Bibliografie tematiche / Sequential propagation

Letteratura scientifica selezionata sul tema "Sequential propagation"

Autore: Grafiati
Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Sequential propagation":

1

Hui, Hui, Dayou Liu e Yafei Wang. "Sequential back-propagation". Journal of Computer Science and Technology 9, n. 3 (luglio 1994): 252–60. http://dx.doi.org/10.1007/bf02939506.

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Cavallera, P., C. Landrault, S. Pravossoudovitch e P. Girard. "Delay fault propagation in synchronous sequential circuits". Electronics Letters 30, n. 10 (12 maggio 1994): 765–67. http://dx.doi.org/10.1049/el:19940538.

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Papanastasiou, Yiangos. "Fake News Propagation and Detection: A Sequential Model". Management Science 66, n. 5 (maggio 2020): 1826–46. http://dx.doi.org/10.1287/mnsc.2019.3295.

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Kfir, Haggai, e Ido Kanter. "Parallel versus sequential updating for belief propagation decoding". Physica A: Statistical Mechanics and its Applications 330, n. 1-2 (dicembre 2003): 259–70. http://dx.doi.org/10.1016/j.physa.2003.08.015.

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MacKernan, Donal, Raymond Kapral e Giovanni Ciccotti. "Sequential short-time propagation of quantum classical dynamics". Journal of Physics: Condensed Matter 14, n. 40 (26 settembre 2002): 9069–76. http://dx.doi.org/10.1088/0953-8984/14/40/301.

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Nagaki, Aiichiro, Yiyuan Jiang, Yosuke Ashikari e Kaiteng Guan. "Accelerating Heat-Initiated Radical Reactions of Organic Halides with Tin Hydride Using Flow Microreactor Technologies". Synlett 31, n. 19 (9 ottobre 2020): 1937–41. http://dx.doi.org/10.1055/s-0040-1707307.

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AbstractWe herein report that flow microreactors can promote an efficiency of radical chain reactions. The chain reactions with a fast propagation step can be accelerated by virtue of an efficient heat-transfer character of the microreactors, whereas the yield of those reactions with a slow propagation step was increased by flow microreactors. Moreover, the yield was further increased by a sequential addition of the initiators, which was allowed by a flow-sequential-addition system.
7

Zheng, Peng, Tuan Gu, Erhu Liu, Ming Zhao e Desheng Zhou. "Simulation of Fracture Morphology during Sequential Fracturing". Processes 10, n. 5 (9 maggio 2022): 937. http://dx.doi.org/10.3390/pr10050937.

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During hydraulic fracturing, the aperture of hydraulic fractures will shrink by the in-situ stress, but will not fully close because of the existence of proppant inside the fracture. In previous studies, few people noticed the existence of proppant, which has resulted in the inaccuracy of simulation results. In this study, based on the boundary element method, a numerical simulation model for sequential fracturing was established, which respectively considered the influence of proppant in staged fracturing and zipper fracturing. In addition, the influence mechanism of proppant on fracture morphology is then revealed. Simulation results show that the residual aperture of the previous hydraulic fracture, which was produced by proppant, may increase with the increase of proppant stiffness and fracture spacing and may also be shrunk by the dynamic propagation of subsequent hydraulic fracture. However, the residual aperture will rebound after hydraulic fracturing construction is finished. The shrinkage and rebound values of residual aperture of hydraulic fracture are usually less than 1 mm. In addition, at the same time, the residual aperture of previous hydraulic fracture may also influence the propagation of subsequent hydraulic fracture. These influences are represented by the bend of fractures in multistage fracturing and the intersection in zipper fracturing. With the increase of well spacing, the influence degree of residual aperture on subsequent fracture propagation is reduced. The previous hydraulic fracture cannot have a significant effect on the deflection of subsequent hydraulic fracture when fracture spacing is between 10 and 30 m. The above research has important guiding significance for controlling fracture morphology in hydraulic fracturing.
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Cai, Shuo, Fei Yu e Yiqun Yang. "Analysis of SET pulses propagation probabilities in sequential circuits". IOP Conference Series: Materials Science and Engineering 351 (maggio 2018): 012010. http://dx.doi.org/10.1088/1757-899x/351/1/012010.

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Guan, J., e J. H. Graham. "Diagnostic reasoning with fault propagation digraph and sequential testing". IEEE Transactions on Systems, Man, and Cybernetics 24, n. 10 (1994): 1552–58. http://dx.doi.org/10.1109/21.310538.

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Hernandez-Fajardo, Isaac, e Leonardo Dueñas-Osorio. "Sequential Propagation of Seismic Fragility across Interdependent Lifeline Systems". Earthquake Spectra 27, n. 1 (febbraio 2011): 23–43. http://dx.doi.org/10.1193/1.3544052.

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Realistic models of service networks must consider the evolution of interactions with external systems to evaluate emergent response effects on individual network performance. This paper introduces a new dynamic methodology for the assessment of systemic fragility propagation across interdependent networks subjected to seismic action that improves existing static methodologies. Interdependencies are discrete, unidirectional relationships between elements of distinct networks, which are able to influence response evolution from transient to steady-state stages. Comparisons of systemic fragility curves results for isolated and interdependent power and water networks display the importance of interdependence strength and density properties. For the test water network, inter-systemic failure propagation increases its connectivity loss by up to 24%, while high interdependence strengths make the median fragility rise up to 56.2%. In contrast, reductions of interdependence density improve the median water fragility up to 81.7%. Insights obtained from this model, and its associated sequential fragility algorithm, reveal complex coupling patterns and interdependence-based mitigation strategies that are essential for lifeline system management.
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Ti possono interessare anche gli elenchi estesi di opere sul tema "Sequential propagation":
Articoli di riviste

Tesi sul tema "Sequential propagation":

1

Nair, Rajesh. "On improving parallel pattern single fault propagation for synchronous sequential circuits". Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06302009-040508/.

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Roungos, Ioannis C. "The effect of sequential action of corrosion and fatigue on fatigue crack initiation and propagation in 2024-T3 aluminium alloy". Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/11122.

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The influence of sequential action of corrosion and fatigue on fatigue behaviour of 2024- T3 aluminium alloy was investigated. EXCO solution was used for corrosion development. Corrosion evolution and penetration were investigated in terms of exposure time, dimensional characteristics, orientation, microstructure of material, incremental corrosion application and sequential application of corrosion and fatigue. Single Edge Notch Tensile specimens were used in the fatigue-corrosion tests. Fatigue intervals were interrupted by corrosion application. Four fatigue intervals and four corrosion segment times were incorporated in the test matrix. The results of fatigue ínitiation, propagation and total life were compared to the virgin and pre-corroded materials' behaviour. The main mechanisms of crack acceleration and arrest were identified and discussed relative to the morphology of corrosion development. Finally a comparison was tried between the experimental lives and the predicted ones, calculated from two crack growth packages using the most conservative approach.
3

Roungos, I. C. "The effect of sequential action of corrosion and fatigue on fatigue crack initiation and propagation in 2024-T3 aluminium alloy". Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/11122.

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The influence of sequential action of corrosion and fatigue on fatigue behaviour of 2024- T3 aluminium alloy was investigated. EXCO solution was used for corrosion development. Corrosion evolution and penetration were investigated in terms of exposure time, dimensional characteristics, orientation, microstructure of material, incremental corrosion application and sequential application of corrosion and fatigue. Single Edge Notch Tensile specimens were used in the fatigue-corrosion tests. Fatigue intervals were interrupted by corrosion application. Four fatigue intervals and four corrosion segment times were incorporated in the test matrix. The results of fatigue ínitiation, propagation and total life were compared to the virgin and pre-corroded materials' behaviour. The main mechanisms of crack acceleration and arrest were identified and discussed relative to the morphology of corrosion development. Finally a comparison was tried between the experimental lives and the predicted ones, calculated from two crack growth packages using the most conservative approach.
4

Dijamentiuk, Alexis. "Propagation de communautés bactériennes : modelage, stabilisation et sélection pour la biopréservation". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0124.

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Les découvertes récentes sur les communautés microbiennes, ou microbiotes, ont révélé un potentiel biotechnologique considérable dans divers domaines. Ils sont considérés comme essentiels pour accélérer l'innovation dans les systèmes de production alimentaire. Toutefois, les procédés existants ne sont pas adaptés à la culture des microbiotes. La difficulté que représente la culture de microbiotes a notamment pour origine la capacité des microorganismes à interagir par compétition, qui peut conduire à la réduction indésirable de la biodiversité au sein du réacteur de culture. Ce phénomène peut aboutir à l'obtention de communautés qui ne présentent pas les fonctionnalités souhaitées. L'objectif de cette thèse est d'étudier l'influence de la propagation de microbiotes en condition contrôlée sur leur structure et leur fonction. Les travaux de cette thèse ont permis de développer et de déterminer la performance d'un procédé excluant la compétition microbienne pour la culture de communautés bactériennes. La stratégie choisie repose sur le micro-confinement et la ségrégation spatiale des bactéries au sein d'un bouillon de culture structuré en émulsion inverse. Après avoir étudié l'effet de la culture en émulsion inverse sur la croissance de bactéries individuelles, les travaux ont comparé son effet sur la dynamique de communautés propagées selon un régime séquentiel, ou backslopping, avec celui exercé par un système classique non-émulsionné. Les résultats ont montré que l'utilisation d'une émulsion inverse conduit à la génération de nouvelles structures de communautés au cours de la propagation, et que l'utilisation de la culture classique conduit à leur stabilisation. Les comportements différents issus de ces deux systèmes de culture en font des outils complémentaires pour le modelage et la propagation de communautés microbiennes. Enfin, l'effet de la propagation sur la variabilité fonctionnelle de communautés a été étudiée dans un contexte de biopréservation. Le criblage de microbiotes de laits crus propagés a montré qu'ils se différenciaient en termes de robustesse et de reproductibilité de leur activité anti-Listeria, justifiant de tenir compte de la variabilité fonctionnelle des communautés pour leur sélection dans un contexte d'ingénierie de microbiotes
Recent discoveries about microbial communities, or microbiota, have revealed considerable biotechnological potential in a variety of fields. They are considered essential to accelerate innovation in food production systems. However, existing processes are not adapted to the cultivation of microbiota. One major barrier to community propagation is competition between microorganisms, which can lead to an undesirable reduction in biodiversity within the culture reactor. This phenomenon can lead to communities that lack the desired functionality. The objective of this thesis was to study the influence of microbiota propagation, under controlled conditions, on their structure and function. During this work, a process of microbial culture excluding microbial competition for the propagation of bacterial communities was developed. The chosen strategy is based on the micro-confinement and spatial segregation of bacteria within a broth structured as an invert emulsion. The effect of the invert emulsion culture on the growth of individual bacteria was studied, then the effect of this system on the dynamics of communities propagated according to a sequential regime, or backslopping, as well as that exerted by a conventional non-emulsified system was investigated. The results showed that the use of an inverse emulsion leads to the generation of new community structures during propagation, and that the use of the classical culture leads to their stabilization. The different behaviors of these two culture systems make them complementary tools for the modeling and the propagation of microbial communities. Finally, the effect of propagation on the functional variability of communities was studied in a biopreservation context. The screening of propagated raw milk microbiota showed that they differed in terms of robustness and reproducibility of anti-Listeria activity, emphasizing the need to take into account the functional variability of communities when selecting communities of interest for microbiota engineering
5

López, Pintor Darío. "Theoretical and experimental study on the autoignition phenomena of homogeneous reactive mixtures". Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/90642.

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The main objective of this Thesis is the study of the autoignition phenomenon of reactive mixtures from a theoretical and experimental point of view. A wide parametric study has been carried out in a Rapid Compression-Expansion Machine (RCEM) for different initial temperatures, compression ratios, equivalence ratios and molar fractions of oxygen (by using synthetic EGR) for different fuels. The ignition delay referred to cool flames (if it can be identified), as well as the ignition delay referred to the high-temperature stage of the ignition, have been experimentally obtained and their trends have been explained regarding the chemical kinetics of each fuel. The different effects of the species that compose the synthetic EGR on the ignition delay have been studied, decoupling the thermodynamic effects from the chemical ones. Different compositions have been taken into account to generate the synthetic EGR, and validation limits have been obtained for each mixture. The thermodynamic and the chemical effects have shown to be opposed, while the dominant one is different depending on the working temperature. Several chemical kinetic mechanisms have been validated by comparison to the experimental results. A detailed mechanism for iso-octane and n-heptane blends and a reduced mechanisms for n-dodecane have been analyzed. Moreover, a sub-model for the generation and decay of excited OH* has been validated by comparison to chemiluminescence and spectroscopy results. The different radiation sources have been studied for iso-octane and n-heptane by means of spectroscopy techniques. Besides, chemiluminescence measurements filtered at 310nm (OH* emission wavelength) have been performed in order to analyze the generalization and propagation velocity of the autoignition front. The ignition propagation has shown to depend on the thermodynamic conditions reached in the combustion chamber when the first ignition spot occurs and not on the global reactivity of the mixture. Furthermore, two different radiation sources have been found at 310nm in the spectroscopic analysis depending on the ignition intensity: the decay of the OH* radical from excited to ground state and the oxidation of CO to CO2 (CO continuum). However, these optical techniques have been applied only in the experiments carried out with iso-octane and n-heptane due to technical limitations. Finally, a new predictive model has been theoretically developed starting from the Glassman's model for autoignition. This method is based on modeling the accumulation rate of chain carriers up to reach their critical concentration (obtaining the ignition delay referred to cool flames) and, afterwards, modeling the disappearance rate of such chain carriers up to their consumption (when the maximum heat release rate is reached, obtaining the ignition delay referred to the high-temperature stage of the process). The predictive capability of the model has been compared to the ability of other methods that can be found in the literature, such as the Livengood & Wu integral method. The validity of each method has been tested, defining a working methodology to obtain reasonable predictions for the ignition delay.
El objetivo de esta Tesis Doctoral es el estudio del fenómeno de autoencendido de mezclas reactivas desde un punto de vista teórico y experimental. Se ha realizado un amplio estudio paramétrico en una Máquina de Compresión-Expansión Rápida (RCEM por sus siglas en inglés) barriendo diversas temperaturas iniciales, relaciones de compresión, dosados relativos y fracciones molares de oxígeno (mediante el uso de EGR sintético) para distintos combustibles. El tiempo de retraso del fenómeno de llamas frías (en el caso de existir), así como el tiempo de retraso de la etapa de alta temperatura, han sido obtenidos experimentalmente y sus tendencias explicadas mediante cinética química. Se han estudiado los diferentes efectos de las distintas especies involucradas en el EGR sintético sobre el tiempo de retraso, desligando aquellos de carácter termodinámico de los efectos puramente químicos. Se han tenido en cuenta distintas composiciones para definir dicho EGR, estableciendo límites de validez para cada una de las mezclas propuestas. Los efectos termodinámicos y químicos resultaron ser opuestos, siendo dominante uno u otro a distintos rangos de temperatura de trabajo. Varios mecanismos de cinética química han sido validados gracias a los resultados experimentales obtenidos. Además de un mecanismo detallado para mezclas PRF de iso-octano y n-heptano, se ha llevado a cabo la validación de otro mecanismo simplificado para el n-dodecano. Por otro lado, un submodelo de formación y decaimiento de OH* excitado ha sido validado contra resultados de quimioluminiscencia y espectroscopía. Se han estudiado las diferentes fuentes de radiación del proceso de autoencendido para el iso-octano y el n-heptano mediante técnicas de espectroscopía. Además, se han realizado medidas de quimioluminiscencia filtrada a 310nm (longitud de onda de emisión del radical OH*) para el análisis de la generalización y velocidad de propagación del frente de autoencendido. La propagación del encendido ha mostrado ser dependiente de las condiciones termodinámicas alcanzadas en la cámara de combustión en el instante de ignición más que de la reactividad de la mezcla. Se han encontrado dos fuentes de radiación distintas a 310nm mediante espectroscopía, dependiendo de la intensidad del encendido: el decaimiento del radical OH* de estado excitado a estado natural y la oxidación del CO a CO2 (continuo del CO). No obstante, estas técnicas han sido utilizadas solamente para los dos combustibles de referencia de la escala de octanaje debido a limitaciones técnicas. Finalmente, se ha desarrollado un nuevo modelo predictivo de manera teórica partiendo del modelo de Glassman para el autoencendido. Este método se basa en modelar primero la tasa de acumulación de portadores de cadena hasta su concentración crítica (obteniendo así el tiempo de retraso referido a la etapa de llamas frías) y, tras dicho instante, modelar la tasa de consumo de dichos portadores de cadena hasta su completa desaparición (instante en el cual se produce la máxima exotermia del proceso, prediciendo el tiempo de retraso referido a la etapa de alta temperatura del encendido). La capacidad predictiva del modelo ha sido comprobada para cada uno de los seis combustibles ensayados. Además, dicha capacidad predictiva ha sido comparada con la de otros métodos existentes en la literatura, como la integral de Livengood & Wu. La validez de cada uno de los métodos ha sido analizada, definiendo una metodología de uso para obtener predicciones razonables del tiempo de retraso.
L'objectiu d'aquesta Tesi Doctoral és l'estudi del fenomen d'autoencesa de mescles reactives des d'un punt de vista teòric i experimental. S'ha realitzat un ampli estudi paramètric en una Màquina de Compressió-Expansió Ràpida (RCEM per les seues sigles en anglès) cobrint diverses temperatures inicials, relacions de compressió, dosatges relatius i fraccions molars d'oxigen (mitjançant l'ús de EGR sintètic) per a diferents combustibles. El temps de retard del fenomen de flames fredes (en el cas d'existir), així com el temps de retard de l'etapa d'alta temperatura, han sigut obtinguts experimentalment i les seues tendències explicades mitjançant cinètica química. S'han estudiat els diferents efectes de les diferents espècies involucrades en l'EGR sintètic sobre el temps de retard, deslligant aquells de caràcter termodinàmic dels efectes purament químics. S'han tingut en compte diferents composicions per a definir aquest EGR, establint límits de validesa per a cadascuna de les mescles proposades. Els efectes termodinàmics i químics van resultar ser oposats, sent dominant un o un altre a diferents rangs de temperatura de treball. Diversos mecanismes de cinètica química han sigut validats gràcies als resultats experimentals obtinguts. A més d'un mecanisme detallat per a mescles PRF d'iso-octà i n-heptà, s'ha dut a terme la validació d'un altre mecanisme simplificat per al n-dodecà. D'altra banda, un submodel de formació i decaïment d'OH* excitat ha sigut validat contra resultats de quimioluminescència i espectroscopía. S'han estudiat les diferents fonts de radiació del procés d'autoencesa per a l'iso-octà i l'n-heptà mitjançant tècniques d'espectroscopía. A més, s'han realitzat mesures de quimioluminescència filtrada a 310nm (longitud d'ona d'emissió del radical OH*) per a l'anàlisi de la generalització i velocitat de propagació del front d'autoencesa. La propagació de l'encesa ha mostrat ser depenent de les condicions termodinàmiques aconseguides en la cambra de combustió en l'instant d'ignició més que de la reactivitat de la mescla. S'han trobat dues fonts de radiació diferents a 310nm mitjançant espectroscopía, depenent de la intensitat de l'encesa: el decaïment del radical OH* d'estat excitat a estat natural i l'oxidació del CO a CO2 (continu del CO). No obstant açò, aquestes tècniques han sigut utilitzades solament per als dos combustibles de referència de l'escala de octanaje a causa de limitacions tècniques. Finalment, s'ha desenvolupat un nou model predictiu de manera teòrica partint del model de Glassman per a l'autoencesa. Aquest mètode es basa a modelar primer la taxa d'acumulació de portadors de cadena fins a la seua concentració crítica (obtenint així el temps de retard referit a l'etapa de flames fredes) i, després d'aquest instant, modelar la taxa de consum d'aquests portadors de cadena fins a la seua completa desaparició (instant en el qual es produeix la màxima exotermia del procés, predient el temps de retard referit a l'etapa d'alta temperatura de l'encesa). La capacitat predictiva del model ha sigut comprovada per a cadascun dels sis combustibles assajats. A més, aquesta capacitat predictiva ha sigut comparada amb la d'altres mètodes existents en la literatura, com la integral de Livengood & Wu. La validesa de cadascun dels mètodes ha sigut analitzada, definint una metodologia d'ús per a obtenir prediccions raonables del temps de retard.
López Pintor, D. (2017). Theoretical and experimental study on the autoignition phenomena of homogeneous reactive mixtures [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/90642
TESIS
6

Taminato, Filipe Otsuka. "Aperfeiçoamento do algoritmo algébrico sequencial para a identificação de variações abruptas de impedância acústica via otimização". Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6834.

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Fundação Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro
Neste trabalho são utilizados a técnica baseada na propagação de ondas acústicas e o método de otimização estocástica Luus-Jaakola (LJ) para solucionar o problema inverso relacionado à identificação de danos em barras. São apresentados o algoritmo algébrico sequencial (AAS) e o algoritmo algébrico sequencial aperfeiçoado (AASA) que modelam o problema direto de propagação de ondas acústicas em uma barra. O AASA consiste nas modificações introduzidas no AAS. O uso do AASA resolve com vantagens o problema de identificação de danos com variações abruptas de impedância. Neste trabalho são obtidos, usando-se o AAS-LJ e o AASA-LJ, os resultados de identificação de cinco cenários de danos. Três deles com perfil suave de impedância acústica generalizada e os outros dois abruptos. Além disso, com o objetivo de simular sinais reais de um experimento, foram introduzidos variados níveis de ruído. Os resultados alcançados mostram que o uso do AASA-LJ na resolução de problemas de identificação de danos em barras é bastante promissor, superando o AAS-LJ para perfis abruptos de impedância.
In this work the techniques based on the wave propagation approach and the Luus- Jaakola optimization method to solve the inverse problem of damage identification in bars are applied. The sequential algebraic algorithm (SAA) and the improved sequential algebraic algorithm (ISAA) that model the direct problem of acoustic wave propagation in bars are presented. The ISAA consists on modifications of the SAA. The use of the ISAA solves with advantages the problem of damage identification when the generalized acoustical impedance variations are abrupt. In this work the results of identification of five damage scenarios are obtained using the SAA and the ISAA. Three of them are smooth impedance profiles and the other two are rough ones. Moreover, to simulate signals obtained experimentally, different noise levels were introduced. It is shown that using the ISAA-LJ in solving problems of damage identification in bars is quite promising, furnishing better results than the SAA-LJ, specially when the impedance profiles are abrupt.
7

Raillon, Loic. "Experimental identification of physical thermal models for demand response and performance evaluation". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI039.

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La stratégie de l’Union Européenne pour atteindre les objectifs climatiques, est d’augmenter progressivement la part d’énergies renouvelables dans le mix énergétique et d’utiliser l’énergie plus efficacement de la production à la consommation finale. Cela implique de mesurer les performances énergétiques du bâtiment et des systèmes associés, indépendamment des conditions climatiques et de l’usage, pour fournir des solutions efficaces et adaptées de rénovation. Cela implique également de connaître la demande énergétique pour anticiper la production et le stockage d’énergie (mécanismes de demande et réponse). L’estimation des besoins énergétiques et des performances énergétiques des bâtiments ont un verrou scientifique commun : l’identification expérimentale d’un modèle physique du comportement intrinsèque du bâtiment. Les modèles boîte grise, déterminés d’après des lois physiques et les modèles boîte noire, déterminés heuristiquement, peuvent représenter un même système physique. Des relations entre les paramètres physiques et heuristiques existent si la structure de la boîte noire est choisie de sorte qu’elle corresponde à la structure physique. Pour trouver la meilleure représentation, nous proposons d’utiliser, des simulations de Monte Carlo pour analyser la propagation des erreurs dans les différentes transformations de modèle et, une méthode de priorisation pour classer l’influence des paramètres. Les résultats obtenus indiquent qu’il est préférable d’identifier les paramètres physiques. Néanmoins, les informations physiques, déterminées depuis l’estimation des paramètres, sont fiables si la structure est inversible et si la quantité d’information dans les données est suffisante. Nous montrons comment une structure de modèle identifiable peut être choisie, notamment grâce au profil de vraisemblance. L’identification expérimentale comporte trois phases : la sélection, la calibration et la validation du modèle. Ces trois phases sont détaillées dans le cas d’une expérimentation d’une maison réelle en utilisant une approche fréquentiste et Bayésienne. Plus précisément, nous proposons une méthode efficace de calibration Bayésienne pour estimer la distribution postérieure des paramètres et ainsi réaliser des simulations en tenant compte de toute les incertitudes, ce qui représente un atout pour le contrôle prédictif. Nous avons également étudié les capacités des méthodes séquentielles de Monte Carlo pour estimer simultanément les états et les paramètres d’un système. Une adaptation de la méthode de prédiction d’erreur récursive, dans une stratégie séquentielle de Monte Carlo, est proposée et comparée à une méthode de la littérature. Les méthodes séquentielles peuvent être utilisées pour identifier un premier modèle et fournir des informations sur la structure du modèle sélectionnée pendant que les données sont collectées. Par la suite, le modèle peut être amélioré si besoin, en utilisant le jeu de données et une méthode itérative
The European Union strategy for achieving the climate targets, is to progressively increase the share of renewable energy in the energy mix and to use the energy more efficiently from production to final consumption. It requires to measure the energy performance of buildings and associated systems, independently of weather conditions and user behavior, to provide efficient and adapted retrofitting solutions. It also requires to known the energy demand to anticipate the energy production and storage (demand response). The estimation of building energy demand and the estimation of energy performance of buildings have a common scientific: the experimental identification of the physical model of the building’s intrinsic behavior. Grey box models, determined from first principles, and black box models, determined heuristically, can describe the same physical process. Relations between the physical and mathematical parameters exist if the black box structure is chosen such that it matches the physical ones. To find the best model representation, we propose to use, Monte Carlo simulations for analyzing the propagation of errors in the different model transformations, and factor prioritization, for ranking the parameters according to their influence. The obtained results show that identifying the parameters on the state-space representation is a better choice. Nonetheless, physical information determined from the estimated parameters, are reliable if the model structure is invertible and the data are informative enough. We show how an identifiable model structure can be chosen, especially thanks to profile likelihood. Experimental identification consists of three phases: model selection, identification and validation. These three phases are detailed on a real house experiment by using a frequentist and Bayesian framework. More specifically, we proposed an efficient Bayesian calibration to estimate the parameter posterior distributions, which allows to simulate by taking all the uncertainties into account, which is suitable for model predictive control. We have also studied the capabilities of sequential Monte Carlo methods for estimating simultaneously the states and parameters. An adaptation of the recursive prediction error method into a sequential Monte Carlo framework, is proposed and compared to a method from the literature. Sequential methods can be used to provide a first model fit and insights on the selected model structure while the data are collected. Afterwards, the first model fit can be refined if necessary, by using iterative methods with the batch of data
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Carvalho, Marcelo de Rezende. "Computational Framework for Fracture Simulation of Concrete Structures until Failure". Thesis, University of Sydney, 2019. https://hdl.handle.net/2123/23283.

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The need to predict the fractured behaviour of a structure with a high degree of certainty is becoming a significant problem in the construction industry, whether for designing new structures or for assessing and strengthening existing structures. Considerable advances in the construction industry – with the introduction of new materials and technologies and constant demand for safer, more cost-efficient, sustainable and bold designs – are overturning established design rules. It is becoming critical to bring new predictive tools to assure the safety and serviceability of these structures, and to accomplish the full potential of the new construction designs that are now becoming possible. This research developed a computational framework based on the discrete crack approach that can be efficiently used in engineering for the reliable simulation of the behaviour of concrete structures. The framework is built on an object-oriented finite element platform, specifically tailored to accommodate embedded strong discontinuities, and having tools to improve the simulation of discrete models, such as a non-iterative solution algorithm and a powerful direct sparse solver. Different new formulations are proposed for simulating and capturing crack propagation with embedded discontinuities, which: i) are based on local degrees of freedom, ii) are combined with embedded steel fibres, and iii) require minimum enhanced global degrees of freedom. Multiple case studies are performed for the validation of the new proposed techniques against important laboratory benchmark tests. The framework enables a close-to-reality prediction of the structural behaviour of plain, steel reinforced, and steel fibre reinforced concrete, with improved performance and without convergence issues in fracture simulations.
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Cheng, Po-Wei, e 鄭柏偉. "Deep Learning Aided Sequential Reliability-Boosting Belief Propagation List Decoding for Polar Codes". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/unh865.

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Boddikurapati, Sirish. "Sequential Monte Carlo Methods With Applications To Communication Channels". 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7537.

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Estimating the state of a system from noisy measurements is a problem which arises in a variety of scientific and industrial areas which include signal processing, communications, statistics and econometrics. Recursive filtering is one way to achieve this by incorporating noisy observations as they become available with prior knowledge of the system model. Bayesian methods provide a general framework for dynamic state estimation problems. The central idea behind this recursive Bayesian estimation is computing the probability density function of the state vector of the system conditioned on the measurements. However, the optimal solution to this problem is often intractable because it requires high-dimensional integration. Although we can use the Kalman lter in the case of a linear state space model with Gaussian noise, this method is not optimum for a non-linear and non-Gaussian system model. There are many new methods of filtering for the general case. The main emphasis of this thesis is on one such recently developed filter, the particle lter [2,3,6]. In this thesis, a detailed introduction to particle filters is provided as well as some guidelines for the efficient implementation of the particle lter. The application of particle lters to various communication channels like detection of symbols over the channels, capacity calculation of the channel are discussed.

Libri sul tema "Sequential propagation":

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United States. National Aeronautics and Space Administration., a cura di. Study of one- and two-dimensional filtering and deconvolution algorithms for a streaming array computer: Final report. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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2

United States. National Aeronautics and Space Administration., a cura di. Study of one- and two-dimensional filtering and deconvolution algorithms for a streaming array computer: Final report, appendix 5. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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3

United States. National Aeronautics and Space Administration., a cura di. Study of one- and two-dimensional filtering and deconvolution algorithms for a streaming array computer: Final report, appendix 5. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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United States. National Aeronautics and Space Administration., a cura di. Study of one- and two-dimensional filtering and deconvolution algorithms for a streaming array computer: Final report : [appendices]. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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Boden, Margaret A. 4. Artificial neural networks. Oxford University Press, 2018. http://dx.doi.org/10.1093/actrade/9780199602919.003.0004.

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Artificial neural networks (ANNs) are made up of many interconnected units, each one capable of computing only one thing. ANNs have myriad applications, from playing the stock market and monitoring currency fluctuations to recognizing speech or faces. ANNs are parallel-processing virtual machines implemented on classical computers. They are intriguing partly because they are very different from the virtual machines of symbolic AI. Sequential instructions are replaced by massive parallelism, top-down control by bottom-up processing, and logic by probability. ‘Artificial neural networks’ considers the wider implications of ANNs and discusses parallel distributed processing (PDP), learning in neural networks, back-propagation, deep learning, and hybrid systems.
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Study of one- and two-dimensional filtering and deconvolution algorithms for a streaming array computer: Final report : [appendices]. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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7

Study of one- and two-dimensional filtering and deconvolution algorithms for a streaming array computer: Final report. [Washington, D.C: National Aeronautics and Space Administration, 1985.

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Capitoli di libri sul tema "Sequential propagation":

1

Liang, Wei, Yunde Jia e Cheng Ge. "Visual Hand Tracking Using Nonparametric Sequential Belief Propagation". In Lecture Notes in Computer Science, 679–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11538059_71.

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Du, Wei, e Justus Piater. "Multi-view Object Tracking Using Sequential Belief Propagation". In Computer Vision – ACCV 2006, 684–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11612032_69.

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Xue, Jianru, Nanning Zheng e Xiaopin Zhong. "Sequential Stratified Sampling Belief Propagation for Multiple Targets Tracking". In Lecture Notes in Computer Science, 330–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11538059_35.

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Bozzano, Marco, Alessandro Cimatti, Anthony Fernandes Pires, Alberto Griggio, Martin Jonáš e Greg Kimberly. "Efficient SMT-Based Analysis of Failure Propagation". In Computer Aided Verification, 209–30. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81688-9_10.

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AbstractThe process of developing civil aircraft and their related systems includes multiple phases of Preliminary Safety Assessment (PSA). An objective of PSA is to link the classification of failure conditions and effects (produced in the functional hazard analysis phases) to appropriate safety requirements for elements in the aircraft architecture. A complete and correct preliminary safety assessment phase avoids potentially costly revisions to the design late in the design process. Hence, automated ways to support PSA are an important challenge in modern aircraft design. A modern approach to conducting PSAs is via the use of abstract propagation models, that are basically hyper-graphs where arcs model the dependency among components, e.g. how the degradation of one component may lead to the degraded or failed operation of another. Such models are used for computing failure propagations: the fault of a component may have multiple ramifications within the system, causing the malfunction of several interconnected components. A central aspect of this problem is that of identifying the minimal fault combinations, also referred to as minimal cut sets, that cause overall failures.In this paper we propose an expressive framework to model failure propagation, catering for multiple levels of degradation as well as cyclic and nondeterministic dependencies. We define a formal sequential semantics, and present an efficient SMT-based method for the analysis of failure propagation, able to enumerate cut sets that are minimal with respect to the order between levels of degradation. In contrast with the state of the art, the proposed approach is provably more expressive, and dramatically outperforms other systems when a comparison is possible.
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Wang, Jingyan, Yongping Li, Ying Zhang e Jianhua He. "Semi-supervised Protein Function Prediction via Sequential Linear Neighborhood Propagation". In Bio-Inspired Computing and Applications, 435–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-24553-4_57.

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Diskin, Zinovy. "General Supervised Learning as Change Propagation with Delta Lenses". In Lecture Notes in Computer Science, 177–97. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45231-5_10.

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AbstractDelta lenses are an established mathematical framework for modelling and designing bidirectional model transformations (Bx). Following the recent observations by Fong et al, the paper extends the delta lens framework with a a new ingredient: learning over a parameterized space of model transformations seen as functors. We will define a notion of an asymmetric learning delta lens with amendment (ala-lens), and show how ala-lenses can be organized into a symmetric monoidal (sm) category. We also show that sequential and parallel composition of well-behaved (wb) ala-lenses are also wb so that wb ala-lenses constitute a full sm-subcategory of ala-lenses.
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Bozzano, Marco, Alessandro Cimatti, Alberto Griggio e Martin Jonáš. "Efficient Analysis of Cyclic Redundancy Architectures via Boolean Fault Propagation". In Tools and Algorithms for the Construction and Analysis of Systems, 273–91. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99527-0_15.

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AbstractMany safety critical systems guarantee fault-tolerance by using several redundant copies of their components. When designing such redundancy architectures, it is crucial to analyze their fault trees, which describe combinations of faults of individual components that may cause malfunction of the system. State-of-the-art techniques for fault tree computation use first-order formulas with uninterpreted functions to model the transformations of signals performed by the redundancy system and an AllSMT query for computation of the fault tree from this encoding. Scalability of the analysis can be further improved by techniques such as predicate abstraction, which reduces the problem to Boolean case.In this paper, we show that as far as fault trees of redundancy architectures are concerned, signal transformation can be equivalently viewed in a purely Boolean way as fault propagation. This alternative view has important practical consequences. First, it applies also to general redundancy architectures with cyclic dependencies among components, to which the current state-of-the-art methods based on AllSMT are not applicable, and which currently require expensive sequential reasoning. Second, it allows for a simpler encoding of the problem and usage of efficient algorithms for analysis of fault propagation, which can significantly improve the runtime of the analyses. A thorough experimental evaluation demonstrates the superiority of the proposed techniques.
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Singh, Sarbjeet. "A Review of Trust Management for Mobile Ad Hoc Networks". In Advances in Wireless Technologies and Telecommunication, 142–54. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2342-0.ch007.

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Establishing trust in Mobile Ad hoc Networks (MANETs) is a challenging task. Trust management consists of various activities like prediction of trust, computation of trust, propagation of trust, aggregation of trust etc. Trust prediction can be done based on past behavior of node, internal parameters of the node, or it can be induction-based or neural-network based. Trust computation can be centralized or distributed. Trust propagation can be social networks based, small world phenomenon based, web of trust based, distributed hash table based. Trust aggregation can be weighted average based, probability based, sequential, conditional-sequential, parallel or subjective logic based. This work presents the review of various activities pertaining to trust management to enable researchers, academicians and practitioners to identify and address trust related issues in a better way.
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Carlos Amaro de Faria, Antônio. "Optical Sensor for Nonlinear and Quantum Optical Effects". In Nonlinear Optics - From Solitons to Similaritons. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.90857.

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In this chapter, the main foundations for the conception, design, and the project of optical sensors that explore the effects of nonlinear and quantum optics are presented. These sensors have a variety of applications from the design of waveguides with self-selection of propagation modes to signal processing and quantum computing. The chapter seeks to present formal aspects of applied modern optics in a detailed, sequential, and concise manner.
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Nechval, N. A., e K. N. Nechval. "Efficient Planning". In Mathematical Concepts and Applications in Mechanical Engineering and Mechatronics, 328–49. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1639-2.ch016.

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The main aim of this chapter is to present more accurate stochastic fatigue models for solving the fatigue reliability problems, which are attractively simple and easy to apply in practice for situations where it is difficult to quantify the costs associated with inspections and undetected cracks. From an engineering standpoint the fatigue life of a structure consists of two periods: (i) crack initiation period, which starts with the first load cycle and ends when a technically detectable crack is presented, and (ii) crack propagation period, which starts with a technically detectable crack and ends when the remaining cross section can no longer withstand the loads applied and fails statically. Periodic inspections of aircraft, which are common practice in order to maintain their reliability above a desired minimum level, are based on the conditional reliability of the fatigued structure. During the period of crack initiation, when the parameters of the underlying lifetime distributions are not assumed to be known, for efficient in-service inspection planning (with decreasing intervals as alternative to constant intervals often used in practice for convenience in operation), the pivotal quantity averaging (PQA) approach is offered. During the period of crack propagation (when the damage tolerance situation is used), the approach, based on an innovative crack growth equation, to efficient in-service inspection planning (with decreasing intervals between sequential inspections) is proposed to construct more accurate reliability-based inspection strategy in this case. To illustrate the suggested approaches, numerical examples are given.

Atti di convegni sul tema "Sequential propagation":

1

Briers, M., A. Doucet e S. S. Singh. "Sequential auxiliary particle belief propagation". In 2005 7th International Conference on Information Fusion. IEEE, 2005. http://dx.doi.org/10.1109/icif.2005.1591923.

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Manteufel, Randall D. "Sequential Perturbation Uncertainty Propagation in Thermal-Fluid Applications". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88316.

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A challenge in an undergraduate mechanical engineering curriculum is having students demonstrate “an ability to design and conduct experiments, as well as analyze and interpret data” as required for ABET accreditation. It is expected that students be able to identify and quantify sources of uncertainty, propagate uncertainties to intermediate and final results, interpret the relative importance of uncertainty sources, and develop experimental strategies to reduce the uncertainties in the final results. A spreadsheet application is presented that helps students learn these concepts and “see” what drives the uncertainty in the final results. The method known as sequential perturbation is used and shown to greatly reduce the tediousness of the calculations. As presented, the method significantly reduces the complexity of uncertainty analysis by eliminating the need to differentiate relationships between primary measurements and inferred measurements. Differentiation of complex relationships is often tedious and error-prone. The method is applied to three thermal-fluid application problems. Feedback from students is presented and is positive. The method summarized here should help students learn about the propagation of uncertainties and help demonstrate meeting ABET outcome “b”. The method can be extended beyond laboratory classes and is shown to be useful in design of experiments.
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Lin Zheng e Quan Liu. "Articulated Body tracking based on sequential belief propagation". In 2010 2nd International Conference on Computer Engineering and Technology. IEEE, 2010. http://dx.doi.org/10.1109/iccet.2010.5486222.

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Kin-Fai Tong, Jie Du e Jingjing Huang. "Novel sequential rotation technique for broadband circularly polarized microstrip ring antennas". In Propagation Conference (LAPC). IEEE, 2008. http://dx.doi.org/10.1109/lapc.2008.4516932.

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Fastovets, Mykyta, Jean-Yves Guillemaut e Adrian Hilton. "Athlete pose estimation by non-sequential key-frame propagation". In CVMP '14: 11th European Conference on Visual Media Production. New York, NY, USA: ACM, 2014. http://dx.doi.org/10.1145/2668904.2668938.

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Yao, Junyi, Shuming Zhang, Baozhu Li, Huali Lu e Wanchun Tang. "Indoor Propagation Estimation Based on LOLA-Voronoi Sequential Design". In 2019 8th Asia-Pacific Conference on Antennas and Propagation (APCAP). IEEE, 2019. http://dx.doi.org/10.1109/apcap47827.2019.9472013.

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Pan, Pan, e Dan Schonfeld. "Sequential particle filtering for conditional density propagation on graphs". In 2009 16th IEEE International Conference on Image Processing ICIP 2009. IEEE, 2009. http://dx.doi.org/10.1109/icip.2009.5413454.

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Chang, Sheng, Fangxu Zhou, Xi Chen e Hua Han. "Electron microscopic sequential images stitching based on belief propagation". In Eleventh International Conference on Graphics and Image Processing, a cura di Zhigeng Pan e Xun Wang. SPIE, 2020. http://dx.doi.org/10.1117/12.2557179.

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Mondal, Arijit, P. P. Chakrabarti e Pallab Dasgupta. "Timing Analysis of Sequential Circuits Using Symbolic Event Propagation". In 2007 International Conference on Computing: Theory and Applications (ICCTA'07). IEEE, 2007. http://dx.doi.org/10.1109/iccta.2007.125.

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Tidd, W., Yufei Zhao e Yikun Huang. "Sequential beamspace DOA estimation". In 2011 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2011. http://dx.doi.org/10.1109/aps.2011.5997112.

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