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Nonparametric estimation for stationary and strongly mixing processes on Riemannian manifolds

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Communications in Mathematics and Statistics 2022年第4期10卷 599-621页

作者： Amour T.Gbaguidi Amoussou Freedath Djibril Moussa Carlos Ogouyandjou mamadou abdoul diop IMSP Universitéd’Abomey-Calavi(UAC)DangboBenin FAST Universitéd’Abomey-CalaviAbomey-CalaviBenin UniversitéGaston Berger DakarSenegal

In this paper,nonparametric estimation for a stationary strongly mixing and manifoldvalued process(X_(j))is *** this non-Euclidean and not necessarily i.i.d setting,we propose kernel density estimators of the joint probability density function,of the conditional probability density functions and of the conditional expectations of functionals of X_(j)given the past behavior of the *** prove the strong consistency of these estimators under sufficient conditions,and we illustrate their performance through simulation studies and real data analysis.

关键词： Riemannian manifolds Nonparametric estimation Kernel density estimation Stationary and strongly mixing processes Strong consistency

Carotid Web as a Cause of Ischemic Stroke in Sub-Saharan Africa: A Preliminary Monocentric Descriptive Study of 6 Cases Collected at the Fann Teaching Hospital (Senegal)

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World Journal of Cardiovascular Diseases 2022年第3期12卷 133-139页

作者： Ndiaga Matar Gaye Alassane mamadou diop Adjaratou Dieynabou Sow abdoul Salam Soumaré Didier Smadja Moustapha Ndiaye Sokhna Ba Amadou Gallo diop Neurology Department Fann Teaching Hospital Dakar Senegal Stroke Unit Centre Hospitalier Sud-Francilien Corbeil-Essones France Radiology Department Fann Teaching Hospital Dakar Senegal

Introduction: Carotid web (CW), a rare and probably unknown arterial cause of ischemic stroke (IS), is commonly reported in young black patients, although most of the published cases resided in a non-African country. We describe the features of the first six Senegalese cases diagnosed at the Neurology Department of the Fann Teaching Hospital in Dakar. Patients and Method: It was a preliminary retrospective and prospective study conducted at the Neurology department of Fann teaching hospital (Dakar-Senegal). The symptomatic CW diagnosis was based on angioCT-scan of the neck arteries. The National Institute of Health Stroke Scale (NIHSS) and the modified-Rankin Scale (mRS) were used to assess the severity of the IS and the functional disability after the event, respectively. Results: CW was causing a left sylvian infarction in 4 patients. The mean age of the patients at the IS diagnosis was 41 ± 6 years with a sex ratio of 1. The mean time to diagnosis of CW was 13 months. Smoking (1/6), hypertension (1/6), and obesity (1/6) were the main vascular risk factors. The mean LDL cholesterol level was 1.52 g/L ± 0.49. The mean initial NIHSS was 15 ± 6 (8-22). Half of the patients had a severe infarction (NIHSS ≥ 15). For secondary prevention, half of the patients were treated with aspirin and the other half with acenocoumarol. After 18 months ± 17 of follow-up, the mean mRS score was 2 ± 1 (1-3). Conclusion: CW is an unknown cause of IS in young black patients. An early and appropriate multidisciplinary management could help to reduce the risk of recurrences.

关键词： Carotid Web Sub-Saharan Africa Senegal AngioCT-Scan Acenocoumarol

Three New Hydrogenosuccinate and Succinate Adducts Complexes:Synthesis and Spectroscopic Study

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Journal of Environmental Science and Engineering(A) 2024年第6期13卷 207-210页

作者： Boucar Diouf Waly Diallo Bocar Traoré Daouda Ndoye Cheikh abdoul Khadir diop mamadou Sidibé Département de Chimie Laboratoire de Chimie Minérale et Analytique Facultédes Sciences et TechniquesUniversitéCheikh Anta Diop de DakarDakar 5050Sénégal

One new hydrogenosuccinate and two succinate adduct and complex have been synthesized and studied by infrared,UV-Visible and NMR(Nuclear Magnetic Resonance Spectroscopy)^(119)Sn *** suggested structure is discrete,the hydrogenosuccinate behaving as a monodentate ligand or only involved in hydrogen bonding,the environment around the magnesium centre being triangular(compound 3).The succiate anion is a monochelating ligand(compound 1 and 2).In all the suggested structures,when extra hydrogen bonds are considered,supramolecular architectures are obtained(compound 2 and 3).

关键词： Discrete structures hydrogen bonds monochelating monodentate triangular or trigonal bipyramidal or tetrahedral environments

Conjugate Gradient Method to Solve Fluid Structure Interaction Problem

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Applied Mathematics 2017年第4期8卷 444-452页

作者： mamadou diop Ibrahima Mbaye Thies University Thies Senegal Department of Mathematics and Computer Science Thies University Thies Senegal

In this paper, we propose a method to solve coupled problem. Our computational method is mainly based on conjugate gradient algorithm. We use finite difference method for the structure and finite element method for th... 详细信息

关键词： Fluid-Structure Interaction Beam Stokes Finite Element Finite Difference Method Conjugate Gradient Method

Assessment of Obstetric Evacuations: Received during the Year 2020 at the Touba Ndamatou Public Health Hospital Establishment

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Open Journal of Obstetrics and Gynecology 2022年第6期12卷 528-540页

作者： Babacar Biaye Mouhamadou Wade Daba diop Abdou Karim Diallo Mor Ndiaye Alioune diop Awa Ndiaye mamadou Sene abdoul Aziz Diouf Mamour Gueye Université Cheikh Anta diop Dakar Senegal

The counter-referral system is particularly important for care during pregnancy, childbirth and the post-partum period as it facilitates access to emergency obstetric and neonatal care. It allows people to access care that is not likely to be provided at the base and to manage certain complications arising in emergency settings. We therefore looked at the evaluation of obstetric evacuations from the Touba Ndamatou public health. Methodology: This was a retrospective study of descriptive and analytical type extending over a period of 12 months from January 1, 2020 to December 31, 2020 at the public hospital health establishment (PHHE) of Touba Ndamatou. Results: One thousand five hundred and sixty (1560) patients evacuated for obstetrical reasons were collected out of a total admission of 5560, i.e., a frequency of 28%. The average age of the patients was 25.54 years. The mean gestation was 3.24 pregnancies. The average parity was 3.04 deliveries. Almost all of our patients (99%) were married. Slightly more than one in two women (53.6%) had performed at least 2 or 3 Prenatal consultations. 80% of parturients had traveled a distance of less than 20 km. 623 patients came by their own means (54.6%). Evacuation was provided by an ambulance in 509 patients, i.e., 44.6%. Arterial hypertension and its complications were the frequent reason for evacuations with approximately one in four patients (26.2%). Only 3.6% of patients had qualified personnel on board being evacuated. In our series, 13 deaths were recorded, i.e., 1.1% of cases. The distance traveled seemed not to influence the future of the mother (p = 0.51). The non-accompaniment of the patient during the evacuation by a medical staff seemed to influence the prognosis of the mother (p = 0.031). Fetal morbidity was higher among evacuees not accompanied by medical personnel. The state of apparent death was observed in the majority of cases in patients received over a distance of more than 20 km. Conclusion: Evacuation

关键词： Evacuation Pregnancy Senegal

How a Cancer Registry Was Set Up in Senegal: An Example to Follow for a Developing Country

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Journal of Cancer Therapy 2023年第9期14卷 382-389页

作者： Salif Baldé Sokhna diop Niang Oumar Ba mamadou diop Joliot Curie Institute Aristide Le Dantec Hospital Dakar Senegal Departmentof Internal Medicine Dalal Jamm Hospital Dakar Senegal Department of Internal Medicine Idrissa Pouye Hospital Dakar Senegal

Objectives: Senegal, with the support of WHO, had begun the establishment of a National Cancer Registry in 2009, although it had been at a standstill since 1969;the objective of this work was to test the reliability of data collection tools and feasibility stages necessary for the validation of media before the establishment of a national cancer registry. Methodology: We conducted a non-exhaustive preliminary study over a period of three months from the first of January to 31 March 2010 at four major hospitals in Dakar at the time. Results: Two hundred and eighty-nine cases had been identified: 44% of men (n = 127) and 56% of women (n = 162) with a sex ratio of 0.8. The ages ranged from 20 to 90 years with an average of 50 years. The main diagnostic mode was essentially histological, with 76% of cases (n = 219). The most frequent locations were: ORL (ENT meaning Ear, Nose and Throat) with 25% of cases, liver 7% and bronchopulmonary 4.5% of cases. In men, liver cancer was the most common location and women for cervical cancer with 16%. Squamous cell carcinoma was the most common histological type with 68% of cases followed by adenocarcinoma with 22% of cases. Thirty-eight percent of patients were classified as stage III and IV. A quarter of our patients had received palliative treatment. In contrast, 15 (15%) had received chemotherapy and 4% had received radiotherapy. Data collection was satisfactory. Conclusion: Cancer is a reality in Senegal but it remains underdiagnosed. The materials made it possible to make the cancer registry effective throughout the country.

关键词： Registry Cancer Senegal

Study of Radio over Fiber Transmission with a Single Line in Ring Topology for Deployment of MIMO Antenna Access Points in a Cell-less Network

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Journal of Sensor Technology 2023年第2期13卷 13-23页

作者： mamadou Sarr Dialo diop Ndolane Diouf Kharouna Talla Solids Physics and Materials Sciences Loboratory Group Faculty of Science and Technology Cheikh Anta Diop University Dakar Senegal

The massive growth of wireless traffic goes hand in hand with the deployment of advanced radio interfaces as well as network densification. This growth has a direct impact on the radio access architecture, which today is moving from centralized to distributed deployments through the use of a large number of access points (APs). This paper verifies the feasibility of deploying multiple APs in series on a single line in a ring topology in a cell-less network. On the one hand, this technique will further improve the communication capacity and flexibility of a Radio-over-Fiber (RoF) based mobile communication system and will reduce its construction cost. And on the other hand, this deployment topology is a solution to achieve a massive cell-free Multiple-Input Multiple-Output (MIMO) architecture and a cost-effective fronthaul solution. First, a passive optical add/drop multiplexer (OADM) is used to extract and add downlink and uplink signals from the remote access points of one kilometer. Then, a deployment model is developed with version 17 Optisystem software. The results obtained showed that the quadrature amplitude modulation (QAM) does not adapt to this multi-carrier transmission to deploy several AP in series on a single line. Thus, the performance degradation increases when the number of APs integrated on the line increases.

关键词： RoF Ring Topology MIMO Antennas Cell-less Network

Comparative Study between the PID Regulator and the Fuzzy Regulator Applied to the Operation of a Brushless DC Motor

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Energy and Power Engineering 2021年第11期13卷 365-376页

作者： mamadou Sall abdoulaye Kebe Ibrahima Gueye Moustapha diop Laboratoire L3EPI Ecole Supérieure Polytechnique Ecole Normale Supérieure d’Enseignement Technique et Professionnel Université Cheikh Anta Diop Dakar Senegal

This paper presents the results of research on speed regulation of a brushless DC motor. This is mainly a comparative study between a PID regulator and a fuzzy regulator applied to the operation of this type of engine in order to find the best control. The BLDC engine must operate under various speed and load conditions with improved performance and robust and complex speed control. Because of this complexity, the traditional PID command encounters difficulties in controlling the speed of a BLDC. Another control technique is currently developing and is producing good results. This is the fuzzy controller that handles process control problems, that is, managing a process based on a given set point per action on the variables that describe the process. To achieve the desired results, the brushless DC machine model will be studied. With the model obtained, both types of regulator will be tested. A synthesis of the observed comparison results will enable a conclusion to be drawn on the performance of the two types of regulators driving a BLDC (Brushless DC).

关键词： Fuzzy Logic Controller PID Controller Brushless DC Motor DC Motor

Restoration or Rehabilitation of the Faleme River Affected by Mining Activities: What Methods?

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Journal of Water Resource and Protection 2024年第4期16卷 233-263页

作者： Mor diop Ibrahima Mall Elhadji mamadou Sonko Tidiane diop Birane Niane Cheikh Mbow Environmental Sciences Institute (ISE) Cheikh Anta Diop university of Dakar Dakar Senegal Higher School of Mines Geology and Environment Amadou Mahtar Mbow University of Diamniadio (UAM) Dakar Senegal Department of Chemical Cheikh Anta Diop university of Dakar Dakar Senegal Departmentof Engineering Sciences Iba Der Thiam University of Thi&#232s Thi&#232s Senegal

The Faleme River, a West Africa long transboundary stream (625 km) and abundant flow (>1100 million m3) is affected by severe erosion because of mining activities that takes place throughout the riverbed. To preserve this important watercourse and ensure the sustainability of its services, selecting and implementing appropriates restorations techniques is vital. In this context, the purpose of this paper was to present an overview of the actions and techniques that can be implemented for the restoration/rehabilitation of the Faleme. The methodological approach includes field investigation, water sampling, literature review with cases studies and SWOT analysis of the four methods presented: river dredging, constructed wetlands, floating treatment wetlands and chemical precipitation (coagulation and flocculation). The study confirmed the pollution of the river by suspended solids (TSS > 1100 mg/L) and heavy metals such as iron, zinc, aluminium, and arsenic. For the restoration methods, it was illustrated through description of their mode of operation and through some case studies presented, that all the four methods have proven their effectiveness in treating rivers but have differences in their costs, their sustainability (detrimental to living organisms or causing a second pollution) and social acceptance. They also have weaknesses and issues that must be addressed to ensure success of rehabilitation. For the case of the Faleme river, after analysis, floating treatment wetlands are highly recommended for their low cost, good removal efficiency if the vulnerability of the raft and buoyancy to strong waves and flow is under control.

关键词： Faleme River River Restoration Constructed Wetlands Dredging Floating Treatment Wetlands Coagulation-Flocculation