Browsing by Author "Kulkarni, S."

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A novel technique for sketch to photo synthesis
(2010) Purkait, P.; Chanda, B.; Kulkarni, S.
We propose a novel pseudo photo generation system from a sketch image. All the training images and the input test sketch are warped around its mean shape to get shape free images. Based on local geometry preserving manifold learning method called locally linear embedding (LLE), a shape free pseudo-photo is synthesized by block matching. Then the photo of actual shape is constructed with the help of an Active Shape Model(ASM) and a neural network built on shape control point coordinate pair for training sketch-photo samples. We experimented over 300 sketch-photo image pairs and output synthesized photo for every test image is encouraging. Â© 2010 ACM.
Alkali absorption and durability studies on CFRP laminated composites
(American Institute of Physics Inc. subs@aip.org, 2020) Mohan Kumar, T.S.M.; Krishna, M.; Joladarashi, S.; Kulkarni, S.
Fiber Reinforced Plastics (FRP) are widely used in marine, aeronautical, automotive, space applications due to their corrosive resistance and low cost to performance. The main aim of this research was to examine the impact of alkali absorption and durability in the Carbon/Epoxy, Carbon/Vinylester, and Carbon/Isopolyester composites immersed in 13.59 pH alkaline solutions for a maximum of 25 days at 27Â°C (room temperature) and 65Â°C. Epoxy, vinyl-ester and Isoployester resin are selected as a matrix material and Poly-acrylonitrile-based Carbon fiber of 200 gsm fabrics is chosen as reinforcement and hand lay-up process is used for fabrication in the ratio of 35: 65 respectively and cured at room temperature with applied pressure using hydraulic press for 24 hrs. Solution of alkali was prepared and specimens were subjected to alkali solution. The moisture absorption was calculated on the basis of rate of moisture for every 5days interval and rate of diffusion coefficient (m2/sec) were calculated. Similarly durability studies (UTS, ILSS and FS) are conducted at 27Â°C and 65Â°C. Characterization of the fractured area was done using a scanning microscope. The obtained result rate of moisture absorption in case of neat casting and CFRP specimen shows the maximum alkali absorption in Iso-polyester / carbon whereas the minimum absorption was shown in vinyl ester/carbon specimens at RT and at 65Â°C over a period of 25days. At room temperature and 65Â°C the diffusion coefficient (D) was found and identified higher value for Iso-polyester/carbon and low for vinyl ester/carbon this is because Iso-polyester are distributed along the main chain, which makes easily available for reaction but in vinylesters the ester functional groups acts as a shield by methyl groups which restrict the easy absorption. Reduce in percentage in mechanical properties is due to Alkali absorption in terms of reduced degradation values in UTS, Flexural Strength and ILSS samples, carbon / epoxy showed supremacy over vinylester / carbon and iso-polyester / carbon. Scanning electron microscopy images show the embrittlement and micro-cracks on surface due to exposure to the alkali environments, matrix bonded to fiber are hardly identified as the temperature increases. Â© 2020 Author(s).
Analysis and experimental testing of a built-up composite cross arm in a transmission line tower for mechanical performance
(2013) Selvaraj, M.; Kulkarni, S.; Babu, R.R.
This paper discusses the development of a composite cross arm for a power transmission line tower using FRP pultruded profiles. The mechanical performance of the composite cross arm has been evaluated using experimental testing and an analytical solution as well as a finite element simulation. By using the composite cross arm in place of a steel cross arm with ceramic insulators, considerable reduction of transmission corridor is achieved. 2012 Elsevier Ltd.
Analysis and experimental testing of a built-up composite cross arm in a transmission line tower for mechanical performance
(2013) Selvaraj, M.; Kulkarni, S.; Ramesh Babu, R.
This paper discusses the development of a composite cross arm for a power transmission line tower using FRP pultruded profiles. The mechanical performance of the composite cross arm has been evaluated using experimental testing and an analytical solution as well as a finite element simulation. By using the composite cross arm in place of a steel cross arm with ceramic insulators, considerable reduction of transmission corridor is achieved. © 2012 Elsevier Ltd.
Compressive properties of sandwiches with functionally graded rubber core and jute-epoxy skins
(2013) Doddamani, M.R.; Kulkarni, S.
The compressive behaviour of a new class of sandwich composite made up of jute fiber reinforced epoxy skins and piece-wise linear fly ash reinforced functionally graded (FG) rubber core is investigated in flat-wise mode. FG samples are prepared using conventional casting techniéue. Presence of gradation is éuantified physically by weight method. This paper addresses the effect of weight fraction of fly ash, core to thickness ratio (C/H) and orientation of jute on specific compressive modulus and strength. In each trial five replicates are tested with lower amount of fly ash below the upper skin of sandwich (rubber-up). Results of experimentation are subjected to statistical analysis of variance (ANOVA) to find the influential factor governing the compressive behaviour. Furthermore piece-wise linear gradation is modeled in finite element and strength values are compared with experimental results. Sandwich sample with fly ash content of 40%, C/H of 0.4 and orientations of 30?/60? registered better performance. Specific strength is observed to increase upto 30% filler content followed by stabilization. Finite element results for strength match very well with experimental ones.
Hierarchical clustering approaches for flood assessment using multi-sensor satellite images
(2019) Senthilnath, J.; Shreyas, P.B.; Rajendra, R.; Suresh, S.; Kulkarni, S.; Benediktsson, J.A.
In this paper, hierarchical clustering methods are used on synthetic aperture radar (SAR) (during the flood) and LISS-III (before the flood) data to analyse damage caused by floods. The flooded and non-flooded regions are extracted from the SAR image while different land cover regions are extracted from the LISS-III image. Initially, the Bayesian information criterion (BIC) is implemented to obtain the constraints for the number of clusters. The optimal cluster centres are then computed using hierarchical clustering approach (i.e. cluster splitting and merging techniques). The cluster splitting techniques such as Iterative Self-Organising Data Technique (ISODATA), Mean Shift Clustering (MSC), Niche Genetic Algorithm (NGA) and Niche Particle Swarm Optimisation (NPSO) were applied on SAR and LISS-III data. The cluster centres obtained from these algorithms are used to group similar data points by using merging method into their respective classes. Further, the results obtained for each method are overlaid to analyse the individual land cover region that is affected by floods. 2018, 2018 Informa UK Limited, trading as Taylor & Francis Group.
Hierarchical clustering approaches for flood assessment using multi-sensor satellite images
(Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2019) Senthilnath, J.; Shreyas, P.B.; Rajendra, R.; Sundaram, S.; Kulkarni, S.; Benediktsson, J.A.
In this paper, hierarchical clustering methods are used on synthetic aperture radar (SAR) (during the flood) and LISS-III (before the flood) data to analyse damage caused by floods. The flooded and non-flooded regions are extracted from the SAR image while different land cover regions are extracted from the LISS-III image. Initially, the Bayesian information criterion (BIC) is implemented to obtain the constraints for the number of clusters. The optimal cluster centres are then computed using hierarchical clustering approach (i.e. cluster splitting and merging techniques). The cluster splitting techniques such as Iterative Self-Organising Data Technique (ISODATA), Mean Shift Clustering (MSC), Niche Genetic Algorithm (NGA) and Niche Particle Swarm Optimisation (NPSO) were applied on SAR and LISS-III data. The cluster centres obtained from these algorithms are used to group similar data points by using merging method into their respective classes. Further, the results obtained for each method are overlaid to analyse the individual land cover region that is affected by floods. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.
Investigation on effect of processing parameters on properties of recycled-pet composites using taguchi method
(2013) Prabhu, K.B.; Chomal, G.J.; Kulkarni, S.
Although plastics have remarkable impact on our culture, extensive consumption has led to post consumption disposal problems and adverse effect on environment. The dangerous impact on environment at every stage of their production, service and disposal has promoted recycling plastics for building better and healthier world. Moreover, recycled plastic is a cheaper source of material and help industries to cut down material cost. Poly (ethylene terephthalate) (PET) is one of the plastic that is disposed in abundance owing to heavy masses produced in beverage industries. One of the popular ways of recycling is thermo-mechanical technique owing to simplicity in the process, lower costs and damages to the environment. In the present work, recycled-PET (r-PET) is thermo-mechanically recycled by compression moulding and studied for their flexural strength and wear resistance, for its possible use as plastic gears in low-tech applications like toys. The r-PET is reinforced with fly ash cenospheres (FAC) that are low cost fillers having good mechanical properties. Taguchi methodology is adopted for experimental design and analysis of the results. The results points to the fact that proportion of FAC, moulding pressure and mould temperature are the major contributors for the strength and wear properties of r-PET/FAC composite. Further, Response Surface Methodology (RSM) is adapted to optimize the parameters for both strength and the wear rate. The contour plots show that around 5.4-7% of FAC content with 11.6 - 14.4 MPa of pressure is the optimum parameter for both flexural strength and specific wear rate. The analysis is purely on macro mechanical front with an aim to obtain totally recycled low cost material. Copyright 2013 by Aurora Flight Sciences.
Modeling and analysis of a SWCNT piezoresistive pressure sensor
(2013) Bangera, A.E.; Kulkarni, S.
The paper considers modeling and analysis of a circular diaphragm Single Walled Carbon Nanotube (SWCNT) piezoresistive pressure sensor using COMSOL Multiphysics. Initially, the analysis of piezoresistivity in SWCNT by the application of strain is done both by analytical and numerical approach using MATLAB and COMSOL respectively. It is observed that both results are comparable. Thus, the analysis of the structural deformation of the piezoresistive SWCNT placed above the diaphragm which results in the change of resistance in SWCNT, which is in direct accordance with the applied pressure is performed in COMSOL Multiphysis. The simulations show that the results obtained are linear and the sensitivity of the sensor is adequate. Â© 2013 IEEE.
Modelling and Analysis of Material Behaviour under Normal and Oblique Low Velocity Impact
(2018) Vishwas, M.; Joladarashi, S.; Kulkarni, S.
The present article deals with analysis of various engineering materials (rubber, steel, aluminum and glass epoxy) under low velocity gravity impact loading normal to the plate as well as at an oblique angle of 20 degrees. Impact damage remains a major concern for structural components; the impact of objects can create internal damage that can significantly reduce their structural strength, because of its complex nature. The investigation of low velocity impact remains an area of interest and has received much attention. Very few research work have been done on the oblique impact behaviour of composites, where most of them concentrates on high-velocity impact conditions. The study on low-velocity oblique impact of composites are scare. Comparison of the above said materials is reported considering various parameters such as total energy, contact force, deformation, von Mises stress and strain and specific energy absorbed. Specific energy absorbed by each material considered are compared both under normal impact and oblique impact and the results confirmed that rubber absorbs 11.72 times more energy than structural steel, 3.24 times more energy than aluminium and 1.8 times more energy than glass epoxy, when subjected to normal impact. In case of oblique impact at 20 degrees rubber absorbs 47.6 times more energy than structural steel, 14 times more energy than aluminium and 8.6 times more energy than glass epoxy. This makes rubber as an ideal polymer for dynamic structural applications subjected to low velocity impact under oblique condition. � 2017 Elsevier Ltd.
A novel technique for sketch to photo synthesis
(2010) Purkait, P.; Chanda, B.; Kulkarni, S.
We propose a novel pseudo photo generation system from a sketch image. All the training images and the input test sketch are warped around its mean shape to get shape free images. Based on local geometry preserving manifold learning method called locally linear embedding (LLE), a shape free pseudo-photo is synthesized by block matching. Then the photo of actual shape is constructed with the help of an Active Shape Model(ASM) and a neural network built on shape control point coordinate pair for training sketch-photo samples. We experimented over 300 sketch-photo image pairs and output synthesized photo for every test image is encouraging. � 2010 ACM.
Robust hand gesture recognition system using motion templates
(2011) Kulkarni, S.; Manoj, H.; Sumam, David S.; Madumbu, V.; Kumar, Y.S.
This paper presents a robust hand gesture analysis system. The approach uses the video analytic technique of motion templates rather than conventional gesture recognition algorithms. Also, it utilizes background modeling and skin pixel detection which further strengthens the approach by making it tolerant to background clutter and noise. In addition it reduces the false detections to a considerable extent. The system does not necessitate the user to wear any coloured caps or gloves for the hands. Encouraging results were obtained and it was found that the methodology is flexible and can be manipulated to suit gesture based interaction as per the requirements of a system. It can also be implemented as a standalone system. � 2011 IEEE.
Robust hand gesture recognition system using motion templates
(2011) Kulkarni, S.; Manoj, H.; Sumam David, S.; Madumbu, V.; Kumar, Y.S.
This paper presents a robust hand gesture analysis system. The approach uses the video analytic technique of motion templates rather than conventional gesture recognition algorithms. Also, it utilizes background modeling and skin pixel detection which further strengthens the approach by making it tolerant to background clutter and noise. In addition it reduces the false detections to a considerable extent. The system does not necessitate the user to wear any coloured caps or gloves for the hands. Encouraging results were obtained and it was found that the methodology is flexible and can be manipulated to suit gesture based interaction as per the requirements of a system. It can also be implemented as a standalone system. Â© 2011 IEEE.