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Papers by Pape Cheikh Ndiaye

Open Journal of Internal Medicine, 2020

Rosai Dorfman’s Disease (RDD) Destombes also called sinus histiocytosis with massive lymphadenopa... more Rosai Dorfman’s Disease (RDD) Destombes also called sinus histiocytosis with massive lymphadenopathy is a lymphoproliferative pathology usually benign, of unknown etiology, and of low incidence. It is a rare, but well-defined clinicopathological entity, which predominantly affects children and adolescents without distinction of gender or race. It manifests itself generally by bulky cervical lymphadenopathies, most often bilateral, painless, of benign but persistent evolution and a long-term fever associated with a non-specific biological inflammatory syndrome. Extra lymph node locations are described in association with lymph node involvement or isolation. The definitive diagnosis of Rosai Dorfman’s disease is histological, characterized by histiocytic infiltration with emperipolesis essentially of lymphocytes. The etiopathogenesis of the condition remains unclear, based on infectious and immunological hypotheses without clear evidence. The management is not well codified, it combin...

International Journal of Medical Reviews and Case Reports, 2020

Sciences Appliquees Et De L Ingenieur, Jun 6, 2014

Cet article présente une approche distribuée collaborative pour un contrôle décentralisé de la ge... more Cet article présente une approche distribuée collaborative pour un contrôle décentralisé de la gestion du réseau électrique interconnecté de la Société Nationale d'Electricité au Sénégal (SENELEC). Il s'agit de la conception et de la simulation d'un système auto-adaptatif capable de faire face aux situations changeantes et imprévisibles qu'exige la gestion d'un réseau électrique complexe. Autrement dit un système auto-organisé capable de proposer un agencement optimal des sources d'énergie électrique du réseau interconnecté de la SENELEC. Compte tenu de la complexité de la gestion du réseau, le contrôle est décentralisé au niveau de différents agents sources de production et d'agents départ. Après avoir montré le besoin de suivre « intelligemment » le système électrique par un modèle de système distribué en interaction, ce papier présente d'abord brièvement les enjeux technico-économiques du réseau et s'intéresse ensuite à la modélisation multi-agents du système de gestion de l'énergie, avant d'exposer enfin les résultats obtenus par la plateforme mise en place. Ces résultats mettent en évidence la possibilité d'optimisation du coût de production du parc énergétique, ainsi qu'en termes de réduction des gaz à effet de serre. Ils montrent également l'existence de slacks et la non soutenabilité du réseau de SENELEC qui nécessite des procédés alternatifs.

IFAC Proceedings Volumes, 2009

IEEE Transactions on Automation Science and Engineering, 2011

This paper is devoted to multisource renewable energy systems. A modeling approach is proposed th... more This paper is devoted to multisource renewable energy systems. A modeling approach is proposed that brings a detailed understanding of the coupling and uncoupling of DC/DC power converters on a DC bus including the regulation of the DC bus voltage and the driving of current provided by each converter to the load. This approach is systematic and the resulting average state-space model depends only on the number and characteristics of the converters. The model has a generic expression the parameters of which switch according to the converters coupling and uncoupling on the DC bus. The model has been identified and validated with an experimental device developed by GREAH Research Group for the optimization of energies transfers for multisource renewable energy systems. Our approach can be used in the context of power management as support for performance evaluation (converter design, supervisory control design, and so on). Note to Practitioners-Multisources renewable energy systems coupled on a DC bus are not usual equipments, and experimentation with such equipments are difficult to carry out and time consuming. These systems are fragile (particularly the converters which are sensible to short circuits and surcharges), dangerous with potential risk for the practitioners (particularly for DC bus with high-power transfers). The proposed hybrid model can be used as a numerical simulator for multisources renewable energy systems. This model is an easy and low cost tool for designing, validating and evaluating the performances of the control strategies developed for the optimization of energy transfers. Moreover, it is also helpful in the design of the systems structure (sources number and converters characteristics). As a consequence, it could be considered as an integrated numerical solution for the study of power management. This solution is systematic and also portable with respect to the technical characteristics of the components.

Global and Planetary Change, 2010

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2011

PurposeThe purpose of this paper is to describe a two‐level hierarchical control strategy for ele... more PurposeThe purpose of this paper is to describe a two‐level hierarchical control strategy for electrical energy transfers in multisource renewable energy systems. The aim of the control design is to perform the energy transfers, according to the sources power variations and the load characteristics.Design/methodology/approachThe controller determines the operating mode of the multisource renewable energy system and the power ratio provided by each source to satisfy the load demand. The study is based on an accurate model of the DC/DC converters coupled on the DC bus. The performance of the controller is compared with the usual method based on the measurements of the system variables with sensors (solar radiation, shaft speed, voltages, and currents).FindingsThe proposed method does not need extra sensors to measure the available power for each source.Research limitations/implicationsThe method is developed for an hybrid system with two sources (photovoltaic and lead‐acid battery ban...

Microbes and Infection, 2006

In areas where malaria is endemic, infected individuals generally harbor a mixture of genetically... more In areas where malaria is endemic, infected individuals generally harbor a mixture of genetically distinct Plasmodium falciparum parasite populations. For the first time, we studied temporal variations of blood parasite densities and circulating genotypes in asymptomatic Senegalese children, at time intervals as short as 4-12 h. Twenty-one Senegalese children, presenting with an asymptomatic P. falciparum infection, were sampled eight times within three days. Parasite density was assessed by thick blood smears, and all infecting genotypes were quantified by the fragment-analysis method. Parasite densities showed dramatic fluctuations up to a 1 to 1,000 ratio, with at least one peak of parasite density. Polyclonal infections were detected in all children, with a multiplicity of infection of 5.2-6.8 genotypes per child. A single sample never reflected the full complexity of the parasite populations hosted by a given individual. Genotypes with different behaviors were detected in all children, some genotypes undergoing major fluctuations, while others were highly stable during the follow-up. A single peripheral blood sampling does not reflect the total parasite load. Repeated sampling is needed to have a more detailed scheme of parasite population dynamics and a better knowledge of the true complexity of an infection.