Document retrieval is the process of matching of some sated user query against a set of free-text records (documents), its one major technique for organizing and managing information. This project was concerned with studying which of the different statistical measures in IR have the most effectiveness on document retrieval using a unified set of documents. The results show that the Cosine Simil...

We propose an approach for approximating the Jaccard similarity of two streams, J(A,B) = |A∩B| |A∪B| , for domains where this similarity is known to be high. Our method is based on a reduction from Jaccard similarity to F2 norm estimation, for which there exists a sketch that is efficient in terms of both size and compute time, which we augment by a sampling technique. Our approach offers an im...

ziziphora tenuior, named kakooti in farsi, is one of the aromatic and medicinal plants of a wide distribution in iran. in this study, rapd molecular markers, (by utilization of 16 primers) was applied to determine the genetic diversity of 39 samples of ziziphora tenuior from 21 geographical regions in iran. a number of 100 polymorphic bands out of 110 amplified ones was produced and analyzed th...

The impact of long-term grassland management regimes on microbial community structure in soils was assessed using multivariate analysis of polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) banding patterns of selected bacterial groups and PLFA (phospholipid fatty acid) profiling. The management regimes assessed were inorganic nitrogen (N) fertiliser application and so...

Representation of semantic information contained in the words is needed for any Arabic Text Mining applications. More precisely, the purpose is to better take into account the semantic dependencies between words expressed by the co-occurrence frequencies of these words. There have been many proposals to compute similarities between words based on their distributions in contexts. In this paper, ...

We outline a method for measuring in an efficient way an overall degree of similarity between different leaf-labelled trees. In particular, we consider rooted trees, either unordered or ordered and not necessarily carrying the same labels. The trees to be compared are first represented in the form of matrices whose entries are in the interval [O,1] and the actual comparison strategy then relies...

Tree comparison is ubiquitous in many areas. The simplest way for tree comparison is to define a pairwise distance measure. In a more refined comparison, one can establish a mapping between similar parts in two trees according to certain similarity measure. The best match problem for rooted leaf-labeled trees has been studied in the literature. However, no result has been found for the best mat...

rapd markers through an application of 23 decamer primers were employed for genetic diversity analysis of some sweet cherry cultivars. bands with good resolution and high repeatability were selected for evaluations. the 23 primers produced 188 bands, among which, 153 were polymorphic. cluster analysis of the cultivars was performed based on the presence (1) and absence (0) of the bands, using j...

Similarity measures between generalized trapezoidal fuzzy numbers (GTFNs) are employed to indicate the degrees of similarity between GTFNs. Although several similarity measures of GTFNs have been proposed in the literature, none has considered using the Jaccard index. In general, the Jaccard index is a statistic used for comparing the similarity and diversity of sample sets. This paper presents...

Similarity measures between generalized trapezoidal fuzzy numbers (GTFNs) are employed to indicate the degrees of similarity between GTFNs. Although several similarity measures of GTFNs have been proposed in the literature, none has considered using the Jaccard index. In general, the Jaccard index is a statistic used for comparing the similarity and diversity of sample sets. This paper presents...