Victor De Oliveira

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Cient cas y Tecnoll ogicas (Venezuela), Grant G-97000592. The authors are grateful to Montserrat Fuentes and a referee for helpful comments that considerably improved the paper. Abstract Spatially varying phenomena are often modeled using Gaussian random elds, speciied by their mean function and covariance function. The spatial correlation structure of(More)
This work develops a Bayesian approach to perform inference and prediction in Gaus-sian random fields based on spatial censored data. These type of data occur often in the earth sciences due either to limitations of the measuring device or particular features of the sampling process used to collect the data. Inference and prediction on the underlying(More)
Emission reductions were mandated in the Clean Air Act Amendments of 1990 with the expectation of concomitant reductions in ambient concentrations of atmospherically-transported pollutants. To evaluate the effectiveness of the legislated emission reductions using monitoring data, this paper proposes a two-stage approach for the estimation of regional trends(More)
BACKGROUND In the field of anterior cruciate ligament (ACL) reconstruction, there is still no consensus regarding the proper fixation method and position of the tunnels. The primary objective of this paper was to describe a new fixation device, the Endo Tunnel Device (ETD®), for both techniques (transtibial and transportal), as well as the associated(More)
OBJECTIVES To ascertain thickness measurements on the anterior cruciate ligament (ACL) in its middle third on magnetic resonance imaging (MRI) scans and to assess whether there is any association between variations in ligament thickness and patients' heights and ages, along with variations in the anatomical measurements on the knee. METHODS MRI scans on(More)
OBJECTIVE To evaluate the medium and long term results from total knee arthroplasty with rotating tibial weight-bearing. METHODS Between January 2000 and July 2007, 162 patients underwent total knee arthroplasty with mobile tibial weight-bearing. Among these, 96 were evaluated in a previous study with a mean follow-up of 4 years. In the present study, the(More)
Methodology is proposed for the construction of prediction intervals for integrals of Gaussian random fields over bounded regions (called block averages in the geostatistical literature) based on observations at a finite set of sampling locations. Two bootstrap calibration algorithms are proposed, termed indirect and direct, aimed at improving upon plug-in(More)