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Search Results: 1 - 10 of 3514 matches for " Serge Arnold Ebongue "
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Epidemiology, Clinical and Paraclinical Presentations of Pulmonary Embolism: A Cross-Sectional Study in a Sub-Saharan Africa Setting  [PDF]
Bertrand Hugo Mbatchou Ngahane, Félicité Kamdem, Silvain Raoul Simeni Njonnou, Nina Chebou, Anastase Dzudie, Serge Arnold Ebongue, Bruno Tengang, Fernando Kemta Lekpa, Yacouba Mapoure Njankouo, Sidick Mouliom, Henri Roger Ngote, Henry Luma Namme
Open Journal of Respiratory Diseases (OJRD) , 2019, DOI: 10.4236/ojrd.2019.93008
Abstract: Background: Venous thromboembolic (VTE) disease burden is increasing worldwide, representing a major cause of cardiovascular death and public health problem. Pulmonary embolism (PE) is the most serious clinical presentation of VTE. Epidemiological and clinical data on PE are still lacking in Africa, particularly in Cameroon. This study aimed at determining the clinical features as well as imaging presentation and outcome of pulmonary embolism. Methods: A cross-sectional study was carried out in three hospitals in Douala. We retrospectively reviewed patient records admitted for PE from January 2009 to May 2017. We collected data on epidemiology, clinical presentation, venous Doppler/pulmonary computed tomographic angiography (CTA), and outcome. Results: We included 103 patients (56 males) with PE. Their median age was 52 years. The main risk factors were obesity (49.5%), hypertension (35.0%), long trip (24.3%) and cancer (18.4%). The most frequent clinical presentations were dyspnoea (83.4%), chest pain (78.6%), and cough (40.8%). Additionally, pleural effusion (32.8%), atelectasis (25.7%) and pulmonary hyperlucency (20.0%) were the most frequent findings on chest X-ray. The main abnormalities found in electrocardiogram were sinus tachycardia (63.4%), S1Q3T3 aspect (37.6%) and right axial deviation (28.7%). Moreover, right cavities dilatation (26.0%), pulmonary artery hypertension (35.0%) and pulmonary artery dilatation (21.0%) were the main echocardiographic findings. Low-molecular-weight heparin (LMWH) was the initial anticoagulant in all cases. There were 19 (18.4%) in-hospital deaths, and the mean hospital stay was 8.5 ± 5 days. Conclusion: PE is not rare in our setting. Obesity, long trip and cancer are the main risk factors, while dyspnoea, chest pain and respiratory distress are the main clinical presentation for PE. LMWH remains the therapeutic agent of choice. Lastly, in-hospital mortality is very high.
Rural Wireless Mesh Network: A Design Methodology  [PDF]
Jean Louis Ebongue Kedieng Fendji, Jean Michel Nlong
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2015, DOI: 10.4236/ijcns.2015.81001
Abstract: Wireless Mesh Network is presented as an appealing solution for bridging the digital divide between developed and under-developed regions. But the planning and deployment of these networks are not just a technical matter, since the success depends on many other factors tied to the related region. Although we observe some deployments, to ensure usefulness and sustainability, there is still a need of concrete design process model and proper network planning approach for rural regions, especially in Sub-Saharan Africa. This paper presents a design methodology to provide network connectivity from a landline node in a rural region at very low cost. We propose a methodology composed of ten steps, starting by a deep analysis of the region in order to identify relevant constraints and useful applications to sustain local activities and communication. Approach for planning the physical architecture of the network is based on an indoor-outdoor deployment for reducing the overall cost of the network.
Rethinking Network Connectivity in Rural Communities in Cameroon
Jean Louis Fendji Kedieng Ebongue
Computer Science , 2015,
Abstract: To bridge the digital divide between the urban and rural regions, the government of Cameroon has launched the Multipurpose Community Telecentres (MCT). But this project does not seems to sustain the local development. The aim of this study is threefold: to determine the ICT penetration in rural Cameroon and Internet adoption; to evaluate the impact of MCTs in rural region and to provide some recommendations for both the network planning and the development of suitable services. The study considers two rural communities in Cameroon. The results show that despite low incomes, and MCTs that are missing their goal, there is some readiness of local populations to welcome ICT projects in order to improve their daily life and activities. To design sustainable ICT projects for those regions, we provide some recommendations from network design to business strategy.
Magnetic-Field Effects on Donor Impurity States in a Quantum Well  [PDF]
Arnold Abramov
World Journal of Condensed Matter Physics (WJCMP) , 2012, DOI: 10.4236/wjcmp.2012.24031
Abstract: Green’s function technique is used to obtain the solution of Shredinger equation for impurity states in a quantum well (QW) under the magnetic field. Binding energy of impurity states is defined as poles of the wave function. We studied effects of the magnetic field magnitude and impurity position on the binding energy. The calculations were performed for both ground and excited states. The dependences of binding energies versus impurity position and magnetic field are presented for GaAs/Al0.3Ga0.7As QW.
Creativity, Wicked Problems and the Contemporary PhD  [PDF]
Josie Arnold
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.48019
Abstract: In this paper, I survey the challenges the creative and contemporary PhD make to the academy. I look at the scholarship entailed in creative production and in identifying and working with wicked problems as having similar attributes contributing to the need to create new PhD models. Traditionally, the PhD has been a preparation for a career in the academy, with scholars undertaking it so as to show their capacity to identify a research gap in their area, to develop a research question from that and to build a major and new contribution to knowledge in a written submission of some 100,000 words. This traditional model is based upon the certainties of scholarship within enlightenment ideals of science. These have delivered us great strides in many areas of medicine and science and have also come, because of their productivity, to dominate the arts, particularly the social sciences and psychology. Whilst its value should not be debased, this enlightenment model has been challenged from such different areas of scholarship as creative production and wicked problems. The core ideas in this paper are how we might utilise creativity and emerging ideas of wicked problems to debate the importance of understanding the contemporary PhD.
Toward an integrative model for alcohol use and dependence  [PDF]
Serge Combaluzier
Open Journal of Psychiatry (OJPsych) , 2012, DOI: 10.4236/ojpsych.2012.24044
Abstract: Background: If the alcohol use and dependence disorders are differentiated by the pharmaco-dependence, they share complex relationships with other clinical disorders and personality disorders. The purpose of this paper is to produce a model that reflects its relations both among users than among addicts. Method: Data from questionnaires measuring key variables selected for this study have been collected from people with alcohol misuse (n = 83) and alcohol-dependent (n = 81) in rehab. A model of drug dependence has been produced from these data that gives complete satisfaction to the criteria of SEM. Discussion: This model reflects the shift from abuse to a dependent consumption by the presence of feedbacks involving pharmaco-dependence, disturbance of the alcohol consumption by psychological distress and depressive traits. To further guarantee its validity, however it should be tested by collecting data from other surveys.
Microbial Ecology and Antibiotic Susceptibility Profile of Germs Isolated from Hospital Surfaces and Medical Devices in a Reference Hospital in Douala (Cameroon)  [PDF]
Cécile Okalla Ebongue, Chanceline Mayoudom Nguatcheussi, Jean-Pierre Nda Mefo’o, Joss Bollanga, Dieudonné Adiogo, Henry Namme Luma
Advances in Microbiology (AiM) , 2018, DOI: 10.4236/aim.2018.82009
Abstract: Background: The hospital environment is largely contaminated with pathogenic microorganisms. This colonization is a threat for hospitalized patients, especially in high-risk services. The purpose of this study was to identify the germs found on surfaces and medical devices in some departments of the General Hospital of Douala, and to establish their susceptibility profile to most commonly used antibiotics in this health facility. Results: We collected 114 surface and medical device samples, and seeded different culture media for Gram-positive and Gram-negative aerobic bacteria. Of the total samples, 108 were positive and 137 bacterial strains were isolated. The colony count revealed a high rate of contamination. Enterobacter cloacae was the most represented specie (53.3%), followed by Pseudomonas aeruginosa (22.6%) and Klebsiella pneumoniae (6.6%). Various coagulase-negative Staphylococci have been isolated in some departments, as well as Cryptococcus laurentii and molds. The isolated strains showed low susceptibility to the antibiotics tested. Enterobacter cloacae showed low susceptibility for all tested molecules, except for carbapenems with rates ranging from 82% to over 94% in Maternity, Intensive Care and Neonatology units. The strains coming from the Haematology Protected Ward were resistant to all antibiotics, except fluoroquinolones with a susceptibility rate of 50% for ofloxacin. Conclusion: The hospital surfaces and medical devices are highly contaminated by environmental bacteria, with low susceptibility rates to antibiotics. Microbiological controls of the environment should be regular in critical areas in order to reinforce measures to prevent diffusion of multi-resistant bacteria.
Managing Ethical Risks and Crises: Beyond Legal Compliance  [PDF]
Diane Huberman Arnold, Keith Arnold, Vanessa J. Arnold
Beijing Law Review (BLR) , 2010, DOI: 10.4236/blr.2010.11001
Abstract: Recent interest in culture stems from its power to explain corporate and organizational failures. Such failures are both internal and external: accounting fraud, management misconduct, harassment and bullying in the workplace, racism, sexism, environmental issues, and health and safety concerns. Current theory holds that these failures are to be explained partly by the particular, poor organizational culture and unhealthy climate, poor leadership, and by the misdeeds of a few bad apples. When economic conditions are negative, organizations look to legislation, regulations, and codes, to reform their culture, and manage the risks of organizational failure. Both the compliance strategy, demanding obedience to laws, regulations and codes, and the integrity or values strategy, focusing on ethics training, education, tone at the top, and the hiring of employees with integrity and values, are the mainstay of recent legislation and regulations in North America and the European Union. We criticize the reliance on legislation, regulations and codes, the focus of a compliance solution which we find inadequate, ineffective, and unenforceable. We suggest reliance on a front-end, proactive and preventive program of best, precautionary practices, will better meet the challenge, in prosperity or poverty, of setting corporate culture on the right track.
A Metropolis Approach for Mesh Router Nodes placement in Rural Wireless Mesh Networks
Jean Louis Ebongue Kedieng Fendji,Christopher Thron,Jean Michel Nlong
Computer Science , 2015, DOI: 10.17706/jcp.10.2.101-114
Abstract: Wireless mesh networks appear as an appealing solution to reduce the digital divide between rural and urban regions. However the placement of router nodes is still a critical issue when planning this type of network, especially in rural regions where we usually observe low density and sparse population. In this paper, we firstly provide a network model tied to rural regions by considering the area to cover as decomposed into a set of elementary areas which can be required or optional in terms of coverage and where a node can be placed or not. Afterwards, we try to determine an optimal number and positions of mesh router nodes while maximizing the coverage of areas of interest, minimizing the coverage of optional areas and ensuring connectivity of all mesh router nodes. For that we propose a particularized algorithm based on Metropolis approach to ensure an optimal coverage and connectivity with an optimal number of routers. The proposed algorithm is evaluated on different region instances. We obtained a required coverage between 94% and 97% and a coverage percentage of optional areas less than 16% with an optimal number of routers nr_max2 =1.3*nr_min , (nr_min being the minimum number of router which is the ratio between the total area requiring coverage and the area which can be covered by a router).
Mesh Router Nodes placement in Rural Wireless Mesh Networks
Jean Louis Fendji Kedieng Ebongue,Christopher Thron,Jean Michel Nlong
Computer Science , 2015,
Abstract: The problem of placement of mesh router nodes in Wireless Mesh Networks is known to be a NP hard problem. In this paper, the problem is addressed under a constraint of network model tied to rural regions where we usually observe low density and sparse population. We consider the area to cover as decomposed into a set of elementary areas which can be required or optional in terms of coverage and where a node can be placed or not. We propose an effective algorithm to ensure the coverage. This algorithm is based on metropolis approach. We evaluated the proposed algorithm on an instance network. A close to 100 percent coverage with an optimal number of routers showed the efficiency of our approach for the mesh router node placement problem
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