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Complementarity of Sentinel-1 and Sentinel-2 Data for Mapping Agricultural Areas in Senegal

Advances in Remote Sensing 2020年第3期9卷 101-115页

作者： Gayane Faye Fama Mbengue Lacina Coulibaly Mamadou Adama Sarr Modou Mbaye Amath Tall Dome Tine Omar Marigo mouhamadou moustapha mbacke ndour Laboratoire de Télédétection Appliquée Institut des Sciences de la Terre Cheikh Anta DIOP University of Dakar (LTA/IST/UCAD) Dakar Senegal Laboratoire de Géomatique Environnementale école de Foresterie Université de Moncton Nouveau-Brunswick Canada Centre de Suivi Ecologique (CSE) of Dakar Dakar Senegal Laboratoire d’études et de Recherche en Statistique et Développement UFR de Sciences Appliquées et de Technologie Département de Mathématiques Appliquées Université Gaston BERGER of Saint-Louis Dakar Senegal Ecole Nationale Supérieure d’Agriculture (ENSA) Thies University Thies Senegal UFR Science de l’Ingenieur Thies University Thies Senegal

The small size of agricultural plots is the main difficulty for crops mapping with remote sensing data in the Sahelian region of Africa. The study aims to combine Sentinel-1 (radar) and Sentinel-2 (Optic) data to discriminate millet, maize and peanut crops. Training plots were used in order to analyse temporal variation of the three crops’ signals. The NDVI (Normalized Difference Vegetation Index) was able to differentiate crops only at the end of the rainy season (October). The optical data as well as the radar ones could not easily discriminate the three crops during the growing season, because in that period vegetation cover is low, and soil contribution to the signals (due to roughness and moisture) was more important than that of real vegetation. However, the ratio of VH/VV (VH: incident signal in vertical polarization and reflected signal in horizontal polarization;VV: incident signal in vertical polarization and reflected signal in horizontal polarization) gave a difference between millet and the two other crops at the beginning cultural season (July 11). Difference appears from the second third of September when the harvest of cereals crops (millet and maize) began. From middle of October, the peanut signal dropped sharply thus facilitating the differentiation of peanut from the two other crops. This analysis led to the identification of data that have could be used to discriminate these crops (useful data). Classification of the combined useful data gave an overall high accuracy of 82%, with 96%, 61% and 65% for peanut, maize and millet, respectively. The non-agricultural areas (water, natural vegetation, habit, bare soil) were well classified with an accuracy greater than 90%.

关键词： Agricultural Areas Remote Sensing Sentinel-1 Sentinel-2 Senegal

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Treatment of Kidney Stones by Percutaneous Nephrolithotomy: Evaluation of the Results of the First Series of Our Experience in the Urology Department of the Idrissa Pouye General Hospital in Dakar

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Open Journal of Urology 2024年第2期14卷 104-114页

作者： mouhamadou moustapha Mbodji Mohamed Jalloh Medina Ndoye Abdourahmane Diallo Issa Labou Lamine Niang Serigne Magueye Gueye Department of Urology and Andrology Hospital General Idrissa Pouye Dakar Senegal

The principle of PCNL is the extraction through a nephrostomy channel of kidney stones which are defined as the presence of crystalline concretions in the kidneys. Objectives: The objective of this work was to study the epidemiological, clinical and paraclinical aspects of patients with renal lithiasis treated by PCNL and on the other hand the different technical aspects of PCNL. Materials and Methods: This was a retrospective descriptive study, conducted in the urology department of HOGIP, covering the period from January 2015 to January 2019. We studied the demographic and clinical aspects of patients presenting renal lithiasis;we also studied the technical aspects and treatment outcomes. Statistical significance was set for α = 0.05. Results: Our series covered 82 PCNLs performed during the study period. The average age was 45.95 years, the age group [40 - 49 years] was more affected. Our study involved 44 men and 38 women, a sex ratio of 1.15. At the clinic, atypical lumbar pain was more frequent in 45.83% of cases. On URO-CT, the calculations were located more at the pyelic level (31.2%) and lower caliceal (27.2%). The size of stones measured between 15 and 20 mm in 30.52%. The stone density was between 500 and 1000 HU in 47.54% of cases. Intraoperatively, the patients were placed in lateral decubitus in 41.46% of cases. Only one access to the kidney was necessary in 87.8% of cases. The lithoclast was used in 65.85% of cases. The overall success rate (stone free) in our series was 96%. The majority of cases, 41.44%, drainage were done by natural means (totally tubeless). The average duration was 92 minutes. The complications encountered in our experience concerned 10 cases, a rate of 12.19%. Conclusion: Urinary lithiasis is more and more frequent in our regions. The development of Endo-urology offers several therapeutic options. Thus, PCNL occupies an important place in the management of kidney stones.

关键词： HOGIP Kidney Stones PCNL Stone Free Uro CT Scan

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Superior Mesenteric Artery Syndrome, a Rare Complication of Severe Malnutrition: Two Cases from a Subsaharian Endocrinology Department

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Open Journal of Endocrine and Metabolic Diseases 2024年第4期14卷 87-93页

作者： Nafy Ndiaye Ngone Diaba Diack Yakham Mohamed Leye Sokhna Awa Balla Sall Moussa Gueye Mouhamed Fawaz mouhamadou moustapha Ndong Abdoulaye Leye Department of Internal Medecine and Endocrinology Teaching Hospital of Pikine Dakar Senegal

Introduction: Superior mesenteric artery syndrome (SMAS), a rare diagnosis due to compression of the third duodenum between the superior mesenteric artery (SMA) and the aorta resulting in bowel obstruction, may lead to severe malnutrition. We report two cases of patients hospitalised in the Internal Medicine, Endocrinology, Diabetology, and Nutrition Department of the National Hospital Center (NHC) of Pikine. Observations: Patient 1: A 35-year-old female was referred for an aetiological diagnosis due to a rapid weight loss of 15 kilograms in one month, accompanied by persistent vomiting, following an appendectomy performed a month before admission. Upon clinical examination, she presented severe malnutrition (Buzby index of 76%), early post-prandial chronic vomiting, and a poor general condition. An abdominal CT scan revealed aortomesenteric clamp syndrome (AMCS) with an angulation between the aorta and the SMA of 13˚. The underlying cause in this patient was severe malnutrition. Fortunately, her condition improved with medical treatment. Patient 2: We report the case of a 30-year-old female hospitalized due to unusual weight-bearing post-prandial epigastric pain and intermittent vomiting over the past six months. Upon physical examination at admission, she exhibited severe malnutrition with a body mass index (BMI) of 14 kg/m2, a Buzby index of 71%, trophic disorders, and a stage IV general condition assessment according to the World Health Organization (WHO). An abdominal CT scan revealed AMCS with an angle between the aorta and the SMA of 22˚ and an aortomesenteric space of 4 mm. The outcome was poor with medical treatment failure and, unfortunately, the patient died before surgery. Conclusion: SMAS is rarely evoked in clinical practice despite the presence of contributing factors and suggestive clinical signs. The prognosis depends on management time.

关键词： Superior Mesenteric Artery Syndrome Malnutrition Pikine

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Surgical Treatment of the Upper Urinary Tract Lithiasis at the Urology Department of the Hopital General Idrissa Pouye

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Open Journal of Urology 2024年第5期14卷 290-300页

作者： mouhamadou moustapha Mbodji Mohamed Jalloh Medina Ndoye Abdou Fall Cheikh Gassama Babou Sakho Serigne Mbacké Ndiaye Moussa Sene Abdourahmane Diallo Issa Labou Lamine Niang Department of Urology and Andrology Hopital General Idrissa Pouye Dakar Senegal

Upper urinary tract lithiasis is a condition characterized by the presence of stones which is a stony concretion of crystallized substances in the kidney and/or ureter. Objective: The objective of this work is to study the epidemiological, clinical and therapeutic aspects of upper urinary tract stones on the one hand, then to compare the different types of surgical treatments and their results. Materials and Methods: This is a retrospective and descriptive study focusing on the surgical management of upper urinary tract stones, between January 2017 and December 2020, at the Urology department of the Hopital General Idrissa Pouye. Results: During the study period, 7.59% of surgical interventions performed were related to the treatment of upper urinary tract stones. Average age was 45.20 ± 16.4 years, the age group [41 - 60] years was more affected with 42.68%. A history of urolithiasis was present in 25.52% of cases. Lower back pain was present in 97.48% of cases. On URO-CT scan, the stone was located more at the level of the ureter (49.57%). The size between 10 to 15 mm was more frequent (30.96%) and the density greater than 1000 HU was more frequent (33.47%). The most used therapeutic procedure was ureteroscopy (52.08%), followed by PCNL (40.83%) and open surgery (7.08%). The success rate (stone free) was 93.68% for the URS, 89.36% for the PCNL. The length of hospital stay for open surgery was 6.76 ± 4.25, for PCNL 2.62 ± 2 days and for URS 1.75 ± 1.62 days. Postoperative complications were present in 23.52% for open surgery, 11.22% for PCNL and 8% for URS. Conclusion: Urolithiasis is constantly growing in our regions. Effective endourological treatment is increasingly replacing open surgery. However, global access to these new techniques in our regions is slow to be effective.

关键词： Endo-Urology Open Surgery Renal Lithiasis Ureteral Lithiasis URO-CT Scan

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Overview of Adrenals Tumors in Dakar Hospitals

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Open Journal of Internal Medicine 2024年第2期14卷 141-150页

作者： Nafy Ndiaye Yakham Mohamed Leye mouhamadou moustapha Ndong Ngoné Diaba Diack Amadou Fall Cisse Abdoulaye Leye Baidy Sy Kane Alpha Omar Touré Cherif Mohamed Dial Pape Saloum Diop Internalmedeccine and Endocrinology Department Teaching Hospital of Pikine Dakar Senegal General Surgery Department Aristide Le Dantec Teaching Hospital of Dakar Dakar Senegal Anatomo-Pathology Department General Hospital of Grand Yoff Dakar Dakar Senegal General Surgery Department General Hospital of Grand Yoff Dakar Dakar Senegal

Introduction: Adrenal tumours (AT) are commonly encountered in clinical practice. For any patient presenting an adrenal mass, there are two crucial points to consider: is the adrenal mass malignant and is it hormonally active? The objective of our study was to evaluate the epidemiological, diagnostic, therapeutic, and evolutionary aspects of AT in a developing country. Methodology: We conducted a retrospective study spanning 17 years (from January 2005 to October 2022) in four Dakar hospital services. We included all patient medical records with explored AT. Results: AT was diagnosed in 35 patients who had a mean age of 36.62 years (range: 12-79), and a female predominance (26 women to 9 men). Among these patients, 17.2 % had incidental AT. Hypertension was the commonest presenting symptom in 27 patients (77%), which was associated with Mnards triad in 14 patients (40%). Abdominal pain was reported by 20 patients (57%), and 14 presented with an abdominal mass. Among the patients, 29 had functional AT: 22 with pheochromocytoma, 5 with primary hyperaldosteronism, and 2 with hypercortisolism. Imaging evaluations revealed that 33 patients had unilateral AT and one had bilateral AT. Tumour sizes varied, 5 patients had tumours 10 cm. Two patients presented with metastases. The therapeutic approach involved adrenalectomy in 32 patients. Perioperative complications were observed in five patients, including haemorrhage (two patients), hypotension (two cases), and hypertensive crisis (one case). One patient with bilateral pheochromocytoma developed acute adrenal insufficiency postoperatively, followed by abdominal herniation. Histopathological examination confirmed pheochromocytoma in 21 patients, Conns adenoma in 5, adrenocortical carcinoma in 3, cortisol adenoma in 2, and adrenal cyst in 1 patient. Non-functional AT included adrenocortical carcinoma (three patients), adrenal cyst (one patient), and pheochromocytoma (two patients). After a one-year follow-up, 29 patients wit

关键词： Tumour Adrenal Pheochromocytoma Conn Adrenocortical Carcinoma Dakar

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Evolution of the Spatial Distribution of Basic Infrastructures and Services in the Niakhar Area (Fatick), Senegal

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Journal of Geographic Information System 2023年第6期15卷 611-628页

作者： Alphousseyni Ndonky mouhamadou moustapha Mbacké ndour Pape Boubou Sow Rosalie Diouf Engineering Sciences Training and Research Unit University Iba Der Thiam of Thies Thies Senegal School of Applied Economics Cheikh Anta Diop University Dakar Senegal

Basic infrastructures and services present an important socio-economic and territorial equity issue, because the availability of these makes it possible to improve the living conditions of populations, makes territories attractive and stimulates their development. The objective of our study has been achieved, so our results provided information on the rate of propagation of basic infrastructures and services, as well as the evolution of the forms of spatial distribution of the latter. The data used comes from the census and geolocation of basic infrastructures and services in the Niakhar area, carried out by the IRD in 2018. Centrographic measurements were used to describe the overall spatial distribution and the use of chi-square statistics confirmed the existence of a preferential direction of distribution. To verify the existence of a spatial structure of infrastructure and service seeding, the Ripley statistic is used. Our results can be useful for land use planning and spatial resource allocation policies. Indeed, the identification of different types of spatial aggregates and the highlighting of the preferred directions of the distribution of basic infrastructures and services, make it possible to correct disparities in the spatial distribution of basic resources.

关键词： Spatial Structure Spatial Disparities Ripley Statistic Centrographic Measurements

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Hierarchy of Rural Localities in the Niakhar Area (Fatick, Senegal)

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Journal of Geographic Information System 2022年第3期14卷 221-239页

作者： Alphousseyni Ndonky mouhamadou moustapha Mbacké ndour Ibrahima Ndiaye Richard Lalou Pape Boubou Sow Engineering Sciences Training and Research Unit University of Thies Thies Senegal School of Applied Economics Cheikh Anta Diop University Dakar Senegal MERIT_UMR 216/IRD Paris Descartes University Paris France

Although the study of the hierarchy of localities presents an important social and economic stake, studies focused on the hierarchy of rural localities are relatively weak, especially in Africa. It is important to highlight the hierarchy of rural areas in order to reveal poles that can support sustainable growth. Our main objective is to study the hierarchy of rural localities in the Niakhar area, using a geographic approach. The data come from the Niakhar demographic, epidemiological and environmental observatory database and the Niakhar Atlas project of the French Research Institute for Development (IRD). The net flow method, the primacy index, the median population threshold method and the measurement of the correlation between level of centrality and population size are used to analyze the data. Our study allowed us to determine the main types of centrality and to establish the hierarchy of rural localities in the Niakhar zone. It also highlighted the strong correlation between the rank of localities and the size of the population of the latter. The main contribution of our work is to have highlighted, in order, the structuring localities of the rural space of the Niakhar area, by combining several indicators of centrality.

关键词： Hierarchy Rural Localities Centrality Population Size Service Functions Attractiveness

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Ultra-Violet (UV): A Good Bacterial Sterilizer?

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Journal of Biosciences and Medicines 2023年第2期11卷 80-85页

作者： Sira Sidibe mouhamadou moustapha Boye Maryam mouhamadou Ali Traore Biomedical Engineering Department Polytechnical University of West Africa Dakar Senegal Laboratory of Fundamental and Applied Microbiology University Cheikh Anta Diop Dakar Senegal

Introduction: The aim of this study was to improve the DISTER-UV and to perform microbiological quality control at the biomedical laboratory of the West African Polytechnic University from January 2022 to November 2022. Methodology: During this eleven-month prospective study, we set up a quality control device (QCD). For microbiological quality control, we performed different cultures of bacteria with different bacteriological and morphological characteristics at T0 (no sterilization) and at T30 (after 30 minutes of sterilization under DISTER-UV). Results: After the realization, the DCQ attached to the DISTER-UV1 allows to display of the UV wavelength present in the light box. This device also displays and alerts when the UV intensity emitted by the lamps is below 250 nm. During microbiological quality control, the cultures carried out at T30 and incubated for 24 hours did not reveal any bacterial colonies. This shows the bactericidal character of DISTER-UV-2. Conclusion: The improvement and the microbiological quality control allowed us to switch from DISTER-UV1 (without sensor) to DISTER-UV-2 (with sensor or DCQ). The biological control allowed us to affirm that the DISTER-UV-2 is bactericidal.

关键词： Sterilization Ultraviolet Radiation Bactericide Quality Control Bacteria

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White Blood Cells Detection Using Spectral Tresholding

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Journal of Signal and Information Processing 2023年第1期14卷 1-8页

作者： Kamara Ndèye Lama Boye mouhamadou moustapha Traore Ali Biomedical Engineering Department Polytechnical University of West Africa Dakar Senegal Laboratory of Fundamental and Applied Microbiology University Cheikh Anta Diop Dakar Senegal

The study of the morphology of White Blood Cells (WBCs) further contributes to the clinical diagnosis of blood diseases. In this research paper, we come up with an image segmentation enhancement by combining Fourier Fast Transform on smear blood capture and classical thresholding. The Fast Fourier Transform (FFT) is a very powerful tool in image processing and it was used to segment and extract the WBCs. Our image processing method uses a Fast Fourier Transform combined with filtering and an Inverse Fast Fourier Transform for the extraction and visualization of the high frequency region of the image. In order to remove residual Red Blood Cells acting as noise in the expected result, a final thresholding step is added at the end of the processing. The results presented in this article report the tests performed using our mathematical implementation. Moreover, we were able to detect and differentiate the sub-families of WBCs.

关键词： Segmentation Fourier Transform White Blood Cell

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Multidisciplinary Approach for a Solution to Floods in SampathéDistrict (Thiès-Est, Senegal)

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Journal of Geographic Information System 2020年第6期12卷 663-682页

作者： mouhamadou moustapha Mbacké ndour Alassane Thiam Bakary Fall Ibrahima Seye Unité de Formation et de Recherches-Sciences de l’Ingénieur Université of Thiès Thiès Sénégal Centre de Suivi Ecologique Dakar Sénégal Grande Cô te Opération Sa Dakar Sénégal

In recent years (2003), Senegal has been confronted with many urban flooding problems that have become recurrent due to the configuration of its settlement. This is due to galloping population growth, climate change and a lack of planning and rainwater drainage networks. To fix these phenomena, Senegalese government has initiated rainwater drainage programs. In the city of Thiès, particularly in Sampathé district, flooding problem is a reality that is observed during every winter period. It is within this framework that we have proposed a project for the design and dimensioning of a rainwater evacuation network in Sampathé. The network will be integrated into a Geographic Information System for efficient management of project. This study involved identifying flood zones, determining geotechnical characteristics of the soil, and exploiting rainfall data in order to propose a storm water drainage network that will be integrated into a database management system. Thus, we carried out topographical and geotechnical studies, then designed and dimensioned the drainage network, and finally set up a geographic information system. At the end of this project, we designed a sewerage network consisting of two primary pipelines, four secondary pipelines, one tertiary pipeline, ninety-two manholes and a retention basin. To manage the network, we set up a geographic information system to geolocate various elements for rapid intervention in the field in event of a problem, make requests, generate thematic maps, and perform spatial analyses for good decision-making.

关键词： Flood Flooding Sewerage Network Topographic Surveys Geographic Information System Sampathé

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