Relevant bibliographies by topics / Em modelling

Academic literature on the topic 'Em modelling'

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Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Em modelling"

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Cepīte, D., A. Jakovičs, B. Halbedel, and U. Krieger. "Modelling of EM glass convection." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 27, no. 2 (March 7, 2008): 387–98. http://dx.doi.org/10.1108/03321640810847670.

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Greasley, A. "Simulation modelling in manufacturing process design." Engineering Management Journal 9, no. 4 (1999): 187. http://dx.doi.org/10.1049/em:19990405.

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Koubbi, Philippe, Christophe Loots, Gwenaelle Cotonnec, Xavier Harlay, Alain Grioche, Sandrine Vaz, Corinne Martin, Mike Walkey, and Andre Carpentier. "Spatial patterns and GIS habitat modelling of Solea solea, Pleuronectes flesus and Limanda limanda fish larvae in the eastern English Channel during the spring." Scientia Marina 70, S2 (October 30, 2006): 147–57. http://dx.doi.org/10.3989/scimar.2006.70s2147.

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Malhotra, Sony, Sylvain Träger, Matteo Dal Peraro, and Maya Topf. "Modelling structures in cryo-EM maps." Current Opinion in Structural Biology 58 (October 2019): 105–14. http://dx.doi.org/10.1016/j.sbi.2019.05.024.

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DOHERTY, J. "EM MODELLING USING SURFACE INTEGRAL EQUATIONS1." Geophysical Prospecting 36, no. 6 (August 1988): 644–68. http://dx.doi.org/10.1111/j.1365-2478.1988.tb02185.x.

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Tramontano, Marcelo, Juliano Pita, and Dayanna Mello Sousa. "Building Information Modelling em processos decisórios participativos." Design e Tecnologia 10, no. 21 (December 22, 2020): 54–69. http://dx.doi.org/10.23972/det2020iss21pp54-69.

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Este artigo apresenta e discute resultados parciais de uma pesquisa em andamento sobre o desenvolvimento de aplicativos computacionais conectados a programas computacionais de Building Information Modeling (BIM), visando a participação de atores não-técnicos em processos de tomada de decisão para projetos de equipamentos públicos. A pesquisa propõe a construção de um aplicativo de base web no qual possa realizar-se a colaboração remota entre técnicos e não-técnicos em processos de projeto arquitetônico. O artigo situa a relevância de tal colaboração em países recentemente industrializados em que a participação da população em decisões do Poder Público tem sido reivindicada por vários grupos, faz uma revisão das principais características do BIM, descreve a metodologia utilizada na pesquisa, e apresenta a proposta de aplicativo computacional em curso de desenvolvimento, com posterior descrição de experimentos práticos voltados a aprimorar e validar a proposta da plataforma. Por fim, estabelece relações entre a fundamentação da pesquisa e as observações realizadas, estabelecendo revisões e futuros direcionamentos no desenvolvimento da pesquisa. Esta pesquisa está sendo realizada em um grupo de pesquisa de uma universidade pública do Estado de São Paulo, incluindo professores, doutorandos e graduandos, e espera contribuir para a formulação e aplicação de políticas públicas nos setores envolvidos. O projeto deriva de resultados e conclusões de diversas pesquisas realizadas no grupo ao longo dos últimos 17 anos sobre temas como processos de design auxiliados pela computação, modos de vida e o conceito ampliado do habitar, ações culturais utilizando meios digitais, e o entendimento de processos de projeto como sistemas complexos
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Cen, Wei, Ralph Hoppe, Zhaoquan Cai, Zhuliang Yu, and Ning Gu. "Accurate 3D multi-material EM-thermal modelling." AIP Advances 7, no. 2 (February 2017): 025214. http://dx.doi.org/10.1063/1.4977742.

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M., HUBMANN, and SCHLETTERER M. "Development of a habitat preference curve for the mayfly Baetis alpinus (Pictet 1843)." Zoosymposia 11 (November 18, 2016): 65–72. http://dx.doi.org/10.11646/zoosymposia.11.1.10.

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Habitat modelling provides a quantitative tool to predict scenarios in order to implement conservation measures and is therefore recognised as an effective method for managing running waters. Combining abiotic characteristics (e.g. substrate) and the results of hydraulic models (most commonly water depth and depth-averaged velocity), habitat models can be applied. Different models are available (e.g. CASiMiR, PHABSIM), all of which require preference (or suitability) curves for the species of interest. Choosing a species for habitat modelling requires sound knowledge of its ecology and distribution. The mayfly Baetis alpinus is a widespread and abundant alpine species and therefore a useful indicator species in the context of habitat modelling. Based on abiotic factors and abundance of the species, preference curves were established using polynomial regression. We present the sampling design and data processing for the establishment of a preference curve for the mayfly Baetis alpinus, including a review of its ecology. The application in habitat modelling is exemplified and discussed. Especially for high alpine environments, where fish are absent, the use of macroinvertebrates in habitat modelling enables to make comparable analyses of different flow rates.
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Wakefield, J., and S. Morris. "BAYESIAN ERRORS-EM-VARIABLES MODELLING OF WATER CONSTITUENTS." Epidemiology 9, Supplement (July 1998): S31. http://dx.doi.org/10.1097/00001648-199807001-00042.

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Doherty, John. "A Surface Integral Equation Method For EM Modelling." Exploration Geophysics 18, no. 1-2 (March 1, 1987): 26–28. http://dx.doi.org/10.1071/eg987026.

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Dissertations / Theses on the topic "Em modelling"

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Jussila, T. (Tommi). "Modelling cancer: recapitulation of tumor growth in experimental systems in vivo and in vitro." Doctoral thesis, University of Oulu, 2000. http://urn.fi/urn:isbn:9514256433.

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Abstract The purpose of the study was to evaluate model systems of cancer development and compare some of their critical features with cancer development in vivo. Ovarian and endometrial cancers in man were used as correlates. Tumor development in experimental animals, exposed to carcinogens and UV irradiation, showed the entire spectrum of tumor development as compared to spontaneous carcinomas: hyperplasia, dysplasia, benign papillomas and malignant squamous cell carcinomas. For short-term analysis of differentiated homogenous cell populations, the transplant model proved most useful. For long term analysis of effects of extraneous agents, the skin carcinogenesis model is probably the most rewarding. Analysis of proliferation markers in human tumor samples as studied by immunohistochemistry, showed that an increased expression of PCNA and Ki-67 was associated with poor prognosis in ovarian neoplasms. Analysis of cell proliferation in model tumors showed that the transplant model has a better sensitivity when compared to the animal skin model and the subcutaneous injection model, in that effect of changes in cell-host interaction on the location and extent of the proliferating cell population can be studied therein. The expression of some growth factors, their receptors, oncogenes and suppressor genes were studied in ovarian and endometrial carcinomas and in skin cancer model system in mouse exposed to carcinogens and UV irradiation. Variability in expression and methodological problems precluded detailed analysis of these markers in different models. The expression of TGFβ1, TGFβ2 and TGFβ3 was determined in normal human keratinocytes, and in 7 immortalized and ras-transfected benign and malignant keratinocyte cell lines, maintained as transplants and as subcutaneous tumors in nude mice. By differential immunohistochemical localization of TGFβ isoforms, we demonstrated that each isoform may serve specific roles in tumor development and progression. The complex nature of TGFβ expression prevented detailed analysis of isozymes in different models, the results in this study, however, indicated a similar pattern in the models analyzed. Morphological methods were used to determine relationship between epithelial growth and formation and deposition of collagens in the extracellular matrix in experimental models and human tumors. The composition of the mesenchyme differed in tumors originating from different cell lines reflecting functional interaction between epithelial cells and the mesenchyme in neoplastic development. Tumor-stroma interaction was distinct in human, comparable alterations were observed in experimental models, more so in transplants, less in subcutaneous tumors, affecting tumor growth and differentiation in the different models.
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Bórtoli, Mario Eduardo de. "Efeito do entorno urbano sobre as ações do vento em edifícios." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2005. http://hdl.handle.net/10183/7844.

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Neste trabalho de pesquisa desenvolveu-se uma metodologia, através de ensaios em túnel de vento, para determinar as cargas sobre estruturas altas situadas em centros urbanos e considerando a distribuição aleatória do entorno superficial. Assim, como este estudo trata do problema da determinação de cargas de estruturas situadas em centros urbanos, produziu-se, em primeiro lugar, o campo de velocidades de fundo, caracterizado por um terreno suburbano e definido pelo Código Brasileiro NBR/6123, Terreno Categoria IV. Posteriormente, nas cercanias do modelo em estudo, adicionou-se o entorno superficial. Para contemplar as variações das cargas provocadas pelo vento no entorno rugoso, as estruturas que o conformam dimensionaram-se através da Técnica Monte Carlo. Apresenta-se um método para reproduzir o entorno superficial em zonas centrais de grandes cidades, considerando a natureza aleatória das dimensões e a separação das construções, permitindo simular campos ou processos aleatórios, neste caso o entorno, definido como um campo aleatório tridimensional, em termos da densidade de probabilidade e da densidade espectral das construções. Analisou-se a estrutura da camada limite urbana na região inferior, por meio das medições em diferentes alturas das velocidades medias e flutuantes, intensidade de turbulência, macroescala integral e escala temporal da turbulência e espectros da componente de velocidade flutuante longitudinal. A bibliografia indica que para verificar a presença da subcamada rugosa, em camada limite sobre superfície rugosa, é suficiente comprovar que as tensões de Reynolds aumentam com a altura de medição. Neste trabalho, sem haver realizado medições de Tensões de Reynolds, foi possível reconhecer a presença da subcamada rugosa através de medições e comparações em diferentes alturas de velocidades médias e valores estatísticos da componente flutuante longitudinal do escoamento médio. Verificou-se que o campo de velocidade em centro urbano é nitidamente tridimensional e que a direção do vento de fundo influi no campo de velocidade. Ademais, sugeriu-se um espectro de potência para análise dinâmica de edifícios altos expostos à ação do vento em ambientes urbanos, assim como recomendações referidas à variação de velocidade e intensidade de turbulência da componente longitudinal da turbulência. Para analisar a confiabilidade das cargas de vento sugeridas nos códigos de vento Argentino e Brasilero estudaram-se as cargas sobre dois modelos de diferentes alturas, medidas em condição de modelo isolado e situado em seis situações de entornos rugosos diferentes. As cargas medidas foram momentos de flexão na base longitudinal e transversal ao escoamento médio e momento de torção. Com os resultados obtidos, pode-se avaliar as diferenças com respeito às cargas sugeridas pelos códigos NBR 6123 e CIRSOC 102 e as variações provocadas ao modificar as rugosidades superficiais.
In this research work a methodology to determine loads on tall structures located in urban centres is proposed. The proposal is based in wind tunnel tests and considers a random distribution of the surface environment. As this study deals with the determination of wind loads on structures located in urban centres, firstly the background wind velocity field, characterized by a suburban terrain, which is defined by the Brazilian code of practice NBR/6123 as a terrain of Category IV, had to be reproduced. Thereafter, the near environment of the model under study was added. In order to take into account the variations of loads caused by the random environment, the structures that shape it were dimensioned using the Monte Carlo technique. A procedure to reproduce the surface neighbouring in central areas of large cities considering the random nature of both size and distribution of buildings is presented. This procedure allows simulating either random fields or processes, in this case the neighbouring, which is defined as a three-dimensional random field, in terms of both its probability density and its spectral density. The structure of the lower part of the urban boundary layer was studied by means of measurements at different heights of both fluctuating and mean velocities, turbulence intensity, integral macroscale and time scale of turbulence, and spectra of the longitudinal fluctuating velocity component. It is widely accepted in the literature that verifying that the Reynold stresses increases with height is sufficient to prove the existence of the rough sublayer in a boundary layer over rough surface. As in this work Reynolds stresses were not measured, it was possible to distinguish the presence of a roughness surface through measurements and comparisons of mean velocities and statistical values of the longitudinal fluctuating component of the mean flow at different heights. It was verified that the velocity field in an urban centre is clearly three-dimensional and that the direction of the background wind has influence on the velocity field. Furthermore, a power spectrum for the dynamic analysis of tall buildings exposed to wind in urban environments is suggested as well as guidelines regarding the variation of both the velocity and turbulence intensity of the longitudinal component of the turbulence. Loads over two models were studied in order to analyse the reliability of the loads suggested by codes of Argentina e Brasilero. The models had different heights and loads were measured with the models isolated and in six situations of different rough urban environments. The loads that were measured were longitudinal-to-the-mean-flow and transversal-to-themean- flow bending and torsion moments. With these results it was possible to assess the differences with regard to loads suggested by the code NBR 6123 and CIRSOC 102 and the variations appearing when changing the surface roughness.
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Arnqvist, Per. "Functional clustering methods and marital fertility modelling." Doctoral thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-130734.

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This thesis consists of two parts.The first part considers further development of a model used for marital fertility, the Coale-Trussell's fertility model, which is based on age-specific fertility rates. A new model is suggested using individual fertility data and a waiting time after pregnancies. The model is named the waiting model and can be understood as an alternating renewal process with age-specific intensities. Due to the complicated form of the waiting model and the way data is presented, as given in the United Nation Demographic Year Book 1965, a normal approximation is suggested together with a normal approximation of the mean and variance of the number of births per summarized interval. A further refinement of the model was then introduced to allow for left truncated and censored individual data, summarized as table data. The waiting model suggested gives better understanding of marital fertility and by a simulation study it is shown that the waiting model outperforms the Coale-Trussell model when it comes to estimating the fertility intensity and to predict the mean and variance of the number of births for a population. The second part of the thesis focus on developing functional clustering methods.The methods are motivated by and applied to varved (annually laminated) sediment data from lake Kassj\"on in northern Sweden. The rich but complex information (with respect to climate) in the varves, including the shapes of the seasonal patterns, the varying varve thickness, and the non-linear sediment accumulation rates makes it non-trivial to cluster the varves. Functional representations, smoothing and alignment are functional data tools used to make the seasonal patterns comparable.Functional clustering is used to group the seasonal patterns into different types, which can be associated with different weather conditions. A new non-parametric functional clustering method is suggested, the Bagging Voronoi K-mediod Alignment algorithm, (BVKMA), which simultaneously clusters and aligns spatially dependent curves. BVKMA is used on the varved lake sediment, to infer on climate, defined as frequencies of different weather types, over longer time periods. Furthermore, a functional model-based clustering method is proposed that clusters subjects for which both functional data and covariates are observed, allowing different covariance structures in the different clusters. The model extends a model-based functional clustering method proposed by James and Suger (2003). An EM algorithm is derived to estimate the parameters of the model.
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Lim, Sungtaek. "The improvement of meter performance of EM sensing flowmeters using software modelling." Thesis, Cranfield University, 2008. http://hdl.handle.net/1826/3751.

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This thesis is focused on the improvement of the meter performance and power consumption of non-mechanical flowmeters such as the conventional electromagnetic flowmeter and the fluidic oscillator. Each flowmeter is studied using Finite Element Modelling for the magnetic field, the virtual current and the fluid dynamics in order to simulate flow signal. The meter design of the conventional electromagnetic flowmeter is modified to provide a better signal level by optimising the geometry of the flow channel and the magnetic field. The signal level increase can be used to reduce power consumption. This improvement provides a 1.96 times greater signal or 51% less power consumption for the conventional electromagnetic flowmeter. An alternative coil-less electromagnetic flowmeter is proposed to reduce the energy consumption. A laminated magnetostrictive material/PZT piezoelectric material is used to control the magnetic field from a permanent magnet. Modelling is carried out to optimise the meter and the magnetic field control device. The device can provide a further reduction of 54.7% of energy usage over the improved conventional electromagnetic flowmeter. The modelling of the fluidic oscillator is undertaken not only with the fluidic dynamics but also the flow signal by using the electromagnetic sensing technique. Using these approaches, recommendations for a better signal level are proposed.
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Wadge, Edmund. "The use of EM-based neural network schemes for modelling and classification." Thesis, University of Westminster, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434417.

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SOUZA, Naiara Meireles de. "Modelo multicritério para política de inspeção em pavimentos utilizando Delay Time Modelling." Universidade Federal de Pernambuco, 2017. https://repositorio.ufpe.br/handle/123456789/25051.

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O estado de conservação de pavimentos asfálticos pode interferir diretamente no desgaste de veículos e aviões, bem como na segurança de seus usuários. A principal função requerida pelas aeronaves sobre pavimentos asfálticos de aeródromos relaciona-se ao processo de pousos e decolagens. Assim, para que operações de complexos aeroportuários sejam exercidas de maneira adequada é demandado infraestrutura que considere especialmente a movimentação das aeronaves. Por isso, os revestimentos asfálticos são considerados um dos principais componentes estruturais de aeroportos juntamente com suas instalações e equipamentos. Desse modo, a conservação dos pavimentos asfálticos gera um impacto direto na disponibilidade e custo de operações. Assim, a manutenção de pavimentos apresenta-se como um problema não somente do modal rodoviário, mas também do modal aéreo, uma vez que a deterioração de pavimentos, seja por fatores climáticos ou operacionais, apresenta-se como um dos fatores mais recorrentes de incidentes em solo envolvendo aviões. Atrelado a esse contexto, essa pesquisa sugere um modelo multicritério envolvendo uma política de inspeção em pavimentos utilizando o Delay Time Modelling com o intuito de determinar o período ótimo de inspeções e manutenção preventiva em um aeroporto brasileiro localizado na região Nordeste, visando o critério de custo e disponibilidade das operações do aeródromo. Os pavimentos asfálticos estão sujeitos a uma série de defeitos e falhas, sobretudo buracos advindos da propagação das trincas. Desse modo, os buracos foram considerados o objeto de estudo por serem os que mais despendem de tratativas de manutenção em pavimentos. O modelo proposto objetivou sugerir o intervalo ideal de inspeção e de ações preventivas de manutenção com foco no custo e na disponibilidade por meio de coleta de dados objetivos e subjetivos de acordo com o conhecimento a priori de especialista. Além disso, através da aplicação da Teoria da Utilidade Multiatributo foi possível encontrar a maior função utilidade e determinar o intervalo ideal de inspeção de modo que o critério custo e disponibilidade pudessem ser desempenhados ao mesmo tempo.
The asphalt pavements conservation status can directly interfere the utilization of vehicles and aircrafts and consequently in the safety of its users. The main function required by an aircraft on asphalt pavements of aerodromes is related to the landings and take-offs processes. Therefore, for the airport complexes’ operations to be properly carried, it is required an infrastructure that especially considers the movement of the aircrafts. For that reason, asphalt coatings are considered one of the main structural components of the airports, along with its facilities and equipments the good conservation of asphalt pavements generates a direct impact on the availability and cost of the airports operations. Thus, the maintenance of pavement is not only a road transport problem but also to the air transport, since the deterioration of pavements, either by weather or operational factors, is one of the recurring factors responsible for incidents involving aircrafts on the ground. Related to this context, this research suggests a multi-criteria model involving a pavement inspection policy, using the Delay Time Modeling, in order to establish the optimal period of inspections and preventive maintenance in a Brazilian airport located in the Northeast area, aiming the cost and availability of aerodrome operations criteria. The asphalt pavements are the main cause to a set of defects and failures, particularly the holes arising from the propagation of cracks on its structure. As a consequence, the holes were considered the object of this study because they are the ones that most demand maintenance interventions. The proposed model aimed to suggest the optimal intervals for both inspection and preventive maintenance actions focusing on cost and availability through the collection of objective and subjective data according to a priori expert knowledge. Moreover, by applying the Multiattribute Utility Theory it was found the greater utility function and determined the optimal inspection interval, so that the cost and availability criteria could be simultaneously performed.
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Aparecido, Lucas Eduardo de Oliveira. "Modelos agrometeorológicos para previsão de pragas e doenças em Coffea arabica L. em Minas Gerais /." Jaboticabal, 2019. http://hdl.handle.net/11449/190699.

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Orientador: Glauco de Souza Rolim
Resumo: O café é a bebida mais consumida no mundo e uma das principais causas para a redução da produtividade e qualidade são os problemas fitossanitários. A estratégia mais comum de controle dessas doenças e pragas é a aplicação de fungicidas e inseticidas foliares, dependendo da intensidade dos mesmos na região. Esse método tradicional pode ser melhorado utilizando de sistemas de alertas por meio de modelos de estimativas dos índices de doenças e pragas. Este trabalho tem como OBJETIVOS: A) Calibrar as variáveis meteorológicas: temperatura do ar e precipitação pluviométrica do sistema ECMWF em relação aos dados de reais de superfície mensurados pelo sistema nacional de meteorologia (INMET) para o estado de Minas Gerais; B) Avaliar quais os elementos meteorológicos exercem maior influência nas principais pragas (broca e bicho-mineiro) e doenças (ferrugem e cercosporiose) do cafeeiro arábica nas principais localidades cafeeiras do Sul de Minas Gerais e do Cerrado Mineiro; C) Desenvolver modelos agrometeorológicos para previsão de pragas e doenças em função das variáveis meteorológicas usando algoritmos de machine learning e procurando uma antecipação temporal suficiente para tomada de decisões. MATERIAL E MÉTODOS: Para o objetivo “A” foram utilizados dados climáticos mensais de temperatura do ar (T, ºC) e precipitação pluviométrica (P, mm) provenientes do ECMWF e do INMET no período de 1979 a 2017. A evapotranspiração potencial foi estimada por Thornthwaite (1948) e balanço hídrico p... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Coffee is the most consumed beverage in the world, but phytosanitary problems are amongst the main causes of reduced productivity and quality. The application of foliar fungicides and insecticides is the most common strategy for controlling these diseases and pests, depending on their intensity in a region. This traditional method can be improved by using alert systems with models of disease and pest indices. This work has as OBJECTIVES: A) To calibrate the meteorological variables: air temperature and rainfall of the European Center for Medium Range Weather Forecast (ECMWF) in relation to the real surface data measured by the national meteorological system (INMET) for the state of Minas Gerais; B) To evaluate which meteorological elements, and at what time, have a greater influence on the main pests (coffee borer and coffee miner) and diseases (coffee rust and cercosporiosis) of Coffee arabica in the main coffee regions of the South of Minas Gerais and Cerrado Mineiro; C) To develop agrometeorological models for pest and disease prediction in function of the meteorological variables of the South of Minas Gerais and Cerrado Mineiro using algorithms of machine learning with sufficient temporal anticipation for decision making. MATERIAL AND METHODS: To achieve goal "A" we used monthly climatic data (T, ºC) and rainfall (P, mm) from the ECMWF and INMET from 1979 to 2015. Potential evapotranspiration was estimated by Thornthwaite (1948) and water balance by Thornthwaite and Mathe... (Complete abstract click electronic access below)
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Li, Shikun. "Network Exceptions Modelling Using Hidden Markov Model : A Case Study of Ericsson’s DroppedCall Data." Thesis, Uppsala universitet, Statistiska institutionen, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-251382.

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In telecommunication, the series of mobile network exceptions is a processwhich exhibits surges and bursts. The bursty part is usually caused by systemmalfunction. Additionally, the mobile network exceptions are often timedependent. A model that successfully captures these aspects will make troubleshootingmuch easier for system engineers. The Hidden Markov Model(HMM) is a good candidate as it provides a mechanism to capture both thetime dependency and the random occurrence of bursts. This thesis focuses onan application of the HMM to mobile network exceptions, with a case study ofEricsson’s Dropped Call data. For estimation purposes, two methods of maximumlikelihood estimation for HMM, namely, EM algorithm and stochasticEM algorithm, are used.
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Kruger, Neil. "Modelling the EM properties of dipole reflections with application to uniform chaff clouds." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2317.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.
ENGLISH ABSTRACT: The origin of chaff dates as far back as WWII, acting as a passive EM countermeasure it was used to confuse enemy radar systems and is still in use today. The purpose of this study is, firstly, to build up a knowledge base for determining chaff parameters and secondly, to calculate the theoretical Radar Cross Section (RCS) of a chaff cloud. Initially dipole resonant properties are investigated relative to dipole physical dimensions. This is extended to the wideband spatial average RCS of a dipole with application to chaff clouds. A model is developed for calculating the theoretical RCS of a cloud typically produced by a single, multiband chaff cartridge. This model is developed on the principles of sparse clouds with negligible coupling; the dipole density for which the model is valid is determined through the statistical simulation of chaff clouds. To determine the effectiveness of chaff clouds, the E-field behaviour through a chaff cloud is investigated numerically. From simulation results a model is developed for estimating the position and drop in E-field strength. It is concluded that though it would be possible to hide a target behind a chaff cloud given ideal circumstances, it is not practical in reality. Given the presented results, recommendations are made for future work.
AFRIKAANSE OPSOMMING: Die oorsprong van kaf dateer so ver terug as WOII. Dit was gebruik as ‘n passiewe EM teenmaatreël teen vyandelike radar stelsels en is steeds vandag in gebruik. Die doel van hierdie studie is eerstens, om ‘n kennisbasis op te bou vir die bepaling van kaf parameters en tweedens, om die teoretiese RDS van kafwolke te bereken. Aanvanklik word die dipool resonante eienskappe ondersoek relatief tot die dipool dimensies. Die studie word uitgebrei tot die wyeband ruimte gemiddelde RDS van ‘n dipool met toepassing op kafwolke. ‘n Model word ontwikkel om die teoretiese RDS te bereken vir ‘n tipiese kafwolk geproduseer deur ‘n enkele, multi-band kafpakkie. Die model is gegrond op die beginsels van lae digte kafwolke met weglaatbare koppeling; die dipool digtheid waarvoor die model geldig is, is bepaal deur statistiese simulasie van kafwolke. Om die effektiwiteit van kafwolke te bepaal, word die E-veld gedrag deur kafwolke numeries ondersoek. Vanaf simulasie resultate word ‘n model ontwikkel om die ligging van, en daling in E-veld sterkte af te skat. Daar word tot die gevolgtrekking gekom dat, alhoewel dit moontlik is om ‘n teiken agter ‘n kafwolk te versteek in ideale omstandighede, dit nie prakties is nie. Na aanleiding van die resultate verkry, is aanbevelings vir verdere werk gedoen.
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Pereira, Gonçalo André Nunes. "Modelling sovereign debt with Lévy Processes." Master's thesis, Instituto Superior de Economia e Gestão, 2014. http://hdl.handle.net/10400.5/7611.

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Mestrado em Ciências Actuariais
Propomos modelizar o risco de crédito soberano de cinco países da zona Euro (Portugal, Irlanda, Itália, Grécia e Espanha) seguindo uma abordagem estrutural de primeira passagem em que o movimento Browniano geométrico é substituído por um processo de Lévy regido apenas por uma componente de saltos. Deste modo, introduzimos incrementos assimétricos e leptocúrticos e a possibilidade de incumprimento instantâneo, removendo assim algumas das principais limitações do modelo Black-Scholes. Calculamos a probabilidade de sobrevivência como preço de uma opção barreira discreta, utilizando um método de valorização de opções baseado na aproximação da densidade de transição como expansão em série de Fourier de cossenos. Assumindo uma taxa de recuperação determinística, calibramos o modelo de Lévy Carr-Geman-Madan-Yor (CGMY) utilizando spreads de Credit Default Swaps semanais e obtemos a estrutura temporal de probabilidades de incumprimento. Tiramos ainda partido da representação do processo Variance Gamma (uma instância do modelo CGMY) como movimento Browniano modificado temporalmente para considerar uma estrutura de dependência entre os riscos de crédito soberanos através de uma modificação temporal comum. Em seguida, ilustramos um possível procedimento de calibração multidimensional e obtemos a distribuição de sobrevivência conjunta via simulação.
We propose to model the sovereign credit risk of five Euro area countries (Portugal, Ireland, Italy, Greece and Spain) under a first passage structural approach, replacing the classical geometric Brownian motion dynamics with a pure jump Lévy process. This framework caters for skewness, fat tails and instantaneous defaults, thus addressing some of the main drawbacks of the Black-Scholes model. We compute the survival probability as the price of a discrete barrier option, using an option pricing method based on the approximation of the transition density as a Fourier-cosine series expansion. Assuming a deterministic recovery rate, we calibrate the Carr-Geman-Madan-Yor (CGMY) Lévy model to weekly Credit Default Swaps data and obtain the default probability term structure. By drawing on the representation of the Variance Gamma process (a particular instance of the CGMY model) as a time-changed Brownian motion, we accommodate dependency between sovereigns via a common time change. We then illustrate a possible multivariate calibration procedure and simulate the joint default distribution.
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Books on the topic "Em modelling"

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Martins, João Poças, António Aguiar Costa, and Luís Sanhudo, eds. 3º Congresso Português de ‘Building Information Modelling’ (ptBIM 2020). FEUP, 2020. http://dx.doi.org/10.24840/978-972-752-272-9.

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A crescente importância da representação digital de elementos de construção, tornada possível pelas metodologias ‘Building Information Modelling’ (BIM), está a introduzir alterações muito relevantes no projeto, na construção e gestão de operações. Estes processos digitais introduzem novos paradigmas de relacionamento entre os vários ‘atores’ envolvidos, com grande impacto nas formas de desenvolver o trabalho. O objetivo do Congresso PTBIM é o de promover um fórum de discussão técnico-científica em língua Portuguesa, envolvendo a participação ativa das comunidades profissional e académica das áreas de Arquitetura e Engenharia. Pretende-se enfatizar os problemas e esforços de implementação na Indústria da Construção e reforçar as redes de profissionais que incorporam práticas BIM nas suas atividades. Depois do sucesso do 1º e 2º Congresso PTBIM, decorridos, respetivamente, em Guimarães e Lisboa, é com grande expectativa que se organiza esta 3ª edição. O desafio é continuarmos a partilhar experiências, boas práticas e conhecimento, rumo a uma implementação mais consistente da metodologia BIM na indústria da construção.
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Book chapters on the topic "Em modelling"

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Munk, Axel, and Mihaela Pricop. "On the self-regularization property of the EM algorithm for Poisson inverse problems." In Statistical Modelling and Regression Structures, 431–48. Heidelberg: Physica-Verlag HD, 2009. http://dx.doi.org/10.1007/978-3-7908-2413-1_23.

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Buchholz, Peter. "An EM-Algorithm for MAP Fitting from Real Traffic Data." In Computer Performance Evaluation. Modelling Techniques and Tools, 218–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45232-4_14.

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Bražėnas, Mindaugas, Gábor Horváth, and Miklós Telek. "Efficient Implementations of the EM-Algorithm for Transient Markovian Arrival Processes." In Analytical and Stochastic Modelling Techniques and Applications, 107–22. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43904-4_8.

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Hailemariam, Henok, and Frank Wuttke. "Modelling EM Heating of Porous Media with Lattice Element Method." In Springer Series in Geomechanics and Geoengineering, 315–22. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99670-7_40.

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Luan, Fangjun, Shuai Wang, Zhonghua Han, and Hongbin Cui. "EM Algorithm-Based Combined Distribution of Mold on the Mold Table." In Proceedings of the 11th International Conference on Modelling, Identification and Control (ICMIC2019), 1281–90. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0474-7_120.

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Svensén, Markus, Frithjof Kruggel, and D. Yves von Cramon. "Markov Random Field Modelling of fMRI Data Using a Mean Field EM-algorithm4." In Lecture Notes in Computer Science, 317–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48432-9_22.

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Erlwein-Sayer, Christina, and Peter Ruckdeschel. "Robustification of an On-line EM Algorithm for Modelling Asset Prices Within an HMM." In Hidden Markov Models in Finance, 1–31. Boston, MA: Springer US, 2014. http://dx.doi.org/10.1007/978-1-4899-7442-6_1.

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de Oliveira, Rodrigo M. S., Reinaldo C., Ricardo H. Chamie Filho, Yuri C., and Carlos Leonidas S.S. Sobrinho. "Applications of the Parallel-LN-FDTD Method to Calculating Transient EM Field in Complex Power Systems." In Modelling, Simulation and Identification. Sciyo, 2010. http://dx.doi.org/10.5772/10014.

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McKenzie, Patricia, and Michael Alder. "Initializing the EM algorithm for use in Gaussian mixture modelling." In Pattern Recognition in Practice IV - Multiple Paradigms, Comparative Studies and Hybrid Systems, 91–105. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-444-81892-8.50013-4.

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Ajaefobi, Joseph, Aysin Rahimifard, and Richard Weston. "Enterprise Modelling in Support of Organisation Design and Change." In Enterprise Information Systems, 370–96. IGI Global, 2011. http://dx.doi.org/10.4018/978-1-61692-852-0.ch205.

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Enterprises (business organisations) are increasingly operating under uncertain conditions arising from: governments that introduce new regulations; a market place which is shaped by ongoing change in customer requirements; change in capital markets that orient overall market directions; an advancing base of technology; and increasing competition which can arise from a growing number of sources (Monfared, 2000). Consequently, organisations are expected to change rapidly in response to emerging requirements. Classical theories and more recently ‘method-based’ organisation (re)design and change approaches have been proposed and tried with varying degrees of successes. This chapter contribution discusses the role of enterprise and simulation modelling in support of organisation (re)design and change. The capabilities and constraints of some widely acknowledged public domain enterprise modelling frameworks and methods are reviewed. A modelling approach which integrates the use of enterprise modelling (EM), causal loop modelling (CLM), and simulation modelling (SM) is described. The approach enables the generation of coherent and semantically rich models of organisations. The integrated modelling approach has been applied and tested in a number of manufacturing enterprises (MEs) and one case study application is described.
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Conference papers on the topic "Em modelling"

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Murakami, Ikuya, and Naoyuki Aikawa. "A Design Method for Hilbert Transformers using an L1 Error Criterion." In Modelling and Simulation. Calgary,AB,Canada: ACTAPRESS, 2013. http://dx.doi.org/10.2316/p.2013.804-031.

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Esfahani, S. H., and A. Kh Sichani. "An Improvement on Fuzzy H∞-Tracking Control Design for Nonlinear Time-Delay Systems." In Modelling and Simulation. Calgary,AB,Canada: ACTAPRESS, 2010. http://dx.doi.org/10.2316/p.2010.697-070.

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Esfahani, S. H., and A. Kh Sichani. "An Improvement on the Problem of Fuzzy H∞-Tracking Control Design for Nonlinear Systems." In Modelling and Simulation. Calgary,AB,Canada: ACTAPRESS, 2010. http://dx.doi.org/10.2316/p.2010.697-069.

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Matsumoto, Mitsuharu. "Noise Robust Human Detection Combining Self-Quotient ε-Filter and HOG Feature Distance Criterion." In Applied Simulation and Modelling. Calgary,AB,Canada: ACTAPRESS, 2012. http://dx.doi.org/10.2316/p.2012.777-004.

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Karimi, H. R. "Delay-Dependent H∞ Filter Design for Linear Time-Delayed Systems with Nonlinear Perturbations." In Modelling, Identification, and Control. Calgary,AB,Canada: ACTAPRESS, 2010. http://dx.doi.org/10.2316/p.2010.675-067.

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Lino, José, Gustavo Ferreiro, Antonio Tort, and Daniel Félix. "International Master BIM Manager em Língua Portuguesa – Experiência Colaborativa em Ensino à Distância." In 3º Congresso Português de 'Building Information Modelling'. Porto: FEUP, 2020. http://dx.doi.org/10.24840/978-972-752-272-9_0243-0253.

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Ley-Cooper, Alan Yusen, Tim Munday, Andrea Viezzoli, Julien Guillemoteau, James Macnae, and Leif Cox. "Oversolicitous Attention on Airborne EM Modelling." In Near Surface Geophysics Asia Pacific Conference, Beijing, China 17-19 July 2013. Society of Exploration Geophysicists, Australian Society of Exploration Geophysicists, Chinese Geophysical Society, Korean Society of Earth and Exploration Geophysicists, and Society of Exploration Geophysicists of Japan, 2013. http://dx.doi.org/10.1190/nsgapc2013-091.

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Ferreira, José, Miguel Azenha, and Nuno Mendes. "Ensaios Virtuais à Rotura em Estruturas de Betão Armado com Base em Modelos BIM." In 3º Congresso Português de 'Building Information Modelling'. Porto: FEUP, 2020. http://dx.doi.org/10.24840/978-972-752-272-9_0443-0453.

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Guang-cheng Li, Li-xin Guo, and Yu Liang. "Simulation modelling the GPS signal propagation in the tropospheric ducts." In EM Theory (ISAPE - 2010). IEEE, 2010. http://dx.doi.org/10.1109/isape.2010.5696535.

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Gomes, Joana, and Sara Eloy. "Do Laser Scan à Experiência em Realidade Virtual Imersiva em Modelos BIM: Experiências e Testemunhos." In 3º Congresso Português de 'Building Information Modelling'. Porto: FEUP, 2020. http://dx.doi.org/10.24840/978-972-752-272-9_0717-0727.

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