Search results for "ample"

showing 10 items of 2398 documents

Using Temporal Texture for Content-Based Video Retrieval

2000

Textures evolving over time are called temporal textures and are very common in everyday life. Examples are the smoke flowing or the wavy water of a river. The idea explored in this paper is that image features based on temporal texture could allow a better performance of current content-based video retrieval systems that are mainly based on static characteristics of representative frames, like color and texture. To this aim we analyze the spatio-temporal nature of texture and its application in content-based access to video databases. In particular, we represent temporal texture using the spatio-temporal autoregressive (STAR) model and a variation of self-organizing maps (SOM) where each n…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniComputer sciencebusiness.industryNode (networking)ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONVariation (game tree)Star (graph theory)CBIR texture analysisTexture (geology)Language and LinguisticsComputer Science ApplicationsHuman-Computer InteractionAutoregressive modelImage textureComputer visionQuery by ExampleArtificial intelligencebusinessRepresentation (mathematics)computerComputingMethodologies_COMPUTERGRAPHICScomputer.programming_languageJournal of Visual Languages & Computing
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A machine learning approach for user localization exploiting connectivity data

2016

The growing popularity of Location-Based Services (LBSs) has boosted research on cheaper and more pervasive localization systems, typically relying on such monitoring equipment as Wireless Sensor Networks (WSNs), which allow to re-use the same instrumentation both for monitoring and for localization without requiring lengthy off-line training. This work addresses the localization problem, exploiting knowledge acquired in sample environments, and extensible to areas not considered in advance. Localization is turned into a learning problem, solved by a statistical algorithm. Additionally, parameter tuning is fully automated thanks to its formulation as an optimization problem based only on co…

Settore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniOptimization problemSupport vector machineRange-free localizationbusiness.industryComputer science020206 networking & telecommunicationsSample (statistics)02 engineering and technologyMachine learningcomputer.software_genreSupport vector machineSoftware deploymentArtificial IntelligenceControl and Systems Engineering0202 electrical engineering electronic engineering information engineering020201 artificial intelligence & image processingArtificial intelligenceInstrumentation (computer programming)Electrical and Electronic EngineeringbusinessWireless sensor networkcomputerWireless sensor network
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A Psychometric Evaluation of the Group Environment Questionnaire in a Sample of Professional Basketball and Soccer Players

2013

Psychometric properties of the Group environment Questionnaire were investigated in a large sample of soccer (n = 222) and professional basketball players (n = 375). Confirmatory factor analysis was performed both on the total sample and on the two sub samples through a multi-group approach; associations between cohesion and the duration of belonging to the team were also explored. Results confirmed the four-factor structure proposed by Carron's original model even though some items with low loadings were eliminated. No signifcant associations were found between team cohesion and the duration of belonging to the team. © Perceptual & Motor Skills 2013.

Settore M-PSI/01 - Psicologia GeneraleAdultMaleBasketballTime FactorsAdolescentPsychometricseducationExperimental and Cognitive PsychologySample (statistics)BasketballYoung AdultSurveys and QuestionnairesSoccerHumansSensory SystemsConfirmatory factor analysisGroup cohesion psychometrics sport psychologyLarge sampleGroup ProcessesCohesion (linguistics)AthletesCohesion Group Environment Questionnaire Basket SoccerPsychologyFactor Analysis StatisticalSocial psychologyClinical psychology
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Development and Maintenance of Self-Disclosure on Facebook: The Role of Personality Traits

2019

This study explored the relationships between Facebook self-disclosure and personality traits in a sample of Italian users. The aim was to analyze the predictive role of Big Five personality traits on different parameters of breadth and depth of self-disclosed behaviors online. Facebook users, aged between 18 and 64 years of age ( M age = 25.3 years, SD = 6.8; N = 958), of which 51% were female, voluntarily completed an online survey assessing personality traits and Facebook self-disclosure. Results at a series of hierarchical regression analyses significantly corroborated the hypotheses that high extroverted and openness people tend to disclose on Facebook a significant amount of personal …

Settore M-PSI/01 - Psicologia GeneraleGeneral Arts and Humanitiesmedia_common.quotation_subjecteducation05 social sciences050301 educationGeneral Social SciencesSample (statistics)lcsh:History of scholarship and learning. The humanitiespersonality Big Five self-disclosure FacebookDevelopmental psychologylcsh:Social Scienceslcsh:Hlcsh:AZ20-9990502 economics and businessSelf-disclosurePersonalityBig Five personality traitsPsychology0503 education050203 business & managementmedia_commonSAGE Open
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The Reciprocal Influences among Motivation, Personality Traits, and Game Habits for Playing Pokémon GO

2018

This article reports a study exploring motivations of Pokémon Game use, individual differences related to personality traits, and game habits. First, it analyzed Pokémon GO motivations through exploratory factor analysis (EFA) by administering online the Pokémon GO Motivational Scale to a group of Italian gamers (N = 560). Successively, a Confirmatory Factor Analysis (CFA) was conducted testing three factorial models of Pokémon Game motivations on a selected random sample (N = 310). Results showed a three-factor model of Pokémon GO Game motivations (i.e. Personal Needs, Social Needs and Recreation), accounting for 68.9% of total variance plus a general higher order factor that best fits the…

Settore M-PSI/01 - Psicologia GeneraleRandom sampleHuman Factors and ErgonomicsConfirmatory factor analyses (CFA)Individual Difference0502 economics and businessMultivariant analysiPsychology0501 psychology and cognitive sciencesBig Five personality traitsPersonality traitComputingMilieux_MISCELLANEOUS050107 human factorsMotivationThree-factors model05 social sciencesSettore M-PSI/03 - PsicometriaComputer Science ApplicationsHuman-Computer InteractionExploratory Factor Analysis (EFA)Factorial model[SCCO.PSYC]Cognitive science/Psychology050211 marketingPsychologySocial psychologyReciprocal
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Design and analysis of discrete choice experiments for models with response time

2013

Settore SECS-S/02 - Statistica Per La Ricerca Sperimentale E TecnologicaA sector of conjoint analysis (experimental design in marketing research) is made of the so called choice experiments. In choice experiments respondents undergo a questionnaire which is nowadays mostly submitted through the internet. The questionnaire proposes to the respondent a sequence of choice sets each one including two or more profiles being a profile a specific combination of attribute levels. The respondent selects the preferred profile for each choice set. Responses given by a sample of respondents are analysed through suitable methods aimed to eventually find the best combination of attribute levels. One method of analysis adopts the Multinomial Logit (MLN) model. In this article the authors show the results of the MLN analysis compared with another model of analysis which uses an additional response which can be easily recorded by electronically submitted questionnaires. In practice modern survey platforms like “Qualtrics” (the one used for this work) can record the so called “response latency” i.e. the time taken by the respondent to make the choice and select the most preferred profile in the choice set. Thanks to a response latency model further refined in this work it is possible to deduce the relative weight of importance of the profiles for each choice set and respondent. This type of response can be used in place of the dichotomous choice variable in the MLN model. The two models and methods of analysis are deeply compared and it is critically discussed when it is better to use one or the other method. As a result a more reliable estimate of the optimal profile comes up implying lower risks for new investments and marketing decisions.
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A Proposal to estimate the roaming–dog Total in an urban area through a PPSWOR spatial sampling with sample size greater than two

2018

Settore SECS-S/05 - Statistica SocialeDogs roaming in urban areas constitute an issue for public order hygiene and health. Proper planning of actions for health and security control and allocation of financial funds require the knowledge of the roaming–dog–population size in a given urban area. Unfortunately a reliable statistical procedure aimed to measure such population is not available yet in literature. This paper presents a simple reproducible survey sampling procedure to estimate the number of roaming dogs in an urban area through the description of a real study carried out on a restricted area of the city of Palermo in southern Italy. A sample of areas is drawn by means of a drawn–by–drawn spatial sampling with probabilities proportional to size and without replacement (PPSWOR). As inclusion probabilities are not available in closed form they are estimated by Monte Carlo approach which is of simple implementation and permits design–based variance estimation even when first–order inclusion probabilities are unknown.
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Psychometric Properties of the Spanish Version of the Online Sexual Addiction Questionnaire: An Exploratory Study Using a Sample of Convicted Sex Off…

2021

Sexual addictionHealth (social science)medicineExploratory researchSpanish versionSample (statistics)medicine.diseasePsychologyLawApplied PsychologyPathology and Forensic MedicineClinical psychologyVictims & Offenders
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Much more than a clasp: Evolutionary pattern of amplexus diversity in anurans

2019

ABSTRACTThe evolution and diversification of animal reproductive modes have been pivotal questions in behavioral ecology. Amphibians present the highest diversity of reproductive modes among vertebrates, involving various behavioral, physiological and morphological traits. One of such features is the amplexus, the clasp or embrace of males on females during reproduction, which is almost universal to anurans. Hypotheses about the origin amplexus are limited and have not been thoroughly tested, nor had they taken into account evolutionary relationships in most comparative studies. However, these considerations are crucial to understand the evolution of reproductive modes. Here, using an evolu…

Sexual dimorphismAmplexusPhylogenetic treeEvolutionary biologyBehavioral ecologymedia_common.quotation_subjectTraitBiologyEvolutionary transitionsDiversity (politics)media_common
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Alteration of the structural properties of inulin gels

2019

Abstract In this work, inulin particle gels, prepared with a type of long chain inulin, were examined in terms of their structural properties and mechanical response, depending on the applied shear rates and temperature during gel preparation. The results are interpreted on the basis of a particle gel model, which takes into account the varying gel structure, depending on the sample preparation parameters. X-ray measurements of the inulin powder, used for the experiments, revealed a mostly amorphous powder. The temperature profiles for the sample preparation, chosen from 25 °C to 60 °C with constant stirring at 600 rpm, yielded viscoelastic particle gels with decreasing hardness. By applica…

Shearing (physics)Materials science010304 chemical physicsGeneral Chemical EngineeringInulin04 agricultural and veterinary sciencesGeneral Chemistry040401 food science01 natural sciencesViscoelasticityAmorphous solidchemistry.chemical_compound0404 agricultural biotechnologyChemical engineeringchemistry0103 physical sciencesParticleSample preparationStatic light scatteringParticle sizeFood ScienceFood Hydrocolloids
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