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Dynamic denoising studies in wideband radio channel measurement and modeling

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The Journal of China Universities of Posts and Telecommunications 2014年第5期21卷 43-46页

作者： coulibaly Balla moussa ZHAO Xiong-wen LIANG Xiao-lin LI Shu LI Yi-wei School of Electrical and Electronic Engineering North China Electric Power University

The fixed level and dynamic denoising method was studied based on indoor-to-outdoor measured channel impulse responses ORs） at 5.25 GHz with radio frequency （RF） 100 MHz bandwidth. It is found that the dynamic ranges, peak powers and noise floors of the IRs are with close correlations. The comparisons with different denoising methods are given by deriving the power delay profiles （PDPs）, root mean square （RMS） delay spread （RMS DS）, number of paths （NOPs） and Ricean K-factors. It is concluded that the traditional fixed level noise cut is under estimate of DS and NOPs. The Ricean K-factors are of little sensitive to noise cut irrespective of what kind of methods applied. The PDPs are not very sensitive to the fixed level noise cut, however, obvious changes can be found by dynamic noise cut. The dynamic noise cut is preferred when clear noise floors is observed and decided from the measured IRs, it＇s of importance in data post processing for wideband radio channel measurements as well as the relevant modeling work.

关键词： impulse response wideband channel denoising channel parameter channel measurement

Analyses of Virtual MIMO Multi-User System Performance with Linear Precoding Schemes Using Indoor Measurements at 5 GHz

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Communications and Network 2023年第1期15卷 15-24页

作者： Balla moussa coulibaly Department of Computer Sciences University of Law and Political Sciences of Bamako Bamako Mali

In this paper, based on 5 GHz indoor multi-user measurements, linear precoding schemes such as zero-forcing (ZF), minimum mean square error (MMSE) and successive interference cancelation (SIC) are applied in the base station in order to investigate the performance of virtual multi-input multi-output (MIMO) over single-user MIMO system. However, to form a virtual MIMO multi-user system, the resources of two users are brought together. In order to achieve a low spatial correlation, two spaced antennas in the MS have been chosen and four spaced antennas elements in BS have been selected. Therefore, the resources of two users (U1 and U2) are brought together to form a 4 × 4 virtual MIMO multi-user system with the BS. The properties of the user_1 (U1) and user_2 (U2) will be analyzed and compared to those properties of virtual MIMO multi-user system formed by U1 and U2. In most cases, the maximum achievable rate is seen with virtual MIMO multi-user compared to single-user MIMO. So virtual MIMO multi-user is desirable for boosting system capacity than single-user MIMO. .

关键词： Virtual MIMO Capacity ZF MMSE SIC

Giant Tuberculomas Suggesting a Malignant Brain Tumor: About Two Cases

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Open Journal of Modern Neurosurgery 2024年第4期14卷 239-245页

作者： Drissa Kanikomo moussa Diallo André Jacques Tokpa Youssouf Sogoba Izoudine Blaise Koumaré Julienne Mouani Boubacar Sogoba oumar Diallo oumar coulibaly Mamady coulibaly Souleymane Kanikomo Department of Neurosurgery Gabriel Tour Teaching Hospital Bamako Mali Department of Neurosurgery Bouak Teaching Hospital Bouak Cote dIvoire Department of Neurosurgery Teaching Hospital Hpital du Mali Bamako Mali

Tuberculoma is a common condition in developing countries. In some cases, it may mimic a glial lesion, making differential diagnosis challenging. The authors report two cases of giant tuberculoma in young patients aged 14 and 16. A literature review was conducted on these cases. Both patients underwent partial excision. Histology concluded tuberculoma. Anti-tubercular treatment was implemented. The evolution one year later was marked by the persistence of neurological disorders, although they had improved.

关键词： Giant Tuberculoma Malignant Tumor Glioma Intracranial

A Case Report of 3C Syndrome and Literature Review

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Case Reports in Clinical Medicine 2022年第1期11卷 8-12页

作者： Drissa Kanikomo Youssouf Sogoba moussa Diallo Mamadou Salia Diarra oumar coulibaly Boubacar Sogoba Mahamadou Dama Mamady coulibaly Mamadou Diallo Department of Neurosurgery Gabriel Touré Teaching Hospital Bamako Mali Department of Neurosurgery Luxembourg Hospital Bamako Mali Department of Neurosurgery H&ocirc pital du Mali Bamako Mali

Ritscher-Schinzel syndrome, or 3C (cranio-cerebello-cardiac) syndrome is a developmental disorder characterized by cranio-facial, cerebellar and cardiac anomalies. It is a rare disease with an incidence of 1/1,000,000 inhabitants, and was first described by Ritscher-Schinzel in 1987. 3C syndrome is an autosomal recessive disease caused by a mutation on the long arm of chromosome 8 to 8q24.13, the KIAA0196 locus, the strumpellin protein gene. The cardiac and cerebral anomalies are most often leading cause of death at an early age and people with 3C syndrome rarely exceed 40 years. In this paper, we report a case of Ritscher-Schinzel in 3-month-old boy who was admitted to our neurosurgical department in September 2020. Clinical examination revealed a macrocrania with head circumference at 47 cm. There was a prominence of forehead and occiput, the root of the nose which was flat, hypertelorism and micrognatism. The CT scan revealed Dandy WALKER malformation with cystic dilation of the 4th ventricle, an aplasia of the cerebellar vermis associated with a tretraventricular hydrocephalus.

关键词： Cardiac Anomalies Ritscher-Schinzel Syndrome 3C

Intracranial Calcified Extradural Hematoma about a Case

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Open Journal of Modern Neurosurgery 2023年第2期13卷 69-73页

作者： Drissa Kanikomo moussa Diallo André Tokpa Youssouf Sogoba Izoudine Blaise Koumaré Mamadou Salia Diarra Boubacar Sogoba oumar Diallo Mahamadou Dama oumar coulibaly Mamady coulibaly Abdoulaye Kanikomo Department of Neurosurgery Teaching Hospital Gabriel Toure Bamako Mali Department of Neurosurgery Teaching Hospital of Bouake Bouake Cote d’Ivoire Department of Neurosurgery Luxembourg Hospital of Bamako Bamako Mali Department of Neurosurgery Mali Hospital Bamako Mali

Introduction: Extradural hematoma is a common pathology in our department. The natural history of small-volume hematoma is usually towards resorption. In rare cases, the hematoma calcifies and compresses the brain. We report an extradural hematoma in a 15-year-old boy who had a road traffic accident on February 2011. The brain CT-scan performed the following day revealed a small right frontal extradural hematoma. During hospitalization, he had a fever of 40 degrees with convulsions and the blood culture isolated the coagulase-negative staphylococci and Group D streptococci. When his conscience was restored, hemiparesis and dysarthria were observed. The control brain CT-scan performed 2 weeks after the trauma showed early resorption of the hematoma. Two months after the trauma, the brain CT-scan showed calcification of the hematoma. He underwent surgery in April 2011 to remove the calcification. The sequels were hemiparesis and posttraumatic epilepsy. Conclusion: The evolution of a small non-operated extradural hematoma can be done towards calcification thus requiring surgery.

关键词： Extradural Hematoma Calcification

A Case Report of an Invasive Scalp Actinomycosis

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Case Reports in Clinical Medicine 2021年第2期10卷 34-38页

作者： Youssouf Sogoba Jean Paul Dembele Boubacar Sogoba moussa Diallo Seybou Hassane Diallo oumar coulibaly Quenum Kisito oumar Diallo Drissa Kanikomo Youssoufa Maiga Department of Neurosurgery H&ocirc pital Gabriel Touré Bamako Mali Department of Infectious Diseases H&ocirc pital du Point G Bamako Mali Department of Neurologie H&ocirc pital Gabriel Touré Bamako Mali Department of Neurosurgery H&ocirc pital du Mali Bamako Mali Department of Neurosurgery University Hospital of Parakou Parakou Benin

Background: Actinomycosis is a bacterial infection characterized by a chronic, suppurative and granulomatous process. The causative organism was identified in 1891 as Actinomycosis israelii. The disease is usually caused by the introduction of the bacteria through minor wound. Actinomycosis was classified by Cope into 3 different forms: cervicofacial (50%), pulmonothoracic (30%) and abdominopelvic (20%). Actinomycosis is an insidious disease but occasionally the clinical course can be more aggressive, involving underline tissue and organs. Involvement of scalp by actinomycosis is rare causing diagnostic dilemma and could be mistaken for different pathologies, such as tuberculosis or carcinoma. The most common clinical findings are local tumefaction with abscesses and sinuses draining pus that contains the granule of the causative organism. CT scan and MRI are aspecific for diagnosis, but they can help in defining the localization and the extension of the lesion. The certain diagnostic is based on cytology and/or biopsy. Case: A 24 year-old-man was admitted to our neurosurgical department with a 16-month history of multiple scalp ulcerated lesions and swelling of the head. He was complaining of headache. Physical examination revealed multiple scalp subcutaneous nodules and ulcerated lesions with swelling of the head. Our examination of the oral cavity revealed a poor oral hygiene condition with multiple caries. The CT scan revealed multiple scalp subcutaneous masses with chronic inflammatory changes of the skull. Routine laboratory test was normal. Surgical biopsy was performed and the histological result was compatible with actinomycosis. After histological confirmation, parenteral Penicillin 20 million units daily were given for 4 weeks. Clinical improvement was observed after completing a 4-week regimen of intravenous antibiotics. Conclusion: Involvement of scalp by actinomycosis could be mistaken for dif

关键词： Actinomycosis Bacterial Infection Computed Tomography

Surgical Repair of Growing Skull Fracture: A Case Report

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Case Reports in Clinical Medicine 2022年第3期11卷 79-83页

作者： Youssouf Sogoba Seybou Hassane Diallo moussa Diallo Drissa Kanikomo Boubacar Sogoba oumar coulibaly Mahamadou Dama Mamadou Salia Diarra oumar Diallo Youssoufa Maiga Department of Neurosurgery Gabriel Touré Teaching Hospital Bamako Mali Department of Neurology Gabriel Touré Teaching Hospital Bamako Mali Department of Neurosurgery H&ocirc pital du Mali Bamako Mali Department of Neurosurgery H&ocirc pital Luxambourg Bamako Mali

Background: Growing skull fractures (GSF) are a rare complication of pediatric head trauma that comprises post-traumatic skull defect associated with an underlying dural tear and an intact arachnoid membrane. They are often misdiagnosed, and delay in management can lead to progression of the disease with neurological sequelae. GSF are rare and their incidence has been estimated as 0.05% - 1% of all pediatric skull fractures. This low incidence and the subtlety of its presentation often make diagnosis challenging with consequent delay in management. Surgery is recommended to treat GSF and involved dural repair with or without cranioplasty. In this paper, we report a case of a patient with GSF in whom the surgical repair was successful with good cosmetic and functional outcome. Case Report: A 12 months old girl was admitted to our neurosurgical department with right parietal swelling that had been gradually enlarging over 3 months. The history of the disease began when the girl was 1 month old with a fall with cranial impact resulting in head trauma with initial loss of consciousness. At presentation the girl was alert with normal consciousness. Clinical examination revealed the deformed skull with large pulsatile and painless swelling lesion in the right parietal region and hemiparesis on the left side. The CT scan revealed type 3 GSF including parietal bone diastasis with hypodense fluid collection that mimicked the leptomeningeal and porencephalic cyst. Surgical repair was performed. The post-operative course was uneventful and the child was discharged home five days after surgical intervention. Conclusion: GSF can lead to serious neurologic complications. Therefore educating parents on this potential outcome and close follow-up with clinical and imaging screening is recommended to screen children at risk for the development of the disease.

关键词： Growing Skull Fracture Head Trauma Dural Tear

Feasibility of Scanopelvimetry in the Medical Imaging Department of the University Hospital of Point “G”.

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Open Journal of Medical Imaging 2022年第3期12卷 157-164页

作者： Abdoulaye Koné moussa Konaté Youssouf Koné moussa Traore Youssouf Diawara Ibrahima coulibaly Ouncoumba Diarra Fatoumata Kalapo Amadou Doumbia Kassim Sidibe Cheick oumar Touré oumar Aba Ata Mody A. Camara Mamadou Sima coulibaly Salia Mahamadou Diallo Adama Diaman Keita Siaka Sidibé Faculty of Medicine and Odontostomatology Bamako Mali Medical Imaging Department of the University Hospital of Point G Bamako Mali Radiology Department of the Jacques Boutard Hospital Saint-Yrieix-la-Perche France Medical Imaging Department of GABRIEL TOURE Hospital Bamako Mali Radiology Department of CSREF Commune III Bamako Mali Medical Imaging Service Health Center of Ref Commune VI Bamako Mali DCSSA Kati Mali Medical Imaging Service Health Center of Ref Commune IV Bamako Mali Medical Imaging Service of the Mali Hospital Bamako Mali. Surgery of Gynecology-Obstetrics CHU Point G Bamako Mali Medical Imaging Department CHU BSS Kati Mali

Purpose: The purpose of our study was to describe the technique of scanopelvimetry used in the radiology department of the Point G University Hospital, to specify the indications of scanopelvimetry in the department and to evaluate the cost of radiopelvimetry. Patients and Method: This was a prospective, cross-sectional study that took place over a 12-month period from January 1 to December 31, 2018. It focused on pregnant women in whom scanopelvimetry was performed in the medical imaging department of Point G University Hospital during the study period. Results: Out of 8615 CT examinations performed in the radiology department, we collected 65 cases of scanopelvimetry, i.e., 0.7% of the CT examinations. Primigravida and paucigravida dominated the study (40% each). In 60% of the pregnant women the height was less than 150 cm. The most frequent indication for CT scanning was clinical pelvic narrowing (50%). In 80% of the cases, the scanopelvimetry was performed after 37 weeks of amenorrhea. A predominance of narrowing of the superior strait was noted (40%). 4.6% of the pregnant women had a Magnin index of less than 20. CT scanopelvimetry is a feasible examination in our context but the level of demand is low because of the high cost of the examination (49500 fca). Conclusion: In light of the results obtained, we can say that CT pelvimetry allows us to predict the probable route of delivery and thus we can reduce the risk of fetomaternal morbidity and mortality to improve maternal and child health.

关键词： Scanopelvimetry Prognosis Magnin Index Delivery

Assessment of Rapid Diagnostic Tests Algorithms in Transfusion Medicine Setting

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Advances in Biological Chemistry 2021年第1期11卷 52-63页

作者： Modibo coulibaly Bakary Maiga Dramane Samaké moussa Diawara Mahamadou Traoré Valentin Sagara Bréhima Traoré oumar Guindo Amagana Dolo Department of Biomedical Laboratory Sominé DOLO Hospital Mopti Mali Department of Research and Training National Center for Transfusion Bamako Mali Faculty of Medicine and Odonto-Stomatology University of Sciences Techniques and Technologies Bamako Mali Department of Medicine Sominé DOLO Hospital Mopti Mali Department of Public Health Sominé DOLO Hospital Mopti Mali Faculty of Pharmacy University of Sciences Techniques and Technologies Bamako Mali

Background: The rapid diagnostic tests play a pivotal role in the screening of viral markers in blood qualification for transfusion in limited resource setting. Therefore, it is important to assess their analytical performances to ensure their proper functioning. Material and Methods: We performed a cross- sectional study by successive recruitment to assess the diagnostic value of rapid diagnostic tests algorithms using ELISA as a reference test. A total of 661 blood from donors were enrolled for this study. Rapid Diagnostic Tests (RDTs) and ELISA tests were performed for each sample by a couple of double-blinded biotechnologists. Data were collected on case report form and captured in Microsoft Excel then the file was imported and analyzed using R software version 4.0.3. Results: The diagnostic accuracy for the algorithms are summarized in Table 1. For HIV-algorithm, the internal validity parameters were as follow: sensitivity (sens) 99.0% (95% CI = 97.8, 99.5);specificity (spec) 98.3% (95% CI = 90.9, 99.7);positive likelihood ratio (PLR) 57.4 (95% CI = 8

关键词： Rapid Diagnostic Tests Analytical Performances Assessment Transfusion Medicine