In this paper, we consider an energy harvesting cognitive radio network (CRN), where both of primary user (PU) and secondary user (SU) are operating in time slotted mode, and the SU powered exclusively by the energy harvested from the radio signal of the PU. The SU can only perform either energy harvesting or data transmission due to the hardware limitation. In this case, the entire time-slot i...

This paper summarizes recent research on networked virtual computing in the NICL lab at Duke. Over the past few years, we have constructed a service-oriented substrate for networked sharing and adaptive middleware environments based on a virtual on-demand computing. The goal of the project is to develop protocols and tools that can link together virtual computing clusters at different sites, an...

In this work, we introduce a new spectrum leasing based cognitive radio for OFDM-basedprimary/secondary networks.More precisely,wepropose a new leasing scheme both in time and frequency domains in a network composed of a primary transmission and some secondary (cognitive) users forming a cooperative relay network. In the proposed scheme, the primary user decides to lease a part of its available...

Infrastructure as a Service (IaaS) offers hardware resources (computing power, storage and network) as a service to its customers. The customers order these resources in the form of a lease. Aim of any service provider is to make a leasing plan to maximize the number of accepted leases. Opennebula is popular open source toolkit for building IaaS cloud. Opennebula has its own lease manager and i...