Search results for " congestion"

showing 10 items of 66 documents

FUZZY TCP: A PRELIMINARY STUDY

2002

Implementing efficient TCP for the Internet necessarily has to cope with the problem that the source does not know in advance which window allocation policy should be the best to use for a given network condition. In this paper, an on-line adaptive fuzzy system is used at the source in an objective to find the best possible weighted combination among the available policies.

Network congestionMathematical optimizationEngineeringTCP accelerationbusiness.industryDistributed computingHSTCPZeta-TCPTCP tuningTCP delayed acknowledgmentbusinessCommunications protocolFuzzy logicIFAC Proceedings Volumes
researchProduct

Efficient Queuing Schemes for HoL-Blocking Reduction in Dragonfly Topologies with Minimal-Path Routing

2015

HPC systems are growing in number of connected endnodes, making the network a main issue in their design. In order to interconnect large systems, dragonfly topologies have become very popular in the latest years as they achieve high scalability by exploiting high-radix switches. However, dragonfly high performance may drop severely due to the Head-of-Line (HoL) blocking effect derived from congestion situations. Many techniques have been proposed for dealing with this harmful effect, the most effective ones being those especially designed for a specific topology and a specific routing algorithm. In this paper we present a queuing scheme called Hierarchical Two-Levels Queuing, designed speci…

Network congestionQueueing theoryInterconnectionbusiness.industryComputer scienceDistributed computingScalabilityHOLNetwork performancebusinessNetwork topologyComputer network2015 IEEE International Conference on Cluster Computing
researchProduct

Transport Protocols for Remote Programming of Network Robots within the context of Telelaboratories for Education: A Comparative Analysis

2007

Within the context of tele-laboratories for education the use of the Internet as communication media permits any researcher/student to perform remote experiments in a simple and reliable manner. Moreover, this situation introduces many interesting issues like network protocols for Internet robots, the effects of variable bandwidth and time-delays on telerobotics, etc. In this paper we present a comparative analysis of using several Internet transport protocols when performing a remote experiment within the UJI Industrial Telelaboratory. TCP, UDP, Trinomial and TEAR protocols are analyzed using the NS2 simulator. Conclusions show a set of characteristics the authors of this paper consider ve…

Network congestionSIMPLE (military communications protocol)business.industryComputer scienceInternet layerDistributed computingComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSThe InternetContext (language use)businessCommunications protocolProtocol (object-oriented programming)Computer network2007 16th International Conference on Computer Communications and Networks
researchProduct

Performance Evaluation of CANIT Algorithm in Presence of Congestion Losses

2001

In this paper, we analize by queuing-simulation CANIT (Congestion Avoidance with Normalized Interval of Time) algorithm performances in presence of congestion losses. In a former work [3], we proposed the algorithm (CANIT) for TCP (Transmission Control Protocol) congestion avoidance phase in order to improve fairness during this phase, and we showed that using CANIT algorithm in an environment without loss, instead of standard congestion avoidance algorithm improves both congestion avoidance fairness and bandwith utilization for long RTT connections. In this paper, we consider congestion losses and show that the fairness as well as the bandwith utilization are more efficient when using CANI…

Network congestionTraffic congestionComputer scienceTransmission Control ProtocolComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSFairness measureTCP tuningCongestion windowRound-trip delay timeInterval (mathematics)H-TCPTCP congestion-avoidance algorithmAlgorithm
researchProduct

A Novel Multi-hop Broadcasting Method for VANETs Based on Autonomic Computing Paradigm

2014

One of the three best papers, Selected for the Annals of Telecommunications journal; International audience; Broadcasting is widely used in Vehicular Ad hoc Networks (VANETs) but it is hard to achieve efficiently since it depends on the network density, i.e. may cause network congestion if the protocols are not well designed. This paper introduces a novel Autonomic Dissemination Method (ADM) which delivers messages in accordance with given priority and density levels. The proposed approach is based on two steps: an offline optimization process and an online adaptation to the network characteristics. The aim is to make effective use of radio resources when there are many messages to send imu…

OptimizationVehicular ad hoc network[INFO.INFO-NI] Computer Science [cs]/Networking and Internet Architecture [cs.NI]Computer sciencebusiness.industryWireless ad hoc networkDistributed computing[ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI]Autonomic computingBroadcastingPriority levelHop (networking)Autonomic computingNetwork congestionDensity evaluation[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI]IEEEBroadcasting (networking)Broadcasting protocolbusinessComputer network
researchProduct

Traditional Chinese herbal medicine at the forefront battle against COVID-19: Clinical experience and scientific basis.

2020

Abstract Background Throughout the 5000-year history of China, more than 300 epidemics were recorded. Traditional Chinese herbal medicine (TCM) has been used effectively to combat each of these epidemics’ infections, and saved many lives. To date, there are hundreds of herbal TCM formulae developed for the purpose of prevention and treatment during epidemic infections. When COVID-19 ravaged the Wuhan district in China in early January 2020, without a deep understanding about the nature of COVID-19, patients admitted to the TCM Hospital in Wuhan were immediately treated with TCM and reported later with >90% efficacy. Approach We conducted conduct a systematic survey of various TCM herbal pre…

PTGS2 Prostaglandin-endoperoxide synthase 2BattleAIV avian influenza virusCoV coronavirusPharmaceutical ScienceiNOS nitric oxide synthaseViral infection0302 clinical medicinePA patchouli alcoholSARS Severe Acute Respiratory SyndromeSMD Sheganmahuang decoctionDrug DiscoveryPandemicIL InterleukinMedicine Chinese TraditionalALI acute lung injuriesmedia_commonCOVID-19 coronavirus disease 2019MXSG Ma xing shi gan decoction0303 health sciencesTNF tumor necrosis factorClinical Trials as TopicCCL2 CC chemokine ligand 2FM1 FM1 coronavirusICU intensive care unitc-AMP cyclic adenosine phosphateHIV human immunodeficiency virus030220 oncology & carcinogenesisCOX-2 cyclooxygenase-2Molecular MedicineHerbal preparationsMedicinal herbsAbbreviations: ACE2 angiotensin-converting enzyme IITCM traditional Chinese medicineHSV-1 herpes simplex virus 1CASP3 caspase 3medicine.medical_specialtyChinaCoronavirus disease 2019 (COVID-19)Systematic surveymedia_common.quotation_subjectJEV Japanese encephalitis virusNF-κB nuclear factor kappa B cellsAntiviral AgentsArticleWHO World Health Organization03 medical and health sciencesIEC-6 rat intestinal epithelial cell line 6SOD superoxide dismutaseCDC Center for Disease Control and PreventionmedicineAVP arginine vasopressinPGE2 prostaglandin E2HumansIntensive care medicineLH Lianhuaqingwen capsule030304 developmental biologyPharmacologyMedicinal herbMDA malondialdehydeGCGJ Gancao ganjiang decoctionNO nitric oxidePlants Medicinalbusiness.industrySARS-CoV-2COVID-19CXCL C-X-C- motif chemokineMDCK Madin-Darby Canine Kidney cellsTLR-4 Toll-like receptor-4COVID-19 Drug TreatmentComplementary and alternative medicineViral infectionLPS lipopolysaccharidesRSV respiratory syncytial virusQFPD Qingfeipaidu decoctionbusinessLung congestionECMO extracorporeal membrane oxygenationMAPK mitogen-activated protein kinasePhytotherapyDrugs Chinese HerbalPhytomedicine : international journal of phytotherapy and phytopharmacology
researchProduct

Exploring Airports’ Landside Congestion Impacts on the dynamic of Passengers Satisfaction

2014

Passengers SatisfactionSettore SECS-P/07 - Economia AziendaleAirports’ Landside CongestionSystem Dynamics
researchProduct

Stochastic description of traffic breakdown

2003

We present a comparison of nucleation in an isothermal-isochoric container with traffic congestion on a one-lane freeway. The analysis is based, in both cases, on the probabilistic description by stochastic master equations. Further we analyze the characteristic features of traffic breakdowns. To describe this phenomenon we apply the stochastic model regarding the jam emergence to the formation of a large car cluster on the highway.

Physics::Physics and SocietyMathematical optimizationEngineeringTraffic congestion reconstruction with Kerner's three-phase theoryStochastic modellingbusiness.industryTraffic flowTraffic congestionMaster equationContainer (abstract data type)Three-phase traffic theorybusinessTraffic generation modelSimulationSPIE Proceedings
researchProduct

Active queue management stability in multiple bottleneck networks

2004

In this paper, we show that the active queue management (AQM) controllers, usually configured on a single bottleneck basis, may not prevent instability in the presence of multiple bottlenecks. We justify this result through a multiple bottleneck model.

Queueing theoryAQM algorithmQueue management systemComputer sciencebusiness.industryDistributed computingStability (learning theory)Active queue managementBottleneckNetwork traffic controlManagementNetwork congestionCongestion control (communication)businessComputer network managementComputer network
researchProduct

Efeitos da sustentabilidade e valor logístico nas relações entre empresas de transporte marítimo

2020

Resumen El objetivo de este trabajo fue analizar cómo la sostenibilidad (económica, social y ambiental), bajo el enfoque de triple línea base, afecta la calidad de servicio, el valor logístico y la satisfacción en empresas del sector marítimo. Se propone un modelo teórico que se contrasta con la información suministrada por una muestra de 50 responsables de empresas (transitarios, importadores y exportadores) en Panamá. La información se analiza mediante la estimación de regresión por mínimos cuadrados parciales, que permite confirmar el carácter multidimensional de la sostenibilidad y del valor logístico. Los resultados también confirman que las percepciones de los clientes sobre las inici…

Responsabilidad social empresarialrelaciones business to businessEconomicsStrategy and Management//vocabularies.unesco.org/thesaurus/concept585 [http]Calidad de servicioRelaciones business to businessSatisfactionInternational tradeSocial responsibilityshipping industry//id.loc.gov/authorities/subjects/sh87004890 [http]Crecimiento económicoEmbarque de mercancíaspráticas sustentáveisCompañías de navegaciónindústria marítimaComercio internacionalManagement of Technology and InnovationShipment of goods//vocabularies.unesco.org/thesaurus/concept16052 [http]//vocabularies.unesco.org/thesaurus/concept3534 [http]logistic valueMarketing//id.loc.gov/authorities/subjects/sh85081260 [http]//id.loc.gov/authorities/subjects/sh85127728 [http]Responsabilidad socialCommerce internationalPrácticas sosteniblesMarine resources conservationSostenibilidadqualidade de serviçoQ56 SustainabilitySustainabilitybusiness-to-business relationships//vocabularies.unesco.org/thesaurus/concept6828 [http]Transporte marítimosustainable practicesEmploymentEconomics and Econometricsdemand supply and congestion [R41 Transportation]//id.loc.gov/authorities/subjects/sh85121576 [http]Steamboat linesConservación de los recursos marinos//id.loc.gov/authorities/subjects/sh85121579 [http]lcsh:Businessvalor logísticoindustria marítima//vocabularies.unesco.org/thesaurus/concept11744 [http]EconomíaShippingComercio exteriorSatisfacciónTransporte acuáticoBusiness and International Management//id.loc.gov/authorities/subjects/sh2009000375 [http]Economic growth//vocabularies.unesco.org/thesaurus/concept682 [http]calidad de servicioEconómicasprácticas sosteniblesIndustria marítimarelações business to businessSocial responsibility of business//id.loc.gov/authorities/subjects/sh85040850 [http]Maritime transport//id.loc.gov/authorities/subjects/sh85020473 [http]quality of service//id.loc.gov/authorities/subjects/sh85117681 [http]CarriersValor logísticolcsh:HF5001-6182Empresas de transporteEmpleoFinance
researchProduct