Search results for " SDN"

showing 4 items of 4 documents

CADWAN – A Control Architecture for Dense Wi-Fi Access Networks

2018

The growing demands of ubiquitous computing are leading towards the densification of wireless access networks. The challenges of high density deployments can be addressed by network- wide centralized control. To this end we propose CADWAN – a Control Architecture for efficient management of Dense Wi-Fi Access Networks. Its main advantages are: flexibility (it supports software- defined wireless networking), scalability (it uses a three-tier optimization framework), and extendibility (it exploits a unified control interface with support for heterogeneous devices). Furthermore, CADWAN is complementary to ongoing developments in IEEE 802.11, especially 802.11ax.

Flexibility (engineering)Ubiquitous computingAccess networkComputer Networks and CommunicationsComputer sciencebusiness.industryWireless networkSettore ING-INF/03 - TelecomunicazioniInterface (computing)Distributed computing802.11ax CAPWAP dense networks optimization SDN Wi-Fi.020206 networking & telecommunications020302 automobile design & engineering02 engineering and technologyComputer Science Applications0203 mechanical engineeringScalability0202 electrical engineering electronic engineering information engineeringWirelessElectrical and Electronic EngineeringbusinessComputer network
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Heart rate variability in sick sinus syndrome: does it have a diagnostic role?

2019

BACKGROUND: Hypothesis of our study was that the irregular rhythm of sick sinus syndrome (SSS) was characterized by an augmented HRV. Objective was to assess whether SSS patients had a typical HRV profile. METHODS: We screened all 1947 consecutive Holter ECGs performed in our Units of Vascular Medicine and Internal Medicine and Cardioangiology at the University of Palermo (Italy) from April 2010 to September 2014. Among these, we selected 30 patients with ECG criteria of SSS. They were compared to 30 patients without SSS matched for age, sex and comorbidities. RESULTS: The SSS group had a lower mean heart rate (HR) (P=0.003), and a longer mean NN max-min longer (P<0.0005) compared to con…

Malemedicine.medical_specialtySettore MED/09 - Medicina Interna030204 cardiovascular system & hematologySick sinus syndrome03 medical and health sciences0302 clinical medicineHeart RatePredictive Value of TestsInternal medicineHeart ratemedicineHeart rate variabilityHumans030212 general & internal medicineAgedRetrospective StudiesAged 80 and overSick Sinus Syndromemedicine.diagnostic_testbusiness.industryRetrospective cohort studyMiddle Agedmedicine.diseaseSSS*ItalyHolter ECG HR SDNNi HRVPredictive value of testsCase-Control StudiesAmbulatoryCardiologyElectrocardiography AmbulatoryFemaleCardiology and Cardiovascular MedicinebusinessElectrocardiographyMinerva cardioangiologica
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Performance evaluation of OpenFlow enabled Commodity and Raspberry-pi Wireless Routers

2017

Software defined network (SDN) allows the decoupling of data and control plane for dynamic and scalable network management. SDN is usually associated with OpenFlow protocol which is a standard interface that enables the network controllers to determine the path of network packets across a network of switches. In this paper, we evaluate openflow performance using commodity wireless router and raspberry pi with two different SDN controllers. Our test setup consists of wired and wireless client devices connected to openflow enabled commodity wireless router and raspberry pi. All clients used traffic generator tool to transmits data to a sink server host. The results are promising and paves the…

OpenFlowComputer scienceRaspberry Pi02 engineering and technologyverkonhallinta0202 electrical engineering electronic engineering information engineeringWirelessRouting control planeRaspberry-piTraffic generation modelNetwork packetbusiness.industrysoftware defined network (SDN)ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS020206 networking & telecommunicationstietoliikenneverkotperformance evaluationNetwork managementOpenFlowWireless routerEmbedded systemScalability020201 artificial intelligence & image processingwireless SDNbusinessSoftware-defined networkingComputer network
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A Software Defined approach to the Internet of Things: From Wireless Sensor Networks to Network Operating Systems

Di recente il mondo delle reti di telecomunicazioni è stato caratterizzato dall’emergere del paradigma di Networking Software Defined (SDN). Grazie a questo approccio è possibile fornire un’interfaccia standard per lo sviluppo di software in grado di gestire i dispositivi di networking e i flussi di traffico che li attraversano, disaccoppiando il management della rete dal forwarding dei dati. Questa soluzione, di cui il protocollo di comunicazione OpenFlow è tra i maggiori esponenti, ha riscosso un notevole successo nelle reti cablate permettendo di superare il vendor lock-in e permettendo la gestione di dispositivi eterogenei tramite un unico punto di accesso logicamente centralizzato. …

SDNIoTSoftware Defined NetworkingIoT; SDN; Software Defined Networking
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