VINEA: a policy-based virtual network embedding architecture

Network virtualization has enabled new business models by allowing infrastructure providers to lease or share their physical network. To concurrently run multiple customized virtual network services, such infrastructure providers need to run a virtual network embedding protocol. The virtual network embedding is the (NP-hard) problem of matching constrained virtual networks onto the physical network. We present the design and implementation of a policy-based architecture for the virtual network embedding problem. By policy, we mean a variant aspect of any of the (invariant) embedding mechanisms: resource discovery, virtual network mapping, and allocation on the physical infrastructure. Our architecture adapts to different scenarios by instantiating appropriate policies, and has bounds on embedding efficiency and on convergence embedding time, over a single provider, or across multiple federated providers. The performance of representative novel policy configurations are compared over a prototype implementation. We also present an object model as a foundation for a protocol specification, and we release a testbed to enable users to test their own embedding policies, and to run applications within their virtual networks. The testbed uses a Linux system architecture to reserve virtual node and link capacities.National Science Foundation (CNS-0963974

An authorization model for XML databases

Université de Pau et des Pays de l’Adou

Dynamic business process management

Open e-PRIOR is an open source e-Procurement system developed by the European Commission. Currently Open e-PRIOR system is handling simple choreographies based on the exchange of a single main object. However, these different objects are related and part of larger business process and by handling the objects separately the full overview is lost. Business process management (BPM) helps organizations to understand and maintain complicated business workflow. This master thesis focuses on how BPM can provide a way to monitor the full business process and provide information to the stakeholders using the e-Prior system. The first part of the thesis explores the business context and relevant capabilities of the open e-PRIOR system. Secondly candidate BPM tools are compared against the modeling needs to select the most suitable one. Thereafter, Logical view of open e-PRIOR is re-designed and a new logical model of the open e-PRIOR system is proposed by implementing business process management system. Finally, a business process management task is designed and implemented by a business process management tool