quinta-feira, 25 de agosto de 2011

Próximos eventos no ICMC

Some problems in division rings

Palestrante: Jairo Gonçalves (IME-USP)

Quando: quinta-feira, 25 de agosto, às 14h
Onde: Sala 3-104

Resumo:  Let $D$ be a division ring with center $k$, and with multiplicative group $D^{\dagger}$. Let $^{*}$ be a $k$-involution of $D$. We discuss the existence of free groups, free symmetric and unitary pairs in $D^{\dagger}$, and $k$-free group algebras in $D$.
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A Matemática e a Matemática Aplicada nos 40 anos do ICMC

Palestrante: Luiz Augusto da Costa Ladeira (ICMC)

Quando: quinta-feira, 25 de agosto, às 16h
Onde: Auditório Bloco ICMC-6
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Reliability Analysis in Series Systems: an Empirical Comparison Between Bayesian and Classical  Estimators

Palestrante: Adriano Polpo (DEs/UFSCar)

Quando: sexta-feira, 26 de agosto, às 14h
Onde: Sala de seminários DEs/UFSCar

Resumo: Atenção: esse seminário irá ocorrer na UFSCar In Reliability Analysis, coherent systems represent a most important struture. In many situations it is found that these systems are arranged in a series configuration, meaning that the system’s failure is determined by the first component’s failure. A problem of fundamental importance is to estimate the survival function parameters for each component, since this allow to establish policies and specifications that ensure adequate balances among system’s reliability and costs. However, reliability data for series systems are usually censored, in the sense that one knowns the system failure time and the responsible component, but it is not known the survival time of the remaining (good) components. In this work, we focus on two components series systems. We discuss and compare, via numerical experiments on simulated datasets, the performances of three estimation methods: Kaplan-Meier, Classical maximum likelihood and Bayesian estimators. The results of simulation study suggest the maximum likelihood and Bayesian estimators as equivalent, and the Kaplan-Meier performing worse in most cases. Joint work with Agatha S. Rodrigues (UFSCar), Teresa Cristina M. Dias (UFSCar) and Marcelo S. Lauretto(EACH-USP). Keywords: Reliability analysis, series systems, competitive risks, censored reliability data.
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Coertion of Poisson tensors and dual realizations

Palestrante: Pedro Walmsley Frejlich (IST, Portugal e Utrecht University, Holanda)

Quando: sexta-feira, 26 de agosto, às 15h
Onde: Sala 4-001

Resumo: We briefly discuss the PDE governing Poisson structures, partial symmetries of which we exploit to devise a new method "coertion" to construct Poisson tensors on normally parallelizable submanifolds of Poisson manifolds. Time permitting, we conclude by explaining how these ideas can be coupled with extra dynamical and topological conditions to yield both rigity and flexibility results in Poisson geometry via Gromov's h-principle and an unexpected duality between twisted monotone germs of bivectors and asymptotically Poisson maps.
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Computação Forense e a Perícia Criminal de Informática

Palestrante:  Pedro Monteiro da Silva Eleutério (Polícia Federal)

Quando: segunda-feira, 29 de agosto, às 10h30
Onde: Sala 3-009