The history of computing is a history of virtualization. Each increase in the number of abstraction layers separating the end user from the hardware makes life easier for the user but harder for the system capacity planner who must understand the relationship between logical and physical configurations to guarantee performance. In this paper we discuss possible architectures for virtual systems...

The emergence of mobile broadband technology provides a valuable service for users to transfer media content, surf the internet, and stream video on their mobile. Higher datarate capability depends on a strong signal from a base station and capacity from the network. 70-90% of wireless high data-rate demand is located inside buildings. A traditional macro base stations thin capacity blanket is ...

Implementation of advanced controls and diagnostic features in small commercial buildings typically requires realtime monitoring of the energy flows, such as the power consumption and cooling capacity of rooftop units. However, these measurements are expensive and therefore limit the application of these advanced features. In order to lower the measurement cost, virtual sensing technology for r...

ATM supports multiple quality of service classes for different application requirements. A Quality of Service is associated with a virtual path connection. Dynamic reconfiguration can generate an optimal virtual path connection network and maintains sufficient capacity to carry the established calls in progress. We developed a tool to present information specific to the changes of virtual path ...

Transformations in the marketplace have led manufacturing companies to focus on their core competences and compete through new forms of enterprise partnerships. A new concept of enterprise partnership is that of Virtual Enterprise wherein autonomous or independent companies come together to temporally address a specific market demand, by collaborating closely and presenting to the market as a s...

The allocation of wireless resources to many different services and service providers has resulted in a heavily fractured spectrum and inefficient use. However, new dynamic spectrum capabilities allow the recapture of this wastage. This work describes the creation of a virtual wireless network (VWN). Taking an approach based on cognitive radio techniques, the VWN allows new network services to ...

The combination of Network Function Virtualisation (NFV) and cloud-based radio access network (C-RAN) is a candidate approach for the next generation of mobile networks. In this paper, the novel concept of virtual radio resources, which completes the virtual RAN paradigm, is proposed. The key idea is to aggregate (and manage) all the physical radio resources, to create virtual wireless links, a...

The use of virtual paths in ATM networks reduces the call set-up delays, simplifies the hardware in the transit nodes and provides simple virtual circuit admission control. However, it also reduces the degree of capacity sharing and thus, increases the call blocking rate. We consider the following problem: given a network topology, link capacity of each physical link and traffic requirement of ...