The paper investigates communities in Nigeria specifica ecosystem with the aim of generating baseline information on the similarity and diversity of emerging plant species. Hence the Jaccard Index of similarity and diversity was used to assess the variable nature of observed post remediation soil recovery sites. The study shows that the comparative analysis using the Jaccard successio 38.08% si...

Graph databases supporting retrieval based on structural similarity utilize structure indexes. A structure index is a data structure that indexes different structural features of member graphs. These features are typically extracted at insertion time. However, as the extraction of structural features may suffer from combinatorial explosion, the structure index takes long insertion time and larg...

We consider the problem of similarity search within a set of top-k lists under the Kendall’s Tau distance function. This distance describes how related two rankings are in terms of concordantly and discordantly ordered items. As top-k lists are usually very short compared to the global domain of possible items to be ranked, creating an inverted index to look up overlapping lists is possible but...

Four common similarity indices used in multivariate descriptive techniques, such as classifications and trellis diagrams, are compared over a range of overlap from 100 to 10 % to a theoretical standard. Only the Bray-Curtis Index (also known as Czekanowski's Quantitative Index, Proportional Similarity and a variety of other names) was found to reflect accurately true similarity. The other indic...

in order to evaluate the weed diversity in forage crop fields such as alfalfa (medicago sativa l.), clover (trifolium sp.) and sainfoin (onobrychis spp.) in different provinces of iran, a study was conducted by using data from reports of plant protection organization, ministry of agriculture during 2008. after evaluation of weed species and definition of weed family, these species classified ba...

t his paper presents a new feature selection approach for automatically extracting   ms lesions in 3d mr images. presented method is applicable to different types of ms lesions. in this method, t1, t2 and flair images are firstly preprocessed. in the next phase, effective features to extract ms lesions are selected by using a genetic algorithm. the fitness function of the genetic algorithm is t...

For fast ε-similarity search, various index structures have been proposed. Yi et al. proposed a concept multimodality support and suggested inequalities by which εsimilarity search by L1, L2 and L∞ norm can be realized. We proposed an extended inequality which allows us to realize ε-similarity search by arbitrary Lp norm using an index based on Lq norm. In these investigations a search radius o...