Assessment of a robust opportunistic routing for video transmission in dynamic topologies

Mobile multimedia ad hoc services run on dynamic topologies due to node mobility or failures and wireless channel impairments. A robust routing service must adapt to topology changes with the aim of recovering or maintaining the video quality level and reducing the impact of the user's experience. In those scenarios, beacon-less Opportunistic Routing (OR) increases the robustness by supporting routing decisions in a completely distributed manner based on protocol-specific characteristics. However, the existing beacon-less OR approaches do not efficiently combine multiple metrics for forwarding selection, which cause higher packet loss rate, and consequently reduce the video quality level. In this paper, we assess the robustness and reliability of our recently developed OR protocol under node failures, called cross-layer Link quality and Geographical-aware OR protocol (LinGO). Simulation results show that LinGO achieves multimedia dissemination with QoE support and robustness in scenarios with dynamic topologies.

Imaginería sacra y espacios pictóricos en las comedias de santos de Lope de Vega

Departing from the concepts of visualism and theatricality understood as the base of the world view of an epoch, a reflection about the presence of a pictorial-based expressiveness in the performance of Lope’s comedias de santos is suggested. Besides the analysis of the suitable contexts and staging procedures associated to the appearance of sacred images on stage, static performances, closer to painting than to drama, are also taken into account as a device which contribute to create that transcendent meaning which is essential to hagiographical comedias.