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Contribution to S-EMG Signal Compression in 1D by the Combination of the Modified Discrete Wavelet Packet Transform (MDWPT) and the Discrete Cosine Transform (DCT)

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Journal of Signal and Information Processing 2020年第3期11卷 35-57页

作者： Colince Welba Aimé Joseph Oyobé Okassa Pascal Ntsama Eloundou pierre ele Department of Fundamental Science Faculty of Mines and Petroleum Industries University of Maroua Maroua Cameroon School of Engineering of Masuku Franceville Gabon Physics Department Faculty of Sciences University of Ngaoundere Ngaoundere Cameroon electrical Engineering and Telecommunications Department National Advanced School of EngineeringUniversity of Yaounde 1 Ya-oundé Cameroon

A new Modified Discrete Wavelets Packets Transform (MDWPT) based method for the compression of Surface EMG signal (s-EMG) data is presented. A Modified Discrete Wavelets Packets Transform (MDWPT) is applied to the digitized s-EMG signal. A Discrete Cosine Transforms (DCT) is applied to the MDWPT coefficients (only on detail coefficients). The MDWPT+ DCT coefficients are quantized with a Uniform Scalar Dead-Zone Quantizer (USDZQ). An arithmetic coder is employed for the entropy coding of symbol streams. The proposed approach was tested on more than 35 actuals S-EMG signals divided into three categories. The proposed approach was evaluated by the following parameters: Compression Factor (CF), Signal to Noise Ratio (SNR), Percent Root mean square Difference (PRD), Mean Frequency Distortion (MFD) and the Mean Square Error (MSE). Simulation results show that the proposed coding algorithm outperforms some recently developed s-EMG compression algorithms.

关键词： S-EMG Compression MDWPT DCT Arithmetic Coding Uniform Scalar Dead-Zone Quantizer (USDZQ)

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Enhanced Vibrating Particles System Algorithm for Parameters Estimation of Photovoltaic System

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Journal of Power and Energy Engineering 2019年第8期7卷 1-26页

作者： Patrick Juvet Gnetchejo Salomé Ndjakomo Essiane pierre ele René Wamkeue Daniel Mbadjoun Wapet Steve Perabi Ngoffe Laboratory of Technologies and Applied Sciences University of Douala Douala Cameroon Higher Technical Teacher Training College of Ebolowa University of Yaoundé Yaoundé Cameroon electrical Engineering and Telecommunications Department National Advanced School of Engineering University of Yaoundé Yaoundé Cameroon School of Engineering University of Quebec in Abitibi-Temiscamingue (UQAT) Rouyn-Noranda QC Canada

To evaluate the performance of a photovoltaic panel, several parameters must be extracted from the photovoltaic. These parameters are very important for the evaluation, monitoring and optimization of photovoltaic. Among the methods developed to extract photovoltaic parameters from current-voltage (I-V) characteristic curve, metaheuristic algorithms are the most used nowadays. A new metaheuristic algorithm namely enhanced vibrating particles system algorithm is presented here to extract the best values of parameters of a photovoltaic cell. Five recent algorithms (grey wolf optimization (GWO), moth-flame optimization algorithm (MFOA), multi-verse optimizer (MVO), whale optimization algorithm (WAO), salp swarm-inspired algorithm (SSA)) are also implemented on the same computer. Enhanced vibrating particles system is inspired by the free vibration of the single degree of freedom systems with viscous damping. To extract the photovoltaic parameters using enhanced vibrating particles system algorithm, the problem can be set as an optimization problem with the objective to minimize the difference between measured and estimated current. Four case studies have been implemented here. The results and comparison with other methods exhibit high accuracy and validity of the proposed enhanced vibrating particles system algorithm to extract parameters of a photovoltaic cell and module.

关键词： PV Cell Modeling Vibrating Particles System Parameter Estimation Single/Double Diode Model

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Characterization of the Modified Lifting Scheme Compression Method of EMG Signals

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通讯和计算机（中英文版） 2011年第11期8卷 1013-1021页

作者： ele pierre Ntsama Eloundou Pascal Tonye Emmanuel electrical Engineering and Telecommunications Department National Advanced School of Engineering University of Yaounde 1 in Cameroon PO Box 8698 Douala Cameroon Physics Department Faculty of Sciences University of Ngaoundere in Cameroon PO Box 454 Ngaoundere Cameroon electrical Engineering and Telecommunications Department National Advanced School of Engineering University of Yaounde 1 in Cameroon PO Box 8390 Yaounde Cameroon

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Dual-ligand and hard-soft-acid-base strategies to optimize metal-organic framework nanocrystals for stable electrochemical cycling performance

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National Science Review 2022年第7期9卷 88-96页

作者： Shasha Zheng Yan Sun Huaiguo Xue pierre Braunstein Wei Huang Huan Pang School of Chemistry and Chemical Engineering Yangzhou University Institut de Chimie UMR 7177 Universite′ de StrasbourgCNRS State Key Laboratory of Organic electronics and Information Displays and Institute of Advanced Materials (IAM)Nanjing University of Posts and Telecommunications Frontiers Science Center for Flexible electronics (FSCFE) MIIT Key Laboratory of Flexible Electronics (KLo FE)Northwestern Polytechnical University

Most metal-organic frameworks(MOFs) hardly maintain their physical and chemical properties after exposure to acidic,neutral,or alkaline aqueous solutions,resulting in insufficient stability,therefore limiting their ***,the design and synthesis of stable size/morphology-controlled MOF nanocrystals is critical but *** this study,dual-ligand and hard-soft-acid-base strategies were used to fabricate a variety of 3D pillared-layer [Ni(thiophene-2,5-dicarboxylate)(4,4’-bipyridine)]nMOF nanocrystals(1D nanofibers,2D nanosheets and 3D aggregates) with controllable morphology by varying the concentration of 4,4’-bipyridine and thus controlling the crystal growth *** to the shorter ion diffusion length,enhanced ele ctron/ion transfer and strong interactions between thiophene-2,5-dicarboxylate and4,4’-bipyridine,the 2D nanosheets showed much larger specific capacitance than 1D nanofibers and 3D aggregates.A single device with an output voltage as high as 3.0 V and exceptional cycling performance(95% of retention after 5000 cycles at 3 mA cm-2) was realized by configuring two aqueous asymmetric super capacitive devices in *** excellent cycling property and charge-discharge mechanism are consistent with the hard-soft-acid-base theory.

关键词： metal-organic framework dual ligand hard-soft-acid-base electrochemical energy storage supercapacitor

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