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Search Results: 1 - 10 of 192506 matches for " Francisco de Assis;Lorena "
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Aplica??o da relaxa??o lagrangeana e do algoritmo genético construtivo na solu??o do problema probabilístico de localiza??o-aloca??o de máxima cobertura
Corrêa, Francisco de Assis;Lorena, Luiz Antonio Nogueira;
Gest?o & Produ??o , 2006, DOI: 10.1590/S0104-530X2006000200006
Abstract: the maximal covering location problem (mclp) seeks to locate facilities in order to maximize the serviced population, considering a given distance or standard service time. various extensions of this model have been proposed to enhance its applicability, e.g., probabilistic models for maximum location-allocation coverage with waiting time or queue length constraints for congested systems, taking into account one or more servers per service center. in this paper we present two procedures for solving a probabilistic model, which considers one server per center, using lagrangian relaxation and the constructive genetic algorithm. extensive tests of these approaches are presented and their results compared.
Novos limitantes lagrangeanos para o problema probabilístico de localiza??o-aloca??o de máxima cobertura utilizando grafos de cobertura
Corrêa, Francisco de Assis;Lorena, Luiz Antonio Nogueira;Ribeiro, Glaydston Mattos;
Gest?o & Produ??o , 2009, DOI: 10.1590/S0104-530X2009000200009
Abstract: the probabilistic maximal covering location-allocation problem (pmclap) aims to locate facilities maximizing the number of people served and providing a good level of service. this means that customers would not have to wait longer than the wait time established or to wait in long lines. these parameters are influenced by the number of the requests for service and service time, both probabilistic. the pmclap is np-complete and in this paper we study bounds with a lagrangean relaxation with clusters (lagclus). instead of using a conflict graph to represent a problem, in this paper another strategy for the use of lagclus using a special graph called covering graph is proposed. this approach provides interesting bounds.
Jornalismo de variedades: cartografia de uma especialidade da imprensa
Assis, Francisco de;
Intercom: Revista Brasileira de Ciências da Comunica??o , 2011, DOI: 10.1590/S1809-58442011000100006
Abstract: the article provides a historical and evolutionary overview on the references regarding variety journalism, confronting ideas and articulating stances that most resemble the market features. its main goal is to better conceptualize this journalistic practice, which has been conquering significant space in newspapers and magazines, but that still lacks theoretical marking. the methodology is based on bibliographical research. with a special attention to the brazilian scenery, the text unveils the changes shaped by the press, since the nineteenth century, that ended up on the current design of what may be considered variety journalism: a specialty that deals with arts and entertainment focusing on leisure options available to the readership.
Mercado de terras e trajetórias tecnológicas na Amaz?nia
Costa, Francisco de Assis;
Economia e Sociedade , 2012, DOI: 10.1590/S0104-06182012000200002
Abstract: the dynamics of the rural economy in the amazon has been observed through the phenomenon of deforestation and evaluated primarily by environmental risks and inequalities in distribution. the article indicates possibilities of change and, at the same time, demonstrates the obstacles to overcome. starting from the observation of the agrarian economy of the region as a totality in motion, it establishes the foundation of the development on six technological trajectories, explaining the asymmetries of capacity between them in the context of their relations with institutions. among these, special focus is led to the mediations that ensure production and land market. regarding the latter, the article indicates policy measures to constrain it.
A economia colonial do Gr?o-Pará: uma avalia??o crítica (1720-1822)
Costa, Francisco de Assis;
Economia e Sociedade , 2012, DOI: 10.1590/S0104-06182012000100008
Abstract: based on work of restoration of time series of some important economic variables that extend from 1720 to 1822, the paper aims to contribute to a vision of the amazonian colonial economy that emphasizes the global context - it means a demonstrated ability to assert itself as sub-system of the portuguese colonial empire in the context of world market. in discussing this capacity, the article evaluates the evolution of fundamental conditions of efficiency of the colony, considering them as determined by the peculiar features that assumed the local operation of the colonial project in gr?o-pará. these conditions, strongly characterized by the uniqueness of the natural foundations of the amazonian biome, are evaluated in reference to the institutional changes that mark in time the trajectory of the regional economy and society.
Lugar e significado da gest?o pombalina na economia colonial do Gr?o-Pará
Costa, Francisco de Assis;
Nova Economia , 2010, DOI: 10.1590/S0103-63512010000100005
Abstract: the historiography on the colonial period in the amazon involves an opposition between reality shaped by a colonial agricultural project and the occurrence of concrete situations of extractive economies, depending on the availability of capital to be applied in the main means of production: the black slave. so, a long period of scarcity of resources would have conformed a cycle of the extractive economy in the region dominated by the "drogas do sert?o", replaced with an agricultural cycle as the very result of pombal's management. this period would be the turning point for a dynamics determined by agriculture, which improved on by world market situations, particularly those linked to the independence war in the usa, would find significant limitation only with the emergence of the new cycle centered on extractive rubber, which began around the second half of the xix century. the results discussed here do not show that pombal's period is the moment when finally the foundations of the amazon economy were established. in fact, it was a vital and creative time for a trajectory, which even though started almost ? of a century before, imposed itself marking the reforms of the period, which in turn conditioned indelibly the history of the region.
Corpora??o e economia local: uma análise usando Contas Sociais Alfa (CSα) do programa de investimentos da CVRD no Sudeste Paraense (2004 a 2010)
Costa, Francisco de Assis;
Nova Economia , 2008, DOI: 10.1590/S0103-63512008000300004
Abstract: the southeast region of the state of pará has been an extraordinarily dynamic area. the great cattle ranching projects financed by the sudam were implemented there the sixties, which confronted the old brazil nut extraction structures and the expansion of family farming both spontaneous and induced, along with major mineral projects and gold mining prospectors. as parts of the process, important structural transformations took place reinforcing the role of the urban centers and their local rural bases in the logistics of new economic sectors conditioned by the formation of the mining economy. this mining economy was a result of the presence of the vale do rio doce company (cvrd), which has operated its north-system of ferrous metals based in carajás since 1985. the article presents the results of an input-output analysis with button-up methodology that calculates the economic impacts of the investment program of cvrd from 2004 to 2010, on both the rural and urban local economy and also on the rest of para state and of brazil.
Quest?o agrária e macropolíticas para a Amaz?nia
Costa, Francisco de Assis;
Estudos Avan?ados , 2005, DOI: 10.1590/S0103-40142005000100009
Abstract: the strategic statements of the pt government that started in early 2003 reaffirm the need for the country to develop based on the expansion of the domestic market, model that, in your general lines, is guiding internal discussions and political performances of the pt since long. they place, however, two innovations of great meaning: the guarantee of a macroeconomic stability as presupposition of the development and the environmental sustainability as its attribute. the combination of those three elements produces great challenges for the federal government and thus could generate inconsistencies among the solutions thinking brazil as a whole and the peculiar conditions of the amazon subject. it urges to explain such inconsistencies and to indicate modes to overcome them.
Políticas de conten??o de desmatamento, produ??o e mercado de terras na Amaz?nia: um ensaio sobre a economia local do sudeste paraense usando contas sociais alfa (CSα)
Costa, Francisco de Assis;
Estudos Econ?micos (S?o Paulo) , 2011, DOI: 10.1590/S0101-41612011000300006
Abstract: the current discussion on avoiding carbon emission associated to agricultural use of land needs a more systemic approach, whether in regard to the economic flows properly and their interactions, whether in terms of the institutional environment that ensures them. given that avoiding deforestation schemes implicate resources input-output throughout local economies and broader economic context, it seems fundamental to discuss what are the final impacts of those flows. the basic questions are: a) how such policies, starting from the rural sectors, will affect final demand, the value of the production and the variables of value added all over the economy and b) how variations in the economy affect the forms of use of natural resources and, therefore, deforestation itself. related to institutions, the article puts special emphasis on defining the market for land, because it is the core of vital issues. the article uses an ascending model to generate input-output matrices for local economies based on primary products, where works a market for land, incorporates an algorithm of carbon balance, finds the multipliers of the economy of southeastern pará and simulates four situations of policies on avoiding deforestation. the main conclusion is that policies for avoiding deforestation will probably have a hard time if not part of macro development policy on local level.
Mercado e produ??o de terras na Amaz?nia: avalia??o referida a trajetórias tecnológicas
Costa, Francisco de Assis;
Boletim do Museu Paraense Emílio Goeldi. Ciências Humanas , 2010, DOI: 10.1590/S1981-81222010000100004
Abstract: the dynamics of the rural economy in the amazon has been observed through the phenomenon of deforestation and evaluated primarily by environmental risks and distribution inequalities associated with that. the article shows possibilities of change. at the same time, demonstrates the obstacles to overcome. starting from the observation of the agrarian economy of the region as a totality in motion, establishes the foundation of this development on six technological trajectories, explaining the asymmetries of capacity between them in context of their relations with the institutions. among these, special focus is led to the mediations which ensure the production and market for land.
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