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CrowdOLA： Online Aggregation on Duplicate Data Powered by Crowdsourcing

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Journal of Computer Science & Technology 2018年第2期33卷 366-379页

作者： An-Zhen Zhang Jian-Zhong Li Hong Gao Yu-Biao Chen Heng-Zhao Ma mohamed Jaward bah School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China

Recently there is an increasing need for interactive human-driven analysis on large volumes of data. Online aggregation （OLA）, which provides a quick sketch of massive data before a long wait of the final accurate query result, has drawn significant research attention. However, the direct processing of OLA on duplicate data will lead to incorrect query answers, since sampling from duplicate records leads to an over representation of the duplicate data in the sample. This violates the prerequisite of uniform distributions in most statistical theories. In this paper, we propose CrowdOLA, a novel framework for integrating online aggregation processing with deduplication. Instead of cleaning the whole dataset, Crow~ dOLA retrieves block-level samples continuously from the dataset, and employs a crowd-based entity resolution approach to detect duplicates in the sample in a pay-as-you-go fashion. After cleaning the sample, an unbiased estimator is provided to address the error bias that is introduced by the duplication. We evaluate CrowdOLA on both real-world and synthetic workloads. Experimental results show that CrowdOLA provides a good balance between efficiency and accuracy.

关键词： online aggregation entity resolution crowdsourcing cloud computing

Phenotypic diversity of wild Sierra Leonean coffee(Coffea stenophylla)collected from Kenema and Moyamba districts

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Beverage Plant Research 2023年第1期3卷 101-108页

作者： Paul Musa Lahai Peter Osobase Aikpokpodion mohamed Tailu Lahai mohamed Alieu bah Mathew Lamana Saffa Gboku Sierra Leone Agricultural Research Institute(SLARI) IDAKenema 42215Sierra Leone Department of Genetics and Biotechnology Faculty of Biological Sciences University of CalabarPMB 1115 CalabarCross River State 540271Nigeria Department of Crops Science Faculty of AgricultureNjala UniversityMokonde 42215Sierra Leone Sierra Leone Agricultural Research Institute(SLARI) Tower HillFreetown 42215Sierra Leone

Coffee is a major cash and export crop in Sierra Leone and is mainly cultivated in southern and eastern ***,Kailahun,Moyamba,Bo,Pujehun and Kono are major coffee growing districts in the *** study looks at the extent of phenotypic diversity of the rare and wild Coffea stenophylla in Kenema and Moyamba *** Shannon-Weaver diversity index(H')revealed variations among the samples for the observed 13 morphological traits which ranges from 0 for both fruit colour and calyx limb persistence to 0.87 for angle of insertion of primary branches on the main *** the 13 morphological traits assessed,angle of insertion of primary branches on main stem(0.87),growth habit(0.78),bean size(0.75),young leaf colour(0.66),stem habit(0.66)and fruit shape(0.65)exhibited high level of diversity while seed shape(0.58),stipule shape(0.46),leaf shape(0.43),seed uniformity(0.31)and leaf apex shape(0.06)showed low levels of *** is the first report of phenotypic diversity of *** in Sierra Leone and the study thus unraveled existence of diversity among *** is recommended that these observed variabilities be exploited in order to develop better accessions that are high yielding yet maintain the same ***,genetic fingerprinting needs to be applied to provide a complementary assessment of the observed phenotypic diversity.

关键词： district insertion yielding

Genetic diversity of coffee germplasm in Sierra Leone:implications for conservation and breeding programs

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Beverage Plant Research 2023年第1期3卷 240-248页

作者： Paul Musa Lahai mohamed Alieu bah mohamed Tailu Lahai Peter Osobase Aikpokpodion Raymonda Adeline Bernadette Johnson Sierra Leone Agricultural Research Institute(SLARI) IDAKenema 42215Sierra Leone Njala University Mokonde 42215Sierra Leone Eastern Technical University Combema RoadKenema 42215Sierra Leone University of Calabar Faculty of Biological SciencesDepartment of Genetics and BiotechnologyPMB 1115 CalabarCross River StateNigeria Ministry of Agriculture and Food Security(MAFS) Freetown 42215Sierra Leone

Global coffee production is dominated by Coffea arabica(Arabica coffee)and ***(Robusta coffee)due to their relatively high-yielding and quality attributes as opposed to other coffee *** these advantages,production of Arabica and Robusta coffee is facing mounting challenges though not limited to increasing prevalence and severity of biotic and abiotic *** challenges bring forth an indication that the global coffee crop portfolio requires diversification to ensure resilience to the key challenges for sustainable *** Leone is in the center of genetic diversity of genus Coffea,and the country hosts rich coffee genetic *** ***,*** and possibly other wild relative species are indigenous to Sierra Leone and these species offer great potential for a new coffee market and income ***,more efforts of conservation and genetic improvement on these species,are needed to realize these *** objective of this paper is to review the coffee genetic resources in Sierra Leone with an emphasis on the wild coffee species including their conservation status,and the phenotypic and molecular *** also present perspectives for future genetic improvement of ***,and discuss breeding methods,combining ability,and molecular marker-assisted prediction of hybrid ***,with the availability of recently developed single nucleotide polymorphisms(SNP)markers on ***,we suggest that new technologies of molecular breeding,such as genomic selection can significantly accelerate the breeding progress and deliver improved varieties with high yield,good adaptability,and disease resistance.

关键词： income breeding coffee

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微电网中的电源管理

微电网中的电源管理

作者： mohamed Ramadan bah 华北电力大学(北京)

学位级别：硕士

为了向消费者提供高质量和可靠的电力,必须进行电力管理,使得从发电侧,通过变速器然后到配电侧有稳定的电力流动。微电网是传统电网的缩影,也需要适当的电力管理。微电网大多数时间靠近负载中心连接,使用可再生能源,如太阳能光伏板,风... 详细信息

为了向消费者提供高质量和可靠的电力,必须进行电力管理,使得从发电侧,通过变速器然后到配电侧有稳定的电力流动。微电网是传统电网的缩影,也需要适当的电力管理。微电网大多数时间靠近负载中心连接,使用可再生能源,如太阳能光伏板,风力涡轮机,微型涡轮机等。微电网既可以在电网连接模式下运行,也可以在自主模式下运行。因为大多数微电网是使用电子接口分布式发电来操作的,所以它们具有低惯性。因此,需要进行适当的控制,以便在瞬态情况下几乎没有影响。要控制以确保可靠和高质量功率流的组件是实际或有功功率,无功功率,电压和频率。无论负载条件或发电条件如何,在操作微电网时应该减少干扰。应该有足够的有功功率和适当的无功功率补偿。无论何时发生加载,都必然会降低频率。然而,这应该以这样的方式控制,即没有振荡会导致进一步的问题。与具有并联连接的逆变器的微电网相关的另一个问题是流过这些逆变器的循环电流。这种现象的主要影响是功率质量差和可能的热量累积。这种效果肯定是不可取的,需要加以解决。在这项研究中,有两个并联的逆变器。还连接了本地负载以及一般负载。本地负载在不同时间连接,其中一个负载在一段时间后断开。这是为了在装载和卸载期间测量实际功率和无功功率的流量。在此期间也观察到频率。最后,还观察流过逆变器的循环电流,看它足否在可接受的范围内。所有这些都是使用MATLAB Simulink实现的,结果将在此后生成。

关键词：微电网电力管理逆变器循环电流

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复合微胶囊的制备

复合微胶囊的制备

作者： mohamed Gibril bah 天津大学

学位级别：硕士

微胶囊是微小的球体,其形成过程称为微胶囊化,通过在其内部裹覆不同物质材料,实现多功能性及弥补缺陷。微胶囊作为药物的有力载体,因为它能确保核心材料和膜材料迅速到达胃肠道的靶部位。具有独特形态和性质的多功能聚合物微胶囊由于其... 详细信息

微胶囊是微小的球体,其形成过程称为微胶囊化,通过在其内部裹覆不同物质材料,实现多功能性及弥补缺陷。微胶囊作为药物的有力载体,因为它能确保核心材料和膜材料迅速到达胃肠道的靶部位。具有独特形态和性质的多功能聚合物微胶囊由于其双重功能和在不同领域的广泛应用而备受关注。微胶囊在医药和工业应用、药物输送系统、化妆品、食品、纺织品、催化、储能介质、粘合剂和农业工业中具有巨大的潜力。从本质上讲,复合微胶囊的优点取决于它们的分离质量、相当大的内体积、表面官能度和可渗透性。它们具有优异的稳定性,足以满足化学负载。本研究的目的是:首先研究了四种制备微胶囊的主要方法。这些方法有化学方法、物理方法、物理化学方法和微流体方法。这项研究进一步检查了四种方法的各种优点和缺点。此外,本研究将讨论微胶囊在药物递送、医药和化妆品工业中的一些应用。其次,制备了两种不同的方法:双乳液-溶剂蒸发和微流控法制备复合微胶囊,分别制备了以水溶性聚合物膜和油膜为内壳和外层的空心核壳复合微胶囊。所公开的方法依赖于使用手持均质器通过双乳化溶剂蒸发过程生产含油微胶囊。在这项工作中制造复杂微胶囊的原理包括在油相中溶解溶剂蒸发技术产生的简单微胶囊,用微流体装置在微胶囊周围形成附加层以产生所需复合MIC。胶囊(双壳微粒)。最后介绍了两种方法的优缺点。此外,通过光学显微镜对微粒直径和平均粒径分布进行了测量和测量,并利用图像分析软件image J对捕获的图像进行处理。在这项研究工作中,关于PVA含量的影响分析和更好地控制PVA浓度是将来的主要工作。

关键词：微胶囊微胶囊制造微胶囊化药物载体微粒

Open Fractures of Limbs by the Bite of Domestic Donkeys: An Unusual Aetiology

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Open Journal of Orthopedics 2022年第12期12卷 485-492页

作者： mohamed Sidibé mohamed Lamine bah Fodé Mahamoud Sylla Tafsir Camara Serge Ntungwanayo Orthopedic-Traumatology Department of the Tambacounda Regional Hospital Tambacounda Senegal Orthopedic-Traumatology Department of the Ignace Deen National Hospital in the Republic of Guinea Conakry Guinea

Introduction: The aim of this study is to describe the epidemiological, lesional, therapeutic and evolutionary profile of open fractures of limbs by bites of domestic donkeys. Patients and Methods: This is a prospective descriptive study over 28 months made in the Orthopedics-Traumatology department of the Tambacounda Regional Hospital in Senegal, concerning patients bitten by donkeys, resulting in an open fracture of the thoracic and pelvic limbs. Results: Twelve male patients were included. The average age was 10.50 years ± 2.60. The most common circumstance was the bite when two donkeys were separated. The thoracic limbs were the most affected by the occurrence of the arm. Cauchoix-Duparc type II and AO A2 and B2 were predominant. The essential trimming/osteosynthesis was carried out within 24 hours of the bite. Serovaccination was systematic, but on the other hand, a single dose of anti-rabies serum was administered. Pinning was the most commonly used bone synthesis. Complications were mainly infectious, followed by a case of radial nerve palsy and non-union on pins. Conclusion: The typical profile of an open donkey bite fracture is a male child/adolescent who is bitten during the separation of two fighting donkeys. The lesions are most often found in the thoracic limbs with a predominance of Cauchoix-Duparc type II and type A2 and B2 fractures of the AO, whose treatment consisted of trimming and pinning. The infectious complications of the soft tissues marked the evolution.

关键词： Open Fractures Limbs Bite Donkeys

Giant Cell Tumor of the Proximal Phalanx of the Little Finger about One Case in Our Milieu

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Open Journal of Orthopedics 2022年第8期12卷 345-350页

作者： mohamed Sidibé mohamed Lamine bah Fodé Mahamoud Sylla Minkailou Camara Alhassane Soumah Serge Ntungwanayo Orthopedic-Traumatology Department of the Tambacounda Regional Hospital Tambacounda Senegal Orthopedic-Traumatology Department of the Ignace Deen National Hospital Conakry Republic of Guinea

Giant cell tumor is a benign primary bone tumor. The phalangeal localization is rare. It is distinguished from other locations by the local aggressiveness of the tumor and a high rate of recurrence. We report one case of a 25-year-old right-handed nurse with no reported pathological history who complained about an ulcero-budding mass of the right little finger evolving one year ago. She would have initially consulted a bonesetter who would have taken care of her by using decoctions. The hand X-ray showed an osteolytic tumor of the first phalanx of the right little finger with a “honeycomb” appearance invading the soft tissues. We carried out the amputation of the radius. The postoperative course was simple with healing of the surgical wound and disappearance of the axillary adenopathy. The surgical specimen after anatomopathology exam concluded to be a grade 2 giant cell tumor of Senerkin.

关键词： Giant Cell Tumor Phalanx Little Finger Amputation of the Radius

Intradialytic Hypertension and Associated Factors in Chronic Hemodialysis at the National Hemodidiadiasis Center in Donka, Guinea

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Open Journal of Nephrology 2020年第1期10卷 34-42页

作者： Fousseny Diakité Mamadou Saliou Baldé Alpha Koné Moussa Traoré Ibrahima Chérif Alpha Boubacar bah mohamed Tassilmy Diaby Alpha Oumar bah mohamed Lamine Kaba Nephrology-Hemodialysis Service Donka National Hospital Conakry Guinea Service of Cardiology National Hospital of Ignatius Deen Conakry Guinea

Introduction: Dialytic high blood pressure (DHBP), although often ignored, is now recognized as a recurring and persistent phenomenon in a subgroup of hemodialysized patients. Its occurrence is associated with an increased risk of hospitalization and death. The objective of the study was to determine the prevalence of intradialytic hypertension and the factors associated with it. Methods: Study was cross-sectional, monocentric, descriptive and analytical over a three-month period from April 22 to July 22, 2019. Included were all patients 18 years of age or older, chronic hemodialysis for at least three months, with intra-dialytic high blood pressure. The blood pressure machine used for the majority of patients was an electronic “OMRON” blood pressure monitor. Epidemiological, clinical, para clinical and dialysis parameters were studied. The data were collected, captured and analyzed using IBM SPSS Statistics Version 20 software. The factors associated with intradialytic high blood pressure were searched using a univariate logistic regression model. The significance threshold for all statistical tests has been set at 5%. Results: Of our 131 patients, 53 had intradialytic hypertension, a frequency of 40.5%. The time of (DHBP) occurrence was more frequent at the 3rd and 2nd hour, 94.34% and 86.79%, respectively. The average age of patients was 45.51 years with extremes ranging from 19 to 70 years. The average Systolic Blood Pressure (SBP) before dialysis was 148 mm Hg ?16.62 and the average Diastolic Blood Pressure (DBP) before dialysis was 88 mm Hg ?12.50. Pre-dialysis Blood Pressure—140/90 mm Hg was noted in 18 cases, or 34.0%. The intradialytic average SBP was 164 mm Hg ?17.25 with extremes of 121 to 202 mm Hg. The intradialytic average DBP was 92 mm Hg ?12.52 with extremes 67 to 124 mm Hg. The main risk factors associated with intra-dialytic hyperation were: Age range (40 - 50 years), Duration on dialysis (Conclusion: This study, the first of its kind in Guinea, wa

关键词： Risk Factors Intradialytic Hypertension Donka Guinea

Frequency of the Cardiovascular Complications during the Chronic Renal Insufficiency with the Service of Nephrology of the National Hospital Donka

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World Journal of Cardiovascular Diseases 2020年第7期10卷 425-431页

作者： Fousseny Diakité Mamadou Saliou Baldé Ibrahima Sory Barry Moussa Traoré Alpha Boubacar bah Fenela Mipimbou mohamed Lamine Kaba Alpha Oumar bah Unit of Nephrology-Hemodialysis of the National Hospital Donka Guinea Unit of Cardiology of the National Hospital Ignace Deen Guinea

Introduction: Cardiovascular disease has become a major concern for the nephrologist as it is the leading cause of morbidity and mortality in patients with chronic kidney disease, and affects all stages of the disease, including the earliest stages of the disease. The goal of this work was to determine the frequency of cardiovascular complications during chronic kidney failure. Patients and methods: This was a six-month, descriptive cross-sectional study from March 01 to August 31, 2018. It covered all patients with chronic kidney disease hospitalized in the ward during the study period. Included were all chronic kidney failure patients with at least one cardiac and/or vascular complication diagnosed either on clinical examination, and/or paraclinical examination (Electrocardiogram or cardiac ultrasound, vessel echodoppler, scan). Results: During the study period, 84 out of 378 patients or 22.22% had at least one cardiovascular complication. Cardiovascular complications were hypertrophy of the left ventricle with 49/84 (44 at Electrocardiogram and 5 at cardiac echodoppler), valvulopathy with 33.33%, stroke with 50% of cases, obliterating arterial disease of the lower limbs 25%, hypokinetic dilated cardiomyopathy with 9/36 cases and pericarditis with 2/36. Conclusion: Cardiovascular complications affect both sexes and all ages. They were dominated by enlarged left ventricle, valvulopathy and dila

关键词： Cardiovascular Complications Chronic Kidney Failure Donka Conakry