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Results for "Ayush Gupta"

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Optimal Cost Almost-sure Reachability in POMDPsNov 14 2014We consider partially observable Markov decision processes (POMDPs) with a set of target states and every transition is associated with an integer cost. The optimization objective we study asks to minimize the expected total cost till the target set is ... More
Mathematical Sensemaking as Seeking Coherence between Calculations and Concepts: Instruction and Assessments for Introductory PhysicsMar 13 2019Mar 18 2019What kind of problem-solving instruction can help students apply what they have learned to solve the new and unfamiliar problems they will encounter in the future? We propose that mathematical sensemaking, the practice of seeking coherence between formal ... More
Making Meaning with Math in Physics: A semantic analysisFeb 02 2010Physics makes powerful use of mathematics, yet the way this use is made is often poorly understood. Professionals closely integrate their mathematical symbology with physical meaning, resulting in a powerful and productive structure. But because of the ... More
Fault Tolerant and Fully Dynamic DFS in Undirected Graphs: Simple Yet EfficientOct 03 2018We present an algorithm for a fault tolerant Depth First Search (DFS) Tree in an undirected graph. This algorithm is drastically simpler than the current state-of-the-art algorithms for this problem, uses optimal space and optimal preprocessing time, ... More
Incorporating Disciplinary Practices Into Characterizations of Progress in Responsive TeachingFeb 16 2015Responsive teaching, in which teachers adapt instruction based on close attention to the substance of students' ideas, is typically characterized along two dimensions: the level of detail at which teachers attend and respond to students' ideas, and the ... More
Where to find the mind: Identifying the scale of cognitive dynamicsMar 02 2010There are ongoing divisions in the learning sciences between perspectives that treat cognition as occurring within individual minds and those that treat it as irreducibly distributed or situated in material and social contexts. We contend that accounts ... More
How substance-based ontologies for gravity can be productive: A case studyMay 06 2013Many science education researchers have argued that learners' commitment to a substance (matter-based) ontology impedes the learning of scientific concepts that scientists typically conceptualize as processes or interactions, such as such as force, electric ... More
Toward affect-inclusive models of cognitive dynamics: Coupling epistemological resources and emotionsJul 04 2013Many prominent lines of research on student's reasoning and conceptual change within learning sciences and physics education research have not attended to the role of learners' affect or emotions in the dynamics of their conceptual reasoning. This is ... More
The Case for Dynamic Models of Learners' Ontologies in PhysicsFeb 28 2008Mar 01 2010In a series of well-known papers, Chi and Slotta (Chi, 1992; Chi & Slotta, 1993; Chi, Slotta & de Leeuw, 1994; Slotta, Chi & Joram, 1995; Chi, 2005; Slotta & Chi, 2006) have contended that a reason for students' difficulties in learning physics is that ... More
Coordination of Mathematics and Physical Resources by Physics Graduate StudentsFeb 29 2008We investigate the dynamics of how graduate students coordinate their mathematics and physics knowledge within the context of solving a homework problem for a plasma physics survey course. Students were asked to obtain the complex dielectric function ... More
Convolution and Product Theorem for the Special Affine Fourier TransformJun 24 2015The Special Affine Fourier Transform or the SAFT generalizes a number of well known unitary transformations as well as signal processing and optics related mathematical operations. Unlike the Fourier transform, the SAFT does not work well with the standard ... More
Design and Development of Underwater Vehicle: ANAHITAMar 01 2019Anahita is an autonomous underwater vehicle which is currently being developed by interdisciplinary team of students at Indian Institute of Technology(IIT) Kanpur with aim to provide a platform for research in AUV to undergraduate students. This is the ... More
Applying Conceptual Blending to Model Coordinated Use of Multiple Ontological MetaphorsDec 04 2014Dec 05 2014Energy is an abstract science concept, so the ways that we think and talk about energy rely heavily on ontological metaphors: metaphors for what kind of thing energy is. Two commonly used ontological metaphors for energy are energy as a substance and ... More
Qualitative Analysis of POMDPs with Temporal Logic Specifications for Robotics ApplicationsSep 11 2014Feb 18 2015We consider partially observable Markov decision processes (POMDPs), that are a standard framework for robotics applications to model uncertainties present in the real world, with temporal logic specifications. All temporal logic specifications in linear-time ... More
"Classical-ish": Negotiating the boundary between classical and quantum particlesJul 02 2015Quantum mechanics can seem like a departure from everyday experience of the physical world, but constructivist theories assert that learners build new ideas from their existing ones. To explore how students can navigate this tension, we examine video ... More
'Because math': Epistemological stance or defusing social tension in QM?Jul 02 2015In collaborative small-group work, physics students need to both manage social conflict and grapple with conceptual and epistemological differences. In this paper, we document several outlets that students use as tools for managing social conflict when ... More
Shift-Invariant and Sampling Spaces Associated with the Special Affine Fourier TransformJan 21 2016The Special Affine Fourier Transformation or the SAFT generalizes a number of well known unitary transformations as well as signal processing and optics related mathematical operations. Shift-invariant spaces also play an important role in sampling theory, ... More
The Dynamics of Students' Behaviors and Reasoning during Collaborative Physics Tutorial SessionsMar 03 2008We investigate the dynamics of student behaviors (posture, gesture, vocal register, visual focus) and the substance of their reasoning during collaborative work on inquiry-based physics tutorials. Scherr has characterized student activity during tutorials ... More
Mathematical Sensemaking as Seeking Coherence between Calculations and Concepts: Instruction and Assessments for Introductory PhysicsMar 13 2019What kind of problem-solving instruction can help students apply what they have learned to solve the new and unfamiliar problems they will encounter in the future? We propose that mathematical sensemaking, the practice of seeking coherence between formal ... More
How students blend conceptual and formal mathematical reasoning in solving physics problemsFeb 16 2011Dec 05 2013Current conceptions of expert problem solving depict physical/conceptual reasoning and formal mathematical reasoning as separate steps: a good problem solver first translates a physical Current conceptions of quantitative problem-solving expertise in ... More
"Bring it on": Explaining persistence in science at the intersection of identity and epistemologyFeb 16 2015Research has documented a sharp decline in students' interest and persistence in science, starting in middle school, particularly among students from underrepresented populations. In working to address this problem, we can learn a great deal from positive ... More
Low Tension Strings on a Cosmological SingularityMay 15 2014Sep 21 2014It has recently been argued that the singularity of the Milne orbifold can be resolved in higher spin theories. In string theory scattering amplitudes, however, the Milne singularity gives rise to ultraviolet divergences that signal uncontrolled backreaction. ... More
Super-Resolution in Phase SpaceJan 30 2015This work considers the problem of super-resolution. The goal is to resolve a Dirac distribution from knowledge of its discrete, low-pass, Fourier measurements. Classically, such problems have been dealt with parameter estimation methods. Recently, it ... More
Unsupervised Histopathology Image SynthesisDec 13 2017Hematoxylin and Eosin stained histopathology image analysis is essential for the diagnosis and study of complicated diseases such as cancer. Existing state-of-the-art approaches demand extensive amount of supervised training data from trained pathologists. ... More
Weaver: A High-Performance, Transactional Graph Database Based on Refinable TimestampsSep 28 2015Jun 20 2016Graph databases have become an increasingly common infrastructure component. Yet existing systems either operate on offline snapshots, provide weak consistency guarantees, or use expensive concurrency control techniques that limit performance. In this ... More
Joint Resource Allocation for OFDMA based Overlay Cognitive Radio Networks under Stochastic Rate ConstraintApr 01 2016This work presents joint subcarrier, power and bit allocation schemes for multi-user OFDM based overlay cognitive radio under constraints on primary user throughput loss and total secondary user transmitted power. Closed form for expressions for the optimal ... More
Bidirectional Conditional Generative Adversarial NetworksNov 20 2017Nov 03 2018Conditional Generative Adversarial Networks (cGANs) are generative models that can produce data samples ($x$) conditioned on both latent variables ($z$) and known auxiliary information ($c$). We propose the Bidirectional cGAN (BiCoGAN), which effectively ... More
ReDecode Framework for Iterative Improvement in Paraphrase GenerationNov 11 2018Generating paraphrases, that is, different variations of a sentence conveying the same meaning, is an important yet challenging task in NLP. Automatically generating paraphrases has its utility in many NLP tasks like question answering, information retrieval, ... More
Decay of Cosmic String Loops Due to Particle RadiationMar 12 2019Constraints on the tension and the abundance of cosmic strings depend crucially on the rate at which they decay into particles and gravitational radiation. We study the decay of cosmic string loops in the Abelian-Higgs model by performing field theory ... More
Dimensional and temperature dependence of metal insulator transition in correlated and disordered systemsMar 17 2008Mar 25 2010We study the dimensional dependence of the interplay between correlation and disorder in two dimension at half filling using 2D $t-t'$ disordered Hubbard model with deterministic disorder both at zero and finite temperatures. Inclusion of $t'$ without ... More
Is Second Law of Thermodynamics Violated for Electron Transition from Lower-Energy Level to Higher-Energy LevelOct 05 2003Second law of thermodynamics is applied to a few electronic processes. It is seen that the second law of thermodynamics holds good for all except one mentioned here. The classical approach, based on exact equivalence of emission and absorption spectra, ... More
Approximation algorithms for Capacitated Facility Location Problem with PenaltiesAug 21 2014Sep 12 2014In this paper, we address the problem of capacitated facility location problem with penalties (CapFLPP) paid per unit of unserved demand. In case of uncapacitated FLP with penalties demands of a client are either entirely met or are entirely rejected ... More
Commutativity and spectral properties of $k^{th}$-order slant little Hankel operators on the Bergman spaceDec 18 2017In this paper, we introduce the notion of $k^{th}$-order slant little Hankel operator on the Bergman space with essentially bounded harmonic symbols on the unit disc and obtain its algebraic and spectral properties. We have also discussed the conditions ... More
Hankel operators on the Fock-Sobolev spacesJun 07 2018In this paper, we study operator-theoretic properties (boundedness and compactness) of Hankel operators on the Fock-sobolev spaces $ \mathscr{F}^{p,m} $ in terms of $ \mathcal{BMO}_r^p $ and $ \mathcal{VMO}_r^p $ spaces, respectively, for a non-negative ... More
The Appearance of Tau Neutrinos from a Gamma Ray BurstMay 27 2002Jun 17 2002The muon neutrinos from the Gamma Ray Bursts(GRBs) during their propagation oscillate to tau neutrinos. The tau neutrinos can be identified by the appearance of tau leptons which decay to muons below the detector. We examine the prospect of detecting ... More
Kalman Filtering in the Presence of State Space Equality ConstraintsMay 31 2007We discuss two separate techniques for Kalman Filtering in the presence of state space equality constraints. We then prove that despite the lack of similarity in their formulations, under certain conditions, the two methods result in mathematically equivalent ... More
Very High Energy Antineutrinos from Photo-disintegration of Cosmic Ray NucleiMar 14 2015Aug 27 2015The photo-disintegration of cosmic ray nuclei by starlight leads to the production of secondary antineutrinos. We have assumed that the flux of the ultrahigh energy cosmic ray nuclei near the Galactic plane region is the same as that observed near the ... More
A modification of the relativistic energy-momentum relationApr 19 2012Jun 29 2012A modification of the accepted relativistic energy momentum relation is suggested. The new relation allows massive particles to have a maximum velocity c(m) greater than the velocity of light c. The effect of the modification suggested here would be most ... More
Formation of the Moon: a new mechanismFeb 01 2014Understanding the Moon's formation mechanism is necessary for studying not only the Moon itself, but also the evolution, formation, habitability, and structure of other planets and the moons in the Solar system and in extrasolar planetary systems. In ... More
Limits of harmonic maps and crowned hyperbolic surfacesMay 10 2018We consider harmonic diffeomorphisms to a fixed hyperbolic target $Y$, from a family of domain Riemann surfaces degenerating along a Teichm\"{u}ller ray. We use the work of Minsky to show that there is a limiting harmonic map from the conformal limit ... More
On Zariski's Cancellation Problem in positive characteristicSep 05 2013In this paper we shall show that when k is a field of positive characteristic the affine space A^n_k is not cancellative for any n greater than 2.
A Counter-example to the Cancellation Problem for the Affine Space A^3 in characteristic pAug 02 2012Jan 23 2013We show that the Cancellation Conjecture does not hold for the affine space A^3_k over any field k of positive characteristic. We prove that an example of T. Asanuma provides a three-dimensional k-algebra A for which A is not isomorphic to k[X_1,X_2,X_3] ... More
Ascent and descent of the Golod property along algebra retractsNov 30 2015Aug 06 2017We study ascent and descent of the Golod property along an algebra retract. We characterise trivial extensions of modules, fibre products of rings to be Golod rings. We present a criterion for a graded module over a graded affine algebra of characteristic ... More
Cascade Markov Decision Processes: Theory and ApplicationsSep 01 2015This paper considers the optimal control of time varying continuous time Markov chains whose transition rates are themselves Markov processes. In one set of problems the solution of an ordinary differential equation is shown to determine the optimal performance ... More
A Strong threshold for the size of random caps to cover a sphereSep 06 2008In this article, we consider `$N$'spherical caps of area $4\pi p$ were uniformly distributed over the surface of a unit sphere. We are giving the strong threshold function for the size of random caps to cover the surface of a unit sphere. We have shown ... More
Vertex Degree of Random Geometric Graph on Exponentially Distributed PointsSep 07 2006Let $X_1,X_2,...$ be an infinite sequence of i.i.d. random vectors distributed exponentially with parameter $\lam .$ For each $y$ and $n\geq 1,$ form a graph $G_n(y)$ with vertex set $V_n = \{X_1,...,X_n\},$ two vertices are connected if and only if edge ... More
The QCD EoS from simulations on BlueGene L Supercomputers at LLNL and NYBlueOct 09 2008We present results for the QCD Equation of State (EoS) obtained using simulations of lattice QCD at zero chemical potential. Our high statistics results compare improved asqtad and p4fat3 staggered quarks on lattices with a temporal extent N_tau = 6 and ... More
Spectrum of Mesons and Baryons with $b$ QuarksOct 20 1999We present highlights of the spectrum of mesons and baryons calculated using NRQCD for heavy quarks and tadpole improved clover action for the light quarks.
Prospects of calculating $ε_K$ and $ε'$ from lattice QCDAug 23 1999An overview of lattice results for the strange quark mass, $B_K$, $B_6$, $B_7$, and $B_8$ is presented. I give my assessment of the reliability of various estimates and prospects for future improvements.
Prospects of Solving Grand Challenge ProblemsJan 17 1995The recent woes of the supercomputer industry and changes in federal funding have caused some scientists to re-evaluate the means by which they hope to solve Grand Challenge problems. I evaluate the potential of Massively Parallel Processors (MPP) within ... More
General Physics Motivations for Numerical Simulations of Quantum Field TheoryMay 20 1999In this introductory article a brief description of Quantum Field Theories (QFT) is presented with emphasis on the distinction between strongly and weakly coupled theories. A case is made for using numerical simulations to solve QCD, the regnant theory ... More
Introduction to Lattice QCDJul 11 1998These notes aim to provide a pedagogical introduction to Lattice QCD. The topics covered include the scope of LQCD calculations, lattice discretization of gauge and fermion (naive, Wilson, and staggered) actions, doubling problem, improved gauge and Dirac ... More
The Contribution of Novel CP Violating Operators to the nEDM using Lattice QCDJan 16 2017In this talk, we motivate the calculation of the matrix elements of novel CP violating operators, the quark EDM and the quark chromo EDM operators, within the nucleon state using lattice QCD. These matrix elements, combined with the bound on the neutron ... More
Web Mining using Artificial Ant Colonies: A SurveyApr 16 2014Web mining has been very crucial to any organization as it provides useful insights to business patterns. It helps the company to understand its customers better. As the web is growing in pace, so is its importance and hence it becomes all the more necessary ... More
Implementation of an efficient RBAC in Cloud Computing using .NET environmentMar 09 2014Cloud Computing is flourishing day by day and it will continue in developing phase until computers and internet era is in existence. While dealing with cloud computing, a number of security and traffic related issues are confronted. Load Balancing is ... More
Equation of State and the Finite Temperature Transition in QCDDec 07 2009This talk provides a summary of the results obtained by the HotQCD collaboration on the equation of state and the crossover transition in 2+1 flavor QCD. We investigate bulk thermodynamic quantities - energy density, pressure, entropy density, and the ... More
Underlying Event Measurements at CMSNov 02 2017Nov 09 2017Measurements of Underlying Event activity using proton-proton collision data collected by the CMS detector will be presented. To check the energy dependence of the underlying event activity, results are compared with previous measurements from different ... More
The Fleming-Viot limit of an interacting spatial population with fast density regulationApr 13 2012Dec 20 2012We consider population models in which the individuals reproduce, die and also migrate in space. The population size scales according to some parameter $N$, which can have different interpretations depending on the context. Each individual is assigned ... More
Bootstrapping Conversational Agents With Weak SupervisionDec 14 2018Many conversational agents in the market today follow a standard bot development framework which requires training intent classifiers to recognize user input. The need to create a proper set of training examples is often the bottleneck in the development ... More
Resolving Multi-path Interference in Time-of-Flight Imaging via Modulation Frequency Diversity and Sparse RegularizationApr 03 2014Time-of-flight (ToF) cameras calculate depth maps by reconstructing phase shifts of amplitude-modulated signals. For broad illumination or transparent objects, reflections from multiple scene points can illuminate a given pixel, giving rise to an erroneous ... More
Dynamics of Trust Reciprocation in Heterogenous MMOG NetworksMar 26 2013Apr 19 2013Understanding the dynamics of reciprocation is of great interest in sociology and computational social science. The recent growth of Massively Multi-player Online Games (MMOGs) has provided unprecedented access to large-scale data which enables us to ... More
Graph-based Neural Multi-Document SummarizationJun 20 2017Aug 23 2017We propose a neural multi-document summarization (MDS) system that incorporates sentence relation graphs. We employ a Graph Convolutional Network (GCN) on the relation graphs, with sentence embeddings obtained from Recurrent Neural Networks as input node ... More
A Novel General Theoretical Derivation of Newton-Experimental-Formula for Collision of ParticlesJun 13 2005An experimental formula, sometimes named as Newton-collision-formula, (v1-v2) = - e.(u1-u2) relating relative-velocities before & after impact of two bodies under linear-collision, is commonly used successfully for study of collision-dynamics. Although ... More
Representations of the $n$ dimensional quantum torusMay 02 2015The $n$-dimensional quantum torus $\mathcal O_{\mathbf q}((F^\times)^n)$ is defined as the associative $F$-algebra generated by $x_1, \cdots, x_n$ together with their inverses satisfying the relations $x_ix_j = q_{ij}x_jx_i$, where $\mathbf q = (q_{ij})$. ... More
Electric field effects on Landau levels in multi- Weyl semimetalsOct 25 2016Multi-Weyl semimetals are characterized by anisotropic non-linear dispersion along 2-D plane and a linear dispersion in orthogonal direction. They have topological charge $n$ and are produced when two or multiple Weyl nodes with nonzero net monopole charge ... More
Ultrahigh Energy Cosmic Rays from Gamma Ray Bursts: Implications of the Recent Observational Results by MilagroJun 03 2004Oct 07 2004It has been speculated earlier that Gamma Ray Bursts are sources of ultrahigh energy cosmic rays. Recently, the search for high energy photons from Gamma Ray Bursts by Milagro group has put limits on the isotropic luminosity of these transient sources ... More
Neutrino Induced Upward Going Muons from a Gamma Ray Burst in a Neutrino Telescope of Km^2 AreaJan 30 2002Apr 17 2002The number of neutrino induced upward going muons from a single Gamma Ray Burst (GRB) expected to be detected by the proposed kilometer scale IceCube detector at the South Pole location has been calculated. The effects of the Lorentz factor, total energy ... More
Galactic PeV NeutrinosMay 17 2013Jul 16 2013IceCube experiment has detected two neutrinos with energies beween 1-10 PeV. They might have originated from Galactic or extragalactic sources of cosmic rays. In the present work we consider hadronic interactions of the diffuse very high energy cosmic ... More
Generalized Lorentz TransformationsMay 22 2013Dec 05 2013Generalized Lorentz transformations with modified velocity parameter are considered. Lorentz transformations depending on the mass of the observer are suggested.The modified formula for the addition of velocities remarkably preserves the constancy of ... More
A comment on "Tripartite entanglement versus tripartite nonlocality in 3-qubit GHZ-class states"Jul 25 2014The paper titled "Tripartite entanglement versus tripartite nonlocality in 3-qubit GHZ-class states", (Physical Review Letters 102, 250404 (2009)), does very important work on studying the nature of Svetlichny Inequalities (which are Bell-type inequalities) ... More
Event Search and Analytics: Detecting Events in Semantically Annotated Corpora for Search and AnalyticsMar 01 2016In this article, I present the questions that I seek to answer in my PhD research. I posit to analyze natural language text with the help of semantic annotations and mine important events for navigating large text corpora. Semantic annotations such as ... More
Amplitude-Equalized Microwave C-SectionApr 06 2016An active microwave C-section is proposed which provides a flat magnitude transmission in a wide frequency band along with a frequency-dependent group delay response considering practical dissipation losses. The key lies in integrating a constant gain ... More
Synthesis of Sequential Reversible Circuits through Finite State MachineOct 09 2014Jan 07 2015Reversible computing has attracted the attention of researchers due to its low power consumption and less heat dissipation compared to conventional computing. A number of reversible gates have been proposed by different researchers and various combinational ... More
Pipelined Workflow in Hybrid MPI/Pthread runtime for External Memory Graph ConstructionOct 31 2012Graph construction from a given set of edges is a data-intensive operator that appears in social network analysis, ontology enabled databases, and, other analytics processing. The operator represents an edge list to compressed sparse row (CSR) representation ... More
Dissipation, hydrodynamics and the fireballJul 18 2005We investigate the hydrodynamics of the QCD plasma using dimensionless numbers built from the thermodynamics and transport theory of the plasma and characteristic dimensions of the fireball produced in heavy-ion collisions. We find that by the usual measures, ... More
A transport coefficient: the electrical conductivityApr 30 2005I describe the lattice determination of the electrical conductivity of the quark gluon plasma. Since this is the first extraction of a transport coefficient with a degree of control over errors, I next use this to make estimates of other transport related ... More
Critical HysteresisMar 25 1993Hysteresis is observed at second order phase transitions. Universal scaling formul\ae{} for the areas of hysteresis loops are written down. Critical exponents are defined, and related to other exponents for static and dynamic critical phenomena. These ... More
Critical behaviour in QCD at finite isovector chemical potentialFeb 05 2002We report an investigation of criticality in QCD at finite isovector chemical potential, mu_3, and at zero temperature. At the critical point, mu_3^c = m_pi, we find that an uncharged scalar and pseudoscalar and a charged pseudoscalar meson become massless ... More
A precise determination of T_c in QCD from scalingOct 09 2000Apr 02 2001Existing lattice data on the QCD phase transition are analyzed in renormalized perturbation theory. In quenched QCD it is found that T_c scales for lattices with only 3 time slices, and that T_c/Lambda_msbar=1.15 \pm 0.05. A preliminary estimate in QCD ... More
Jet Missing PT for Quark-Gluon Plasma ThermometryJan 18 1995At the LHC, where hard multi-jet events are common, large imbalances in the total jet-\pt{} can arise due to the interaction of jets with the plasma formed in heavy-ion collisions. We find that this missing-\pt{} spectrum yields a measurement of the initial ... More
Characterization of Performance Anomalies in HadoopMay 08 2015May 13 2015With the huge variety of data and equally large-scale systems, there is not a unique execution setting for these systems which can guarantee the best performance for each query. In this project, we tried so study the impact of different execution settings ... More
Vertex Degree of Random Intersection GraphSep 06 2008A random intersection graph is constructed by independently assigning a subset of a given set of objects $W,$ to each vertex of the vertex set $V$ of a simple graph $G.$ There is an edge between two vertices of $V,$ iff their respective subsets(in $W$,) ... More
Number of Edges in Random Intersection Graph on Surface of a SphereSep 06 2008In this article, we consider `$N$'spherical caps of area $4\pi p$ were uniformly distributed over the surface of a unit sphere. We study the random intersection graph $G_N$ constructed by these caps. We prove that for $p = \frac{c}{N^{\al}},\:c >0$ and ... More
Status of B_K from Lattice QCDMar 17 2003A brief review of lattice calculations of the bag parameter B_K relevant for understanding indirect CP violation in the neutral kaon sector is given. A status report on current state-of-the-art calculations is presented as well as a discussion of the ... More
Self-supervised Multi-level Face Model Learning for Monocular Reconstruction at over 250 HzDec 07 2017Mar 29 2018The reconstruction of dense 3D models of face geometry and appearance from a single image is highly challenging and ill-posed. To constrain the problem, many approaches rely on strong priors, such as parametric face models learned from limited 3D scan ... More
Vote Aggregation as a Clustering ProblemNov 16 2016An important way to make large training sets is to gather noisy labels from crowds of non experts. We propose a method to aggregate noisy labels collected from a crowd of workers or annotators. Eliciting labels is important in tasks such as judging web ... More
Approximating Wisdom of Crowds using K-RBMsNov 16 2016Nov 17 2016An important way to make large training sets is to gather noisy labels from crowds of non experts. We propose a method to aggregate noisy labels collected from a crowd of workers or annotators. Eliciting labels is important in tasks such as judging web ... More
Gamma Rays from Centaurus AApr 18 2008May 30 2008Centaurus A, the cosmic ray accelerator a few Mpc away from us is possibly one of the nearest sources of extremely high energy cosmic rays. We investigate whether the gamma ray data currently available from Centaurus A in the GeV-TeV energy band can be ... More
EMBANKS: Towards Disk Based Algorithms For Keyword-Search In Structured DatabasesApr 22 2011In recent years, there has been a lot of interest in the field of keyword querying relational databases. A variety of systems such as DBXplorer [ACD02], Discover [HP02] and ObjectRank [BHP04] have been proposed. Another such system is BANKS, which enables ... More
A study of the appearance of tau neutrinos from a gamma ray burst by detecting their horizontal electromagnetic showersMay 30 2003Jul 22 2003We explore the possibilty of detecting horizontal electromagnetic showers of tau neutrinos from individual gamma ray bursts, in large scale detectors like HiRes and Telescope Array. We study the role of the parameters of a gamma ray burst in determining ... More
On the Gamma Ray Burst Origin of Extremely Energetic Cosmic RaysMar 27 2009Air shower experiments have detected cosmic ray events of energies upto 300 EeV. Most likely these cosmic rays have originated from compact objects. Their exact sources are yet to be identified. It has been suggested before that gamma ray bursts are possible ... More
Analysis of Pre- and Post-Monsoon Suspended Sediments in the Gulf of Kachchh, India Using Remote SensingMar 28 2015A comprehensive study of satellite-derived suspended sediment concentration (SSC) during pre- and post-monsoon has been conducted with full-month cycles of tidal responses to study the suspended sediment dynamics in the Gulf of Kachchh. Tidal data were ... More
Ascent and descent of the Golod property along algebra retractsNov 30 2015We study ascent and descent of the Golod property along an algebra retract. We characterise trivial extensions of modules, fibre products of rings to be Golod rings. We show that the Golod property transfers along large homomorphisms. We present a criterion ... More
Novel Symmetries in Vector Schwinger ModelDec 22 2013Mar 31 2014We derive nilpotent and absolutely anticommuting (anti-)co-BRST symmetry transformations for the bosonized version of (1+1)-dimensional (2D) vector Schwinger model. These symmetry transformations turn out to be the analogue of co-exterior derivative of ... More
Phases and properties of quark matterJun 13 2008I review recent developments in finite temperature lattice QCD which are useful for the study of heavy-ion collisions. I pay particular attention to studies of the equation of state and the light they throw on conformal symmetry and the large N_c limit, ... More
Electronic structure of a single vortex in d-wave superconductor revisitedMay 08 2012The present work deals with the study of d-wave superconductor in presence of a single vortex placed at the centre of the 2D lattice using the $t-t'-J$ model within the renormalized mean field theory. It is found that the in absence of the vortex the ... More
Non-Gaussianity from Warm Inflation in the Weak Dissipative RegimeOct 16 2003The generic prediction for the perturbations generated during slow--roll, single--field inflation, as they appear in the cosmic microwave background (CMB), is a flat, close--to--Gaussian spectrum. We calculate the general solution for a warm inflationary ... More
Dynamics and Non-Gaussianity in the Weak-Dissipative Warm Inflation ScenarioSep 22 2005Mar 31 2006We calculate the general solutions for a warm inflationary scenario with weak dissipation, reviewing the dissipative dynamics of the two-fluid system, and calculate the bispectrum of the gravitational field fluctuations generated in the case where dissipation ... More
The Quark Gluon Plasma: lattice computations put to experimental testMar 10 2003I describe how lattice computations are being used to extract experimentally relevant features of the quark gluon plasma. I deal specifically with relaxation times, photon emissivity, strangeness yields, event by event fluctuations of conserved quantities ... More
Instantons and Surface Tension at a First-Order TransitionOct 01 1993We study the dynamics of the first order phase transition in the two dimensional 15-state Potts model, both at and off equilibrium. We find that phase changes take place through nucleation in both cases, and finite volume effects are described well through ... More