347 research outputs found
Atomicity and non-anonymity in population-like games for the energy efficiency of hybrid-power HetNets
© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In this paper, the user–base station (BS) association problem is addressed to reduce grid consumption in heterogeneous cellular networks (HetNets) powered by hybrid energy sources (grid and renewable energy). The paper proposes a novel distributed control scheme inspired by population games and designed considering both atomicity and non-anonymity – i.e., describing the individual decisions of each agent. The controller performance is considered from an energy–efficiency perspective, which requires the guarantee of appropriate qualityof-service (QoS) levels according to renewable energy availability.
The efficiency of the proposed scheme is compared with other heuristic and optimal alternatives in two simulation scenarios. Simulation results show that the proposed approach inspired by population games reduces grid consumption by 12% when compared to the traditional best-signal-level association policy.Peer ReviewedPostprint (author's final draft
Atomicity and non-anonymity in population-like games for the energy efficiency of hybrid-power HetNets
© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.In this paper, the user–base station (BS) association problem is addressed to reduce grid consumption in heterogeneous cellular networks (HetNets) powered by hybrid energy sources (grid and renewable energy). The paper proposes a novel distributed control scheme inspired by population games and designed considering both atomicity and non-anonymity – i.e., describing the individual decisions of each agent. The controller performance is considered from an energy–efficiency perspective, which requires the guarantee of appropriate qualityof-service (QoS) levels according to renewable energy availability.
The efficiency of the proposed scheme is compared with other heuristic and optimal alternatives in two simulation scenarios. Simulation results show that the proposed approach inspired by population games reduces grid consumption by 12% when compared to the traditional best-signal-level association policy.Peer ReviewedPostprint (author's final draft
Relativistic deformed mean-field calculation of binding energy differences of mirror nuclei
Binding energy differences of mirror nuclei for A=15, 17, 27, 29, 31, 33, 39
and 41 are calculated in the framework of relativistic deformed mean-field
theory. The spatial components of the vector meson fields and the photon are
fully taken into account in a self-consistent manner. The calculated binding
energy differences are systematically smaller than the experimental values and
lend support to the existency of the Okamoto--Nolen-Schiffer anomaly found
decades ago in nonrelativistic calculations. For the majority of the nuclei
studied, however, the results are such that the anomaly is significantly
smaller than the one obtained within state-of-the-art nonrelativistic
calculations.Comment: 13 pages, REVTeX, no figure
El pulpeo com etanol como alternativa para incrementar la competitividade de fábricas de papel mediante su desarrollo prospectivo integrado a industrias de la caña de azúcar
La industria de la pulpa y el papel para ondular en el contexto internacional y nacional presenta debelidades tecnológicas en su proceso que afectan negativamente al medio ambiente, esto unido a las fuertes regulaciones ambientales que se han impuesto a las industrias de processos químicos obligan a los productores a buscar soluciones para hacer sus processos ambientalmente más eficientes. El proyecto está dirigido a lograr una tecnología ambientalmente compatible y económicamente competitiva de producción de papeles para ondular, para ello se parte de los beneficios que la integración material y energética de los produtos derivados de la caña de azúcar puede lograr
Accelerated expansion of the universe driven by tachyonic matter
It is an accepted practice in cosmology to invoke a scalar field with
potential when observed evolution of the universe cannot be
reconciled with theoretical prejudices. Since one function-degree-of-freedom in
the expansion factor can be traded off for the function , it is
{\it always} possible to find a scalar field potential which will reproduce a
given evolution. I provide a recipe for determining from in
two cases:(i) Normal scalar field with Lagrangian used in quintessence/dark energy
models. (ii) A tachyonic field with Lagrangian , motivated by recent string theoretic
results. In the latter case, it is possible to have accelerated expansion of
the universe during the late phase in certain cases. This suggests a string
theory based interpretation of the current phase of the universe with tachyonic
condensate acting as effective cosmological constant.Comment: 4 pages; uses revtex
Can the clustered dark matter and the smooth dark energy arise from the same scalar field ?
Cosmological observations suggest the existence of two different kinds of
energy densities dominating at small ( Mpc) and large ( Mpc) scales. The dark matter component, which dominates at small scales,
contributes and has an equation of state while
the dark energy component, which dominates at large scales, contributes
and has an equation of state . It is
usual to postulate wimps for the first component and some form of scalar field
or cosmological constant for the second component. We explore the possibility
of a scalar field with a Lagrangian L =- V(\phi) \sqrt{1 - \del^i \phi \del_i
\phi} acting as {\it both} clustered dark matter and smoother dark energy and
having a scale dependent equation of state. This model predicts a relation
between the ratio of the energy densities of the
two dark components and expansion rate of the universe (with ) in the form . For , we get
which is consistent with observations.Comment: Revised to match the published version. Minor changes and a reference
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Derivative corrections to the Born-Infeld action through beta-function calculations in N=2 boundary superspace
We calculate the beta-functions for an open string sigma-model in the
presence of a U(1) background. Passing to N=2 boundary superspace, in which the
background is fully characterized by a scalar potential, significantly
facilitates the calculation. Performing the calculation through three loops
yields the equations of motion up to five derivatives on the fieldstrengths,
which upon integration gives the bosonic sector of the effective action for a
single D-brane in trivial bulk background fields through four derivatives and
to all orders in alpha'. Finally, the present calculation shows that demanding
ultra-violet finiteness of the non-linear sigma-model can be reformulated as
the requirement that the background is a deformed stable holomorphic U(1)
bundle.Comment: 25 pages, numerous figure
The One-loop Open Superstring Massless Five-point Amplitude with the Non-Minimal Pure Spinor Formalism
We compute the massless five-point amplitude of open superstrings using the
non-minimal pure spinor formalism and obtain a simple kinematic factor in pure
spinor superspace, which can be viewed as the natural extension of the
kinematic factor of the massless four-point amplitude. It encodes bosonic and
fermionic external states in supersymmetric form and reduces to existing
bosonic amplitudes when expanded in components, therefore proving their
equivalence. We also show how to compute the kinematic structures involving
fermionic states.Comment: 38 pages, harvmac TeX, v2: fix typo in (4.2) and add referenc
The ZEUS Forward Plug Calorimeter with Lead-Scintillator Plates and WLS Fiber Readout
A Forward Plug Calorimeter (FPC) for the ZEUS detector at HERA has been built
as a shashlik lead-scintillator calorimeter with wave length shifter fiber
readout. Before installation it was tested and calibrated using the X5 test
beam facility of the SPS accelerator at CERN. Electron, muon and pion beams in
the momentum range of 10 to 100 GeV/c were used. Results of these measurements
are presented as well as a calibration monitoring system based on a Co
source.Comment: 38 pages (Latex); 26 figures (ps
Combined constraints on modified Chaplygin gas model from cosmological observed data: Markov Chain Monte Carlo approach
We use the Markov Chain Monte Carlo method to investigate a global
constraints on the modified Chaplygin gas (MCG) model as the unification of
dark matter and dark energy from the latest observational data: the Union2
dataset of type supernovae Ia (SNIa), the observational Hubble data (OHD), the
cluster X-ray gas mass fraction, the baryon acoustic oscillation (BAO), and the
cosmic microwave background (CMB) data. In a flat universe, the constraint
results for MCG model are,
()
,
()
,
()
,
()
, and ()
.Comment: 12 pages, 1figur
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