Deux constructions équivalentes d'un jeu d'arrangements pour les fichiers inverses multi-indices
Evaluating scientific products by means of citation-based models: a first analysis and validation.
Flexible information retrieval: some research trends.
In this paper some research trends in the field of Information Retrieval are presented. The focus is on the definition of flexible systems, i.e. systems that can represent and manage the vagueness and uncertainty which is characteristic of the process of information searching and retrieval. In this paper the application of soft computing techniques is considered, in particular fuzzy set theory.
Flexible representation and querying of heterogeneous structured documents
In this paper we present a fuzzy model for representing documents having a hierarchical structure and possibly containing multimedia information. We consider an archive containing documents with distinct (heterogeneous) logical structures. We also propose a flexible query language for expressing soft selection conditions on the structured documents. The documents’ content is organized into thematic (topical) sections where the index terms play a distinct role. The proposed document representation...
Foundation of information retrieval.
Fuzzy decision trees to help flexible querying
Fuzzy data mining by means of the fuzzy decision tree method enables the construction of a set of fuzzy rules. Such a rule set can be associated with a database as a knowledge base that can be used to help answering frequent queries. In this paper, a study is done that enables us to show that classification by means of a fuzzy decision tree is equivalent to the generalized modus ponens. Moreover, it is shown that the decision taken by means of a fuzzy decision tree is more stable when observation...
Fuzzy Improvement of the SQL
Fuzzy querying: issues and perspectives
The term query is widely used in the database as well as information retrieval communities. Basically, a query against a collection of information items (to be called later, for brevity, an information source) provides a formal description of the items of interest to the user posing this query. A source of information is meant here very generally. It may take the form of an archive of multimedia or textual documents, a database, or a knowledge base. In the three previous examples the information...
Fuzzy XML queries via context-based choice of aggregations
A flexible query model is presented for semi-structured information stored in well-formed XML documents, modeled as XML fuzzy graphs by computing estimates of the importance of the information associated to XML elements and attributes. The notion of fuzzy graph closure with threshold is then used to obtain a fuzzy extension of the XML fuzzy graphs’ topological structure. Weights associated to closure arcs are computed as a conjunction of the importance values of the underlying arcs in the original...
Guarantied Single Disk Access for Very Large Database Files
Guided Local Search for query reformulation using weight propagation
A new technique for query reformulation that assesses the relevance of retrieved documents using weight propagation is proposed. The technique uses a Guided Local Search (GLS) in conjunction with the latent semantic indexing model (to semantically cluster documents together) and Lexical Matching (LM). The GLS algorithm is used to construct a minimum spanning tree that is later employed in the reformulation process. The computations done for Singular Value Decomposition (SVD), LM and the minimum...
Halfspace Range Search: An Algorithmic Application of k-Sets.
How to improve efficiency of analysis of sequential data?
Image retrieval based on hierarchical Gabor filters
Content Based Image Retrieval (CBIR) is now a widely investigated issue that aims at allowing users of multimedia information systems to automatically retrieve images coherent with a sample image. A way to achieve this goal is the computation of image features such as the color, texture, shape, and position of objects within images, and the use of those features as query terms. We propose to use Gabor filtration properties in order to find such appropriate features. The article presents multichannel...
Implémentation optimale d'une relation dans une base de données relationnelle par un système de projecteurs
Incorporating an implicit time dimension into the relational model and algebra
Information aspects: A tool for redundancy control of data
Information capability of a database schema
Knowledge bases and automorphic equivalence of multi-models versus linear spaces and graphs
The paper considers an algebraic notion of automorphic equivalence of models and of multi-models. It is applied to the solution of the problem of informational equivalence of knowledge bases. We show that in the case of linear subjects of knowledge the problem can be reduced to the well-known in computational group theory problems about isomorphism and conjugacy of subgroups of a general linear group.
Large File Operations Support Using Order Preserving Perfect Hashing Functions