Computer Modeling in Engineering & Sciences,
Год журнала:
2020,
Номер
125(2), С. 815 - 828
Опубликована: Янв. 1, 2020
The
modeling
and
risk
assessment
of
a
pandemic
phenomenon
such
as
COVID-19
is
an
important
complicated
issue
in
epidemiology,
attempt
great
interest
for
public
health
decision-making.
To
this
end,
the
present
study,
based
on
recent
heuristic
algorithm
proposed
by
authors,
time
evolution
investigated
six
different
countries/states,
namely
New
York,
California,
USA,
Iran,
Sweden
UK.
number
COVID-19-related
deaths
used
to
develop
model
it
believed
that
predicted
daily
each
country/state
includes
information
about
quality
system
area,
age
distribution
population,
geographical
environmental
factors
well
other
conditions.
Based
derived
epidemic
curves,
new
3D-epidemic
surface
assess
at
any
its
evolution.
This
research
highlights
potential
tool
which
can
assist
COVID-19.
Mapping
development
through
revealing
dynamic
nature
differences
similarities
among
districts.
Mathematical Problems in Engineering,
Год журнала:
2021,
Номер
2021, С. 1 - 15
Опубликована: Фев. 5, 2021
The
main
objective
of
this
study
is
to
evaluate
and
compare
the
performance
different
machine
learning
(ML)
algorithms,
namely,
Artificial
Neural
Network
(ANN),
Extreme
Learning
Machine
(ELM),
Boosting
Trees
(Boosted)
considering
influence
various
training
testing
ratios
in
predicting
soil
shear
strength,
one
most
critical
geotechnical
engineering
properties
civil
design
construction.
For
aim,
a
database
538
samples
collected
from
Long
Phu
1
power
plant
project,
Vietnam,
was
utilized
generate
datasets
for
modeling
process.
Different
(i.e.,
10/90,
20/80,
30/70,
40/60,
50/50,
60/40,
70/30,
80/20,
90/10)
were
used
divide
into
assessment
models.
Popular
statistical
indicators,
such
as
Root
Mean
Squared
Error
(RMSE),
Absolute
(MAE),
Correlation
Coefficient
(R),
employed
predictive
capability
models
under
ratios.
Besides,
Monte
Carlo
simulation
simultaneously
carried
out
proposed
models,
taking
account
random
sampling
effect.
results
showed
that
although
all
three
ML
performed
well,
ANN
accurate
statistically
stable
model
after
1000
simulations
(Mean
R
=
0.9348)
compared
with
other
Boosted
0.9192)
ELM
0.8703).
Investigation
on
greatly
affected
by
training/testing
ratios,
where
70/30
presented
best
Concisely,
herein
an
effective
manner
selecting
appropriate
predict
strength
accurately,
which
would
be
helpful
phases
construction
projects.
Expert Systems with Applications,
Год журнала:
2022,
Номер
206, С. 117754 - 117754
Опубликована: Июнь 11, 2022
Rotating
equipment
is
considered
as
a
key
component
in
several
industrial
sectors.
In
fact,
the
continuous
operation
of
many
machines
such
sub-sea
pumps
and
gas
turbines
relies
on
correct
performance
their
rotating
equipment.
order
to
reduce
probability
malfunctions
this
equipment,
condition
monitoring,
fault
diagnosis
systems
are
essential.
work,
novel
approach
proposed
perform
based
permutation
entropy,
signal
processing,
artificial
intelligence.
To
that
aim,
vibration
signals
employed
for
an
indication
bearing
performance.
facilitate
diagnosis,
detection
isolation
performed
two
separate
steps.
As
first,
once
received,
faulty
state
determined
by
entropy.
case
detected,
type
using
processing
Wavelet
packet
transform
envelope
analysis
utilized
extract
frequency
components
fault.
The
allows
automatic
selection
band
includes
characteristic
resonance
fault,
which
subject
change
different
operational
conditions.
method
works
extracting
proper
features
used
decide
about
bearing's
multi-output
adaptive
neuro-fuzzy
inference
system
classifier.
effectiveness
assessed
Case
Western
Reserve
University
dataset:
demonstrates
method's
capabilities
accurately
diagnosing
faults
compared
existing
approaches.
Buildings,
Год журнала:
2022,
Номер
12(2), С. 132 - 132
Опубликована: Янв. 27, 2022
Concrete
is
one
of
the
most
popular
materials
for
building
all
types
structures,
and
it
has
a
wide
range
applications
in
construction
industry.
Cement
production
use
have
significant
environmental
impact
due
to
emission
different
gases.
The
fly
ash
concrete
(FAC)
crucial
eliminating
this
defect.
However,
varied
features
cementitious
composites
exist,
understanding
their
mechanical
characteristics
critical
safety.
On
other
hand,
forecasting
concrete,
machine
learning
approaches
are
extensively
employed
algorithms.
goal
work
compare
ensemble
deep
neural
network
models,
i.e.,
super
learner
algorithm,
simple
averaging,
weighted
integrated
stacking,
as
well
separate
stacking
order
develop
an
accurate
approach
estimating
compressive
strength
FAC
reducing
high
variance
predictive
models.
Separate
with
random
forest
meta-learner
received
predictions
(97.6%)
highest
coefficient
determination
lowest
mean
square
error
variance.