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Search Results: 1 - 10 of 349694 matches for " C E Veni Madhavan "
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Measures for classification and detection in steganalysis
Sujit Gujar,C E Veni Madhavan
Computer Science , 2009,
Abstract: Still and multi-media images are subject to transformations for compression, steganographic embedding and digital watermarking. In a major program of activities we are engaged in the modeling, design and analysis of digital content. Statistical and pattern classification techniques should be combined with understanding of run length, transform coding techniques, and also encryption techniques.
Diversity in Ranking using Negative Reinforcement
Rama Badrinath,C. E. Veni Madhavan
Computer Science , 2012,
Abstract: In this paper, we consider the problem of diversity in ranking of the nodes in a graph. The task is to pick the top-k nodes in the graph which are both 'central' and 'diverse'. Many graph-based models of NLP like text summarization, opinion summarization involve the concept of diversity in generating the summaries. We develop a novel method which works in an iterative fashion based on random walks to achieve diversity. Specifically, we use negative reinforcement as a main tool to introduce diversity in the Personalized PageRank framework. Experiments on two benchmark datasets show that our algorithm is competitive to the existing methods.
Improving the Reliability of Detection of LSB Replacement Steganography
Shreelekshmi R,Wilscy M,C E Veni Madhavan
International Journal of Network Security & Its Applications , 2010,
Abstract: We propose a simple method for increasing the reliability of detection of LSB replacementsteganography. RS Steganalysis Method (RSM), Sample Pair Method (SPM), and Least Square Method(LSM) are three of the most reliable steganalysis methods in the literature for LSB replacementsteganography on digital images in spatial domain. However all these methods are prone to error. Wepropose a simple method to identify images which give very accurate results and images which givehighly inaccurate results by these methods. The novelty of our method is that it does not require anyknowledge about the cover images as the image classification is done based on certain statisticalproperties of the image, which are invariant with embedding. Thus it helps the steganalyst in attaching alevel of confidence to the estimation he makes and thereby increasing the reliability of steganalysis ofdigital images. It also helps to choose between images for more secure LSB replacement steganography.
A Navigation Algorithm Inspired by Human Navigation
Vijesh M.,Sudarshan Iyengar,Vijay Mahantesh,Amitash Ramesh,Veni Madhavan
Computer Science , 2011,
Abstract: Human navigation has been a topic of interest in spatial cognition from the past few decades. It has been experimentally observed that humans accomplish the task of way-finding a destination in an unknown environment by recognizing landmarks. Investigations using network analytic techniques reveal that humans, when asked to way-find their destination, learn the top ranked nodes of a network. In this paper we report a study simulating the strategy used by humans to recognize the centers of a network. We show that the paths obtained from our simulation has the same properties as the paths obtained in human based experiment. The simulation thus performed leads to a novel way of path-finding in a network. We discuss the performance of our method and compare it with the existing techniques to find a path between a pair of nodes in a network.
A Four-Unit-Cell Periodic Pattern of Quasiparticle States Surrounding Vortex Cores in Bi2Sr2CaCu2O8+d
J. E. Hoffman,E. W. Hudson,K. M. Lang,V. Madhavan,H. Eisaki,S. Uchida,J. C. Davis
Physics , 2002, DOI: 10.1126/science.1066974
Abstract: Scanning tunneling microscopy is used to image the additional quasiparticle states generated by quantized vortices in the high-Tc superconductor Bi2Sr2CaCu2O8+d. They exhibit a Cu-O bond oriented 'checkerboard' pattern, with four unit cell (4a0) periodicity and a ~30 angstrom decay length. These electronic modulations may be related to the magnetic field-induced, 8a0 periodic, spin density modulations of decay length ~70 angstroms recently discovered in La1.84Sr0.16CuO4. The proposed explanation is a spin density wave localized surrounding each vortex core. General theoretical principles predict that, in the cuprates, a localized spin modulation of wavelength L should be associated with a corresponding electronic modulation of wavelength L/2, in good agreement with our observations.
Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+x
K. M. Lang,V. Madhavan,J. E. Hoffman,E. W. Hudson,H. Eisaki,S. Uchida,J. C. Davis
Physics , 2001, DOI: 10.1038/415412a
Abstract: Granular superconductivity occurs when microscopic superconducting grains are separated by non-superconducting regions through which they communicate by Josephson tunneling to establish the macroscopic superconducting state [1]. Although crystals of the cuprate high-Tc superconductors are not granular in a structural sense, theory indicates that at low hole densities the holes can become concentrated at some locations resulting in hole-rich superconducting domains [2-5]. Granular superconductivity due to Josephson tunneling through 'undoped' regions between such domains would represent a new paradigm for the underdoped cuprates. Here we report studies of the spatial interrelationships between STM tunneling spectra in underdoped Bi2Sr2CaCu2O8+x. They reveal an apparent spatial segregation of the electronic structure into ~3nm diameter domains (with superconducting characteristics and local energy gap delta<50 meV) in an electronically distinct background. To explore whether this represents nanoscale segregation of two distinct electronic phases, we employ scattering-resonances at Ni impurity atoms [6] as 'markers' for the local existence of superconductivity [7-9]. No Ni-resonances are detected in any regions where delta>50(2.5) meV. These observations suggest that underdoped Bi2Sr2CaCu2O8+x is a mixture of two different short-range electronic orders with the long-range characteristics of a granular superconductor.
Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+d
E. W. Hudson,K. M. Lang,V. Madhavan,S. H. Pan,H. Eisaki,S. Uchida,J. C. Davis
Physics , 2001, DOI: 10.1038/35082019
Abstract: In conventional superconductors, magnetic interactions and magnetic impurity atoms are destructive to superconductivity. By contrast, in some unconventional systems, e.g. superfluid 3He and superconducting UGe2, superconductivity or superfluidity is actually mediated by magnetic interactions. A magnetic mechanism has also been proposed for high temperature superconductivity (HTSC) in which an electron magnetically polarizes its environment resulting in an attractive pairing-interaction for oppositely polarized spins. Since a magnetic impurity atom would apparently not disrupt such a pairing-interaction, it has also been proposed that the weaker influences on HTSC of magnetic Ni impurity atoms compared to those of non-magnetic Zn are evidence for a magnetic mechanism. Here we use scanning tunneling microscopy (STM) to determine directly the influence of individual Ni atoms on the electronic structure of Bi2Sr2CaCu2O8+d. Two local d-wave impurity-states are observed at each Ni. Analysis of their energies surprisingly reveals that the primary quasiparticle scattering effects of Ni atoms are due to non-magnetic interactions. Nonetheless, we also demonstrate that a magnetic moment coexists with unimpaired superconductivity at each Ni site. We discuss the implications of these phenomena, and those at Zn, for the pairing-mechanism.
Hemi-capsulo-rhombencephalic demyelination
Suresh Chandran C,Maheshwaran V,Unni Madhavan
Annals of Indian Academy of Neurology , 2010,
Rhinosporidial infection of the forehead -(report of a case)
Madhavan M,Ratnakar C,Mehdiratta K
Journal of Postgraduate Medicine , 1978,
Abstract: A cystic swelling over the right frontal bone above the medial half of the eyebrow in a 37 year old male was found to be caused by Rhinosporidium seeberi. The patient did not have any past or concurrent lesion which could be presumed to be due to Rhino-sporidiosis. The lesion was subcutaneous with overlying healthy skin and had caused erosion of underlying bone.
An Analysis of the Factors Affecting Students’ Adjustment at a University in Zimbabwe
Mutambara Julia,Bhebe Veni
International Education Studies , 2012, DOI: 10.5539/ies.v5n6p244
Abstract: This study provides insight into transition experiences and adjustment of students at a university in Zimbabwe. Research was based on students in the first three semesters of college. Based on prior research college adjustment was conceptualised in this study as involving personal, emotional, social and academic issues. The study was qualitative in nature and the descriptive research design using case study method was used. Structured and unstructured questionnaires were used to gather information. A sample of 115 students was selected using stratified random sampling from the faculty of social sciences. Findings from the study revealed that to a larger extent students were failing to adjust to college demands, this was compounded by the socioeconomic conditions prevailing in Zimbabwe.
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