Cutting Problems
Mostrando 13-24 de 67 artigos, teses e dissertações.
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13. A review of three decades of research on some combinatorial optimization problems
This paper presents an overview of our research in combinatorial optimization problems. Over the last three decades, our team has been studying mostly optimization problems that arise in industrial environments through the elaboration and solution of mathematical decision models. In addition to elaborating innovative models, we have improved upon existing so
Pesqui. Oper.. Publicado em: 2013-04
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14. Problemas de corte com sobras aproveitáveis e eliminação de simetrias / Cutting stock problems with usable leftover and symmetry breaking
In this work we study two variations of the packing problem where identical rectangular items must be packed into a polyhedron. One of the variations consists in finding the largest amount of rectangular items that can fit in a polyhedron. The other one consists in finding a minimal area polyhedron of a certain type that packs a set of rectangular identical
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/09/2012
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15. Optimization of end milling parameters under minimum quantity lubrication using principal component analysis and grey relational analysis
Machining is the major reliable practice in accomplishment of metal cutting industries. The accelerated growing competition demands top superior and large quantity with low cost products. Metal working fluids have significant fragment of manufacturing cost and causes ecological impacts and health problems. This work attempts to advance a competent machining
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-09
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16. A hybrid methodology to solve the container loading problem with weight distribution and cutting problems
Transport of goods has represented an important role in economic development throughout the history and ship containerization brought great advantages. Its invention in mid-1950s brought down the cost of transport and reduced time for loading and unloading cargo. Consequently, it increased efficiency of port working and reduced handling cargo to hours instea
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/09/2011
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17. Otimização do corte de pontas de um aço livre de intersticiais laminado a quente usando tesoura do tipo guilhotina / Optimization the cut edge of a hot rolled interstitial free steel using a guillotine type shearing machine
The automotive industry\ s demand for high formability steels for use in exposed body panels motivated the development of several interstitial free (IF) steels specifications at Companhia Siderurgica Nacional. The \"IF-Ti\" steel specification belongs to the special deep drawing steels group (CSN EEP-IF), with yield strength <380 MPa, and among all grades of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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18. Transcriptional networks reconstruction: identification of genes involved on cattle response to tick Rhipicephalus (Boophilus) microplus infestation.
In tropical countries, losses caused by tick infestation in cattle lead to a great impact on animal production systems. Weight and feed conversion reduction, together with diseases transmitted by the parasite are some of the problems that lead to economic losses of billion dollars a year. In a general way, Bos taurus indicus cattle are less susceptible to in
INTERNATIONAL CONFERENCE OF THE BRAZILIAN ASSOCIATION FOR BIOINFORMATICS AND COMPUTATIONAL BIOLOGY. Publicado em: 2011
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19. Comparison of radial growth rate of the mutualistic fungus of Atta sexdens rubropilosa forel in two culture media
In vitro culture of the mutualistic fungus of leaf-cutting ants is troublesome due to its low growth rate, which leads to storage problems and contaminants accumulation. This paper aims at comparing the radial growth rate of the mutualistic fungus of Atta sexdens rubropilosa Forel in two different culture media (Pagnocca B and MEA LP). Although total MEA LP
Brazilian Journal of Microbiology. Publicado em: 2010-06
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20. Algoritmos para problemas de corte e empacotamento / Algorithms for cutting and packing problems
Several versions of Cutting and Packing problems are considered NP-hard and, if we consider that P ¿ NP, we do not have any exact polynomial algorithm for solve them. Practical applications arises for such problems and include: resources allocation for computers; cut of steel, wood, glass, aluminum, etc.; packing of objects; and, loading objects into contai
Publicado em: 2010
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21. Transição agroecológica em Rondônia : a Associação dos Produtores Alternativos de Ouro Preto do Oeste
The colonization of the agricultural frontier in the Amazonian state of Rondônia was accelerated in the years 1960s and 1970s. This movement encouraged the consolidation of the modernization of agriculture, a process observed in south and southeast of Brazil. The agriculture practiced by thousands of migrants, consisted of cutting down and burning the fores
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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22. Geração de colunas para problemas de corte em duas fases / Column generation for two starge cutting stock problems
The Compartmentalized Knapsack Problem is an extension of the classical Knapsack Problem, where the ordered items are partitioned into classes, in such way that the knapsack must be divided into compartments, each one having limited capacity. In addition, the building of a compartment has a fixed cost and involves a loss of the overall capacity. The objectiv
Publicado em: 2009
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23. Estudos de processos térmicos decorrentes da usinagem: aplicação de problemas inversos em furação / Thermal studies of cutting process. Inverse problem application in drilling
Heat generation is a common problem during any type of cutting, but particularly during a drilling due to the difficulty of conducting heat away from the cutting edge and the fact that the chips remain in contact with the tool for a relatively long time in a hole. Cutting temperatures have strongly influenced both the tool life and the metallurgical state of
Publicado em: 2009
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24. Contribution of the LU factorization update in the Simplex method / Contribuição da atualização da decomposição LU no metodo Simplex
Finding efficient solution of linear systems is fundamental in the linear programming problems and the first method to obtain success for this class of problems was the Simplex method. With the objective to develop efficient alternatives to its implementation, techniques of the simplex basis LU factorization update are developed in this thesis to improve the
Publicado em: 2009