Search results for "Hypothesis"

showing 10 items of 426 documents

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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Difetto del nesso causale e manifesta insussistenza del fatto nel licenziamento per giustificato motivo oggettivo

2021

Con la sentenza n. 16253/2020 la Suprema Corte ha affermato che l’assenza di nesso causale tra la cessazione di un appalto e il licenziamento del lavoratore integra un’ipotesi di manifesta insussistenza del fatto posto alla base del licenziamento - con conseguente applicabilità della tutela reintegratoria attenuta di cui all’art. 18, comma 5, della legge n. 300/1970 - non riconducibile, pertanto, agli altri casi in cui il giudice dichiara risolto il rapporto concedendo la sola tutela indennitaria forte (da dodici a ventiquattro mensilità).

Settore IUS/07 - Diritto Del LavoroWith judgement no. 16253/2020 theSupremeCourt affirmed that the absence of causal linkbetween the termination of a contract and the dismissal of the worker integrates a hypothesis of manifest nonexistence of the fact at the basis of the dismissal with consequent applicability of the reinstatement protection afforded by art. 18 paragraph 5 of law no. 300/1970 and therefore does not fall within the other cases in which the judge declares the relationship terminated by granting an indemnity protection from twelve to twenty-four months salary.
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Robotics Construction Kits: From “Objects to Think with” to “Objects to Think and to Emote with”

2018

This paper discusses new ideas about the use of educational robotics in social-emotional learning. In particular, educational robotics could be a tool intended to allow children to acquire some of the basic aspects of human emotions and emotional functioning, and to understand how these relate to the mind and body. More specifically, by using robots such as the LEGO Mindstorm construction kits—which allow users to both construct the body of the robot and to provide it with a behavioural repertory—children have the opportunity to visualize (and manipulate) the relationship between the robot’s body and mind. This allows them to simulate “embodied emotional minds” and to reflect on new neurosc…

Settore M-PSI/01 - Psicologia GeneraleComputer Networks and CommunicationsMind–body problemComputer scienceemotional intelligence050105 experimental psychologyEducational robotics0501 psychology and cognitive sciencesCognitive scienceeducational roboticslcsh:T58.5-58.64lcsh:Information technologybusiness.industryEmotional intelligence05 social sciencesRoboticssomatic markersemotional intelligence somatic markers educational roboticsEmbodied cognitionRobotArtificial intelligenceConstruct (philosophy)businessSomatic marker hypothesis050104 developmental & child psychology
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Sequentially Forecasting Economic Indices Using Mixture Linear Combinations of EP Distributions

2021

This article displays an application of the statistical method moti- vated by Bruno de Finetti's operational subjective theory of probability. We use exchangeable forecasting distributions based on mixtures of linear com- binations of exponential power (EP) distributions to forecast the sequence of daily rates of return from the Dow-Jones index of stock prices over a 20 year period. The operational subjective statistical method for comparing distributions is quite different from that commonly used in data analysis, because it rejects the basic tenets underlying the practice of hypothesis test- ing. In its place, proper scoring rules for forecast distributions are used to assess the values o…

Settore MAT/06 - Probabilita' E Statistica MatematicaLogarithmDow-Jones index exponential power distributions fat tails logarithmic scoring rule mixture distributions partial exchangeability proper scoring rules subjective probability subjectivist statistical methods.Scoring ruleStatistical parameterExponential functionNormal distributionSettore SECS-S/06 -Metodi Mat. dell'Economia e d. Scienze Attuariali e Finanz.StatisticsEconometricsSettore SECS-S/01 - StatisticaLinear combinationMathematicsStatistical hypothesis testingJournal of Data Science
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Testing for local structure in spatiotemporal point pattern data

2017

The detection of clustering structure in a point pattern is one of the main focuses of attention in spatiotemporal data mining. Indeed, statistical tools for clustering detection and identification of individual events belonging to clusters are welcome in epidemiology and seismology. Local second-order characteristics provide information on how an event relates to nearby events. In this work, we extend local indicators of spatial association (known as LISA functions) to the spatiotemporal context (which will be then called LISTA functions). These functions are then used to build local tests of clustering to analyse differences in local spatiotemporal structures. We present a simulation stud…

Settore SECS-S/01 - Statisticaearthquakes hypothesis testing local indicators of spatiotemporal association permutation-based tests second-order product density function
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Metodologia della ricerca sociale e politiche pubbliche

2020

In questo capitolo si passano in rasegna i principali concetti che devono essere padroneggiati dal buon valutatore delle politiche pubbliche e gli strumenti che devono far parte della sua cassetta degli attrezzi. Trattando la causazione e l'esperimento vedremo come nel campo delle scienze sociali sia necessario avvalersi di alcuni accorgimenti per disegnare una buona ricerca valutativa. In this chapter we review the main concepts that must be mastered by the good public policy evaluator and the tools that must be part of his toolbox. In dealing with causation and experiment we will see how in the field of social sciences it is necessary to use some precautions to design good evaluative rese…

Settore SPS/12 - Sociologia Giuridica Della Devianza E Mutamento SocialeEvaluation implementation hypothesis theory research designs public policiesValutazione cauazione ipotesi teoria disegni di ricerca politiche pubbliche
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Does SARS-CoV-2 Trigger Stress-InducedAutoimmunity by Molecular Mimicry? A Hypothesis.

2020

Viruses can generate molecular mimicry phenomena within their hosts. Why shouldsevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) not be considered one of these?Information in this short review suggests that it might be so and, thus, encourages research aimingat testing this possibility. We propose, as a working hypothesis, that the virus induces antibodiesand that some of them crossreact with host’s antigens, thus eliciting autoimmune phenomena withdevasting consequences in various tissues and organs. If confirmed, by in vitro and in vivo tests,this could drive researchers to find effective treatments against the virus.

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)virusesantistress proteinslcsh:Medicinecrossreactive antibodiesWorking hypothesismedicine.disease_causeIn vivo testsViruscell stre03 medical and health sciences0302 clinical medicinecell stressAntigenmedicinemolecular mimicry030304 developmental biologyantistress protein0303 health sciencesbiologybusiness.industrySARS-CoV-2lcsh:Rmolecular chaperonesCOVID-19General Medicinemolecular chaperoneIn vitroMolecular mimicryImmunologybiology.proteinCommentaryAntibodybusiness030217 neurology & neurosurgeryJournal of clinical medicine
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Treatment of Traumatised Sexuality

2021

Based on therapeutic meetings with individuals who have experienced sexual violence and abuse, the challenge is how do we help these couples to establish sexual relationships on their own terms, without interference of defence or coping strategies they have used to protect themselves against the overwhelming experiences of violence or abuse in the past? This article will focus on therapeutic work with such couples and how to interact with them and support their efforts to establish satisfying sexual relationships, based on sexological experience as well as experience from work with traumatisation. The basis for our treatment is a modified version of William Masters and Virginia Johnson’s ap…

Sexual violencePsychotherapistHere and nowbusiness.industryVDP::Social science: 200::Psychology: 260lcsh:BF1-990sexual healthHuman sexualityCognitionTherapeutic workSexual relationshipsexual dysfunctionspsychological factorssexualityPeer reviewlcsh:Psychologysexual behaviorHypothesis and TheoryPsychologybusinessPsychologyGeneral PsychologyReproductive healthFrontiers in Psychology
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A Generalisation of the Mean-Variance Analysis

2009

In this paper we consider a decision maker whose utility function has a kink at the reference point with different functions below and above this reference point. We also suppose that the decision maker generally distorts the objective probabilities. First we show that the expected utility function of this decision maker can be approximated by a function of mean and partial moments of distribution. This ‘mean-partial moments’ utility generalises not only mean-variance utility of Tobin and Markowitz, but also mean-semivariance utility of Markowitz. Then, in the spirit of Arrow and Pratt, we derive an expression for a risk premium when risk is small. Our analysis shows that a decision maker i…

SkewnessRisk aversionAccountingSharpe ratioLoss aversionRisk measureRisk premiumEconometricsSortino ratioGeneral Economics Econometrics and FinanceExpected utility hypothesisMathematicsEuropean Financial Management
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Majority and minority influence, task representation and inductive reasoning

1996

One hundred and fifty-five participants had to solve a set of 2–4–6 like reasoning problems (Wason, 1960), in which they were told which hypothesis a majority (or a minority) proposed, as well as which example was used for the test. In a 2 × 2 design, participants were also told that the problems allowed either one single correct answer or several possible answers. Results show that, when the source is a majority and the problem allows one single answer, most participants adopt the source's hypothesis and use confirmatory testing. On the contrary, it is when the source is a minority and the problem allows several answers that most participants give alternative hypotheses and use disconfirma…

Social PsychologyAlternative hypothesisMinority influenceInductive reasoningRepresentation (mathematics)Set (psychology)PsychologySocial psychologyWason selection taskTest (assessment)Task (project management)
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