given a search query, allow the creation of clusters of categories useful for query expansion as a "you might be interested in" function. The training of these models is done by exploiting different types of information: search sessions, users» preferences and social data coming from Twitter.