Search results for "git"

showing 10 items of 7116 documents

Introduction: Periodic Signals and Filters

2018

In this chapter we briefly outline some well-known facts about Discrete-time periodic signals, their transforms and periodic digital filters and filter banks. For details we refer to the classical textbook A. V. Oppenheim and R. W. Schafer (Discrete-Time Signal Processing, Prentice Hall, New York, 2010, [3]) and Volume I of our book (Averbuch, Neittaanmaki and Zheludev, Spline and Spline Wavelet Methods with Applications to Signal and Image Processing, Periodic Splines, vol. 1 (Springer, Berlin, 2014)) [1] Throughout the volume, unless other indicated, \(N=2^{j}, \;j\in \mathbb {N}\).

Discrete mathematicsSpline (mathematics)Signal processingSpline waveletImage processingDigital filterMathematics
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About Graph Unions and Intersections

2020

Summary In this article the union and intersection of a set of graphs are formalized in the Mizar system [5], based on the formalization of graphs in [7].

Discrete mathematicsgraph theoryApplied Mathematics020207 software engineeringgraph intersection0102 computer and information sciences02 engineering and technology68v20Computer Science::Digital Libraries01 natural sciencesComputational Mathematicsgraph union010201 computation theory & mathematicsComputer Science::Mathematical SoftwareQA1-9390202 electrical engineering electronic engineering information engineering05c76Graph (abstract data type)MathematicsMathematicsofComputing_DISCRETEMATHEMATICSMathematicsFormalized Mathematics
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The effect of wavelet and discrete cosine transform compression of digital radiographs on the detection of subtle proximal caries. ROC analysis.

2007

The study compared diagnostic performances of 2 different image compression methods: JPEG (discrete cosine transform; Joint Photographic Experts Group compression standard) versus JPEG2000 (discrete wavelet transform), both at a compression ratio of 12:1, from the original uncompressed TIFF radiograph with respect to the detection of non-cavitated carious lesions. Therefore, 100 approximal surfaces of 50 tooth pairs were evaluated on the radiographs by 10 experienced observers using a 5-point confidence scale. Observations were carried out on a standardized viewing monitor under subdued light conditions. The proportion of diseased surfaces was balanced to approximately 50% to avoid bias. Tr…

Discrete wavelet transformDental CariesSensitivity and SpecificityDiagnosis DifferentialWaveletComputer Science::MultimediaDiscrete cosine transformHumansDental EnamelGeneral DentistryLossless JPEGTransform codingMathematicsObserver VariationMicroscopybusiness.industryPattern recognitioncomputer.file_formatMicrotomyRadiography Dental DigitalData CompressionJPEGROC CurveJPEG 2000DentinArtificial intelligencebusinesscomputerAlgorithmsImage compressionCaries research
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Digital signal processing for rail monitoring by means of ultrasonic guided waves

2007

Recent train accidents have reaffirmed the need for developing rail defect detection systems that are more effective than those used today. One of the recent developments in rail inspection is the use of ultrasonic guided waves (UGWs) and non-contact probing techniques to target transverse-type defects. Besides the obvious advantages of non-contact probing, that include robustness and a potential for large inspection speed, such a system can theoretically detect transverse defects under horizontal shelling or head checks. This paper demonstrates the effectiveness of digital signal processing to enhance the damage detection sensitivity of the non-contact system. The method proposed here comb…

Discrete wavelet transformSignal processingEngineeringGuided wave testingbusiness.industryMechanical EngineeringMetals and AlloysWaveletRail inspection Discrete Wavelet Transform Damage Index Laser Ultrasonics Air-coupled Ultrasonic Sensors.Mechanics of MaterialsRobustness (computer science)Rail inspectionMaterials ChemistryElectronic engineeringUltrasonic sensorSettore ICAR/08 - Scienza Delle CostruzionibusinessTelecommunicationsDigital signal processingInsight - Non-Destructive Testing and Condition Monitoring
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Iconografia e rappresentazione digitale

2017

Questo studio riguarda una ricerca svolta a partire dal 2016 sul tema della valorizzazione della rappresentazione architettonica attraverso una metodologia di lettura del patrimonio che ha messo in evidenza le possibilità offerte dalla modellazione digitale nell'interpretazione dell’iconografia storica, con l’obiettivo di acquisire una maggiore consapevolezza del territorio e del fatto architettonico. Nello specifico la ricerca ha riguardato lo studio dell’iconografia relativa alle cattedrali di Palermo, Monreale e Cefalù che rientrano nell'itinerario Arabo-Normanno dichiarato dall'UNESCO “Patrimonio Mondiale dell’Umanità”. Verrà qui trattato il caso studio di Cefalù con l’obiettivo di most…

Disegno iconografia modellazione digitale itinerario Arabo-Normanno Palermo Monreale CefalùDisegno iconografia modellazione digitale itinerario arabo-normanno Palermo Monreale CefalùDisegnoiconografiamodellazione digitaleMonreale CefalùSettore ICAR/17 - Disegnoitinerario arabo-normannoPalermo
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Un carnet de voyage digitale nella città di Akragas.

2017

L’articolo intende affrontare uno studio iconografico sulle rappresentazioni più emblematiche della città di Agrigento nelle quali i viaggiatori del Grand Tour tentarono di catturare l’essenza di quei luoghi un tempo massima sacralità del culto pagano, successivamente divenuti meta di approfondimento culturale che ispirarono l’immaginazione di disegnatori e letterati giunti in Sicilia, già a partire dal XVII secolo, per completare gli studi universitari e annotare le proprie esperienze suggellandole in quelle che Platone definiva “le forme più alte e più vere di conoscenza: le idee” per poi raccontarle attraverso itinerari grafici.

Disegno modello digitale Grand Tour itinerario grafico.Settore ICAR/17 - Disegno
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Biografia - Oscar Niemeyer

2018

La scheda biografica ripercorre i momenti più significativi dell'attività professionale dell'architetto brasiliano Oscar Niemeyer che durante i suoi settant'anni di carriera si occupò di opere a carattere espositivo e museale, di edifici multifunzionali, di architettura sacra, di interventi paesaggistici e urbani su vasta scala e della realizzazione di case uni-familiari lavorando in Algeria, in Brasile, in Francia e in Italia.

Disegno progetto Oscar Niemeyer modellazione digitaleSettore ICAR/17 - Disegno
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Elogio della macchina 'lenta'. Indagini digitali su Piero Bottoni

2011

Il testo evidenzia come il modello digitale sia da intendersi come "pinto di partenza" per l'analisi grafica dell'architettura e non esito finale; ad esso, infatti, si associano altri grafici, spesso non desunti dal modello, utili alla comprensione/traduzione dell'architettura. La costruzione del modello è l'esito ermeneutico e critico del disegno tendente sostanzialmente all'analisi della forma, il vero oggetto della imitazione.

DisegnoBottoniDigitaleSettore ICAR/17 - Disegno
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Is backward disequilibrium in the elderly caused by an abnormal perception of verticality? A pilot study

2007

International audience; OBJECTIVE: We hypothesised that backward disequilibrium (BD), defined by a posterior position of the centre of mass with respect to the base of support, could be caused by a backward tilt in the perception of verticality. METHODS: The relationship between BD, the perception of verticality, and the history of falls in 25 subjects aged 84.5+/-7.4 years was analysed. An original ordinal scale, the BD scale (BDS), was used to quantify BD. Postural (PV) and haptic verticals (HV) were measured in sagittal plane. RESULTS: BDS scores closely correlated with the number of falls (r = 0.81, p =10(-5)). The more the PV was tilted backward, the greater the BDS scores (r = -0.95, …

DisequilibriumPilot ProjectsAudiologySeverity of Illness IndexAbnormal perceptionMESH: Postural Balance[ SDV.NEU.SC ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive SciencesMESH: Aged 80 and over0302 clinical medicine030212 general & internal medicinePostural BalanceMESH: Geriatric Assessmentmedia_commonAged 80 and overMESH : Pilot Projects[SDV.NEU.SC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Cognitive SciencesMESH: PostureCognitionMESH: Accidental FallsSensory SystemsTilt (optics)medicine.anatomical_structureMESH : Vestibular Function TestsVestibular DiseasesNeurologyVisual PerceptionMESH : Severity of Illness IndexMESH : Accidental Fallsmedicine.symptomMESH: Vestibular DiseasesPsychologyMESH : Visual Perceptionmedicine.medical_specialtyMESH : Geriatric Assessmentmedia_common.quotation_subjectPostureMESH: Vestibular Function TestsBase of support03 medical and health sciencesMESH : Postural BalanceMESH: Severity of Illness IndexPhysiology (medical)PerceptionmedicineHumansMESH : Aged 80 and overGeriatric AssessmentCommunicationMESH: HumansMESH: Visual Perceptionbusiness.industryMESH : HumansMESH : PostureVestibular Function TestsMESH: Pilot ProjectsSagittal planeMESH : Vestibular DiseasesAccidental FallsNeurology (clinical)Haptic perceptionbusiness030217 neurology & neurosurgeryClinical Neurophysiology
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Filtros Digitales (2009/2010)

2009

En esta asignatura se describen las técnicas básicas de diseño de filtros selectivos en frecuencia (FIR e IIR), las estructuras más habituales para su implementación así como las consideraciones que se deben seguir para su implementación en sistemas con aritmética finita. Finamente se introduce el problema de la modificación de la frecuencia de muestreo con un ejemplo de aplicación de los filtros digitales.

Diseño de filtros digitalesIngenieria y ArquitecturaFiltro FIRFiltro IIREfectos de precision finitaOCWFiltros digitalesUNESCO::FÍSICA::Electrónica
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