This paper provides a model and an analytical study of replication as a technique to detect and correct silent errors, as well as to cope with both silent and fail-stop errors on large-scale platforms. Fail-stop errors are immediately detected, unlike silent errors for which a detection mechanism is required. To detect silent errors, many application-specific techniques are available, either ba...

This study applies computational geometric algebra based on a 4| 4 homogeneous transformation matrix and Snell’s law of geometrical optics to analyze skew rays and the errors of a light ray’s path as it passes through a cylindrical lens. The author addresses two important topics: (1) the determination of the direction of a reflected or refracted ray by Snell’s law and (2) the expression of the ...

The dispersion of longitudinal stress waves as they propagate in pressure bars distorts the shape of the pulse, and so can be a limitation to the accuracy of high strain rate tests such as the compressive split Bopkinson pressure bar (SHPB). The method of dispersion correction described in this paper is based on a bar phase characteristic which is derived entirely from measured stress pulses ge...

In this paper we describe some problems arising in practical implementation of algorithms from computational geometry. Going to robust algorithms needs to solve issues such as rounding errors and degeneracies. Most of the problems are closely related to the incompatibility between on one side algorithms designed for continuous data and on the other side the discrete nature of the data and the c...

Résumé Introduction: Le Burnout est très répandu en milieu hospitalier et sa gravité est encore plus accrue chez les jeunes médecins. L'objectif est de déterminer la prévalence du burnout parmi les médecins en formation (internes et résidents) au CHU Ibn Rochd de Casablanca et chercher les facteurs associés. Méthodes: Étude transversale descriptive menée en 20132014 auprès d'un échantillon de 3...