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Design of an Interconnection Architecture and Sizing of Two (2) EPC Core Networks: The Case of Orange-Guinea

Journal of Energy and Power Engineering 2024年第2期18卷 59-70页

作者： Mamadou Sadigou Diallo Kadiatou Aissatou Barry amadou Lamarana bah Mamadou Sanoussy Camara Janvier Fotsing amadou Barry amadou oury bah Gamal Abdel Nasser University of Conakry(UGANC) P.O.BOX 1147Conakry 001BP 1147Republic of Guinea National Advanced School of Engineering University of Yaoundé1Yaoundé1001BP 337Republic of Cameroon

With the arrival of the 4G and 5G,the telecommunications networks have experienced a large expansion of these *** enabled the integration of many services and adequate flow,thus enabling the operators to respond to the growing demand of *** rapid evolution has given the operators to adapt,their methods to the new technologies that *** complexity becomes more important,when these networks include several technologies to access different from the heterogeneous network like in the 4G *** dimensional new challenges tell the application and the considerable increase in demand for services and the compatibility with existing networks,the management of mobility intercellular of users and it offers a better quality of ***,the proposed solution to meet these new requirements is the sizing of the EPC(Evolved Packet Core)core network to support the 5G access *** the case of Orange Guinea,this involves setting up an architecture for interconnecting the core networks of Sonfonia and *** objectives of our work are of two orders:(1)to propose these solutions and recommendations for the heart network EPC sizing and the deployment to be adopted;(2)supply and architectural interconnection in the heart network EPC and an existing heart *** our work,the model of traffic in communication that we use to calculate the traffic generated with each technology has link in the network of the heart.

关键词： 5G network 4G network(EPS(evolved packet system)) 3G network(UMTS:Universal Mobile Telecommunications System) EPC network of the heart architecture dimensional Orange Guinea technology service

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Surgical Treatment of Upper Urinary Tract Lithiasis in Conakry

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Open Journal of Urology 2024年第9期14卷 487-498页

作者： Barry Mamadou Madiou Diallo Thierno Oumar Sow Thierno amadou oury Diallo Thierno Mamadou oury bah Ibrahima bah Mamadou Diao Cissé Demba bah Oumar Raphiou Service dUrologie Hpital National Ignace Deen Universit Gamal Abdel Nasser de Conakry Conakry Guinea

Introduction: The management of urinary lithiasis in our settings has long been conventional surgery. The recent introduction of endoscopy of the upper urinary tract represents a major advance in our department. The aim was to contribute to the study of the treatment of lithiasis of the upper urinary tract in Conakry and to report on our initial experience of ureteroscopy in Conakry. Methodology: This is a prospective descriptive study lasting one year, from January 1 to December 31, 2022, carried out at the Urology Department of the Ignace Deen National Hospital and at the PERCHIN Urological Clinic. The study included all patients treated surgically for lithiasis of the upper urinary tract who met the selection criteria. Results: The study included 57 patients. The mean age was 30 years, with extremes of 20 and 73 years;the most represented age group was 31 to 40 years, followed by 20 to 30 years with 29.9% and 26.3% respectively. Males predominated in 36 cases (63.15%), with a M/F sex ratio of 1.71. Left-sided renal colic was the most common, at 75.43% (n=43), and right-sided renal colic at 40.35%, associated with digestive signs at 43.85%. 77.19% had normal creatinine levels before surgery, versus 22.81% with elevated creatinine levels, i.e. 15.78% improvement in renal function after surgery. Urinary tract infection was found in 47.36%, and Escherichia coli in 31.57%, followed by staphylococcus aureus in 8.77%. Overall, 82.45% of patients had organic damage to the kidneys or ureters. Right ureterohydronephrosis was noted in 56.14%, followed by left hydronephrosis in 26.32%. Open surgery was predominant in 52.63% of cases, with endoscopic surgery (URS) accounting for a significant 47.36% during the study period. The endoscopic treatment used was laser ureteroscopy. In our study, 73.68% underwent drainage of the upper excretory tract, including 64.91% with a JJ catheter. The average length of stay was 07 days, with extremes of 02 and 28 days, and 81.4% of patients

关键词： Urinary Lithiasis Surgical Treatment Ureteroscopy Upper Urinary Tract Conakry

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Wind Potential Modeling at Kanfarandé Site in the Republic of Guinea

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Journal of Power and Energy Engineering 2024年第9期12卷 50-62页

作者： Nènè Aïssata Baldé Oumar Keita amadou Lamarana bah Tamba Nicolas Millimono Department of Energy Institute Suprieur de Technologie de Mamou Mamou Guinea Department of Hydrology Universit de NZrkor Nzrkor Guinea Teaching and Research Laboratory in Applied Energy Universit Gamal Abdel Nasser de Conakry Conakry Guinea

The purpose of this work is to assess wind potential on the Kanfarandé site (Guinea). The data used for this research covers a period of 6 years (2018 to 2023) and consists of in situ data (Boké meteorological station) and satellite products via NASA Power Larc. The study is based on sorted hourly data (speed and direction). The treatments focus on the monthly, annual and seasonal average of speeds, by sector and their frequencies as well as the annual available powers. The obtained results made it possible, on the one hand, to assess wind potential and, on the other hand, to highlight the most favorable periods for wind energy exploitation. The analyzes show the months of July and August have the best average wind speeds with 5.01 m/s and 5.34 m/s respectively. Average wind speeds are higher during the day than at night with a peak observed at 6 p.m. The study also shows that the prevailing winds are oriented towards the South-West. The Weibull parameters determined for the site give an average of 4.5 m/s for the scale parameter and for the shape parameter 2.40 corresponding to an average power density of 65 w/m2 with an annual available power of 194.80 W/m2 and an annual available energy of 1706.45 kWh/m2.

关键词： Wind Potential Modeling Weibull Distribution Wind Rose Power Density Available Power Guinea

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Evaluating the Influence of the Prostate Weight on the Morbidity and Mortality of Transvesical Open Prostatectomy: Prospective Analysis of 108 Cases in the Urology-Andrology Department of the Ignace Deen National Hospital in Conakry

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Open Journal of Urology 2024年第4期14卷 252-261页

作者： Thierno Oumar Diallo Alimou Diallo Alpha Oumar Barry Thierno Mamadou oury Diallo Alseny bah Youssouf Keita Daouda Kanté Mamadou Bissiriou bah Demba Cissé Ibrahima bah Abdoulaye Bobo Diallo Oumar Raphiou bah Urology Department National Hospital of Ignace Deen Conakry University Conakry Guinea Urology Department Sino-Guinean Friendship Hospital Conakry University Conakry Guinea

Introduction: Open transvesical prostatectomy remains today one of the most effective approaches for the management of benign prostatic hyperplasia despite the fact that, this method is associated with multiple complications. The objective of this study was to evaluate the influence of prostate weight on the morbidity and mortality of transvesical prostatectomy for adenoma in the urology-andrology department of the Ignace Deen National Hospital. Materials and Methods: This was a prospective, longitudinal and analytical study lasting 6 months, from March 1, 2022 to August 31, 2022 including patients admitted and operated on by open transvesical prostatectomy by assessing the influence of prostate weight on the morbidity and mortality of transvesical adenomectomies. Results: 108 patients were included in our study, the average age of our patients was 70 ± 7.7 years, cultivators were the most represented profession with 38.89%, and hypertension was the most represented comorbidity with 75%. 33.06% of cases became complicated and surgical wound infection was the main complication with a frequency of 17.40%. Statistical analysis did not conclude that, the prostate weight does not have a statistically significant influence on the morbidity and mortality of transvesical open prostatectomy for benign prostatic hyperplasia. Conclusion: Prostate weight has no influence on the morbidity and mortality of transvesical prostate adenoma.

关键词： Benign Prostatic Hyperplasia (BPH) Adenomectomy Prostate Weight Complication

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Assessment of Upper Guinea’s Wind Energy Potential with a View to Identifying Exploitable Sites

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Journal of Energy and Power Engineering 2024年第1期18卷 9-17页

作者： Nènè Aïssata Baldé amadou Lamarana bah Idrissa Diaby Cellou Kanté Adama Moussa Sakho Department of Energy Science Higher Institute of Technology of MamouMamou BP 063Mamou Republic of Guinea Teaching and Research Laboratory in Applied Energy Gamal Abdel Nasser University of ConakryConakry BP 1147Republic of Guinea Technical Laboratory Department Higher Institute of TechnologyMamou BP 063Mamou Republic of Guinea

As part of the national strategy to further develop the wind energy sector,the eight prefectures of Upper Guinea have been *** meteorological data recorded over thirty years(1991-2021)at a height of 20 m,we assessed wind resources in terms of characteristic speeds,power and available *** this end,the Weibull distribution method was used and the following values were obtained:3.66 m/s for the average speed;1,102.83 W/m^(2)for the available power and 8,747.06 kWh/m^(2)/year for the annual available energy.

关键词： Wind energy Weibull distribution high Guinea

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Causes and Prognosis of Cases of Acute Obstructive Renal Failure Managed at the Donka National Hemodialysis Center

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Open Journal of Nephrology 2024年第2期14卷 136-146页

作者： amadou Yaya Diallo Mamadou Mouctar Diallo Mamadou Dian Barry Kadiatou Mamadou Bobo Barry Saikou Oumar Diallo Djenabou Diallo Soriba Bangoura Mamadou Malal Diallo Thierno Mamadou oury Diallo Mohamed Lamine Kaba Alpha Oumar bah Department of Nephrology-Hemodialysis CHU Donka Conakry Guinea Faculty of Health Sciences and Techniques Gamal Abdel Nasser University of the Republic of Guinea Conakry Guinea Department of Urology-Andrology CHU Ignace Deen Conakry Guinea

Introduction: Acute obstructive renal failure (AORF) is a frequent clinical situation, secondary to obstruction of the urinary excretory tract. Whatever the cause, urinary tract obstruction suddenly opposes glomerular filtration and is responsible for tubulointerstitial lesions. It accounts for 10% of acute renal failure (ARF). The aim of this study was to identify the causes and prognosis of cases of acute obstructive renal failure managed at the Centre National d’hémodialyse Donka. Material and Methods: This was a prospective descriptive study lasting 6 months, from September 1, 2022 to February 29, 2023. All patients undergoing haemodialysis for acute obstructive renal failure who agreed to participate in the study and whose medical records were complete were included. Results: During the course of the study, we registered 97 haemodialysis patients, including 20 cases (20.62%) of acute obstructive renal failure. The mean age of the patients was 57.8 ± 10.54 years, with a male predominance of 11 cases (55%) and a sex ratio of 1.22. The reasons for consultation were dominated by physical asthenia 11 cases (55%), lumbar pain 9 cases (50%), vomiting 6 cases (30%) and acute urine retention 6 cases (30%). Arterial hypertension 16 cases (80%) and urinary tract infection 10 cases (50%) were the most common antecedents. The etiologies of RAOI were dominated by lithiasis 10 cases (50%), neoplasia 6 cases (30%) and benign prostatic hypertrophy 3 cases (15%). mean creatinine was 1267.60 ± 710.76 μmol/l with extremes of 243 μmol/l and 2822 μmol/l, mean urea was 39.56 ± 18.36, hyperkalemia in 14 cases (70%) and hyponatremia in 8 cases (40%). After hemodialysis, 9 cases (45%) recovered renal function, 4 cases (20%) became chronic and 7 cases (35%) died. Conclusion: The frequency of AKI remains non-negligible in our department, and early detection and prompt management would considerably reduce the morbidity and mortality associated with this pathology.

关键词： Acute Obstructive Renal Failure Hemodialysis Prognosis Donka

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Congenital Heart Disease Referred for Surgery: Analysis and Epidemiological Description in the Cardiology Department of CHU Ignace Deen

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World Journal of Cardiovascular Diseases 2024年第4期14卷 234-251页

作者： bah Mamadou Bassirou Diallo Mamadou Tahirou Doumbouya amadou Dioulde Balde Elhadj Yaya Camara Abdoulaye Diallo Mamadou Balde Thierno Siradio bah Abdoulaye bah Mamadou Dian Samoura Sana Balde Mamadou Dadhi Cardiology Department of the Ignace Deen Hospital Conakry Guinea

Introduction: Congenital heart disease includes all cardiac and vascular malformations. It accounts for approximately one third of all congenital malformations and is a public health problem, particularly in developing countries. The aim of this study was to analyze the epidemiological, clinical and paraclinical aspects of congenital heart disease. Methods: This was a retrospective descriptive and analytical study based on the records of 135 patients referred for surgery and followed up in the cardiology department of the Ignace Deen University Hospital, collected in November 2022. Results: Hospital prevalence was 5%. The mean age was 71 months, ranging from 1 month to 19 years. The age group over 24 months was the most represented (62%). The M/F sex ratio was 1.36. Urban origin was predominant (58%). The rate of children not attending school or dropping out was high (16%). Siblings with fewer than 4 children were the most common (88%). A heart murmur was the most frequent sign (78%), followed by cyanosis (36%) and heart failure (29%). The association between heart murmurs and CHD was proven with a p-value Conclusion: CHDs represent the main indication for paediatric cardiac surgery and follow-up (95%). We stress the importance of implementing a screening and management strategy for congenital heart disease.

关键词： Congenital Heart Disease Cardiology Epidemiology Surgery Ignace Deen University Hospital

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Prostatic Adenomectomy and Comorbidities: Frequency and Management at the Urology Department of the Ignace Deen National Hospital in Conakry

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Open Journal of Urology 2024年第4期14卷 217-226页

作者： Demba Cisse Alpha Oumar Barry Morlaye Fatoumata Bangoura Alimou Diallo Mamadou Dian bah Youssouf Keita Daouda Kanté Thierno Mamadou oury Diallo Mamadou Bissiriou bah Mamadou Diawo bah Abdoulaye Bobo Diallo Oumar Raphiou bah Maitre-Assistant à la Facult&#233 des Sciences et Techniques de la Sant&#233 Universit&#233 Gamal Abdel Nasser de Conakry Conakry Guin&#233e

Goal: To determine the type of comorbidity and highlight the complications of adenomectomy and comorbidities. Material and Methods: This is a prospective, descriptive, cross-sectional study lasting six (6) months, from July 1, 2022 to December 31, 2022. Patients with BPH on comorbidity condition taken care of during the study period AND have agreed to participate in the study. Results: During our study, 49 cases of benign prostatic hypertrophy with comorbidities were collected, representing a frequency of 29%. The average age ranges for the patients were 43 - 70 years. The age group most affected was 70 to 79 years old (38.80%). Nocturnal urinary frequency was the main reason for consultation present in all our patients. The most frequent comorbidity was hypertension, i.e. 83.70%. The PSA rate between 4 and 10 was the most represented, i.e. 42.86%. The prostate volume was between 61 and 100 ml in 40.82% of patients. Histology showed that it was a benign adenomatous hypertrophy of the prostate in 85.70% and a prostatic adenomyoma in 14.29%. Trans-bladder adenomectomy alone was the most performed technique, i.e. 49%, followed by trans urethral resection of the prostate, i.e. 38.80%. Retention of urine after removal of the catheter was the most observed complication, i.e. 12.20%. Conclusion: Benign prostatic hypertrophy with comorbidities constitutes a frequent association. Because their presence can affect effectiveness and lead to complications.

关键词： Prostatic Hypertrophy Comorbidities Conakry University Hospital

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Comparative Study of Transvesical and Retropubic Prostatic Adenomectomies in the Urology-Andrology Department of Ignace Deen University Hospital Center

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Open Journal of Urology 2024年第4期14卷 227-243页

作者： Lahoumbo Ricardo Gnammi Demba Cissé Vahina Alexandre Gamamou Daouda Kanté Mamadou Diawo bah El-Mouksitou Akinocho Sabi Couscous Hassiatou Abdul-Haqq bah-L’Imam Thierno Oumar Diallo Thierno Mamadou oury Diallo Ibrahima bah Abdoulaye Bobo Diallo Oumar Raphiou bah Department of Urology-Andrology Ignace Deen UHC Conakry Republic of Guinea School of Public Health Free University of Brussels Brussels Belgium Medical Imaging Department Ambroise Pare Clinic Conakry Guinea

Objective: To compare the results of transvesical and retropubic prostatic adenomectomies at the Urology-Andrology Department of Conakry University Hospital. Methodology: This was a prospective multi-operator analytical study lasting 6 months. It included 70 patients operated on for benign prostatic hypertrophy (BPH), divided into 2 groups of 35 according to the retropubic or transvesical technique. The data was collected using a questionnaire and entered into the Epi info application. The analysis was initially descriptive and then univariate. To identify confounding factors, a multivariate analysis was performed. The application conditions of each test were checked before their application. A p-value Results: Upper adenomectomies represented 53.6% of surgeries performed for BPH. The average age was 73.2 years. The mean prostate volume was 117 ± 51.6 cc and the mean total PSA was 9.2 ± 11.4 ng/ml. The majority of patients had an ASA1 (60%) and ASA2 (37.1%) score. Spinal anesthesia, a double-current silicone probe with hinged hinge 22, and drainage of the prevesical space were carried out in all patients, i.e. 100%. The average overall blood loss was 229 ± 98.2 ml. It was lower in the group of patients operated via the retropubic route (187 ± 60.4 ml). The same was true for the duration of intervention (49.1 ± 7.17 vs 55.4 ± 7.9 min), the catheter wearing time (5.14 ± 0.97 vs 9.29 ± 2 .9 days) and the length of hospitalization (=6.26 ± 1.15 vs 12.1 ± 5.74 days). Conclusion: The retropubic technique has advantages over the transvesical one. These advantages are translated by a gain in the duration of the intervention, blood loss, catheter wearing time and length of hospitalization.

关键词： Upper Adenomectomies BPH Retropubic Approach Transvesical Approach Conakry

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Isolated Ventricular Septal Defect: Ultrasound, Therapeutic and Evolutionary Aspects of 85 Cases in the Cardiology Department of the Ignace Deen National Hospital in Conakry

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World Journal of Cardiovascular Diseases 2024年第8期14卷 465-479页

作者： Mamadou Bassirou bah amadou Diouldé Doumbouya Elhdj Yaya Balde Mamadou Aliou Balde Alpha Kone Ibrahima Sory Sylla Mamadou Dian bah Aboulaye bah Mamadou Diallo Thierno Siradjo Balde Abdoulaye Camara Morlaye Soumaoro Ibrahima Sory Barry Souleymane Diakité Mamadou Dadhi Balde Cardiology Department of the Ignace Deen Hospital Conakry Guinea Cardiology Department Donka Hospital Conakry Guinea

Introduction: Ventricular septal defect (VSD) is the most common congenital heart disease of all congenital heart defects. The aim of this study was to investigate the echographic, therapeutic and evolutionary aspects of ventricular septal defects (VSD) in the general cardiology department of the Hôpital National Ignace Deen. Methods: A retrospective data collection was carried out from January 2018 to December 2023 including 85 cases of isolated IVC was performed. The variables studied were epidemiological, clinical, paraclinical, therapeutic and evolutionary. Results: Of the 320 patients seen during the study period for congenital heart disease, 85 (26.556%) were isolated IVCs. Age at diagnosis ranged from 3 months to 16 years, with an average age of 3.59 years. The most represented ethnic group was the Fulani (50.58%). The 8.24% came from consanguineous marriage versus 22.35%. 91.76% of children had a history of bronchitis. The most common clinical signs found were systolic murmur (90.58%), growth retardation (51.76%). Only 4 cases (4.70%) had a malformation associated with IVC represented by DiGeorges disease (2.35%) and trisomy 21 (2.35%). Nearly half the patients had type IIb VIC (44.71%). The other half were represented by type 1 (18.82%), type IIa (20%), type III (10.59%) and type IV (5.88%). According to site more than two-thirds of VICs (71.64%) were perimembranous in location, followed by infundibular (16.47%) and muscular (11.76%) VICs. In our study 55.29% presented an indication for both surgical intervention and medical treatment, while 16.47% required only medical treatment. In contrast, 28.23% were placed under exclusive surveillance. Of the 47 patients for whom surgery was indicated, 29 (61.17%) underwent surgical repair, while 18 (38.83%) were awaiting confirmation for surgery. Conclusion: VIC is the most common congenital heart disease. An early detection strategy and the establishment of specialized centers could improve the outcome of these chil

关键词： Ventricular Septal Defect Congenital Heart Disease Ignace Deen

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