Search results for "Feedback"

showing 10 items of 538 documents

Experimental approach for testing the uncoupling between cardiovascular variability series

2002

In cardiovascular variability analysis, the significance of the coupling between two series is commonly assessed by defining a zero level on the magnitude-squared coherence (MSC). Although the use of the conventional value of 0.5 does not consider the dependence of MSC estimates on the analysis parameters, a theoretical threshold Tt is available only for the weighted covariance (WC) estimator. In this study, an experimental threshold for zero coherence Te was derived by a statistical test from the sampling distribution of MSC estimated on completely uncoupled time series. MSC was estimated by the WC method (Parzen window, spectral bandwidth B = 0.015, 0.02, 0.025, 0.03 Hz) and by the parame…

Series (mathematics)Kernel density estimationModels CardiovascularMyocardial InfarctionBiomedical EngineeringEstimatorComputer Science Applications1707 Computer Vision and Pattern RecognitionSignal Processing Computer-AssistedCoherence (statistics)CovarianceFeedbackComputer Science ApplicationsSpectral analysiElectrocardiographySampling distributionAutoregressive modelCardiovascular variability serieStatisticsHumansMagnitude-squared coherenceParametric statisticsMathematicsMedical & Biological Engineering & Computing
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Involving the elderly in the content development of a health enhancing tablet-based service

2014

The aim of the present study was to specify the needs of elderly for a health-enhancing tablet-based service. An interview study was performed with voluntary elderly (N=19, female 15, male 4, aged 76.2 years (SD 8.3)). The attitudes towards improving health behaviours and technology utilisation were explored. The content illustrations were developed for the interviews, and evaluated by participants using a numerical scale (1 very poor − 5 very good) and verbal feedback. Content analysis was used in the analysis of qualitative data. Taking care of one's own well-being comprehensively was the most important incentive to maintain one's activity. Content illustrations were evaluated as high (av…

Service (business)IncentiveMultimediaContent analysisScale (social sciences)Applied psychologyVerbal feedbackQualitative propertyContent developmentcomputer.software_genrePsychologycomputerDiversity (business)Proceedings of the 4th International Conference on Wireless Mobile Communication and Healthcare - "Transforming healthcare through innovations in mobile and wireless technologies"
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Digital control circuitry for the p53 dynamics in cancer cell and apoptosis

2010

Experimental work and theoretical models deduce a "digital" response of the p53 transcription factor when genomic integrity is damaged. The mutual influence of p53 and its antagonist, the Mdm2 oncogene, is closed in feedback. This paper proposes an aerospace architecture for translating the p53/Mdm2/DNA damage network into a digital circuitry in which the optimal control theory is applied for obtaining the requested dynamic evolutions of some considered cell species for repairing a DNA damage. The purpose of this paper is not to improve the analysis of the actual mathematical models but to demonstrate the usefulness of such digital circuitry design to detect and predict the cell species dyn…

Settore ING-IND/06 - Fluidodinamicap53 cellular circuitry feedback control protein networks signalling apoptosis
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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
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Adaptive Feedback Linearization Control of SynRM Drives With On-Line Inductance Estimation

2023

This article proposes an adaptive input-output Feedback Linearization Control ( FLC ) techniques for Synchronous Reluctance Motor ( SynRM ) drives, taking into consideration the iron losses. As a main original content, this work proposes a control law based on a new dynamic model of the SynRM including iron losses as well as the on-line estimation of the static inductances. The on-line estimation of the SynRM static inductances permits to inherently take into consideration the magnetic saturation phenomena occuring on both axes. As a major result, it permits a null stator current steady state tracking error even with a proportional derivative controller. The estimation law is obtained thank…

Settore ING-INF/04 - AutomaticaControl and Systems EngineeringAdaptive system feedback linearization control FLC inductances estimation synchronous reluctance motor SynRMElectrical and Electronic EngineeringIndustrial and Manufacturing EngineeringIEEE Transactions on Industry Applications
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Advanced Motion Control in Induction Motor Systems - Modelling, Analysis and Control

Using a unified notation, this thesis collects and discusses the most important steps and issues in the design of estimation and control algorithms for induction motors. It contains many estimation and control algorithms. Their stability is analyzed and their performance is illustrated by simulations and experiments on the same induction motor. An intense and challenging collective research effort is carefully documented and analyzed, with the aim of providing and clarifying the basic intuition and tools required in the analysis and design of nonlinear feedback control algorithms. This material should be of specific interest to engineers who are engaged in the design of control algorithms f…

Settore ING-INF/04 - AutomaticaInduction motor observability estimators Kalman filtering feedback control parameter identification.
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Cognitive rehabilitation of schizophrenia through NeuroVr training.

2013

Cognitive difficulties are prevalent in people with diagnosis of schizophrenia and are associated with poor long-term functioning. In particular, memory, selective, divided and sustained attention and executive functions are altered by this disease. We used a Virtual Reality environment (developed via the NeuroVr2.0 software) for the rehabilitation of shifting, sustained attention and action planning functions using tasks reminiscent of daily life tasks. Test and retest showed significant differences in the assessed cognitive dimensions.

Settore M-PSI/02 - Psicobiologia E Psicologia FisiologicaCognitive Behavioral TherapyVirtual Reality Exposure TherapyVirtual RealityBiofeedback PsychologyCombined Modality TherapyCognitive RehabilitationTreatment OutcomeExecutive functionSettore M-PSI/08 - Psicologia ClinicaTherapy Computer-AssistedSettore MED/48 -Scienze Infermierist. e Tecn. Neuro-Psichiatriche e Riabilitat.SchizophreniaHumansSettore MED/25 - PsichiatriaSoftwareStudies in health technology and informatics
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TRATTAMENTO DELL'INCONTINENZA FECALE MEDIANTE BIO-FEEDBACK IN PAZIENTI TRATTATI PER MALFORMAZIONI ANO-RETTALI

2011

Settore MED/20 - Chirurgia Pediatrica E Infantileincontinenza fecale bio-feedback
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Implementing a sustainable CSR Strategy through a System Dynamics Perspective: evidences from a Colombian case-study

2009

During last decades, Corporate Social Responsibility (CSR) strategies received a growing attention from both businesses and non profit organisations. However, very often organisations fail to correctly implement a successful CSR strategy. Through the analysis of a case-study, this paper tries to demonstrates how a CSR strategy could fail in the long term if a open-loop logic is adopted. On the contrary, by making explicit the feedback loops structure underlying a CSR strategy, the system dynamics approach is likely to better support decision makers in implementing effective CSR strategies able to foster sustainable long term growth. After discussing the main benefits and limits of the CSR c…

Settore SECS-P/07 - Economia AziendaleCorporate Social Responsibility system dynamics feedback case-study
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Small RNA‐binding protein RapZ mediates cell envelope precursor sensing and signaling in Escherichia coli

2019

Abstract The RNA‐binding protein RapZ cooperates with small RNAs (sRNAs) GlmY and GlmZ to regulate the glmS mRNA in Escherichia coli. Enzyme GlmS synthesizes glucosamine‐6‐phosphate (GlcN6P), initiating cell envelope biosynthesis. GlmZ activates glmS expression by base‐pairing. When GlcN6P is ample, GlmZ is bound by RapZ and degraded through ribonuclease recruitment. Upon GlcN6P depletion, the decoy sRNA GlmY accumulates through a previously unknown mechanism and sequesters RapZ, suppressing GlmZ decay. This circuit ensures GlcN6P homeostasis and thereby envelope integrity. In this work, we identify RapZ as GlcN6P receptor. GlcN6P‐free RapZ stimulates phosphorylation of the two‐component sy…

Small RNAsmall regulatory RNAcell envelope precursor glucosamine‐6‐phosphatemedicine.disease_causenegative feedback loopmetabolite sensing0302 clinical medicinetwo-component system QseE-QseFRNA-binding protein RapZRNA‐binding protein RapZGlucosamine0303 health sciencesbiologyEscherichia coli ProteinsGeneral NeuroscienceRNA-Binding ProteinsArticlesRNA BiologyMicrobiology Virology & Host Pathogen InteractionReceptors AdrenergicCell biologyDNA-Binding ProteinsRNA BacterialTransfer RNAPhosphorylationCell envelopeSignal TransductionGlucose-6-PhosphateGeneral Biochemistry Genetics and Molecular BiologyArticletwo‐component system QseE‐QseF03 medical and health sciencesBacterial Proteinscell envelope precursorEscherichia colimedicineRNA MessengerRibonucleaseMolecular BiologyEscherichia coli030304 developmental biologyMessenger RNAGeneral Immunology and MicrobiologyBinding proteinsmall RNAs GlmY and GlmZGene Expression Regulation BacterialMicroreviewRNA binding proteincell envelope precursor glucosamine-6-phosphatetwo-component systembiology.proteinRNA Small Untranslated030217 neurology & neurosurgeryThe EMBO Journal
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