IEEE Access,
Год журнала:
2019,
Номер
7, С. 116809 - 116822
Опубликована: Янв. 1, 2019
Isotropy,
end
effect
suppression,
calculation
efficiency
and
robustness
are
basic
requirements
of
areal
filters
for
surface
metrology.
However,
current
cause
problems
in
different
aspects,
which
cripples
the
operation
metrology
like
roughness
evaluation.
In
this
paper,
a
high-order
thin-plate
spline
(TPS)
filter
is
proposed
to
construct
real
isotropic
with
minimum
effects
high
efficiency,
aiming
provide
more
universal
efficient
topography
filtration
method.
The
new
structured
by
approximating
Gaussian
ensure
uniform
transmission
characteristics.
robust
algorithm
derived
process
data
outliers
defects.
A
fast
implementation
also
provided
paper.
Performances
various
illustrated
processing
both
simulated
practical
surfaces,
through
TPS
herein
manifests
isotropy,
higher
slighter
as
well
comparing
filters.
Comparing
ISO
16610-61,
can
obtain
ideal
results,
therefore
it
take
place
16610-61
on
most
occasions.
IEEE Transactions on Aerospace and Electronic Systems,
Год журнала:
2018,
Номер
55(2), С. 747 - 756
Опубликована: Авг. 10, 2018
In
this
paper,
a
novel
fractional-order
fuzzy
sliding
mode
control
strategy
is
developed
to
realize
the
deployment
of
tethered
satellite
system
(TSS)
with
input
saturation.
The
considered
TSS
modeled
as
an
underactuated
system.
By
decoupling
into
two
subsystems,
and
constrained
integer-order
surfaces
are
designed
for
actuated
unactuated
respectively.
Then,
new
hybrid
manifold
obtained
by
coupling
subsliding
surfaces.
Adaptive
algorithm
used
regulate
coefficient
in
newly
proposed
order
procure
satisfactory
performance.
Meanwhile,
saturation
nonlinearity
also
considered.
asymptotic
stability
closed-loop
demonstrated
theoretically.
With
existence
fractional
order,
presented
controller
can
perform
faster
more
smooth
tether
when
compared
conventional
ones.
Finally,
effectiveness
superiority
approach
validated
illustrative
simulations.
International Journal of Robust and Nonlinear Control,
Год журнала:
2018,
Номер
28(17), С. 5326 - 5343
Опубликована: Сен. 7, 2018
Summary
This
paper
investigates
an
adaptive
state
feedback
control
problem
for
a
class
of
single‐input
and
single‐output
nonlinear
systems
with
strict‐feedback
form.
A
novel
strategy
is
developed
unmodeled
dynamics,
unknown
directions,
dynamic
disturbances
dead
zone.
To
stabilize
this
category
systems,
signal
introduced
to
dominate
the
dynamics.
Nussbaum
gain
technique
used
overcome
directions
problem.
Nonlinear
damping
terms
are
framed
counteract
disturbances,
assistant
constructed
compensate
influence
symmetric
The
approach
ensures
all
signals
in
closed‐loop
system
be
bounded.
Finally,
numerical
example
verify
effectiveness
theoretical
results.
IEEE Transactions on Biomedical Engineering,
Год журнала:
2020,
Номер
68(2), С. 448 - 460
Опубликована: Июнь 23, 2020
Detection
of
Atrial
fibrillation
(AF)
from
premature
atrial
contraction
(PAC)
and
ventricular
(PVC)
is
difficult
as
frequent
occurrences
these
ectopic
beats
can
mimic
the
typical
irregular
patterns
AF.
In
this
paper,
we
present
a
novel
density
Poincaré
plot-based
machine
learning
method
to
detect
AF
PAC/PVCs
using
electrocardiogram
(ECG)
recordings.
IEEE Transactions on Cybernetics,
Год журнала:
2018,
Номер
49(8), С. 3032 - 3040
Опубликована: Июнь 8, 2018
This
paper
is
concerned
with
the
sliding
mode
control
of
nonlinear
singular
systems
in
terms
interval
type-2
(IT2)
fuzzy
model.
To
better
approximate
systems,
modeling
errors
are
considered
IT2
The
uncertainties
membership
functions
expressed
based
on
their
boundedness.
Admissibility
conditions
obtained
via
a
linear
matrix
inequalities
approach.
A
new
reaching
law-based
controller
presented
by
choosing
typical
surface
to
analyze
motion,
such
that
all
input
gains
allowed
be
different
and
chattering
system
can
minimized
guaranteed
H∞
performance.
feasibility
proposed
method
verified
simulation
results.
IEEE/ASME Transactions on Mechatronics,
Год журнала:
2018,
Номер
24(1), С. 175 - 185
Опубликована: Окт. 26, 2018
This
paper
presents
a
simplified
Newton-based
contouring
error
estimation
(CEE)
method
and
discrete-time
fractional-order
sliding-mode
control
(CEC)
strategy
to
obtain
an
excellent
motion
performance
for
multidimensional
systems.
Specifically,
the
CEE
(SNE)
is
modified
from
Newton
extremum
seeking
algorithm.
Compared
with
existing
CEE,
SNE
keeps
high
precision;
meanwhile,
it
requires
less
computing
resources
avoids
possible
singularity
as
no
derivatives
are
demanded
during
calculation.
Moreover,
form
of
rather
simple
in
system
designed
cost
function
takes
vectors
into
consideration
innovatively.
To
improve
further,
CEC
(DFSMC)
proposed
when
designed.
A
novel
sliding
surface
addressed,
conclusion
on
its
stability
linear
matrix
inequality
given
out.
Furthermore,
dynamics
entire
also
analyzed
this
paper.
At
last,
groups
comparative
experiments
implemented
2-degree-of-freedom
linear-motor
table,
whose
results
validate
efficiency
SNE-DFSMC
strategy.
IEEE Access,
Год журнала:
2019,
Номер
7, С. 11905 - 11912
Опубликована: Янв. 1, 2019
The
bilateral
teleoperation
technique
has
drawn
much
attention
with
its
attractive
superiority
to
implement
the
tasks
in
hazardous
environments.
Transmission
delays
and
uncertainties
are
two
main
challenges
nonlinear
system
guarantee
stability
achieve
good
transparency
performance
(including
position
tracking
force
feedback)
simultaneously.
In
this
paper,
a
radial
basis
function
neural
network
(RBFNN)-based
adaptive
sliding
mode
control
design
is
developed
for
transmission
uncertainties.
For
details,
reference
trajectory
producer
designed
both
master
slave
sides
produce
passive
trajectories
of
master/slave
manipulators.
RBFNN-based
controller
separately
under
To
mitigate
negative
effect
on
system's
stability,
projection
mapping
by
saturation
applied
side
boundedness
delayed
environmental
torque.
Thus,
global
feedback
can
be
simultaneously
achieved
our
proposed
method.
comparative
experiment
carried
out,
results
show
significant
improvement
design.
Forensic Science International Synergy,
Год журнала:
2022,
Номер
5, С. 100272 - 100272
Опубликована: Янв. 1, 2022
We
describe
and
validate
a
feature-based
system
for
calculation
of
likelihood
ratios
from
3D
digital
images
fired
cartridge
cases.
The
includes
database
the
bases
10
cartridges
per
firearm
approximately
300
firearms
same
class
(semi-automatic
pistols
that
fire
9
mm
diameter
centre-fire
Luger-type
ammunition,
have
hemispherical
firing
pins
parallel
breech-face
marks).
were
captured
using
Evofinder®,
an
imaging
is
commonly
used
by
operational
forensic
laboratories.
A
key
component
research
reported
comparison
different
feature-extraction
methods.
Feature
sets
compared
include
those
previously
proposed
in
literature,
plus
Zernike-moment
based
features.
Comparisons
are
also
made
feature
extracted
firing-pin
impression,
region,
whole
region
interest
(firing-pin
impression
+
flowback
if
present).
Likelihood
calculated
statistical
modelling
pipeline
standard
voice
comparison.
Validation
conducted
results
assessed
validation
procedures
metrics
graphics
