Alvaro Fernández

Learn More
It is demonstrated, through theory and numerical examples, how it is possible to directly construct a feed-forward neural network to approximate nonlinear ordinary diierential equations without the need for training. The method, utilizing a piecewise linear map as the activation function, is linear in storage, and the L 2 norm of the network approximation(More)
The veterinary parasiticide ivermectin was selected as a case study compound within the project ERAPharm (Environmental Risk Assessment of Pharmaceuticals). Based on experimental data generated within ERAPharm and additional literature data, an environmental risk assessment (ERA) was performed mainly according to international and European guidelines. For(More)
One of the goals of the EU CrossGrid project is to provide a basis for supporting the efficient execution of parallel and interactive applications on Grid environments. CrossGrid jobs typically consist of computationally intensive simulations that are often programmed using a parallel programming model and a parallel programming library (MPI). This paper(More)
Grid systems offer high computing capabilities that are used in many scientific research fields and thus many applications are submitted to these powerful systems. Parallel applications and applications consisting of interdependent jobs may especially be characterized by a complex workflow. Therefore, Grid systems should be capable of executing and(More)
Passive Optical Networks (PONs) are regarded as the preferred technology for broadband access networks. PONs provide high capacity and low-power consumption at a low-cost deployment. Besides, the dependability of PONs is becoming more important as end-users also expect access networks to be highly reliable. Operators, on the other hand, are more concerned(More)
Passive Optical Networks (PONs) are widely regarded as the best suited technology for deploying broadband access networks. As new services emerge, the dependability of PONs has become critical as end users expect access networks to be highly reliable. Although PONs dependability regarding hardware failures has been extensively studied, very little attention(More)
Passive Optical Networks (PONs) are one of the preferred technologies to deploy broadband access networks. As time passes, end users presuppose network connectivity to be always available, and expect PONs to be highly dependable. Yet operators, from an economic view, are interested in the costs related to failures. Thus, PONs dependability and associated(More)
Passive Optical Networks (PONs) are regarded as the preferred technology for broadband access networks. Lately, the dependability of PONs has become crucial as end-users expect access networks to be highly reliable. However, operators are more concerned with reducing the costs associated to failures. These costs include repair costs, payment of penalties(More)