Los proyectos de vivienda de promoción oficial para la población civil en la ciudad de Las Palmas de Gran Canaria : 1939-1954

Programa de doctorado: Restauración y rehabilitación arquitectónica

Progetto e valutazione di un protocollo MAC per reti wireless ad-hoc

Per dare supporto al traffico multimediale in una rete totalmente distribuita come le reti ad-hoc, il protocollo MAC deve fornire garanzie di QoS. L'IEEE ha sviluppato un standard per supportare le QoS chiamato 802.11e, facente parte della famiglia 802.11. Per dare supporto al QoS viene proposto un nuovo protocollo chiamato PAB che consiste in un accesso al canale preceduto da una serie di invii di burst, inviati alla stessa frequenza dei dati, che inibiscono la trasmissione di stazioni avente minore priorità. Lo scopo di questo protocollo è fornire servizi QoS, evitare starvation e fornire un accesso equo tra le stazioni.

"Mi bèl pawòl, mi!" Rappresentazione delle lingue e della parola nella narrativa di Patrick Chamoiseau e Raphael Confiant (1986-1994)

From 1986 to 1994, Patrick Chamoiseau and Raphaël Confiant published a series of fictional and non-fictional writings focusing on language issues. Interest in these themes can certainly in part be explained by the "surconscience linguistique" that Lise Gauvin attributes to Francophone authors: a linguistic over-awareness which, in the case of these two Martiniquais writers, may be attributed to their Creole-French diglossia. Although we might believe that the idea of Gauvin is right, it doesn't seem enough to explain why the linguistic theme plays such a central role in Chamoiseau's and Confiant's works. Deeply influenced by Glissant's theories on Creole popular culture and Antillean literature (Le discours antillais), they conceived a "Créolité" poetics based on a primarly identity-based and geopolitical discourse. Declaring the need to build an authentically Creole literary discourse, one that finally expresses the Martiniquais reality, Chamoiseau and Confiant (as well as Bernabé, third and last author of Éloge de la créolité) found the «foundations of [their] being» in orality and its poetics in the Creole language. This belief was maily translated into their works in two ways: by representing the (diglossic) relationships occurring between their first languages (Creole and French) and by representing the Creole parole (orality) and its function. An analysis of our authors' literary and theoretical writings will enable us to show how two works that develop around the same themes and thesis have in fact produced very divergent results, which were perhaps already perceivable in the main ambiguities of their common manifestos.

Mac protocols for linear wireless (sensor) networks

Wireless sensor networks (WSNs) consist of a large number of sensor nodes, characterized by low power constraint, limited transmission range and limited computational capabilities [1][2].The cost of these devices is constantly decreasing, making it possible to use a large number of sensor devices in a wide array of commercial, environmental, military, and healthcare fields. Some of these applications involve placing the sensors evenly spaced on a straight line for example in roads, bridges, tunnels, water catchments and water pipelines, city drainages, oil and gas pipelines etc., making a special class of these networks which we define as a Linear Wireless Network (LWN). In LWNs, data transmission happens hop by hop from the source to the destination, through a route composed of multiple relays. The peculiarity of the topology of LWNs, motivates the design of specialized protocols, taking advantage of the linearity of such networks, in order to increase reliability, communication efficiency, energy savings, network lifetime and to minimize the end-to-end delay [3]. In this thesis a novel contention based Medium Access Control (MAC) protocol called L-CSMA, specifically devised for LWNs is presented. The basic idea of L-CSMA is to assign different priorities to nodes based on their position along the line. The priority is assigned in terms of sensing duration, whereby nodes closer to the destination are assigned shorter sensing time compared to the rest of the nodes and hence higher priority. This mechanism speeds up the transmission of packets which are already in the path, making transmission flow more efficient. Using NS-3 simulator, the performance of L-CSMA in terms of packets success rate, that is, the percentage of packets that reach destination, and throughput are compared with that of IEEE 802.15.4 MAC protocol, de-facto standard for wireless sensor networks. In general, L-CSMA outperforms the IEEE 802.15.4 MAC protocol.

SWISSspine—a nationwide health technology assessment registry for balloon kyphoplasty: methodology and first results

The Swiss Federal Office of Public Health demanded a nationwide health technology assessment registry for cervical and lumbar total disc arthroplasty and for balloon kyphoplasty (BKP) to make a decision about reimbursement of these interventions.