Upper And Lower Bounds
Mostrando 1-12 de 30 artigos, teses e dissertações.
-
1. Structural reliability model considering mixed probabilistic and interval variables
Abstract Traditional probability-based structural reliability analysis method can only consider random uncertainties described by random distribution functions, which required sufficient experimental samples. On comparison, interval uncertainties can be more appropriate when lacking information. In realistic situations, several structural reliability models
Lat. Am. j. solids struct.. Publicado em: 17/01/2020
-
2. Upper and lower bounds for annuities and life insurance from incomplete mortality data
RESUMO O objetivo deste estudo foi estabelecer limites superior e inferior para o valor presente esperado de anuidades vitalícias e seguros de vida inteira a partir de dados incompletos sobre mortalidade, generalizando resultados anteriores sobre expectativa de vida. Desde seu surgimento, no século XVII, a ciência atuarial se dedica ao estudo de anuidades
Rev. contab. finanç.. Publicado em: 25/03/2019
-
3. An efficient hybrid heuristic method for the 0-1 exact k-item quadratic knapsack problem
The 0-1 exact k-item quadratic knapsack problem (E - kQKP) consists of maximizing a quadratic function subject to two linear constraints: the first one is the classical linear capacity constraint; the second one is an equality cardinality constraint on the number of items in the knapsack. Most instances of this NP-hard problem with more than forty variables
Pesqui. Oper.. Publicado em: 2014-04
-
4. Limitantes para Códigos de Peso Constante / Bounds for Constant-Weight Codes
O principal objetivo desta dissertação foi construir limitantes inferiores e superiores para o número de elementos de um código corretor de erros de peso constante, contido no espaço vetorial Fn 3 , onde F3 é um corpo contendo três elementos, a partir de parâmetros como comprimento e distância mínima do código. Apresentamos os principais resultado
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/01/2011
-
5. Limitantes para Códigos de Peso Constante / Bounds for Constant-Weight Codes
The main purpose of this dissertation was to construct lower and upper bounds for the cardinality of the error correcting codes for constant-weight, contained in the vector space Fn 3 , where F3 is a field with three elements, knowing parameters such as length and minimum distance code. We present the main results of linear algebra necessary to develop the t
Publicado em: 2011
-
6. Error bound for a perturbed minimization problem related with the sum of smallest eigenvalues
Let C be a n×n symmetric matrix. For each integer 1 < k < n we consider the minimization problem m(ε): = minX{ Tr{CX} + εƒ(X)}. Here the variable X is an n×n symmetric matrix, whose eigenvalues satisfy the number ε is a positive (perturbation) parameter and ƒ is a Lipchitz-continuous
Computational & Applied Mathematics. Publicado em: 2010-06
-
7. Codigos esfericos em toros planares / Spherical codes on flat torus
Spherical codes in Euclidean spaces are finite sets of points on the surface of a multidimensional sphere and have been widely studied in connection with the signal transmission over a Gaussian channel. For this purpose one fundamental issue is to maximize the minimum distance between two code points, what is strongly related to the more general problem of s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/07/2009
-
8. Geração de colunas para o problema de dimensionamento de lotes de produção com limitações de capacidade / Column generation heuristics for capacitated lotsizing problem
The Capacitated Lot Sizing Problem (CLSP) consists in determining a production plan such that all demands are met and the total costs of production, inventory and setup are minimized. Since the problem to find a feasible solution to the CLSP with setup times is NP-complete, large problem instances have been solved by heuristic methods. In this dissertation,
Publicado em: 2009
-
9. ALGORITMOS PRIMAIS E DUAIS PARA O PROBLEMA DAS P-MEDIANAS / PRIMAL AND DUAL ALGORITHMS FOR THE UNCAPACITED P-MEDIAN PROBLEM
A facility is any center that offers services to a set of clients. It may be, among others, a school, a factory or a depot. Facility location problems are combinatorial optimization problems that handle decisionmaking in respect to the positioning of those services, optimizing some defined criteria. The measures often used to assess the quality of a solution
Publicado em: 2009
-
10. Cephalometric study of skeletal, dental and soft tissue structures in white, black and afrocaucasian young Brazilian descents with normal occlusion / Estudo cefalométrico das estruturas esqueléticas, dentárias e tegumentares, em jovens brasileiros, leucodermas, feodermas e melanodermas, com "oclusão normal"
Actually, metropolitan areas have diverse populations, with a need to recognize that a standard of facial esthetics might not be appropriate when making orthodontics diagnostic and treatment plans for patients from various racial and ethnic backgrounds that migrated to distinct geographic bounds. With the purpose of using a specific cephalometric standard fo
Publicado em: 2008
-
11. Robust filtering via convex combination of Kalman filters / Filtragem robusta via combinação convexa de filtros de Kalman
In this work, a new method to H2robust ?ltrer design is proposed. A convex combination of Kalman ?lters, calculated in each vertex of the uncertainty polytope, is used to synthesize the robust ?lter. For this model, the best one is calculated through a convex programming problem, expressed in terms of LMIs. Inicially a sub-class of polytopic systems is consi
Publicado em: 2007
-
12. Extremal disturbance analysis for dynamical systems with uncertain input
The philosophy of the extremal disturbance analysis for dynamical systems with uncertain inputs is described. This analysis involves solving optimal control problems in which the time histories of the inputs (external disturbances) are regarded as the control functions and a response measure of the system serves as the performance index. The performance inde
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-12