1,165 research outputs found
Peer-to-peer wireless ultrawide-band localization of fast-moving entities
No full textThis thesis presents peer-to-peer localization techniques such that a group of mobile nodes can continuously track its topology, without relying on external infrastructure. Ultrawide-band (UWB) radios worn by each node (humans in our case) perform time-of-flight (TOF) measurements between different node pairs, ultimately determining the group topology. The key challenge pertains to the selection of which TOF measurements should be performed, since not all are needed to determine the topology. We show that phenomena like dilution of precision (DOP) and signal occlusion warrant careful node selection; otherwise, the localization accuracy degrades severely. Moreover, we show that the broadcast nature of wireless channels can be exploited to pipeline more TOF measurements in a smaller window of time. Of course, all these design decisions must survive the lack of clock synchronization, fast mobility and rotations of the nodes, and link quality degradationSubmission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2020-05-01The student, Umberto Ravaioli, accepted the attached license on 2018-04-14 at 13:01.The student, Umberto Ravaioli, submitted this Thesis for approval on 2018-04-14 at 13:15.This Thesis was approved for publication on 2018-04-15 at 11:59.DSpace SAF Submission Ingestion Package generated from Vireo submission #12250 on 2018-08-31 at 17:29:04Made available in DSpace on 2018-09-04T20:47:14Z (GMT). No. of bitstreams: 2
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Previous issue date: 2018-04-15Embargo set by: Seth Robbins for item 107401
Lift date: 2020-09-04T20:47:38Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 107401
Lift date: 2020-09-04T20:50:11Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 107401 on 2020-09-05T09:15:26Z
Surgical management of hepatocellular carcinoma — Western versus eastern attitude
No full textHepatocellular carcinoma (HCC) is the most common liver tumour and represents a significant health burden. The different characteristics of the disease in the various parts of the world, as much as economic and social features, explain only partially the great diversity in the treatment options offered to patients in different countries. The most apparent contrast in term of tumour management is between the western and eastern world. Striking differences involve not only the attitude towards indications for liver transplantation or liver resection but also the surgical techniques adopted. Although remarkable signs of progress have been achieved in surgical and pharmacological fields, univocal guidelines are yet lacking, preventing effective comparisons between retrospective studies and clinical trials. This review aims to analyse and compare some of the most relevant and essential traits of the eastern and western therapeutic strategy against HCC
Total p-nitrophenol determination in urine samples of subjects exposed to parathion and methyl-parathion by SPME and GC/MS
No full text
La donna del ritratto
No full textCon questo articolo Luigi Caramiello espone le caratteristiche fondamentali della ricerca, in campo pittorico, dell'artista emiliano Carlo Ravaioli. Il pittore mette in scena un interessantissimo campionario di figure femminili, nel quale i tratti, la postura, il look, l'abbigliamento, gli sguardi, le mani concorrono alla rappresentazione idealtipica di personaggi di donna che popolano il territorio della nostra contemporaneità. La scena primaria che l'artista evoca è quella dell'identikit, nel senso letterale e addirittura tecnico dell'espressione, cioè un'immagine che, seppur intravista fugacemente, si imprime nella memoria e lascia una traccia, nitida, oppure confusa, a metà strada tra il ricordo e il sogno. La rassegna promossa, non a caso, in partenariato con il Dipartimento di Scienze Sociali della Università Federico II di Napoli, si configura, per molti aspetti, come un'operazione di frontiera fra la produzione artistica in senso stretto e un progetto sofisticato di sociologia visuale. Il testo di presentazione di Caramiello costituisce una sorta di sintesi di questo percorso culturale
ABYSSAL BENTHIC FORAMINIFERA IN THE POLAR FRONT REGION (PACIFIC SECTOR): FAUNAL COMPOSITION, STANDING STOCK AND SIZE STRUCTURE
No full textWe have evaluated the quantitative composition of Rose Bengal-stained benthic foraminiferal assemblages of surface samples from two box cores (ANTA98-28 bc; ANTA01-01 bc) collected at the Polar Front in the Pacific sector of the Southern Ocean. Size structure, faunal composition and standing stock were analysed for living (Rose Bengal-stained) and dead foraminifera. The size fractions among 63-150, 150-250 and >250 mu m were counted separately in order to study the foraminiferal size distribution and to compare our results with earlier Antarctic studies. The low organic carbon content of the sediment, and hence the limited food availability, is reflected by very low standing stocks and low diversity values. Calcareous taxa dominated dead foraminiferal assemblages that were more diverse than the stained assemblages. In the sediment samples of ANTA01-01 bc, the living fauna contained agglutinated taxa and soft-shelled monothalamous forms. Our data represent the southernmost record of benthic foraminiferal community (63 degrees S) from the Polar Front region in the Pacific sector. These samples provide further evidence for the occurrence of meiofaunal foraminifera in extreme environments, like the Antarctic region, where the uncoupled annual variations in temperature and production cause strong effects on the structure of benthic communities
In favor of the Jarnagin-Blumgart classification.
No full texte would like to congratulate Ito et al for their excellent study that emphasized the important topic of extrahepatic bile duct resec- tion combined with hepatectomy in patients with hilar cholangiocarcinoma.1 We would also like to highlight some aspects of their report and relate it to our own experience. On the basis of our own clinical in- vestigation we fully agree that right or left sided hepatectomy associated with extrahe- patic bile duct resection represent the only surgical procedure that can achieve a com- plete cure with improved survival.2 The Au- thors described an excellent outcome in pa- tients treated with major hepatic resection combined with en-bloc extrahepatic bile duct resection, that were associated with higher R0 resection rate (P 0.0006) and improved disease specific survival and disease free survival (P 0.0005). Moreover it is extremely important, and for this the authors deserve sincere con- gratulations, the demonstration that with op- timal surgical management, a decreased in- cidence of local recurrence can be obtained in patients who undergo bile duct resection combined to hemihepatectomy (P 0.031). Ito et al emphasize the ability to obtain an R0 resection and improved disease specific and disease free survival in patients who undergo concomitant major liver resection. The conclusions reported by Ito et al, about the need for “routine� combined hep- atectomy with bile duct resection are con- vincing. This procedure can be performed safely and is more likely to be associated with histologically negative resection mar- gin. We therefore strongly agree with Ito et al while we are concerned about the curative role of the local hilar resection without hep- atectomy. We believe that no patients can be effectively cured with R0 resection by this limited procedure. This is due to the strong propensity of this highly locally invasive tumor to infiltrate the surrounding tissues, vascular structures and proximal bile duct along the perineural perivascular spaces and lymphatics. For these reasons it is inevitable that residual tumor frequently remains when local resection for hilar bile duct is not asso- ciated to major hepatic resection. However to draw the conclusions above, there are major issues to be discussed. The first issue concerns the appropriate definition of microscopic margin involvement that in the study by Ito et al was done “gener- ally� and not “routinely� by frozen sectio
Investigation on the presence of aromatic hydrocarbons, policyclic aromatic hidrocarbons, persistent organochloride compounds, phthalates and the breathable fraction of atmospheric particulate in the air of Rieti urban area
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