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Search Results: 1 - 10 of 13255 matches for " Nouredine El Gareh "
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Cuadrantectomía con mastopexia tipo "donut" versus cuadrantectomía estándar en cáncer de seno: un estudio comparativo prospectivo Doughnut type quadrantectomy with mastopexy versus standard quadrantectomy in breast cancer: a prospective comparative study
María Clara López,Nouredine El Gareh,Olivier Dubon,Jean Pierre Daurés
Revista Colombiana de Cirugía , 2006,
Abstract: Este fue un estudio comparativo prospectivo de 104 pacientes con cáncer de seno, a quienes se ofreció la elección entre dos tratamientos quirúrgicos conservadores: cuadrantectomía con mastopexia tipo donut (Grupo CMD, n=39) o cuadrantectomía estándar (Grupo CE, n=75). Los grupos fueron similares en tama o radiológico del tumor, localización del tumor en el seno, tama o histológico, y la distribución por estadios pT. En el grupo CMD, la incisión de piel fue tres veces más grande que en el grupo CE, pero con ella se obtuvo al final, una cicatriz alrededor del complejo areola-pezón, sin complicaciones posoperatorias posteriores. El volumen promedio del espécimen quirúrgico y los márgenes de sección, fueron mayores en el grupo CMD comparados con el grupo CE. Se obtuvieron márgenes libres de tumor con mayor frecuencia en el grupo CMD que en el grupo CE, pero la diferencia no fue significativa. Estos datos indican fuertemente que la técnica CMD puede ser más eficiente que la técnica CE, en términos de precisión en la resección del tejido mamario. This is a prospective comparative study comprising 104 patients with breast cancer to which two modalities of conservative therapy were offered: quadrantectomy with mastopexy doughnut type (group QMD, n = 39) or standard quadrantectomy (group QS, n = 75). The two groups had similar tumor size, location of the tumor, histology size and PT distribution. In the QMD group the skin incision was three times greater than in the QS group, but a good healing around the areola-nipple complex was achieved without postoperative complications. Both the size of the surgical specimen and the free margins were greater in the QMD group. Free section margins were more frequently achieved in the QMD group, but the difference was not significant. Our date strongly indicate that the QMD technique can be more efficient that the QS in terms of precision of mammary tissue resection.
Cuadrantectomía con mastopexia tipo "donut" versus cuadrantectomía estándar en cáncer de seno: un estudio comparativo prospectivo
López,María Clara; El Gareh,Nouredine; Dubon,Olivier; Daurés,Jean Pierre; Robledo,José Fernando; Giacalone,Pierre-Ludovic;
Revista Colombiana de Cirugía , 2006,
Abstract: this is a prospective comparative study comprising 104 patients with breast cancer to which two modalities of conservative therapy were offered: quadrantectomy with mastopexy doughnut type (group qmd, n = 39) or standard quadrantectomy (group qs, n = 75). the two groups had similar tumor size, location of the tumor, histology size and pt distribution. in the qmd group the skin incision was three times greater than in the qs group, but a good healing around the areola-nipple complex was achieved without postoperative complications. both the size of the surgical specimen and the free margins were greater in the qmd group. free section margins were more frequently achieved in the qmd group, but the difference was not significant. our date strongly indicate that the qmd technique can be more efficient that the qs in terms of precision of mammary tissue resection.
Effect of Prior-Heat Treatments on the Creep Behavior of an Industrial Drawn Copper  [PDF]
Zakaria Boumerzoug, Salim Gareh, Abdellatif Beribeche
World Journal of Condensed Matter Physics (WJCMP) , 2012, DOI: 10.4236/wjcmp.2012.24041
Abstract: The effect of prior-heat treatments at 500℃, 600℃ and 700℃ on the creep behavior of an industrial drawn copper has been studied under constant stresses (98, 108 and 118 MPa) and temperatures (290℃ and 340℃). The results revealed that the creep behavior and the creep life of the material depend strongly on these prior-heat treatments. The apparent activation energy Qc for different creep tests of a drawn copper wire was calculated. The fracture mechanism of the material is characterized using optical microscopy.
The Nuclear Born Oppenheimer Method and Nuclear Rotations
Nouredine Zettili
Physics , 2009,
Abstract: We deal here with the application of the Nuclear Born Oppenheimer (NBO) method to the description of nuclear rotations. As an edifying illustration, we apply the NBO formalism to study the rotational motion of nuclei which are axially-symmetric and even, but whose shells are not closed. We focus, in particular, on the derivation of expressions for the rotational energy and for the moment of inertia. Additionally, we examine the connection between the NBO method and the self-consistent cranking (SCC) model. Finally, we compare the moment of inertia generated by the NBO method with the Thouless-Valantin formula and hence establish a connection between the NBO method and the large body of experimental data.
Weighted Scatter-Difference-Based Two DimensionalDiscriminant Analysis for Face Recognition  [PDF]
Hythem Ahmed, Mohamed Jedra, Nouredine Zahid
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.44017
Abstract: Linear Discriminant Analysis (LDA) is a well-known scheme for feature extraction and dimension. It has been used widely in many applications involving high-dimensional data, such as face recognition, image retrieval, etc. An intrinsic limitation of classical LDA is the so-called singularity problem, that is, it fails when all scatter matrices are singular. A well-known approach to deal with the singularity problem is to apply an intermediate dimension reduction stage using Principal Component Analysis (PCA) before LDA. The algorithm, called PCA + LDA, is used widely in face recognition. However, PCA + LDA have high costs in time and space, due to the need for an eigen-decomposition involving the scatter matrices. Also, Two Dimensional Linear Discriminant Analysis (2DLDA) implicitly overcomes the singular- ity problem, while achieving efficiency. The difference between 2DLDA and classical LDA lies in the model for data representation. Classical LDA works with vectorized representation of data, while the 2DLDA algorithm works with data in matrix representation. To deal with the singularity problem we propose a new technique coined as the Weighted Scatter-Difference-Based Two Dimensional Discriminant Analysis (WSD2DDA). The algorithm is applied on face recognition and compared with PCA + LDA and 2DLDA. Experiments show that WSD2DDA achieve competitive recognition accuracy, while being much more efficient.
Multiple Tracking of Moving Objects with Kalman Filtering and PCA-GMM Method  [PDF]
Emadeldeen Noureldaim, Mohamed Jedra, Nouredine Zahid
Intelligent Information Management (IIM) , 2013, DOI: 10.4236/iim.2013.52006
Abstract:
In this article we propose to combine an integrated method, the PCA-GMM method that generates a relatively improved segmentation outcome as compared to conventional GMM with Kalman Filtering (KF). The combined new method the PCA-GMM-KF attempts tracking multiple moving objects; the size and position of the objects along the sequence of their images in dynamic scenes. The obtained experimental results successfully illustrate the tracking of multiple moving objects based on this robust combination
Secondary Construction of Resilient Functions and Plateaued Functions: Study Their Algebraic Immunity
Belmeguenai Aissa,Doghman Nouredine
Journal of Applied Sciences , 2007,
Abstract: In this study, we first give a survey of the Siegenthaler’s constructions and the general Carlet’s construction of resilient functions, permitting to obtain resilient functions achieving the best possible trade-offs between resiliency order, algebraic degree and nonlinearity. Then, we introduce and we study a new secondary construction of resilient functions based on the principal of the siegenthaler’s construction. This construction permitted to increase the algebraic immunity, algebraic degree and define many more resilient functions where the degree, algebraic immunity, resiliency and nonlinearity achieving are high. Thus, permits to obtain resilient functions achieving the best possible trade-offs between resiliency order, algebraic degree and nonlinearity (that is, achieving Siegenthaler’s and Sarkar, al.’s bounds). We conclude the paper by generalizing our construction to plateaued functions.
An Adaptative Multi-GPU based Branch-and-Bound. A Case Study: the Flow-Shop Scheduling Problem
Imen Chakroun,Nouredine Melab
Computer Science , 2012,
Abstract: Solving exactly Combinatorial Optimization Problems (COPs) using a Branch-and-Bound (B&B) algorithm requires a huge amount of computational resources. Therefore, we recently investigated designing B&B algorithms on top of graphics processing units (GPUs) using a parallel bounding model. The proposed model assumes parallelizing the evaluation of the lower bounds on pools of sub-problems. The results demonstrated that the size of the evaluated pool has a significant impact on the performance of B&B and that it depends strongly on the problem instance being solved. In this paper, we design an adaptative parallel B&B algorithm for solving permutation-based combinatorial optimization problems such as FSP (Flow-shop Scheduling Problem) on GPU accelerators. To do so, we propose a dynamic heuristic for parameter auto-tuning at runtime. Another challenge of this work is to exploit larger degrees of parallelism by using the combined computational power of multiple GPU devices. The approach has been applied to the permutation flow-shop problem. Extensive experiments have been carried out on well-known FSP benchmarks using an Nvidia Tesla S1070 Computing System equipped with two Tesla T10 GPUs. Compared to a CPU-based execution, accelerations up to 105 are achieved for large problem instances.
Design and Simulation of Double S Shaped Metamaterial
Hayet Benosman,Nouredine Boukli Hacene
International Journal of Computer Science Issues , 2012,
Abstract: Metamaterials are defined as artificial electromagnetic structures based on the assembly of magnetic resonators and infinitely long metal rods at sub wavelength scale, which have the negative permittivity and the negative permeability simultaneously in a specific frequency range. However there are also some new metamaterial structures being explored which exhibit the same behavior. In this paper, we present the design, and simulation of a double S-shaped metamaterial in the microwave range. The design tool is the HFSS software which uses the finite element method. The extraction of effective parameters by the method of reflection- transmission coefficients demonstrates the metamaterial behavior of the said structure.
Monte Carlo simulation of the transmission of measles: Beyond the mass action principle
Nouredine Zekri,Jean Pierre Clerc
Quantitative Biology , 2001, DOI: 10.1103/PhysRevE.65.046108
Abstract: We present a Monte Carlo simulation of the transmission of measles within a population sample during its growing and equilibrium states by introducing two different vaccination schedules of one and two doses. We study the effects of the contact rate per unit time $\xi $ as well as the initial conditions on the persistence of the disease. We found a weak effect of the initial conditions while the disease persists when $\xi $ lies in the range 1/L-10/L ($L$ being the latent period). Further comparison with existing data, prediction of future epidemics and other estimations of the vaccination efficiency are provided. Finally, we compare our approach to the models using the mass action principle in the first and another epidemic region and found the incidence independent of the number of susceptibles after the epidemic peak while it strongly fluctuates in its growing region. This method can be easily applied to other human, animals and vegetable diseases and includes more complicated parameters.
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