Faculdade de Engenharia de Computação e Telecomunicação - FCT/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/6283

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Agora exibindo 1 - 4 de 4

Acesso aberto (Open Access)
Açaí pulp demand in the retail market of Belém, state of Pará
(Universidade Federal do Pará, 2017-03) SANTANA, Antônio Cordeiro de; SANTANA, Ádina Lima de; SANTANA, Ádamo Lima de
The aim of this work was to estimate the parameters associated to the demand for açaí pulp in the retail market of Belém. Multiple regression analysis was applied to identify the key variables that impact on product consumption and to estimate the price and income elasticities and cross demand. The econometric estimation method applied was the least squares to correct heteroscedastic variance problems. Results have shown that the demand for açaí pulp is price and income inelastic. Fish and cassava flour were confirmed as complementary products of strong influence on the decisions of consumers. Product quality, with regard to its association to Chagas disease, also revealed a strong influence on product choice for household consumption. Finally, the socio-economic benefit of açaí pulp was R$ 762.78 million per year.
Acesso aberto (Open Access)
Análise discriminante múltipla do mercado varejista de açaí em Belém do Pará
(Universidade Federal do Pará, 2014-09) SANTANA, Antônio Cordeiro de; SANTANA, Ádamo Lima de; SANTANA, Ádina Lima de; SANTOS, Marcos Antônio Souza dos; MARTINS, Cyntia Meireles
Açaí pulp is one of the main foods in the State of Pará and of higher per capita consumption in 2010. The sale of açaí in Belém is carried out by several units that operate in the retail market. The objective of this study was to identify market segments: greengrocers, micro entrepreneurs and supermarkets, from the analysis of a set of variables that define the decisions of açaí consumers. The stepwise multiple discriminant analysis was used to estimate the discriminant functions. Results show that the segment identified with greater precision was the greengrocery, with 100%, followed by supermarkets, with 96.5% of the cases accurately classified, and the segment of micro entrepreneurs, with 90.9%, had the lowest accuracy in the consumer classification. The estimated model showed a high significance in the estimation process, since the functions with the variables amount of açaí, consumer income, price of açaí, quality of açaí, price of fish and price of flour, correctly classified 95.6% of the original elements.
Acesso aberto (Open Access)
New strategies for planning and performance evaluation of wireless networks: case studies based on the cross-layer approach
(2013-06) ARAÚJO, Jasmine Priscyla Leite de; RODRIGUES, Josiane do Couto; FRAIHA, Simone da Graça de Castro; GOMES, Hermínio Simões; COSTA, João Crisóstomo Weyl Albuquerque; CAVALCANTE, Gervásio Protásio dos Santos; FRANCÊS, Carlos Renato Lisboa
The use of wireless local area networks, called WLANs, as well as the proliferation of the use of multimedia applications have grown rapidly in recent years. Some factors affect the quality of service (QoS) received by the user and interference is one of them. This work presents strategies for planning and performance evaluation through an empirical study of the QoS parameters of a voice over Internet Protocol (VoIP) application in an interference network, as well as the relevance in the design of wireless networks to determine the coverage area of an access point, taking into account several parameters such as power, jitter, packet loss, delay, and PMOS. Another strategy is based on a hybrid approach that considers measuring and Bayesian inference applied to wireless networks, taking into consideration QoS parameters. The models take into account a cross layer vision of networks, correlating aspects of the physical environment, on the signal propagation (power or distance) with aspects of VoIP applications (e.g., jitter and packet loss). Case studies were carried out for two indoor environments and two outdoor environments, one of them displaying main characteristics of the Amazon region (e.g., densely arboreous environments). This last test bed was carried out in a real system because the Government of the State of Pará has a digital inclusion program called NAVEGAPARÁ.
Acesso aberto (Open Access)
O valor econômico da extração manejada de madeira no baixo Amazonas, estado do Pará
(2012-06) SANTANA, Antônio Cordeiro de; SANTOS, Marcos Antônio Souza dos; SANTANA, Ádamo Lima de; YARED, Jorge Alberto Gazel
The objective of this study was to estimate the economic value and the trade margin of roundwood from managed areas. Besides generating a positive margin values, they are relatively higher In this chain than those generated in activities contributing to deforestation in the Amazon. Additionally, the unfolding mean rate of 37.3% was achieved (2.68 m3 of logs for each 1.0 m3 of sawn timber), which revealed a low technological level of companies. At the lower Amazon, the average economic value from the extraction and sale of standing timber in the local market was R$ 23.48/m3, with a minimum value of R$ 9.06/m3 for the species in category C4 (softwood) and a maximum of R$ 55.63/m3 for the species of category C1 (special wood). Thus, considering an extraction flow of 30 years and assuming the extraction of 25 m3/ha in management designs of forest areas from concession contracts in the state of Pará, it is generate an average economic value of R$ 587.00/ha or R$ 19.56/ha/year, which is relatively higher than the profit generated by the activities of extensive livestock (around R$ 180.00 per hectare or R$ 6.00/ha/year) and grain crops (approximately R$ 420.00 per hectare or R$ 14.00/ha/year), which are the main responsibles for deforestation in the Amazon. It also presents a higher profitability than the reforesting with Paricá, whose income is R$ 192.26/ha or R$ 7.12/ha/year. The marketing margin showed that society tends to appropriate of 14.30% of the economic value generated in the wood chain from the transition contracts.

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