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Thermal Modeling of a Multilayer Integrated LC Filter for Temperature Distribution Calculation

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Engineering（科研） 2019年第11期11卷 759-767页

作者： Somo Coulibaly Diby kadjo Ambroise Loum Georges Institut National Polytechnique UMRI EEA (LARIT-SISE) Yamoussoukro Ivory Coast Université Félix Houphouët-Boigny SSMT (LPMCT) Abidjan Ivory Coast

Thermal behavior of integrated passive components has become an important issue when designing these components. This paper presents the thermal modeling of a multilayer integrated LC filter used in DC-DC step-down converter for temperature distribution calculation. The approach used for this analysis is based on thermal equivalent circuit. Temperature distribution is obtained from algebraic equation, which is in vector and matrix form. The results of analytical calculation are compared with simulation results from finite element method. These results showed a good correlation.

关键词： Thermal Modeling Integrated LC Filter Temperature Distribution F. E. M. Simulation

Non-Cooperative Spectrum Sensing Based on Cyclostationary Model of Digital Signals in the Context of Cognitive Radio

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Engineering（科研） 2021年第1期13卷 56-70页

作者： Jean-Marie kadjo Raoule Agoua Aliou Bamba Adama Konaté Olivier Asseu LASTIC ESATIC Abidjan C&#244 te d’Ivoire

This paper addresses the problem of the opportunistic spectrum access in Cognitive Radio. Indeed, most spectrum sensing algorithms suffer from a high computational cost to achieve the detection process. They need a prior knowledge of signal characteristics and present a bad performance in low Signal to Noise Ratio (SNR) environment. The choice of the optimal detection threshold is another issue for these spectrum sensing algorithms. To overcome the limits of spectrum detectors, we propose in this paper, a blind detection method based on the cyclostationary features of communication signals. Our detector evaluates the level of hidden periodicity contained in the observed signal to make decision on the state of a bandwidth. In order to reduce the computational cost, we take advantage of the FFT Accumulation Method to estimate the cyclic spectrum of the observed signal. Then, we generate the Cyclic Domain Profile of the cyclic spectrum which allows us to evaluate the level of the hidden periodicity in the signal. This level of periodicity is quantified through the crest factor of Cyclic Domain Profile, which represents the decision statistic of the proposed detector. We have established the analytic expression of the optimal threshold of the detection and the probability of detection to evaluate the performance of the proposed detector. Simulation results show that the proposed detector is able to detect the presence of a communication signal on a bandwidth in a very low SNR scenario.

关键词： Spectrum Sensing Cyclostaionarity FFT Accumulation Method Cyclic Spectrum Spectrum Coherence Cognitive Radio

Dynamic Spectrum Access Protocol for the Digital Dividend

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Circuits and Systems 2016年第13期7卷 4124-4144页

作者： Raoul Zamblé Raymond Gbégbé Jean-Marie kadjo Olivier Asseu Pacôme Brou Ecole Supérieure Africaine des Technologies de l’Information et de la Communication (ESATIC) Abidjan Cote d’Ivoire Institut National Polytechnique Houphouet Boigny (INPHB) Yamoussoukro Cote d’Ivoire

It is not more and more, easy to satisfy the important and growing spectrum demands in the context of the static conventional policy spectrum allocation. Therefore, to find a suitable solution to this problem, we are to days observing the apparition of flexible dynamic spectrum allocation methods. These methods that ought to improve more significantly the spectrum use have gained much interest. In fact, the digital dividend due to the change-over from the analog television to the digital terrestrial television must be efficiently used. So the Dynamic Spectrum Access (DSA) can potentially play a key role in shaping the future digital dividend use. In the DSA, two kinds of users or networks coexist on different channels. The first one, known as the primary user, accesses to a channel with high priority;and the second one, known as secondary user has a low priority. This paper presents a dynamic spectrum access protocol based on an auction framework. Our protocol is an interesting tool that allows the networks to bid and obtain on the available spectrum, the rights to be primary and secondary users according their valuations and traffic needs. Based on certain offers, our protocol selects primary and secondary users for each idle channel in order to realize the maximum economic for the regulator or social benefits. We deal with the case in which the offers of the networks are independent one another even if they will share the same channels. We design an algorithm in accordance with our dynamic spectrum access protocol. The algorithm is used here to find an optimal solution to the access allocation problem, specifically to digital dividend. Finally, the results in the numeric section, regarding the three suggested scenarios, show that the proposed dynamic spectrum access protocol is viable. The algorithm is able to eliminate all non-compliant bidders for the available spectrum sharing. We notice that the revenue or social benefits of the regulator is maximized when we

关键词： Dynamic Spectrum Access Protocol Centralized Spectrum Sharing Spectrum Auctions Digital Dividend

Simulation of the Dynamics of Land Cover and Land Use in the Lobo River Watershed Upstream of Nibéhibé(Center-West of Côte d’Ivoire)

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Journal of Geographic Information System 2020年第5期12卷 519-530页

作者： Kouakou Hervé Kouassi Arthur Brice Konan-Waidhet Affoué Berth Yao Berenger Koffi Ettibou Damase kadjo Laboratory of Science and Technology of Environment Jean Lorougnon Guédé University Daloa C&#244 te d’Ivoire

From medium-resolution satellite images (Landsat TM, ETM+ and OLI), the spatial dynamics of land cover and land use are highlighted. The objective of this study is to quantify the evolution of land use in the watershed of the Lobo River upstream of Nibéhibé between 1986 and 2019 in order to analyze the impacts of human activities on the landscape. The study method was based, on the one hand, on the processing of satellite images, for the analysis of the dynamics of land use and, on the other hand, on the CA-Markov model, for the prediction of land use by 2050. It emerged from this study that the land use maps produced made it possible to highlight the spatio-temporal dynamics of land use on the basin. For the period from 1986 to 2019, there is a decrease in the area of forests in favor of built-bare ground and crops and fallows. A land use scenario for the years 2019 and 2050 was simulated with an accuracy of 87.11%. The regressive trend in forests seems to continue in the future with current land use practices.

关键词： Satellite Image Land Cover and Land Use Space-Time Modeling Lobo

Improving Radar Rainfall Estimation by Accounting for Microphysical Processes Using a Micro Rain Radar in West Africa

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Atmospheric and Climate Sciences 2021年第4期11卷 658-688页

作者： Ghislain Kouadio Eric-Pascal Zahiri Modeste Kacou Augustin kadjo Koffi Abé Delfin Ochou Paul Assamoi Laboratoire de Physique de l’Atmosphère et de Mécanique des Fluides (LAPA-MF) UFR SSMT Université Félix Houphou&#235 t-Boigny Abidjan C&#244 te d’Ivoire

This study evaluates the improvement of the radar Quantitative Precipitation Estimation (QPE) by involving microphysical processes in the determination of Z-R algorithms. Within the framework of the AMMA campaign, measurements of an X-band radar (Xport), a vertical pointing Micro Rain Radar (MRR) to investigate microphysical processes and a dense network of rain gauges deployed in Northern Benin (West Africa) in 2006 and 2007 were used as support to establish such estimators and evaluate their performance compared to other estimators in the literature. By carefully considering and correcting MRR attenuation and calibration issues, the Z-R estimator developed with the contribution of microphysical processes and non-linear least-squares adjustment proves to be more efficient for quantitative rainfall estimation and produces the best statistic scores than other optimal Z-R algorithms in the literature. We also find that it gives results comparable to some polarimetric algorithms including microphysical information through DSD integrated parameter retrievals.

关键词： Drop Distribution Micro Rain Radar Calibration Microphysical Processes Z-R Relationships Rainfall Estimation

Mechanistic Model versus Artificial Neural Network Model of a Single-Cell PEMFC

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Engineering（科研） 2014年第8期6卷 418-426页

作者： Brigitte Grondin-Perez Sébastien Roche Carole Lebreton Michel Benne Cédric Damour Jean-Jacques Amangoua kadjo University of La Reunion Saint-Denis France

Model-based controllers can significantly improve the performance of Proton Exchange Membrane Fuel Cell (PEMFC) systems. However, the complexity of these strategies constraints large scale implementation. In this work, with a view to reduce complexity without affecting performance, two different modeling approaches of a single-cell PEMFC are investigated. A mechanistic model, describing all internal phenomena in a single-cell, and an artificial neural network (ANN) model are tested. To perform this work, databases are measured on a pilot plant. The identification of the two models involves the optimization of the operating conditions in order to build rich databases. The two different models benefits and drawbacks are pointed out using statistical error criteria. Regarding model-based control approach, the computational time of these models is compared during the validation step.

关键词： Mechanistic Model Artificial Neural Network Model Proton Exchange Membrane Fuel Cell Real-Time Experiment

Study of the Physico-Chemical Characteristics of Methacompost from a Poultry Company in Ivory Coast: Test for Growing Big Sun Chilli

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Journal of Agricultural Chemistry and Environment 2023年第4期12卷 335-350页

作者： Ahissan Donatien Ehouman Adjoumani Rodrigue Kouakou Gbangbo Remis Konan kadjo Benjamin Abi Ahou Adeline Estelle N’Dri Benjamin Yao Laboratoire de Thermodynamique et Physico-Chimie du Milieu Université Nangui Abrogoua Abidjan C&ocircte d’Ivoire école Doctorale Polytechnique Institut National Polytechnique Félix Houphou&eumlt-Boigny Yamoussoukro C&ocircte d’Ivoire Centre d’Excellence Africain Pour la Valorisation des Déchets en Produits à Haute Valeur Ajoutée (CEA-VALOPRO) Institut National Polytechnique Félix Houphou&eumlt-Boigny (INP-HB) Yamoussoukro C&ocircte d’Ivoire Ecole Supérieur Saint Chalmel de Yopougon-Abidjan Grande Ecole Privé Abidjan C&ocircte d’Ivoire

The objective of this work was to determine the suitability of poultry methacompost from the 2nd methanizer of the BRIN FOUNDATION in Yaokokoroko (Bondoukou, Côte d’Ivoire), to be used in the improvement of soil fertility. The methacompost studied has a C/N ratio = 17.26, which could characterize a stable methacompost with high amending power. It also contains mineral elements Nitrogen (N) = 0.68% DM;Phosphorus (P) = 0.084% DM;Potassium (K) = 0.67% DM;Calcium (Ca) = 0.65% DM;Magnesium (Mg) = 0.15% DM. red in the standard relating to the organic amendments (NFU 44-051). The methacompost has fertilizing and amending properties and could not present any risk for vegetation and soils.

关键词： Poultry Methacompost Methanization Digestate Trace Metal Elements (TME) Organic Amendment Poultry Farm

Introducing New Peptide Extracts from Saccharomyces cerevisiae and Achatina achatina Fluids with Strong Inhibitory Activities on Human α-Amylase

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Journal of Biosciences and Medicines 2022年第11期10卷 226-239页

作者： Ehuie Micaël Bédikou Fafadzi Charlotte Ehon Chadon Christelle Assémian Djary Michel Koffi Bomo Mondesire kadjo Allah Antoine Assamoi Sebastien Niamké Department of Food Biotechnology Laboratory of Biotechnology Agriculture and Biological Resources Valorization Training and Research Unit in Biosciences University Félix Houphou&euml t-Boigny Abidjan C&ocirc te d’Ivoire

This study aimed at exploring for new natural peptides with strong inhibitory capabilities on α-amylase, the main metabolic enzyme that regulates mellitus diabetes, in order to contribute in controlling this global pandemic. It has consisted in heat shock (to 60°C, 70°C, 80°C, 90°C and 100°C for 10, 20 and 30 minutes) of crude proteins extracted from biomass and extracellular parts of Saccharomyces cerevisiae under cultivation, and from the digestive fluid of the giant snail Achatina achatina, and in-vitro assays of the resulting solutions, as effectors, in human α-amylase catalyzing reactions. The results showed that whatever the temperature and time of treatment, an increase (from 2.65 to 3.98-fold) in proteins concentration was noticed. When blended up to 75 microliters in reaction mixtures, the three peptide extracts showed beyond 11% of inhibition of initial α-amylase activity. By reducing samples volume, only 5 microliters of the studied peptide extracts representing 4.70 μg of S. cerevisiae biomass peptides, 0.55 μg of S. cerevisiae extracellular peptides or 1.05 μg of peptides from the digestive fluid A. achatina were quite sufficient to induce complete (100%) inhibition of the human α-amylase activity. Compared to the inhibitory effect obtained from 2.50 μg of acarbose, a renowned antidiabetic, the studied peptide effectors showed more pronounced inhibitory activities. So, we can positively state that S. cerevisiae as well as A. achatina are both capable of synthesizing proteins made up of small inhibitory peptides which deserve purification and structural analysis for potential exploitation as healthy antidiabetic drugs.

关键词： α-Amylase Inhibitors Healthy Antidiabetics Peptide Drugs Saccharomyces cerevisiae Achatina achatina

Capacity Development of National Reference Centers (NRC) to Face the Challenges of Emerging Infections in Côte d’Ivoire

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Open Journal of Internal Medicine 2023年第3期13卷 181-208页

作者： Diané Kouao Maxime Adjogoua Edgard Valery Coulibaly Ngolo Antoine Marie-David kadjo A. Hervé N’guessan Kouassi Raymond Sylla Yahaya Anne Blessa Jean Claude Beourou Sylvain Guessennd-Kouadio Aya Nathalie Dosso Mireille Tiembré Issiaka Pasteur Institute of Cô te d’Ivoire Abidjan C&ocircte d’Ivoire Biological Resource Center Abidjan C&ocircte d’Ivoire Epidemic Virus Department Abidjan C&ocircte d’Ivoire Molecular Biology Platform Abidjan C&ocircte d’Ivoire Mycobacterium Tuberculosis Unit Abidjan C&ocircte d’Ivoire Clinical Bacteriology Unit Abidjan C&ocircte d’Ivoire Department of Mycology Malariology Abidjan C&ocircte d’Ivoire Antibiotics Unit Abidjan C&ocircte d’Ivoire Department of Public Health UFR Medical Science Université Félix Houphou&eumlt-Boigny Abidjan C&ocircte d’Ivoire

Background: Some national and international strategies for the detection and prevention of emerging infectious diseases have been established across sectors. The capacity to carry out these tasks varies from country to country, and that remains largely undervalued. The Pasteur Institute of C?te d’Ivoire has created and implemented the capacity of national reference centers to fight against emerging and other infectious diseases. Objective: Show on the one hand the strategies used to develop the National Reference Centers and the IPCI and on the other hand the results obtained by performing these strategies. Method: Datas collection by documentary analysis (published scientific articles and grey literature) was done on Google Scholar, PUBMED and institutional reference documents. The documentary research was carried out to have a better understanding of strategies used to create and develop the NRCs in microbiology of communicable diseases. Results: Seven integrated strategies were launched: 1-training and workforce development;2-investigation of epidemics or public health events;3-strengthening laboratory epidemiological research;4-strengthening surveillance systems;5-improving communication with partners and stakeholders;6-building national and international collaborations;and 7-strengthening technical and technological platforms. In two decades, the number of researchers has risen from 10 in 2004 to ninety (90) in 2021, with 12 senior researchers and 32 junior researchers. A number of health service staff had attended a qualifying training course, 27 investigations into outbreaks and other public health events had been carried out, 18 short-term research projects had been launched, major surveillance programs and epidemiological research efforts on vector-borne, food-borne and nosocomial infections had begun, and several scientific manuscripts had been published or were edited in the writting press. Conclusion: The Ivorian experience shows that, with concerted eff

关键词： Evaluation Communicable Diseases National Reference Centerorlaboratorie Capacity Development Côte d’Ivoire