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Search Results: 1 - 10 of 223917 matches for " Guruprasad R "
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Coverage Optimization using Generalized Voronoi Partition
K. R. Guruprasad,Debasish Ghose
Mathematics , 2009,
Abstract: In this paper a generalization of the Voronoi partition is used for optimal deployment of autonomous agents carrying sensors with heterogeneous capabilities, to maximize the sensor coverage. The generalized centroidal Voronoi configuration, in which the agents are located at the centroids of the corresponding generalized Voronoi cells, is shown to be a local optimal configuration. Simulation results are presented to illustrate the presented deployment strategy.
Performance of a Class of Multi-Robot Deploy and Search Strategies based on Centroidal Voronoi Configurations
K. R. Guruprasad,Debasish Ghose
Mathematics , 2009,
Abstract: This paper considers a class of deploy and search strategies for multi-robot systems and evaluates their performance. The application framework used is a system of autonomous mobile robots equipped with required sensors and communication equipment deployed in a search space to gather information. The lack of information about the search space is modeled as an uncertainty density distribution over the search space. A {\em combined deploy and search} (CDS) strategy has been formulated as a modification to {\em sequential deploy and search} (SDS) strategy presented in our previous work. The optimal deployment strategy using Voronoi partition forms the basis for these two search strategies. The strategies are analyzed in presence of constraints on robot speed and limit on sensor range for convergence of trajectories with corresponding control laws responsible for the motion of robots. SDS and CDS strategies are compared with standard greedy and random search strategies on the basis of time taken to achieve reduction in the uncertainty density below a desired level. The simulation experiments reveal several important issues related to the dependence of the relative performances of the strategies on parameters such as number of robots, speed of robots, and their sensor range limits.
Generalized Voronoi Partition Based Multi-Agent Search using Heterogeneous Sensors
K. R. Guruprasad,Debasish Ghose
Mathematics , 2009,
Abstract: In this paper we propose search strategies for heterogeneous multi-agent systems. Multiple agents, equipped with communication gadget, computational capability, and sensors having heterogeneous capabilities, are deployed in the search space to gather information such as presence of targets. Lack of information about the search space is modeled as an uncertainty density distribution. The uncertainty is reduced on collection of information by the search agents. We propose a generalization of Voronoi partition incorporating the heterogeneity in sensor capabilities, and design optimal deployment strategies for multiple agents, maximizing a single step search effectiveness. The optimal deployment forms the basis for two search strategies, namely, {\em heterogeneous sequential deploy and search} and {\em heterogeneous combined deploy and search}. We prove that the proposed strategies can reduce the uncertainty density to arbitrarily low level under ideal conditions. We provide a few formal analysis results related to stability and convergence of the proposed control laws, and to spatial distributedness of the strategies under constraints such as limit on maximum speed of agents, agents moving with constant speed and limit on sensor range. Simulation results are provided to validate the theoretical results presented in the paper.
Effect of weaning at different age intervals on the growth rate of broiler rabbits
Y. B. Rajeshwari,R. Guruprasad,K. Sathyanarayana
Veterinary World , 2010,
Abstract: Fifty broiler rabbit business were divided into five groups based on their age at weaning (3,4,5,6 and 8 weeks of weaning as group I, group II, group III, group IV and group V respectively). The average daily gain in the given group was 17.71, 18.64, 19.00, 20.86 and 21.07 gm/day respectively at the end of 12 week of the study. It was inferred that the difference was non-significant and also no significant difference was observed between the sex. [Vet World 2010; 3(4.000): 171-172]
Identification and Analysis of Novel Amino-Acid Sequence Repeats in Bacillus anthracis str. Ames Proteome Using Computational Tools
G. R. Hemalatha,D. Satyanarayana Rao,L. Guruprasad
Comparative and Functional Genomics , 2007, DOI: 10.1155/2007/47161
Abstract: We have identified four repeats and ten domains that are novel in proteins encoded by the Bacillus anthracis str. Ames proteome using automated in silico methods. A “repeat” corresponds to a region comprising less than 55-amino-acid residues that occur more than once in the protein sequence and sometimes present in tandem. A “domain” corresponds to a conserved region with greater than 55-amino-acid residues and may be present as single or multiple copies in the protein sequence. These correspond to (1) 57-amino-acid-residue PxV domain, (2) 122-amino-acid-residue FxF domain, (3) 111-amino-acid-residue YEFF domain, (4) 109-amino-acid-residue IMxxH domain, (5) 103-amino-acid-residue VxxT domain, (6) 84-amino-acid-residue ExW domain, (7) 104-amino-acid-residue NTGFIG domain, (8) 36-amino-acid-residue NxGK repeat, (9) 95-amino-acid-residue VYV domain, (10) 75-amino-acid-residue KEWE domain, (11) 59-amino-acid-residue AFL domain, (12) 53-amino-acid-residue RIDVK repeat, (13) (a) 41-amino-acid-residue AGQF repeat and (b) 42-amino-acid-residue GSAL repeat. A repeat or domain type is characterized by specific conserved sequence motifs. We discuss the presence of these repeats and domains in proteins from other genomes and their probable secondary structure.
Juvenile Psammomatoid Ossifying Fibroma – A Case Report
Guruprasad R,,Som Datt Gupta,,Nisha Dua,,Ruchi Mehta
People's Journal of Scientific Research , 2011,
Abstract: Juvenile ossifying fibroma (JOF) is a rare fibro-osseous neoplasm in young children. JOF is defined as a variant of the ossifying fibroma, and latter includes juvenile psammomatoid ossifying fibroma (JPOF) and juvenile trabecular ossifying fibroma (JTOF). Both variants involve the craniofacial bones with the trabecular variant being more common in the jaws and the psammomatoid variant being more common in the paranasal sinuses. This lesion is locally aggressive andspreads quickly. As it has a very high recurrence rate, complete excision is essential. A case of large JPOF involving rightmaxilla and other cranial bones in a 12 year old female patient with clinical, radiographic and histopathological features arepresented. Surgical management and follow up is also emphasized.
Non Syndromic Oligodontia
Guruprasad R,Preeti P. Nair,Karthik. Hegde,Manika Singh
Indian Journal of Dental Advancements , 2011,
Abstract: Anodontia is a rare genetic disorder which represents the congenital absence of all teeth in primary, permanent or both dentitions. Anodontia is usually a part of a syndrome and seldom occurs as an isolated entity. It is commonly associated with complex pathology known as Ectodermal dysplasia which originates from the abnormalities during the early stages of embryonic development, and usually transmitted as an X- linked recessive disorder. In this report a case of 9 year old girl is presented who had few set of primary dentition, but surprisingly complete absence of permanent dentition except tooth buds of mandibular canine which were radiographically observed. In this case, anodontia is not associated with any syndrome which is a rare finding.
Japanese Encephalitis Virus Disrupts Cell-Cell Junctions and Affects the Epithelial Permeability Barrier Functions
Tanvi Agrawal, Vats Sharvani, Deepa Nair, Guruprasad R. Medigeshi
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069465
Abstract: Japanese encephalitis virus (JEV) is a neurotropic flavivirus, which causes viral encephalitis leading to death in about 20–30% of severely-infected people. Although JEV is known to be a neurotropic virus its replication in non-neuronal cells in peripheral tissues is likely to play a key role in viral dissemination and pathogenesis. We have investigated the effect of JEV infection on cellular junctions in a number of non-neuronal cells. We show that JEV affects the permeability barrier functions in polarized epithelial cells at later stages of infection. The levels of some of the tight and adherens junction proteins were reduced in epithelial and endothelial cells and also in hepatocytes. Despite the induction of antiviral response, barrier disruption was not mediated by secreted factors from the infected cells. Localization of tight junction protein claudin-1 was severely perturbed in JEV-infected cells and claudin-1 partially colocalized with JEV in intracellular compartments and targeted for lysosomal degradation. Expression of JEV-capsid alone significantly affected the permeability barrier functions in these cells. Our results suggest that JEV infection modulates cellular junctions in non-neuronal cells and compromises the permeability barrier of epithelial and endothelial cells which may play a role in viral dissemination in peripheral tissues.
Prediction of spectral shifts proportional to source distances by time-varying frequency or wavelength selection
V. Guruprasad
Physics , 2008,
Abstract: Any frequency selective device with an ongoing drift will cause observed spectra to be variously and simultaneously scaled in proportion to their source distances. The reason is that detectors after the drifting selection will integrate instantaneous electric or magnetic field values from successive sinusoids, and these sinusoids would differ in both frequency and phase. Phase differences between frequencies are ordinarily irrelevant, and recalibration procedures at most correct for frequency differences. With drifting selection, however, each integrated field value comes from *the sinusoid of the instantaneously selected frequency at its instantaneous received phase*, hence the waveform constructed by the integration will follow the drifting selection with a phase acceleration given by the drift rate times the slope of the received phase spectrum. A phase acceleration is literally a frequency shift, and the phase spectrum slope of a received waveform is an asymptotic measure of the source distance, as the path delay presents phase offsets proportional to frequency times the distance, and eventually exceeding all initial phase differences. Tunable optics may soon be fast enough for realizing such shifts by Fourier switching, and could lead to pocket X-ray devices; sources continuously variable from RF to gamma rays; capacity multiplication with jamming and noise immunity in both fibre and radio channels, passive ranging from ground to deep space; etc.
A wave effect enabling universal frequency scaling, monostatic passive radar, incoherent aperture synthesis, and general immunity to jamming and interference
V. Guruprasad
Physics , 2008, DOI: 10.1117/12.795605
Abstract: A fundamental Doppler-like but asymmetric wave effect that shifts received signals in frequency in proportion to their respective source distances, was recently described as means for a whole new generation of communication technology using angle and distance, potentially replacing TDM, FDM or CDMA, for multiplexing. It is equivalent to wave packet compression by scaling of time at the receiver, converting path-dependent phase into distance-dependent shifts, and can multiply the capacity of physical channels. The effect was hitherto unsuspected in physics, appears to be responsible for both the cosmological acceleration and the Pioneer 10/11 anomaly, and is exhibited in audio data. This paper discusses how it may be exploited for instant, passive ranging of signal sources, for verification, rescue and navigation; incoherent aperture synthesis for smaller, yet more accurate radars; universal immunity to jamming or interference; and precision frequency scaling of radiant energy in general.
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