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442 results on '"Cherkaoui, Omar"'

6. A Compact Two-Port Semi-flexible Dual-Band Circularly Polarized MIMO Antenna Structure for Millimeter-Wave 26/31 GHz 5G Applications

Author

Douhi, Saïd, Eddiai, Adil, Islam, Tanvir, Das, Sudipta, Cherkaoui, Omar, Mazroui, M’hammed, Celebi, Emre, Series Editor, Chen, Jingdong, Series Editor, Gopi, E. S., Series Editor, Neustein, Amy, Series Editor, Liotta, Antonio, Series Editor, Di Mauro, Mario, Series Editor, El Ghzaoui, Mohammed, editor, Das, Sudipta, editor, Samudrala, Varakumari, editor, and Medikondu, Nageswara Rao, editor

Published
2024
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7. Copper Removal from Aqueous Solutions Using Functionalized Polyacrylonitrile Fibers and Antibacterial Activity

Author

Saadouni, Meriem, Nadi, Ayoub, Moukhfi, Fatima Zahra, Bouhaj, Youness, Cherkaoui, Omar, Tahiri, Mohamed, Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Babay, Amel, editor, Cheriaa, Rim, editor, and Zouari, Riadh, editor

Published
2024
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8. A New Protective Textile Based on the Xerogel as Charge for Poly-Cotton Fabric

Author

Assal, Mohamed, El Wazna, Mohamed, El Bouchti, Mehdi, El Bouari, Abdeslam, Cherkaoui, Omar, Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Babay, Amel, editor, Cheriaa, Rim, editor, and Zouari, Riadh, editor

Published
2024
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9. Development of a Biobased Conductive Ink Formulation and Its Application Through Screen Printing for Electronic Textile Development

Author

Batine, Assia, Boumegnane, Abdelkrim, Nadi, Ayoub, Cherkaoui, Omar, Tahiri, Mohamed, Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Babay, Amel, editor, Cheriaa, Rim, editor, and Zouari, Riadh, editor

Published
2024
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10. Thermal Behavior of Polymer Pellets of Virgin Polyester Compared to Recycled Polyester

Author

Abdel-Mouttalib, Kaoutar, Nadi, Ayoub, Tetouani, Samir, Hajjaji, Abdelowahed, Cherkaoui, Omar, Touhtouh, Samira, Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Babay, Amel, editor, Cheriaa, Rim, editor, and Zouari, Riadh, editor

Published
2024
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11. Characterization and Manufacturing of 3D Warp Interlock Fabrics with Moroccan Sisal Yarns

Author

Samouh, Zineb, Cherkaoui, Omar, Soulat, Damien, Labanieh, Ahmad Rashed, Boussu, François, El Moznine, Reddad, Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Koubaa, Ahmed, editor, Leblanc, Nathalie, editor, and Ragoubi, Mohamed, editor

Published
2024
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24. A wideband flexible antenna utilizing PMMA/PVDF‐HFP/PZT polymer composite film and silver‐based conductive ink for wearable applications.

Author

Douhi, Saïd, Boumegnane, Abdelkrim, Chakhchaoui, Nabil, Eddiai, Adil, Cherkaoui, Omar, and Mazroui, M'hammed

Subjects
CONDUCTIVE ink, ELECTRONIC equipment, FLEXIBLE electronics, ANTENNAS (Electronics), BACTERIAL contamination
Abstract

The relentless drive towards miniaturization and seamless integration of electronic components in wireless communications and wearable devices has significantly increased the demand for flexible, cost‐effective composites with high dielectric constants and low losses. This study presents a wideband, low‐profile, and flexible antenna with excellent on body radiation performance for wearable applications. The antenna is designed using a low‐loss composite film based on PMMA‐PVDF‐HFP‐PZT and silver‐based ink. The proposed flexible antenna exhibits a wide bandwidth of 132.16% with a voltage standing wave ratio (VSWR) of less than two. It achieves a peak gain of 2.76 dBi at 2.92 GHz and maintains a maximum radiation efficiency of 80% across the 1.26–6.17 GHz frequency range. These characteristics demonstrate that the antenna is an effective solution for achieving high data rates and reliable communication links. The antenna's suitability for wearable applications is assessed by testing it on a simulated human body and analyzing its behavior under physical deformation. The results under bending showed only a minimal frequency detuning, which is negligible given the antenna's wide operational bandwidth. The specific absorption rate (SAR) analysis shows values of approximately 1.88 W/kg at 3.5 GHz with an input power of 0.5 W, and 0.279 W/kg at 5.8 GHz with an input power of 0.45 W, which complies with established safety limits for exposure. Overall, these results suggest that the proposed antenna is a viable solution for integration into wearable medical devices, such as a doctor's chest badge, enabling noncontact interactions and reducing the risk of bacterial contamination. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Rheological Properties and Inkjet Printability of a Green Silver-Based Conductive Ink for Wearable Flexible Textile Antennas.

Author

Boumegnane, Abdelkrim, Douhi, Said, Batine, Assia, Dormois, Thibault, Cochrane, Cédric, Nadi, Ayoub, Cherkaoui, Omar, and Tahiri, Mohamed

Subjects
INK, CONDUCTIVE ink, RHEOLOGY, ANTENNAS (Electronics), TEXTILE printing, TEXTILES, ELECTRONIC circuits
Abstract

The development of e-textiles necessitates the creation of highly conductive inks that are compatible with precise inkjet printing, which remains a key challenge. This work presents an innovative, syringe-based method to optimize a novel bio-sourced silver ink for inkjet printing on textiles. We investigate the relationships between inks' composition, rheological properties, and printing behavior, ultimately assessing the electrical performance of the fabricated circuits. Using Na–alginate and polyethylene glycol (PEG) as the suspension matrix, we demonstrate their viscosity depends on the component ratios. Rheological control of the silver nanoparticle-laden ink has become paramount for uniform printing on textiles. A specific formulation (3 wt.% AgNPs, 20 wt.% Na–alginate, 40 wt.% PEG, and 40 wt.% solvent) exhibits the optimal rheology, enabling the printing of 0.1 mm thick conductive lines with a low resistivity (8 × 10−3 Ω/cm). Our findings pave the way for designing eco-friendly ink formulations that are suitable for inkjet printing flexible antennas and other electronic circuits onto textiles, opening up exciting possibilities for the next generation of E-textiles. [ABSTRACT FROM AUTHOR]

Published
2024
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44. FlowME: Lattice-based Traffic Measurement

Author

Valtchev, Petko, Mounaouar, Omar, Cherkaoui, Omar, Dimitrov, Alexandar, and Marchand, Laurent

Subjects
Computer Science - Networking and Internet Architecture, C.4, C.2.3
Abstract

Flow-based traffic measurement is a very challenging problem: Managing counters for each individual traffic flow in hardware resources knowingly struggle to scale with high-speed links. In this paper we propose a novel lattice theory-based approach that improves flow-based measurement performances and scales by keeping the number of the maintained hardware counters to a minimum (result mathematically established in the paper). The crucial contribution of the lattice is to map the computational semantics of the packet processing to user requests for traffic measurement thus allowing for a better-informed and focused counter assignment. An implementation over an Openflow switch, FlowME, was developed and evaluated upon its memory usage, performance overhead, and processing effort to generate the minimal solution. Experimental results indicate a significant decrease in resource consumption.

Published
2012

50. Improving Real-Time Bidding Using a Constrained Markov Decision Process

Author

Du, Manxing, Sassioui, Redouane, Varisteas, Georgios, State, Radu, Brorsson, Mats, Cherkaoui, Omar, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Cong, Gao, editor, Peng, Wen-Chih, editor, Zhang, Wei Emma, editor, Li, Chengliang, editor, and Sun, Aixin, editor

Published
2017
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