Tesis sobre el tema "Model Analysi"
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SANTORO, MAURO. "Inference of behavioral models that support program analysis". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19514.
Texto completoGuiotto, Annamaria. "Development of a gait analysis driven finite element model of the diabetic foot". Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3423117.
Texto completoIl diabete mellito è una malattia cronica sempre più frequente. Fra le complicanze ad esso associate vi è il cosiddetto “piede diabetico”. L’incidenza del diabete a livello mondiale è destinata a raddoppiare entro il 2030 passando dal 2.8% al 4.4% della popolazione ed il numero di pazienti affetti da diabete mellito che sviluppano ulcera podalica oscilla tra l’1.3% ed il 4.8%. Numerosi studi hanno evidenziato come i fattori biomeccanici giochino un ruolo fondamentale nell’eziologia, nel trattamento e nella prevenzione delle ulcere del piede diabetico. La letteratura recente sul piede diabetico indica che le sollecitazioni meccaniche, ossia le elevate pressioni plantari e/o gli elevati sforzi tangenziali, che agiscono all’interno dei tessuti molli del piede possono contribuire alla formazione di ulcere. È quindi importante studiare le interazioni piede-suolo durante il cammino nei pazienti diabetici, ma si rendono anche necessari dei modelli per la simulazione di sollecitazioni e deformazioni nel tessuto plantare del piede diabetico che permettano di predire le aree ad alto rischio di ulcerazione o di valutare l’efficacia di ortesi plantari nel ridistribuire in modo ottimale le pressioni plantari. I modelli agli elementi finiti consentono di tenere conto degli aspetti critici del piede diabetico, vale a dire il movimento, la morfologia, le proprietà dei tessuti e le sollecitazioni meccaniche. Di recente sono stati sviluppati diversi modelli bidimensionali (2D) e tridimensionali (3D) del piede con lo scopo di studiare il comportamento biomeccanico di piede e caviglia. Tuttavia, per quanto appurato dall’autore, in letteratura non è stato riportato un modello 3D agli elementi finiti del piede diabetico neuropatico con geometria dettagliata e specifica di un soggetto. Inoltre, i modelli 2D e 3D agli elementi finiti del piede presenti in letteratura sono stati raramente combinati con i dati del cammino specifici dei soggetti, sia in termini di forze di reazione al suolo e cinematica (come parametri di input) che in termini di pressioni plantari per la validazione. L’obiettivo dello studio qui presentato è stato quello di simulare il comportamento biomeccanico sia del piede di un soggetto sano che del piede di un soggetto diabetico neuropatico per prevedere l'area della superficie plantare caratterizzata da eccessive sollecitazioni. A tal scopo, sono stati sviluppati due modelli agli elementi finiti di piede e caviglia, utilizzando le geometrie specifiche dei piedi dei due soggetti (uno sano ed uno diabetico neuropatico) ottenute attraverso immagini di risonanza magnetica (MRI). Quindi sono state effettuate delle simulazioni mediante l'applicazione di carichi e di condizioni al contorno, ottenuti da dati di cinematica e cinetica, integrati e sincronizzati, acquisiti durante il cammino, specifici dei due soggetti sui rispettivi modelli agli elementi finiti. Pertanto in questa tesi sono stati descritti un protocollo integrato di cinematica-cinetica per l'analisi del cammino che permette di valutare la cinematica e la cinetica 3D dei sottosegmenti del piede e due modelli completi agli elementi finiti di un piede sano e di un piede diabetico neuropatico. Per stabilire la fattibilità di tale approccio, sono stati inizialmente sviluppati due modelli 2D agli elementi finiti del retropiede di un soggetto sano e di un soggetto diabetico neuropatico, tenendo conto della geometria ossea e del cuscinetto plantare, delle proprietà dei materiali dei tessuti molli, della cinematica e della cinetica. Questi ultimi sono stati acquisiti durante tre istanti della fase di appoggio del ciclo del passo. Una volta dimostrato il vantaggio di un simile approccio nello sviluppo di modelli 2D agli elementi finiti del piede, sono stati sviluppati i modelli 3D agli elementi finiti del piede intero degli stessi soggetti e sono state eseguite le simulazioni in vari istanti della fase di appoggio. La validazione delle simulazioni è stata effettuata attraverso il confronto tra le pressioni plantari simulate e quelle acquisite sperimentalmente durante il cammino degli stessi soggetti, nei corrispondenti istanti della fase di appoggio. Un secondo scopo dello studio qui presentato è stato quello di effettuare simulazioni del modello del piede del soggetto sano e di quello del soggetto neuropatico con dati di analisi del cammino rispettivamente di 10 soggetti sani e 10 diabetici neuropatici, al fine di verificare la possibilità di estendere i risultati dei modelli specifici dei due soggetti ad una popolazione più ampia. La validità di questo approccio è stata valutata tramite il confronto tra le pressioni plantari simulate e quelle sperimentali specifiche di ogni soggetto, acquisite durante il cammino. Inoltre gli errori delle simulazioni eseguite con i dati dei 20 soggetti sono stati confrontati con gli errori effettuati quando le simulazioni dei modelli avevano previsto l’utilizzo di dati di cammino specifici dei due soggetti la cui geometria podalica era stata ottenuta da MRI
VIRGILI, LUCA. "Graphs behind data: A network-based approach to model different scenarios". Doctoral thesis, Università Politecnica delle Marche, 2022. http://hdl.handle.net/11566/295088.
Texto completoNowadays, the amount and variety of scenarios that can benefit from techniques for extracting and managing knowledge from raw data have dramatically increased. As a result, the search for models capable of ensuring the representation and management of highly heterogeneous data is a hot topic in the data science literature. In this thesis, we aim to propose a solution to address this issue. In particular, we believe that graphs, and more specifically complex networks, as well as the concepts and approaches associated with them, can represent a solution to the problem mentioned above. In fact, we believe that they can be a unique and unifying model to uniformly represent and handle extremely heterogeneous data. Based on this premise, we show how the same concepts and/or approach has the potential to address different open issues in different contexts.
CHIESA, DAVIDE. "Development and experimental validation of a Monte Carlo simulation model for the Triga Mark II reactor". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2014. http://hdl.handle.net/10281/50064.
Texto completoFerrari, Rosalba (ORCID:0000-0002-3989-713X). "An elastoplastic finite element formulation for the structural analysis of Truss frames with application to ha historical iron arch bridge". Doctoral thesis, Università degli studi di Bergamo, 2013. http://hdl.handle.net/10446/28959.
Texto completoRosso, T. "METODI STATISTICI PER L'ANALISI E LA PREVISIONE DELLA MORTALITA' PER TUMORE". Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/344554.
Texto completoZANOTTI, FRAGONARA LUCA. "Dynamic models for ancient heritage structures". Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2502121.
Texto completoGUARNERA, DANIELE. "Refined one-dimensional models applied to biostructures and fluids". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729363.
Texto completoD'ALESSANDRO, ANNAMARIA. "Characterization of protein degradation arrest inducted by Epoxomicin in a neuroblastoma cell line model". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2008. http://hdl.handle.net/2108/385.
Texto completoMaintenance of cellular homeostasis and ability of cells to respond to their environment depend on orderly degradation of key regulatory proteins. The two main routes of protein clearance in eukaryotic cells are the ubiquitin-proteasome system (UPS) and autophagy-lysosome pathways (ALP). Even if UPS is more efficient than macroautophagy, in particular conditions (i.e. inhibition of proteasome), autophagy becomes the major clearance route. A variety of compounds, both synthetic analogs and natural products (i.e. Epoxomicin), have described in animal models as reminescence of neurodegenerative syndromes. These evidences have suggested us the need for a better characterization of the molecular insight induced by Epoxomicin. Our investigation sought to examine the biological effect of this injuring drug on SH-SY5Y cells, a human neuroblastoma (NB) cell line (cell morphological changes, induction of apoptosis, accumulation of polyubiquitinated proteins and activation of autophagy), to clarify by functional proteomics its impact on NB cells proteome and characterize the obtained informations flow through protein networks. The characterization of phenotypical, structural and functional impact of Epoxomicin on NB cells proteome was carried out by using different functional proteomic approaches (2DE combined to Peptide Mass Fingerprinting, Liquid Chromatography-Tandem Mass Spectrometry and nano-LC/MSE). All the distinct differentially expressed proteins (ctrl vs. treated) were examined for their known biological function and grouped in the respective functional categories. Some of them were also validated by western-blotting on different human NB cell lines and also on primary murine neurons, characterized by different genetic and phenotipical background. A more comprehensive analysis of the proteomic results was performed by a bioinformatic approach. Applying a Knowledge based Database approach we have drawn functional networks including the identified proteins and found that several of them are directed towards beta-estradiol, known for its neuroprotective properties. To confirm the central role played by estradiol we have treated our NB cell model with beta-estradiol, before the exposure to Epoxomicin. Results showed apoptosis reduction and cell cycle resumption associated to strong reduction of the ubiquitinated inclusions and autophagy induction. These data seem to suggest a protective role played directly by beta-estradiol in protein aggregates removing. Further investigation will be necessary to define the in vivo mechanism by which the identified proteins can be involved in responce to Epoxomicin.
RAMAZZOTTI, DANIELE. "A Model of Selective Advantage for the Efficient Inference of Cancer Clonal Evolution". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2016. http://hdl.handle.net/10281/100453.
Texto completoCHEMLA, ROMEU SANTOS AXEL CLAUDE ANDRE'. "MANIFOLD REPRESENTATIONS OF MUSICAL SIGNALS AND GENERATIVE SPACES". Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/700444.
Texto completoAmong the diverse research fields within computer music, synthesis and generation of audio signals epitomize the cross-disciplinarity of this domain, jointly nourishing both scientific and artistic practices since its creation. Inherent in computer music since its genesis, audio generation has inspired numerous approaches, evolving both with musical practices and scientific/technical advances. Moreover, some syn- thesis processes also naturally handle the reverse process, named analysis, such that synthesis parameters can also be partially or totally extracted from actual sounds, and providing an alternative representation of the analyzed audio signals. On top of that, the recent rise of machine learning algorithms earnestly questioned the field of scientific research, bringing powerful data-centred methods that raised several epistemological questions amongst researchers, in spite of their efficiency. Especially, a family of machine learning methods, called generative models, are focused on the generation of original content using features extracted from an existing dataset. In that case, such methods not only questioned previous approaches in generation, but also the way of integrating this methods into existing creative processes. While these new generative frameworks are progressively introduced in the domain of image generation, the application of such generative techniques in audio synthesis is still marginal. In this work, we aim to propose a new audio analysis-synthesis framework based on these modern generative models, enhanced by recent advances in machine learning. We first review existing approaches, both in sound synthesis and in generative machine learning, and focus on how our work inserts itself in both practices and what can be expected from their collation. Subsequently, we focus a little more on generative models, and how modern advances in the domain can be exploited to allow us learning complex sound distributions, while being sufficiently flexible to be integrated in the creative flow of the user. We then propose an inference / generation process, mirroring analysis/synthesis paradigms that are natural in the audio processing domain, using latent models that are based on a continuous higher-level space, that we use to control the generation. We first provide preliminary results of our method applied on spectral information, extracted from several datasets, and evaluate both qualitatively and quantitatively the obtained results. Subsequently, we study how to make these methods more suitable for learning audio data, tackling successively three different aspects. First, we propose two different latent regularization strategies specifically designed for audio, based on and signal / symbol translation and perceptual constraints. Then, we propose different methods to address the inner temporality of musical signals, based on the extraction of multi-scale representations and on prediction, that allow the obtained generative spaces that also model the dynamics of the signal. As a last chapter, we swap our scientific approach to a more research & creation-oriented point of view: first, we describe the architecture and the design of our open-source library, vsacids, aiming to be used by expert and non-expert music makers as an integrated creation tool. Then, we propose an first musical use of our system by the creation of a real-time performance, called aego, based jointly on our framework vsacids and an explorative agent using reinforcement learning to be trained during the performance. Finally, we draw some conclusions on the different manners to improve and reinforce the proposed generation method, as well as possible further creative applications.
À travers les différents domaines de recherche de la musique computationnelle, l’analysie et la génération de signaux audio sont l’exemple parfait de la trans-disciplinarité de ce domaine, nourrissant simultanément les pratiques scientifiques et artistiques depuis leur création. Intégrée à la musique computationnelle depuis sa création, la synthèse sonore a inspiré de nombreuses approches musicales et scientifiques, évoluant de pair avec les pratiques musicales et les avancées technologiques et scientifiques de son temps. De plus, certaines méthodes de synthèse sonore permettent aussi le processus inverse, appelé analyse, de sorte que les paramètres de synthèse d’un certain générateur peuvent être en partie ou entièrement obtenus à partir de sons donnés, pouvant ainsi être considérés comme une représentation alternative des signaux analysés. Parallèlement, l’intérêt croissant soulevé par les algorithmes d’apprentissage automatique a vivement questionné le monde scientifique, apportant de puissantes méthodes d’analyse de données suscitant de nombreux questionnements épistémologiques chez les chercheurs, en dépit de leur effectivité pratique. En particulier, une famille de méthodes d’apprentissage automatique, nommée modèles génératifs, s’intéressent à la génération de contenus originaux à partir de caractéristiques extraites directement des données analysées. Ces méthodes n’interrogent pas seulement les approches précédentes, mais aussi sur l’intégration de ces nouvelles méthodes dans les processus créatifs existants. Pourtant, alors que ces nouveaux processus génératifs sont progressivement intégrés dans le domaine la génération d’image, l’application de ces techniques en synthèse audio reste marginale. Dans cette thèse, nous proposons une nouvelle méthode d’analyse-synthèse basés sur ces derniers modèles génératifs, depuis renforcés par les avancées modernes dans le domaine de l’apprentissage automatique. Dans un premier temps, nous examinerons les approches existantes dans le domaine des systèmes génératifs, sur comment notre travail peut s’insérer dans les pratiques de synthèse sonore existantes, et que peut-on espérer de l’hybridation de ces deux approches. Ensuite, nous nous focaliserons plus précisément sur comment les récentes avancées accomplies dans ce domaine dans ce domaine peuvent être exploitées pour l’apprentissage de distributions sonores complexes, tout en étant suffisamment flexibles pour être intégrées dans le processus créatif de l’utilisateur. Nous proposons donc un processus d’inférence / génération, reflétant les paradigmes d’analyse-synthèse existant dans le domaine de génération audio, basé sur l’usage de modèles latents continus que l’on peut utiliser pour contrôler la génération. Pour ce faire, nous étudierons déjà les résultats préliminaires obtenus par cette méthode sur l’apprentissage de distributions spectrales, prises d’ensembles de données diversifiés, en adoptant une approche à la fois quantitative et qualitative. Ensuite, nous proposerons d’améliorer ces méthodes de manière spécifique à l’audio sur trois aspects distincts. D’abord, nous proposons deux stratégies de régularisation différentes pour l’analyse de signaux audio : une basée sur la traduction signal/ symbole, ainsi qu’une autre basée sur des contraintes perceptives. Nous passerons par la suite à la dimension temporelle de ces signaux audio, proposant de nouvelles méthodes basées sur l’extraction de représentations temporelles multi-échelle et sur une tâche supplémentaire de prédiction, permettant la modélisation de caractéristiques dynamiques par les espaces génératifs obtenus. En dernier lieu, nous passerons d’une approche scientifique à une approche plus orientée vers un point de vue recherche & création. Premièrement, nous présenterons notre librairie open-source, vsacids, visant à être employée par des créateurs experts et non-experts comme un outil intégré. Ensuite, nous proposons une première utilisation musicale de notre système par la création d’une performance temps réel, nommée ægo, basée à la fois sur notre librarie et sur un agent d’exploration appris dynamiquement par renforcement au cours de la performance. Enfin, nous tirons les conclusions du travail accompli jusqu’à maintenant, concernant les possibles améliorations et développements de la méthode de synthèse proposée, ainsi que sur de possibles applications créatives.
DI, MARIA Chiara. "Longitudinal mediation analysis with structural and multilevel models: associational and causal perspectives". Doctoral thesis, Università degli Studi di Palermo, 2022. http://hdl.handle.net/10447/533485.
Texto completoMASTRODONATO, STEFANO LUIGI. "Geographic representation in location intelligence problems analysis: the geo-element mapping chart". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2009. http://hdl.handle.net/2108/1061.
Texto completoMORADI, MONA. "Development of lumped parameters models for aerostatic gas bearings". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2733954.
Texto completoFavaretto, Chiara. "Development of a model for the assessment of Coastal Flooding Vulnerability: an application to the Venetian littoral". Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3424876.
Texto completoL’allagamento costiero è una tematica di grande attualità che ha suscitato negli ultimi anni una forte attenzione sia da parte della comunità scientifica che da parte degli amministratori e gestori del territorio. L’innalzamento del livello medio del mare dovuto ai cambiamenti climatici e la maggior frequenza di mareggiate estreme fanno prevedere una più alta probabilità di accadimento di eventi di ingressione marina lungo i litorali. La crescente urbanizzazione e la sempre più alta percentuale di persone che vivono nei litorali aumentano il valore esposto all'allagamento costiero, che va dunque studiato e approfondito per mitigare il rischio di perdite economiche, di danni al patrimonio artistico/culturale e all’ambiente e per scongiurare pericoli per l'incolumità delle persone presenti in questi territori. La motivazione di questa ricerca è scaturita dalla necessità, espressa dagli enti gestori e pianificatori della costa Veneta, di redigere mappe di rischio di allagamento che includessero tra le cause dell’alluvionamento non solamente l’esondazione di tipo fluviale, ma anche quella di origine costiera e di avere pertanto uno strumento rapido e scientificamente basato che consenta di rispondere in maniera unitaria e omogenea per tutto il litorale alla Direttiva Alluvioni (2007/60/CE). A tale scopo è stata predisposta una metodologia per definire mappe di rischio di allagamento attraverso un’analisi di diversi scenari a diverse scale temporali e spaziali. Il primo passo è stato implementare, dopo un articolato studio teorico e una accurata ricerca bibliografica, un modello numerico che risolve le equazioni del moto (ovvero le equazioni alle acque basse) in forma semplificata per simulare la propagazione dell’allagamento nell’entroterra. Le semplificazioni apportate alle equazioni (in particolare all'equazione della conservazione della quantità di moto) sono essenzialmente due: i) i termini avvettivi sono stati trascurati poiché risultano poco importanti nel tipo di fenomeno analizzato, ii) il termine di attrito, fondamentale per descrivere la propagazione, è stato linearizzato. Per garantire la positività della soluzione e la sua stabilità, evitando quindi la formazione di oscillazioni, sono state implementate alcune tecniche numeriche. Le equazioni semplificate sono adatte ad un calcolo in parallelo e pertanto il modello proposto ha come peculiarità l’utilizzo di algoritmi idonei all’uso di GPU, in grado quindi di analizzare grandi mappe in tempi di calcolo ridotti e di lavorare direttamente alla scala del pixel (utilizzando “Digital Elevation Model” DEM ad alta risoluzione) senza la necessità di creare mesh. Nel presente studio è stata utilizzata la GPU Nvidia Tesla K80 con 4992 core e 12 GByte di memoria, ottenendo tempi di calcolo, per domini molto estesi, pari al 3% di quelli necessari utilizzando una classica CPU. Il modello numerico di allagamento è stato esaminato attraverso il confronto con quattro benchmark molto noti in letteratura (due soluzioni analitiche delle equazioni alla acque basse e due prove sperimentali). Inoltre è stato applicato ad un caso reale di allagamento costiero avvenuto a Caorle (VE) nel Dicembre 2008, confrontando i risultati ottenuti con una mappa di aree allagate ricostruita grazie ad un video ripreso durante l’evento estremo. Il modello è risultato in buon accordo con le soluzioni analitiche, le misure di laboratorio e le informazioni disponibili. La metodologia è stata infine applicata alla costa della Regione Veneto, traendo vantaggio dall’ampia conoscenza geomorfologica e idraulica del territorio maturata nello svolgimento di una approfondita ricerca eseguita ed elaborata sui più recenti dati e misure disponibili per la zona costiera (Ruol et al. 2016, 2018). A partire dai dati di altezza d’onda e livello misurati alla Torre CNR “Acqua Alta” è stata condotta un’analisi statistica bivariata che ha permesso di valutare la probabilità di superamento associata a coppie di altezza d’onda e livello. L’obiettivo finale, ossia la redazione di mappe di allagamento, si avvale di una analisi di affidabilità di livello II (FORM). I risultati sono pertanto i valori di probabilità di superamento di un determinato livello idrico per ciascun pixel del DEM disponibile. Questo si traduce in un risultato di estremo interesse scientifico e pratico, ovvero la predisposizione di mappe di pericolosità all’allagamento costiero nell'arco temporale di 1 e 10 anni. Sono stati analizzati tre tratti che appartengono alla costa Veneta (in provincia di Venezia) e che hanno lunghezza compresa tra i 4 e i 15 km: il litorale di Valle Vecchia, il litorale di Caorle e il litorale di Cavallino. Le realizzazione di queste mappe e la conseguente individuazione delle zone più critiche vuole fornire un valido supporto per la programmazione e progettazione degli interventi che riguardano la protezione costiera dal rischio di ingressione marina lungo il litorale.
SIVORI, DANIELE. "Ambient vibration tools supporting the model-based seismic assessment of existing buildings". Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1045713.
Texto completoDA, SILVA PEREIRA DANIEL FILIPE. "Qualitative modelling of ecological systems: Extending calculation procedures and applications". Doctoral thesis, Università degli studi di Ferrara, 2020. http://hdl.handle.net/11392/2487971.
Texto completoLo scopo di questo lavoro di dottorato è di contribuire allo sviluppo della scienza delle reti in ambito ecologico. In particolare il lavoro si focalizza sulla tecnica della loop analysis ampliandone le potenzialità dell’algoritmo implementato su piattaforma informatizzata introducendo un’estensione quantitativa dell’algoritmo di predizione. Lo scopo è quello di rendere più efficace la ricerca dei maccanismi alla base delle risposte degli ecosistemi agli eventi perturbativi. Dopo una presentazione della metodologia e dei suoi limiti, con particolare attenzione alla mancanza di quantificazione dei coefficienti di interazione tra le component dell’ecosistema la tesi si sviluppa in tre capitoli. Nel capitolo 3 è presentato il software “LevinsAnalysis”, che è stato sviluppato in ambiente R. Lo compongono diverse funzioni che consentono una più agevole applicazione dell’algoritmo previsionale a qualsiasi rete interattiva di tipo ecologico (e non solo). L’applicabilità di tali funzioni è sviluppata attraverso un caso di studio inerente l’ecologia degli ambienti di savana. Il Capitolo 4 è dedicato a una applicazione ecologica e riguarda lo studio della comunità del Mar Caspio finalizzato alla comprensione dei meccanismi che hanno generato le trasformazioni ecologiche osservate in quell’ecosistema, con particolare riferimento alla riduzione drastica di alcune specie ittiche e di mammiferi e all’esplosione degli organismi gelatinosi. Lo studio ha mostrato l’importanza di alcune componenti dal punto di vista dinamico, e ha consentito di formulare ipotesi causative sulle risposte dell’ecosistema alle perturbazioni, risposte che si ricavano dallo studio dei percorsi di interazione e della loro intensità. Il capitolo 5 è sostanzialmente un capitolo di discussione in cui si enfatizzano gli aspetti applicativi della loop analysis anche in contesti non strettamente ecologici, data la versatilità della tecnica. Così lo strumento diventa importante per analizzare sistemi socio-ecologici, che considerano, cioè, non solo variabili ecologiche come prede e predatori ma anche le interferenze di organizzazioni governative, e gli effetti delle dinamiche sociali.
Cairo, V. "MOTIVAZIONI, VALUTAZIONE E PROSPETTIVE NELLA PARTECIPAZIONE DEGLI AGRICOLTORI ALLE MISURE AGRO-AMBIENTALI:ANALISI QUALI-QUANTITATIVA SU UN CAMPIONE DI AZIENDE LOMBARDE". Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/341976.
Texto completoPASTOR, ELIANA. "Pattern-based algorithms for Explainable AI". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2942116.
Texto completoAUGELLO, RICCARDO. "Advanced FEs for the micropolar and geometrical nonlinear analyses of composite structures". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2872330.
Texto completoAREZZO, DAVIDE. "An innovative framework for Vibration Based Structural Health Monitoring of buildings through Artificial Intelligence approaches ". Doctoral thesis, Università Politecnica delle Marche, 2022. http://hdl.handle.net/11566/299822.
Texto completoStructural health monitoring consists of identifying all those processes aimed at assessing the safety of a structure. These processes found their first application in the field of aerospace and mechanical engineering in order to assess the performance and occurrence of damage in mechanical components of vehicles and rotating industrial machinery. Over time, the need to assess the health status of structures has also led to the use of these techniques in the field of civil engineering, in particular vibration-based monitoring through the application of Operational Modal Analysis (OMA) techniques. These techniques are well established, based on solid theoretical foundations, and implemented in numerous frameworks for structural health monitoring. However, the definition and implementation of an effective dynamic monitoring capable to detect damage requires a high degree of multi-disciplinary and the contribution of specialists from different fields, i.e., measurement engineering, computer science, electronic engineering, dynamic identification, structural engineering, data science. During the PhD activities an effort have been made for the development of a framework for Vibration-Based Structural Health Monitoring system (VB-SHM) in all its part, attempting to achieve replicability of the system and its effectiveness in correctly tracking the health conditions of the structure over time. Replicability is crucial to promote the widest possible spread of this kind of monitoring. The framework has been developed starting from results obtained by three main case studies monitored during the PhD activities. The case study of the Santa Maria in Via Church in Camerino deal with the problem of dynamic identification, model updating and optimal sensor placement. Due to the complexity of the finite element model, model updating has been carried out with the aid of Particle Swarm Optimization algorithm. Thereafter, monitoring results of the r.c. school building in Camerino monitored during the 2016 seismic sequence are presented. Throughout the monitoring period, the response of the building to several low to medium intensity earthquakes was recorded. The building, despite the absence of damage, showed a time-varying dynamic behaviour making it difficult to track the frequencies during the seismic response. By applying a linearisation procedure, frequencies are tracked even during strong motions. Finally, the monitoring results of the Engineering Tower of the Università Politecnica delle Marche are reported. The Tower has been monitored since 2017 and, although with some interruptions, allowed the observation of a marked dependence of its eigen-frequencies on environmental parameters, especially temperature and wind. These effects have been effectively cleansed through the implementation of an artificial neural network.
GIOVANNELLI, ALESSANDRO. "Nonlinear forecasting using a large number of predictors". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1333.
Texto completoThis dissertation aims to introduce a nonlinear model to forecast macroeconomic time series using a large number of predictors, namely the Feedforward Neural Network - Dynamic Factor Model (FNN-DF). The technique used to summarize the predictors in a small number of factors is Generalized Dynamic Factor Model, while the method used to capture nonlinearity is artificial neural networks, specifically Feedforward Neural Network. Commonly in GDFM literature, forecasts are made using linear models. However linear techniques are often misspecified and the resulting forecasts provide only a poor approximation to the best possible forecast. In an effort to address this issue, the technique we propose is FNN-DF. To determine the practical usefulness of the model, we conducted several pseudo forecasting exercises on 8 series of the United States economy. The series we were interested in forecasting were grouped in real and nominal categories. This method was used to construct the forecasts at 1-, 3-, 6-, 9 and 12-month horizons for monthly U.S. economic variables using 131 predictors. The empirical study shows that FNN-DF has good ability to predict the variables under study in the period before the start of the "Great Moderation", namely 1984. After 1984, FNN-DF has the same accuracy in forecasting with respect to the benchmark.
Benatti, Serena. "Study and preparation of space missions for Asteroseismology". Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3423219.
Texto completoIl progetto di dottorato di ricerca presentato in questa tesi si propone di sfruttare il potenziale dell'Asterosismologia combinato con l'alta precisione fotometrica fornita dai satelliti spaziali, sia quelli gia' operativi che in fase di progettazione. Il satellite ESA-PLATO (PLAnetary Transits and Oscillations of stars) (Catala et al. 2008) e' stato proposto come uno strumento per la ricerca di pianeti extrasolari di prossima generazione, sfruttando l'analisi asterosismologica per la caratterizzazione della stella centrale del sistema planetario. Il presente lavoro include parte dello studio di fattibilita' di PLATO, con particolare attenzione all'analisi di immagini simulate, al fine di valutare la qualita' fotometrica del disegno ottico dei telescopi. Verra' quindi discussa la creazione di procedure per eseguire l'analisi sismica che permette di misurare gli osservabili asterosismologici che forniscono importanti informazioni riguardanti la struttura stellare. Infine siamo stati in grado di fissare i parametri fondamentali di alcune stelle attraverso il calcolo di modelli stellari teorici supportata da osservazioni dallo spazio con il satellite NASA-Kepler (Borucki et al. 2009). Nel quadro di Kepler e PLATO questi risultati sono di grande importanza, perche' la conoscenza dei parametri stellari e' l'unico modo per caratterizzare un pianeta extrasolare.
Zreik, Rawya. "Analyse statistique des réseaux et applications aux sciences humaines". Thesis, Paris 1, 2016. http://www.theses.fr/2016PA01E061/document.
Texto completoOver the last two decades, network structure analysis has experienced rapid growth with its construction and its intervention in many fields, such as: communication networks, financial transaction networks, gene regulatory networks, disease transmission networks, mobile telephone networks. Social networks are now commonly used to represent the interactions between groups of people; for instance, ourselves, our professional colleagues, our friends and family, are often part of online networks, such as Facebook, Twitter, email. In a network, many factors can exert influence or make analyses easier to understand. Among these, we find two important ones: the time factor, and the network context. The former involves the evolution of connections between nodes over time. The network context can then be characterized by different types of information such as text messages (email, tweets, Facebook, posts, etc.) exchanged between nodes, categorical information on the nodes (age, gender, hobbies, status, etc.), interaction frequencies (e.g., number of emails sent or comments posted), and so on. Taking into consideration these factors can lead to the capture of increasingly complex and hidden information from the data. The aim of this thesis is to define new models for graphs which take into consideration the two factors mentioned above, in order to develop the analysis of network structure and allow extraction of the hidden information from the data. These models aim at clustering the vertices of a network depending on their connection profiles and network structures, which are either static or dynamically evolving. The starting point of this work is the stochastic block model, or SBM. This is a mixture model for graphs which was originally developed in social sciences. It assumes that the vertices of a network are spread over different classes, so that the probability of an edge between two vertices only depends on the classes they belong to
RADICIONI, Tommaso. "All the ties that bind. A socio-semantic network analysis of Twitter political discussions". Doctoral thesis, Scuola Normale Superiore, 2021. http://hdl.handle.net/11384/109224.
Texto completoMAININI, LAURA. "Multidisciplinary and multi-fidelity optimization environment for wing integrated design". Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2500000.
Texto completoRONCALLO, LUCA. "Evolutionary spectral model for thunderstorm outflows and application to the analysis of the dynamic response of structures". Doctoral thesis, Università degli studi di Genova, 2022. http://hdl.handle.net/11567/1080956.
Texto completoChauvet, Pierre. "Elements d'analyse structurale des fai-k a 1 dimension". Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0070.
Texto completoLI, GUOHONG. "Variable Kinematic Finite Element Formulations Applied to Multi-layered Structures and Multi-field Problems". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729361.
Texto completoVolinsky, Christopher T. "Bayesian model averaging for censored survival models /". Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/8944.
Texto completoLi, Lingzhu. "Model checking for general parametric regression models". HKBU Institutional Repository, 2019. https://repository.hkbu.edu.hk/etd_oa/654.
Texto completoFILIPPIS, G. DE. "CALIBRATION OF THE GROUNDWATER FLOW MODEL AND ASSESSMENT OF THE SALTWATER INTRUSION IN A MULTI-LAYERED AQUIFER SYSTEM OF THE IONIAN COASTAL AREA (TARANTO GULF, SOUTHERN ITALY)". Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/362522.
Texto completoDa, Silva Frédéric. "Méthodologies de réduction de modèles multiphysiques pour la conception et la commande d’une chaîne de traction électrique". Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLC022/document.
Texto completoNumerical simulations are widely used during the design phase of a product but also for the validation of an innovative system. For example, during the conception of an electric vehicle’s powertrain, numerical simulations can be used to select the appropriate electric engine technology or for the development of control strategies taking into account decision criteria such as vehicle’s autonomy, but also its cost and performance.System’s complexity is always increasing, so they require more and more precise simulations in order to better understand the phenomena involved - for example to study iron losses in an electric engine. 3D simulations provide very accurate results to study a body but are still not appropriate today for the study of large scale systems (ie. with many degrees of freedom, many optimization parameters and several areas of Physics). Indeed, 3D simulations computing time cost is directly linked with the number of degrees of freedom. That’s why, in recent years, model order reduction techniques stir developments because they guarantee a good compromise between the computation time and accuracy of results produced by these models.In this study, we are interested in techniques that can be used in an industrial context around two axes: - the study of thermal phenomena (in the power electronics modules) - the study of electromagnetic phenomena (in electric engines)
DELLA, MARCA ROSSELLA. "Problemi di controllo in epidemiologia matematica e comportamentale". Doctoral thesis, Università degli studi di Modena e Reggio Emilia, 2021. http://hdl.handle.net/11380/1237622.
Texto completoDespite major achievements in eliminating long-established infections (as in the very well known case of smallpox), recent decades have seen the continual emergence or re-emergence of infectious diseases (last but not least COVID-19). They are not only threats to global health, but direct and indirect costs generated by human and animal epidemics are responsible for significant economic losses worldwide. Mathematical models of infectious diseases spreading have played a significant role in infection control. On the one hand, they have given an important contribution to the biological and epidemiological understanding of disease outbreak patterns; on the other hand, they have helped to determine how and when to apply control measures in order to quickly and most effectively contain epidemics. Nonetheless, in order to shape local and global public health policies, it is essential to gain a better and more comprehensive understanding of effective actions to control diseases, by finding ways to employ new complexity layers. This was the main focus of the research I have carried out during my PhD; the products of this research are collected and connected in this thesis. However, because out of context, other problems I interested in have been excluded from this collection: they rely in the fields of autoimmune diseases and landscape ecology. We start with an Introduction chapter, which traces the history of epidemiological models, the rationales and the breathtaking incremental advances. We focus on two critical aspects: i) the qualitative and quantitative assessment of control strategies specific to the problem at hand (via e.g. optimal control or threshold policies); ii) the incorporation into the model of the human behavioral changes in response to disease dynamics. In this framework, our studies are inserted and contextualized. Hereafter, to each of them a specific chapter is devoted. The techniques used include the construction of appropriate models given by non-linear ordinary differential equations, their qualitative analysis (via e.g. stability and bifurcation theory), the parameterization and validation with available data. Numerical tests are performed with advanced simulation methods of dynamical systems. As far as optimal control problems are concerned, the formulation follows the classical approach by Pontryagin, while both direct and indirect optimization methods are adopted for the numerical resolution. In Chapter 1, within a basic Susceptible-Infected-Removed model framework, we address the problem of minimizing simultaneously the epidemic size and the eradication time via optimal vaccination or isolation strategies. A two-patches metapopulation epidemic model, describing the dynamics of Susceptibles and Infected in wildlife diseases, is formulated and analyzed in Chapter 2. Here, two types of localized culling strategies are considered and compared: proactive and reactive. Chapter 3 concerns a model for vaccine-preventable childhood diseases transmission, where newborns vaccination follows an imitation game dynamics and is affected by awareness campaigns by the public health system. Vaccination is also incorporated in the model of Chapter 4. Here, it addresses susceptible individuals of any age and depends on the information and rumors about the disease. Further, the vaccine effectiveness is assumed to be partial and waning over time. The last Chapter 5 is devoted to the ongoing pandemic of COVID-19. We build an epidemic model with information-dependent contact and quarantine rates. The model is applied to the Italian case and explicitly incorporates the progressive lockdown restrictions.
VALLARINO, GIULIA. "A new formulation of ellagic acid and pomegranate peel extract for dietary supplementation in an animal model of multiple sclerosis". Doctoral thesis, Università degli studi di Genova, 2023. https://hdl.handle.net/11567/1105298.
Texto completoGARCIA, DE MIGUEL ALBERTO. "Hierarchical component-wise models for enhanced stress analysis and health monitoring of composites structures". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2729658.
Texto completoInzoli, S. "EXPERIMENTAL AND STATISTICAL METHODS TO IMPROVE THE RELIABILITY OF SPECTRAL INDUCED POLARIZATION TO INFER LITHO-TEXTURAL PROPERTIES OF ALLUVIAL SEDIMENTS". Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/360596.
Texto completoPáleník, Petr. "Lávka pro pěší přes rychlostní komunikaci". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226444.
Texto completoNARBAEV, TIMUR. "Forecasting cost at completion with growth models and Earned Value Management". Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2506248.
Texto completoLipkovich, Ilya A. "Bayesian Model Averaging and Variable Selection in Multivariate Ecological Models". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/11045.
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Wang, Ning. "Price sensitivity to the exponent in the CEV model". Thesis, Uppsala universitet, Analys och tillämpad matematik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-180977.
Texto completoDAGNES, NICOLE. "3D Human Face Analysis for recognition applications and motion capture". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2790163.
Texto completoBillah, Baki 1965. "Model selection for time series forecasting models". Monash University, Dept. of Econometrics and Business Statistics, 2001. http://arrow.monash.edu.au/hdl/1959.1/8840.
Texto completoREGNI, MARCO. "The Role of Soil-Structure Interaction in Interpretation of Vibration Measurements on Continuous Viaducts". Doctoral thesis, Università Politecnica delle Marche, 2019. http://hdl.handle.net/11566/263550.
Texto completoThe scope of this thesis is to identify the significance of soil-structure interaction (SSI) and site response on the dynamic behaviour of continuous multi-span reinforced concrete viaducts, based on ambient vibration tests (AVTs) and numerical simulations with finite element models. For this purpose, a long bridge located in Central Italy, founded on piles in eluvial-colluvial soil deposit was instrumented and AVTs together with geophysical investigations were performed. Experimental modal properties were evaluated by means of operational modal analysis on recorded data and the role of SSI in the interpretation of the tests was detected by means of finite element models characterised by different accuracy in addressing the interaction problem. In the SSI models the local site condition in correspondence with each bridge piers were considered in the definition of soil-foundations impedances. Comparison between the experimental results obtained from AVTs on the free-field and on the viaduct deck, permits the identification of both predominant period of the site and the fundamental periods of the structure. In addition, comparisons between results obtained from the different numerical models with the measured dynamic response of the viaduct, in terms of fundamental frequencies and mode shapes, allow the identification of the contribution of different SSI aspects such as the pile-soil-pile interaction, the radiation problem, the pile cap embedment as well as the variability of the soil stratigraphy along the longitudinal direction of the viaduct. About the transverse behaviour, some tests were performed in correspondence with one pier, measuring accelerations of the foundation cap and the pier bent, to identify the contribution to the transverse modal displacement due to the elastic deflection of the pier and the foundation rocking. In addition, other two viaducts, with different characteristics respect to the previous one, were presented, for extending the study of SSI.
SCOZZESE, FABRIZIO. "AN EFFICIENT PROBABILISTIC FRAMEWORK FOR SEISMIC RISK ANALYSIS OF STRUCTURAL SYSTEMS EQUIPPED WITH LINEAR AND NONLINEAR VISCOUS DAMPERS". Doctoral thesis, Università degli Studi di Camerino, 2018. http://hdl.handle.net/11581/429547.
Texto completoRen, Zhen. "Modular model assembly from finite element models of components". Diss., Connect to online resource - MSU authorized users, 2008.
Buscar texto completoHUSSAIN, RADI RADI MOHAMMED ABDUL. "Structural construction and economic benefits for precast concrete high-rise housing buildings". Doctoral thesis, Università Politecnica delle Marche, 2016. http://hdl.handle.net/11566/242978.
Texto completoPrecast concrete technology is considered one of the greatest importance systems in multifamily housing buildings. The concept of manufacturing, production and construction makes this technology different from cast in place concrete and often more interesting and befitting. The objective of this thesis is to investigate the possibilities and capabilities of the precast concrete technology in terms of structural performance and construction cost of high-rise housing buildings, to ensure the optimal use of this technology to solve the housing crisis in the Middle East and the areas affected by natural disasters and wars. The study includes a review of the most widely systems used in this field such as the precast concrete frame systems and large panel system, which therefore have been studied intensively by considering real cases. The practical applications and experiences of housing projects and real case studies, additional to the codes, are considered the important parts of this thesis. Comparison between precast concrete systems are conducted to find out the suitable system; the comparison depends on the characteristics, rules and constraints for each system. In order to compare different precast structural housing systems for a number of case studies, the seismic performance and the construction costs are assumed as criteria for the assessment and selection of the system. The seismic performance is obtained with push-over non linear analyses, whereas the construction cost is estimated to total cost for each case study; the results obtained for various case studies are then compared. Precast concrete frame structural systems represent a suitable solution for the high rise housing buildings in terms of seismic performance and construction cost. Furthermore, the results showed that this system is a good economic alternative for the structural buildings not only in the non-seismic or low seismic areas but also in high seismicity areas.
Jawaid, Hassan. "Applications of the Heath, Jarrow and Morton (HJM) model to energy markets". Thesis, Uppsala universitet, Analys och tillämpad matematik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176611.
Texto completoTELESCA, ALESSIO. "ADVANCED MODELLING OF OVER-STROKE DISPLACEMENT CAPACITY FOR CURVED SURFACE SLIDER DEVICES". Doctoral thesis, Università degli studi della Basilicata, 2022. http://hdl.handle.net/11563/153765.
Texto completoGandy, Axel. "Directed model checks for regression models from survival analysis". Berlin Logos-Ver, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2766731&prov=M&dok_var=1&dok_ext=htm.
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