Results for "Maryam Shahi"

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Characterization and Characteristics of mechanochemically synthesized amorphous fast ionic conductor 50 SISOMO (50AgI-25Ag2O-25MoO3)Apr 07 2012Mechanochemically synthesized amorphous 50SISOMO [50AgI-25Ag_2O-25MoO_3] fast ionic conductor shows high ionic conductivity of ~ 6x10^-3 {\Omega}^-1 cm-1 at room temperature. The highest ionic conductivity is achieved for 36 h milled sample, which is ... More
On Sobolev spaces and density theorems on Finsler manifoldsOct 30 2013Let $(M,F)$ be a $C^\infty$ Finsler manifold, $p\geq 1$ a real number, $k$ a positive integer and $H_k^p (M)$ a certain Sobolev space determined by a Finsler structure $F$. Here, it is shown that the set of all real $C^{\infty}$ functions with compact ... More
Growth of Weil-Petersson volumes and random hyperbolic surfaces of large genusDec 10 2010In this paper we study the asymptotic behavior of Weil-Petersson volumes of moduli spaces of hyperbolic surfaces of genus $g$ as $g \rightarrow \infty.$ We apply these asymptotic estimates to study the geometric properties of random hyperbolic surfaces, ... More
Thermal Resistances of Thin-Films of Small Molecule Organic SemiconductorsJul 06 2016Sep 02 2016We have measured the thermal resistances of thin films of the small molecule organic semiconductors bis(triisopropylsilylethynyl) pentacene (TIPS-pn), bis(triethylsilylethynyl) anthradithiophene (TES-ADT) and difluoro bis(triethylsilylethynyl) anthradithiophene ... More
Zigzag-base Folded Sheet Cellular Mechanical MetamaterialsSep 27 2015The Japanese art of turning flat sheets into 3D intricate structures, origami, has inspired design of mechanical metamaterials. Mechanical metamaterials are artificially engineered materials with uncommon properties. Miura-ori is a remarkable origami ... More
Stellar Forensics with the Supernova-GRB ConnectionMay 26 2011Long-duration gamma-ray bursts (GRBs) and Type Ib/c Supernovae (SNe Ib/c) are amongst nature's most magnificent explosions. While GRBs launch relativistic jets, SNe Ib/c are core-collapse explosions whose progenitors have been stripped of their hydrogen ... More
A Novel Contourlet Domain Watermark Detector for Copyright ProtectionJan 22 2018Digital media can be distributed via Internet easily, so, media owners are eagerly seeking methods to protect their rights. A typical solution is digital watermarking for copyright protection. In this paper, we propose a novel contourlet domain image ... More
On the Capacity of the Slotted Strongly Asynchronous Channel with a Bursty UserJan 30 2017Jul 26 2018In this paper, the trade-off between the number of transmissions (or burstiness) $K_n=e^{n\nu}$ of a user, the asynchronism level $A_n=e^{n\alpha}$ in a slotted strongly asynchronous channel, and the ability to distinguish $M_n=e^{nR}$ messages per transmission ... More
Frequency-Dependent Photothermal Measurement of Transverse Thermal Diffusivity of Organic SemiconductorsAug 13 2015Nov 30 2015We have used a photothermal technique, in which chopped light heats the front surface of a small ( ~ 1 mm2) sample and the chopping frequency dependence of thermal radiation from the back surface is measured with a liquid nitrogen cooled infrared detector. ... More
Study of Glass and Bakelite properties as electrodes in RPCsApr 14 2016May 11 2016India-based Neutrino Observatory (INO) collaboration is planning to build a magnetized Iron-CALorimeter detector (ICAL) for the study of atmospheric neutrinos. ICAL detector will be a stack of 151 layers of magnetized iron plates interleaved with Resistive ... More
On the Capacity of the AWGN Channel with Additive Radar InterferenceJan 30 2017This paper investigates the capacity of a communications channel that, in addition to additive white Gaussian noise, also suffers from interference caused by a co-existing radar transmission. The radar interference (of short duty-cycle and of much wider ... More
Asymptotic Theory for M-Estimates in Unstable AR(p) Processes with Infinite Variance InnovationsJun 18 2015In this paper, we present the asymptotic distribution of M-estimators for parameters in non-stationary AR(p) processes. The innovations are assumed to be in the domain of attraction of a stable law with index $0<\alpha\le2$. In particular, when the model ... More
Non-commutative Dp-Brane in General Background FieldsAug 24 2013We investigate non-commutativity of open strings, attached to a D$p$-brane, in the presence of the linear dilaton, tachyon, U(1) gauge field as well as constant anti-symmetric $B$-field backgrounds. Non-commutativity parameter, open string metric and ... More
Multi shocks in Reaction-diffusion modelsOct 09 2006Mar 22 2007It is shown, concerning equivalent classes, that on a one-dimensional lattice with nearest neighbor interaction, there are only four independent models possessing double-shocks. Evolution of the width of the double-shocks in different models is investigated. ... More
Phase transitions in systems possessing Shock solutionsNov 21 2005Jun 11 2006Recently it is shown that there are three families of stochastic one-dimensional non-equilibrium lattice models for which the single-shock measures form an invariant subspace of the states of these models. Here, both the stationary states and dynamics ... More
Invariant and stationary measures for the SL(2,R) action on Moduli spaceFeb 14 2013Feb 05 2016We prove some ergodic-theoretic rigidity properties of the action of SL(2,R) on moduli space. In particular, we show that any ergodic measure invariant under the action of the upper triangular subgroup of SL(2,R) is supported on an invariant affine submanifold. ... More
Dissipative Preparation of Entangled Many-Body States with Rydberg AtomsNov 29 2016We investigate a one-dimensional atomic lattice laser-driven to a Rydberg state, in which engineered dissipation channels lead to entanglement in the many-body system. In particular, we demonstrate the efficient generation of ground states of a frustration-free ... More
Detection and Characterization of Extrasolar Planets through Mean-Motion Resonances: Simulations of Hypothetical Debris DisksJul 09 2015Mar 29 2016The gravitational influence of a planet on a nearby disk provides a powerful tool for detecting and studying extrasolar planetary systems. Here we demonstrate that gaps can be opened in dynamically cold debris disks at the mean-motion resonances of an ... More
Performance guarantees for greedy maximization of non-submodular controllability metricsDec 12 2017Nov 19 2018A key problem in emerging complex cyber-physical networks is the design of information and control topologies, including sensor and actuator selection and communication network design. These problems can be posed as combinatorial set function optimization ... More
Groups with few maximal sum-free setsNov 14 2018We show that, in contrast to the integers setting, almost all even order abelian groups $G$ have exponentially fewer maximal sum-free sets than $2^{\mu(G)/2}$, where $\mu(G)$ denotes the size of a largest sum-free set in $G$. This confirms a conjecture ... More
Minimizing Regret in Bandit Online Optimization in Unconstrained and Constrained Action SpacesJun 13 2018Aug 10 2018We consider online convex optimization with a zero-order oracle feedback. In particular, the decision maker does not know the explicit representation of the time-varying cost functions, or their gradients. At each time step, she observes the value of ... More
Payoff-Based Approach to Learning Nash Equilibria in Convex GamesNov 30 2016We consider multi-agent decision making, where each agent optimizes its cost function subject to constraints. Agents' actions belong to a compact convex Euclidean space and the agents' cost functions are coupled. We propose a distributed payoff-based ... More
Ramsey numbers of 3-uniform loose paths and loose cyclesNov 25 2012Haxell et. al. [%P. Haxell, T. Luczak, Y. Peng, V. R\"{o}dl, A. %Ruci\'{n}ski, M. Simonovits, J. Skokan, The Ramsey number for hypergraph cycles I, J. Combin. Theory, Ser. A, 113 (2006), 67-83] proved that the 2-color Ramsey number of 3-uniform loose ... More
The boundary of an affine invariant submanifoldAug 06 2015Sep 15 2015We study the boundary of an affine invariant submanifold of a stratum of translation surfaces in a partial compactification consisting of all finite area Abelian differentials over nodal Riemann surfaces, modulo zero area components. The main result is ... More
Hydrodynamical wind on vertically self-gravitating ADAFs in the presence of toroidal magnetic fieldNov 11 2015We present the effect of a hydrodynamical wind on the structure and the surface temperature of a vertically self-gravitating magnetized ADAFs using self-similar solutions. Also a model for an axisymmetric, steady-state, vertically self-gravitating hot ... More
Optimal size, freshness and time-frame for voice search vocabularyOct 31 2012In this paper, we investigate how to optimize the vocabulary for a voice search language model. The metric we optimize over is the out-of-vocabulary (OoV) rate since it is a strong indicator of user experience. In a departure from the usual way of measuring ... More
Strongly star forming galaxies in the local Universe with nebular He II 4686 emissionJan 05 2012Mar 22 2012We present a sample of 2865 emission line galaxies with strong nebular He II 4686 emissions in Sloan Digital Sky Survey Data Release 7 and use this sample to investigate the origin of this line in star-forming galaxies. We show that star-forming galaxies ... More
Tame Loci of Certain Local Cohomology ModulesJun 18 2011Let $M$ be a finitely generated graded module over a Noetherian homogeneous ring $R = \bigoplus_{n \in \mathbb{N}_0}R_n$. For each $i \in \mathbb{N}_0$ let $H^i_{R_{+}}(M)$ denote the $i$-th local cohomology module of $M$ with respect to the irrelevant ... More
Adiabatic Pumping of Chern-Simons Axion CouplingNov 06 2014We study the adiabatic pumping of the Chern-Simons axion (CSA) coupling along a parametric loop characterized by a non-zero second Chern number $C^{(2)}$ from the viewpoint of the hybrid Wannier representation, in which the Wannier charge centers (WCCs) ... More
$λφ^{4}$ Kink and sine-Gordon Soliton in the GUP FrameworkFeb 16 2014Mar 04 2014We consider $\lambda\phi^{4}$ kink and sine-Gordon soliton in the presence of a minimal length uncertainty proportional to the Planck length. The modified Hamiltonian contains an extra term proportional to $p^4$ and the generalized Schr\"odinger equation ... More
Partially magic labelings and the Antimagic Graph ConjectureNov 13 2015The Antimagic Graph Conjecture asserts that every connected graph $G = (V, E)$ except $K_2$ admits an edge labeling such that each label $1, 2, \dots, |E|$ is used exactly once and the sums of the labels on all edges incident to a given vertex are distinct. ... More
Mass-like gap creation by mixed singlet and triplet state in superconducting topological insulatorMar 04 2019Mar 09 2019We investigate proximity-induced mixed spin-singlet and spin-triplet superconducting state on the surface states of a topological insulator. Such hybrid structure features fundamentally distinct electron-hole excitations and resulting effective superconducting ... More
Exploiting Weak Supermodularity for Coalition-Proof MechanismsMar 29 2018Nov 23 2018Under the incentive-compatible Vickrey-Clarke-Groves mechanism, coalitions of participants can influence the auction outcome to obtain higher collective profit. These manipulations were proven to be eliminated if and only if the market objective is supermodular. ... More
Glassy nature of hierarchical organizationsJan 24 2017Jan 26 2017The question of why and how animal and human groups form temporarily stable hierarchical organizations has long been a great challenge from the point of quantitative interpretations. The prevailing observation/consensus is that a hierarchical social or ... More
Asymptotic Theory for M-Estimates in Unstable AR(p) Processes with Infinite Variance InnovationsJun 18 2015Dec 12 2016In this paper, we present the asymptotic distribution of M-estimators for parameters in non-stationary AR(p) processes. The innovations are assumed to be in the domain of attraction of a stable law with index $0<\alpha\le2$. In particular, when the model ... More
Unsupervised Hypergraph Feature Selection via a Novel Point-Weighting Framework and Low-Rank RepresentationAug 25 2018Oct 03 2018Feature selection methods are widely used in order to solve the 'curse of dimensionality' problem. Many proposed feature selection frameworks, treat all data points equally; neglecting their different representation power and importance. In this paper, ... More
Computational study of geometric effects of bottom wall microgrooves on cell docking inside microfluidic devicesAug 30 2018Cells docking inside microfluidic devices is effective in studying cell biology, cell-based biosensing as well as drug screening. Moreover, single cell and regularly cells docking inside microstructure of the microfluidics system are advantageous in different ... More
Bootstrapping the Mean Vector for the Observations in the Domain of Attraction of a Multivariate Stable LawOct 07 2015We consider a robust estimation of the mean vector for a sequence of i.i.d. observations in the domain of attraction of a stable law with different indices of stability, $DS(\alpha_1, \ldots, \alpha_p)$, such that $1<\alpha_{i}\leq 2$, $i=1,\ldots,p$. ... More
Museum Automation with RFIDOct 02 2014By increase of culture and knowledge of the people, request for visiting museums has increased and made the management of these places more complex. Valuable things in a museum or ancient place must be maintained well and also it need to managing visitors. ... More
Sense of Community: How Important is this Quality in Blended CoursesApr 01 2015Combining online classes with the traditional classes foster the advantages of both learning environments.The aim of this study was to examine the effects of integrating face to face classes in fully online courses.Forty eight undergraduate students studying ... More
SuperNova IDentification spectral templates of 70 stripped-envelope core-collapse supernovaeMay 06 2014Mar 31 2015We constructed 70 SuperNova IDentification (SNID; Blondin & Tonry 2007) supernova (SN) templates using 640 spectra of stripped-envelope core-collapse SNe (SESNe) published by Modjaz et al. (2014). Fifty-six SN templates which are constructed from 458 ... More
An Agent-based Model of the Cognitive Mechanisms Underlying the Origins of Creative Cultural EvolutionOct 14 2013Human culture is uniquely cumulative and open-ended. Using a computational model of cultural evolution in which neural network based agents evolve ideas for actions through invention and imitation, we tested the hypothesis that this is due to the capacity ... More
On total dominating sets in graphsOct 26 2008A set $S$ of vertices in a graph $G(V,E)$ is called a dominating set if every vertex $v\in V$ is either an element of $S$ or is adjacent to an element of $S$. A set $S$ of vertices in a graph $G(V,E)$ is called a total dominating set if every vertex $v\in ... More
Full rank affine invariant submanifoldsAug 06 2016We show that every GL(2, R) orbit closure of translation surfaces is either a connected component of a stratum, the hyperelliptic locus, or consists entirely of surfaces whose Jacobians have extra endomorphisms. We use this result to give applications ... More
Towards large genus asymtotics of intersection numbers on moduli spaces of curvesDec 06 2011We explicitly compute the diverging factor in the large genus asymptotics of the Weil-Petersson volumes of the moduli spaces of $n$-pointed complex algebraic curves. Modulo a universal multiplicative constant we prove the existence of a complete asymptotic ... More
On refined operator version of Young inequality and its reverseMay 09 2016In this note, some refinements of Young inequality and its reverse for positive numbers are proved and using these inequalities some operator versions and Hilbert-Schmidt norm versions for matrices of these inequalities are obtained.
On infinite dimensional linear programming approach to stochastic controlNov 30 2016Oct 15 2018We consider the infinite dimensional linear programming (inf-LP) approach for solving stochastic control problems. The inf-LP corresponding to problems with uncountable state and input spaces is in general computationally intractable. By focusing on linear ... More
Navier-Stokes equations on Riemannian manifoldsDec 21 2018We study properties of the solutions to Navier-Stokes system on compact Riemannian manifolds. The motivation for such a formulation comes from atmospheric models as well as some thin film flows on curved surfaces. There are different choices of the diffusion ... More
Ramsey numbers of $4$-uniform loose cyclesMar 05 2016Jun 12 2016Gy\'arf\'as, S\'ark\"ozy and Szemer\'edi proved that the $2$-color Ramsey number $R(\mathcal{C}^k_n,\mathcal{C}^k_n)$ of a $k$-uniform loose cycle $\mathcal{C}^k_n$ is asymptotically $\frac{1}{2}(2k-1)n,$ generating the same result for $k=3$ due to Haxell ... More
Diagonal Ramsey numbers of loose cycles in uniform hypergraphsMar 03 2015A $k$-uniform loose cycle $\mathcal{C}_n^k$ is a hypergraph with vertex set $\{v_1,v_2,\ldots,v_{n(k-1)}\}$ and with the set of $n$ edges $e_i=\{v_{(i-1)(k-1)+1},v_{(i-1)(k-1)+2},\ldots,v_{(i-1)(k-1)+k}\}$, $1\leq i\leq n$, where we use mod $n(k-1)$ arithmetic. ... More
Linkage of ideals over a moduleSep 11 2017Oct 15 2018Inspired by the works in linkage theory of ideals, we define the concept of linkage of ideals over a module. Several known theorems in linkage theory are improved or recovered by new approaches. Specially, we make some extensions and generalizations of ... More
Cohomological dimension with respect to the linked idealsJun 09 2018Let $R$ be a commutative Noetherian ring and $M$ be a finitely generated $R$-module. Considering the new concept of linkage of ideals over a module, we study the cohomological dimension of $M$ with respect to the linked ideals over it.
Using Uncertainty Data in Chance-Constrained Trajectory PlanningApr 29 2019We consider the problem of trajectory planning in an environment comprised of a set of obstacles with uncertain locations. While previous approaches model the uncertainties with a prescribed Gaussian distribution, we consider the realistic case in which ... More
Worst Case Competitive Analysis of Online Algorithms for Conic OptimizationNov 02 2016Online optimization covers problems such as online resource allocation, online bipartite matching, adwords (a central problem in e-commerce and advertising), and adwords with separable concave returns. We analyze the worst case competitive ratio of two ... More
Theoretical investigation of charge transport in germanium doped phosphorene nanoribons using DFT + NEGFJan 07 2018New two diemensional structures nanoribbon including phosphorus and germanium atoms are introduced for the nanoelectronic applications. Under various bias voltages, the electronic transport in the systems have been studied within the noneqilibrium Green's ... More
Graph Operations and Neighborhood PolynomialsJul 11 2018The neighborhood polynomial of graph $G$ is the generating function for the number of vertex subsets of $G$ of which the vertices have a common neighbor in $G$. In this paper, we investigate the behavior of this polynomial under several graph operations. ... More
Invariant and stationary measures for the SL(2,R) action on Moduli spaceFeb 14 2013Feb 05 2018We prove some ergodic-theoretic rigidity properties of the action of SL(2,R) on moduli space. In particular, we show that any ergodic measure invariant under the action of the upper triangular subgroup of SL(2,R) is supported on an invariant affine submanifold. ... More
Counting closed geodesics in Moduli spaceNov 14 2008Mar 19 2011We compute the asymptotics, as R tends to infinity, of the number of closed geodesics in Moduli space of length at most R, or equivalently the number of pseudo-Anosov elements of the mapping class group of translation length at most R.
Characterization of some special rings via linkageMar 07 2018Some descriptions of linked ideals in a commutative Notherian ring $R$ are provided in terms of the Associated prime ideals of $R$. Then, among other things, we make some characterization of Cohen-Macaulay, Gorenstein and regular local rings in terms ... More
The Statefinder hierarchy: An extended null diagnostic for concordance cosmologyJan 18 2011We show how higher derivatives of the expansion factor can be developed into a null diagnostic for concordance cosmology (LCDM). It is well known that the Statefinder -- the third derivative of the expansion factor written in dimensionless form, a^{(3)}/aH^3, ... More
Forecasting the Colorado River Discharge Using an Artificial Neural Network (ANN) ApproachNov 27 2014Artificial Neural Network (ANN) based model is a computational approach commonly used for modeling the complex relationships between input and output parameters. Prediction of the flow rate of a river is a requisite for any successful water resource management ... More
On improvement of Young inequality using the Kontrovich constantMay 09 2016Some improvements of Young inequality and its reverse for positive numbers with Kontrovich constant are given. Using these inequalities some operator versions and Hilbert-Schmidt norm versions for matrices are proved.
The Effect of Large Scale Magnetic Field on Outflow in ADAFs: an Odd Symmetry ConfigurationNov 11 2015We construct self-similar inflow-outflow solutions for a hot viscous-resistive accretion flow with large scale magnetic fields that have odd symmetry with respect to the equatorial plane in $B_\theta$, and even symmetry in $B_r$ and $B_\phi$. Following ... More
The boundary of an affine invariant submanifoldAug 06 2015Nov 02 2016We study the boundary of an affine invariant submanifold of a stratum of translation surfaces in a partial compactification consisting of all finite area Abelian differentials over nodal Riemann surfaces, modulo zero area components. The main result is ... More
Computational approach to quantum encoder design for purity optimizationJun 13 2006Jul 27 2007In this paper, we address the problem of designing a quantum encoder that maximizes the minimum output purity of a given decohering channel, where the minimum is taken over all possible pure inputs. This problem is cast as a max-min optimization problem ... More
Blended Learning or E-learning?Jun 18 2013ICT or Information and Communication Technology has pervaded the fields of education.In recent years the term e-learning has emerged as a result of the integration of ICT in the education fields. Following the application this technology into teaching, ... More
On infinite dimensional linear programming approach to stochastic controlNov 30 2016We consider the infinite dimensional linear programming (inf-LP) approach for solving stochastic control problems. The inf-LP corresponding to problems with uncountable state and input spaces is in general computationally intractable. By focusing on linear ... More
Navier-Stokes equations on Riemannian manifoldsDec 21 2018Mar 05 2019We study properties of the solutions to Navier-Stokes system on compact Riemannian manifolds. The motivation for such a formulation comes from atmospheric models as well as some thin film flows on curved surfaces. There are different choices of the diffusion ... More
Analysis of Novel Annotations in the Gene Ontology for Boosting the Selection of Negative ExamplesMay 23 2018Public repositories for genome and proteome annotations, such as the Gene Ontology (GO), rarely stores negative annotations, i.e. proteins not possessing a given function. This leaves undefined or ill defined the set of negative examples, which is crucial ... More
Mass-like gap creation by mixed singlet and triplet state in superconducting topological insulatorMar 04 2019We investigate proximity-induced mixed spin-singlet and spin-triplet superconducting state on the surface states of a topological insulator. Such hybrid structure features fundamentally distinct electron-hole excitations and resulting effective superconducting ... More
Transport properties of spin-triplet superconducting monolayer $MoS_2$Mar 07 2016The quantum transport properties of graphene and monolayer $MoS_2$ superconductor heterostructures has been of considerable importance in the recent few years. Layered nature of molybdenum disulfide permits the superconducting correlation induction. Moreover, ... More
Learning Nash Equilibria in Monotone GamesApr 03 2019We consider multi-agent decision making where each agent's cost function depends on all agents' strategies. We propose a distributed algorithm to learn a Nash equilibrium, whereby each agent uses only obtained values of her cost function at each joint ... More
Learning Generalized Nash Equilibria in a Class of Convex GamesMar 12 2017Oct 15 2018We consider multi-agent decision making where each agent optimizes its convex cost function subject to individual and coupling constraints. The constraint sets are compact convex subsets of a Euclidean space. To learn Nash equilibria, we propose a novel ... More
Dynamics of dissipative multiple exciton generation in nanocrystalsJan 18 2013The population dynamics of single- and bi-exciton states in semiconductor nanocrystals is modeled numerically in the presence of Coulomb coupling between single- and two-exciton states and a dissipation channel in order to study the transient bi-exciton ... More
Canonical modules of complexesMar 01 2016We define the notion of the canonical module of a complex. We then consider Serre's conditions for a complex and study their relationship to the local cohomology of the canonical module and its ring of endomorphisms.
Random Distances Associated with TrapezoidsMay 10 2013The distributions of the random distances associated with hexagons, rhombuses and triangles have been derived and verified in the existing work. All of these geometric shapes are related to each other and have various applications in wireless communications, ... More
On the Fractional Derivatives of Radial Basis FunctionsDec 22 2016The paper provides the fractional integrals and derivatives of the Rie\-mann-Liouville and Caputo type for the five kinds of radial basis functions (RBFs), including the powers, Gaussian, multiquadric, Matern and thin-plate splines, in one dimension. ... More
Relative Cohen-Macaulayness and relative unmixedness of bigraded modulesMay 16 2011In this paper we study the finitely generated bigraded modules over a standard bigraded polynomial ring which are relative Cohen-Macaulay or relative unmixed with respect to one of the irrelevant bigraded ideals. A generalization of Reisner's criterion ... More
On a fixed point in the metric space of normalized Hausdorff moment sequencesMar 19 2010We show that the transformation (x_n)_{n\ge 1}\to (1/(1+x_1+...+x_n))_{n\ge 1} of the compact set of sequences (x_n)_{n\ge 1} of numbers from the unit interval [0,1] has a unique fixed point, which is attractive. The fixed point turns out to be a Hausdorff ... More
Enumerations, Forbidden Subgraph Characterizations, and the Split-DecompositionAug 04 2016Forbidden characterizations may sometimes be the most natural way to describe families of graphs, and yet these characterizations are usually very hard to exploit for enumerative purposes. By building on the work of Gioan and Paul (2012) and Chauve et ... More
Sperner's colorings and optimal partitioning of the simplexNov 25 2016We discuss coloring and partitioning questions related to Sperner's Lemma, originally motivated by an application in hardness of approximation. Informally, we call a partitioning of the $(k-1)$-dimensional simplex into $k$ parts, or a labeling of a lattice ... More
Predicting a Business Star in Yelp from Its Reviews Text AloneJan 05 2014Yelp online reviews are invaluable source of information for users to choose where to visit or what to eat among numerous available options. But due to overwhelming number of reviews, it is almost impossible for users to go through all reviews and find ... More
A Note on Bootstrapping M-estimates from Unstable AR(2) Process with Infinite Variance InnovationsMar 08 2016The limiting distribution for M-estimates in a non-stationary autoregressive model with heavy-tailed error is computationally intractable. To make inferences based on the M-estimates, the bootstrap procedure can be used to approximate the sampling distribution. ... More
Ramsey numbers of uniform loose paths and cyclesFeb 17 2016Recently, determining the Ramsey numbers of loose paths and cycles in uniform hypergraphs has received considerable attention. It has been shown that the $2$-color Ramsey number of a $k$-uniform loose cycle $\mathcal{C}^k_n$, $R(\mathcal{C}^k_n,\mathcal{C}^k_n)$, ... More
Lifshitz Formula Using Box Renormalization (In Persian)Jun 05 2018In this paper the Lifshitz formula for the Casimir energy between two dielectrics in zero temperature is derived using box renormalization. Although there are several derivations for the force in this case in the literature, including Lifshitz's own proof, ... More
Decomposable Norm Minimization with Proximal-Gradient Homotopy AlgorithmJan 27 2015Sep 27 2016We study the convergence rate of the proximal-gradient homotopy algorithm applied to norm-regularized linear least squares problems, for a general class of norms. The homotopy algorithm reduces the regularization parameter in a series of steps, and uses ... More
Inter-band Coulomb coupling in narrow gap semiconductor nanocrystals: $\mathbf{k}\cdot\mathbf{p}$ theoryOct 18 2014May 01 2015We derive the matrix elements of Coulomb interaction between states with different number of electrons and holes in a semiconductor nanocrystal within the 8-band $\mathbf{k}\cdot\mathbf{p}$ theory. These matrix elements are responsible for multiple exciton ... More
Thermal diffusivity of PMMA/Alumina Nano Composites Using Molecular Dynamic SimulationOct 04 2017Fire protection mainly takes place through physical or chemical pathways or both of them. The thermal diffusivity is one of the basic thermophysical properties which can connect the chemical structure. It is well-known in the literature that there exist ... More
Outage-Optimized Deployment of UAVsApr 15 2019We consider multiple unmanned aerial vehicles (UAVs) serving a density of ground terminals (GTs) as mobile base stations. The objective is to minimize the outage probability of GT-to-UAV transmissions. In this context, the optimal placement of UAVs under ... More
Optimal design of dilution experiments under volume constraintsDec 13 2012May 07 2013The paper develops methods to construct a one-stage optimal design of dilution experiments under the total available volume constraint typical for bio-medical applications. We consider various design criteria based on the Fisher information both is Bayesian ... More
Cosmological Models of Universe with Variable Deceleration Parameter in Lyra's ManifoldAug 14 2006Nov 14 2006FRW models of the universe have been studied in the cosmological theory based on Lyra's manifold. A new class of exact solutions has been obtained by considering a time dependent displacement field for variable deceleration parameter from which three ... More
Origin of the size-dependence of the equilibrium van der Waals binding between nanostructuresFeb 03 2018Nanostructures can be bound together at equilibrium by the van der Waals (vdW) effect, a small but ubiquitous many-body attraction that presents challenges to density functional theory. How does the binding energy depend upon the size or number of atoms ... More
LRS Bianchi Type-V Viscous Fluid Universe With a Time Dependent Cosmological Term $Λ$Apr 06 2007Aug 06 2007An LRS Bianchi type-V cosmological models representing a viscous fluid distribution with a time dependent cosmological term $\Lambda$ is investigated. To get a determinate solution, the viscosity coefficient of bulk viscous fluid is assumed to be a power ... More
Case study: Data Mining of Associate Degree Accepted Candidates by Modular MethodApr 16 2014Since about 10 years ago, University of Applied Science and Technology (UAST) in Iran has admitted students in discontinuous associate degree by modular method, so that almost 100,000 students are accepted every year. Although the first aim of holding ... More
A Paradigm for the Application of Cloud Computing in Mobile Intelligent Tutoring SystemsApr 15 2013Nowadays, with the rapid growth of cloud computing, many industries are going to move their computing activities to clouds. Researchers of virtual learning are also looking for the ways to use clouds through mobile platforms. This paper offers a model ... More
A Model for an Intelligent and Adaptive Tutor based on Web by Jackson's Learning Styles Profiler and Expert SystemsApr 15 2013Todays, Intelligent and web-based E-Learning is one of the important area in E-Learning. This paper integrates an intelligent and web-based E-Learning with expert system technology to be able to model the learning styles of the learners using Jackson's ... More
Making sessile drops easierApr 22 2013May 16 2013Using an identity, directly derived from the Young-Laplace equation, the problem of the equilibrium shape of an axisymmetric sessile drop is reduced to a one-parameter shooting method problem. Based on the method the numerical solutions for drops with ... More
A Secure Communication in Mobile Agent SystemFeb 04 2014A mobile agent is a software code with mobility which can be move from a computer into another computers through network. The mobile agent paradigm provides many benefits in developments of distributed application at the same time introduce new requirements ... More
High Quality Degree Based Heuristics for the Influence Maximization ProblemApr 27 2019The problem of influence maximization is to select the most influential individuals in a social network. With the popularity of social network sites, and the development of viral marketing, the importance of the problem has been increased. The influence ... More
Collective Dynamics of Interacting Particles in Unsteady FlowsAug 04 2014We use the Fokker-Planck equation and its moment equations to study the collective behavior of interacting particles in unsteady one-dimensional flows. Particles interact according to a long-range attractive and a short-range repulsive potential field ... More