Functional centrality in graphs

In this paper we introduce the functional centrality as a generalization of the subgraph centrality. We propose a general method for characterizing nodes in the graph according to the number of closed walks starting and ending at the node. Closed walks are appropriately weighted according to the topological features that we need to measure

Implementación del servicio de mobile-learning para la universidad Antonio Nariño

El proceso de enseñanza aprendizaje en el entorno académico universitario en los últimos años ha presenciado notables cambios, empezando por la implementación de Internet en las aulas, en conjunto con diversas herramientas de la web 2.0, dando como resultado métodos de enseñanza tales como el Blended- Learning y posteriormente el E- Learning. Como complemento a lo anterior, aparece el aprendizaje electrónico móvil o M-learning, el cual ha venido tomando fuerza conforme la tecnología de dispositivos móviles crece tanto en la implementación de recursos computacionales, como en el ancho de banda para la gestión de los mismos, sumado a la masificación en su uso dentro de la comunidad académica. Este desarrollo ha conllevado, a que actualmente la gestión de información (voz, datos y video), se haga cada vez más a través de distintos tipos de dispositivo móvil, lo que ha permitido abrir toda una amplia gama de aplicaciones tanto en el ámbito académico como corporativo, combinado con el entorno educativo virtual o E-Learning.The teaching-learning process in the university academic environment in recent years has witnessed remarkable changes, starting with the implementation of the Internet in the classroom, in conjunction with various Web 2.0 tools, resulting teaching methods such as the Blended-learning and then the E-learning. To complement this, mobile e-learning appears or M-learning, which has been gaining momentum as the technology of mobile devices is growing both in the implementation of computational resources, such as bandwidth management thereof, added to the overcrowding in use within the academic community. This development has led, at present the management of information (voice, data and video), becomes increasingly through different types of mobile device, which has opened a whole range of applications in the academic and corporate, combined with the virtual learning environment or E-Learning

Ultrarobust calibration of an optical lattice depth based on a phase shift

We report on a new method to calibrate the depth of an optical lattice. It consists in triggering the intrasite dipole mode of the cloud by a sudden phase shift. The corresponding oscillatory motion is directly related to the intraband frequencies on a large range of lattice depths. Remarkably, for a moderate displacement, a single frequency dominates this oscillation for the zeroth and first order interference pattern observed after a sufficiently long time-of-flight. The method is robust against atom-atom interactions and the exact value of the extra external confinement of the initial trapping potential.Comment: 7 pages, 6 figure