Search results for "performance [network]"

showing 10 items of 191 documents

PPARα GENE VARIANTS AS PREDICTED PERFORMANCE ENHANCING POLYMORPHISMS IN PROFESSIONAL ITALIAN SOCCER PLAYERS

2012

Settore BIO/10 - BiochimicaPPARαPERFORMANCE ENHANCING POLYMORPHISMSbiomarkers.
researchProduct

Effect of the construction process on the performances of asphalt paving mixes with crumb rubber from scrap tires

2004

This paper presents the results of an experimental study on the use of CRM (Crumb Rubber Modifier) in bituminous mixtures for asphalt pavements, using a Dry Process. Employing experimental methods capable of ensuring that the mixtures obtained and the stress conditions that they undergo in pavements are representative, we clarify some aspects relating to the design and production of mixtures; we also show the effects of the bitumen-rubber interaction on mechanical performances (fatigue resistance and rutting). Among the various factors involved in manufacture, a particular investigation was carried out on the effects of asphalt content, mixing temperatures and mixture compaction. The experi…

Settore ICAR/04 - Strade Ferrovie Ed Aeroportimixture design rubber tyres SHRP mechanical properties performance testing
researchProduct

Integration of a structural features-based preclassifier and a man-machine interactive classifier for a fast multi-stroke character recognition

2003

A transputer-based parallel machine for handwritten character recognition is proposed. An algorithm based on structural features and on a tree classifier was used to accomplish the pre-classification of the unknown sample in order to speed up the recognition process. The algorithm for the final classification is based on the description of the strokes through Fourier descriptors. The learning phase is accomplished through a man-machine interactive process. The proposed system can expand its knowledge base. A special representation of this knowledge base is proposed in order to record a great amount of data in a suitable way. A fast multistroke handwritten isolated character recognition syst…

Settore INF/01 - InformaticaComputer scienceIntelligent character recognitionbusiness.industrySketch recognitionPattern recognitionDocument processingIntelligent word recognitionComputingMethodologies_PATTERNRECOGNITIONFeature (machine learning)Artificial intelligencebusinessClassifier (UML)Man machine systems Character recognition Humans Handwriting recognition Pattern recognition Parallel machines System testing Performance evaluation Prototypes Energy management
researchProduct

Accessing and selecting menu items by in-air touch

2019

Is it possible to realize a non-visual, purely tactile version of an icon-based menu? Driven by such question, a hierarchical tactile dock was designed for an array of ultrasound emitters. The icons were conceived as spatio-temporal variable-speed sequences of tactile stimulation points, that are passively perceived as trajectories drawn on the palm of the hand. The recognition rate on four icons largely improved prior performance results obtained by active haptic exploration. As a result, a four-icons set can be used as the first level of a hierarchy of symbols that can be navigated by touch and gesture. The design process, based on controlled recognition experiments and exploration of dis…

Settore INF/01 - InformaticaHierarchy (mathematics)Haptic interfaces in-air haptics non-visual signageInformationSystems_INFORMATIONINTERFACESANDPRESENTATION(e.g.HCI)Computer sciencePerformance resultsHuman–computer interactionDOCKIconEngineering design processSet (psychology)computerGestureHaptic technologycomputer.programming_languageProceedings of the 13th Biannual Conference of the Italian SIGCHI Chapter: Designing the next interaction
researchProduct

Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniFree Space Optics (FSO) technologies for satellite communications offer several advantages: wide bandwidth high rate capability immunity to electromagnetic interference and small equipment size. Thus they are suitable for inter-satellite links deep space communications and also for high data rate ground-to-satellite/satellite-to-ground communications. Nevertheless FSO links suffer impairments that cause power signal degradation at the receiver. Scattering and absorption cause power signal attenuations predictable by suitable deterministic models. Optical turbulence causes random irradiance fluctuations which can generate signal fading events and can thereby only be predicted by statistical models. Attenuation and fading events can corrupt FSO links and so it would be recommended to add mitigation error codes on the communication link. FSO channel can be described as an erasure channel: fading events can cause erasure errors. We have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding on the source data that allows the receiver to recover the whole payload despite erasure errors. We implemented two different of rateless codes: Luby Transform (LT) and Raptor. We analyzed their performances on a simulated turbulent GEO FSO downlink (1 Gbps - OOK modulation) at a 106 μm wavelength and for different values of zenith angles. Assuming a plane-wave propagation and employing Hufnagel-Valley we modeled the downlink using: 1) a temporal correlated channel model based on Gamma-Gamma probability distribution and 2) an irradiance covariance function that we converted on a time function using Taylor frozen eddies hypothesis. Our new channel model is able to simulate irradiance fluctuations at different turbulence conditions as it will be shown in the full paper. We will also report performance results of LT and Raptor codes at overhead range varying between 0 and 50% and for different values of source packets.Settore ING-INF/01 - Elettronica
researchProduct

The egoistic approach to parallel process migration into heterogeneous workstation network

1996

Abstract A new approach to the allocation of processes in a distributed system is discussed. The proposed solution deals with process migration into heterogeneous systems by means of a strategy that delegates the individual parallel applications to manage the migration of their processes by themselves, on the basis of their own performance objectives. This approach is discussed in opposition to the global scheduling based one, and the load balancing objective is pursued as an effect of the optimization of individual applications. A new performance evaluation criterion is introduced that consists in monitoring the delays that occur when two parallel processes run towards a common synchroniza…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniWorkstationComputer scienceDistributed computingParallel processLoad balancing (computing)Performance objectiveGlobal schedulinglaw.inventionHardware and ArchitecturelawSimulated annealingDistributed Computing SystemsProcess migrationSoftwareJournal of Systems Architecture
researchProduct

I tamburi a cornice in Sicilia

2015

Le prime attestazioni della presenza del tamburo a cornice in Sicilia risalgono al V secolo a.C. Lo strumento è poi documentato fino ai giorni nostri attraverso raffigu¬razioni, documenti d’archivio, resoconti di viaggiatori stranieri, testi di interesse folklorico e, piuttosto ampiamente, dalla ricerca etnomusicologica moderna, per mezzo di audio-registrazioni e videofilmati. Morfologia, tecniche esecutive, repertori, decorazioni, contesto d’uso dei tamburelli in Sicilia si inscrivono nel più ampio quadro dell’area italiana (centro-meridionale) e mediterranea, ma con alcune specificità, soprattutto nelle tecniche esecutive. Queste, sebbene affini a quelle impiegate in altre regioni italian…

Settore L-ART/08 - EtnomusicologiaFirst evidences of frame drums in Sicily trace back to the V century b.C. Tambourines have been recorded until today by paintings archive documentation observations provided by foreign travellers folkloric literature and quite widely by modern ethnomusicology through audio and video recordings collected on the field. Morphology performance techniques repertoires decorations and social use of tambourines in Sicily refer to the wider context of Italian (central-southern part) and Mediteranean area but with some peculiarities chiefly referring to performance skills. Though similar to the techniques practised in other Italian regions in Sicily we can observe a typical style that can be connected with a common historical background with the Arabic-Islamic world.
researchProduct

SHARP: Environment and Person Independent Activity Recognition with Commodity IEEE 802.11 Access Points

2022

In this article we present SHARP, an original approach for obtaining human activity recognition (HAR) through the use of commercial IEEE 802.11 (Wi-Fi) devices. SHARP grants the possibility to discern the activities of different persons, across different time-spans and environments. To achieve this, we devise a new technique to clean and process the channel frequency response (CFR) phase of the Wi-Fi channel, obtaining an estimate of the Doppler shift at a radio monitor device. The Doppler shift reveals the presence of moving scatterers in the environment, while not being affected by (environment-specific) static objects. SHARP is trained on data collected as a person performs seven differe…

Signal Processing (eess.SP)Networking and Internet Architecture (cs.NI)FOS: Computer and information scienceshuman activity recognitionMobile computingComputer Science - Machine LearningCFRMonitoringSensorsComputer Networks and CommunicationsIEEE 802.11acneural networksWi-Fi sensingMachine Learning (cs.LG)Computer Science - Networking and Internet ArchitectureCSIActivity recognitionFOS: Electrical engineering electronic engineering information engineeringPerformance evaluationFeature extractionWireless fidelityElectrical and Electronic EngineeringElectrical Engineering and Systems Science - Signal Processingcontactless indoor monitoringSoftware
researchProduct

Radiation Hardness Assurance Through System-Level Testing: Risk Acceptance, Facility Requirements, Test Methodology, and Data Exploitation

2021

International audience; Functional verification schemes at a level different from component-level testing are emerging as a cost-effective tool for those space systems for which the risk associated with a lower level of assurance can be accepted. Despite the promising potential, system-level radiation testing can be applied to the functional verification of systems under restricted intrinsic boundaries. Most of them are related to the use of hadrons as opposed to heavy ions. Hadrons are preferred for the irradiation of any bulky system, in general, because of their deeper penetration capabilities. General guidelines about the test preparation and procedure for a high-level radiation test ar…

Small satelllitessmall satellitesComputer scienceRadiation effects02 engineering and technologytest methodology01 natural sciencesSpace missionsSpace explorationsystem-level testing0202 electrical engineering electronic engineering information engineeringRadiation hardeningTechnik [600]Reliability (statistics)avaruustekniikka[PHYS]Physics [physics]protonselektroniikkalaitteetrisk acceptance[PHYS.PHYS.PHYS-SPACE-PH]Physics [physics]/Physics [physics]/Space Physics [physics.space-ph]Commercial off-the-shelf (COTS)Test (assessment)facilitiesPerformance evaluationTotal ionizing doseSystem verificationtestmethodologyNuclear and High Energy Physicstotal ionizing dose (TID)0103 physical scienceselektroniikkaRadiation hardening (electronics)Electrical and Electronic Engineeringsingle-event effect (SEE)Functional verification010308 nuclear & particles physics600: Technikneutrons020206 networking & telecommunicationsTest methodSystem level testingReliability engineering[SPI.TRON]Engineering Sciences [physics]/ElectronicsNuclear Energy and EngineeringtestausmenetelmätsäteilyfysiikkaOrbit (dynamics)radiation hardness assurancejärjestelmätddc:600
researchProduct

Production of written French skills by first generation immigrants in working age

2013

This paper aims to identify factors explaining the level of proficiency in written French by immigrants in working age, knowing that few research has been conducted in France on this issue. The originality of this paper is the stochastic production frontier model to explain the scores in written French and the productive performance of immigrants (considered as producers of their own skills). The main results show that mother tongue, age at immigration, social life and mother's diploma are elements which influence the effectiveness of this production. They play a crucial role in the ability of immigrants to use effectively their duration of stay in France and their length of education, cons…

Social factorLearning foreign languages[SHS.EDU]Humanities and Social Sciences/EducationSkillsFacteur social[SHS.EDU] Humanities and Social Sciences/EducationForeign languages[ SHS.EDU ] Humanities and Social Sciences/EducationLangues étrangèresFrench foreign languageNiveau de compétencesModèle économiqueFrançais langue étrangèreEfficacité de l'enseignementTeaching effectivenessEvaluation des performancesApprentissage des langues étrangèresPerformance evaluationÉcritEconomic modelProduction frontierFrontière de productionAcquisition de compétencesskill levelimmigration
researchProduct