The 21st century has witnessed vast amounts of research into blended learning since the conception of online learning formed the possibility of blended learning in the early 1990s. The theme of this paper is blended learning in mainstream disciplinary communities. In particular, the paper reports on findings from the last two decades which looked at origination, development and future of blende...

The kth power of a graph G, denoted by Gk , is a graph with the same vertex set as G such that two vertices are adjacent in Gk if and only if their distance is at most k in G. The Wiener index is a distance-based topological index defined as the sum of distances between all pairs of vertices in a graph. In this note, we give the bounds on the Wiener index of the graph Gk . The Nordhaus–Gaddum-t...

purpose: using both ideational and social influences’ indicators, this study tries to identify and analyze the most influential researchers in imetrics. to do so, the researchers used a combination of h family indexes (h-index, g-index, and contemporary h-index) and co-authorship centralities (degree, betweenness, and closeness) for calculating ideational and social influences, respectively.met...

Keywords have played an important role not only for searchers who formulate a query, but also for search engines that index documents and evaluate the query. Recently, tags chosen by users to annotate web resources are gaining significance for improving information retrieval (IR) tasks, in that they can act as meaningful keywords bridging the gap between humans and machines. One critical aspect...

Social Engineering is an undeniable and pervasive threat to the security of information systems of an organization due to its reliance on social nature of human beings. Social engineering uses dynamic art of manipulating social behavior of human relationships to obtain unauthorized and privileged information. Corporations have pressing need to design and implement reasonable countermeasures and...