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Sample Entropy as a Tool to Assess Lumbo-Pelvic Movements in a Clinical Test for Low-Back-Pain Patients
22 mars 2022, Thiry, Paul; Nocent, Olivier; BUISSERET, Fabien; Bertucci William; Thévenon, André; Simoneau-Buessinger, Emilie,
- CeREF Technique
,
- Article scientifique
Article scientifique
Low back pain (LBP) obviously reduces the quality of life but is also the world’s leading
cause of years lived with disability. Alterations in motor response and changes in movement patterns
are expected in LBP patients when compared to healthy people. Such changes in dynamics may be
assessed by the nonlinear analysis of kinematical time series recorded from one patient’s motion.
Since sample ...
Head Pitch Angular Velocity Discriminates (Sub-)Acute Neck Pain Patients and Controls Assessed with the DidRen Laser Test
06 avril 2022, BUISSERET, Fabien; HOURY, Martin; Hage, Renaud; DIERICK, Frédéric,
- CeREF Technique
,
- Article scientifique
Article scientifique
Understanding neck pain is an important societal issue. Kinematic data from sensors may help to gain insight into the pathophysiological mechanisms associated with neck pain through a quantitative sensorimotor assessment of one patient. The objective of this study was to evaluate the potential usefulness of artificial intelligence with several machine learning (ML) algorithms in assessing neck ...
High Specificity of Single Inertial Sensor-Supplemented Timed Up and Go Test for Assessing Fall Risk in Elderly Nursing Home Residents
17 février 2022, BUISSERET, Fabien; Schütz, Gaston; Stoffel, Pierre-Loup; DIERICK, Frédéric,
- CeREF Technique
,
- Article scientifique
Article scientifique
The Timed Up and Go test (TUG) is commonly used to estimate the fall risk in the elderly. Several ways to improve the predictive accuracy of TUG (cameras, multiple sensors, other clinical tests) have already been proposed. Here, we added a single wearable inertial measurement unit (IMU) to capture the residents’ body center-of-mass kinematics in view of improving TUG’s predictive accuracy. The aim ...
Motor strategies and adiabatic invariants: The case of rhythmic motion in parabolic flights
05 août 2021, White, Olivier; DIERICK, Frédéric; Dehouck, Victor; BUISSERET, Fabien; Boulanger, Nicolas,
- CeREF Technique
,
- Article scientifique
Article scientifique
The role of gravity in human motor control is at the same time obvious and difficult to isolate. It can be
assessed by performing experiments in variable gravity. We propose that adiabatic invariant theory may be used
to reveal nearly conserved quantities in human voluntary rhythmic motion, an individual being seen as a complex
time-dependent dynamical system with bounded motion in phase space. ...
A First-Quantized Model for Unparticles and Gauge Theories around Conformal Window
02 décembre 2021, Lhost, Guillaume; BUISSERET, Fabien; Boulanger, Nicolas,
- CeREF Technique
,
- Article scientifique
Article scientifique
We first quantize an action proposed by Casalbuoni and Gomis in 2014 that describes two massless relativistic scalar particles interacting via a conformally invariant potential. The spectrum is a continuum of massive states that may be interpreted as unparticles. We then obtain in a similar way the mass operator for a deformed action in which two terms are introduced that break the conformal symmetry: ...
Machine Learning Identifies Chronic Low Back Pain Patients from an Instrumented Trunk Bending and Return Test
03 juillet 2022, Thiry, Paul; HOURY, Martin; PHILIPPE, Laurent; Nocent, Olivier; BUISSERET, Fabien; DIERICK, Frédéric; Slama, Rim; Bertucci, William; Thévenon, André; Simoneau, Emilie,
- CeREF Technique
,
- Article scientifique
Article scientifique
Nowadays, the better assessment of low back pain (LBP) is an important challenge, as it is
the leading musculoskeletal condition worldwide in terms of years of disability. The objective of this
study was to evaluate the relevance of various machine learning (ML) algorithms and Sample Entropy
(SampEn), which assesses the complexity of motion variability in identifying the condition of low back
pain. ...
ZN-balls: Solitons from ZN-symmetric scalar field theory
Article scientifique
We discuss the conditions under which static, finite-energy, configurations of a complex scalar field ϕ
with constant phase and spherically-symmetric norm exist in a potential of the form V(ϕ*ϕ, ϕ^N, ϕ^*N)
with N ∈ N and N ≥ 2, i.e., a potential with a ZN-symmetry. Such configurations are called ZN-balls. We
build explicit solutions in (3 + 1)-dimensions from a model mimicking effective field ...
Many-Quark Interactions: Large-N Scaling and Contribution to Baryon Masses
31 mai 2022, BUISSERET, Fabien; Willemyns, Cintia; Semay, Claude,
- CeREF Technique
,
- Article scientifique
Article scientifique
Starting from an effective Hamiltonian modeling, of a baryon made of N identical quarks in
the large-N approach of QCD, we obtain analytical formulas, allowing to estimate the contributions
of multiquark interactions to the baryon mass. The cases of vanishing (mass spectrum) and nonvanishing
(baryon melting) temperatures are treated.
Wearable Sensors Applied in Movement Analysis
27 octobre 2022, BUISSERET, Fabien; DIERICK, Frédéric; Ven der PErre, Liesbet,
- CeREF Technique
,
- Article scientifique
Article scientifique
The Formulations of Classical Mechanics with Foucault’s Pendulum
Article scientifique
Since the pioneering works of Newton (1643–1727), Mechanics has been constantly reinventing itself: reformulated in particular by Lagrange (1736–1813) then Hamilton (1805–1865), it now offers powerful conceptual and mathematical tools for the exploration of dynamical systems, essentially via the action-angle variables formulation and more generally through the theory of canonical transformations. ...