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Sleeper's Attendance is a paper describing a method to be used on a University's attendance system that can essentially bypass it and allow the attacker to register for all their classes. The paper also briefly describes about QR attendance systems in general and some ways to improve it.

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Bioclimate-driven regression analysis is a widely used approach for modelling ecological niches and zonation. Although the bioclimatic complexity of the European continent is high, a particular combination of 12 climatic and topographic covariates was recently found able to reliably reproduce the ecological zoning of the Food and Agriculture Organization of the United Nations (FAO) for forest resources assessment at pan-European scale, generating the first fuzzy similarity map of FAO ecozones in Europe. The reproducible procedure followed to derive this collection of bioclimatic indices is now presented. It required an integration of data-transformation modules (D-TM) using geospatial tools such as Geographic Information System (GIS) software, and array-based mathematical implementation such as semantic array programming (SemAP). Base variables, intermediate and final covariates are described and semantically defined by providing the workflow of D-TMs and the mathematical formulation following the SemAP notation. Source layers to derive base variables were extracted by exclusively relying on global-scale public open geodata in order for the same set of bioclimatic covariates to be reproducible in any region worldwide. In particular, two freely available datasets were exploited for temperature and precipitation (WorldClim) and elevation (Global Multi-resolution Terrain Elevation Data). The working extent covers the European continent to the Urals with a resolution of 30 arc-second. The proposed set of bioclimatic covariates will be made available as open data in the European Forest Data Centre (EFDAC). The forthcoming complete set of D-TM codelets will enable the 12 covariates to be easily reproduced and expanded through free software. ....................................................................................................................... This manuscript has been accepted for publication in IEEE Earthzine 2014 Vol. 7 Issue 2, 2nd quarter theme: Geospatial Semantic Array Programming. The definitive version has been published at: http://www.earthzine.org/?p=877975 ...................................................................................................................... Please, cite the definitive version of the article as: Caudullo, G., 2014. Applying Geospatial Semantic Array Programming for a Reproducible Set of Bioclimatic Indices in Europe. IEEE Earthzine 7 (2), 877975+. URL http://www.earthzine.org/?p=877975

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En la realización de circuitos eléctricos, se puede evaluar tanto teóricamente como experimentalmente siguiendo diferentes leyes como la ley de Ohm. En la práctica presente se realizó la medición de resistencias y corrientes en diferentes tipos de circuitos, los cuales fueron un circuito con una resistencia, un circuito con resistencias en serie, uno con resistencias en paralelo y otro con resistencias mixtas (Paralelas y en serie) para poder analizar el cambio de voltaje, resistencia e intensidad de corriente en cada una de sus resistencias así como para obtener una resistencia equivalente para cada circuito.

Cada material existente poseen características que los diferencian unos de otros y que cumplen una función especifica en la naturaleza. A dichas características también se les pueden llamar propiedades. Hay propiedades que dependen de su composición atómica. Una de ellas es la resistividad. En el presente reporte se determinará la resistividad de un cable cuyo material es desconocido y con dicha resistividad se determinará el material del alambre. Se realiza esto utilizando la ley de ohm mediante la medicion de el voltaje y corriente en diferentes distancias en un alambre aislado. Mediante esto se obtendrá una resistencia y por lo tanto su resistividad.

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