618 research outputs found
Accuracy Booster: Performance Boosting using Feature Map Re-calibration
Convolution Neural Networks (CNN) have been extremely successful in solving
intensive computer vision tasks. The convolutional filters used in CNNs have
played a major role in this success, by extracting useful features from the
inputs. Recently researchers have tried to boost the performance of CNNs by
re-calibrating the feature maps produced by these filters, e.g.,
Squeeze-and-Excitation Networks (SENets). These approaches have achieved better
performance by Exciting up the important channels or feature maps while
diminishing the rest. However, in the process, architectural complexity has
increased. We propose an architectural block that introduces much lower
complexity than the existing methods of CNN performance boosting while
performing significantly better than them. We carry out experiments on the
CIFAR, ImageNet and MS-COCO datasets, and show that the proposed block can
challenge the state-of-the-art results. Our method boosts the ResNet-50
architecture to perform comparably to the ResNet-152 architecture, which is a
three times deeper network, on classification. We also show experimentally that
our method is not limited to classification but also generalizes well to other
tasks such as object detection.Comment: IEEE Winter Conference on Applications of Computer Vision (WACV),
202
Anisotropic cosmological models with two fluids
In this paper, aniostropic dark energy cosmological models have been
constructed in a Bianchi-V space-time with the energy momentum tensor
consisting of two non-interacting fluids namely bulk viscous fluid and dark
energy fluid. Two different models are constructed based on the power law
cosmology and de Sitter universe. The constructed model also embedded with
different pressure gradients along different spatial directions. The variable
equation of state (EoS) parameter, skewness parameters for both the models are
obtained and analyzed. The physical properties of the models obtained with the
use of scale factors of power law and de Sitter law are also presented.Comment: 10 pages, 12 figure
Axially magnetized Dark Energy cosmological model
We investigate the behaviour of the skewness parameters for an anisotropic
universe in the framework of General Relativity. Non interacting dark energy is
considered in presence of electromagnetic field. A time varying deceleration
parameter simulated by a hybrid scale factor is considered. The dynamics of the
universe is investigated in presence and absence of magnetic field. The
equation of state parameter of dark energy evolves within the range predicted
by the observations. Magnetic field is observed to have a substantial effect on
the cosmic dynamics and the skewness parameters. The models discussed here end
in a big rip and become isotropic at finite time.Comment: 9 pages, 13 figures, Version accepted for publication in Mod. Phys.
Lett.
Pengembangan Intelegensi Musikal Siswa Melalui Pembelajaran Musik Di Sekolah
Every human being has two hemispheres of the brain that is the left brain and right brain. The left hemisphere is used to control mental activities that include mathematical skills, language, logic, analysis, writing, and similar activities, while the right hemisphere includes activity such as imagination, color, music, rhythm / rhythm, dreamy and activities similar. The theory of multiple intelligence trying to combine both the ability of the right and left hemispheres of the brain possessed by humans. So according to this theory people can have the ability / intelligence more than one to run its activities where the ability / intelligence is controlled by the right hemisphere and the left brain. All the people in general to be able to develop its intelligence-intelligence and intelligence diligently to train owned by the company in order to develop according to its potential. To educators and prospective educators in particular to be more selective and careful in identifying intelligence possessed by learners, as each protégé has a different intelligence who all wanted to get a good stimulus or response in order to develop intelligence. Develop musical intelligence has its own benefits and advantages of the development of the child.
Keywords: musical intelligence, musical ar
Viability and characterization of the laser surface treatment of engineering ceramics
Laser surface treatment of engineering ceramics offers various advantages in comparison with
conventional processing techniques and much research has been conducted to develop applications.
Even so, there still remains a considerable gap in knowledge that needs to be filled to establish the
process. By employing a fibre laser for the first time to process silicon nitride (Si3N4) and zirconia
(ZrO2) engineering ceramics, a comparison with the CO2 and a Nd:YAG lasers was conducted to
provide fundamental understanding of various aspects of the laser beam-material interaction.
Changes in the morphology, microstructure, surface finish, fracture toughness parameter (K1c) were
investigated, followed by thermal finite element modelling (FEM) of the laser surface treatment and
the phase transformation of the two ceramics, as well as the effects of the fibre laser beam parameter
- brightness (radiance).
Fibre and CO2 laser surface treatment of both Si3N4 and ZrO2 engineering ceramics was performed
by using various processing gases. Changes in the surface roughness, material removal, surface
morphology and microstructure were observed. But the effect was particularly more remarkable
when applying the reactive gases with both lasers and less significant when using the inert gases.
Microcracking was also observed when the reactive gases were applied. This was due to an
exothermic reaction produced during the laser-ceramic interaction which would have resulted to an
increased surface temperature leading to thermal shocks. Moreover, the composition of the ceramics
was modified with both laser irradiated surfaces as the ZrO2 transformed to zirconia carbides (ZrC)
and Si3N4 to silicon dioxide (SiO2) respectively.
The most appropriate equation identified for the determination of the fracture toughness parameter
K1c of the as-received, CO2 and the fibre laser surface treated Si3N4 and ZrO2 was K1c=0.016 (E/Hv)
1/2 (P/c3/2). Surfaces of both ceramics treated with CO2 and the fibre laser irradiation produced an
increased K1c under the measured conditions, but with different effects. The CO2 laser surface
treatment produced a thicker and softer layer whereas the fibre laser surface treatment increased the
hardness by only 4%. This is inconsiderable but a reduction in the crack lengths increased the K1c
value under the applied conditions. This was through a possible transformation hardening which
occurred within both engineering ceramics.
Experimental findings validated the generated thermal FEM of the CO2 and the fibre laser surface
treatment and showed good agreement. However, a temperature difference was found between the
CO2 and fibre laser surface treatment due to the difference in absorption of the near infra-red (NIR)
wavelength of the fibre laser being higher than the mid infra-red (MIR) wavelength of the CO2 laser.
This in turn, generated a larger interaction zone on the surface that was not induced further into the
bulk, as was the case with the fibre laser irradiation. The MIR wavelength is therefore suitable for
Viability and Characterization of the Laser Surface Treatment of Engineering Ceramics
3
the surface processing of mainly oxide ceramics and surface treatments which do not require deep
penetration. Phase transformation of the two ceramics occurred at various stages during the fibre
laser surface treatment. The ZrO2 was transformed from the monoclinic (M) state to a mixture of
tetragonal + cubic (T+C) during fibre laser irradiation and from T+C to T and then a partially liquid
(L) phase followed by a possible reverse transformation to the M state during solidification. The
Si3N4 transformed to a mixture of α-phase and β-phase (α→ α+β) followed by α+β and fully
transforms from α+β →β-phase. What is more, is a comparison of the fibre laser-beam brightness
parameter with that of the Nd:YAG laser. In particular, physical and microstructural changes due to
the difference in the laser-beam brightness were observed.
This research has identified the broader effects of various laser processing conditions, as well as
characterization techniques, assessment and identification of a method to determine the K1c and the
thermal FEM of laser surface treated engineering ceramics. Also, the contributions of laser-beam
brightness as a parameter of laser processing and the influence thereof on the engineering ceramics
have been identified from a fundamental viewpoint. The findings of this research can now be
adopted to develop ceramic fuel cell joining techniques and applications where laser beam surface
modification and characterization of engineering ceramics are necessary
Evaluation of functional outcome of intertrochanteric femur fractures treated with proximal femoral locking compression plate
Background: The objective was to find out the clinical and functional outcome of intertrochanteric femur fractures treated with proximal femoral locking compression plate (PFLCP).Methods: The study was conducted on patients who underwent fixation of intertrochanteric femur fractures with PFLCP in department of orthopedics, GMCH, Aurangabad from January 2020 to January 2021. The patients were assessed clinically and functionally using Harris hip score and radiological evaluation at three, six and nine months.Results: At one year follow up, two patients had varus collapse, one had superficial infection and one had screw cut out. The mean Harris hip score at one month was 69.46 (52-76), at three months was 78.6 (58-88) and at nine months was 87.6 (64-96). The average operative time was 86.23 minutes (60-128 minutes), the average blood loss was 207.5 ml (170-250 ml) and the average time required for union was 15.16 weeks (10-24 weeks).Conclusions: Intertrochanteric fractures treated with PFLCP provided a strong angular stable construct and showed satisfactory outcomes
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