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Search Results: 1 - 10 of 1708 matches for " Fabien II Ndzana "
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Dissipative Discrete System with Nearest-Neighbor Interaction for the Nonlinear Electrical Lattice  [PDF]
Sa?dou Abdoulkary, Tibi Beda, Serge Y. Doka, Fabien II Ndzana, Louis Kavitha, Alidou Mohamadou
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.36060
Abstract: A generalized dissipative discrete complex Ginzburg-Landau equation that governs the wave propagation in dissipative discrete nonlinear electrical transmission line with negative nonlinear resistance is derived. This equation presents arbitrarily nearest-neighbor nonlinearities. We analyze the properties of such model both in connection to their modulational stability, as well as in regard to the generation of intrinsic localized modes. We present a generalized discrete Lange-Newell criterion. Numerical simulations are performed and we show that discrete breathers are generated through modulational instability.
Application of LED Type Lamps in Domestic and Public Utilities and Gain Capability to Run New Small Investments in Rwanda  [PDF]
Mukundufite Fabien
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510093

The Rwandan State-run Energy Water and Sanitation Authority Company (EWSA) is rapidly increasing the number of population having access to electrical power energy. 30% of electrical energy is used in lighting. The incandescent bulbs, compact fluorescent lamp bulbs as well as fluorescent tubes are mostly used to convert electrical energy into light. The said light sources have many disadvantages such as excessive power consumption leading to giant bills of electricity, short life span leading to continuous replacement of lamps, and emission of CO2. Application of light-emitting diode (LED) lamps in lighting in long term suppresses the aforementioned problems resulting into saving of money that will be used for running new small investments.

An Assessment of Both Patients and Medical Staff Awareness of the Risks of Ionizing Radiation from CT Scan in Cameroon  [PDF]
Mathurin Neossi Guena, Daniel Ngalaleu Nguemeleu, Thierry Ndzana Ndah, Boniface Moifo
Open Journal of Radiology (OJRad) , 2017, DOI: 10.4236/ojrad.2017.73022
Abstract: Objectives: To assess the patients and health personnel’s level of awareness on risks related to ionizing radiation during CT scan. Materials and methods: Three questionnaires were addressed to patients, prescribing physicians, and the medical imaging staff for three hospitals respectively. This permitted us to assess their knowledge on the benefits and risks of the required medical exam, based on the dangers of being exposed to X-rays, especially induced-radiation cancer following the amount of X-rays received during a CT scan and the possibility of not receiving radiation as tools of diagnosis. Results: 150 patients, 84 referring doctors of CT scan tests and 60 medical imaging personnel were retained. For patients, only 7.1% received information on the benefits and risks of their exams, and 34.4% believed that x-rays were harmful to their health. For the prescribers, 46.7% took into account the benefits/risk ratio before prescribing a test and only 16.7% of the referring doctors have informed the patient of the risks related to X-ray. 90% of the medical imaging staff ensures that the required test is justified, and 50% informed the patient on the risks associated with their radiation exposure, and the increased risk of developing cancer. 65% of the imaging staff could not estimate the dose that the patient will receive during the medical test. 25% mentioned the dose received during the acquisition in the patient’s exam report. Conclusion: This study confirms that the referring doctors, the patients, and the radiologists have a low knowledge concerning the risks associated with radiation exposure during a CT scan assessment. We will therefore say that patients and prescribers are not aware of the doses of radiation on CT and their possible risks, even though there is a risk of developing cancer.
Diagnostic Reference Levels of Adults CT-Scan Imaging in Cameroon: A Pilot Study of Four Commonest CT-Protocols in Five Radiology Departments  [PDF]
Boniface Moifo, Jean Roger Moulion Tapouh, Mathurin Neossi Guena, Thierry Ndzana Ndah, Richard Ndi Samba, Augustin Simo
Open Journal of Medical Imaging (OJMI) , 2017, DOI: 10.4236/ojmi.2017.71001
Abstract: CT-scan is the most irradiating tool in diagnostic radiology. For 5% - 10% of diagnostic X-ray procedures, it is responsible for 34% of irradiation according to UNSCEAR. Patients radiation protection must therefore be increased during CT-scan procedures. This requires the rigorous application of optimization principle which imposes to have “diagnostic reference levels”. Objective: The aim of this study was to determine the diagnostic reference levels (DRLs) of the four most frequent CT-scans examinations of adults in Cameroon. Material and Method: It was a cross-sectional pilot study carried out from April to September 2015 in five health facilities using CT-scan in Cameroon. The studied variables were: patients age and sex, type of CT-scan examination (cerebral, chest, abdomino-pelvic, lumbar spine), Used of IV contrast (IV/ IV+), acquisition length, time of tube rotation, voltage (kV), mAs, pitch, thickness of slices, CTDIvol and DLP. For each type of examination, at least 30 patients were included per center, consecutively on the randomly predetermined days. The DRL for each type of examination was defined as the 75th percentile of its PDL and CTDIvol. Results: Of the 696 examinations, 41.2% were cerebral, 26.9% abdomino-pelvic, 17.7% lumbar spine and 14.2% chest. The mean age of patients was 52 ± 15 years [20 - 90 years], 58.9% were 50 years and older. The sex-ratio was 1.26 (55.9% males). The CT machines were 4, 8 and 16 multidetectors. The 75th percentile of DLP or DRLs [standard deviation] was: [1150 ± 278 mGy·cm], [770 ± 477 mGy·cm], [720 ± 170 mGy·cm] and [715 ± 187 mGy·cm] respectively for cerebral, lumbar spine, abdominopelvic and chest CT-scans. Taking in consideration the number of detectors, the 75th percentile of the Dose-Length product decreased with the increase number of detectors for cerebral examinations but was the highest with 16 MDCT for the abdominopelvic, lumbar spine and chest CT-scans. For the chest and lumbar spine examinations, there was a significant increase in patient-dose with the increase in the number of detectors. Conclusion: Our DRLs values lie between the norms of some European countries and those of some African countries. There is remarquable variation in dose for the commonest CT-scans examinations in Cameroon, requiring then an
Efficience d’un système bati sur le TRS global par poursuite du diagramme de fiabilité
T Kombe, ED Efaga, B Ndzana, E Niel
Afrique Science: Revue Internationale des Sciences et Technologie , 2006,
Abstract: The efficiency of the system built in the global OEE per pursuit of the Reliability Block Diagram The OEE (Overall Equipment Effectiveness) has become across the NFE 60-182 norm, one of the major performance indicator of the efficiency of the production systems. It integrates essentially three notions (Quality, Availability, and Performance) depended in internal of the reliability and the maintenance logistic. If the evaluation of one element’s OEE can be easy, his expression for a complex system is too difficult (the taking into account of redundancies, of temporal scale’s factors, of desynchronization, …). The use of the functional synchronized approach can bring solutions comparable to the block diagram reliability. We present in this paper a method of evaluation of the efficiency and the procedures of calculation of the OEE based in the global structure of systems (series and parallels) and the objectives of production (nominal and degraded).
Qualitative Economics—A Perspective on Organization and Economic Science  [PDF]
Michael Fast, Woodrow Clark II
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.22029
Abstract: Focus in this paper is on building a science of economics, grounded in understanding of organizations and what is beneath the surface of economic structures and activities. As a science Economics should be concerned with its assumptions, logic and lines of arguments, and how to develop theories and formulate ideas of reality. There is a disconnection between a science of economics focuses on structures and universal laws from what is experienced in everyday of life of business activity. The everyday of life of business is processual, dynamic and contradictional. This discussion of how to understand the everyday economic life is the central issue and is discussed from the perspective of interactionism. It is a perspective developed from the Lifeworld philosophical traditions, such as symbolic interactionism and phenomenology, seeking to develop the thinking of economics. The argument is that economics first of all is about two things; it is about interaction and it is about construction. If we are not able to understand and describe how people interact and construct, we cannot develop any theory of economics or understand human dynamics. So there are two issues to reflect upon: the object of thought and the process of thinking, e.g. the ontology and the epistemology.
Periscopic Survey of Current Library and Information Science Education and Practice in Nigeria
II Ekoja
Information Manager (The) , 2011,
Abstract: The paper is theoretical, more of a firsthand experience of what the author has observed as the current trends in Nigerian library and information science education and practice. The trends observed are increased ICT component in library schools curricula, increasing resort to the use of ICTs, which has also given rise to the challenge for digitization, archiving and preservation of electronic resources; proliferation of opportunities for training and retraining, which the Librarians Registration Council of Nigeria has braced up to with quality assurance measures to ensure that quality assurance is neither compromised in library schools nor in the field of practice; and entrepreneurship education aimed at producing self-employed graduates. The other trends are collaborative librarianship through consortium building to ensure sharing of resources, which is made easier by ICT application; decreased funding of libraries and influence of librarians as principal officers due to their inability to fit into the internal politics of their institutions; and a possibility for 24 hours library service, which many institutions’ libraries are planning the groundwork for. The paper submits that with better operational environments, Nigerian librarians will be able to respond better to existing and emerging trends in library and information practice.
Modern ICT Tools: Online Electronic Resources Sharing Using Web 2.0 and Its Implications For Library And Information Practice In Nigeria
II Ekoja
Samaru Journal of Information Studies , 2011,
Abstract: This paper is a reaffirmation of the importance of ICTs as tools for efficient and effective library services provision in terms of information acquisition, processing, storage and dissemination. Nigerian librarians are urged to acquire ICT skills to function in the modern information environment for them to maximize the benefits derivable from ICT use. This requires that libraries must automate their services to be able to operate using the Internet platform with all the advantages that it offers. Using the Internet libraries can own websites through which links can be provided for their users to numerous open source materials considering that most of them are unable to access fee-paying databases. Libraries can also operate information commons and derive the befits that go with their operations; and use web 2.0 tools like Facebook, RSS feeds, wikis, blogs, podcasts, flickr, tagging, Myspace, etc for web visibility, enhanced information generation, processing, dissemination, access and utilization, as well as facilitating two-way communication between them and users.
Ii Solihah
Media of Health Research and Development , 2012,
Abstract: The high number of maternal and Neonatal death rate in Indonesia frequently background by of three kind of delay (3T) one of which is delay in recognizing emergency signs and making decision where to refer to. This research aimed to recognize factors that related to husband's knowledge about danger signs at pregnancy time, partum, postpartum and neonat period, at Garut sub-province West Java in 2007. The researt using secondary data from "Survey Basic Data of Neonatal Essential Health Services Improvement Model at Garut sub-province, West Java, 2007", which has been conducted by Center of Health Research University of Indonesia & Center of Health Promotion Study FKM-UI in cooperation with Save the Children, at July until October 2007, in 40 villages from 10 district at Garut sub- province. The research design is cross sectional. Sample that used is the husband who having wife with baby or infant age 0-11 months. Total sample is 209 couples husband and wife. The data source from the module survey of husband and wife. The multivariate analysis result from regression of the last candidate model, multivariate model result that education variable is the dominant factor which related with husband knowledge about danger sign at pregnancy time, partus, postpartus, and neonates. Suggestion for Health Department of Republic Indonesia especially Health Promotion Section is to improve the cooperation in communication and information especially with national television institute for putting health information displaying event specially about danger sign at pregnancy time, partus, postpartus and neonates. sub-province Health Department shall; Advocate to the Garut sub-province local government for next affluent to Nasional Education Department to do education improvement for Garut sub-province people, suggested to health officer always to support the husband to develop their role in increasing knowledge of health maternal and neonatal, especially knowledge of danger sign in pregnancy time, partus, postpartus, and neonates, with event or agenda that interest the society. Keywords : Husband's knowledge about danger sign at pregnancy time, partus, postpartus and neonates.
Objective and automated protocols for the evaluation of biomedical search engines using No Title Evaluation protocols
Fabien Campagne
BMC Bioinformatics , 2008, DOI: 10.1186/1471-2105-9-132
Abstract: We describe two protocols for evaluating biomedical information retrieval techniques without human relevance judgments. We call these protocols No Title Evaluation (NT Evaluation). The first protocol measures performance for focused searches, where only one relevant document exists for each query. The second protocol measures performance for queries expected to have potentially many relevant documents per query (high-recall searches). Both protocols take advantage of the clear separation of titles and abstracts found in Medline. We compare the performance obtained with these evaluation protocols to results obtained by reusing the relevance judgments produced in the 2004 and 2005 TREC Genomics Track and observe significant correlations between performance rankings generated by our approach and TREC. Spearman's correlation coefficients in the range of 0.79–0.92 are observed comparing bpref measured with NT Evaluation or with TREC evaluations. For comparison, coefficients in the range 0.86–0.94 can be observed when evaluating the same set of methods with data from two independent TREC Genomics Track evaluations. We discuss the advantages of NT Evaluation over the TRels and the data fusion evaluation protocols introduced recently.Our results suggest that the NT Evaluation protocols described here could be used to optimize some search engine parameters before human evaluation. Further research is needed to determine if NT Evaluation or variants of these protocols can fully substitute for human evaluations.A search engine retrieves articles from a text collection (or text corpus) to best satisfy user queries. Articles that discuss material related to what the user was looking for when he formulated the query are defined as relevant. Other articles retrieved are defined as non-relevant. Defined sets of relevant and non-relevant documents make it possible to evaluate the performance of a search engine by calculating various quantitative performance measures. Such measures i
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