RNS Institute of Technology

Bangalore, India

RNS Institute of Technology

Bangalore, India
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Prakash Tunga P.,RNS Institute of Technology | Singh V.,RNS Institute of Technology
2016 IEEE International Conference on Recent Trends in Electronics, Information and Communication Technology, RTEICT 2016 - Proceedings | Year: 2016

Image segmentation refers to partitioning of image into multiple regions (segments) eventually leading to meaningful representation of image through which information can be extracted. Magnetic Resonance Imaging (MRI) is a non-invasive method which provides the detailed view of internal structure of tissues in the body at very high resolution. This paper focuses on extraction of brain tumor and its region description through segmentation from the brain MRI image. At first, pre-processing step for noise removal is carried out. Brain tumor extraction is done by considering the methods based on k-means clustering, morphological operations and region growing. A comparative analysis of the three methods is done for various brain MR images. Here we refer the tumor in the brain MRI as region of interest (ROI) and rest of the image is referred as Non-region of interest (NROI). © 2016 IEEE.


Ashwini K.,RNS Institute of Technology | Yashaswini,BMS College of Engineering | Pandurangappa C.,RNS Institute of Technology
Optical Materials | Year: 2014

Europium doped zinc sulfide nanocrystals (ZnS:Eu) are prepared by solvothermal method. Crystallite size and lattice constant of the prepared samples are calculated from the X-ray diffraction patterns. The as-prepared samples are found to be a mixture of complex chemical groups. Heat treatment of the samples at 300 °C resulted in ZnS:Eu state. The crystal structure is not affected by the increase in the concentration of Eu from 1 mol% to 5 mol%. Fourier Transform Infrared Spectroscopy (FTIR) studies showed that characteristic absorption bands of hydroxyl groups and the acetate bands increased with increase in Eu concentration. The morphological results studied using Scanning Electron Microscopy (SEM) indicate agglomeration of nanoparticles and a marginal increase in the particle size. Photoluminescence (PL) spectra of the samples showed a prominent emission band peaked at ∼400 nm besides three weak ones at ∼422, 485 and 530 nm. The PL intensity increased with increase in Eu concentration. © 2014 Elsevier B.V. All rights reserved.


Vajravelu K.,University of Central Florida | Prasad K.V.,Bangalore University | Prasanna Rao N.S.,RNS Institute of Technology
Computers and Mathematics with Applications | Year: 2011

A numerical solution for the steady magnetohydrodynamic (MHD) non-Newtonian power-law fluid flow over a continuously moving surface with species concentration and chemical reaction has been obtained. The viscous flow is driven solely by the linearly stretching sheet, and the reactive species emitted from this sheet undergoes an isothermal and homogeneous one-stage reaction as it diffuses into the surrounding fluid. Using a similarity transformation, the governing non-linear partial differential equations are transformed into coupled nonlinear ordinary differential equations. The governing equations of the mathematical model show that the flow and mass transfer characteristics depend on six parameters, namely, the power-law index, the magnetic parameter, the local Grashof number with respect to species diffusion, the modified Schmidt number, the reaction rate parameter, and the wall concentration parameter. Numerical solutions for these coupled equations are obtained by the KellerBox method, and the solutions obtained are presented through graphs and tables. The numerical results obtained reveal that the magnetic field significantly increases the magnitude of the skin friction, but slightly reduces the mass transfer rate. However, the surface mass transfer strongly depends on the modified Schmidt number and the reaction rate parameter; it increases with increasing values of these parameters. The results obtained reveal many interesting behaviors that warrant further study of the equations related to non-Newtonian fluid phenomena, especially shear-thinning phenomena. Shear thinning reduces the wall shear stress. © 2011 Elsevier Ltd. All rights reserved.


Kavitha K.,Siddaganga Institute of Technology | Sudhamani M.V.,RNS Institute of Technology
Proceedings - 2014 5th International Conference on Signal and Image Processing, ICSIP 2014 | Year: 2014

Content based image retrieval (CBIR) is a promising way to address image retrieval based on the visual features of an image like color, texture and shape. Every visual feature will address a specific property of the image, so the state of the art focuses on combination of multiple visual features for content based image retrieval. In this paper we have devised a content based image retrieval system based on the combination of local and global features. The local features used are Bidirectional Empirical Mode Decomposition (BEMD) technique for edge detection and Harris corner detector to detect the corner points of an image. The global feature used is HSV colorfeature. For the experimental purpose the COIL-100 database has been used. The result show significant improvement in the retrieval accuracy when compared to the existing systems. © 2014 IEEE.


Swathi S.K.,Indian Institute of Science | Jeevananda T.,RNS Institute of Technology | Ramamurthy P.C.,Indian Institute of Science
Organic Electronics: physics, materials, applications | Year: 2010

Polypyrrole (PPy) - multiwalled carbonnanotubes (MWCNT) nanocomposites with various MWCNT loading were prepared by in situ inversion emulsion polymerization technique. High loading of the nano filler were evaluated because of available inherent high interface area for charge separation in the nanocomposites. Solution processing of these conducting polymer nanocomposites is difficult because, most of them are insoluble in organic solvents. Device quality films of these composites were prepared by using pulsed laser deposition techniques (PLD). Comparative study of X-ray photoelectron spectroscopy (XPS) of bulk and film show that there is no chemical modification of polymer on ablation with laser. TEM images indicate PPy layer on MWCNT surface. SEM micrographs indicate that the MWCNT's are distributed throughout the film. It was observed that MWCNT in the composite held together by polymer matrix. Further more MWCNT diameter does not change from bulk to film indicating that the polymer layer remains intact during ablation. Even for very high loadings (80 wt.% of MWCNT's) of nanocomposites device quality films were fabricated, indicating laser ablation is a suitable technique for fabrication of device quality films. Conductivity of both bulk and films were measured using collinear four point probe setup. It was found that overall conductivity increases with increase in MWCNT loading. Comparative study of thickness with conductivity indicates that maximum conductivity was observed around 0.2 μm. © 2010 Elsevier B.V. All rights reserved.


Sumathi S.,RNS Institute of Technology
International Journal of Electrical Power and Energy Systems | Year: 2015

Control of voltage in a power system under varying load conditions can be achieved by varying the generator excitation, changing the tap position of transformers and by varying the reactive power injection or absorption at the shunt compensated buses. Proper coordination of these controllers is essential for the effective operation of the power system. This paper deals with the development of Artificial Neural Network which gives the voltage controller settings, such that the voltage deviations at the load buses are minimum. © 2014 Elsevier Ltd. All rights reserved.


Pandurangappa C.,RNS Institute of Technology | Lakshminarasappa B.N.,Bangalore University
Philosophical Magazine | Year: 2011

Samarium-doped calcium fluoride (CaF2) nanoparticles were synthesized by the co-precipitation method and characterized by powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), optical absorption and photoluminescence (PL) techniques. The PXRD patterns confirmed the cubic crystallinity of the synthesized nanoparticles. The average particle size estimated using Scherer's formula was ∼20 nm. The purity of the synthesized nanoparticles was confirmed by the FTIR spectrum. The morphological features studied using SEM revealed that the nanoparticles were agglomerated and porous. The optical absorption spectrum showed a strong and prominent absorption peak at ∼264nm and a weak one at ∼212 nm. The PL spectrum showed broad and prominent emissions with peaks at ∼387 and 532nm along with weak emissions at 573 and 605 nm. © 2011 Taylor & Francis.


Raju G.T.,RNS Institute of Technology | Sudhamani M.V.,RNS Institute of Technology
Advances in Intelligent Systems and Computing | Year: 2013

Web users are experiencing a long latency while retrieving the Web pages due to the amount of network traffic increased with the WWW expansion. Potential sources of latency are the Web servers' heavy load, network congestion, low bandwidth, bandwidth underutilization, and propagation delay. To solve the latency problem, prefetching technique that predicts the destination pages for user community has become critical to save the communication overhead. Prefetching means fetching of Web pages before the users request them so as to reduce the user perceived latency. A novel Cluster and Prefetch (CPF) approach is proposed in this paper. Experimental results shows that the CPF approach effectively reduces the user perceived latency without wasting the network resources with high prediction accuracy. © 2013 Springer.


Pandurangappa C.,RNS Institute of Technology | Lakshminarasappa B.,Bangalore University
Journal of Nanomedicine and Nanotechnology | Year: 2011

Calcium fluoride (CaF2) nanoparticles were synthesized by co-precipitation method and characterized by powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM). Also, optical absorption (OA) and photoluminescence (PL) studies on gamma irradiated (γ-rayed) CaF2 nanoparticles were carried out. The XRD patterns confirmed the cubic crystallinity of the samples and the particle size was found to be ~25 nm. The purity of the synthesized nanoparticles was confirmed by FTIR spectrum. The morphological features studied using SEM revealed the agglomerated and porous nature of nanoparticles. γ-rayed CaF2 nanoparticles showed a prominent absorption with a peak at ~360 nm besides three weak but well separated absorptions at ~ 267, 442 and 510 nm. The various defect centers responsible for the absorption peaks were identified. The PL studies of samples showed strong emissions at ~396 nm and 425 nm. The observed PL emissions are attributed to defects created in nanocrystalline CaF2. © 2011 Pandurangappa C, et al.


Pandurangappa C.,RNS Institute of Technology | Lakshminarasappa B.N.,Bangalore University | Nagabhushana B.M.,M.S. Ramaiah Institute of Technology
Journal of Alloys and Compounds | Year: 2010

Calcium fluoride nanocrystals (CaF2) were synthesized by two different techniques namely co-precipitation and hydrothermal. The synthesized nanocrystals were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared red spectroscopy (FTIR), scanning electron microscopy (SEM), optical absorption and photoluminescence (PL). The crystallite size estimated using Scherer's formula was found to be in the range 30-35 nm for nanocrystals synthesized by co-precipitation method where as in case of hydrothermally synthesized nanocrystals it is in the range 20-28 nm which is less compared to those obtained by co-precipitation method. The morphological features as studied using SEM revealed that the nanocrystals are agglomerated, crispy with porous. The SEM images of hydrothermally synthesized nanocrystals showed less agglomeration than those obtained by co-precipitation method and the images confirm the formation of nanoparticles. The optical absorption spectrum showed a strong absorption band peaked at 244 nm for nanocrystals synthesized by co-precipitation method and it is 218 nm peak in case of hydrothermally synthesized ones. The PL emission spectrum showed two prominent emission bands peaked at 330 and 600 nm when excited at 218 nm. © 2009 Elsevier B.V. All rights reserved.

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