4,300 research outputs found
Survey of Enhancing Security of Cloud Using Fog Computing
Nowadays Fog Computing has become a vast research area in the domain of cloud computing. Due to its ability of extending the cloud services towards the edge of the network, reduced service latency and improved Quality of Services, which provides better user experience. However, the qualities of Fog Computing emerge new security and protection challenges. The Current security and protection estimations for cloud computing cannot be straightforwardly applied to the fog computing because of its portability and heterogeneity. So these issues in fog computing arises new research challenges and opportunities. This survey features about existing security concerns for fog computing and new proposed system to tackle some of the issues in fog computing related to security and privacy, thereby enhancing the cloud security
Semiconductor-metal transition in semiconducting bilayer sheets of transition metal dichalcogenides
Using first-principles calculations we show that the band gap of bilayer
sheets of semiconducting transition metal dichalcogenides (TMDs) can be reduced
smoothly by applying vertical compressive pressure. These materials undergo a
universal reversible semiconductor to metal (S-M) transition at a critical
pressure. S-M transition is attributed to lifting the degeneracy of the bands
at fermi level caused by inter-layer interactions via charge transfer from
metal to chalcogens. The S-M transition can be reproduced even after
incorporating the band gap corrections using hybrid functionals and GW method.
The ability to tune the band gap of TMDs in a controlled fashion over a wide
range of energy, opens-up possibility for its usage in a range of applications.Comment: Accepted in Phys. Rev.
Quantum Kerr tunneling vacua on a -brane: An emergent Kerr black hole in five dimensions
We revisit a non-perturbative space-time curvature theory, underlying a two
form U(1) gauge dynamics, on a D4-brane. In particular, two different gauge
choices for a two form are explored underlying the dynamics of a geometric
torsion in a second order formalism. We obtain two non-extremal quantum Kerr
geometries in five dimensions on a pair of -brane in a type IIA
superstring theory. The quantum vacua are described by a vanishing torsion in a
gauge choice, underlying a geometric realization, on a non-BPS brane. It is
argued that the quantum Kerr vacua undergo tunneling and lead to a five
dimensional Kerr black hole in Einstein vacuum. A low energy limit in the
quantum Kerr vacua further re-assures an emergent Kerr black hole.Comment: 21 pages, 8 figure
Emergent Schwarzschild and Reissner-Nordstrom black holes in 4D: An effective curvature sourced by a B2-field on a D4-brane
We obtain a Schwarzschild and a Reissner-Nordstrom emergent black holes, by
exploring the torsion dynamics in a generalized curvature formulation,
underlying an effective D4-brane on S1. It is shown that a constant effective
metric, sourced by a background fluctuation in B2-potential, on a D3-brane
receives a dynamical quantum correction in presence of an electric charge.Comment: 7-pages, minor corrections, references added, to appear in Physical
Review
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