178 research outputs found
A TIME-BASED APPROACH FOR SOLVING THE DYNAMIC PATH PROBLEM IN VANETS – AN EXTENSION OF ANT COLONY OPTIMIZATION
Over a decade, Vehicular Adhoc Networks (VANETS) has been evolved and the field of vehicular communication has become a promising area for potential research. The challenges vary from a vehicle to vehicle communication, an indication during the event of a collision, and to enhance the drive and passenger safety. This paper aims at improving the performance of VANETs in terms of capacity, size, topological changes and maintaining the shortest routes. A new scheme termed as Ant Queue Optimization Scheme (AQO) has been introduced by extending the traditional Ant Colony Optimization (ACO). The proposed Ant Queue optimization Scheme combines both proactive and reactive mechanisms. Unlike the ACO, the AQO dynamically makes decision in choosing shortest best route in highly congested areas. Route selection is
dynamic at each intersection irrespective of the size of the traffic. Encouraging results have been achieved in using the Ant Queue Optimization even at high vehicular density scenarios
Predicting and curing depression using long short term memory and global vector
In today’s world, there are many people suffering from mental
health problems such as depression and anxiety. If these conditions are not
identified and treated early, they can get worse quickly and have far-reaching
negative effects. Unfortunately, many people suffering from these conditions,
especially depression and hypertension, are unaware of their existence until the
conditions become chronic. Thus, this paper proposes a novel approach using
Bi-directional Long Short-Term Memory (Bi-LSTM) algorithm and Global
Vector (GloVe) algorithm for the prediction and treatment of these conditions.
Smartwatches and fitness bands can be equipped with these algorithms which
can share data with a variety of IoT devices and smart systems to better
understand and analyze the user’s condition. We compared the accuracy and
loss of the training dataset and the validation dataset of the two models
namely, Bi-LSTM without a global vector layer and with a global vector layer.
It was observed that the model of Bi-LSTM without a global vector layer had
an accuracy of 83%, while Bi-LSTM with a global vector layer had an accuracy
of 86% with a precision of 86.4%, and an F1 score of 0.861. In addition to
providing basic therapies for the treatment of identified cases, our model also
helps prevent the deterioration of associated conditions, making our method
a real-world solution
Longitudinal-Transverse Separations of Structure Functions at Low for Hydrogen and Deuterium
We report on a study of the longitudinal to transverse cross section ratio,
, at low values of and , as determined from
inclusive inelastic electron-hydrogen and electron-deuterium scattering data
from Jefferson Lab Hall C spanning the four-momentum transfer range 0.06 GeV. Even at the lowest values of , remains
nearly constant and does not disappear with decreasing , as expected. We
find a nearly identical behaviour for hydrogen and deuterium.Comment: 4 pages, 2 gigure
Charged pion form factor between =0.60 and 2.45 GeV. I. Measurements of the cross section for the H() reaction
Cross sections for the reaction H() were measured in Hall
C at Thomas Jefferson National Accelerator Facility (JLab) using the CEBAF
high-intensity, continous electron beam in order to determine the charged pion
form factor. Data were taken for central four-momentum transfers ranging from
=0.60 to 2.45 GeV at an invariant mass of the virtual photon-nucleon
system of =1.95 and 2.22 GeV. The measured cross sections were separated
into the four structure functions , , , and
. The various parts of the experimental setup and the analysis
steps are described in detail, including the calibrations and systematic
studies, which were needed to obtain high precision results. The different
types of systematic uncertainties are also discussed. The results for the
separated cross sections as a function of the Mandelstam variable at the
different values of are presented. Some global features of the data are
discussed, and the data are compared with the results of some model
calculations for the reaction H().Comment: 26 pages, 23 figure
Charged pion form factor between Q^2=0.60 and 2.45 GeV^2. II. Determination of, and results for, the pion form factor
The charged pion form factor, Fpi(Q^2), is an important quantity which can be
used to advance our knowledge of hadronic structure. However, the extraction of
Fpi from data requires a model of the 1H(e,e'pi+)n reaction, and thus is
inherently model dependent. Therefore, a detailed description of the extraction
of the charged pion form factor from electroproduction data obtained recently
at Jefferson Lab is presented, with particular focus given to the dominant
uncertainties in this procedure. Results for Fpi are presented for
Q^2=0.60-2.45 GeV^2. Above Q^2=1.5 GeV^2, the Fpi values are systematically
below the monopole parameterization that describes the low Q^2 data used to
determine the pion charge radius. The pion form factor can be calculated in a
wide variety of theoretical approaches, and the experimental results are
compared to a number of calculations. This comparison is helpful in
understanding the role of soft versus hard contributions to hadronic structure
in the intermediate Q^2 regime.Comment: 18 pages, 11 figure
Separated Response Function Ratios in Exclusive, Forward pi^{+/-} Electroproduction
The study of exclusive electroproduction on the nucleon,
including separation of the various structure functions, is of interest for a
number of reasons. The ratio is
sensitive to isoscalar contamination to the dominant isovector pion exchange
amplitude, which is the basis for the determination of the charged pion form
factor from electroproduction data. A change in the value of
from unity at small , to 1/4 at
large , would suggest a transition from coupling to a (virtual) pion to
coupling to individual quarks. Furthermore, the mentioned ratios may show an
earlier approach to pQCD than the individual cross sections. We have performed
the first complete separation of the four unpolarized electromagnetic structure
functions above the dominant resonances in forward, exclusive
electroproduction on the deuteron at central values of 0.6, 1.0, 1.6
GeV at =1.95 GeV, and GeV at =2.22 GeV. Here, we
present the and cross sections, with emphasis on and , and
compare them with theoretical calculations. Results for the separated ratio
indicate dominance of the pion-pole diagram at low , while results
for are consistent with a transition between pion knockout and quark
knockout mechanisms.Comment: 6 pages, 3 figure
Asteroseismology and Interferometry
Asteroseismology provides us with a unique opportunity to improve our
understanding of stellar structure and evolution. Recent developments,
including the first systematic studies of solar-like pulsators, have boosted
the impact of this field of research within Astrophysics and have led to a
significant increase in the size of the research community. In the present
paper we start by reviewing the basic observational and theoretical properties
of classical and solar-like pulsators and present results from some of the most
recent and outstanding studies of these stars. We centre our review on those
classes of pulsators for which interferometric studies are expected to provide
a significant input. We discuss current limitations to asteroseismic studies,
including difficulties in mode identification and in the accurate determination
of global parameters of pulsating stars, and, after a brief review of those
aspects of interferometry that are most relevant in this context, anticipate
how interferometric observations may contribute to overcome these limitations.
Moreover, we present results of recent pilot studies of pulsating stars
involving both asteroseismic and interferometric constraints and look into the
future, summarizing ongoing efforts concerning the development of future
instruments and satellite missions which are expected to have an impact in this
field of research.Comment: Version as published in The Astronomy and Astrophysics Review, Volume
14, Issue 3-4, pp. 217-36
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