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Results for "Rajesh Singh"

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Improved ratio type estimator using two auxiliary variables under second order approximationFeb 17 2014In this paper, we have proposed a new Ratio Type Estimator using auxiliary information on two auxiliary variables based on Simple random sampling without replacement (SRSWOR). The proposed estimator is found to be more efficient than the estimators constructed ... More
Multivariate dual to ratio type estimators using arithmetic, geometric and harmonic means in simple random samplingOct 13 2014Auxiliary variable is extensively used in survey sampling to improve the precision of estimates. Whenever there is availability of auxiliary information, we want to utilize it in the method of estimation to obtain the most efficient estimator. In this ... More
Efficient class of estimators for population median using auxiliary informationFeb 23 2014This article suggests an efficient class of estimators of population median of the study variable using an auxiliary variable. Asymptotic expressions of bias and mean square error of the proposed class of estimators have been obtained. Asymptotic optimum ... More
Method of estimation in the presence of non-response and measurement errors simultaneouslyApr 07 2014The present paper discusses the problem of estimating the finite population mean of study variable in simple random sampling in the presence of non response and response error together. The estimators in this article use auxiliary information to improve ... More
Information geometry of U(1) instantons on self-dual manifoldsAug 21 2006Jan 04 2007We use the information metric to investigate the moduli space of a U(1) instanton on (anti)self-dual manifolds, finding an $AdS$ geometry similar to that for the moduli space of a Yang-Mills instanton on flat space. We discuss our results from the perspective ... More
Hydrodynamically interrupted droplet growth in scalar active matterJul 10 2019Suspensions of spherical active particles often show microphase separation. At a continuum level, coupling their scalar density to fluid flow, there are two distinct explanations. Each involves an effective interfacial tension: the first mechanical (causing ... More
A family of estimators for estimating the population mean in simple random sampling under measurement errorsDec 04 2013In this article we have suggested an improved estimator for estimating the population mean in simple random sampling using auxiliary information under the presence of measurement errors. The mean square error (MSE) of the proposed estimator has been derived ... More
Optimum Statistical Test ProcedureApr 10 2009In this paper we obtain a test which minimizes the sum of the two error probabilities irrespective of whether $\sigma^2$ is known or unknown.
Study of some improved ratio type estimators using information on auxiliary attributes under second order approximationSep 12 2013Chakrabarty, Khoshnevisan, Sahai and Ray, Solanki suggested some estimators to estimate unknown population mean of the study variable. These authors discussed the estimators along with their first order biases and mean square errors(MSEs). In this paper, ... More
Improved estimator of finite population mean using auxiliary attribute in stratified random samplingJul 07 2014Aug 12 2014The present study discuss the problem of estimating the finite population mean using auxiliary attribute in stratified random sampling. In this paper taking the advantage of point bi-serial correlation between the study variable and auxiliary attribute, ... More
A blockchain based Secure and Trusted framework for Information Propagation on Online Social NetworksDec 26 2018The online social networks facilitate naturally for the users to share information. On these platforms, each user shares information based on his or her interests. The particular information being shared by a user may be legitimate or fake. Sometimes ... More
Fast Bayesian inference of the multivariate Ornstein-Uhlenbeck processJun 15 2017Jul 26 2018The multivariate Ornstein-Uhlenbeck process is used in many branches of science and engineering to describe the regression of a system to its stationary mean. Here we present an $O(N)$ Bayesian method to estimate the drift and diffusion matrices of the ... More
Congestion Control Technique Using Intelligent Traffic and VanetNov 16 2013Road traffic jams is a most important problem in nearly all cities around the world, especially in developing regions resulting in enormous delays, increased fuel wastage and monetary losses. In this paper, we have obtained an in-sight idea of simulating ... More
The Constraints and Spectra of a Deformed Quantum MechanicsApr 07 2012We examine a deformed quantum mechanics in which the commutator between coordinates and momenta is a function of momenta. The Jacobi identity constraint on a two-parameter class of such modified commutation relations (MCR's) shows that they encode an ... More
An Evaluation of Digital Image Forgery Detection ApproachesMar 29 2017Mar 30 2017With the headway of the advanced image handling software and altering tools, a computerized picture can be effectively controlled. The identification of image manipulation is vital in light of the fact that an image can be utilized as legitimate confirmation, ... More
Auxiliary Information and A Priori Values in Construction of Improved EstimatorsDec 01 2007This volume is a collection of six papers on the use of auxiliary information and 'a priori' values in construction of improved estimators. The work included here will be of immense application for researchers and students who emply auxiliary information ... More
Oriented collisions for cold synthesis of superheavy nucleiJul 12 2003The conditions of optimum orientations (lowest barrier and largest interaction radius) for deformed colliding nuclei are introduced in "cold" fusion of superheavy nuclei. Also, the role of (octupole and) hexadecupole deformations is studied. We have used ... More
Empirical Study in Finite Correlation Coefficient in Two Phase EstimationApr 17 2003This paper proposes a class of estimators for population correlation coefficient when information about the population mean and population variance of one of the variables is not available but information about these parameters of another variable (auxiliary) ... More
Econometric Analysis on Efficiency of EstimatorApr 16 2003This paper investigates the efficiency of an alternative to ratio estimator under the super population model with uncorrelated errors and a gamma-distributed auxiliary variable. Comparisons with usual ratio and unbiased estimators are also made.
Comment on "Growth Inside a Corner: The Limiting Interface Shape"Dec 05 2012We examine the conjectured asymptotic shape of the three dimensional corner growth model [Olejarz et. al.,PRL, 108, 016102 (2012)] by mapping the model onto a restricted solid on solid model on a triangular lattice. By choosing appropriate boundary conditions, ... More
Universal hydrodynamic mechanisms for crystallization in active colloidal suspensionsOct 20 2016The lack of detailed balance in active colloidal suspensions allows dissipation to determine stationary states. Here we show that slow viscous flow produced by polar or apolar active colloids near plane walls mediates attractive hydrodynamic forces that ... More
Universal hydrodynamic mechanisms for crystallization in active colloidal suspensionsOct 20 2016Nov 23 2016The lack of detailed balance in active colloidal suspensions allows dissipation to determine stationary states. Here we show that slow viscous flow produced by polar or apolar active colloids near plane walls mediates attractive hydrodynamic forces that ... More
A note on transformations on auxiliary variable in survey samplingOct 15 2012In this note, we address the doubts of Singh (2001) and Gupta and Shabbir (2008) on the transformations of auxiliary variables by adding unit free constants. The original contribution by Sisodia and Dwivedi (1981) is correct.
Improved estimator of population variance using information on auxiliary attribute in simple random samplingMar 02 2014Singh and Kumar (2011) suggested estimators for calculating population variance using auxiliary attributes. This paper proposes a family of estimators based on an adaptation of the estimators presented by Kadilar and Cingi (2004) and Singh et al. (2007), ... More
On Improvement in Estimating Population Parameter(s) Using Auxiliary InformationAug 27 2013The purpose of writing this book is to suggest some improved estimators using auxiliary information in sampling schemes like simple random sampling and systematic sampling. This volume is a collection of five papers. The following problems have been discussed ... More
A New Estimator For Population Mean Using Two Auxiliary Variables in Stratified random SamplingMar 31 2014In this paper, we suggest an estimator using two auxiliary variables in stratified random sampling. The propose estimator has an improvement over mean per unit estimator as well as some other considered estimators. Expressions for bias and MSE of the ... More
An alternative estimator for estimating the finite population mean in presence of measurement errorsMay 16 2014This article presents the problem of estimating the population mean using auxiliary information in the presence of measurement errors. A numerical study is made among the proposed estimator, the exponential ratio estimator, Singh and Solanki (2012) estimator ... More
An improved class of exponential ratio- type estimator in the presence of measurement errorsSep 10 2013In this paper we have suggested a family of estimators for the population mean in the presence of measurement errors. Expression for the mean squared error (MSE) of the suggested family is derived. An empirical study has been carried out to verify the ... More
A Family Of Estimators Of Population Mean Using Information On Point Bi-Serial and Phi Correlation CoefficientFeb 07 2013This paper deals with the problem of estimating the finite population mean when some information on two auxiliary attributes are available. It is shown that the proposed estimator is more efficient than the usual mean estimator and other existing estimators. ... More
The Pressure of Hot $g^2 φ^4$ Theory at order $g^5$Nov 08 1994The order $g^5$ contribution to the pressure of massless $g^2 \phi^4$ theory at nonzero temperature is obtained explicitly. Lower order contributions are reconsidered and two issues leading to the optimal choice of rearranged Lagrangian for such calculations ... More
Estimation of mean using dual-to-ratio and difference-type estimators under measurement error modelOct 28 2014In sample survey, when data is collected, it is assumed that whatever is reported by respondent is correct. However, given the issues of prestige bias, personal respect, respondents self reported data often produces over-or-under estimated values from ... More
Improved estimators in simple random sampling when study variable is an attributeDec 11 2013This article addresses the problem of estimating the population mean in the presence of auxiliary information when study variable itself is qualitative in nature. Bias and mean squared error (MSE) expressions of the class of estimators are derived up ... More
Direct verification of the fluctuation-dissipation relation in viscously coupled oscillatorsJul 03 2017Jul 04 2017The fluctuation-dissipation relation, a central result in non-equilibrium statistical physics, relates equilibrium fluctuations in a system to its linear response to external forces. Here we provide a direct experimental verification of this relation ... More
Collective clusterization effects in light heavy ion reactionsDec 18 2003The collective clusterization process, proposed for intermediate mass fragments (IMFs, 4$<$A$\le$28, 2$<$Z$\le$14) emitted from the hot and rotating compound nuclei formed in low energy reactions, is extended further to include also the emission of light ... More
A generalised family of ratio product estimator using transformation equationSep 13 2013In this paper we deal with the estimation of population variance of the study variable y using auxiliary information on variable x. A family of ratio and product-type estimators are proposed using suitable transformation on both random variable x(auxiliary ... More
Traction relations for active colloids and their applicationMar 18 2016Passive colloidal particles produce flow only when they are in motion in the ambient fluid. In contrast, active colloidal particles produce flow even when stationary in the fluid. This active flow mediates non-local many-body hydrodynamic interactions ... More
Unbiased Ratio-Type Estimator Using Transformed Auxiliary Variable In Negative Correlation CaseOct 06 2012The objective of this paper is to propose an unbiased ratio-type estimator for finite population mean when the variables are negatively correlated. Hartley and Ross[2] and Singh and Singh [6] estimators are identified as particular cases of the proposed ... More
Spatial ordering due to hydrodynamic interactions between a pair of colliding drops in a confined shearJan 14 2012Pair-collision between viscous drops in a confined shear is numerically simulated to show that the confinement drastically alters the trajectories of the drops. In contrast to free shear, drops here move towards the centerline giving rise to a zero cross-stream ... More
Difference-type estimators for estimation of mean in the presence of measurement errorApr 10 2014In this paper we have suggested difference-type estimator for estimation of population mean of the study variable y in the presence of measurement error using auxiliary information. The optimum estimator in the suggested estimator has been identified ... More
An improved estimator for population mean using auxiliary information in stratified random samplingJul 03 2014In the present study, we propose a new estimator for population mean of the study variable y in the case of stratified random sampling using the information based on auxiliary variable x. Expression for the mean squared error (MSE) of the proposed estimators ... More
A Note on Testing of HypothesisJan 06 2008In this paper, a problem of testing is discussed when the samples have been drawn from the normal distribution. The study of hypothesis testing is also extended to Baye's set up.
A general class of regression type estimators in systematic sampling under non-responseJun 26 2013In this paper we have proposed a general class of modified regression type estimator in systematic sampling under non-response to estimate the population mean using auxiliary information. The expressions of bias and mean square error (MSE) up to the first ... More
An Improved Estimator In Systematic SamplingJul 19 2013In this paper we have adapted Bahl and Tuteja (1991) estimator in systematic sampling using auxiliary information. Using Bedi (1996) transformation an improved estimator is also proposed under systematic sampling. The expressions of bias and mean square ... More
Multi-Avalanche Correlations in Directed Sandpile ModelsOct 31 2008Multiple avalanches, initiated by simultaneously toppling neighbouring sites, are studied in three different directed sandpile models. It is argued that, while the single avalanche exponents are different for the three models, a suitably defined two-avalanche ... More
Guessing under source uncertaintyMar 16 2006Sep 08 2006This paper considers the problem of guessing the realization of a finite alphabet source when some side information is provided. The only knowledge the guesser has about the source and the correlated side information is that the joint source is one among ... More
A Function Fitting MethodNov 04 2018Jan 19 2019In this article we describe a function fitting method that has potential applications to machine learning and prove relevant theorems. This function fitting method is a convex minimization problem and can be solved using a gradient descent algorithm. ... More
Spin polarisation by external magnetic fields, Aharonov-Bohm flux strings, and chiral symmetry breaking in QED$_3$Jun 09 1995In the first part, the induced vacuum spin around an Aharonov-Bohm flux string in massless three-dimensional QED is computed explicitly and the result is shown to agree with a general index theorem. A previous observation in the literature, that the presence ... More
Use of Auxiliary Information in Variance EstimationSep 02 2013This paper proposes a class of ratio type estimators of finite population variance, when the population variance of an auxiliary character is known. Asymptotic expression for mean square error (MSE) is derived and compared with the mean square errors ... More
Phase-plane analysis of driven multi-lane exclusion modelsAug 24 2012We show how a fixed point based boundary-layer analysis technique can be used to obtain the steady-state particle density profiles of driven exclusion processes on two-lane systems with open boundaries. We have considered two distinct two-lane systems. ... More
Improved Family of Estimators of Population Mean in Simple Random SamplingAug 27 2013In this paper, a procedure is given for estimating the population mean in simple random sampling without replacement in the presence of auxiliary information. The mean squared error expressions of the proposed estimators have been derived under large ... More
Generalized class of estimators for finite population mean when study variable is qualitative in natureSep 16 2014This paper suggests a generalized class of estimators for population mean of the qualitative study variable in simple random sampling using information on an auxiliary variable. Asymptotic expressions of bias and mean square error of the proposed class ... More
A family of median based estimators in simple random samplingApr 10 2014In this paper we have proposed a median based estimator using known value of some population parameter(s) in simple random sampling. Various existing estimators are shown particular members of the proposed estimator. The bias and mean squared error of ... More
Dilation-commuting operators on power-weighted Orlicz classesAug 04 2017Let $\Phi_1$ and $\Phi_2$ be nondecreasing functions from $\mathbb{R_+}=(0,\infty)$ onto itself. For $i=1,2$ and $\gamma \in \mathbb{R}$, define the Orlicz class $L_{\Phi_{i}}(\mathbb{R_+})$ to be the set of Lebesgue-measurable functions $f$ on $\mathbb{R_+}$ ... More
A sharp form of the Marcinkiewicz Interpolation Theorem for Orlicz spacesNov 25 2017An extension of Marcinkiewicz Interpolation Theorem, allowing intermediate spaces of Orlicz type, is proved. This generalization yields a necessary and sufficient condition so that every quasilinear operator, which maps the set, $S(X,\mu)$, of all $\mu$-measurable ... More
Exponential ratio-product type estimators under second order approximation in stratified random samplingApr 08 2014Singh et al (20009) introduced a family of exponential ratio and product type estimators in stratified random sampling. Under stratified random sampling without replacement scheme, the expressions of bias and mean square error (MSE) of Singh et al (2009) ... More
Almost unbiased estimator using Known Value of Population Parameter (s) in Sample SurveysMay 16 2014In this paper we have proposed an almost unbiased estimator using known value of some population parameter(s). A class of estimators is defined which includes Singh and Solanki [1] and Sahai and Ray [2], Sisodia and Dwivedi [3], Singh et. al. [4], Upadhyaya ... More
Combined Base Station Association and Power Control in Multi-channel Cellular NetworksDec 08 2011A combined base station association and power control problem is studied for the uplink of multichannel multicell cellular networks, in which each channel is used by exactly one cell (i.e., base station). A distributed association and power update algorithm ... More
Many-body microhydrodynamics of colloidal particles with active boundary layersNov 02 2014Jul 13 2015Colloidal particles with active boundary layers - regions surrounding the particles where nonequilibrium processes produce large velocity gradients - are common in many physical, chemical and biological contexts. The velocity or stress at the edge of ... More
Time variability of viscosity parameter in differentially rotating discsOct 14 2013Feb 13 2014We propose a mechanism to produce fluctuations in the viscosity parameter ($\alpha$) in differetially rotating discs. We carried out a nonlinear analysis of a general accretion flow, where any perturbation on the background $\alpha$ was treated as a passive/slave ... More
An almost unbiased estimator for population mean using known value of population parameter(s)May 31 2014In this paper we have proposed an almost unbiased estimator using known value of some population parameter(s) with known population proportion of an auxiliary variable. A class of estimators is defined which includes [1], [2] and [3] estimators. Under ... More
Ratio Estimators in Simple Random Sampling when Study Variable is an AttributeNov 03 2010In this paper we have suggested a family of estimators for the population mean when study variable itself is qualitative in nature. Expressions for the bias and mean square error (MSE) of the suggested family have been obtained. An empirical study has ... More
Some Improved Estimators In Systematic Sampling Under Non-responseMar 05 2014In this paper we have considered the problem of estimating the population mean in systematic sampling using information on an auxiliary variable in presence of non response. Some modified ratio, product and difference type estimators in systematic sampling ... More
Some improved estimators for estimating population mean in stratified random samplingSep 12 2013Some improved estimators are proposed for estimating the population mean in stratified sampling in the presence of auxiliary information. Mean square error (MSE) of the proposed estimators have been derived under large sample approximation. It has been ... More
Exponential Ratio Type Estimators In Stratified Random SamplingJan 22 2013Kadilar and Cingi (2003) have introduced a family of estimators using auxiliary information in stratified random sampling. In this paper, we propose the ratio estimator for the estimation of population mean in the stratified random sampling by using the ... More
A General Family of Estimators for Estimating Population Mean in Systematic Sampling Using Auxiliary Information in the Presence of Missing ObservationsMay 08 2013This paper proposes a general family of estimators for estimating the population mean in systematic sampling in the presence of non-response adapting the family of estimators proposed by Khoshnevisan et al. (2007). In this paper we have discussed the ... More
The Free Energy of Hot QED at Fifth OrderJun 15 1994The order $e^5$ contribution to the pressure of massless quantum electrodynamics at nonzero temperature is determined explicitly. An identity is also obtained relating a gauge-invariant piece of the pressure at order $e^{2n+3} \ (n \ge 1) $ (from diagrams ... More
Information-theoretic corrections to black hole area quantisation?Apr 24 2009Nonlinear corrections are proposed to the discrete equispaced area spectrum of quantum black holes obtained previously in some quantisation schemes. It is speculated that such a modified spectrum might be related to the fine structure found using the ... More
An Approximate Expression for the Large Angle Period of a Simple PendulumMar 10 2003A heuristic but pedagogical derivation is given of an explicit formula which accurately reproduces the period of a simple pendulum even for large amplitudes. The formula is compared with others in the literature.
Bounds On The Sum Of A Divergent SeriesOct 23 2000Given a truncated perturbation expansion of a physical quantity, one can, under certain circumstances, obtain lower or upper bounds (or both) to the sum of the full perturbation series by using the Borel transform and a variational conformal map. The ... More
Moduli of bundles on exotic del Pezzo ordersOct 01 2008Maximal orders of rank 4 on the projective plane, ramified on a smooth plane quartic are examples of exotic del Pezzo orders. We compute the possible Chern classes for line bundles on such orders and show the moduli space of line bundles with minimal ... More
M-Theory and Topological Strings--IIDec 15 1998It is shown how the topological string amplitudes encode the BPS structure of wrapped M2 branes in M-theory compactification on Calabi-Yau threefolds. This in turn is related to a twisted supersymmetric index in 5 dimensions which receives contribution ... More
Survival probability of a diffusing test particle in a system of coagulating and annihilating random walkersApr 01 2004We calculate the survival probability of a diffusing test particle in an environment of diffusing particles that undergo coagulation at rate lambda_c and annihilation at rate lambda_a. The test particle dies at rate lambda' on coming into contact with ... More
Decentralized sequential change detection using physical layer fusionJul 22 2007Aug 04 2008The problem of decentralized sequential detection with conditionally independent observations is studied. The sensors form a star topology with a central node called fusion center as the hub. The sensors make noisy observations of a parameter that changes ... More
The High Density Phase of the $k$-NN Hard Core Lattice Gas ModelApr 28 2016The $k$-NN hard core lattice gas model on a square lattice, in which the first $k$ next nearest neighbor sites of a particle are excluded from being occupied by another particle, is the lattice version of the hard disc model in two dimensional continuum. ... More
The effect of rare regions on a disordered itinerant quantum antiferromagnet with cubic anisotropyApr 03 2000We study the quantum phase transition of an itinerant antiferromagnet with cubic anisotropy in the presence of quenched disorder, paying particular attention to the locally ordered spatial regions that form in the Griffiths region. We derive an effective ... More
Asymptotic Behavior of the Isotropic-Nematic and Nematic-Columnar Phase Boundaries for the System of Hard Rectangles on a Square latticeSep 16 2014A system of hard rectangles of size $m\times mk$ on a square lattice undergoes three entropy driven phase transitions with increasing density for large enough aspect ratio $k$: first from a low density isotropic to an intermediate density nematic phase, ... More
Re-entrant Disordered Phase in a System of Repulsive Rods on a Bethe-like LatticeJun 06 2013We solve exactly a model of monodispersed rigid rods of length $k$ with repulsive interactions on the random locally tree like layered lattice. For $k\geq 4$ we show that with increasing density, the system undergoes two phase transitions: first from ... More
Long Tailed Maps as a Representation of Mixed Mode Oscillatory SystemsDec 27 2004Mixed mode oscillatory (MMO) systems are known to exhibit some generic features such as the reversal of period doubling sequences and crossover to period adding sequences as bifurcation parameters are varied. In addition, they exhibit a nearly one dimensional ... More
Mirror Symmetry via Deformation of Bundles on K3 SurfacesJun 01 1997Jul 05 1997We consider F-theory compactifications on a mirror pair of elliptic Calabi-Yau threefolds. This yields two different six-dimensional theories, each of them being nonperturbatively equivalent to some compactification of heterotic strings on a K3 surface ... More
Why is Schrodinger's Equation Linear?Dec 24 2004May 24 2005Information-theoretic arguments are used to obtain a link between the accurate linearity of Schrodinger's equation and Lorentz invariance: A possible violation of the latter at short distances would imply the appearance of nonlinear corrections to quantum ... More
The Free Energy Of Hot Gauge TheoriesOct 25 2000May 08 2001The total perturbative contribution to the free-energy of hot SU(3) gauge theory is argued to lie significantly higher than the full result obtained by lattice simulations. This then suggests the existence of large non-perturbative corrections even at ... More
Thermal Expansion PuzzlesJul 15 2005The standard formula that describes the thermal expansion of a solid creates several puzzles for discerning students. Three puzzles are reviewed, and their common resolution discussed both conceptually and quantitatively.
Borel Resummation of the Perturbative Free Energy of Hot Yang-Mills TheoryOct 20 2000Feb 25 2001The divergent perturbative expansion of the free-energy density of thermal SU(3) gauge theory is resummed into a rapidly convergent series using a novel, variational, implementation of the method of conformal mapping of the corresponding Borel series. ... More
Correlated Random MeasuresJul 02 2015Nov 09 2016We develop correlated random measures, random measures where the atom weights can exhibit a flexible pattern of dependence, and use them to develop powerful hierarchical Bayesian nonparametric models. Hierarchical Bayesian nonparametric models are usually ... More
Effect of spatial bias on the nonequilibrium phase transition in a system of coagulating and fragmenting particlesJun 07 2002We examine the effect of spatial bias on a nonequilibrium system in which masses on a lattice evolve through the elementary moves of diffusion, coagulation and fragmentation. When there is no preferred directionality in the motion of the masses, the model ... More
High Speed and Area Efficient 2D DWT Processor based Image Compression" Signal & Image ProcessingDec 31 2010This paper presents a high speed and area efficient DWT processor based design for Image Compression applications. In this proposed design, pipelined partially serial architecture has been used to enhance the speed along with optimal utilization and resources ... More
Free Fermions and Thermal AdS/CFTNov 01 2007Nov 10 2007The dynamics of finite temperature U(N) gauge theories on $S^3$ can be described, at weak coupling, by an effective unitary matrix model. Here we present an exact solution to these models, for any value of $N$, in terms of a sum over representations. ... More
On Euclidean and Noetherian Entropies in AdS SpaceApr 10 2006May 09 2006We examine the Euclidean action approach, as well as that of Wald, to the entropy of black holes in asymptotically $AdS$ spaces. From the point of view of holography these two approaches are somewhat complementary in spirit and it is not obvious why they ... More
The DJL Conjecture for CP Matrices over Special InclinesAug 31 2017Drew, Johnson and Loewy conjectured that for $n \geq 4$, the CP-rank of every $n \times n$ completely positive real matrix is at most $\left[n^{2}/4\right]$. While this conjecture is false for completely positive real matrices, we show that this conjecture ... More
Generalized estimators using characteristics of Poisson distributionFeb 09 2015In this article, we have proposed a generalized class of estimators, exponential class of estimators based on adaption of Sharma and Singh (2015) and Solanki and Singh (2013) and simple difference estimator for estimating unknown population mean in case ... More
Ratio Estimators in Simple Random Sampling Using Information on Auxiliary AttributeJul 23 2009Some ratio estimators for estimating the population mean of the variable under study, which make use of information regarding the population proportion possessing certain attribute, are proposed. Under simple random sampling without replacement (SRSWOR) ... More
Multivariate ratio estimation with known population proportion of two auxiliary characters for finite populationSep 19 2013In the present study, we propose estimators based on geometric and harmonic mean for estimating population mean using information on two auxiliary attributes in simple random sampling. We have shown that, when we have multi-auxiliary attributes, estimators ... More
Estimation of Mean in Presence of Non Response Using Exponential EstimatorJun 13 2009This paper considers the problem of estimating the population mean using information on auxiliary variable in presence of non response. Exponential ratio and exponential product type estimators have been suggested and their properties are studied. An ... More
A general family of dual to ratio-cum-product estimator in sample surveysOct 10 2012May 31 2013This paper presents a family of dual to ratio-cum-product estimators for the finite population mean. Under simple random sampling without replacement (SRSWOR) scheme, expressions of the bias and mean-squared error (MSE) up to the first order of approximation ... More
Flow-induced phase separation of active particles is controlled by boundary conditionsOct 27 2017Apr 29 2018Active particles, including swimming microorganisms, autophoretic colloids and droplets, are known to self-organize into ordered structures at fluid-solid boundaries. The entrainment of particles in the attractive parts of their spontaneous flows has ... More
Improved Exponential Estimator for Population Variance Using Two Auxiliary VariablesFeb 01 2009In this paper exponential ratio and exponential product type estimators using two auxiliary variables are proposed for estimating unknown population variance $S_y^2$. Problem is extended to the case of two-phase sampling. Theoretical results are supported ... More
Two-phase sampling in estimation of population mean in the presence of non-responseApr 08 2014The present paper presents the detail discussion on estimation of population mean in simple random sampling in the presence of non-response. Motivated by Gupta and Shabbir (2008), we have suggested the class of estimators of population mean using an auxiliary ... More
Spatial SINR Games of Base Station Placement and Mobile AssociationFeb 17 2011We study the question of determining locations of base stations that may belong to the same or to competing service providers. We take into account the impact of these decisions on the behavior of intelligent mobile terminals who can connect to the base ... More
Direct effect of solvent viscosity on the physical mass transfer for wavy film flow in a packed columnJun 19 2019The interphase mass transfer plays a critical role in determining the height of packed column used in absorption process. In a recent experiments2, the direct impact of viscosity on the physical mass transfer coefficient was observed to be higher in a ... More
Little Dragon Two: An efficient Multivariate Public Key CryptosystemMay 27 2010In 1998 [8], Patarin proposed an efficient cryptosystem called Little Dragon which was a variant a variant of Matsumoto Imai cryptosystem C*. However Patarin latter found that Little Dragon cryptosystem is not secure [8], [3]. In this paper we propose ... More