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Search Results: 1 - 10 of 4504 matches for " Ibrahim Fofana "
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Integrable fractional mean functions on spaces of homogeneous type
Justin Feuto,Ibrahim Fofana,Konin Koua
Mathematics , 2009,
Abstract: The class of Banach spaces $(L^{q},L^{p}) ^{\alpha}(X,d,\mu)$, $1\leq q\leq \alpha \leq p\leq \infty ,$ introduced in \cite{F1} in connection with the study of the continuity of the fractional maximal operator of Hardy-Littlewood and of the Fourier transformation in the case $% X=\mathbb{R}^{n}$ and $\mu $ is the Lebesgue measure, was generalized in \cite{FFK} to the setting of homogeneous groups. We generalize it here to spaces of homogeneous type and we prove that the results obtained in \cite{FFK} such as relations between these spaces and Lebesgue spaces, weak Lebesgue and Morrey spaces, remain true.
Weighted norms inequalities for a maximal operator in some subspace of amalgams
Justin Feuto,Ibrahim Fofana,Konin Koua
Mathematics , 2009,
Abstract: We give weighted norm inequalities for the maximal fractional operator $ \mathcal M_{q,\beta}$ of Hardy-Littlewood and the fractional integral $I_{\gamma}$. These inequalities are established between $(L^{q},L^{p}) ^{\alpha}(X,d,\mu)$ spaces (which are super spaces of Lebesgue spaces $L^{\alpha}(X,d,\mu)$, and subspaces of amalgams $(L^{q},L^{p})(X,d,\mu)$) and in the setting of space of homogeneous type $(X,d,\mu)$. The conditions on the weights are stated in terms of Orlicz norm.
Une inégalité à poids pour un opérateur type potentiel
A?ssata Adama,Justin Feuto,Ibrahim Fofana
Mathematics , 2011,
Abstract: We establish a weighted inequality for an operator of convolution type, between weak Lebesgue spaces and a Wiener amalgam type space on $ \mathbb R $ equipped with an other measure which need not to be doubling.
Espaces de fonctions à moyenne fractionnaire intégrable sur les groupes localement compacts
Justin Feuto,Ibrahim Fofana,Konin Koua
Mathematics , 2008,
Abstract: Let $G$ be a locally compact group which is $\sigma $-compact, endowed with a left Haar measure $\lambda .$ Denote by $e$ the unit element of $G$, and by $B$ an open relatively compact and symmetric neighbourhood of $e$. For every $(p,q) $ belonging to $[ 1 ; +\infty ] ^{2}$, we give an equivalent and a priori more manageable definition of the Banach space $L_{(q,p)}^{\pi}(G),$ defined by R. C. Busby and H. A. Smith in \cite% {1}. In the case $G$ is a group of homogeneous type, we look at the subspaces $(L^{q},L^{p}) ^{\alpha}(G)$ of the space $% L_{(q,p)}^{\pi}(G)$. Theses subspaces are extensions to non abelian groups of the spaces of functions with integrable mean, defined by I. Fofana in \cite{2}. Finally we show that $L^{\alpha ,+\infty}(G)$ is a complex subspace of $(L^{q},L^{p}) ^{\alpha}(G)$.
Hypertension (HTN) Knowledge and with Its Associated Factors: About 456 Outpatients Seen in Cardiology Department in University Hospital (UH) Gabriel Touré—Bamako (Mali)  [PDF]
Hamidou Oumar Ba, Ichaka Menta, Ibrahima Sangaré, Youssouf Camara, Georges Rosario Christian Millogo, Noumou Sidibé, Ilo Bella Diall, Souleymane Coulibaly, Guida Landouré, Mandé Berthé, Ibrahim Maiga, Bréhima Mariko, Cheick Hamala Fofana, Aladji Traoré, Kassoum Mamourou Sanogo
World Journal of Cardiovascular Diseases (WJCD) , 2018, DOI: 10.4236/wjcd.2018.81004
Abstract: Background: High Blood Pressure (HBP) is high prevalent among adult population in Bamako, but little is known about factors associated with knowledge. Methods: It was a cross-sectional study involving patients aged 15 years and more with a first classification in normal blood pressure (HTN-) and high blood pressure (HTN+), and Second classification inpatients without knowledge (who answered No) (K-) and patients with knowledge (who answered Yes) (K+). A logistic regression was performed to look up predictors among different variables. Results: The sample involved 456 patients with a mean age of 51.39 years and 65.1% of female. The age group 45 - 59 years old made 32.5% and unschooled patients 60.3%. Patients with HBP accounted for 69.7% and those reporting to know about it 67.3%. HTN- and HTN+ differed significantly except for HR, height, sex and level of schooling. HBP prevalence increased with age up to 74 years. Regarding knowledge, sex, age group and number of FDRs did not differ significantly. High education level and duration of HBP was predictive of knowledge with an OR of 1.186 [CI 0.058 - 0.796] and 1.192 [CI 0.332 - 4.275] respectively. Conclusions: Our study provided data on HBP knowledge among outpatients with high educational level and HBP duration associated with better knowledge on HBP.
Pulmonary Hypoplasia: A Rare Cause of Chronic Cough in TB Endemic Area  [PDF]
Ouattara Khadidia, Kanoute Tenin, Baya Bocar, Soumaré Dianguina, Kamian Youssouf Mama, Sidibé Youssouf, Fofana Aminata, Traoré Mohamed Maba, Guindo Ibrahim, Sidibe Fatoumata, Dakouo Aimé Paul, Sanogo Fatoumata Bintou, Bamba Salimata, Coulibaly Lamine, Yossi Oumar, Kone Drissa Samba, Toloba Yacouba
Open Journal of Respiratory Diseases (OJRD) , 2019, DOI: 10.4236/ojrd.2019.91002
Abstract: Pulmonary hypoplasia is a rare disease characterized by a defect of lung development more often unilateral. The diagnosis requires several exams to eliminate other causes of pulmonary retraction. We report two cases at the department of pneumophtisiology of the University Teaching Hospital of Point G. The first case is a young adult who was complaining of a chronic cough. Etiological investigation required several exams including spirometry and Computed tomographic scan (CT scan). After elimination of all suspected causes of pulmonary opacity, the diagnosis of pulmonary hypoplasia was retained. The second case is a 2-year-old girl who was born with congenital cardiopathy whose respiratory complications were increasing during her childhood and respiratory explorations discovered pulmonary agenesis. Pulmonary hypoplasia is rare in our medical practice, but attention must be drawn to a retractile pulmonary opacity in young age after elimination of all infectious causes in TB endemic area.
Les jeunes dans la rébellion du nord de la C te d’Ivoire : les raisons de la mobilisation
Fofana, Moussa
Afrika Focus , 2011,
Abstract: Le conflit armé qui a éclaté en C te d’Ivoire le 19 septembre 2002 a conduit à la partition du pays entre le Nord et le Sud. La rébellion des Forces Nouvelles qui contr le la moitié nord du pays a justifié son action par la dénonciation de l’exclusion et des injustices sociales dont les nordistes seraient les victimes. Cette rébellion a été rejointe par de nombreux jeunes originaires du Nord. Cette étude basée sur les études de cas et biographies de 22 jeunes combattants de la rébellion et des entretiens avec leurs leaders montre les raisons justifiant leur engagement. Elle questionne leurs perceptions du conflit et analyse les rhétoriques de la justification. Il ressort que dans l’ensemble des cas, l’engagement a pour but la reconnaissance de leur citoyenneté qui passe par l’acquisition de cartes d’identités. Le sentiment victimaire né de l’exercice de la violence légale par les forces de l’ordre, la vengeance, le besoin de sécurité ou encore l’attrait pour le métier des armes nourrissent les motivations qui conduisent à l’enr lement des jeunes. L’étude montre aussi l’existence d’un environnement s’appuyant sur la parenté, un discours culturel et la mobilisation de la mémoire ancestrale collective qui ont favorisé l’adhésion des jeunes nordistes au mouvement rebelle. Au-delà des expériences individuelles, l’étude découvre, non une armée ethnique mais plus une organisation à base identitaire engagée dans la renégociation violente de son appartenance nationale.
Audiometric Profile of Deafness at the University Hospital Center Gabriel Toure of Bamako  [PDF]
Kassim Diarra, Boubacary Guindo, Youssouf Sidibé, N’faly Konaté, Ibrahim Fofana, Drissa Kaloga Bagayoko, Fatogoma Issa Koné, Siaka Soumaoro, Doumbia Kadidiatou Singare, Samba Karim Timbo, Mohamed Amadou Keita
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2020, DOI: 10.4236/ijohns.2020.91006
Abstract: Objective: To determine the audiometric profile of deafness in our practice. Materials and Methods: Longitudinal prospective study was conducted out in the ENT department and cervicofacial surgery of Gabriel Toure University Hospital in Bamako, we made an exhaustive sampling of all the patients who consulted for hearing loss, tinnitus, vertigo, hiring report, medical expertise and whose deafness was confirmed to tonal audiometry with an age greater than or equal to 15 years. It was spread over 10 months (June 2016 to March 2017). A total of 200 patients were collected. Exclusion criteria were all patients under 15 years of age as well as deafness related to earwax or foreign bodies, and refusal to participate in the study Results: During our study period, 6055 outpatients were admitted out of which 734 patients underwent audiometric testing and 200 patients (3.30%) met our criteria. The male sex was the most represented with a rate of 60%. The sex ratio was 1.5 or 3 men for 2 women. The 15 to 25 age group was the most represented at 37.5%. The average age was 37.18 years old with extremes ranging from 15 to 83 years old. Pupils/students were the most represented with a rate of 29.5%, followed by housewives in 23%, farmers in 10.5% and military in 10%. As antecedent 26% of our patients had a chronic otitis media (OMC), against 23% who had no antecedent otological and 17% had a traumatic antecedent. Bilateral deafness was the most common with a rate of 64.5%. The mode of progressive appearance was the most frequent in 74.5%. As functional signs 46.22% of our patients had a hearing loss associated with tinnitus. Otoscopic examination was pathological in 34.5% of our patients. Mixed deafness was the most common in 43.35%, followed by perception deafness in 32.19% and transmission deafness 24.46%. Mean deafness was the most common with a rate of 48.91%, was severe in 20.22%, mild in 18.31%, deep in 11.47% and cophotic in 01.09%. Asymmetrical curves were the most found in 65.89% of our patients. Conclusion: Deafness is a sensory disability responsible for communication disorder, sometimes disabling. Audiometry, although subjective, remains essential in the diagnosis of deafness.
Moment Lyapunov exponent of delay differential equations
M. S. Fofana
International Journal of Mathematics and Mathematical Sciences , 2002, DOI: 10.1155/s0161171202012103
Abstract: The aim of this paper is to establish a connecting thread through the probabilistic concepts of pth-moment Lyapunov exponents, the integral averaging method, and Hale's reduction approach for delay dynamical systems. We demonstrate this connection by studying the stability of perturbed deterministic and stochastic differential equations with fixed time delays in the displacement and derivative functions. Conditions guaranteeing stable and unstable solution response are derived. It is felt that the connecting thread provides a unified framework for the stability study of delay differential equations in the deterministic and stochastic sense.
Dimensional reduction of nonlinear time delay systems
M. S. Fofana
International Journal of Mathematics and Mathematical Sciences , 2005, DOI: 10.1155/ijmms.2005.311
Abstract: Whenever there is a time delay in a dynamical system, the study of stability becomes an infinite-dimensional problem. The centre manifold theorem, together with the classical Hopf bifurcation, is the most valuable approach for simplifying the infinite-dimensional problem without the assumption of small time delay. This dimensional reduction is illustrated in this paper with the delay versions of the Duffing and van der Pol equations. For both nonlinear delay equations, transcendental characteristic equations of linearized stability are examined through Hopf bifurcation. The infinite-dimensional nonlinear solutions of the delay equations are decomposed into stable and centre subspaces, whose respective dimensions are determined by the linearized stability of the transcendental equations. Linear semigroups, infinitesimal generators, and their adjoint forms with bilinear pairings are the additional candidates for the infinite-dimensional reduction.
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