223 research outputs found
The Fog Makes Sense: Enabling Social Sensing Services With Limited Internet Connectivity
Social sensing services use humans as sensor carriers, sensor operators and
sensors themselves in order to provide situation-awareness to applications.
This promises to provide a multitude of benefits to the users, for example in
the management of natural disasters or in community empowerment. However,
current social sensing services depend on Internet connectivity since the
services are deployed on central Cloud platforms. In many circumstances,
Internet connectivity is constrained, for instance when a natural disaster
causes Internet outages or when people do not have Internet access due to
economical reasons. In this paper, we propose the emerging Fog Computing
infrastructure to become a key-enabler of social sensing services in situations
of constrained Internet connectivity. To this end, we develop a generic
architecture and API of Fog-enabled social sensing services. We exemplify the
usage of the proposed social sensing architecture on a number of concrete use
cases from two different scenarios.Comment: Ruben Mayer, Harshit Gupta, Enrique Saurez, and Umakishore
Ramachandran. 2017. The Fog Makes Sense: Enabling Social Sensing Services
With Limited Internet Connectivity. In Proceedings of The 2nd International
Workshop on Social Sensing, Pittsburgh, PA, USA, April 21 2017
(SocialSens'17), 6 page
PEASE G.Y., Franklin (ed.) Collaquas 1, PontificiaUniversidad Católica del Perú. FondoEditorial, Lima 1977, 487 págs.
No contiene resume
Formación de la capacidad cognitiva en México: impactos económicos y de políticas públicas
A stochastic frontier model is used to make a comparative estimate of the production of cognitive capacity and stature in the family, using data from the Mexican survey ENNVIH 2002. We find that child cognitive capacity is associated with the economic status of the family, public policy variables and descriptors of the local economy. Economic and public policy inputs intervene more efficiently for the formation of cognitive capacity that for stature. The application of public programs with the objective of promoting cognitive capacity could be effective.cognitive ability, intergenerational inequality, poverty, public policy.
Low-mass galaxy formation in cosmological AMR simulations: the effects of varying the sub-grid physics parameters
We present numerical simulations aimed at exploring the effects of varying
the sub-grid physics parameters on the evolution and the properties of the
galaxy formed in a low-mass dark matter halo (~7 times 10^10 Msun/h at redshift
z=0). The simulations are run within a cosmological setting with a nominal
resolution of 218 pc comoving and are stopped at z = 0.43. In all of our
simulations, an extended old/intermediate-age stellar halo and a more compact
younger stellar disk are formed. We found that a non negligible fraction of the
halo stars are formed in situ in a spheroidal distribution. Changes in the
sub-grid physics parameters affect significantly and in a complex way the
evolution and properties of the galaxy: (i) Lower threshold densities nsf
produce larger stellar effective radii Re, less peaked circular velocity curves
V_c(R), and greater amounts of low-density and hot gas in the disk mid-plane;
(ii) When stellar feedback is modeled by temporarily switching off radiative
cooling in the star forming regions, Re increases (by a factor of ~ 2 in our
particular model), the circular velocity curve becomes flatter, and a complex
multi-phase gaseous disk structure develops; (iii) A more efficient local
conversion of gas mass to stars, measured by a stellar particle mass
distribution biased toward larger values, increases the strength of the
feedback energy injection -driving outflows and inducing burstier SF histories;
iv) If feedback is too strong, gas loss by galactic outflows -which are easier
to produce in low-mass galaxies- interrupts SF, whose history becomes episodic.
The simulations exhibit two important shortcomings: the baryon fractions are
higher, and the specific SF rates are much smaller, than observationally
inferred values for redshifts ~ 0.4-1.Comment: Accepted by ApJ after referee's revision (abstract abridged
Dynamical trust and reputation computation model for B2C E-Commerce
Trust is one of the most important factors that influence the successful application of network service environments, such as e-commerce, wireless sensor networks, and online social networks. Computation models associated with trust and reputation have been paid special attention in both computer societies and service science in recent years. In this paper, a dynamical computation model of reputation for B2C e-commerce is proposed. Firstly, conceptions associated with trust and reputation are introduced, and the mathematical formula of trust for B2C e-commerce is given. Then a dynamical computation model of reputation is further proposed based on the conception of trust and the relationship between trust and reputation. In the proposed model, classical varying processes of reputation of B2C e-commerce are discussed. Furthermore, the iterative trust and reputation computation models are formulated via a set of difference equations based on the closed-loop feedback mechanism. Finally, a group of numerical simulation experiments are performed to illustrate the proposed model of trust and reputation. Experimental results show that the proposed model is effective in simulating the dynamical processes of trust and reputation for B2C e-commerce
Oligodendroglioma anaplásico primario de la médula espinal
El oligodendroglioma de la médula espinal es una neoplasia extremadamente rara y solo se han reportado 52 casos en la literatura. Se reporta el caso de un paciente varón de 52 años, con paraplejia y un tumor en la medula espinal a nivel de C7 a T4. El diagnóstico final fue oligodendroglioma anaplásico con deleción del cromosoma 1p
Non-Volatile Resistive Switching of Polymer Residues in 2D Material Memristors
Two-dimensional (2D) materials are popular candidates for emerging nanoscale
devices, including memristors. Resistive switching (RS) in such 2D material
memristors has been attributed to the formation and dissolution of conductive
filaments created by the diffusion of metal ions between the electrodes.
However, the area-scalable fabrication of patterned devices involves polymers
that are difficult to remove from the 2D material interfaces without damage.
Remaining polymer residues are often overlooked when interpreting the RS
characteristics of 2D material memristors. Here, we demonstrate that the
parasitic residues themselves can be the origin of RS. We emphasize the
necessity to fabricate appropriate reference structures and employ atomic-scale
material characterization techniques to properly evaluate the potential of 2D
materials as the switching layer in vertical memristors. Our
polymer-residue-based memristors exhibit RS typical for a filamentary mechanism
with metal ion migration, and their performance parameters are strikingly
similar to commonly reported 2D material memristors. This reveals that the
exclusive consideration of electrical data without a thorough verification of
material interfaces can easily lead to misinterpretations about the potential
of 2D materials for memristor applications.Comment: 30 page
Historia de la Santa A. M. Iglesia de Santiago de Compostela
Todos los volúmenes, excepto el T.I, tienen apéndices documentales.En algunos vóls. las fechas de portada no coinciden con las de cubierta: vol. VII (1904/1905), vol. VIII (1905/1906), vol. XI (1909/1911)Contiene: I. Orígenes de la iglesia compostelana.-- II-III. Los tres primeros siglos de la Iglesia Compostelana. -- IV-V. Los dos siglos de oro de la Iglesia compostelana. -- VI-VII. Los dos siglos de decadencia. -- VIII. La iglesia compostelana en el siglo XVI. -- IX. La iglesia compostelana en el siglo XVII. -- X. La iglesia compostelana en el siglo XVIII. -- XI. Vicisitudes de la iglesia compostelana desde mediados del siglo XVII
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