827 research outputs found
Synchronization of a WDM Packet-Switched Slotted Ring
No full textIn this paper, we present two different strategies of
slot synchronization in wavelength-division-multiplexing (WDM)
packet-switched slotted-ring networks. Emphasis is given to the
architecture behind the WDM Optical Network Demonstrator
over Rings (WONDER) project, which is based on tunable
transmitters and fixed receivers. The WONDER experimental
prototype is currently being developed at the laboratories
of Politecnico di Torino. In the former strategy, a slotsynchronization
signal is transmitted by the master station on a
dedicated control wavelength; in the latter, slave nodes achieve
slot synchronization aligning on data packets that are received
from the master. The performance of both synchronization strategies,
particularly in terms of packet-collision probability, was
evaluated by simulation. The technique based on transmitting a
timing signal on a dedicated control wavelength achieves better
performance, although it is more expensive due to the need for an
additional wavelength. However, the technique based on aligning
data packets that are received from the master, despite attaining
lower timing stability, still deserves further study, particularly
if limiting the number of wavelengths and receivers is a major
requirement. Some experimental results, which were measured on
the WONDER prototype, are also shown. Measurement results,
together with theoretical findings, demonstrate the good synchronization
performance of the prototype
Transmitter optimization and theoretical bounds for dispersion-limited optical fiber links
No full text
Editoriale
No full textSettembre 2024: Affrontare le Sfide della Salute degli Adolescenti
Cari lettori,
Con l’arrivo di settembre, siamo lieti di presentarvi un nuovo numero della Rivista Italiana di Medicina dell’Adolescenza. Questo mese, ci concentriamo su alcune delle sfide più pressanti che riguardano la salute dei nostri giovani, esplorando temi che spaziano dall’obesità all’assistenza sanitaria, dalle malattie croniche alla salute mentale.
L’Obesità: Un’Epidemia Globale
L’obesità è attualmente un’epidemia mondiale con un impatto significativo sulla salute. Nella Regione europea, oltre il 30% dei giovani tra i 5 e i 19 anni è in sovrappeso o obeso. L’obesità in età infantile e adolescenziale aumenta il rischio di malattie cardiovascolari (MCV) in età adulta. Segni di sindrome metabolica possono manifestarsi già negli adolescenti obesi, e le MCV, principale causa di morte nel mondo occidentale, possono essere prevenute agendo sui fattori di rischio modificabili.
Assistenza Sanitaria per gli Adolescenti
In Italia, l’assistenza sanitaria per gli adolescenti è garantita dalla rete della pediatria di famiglia fino ai 14 anni, estendibile a 16 anni in caso di patologie croniche. Tuttavia, la diffusione di consultori e sportelli di ascolto è poco omogenea. Il pediatra è spesso il medico più adatto per assistere gli adolescenti, anche nella delicata fase di transizione alle cure del medico dell’adulto.
Malattie Croniche e Adolescenza
L’adolescenza, estesa dai 10 ai 24 anni, è al centro di programmi di tutela della salute come l’iniziativa dell’OMS “Global Accelerated Action for the Health of Adolescents” (AA-HA!). La malattia cronica in adolescenza interferisce con la crescita fisica e lo sviluppo somatico, oltre a influenzare negativamente il benessere mentale e le relazioni sociali.
Celiachia e Crescita
La celiachia, una malattia autoimmune, può influenzare la crescita e lo sviluppo puberale degli adolescenti. Sintomi come bassa statura e pubertà ritardata sono comuni. È essenziale monitorare regolarmente i parametri di crescita e sviluppo per garantire un adeguato follow-up e migliorare la qualità della vita dei giovani pazienti.
La Medicina Narrrativa per la Salute degli Adolescenti
Il lockdown durante la pandemia da SARS-CoV-2 ha avuto un impatto significativo sugli adolescenti, interrompendo bruscamente il loro sviluppo naturale. L’esposizione a temi di morte e paura per il futuro ha aumentato i disturbi somatici e alimentari, e l’accesso ai servizi di cura è cresciuto. La medicina narrativa può rappresentare uno strumento utile per migliorare il benessere emotivo degli adolescenti.
Siamo convinti che la collaborazione tra professionisti della salute, educatori, famiglie e gli stessi adolescenti sia la chiave per affrontare queste sfide e costruire un futuro più sano per le nuove generazioni. Vi invitiamo a leggere con attenzione gli articoli di questo numero e a condividere con noi le vostre riflessioni.
Il supporto di tutti Voi è fondamentale nella promozione della salute dei Nostri adolescenti.
Buona lettura
Ethernet transmissions over large core polymer optical fibres: demonstration of an extended reach (425 m) LAN system
No full textDo all roads lead to rome? Critical reassessment of the individual patient meta-analysis on bypass grafts by gaudino et al.
No full textINTRODUCTION
The recent individual patient data meta-analysis by Gaudino et al. [1], comparing outcomes with different grafts for coronary artery surgery from not for this question-randomized trials, was met with questions on the methodology given that some of the results proved controversial.
The EJCTS reacted to various comments on the methodology and suggested an independent reanalysis of the data. The author group of the paper, led by Mario Gaudino, should be applauded for their scientifically sound cooperation in this exercise. In the spirit of open data and open science, the authors shared their entire dataset and the codes with the journal. The authors of this Editorial wish to express their gratitude and esteem for this behaviour, which exemplifies excellence in science.
The journal was particularly keen to have this process initiated because the topic is important, and the main players have considerable expertise in CABG research and statistics
Recent Results From the EU POF-PLUS Project: Multi-Gigabit Transmission Over 1 mm Core Diameter Plastic Optical Fibers
No full textRecent activity to achieve multi-gigabit transmission over 1 mm core diameter graded-index and step-index plastic optical fibers for distances up to 50 meters is reported in this paper. By employing a simple intensity-modulated direct-detection system with pulse amplitude or digital multi-tone modulation techniques, low-cost transceivers and easy to install large-core POFs, it is demonstrated that multi-gigabit transmission up to 10 Gbit/s over 1-mm core diameter POF infrastructure is feasible. The results presented in this paper were obtained in the EU FP7 POF-PLUS project, which focused on applications in different scenarios, such as in next-generation in-building residential networks and in datacom applications
Sensitivity and scaling laws of unamplified coherent architectures for intra-data center links beyond 100 gb/s
No full textWe present an analytical model that allows predicting the performance of a coherent receiver in an optical amplification-free data transmission over distances of the order of a few kilometres, typical of intradata center communications. The model includes noise contributions from the local oscillator intrinsic RIN, shot noise, thermal noise and the impact of receiver parameters such as the common mode rejection ratio, overall responsivity and bandwidth. Our findings highlight the possibility for coherent detection to be used in short-reach communications, with achievable power budgets well within the limit represented by the maximum admissible optical attenuation for these systems. We use our model to predict scaling laws toward higher bit rate
What Ashland parents told us about religious exemptions
No full textprepared by: Steve Robison, Amanda Timmons, Lorraine Duncan, Jim Gaudino, Martha Priedeman, Hank Collins.Title from PDF cover (viewed on January 15, 2020).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Optimal dimensioning of the 5G optical fronthaulings for providing ultra-high bit rates in small-cell, micro-cell and femto-cell deployments
No full textIn this work we employ the Optimal Topology Search (OTS) algorithm in order to perform an accurate techno-economic analysis of the optimal deployment of 5G networks in large urban areas based on two significant variables: the size of the cells, sweeping sizes from small-cells up to femto-cells, and the bitrate per user, considering bitrates ranging from high up to ultra-high bandwidth access. Results show that the femto-cell solution is the best option for providing ultra-high bit rate access to the users
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