Relevant bibliographies by topics / Models

Academic literature on the topic 'Models'

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Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Models"

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Wheeler, Gregory. "Models, Models, and Models." Metaphilosophy 44, no. 3 (April 2013): 293–300. http://dx.doi.org/10.1111/meta.12036.

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Mohammed, Mohammed Ameen, Zheng Han, and Yange Li. "Exploring the Detection Accuracy of Concrete Cracks Using Various CNN Models." Advances in Materials Science and Engineering 2021 (September 9, 2021): 1–11. http://dx.doi.org/10.1155/2021/9923704.

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Automatic crack detection with the least amount of workforce has become a crucial task in the inspection and evaluation of the performances of concrete structure in civil engineering. Recently, although many concrete crack detection models based on convolutional neural networks (CNNs) have been developed, the accuracy of the proposed models varies. Up-to-date, the issue regarding the convolutional neural network architecture with best performance for detecting concrete cracks is still debated in many previous studies. In this paper, we choose three established open-source CNN models (Model1, Model2, and Model3) which have been well-illustrated and verified in previous studies and test them for the purpose of crack detection of concrete structures. The chosen three models are trained using a concrete crack dataset containing 40,000 images those with 227 × 227-pixel in size. The performance of three different convolutional neural network (CNN) models was then evaluated. The comprehensive comparison result indicates that Model2 which used batch normalization is capable of the best performance amongst the three models as selected for concrete cracks detection, with recording the highest classification accuracy and low loss. In a conclusion, we recommend Model2 for a concrete crack detection task.
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Lei, Y., and S. Y Zhang. "Comparison and selection of growth models using the Schnute model." Journal of Forest Science 52, No. 4 (January 9, 2012): 188–96. http://dx.doi.org/10.17221/4501-jfs.

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Forestmodellers have long faced the problem of selecting an appropriate mathematical model to describe tree ontogenetic or size-shape empirical relationships for tree species. A common practice is to develop many models (or a model pool) that include different functional forms, and then to select the most appropriate one for a given data set. However, this process may impose subjective restrictions on the functional form. In this process, little attention is paid to the features (e.g. asymptote and inflection point rather than asymptote and nonasymptote) of different functional forms, and to the intrinsic curve of a given data set. In order to find a better way of comparing and selecting the growth models, this paper describes and analyses the characteristics of the Schnute model. This model has both flexibility and versatility that have not been used in forestry. In this study, the Schnute model was applied to different data sets of selected forest species to determine their functional forms. The results indicate that the model shows some desirable properties for the examined data sets, and allows for discerning the different intrinsic curve shapes such as sigmoid, concave and other curve shapes. Since no suitable functional form for a given data set is usually known prior to the comparison of candidate models, it is recommended that the Schnute model be used as the first step to determine an appropriate functional form of the data set under investigation in order to avoid using a functional form a priori.
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Perrin, C., V. Andréassian, and C. Michel. "Simple benchmark models as a basis for model efficiency criteria." River Systems 17, no. 1-2 (July 28, 2006): 221–44. http://dx.doi.org/10.1127/lr/17/2006/221.

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Corballis, Michael C. "Postscript: Models, models...." Psychological Review 108, no. 4 (2001): 809–10. http://dx.doi.org/10.1037/h0092889.

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Cwojdziński, Leszek, Jerzy Lewitowicz, and Andrzej Żyluk. "Models of Air Missions / Modele Misji Lotniczych." Journal of KONBiN 22, no. 1 (June 1, 2012): 35–44. http://dx.doi.org/10.2478/jok-2013-0020.

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Abstract Combat missions of both a single multi-role aircraft and a group of aircraft. Compatibility and readiness - properties determining accomplishment of an air operation. Scenarios of air operations. Models of air-to-air and air-to-surface operations (AAO and ASO, respectively). Computer modelling of air missions.
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Müller, Marcelo Dias, Thiago Taglialegna Salles, Domingos Sávio Campos Paciullo, Alexandre Magno Brighenti, and Carlos Renato Tavares de Castro. "EQUAÇÕES DE ALTURA, VOLUME E AFILAMENTO PARA EUCALIPTO E ACÁCIA ESTABELECIDOS EM SISTEMA SILVIPASTORIL." FLORESTA 44, no. 3 (March 21, 2014): 473. http://dx.doi.org/10.5380/rf.v44i3.33149.

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O objetivo deste trabalho foi selecionar modelos alométricos para estimativa de altura, volume e afilamento do tronco de duas espécies florestais estabelecidas em um sistema silvipastoril com 10 anos de idade. Para a variável volume, foram testados modelos de simples e dupla entrada e para o afilamento do tronco foram testados modelos segmentados e não segmentados. Para estimativa da altura das árvores de eucalipto, foi selecionado o modelo semilogarítmico e para a acácia o modelo de melhor desempenho foi o exponencial. Entre os modelos volumétricos, aqueles de dupla entrada apresentaram melhores ajustes, sendo que o modelo de Schumacher & Hall se destacou com estatísticas ligeiramente superiores aos demais. Para o afilamento de tronco, os modelos segmentados apresentaram melhor desempenho. Para árvores de eucalipto, o modelo de Max & Burkhart se mostrou mais adequado, e para acácia, o modelo de Parresol foi o que apresentou o melhor ajuste. De forma geral, os modelos se ajustaram melhor aos dados das árvores de eucalipto.Palavras-chave: Agrossilvicultura; modelagem; programa ABC. AbstractHeight, volume and taper equations for eucalipt and acacia mangium established in a silvopastoral system. The objective of this work was to select allometric models for height, volume and taper estimation of two forestry species established in a ten years old silvopastoral system. Single (breast height diameter as the independent variable) and double entry (breast height diameter and total height as independent variables) models were evaluated for the volume estimation. We evaluated segmented and non-segmented models for the taper equations. The semilogaritmic model and the exponential model fitted better for the estimation of eucalyptus and acacia trees height, respectively. In general, the double entry volumetric models presented the best adjustments and Schumacher & Hall`s model presented slightly higher statistics among the models. In the case of taper models, we observed that the segmented models fitted better to the data for both species. Max & Burkhar´s model and the Parresol´s model were selected for eucalyptus trees and acacia trees, respectively. In general, all tested models fitted better to eucalyptus trees.Keywords: Agroforestry; Modeling; Eucalyptus; Acacia.
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ten Cate, Jacob M. "Models and Role Models." Caries Research 49, Suppl. 1 (2015): 3–10. http://dx.doi.org/10.1159/000380870.

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Developing experimental models to understand dental caries has been the theme in our research group. Our first, the pH-cycling model, was developed to investigate the chemical reactions in enamel or dentine, which lead to dental caries. It aimed to leverage our understanding of the fluoride mode of action and was also utilized for the formulation of oral care products. In addition, we made use of intra-oral (in situ) models to study other features of the oral environment that drive the de/remineralization balance in individual patients. This model addressed basic questions, such as how enamel and dentine are affected by challenges in the oral cavity, as well as practical issues related to fluoride toothpaste efficacy. The observation that perhaps fluoride is not sufficiently potent to reduce dental caries in the present-day society triggered us to expand our knowledge in the bacterial aetiology of dental caries. For this we developed the Amsterdam Active Attachment biofilm model. Different from studies on planktonic (‘single') bacteria, this biofilm model captures bacteria in a habitat similar to dental plaque. With data from the combination of these models, it should be possible to study separate processes which together may lead to dental caries. Also products and novel agents could be evaluated that interfere with either of the processes. Having these separate models in place, a suggestion is made to design computer models to encompass the available information. Models but also role models are of the utmost importance in bringing and guiding research and researchers.
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Baden-Fuller, Charles, and Mary S. Morgan. "Business Models as Models." Long Range Planning 43, no. 2-3 (April 2010): 156–71. http://dx.doi.org/10.1016/j.lrp.2010.02.005.

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Salis, Fiora. "Models and exploratory models." Studies in History and Philosophy of Science Part A 63 (June 2017): 58–61. http://dx.doi.org/10.1016/j.shpsa.2017.04.004.

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Dissertations / Theses on the topic "Models"

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Andriushchenko, Roman. "Computer-Aided Synthesis of Probabilistic Models." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2020. http://www.nusl.cz/ntk/nusl-417269.

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Předkládaná práce se zabývá problémem automatizované syntézy pravděpodobnostních systémů: máme-li rodinu Markovských řetězců, jak lze efektivně identifikovat ten který odpovídá zadané specifikaci? Takové rodiny často vznikají v nejrůznějších oblastech inženýrství při modelování systémů s neurčitostí a rozhodování i těch nejjednodušších syntézních otázek představuje NP-těžký problém. V dané práci my zkoumáme existující techniky založené na protipříklady řízené induktivní syntéze (counterexample-guided inductive synthesis, CEGIS) a na zjemňování abstrakce (counterexample-guided abstraction refinement, CEGAR) a navrhujeme novou integrovanou metodu pro pravděpodobnostní syntézu. Experimenty nad relevantními modely demonstrují, že navržená technika je nejenom srovnatelná s moderními metodami, ale ve většině případů dokáže výrazně překonat, někdy i o několik řádů, existující přístupy.
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Rozestraten, Artur Simões. "Estudo sobre a história dos modelos arquitetônicos na antigüidade: origens e características das primeiras maquetes de arquiteto." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/16/16131/tde-09062009-145825/.

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Este estudo se propõe a identificar dentre os diversos exemplos de modelos arquitetônicos da Antigüidade atualmente conhecidos pela arqueologia e descritos na literatura aqueles que podem ser caracterizados como as primeiras maquetes de arquiteto, isto é, objetos diretamente relacionados ao conhecimento, planejamento e comunicação de conteúdos arquitetônicos. O recuo à Antigüidade se faz necessário na medida em que essa dissertação se propõe a estudar as origens da relação entre modelos tridimensionais e a atividade de arquitetos na cultura ocidental. Em termos cronológicos, este estudo inicia-se cerca de 6.000 anos antes de Cristo e encerra-se no Mundo Romano (séc. V d.C.). Em termos geográficos, este estudo aborda objetos produzidos por culturas do sudeste da Europa neolítica, conjuntos de objetos de culturas do Oriente-Próximo, objetos egípcios, egeanos (cretenses e cicládicos), cipriotas, gregos, villanovianos e romanos. Essa pesquisa conclui que as evidências materiais da existência de maquetes de arquiteto na Antigüidade Clássica são raras e pouco precisas. Alguns objetos no entanto se aproximam dessa caracterização e merecem estudos futuros mais aprofundados, são eles: o conjunto de tijolos miniatura de Tepe Gawra (c. 3500 a.C.); o modelo egípcio de Dashour (1990-1730 a.C.); o modelo minóico de Arkhanes (1.700-1.630 a.C.); os modelos romanos de Óstia (séc. I a.C.), o modelo de templo de Niha (séc. II d.C.), o modelo de teatro de Baalbek (séc. II d.C.), e o modelo de stadium de Villa Adriana (séc. II d.C.).
This study intends to identify the first architects models among the several architectural models already known and presented in literature. Architects models are third-dimensional objects directly related to knowledge, planning and communication of architectural matters. Recession to Antiquity seems necessary in order to study the origins of the relation between three-dimensional model and architects work in the western world. Chronologically this study begins at 6.000 b.C. and ends at the Roman world (c. 200 a.D.). In geographical terms this study focuses objects produced by Neolithic Southeastern European cultures, Near Eastern cultures, Egyptian culture, Aegean cultures (Cretan and Cycladic), Cypriot, Greek, Villanovian and Roman cultures. Material evidences for architects models are rare and inaccurate all over Antiquity. Nevertheless some few objects are very close to architects work deserving deeper future studies: the miniature brick ensemble from Tepe Gawra (c. 3.500 a.C.); the Egyptian Dahshours model (1.990-1.730 a.C.); the minoan model of Arkhanes (1.700-1.630 a.C.) and the Roman models of Ostia (I a.C.), Niha, Baalbek and Villa Adriana (II d.C.).
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Kang, Changsung. "Model testing for causal models." [Ames, Iowa : Iowa State University], 2008.

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LIMA, FILHO Luiz Medeiros de Araújo. "Modelos simétricos transformados não-lineares com diferentes distribuições dos erros: aplicações em ciências florestais." Universidade Federal Rural de Pernambuco, 2009. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5175.

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Submitted by (ana.araujo@ufrpe.br) on 2016-08-03T15:09:46Z No. of bitstreams: 1 Luiz Medeiros de Araujo Lima Filho.pdf: 529199 bytes, checksum: 06cae9ad9a02975b786cf55a000dbc5b (MD5)
Made available in DSpace on 2016-08-03T15:09:46Z (GMT). No. of bitstreams: 1 Luiz Medeiros de Araujo Lima Filho.pdf: 529199 bytes, checksum: 06cae9ad9a02975b786cf55a000dbc5b (MD5) Previous issue date: 2009-02-13
Historically, the wood of the eucalyptus is used for the most varied applications, such as; firewood, charcoal, cellulose, railway sleepers, posts for electrification, bark to tan leather, essential oils, civil construction, etc. The Gypsum Pole of Araripe in Pernambuco is a great firewood consumer for the gypsum production. Due to great need to find economical and environmental alternatives for the area, the sustainable production of eucalyptus that is a fast growth tree with great versatility has an important role. In the planning of the sustainable forest management there is a variable of extreme importance: the growth. To model the growth is fundamental in the prognosis of the productivity, site quality and dynamics of populations. Usually, the growth curves are fitted through nonlinear models developed empirically to relate, for instance, height and age. The Chapman-Richards model is a nonlinear model frequently used to model forest growth. In studies of this type, in general, it is assumed that the errors follow approximately the normal distribution. However, to model the growth assuming that the errors have a normal distribution is quite sensitive to atypical values that can happen, and generate bad estimates of the parameters. To correct that problem a new class of transformed symmetrical models was developed considering for the errors symmetrical continuous distributions with heavier tails than the normal distribution and allowing a possible nonlinear structure for the mean. With the expectation of obtaining better estimates of eucalyptus growth, it was applied to the Chapman-Richards model the following distributions of the errors: normal, t of Student, Cauchy, exponential potency, logistics I and logistics II. The t distribution of Student with 2 degrees of freedom was the most efficient to estimate height and circumference growth of eucalyptus in the Gypsum Pole of Pernambuco.
Historicamente, a madeira do Eucalyptus é usada para os mais variados fins, tais como; lenha, carvão vegetal, celulose, dormentes ferroviários, postes para eletrificação, casca para curtir couro, óleos essenciais, construção civil, etc. O Pólo Gesseiro do Araripe em Pernambuco é um grande consumidor de madeira para produção de gesso. Devido à grande necessidade de se buscar uma alternativa econômica e ambiental para a região é de interesse obter uma produção sustentável para o Eucalyptus, uma vez que esta é uma árvore de rápido crescimento e grande versatilidade. No planejamento do manejo florestal sustentado uma variável é de extrema importância: o crescimento. Sua modelagem é fundamental na prognose da produtividade, qualidade do local e dinâmica de populações. Geralmente, as curvas de crescimento são estudadas por meio de modelos não-lineares desenvolvidos empiricamente para relacionar, por exemplo, altura e idade. Um modelo não-linear bastante utilizado na prática para modelar curvas de crescimento é o modelo de Chapman-Richards. Em estudos deste tipo, em geral, assume-se que os erros seguem distribuição normal. Contudo, a modelagem sob a suposição de erros com distribuição normal é bastante sensível a valores atípicos que por ventura possam ocorrer, podendo distorcer as estimativas dos parâmetros. Para corrigir esse problema Cordeiro et al. (2009) desenvolveram uma nova classe de modelos simétricos transformados considerando para os erros distribuições contínuas simétricas com caudas mais pesadas do que a distribuição normal e permitindo uma possível estrutura não-linear para a média. Dessa forma, com a expectativa de obter melhores estimativas de crescimento de Eucalyptus, aplicaram-se ao modelo de Chapman-Richards as seguintes distribuições dos erros: normal, t de Student, Cauchy, exponencial potência, logística I e logística II que apresentou a distribuição t de Student com 2 graus de liberdade com melhores estimativas de crescimento em altura e circunferência de Eucalyptus no Pólo Gesseiro de Pernambuco.
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Kotsalis, Georgios. "Model reduction for Hidden Markov models." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/38255.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.
Includes bibliographical references (leaves 57-60).
The contribution of this thesis is the development of tractable computational methods for reducing the complexity of two classes of dynamical systems, finite alphabet Hidden Markov Models and Jump Linear Systems with finite parameter space. The reduction algorithms employ convex optimization and numerical linear algebra tools and do not pose any structural requirements on the systems at hand. In the Jump Linear Systems case, a distance metric based on randomization of the parametric input is introduced. The main point of the reduction algorithm lies in the formulation of two dissipation inequalities, which in conjunction with a suitably defined storage function enable the derivation of low complexity models, whose fidelity is controlled by a guaranteed upper bound on the stochastic L2 gain of the approximation error. The developed reduction procedure can be interpreted as an extension of the balanced truncation method to the broader class of Jump Linear Systems. In the Hidden Markov Model case, Hidden Markov Models are identified with appropriate Jump Linear Systems that satisfy certain constraints on the coefficients of the linear transformation. This correspondence enables the development of a two step reduction procedure.
(cont.) In the first step, the image of the high dimensional Hidden Markov Model in the space of Jump Linear Systems is simplified by means of the aforementioned balanced truncation method. Subsequently, in the second step, the constraints that reflect the Hidden Markov Model structure are imposed by solving a low dimensional non convex optimization problem. Numerical simulation results provide evidence that the proposed algorithm computes accurate reduced order Hidden Markov Models, while achieving a compression of the state space by orders of magnitude.
by Georgios Kotsalis.
Ph.D.
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Pommellet, Adrien. "On model-checking pushdown systems models." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC207/document.

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Cette thèse introduit différentes méthodes de vérification (ou model-checking) sur des modèles de systèmes à pile. En effet, les systèmes à pile (pushdown systems) modélisent naturellement les programmes séquentiels grâce à une pile infinie qui peut simuler la pile d'appel du logiciel. La première partie de cette thèse se concentre sur la vérification sur des systèmes à pile de la logique HyperLTL, qui enrichit la logique temporelle LTL de quantificateurs universels et existentiels sur des variables de chemin. Il a été prouvé que le problème de la vérification de la logique HyperLTL sur des systèmes d'états finis est décidable ; nous montrons que ce problème est en revanche indécidable pour les systèmes à pile ainsi que pour la sous-classe des systèmes à pile visibles (visibly pushdown systems). Nous introduisons donc des algorithmes d'approximation de ce problème, que nous appliquons ensuite à la vérification de politiques de sécurité. Dans la seconde partie de cette thèse, dans la mesure où la représentation de la pile d'appel par les systèmes à pile est approximative, nous introduisons les systèmes à surpile (pushdown systems with an upper stack) ; dans ce modèle, les symboles retirés de la pile d'appel persistent dans la zone mémoire au dessus du pointeur de pile, et peuvent être plus tard écrasés par des appels sur la pile. Nous montrons que les ensembles de successeurs post* et de prédécesseurs pre* d'un ensemble régulier de configurations ne sont pas réguliers pour ce modèle, mais que post* est toutefois contextuel (context-sensitive), et que l'on peut ainsi décider de l'accessibilité d'une configuration. Nous introduisons donc des algorithmes de sur-approximation de post* et de sous-approximation de pre*, que nous appliquons à la détection de débordements de pile et de manipulations nuisibles du pointeur de pile. Enfin, dans le but d'analyser des programmes avec plusieurs fils d'exécution, nous introduisons le modèle des réseaux à piles dynamiques synchronisés (synchronized dynamic pushdown networks), que l'on peut voir comme un réseau de systèmes à pile capables d'effectuer des changements d'états synchronisés, de créer de nouveaux systèmes à piles, et d'effectuer des actions internes sur leur pile. Le problème de l'accessibilité étant naturellement indécidable pour un tel modèle, nous calculons une abstraction des chemins d'exécutions entre deux ensembles réguliers de configurations. Nous appliquons ensuite cette méthode à un processus itératif de raffinement des abstractions
In this thesis, we propose different model-checking techniques for pushdown system models. Pushdown systems (PDSs) are indeed known to be a natural model for sequential programs, as they feature an unbounded stack that can simulate the assembly stack of an actual program. Our first contribution consists in model-checking the logic HyperLTL that adds existential and universal quantifiers on path variables to LTL against pushdown systems (PDSs). The model-checking problem of HyperLTL has been shown to be decidable for finite state systems. We prove that this result does not hold for pushdown systems nor for the subclass of visibly pushdown systems. Therefore, we introduce approximation algorithms for the model-checking problem, and show how these can be used to check security policies. In the second part of this thesis, as pushdown systems can fail to accurately represent the way an assembly stack actually operates, we introduce pushdown systems with an upper stack (UPDSs), a model where symbols popped from the stack are not destroyed but instead remain just above its top, and may be overwritten by later push rules. We prove that the sets of successors post* and predecessors pre* of a regular set of configurations of such a system are not always regular, but that post* is context-sensitive, hence, we can decide whether a single configuration is forward reachable or not. We then present methods to overapproximate post* and under-approximate pre*. Finally, we show how these approximations can be used to detect stack overflows and stack pointer manipulations with malicious intent. Finally, in order to analyse multi-threaded programs, we introduce in this thesis a model called synchronized dynamic pushdown networks (SDPNs) that can be seen as a network of pushdown processes executing synchronized transitions, spawning new pushdown processes, and performing internal pushdown actions. The reachability problem for this model is obviously undecidable. Therefore, we compute an abstraction of the execution paths between two regular sets of configurations. We then apply this abstraction framework to a iterative abstraction refinement scheme
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Peak, Russell Speights. "Product model-based analytical models (PBAMs) : a new representation of engineering analysis models." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/18379.

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Mateluna, Diego Ignacio Gallardo. "Extensões em modelos de sobrevivência com fração de cura e efeitos aleatórios." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/45/45133/tde-24062014-202301/.

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Neste trabalho são apresentadas algumas extensões de modelos de sobrevivência com fração de cura, assumindo o contexto em que as observações estão agrupadas. Dois efeitos aleatórios são incorporados para cada grupo: um para explicar o efeito no tempo de sobrevida das observações suscetíveis e outro para explicar a probabilidade de cura. Apresenta-se uma abordagem clássica através dos estimadores REML e uma abordagem bayesiana através do uso de processos de Dirichlet. Discute-se alguns estudos de simulação em que avalia-se o desempenho dos estimadores propostos, além de comparar as duas abordagens. Finalmente, ilustram-se os resultados com dados reais.
In this work some extensions in survival models with cure fraction are presented, assuming the context in which the observations are grouped into clusters. Two random effects are incorporated for each group: one to explain the effect on survival time of susceptible observations and another to explain the probability of cure. A classical approach through the REML estimators is presented as well as a bayesian approach through Dirichlet Process. Besides comparing both approaches, some simulation studies which evaluates the performance of the proposed estimators are discussed. Finally, the results are illustrated with a real database.
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Fernandes, Walney Reis. "Modelos de emparelhamento integráveis." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-21102010-121332/.

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O objetivo deste trabalho foi o estudo do Ansatz de Bethe Algébrico (ABA), que é uma técnica utilizada na obtenção dos auto-estados do hamiltoniano de inúmeros modelos da Mecânica Estatística e da Teoria Quântica de Campos. Aplicamos este procedimento na diagonalização de três modelos de spins: o modelo de Heisenberg, o modelo de Heisenberg-Sklyanin e o modelo de Heisenberg-Cherednik. Na diagonalização do primeiro modelo, não foi possível encontrar todos os auto-estados do hamiltoniano através do ABA e, durante o procedimento de obtenção das expressões analíticas, nos deparamos com um conjunto de identidades inédito na literatura. A matriz de borda do modelo de Heisenberg-Sklyanin acopla o último e o primeiro sítios, generalizando o modelo anterior, e permite estabelecer uma relação limite com outros modelos integráveis. Neste caso também não conseguimos obter todos os auto-estados utilizando a técnica do ABA. Diferentemente do que ocorreu para os primeiros modelos, o de Heisenberg-Cherednik, com acoplamentos que alternam a intensidade ao longo da cadeia de spin, apresentou um conjunto completo de auto-estados quando diagonalizado pelo ABA.
The goal of this work was to study the Algebraic Bethe ansatz (ABA), which is a technique used to obtain the eigenstates of Hamiltonian of many models of Statistical Mechanics and Quantum Field Theory. We apply this procedure to diagonalize three types of spin models: the Heisenberg model, the Heisenberg-Sklyanin model and the Heisenberg-Cherednik model. On diagonalization of the …rst model, we could not …nd all the eigenstates of Hamiltonian through ABA, and during the procedure for obtaining the analytical expressions, we face an unprecedented set of identities in literature. The Sklyanin´s boundary matrix couples the fi…rst and last sites, generalizing the previous model, and provides a limit for other integrable models. In this case also did not get all eigenstates using the technique of ABA. Unlike what happened with the …rst models, the Heisenberg-Cherednik model, with alternating couplings the intensity along the spin chain, presented a complete set of eigenstates when diagonalized by ABA.
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Ribeiro, Darielder Jesus. "Modelos de contato com probabilidades aperiódicas." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20052014-190949/.

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A análise de modelos de contato na presença de elementos de desordem fixa indica o surgimento de desvios em relação ao comportamento crítico do modelo uniforme subjacente. Nesse trabalho consideramos o efeito da aperiodicidade, que também é capaz de produzir flutuações de natureza geométrica. Utilizamos distri­ buições aperiódicas de probabilidades, definidas através de regras de substituição determinísticas, a fim de analisar o comportamento crítico desses modelos de con­ tato. Realizamos simulações de Monte Carlo para modelos definidos por três regras distintas, caracterizadas por um expoente w, associado à intensidade das flutuações geométricas. Nos modelos A e B, com w = -1 e w = 0, não constatamos qualquer mudança em relação à classe de universalidade crítica da percolação direcionada. Já no Modelo C, com w = 0.6309, as flutuações geométricas alteram a classe de universalidade crítica.
The analysis of contact models in the presence of quenched disorder indicates the onset of deviations with respect to the critical behavior of the underlying uniform system. In the present work, we consider the effects of aperiodicity, which are also known to produce fluctuation of geometric nature. We use aperiodic distributions of probabilities, given by deterministic substitution rules, in order to analyze the critical behavior. We performed Monte Carlo simulations for three different rules, characterized by an exponent w, which gauges the intensity of the geometric fluc­ tuations. For models A and B, with w = -1and w = 0, we have not detected any changes with respect to the universality class of directed percolation. For model C, with w = 0.6309, the geometric fluctuations change the critical universality class.
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Books on the topic "Models"

1

McMasters, Alan W. Wholesale provisioning models: Model evaluation. Monterey, California: Naval Postgraduate School, 1986.

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1935-, Gerkan Meinhard von, and Von Gerkan, Marg und Partner., eds. Idea and model =: Idee und Modell : 30 years of architectural models. Berlin: Ernst & Sohn, 1994.

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Hansen, Peter Reinhard. Model confidence sets for forecasting models. [Atlanta, Ga.]: Federal Reserve Bank of Atlanta, 2005.

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Moser, Barry Kurt. Linear models: A mean model approach. San Diego: Academic Press, 1996.

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Borowiak, Dale S. Model discrimination for nonlinear regression models. New York: M. Dekker, 1989.

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Dervin, Daniel. Enactments: American modes and psychohistorical models. Madison: Fairleigh Dickinson University Press, 1996.

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Kirby, Anthony J. From enzyme models to model enzymes. Cambridge: Royal Society of Chemistry, 2009.

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1949-, Thomson Ruth, ed. Models. New York: Crabtree Pub., 1998.

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Bulloch, Ivan. Models. London: Two-Can, 1994.

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Bliss, Helen. Models. New York: Crabtree Pub., 1998.

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Book chapters on the topic "Models"

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Pardo, Scott. "Models, Models Everywhere…Model Selection." In Statistical Analysis of Empirical Data, 121–60. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43328-4_11.

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Scheaffer, Richard L., Ann Watkins, Mrudulla Gnanadesikan, and Jeffrey A. Witmer. "Models, Models, Models…" In Activity-Based Statistics, 195–201. New York, NY: Springer New York, 1996. http://dx.doi.org/10.1007/978-1-4757-3843-8_42.

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Mellor, Stephen J. "Models. Models. Models. So What?" In Model Driven Engineering Languages and Systems, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04425-0_1.

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Thomas, Kenneth P. "Models, Models and More Models." In Investment Incentives and the Global Competition for Capital, 18–38. London: Palgrave Macmillan UK, 2011. http://dx.doi.org/10.1057/9780230302396_2.

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Briffaut, Jean-Pierre. "Business Models: Control Models, Flow Models, Organization Models, Function Models." In E-Enabled Operations Management, 33–56. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119145219.ch3.

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Djurfeldt, Göran, and Ola Hall. "Epidemiological Models." In Models for Non-Modelers, 24–37. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003328261-2.

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Bézivin, Jean, Fabian Büttner, Martin Gogolla, Frederic Jouault, Ivan Kurtev, and Arne Lindow. "Model Transformations? Transformation Models!" In Model Driven Engineering Languages and Systems, 440–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11880240_31.

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Scravaglieri, Pierangelo Marco. "The model of models." In Liquid Architecture, 25–32. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003349808-3.

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Fischer, Joachim, Birger Møller-Pedersen, Andreas Prinz, and Bernhard Thalheim. "Models Versus Model Descriptions." In Modelling to Program, 67–89. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72696-6_3.

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Halfar, Peter. "Models and Model Selection." In Stresses in glaciers, 71–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-66024-9_9.

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Conference papers on the topic "Models"

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"MODELS 2015 organization." In 2015 ACM/IEEE 18th International Conference on Model Driven Engineering Languages and Systems (MODELS). IEEE, 2015. http://dx.doi.org/10.1109/models.2015.7338225.

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Hartmann, Thomas, Assaad Moawad, Francois Fouquet, Gregory Nain, Jacques Klein, and Yves Le Traon. "Stream my models: Reactive peer-to-peer distributed models@run.time." In 2015 ACM/IEEE 18th International Conference on Model Driven Engineering Languages and Systems (MODELS). IEEE, 2015. http://dx.doi.org/10.1109/models.2015.7338238.

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Arulmohan, Sathurshan, Marie-Jean Meurs, and Sébastien Mosser. "Extracting Domain Models from Textual Requirements in the Era of Large Language Models." In 2023 ACM/IEEE International Conference on Model Driven Engineering Languages and Systems Companion (MODELS-C). IEEE, 2023. http://dx.doi.org/10.1109/models-c59198.2023.00096.

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"Steering Committee MODELS-C 2023." In 2023 ACM/IEEE International Conference on Model Driven Engineering Languages and Systems Companion (MODELS-C). IEEE, 2023. http://dx.doi.org/10.1109/models-c59198.2023.00006.

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"Conference Organization MODELS-C 2023." In 2023 ACM/IEEE International Conference on Model Driven Engineering Languages and Systems Companion (MODELS-C). IEEE, 2023. http://dx.doi.org/10.1109/models-c59198.2023.00005.

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Zoor, Maysam, Ludovic Apvrille, and Renaud Pacalet. "SysML models." In MODELS '20: ACM/IEEE 23rd International Conference on Model Driven Engineering Languages and Systems. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3417990.3419225.

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Montaghami, Vajih, and Derek Rayside. "Pattern-based debugging of declarative models." In 2015 ACM/IEEE 18th International Conference on Model Driven Engineering Languages and Systems (MODELS). IEEE, 2015. http://dx.doi.org/10.1109/models.2015.7338263.

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Kusel, Angelika, Jurgen Etzlstorfer, Elisabeth Kapsammer, Werner Retschitzegger, Wieland Schwinger, and Johannes Schonbock. "Consistent co-evolution of models and transformations." In 2015 ACM/IEEE 18th International Conference on Model Driven Engineering Languages and Systems (MODELS). IEEE, 2015. http://dx.doi.org/10.1109/models.2015.7338242.

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Przigoda, Nils, Christoph Hilken, Robert Wille, Jan Peleska, and Rolf Drechsler. "Checking concurrent behavior in UML/OCL models." In 2015 ACM/IEEE 18th International Conference on Model Driven Engineering Languages and Systems (MODELS). IEEE, 2015. http://dx.doi.org/10.1109/models.2015.7338248.

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Jahanbin, Sorour, Dimitris Kolovos, and Simos Gerasimou. "Towards Memory-Efficient Validation of Large XMI Models." In 2023 ACM/IEEE International Conference on Model Driven Engineering Languages and Systems Companion (MODELS-C). IEEE, 2023. http://dx.doi.org/10.1109/models-c59198.2023.00053.

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Reports on the topic "Models"

1

Tyler, Joan E. Models, managing models, quality models:. Gaithersburg, MD: National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.4738.

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Feng, Thomas H., and Edward A. Lee. Scalable Models Using Model Transformation. Fort Belvoir, VA: Defense Technical Information Center, July 2008. http://dx.doi.org/10.21236/ada518855.

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Dixon, Peter, Michael Jerie, and Maureen Rimmer. Modern Trade Theory for CGE Modelling: the Armington, Krugman and Melitz Models. GTAP Technical Paper, February 2015. http://dx.doi.org/10.21642/gtap.tp36.

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This paper is for CGE modelers and others interested in modern trade theory. The Armington specification of trade, assuming country-level product differentiation, has been central to CGE modelling for 40 years. Starting in the 1980s with Krugman and more recently Melitz, trade theorists have preferred specifications with firm-level product differentiation. We draw out the connections between the Armington, Krugman and Melitz models, deriving them as successively less restrictive special cases of an encompassing model. We then investigate optimality properties of the Melitz model, demonstrating that a Melitz general equilibrium is the solution to a global, cost-minimizing problem. This suggests that envelope theorems can be used in interpreting results from a Melitz model. Next we explain the Balistreri-Rutherford decomposition in which a Melitz general equilibrium model is broken into Melitz sectoral models combined with an Armington general equilibrium model. Balistreri and Rutherford see their decomposition as a basis of an iterative approach for solving Melitz general equilibrium models. We see it as a means for interpreting Melitz results as the outcome of an Armington simulation with additional shocks to productivity and preferences variables. With CGE modelers in mind, we report computational experience in solving a Melitz general equilibrium model using GEMPACK. Key words: Armington, Krugman and Melitz; CGE modelling; international trade. JEL codes: F12; D40; D58; C6
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Geoffrion, Andrew M. Reusing Structured Models via Model Integration. Fort Belvoir, VA: Defense Technical Information Center, September 1988. http://dx.doi.org/10.21236/ada204652.

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Zhang, Yongping, Wen Cheng, and Xudong Jia. Enhancement of Multimodal Traffic Safety in High-Quality Transit Areas. Mineta Transportation Institute, February 2021. http://dx.doi.org/10.31979/mti.2021.1920.

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Numerous extant studies are dedicated to enhancing the safety of active transportation modes, but very few studies are devoted to safety analysis surrounding transit stations, which serve as an important modal interface for pedestrians and bicyclists. This study bridges the gap by developing joint models based on the multivariate conditionally autoregressive (MCAR) priors with a distance-oriented neighboring weight matrix. For this purpose, transit-station-centered data in Los Angeles County were used for model development. Feature selection relying on both random forest and correlation analyses was employed, which leads to different covariate inputs to each of the two jointed models, resulting in increased model flexibility. Utilizing an Integrated Nested Laplace Approximation (INLA) algorithm and various evaluation criteria, the results demonstrate that models with a correlation effect between pedestrians and bicyclists perform much better than the models without such an effect. The joint models also aid in identifying significant covariates contributing to the safety of each of the two active transportation modes. The research results can furnish transportation professionals with additional insights to create safer access to transit and thus promote active transportation.
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Yang, Bwolen, Reid Simmons, Randal E. Bryant, and David R. O'Hallaron. Optimizing Symbolic Model Checking for Constraint-Rich Models. Fort Belvoir, VA: Defense Technical Information Center, March 1999. http://dx.doi.org/10.21236/ada363778.

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Mueller, Shane, Andrew Boettcher, and Michael Young. Delineating Cultural Models: Extending the Cultural Mixture Model. Fort Belvoir, VA: Defense Technical Information Center, December 2011. http://dx.doi.org/10.21236/ada572740.

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Nichols, William, and M. Oostrom. Model Package Report: Central Plateau Vadose Zone Models. Office of Scientific and Technical Information (OSTI), November 2020. http://dx.doi.org/10.2172/1714362.

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West, Kenneth. Inventory Models. Cambridge, MA: National Bureau of Economic Research, September 1993. http://dx.doi.org/10.3386/t0143.

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Rector, D. R., and B. C. Bunker. Sedimentation models. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/108208.

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