in this paper, we consider a cooperative cognitive radio network in which there is an ofdm primary link and multiple single carrier secondary links.the primary link is required to maintain its secrecy rate above a predefined threshold. if the secrecy rate requirement is not satisfied, the secondary system help primary link to maintain its secrecy rate requirement. in doing so, the secondary trans...

Efficient project execution is an objective in many industries, and existing project management research gives direction about how project team factors influence two important capital project outcomes: time and cost. In addition, use of electronic collaboration (E-collaboration) technologies is essential for supporting projects. Combining a literature review with our empirical experience, we co...

introduction: the articles indexed in accredited citation databases essentially indicate how scientists share knowledge and promote sustainable development in each country. therefore, according to citations to the papers of individuals, it could be possible to assess the rate of their acceptability in the scientific community. the main objective of this study was to review lotka's law of scient...

this investigation postulatesvygotsky’s (1978) concept of zone of proximal development (zpd) and his related “scaffolding” metaphor as well as norton’s (2006) principles of sociocultural identity as its theoretical foundation.thisresearchintends to scrutinizethe socioculturally-oriented mediationalmechanisms utilized in student-student and student-teacher collaborationsin an iranian efl writing...

Discoveries, inventions, and research studies of scientists engineers in both academia industry have shaped the technology roadmaps companies telecommunications industry. IEEE Communications Society (ComSoc) provides platform venues for collaboration networking among global technical communities telecommunications, which are critical moving forward our It is this reason that ComSoc has created ...

This report describes a collaboration between researchers at the Technion in Haifa and the University of Southern California’s Information Sciences Institute in Los Angeles. The goal of the collaboration is to jointly construct an email analysis and routing system that will help city governments more rapidly deal with communications from their citizens. This system, or some variant of it, is pl...

this research investigates factors of enterprise portals of governmental organizations of iran. methods used in this research are literature and descriptive survey. data was gathered by a researcher-made checklist for enterprise portal factors in the enterprise portals of governmental organizations of iran. the checklist contains six factors that are content management, document management, col...

The advance in the global environment, rapidly changing markets, and information technology has created a new stage for design. In such an environment, one strategy for success is the Collaborative Product Development (CPD). Organizing people effectively is the goal of Collaborative Product Development, and it solves the problem with certain foreseeability. The development group activities are ...