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Barcelona, Spain

Cabral V.M.,ICE | Barros L.C.,University of Campinas
2012 Annual Meeting of the North American Fuzzy Information Processing Society, NAFIPS 2012 | Year: 2012

We study the SI epidemiological model in two distinct ways, one considering correlation between the numbers of susceptible and infected individuals, and another assuming that the initial conditions and the transmission rate are interactive. In both cases we assume uncertainties given by fuzzy sets. Interactivity is based on the concept of completely correlated fuzzy numbers. The dynamics of each model is represented by fuzzy differential equations (FDE) approached in two ways: the first using the theory of fuzzy differential inclusion and the second using Zadeh's extension principle to obtain a solution. We found that both produce the same solution. © 2012 IEEE. Source


Lei S.,Postgraduate Team 2 | Huali W.,ICE
2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011 | Year: 2011

In this paper, the narrowband DOA estimation problem is studied in compressive sensing (CS) perspective. A novel DOA estimation approach based on extended Bayesian compressive sensing (BCS) is presented. To avoid the matrix singular drawback in BCS, a basis pruning procedure through iterative hard thresholding is utilized. The proposed method is hyper-parameter free and needs not know the number of sources a prior. Simulation results demonstrate that the proposed scheme has high space resolution and can resolve highly correlated or coherent sources. © 2011 IEEE. Source


Kumar P.,ICE | Singh S.K.,Krishna Institute of Engineering and Technology | Ojha P.,Krishna Institute of Engineering and Technology
Proceedings - 2011 International Conference on Computational Intelligence and Communication Systems, CICN 2011 | Year: 2011

Analyze some of the basic principles involved in the design of optical fiber based displacement sensor and to apply it to design a weight measurement system. Bifurcated optical fiber sensors can have many applications. Having high sensitivity to short distances, bifurcated optical fiber (Y-sensor) is well suited not only for control applications as position sensors, but also for gauging and surface assessment. In addition, they can be utilized as non contact pressure sensors if used in conjunction with reflective diaphragms moving in response to pressure. Y-sensor can also be applied as temperature transducer if used in conjunction with deformable bimetal sensors. © 2011 IEEE. Source


Abreu V.G.C.,University of Sao Paulo | da Silva M.C.,University of Sao Paulo | Magalhaes R.M.,University of Sao Paulo | Pilo-Veloso D.,University of Sao Paulo | And 3 more authors.
Acta Amazonica | Year: 2010

Three coumarins, 5-methoxypsoralene, xanthyletin, and (-)-marmesin, have been isolated from the ethanolic extract of the stem of the Amazonian plant Brosimum potabile. The structures were determined on the basis of NMR analyses and by comparison with spectroscopic data in the literature. The analysis of the hexane fractions by GC-MS in EIMS mode suggested the presence of (1-methylpentyl)-benzene; α,α-dimethyl-4-(1-methylethyl)-benzenemethanol; 1-methyl-3,5-bis(1-methylethyl)- benzene; urs-12-ene; chola-5,22-dien-3β-ol; cholesta-4,6-dien-3β-ol; sitosteryl 9(Z)-octadecenoate; cholesta-5,22-dien-3β-ol; cholesta-4,6,22-trien-3-one; and cholesta-4,22-dien-3-one. NMR data of other hexane fractions indicated the presence of 3β-acetoxy-lup-12,20(29)-diene; 3β-acetoxy-olean-12-ene; 3β-acetoxy-urs-12-ene; and adian-5-ene. All these compounds are first described in B. potabile. Source


Rojas J.R.,ICE
International Journal on Hydropower and Dams | Year: 2012

Soaring international prices for oil and gas are driving the expansion of renewable energies in Central America, a region which has plenty of untapped potential for producing hydropower, wind power and geothermal energy. The seven countries in the region are taking steps to accelerate the use and diversification of the renewable energies. This has created a new climate for business, and an increase in regional investments in and between transboundary nations. Source

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