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Search Results: 1 - 10 of 78 matches for " Emna Braham "
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Wegener’s Granulomatosis Presenting with Bilateral Excavated Nodules  [PDF]
Emna Braham, Hajer Racil, Houda Ben Rejeb, Moncef Hamdane, Abdellatif Chabou, Faouzi El Mezni
Open Journal of Pathology (OJPathology) , 2012, DOI: 10.4236/ojpathology.2012.22006
Abstract: Wegener’s granulomatosis (WG) is a systemic inflammatory disease whose histopathologic features often include necrosis, granuloma formation, and vasculitis of small-to-medium-sized vessels. We report a new case of Wegener’s granulomatosis occurring in a 41-year-old man who was admitted for respiratory symptoms, fever, asthenia, night sweats and weight loss since one month. Chest X-ray and computed tomography showed multiple bilateral pulmonary excavated lesions. A trransparietal lung biopsy was performed. Histological examination showed an area of necrosis, surrounded by a palisade of histiocytes. Some of the histiocytes were multinucleated and formed true granulomas within the wall of the adjacent pulmonary artery. Serology was strongly positive for ANCA. A diagnosis of Wegener granulomatosis was conducted and the patient was started on cyclophosphamide and methylprednisolone as an initial treatment, with a favorable evolution.
About the Feasibility of Personalized Medicine in a Low Income Country?  [PDF]
Mona Mlika, Emna Braham, Soumaya Laabidi, Hamouda Boussen, Faouzi El Mezni
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.35007
Abstract: Personalized medicine is the result of the research made on the field of molecular biology. Lung cancer was mainly concerned with the establishment of many oncogenic drivers. Nowadays, the pathologist is facing a dilemma because of the multiplicity of therapeutic targets and molecular ones and the small size of specimen performed. In fact, 75% of lung cancer are diagnosed on biopsic samples. According to the recommendations of the 2013 International Group Study of Lung Cancer (IASLC), sequential analyses of Epidermal growth factor (EGFR) and anaplastic lym- phoma kinase (ALK) are necessary on adenocarcinomas, non small cell carcinomas not otherwise specified and non small cell carcinomas favor adenocarcinomas. Many interrogations are reported concerning the cost effectiveness of the diagnostic techniques and the targeted treatments. We wondered about the further feasibility of such a technique in a low income country by trying to explore the representativity of the samples. In our hospital, bronchoscopic biopsies are diagnostic in 75% of the cases. We receive a mean of 4 samples. 68% of the samples are tumoral. Immuno-histochemistry is performed in 68% of the cases with a mean of 2 antibodies used and 8% of the biopsies are non interpretable because of the small size of specimen. Concerning transthoracic biopsies, 20% are non contributive because of necrosis or the small size. We receive a mean of 1 sample with a mean size of 6 millimeters. Immunohistochemistry is performed in 71% of the cases with the mean of 2 antibodies. In addition to the scientific, pharmacoeconomic and ethic problems induced by targeted therapies in low income countries, each institution should optimize the use of the specimen received and the technical conditions in order to be ready to answer to the IASLC recommendation.
Invasive Thymoma with Endobronchial Polypoid Growth  [PDF]
Samira Aouadi, Emna Braham, Ayda Ayadi, Houda Gharsalli, Asma Zidi, Adel Marghli, Sonia Maalej, Leila Douik El Gharbi
Open Journal of Respiratory Diseases (OJRD) , 2015, DOI: 10.4236/ojrd.2015.54008
Abstract: Thymomas are the most common neoplasms of the mediastinum. It is common that thymoma invades neighboring structures in the thorax, but direct polypoid tumor growth into the airway is extremely rare. We report a rare case of invasive thymoma with polypoid endobronchial growth in a 66-year-old woman. Computed tomography demonstrated an anterior mediastinal tumor which extended into the right upper lobe. Endoscopic examination revealed a polypoid tumor which occluded the right upper bronchus. A biopsy specimen obtained from the intraluminal mass was very suggestive of thymoma. The patient had no parathymic syndrome. The tumor was resected with the right upper lobe. The final post-operative tissue findings confirmed a type B2 thymoma of the World Health Organisation classification.
Creation of Virtual Wi-Fi Access Point and Secured Wi-Fi Pairing, through NFC  [PDF]
Oussama Stiti, Othmen Braham, Guy Pujolle
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2014, DOI: 10.4236/ijcns.2014.76019
Abstract:

The growing ubiquity of Wi-Fi networks combined with the integration of low-cost Wi-Fi chipsets in all devices makes Wi-Fi as the wireless technology the most used for accessing to internet [1]. This means that the development of a Wi-Fi strategy has become an imperative for almost all operators worldwide. In this context, APs (Access Points) have to become as secure as cellular networks. Furthermore, authentication process between a mobile device and an access point has to be automated, without user constraining configuration. For reaching this purpose, client must have different credentials depending on authentication method. Our goal is to create an architecture that is both ergonomic and flexible in order to meet the need for connection and client mobility. We use NFC technology as a radio channel for starting communication with the network. The communication initiation will instantiate a virtual Wi-Fi AP and distribute all policies and access certificates for an authentication based on EAP-TLS (it could be extended to any EAP method for 802.1X standard). The end result of our new topology is to allow access to services through a virtual Wi-Fi AP with an enterprise-grade in a public hotspot.

Time-Frequency and Time-Scale-Based Fragile Watermarking Methods for Image Authentication
Braham Barkat,Farook Sattar
EURASIP Journal on Advances in Signal Processing , 2010, DOI: 10.1155/2010/408109
Abstract:
Time-Frequency and Time-Scale-Based Fragile Watermarking Methods for Image Authentication
Barkat Braham,Sattar Farook
EURASIP Journal on Advances in Signal Processing , 2010,
Abstract: Two fragile image watermarking methods are proposed for image authentication. The first method is based on time-frequency analysis and the second one is based on time-scale analysis. For the first method, the watermark is chosen as an arbitrary nonstationary signal with a particular signature in the time-frequency plane. Experimental results show that this technique is very sensitive to many attacks such as cropping, scaling, translation, JPEG compression, and rotation, making it very effective in image authentication. For the second method, based on a wavelet-domain multiresolution analysis, quantization index modulation (QIM) embedding scheme and arbitrary frequency-modulated (FM) chirp watermarks are used in the implementation. In this blind technique, the original watermark is needed neither for the content integrity verification of the original image nor for the content quality assessment of the distorted image.
A Kucha? Hypertime Formalism For Cylindrically Symmetric Spacetimes With Interacting Scalar Fields
Stephen P. Braham
Physics , 1993, DOI: 10.1103/PhysRevD.49.5606
Abstract: The Kucha\v{r} canonical transformation for vacuum geometrodynamics in the presence of cylindrical symmetry is applied to a general non-vacuum case. The resulting constraints are highly non-linear and non-local in the momenta conjugate to the Kucha\v{r} embedding variables. However, it is demonstrated that the constraints can be solved for these momenta and thus the dynamics of cylindrically symmetric models can be cast in a form suitable for the construction of a hypertime functional Schr\"odinger equation.
Hypertime Formalism for Spherically Symmetric Black Holes and Wormholes
Stephen P. Braham
Physics , 1994, DOI: 10.1103/PhysRevD.51.536
Abstract: Recent work on an approach to the geometrodynamics of cylindrical gravity waves in the presence of interacting scalar matter fields, based on the Kucha\v{r} hypertime formalism, is extended to the analogous spherically symmetric system. This produces a geometrodynamical formalism for spherical black holes and wormholes in which the metric variables are divided into two classes, dynamical and redundant. The redundant variables measure the embedding of a spacelike hypersurface into the spacetime, and proper time in the asymptotically flat regions. All the constraints can be explicitly solved for the momenta conjugate to the embedding variables. The dynamical variables, including an extra ADM mass for wormhole topologies, can then be considered as functionals of the redundant ones, including the proper time variable. The solution of the resulting constraint system determines the momentum conjugate to the proper time as a function of the other variables, producing Unruh's Hamiltonian formalism for the spherical black hole, whilst extending it to an arbitrary foliation choice. The resulting formalism is appropriate as a starting point for the construction of a hypertime functional Schr\"odinger equation for quantized spherically symmetric black holes and wormholes.
Generalized embedding variables for geometrodynamics and spacetime diffeomorphisms: Ultralocal coordinate conditions
Stephen P. Braham
Physics , 1992, DOI: 10.1063/1.530393
Abstract: We investigate the embedding variable approach to geometrodynamics advocated in work by Isham, Kucha\v{r} and Unruh for a general class of coordinate conditions that mirror the Isham-Kucha\v{r} Gaussian condition but allow for arbitrary algebraic complexity. We find that the same essential structure present in the ultralocal Gaussian condition is repeated in the general case. The resultant embedding--extended phase space contains a full representation of the Lie algebra of the spacetime diffeomorphism group as well as a consistent pure gravity sector.
Electrical Conductivity along Phase Diagram of the Critical Mixture Isobutyric Acid – Water with Added (K+, Cl-) Ions
Emna Cherif,Moncef Bouanz
International Journal of Molecular Sciences , 2003, DOI: 10.3390/i4060326
Abstract: Three systems, isobutyric acid – water (I–W), “(I-W) + 5 10-4 M (KCl)” and “(IW) + 5 10-3 M (KCl)”, have been studied by measuring the electrical conductivity σ (Ω-1cm-1) along the coexistence curve in a single phase, as a function of the variations temperature T and composition X in acid. The coefficient σ is a temperature dependent parameter for ions, increasing as temperature is elevated. Contrary to the visconty, the electrical conductivity does not show any anomaly in the critical region.
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