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Interference Avoidance through Pilot-Based Spectrum Sensing Algorithm in Overlaid Femtocell Networks
Padmapriya Sambanthan,Tamilarasi Muthu 한국전자통신연구원 2016 ETRI Journal Vol.38 No.1
Co-channel interference between macro–femtocell networks is an unresolved problem, due to the frequency reuse phenomenon. To mitigate such interference, a secondary femtocell must acquire channel-state knowledge about a co-channel macrocell user and accordingly condition the maximum transmit power of femtocell user. This paper proposes a pilot-based spectrum sensing (PSS) algorithm for overlaid femtocell networks to sense the presence of a macrocell user over a channel of interest. The PSS algorithm senses the pilot tones in the received signal through the power level and the correlation metric comparisons between the received signal and the local reference pilots. On ensuring the existence of a co-channel macrocell user, the maximum transmit power of the corresponding femtocell user is optimized so as to avoid interference. Time and frequency offsets are carefully handled in our proposal. Simulation results show that the PSS algorithm outperforms existing sensing techniques, even at poor received signal quality. It requires less sensing time and provides better detection probability over existing techniques.
Bounds for the First Zagreb Eccentricity Index and First Zagreb Degree Eccentricity Index
Padmapriya, P.,Veena, Mathad Department of Mathematics 2018 Kyungpook mathematical journal Vol.58 No.2
The first Zagreb eccentricity index $E_1(G)$ of a graph G is defined as the sum of squares of the eccentricities of the vertices. In this paper some bounds for the first Zagreb eccentricity index and first Zagreb degree eccentricity index are computed.
Hydrolysates with emulsifying properties prepared from protein wastes using microbial protease
D. Padmapriya,C. Shanthi 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.8
lant-based protein hydrolysates have found applications in food industry for emulsification, foaming, and increasing shelf life of food products. The objective of this study is to isolate protease-secreting bacteria hydrolyzing protein waste, and subjecting the resultant hydrolysates for the characterization for application in the food industry. Peanut cake hydrolysates were prepared using proteases from two microorganisms selected for the purpose, viz., Aneurinibacillus migulanus, VITPM11 and Aneurinibacillus aneurinilyticus, VITPS07. The cleavage specificity of the proteases from VITPM11 and VITPS07 were found to be like plasmin and elastase respectively. The cleaving sites of proteases for peanut proteins were predicted using expasy tool. The protease of VITPM11 had maximal activity of 325.8 ± 0.1 U/mL in peanut-cake media. The degree of hydrolysis (32.03 ± 0.89%), solubility (88.5 ± 1.18%), emulsion stability index (89.76 ± 2.80) and foaming stability (68.67 ± 1.53%) properties of VITPM11 protease correlated well with results from bioinformatic studies.
Numerical Solutions of Fuzzy Fractional Delay Differential Equations
V. Padmapriya,M. Kaliyappan,A. Manivannan 한국지능시스템학회 2020 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.20 No.3
In this paper, a novel technique is proposed to solve fuzzy fractional delay differential equations (FFDDEs) with initial condition and source function, which are fuzzy triangular functions. The obtained solution is a fuzzy set of real functions. Each real function satisfies an FFDDE with a specific membership degree. A detailed algorithm is provided to solve the FFDDE. The proposed method has been elucidated in detail through numerical illustrations. Graphs are plotted using MATLAB.
V. Padmapriya,M. Kaliyappan 한국지능시스템학회 2022 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.22 No.2
The matrix Mittag-Leffler functions play a crucial role in several applications related to systems with fractional dynamics. These functions represent a generalization for fractional-ordersystems of the matrix exponential function involved in integer-order systems. Computationaltechniques for evaluating the matrix Mittag-Leffler functions are therefore of particular importance. In this study, a fuzzy system of differential equations with fractional derivatives wassolved in terms of the matrix Mittag-Leffler functions. The matrix Mittag-Leffler function wasevaluated based on the Jordan canonical form and the minimal polynomial of the matrix
Some topological indices of certain classes of cycloalkenes
Veena Mathad,Padmapriya P,Ismail Naci CANGUL 장전수학회 2019 Proceedings of the Jangjeon mathematical society Vol.22 No.2
Let G = (V;E) be a simple connected molecular graph. The degree di of any vertex vi in G is the number of edges incident with vi and the eccentricity ei of vi is the largest distance between vi and any other vertex of G. In this paper, we establish general formulae for some degree based and eccentricity based topological indices of cycloalkenes.
Yang, Liju,Banada, Padmapriya P.,Chatni, Mohammad R.,Seop Lim, Kwan,Bhunia, Arun K.,Ladisch, Michael,Bashir, Rashid Royal Society of Chemistry 2006 Lab on a chip Vol.6 No.7
<P>In this study, we demonstrated a micro-fluidic system with multiple functions, including concentration of bacteria using dielectrophoresis (DEP) and selective capture using antibody recognition, resulting in a high capture efficiency of bacterial cells. The device consisted of an array of oxide covered interdigitated electrodes on a flat silicon substrate and a ∼16 µm high and ∼260 µm wide micro-channel within a PDMS cover. For selective capture of <I>Listeria monocytogenes</I> from the samples, the channel surface was functionalized with a biotinylated BSA–streptavidin–biotinylated monoclonal antibody sandwich structure. Positive DEP (at 20 V<SUB>pp</SUB> and 1 MHz) was used to concentrate bacterial cells from the fluid flow. DEP could collect ∼90% of the cells in a continuous flow at a flow rate of 0.2 µl min<SUP>−1</SUP> into the micro-channel with concentration factors between 10<SUP>2</SUP>–10<SUP>3</SUP>, in sample volumes of 5–20 µl. A high flow rate of 0.6 µl min<SUP>−1</SUP> reduced the DEP capture efficiency to ∼65%. Positive DEP attracts cells to the edges of the electrodes where the field gradient is the highest. Cells concentrated by DEP were captured by the antibodies immobilized on the channel surface with efficiencies of 18 to 27% with bacterial cell numbers ranging from 10<SUP>1</SUP> to 10<SUP>3</SUP> cells. It was found that DEP operation in our experiments did not cause any irreversible damage to bacterial cells in terms of cell viability. In addition, increased antigen expression (antigens to C11E9 monoclonal antibody) on cell membranes was observed following the exposure to DEP.</P> <P>Graphic Abstract</P><P>Bacterial cells were concentrated by positive dielectrophoresis. Target cells were selectively captured by specific antibodies immobilized on the channel surface. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b607061m'> </P>
Murugesan Manikkampatti Palanisamy,Akilamudhan Palaniyappan,Venkata Ratnam Myneni,Kannan Kandasamy,Padmapriya Veerappan 한양대학교 세라믹연구소 2022 Journal of Ceramic Processing Research Vol.23 No.1
The electronics industry is the world's largest and fastest growing industry. This consumer-centric industry's combination oftechnology advancements and quick product obsolescence creates new environmental issues. There is an urgent need toaddress the volume and toxicity of electronic waste generated. Printed circuit boards (PCBs) are a significant component ofelectronic trash, containing mostly heavy metals such as copper (Cu), tin (Sn), zinc (Zn), and lead (Pb). Metal recovery andrecycling from PCBs is an important step in pollution prevention. Researchers have devised many methods for recoveringprecious metals from PCBs, including gravity separation, magnetic separation, and electrostatic separation, as well as PCBseparation using the organic solvent technique, leaching method, bioleaching method, or a combination of these methods. Thisresearch provides a brief summary of India's present e-waste status, environmental and health risks, continuing waste disposaland recycling activities, and emphasizes the recovery of heavy metals from PCBs by systematic leaching/bioleaching.