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Common Control Channel Allocation in Cognitive Radio Networks through UWB Communication
Masri, Ahmed M.,Chiasserini, Carla-Fabiana,Casetti, Claudio,Perotti, Alberto The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.6
The implementation of a common control channel is one of the most challenging issues in cognitive radio networks, since a fully reliable control channel cannot be created without reserving bandwidth specifically for this purpose. In this paper, we investigate a promising solution that exploits the ultra wide band (UWB) technology to let cognitive radio nodes discover each other and exchange control information for establishing a communication link. The contribution of this paper is threefold: (i) We define the communication protocol needed to let cognitive radio nodes discover each other and exchange control information for link set up, (ii) we overcome the gap in coverage, which typically exists between UWB and long-medium range technologies, by using multi-hop communication, (iii) we evaluate the performance of our approach by adopting an accurate channel model and show its benefits with respect to an in-band signaling solution.
Common Control Channel Allocation in Cognitive Radio Networks through UWB Communication
Ahmed M. Masri,Carla-Fabiana Chiasserini,Claudio Casetti,Alberto Perotti 한국통신학회 2012 Journal of communications and networks Vol.14 No.6
The implementation of a common control channel is one of the most challenging issues in cognitive radio networks, since a fully reliable control channel cannot be created without reserving bandwidth specifically for this purpose. In this paper, we investigate a promising solution that exploits the ultra wide band (UWB) technology to let cognitive radio nodes discover each other and exchange control information for establishing a communication link. The contribution of this paper is threefold: (i) We define the communication protocol needed to let cognitive radio nodes discover each other and exchange control information for link set up,(ii) we overcome the gap in coverage, which typically exists between UWB and long-medium range technologies, by using multi-hop communication, (iii) we evaluate the performance of our approach by adopting an accurate channel model and show its benefits with respect to an in-band signaling solution.
Medhat M. Hassan,E.S. Fathy,Raouf O. Aly,S.E. Abdel Aal,Ahmed M. El-Masry 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Waste rubber (WR) powder was introduced in a two-roll mill in the presence of various ratios of curatives to develop sheets of devulcanized waste rubber (DWR). The product has been investigated by FTIR, TGA and SEM. A thermoplastic elastomer (TPE) was prepared by blending the obtained DWR with high density polyethylene (HDPE) at different feed ratios under conditions of gamma irradiation, 25, 50, 100, and 150 kGy. The mechanical parameters of the blend: tensile strength, elongation at break, and hardness (Shore D) were studied. In addition, blend characterization using FTIR spectra, gel fraction, TGA and SEM was discussed.
Medhat M. Hassan,E.S. Fathy,Raouf O. Aly,S.E. Abdel Aal,Ahmed M. El-Masry 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Waste rubber (WR) powder was introduced in a two-roll mill in the presence of various ratios of curatives to develop sheets of devulcanized waste rubber (DWR). The selected product was investigated by FTIR, TGA and SEM. In a roll mill and hot press, styrene butadiene rubber (SBR) gum was differentially replaced by DWR feed ratios, and thereafter irradiated with gamma rays. The mechanical parameters of the developed blend were examined. Oil resistance and thermogravemetric behavior were discussed. Remarked improvement in the mechanical, thermal and physical parameters of SBR was generally determined by the incorporation of DWR and gamma irradiation.
Fekri Abdulraqeb Ahmed Ali,Javed Alam,Arun Kumar Shukla,Mansour Alhoshan,Jamal M. Khaled,Waheed A. Al-Masry,Naiyaf S. Alharbi,Manawwer Alam 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Biofouling leads to degradation of membrane performance characteristics, including permeability,selectivity, and long-term stability. In this study, silver-doped graphene oxide (GO) was employed as ananoadditive to enhance the biofouling resistance of thin-film nanocomposite (TFN) membranes viainterfacial polymerization. Ag functionalization on GO sheets was carried out by a reduction reaction. Electron microscopy, Raman spectroscopy, and X-ray diffraction analyses were conducted to evaluate Agattachment on GO. According to zeta potential and contact angle measurements as well as atomic forcemicroscopy results, GO-Ag-incorporated TFN membranes showed a high negative charge, hydrophilicity,and a smooth surface. Bovine serum albumin protein and Escherichia coli (E. coli) were used as modelfouling agents to demonstrate the antifouling characteristics of the membranes. The TFN membranecontaining 80 ppm of GO-Ag had a high waterflux recovery ratio (89%) and low irreversible resistance(10%) after hydraulic washing. The biofouling resistance of the membranes was further studied by acolony-counting method, while bacterial adhesion was analyzed by spinning disk confocal microscopeimaging. The TFN membrane prepared with 80 ppm GO-Ag reduced 86% of viable E. coli cells in bacterialsuspensions, with only slight bacterial adherence on the membrane surface.