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Search Results: 1 - 10 of 364 matches for " Chadi Dib "
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Takotsubo Cardiomyopathy with a Dramatically Rapid Resolution  [PDF]
Muhammad Alichaudhry, Chadi Dib, Ralph Lazzara
International Journal of Clinical Medicine (IJCM) , 2011, DOI: 10.4236/ijcm.2011.22025
Abstract: Takotsubo cardiomyopathy is a relatively rare disease entity with a rapid reversible ventricular dysfunction, which usually occurs in post–menopausal women, and is frequently associated with a stressful event. Diagnosing Takotsubo cardiomyopathy can sometimes be challenging. The absence of coronary artery obstructive disease, and the dramatic presentation of the patient mimicking acute coronary syndrome, make this disease unique. We discuss here a case of Takotsubo cardiomyopathy with extremely rapid resolution in just two days, which we believe is being reported for the first time and touch briefly on the salient features, pathogenesis, diagnosis, treatment, prognosis, and clinical significance of this unique entity.
Malignant Arrhythmia in Apical Ballooning Syndrome: Risk Factors and Outcomes
Chadi Dib,Abhiram Prasad,Paul A. Friedman,Ahmad Elesber
Indian Pacing and Electrophysiology Journal , 2008,
Abstract: Objectives: We sought to determine the frequency and outcomes with symptomatic arrhythmia in patients with apical ballooning syndrome (ABS). Methods: A retrospective review of the Mayo Clinic Angiography database was conducted to identify patients who met the Mayo criteria for ABS. Patients with documented arrhythmias formed the study group, and 31 randomly selected patients with ABS but without arrhythmia formed the control group.Results: Out of 105 patients identified with ABS, 6 (5.7%) women aged 69 +/- 9 years experienced significant arrhythmia (ventricular fibrillation, asystole), 2 patients died, and 1 required permanent pacemaker implantation. When compared with controls, the study group showed no significant difference with respect to ECG characteristics (QT, QRS duration or axis) except for R-R interval variability (see comments below) (30.6±6 vs 14.5±17 p = 0.0004), QTc, and P-R interval. Patients without arrhythmia were more likely to be on beta-blocker therapy than the study population (33% vs 80.6% p = 0.02). Conclusion: Life-threatening arrhythmia is uncommon (5.7%) with ABS despite marked, structural abnormalities. When arrhythmias do occur, the outcome is poor. Prominent variability in R-R intervals appears to be predictive of significant arrhythmias in ABS. The role of beta-blocker therapy in preventing arrhythmia with ABS requires further investigation.
A Remote Robotic Laboratory Experiment Platform with Error Management
Chadi Riman
International Journal of Computer Science Issues , 2011,
Abstract: Remote control of experiments is gaining more importance in training and education. However, remote real-time training on instruments programming still have some unresolved problems such as error management. In this paper, a platform for training students on system's control by Tele-Programming is presented. Programming sessions can be done by the trainee at many levels of control with built-in error management in order to avoid system freezing or malfunction. We showed an illustrative application: programming navigation control of a mobile robot in the presence of obstacles using fuzzy control.
The Chern Invariants for Parabolic Bundles at Multiple Points
Taher Chadi
Mathematics , 2011,
Abstract: If $ D \in X$ is a curve with multiple points in a surface, a parabolic bundle defined on $(X;D)$ away from the singularities can be extended in several ways to a parabolic bundle on a resolution of singularities. We investigate the possible parabolic Chern classes for these extensions.
Calculating the parabolic Chern character of a locally abelian parabolic bundle
Chadi Taher
Mathematics , 2009,
Abstract: We calculate the parabolic Chern character of a bundle with locally abelian parabolic structure on a smooth strict normal crossings divisor, using the definition in terms of Deligne-Mumford stacks. We obtain explicit formulas for $ch_1$, $ch_2$ and $ch_3$, and verify that these correspond to the formulas given by Borne for $ch_1$ and Mochizuki for $ch_2$.
A Paradigm for Channel Assignment and Data Migration in Distributed Systems
Chadi Kari
Computer Science , 2010,
Abstract: In this manuscript, we consider the problems of channel assignment in wireless networks and data migration in heterogeneous storage systems. We show that a soft edge coloring approach to both problems gives rigorous approximation guarantees. In the channel assignment problem arising in wireless networks a pair of edges incident to a vertex are said to be conflicting if the channels assigned to them are the same. Our goal is to assign channels (color edges) so that the number of conflicts is minimized. The problem is NP-hard by a reduction from Edge coloring and we present two combinatorial algorithms for this case. The first algorithm is based on a distributed greedy method and gives a solution with at most $2(1-\frac{1}{k})|E|$ more conflicts than the optimal solution.The approximation ratio if the second algorithm is $1 + \frac{|V|}{|E|}$, which gives a ($1 + o(1)$)-factor for dense graphs and is the best possible unless P = NP. We also consider the data migration problem in heterogeneous storage systems. In such systems, data layouts may need to be reconfigured over time for load balancing or in the event of system failure/upgrades. It is critical to migrate data to their target locations as quickly as possible to obtain the best performance of the system. Most of the previous results on data migration assume that each storage node can perform only one data transfer at a time. However, storage devices tend to have heterogeneous capabilities as devices may be added over time due to storage demand increase. We develop algorithms to minimize the data migration time. We show that it is possible to find an optimal migration schedule when all $c_v$'s are even. Furthermore, though the problem is NP-hard in general, we give an efficient soft edge coloring algorithm that offers a rigorous $(1 + o(1))$-approximation guarantee.
Analysis of trophic responses in lesioned brain: focus on basic fibroblast growth factor mechanisms
Chadi, G.;Fuxe, K.;
Brazilian Journal of Medical and Biological Research , 1998, DOI: 10.1590/S0100-879X1998000200007
Abstract: the actions of fibroblast growth factors (fgfs), particularly the basic form (bfgf), have been described in a large number of cells and include mitogenicity, angiogenicity and wound repair. the present review discusses the presence of the bfgf protein and messenger rna as well as the presence of the fgf receptor messenger rna in the rodent brain by means of semiquantitative radioactive in situ hybridization in combination with immunohistochemistry. chemical and mechanical injuries to the brain trigger a reduction in neurotransmitter synthesis and neuronal death which are accompanied by astroglial reaction. the altered synthesis of bfgf following brain lesions or stimulation was analyzed. lesions of the central nervous system trigger bfgf gene expression by neurons and/or activated astrocytes, depending on the type of lesion and time post-manipulation. the changes in bfgf messenger rna are frequently accompanied by a subsequent increase of bfgf immunoreactivity in astrocytes in the lesioned pathway. the reactive astrocytes and injured neurons synthesize increased amount of bfgf, which may act as a paracrine/autocrine factor, protecting neurons from death and also stimulating neuronal plasticity and tissue repair
Generic Skills to Reduce Failure Rates in an Undergraduate Accounting Information System Course
Raymond Young,Chadi Aoun
Asian Social Science , 2009, DOI: 10.5539/ass.v4n10p60
Abstract: This paper reports on an initiative to reduce the failure rate in an undergraduate accounting information systems course without compromising academic standards. The initiative relied on the development of generic skills in the major assessment tasks. The result was to significantly improve the amount of effort students applied to their internal assessment tasks and also to reduce the overall failure rate. Recommendations are made for practice and linked to the literature on failure in academia.
JOINT CHANNEL-DIVERSITY CODING FOR THE THREE-WAY FREE-SPACE OPTICAL SYSTEMS THROUGH ATMOSPHERIC-TURBULENCE CHANNELS
Chadi Abou-Rjeily
International Journal of New Computer Architectures and their Applications , 2011,
Abstract: In this paper, we study the communications over the free-space optical (FSO) links in the presence of atmospheric turbulence that induces strong fading on the FSO channel. We consider the three-way systems where a wireless transceiver (or relay) that is present in the neighborhood of the source and destination shares its resources for assisting the source in delivering its message to the destination. In particular, we derive the error performance of the three-way FSO systems that are implemented with a convenient combination of channel and diversity coding. This joint channel-diversity coding that is associated with adapted decoding at the relay and the destination results in a better immunity against noise and fading and results in high performance levels over a very wide range of the signal-to-noise ratio. Another appealing feature of the considered system resides in the fact that the error protection is not associated with any reduction in the data rate.
Analysis of trophic responses in lesioned brain: focus on basic fibroblast growth factor mechanisms
Chadi G.,Fuxe K.
Brazilian Journal of Medical and Biological Research , 1998,
Abstract: The actions of fibroblast growth factors (FGFs), particularly the basic form (bFGF), have been described in a large number of cells and include mitogenicity, angiogenicity and wound repair. The present review discusses the presence of the bFGF protein and messenger RNA as well as the presence of the FGF receptor messenger RNA in the rodent brain by means of semiquantitative radioactive in situ hybridization in combination with immunohistochemistry. Chemical and mechanical injuries to the brain trigger a reduction in neurotransmitter synthesis and neuronal death which are accompanied by astroglial reaction. The altered synthesis of bFGF following brain lesions or stimulation was analyzed. Lesions of the central nervous system trigger bFGF gene expression by neurons and/or activated astrocytes, depending on the type of lesion and time post-manipulation. The changes in bFGF messenger RNA are frequently accompanied by a subsequent increase of bFGF immunoreactivity in astrocytes in the lesioned pathway. The reactive astrocytes and injured neurons synthesize increased amount of bFGF, which may act as a paracrine/autocrine factor, protecting neurons from death and also stimulating neuronal plasticity and tissue repair
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