Luísa Jorge

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Keywords: OR in telecommunications Paths with minimal cost sum Dual arc costs Disjoint paths Routing optimisation in some types of networks requires the calculation of the minimal cost pair of disjoint paths such that the cost functions associated with the arcs in the two paths are different. An exact algorithm for solving this NP-complete problem is(More)
To provide dependable services MPLS networks make use of a set of procedures (detection, notification and fault recovery) which seek to ensure appropriate protection for the traffic carried in the LSPs. When a fault happens in the active LSP, the recovery scheme must redirect the traffic to a recovery path (the protection LSP or recovery LSP) which bypasses(More)
This paper presents views on how quantitative multiple criteria decision-making (MCDM) approaches may be applied to certain aspects of user experience design and evaluation (D&E) methods identification, emphasizing its strengths and weaknesses for this task. Often D&E methods need to be applied in contexts different of those they had been applied before and(More)
Recent natural disasters have revealed that emergency networks presently cannot disseminate the necessary disaster information, making it difficult to deploy and coordinate relief operations. These disasters have reinforced the knowledge that telecommunication networks constitute a critical infrastructure of our society, and the urgency in establishing(More)
In end-to-end connections it is sometimes not possible to find a totally disjoint path pair. In this context it may be reasonable to accept a path pair which is as disjoint as possible, and thus provide the best (in a certain sense) level of the single fault protection that can be ensured. A Shared Risk Link Group (SRLG) is a group of links which have a(More)
The use of dynamic routing methods has an important impact on the performance of multi-service networks in overload and failure conditions. The paper describes and compares the performance of variants of reference dynamic routing methods (DAR and RTNR). Two variants of DAR (dynamic alternate routing), resulting from the extension to multi-service networks(More)
MultiProtocol Label Switching (MPLS) networks have been proposed as a solution to offer reliable, efficient and differentiated telecommunication services. Nowadays several applications require high quality service and cannot recover from traffic loss using retransmissions. Routing protocols can be robust and survivable but take a long time to recover from(More)
Path protection is a fast and capacity-efficient approach for increasing the availability of end-to-end connections. However, sometimes it is not possible to obtain a fully disjoint path pair. In this case, it may be admissible to consider a path pair which is as disjoint as possible, and thus provide the best (in a certain sense) level of the single-fault(More)
Due to the increasing dependence on network services of our society, research has recently been concentrating on enhancing traditional protection strategies to withstand large-scale failures, as in case of disaster events. The recently-formed EU-funded RECODIS project aims at coordinating and fostering research collaboration in Europe on disaster resiliency(More)