Mohammed Rahmoune - Academia.edu (original) (raw)

Papers by Mohammed Rahmoune

Lecture notes in networks and systems, 2023

Springer International Publishing eBooks, 2022

E3S Web of Conferences

Throughout this study, we employed unsupervised machine learning clustering algorithms, namely K-... more Throughout this study, we employed unsupervised machine learning clustering algorithms, namely K-Means [1] and hierarchical agglomerative clustering (HAC) [2], to explore human locomotion and wayfinding using a VR Magic Carpet (VMC) [3], a table test version known as the Corsi Block Tapping task (CBT) [4]. This variation was carried out in the context of a virtual reality experimental setup. The participants were required to memorize a sequence of target positions projected on the rug and walk to each target figuring in the displayed sequence. the participant’s trajectory was collected and analyzed from a kinematic perspective. An earlier study [5] identified three different categories, but the classification remained ambiguous, implying that they include both kinds of individuals (normal and patients with cognitive spatial impairments). On this basis, we utilized K-Means and HAC to distinguish the navigation behavior of patients from normal individuals, emphasizing the most importa...

In this paper, a qualitative study is first given to show the influence of the laws of contact, i... more In this paper, a qualitative study is first given to show the influence of the laws of contact, imposed on the constituents interfaces(inclusions-matrix), as well as of type of composites and type of defects or decohesions, on the effective behavior of the "debonded" composite materials. A quantitative analysis is then discussed: we present an energy analysis of some model states of decohesion than may have a composite structure. This energetic study, based on the theory of Francfort and Marigo, consists primarily to reject, for a loading level and a given surface energy (in order of magnitude of e with e=1/n and where n denotes the number of fibers contained in the structure), the decohesions leading to highest energies of medium. The obtained results of this study are interesting, interesting insofar as they can be used in high tech industry to ensure that of this or that debonding can not appear in such composite pieces, subjected to loading of their use services.

The present paper is devoted to an illustration of effective behavior on a classical torsion prob... more The present paper is devoted to an illustration of effective behavior on a classical torsion problem of a fiber-reinforced composite beam with debonded fibers but still in contact with the matrix. We show that the solution in displacement (which is given explicitly), of such problem, is independent on the microscopic variable and it is identical to that of a composite whose fibers are perfectly bonded to the matrix. It is not the same for the bending and traction problems where the associated solutions depend both on microscopic and macroscopic variable and which are different to that of a composite whose constituents are perfectly bonded. Consequently, the debonding of fibers in a composite beam but still in contact with the matrix has therefore not importance when and only when it comes to a torsional loading.

International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 2022

Heterotopic pregnancy once considered a rare phenomenon is now thought to be more common as the o... more Heterotopic pregnancy once considered a rare phenomenon is now thought to be more common as the overall incidence of ectopic pregnancy continues to increase. We report a series of six cases of heterotopic pregnancies seen in our department over a period of seven years. Two of these occurred after assisted reproductive techniques; while the other cases were spontaneous heterotopic pregnancies. The clinical presentation of these cases was varied with late diagnosis occurring in two cases. Preservation of the intrauterine pregnancy was obtained in four cases. Unfortunately, the other cases were aborted spontaneously on the postoperative period. Only with an early diagnosis and adequate management the intrauterine pregnancies will reach viability, with a great chance of a favorable obstetric outcome.

Scholars International Journal of Obstetrics and Gynecology, 2021

The Intrauterine Device is a means of contraception with an efficiency of over 98%. We report the... more The Intrauterine Device is a means of contraception with an efficiency of over 98%. We report the case of a viable pregnancy with an IUD and the risks involved.

MATEC Web of Conferences, 2019

An analytical method on the active vibration control of a functionally graded beam equipped with ... more An analytical method on the active vibration control of a functionally graded beam equipped with layers of piezoelectric sensors and actuators, in a thermal environment, is studied. The study based on Euler-Bernoulli theory and finite element method, applied to a flexible beam divided into a finite number of elements. The equations of motion are obtained by applying the principle of Hamilton. The structure is modeled analytically then numerically and the results of the simulations are presented to visualize the states of their dynamics.

Proc. XI National Conference with International Participation "Electronica 2020", 2020

L'objectif de cette these de doctorat vise a la conception d'un modele d'une structur... more L'objectif de cette these de doctorat vise a la conception d'un modele d'une structure intelligente et son application pour controler la degradation des structures composites stratifiees minces. Dans la premiere partie de cette these, on montre que : - les hypotheses classique consideree par la mecanique pour ce type de systeme n'etaient pas toujours consistantes, - les elements finis standards utilises pour les plaques elastiques sont suffisants pour tenir compte du couplage electromecanique, en modifiant astucieusement la loi de comportement et en introduisant un vecteur des forces electriques. - l'uniformite des potentiels imposes ne permet pas d'agir sur ou de detecter toutes les deformations d'un multicouche contenant des films piezoelectriques. Ceci impose l'utilisation de couches de pastilles piezoelectriques pour pouvoir imposer des potentiels varies. Pour repondre au besoin de l'optimisation de la position des pastilles, on etablit un mod...

Image Registration is a fundamental task in image processing used to match two or more pictures t... more Image Registration is a fundamental task in image processing used to match two or more pictures taken at different times and from different sensors. A various registration measurement have been developed for different types of problems. In this paper we present a novel registration approach based on normalized dissimilarity index which is resulting from local dissimilarity map that is a useful means to compare images. We compared its quality to classical registration measurements (Correlation and Mutual information) carried out on both binarized and grey-level images. We obtained good results for the two types of images. We showed afterwards the robustness of the proposed measure against the pepper and salt and Gaussian noise. We applied finally our registration approach on a medical images database on which we confirmed that the accuracy of alignment error estimation is improve compared to classical registration methods. Index Term— Correlation, images registration, local dissimila...

Evaluating the variations of lesion volume plays an important role in many medical applications. ... more Evaluating the variations of lesion volume plays an important role in many medical applications. It helps radiologists to follow up patients and examine the effects of therapy. Several approaches were being proposed to come up with medical expectations. This work comes within this context. We present a new approach based on the local dissimilarity volume (LDV) that is a 3D representation of the local dissimilarity map (LDM). This map presents a useful means to compare two images offering a localization of information. We proved the reproducibility of this method (LDV) compared to medical techniques used by radiologists. The result of simulations shows that we can quantifying lesion volume by using LDV method which is an efficient way to calculate and localize volume variation of anomalies. It allowed a time-saver with a compete satisfaction of an expert during the medical treatment.

In this paper, we use computational tools (Cipresso P, Matic, A, Giakoumis D, Ostrovsky Y (2015) ... more In this paper, we use computational tools (Cipresso P, Matic, A, Giakoumis D, Ostrovsky Y (2015) Advances in computational psychometrics. Comput Math Methods Med. Article ID 418683. https://doi.org/10.1155/2015/418683.5) to explore human navigation through an example of a visuomotor spatial memory locomotor task, the Walking Corsi task (WCT) variant from a well-known table test known as the Corsi Block Tapping task [(CBT) [2] and [15]. This variant was performed using the “Virtual Carpet” ™ experimental setup. The subjects had to memorize a succession of the position of targets projected on the ground and reproduce sequences of 2 to 9 targets by walking to each. The trajectory of the head was recorded and processed from a kinematic point of view. Generic tools that computational data analytics provides and through computer simulations by replicating visually this data allowed categorization of the different features of the behavior of the subjects providing a new powerful tool for b...

2019 International Conference on Wireless Technologies, Embedded and Intelligent Systems (WITS), 2019

It is commonly believed that Serious Games (SG) are classified as effective and efficient tools t... more It is commonly believed that Serious Games (SG) are classified as effective and efficient tools that bring solutions to the medical field especially the therapeutic one and have several positive aspects. For this reason, in order to help rehabilitation doctors to adapt the medical context to a particular therapeutic game among the available ones is to provide them an easy-to-use model based on simple, intuitive and ergonomic graphic schemes that make it possible and easier for rehabilitation doctors to create and design therapeutic games that can enhance the intrinsic motivation of their patients. The work we present in this article deals with the general problem of designing specific serious games for doctors rather than standard games to help them set up their games in order to recover enough data for interpretation that allows them to measure their patients' progress, in which our approach consists of production games design that permits rehabilitation doctors to take part in...

Rheumatology, Apr 1, 2009

Raashid Luqmani1, Sheena Hennell2, Cristina Estrach3, Damian Basher4, Fraser Birrell5, 6, 7, Ails... more Raashid Luqmani1, Sheena Hennell2, Cristina Estrach3, Damian Basher4, Fraser Birrell5, 6, 7, Ailsa Bosworth8, Frank Burke9, Carole Callaghan10, Jaime Candal-Couto11, Chris Fokke12, Nicola Goodson3, Dawn Homer13, John Jackman14, Paula Jeffreson15, Susan Oliver16, Mike Reed11, Luis Sanz17, Zoe Stableford18, Peter Taylor19, Nick Todd20, Louise Warburton21, Chris Washbrook12 and Mark Wilkinson22, on behalf of the British Society for Rheumatology and British Health Professionals in Rheumatology Standards, ...

Scholars International Journal of Obstetrics and Gynecology

Valsalva hemorrhagic retinopathy is a rare condition, often responsible for a sharp drop in visua... more Valsalva hemorrhagic retinopathy is a rare condition, often responsible for a sharp drop in visual acuity associated with pre-macular retinal hemorrhage. Pregnancy is considered a risk factor. We report a case of Valsalva retinopathy and pregnancy; through a review of the literature we describe the pathophysiological mechanism of this condition as well as the therapeutic management modalities.

Actuators

This paper presents a dynamic study of sandwich functionally graded beam with piezoelectric layer... more This paper presents a dynamic study of sandwich functionally graded beam with piezoelectric layers that are used as sensors and actuators. This study is exploited later in the formulation of the active control laws, while using the optimal control Linear Quadratic Gaussian (LQG), accompanied by the Kalman filter. The mathematical formulation is based on Timoshenko’s assumptions and the finite element method, which is applied to a flexible beam divided into a finite number of elements. By applying the Hamilton principle, the equations of motion are obtained. The vibration frequencies are found by solving the eigenvalue problem. The structure is analytically then numerically modeled and the results of the simulations are presented in order to visualize the states of their dynamics without and with active control.

Journal of Imaging

In medical image processing, evaluating the variations of lesion volume plays a major role in man... more In medical image processing, evaluating the variations of lesion volume plays a major role in many medical applications. It helps radiologists to follow-up with patients and examine the effects of therapy. Several approaches have been proposed to meet with medical expectations. The present work comes within this context. We present a new approach based on the local dissimilarity volume (LDV) that is a 3D representation of the local dissimilarity map (LDM). This map presents a useful means to compare two images, offering a localization of information. We proved the effectiveness of this method (LDV) compared to medical techniques used by radiologists. The result of simulations shows that we can quantify lesion volume by using the LDV method, which is an efficient way to calculate and localize the volume variation of anomalies. It allowed a time savings with the compete satisfaction of an expert during the medical treatment.