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Cerebellar Syndrome Revealing a Giant Postero Inferior Cerebellar Artery Aneurysm: A Case Report and a Review of Literature

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Case Reports in Clinical Medicine 2021年第6期10卷 153-159页

作者： Oumar Diallo Maiga Abdoulaye Hima Beketi Katanga Anthony Thioub Mbaye Mahamadou Dama Oumar Coulibaly Daouda Sissoko alpha singuepire Drissa Kanikomo Seydou Boubakar Badiane Hospital of Mali Bamako Mali Hospital of Niamey Niamey Niger University of Kara Kara Togo University Checkh Anta Diop Dakar Senegal Regional Hospital of Segou Ségou Mali Hospital Gabriel Touré Bamako Mali

Context: Cerebellar syndrome caused by disturbances of balance and coordination is not an uncommon neurological disorder. It has varied etiologies usually caused by tumor processes or suppurative collections. Vascular causes remain very rare, especially when it is a giant aneurysm of PICA representing 1% of intracranial aneurysms. Treating giant PICA aneurysms is a very difficult task for neurosurgeons because the surgical dissection can lead to severe damage due to the intimate relationship of PICA with the brainstem or nerve structures. We report a case of giant PICA aneurysm responsible for cerebellar syndrome successfully treated with surgery. The objective of this work is to draw the attention of practitioners to this unusual cause which can lead to diagnosis wandering and a lack of planning at the time of management. Case report: A 65 years old hypertensive patient was seen for a progressive disturbance of balance and walking disorder, but worsened in the last three months with no notion of fever. On admission, the patient was lucid, oriented in time and space and presented with static and kinetic cerebellar syndrome. Brain CT-scan without and with contrast revealed a tissular mass in the posterior fossa suggesting a tumor process, however, CT angiography showed a giant aneurysm of the PICA after reconstruction. A careful microdissection by a sub-occipital approach was decided. Opening the large cistern made it possible to visualize the aneurysm sack surrounded by a yellowish gliosis. The reclining and microdissection revealed the neck of the aneurysm, which was clipped to exclude the giant aneurysm in block. Postoperative follow-up was simple with progressive improvement in the cerebellar syndrome and walking over three months. Conclusion: Giant aneurysm of the PICA is rare. The localization in the posterior cerebral fossa can be confusing. Microsurgery gives a good result.

关键词： Giant Aneurysm PICA Cerebellar Syndrome CT Angiography

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Cerebellar Syndrome Revealing a Giant Postero Inferior Cerebellar Artery Aneurysm: A Case Report and a Review of Literature

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Case Reports in Clinical Medicine 2021年第6期

作者： Oumar Diallo Maiga Abdoulaye Hima Beketi Katanga Anthony Thioub Mbaye Mahamadou Dama Oumar Coulibaly Daouda Sissoko alpha singuepire Drissa Kanikomo Seydou Boubakar Badiane

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GO-modified flexible polymer nanocomposites fabricated via 3D stereolithography

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Frontiers of Chemical Science and Engineering 2019年第4期13卷 736-743页

作者： Chi Him alpha Tsang Adilet Zhakeyev Dennis Y.C.Leung Jin Xuan School of Environmental Sciences and Engineering Sun Yat-Sen UniversityGuangzhou 510006China Department of Mechanical Engineering The University of Hong KongHong KongChina Department of Chemical Engineering Loughborough UniversityLoughboroughLE113TUUK

Graphene oxide(GO)induced enhancement of elastomer properties showed a great deal of potential in recent years,but it is still limited by the barrier of the complicated synthesis ***(SLA),used in fabrication of thermosets and very recently in“flexible”polymers with elastomeric properties,presents itself as simple and user-friendly method for integration of GO into *** this work,it was first time demonstrated that GO loadings can be incorporated into commercial flexible photopolymer resins to successfully fabricate GO/elastomer nanocomposites via readily accessible,consumer-oriented SLA *** material properties of the resulting polymer was characterized and *** mechanical strength,stiffness,and the elongation of the resulting polymer decreased with the addition of *** thermal properties were also adversely affected upon the increase in the GO content based on differential scanning calorimetry and thermogravimetric analysis *** was proposed that the GO agglomerates within the 3D printed composites,can result in significant change in both mechanical and thermal properties of the resulting *** study demonstrated the possibility for the development of the GO/elastomer nanocomposites after the optimization of the GO/“Hexible”photoreactive resin formulation for SLA with suitable annealing process of the composite in future.

关键词： graphene oxide polymer flexible 3D printing stereolithography

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Mining Conversing Groups of Chatters in IRC Sooial Networks

Mining Conversing Groups of Chatters in IRC Sooial Networks

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作者： Charles alpha Bangura 湖南大学

学位级别：硕士

在聊天室环境下进行互联网对话已经成为在虚拟社区中进行通信的一种普遍形式。然而,聊天室的非正式对话与正规的静态集会在本质上有许多不同的属性（如噪声、简洁的表达语句、缩写字、易被利用的、多变和动态的讨论话题等）。互联网中...

在聊天室环境下进行互联网对话已经成为在虚拟社区中进行通信的一种普遍形式。然而,聊天室的非正式对话与正规的静态集会在本质上有许多不同的属性（如噪声、简洁的表达语句、缩写字、易被利用的、多变和动态的讨论话题等）。互联网中继聊天（Internet Relay Chat,IRC）网络文档的这种特性使得它的聊天数据不太适合使用现有的文本挖掘方法进行分析。例如,常被用来发现聊天者群组的挖掘方法如搜索聚类和降维方法通常是基于这样一个假设：搜索集合是一个用适当的语言书写的静态的离散文档集,而这种文档的属性在IRC的聊天数据中是缺乏的。但是,IRC聊天室中的交流和沟通中包含了关于聊天者群组的有价值的信息,这些聊天者群组是正式的或自主形成的,他们进行交流的目的也是多样化的。同时,人类的沟通巾通常包含一种用来强调结果的隐喻效果。因此,进行IRC聊天数据的搜索和分析是一个很有意义的工作。本文的工作主要关注如何设计一种易于使用的方法来增强针对IRC聊天数据的搜索算法的实现。在本文中,我们设计了一个完全自动化的客户端-服务器-客户端（client-server-client,CSC）系统,用于数据收集和对三个被观测的聊天室（政策、食品安全和趣味聊天）的社交网络图（Social Network Graphs）进行推测。这个CSC系统由如下三个组件组成：首先,CSC系统包含了一个主IRC客户端,这个客户端为聊天者进行私下或公开的基于文本的会议交流提供了聊天室环境。IRC客户端本身可以对聊天者个人和聊天室行为的数据进行收集,这些数据可以用于静态的分析。第二,CSC系统包含一个名为pieSpy的代理客户端（bot-client）组件,它连接到主IRC客户端的服务器上,其功能是通过服务器从CSC系统中提取信息,使用一些基本的启发式算法来推测出三个聊天室的社交网络图。第三,系统中包含一个或多个服务器,它形成了整个CSC系统的中心,因为它是IRC协议中唯一的可以通过提供一个或多个节点来将其他组件链接到一起的组件,而客户端或服务器可以通过连接到这些节点来与其他客户端或服务器进行对话。系统由一个基于奇异值分解（Singular Value Decomposition）的计算算法支持,该算法主要用于搜索聊天室中的聊天者群组和隐藏的通信模式。但是,这个基于奇异值分解的算法的计算复杂度达到了O（m3）,代价过高,这样,在有效的计算时问内无法进行太大的矩阵运算。本文提出了一种基于快速奇异值分解的算法,它已被证明比基于奇异值分解的算法更简单、清晰,且具有更好的计算性能和更快的运行时间。而该算法仅要求在采样阶段做更多的工作。在我们的实验中,性能评估被用来对PieSpy程序、基于奇异值分解的算法以及本文设计的快速奇异值分解算法在真实IRC数据上进行有效性的验证。通过这个验证方法,可以得出如下结论：（i）不同聊天室的静态属性有显著变化,因此对聊天室进行数据分析是可能的。（ii）所实现的两个分析工具（基于奇异值分解和快速奇异值分解的算法）都是基于采用更过数学运算过程的降维方法来搜索在IRC社交网络中被观测的聊天室中的普通群组和隐藏群组（如由边相连的节点组）。在这个算法评估的过程中,本文利用收集的数据手工制作了一个图形工具,利用它生成的点和边与各各算法生成的点和边进行比较。比较的结果再通过一个数学的计算来确定每个算法丢失的点和边的百分比。有趣的是,本文的算法,快速奇异值分解算法被证明比基于奇异值分解的算法具有更高的性能,它能生成更低的点和边丢失率。

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嵌入式图像编码的高效性与实现

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华中科技大学学报（自然科学版） 2001年第9期29卷 95-98页

作者： Keita alpha 彭嘉雄华中科技大学图像识别与人工智能研究所

研究嵌入式图像编码的效率 ,指出实际图像在小波基上分解时 ,可知大的分解系数量化值相对于小的系数量化值位置的先验信息 ,从而实现嵌入编码的高效性 .研究了小波嵌入编码与零树编码的实现 .将嵌入小波编码的重要性图存放在零树中 ,并... 详细信息

研究嵌入式图像编码的效率 ,指出实际图像在小波基上分解时 ,可知大的分解系数量化值相对于小的系数量化值位置的先验信息 ,从而实现嵌入编码的高效性 .研究了小波嵌入编码与零树编码的实现 .将嵌入小波编码的重要性图存放在零树中 ,并用四叉树结构表示 .实验与分析表明 ,在 0 .2 5比特 /像素的情形下就能获得视觉质量高的图像 ,比JPEG编码结果要好 ;小波嵌入编码的计算峰值信噪比曲线与理论估计的符合良好 .

关键词：图像处理零树编码图像编码小波嵌入编码系数量化值四叉树结构

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Evaluation of the Severity of Maxillo-Facial Injuries by Motorcycle Road Accident in the Teaching Hospital of Conakry: A Case-Control Study

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Open Journal of Stomatology 2021年第3期11卷 107-118页

作者： Oumar Raphiou Diallo alpha Oumar Diallo Karamoko alpha Diallo Alhassane Conde Department of Odontostomatology and Maxillo-Facial Surgery National Hospital of Donka Conakry Guinea Department of ENT National Hospital of Ignace Deen Conakry Guinea

Introduction: Maxillofacial injuries caused by motorcycle road accidents are serious and represent a real public health issue. They mainly affect young adult males. The objectives of this study were to determine the frequency of motorcycle road accidents, describe the socio-demographic characteristics of the injured, determine the degree of severity of motorcycle injuries compared to car injuries, and describe the therapeutic modalities. Materials and Method: This study was a prospective case-control study carried out in the Department of Odontostomatology, Maxillofacial Surgery and Surgical Emergencies at the National Hospital of Donka. The data was collected over a period of six months from January 1st to June 30th, 2017. All victims of road accidents by motorcycle (cases) or car (controls) that received care and post-surgical follow up were included. Results: A total of 505 patients with maxillofacial injuries were reviewed during the period of the study. From the review, 205 (40.6%) motorcycle accidents were recorded as “cases” and 109 (21.58%) car accidents were classified as “controls” group. Men were the most affected in both groups, n = 254 (177 males in the case group and 77 in the control) (p = 0.01). There was a proportionate relationship between helmet use and death (p = 0.015). A motorcycle accident victim is more likely to develop a mandibular fracture (p = 0.029) and limb injury (p = 0.034) when compared to a car accident victim. However, there was no significant difference between cases and controls for head trauma (p = 0.4878), Facial Injury Severity Scale (FISS) (p = 0.130), and Glasgow score (p = 0.709). Conclusion: Maxillofacial injuries caused by motorcycle accidents are increasing in

关键词： Severity Maxillofacial Trauma Motorcycle Case-Control

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小波多尺度方法用于边缘检测

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华中科技大学学报（自然科学版） 2001年第5期29卷 74-76页

作者： Keita alpha 彭嘉雄华中科技大学图像识别与人工智能研究所图像信息处理与智能控制教育部重点实验室

小波极大值表达式给出了重构图像信息的一种新方法 ,它能从图像边缘的属性上扩展解决图像处理问题的方法 .由此提出小波多尺度方法对边缘进行检测和重构 .实验结果表明图像近似值可以从小波模极大值点中重构。

关键词：图像处理小波变换边缘检测小波多尺度方法小波模极大值点计算机图形点

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Factors of Success in International Business Negotiations

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海外英语 2010年第1X期 156-157页

作者： DODO alpha MAIMOUNA Faculty of Economics and Management Nanchang University

The success of international business relationships depends on effective business negotiations. Negotiators need to be well prepared. Understanding how to achieve international business negotiation outcomes and the fa... 详细信息

关键词： international business negotiators negotiating process negotiating outcomes

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Barriers to Utilization of Postnatal Care: A Qualitative Study in Guinea

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Open Journal of Obstetrics and Gynecology 2021年第4期11卷 391-402页

作者： Mamadou Dioulde Balde Aissatou Diallo Anne Marie Soumah alpha Oumar Sall Boubacar alpha Diallo Fanta Barry Amadou Oury Touré alpha Amadou Barry Sadan Camara Center for Research in Reproductive Health/Cellule de recherche en santé de la reproduction en Guinée (CERREGUI) Conakry Guinée University Hospital Donka Clinic of Gynecology and Obstetrics Conakry Guinea

Maternal mortality remains very high in developing countries. In Guinea, it is 550 maternal deaths in 100.000 living birth. More than half of these deaths occur in the postpartum period. Hence the interests to have a better understanding of the factors that hinder the realization of post-natal care (PNC) arise. It is for this reason that the objective of this study is to identify barriers to the use of post-natal care in Guinea. Methods: A qualitative study was conducted in the prefectures of Kindia and Dubréka, in the Administrative Region of Kindia (Guinea) in April and May 2014. Fourteen focus group discussions of women and girls of the community, as well as fifteen individual in-depth interviews (9 with women and 6 with healthcare providers). Results: Most women do their PNC during their child vaccination or in case of postpartum complications. Financial constraints are the main barrier to using postnatal care identified by participants. In general, distance from the health center associated with lack of transport mean and insufficient staffs are factors related to the health system. In addition, poor reception of clients, women’s experience during childbirth, poor programming for PNC as well as the lack of trust and confidentiality between clients and health care providers are the barriers related to health p

关键词： Barriers Postnatal Consultation Maternal Mortality Guinea

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Case Report: A Severe Hypernatremia with Multiple Organ Failure, about a Clinical Observation

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Open Journal of Nephrology 2017年第1期7卷 19-23页

作者： alpha Oumar Bah Mamadou Cellou Balde Amadou Bah alpha Oumar Barry Departement of Nephrology Donka National Hospital Conakry Guinea Departement of Nephrology-Hemodialysis Chiva Hospital Foix Cedex France Departement of Diabetology Donka National Hospital Conakry Guinea Departement of Reanimation Donka National Hospital Conakry Guinea

A hypernatremia severity is often associated with a poor prognosis, especially if it is associated with multiple organ failure. In a country with very limited resources, the prognosis may be favorable in the absence of renal replacement. We report the case of a 63 years old woman, hypertensive and diabetic, admitted to the ICU for unconsciousness. Clinically, neurological examination notes a Glasgow of 8/15 (Y2, V2, M4) and a left hemiplegia. Temperature was 39°C. Diuresis was 100 ml during the first 24 hours. Blood pressure was 90/60 mmHg, tachycardia at 133/min. Cardiac auscultation is normal. Vascular axes were weakly perceptible. Oxygen saturation was 95%. The skin examination notes a dry skin and mucous membranes, a flattening of the superficial veins, sunken eyes and a persistent skin fold. There is no hepatomegaly or splenomegaly, or jaundice. Biological point of view note natremia: 176 mmol/L;osmolarity: 390 mosmol/kg;creatinin: 300 μmol/L;glycemia > 6 g/L;transaminases 217 UI. Diagnostics: malignant hypernatremia with a high plasma osmolarity associated with an acute anuric renal failure, hydro electrolytic disorders, an abnormal liver function, a fever of central origin and a stroke. The treatment consisted of a correction of the electrolyte disorders by infusion of isotonic and hypotonic fluids with insulin. In a country with very limited resources, the severe hypernatremia prognosis associated with anuric acute renal failure may be favorable in the absence of renal replacement.

关键词： Hypernatremia Hyperosmolar Coma Multiple Organ Failure Acute Renal Failure Diabetes

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