since increasing the number of indexing and abstracting services covering a journal would increase the total citations received by the journal, this study tried to investigate the reasons why iranian journals are not indexed by foreign databases including isi web of science and scopus. this was a descriptive and interpretative study resulting in guidelines for iranian editors and authors. it al...

Several research works have focused on supporting index access in MapReduce systems. These works have allowed users to significantly speed up selective MapReduce jobs by orders of magnitude. However, all these proposals require users to create indexes upfront, which might be a difficult task in certain applications (such as in scientific and social applications) where workloads are evolving or ...

Database indices are fundamental data structures that improve the speed of data retrieval operations. In this paper, we focus on native XML database systems and provide an elementary survey of existing approaches for indexing semistructured data employed in selected academic open-source systems. Considering the requirements set for a particular system, ExDB, and the results of the accomplished ...

This paper explores the system of categories that is used to classi­ fy articles in Wikipedia. It is compared to collaborative tagging systems like del.icio.us and to hierarchical classification like the Dewey Decimal Classification (DDC). Specifics and common­ alities of these systems of subject indexing are exposed. Analysis of structural and statistical properties (descriptors per record, re...

The rapid growth of world-wide information systems results in new requirements for text indexing and retrieval. In this paper we propose an algorithm for query evaluation in text retrieval systems based on well-known inverted lists augmented with additional data structure and estimate expected performance gains. In addition to improved performance, this data structure is able to support dynamic...

<span>Search engines play a vital role in information retrieval (IR) indexing and processing vast diverse data, which now encompasses the ever-expanding wealth of multimedia content. However, search engine performance relies on efficiency effectiveness their systems (IRS). To enhance performance, there is need to develop more efficient accurate IRS that retrieves relevant quickly accurate...