In this paper we investigate hybrid rerouting and minimization of incurred service disruption period due to rerouting in Wavelength Division Multiplexed (WDM) transparent optical network. One limitation of such a network is the wavelength continuity constraint which does not allow a circuit to be placed on a non wavelength-continuous route. The impact of this constraint might have a severe cons...

Making backup is so cumbersome and expensive that individuals hardly ever backup their data and companies usually duplicate their data into a secondary server. This paper proposes a novel Peer-to-Peer (P2P) backup system known as the SecureBackup service, which was defined in the DisPairse research project. It utilizes the unused personal hard disk spaces attached to the Internet to implement a...

A Partial Order and partial reliable Connection (POC) is an end-to-end transport connection authorized to deliver objects in an order that can differ from the transmitted one. The service that this connection provides is also authorized to lose a number of objects. The POC approach establishes a conceptual link between both connectionless best-effort (CL) and connection oriented (OC) protocols....

This paper presents a problem of queuing theoretic performance modeling and analysis of Orthogonal Frequency Division Multiple Access (OFDMA) under broad-band wireless networks. We consider a single-cell WiMAX environment in which the base station allocates sub channels to the subscriber stations in its coverage area. The sub channels allocated to a subscriber station are shared by multiple con...

The quality of service (QoS) support for multimedia communications faces a big challenge in a fading wireless network. On one hand, conventional automatic repeat request (ARQ) schemes are not effective for small-scale fading channels with correlated errors due to consecutive retransmission failures. On the other hand, large-scale fading due to propagation loss or shadowing severely limits trans...

The core services in cloud computing environment are SaaS (Software as a Service), Paas (Platform as a Service) and IaaS (Infrastructure as a Service). Among these three core services server virtualization belongs to IaaS and is a service technology to reduce the server maintenance expenses. Normally, the primary purpose of sever virtualization is building and maintaining a new well functioning...

The notion of Customer Relationship Management (CRM) has been shown to be a worthwhile strategy in many service industries. This coupled with Internet advances means that it is now possible and even beneficial to extend CRM practices on the Internet (eCRM) and integrate them with the offline CRM programme. eCRM has can boost guests' satisfaction and patronage in the hospitality industry, as Int...

The universal mobile telecommunications system (UMTS) has distinct benefits in that it supports a wide range of quality service (QoS) criteria users require order to fulfill their requirements. transmission video and audio real-time applications places high demand on the cellular network, therefore QoS is major problem these applications. ability provide UMTS backbone network necessitates an ac...