We present an index data structure for metric-space databases. The proposed method has the advantage of allowing an efficient use of secondary memory. In the case of index entirely loaded in main memory our strategy achieves competitive performance. Our experimental study shows that the proposed index outperforms other strategies known to be efficient in practice. A valuable feature of the prop...

Text collections of data need not only search support for identical objects, but the approximate matching is even more important. A suitable metric to such a task is the edit distance measure. However, the quadratic computational complexity of edit distance prevents from applying naive storage organizations, such as the sequential search, and more sophisticated search structures must be applied...

We present a radically new indexing approach for approximate string matching. The scheme uses the metric properties of the edit distance and can be applied to any other metric between strings. We build a metric space where the sites are the nodes of the suffix tree of the text, and the approximate query is seen as a proximity query on that metric space. This permits us finding the occ occurrenc...

‎The aim of this paper is to establish and prove some results on common fixed point‎ for a pair of multi-valued mappings in complex valued $b$-metric spaces‎. ‎Our‎ ‎results generalize and extend a few results in the literature‎.  

Learning a distance metric from training samples is often a crucial step in machine learning and pattern recognition. Locality, compactness and consistency are considered as the key principles in distance metric learning. However, the existing metric learning methods just consider one or two of them. In this paper, we develop a multi-granularity distance learning technique. First, a new index, ...

In this paper, we address the problem of identifying academic reputation of researchers using scientific metrics in different research areas. Due to the characteristics of each area, researchers can present different behaviors. In previous work, we define Rep-Index that makes use of a profile template to individually identify the reputation of researchers. The Rep-Index is comprehensive and ada...