Sleep Period Optimization Model For Layered Video Service Delivery Over eMBMS Networks

Long Term Evolution-Advanced (LTE-A) and the evolved Multimedia Broadcast Multicast System (eMBMS) are the most promising technologies for the delivery of highly bandwidth demanding applications. In this paper we propose a green resource allocation strategy for the delivery of layered video streams to users with different propagation conditions. The goal of the proposed model is to minimize the user energy consumption. That goal is achieved by minimizing the time required by each user to receive the broadcast data via an efficient power transmission allocation model. A key point in our system model is that the reliability of layered video communications is ensured by means of the Random Linear Network Coding (RLNC) approach. Analytical results show that the proposed resource allocation model ensures the desired quality of service constraints, while the user energy footprint is significantly reduced.Comment: Proc. of IEEE ICC 2015, Selected Areas in Communications Symposium - Green Communications Track, to appea

Despensar la "inmigración" (O un intento de conocer mejor las movilidades y alteraciones sociales contemporáneas)

La presente entrevista incide en todo un conjunto de interrogantes y discursos sobre esa categoría social cada vez más omnipresente que es la "inmigración" e intenta realizar así, un llamado de atención acerca de los modos en que se está produciendo y difundiendo conocimiento sobre las migraciones contemporáneas. Como todo ejercicio dialógico, la entrevista transciende los confines que definen su objeto y, de este modo, se presenta como un amplio recorrido por algunas de las principales problemáticas, autores y acontecimientos del devenir social de las últimas décadas. En este sentido, su contenido, al apuntar ideas, lecturas e indagaciones realizadas o en curso, no sólo da cuenta de una trayectoria sociológica personal, en la que se apuesta por -y se invita a- un necesario despensar la "inmigración", sino que señala algunos potenciales senderos por los que transitar epistemológica, teórica y metodológicamente en la siempre difícil tarea de elucidar los tiempos contemporáneos.This interview opens a whole range of questions and discourses about an increasingly discussed social category: immigration. It attempts to raise attention about the concept of contemporary migrations and its diffusion. Like any dialogue the interview transcend the limits that define its aim, and for this reason, appears as a vast journey among some of the main problems, agents and events of social change in recent decades. Targeting ideas, readings and past or current investigations, the interview shows a personal sociological background that suggests and invites to unthink the concept of immigration and also indicates potential ways to explore it epistemologically, theoretically and methodologically in the challenging task to better understand modern times

First record of Ribes uva-crispa L. (Grossulariaceae) from the Madonie Mts., a new species of the Sicilian flora.

In this study, a first record of Ribes uva-crispa L. (Grossulariaceae) – a new species of the Sicilian flora – from the Madonie Mts. is reported. The autochthonous and relict new population of Ribes uva-crispa L. (Grossulariaceae) is found on Mount Carbonara (Madonie Mts., North-Central Sicily), which is several hundred kilometers away from the Central Apenninic and the South Mediterranean locations of its distribution range. R. uva-crispa shows a distribution similar to other taxa extending from the Euro-Asiatic area to the mountains of North Africa with disjunct populations on the main Sicilian reliefs (Madonie and Nebrodi Mts.), testifying ancient phytogeographical connections. This noteworthy record adds a new species – as well as a new genus and new family – to the vascular flora of Sicily. Based on the morphological characters, the population found is to be referred to Ribes uva-crispa L. subsp. austro-europaeum (Bornm.) Bech var. glanduligerum (Lindberg) Maire

Contribution to the phytosociological characterization of the forest vegetation of the Sicani Mountains (inland of north-western Sicily).

The results of a phytosociological survey on the main forest vegetation aspects of the Sicani Mountains (inland of north-western Sicily), in turn included in the homonymous Regional Park recently established, are presented. This expansive territory (43,687 hectares), located between the Agrigento and Palermo provinces, is mainly composed by carbonate and silico-carbonate formations of the Sicani Units, whose highest peaks are represented by Mount Cammarata (1578 m a.s.l.), Mount delle Rose (1436 m), Pizzo Cangialoso (1420 m) and Mount Pernice (1393 m). Under the bioclimatic aspect, the area falls within the thermo- and supramediterranean belts, with ombrotype ranging from upper dry (annual average rainfall of about 550 mm) in the southern and western slopes, to upper subhumid (annual average rainfall of 800-1000 mm) – sometimes tending towards the wet – in the cacuminal part of the aforecited elevations. Many plant communities were identified and surveyed, several of which are described as new syntaxa; in particular they are some maquis associations [1) Rhamno alaterni-Euphorbietum dendroidis Géhu & Biondi 1997, with the subassociations typicum, phlomidetosum fruticosae (Brullo & Marcenò 1985) comb. nov., rhamnetosum oleoidis (Brullo & Marcenò 1985) comb. nov., celtidetosum aetnensis (Brullo & Marcenò 1985) comb. nov., euphorbietosum bivonae (Gianguzzi, Ilardi & Raimondo 1996) comb. nov.; 2) Ampelodesmo mauritanici-Juniperetum turbinatae Gianguzzi et al. 2012, with the subass. cistetosum cretici Gianguzzi et al. 2012; 3) Asparago albi-Artemisietum arborescentis ass. nova; 4) Euphorbio characiae-Anagyridetum phoetidis ass. nova, with the subass. asparagetosum albae subass.nova and loniceretosum implexae subass. nova; 5) Pistacio terebinthi-Celtidetum aetnensis Gianguzzi, Cusimano & Romano 2014, subass. typicum and phlomidetosum fruticosae Gianguzzi, Cusimano & Romano 2014)], a laurel oak community [Acantho mollis-Lauretum nobilis Gianguzzi, D’Amico & Romano 2010], some holm oak communities [7) Ampelodesmo mauritanici-Quercetum ilicis ass. nova hoc loco, with the subass.typicum subass. nova and viburnetosum tini subass. nova); 8) Sorbo torminalis-Quercetum ilicis ass. nova], some deciduous oak communities with Quercus virgiliana [9) Oleo oleaster-Quercetum virgilianae Brullo 1984; 10) Sorbo torminalis-Quercetum virgilianae Brullo, Minissale, Signorello & Spampinato 1996], a maple community with Acer pseudoplatanus [11) Sorbo graecae-Aceretum pseudoplatani Gianguzzi & La Mantia 2004], a riparian community with Salix sp. pl. [12) Salicetum albo-pedicellatae Brullo & Spampinato 1990] and some shrubby mantles [13) Hyperico majoris-Rubetum ulmifolii ass. nova; 14) Roso corymbiferae-Rubetum ulmifolii ass. nova; 15) Euphorbio characiae-Prunetum spinosae ass. nova; 16) Roso siculae-Prunetum spinosae ass. nova; 17) Crataegetum laciniatae Brullo & Marcenò in Brullo 1984]. A new alliance with a Tyrrhenian centre of gravitation (Asparago acutifolii-Laurion nobilis, in turn ascribed to the class Quercetea ilicis and to the order Quercetalia ilicis), within which the Laurus nobilis microwoods gravitating in the Italo-Tyrrhenian biogeographical Province are framed, is also proposed