L. Dumitriu

Publications (2)0 Total impact

• Conference Proceeding: Relative Qualification in Database Flexible Queries

  C. Tudorie, S. Bumbaru, L. Dumitriu
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  ABSTRACT: The simplest vague selection criterion in database queries is often expressed by a gradual property, or in other words, a certain qualification required to the targeted objects. Complex criteria often combine two or more simple and independent criteria, through an aggregation operation that means a multi-qualification of the searched objects. But there are also cases when in a complex criterion, one of the qualification is applicable in the context created from another attribute values, that means relative qualification. The relative qualification to another gradual property and the relative qualification to another crisp attribute are presented in the paper. In order to complete a real database querying problem, adequate procedures to dynamical defining linguistic values on database attributes are also proposed
  Intelligent Systems, 2006 3rd International IEEE Conference on; 10/2006
• Conference Proceeding: Finding the base of global implications for the association rule problem

  L. Dumitriu, T. Dumitriu, C. Tudorie
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  ABSTRACT: Using concept lattices as a theoretical background for finding association rules has led to designing algorithms like CHARM (Zaki and Hsiao (1999)), CLOSE (Pasquier, Bastide, Taouil, and Lakhal (1999)) or CLOSET (Pei, Han, and Mao (2000)). While they are considered as extremely appropriate when finding concepts for association rules, they do not cover a certain area of significant results, namely the pseudo-intents that form the base for global implications. We propose an approach that, besides finding all proper partial implications, also finds the pseudo-intents. The way our algorithm is devised, it allows certain important operations on concept lattices, like adding or extracting items, meaning we can reuse previously found results.
  Intelligent Systems, 2002. Proceedings. 2002 First International IEEE Symposium; 02/2002