Integration of C++ digital processing libraries and VTK through Tcl/Tk dynamic loadable extensions
Abstract After years of experience in computer graphics projects, GIworks workgroup at University... more Abstract After years of experience in computer graphics projects, GIworks workgroup at University of Oviedo came to the conclusion that some multipurpose graphics tools were an absolute necessity to perform rapid development on computer graphics. Such tools should provide basic facilities and should be easily adaptable to the kind of application on development to avoid starting from scratch every time a computer graphics project begins, allowing developers to concentrate on their project specific characteristics.
A fibre optic Bragg grating sensor to measure the strain in the chest of patients is described. T... more A fibre optic Bragg grating sensor to measure the strain in the chest of patients is described. The sensor provides a new method to measure ventilatory movements and it can also determine the respiratory frequency spectrum. The apparatus uses a fixed optical filter reference scheme to reduce the overall cost and is able to detect respiratory movements with frequency components up to 10 Hz. Ventilatory signals were acquired from slow breathing, with 500 ml inspiration volume, to fast, with a reduced volume of 60 ml, respiration. The sensor described here can be used to trigger the pulse burst of electrically assisted ventilation processes or to monitor high frequency oscillatory ventilation.
This paper contains the first empirical applications of a novel methodology for comparing the cit... more This paper contains the first empirical applications of a novel methodology for comparing the citation distributions of research units working in the same homogeneous field. The paper considers a situation in which the world citation distribution in 22 scientific fields is partitioned into three geographical areas: the U.S., the European Union (EU), and the rest of the world (RW). Given a critical citation level (CCL), we suggest using two real valued indicators to describe the shape of each area's distribution: a high-and a low-impact measure defined over the set of articles with citations below or above the CCL. It is found that, when the CCL is fixed at the 80 th percentile of the world citation distribution, the U.S. performs dramatically better than the EU and the RW according to both indicators in all scientific fields. This superiority generally increases as we move from the incidence to the intensity and the citation inequality aspects of the phenomena in question. Surprisingly, changes observed when the CCL is increased from the 80 th to the 95 th percentile are of a relatively small order of magnitude. Finally, it is found that international co-authorship increases the high-impact and reduces the low-impact level in the three geographical areas.
The Hargreaves equation provides reference evapotranspiration (ET o ) estimates when only air tem... more The Hargreaves equation provides reference evapotranspiration (ET o ) estimates when only air temperature data are available, although it requires previous local calibration for acceptable performance. This equation has been evaluated under semiarid conditions in Southern Spain using data from 86 meteorological stations, comparing daily estimates against those from the FAO-56 Penman-Monteith equation, which was used as standard. Variability of results among location was clearly apparent, with MBE ranging from 0.74 to À1.13 mm d À1 and RMSE from 0.46 to 1.65 mm d À1 . Maxima under-and overestimation amounted to 24.5 and 22.5%, respectively. In general, larger under-and overestimations occurred in stations located close to the coast and at inland areas, respectively. Yearly means of windspeed (V) and daily temperature range (DT) fairly influenced the accuracy of the equation. It was more accurate for windy locations with large DT, and for locations with light wind conditions combined with low to moderate values of DT. According to the values taken by V and DT, the stations were represented by points on the DT-V coordinate plane, in which four regions were delimited. A regional calibration was carried out considering only temperature and wind conditions. Correction was not necessary for stations located within two of them; for the other two regions, new values for the empirical coefficient of the equation are suggested (0.0027 and 0.0021). After correction, average RMSE and maximum and minimum MBE decreased substantially (12, 24 and 41%, respectively), and 74 out of the 86 locations gave quite accurate www.elsevier.com/locate/agwat Agricultural Water Management 81 (2006) 257-281 * Corresponding author. Tel.: +34 957 016 055; fax: +34 957 016 043.
In this work, the output estimation under delayed and scarce measurements conditions is addressed... more In this work, the output estimation under delayed and scarce measurements conditions is addressed. The process model is used to estimate the measurements that are not available. The available measurements are used to correct the estimated measurements by means of a complete regression vector update. In order to estimate the actual process output (delay-free), a model based predictor is applied. Copyright 2004 IFAC
To determine the incidence of, and predictive factors for, aortic autograft failure during follow... more To determine the incidence of, and predictive factors for, aortic autograft failure during follow-up after the Ross procedure. Of 102 consecutive patients who underwent surgery at our centre between 1997 and 2009, we selected 83 (age 32±11 years), all of whom had been discharged without significant autograft regurgitation and for whom at least one follow-up echocardiogram was available. Autograft failure was defined as the presence of at least moderate regurgitation on echocardiography. After a median follow-up period of 4.2 years (range 0.2-10.9 years), eight patients (9.6%) developed this complication, three of whom required valve replacement. The probability of survival without autograft failure at 5 years was 90% (95% confidence interval [CI] 83%-98%). Multivariate analysis showed that undergoing surgery during the first 6 months of the learning curve (hazard ratio = 9.1; 95% CI, 1.4-59.4; P=.021) and a large pulmonary annulus size, normalized by body surface area, (hazard ratio = 1.4; 95% CI, 1.016-1.924; P=.04) were independent predictors of this complication.
A atividade prática supervisionada (ATPS) é um método de ensino-aprendizagem desenvolvido por mei... more A atividade prática supervisionada (ATPS) é um método de ensino-aprendizagem desenvolvido por meio de um conjunto de atividades programadas e supervisionadas e que tem por objetivos:
Uploads
Papers by Pedro Ignacio