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...

Routing and data aggregation are two important techniques for reducing communication cost of wireless sensor networks (WSNs). To minimize communication cost, routing methods can be merged with data aggregation techniques. Compressive sensing (CS) is one of the effective techniques for aggregating network data, which can reduce the cost of communication by reducing the amount of routed data to t...

Immersive virtual environments offer a natural setting for educational and instructive experiences for users, and game engine technology offers an interesting, cost-effective and efficient solution for building them. In this paper we describe an ongoing project whose goal is to provide a virtual environment where the “real” location of the user is used to position the user’s avatar into the vir...

In this paper we deal with a scheduling algorithm that creates several virtual links on one physical link by switching the service between the virtual links. The switching is done in such a way that the physical link is available for each virtual link for a constant time, what provides full performance isolation between virtual links. Firstly, we present a detailed analysis of the scheduler, in...

Current technology makes it possible to simulate naturally-occurring spatial auditory cues quite accurately. However, the cost of such a system is not justifiable, or even desirable, for all applications. This paper surveys some of the applications currently using virtual auditory displays and some of the issues important in the design of virtual auditory displays. Keywords—virtual environments...

Virtual environments can be useful in many applications. For one, they allow designers to carry out design tasks without actually creating a physical prototype. This virtual prototyping approach leads to lower cost and a shorter time-to-market product development cycle. In order for virtual environments to be useful, it must include and integrate a variety of sensory components for visual, hapt...

Virtual worlds are one of the most promising and interesting lines of research and development in e-learning. Also, the recent maturity of 3D virtual world platforms like Second Life or OpenSimulator has made it possible to deploy such systems at a low cost in schools, colleges or companies. Therefore, these virtual world platforms have enabled the development of cost-effective virtual laborato...