Bibliografie tematiche / SEMK model

Letteratura scientifica selezionata sul tema "SEMK model"

Autore: Grafiati

Pubblicato: 22 giugno 2024

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Articoli di riviste sul tema "SEMK model":

Bhattacharjee, S., e S. K. Ghosh. "SPATIO-TEMPORAL CHANGE MODELING OF LULC: A SEMANTIC KRIGING APPROACH". ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-4/W2 (14 luglio 2015): 177–84. http://dx.doi.org/10.5194/isprsannals-ii-4-w2-177-2015.

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Spatio-temporal land-use/ land-cover (LULC) change modeling is important to forecast the future LULC distribution, which may facilitate natural resource management, urban planning, etc. The spatio-temporal change in LULC trend often exhibits non-linear behavior, due to various dynamic factors, such as, human intervention (e.g., urbanization), environmental factors, etc. Hence, proper forecasting of LULC distribution should involve the study and trend modeling of historical data. Existing literatures have reported that the meteorological attributes (e.g., NDVI, LST, MSI), are semantically related to the terrain. Being influenced by the terrestrial dynamics, the temporal changes of these attributes depend on the LULC properties. Hence, incorporating meteorological knowledge into the temporal prediction process may help in developing an accurate forecasting model. This work attempts to study the change in inter-annual LULC pattern and the distribution of different meteorological attributes of a region in Kolkata (a metropolitan city in India) during the years 2000-2010 and forecast the future spread of LULC using semantic kriging (SemK) approach. A new variant of time-series SemK is proposed, namely Rev-SemKts to capture the multivariate semantic associations between different attributes. From empirical analysis, it may be observed that the augmentation of semantic knowledge in spatio-temporal modeling of meteorological attributes facilitate more precise forecasting of LULC pattern.

Justino, Priscilla F. C., Luis F. M. Melo, Andre F. Nogueira, Jose V. G. Costa, Luara M. N. Silva, Cecila M. Santos, Walber O. Mendes et al. "Treatment withSaccharomyces boulardiireduces the inflammation and dysfunction of the gastrointestinal tract in 5-fluorouracil-induced intestinal mucositis in mice". British Journal of Nutrition 111, n. 9 (6 febbraio 2014): 1611–21. http://dx.doi.org/10.1017/s0007114513004248.

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Intestinal mucositis is an important toxic side effect of 5-fluorouracil (5-FU) treatment.Saccharomyces boulardiiis known to protect from intestinal injury via an effect on the gastrointestinal microbiota. The objective of the present study was to evaluate the effect ofS. boulardiion intestinal mucositis induced by 5-FU in a murine model. Mice were divided into saline, saline (control)+5-FU or 5-FU+S. boulardii(16 × 109colony-forming units/kg) treatment groups, and the jejunum and ileum were removed after killing of mice for the evaluation of histopathology, myeloperoxidase (MPO) activity, and non-protein sulfhydryl group (mainly reduced glutathione; GSH), nitrite and cytokine concentrations. To determine gastric emptying, phenol red was administered orally, mice were killed 20 min after administration, and the absorbance of samples collected from the mice was measured by spectrophotometry. Intestinal permeability was measured by the urinary excretion rate of lactulose and mannitol following oral administration.S. boulardiisignificantly reversed the histopathological changes in intestinal mucositis induced by 5-FU and reduced the inflammatory parameters: neutrophil infiltration (control 1·73 (sem0·37) ultrastructural MPO (UMPO)/mg, 5-FU 7·37 (sem1·77) UMPO/mg and 5-FU+S. boulardii4·15 (sem0·73) UMPO/mg); nitrite concentration (control 37·00 (sem2·39) μm, 5-FU 59·04 (sem11·41) μmand 5-FU+S. boulardii37·90 (sem5·78) μm); GSH concentration (control 477·60 (sem25·25) μg/mg, 5-FU 270·90 (sem38·50) μg/mg and 5-FU+S. boulardii514·00 (sem38·64) μg/mg). Treatment with S.Boulardiisignificantly reduced the concentrations of TNF-α and IL-1β by 48·92 and 32·21 % in the jejunum and 38·92 and 61·79 % in the ileum. In addition,S. boulardiidecreased the concentrations of chemokine (C–X–C motif) ligand 1 by 5-fold in the jejunum and 3-fold in the ileum. Interestingly,S. boulardiireduced the delay in gastric emptying (control 25·21 (sem2·55) %, 5-FU 54·91 (sem3·43) % and 5-FU+S. boulardii31·38 (sem2·80) %) and induced the recovery of intestinal permeability (lactulose:mannitol ratio: control 0·52 (sem0·03), 5-FU 1·38 (sem0·24) and 5-FU+S. boulardii0·62 (sem0·03)). In conclusion,S. boulardiireduces the inflammation and dysfunction of the gastrointestinal tract in intestinal mucositis induced by 5-FU.

Fanqi Meng, Fanqi Meng, Wenying Cheng Fanqi Meng e Jingdong Wang Wenying Cheng. "An Integrated Semi-supervised Software Defect Prediction Model". 網際網路技術學刊 24, n. 6 (novembre 2023): 1307–17. http://dx.doi.org/10.53106/160792642023112406013.

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A novel semi-supervised software defect prediction model FFeSSTri (Filtered Feature Selecting, Sample and Tri-training) is proposed to address the problem that class imbalance and too many irrelevant or redundant features in labelled samples lower the accuracy of semi-supervised software defect prediction. Its innovation lies in that the construction of FFeSSTri integrates an oversampling technique, a new feature selection method, and a Tri-training algorithm, thus it can effectively improve the accuracy. Firstly, the oversampling technique is applied to expand the class of inadequate samples, thus it solves the unbalanced classification of the labelled samples. Secondly, a new filtered feature selection method based on relevance and redundancy is proposed, which can exclude those irrelevant or redundant features from labelled samples. Finally, the Tri-training algorithm is used to learn the labelled training samples to build the defect prediction model FFeSSTri. The experiments conducted on the NASA software defect prediction dataset show that FFeSSTri outperforms the existing four supervised learning methods and one semi-supervised learning method in terms of F-Measure values and AUC values.

Datz, Craig A., Robert C. Backus e Kevin L. Fritsche. "Dietary diacylglycerol oil has no effect on hypertriacylglycerolaemia in lipoprotein lipase-deficient cats". British Journal of Nutrition 102, n. 7 (28 aprile 2009): 1024–29. http://dx.doi.org/10.1017/s0007114509353234.

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A commercially available vegetable oil containing a high concentration (87 %, w/w) of diacylglycerol (DAG) has been investigated in humans and animals for potential beneficial effects in reducing serum TAG concentrations in fasting and postprandial states. Effects of DAG oil as a sole dietary fat source (25 % metabolisable energy) were evaluated in a feline model of hypertriacylglycerolaemia. Eleven adult (1·5 (sem0·1) years) male cats deficient of lipoprotein lipase (LPL) catalytic activity from a heritable point mutation of theLPLgene were acclimatised to a semi-purified diet containing TAG oil for 21 d. After assignment into two groups, pair-matched by serum TAG concentrations (range 6·1–31·6 mmol/l), the cats were fed the diet with either TAG or DAG oil for 8 d. The dietary fat source was crossed-over and presented for 8 d more. Non-fasting serum concentrations of TAG, cholesterol and NEFA were measured on days 6–8 and days 14–16. Dietary fat source (DAGv.TAG) did not significantly affect food intake (491 (sem16)v.486 (sem14) kJ/kg0·67), body weight or serum concentrations (mmol/l) of TAG (37·1 (sem4·5)v.33·9 (sem3·4)), cholesterol (4·8 (sem0·3)v.4·8 (sem0·2)) and NEFA (1·4 (sem0·2)v.1·4 (sem0·2)). The results show that for a feeding trial of 8 d, DAG oil was well accepted and tolerated by cats but did not reduce hypertriacylglycerolaemia resulting from a deficiency of LPL catalytic activity.

Muñoz, Enrique, Juan C. Gutiérrez-Vejar e Pedro I. Tume-Zapata. "Incertidumbre en los caudales de salida de un modelo hidrológico semidistribuido". Tecnología y ciencias del agua 09, n. 2 (1 aprile 2018): 150–74. http://dx.doi.org/10.24850/j-tyca-2018-02-06.

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Sahin, Abdurrahman, e Alemdar Bayraktar. "Computational finite element model updating tool for modal testing of structures". Structural Engineering and Mechanics 51, n. 2 (25 luglio 2014): 229–48. http://dx.doi.org/10.12989/sem.2014.51.2.229.

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Campos, Sérgio, Márcio Teixeira, Marius Minea, Andreas Kuehlmann e Edmund Clarke. "Model Checking Semi-Continuous Time Models Using BDDs". Electronic Notes in Theoretical Computer Science 23, n. 2 (dicembre 2001): 75–87. http://dx.doi.org/10.1016/s1571-0661(04)80670-4.

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Borkowski, Mateusz. "Social Capital and Economic Development: PLS-SEM Model". Gospodarka Narodowa 314, n. 2 (30 giugno 2023): 11–27. http://dx.doi.org/10.33119/gn/163005.

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Celem artykułu jest pomiar kapitału społecznego oraz określenie jego oddziaływania na rozwój gospodarczy wybranych gospodarek europejskich w latach 2017–2020. W pracy wykorzystano metodę modelowania równań strukturalnych z wykorzystaniem cząstkowych najmniejszych kwadratów (PLS-SEM), która umożliwia pomiar oraz identyfikację związków pomiędzy zmiennymi ukrytymi (bezpośrednio nieobserwowalnymi). Ustalono, że zaufanie społeczne jest bardziej determinowane przez zaufanie interpersonalne niż przez zaufanie względem organizacji. Ponadto stwierdzono, że zaufanie społeczne jest najważniejszym elementem ogólnej miary kapitału społecznego. Mniej ważnym w formowaniu tej zmiennej okazała się zmienna społecznych interakcji i postaw. Ustalono także, że pomiędzy zmiennymi kapitału społecznego i rozwoju gospodarczego występuje silny dodatni i istotny statystycznie związek.

Yalan, Xu, e Chen Jianjun. "Modal-based model reduction and vibration control for uncertain piezoelectric flexible structures". Structural Engineering and Mechanics 29, n. 5 (30 luglio 2008): 489–504. http://dx.doi.org/10.12989/sem.2008.29.5.489.

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Nguyễn, Hải Quang, Dũng Bảo Trung Lê e Quốc Anh Vũ. "So sánh ứng xử khung thép có liên kết nửa cứng phi tuyến theo mô hình Richard – Abbott và mô hình Lui – Chen chịu tải trọng động". Vietnam Institute for Building Science and Technology 2024, vi.vol1 (marzo 2024): 34–40. http://dx.doi.org/10.59382/j-ibst.2024.vi.vol1-5.

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This article presents two semi - rigid connection models commonly used in behavior analysis of semi - rigid connection steel frames subjected to dynamic loads that is the Richard - Abbott model and the Lui - Chen model. Compare the moment and rotation relationship curves of the same connection according to the Richard - Abbott model and the Lui - Chen model. Propose an algorithm to update the stiffness connection to calculate nonlinear semi - rigid connection steel frames. The proposed algorithm is also verified by comparing the results of calculating the semi-rigid linear steel frame using the ASSF calculation program in Mathlab, which created by the authors, with SAP 2000 software. Provide an example of calculation of a nonlinear semi - rigid connected steel frame subjected to dynamic loads and compare the calculation results between the Richard - Abbott model and the Lui - Chen model and give comments and recommendations.

Più fonti

Tesi sul tema "SEMK model":

Chakkingal, Anoop. "Réglage de la sélectivité de la synthèse Fischer-Tropsch : aperçu de la modélisation microcinétique et de l'apprentissage automatique". Electronic Thesis or Diss., Centrale Lille Institut, 2022. http://www.theses.fr/2022CLIL0015.

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En vue de promouvoir l’économie circulaire, de nombreux procédés chimiques sont actuellement réexaminés afin de développer des variantes plus durables. Cela a mené à une forte augmentation de production au cours des 60 dernières années, entraînant une production totale de 367 millions de tonnes en 2020.La méthodologie a ensuite été généralisée à l’aide d’apprentissage automatique non supervisé, ce qui a permis de dépasser les trois dimensions et de réduire le besoin d’intervention humaine. L’espace des descripteurs généré à partir de données microcinétiques (catalyseurs virtuels) est exploré en utilisant la méthode systématique du regroupement (clustering) et du classement (labelling) non supervisés. L’espace de la performance du catalyseur est regroupé en clusters et le nombre minimale de clusters est identifié. Chaque catalyseur virtuel (représenté par une certaine combinaison de descripteurs) est identifié du point de vue du cluster auquel il appartient. Il est ainsi possible d’obtenir l’étendue des valeurs des descripteurs dans le cluster ayant le meilleur rendement d’alcènes légers. Il est observé que les valeurs obtenues sont conformes à celles du catalyseur virtuel optimal identifié dans l’inspection visuelle précédente. On peut donc conclure qu’une méthode combinant la microcinétique et l’apprentissage automatique a été présentée pour le développement des catalyseurs et pour l’investigation détaillée de leurs propriétés, tout en diminuant le besoin d’intervention humaine.Finalement, la méthode d’apprentissage automatique a été étendue dans l’intention de pouvoir réaliser des prédictions de plusieurs sélectivités en se concentrant sur la production des alcènes légers à différentes conditions opérationnelles. Afin d’atteindre cet objectif, 4 modèles d’apprentissage automatique alternatifs ont été employés, i.e. la méthode lasso (lasso regression), la méthode des k plus proches voisins (k nearest neighbor regression ou KNN), la méthode de la machine à vecteurs de support (support vector machine regression ou SVR) et le réseau de neurones artificiels (Artificial Neural Network ou ANN). Les capacités de ces techniques sont évaluées par rapport à la reproduction du comportement linéaire de la conversion et la sélectivité en fonction des variables du procédé comme cela a été simulé par le modèle SEMK. Il est constaté que les modèles à base d’un réseau de neurones artificiels correspondent le plus aux résultats de référence du modèle SEMK. Une analyse supplémentaire utilisant la technique d’interprétation de la valeur SHAP a été appliquée aux modèles à base d’un réseau de neurones artificiels ayant la meilleure performance, en vue de mieux expliquer le fonctionnement des modèles.L’ensemble de l’étude a rapporté des connaissances essentielles, telles que les descripteurs de catalyseur optimales : les enthalpies de chimisorption atomique de l’hydrogène (QH ≈ 234 kJ/mol), du carbone (QC ≈ 622 kJ/mol) et de l’oxygène (QO ≈ 575 kJ/mol), pour la conception de catalyseurs ayant une sélectivité en alcènes légers élevée en utilisant un modèle SEMK mécaniste. De plus, l’étendue des conditions opérationnelles menant à la meilleure sélectivité en alcènes légers a été déterminée en adoptant plusieurs stratégies de modélisation (le concept des SEMK et l’apprentissage automatique). Il a été constaté que les effets de la température (580-620K) et la pression (1-2 bar) étaient les plus importants. Ensuite, une investigation est réalisée dans le but d’évaluer à quel point les résultats des modèles d’apprentissage automatique correspondent à ceux du modèle SEMK. Par exemple, une analyse préliminaire a pu être réalisée en utilisant un modèle d’apprentissage automatique pour l’analyse des données obtenues à l’aide d’expérimentation à haut débit. Ensuite, le modèle mécaniste a permis d’acquérir une compréhension chimique approfondie
Striving towards a circular economy has led to the re-investigation of many existing processes, with the target of developing more sustainable variants. In our present economy, plastics form an important and omnipresent material affecting our daily lives. They are inexpensive, durable, corrosion resistant, and light weight leading to their use in a wide variety of applications.Within the plastic chemical recycling scheme, Fischer-Tropsch synthesis (FTS) could play a key role as the syngas feedstock that is converted in it, can be generated via the gasification of the considered plastics. This syngas is then chemo-catalytically converted into hydrocarbons such as paraffins and light olefins. Typical FTS catalysts are based on supported cobalt or iron species.Among the mechanistic kinetic models, the comprehensive variant based on the Single Event MicroKinetics (SEMK) concept has been widely applied in the field of oligomerization, autoxidative curing, etc. and has proven to be a versatile tool to simulate Fischer-Tropsch synthesis. However, developing mechanistic models for every chemical engineering challenge is not always feasible due to their complexity and the in-depth knowledge required to build such models.A detailed evaluation on the potential of using machine learning approaches to match the performance of results obtained using the Single-Event MicroKinetic model was carried out. Initially, the focus was on a single dominant output scenario (methane selective catalyst). The current work thus shows that more widely applied techniques in data science can now be applied for systematic analysis and interpretation of kinetic data. Similar analysis using experimental data can also help experimenters in their preliminary analysis, to detect hidden trends in the data, and thus to identify importance features. After gaining confidence on the investigated interpretation techniques, for the FTS reaction with single dominant output, a similar investigation on the potential of iron based catalysts with enhanced light olefin selectivity is carried out next

Dhurandhar, Amit. "Semi-analytical method for analyzing models and model selection measures". [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024733.

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Yu, Fu. "On statistical analysis of vehicle time-headways using mixed distribution models". Thesis, University of Dundee, 2014. https://discovery.dundee.ac.uk/en/studentTheses/d101df63-b7db-45b6-8a03-365b64345e6b.

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For decades, vehicle time-headway distribution models have been studied by many researchers and traffic engineers. A good time-headway model can be beneficial to traffic studies and management in many aspects; e.g. with a better understanding of road traffic patterns and road user behaviour, the researchers or engineers can give better estimations and predictions under certain road traffic conditions and hence make better decisions on traffic management and control. The models also help us to implement high-quality microscopic traffic simulation studies to seek good solutions to traffic problems with minimal interruption of the real traffic environment and minimum costs. Compared within previously studied models, the mixed (SPM and GQM) mod- els, especially using the gamma or lognormal distributions to describe followers headways, are probably the most recognized ones by researchers in statistical stud- ies of headway data. These mixed models are reported with good fitting results indicated by goodness-of-fit tests, and some of them are better than others in com- putational costs. The gamma-SPM and gamma-GQM models are often reported to have similar fitting qualities, and they often out-perform the lognormal-GQM model in terms of computational costs. A lognormal-SPM model cannot be formed analytically as no explicit Laplace transform is available with the lognormal dis- tribution. The major downsides of using mixed models are the difficulties and more flexibilities in fitting process as they have more parameters than those single models, and this sometimes leads to unsuccessful fitting or unreasonable fitted pa- rameters despite their success in passing GoF tests. Furthermore, it is difficult to know the connections between model parameters and realistic traffic situations or environments, and these parameters have to be estimated using headway samples. Hence, it is almost impossible to explain any traffic phenomena with the param- eters of a model. Moreover, with the gamma distribution as the only common well-known followers headway model, it is hard to justify whether it has described the headway process appropriately. This creates a barrier for better understanding the process of how drivers would follow their preceding vehicles. This study firstly proposes a framework developed using MATLAB, which would help researchers in quick implementations of any headway distributions of interest. This framework uses common methods to manage and prepare headway samples to meet those requirements in data analysis. It also provides common structures and methods on implementing existing or new models, fitting models, testing their performance hence reporting results. This will simplify the development work involved in headway analysis, avoid unnecessary repetitions of work done by others and provide results in formats that are more comparable with those reported by others. Secondly, this study focuses on the implementation of existing mixed models, i.e. the gamma-SPM, gamma-GQM and lognormal-GQM, using the proposed framework. The lognormal-SPM is also tested for the first time, with the recently developed approximation method of Laplace transform available for lognormal distributions. The parameters of these mixed models are specially discussed, as means of restrictions to simplify the fitting process of these models. Three ways of parameter pre-determinations are attempted over gamma-SPM and gamma-GQM models. A couple of response-time (RT) distributions are focused on in the later part of this study. Two RT models, i.e. Ex-Gaussian (EMG) and inverse Gaussian (IVG) are used, for first time, as single models to describe headway data. The fitting performances are greatly comparable to the best known lognormal single model. Further extending this work, these two models are tested as followers headway distributions in both SPM and GQM mixed models. The test results have shown excellent fitting performance. These now bring researchers more alternatives to use mixed models in headway analysis, and this will help to compare the be- haviours of different models when they are used to describe followers headway data. Again, similar parameter restrictions are attempted for these new mixed models, and the results show well-acceptable performance, and also corrections on some unreasonable fittings caused by the over flexibilities using 4- or 5- parameter models.

Goes, Adriano Almeida 1978. "Modelo de propagação empírico para sistemas RFID passivo = Emprirical propagation model for RFID passive systems". [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261045.

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Orientador: Paulo Cardieri
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação
Made available in DSpace on 2018-08-26T02:54:38Z (GMT). No. of bitstreams: 1 Goes_AdrianoAlmeida_D.pdf: 4041752 bytes, checksum: 3aebfc7442e100b6011a6873be01c5f9 (MD5) Previous issue date: 2014
Resumo: Resultados de campanhas de medição realizadas visando o desenvolvimento de uma fer-ramenta para o projeto, implantação e análise de sistemas de RFID são mostrados nesse traba-lho. Particularmente, a perda de percurso de rádio a partir de um leitor de RFID até um TAG, e de volta para o leitor é caracterizada na banda 915 MHz, para diferentes distâncias de separação leitor-TAG, alturas de TAG e de antena do leitor. Vários cenários de propagação foram considerados, incluindo ambientes exteriores e in-teriores, para os quais foi colhido um extenso número medidas. Os dados de campo são, então, comparados a uma versão melhorada do modelo clássico perda caminho 2-ray, ajustada para incluir também os padrões de radiação da antena não omnidirecionais no leitor. Além disso, foi investigado, por meio da análise de medidas de campo, o efeito da mobi-lidade do TAG no sinal recebido no leitor. Para a coleta das medidas, foi construído um aparato composto de uma esteira de velocidade controlada, onde foram instalados TAGs de teste. Os resultados de medida mostraram que a mobilidade do TAG provoca uma diminuição do valor médio e um aumento da variância do sinal recebido no leitor. Essa atenuação extra e a variância do sinal não são fortemente afetadas pelo valor da velocidade. Por fim, esses efeitos de propagação são incorporados em um modelo matemático, que pode ser utilizado para a simulação e planejamento de sistemas RFID
Abstract: Results of measurement campaigns carried out aiming at the development of a tool for design, deployment, and analysis of RFID systems are shown. Particularly, the radio path loss from an RFID reader towards the test TAG and back to the reader is characterized at the 915 MHz band. The path loss is estimated based on the received signal strength measured at the reader, for different reader¿TAG separation distances and different antenna TAG heights. Several propagation scenarios have been considered, including outdoor and indoor environments for which an extensive number of typical real manufacturing plants have been chosen. The field data are then compared to a proposed novel, improved version of the classical 2-ray path loss model, adjusted to include non-omnidirectional antenna radiation patterns at the reader. In addition, the effect of TAG mobility in the received signal at the reader was also investigated, by means of field measurements. To collect the field measurements, an apparatus was designed and constructed, consisting of a mat of controlled speed, on which test TAGs were installed. The results showed that TAG mobility decreases the average value increases the variance of the received signal at the reader. This extra attenuation and the increased variance of the signal are not strongly affected by the value of speed. Finally, these two effects are incorporated into a mathematical model that can be used for simulation and planning of RFID systems
Doutorado
Telecomunicações e Telemática
Doutor em Engenharia Elétrica

Nwi-Mozu, Isaac. "Robustness of Semi-Parametric Survival Model: Simulation Studies and Application to Clinical Data". Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etd/3618.

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An efficient way of analyzing survival clinical data such as cancer data is a great concern to health experts. In this study, we investigate and propose an efficient way of handling survival clinical data. Simulation studies were conducted to compare performances of various forms of survival model techniques using an R package ``survsim". Models performance was conducted with varying sample sizes as small ($n5000$). For small and mild samples, the performance of the semi-parametric outperform or approximate the performance of the parametric model. However, for large samples, the parametric model outperforms the semi-parametric model. We compared the effectiveness and reliability of our proposed techniques using a real clinical data of mild sample size. Finally, systematic steps on how to model and explain the proposed techniques on real survival clinical data was provided.

Pouliot, George. "A Variable Resolution Nonhydrostatic Global Atmospheric Semi-implicit Semi-Lagrangian Model". NCSU, 2000. http://www.lib.ncsu.edu/theses/available/etd-20000403-180910.

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ABSTRACTPOULIOT, GEORGE. A Variable Resolution Nonhydrostatic Global Atmospheric Semi-implicit Semi-Lagrangian Model. (Under the direction of Dr. Fredrick H.M. Semazzi.)The objective of this project is to develop a variable-resolution finite difference adiabatic global nonhydrostatic semi-implicit semi-Lagrangian (SISL) model based on the fully compressible nonhydrostatic atmospheric equations. To achieve this goal, a three-dimensional variable resolution dynamical core was developed and tested.The main characteristics of the dynamical core can be summarized as follows: Spherical coordinates were used in a global domain. A hydrostatic/nonhydrostatic switch was incorporated into the dynamical equations to use the fully compressible atmospheric equations. A generalized horizontal variable resolution grid was developed and incorporated into the model. For a variable resolution grid, in contrast to a uniform resolution grid, the order of accuracy of finite difference approximations is formally lost but remains close to the order of accuracy associated with the uniform resolution grid provided the grid stretching is not too significant. The SISL numerical scheme was implemented for the fully compressible set of equations. In addition, the generalized minimum residual (GMRES) method with restart and preconditioner was used to solve the three-dimensional elliptic equation derived from the discretized system of equations. The three-dimensional momentum equation was integrated in vector-form to incorporate the metric terms in the calculations of the trajectories. Using global re-analysis data for a specific test case, the model was compared to similar SISL models previously developed. Reasonable agreement between the model and the other independently developed models was obtained. The Held-Suarez test for dynamical cores was used for a long integration and the model was successfully integrated for up to 1200 days. Idealized topography was used to test the variable resolution component of the model. Nonhydrostatic effects were simulated at grid spacings of 400 meters with idealized topography and uniform flow. Using a high-resolution topographic data set and the variable resolution grid, sets of experiments with increasing resolution were performed over specific regions of interest. Using realistic initial conditions derived from re-analysis fields, nonhydrostatic effects were significant for grid spacings on the order of 0.1 degrees with orographic forcing. If the model code was adapted for use in a message passing interface (MPI) on a parallel supercomputer today, it was estimated that a global grid spacing of 0.1 degrees would be achievable for a global model. In this case, nonhydrostatic effects would be significant for most areas.A variable resolution grid in a global model provides a unified and flexible approach to many climate and numerical weather prediction problems. The ability to configure the model from very fine to very coarse resolutions allows for the simulation of atmospheric phenomena at different scales using the same code. We have developed a dynamical core illustrating the feasibility of using a variable resolution in a global model.

Silva, Marcelo Ferreira da. "Densidade espectral para o modelo de Anderson de duas impurezas sem correlação eletrônica". Universidade de São Paulo, 1998. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-07052014-145918/.

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Este trabalho calcula analítica e numericamente a densidade espectral para o modelo de Anderson de duas impurezas sem correlação eletrônica (U=0). Nossos resultados servem como passo inicial para se entender o modelo com a correlação eletrônica. O modelo estudado descreve a interação entre elétrons de um metal e impurezas magnéticas localizadas, e a simplificação, U = 0, torna o Hamiltoniano quadrático permitindo assim que se divida o mesmo em dois termos: um envolvendo apenas operadores pares (canal par) e outro envolvendo apenas operadores ímpares (canal ímpar). Cada termo encontrado difere pouco do Hamiltoniano de Nível Ressonante. Nossos resultados abrangem tanto a diagonalização analítica como a numérica pelo método do Grupo de Renormalização, adaptado para o caso de duas impurezas. A simplicidade do Hamiltoniano permite que (1) se identifique características do modelo que afetam adversamente a precisão do cálculo numeríco e (2) se encontre uma maneira de circundar tais dificuldades. Os resultados aqui encontrados ajudaram o desenvolvimento do cálculo da densidade espectral do modelo correlacionado, desenvolvido paralelamente em nosso grupo de pesquisa.
This work calculates analytically and numerically the spectral density for the two impurity uncorrelated Anderson model (U = O). Our results serve as an initial step towards understanding models with electronic correlation. The studied model describes the interaction between conduction-band electrons of a metal and localized magnetic impurities. The simplification U = O turns the Hamiltonian quadratic, allowing us to split it into two parts: one involving only even operators (even channel), the other involving odd operators (odd channel). Each term has a form differing a little from that for the Resonant Level Hamiltonian. Our results include analytic diagonalization as well as numerical calculations using the method of the Renormalization Group, adapted for the two impurity case. The traditional tridiagonalization method imposes particle-hole symmetry, while our treatment preserves the energy dependence of the coupling, between the impurities and the conduction-band, and consequently, the natural asymmetry of the model. The simplicity of the Hamiltonian allowed us to (1) identify characteristics of the model that affect adversely the acuracy of the numeric calculation and (2) find a way to surround such difficulties. The results here found helped the development of the calculation of the spectral density of the correlated model, developed simultaneously in our research group.

Ramos, Luís Roberto. "Propriedades termodinâmicas do Modelo de Falicov-Kimball de duas impurezas sem spin". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-03062014-103216/.

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Neste trabalho estudamos o modelo de Falicov-Kimball, que descreve duas impurezas sem spin, localizadas e hibridizadas com elétrons de condução de um metal hospedeiro, o que faz com que a valência flutuante seja algo intrínseco do modelo. Os estados de condução são, também, espalhados eletrostaticamente quando uma carga estiver presente nos níveis locais das impurezas. O estudo foi realizado através do cálculo de propriedades termo dinâmicas do modelo, mais precisamente, da análise do calor específico e da suscetibilidade de carga em função da temperatura e para vários parâmetros diferentes do modelo. Para a obtenção do espectro de energias do Hamiltoniano que descreve o modelo, do qual as propriedades termodinâmicas são obtidas, utilizamos o Grupo de Renormalização Numérico com dois parâmetros de discretização. Em nossos estudos, mostramos alguns resultados que vão além da usual aproximação que projeta todos os momentos no nível de Fermi. Começamos nosso estudo da termodinâmica do modelo analisando regiões do espaço de parâmetros onde o Hamiltoniano toma-se mais simples (regiões onde não há hibridização ou espalhamento eletrostático) e, então, interpretações mais simples dos dados são possíveis. Verificamos, por exemplo, que quando a hibridização é diferente de zero o sistema se comporta como líquido de Fermi para temperaturas indo à zero. Para algumas escolhas de parâmetros o sistema tem o comportamento de férmions pesados. Outro ponto a se destacar é que a razão de Wilson, definida aqui como a divisão da suscetibilidade de carga pelo calor específico, tem o valor universal R = 1, quando a hibridização está presente.
In this work, we study the Falicov-Kimball model with two localized spinless impurities hybridized with conduction electrons of a host metal, therefore, valence fluctuation is intrinsic to the model. The conduction states are also electrostatically scattered whenever a charge is present em the local levels of the impurities. The study was realized computing thermodynamics properties of the model, more specifically, we analyze the temperature dependent specific heat end charge susceptibility for many different parameters of the model. The Numerical Renormalization Group with two discretization parameters is used to obtain the spectrum of the model, from what the thermodynamics is obtained. We discuss the importance of going beyond the usual approximation that projects all moment at the Fermi Level. We begun our study of the thermodynamical properties analyzing values of the parameters space, where the model becomes quadratic (that is, where hybridization or Coulomb scattering are absent), and thus simple interpretations of the data are possible. We verified, for example, that for non-zero hybridization, the system shows Fermi liquid behavior at low temperature. The Wilson ratio, defined here with the charge susceptibility instead of magnetic one, has the universal value R = 1, whenever the hybridization is present. For some choices of the model parameters the model behaviors like heavy fermion.

Wendler, Tim Glenn. "Algebraic Semi-Classical Model for Reaction Dynamics". BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5755.

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We use an algebraic method to model the molecular collision dynamics of a collinear triatomic system. Beginning with a forced oscillator, we develop a mathematical framework upon which inelastic and reactive collisions are modeled. The model is considered algebraic because it takes advantage of the properties of a Lie algebra in the derivation of a time-evolution operator. The time-evolution operator is shown to generate both phase-space and quantum dynamics of a forced oscillator simultaneously. The model is considered semi-classical because only the molecule's internal degrees-of-freedom are quantized. The relative translation between the colliding atom and molecule in an exchange reaction (AB+C ->A+BC) contains no bound states and any possible tunneling is neglected so the relative translation is treated classically. The purpose of this dissertation is to develop a working model for the quantum dynamics of a collinear reactive collision. After a reliable model is developed we apply statistical mechanics principles by averaging collisions with molecules in a thermal bath. The initial Boltzmann distribution is of the oscillator energies. The relative velocities of the colliding particles is considered a thermal average. Results are shown of quantum transition probabilities around the transition state that are highly dynamic due to the coupling between the translational and transverse coordinate.

Bulla, Jan. "Application of Hidden Markov and Hidden Semi-Markov Models to Financial Time Series". Doctoral thesis, [S.l. : s.n.], 2006. http://swbplus.bsz-bw.de/bsz260867136inh.pdf.

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Più fonti

Libri sul tema "SEMK model":

Janssen, Jacques, a cura di. Semi-Markov Models. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1.

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H, Bakker. Enthalpies in alloys: Miedemas̓ semi-empirical model. Uetikon-Zuerich, Switzerland: Trans Tech Publications, 1998.

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United States. National Aeronautics and Space Administration., a cura di. Cellular monotectic model solidification: Semi-annual report. [Washington, DC: National Aeronautics and Space Administration, 1987.

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Janssen, Jacques, e Nikolaos Limnios, a cura di. Semi-Markov Models and Applications. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4613-3288-6.

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Milholen, William E. Computational analysis of semi-span model test techniques. Hampton, Virginia: National Aeronautics and Space Administration, Langley Research Center, 1996.

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McCallum, Bennett T. A semi-classical model of price level adjustment. Cambridge, Mass: National Bureau of Economic Research, 1994.

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International Symposium on Semi-Markov Processes and Their Applications (1984 Brussels, Belgium). Semi-Markov models: Theory and applications. New York: Plenum Press, 1986.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., a cura di. Model reduction by trimming for a class of semi-Markov reliability models and the corresponding error bound. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1991.

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Elliott, K. H. A computer simulation model of semi-worsted yarn manufacture. Christchurch: WRONZ, 1986.

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Elliott, K. H. A computer simulation model of semi-worsted yarn manufacture. Christchurch: WRONZ, 1986.

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Capitoli di libri sul tema "SEMK model":

Kussmaul, Paul. "Semantic models and translation". In Handbook of Translation Studies, 309–13. Amsterdam: John Benjamins Publishing Company, 2010. http://dx.doi.org/10.1075/hts.1.sem1.

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Ney, Peter, e Esa Nummelin. "Some limit theorems for Markov additive processes". In Semi-Markov Models, 3–12. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_1.

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Balcer, Yves, e Izzet Sahin. "Pension accumulation as a semi-Markov reward process, with applications to pension reform". In Semi-Markov Models, 181–99. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_10.

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Schager, Nils Henrik. "The structure of a firm’s optimal non-decreasing wage policy when recruitment is a wage dependent Poisson process". In Semi-Markov Models, 201–13. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_11.

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Korolyuk, V. S. "Markov renewal processes in reliability analysis". In Semi-Markov Models, 217–30. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_12.

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Abdel-Hameed, Mohamed. "Deterioration processes". In Semi-Markov Models, 231–52. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_13.

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Franken, Peter, e Arnfried Streller. "Stochastic processes with an embedded point process and their application to system reliability analysis". In Semi-Markov Models, 253–79. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_14.

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McClean, Sally. "Semi-Markov models for manpower planning". In Semi-Markov Models, 283–300. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_15.

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Keiding, Niels. "Statistical analysis of semi-Markov processes based on the theory of counting processes". In Semi-Markov Models, 301–15. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_16.

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Kalashnikov, V. V. "Approximation of some stochastic models". In Semi-Markov Models, 319–35. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0574-1_17.

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Atti di convegni sul tema "SEMK model":

Farwick, Matthias, Christian M. Schweda, Ruth Breu e Inge Hanschke. "A situational method for semi-automated enterprise architecture documentation (SoSyM abstract)". In 2015 ACM/IEEE 18th International Conference on Model Driven Engineering Languages and Systems (MODELS). IEEE, 2015. http://dx.doi.org/10.1109/models.2015.7338278.

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Rogie, B., S. Grosjean, E. Monier-Vinard, V. Bissuel, F. Joly, O. Daniel, N. Laraqi e K. Vera. "Delphi-like dynamical compact thermal models using model order reduction based on modal approach". In 2018 34th Thermal Measurement, Modeling & Management Symposium (SEMI-THERM). IEEE, 2018. http://dx.doi.org/10.1109/semi-therm.2018.8357347.

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Ferreira, Filipe, Paulo Monteiro e Henrique Silva. "Semi-analytical model for linear modal coupling in few-mode fiber transmission". In 2012 14th International Conference on Transparent Optical Networks (ICTON). IEEE, 2012. http://dx.doi.org/10.1109/icton.2012.6254446.

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"A MDE Framework for Semi-automatic Development of Web Applications". In International Conference on Model-Driven Engineering and Software Development. SciTePress - Science and and Technology Publications, 2013. http://dx.doi.org/10.5220/0004321302410246.

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Fockel, Markus, David Schubert, Roman Trentinaglia, Hannes Schulz e Wolfgang Kirmair. "Semi-automatic Integrated Safety and Security Analysis for Automotive Systems". In 10th International Conference on Model-Driven Engineering and Software Development. SCITEPRESS - Science and Technology Publications, 2022. http://dx.doi.org/10.5220/0010778500003119.

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Cioban, R., Sz Szoke, Z. Koradi, D. Zaharie-B. e C. Leordean. "Validated Model Calibration for Simulation Aided Thermal Design". In 2020 36th Semiconductor Thermal Measurement, Modeling & Management Symposium (SEMI-THERM). IEEE, 2020. http://dx.doi.org/10.23919/semi-therm50369.2020.9142853.

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Del Fabro, Marcos Didonet, e Patrick Valduriez. "Semi-automatic model integration using matching transformations and weaving models". In the 2007 ACM symposium. New York, New York, USA: ACM Press, 2007. http://dx.doi.org/10.1145/1244002.1244215.

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Park, Seongsik, Il Hong Suh e Wan Kyun Chung. "Dynamic motion phase segmentation using sEMG during countermovement jump based on hidden semi-Markov model". In 2015 IEEE International Conference on Robotics and Automation (ICRA). IEEE, 2015. http://dx.doi.org/10.1109/icra.2015.7139382.

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Osama, Mohamed, Aya Zaki-Ismail, Mohamed Abdelrazek, John Grundy e Amani Ibrahim. "SRCM: A Semi Formal Requirements Representation Model Enabling System Visualisation and Quality Checking". In 9th International Conference on Model-Driven Engineering and Software Development. SCITEPRESS - Science and Technology Publications, 2021. http://dx.doi.org/10.5220/0010271202780285.

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Zhang, Weixing, Regina Hebig, Jan-Philipp Steghöfer e Jörg Holtmann. "Creating Python-Style Domain Specific Languages: A Semi-Automated Approach and Intermediate Results". In 11th International Conference on Model-Based Software and Systems Engineering. SCITEPRESS - Science and Technology Publications, 2023. http://dx.doi.org/10.5220/0011744900003402.

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Rapporti di organizzazioni sul tema "SEMK model":

Zyphur, Michael. Intermediate SEM in Stata: From CFA to SEM. Instats Inc., 2022. http://dx.doi.org/10.61700/9qo0ssbbzp4nl469.

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This seminar introduces the Stata ‘sem’ latent variable modeling framework and explores measurement models including bi-factor and hierarchical factor models and scale reliability in CFA, as well as SEMs with latent variable interactions (moderation), indirect effects (mediation), latent conditional indirect effects (moderated mediation), and latent instrumental variable methods in an SEM framework (IV-SEM). An official Instats certificate of completion is provided at the conclusion of the seminar. For European PhD students, each seminar offers 2 ECTS Equivalent points.

Zyphur, Michael. From CFA to SEM with Moderated Mediation in R. Instats Inc., 2022. http://dx.doi.org/10.61700/75sjvfs0ve1d4469.

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Abstract (sommario):

This seminar introduces the Lavaan latent variable modeling framework and explores measurement models including bi-factor and hierarchical factor models and scale reliability in CFA, as well as SEMs with latent variable interactions (moderation), indirect effects (mediation), latent conditional indirect effects (moderated mediation), and latent instrumental variable methods in an SEM framework (IV-SEM). An official Instats certificate of completion is provided at the conclusion of the seminar. For European PhD students, the seminar offers 2 ECTS Equivalent point.

Zyphur, Michael. From CFA to SEM with Moderated Mediation in Mplus. Instats Inc., 2022. http://dx.doi.org/10.61700/a6tru90pc9miu469.

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Abstract (sommario):

This seminar introduces the Mplus latent variable modeling framework and explores measurement models including bi-factor and hierarchical factor models and scale reliability in CFA, as well as SEMs with latent variable interactions (moderation), indirect effects (mediation), latent conditional indirect effects (moderated mediation), and latent instrumental variable methods in an SEM framework (IV-SEM). An official Instats certificate of completion is provided at the conclusion of the seminar. For European PhD students, the seminar offers 2 ECTS Equivalent point.

Zyphur, Michael. From CFA to SEM with Moderated Mediation in R (Free On-Demand Seminar). Instats Inc., 2022. http://dx.doi.org/10.61700/xria1if8u3nip469.

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Zhang, Zhen. From CFA to SEM with Moderated Mediation in Mplus. Instats Inc., 2022. http://dx.doi.org/10.61700/e6lwwzg27rqsr469.

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Zhang, Zhen. Longitudinal SEM in Mplus (Free with Course Purchase). Instats Inc., 2023. http://dx.doi.org/10.61700/qbnb0rzkq0afl469.

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This seminar introduces longitudinal panel data models in Mplus using SEM, including latent growth models (i.e., latent curve or latent trajectory models) and cross-lagged panel models (i.e., panel vector autoregression) with random and fixed effects, including the random intercept cross-lagged panel model (RI-CLPM) to assess time-varying and stable relationships. Short-run and long-run effects will be covered and methods for assessing them provided. An official Instats certificate of completion is provided at the conclusion of the seminar. For European PhD students, the seminar offers 2 ECTS Equivalent point.

Zhang, Zhen. Longitudinal SEM in Mplus: Latent Growth and Cross-Lagged Models. Instats Inc., 2022. http://dx.doi.org/10.61700/shmr7uf60jtgi469.

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Olsen e Willson. L51916 Pressure Based Parametric Emission Monitoring Systems (PEMS). Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), aprile 2002. http://dx.doi.org/10.55274/r0010181.

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The natural gas industry operates over 8000 stationary large bore (bore greater than 14 in) natural gas engines for natural gas compression on pipelines and power generation. As emissions regulations become increasingly more stringent, the need for low cost methods for compliance demonstration arises. A PEMS model is one such approach. Research in this area has increased significantly during the last decade. PEMS models for this application utilize parameters commonly measured on industrial engines in the field to predict engine-out emissions. Monitoring emissions in this manner represents a significant cost savings over the periodic use of chemiluminescence NOX analyzers, which are not standard equipment in natural gas compressor stations. PEMS model accuracy is dependent on the quality of the input data, both the training NOX measurements and the selection of input parameters. Hence, it is important to have both reliable data measurement methods and an understanding of engine operating parameters relation to NOX. This work is part of the body of work referred to as the Integrated Test Plan (ITP), performed at the Engines and Energy Conversion Laboratory (EECL). This report details an investigation into Parametric Emissions Monitoring System (PEMS) models. It is the final document to be delivered under the ITP program. Much of the work performed under the ITP program focused on Hazardous Air Pollutants (HAPs) research. However, the emphasis of the PEMS work is on the prediction of oxides of nitrogen (NOX) emissions from large bore natural gas engines. In this work two different PEMS models are developed, a semi-empirical model and a neural network model. The semi-empirical model is based on general relationships between NOX emissions and engine parameters, but contains empirical constants that are determined based on the best fit to engine experimental data. The neural network model utilizes a similar set of input parameters, but relies on the neural network code to determine the relationships between input parameters and measured NOX emissions. The neural network model also contains empirical constants. The mathematics involved in both models is described. A single term semi-empirical model, which has been utilized in the literature as a PEMS model, is applied for comparative purposes.

Hogan, Timothy F. Semi-Lagrangian Global Models. Fort Belvoir, VA: Defense Technical Information Center, settembre 2008. http://dx.doi.org/10.21236/ada532883.

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Hogan, Timothy F. Semi-Lagrangian Global Models. Fort Belvoir, VA: Defense Technical Information Center, settembre 2007. http://dx.doi.org/10.21236/ada541539.

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