26 research outputs found
Remotelaboratory: how to render lessvirtual as possible the meet with the instrumentation
No full text“Remote laboratory: how to render less virtual as possible the meet with the instrumentation”
No full textRouting and Wavelength Assignment OTDM/WDM Networks with Physical Impairments
No full textIn this paper we evaluate the impact that physical impairments have on the resource
consumption in Wavelength Division Multiplexing (WDM) networks where bandwidth
utilization is optimized performing an Optical Time Division Multiplexing (OTDM). In
particular we propose two modified heuristics to solve the problem of Routing and
Wavelength Assignment (RWA) in OTDM/WDM networks where physical impairments
are taken into account. In literature this RWA problem is referred to as S-RWA (Super-
Lightpath RWA) because Super-Lightpath must be routed. If D is the OTDM
multiplexing degree, a Super-Lightpath is able to carry all connections from a single
source node to D different destinations using the D time-slot carried out on each
wavelength. The effectiveness of the technique is evaluated on the COST 266 physical
topology and when random logical topologies with several connectivity degrees are
considered. The RWA problem under physical impairments has been solved versus D
and . The resource consumption is characterized by the average number n of
wavelengths used and the number nSL of Super-Lightpath routed. When a heuristic
optimizing the number of links occupied for each Super-Lightpath is used, we have
obtained for D==16 (n, nSL)=(24.3, 26) and (n, nSL)=(18.9, 145) when an S-RWA
problem with and without physical impairments is solved respectively. The increase in
number of Super-Lightpath was expected because the routing with physical
impairments leads to shorter Super-Lightpath so much more of them are needed to
solve S-RWA problem. On the contrary the lower number of wavelengths is explained
with a better distribution of the Super-Lightpaths on physical topology when physical
impairments are taken into account. In fact when they are not considered, Super-
Lightpaths are longer, it is more probable that two Super-Lightpaths have at least one
link in common and so a greater number of wavelengths are needed
Performance Evaluation of a QoS Technique for Bufferless Optical Packet Switches
No full textIn this paper we propose a technique to support Quality of Service for Bufferless Optical Packet Switches (OPS) equipped with shared Wavelength Converters (WC). The WCs sharing is fully, that is all of the arriving packets share the same pool of WCs. The QoS, expressed in terms of Packet Loss Probability, is differentiated by giving the packets different priorities in accessing both the output wavelengths and the WCs. The effectiveness of the QoS technique is studied by means of a sophisticated analytical model validated by simulation results. The results show that the proposed technique to support QoS allows a good differentiation of the QoS offered to the packets
The Isola Sacra Survey. Ostia, Portus and the port system of Imperial Rome
No full textThis is the final report of the geophysical survey of the Isola Sacra conducted by the Portus Project between 2007 and 201
Comunicazione, complessità, organizzazione e risultati di una ricerca sugli stili comunicazionali e relazionali nelle istituzioni sanitarie
No full textEthernet burst transport: A scalable solution for optical metro networks
No full textAn optical packet transport solution relying on a new Ethernet burst aggregation concept is presented. It allows to simplify and scale switch forwarding functionalities paving the way to 100GE/1TBE. Simulations show 90% packet processing reduction. ©2010 IEEE
Immune Memory After Respiratory Infection With Streptococcus pneumoniae Is Revealed by in vitro Stimulation of Murine Splenocytes With Inactivated Pneumococcal Whole Cells: Evidence of Early Recall Responses by Transcriptomic Analysis
No full textThe in vitro stimulation of immune system cells with live or killed bacteria is essential for understanding the host response to pathogens. In the present study, we propose a model combining transcriptomic and cytokine assays on murine splenocytes to describe the immune recall in the days following pneumococcal lung infection. Mice were sacrificed at days 1, 2, 4, and 7 after Streptococcus pneumoniae (TIGR4 serotype 4) intranasal infection and splenocytes were cultured in the presence or absence of the same inactivated bacterial strain to access the transcriptomic and cytokine profiles. The stimulation of splenocytes from infected mice led to a higher number of differentially expressed genes than the infection or stimulation alone, resulting in the enrichment of 40 unique blood transcription modules, including many pathways related to adaptive immunity and cytokines. Together with transcriptomic data, cytokines levels suggested the presence of a recall immune response promoting both innate and adaptive immunity, stronger from the fourth day after infection. Dimensionality reduction and feature selection identified key variables of this recall response and the genes associated with the increase in cytokine concentrations. This model could study the immune responses involved in pneumococcal infection and possibly monitor vaccine immune response and experimental therapies efficacy in future studies
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Chapter 7 - The Isola Sacra and the Port System of Imperial Rome (The Isola Sacra Survey: Ostia, Portus and the port system of Imperial Rome)
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