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Search Results: 1 - 10 of 219310 matches for " P Kumar "
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Elegant and Practical Method of Fir Decimation Using Comb Filters in the Field of Digital Signal Processing  [PDF]
S. Arun Kumar, P. Ganesh Kumar
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.79214
Abstract: This paper deals with the technology of using comb filters for FIR Decimation in Digital Signal Processing. The process of decreasing the sampling frequency of a sampled signal is called decimation. In the usage of decimating filters, only a portion of the out-of-pass band frequencies turns into the pass band, in systems wherein different parts operate at different sample rates. A filter design, tuned to the aliasing frequencies all of which can otherwise steal into the pass band, not only provides multiple stop bands but also exhibits computational efficiency and performance superiority over the single stop band design. These filters are referred to as multiband designs in the family of FIR filters. The other two special versions of FIR filter designs are Halfband and Comb filter designs, both of which are particularly useful for reducing the computational requirements in multirate designs. The proposed method of using Comb FIR decimation procedure is not only efficient but also opens up a new vista of simplicity and elegancy to compute Multiplications per Second (MPS) and Additions per Second (APS) for the desired filter over and above the half band designs.
Defense Mechanism of Renal Functions and Calcium Mixed Mineral Formation in Agar-Agar Gel Medium at Laboratory Environment  [PDF]
J. Kishore Kumar, P. Sundaramoorthi
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.88057
Abstract: Calcium phosphates and oxalates are the most frequently observed bio-mineral phases. Many kinetics studies have been carried out on their crystal formation and dissolution in supersaturated and under saturated solutions, respectively. Major parameters include supernatant solution concentration, ionic strength, pH, temperature and solid surface behaviors. The growth of the calcium phosphate phases such as di-calcium phosphate di-hydrate (DCPD), octa-calcium phosphate (OCP), hydroxyapatite (HAP), and fluorapatite (FAP) crystals are observed. The ability of a surface to nucleate mineral phases is closely related to the magnitude of the interfacial energies. CaSeHPO4 crystals are grown in laboratory growth environments by the author in agar gel medium. Many characterization studies are done using grown crystals, such as FTIR, TGA/DTA, etching, SEM and XRD of the grown crystals are carried out and the results are reported.
Performance Analysis of Malicious Node Detection and Elimination Using Clustering Approach on MANET  [PDF]
S. Gopalakrishnan, P. Mohan Kumar
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.76064
Abstract: Mobile Ad hoc Network (MANET) is a significant concept of wireless networks which comprises of thousands of nodes that are mobile as well as autonomous and they do not requires any existing network infrastructure. The autonomous nodes can freely and randomly move within the network which can create temporary dynamic network and these networks can change their topology frequently. The security is the primary issue in MANET which degrades the network performance significantly. In this paper, cluster based malicious node detection methodology is proposed to detect and remove the malicious nodes. Each node within the cluster gets the cluster key from the cluster head and this key is used for the data transaction between cluster head and node. The cluster head checks this key for every data transaction from node and match with their cluster table. If match is valid, and then only it will recognize that this node is belongs to this cluster, otherwise it is decided as malicious node. This paper also discusses the detection of link failure due to the presence of malicious node by determining the gain of each link in the network. The performance of the proposed method is analyzed using packet delivery ratio, network life time, and throughput and energy consumption. The proposed malicious node detection system is compared with the conventional techniques as OEERP (Optimized energy efficient routing protocol), LEACH (Low energy adaptive clustering hierarchy), DRINA (Data routing for In-network aggregation) and BCDCP (Base station controlled dynamic clustering protocol).
Damping Factor Estimation of a Flexible-Matrix-Composite Body Pump  [PDF]
N. P. Kumar, H. Ghoneim
Journal of Materials Science and Chemical Engineering (MSCE) , 2016, DOI: 10.4236/msce.2016.47009
Abstract:

Two very important factors which determine the effectiveness of a pump are its volumetric and power efficiencies. Yin and Ghoneim constructed a prototype of a Flexible-Matrix-Composite (FMC) body pump with a very high volumetric efficiency or pumping potential (the relative volume reduction due to a relative input stroke). The high volumetric efficiency is attributed to the geometry of the pump’s structure (hyperboloid) as well as the high negative effective Poisson’s ratio of the 3-layer [θ/β/θ] flexible-matrix-composite (carbon/polyurethane) laminate adopted for the body of the pump. However, the power efficiency of the pump was not evaluated. It is the objective of the current paper to obtain an estimate of the power efficiency of the pump. The viscoelastic properties of the 3-layer FMC (carbon/polyurethane) laminate are evaluated experimentally using the Dynamic Mechanical Analyzer (DMA) as well as analytically by applying the correspondence principle together with the micro-mechanics approach. In order to obtain an estimate of the power efficiency of the FMC body pump, the axial and shear loss factors of a laminated infinitely long cylindrical tube as functions of β and θ fiber orientation angles are determined employing the Adam and Bacon approach. The analysis engenders high loss factors (greater than 0.4), which suggests that the power efficiency of the proposed pump using the 3-layer carbon/polyurethane laminate may be low.

Locational marginal prices with SVC in Indian electricity market
A Kumar, P Kumar
International Journal of Engineering, Science and Technology , 2011,
Abstract: Spot pricing based on short run marginal cost (SRMC) theory has the potential to provide the economic signals for the power system operation. Reactive power has gained importance as an ancillary service in competitive markets and its impact on nodal price can not be ignored. With the emergence of FACTS technology, their role in the marginal price determination should be considered taking their cost function into account. In this paper, the nodal price for real and reactive power considering different reactive power price cost calculation methods for generator reactive power has been presented. The impact of Static Var Compensator has also been considered taking their cost function into account. Mixed integer non-linear programming approach has been formulated for the solution. The proposed approach has been applied for Indian 246-bus NREG system taking bilateral transactions into consideration over and above the pool transactions.
Effects of root extract of withania somnifera in 3- nitropropionic acid-induced cognitive dysfunction and oxidative damage in rats
P Kumar, A Kumar
International Journal of Health Research , 2008,
Abstract: Purpose: To investigate the possible modulatory role of root extract of Withania somnifera (WS) in 3-Nitroproiponic acid (3-NP)-induced cognitive impairment and altered level of oxidative defense in discrete areas of rat brain. Methods: 3-NP was administered in a dose of 10 mg/kg for 14 days where as WS root extract (100 and 200 mg/kg) was administered orally along with 3-NP. Cognitive dysfunctions were assessed in Morris water maze and plus-maze performance task paradigms. On 15th day the animals were scarified and reduced glutathione, total glutathione, oxidized glutathione (GSSG), glutathione-S-transferase (GST) and acetylcholinesterase enzyme levels were estimated in the striatum, cortex and hippocampus of the rat brian. Results: Chronic WS root extract (100, 200 mg/kg) treatment for a period of 14 days significantly improved 3-NP-induced cognitive impairment in Morris water and plus maze tests (p<0.05). Further, WS root extract treatment significantly restored GSH, total glutathione, oxidized glutathione, GST and attenuated acetylcholinesterase levels in striatum, cortex and hippocampus regions of brain. Conclusion: There is possible neuroprotective effect of WS root extract against a 3-NP- induced neurotoxicity in rats.
Skin Branding
Kumar Sudhir,Kumar P
Journal of Postgraduate Medicine , 2004,
Abstract:
Nasal screening of healthcare workers for nasal carriage of coagulase positive MRSA and prevalence of nasal colonization with Staphylococcus aureus
P. Kumar
Biology and Medicine , 2011,
Abstract: The aim of the study was to screening for coagulase positive methicillin resistant Staphylococcus aureus (MRSA) inhealthcare workers and prevalence of nasal colonization with Staphylococcus aureus. We included 84 healthcareworkers’ samples (nasal swabs) in the study. Different biochemical tests were done to isolate Staphylococcus aureus.Species confirmation for Staphylococcus aureus was done using the tube coagulase test and DNase test. Antibioticsusceptibility pattern for MRSA was done by Kirby – Bauer disk diffusion method. Coagulase positive Staphylococcusaureus were subjected to oxacillin agar screen method to screen for MRSA. Out of 84 healthcare workers’ samples66(78.6%) were positive for S.aureus and 18(21.4%) showed no isolation of S.aureus. Out of 66 S.aureus isolates,40(60.6%) was Coagulase positive Staphylococcus aureus (CoPS) and 26(39.3%) were Coagulase negativeStaphylococcus aureus (CoNS). Out of total 40 isolates of Coagulase positive Staphylococcus aureus (CoPS),18(45%) were found to be resistant to methicillin and 22(55%) CoPS isolates were methicillin susceptibleStaphylococcus aureus (MSSA). The nasal carriage of CoPS in healthcare workers was seen to be 33(82.5%)doctors and 7(17.5%) lab technicians. The nasal carriage of coagulase positive MRSA in healthcare workers wereobserved to be 15(83.3%) doctors and 3(16.6%) lab technicians. The study showed that out of total specimenscollected from healthcare workers, doctors and lab technicians were carrier for MRSA. The highest percentage ofnasal carriage of coagulase positive MRSA among healthcare workers was observed to be among the doctors andless percentage in lab technicians. Screening should be made an essential protocol to assess the carrier transmitteddrug resistant strains of Staphylococci from the community to the hospital settings and hospital settings tocommunity.
Census-2001 Report And Its Interpretation
Kumar P
Indian Journal of Community Medicine , 2004,
Abstract:
Social Classification - Need For Constant Updating
Kumar P
Indian Journal of Community Medicine , 1993,
Abstract: Socio-economic status influences the health of individuals and also the utilization of available health facilities. Of several available parameters, such as income, occupation, education, religion, caste, place of residence etc., the per capita monthly income has been the basis of the Prasada€ s social classifications which is most commonly used in Indian studies. With inflationary trends of the economy this classification needs constant revision. An attempt has been made to link it with the all India consumer price index (AICPI) and a modified classification has been proposed with a built a€" in provision of its upgrading from time to keep it relevant and useful.
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