Results for "Shahin Kamali"

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Online Bin Covering with AdviceApr 30 2019The bin covering problem asks for covering a maximum number of bins with an online sequence of $n$ items of different sizes in the range $(0,1]$; a bin is said to be covered if it receives items of total size at least 1. We study this problem in the advice ... More
Approximation Algorithms for Graph BurningNov 11 2018Numerous approaches study the vulnerability of networks against social contagion. Graph burning studies how fast a contagion, modeled as a set of fires, spreads in a graph. The burning process takes place in synchronous, discrete rounds. In each round, ... More
An All-Around Near-Optimal Solution for the Classic Bin Packing ProblemApr 17 2014In this paper we present the first algorithm with optimal average-case and close-to-best known worst-case performance for the classic on-line problem of bin packing. It has long been observed that known bin packing algorithms with optimal average-case ... More
Efficient Online Strategies for Renting Servers in the CloudAug 18 2014In Cloud systems, we often deal with jobs that arrive and depart in an online manner. Upon its arrival, a job should be assigned to a server. Each job has a size which defines the amount of resources that it needs. Servers have uniform capacity and, at ... More
On Advice Complexity of the k-server Problem under Sparse MetricsMay 09 2013We consider the k-server problem under the advice model of computation when the underlying metric space is sparse. On one side, we show that an advice of size {\Omega}(n) is required to obtain a 1-competitive algorithm for sequences of size n, even for ... More
New physics in inclusive semileptonic $B$ decays including nonperturbative correctionsNov 18 2018Feb 01 2019In this work we study the effects of New Physics (NP) operators on the inclusive $\bar{B} \to X_c \tau^- \bar{\nu}_\tau$ decay including power $(\mathcal{O}(1/m_b^2))$ corrections in the NP operators. In analogy with $R(D^{(*)})$ observables, we study ... More
Online Bin Packing with AdviceDec 17 2012Dec 21 2013We consider the online bin packing problem under the advice complexity model where the 'online constraint' is relaxed and an algorithm receives partial information about the future requests. We provide tight upper and lower bounds for the amount of advice ... More
On the List Update Problem with AdviceNov 28 2013Jun 03 2016We study the online list update problem under the advice model of computation. Under this model, an online algorithm receives partial information about the unknown parts of the input in the form of some bits of advice generated by a benevolent offline ... More
Online Computation with Untrusted AdviceMay 14 2019The advice model of online computation captures the setting in which the online algorithm is given some partial information concerning the request sequence. This paradigm allows to establish tradeoffs between the amount of this additional information ... More
Electromagnetic interaction vertex of $Δ$ baryons in hard-wall AdS/QCD modelMar 19 2011Jul 21 2011We consider an interaction of a spin-3/2 field with the electromagnetic field in the framework of the hard-wall model of AdS/QCD. We write Lagrangian for this interaction including all kinds interaction terms in the bulk of AdS$_{5}$ space and present ... More
Speaker Identification in each of the Neutral and Shouted Talking Environments based on Gender-Dependent Approach Using SPHMMsJun 29 2017It is well known that speaker identification performs extremely well in the neutral talking environments; however, the identification performance is declined sharply in the shouted talking environments. This work aims at proposing, implementing and testing ... More
Gender-dependent emotion recognition based on HMMs and SPHMMsJan 20 2018It is well known that emotion recognition performance is not ideal. The work of this research is devoted to improving emotion recognition performance by employing a two-stage recognizer that combines and integrates gender recognizer and emotion recognizer ... More
Warm (Pseudo)Scalar InflationJan 07 2019In this note, we will introduce an action for warm inflation model with direct coupling between the pseudoscalar field and mass-less $SU(2)$ gauge fields. The potential of inflaton is protected against the thermal corrections in a thermal bath of gauge ... More
Reheating After Swampland ConjectureFeb 02 2019Swampland conjecture is in contrast with effective thermal field theory of reheating epoch. The effective potential of the scalar field, which is firstly responsible for the accelerated expansion of the universe, at the reheating epoch with temperature ... More
Speaker Verification in Emotional Talking Environments based on Three-Stage FrameworkMar 31 2018This work is dedicated to introducing, executing, and assessing a three-stage speaker verification framework to enhance the degraded speaker verification performance in emotional talking environments. Our framework is comprised of three cascaded stages: ... More
Identifying Speakers Using Their Emotion CuesJan 22 2018This paper addresses the formulation of a new speaker identification approach which employs knowledge of emotional content of speaker information. Our proposed approach in this work is based on a two-stage recognizer that combines and integrates both ... More
Speaker Identification in the Shouted Environment Using Suprasegmental Hidden Markov ModelsJun 29 2017In this paper, Suprasegmental Hidden Markov Models (SPHMMs) have been used to enhance the recognition performance of text-dependent speaker identification in the shouted environment. Our speech database consists of two databases: our collected database ... More
Studying and Enhancing Talking Condition Recognition in Stressful and Emotional Talking Environments Based on HMMs, CHMM2s and SPHMMsJul 01 2017The work of this research is devoted to studying and enhancing talking condition recognition in stressful and emotional talking environments (completely two separate environments) based on three different and separate classifiers. The three classifiers ... More
Employing both Gender and Emotion Cues to Enhance Speaker Identification Performance in Emotional Talking EnvironmentsJun 29 2017Speaker recognition performance in emotional talking environments is not as high as it is in neutral talking environments. This work focuses on proposing, implementing, and evaluating a new approach to enhance the performance in emotional talking environments. ... More
Enhancing speaker identification performance under the shouted talking condition using second-order circular hidden Markov modelsJun 29 2017It is known that the performance of speaker identification systems is high under the neutral talking condition; however, the performance deteriorates under the shouted talking condition. In this paper, second-order circular hidden Markov models (CHMM2s) ... More
Meson effective mass in the isospin medium in hard-wall AdS/QCD modelApr 22 2015Feb 20 2016We study a mass splitting of light vector, axial-vector and pseudoscalar mesons in isospin medium in the framework of hard-wall model. We write an effective mass definition for the interacting gauge fields and scalar field introduced in gauge field theory ... More
Employing Emotion Cues to Verify Speakers in Emotional Talking EnvironmentsJul 01 2017Usually, people talk neutrally in environments where there are no abnormal talking conditions such as stress and emotion. Other emotional conditions that might affect people talking tone like happiness, anger, and sadness. Such emotions are directly affected ... More
Speaker Identification Investigation and Analysis in Unbiased and Biased Emotional Talking EnvironmentsJun 29 2017This work aims at investigating and analyzing speaker identification in each unbiased and biased emotional talking environments based on a classifier called Suprasegmental Hidden Markov Models (SPHMMs). The first talking environment is unbiased towards ... More
Using Second-Order Hidden Markov Model to Improve Speaker Identification Recognition Performance under Neutral ConditionJun 29 2017In this paper, second-order hidden Markov model (HMM2) has been used and implemented to improve the recognition performance of text-dependent speaker identification systems under neutral talking condition. Our results show that HMM2 improves the recognition ... More
Speaker Identification in a Shouted Talking Environment Based on Novel Third-Order Circular Suprasegmental Hidden Markov ModelsJul 02 2017It is well known that speaker identification yields very high performance in a neutral talking environment, on the other hand, the performance has been sharply declined in a shouted talking environment. This work aims at proposing, implementing, and evaluating ... More
Emirati Speaker Verification Based on HMM1s, HMM2s, and HMM3sJul 02 2017This work focuses on Emirati speaker verification systems in neutral talking environments based on each of First-Order Hidden Markov Models (HMM1s), Second-Order Hidden Markov Models (HMM2s), and Third-Order Hidden Markov Models (HMM3s) as classifiers. ... More
Talking Condition Identification Using Second-Order Hidden Markov ModelsJul 01 2017This work focuses on enhancing the performance of text-dependent and speaker-dependent talking condition identification systems using second-order hidden Markov models (HMM2s). Our results show that the talking condition identification performance based ... More
Speaking Style Authentication Using Suprasegmental Hidden Markov ModelsJun 29 2017The importance of speaking style authentication from human speech is gaining an increasing attention and concern from the engineering community. The importance comes from the demand to enhance both the naturalness and efficiency of spoken language human-machine ... More
Employing Second-Order Circular Suprasegmental Hidden Markov Models to Enhance Speaker Identification Performance in Shouted Talking EnvironmentsJun 29 2017Speaker identification performance is almost perfect in neutral talking environments; however, the performance is deteriorated significantly in shouted talking environments. This work is devoted to proposing, implementing and evaluating new models called ... More
Photoelectric Observations, Light Curves Analysis and Period Study of the Eclipsing Variable DO CasOct 20 2006The new B and V photoelectric observations of the beta Lyrae eclipsing binary DO Cas were obtained on 6 nights form December 2000 to January 2001. The observations were made at the Biruni Observatory, Shiraz, Iran and the light curves are analyzed using ... More
Emotion Recognition based on Third-Order Circular Suprasegmental Hidden Markov ModelMar 23 2019This work focuses on recognizing the unknown emotion based on the Third-Order Circular Suprasegmental Hidden Markov Model (CSPHMM3) as a classifier. Our work has been tested on Emotional Prosody Speech and Transcripts (EPST) database. The extracted features ... More
Speaker Identification in Shouted Talking Environments Based on Novel Third-Order Hidden Markov ModelsJul 01 2017In this work we propose, implement, and evaluate novel models called Third-Order Hidden Markov Models (HMM3s) to enhance low performance of text-independent speaker identification in shouted talking environments. The proposed models have been tested on ... More
Prime Labeling of LaddersOct 27 2016A prime labeling of a graph with $n$ vertices is a labeling of its vertices with distinct integers from $\{1, 2,\ldots , n\}$ in such a way that the labels of any two adjacent vertices are relatively prime. T. Varkey conjectured that ladder graphs have ... More
Tachyon-Warm Intermediate and Logamediate Inflation in the Brane-World Model in the Light of Planck DataAug 22 2015Sep 17 2016Tachyon inflationary universe model on the brane in the context of warm inflation is studied. In slow-roll approximation and in longitudinal gauge, we find the primoradial perturbation spectrums for this scenario. We also present the general expressions ... More
Memetic Elitist Pareto Evolutionary Algorithm for Virtual Network EmbeddingApr 26 2015Apr 29 2015Assigning virtual network resources to physical network components, called Virtual Network Embedding, is a major challenge in cloud computing platforms. In this paper, we propose a memetic elitist pareto evolutionary algorithm for virtual network embedding ... More
Variability Modeling for Customizable SaaS ApplicationsSep 07 2014Most of current Software-as-a-Service (SaaS) applications are developed as customizable service-oriented applications that serve a large number of tenants (users) by one application instance. The current rapid evolution of SaaS applications increases ... More
Multi-Dimensional Customization Modelling Based On Metagraph For Saas Multi-Tenant ApplicationsFeb 25 2014Software as a Service (SaaS) is a new software delivery model in which pre-built applications are delivered to customers as a service. SaaS providers aim to attract a large number of tenants (users) with minimal system modifications to meet economics ... More
Logarithmic correlators or responses in non-relativistic analogues of conformal invarianceFeb 28 2013Recent developments on emergence of logarithmic terms in correlators or response functions of models which exhibit dynamical symmetries analogous to conformal invariance in not necessarily relativistic systems are reviewed. The main examples of these ... More
Finite-time Guarantees for Byzantine-Resilient Distributed State Estimation with Noisy MeasurementsOct 16 2018This work considers resilient, cooperative state estimation in unreliable multi-agent networks. A network of agents aims to collaboratively estimate the value of an unknown vector parameter, while an {\em unknown} subset of agents suffer Byzantine faults. ... More
Prime Labeling of LaddersOct 27 2016Feb 05 2019A prime labeling of a graph with $n$ vertices is a labeling of its vertices with distinct integers from $\{1, 2,\ldots , n\}$ in such a way that the labels of any two adjacent vertices are relatively prime. T. Varkey conjectured that ladder graphs have ... More
Exponentially Fast Parameter Estimation in Networks Using Distributed Dual AveragingSep 10 2013In this paper we present an optimization-based view of distributed parameter estimation and observational social learning in networks. Agents receive a sequence of random, independent and identically distributed (i.i.d.) signals, each of which individually ... More
Distributed Online Optimization in Dynamic Environments Using Mirror DescentSep 09 2016This work addresses decentralized online optimization in non-stationary environments. A network of agents aim to track the minimizer of a global time-varying convex function. The minimizer evolves according to a known dynamics corrupted by an unknown, ... More
Memetic Multi-Objective Particle Swarm Optimization-Based Energy-Aware Virtual Network EmbeddingApr 26 2015In cloud infrastructure, accommodating multiple virtual networks on a single physical network reduces power consumed by physical resources and minimizes cost of operating cloud data centers. However, mapping multiple virtual network resources to physical ... More
Polymorphic Worms Collection in Cloud ComputingSep 05 2014Sep 13 2014In the past few years, computer worms are seen as one of significant challenges of cloud computing. Worms are rapidly changing and getting more sophisticated to evade detection. One major issue to defend against computer worms is collecting worms' payloads ... More
Fractional Galilean SymmetriesMar 13 2016Jul 31 2016We generalize the differential representation of the operators of the Galilean algebras to include fractional derivatives. As a result a whole new class of scale invariant Galilean algebras are obtained. The first member of this class has dynamical index ... More
Affine Extension of Galilean Conformal Algebra in 2+1 DimensionsSep 07 2009Sep 28 2009We show that a class of nonrelativistic algebras including non centrally-extended Schrodinger algebra and Galilean Conformal Algebra (GCA) has an affine extension in 2+1 hitherto unknown. This extension arises out of the conformal symmetries of the two ... More
PDF's Of The Burgers Equation On The Semiline With Fluctuating Flux At The OriginAug 01 1998We derive the asymptotic behaviour of the one point probability density for the inhomogeneous shock slopes in the turbulent regime, when a Gaussian fluctuating flux at origin derives the system. We also calculate the time dependence of the $x_{f}$ beyond ... More
Transitions in Oscillatory Dynamics of Two Connected Neurons with Excitatory SynapsesMar 04 2002Mar 05 2002It is shown that long term behavior of two connected Integrate- and- Fire neurons with excitatory synapses is determined by some fixed-points. In the case of equal synaptic weights four different dynamic phases are found. Between these phases there is ... More
The LPM effect in sequential bremsstrahlungJan 20 2015Oct 19 2016The splitting processes of bremsstrahlung and pair production in a medium are coherent over large distances in the very high energy limit, which leads to a suppression known as the Landau-Pomeranchuk-Migdal (LPM) effect. We analyze the case when the coherence ... More
AdS/CFT correspondence via R-current correlation functions revisitedMay 18 2005Jul 17 2007Motivated by realizing open/closed string duality in the work by Gopakumar [Phys. Rev. D70:025009,2004], we study two and three-point correlation functions of R-current vector fields in N=4 super Yang-Mills theory. These correlation functions in free ... More
Learning Bounds for Greedy Approximation with Explicit Feature Maps from Multiple KernelsOct 09 2018Nonlinear kernels can be approximated using finite-dimensional feature maps for efficient risk minimization. Due to the inherent trade-off between the dimension of the (mapped) feature space and the approximation accuracy, the key problem is to identify ... More
Building a Lemmatizer and a Spell-checker for Sorani KurdishSep 27 2018The present paper aims at presenting a lemmatization and a word-level error correction system for Sorani Kurdish. We propose a hybrid approach based on the morphological rules and a n-gram language model. We have called our lemmatization and error correction ... More
On Sampling Random Features From Empirical Leverage Scores: Implementation and Theoretical GuaranteesMar 20 2019Random features provide a practical framework for large-scale kernel approximation and supervised learning. It has been shown that data-dependent sampling of random features using leverage scores can significantly reduce the number of features required ... More
$ ρ$ meson-nucleon coupling constant from the soft-wall AdS/QCD modelAug 23 2014Mar 18 2015In the framework of the soft-wall model of AdS/QCD we calculated the $\rho$ meson nucleon coupling constant. Bulk-to boundary propagators for the free vector and spinor fields are presented, whose boundary values correspond to $\rho$ meson and to the ... More
Modeling and Analyzing the Vocal Tract under Normal and Stressful Talking ConditionsJul 01 2017In this research, we model and analyze the vocal tract under normal and stressful talking conditions. This research answers the question of the degradation in the recognition performance of text-dependent speaker identification under stressful talking ... More
All-dielectric Tailored-index Index-matched Arbitrary Waveguides based on Transformation OpticsFeb 24 2019Transformation optics based on conformal mapping (CM) technique provides a practical approach to designing arbitrary-shaped all-dielectric devices. However, CM may result in large impractical refractive indices unachievable by current fabrication techniques. ... More
Long-range optical pulling force device based on vortex beams and transformation opticsJan 08 2019Jan 11 2019In this work a method for generating a long-range optical pulling force is presented which is realized by utilizing a vortex beam and a device designed based on transformation optics through conformal mapping. The device works by transforming an input ... More
The expectation value of the number of loops and the left-passage probability in the double-dimer modelMay 10 2018Jun 27 2018We study various statistical properties of the double-dimer model, a generalization of the dimer model, on rectangular domains of the square lattice. We take advantage of the Grassmannian representation of the dimer model, first to calculate the probability ... More
Virtual Network Embedding Algorithms Based on Best-Fit Subgraph DetectionFeb 10 2015One of the main objectives of cloud computing providers is increasing the revenue of their cloud datacenters by accommodating virtual network requests as many as possible. However, arrival and departure of virtual network requests fragment physical network's ... More
Using Heavy Clique Base Coarsening to Enhance Virtual Network EmbeddingFeb 09 2015Network virtualization allows cloud infrastructure providers to accommodate multiple virtual networks on a single physical network. However, mapping multiple virtual network resources to physical network components, called virtual network embedding (VNE), ... More
Evolutionary value of collective sensingFeb 10 2018We propose a mathematical model for collective sensing in a population growing in a stochastically varying environment. In the population, individuals use an information channel for sensing the environment, and two channels for signal production and comprehension ... More
Some aspects of non-abelian gauge field inflation modelJan 06 2014In this paper we study non-abelian gauge field inflation (gauge-flation) model in the context of intermediate and logamediate scenario. Important parameters of this model are presented for these two cases. Numerical study shows that the intermediate and ... More
Anti--de Sitter/ boundary conformal field theory correspondence in the non-relativistic limitFeb 21 2012Sep 08 2012Boundary conformal field theory (BCFT) is the study of conformal field theory (CFT) in semi-infinite space-time. In non-relativistic limit ($x\rightarrow\epsilon x, t\rightarrow t, \epsilon\rightarrow 0$), boundary conformal algebra changes to boundary ... More
Hidden Conformal Symmetry of Rotating Black Holes in Minimal Five-Dimensional Gauged SupergravityAug 06 2010Jan 12 2011In the present paper we show that for a low frequency limit the wave equation of massless scalar field in the background of non-extremal charged rotating black holes in five-dimensional minimal gauged and ungauged supergravity can be written as the Casimir ... More
Tachyon Logamediate inflation on the braneJul 10 2017According to a Barrow's solution for the scale factor of the universe, the main properties of the tachyon inflation model in the framework of RSII braneworld are studied. Within this framework the basic slow-roll parameters are calculated analytically. ... More
Warm-Intermediate Inflationary Universe Model with Viscous Pressure in High Dissipative RegimeMar 02 2014Warm inflation model with bulk viscous pressure in the context of "intermediate inflation" where the cosmological scale factor expands as $a(t)=a_0\exp(At^f)$, is studied. The characteristics of this model in slow-roll approximation and in high dissipative ... More
Warm-viscous inflation model on the brane in the light of BICEP2Dec 08 2013Oct 06 2014In the present work warm inflationary universe model with viscous pressure on the brane in high-dissipation regime is studied. We derive a condition which is required for this model to be realizable in slow-roll approximation. We also present analytic ... More
Warm Vector InflationSep 10 2013In this paper we introduce the "warm vector inflation" scenario. In warm inflation scenario radiation is produced during the inflation epoch and reheating is avoided. Slow-roll and perturbation parameters of this model are presented. We develop our model ... More
Generalized Massive Gravity and Galilean Conformal Algebra in two dimensionsMar 02 2011Galilean conformal algebra (GCA) in two dimensions arises as contraction of two copies of the centrally extended Virasoro algebra ($t\rightarrow t, x\rightarrow\epsilon x$ with $\epsilon\rightarrow 0$). The central charges of GCA can be expressed in term ... More
Galilean Conformal Algebra in Semi-Infinite SpaceJan 12 2011Sep 18 2011In the present work we considered Galilean conformal algebras (GCA), which arises as a contraction relativistic conformal algebras ($x_i\rightarrow \epsilon x_i$, $t\rightarrow t$, $\epsilon \rightarrow 0$). We can use the Galilean conformal symmetry ... More
Cosmological New Massive Gravity and Galilean Conformal Algebra in 2-dimensionsApr 10 2012In the present paper we consider the realization of $2-$dimensional Galilean conformal algebra ($GCA_2$) on the boundary of cosmological new massive gravity. At first we consider the contracted BTZ black hole solution. We obtain entropy formula for the ... More
Correspondence between the contracted BTZ solution of cosmological topological massive gravity and two-dimensional Galilean conformal algebraFeb 01 2011Sep 21 2011We show that BTZ black hole solution of Cosmological Topological Massive Gravity (CTMG) have a hidden conformal symmetry. In this regard, we consider the wave equation of a massless scalar field propagating in BTZ spacetime and find the wave equation ... More
Radiation of Charged Black Holes and Modified Dispersion RelationMar 25 2016Apr 11 2016We investigate the effects of a modified dispersion relation proposed by Majhi and Vagenas on the Reissner-Nordstrom black hole thermodynamics in a universe with large extra dimensions. It is shown that entropy, temperature and heat capacity receive new ... More
Logarithmic Correlators in Non-relativistic Conformal Field TheoryJan 07 2010Jul 19 2010We show how logarithmic terms may arise in the correlators of fields which belong to the representation of the Schrodinger-Virasoro algebra (SV) or the affine Galilean Conformal Algebra (GCA). We show that in GCA, only scaling operator can have a Jordanian ... More
Universal Statistics of Inviscid Burgers Turbulence in Arbitrary DimensionsJan 25 2000We investigate the non-perturbative results of multi-dimensional forced Burgers equation coupled to the continuity equation. In the inviscid limit, we derive the exact exponents of two-point density correlation functions in the universal region in arbitrary ... More
Printed Arabic Text Recognition using Linear and Nonlinear RegressionFeb 05 2017Arabic language is one of the most popular languages in the world. Hundreds of millions of people in many countries around the world speak Arabic as their native speaking. However, due to complexity of Arabic language, recognition of printed and handwritten ... More
Correlation functions of BCFTSep 18 2011Sep 08 2012Boundary conformal field theory (BCFT) is the study of conformal field theory (CFT) on manifolds with a boundary. We can use conformal symmetry to constrain correlation functions of conformal invariant fields. We compute two-point and three-point functions ... More
Tachyon Warm-Intermediate Inflationary Universe Model in High Dissipative RegimeOct 02 2012We consider tachyonic warm-inflationary models in the context of intermediate inflation. We derive the characteristics of this model in slow-roll approximation and develop our model in two cases, 1- For a constant dissipative parameter $\Gamma$. 2- $\Gamma$ ... More
Hidden Conformal Symmetry of Extremal Kerr-Bolt SpacetimesNov 03 2010We show that extremal Kerr-Bolt spacetimes have a hidden conformal symmetry. In this regard, we consider the wave equation of a massless scalar field propagating in extremal Kerr-Bolt spacetimes and find in the "near region", the wave equation in extremal ... More
Correlation functions for Galilean conformal invariant field theoryOct 02 2010In this paper we consider non-relativistic-conformal group, then we calculate two point function for the fields that are Galilean conformal-invariant, then we show that the correlation function for Galilean conformal-invariant fields in $d=2$ are different ... More
On the Density of Iterated Line Segment IntersectionsDec 07 2005Jul 02 2007Given S_1, a finite set of points in the plane, we define a sequence of point sets S_i as follows: With S_i already determined, let L_i be the set of all the line segments connecting pairs of points of the union of S_1,...,S_i, and let S_i+1 be the set ... More
Topology Identification of Directed Dynamical Networks via Power Spectral AnalysisAug 09 2013We address the problem of identifying the topology of an unknown weighted, directed network of LTI systems stimulated by wide-sense stationary noises of unknown power spectral densities. We propose several reconstruction algorithms based on the cross-power ... More
A Survey of Neighbourhood Construction Models for Categorizing Data PointsOct 07 2018Finding neighbourhood structures is very useful in extracting valuable relationships among data samples. This paper presents a survey of recent neighbourhood construction algorithms for pattern clustering and classifying data points. Extracting neighbourhoods ... More
SRCLock: SAT-Resistant Cyclic Logic Locking for Protecting the HardwareApr 24 2018In this paper, we claim that cyclic obfuscation, when properly implemented, poses exponential complexity on SAT or CycSAT attack. The CycSAT, in order to generate the necessary cycle avoidance clauses, uses a pre-processing step. We show that this pre-processing ... More
Scalar perturbation in warm tachyon inflation in LQC in light of Plank and BICEP2Aug 27 2014We study warm-tachyon inflationary universe model in the context of the effective field theory of loop quantum cosmology. In slow-roll approximation the primordial perturbation spectrums for this model are calculated. We also obtain the general expressions ... More
Warm Gauge-FlationAug 26 2013Non-abelian gauge field inflation is studied in the context of warm inflation scenario. We introduce this scenario as a mechanism that gives an end for gauge-flation model. Slow-roll parameters and perturbation parameters are presented for this model. ... More
Tachyon Warm-Logamediate Inflationary Universe Model in High Dissipative RegimeApr 30 2013In the present work, we study warm tachyon inflation model in the context of "logamediate inflation" where the cosmological scale factor expands as $a=a_0\exp(A[\ln t]^{\lambda})$. The characteristics of this model in slow-roll approximation are presented ... More
Cosmological perturbations in warm-tachyon inflationary universe model with viscous pressure on the braneFeb 03 2013Feb 22 2013We study warm-viscous inflationary universe model on the brane, in a tachyon field theory. We obtain the general conditions which are required for this model to be realizable. In longitudinal gauge, the primoradial perturbation parameters are found in ... More
Cosmological perturbations in warm-tachyon inflationary universe model with viscous pressureJul 09 2014We study the warm-tachyon inflationary universe model with viscous pressure in high-dissipation regime. General conditions which are required for this model to be realizable are derived in the slow-roll approximation. We present analytic expressions for ... More
Irreversible Aging Dynamics and Generic Phase Behavior of Aqueous Suspensions of LaponiteJan 26 2010In this work we study the aging behavior of aqueous suspension of Laponite having 2.8 weight % concentration using rheological tools. At various salt concentration all the samples demonstrate orientational order when observed using crossed polarizers. ... More
Fourier analysis of stationary time series in function spaceMay 09 2013We develop the basic building blocks of a frequency domain framework for drawing statistical inferences on the second-order structure of a stationary sequence of functional data. The key element in such a context is the spectral density operator, which ... More
Prediction of long and short time rheological behavior in soft glassy materialsNov 26 2010Feb 21 2011We present an effective time approach to predict long and short time rheological behavior of soft glassy materials from experiments carried out over practical time scales. Effective time approach takes advantage of relaxation time dependence on aging ... More
Three-Stage Speaker Verification Architecture in Emotional Talking EnvironmentsSep 03 2018Speaker verification performance in neutral talking environment is usually high, while it is sharply decreased in emotional talking environments. This performance degradation in emotional environments is due to the problem of mismatch between training ... More
Physicochemical Effects in Aging Aqueous Laponite SuspensionsJun 24 2013We study aging behavior of aqueous suspension of Laponite as a function of concentration of Laponite, concentration of salt, time elapsed since preparation of suspension (idle time) and temperature by carrying extensive rheological and conductivity experiments. ... More
New physics in inclusive $B \to X_c\ell \barν$ decay in light of $R(D^{(*)})$ measurementsJan 25 2018May 18 2018In this work we study the effects of new-physics (NP) operators with different Lorentz structures on the inclusive $B \to X_c\tau \bar{\nu}$ decay and make predictions for the ratio of total decay rates $R(X_c)=\frac{\Gamma(B \to X_c\tau \bar{\nu}_\tau)}{\Gamma(B ... More
Reconstruction of Directed Networks from Consensus DynamicsMar 13 2013Mar 15 2013This paper addresses the problem of identifying the topology of an unknown, weighted, directed network running a consensus dynamics. We propose a methodology to reconstruct the network topology from the dynamic response when the system is stimulated by ... More
Hyper-aging Dynamics of Nano-clay SuspensionSep 20 2012Aqueous suspension of nanoclay Laponite undergoes structural evolution as a function of time, which enhances its elasticity and relaxation time. In this work we employ effective time approach to investigate long term relaxation dynamics by carrying out ... More
Gauge-QuintessenceOct 03 2015In this work, we introduce a new quintessence model associated with non-Abelian gauge fields, minimally coupled to Einstein gravity. This gauge theory has been originally introduced and studied as an inflationary model, called gauge-flation. Here, however, ... More
Extragalactic maser surveysFeb 13 2018Since the IAU (maser-)Symposium 287 in Stellenbosch/South Africa (Jan. 2012), great progress has been achieved in studying extragalactic maser sources. Sensitivity has reached a level allowing for dedicated maser surveys of extragalactic objects. These ... More
Black Hole Production in the Presence of a Maximal Momentum in Horizon Wave Function FormalismApr 15 2019We study the Horizon Wave Function (HWF) description of a generalized uncertainty principle (GUP) black hole in the presence of two natural cutoffs as a minimal length and a maximal momentum. This is motivated by a metric which allows the existence of ... More