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( Gajanan R. Patil ),( Vishwanath K. Kokate ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.4
A joint channel estimation and data detection technique for a multiple input multiple output (MIMO) wireless communication system is proposed. It combines the least square (LS) training based channel estimation (TBCE) scheme with sphere decoding. In this new approach, channel estimation is enhanced with the help of blind symbols, which are selected based on their correctness. The correctness is determined via sphere decoding. The performance of the new scheme is studied through simulation in terms of the bit error rate (BER). The results show that the proposed channel estimation has comparable performance and better computational complexity over the existing semi-blind channel estimation (SBCE) method.
Gajanan Ghodake,Surendra Shinde,Avinash Kadam,Rijuta Ganesh Saratale,Ganesh Dattatraya Saratale,Asad Syed,Omar Shair,Marzouq Alsaedi,Dae-Young Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Metal chelation-enhanced changes in surface plasmon resonance (SPR) band of gallic acid-functionalizedAgNP solution to monitor aluminum ions (Al3+) is reported herein. In aqueous solution, Al3+ selectivelyinduced a strong absorbance with large shifts up to125 nm from the SPR band with color changing fromorange to red. This study illustrates that hydroxyl groups of phenol affect the response of a probe thattunes the absorbance maxima to a longer wavelength at 525 nm. Moreover, the rapid formation of aAgNP-Al3+ coordination complex was demonstrated by real-time monitoring, adsorptive removal, andenergy dispersive spectroscopy mapping.
Gajanan Ghodake,Surendra Shinde,Ganesh Dattatraya Saratale,Avinash Kadam,Rijuta Ganesh Saratale,Dae-Young Kim 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Cellulose-based water filters are an affordable alternative to remove particulate matter; however, bacteria are toosmall to be removed simply through size exclusion. Cellulose-based water filters prepared by layer-by-layer (LBL) assemblywith polypropylene-polyethylene (PP/PE) fabric decorated with silver nanoparticles (AgNPs) were tested to remove bacteriafrom water samples. The gallic acid reduction method was used to produce potent antibacterial AgNPs; their decoration ontoPP/PE woven fabrics and the preparation of five-layered paper filters were further investigated. The use of acidic conditionsfor loading AgNPs and improving their spatial distribution onto the PP/PE fabrics, as revealed by scanning electronmicroscopy, was found to be correlated with the fabrics’ antibacterial activity. The PP/PE fabrics decorated with a higherdensity of AgNPs (at pH 2) showed 96.7 % and 97.9 % reductions in the growth of E. coli and S. aureus, respectively. Similarly, paper filters fabricated by LBL assembly of AgNP@PP/PE fabrics with cellulose filters deactivated growing E. coli and S. aureus bacteria with good efficiency: approximately 99.4 % and 98.7 %, respectively. The results indicate thatfabricating water purification filters from the cellulose-based paper is feasible with LBL type assembly. The assembled paperfilters could be commercialized for point-of-use water purification in the future to prevent the spread of water-borne diseases.
Biogenic Nano-Synthesis; towards the Efficient Production of the Biocompatible Gold Nanoparticles
Gajanan Ghodake,엄치용,김시욱,진언선 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
We present a rapid biogenic method for the production of nanoscale gold particles using pear extract. The formation and stability of pear-derived gold nanoparticles (Pear-AuNPs) were monitored by ultraviolet-visible spectroscopy. Their morphology, elemental composition and crystalline phase were determined by transmission electron microscopy, energydispersive X-ray spectroscopy and selected area electron diffraction. The average core size of crystalline Pear-AuNPs was in the range of 10 ± 5 nm and the observed morphology was spherical. The X-ray photoelectron spectrum showed a strong peak for the pure ‘Au’ phase. The circular dichroism spectrum indicated the natural capping ability of the pear extract, which generated peptide-gold nanoparticles. These nanoparticles were stable in aqueous solution for two months. A cell viability assay of Pear-AuNPs showed biocompatibility with human embryonic kidney 293 cells. Accordingly,this eco-friendly process for the bio-mimetic production of Pear-AuNPs is nontoxic in nature; consequently, it will find potential application in nano-biotechnology.