653 research outputs found
Cross-coupled doa trackers
A new robust, low complexity algorithm for multiuser tracking is proposed, modifying the two-stage parallel architecture of the estimate-maximize (EM) algorithm. The algorithm copes with spatially colored noise, large differences in source powers, multipath, and crossing trajectories. Following a discussion on stability, the simulations demonstrate an asymptotic and tracking behavior that neither the EM nor a nonparallelized tracker can emulate.Peer ReviewedPostprint (published version
Variance and interest rate risk in unit-linked insurance policies
One of the risks derived from selling long term policies that any insurance
company has, arises from interest rates. In this paper we consider a general
class of stochastic volatility models written in forward variance form. We also
deal with stochastic interest rates to obtain the risk-free price for
unit-linked life insurance contracts, as well as providing a perfect hedging
strategy by completing the market. We conclude with a simulation experiment,
where we price unit-linked policies using Norwegian mortality rates. In
addition we compare prices for the classical Black-Scholes model against the
Heston stochastic volatility model with a Vasicek interest rate model.Comment: 21 pages, 7 figure
Model Design of Wind/PV/Fossil-Fuel Hybrid Systems
This paper presents the analysis and design of a mathematical model for a hybrid-power generation system consisting of a photovoltaic array, wind-turbines, a batterybank and a backup fossil-fuel generator. The static mathematical models of each element are validated by comparing them with field-data obtained in an experimental hybrid generation system in Pachuca, Mexico. Two different state-of-charge models were simulated and compared. The results are presented in this paper. The main purpose of this work is the development of a fuzzy-supervisory-controller for small hybrid-systems
Software Radio para antenas inteligentes en comunicaciones personales multistandard
Peer ReviewedPostprint (published version
Coronary angioplasty produces alterations in the HDL proteome of patients with coronary disease
Comunicaciones a congreso
An adaptive design of an all-zero spectral estimator
Peer ReviewedPostprint (published version
ARMA model maximum entropy power spectral estimation
Peer ReviewedPostprint (published version
Sistemas delta adaptativos con control digital en canales ruidosos
Peer ReviewedPostprint (published version
Effect of Organic Nutrition in the Nursery Growth and Nutrimental Content of Native Avocados of Ometepec, Guerrero, Mexico
In Mexico, there are several types of wild and criollo avocados that constitute a genetic heritage of this species; these avocados currently grow in an unordered manner on farmer's lands and in backyards, and they need to be studied as they are being lost because of agricultural activities and edaphoclimatic and phytosanitary factors. On the other hand, in orchards and avocado nurseries, high amounts of chemical fertilizers and pesticides are used affecting the physicochemical and microbiological properties of the soil, modifying the flora and fauna and polluting aquifers and springs that cause health problems among consumers. Therefore, it is very important to have a more friendly agriculture with the nature. The aim of this work was to evaluate under nursery conditions, the effect of organic fertilizers on 12 genotypes (rootstocks) of native avocados of Ometepec, Guerrero, Mexico, under an experimental design of random blocks, with four treatments: T1: sheep manure,T2: Bovine manure, T3: mycorrhizae and T4 (control: water) in four replicates. The variables were: plant height (PH), stem diameter (SD), number of leaves: young (NYL) and mature (NML) per plant; and the content of NO3-, K+, Ca2+ and Na+ ions obtained by petiole extraction, and the chlorophyll content measured with SPAD, in young (CYL) and mature (CML) leaves. Additionally, an analysis of variance and Tukey mean tests (P ≤ 0.01 and 0.05) and LSD (P ≤ 0.05) were done. It was found that sheep manure was superior to other treatments in PH (76.7 cm), SD (7.2 mm), NYL (6.5 leaves/plant), NML (18.4 leaves/plant), CML (40.2 SPAD) and Ca2+(1495ppm). In conclusion, the sheep manure was better than the bovine, mycorrhiza and control (water) as it affected positively the behavior of rootstocks in plant height, stem diameter and number of young and mature leaves. In addition, organic nutrition showed no significant response in the chlorophyll content of young and mature leaves. Young leaves only reached 50% of the chlorophyll content compared to mature leaves
Transformaciones lineales en estimación espectral y sus aplicaciones en hidrografía y medicina
Peer ReviewedPostprint (published version
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