in recent years, virtual communities have been significantly popular and almost all of them are targeted for business profitability. in our study, the profitability of these communities for businesses has been analyzed from a commercial perspective. the study considers virtual community as a business model which can have a great impact on consumer purchase decision process. with respect to refe...

We compared 2 rules-based genotype interpretation systems and real or virtual phenotype through a retrospective analysis of a prospective trial. Genotypes were determined with VircoGEN II (VIRCO) and were interpreted with either RetroGram 1.4 or TRUGENE HIV-1 (guidelines 3.0) or original virtual phenotype (Virtual Phenotype; VIRCO), as available in the year 2000. Among 188 human immunodeficienc...

This work presents the design and evaluation of an adaptive packet router aimed at supporting CC-NUMA traffic. We exploit a simple and efficient packet injection mechanism to avoid deadlock, which leads to a fully adaptive routing by employing only three virtual channels. In addition, we selectively use output buffers for implementing the most utilized virtual paths in order to reduce head-of-l...

the increasing world demand for fish cannot be met by capture fisheries. aquaculture production is increasing and nowadays cage culture has an important role in meeting the world’s fish demand. the design of the physical structure of a cage is determined by the oceanographic conditions of the culture site. each design is site-specific and knowledge of the topography, wind force and direction, p...

In a world where the energy crisis is becoming overwhelming, demand for integrating renewable sources increasing and forming microgrids an essential solution. The new microgrid systems, which depend mainly on instead of conventional synchronous generators, come with low inertia concern. This paper proposes virtual controller based high-pass filter (HPF) to support frequency AC while maintaining...

Direct current (DC) distribution systems and DC microgrids are becoming a reliable and efficient alternative energy system, compatible with the DC nature of most of the distributed energy resources (DERs), storage devices and loads. The challenging problem of redesigning an autonomous DC-grid system in view of using energy storage devices to balance the power produced and absorbed, by applying ...

Curbing incessant and erratic power supply to halls of residence within the University of Ibadan Campus has been an impetus that has led to an upsurge in the number of proposals all geared towards providing solution to this critical problem. One of such proposals opines the design of a virtual power plant (VPP). In proposing such, the author seeks to address the problem on a double approach – t...

the subject under investigation has been electronic learning (e-learning) or electronic education (e-education), specifically concentrating on virtual university. virtual university has been the subject of much debate in recent years. in short, the concept of virtual university denotes a learning/educational system/environment based on internet where higher education is promoted using tools and...

As one of core technologies of software rejuvenation, analytical models provide a decision-making basis for implementing rejuvenation. This paper builds analytic models using stochastic reward nets with three different rejuvenation policies: non-rejuvenation, time-based rejuvenation, and time and load-based delay rejuvenation, and presents how system transits from one state into another. The re...

Virtual machine (VM) technology is widely used in higher education to support pedagogy and research. However, without a standard platform for managing VM technology, VM-based infrastructure is likely to be acquired and deployed in an ad-hoc manner. The virtual computing lab (VCL) system is an open source cloud computing platform developed specifically to support higher education. The main goal ...