Results for "Vahid Towhidlou"

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A Neural Network Prediction Based Adaptive Mode Selection Scheme in Full-Duplex Cognitive NetworksApr 12 2019We propose a neural network (NN) predictor and an adaptive mode selection scheme for the purpose of both improving secondary user's (SU's) throughput and reducing collision probability to the primary user (PU) in full-duplex (FD) cognitive networks. SUs ... More
Cross-layer Design in Cognitive Radio StandardsNov 26 2017The growing demand for wireless applications and services on the one hand, and limited available radio spectrum on the other hand have made cognitive radio (CR) a promising solution for future mobile networks. It has attracted considerable attention by ... More
Adaptive Full Duplex Communications in Cognitive Radio NetworksOct 16 2017In this paper we propose a novel adaptive scheme for full duplex communication of secondary users (SUs) in a cognitive radio network. The secondary network operates in three modes; Cooperative Sensing (CS), Full Duplex Transmit and Sensing (FDTS), and ... More
Algebraic Specifications of Wayfinding Using Cognitive MapJan 15 2018Oct 15 2018This paper outlines the formal representation of the environment in which it is assumed that a wayfinding process has been occurred through a street network. Wayfinding is a process in which people navigate themselves from an origin to a destination by ... More
Analysis of Gaussian Spatial Models with Covariate Measurement ErrorNov 14 2018Nov 15 2018Uncertainty is an inherent characteristic of biological and geospatial data which is almost made by measurement error in the observed values of the quantity of interest. Ignoring measurement error can lead to biased estimates and inflated variances and ... More
Radiation pattern of the isolated pulsar PSR B1828-11Nov 18 2002Based on the free precession model of the isolated pulsar PSR B1828-11, Link & Epstein 2001) showed that the observed pulse durations require the radio beam to have a non-standard shape: the beam duration is larger for beam sweeps farthest from the dipole ... More
Normal modes of relativistic systems in post-Newtonian approximation and the stability curve of r-modesFeb 19 2000In part I, we use the post-Newtonian (pn) order of Liouville's equation to study the normal modes of oscillation of a spherically symmetric relativistic system. Perturbations that are neutral in Newtonian approximation develop into a new sequence of normal ... More
Representations of the quantum matrix algebra $M_{q,p}(2)$May 19 1993Jun 12 1993It is shown that the finite dimensional irreducible representaions of the quantum matrix algebra $ M_{ q,p}(2) $ ( the coordinate ring of $ GL_{q,p}(2) $) exist only when both q and p are roots of unity. In this case th e space of states has either the ... More
On the Degrees-of-Freedom of Two-Unicast Wireless Networks with Delayed CSITMay 02 2018We characterize the degrees-of-freedom (DoF) region of a class of two-unicast wireless networks under the assumption of delayed channel state information at the transmitters. We consider a layered topology with arbitrary connectivity, and we introduce ... More
Calculation of cluster decays half-lives for nuclei between 56 < Zp < 120 by using temperature dependent proximity modelAug 20 2014Cluster decays half-lives of elements with proton numbers between 56 < Zp < 120 are calculated by applying temperature dependent proximity potential approach. for showing the influence of temperature on cluster decays, we compared the results among temperature ... More
K-Theory Tools For Local and Asymptotic Cyclic CohomologyNov 12 2002A generalization of Connes-Thom isomorphism is given for stable, homotopy invariant, and split exact functors on separable $C^*$-algebras. As examples of these functors, we concentrate on asymptotic and local cyclic cohomology and the result is applied ... More
Urban morphology meets deep learning: Exploring urban forms in one million cities, town and villages across the planetSep 09 2017Sep 12 2017Study of urban form is an important area of research in urban planning/design that contributes to our understanding of how cities function and evolve. However, classical approaches are based on very limited observations and inconsistent methods. As an ... More
An erratum to "Property (RD) for Hecke pairs"Dec 11 2012Dec 12 2012We correct an error in the article "Property (RD) for Hecke pairs".
The quantum de Rham complexes associated with $SL_h(2)$May 24 1993Jun 12 1993Quantum de Rham complexes on the quantum plane and the quantum group itself are constructed for the Zakrewski deformation of $ Fun ( SL(2)) $. As a by-product a new deformation of the two dimensional Heisenberg algeb ra is constructed which can be used ... More
Representations of The Coordinate Ring of $GL_{q}(3)$May 19 1993Jun 12 1993It is shown that the finite dimensional ireducible representations of the quantum matrix algebra $ M_q(3) $ ( the coordinate ring of $ GL_q(3) $ ) exist only when q is a root of unity ( $ q^p = 1 $ ). The dimensions of these representations can only be ... 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
Various commensurability relations in Hecke pairs and property (RD)May 13 2012Dec 12 2012In this paper we continue our study of property (RD) for Hecke pairs initiated in (V. Shirbisheh, Property (RD) for Hecke pairs. Mathematical Physics, Analysis and Geometry, vol. 15, no. 2, (2012), 173--192). We study the behavior of property (RD) under ... More
Computational Machines in a Coexistence with Concrete Universals and Data StreamsSep 10 2017We discuss that how the majority of traditional modeling approaches are following the idealism point of view in scientific modeling, which follow the set theoretical notions of models based on abstract universals. We show that while successful in many ... More
Using quantum friction to synchronize rotating bodiesJul 14 2016Proposing a combined system of a nanoparticle and a plane surface in the presence of electromagnetic vacuum fluctuations, the electromagnetic and medium fields have been quantized. Quantum friction of nanoparticle due to the presence of plane surface ... More
On the precession of the isolated pulsar PSR B1828-11May 13 2002Nov 18 2002Analysis of both pulse timing and pulse shape variations of the isolated pulsar PSR B1828-11 shows highly correlated and strong Fourier power at periods \~ 1000, 500, and 250 d (Stairs et al. 2000). The only description based on a free precession of star's ... More
Large frequency drifts during Type I X-ray burstsApr 08 2003May 21 2003We study the spin-down of a neutron star atmosphere during the Type I X-ray burst in low mass X-ray binaries. Using polar cap acceleration models, we show that the resulting stellar ``wind'' torque on the burning shell due to the flowing charged particles ... More
Bicovariant Differential Geometry of the Quantum Group $SL_h(2)$Apr 18 1994Oct 10 1994There are only two quantum group structures on the space of two by two unimodular matrices, these are the $SL_q(2)$ and the $SL_h(2)$ [9-13] quantum groups. One can not construct a differential geometry on $ SL_q(2)$, which at the same time is bicovariant, ... More
Nonlinear Fourier Transform of Truncated Multi-Soliton PulsesDec 05 2018Multi-soliton pulses, as special solutions of the Nonlinear Schroedinger Equation (NLSE), are potential candidates for optical fiber transmission where the information is modulated and recovered in the so-called nonlinear Fourier domain. For data communication, ... More
Length functions and property (RD) for locally compact Hecke pairsDec 03 2014The purpose of this paper is to study property (RD) for locally compact Hecke pairs. We discuss length functions on Hecke pairs and the growth of Hecke pairs. We establish an equivalence between property (RD) of locally compact groups and property (RD) ... More
Non-minimal Higgs inflation in the context of warm scenario in the light of Planck dataNov 27 2018We investigate the non-minimally Higgs inflaton (HI) model in the context of warm inflation scenario. Warm little inflaton (WLI) model considers the little Higgs boson as inflaton. The concerns of warm inflation model can be eliminated in WLI model. There ... More
Capacity Results for Intermittent X-Channels with Delayed Channel State FeedbackJan 09 2018Apr 09 2019We characterize the capacity region of noiseless X-Channels with intermittent connectivity and delayed channel state information at the transmitters. We consider the general case in which each transmitter has a common message for both receivers and a ... More
Reasoning with shapes: profiting cognitive susceptibilities to infer linear mapping transformations between shapesSep 01 2017Visual information plays an indispensable role in our daily interactions with environment. Such information is manipulated for a wide range of purposes spanning from basic object and material perception to complex gesture interpretations. There have been ... More
Gait Pattern Recognition Using AccelerometersMar 11 2017Motion ability is one of the most important human properties, including gait as a basis of human transitional movement. Gait, as a biometric for recognizing human identities, can be non-intrusively captured signals using wearable or portable smart devices. ... More
Urban Data Streams and Machine Learning: A Case of Swiss Real Estate MarketMar 30 2017In this paper, we show how using publicly available data streams and machine learning algorithms one can develop practical data driven services with no input from domain experts as a form of prior knowledge. We report the initial steps toward development ... More
Quantum Statistical Mechanics of $\mathbb{Q}$-lattices and noncommutative geometryAug 13 2008Aug 21 2008After recalling some basic notions of quantum statistical mechanics, we explain the Bost-Connes system that relates the structure of the maximal abelian extension of $\mathbb{Q}$ to the space of \kms states of a \cs-dynamical system. Afterwards, we study ... More
A relative version of Kummer theoryAug 13 2008Let $E/F$ be a cyclic Galois extension of degree $p^l$ with Galois group $G$. It is shown that the Galois module structure of both sides of the Kummer pairing (for Kummer extensions of $E$) are the same. In other words, we show that the Kummer duality ... More
Amenability of Hecke pairs and a question of EymardNov 11 2013Feb 23 2014In this short paper we show that if $(G,H)$ is an amenable Hecke pair and $\Gamma$ is a subgroup of $G$ containing $H$, then the Hecke pair $(\Gamma, H)$ is amenable too. This answers positively a question of Pierre Eymard, asked in 1972, when it is restricted ... More
R-modes in the ocean of a magnetic neutron starFeb 05 2002Apr 09 2002We study the dynamics of r-modes in the ocean of a magnetic neutron star. We modeled the star's ocean with a spherical rotating thin shell and assumed that the magnetic field symmetry axis is not aligned to the shell's spin axis. In the magnetohydrodynamic ... More
Deforestation Prediction Using Neural Networks and Satellite Imagery in a Spatial Information SystemMar 07 2018Dec 25 2018Deforestation, as one of the challenging environmental problems in the world, has been recorded the most serious threat to environmental diversity and one of the main components of land-use change. In this paper, we investigate spatial distribution of ... More
Bayesian Analysis of Censored Spatial Data Based on a Non-Gaussian ModelJun 18 2017Nov 27 2018In this paper, we suggest using a skew Gaussian-log Gaussian model for the analysis of spatial censored data from a Bayesian point of view. This approach furnishes an extension of the skew log Gaussian model to accommodate to both skewness and heavy tails ... More
Property (RD) for Hecke pairsMar 28 2012May 15 2012As the first step towards developing noncommutative geometry over Hecke C*-algebras, we study property (RD) (Rapid Decay) for Hecke pairs. When the subgroup H in a Hecke pair (G,H) is finite, we show that the Hecke pair (G,H) has (RD) if and only if G ... More
Grand Technologies for Grand Energy Challenges: A Futuristic Scenario for Solar Energy in the Age of InformationAug 22 2017Instead of getting involved in either extremes of dispute around climate change as one of our grand challenges, we opened the space of potential policy responses from a systemic view and showed why current climate change mitigation policies are not successful ... More
Control and Detection of Discrete Spectral Amplitudes in Nonlinear Fourier SpectrumMay 18 2016Nonlinear Fourier division Multiplexing (NFDM) can be realized from modulating the discrete nonlinear spectrum of an $N$-solitary waveform. To generate an $N$-solitary waveform from desired discrete spectrum (eigenvalue and discrete spectral amplitudes), ... More
Algorithm and Related Application for Smart Wearable Devices to Reduce the Risk of Death and Brain Damage in Diabetic ComaOct 08 2015Diabetes is an epidemic disease of the 21st century and is growing globally. Although, final diabetes treatments and cure are still on research phase, related complications of diabetes endanger life of diabetic patients. Diabetic coma which happens with ... More
Locally compact Hecke pairsFeb 11 2014Dec 13 2014We introduce an extended setting to study Hecke pairs $(G,H)$ which admit a regular representation on $L^2(H\backslash G)$, and consequently a $C^*$-algebra. As the result, many pairs of locally compact groups which had been studied in noncommutative ... More
A complete characterization of the spectrum of the Kitaev model on spin laddersApr 22 2009Apr 30 2009We study the Kitaev model on a ladder network and find the complete spectrum of the Hamiltonian in closed form. Closed and manageable forms for all eigenvalues and eigenvectors, allow us to calculate the partition function and averages of non-local operators ... More
Lectures on C*-algebrasNov 14 2012The following topics are presented in these notes: Elements of Banach algebras, Banach algebras of the form $L^1(G)$, where $G$ is a locally compact group, spectrum of elements of Banach algebras, the spectral theory of compact operators on Banach spaces, ... More
Computing With Contextual NumbersAug 05 2014Aug 06 2014Self Organizing Map (SOM) has been applied into several classical modeling tasks including clustering, classification, function approximation and visualization of high dimensional spaces. The final products of a trained SOM are a set of ordered (low dimensional) ... More
General Reaction-Diffusion Processes With Separable Equations for Correlation FunctionsApr 20 2002May 24 2002We consider general multi-species models of reaction diffusion processes and obtain a set of constraints on the rates which give rise to closed systems of equations for correlation functions. Our results are valid in any dimension and on any type of lattice. ... More
Representations of The Coordinate Ring of $ GL_{q}(n) $}Jun 12 1993It is shown that the finite dimensional irreducible representations of the quantum matrix algebra $ M_q(n) $ ( the coordinate ring of $ GL_q(n) $ ) exist only when q is a root of unity ( $ q^p = 1 $ ). The dimensions of these representations can only ... More
Q-Boson Representation of the Quantum Matrix Algebra $M_q(3)$May 19 1993Jun 12 1993{Although q-oscillators have been used extensively for realization of quantum universal enveloping algebras,such realization do not exist for quantum matrix algebras ( deformation of the algebra of functions on the group ). In this paper we first construct ... More
On an Extension of Stochastic Approximation EM Algorithm for Incomplete Data ProblemsNov 21 2018Nov 28 2018The Stochastic Approximation EM (SAEM) algorithm, a variant stochastic approximation of EM, is a versatile tool for inference in incomplete data models. In this paper, we review the fundamental EM algorithm and then focus especially on the stochastic ... More
Cyber-Physical Attacks on UAS Networks- Challenges and Open Research ProblemsFeb 04 2017Assignment of critical missions to unmanned aerial vehicles (UAV) is bound to widen the grounds for adversarial intentions in the cyber domain, potentially ranging from disruption of command and control links to capture and use of airborne nodes for kinetic ... More
A new algorithm for mixed equilibrium problem and Bregman strongly nonexpansive mappings in Banach spacesDec 01 2015In this paper, we study a new iterative method for a common fixed point of a finite family of Bregman strongly nonexpansive mappings in the frame work of reflexive real Banach spaces. Moreover, we prove the strong convergence theorem for finding common ... More
Proximal Point Algorithm for Quasi-convex Minimization Problems in metric spacesNov 06 2016In this paper, the proximal point algorithm for quasi-convex minimization problem in nonpositive curvature metric spaces is studied. We prove $\Delta$-convergence of the generated sequence to a critical point (which is defined in the text) of an objective ... More
Monotone and Pseudo-Monotone Equilibrium Problems in Hadamard SpacesNov 06 2016We study equilibrium problems in Hadamard spaces, which extend variational inequalities and many other problems in nonlinear analysis. In this paper, first we study the existence of solutions of equilibrium problems associated with pseudo-monotone bifunctions ... More
Towards quantitative methods to assess network generative modelsSep 05 2018Assessing generative models is not an easy task. Generative models should synthesize graphs which are not replicates of real networks but show topological features similar to real graphs. We introduce an approach for assessing graph generative models ... More
Asymptotically Pseudo-Independent MatricesSep 02 2018Oct 29 2018We show that the family of pseudo-random matrices recently discovered by Soloveychik, Xiang, and Tarokh in their work `Symmetric Pseudo-Random Matrices' exhibits asymptotic independence. More specifically, any two sequences of matrices of matching sizes ... More
Phonon transport across a Si-Ge interface: the role of inelastic bulk scatteringAug 31 2018Dec 17 2018Understanding phonon transport across heterojunctions is important to achieve a wide range of thermal transport properties. Using the McKelvey-Shockley flux method with first-principles modeling, we theoretically investigate the phonon transport properties ... More
Channel Estimation for Massive MIMO Communication System Using Deep Neural NetworkJun 24 2018In this paper we consider the problem of sparse signal recovery in Multiple Measurement Vectors (MMVs) case. Recently, ample researches have been conducted to solve this problem and diverse methods are proposed, one of which is deep neural network approach. ... More
Electric nonadiabatic geometric entangling gates on spin qubitsDec 14 2016Jul 10 2017Producing and maintaining entanglement reside at the heart of the optimal construction of quan- tum operations and are fundamental issues in the realization of universal quantum computation. We here introduce a setup of spin qubits that allows for geometric ... More
Exact generation of quantum states by the dynamics of spin chainsFeb 19 2019We design a quasi-one dimensional spin chain with engineered coupling strengths such that the natural dynamics of the spin chain evolves a single excitation localized at the left hand site to any specified single particle state on the whole chain. Our ... More
Quantum secret sharing based on reusable GHZ states as secure carriersApr 21 2002Mar 10 2003We introduce a protocol for quantum secret sharing based on reusable entangled states. The entangled state between the sender and the receiver acts only as a carrier to which data bits are entangled by the sender and disentangled from it by the receivers, ... More
Comment on "Delayed luminescence of biological systems in terms of coherent states" [Phys. Lett. A 293 (2002) 93]Dec 13 2010Popp and Yan [F. A. Popp, Y. Yan, Phys. Lett. A 293 (2002) 93] proposed a model for delayed luminescence based on a single time-dependent coherent state. We show that the general solution of their model corresponds to a luminescence that is a linear function ... More
Vorticity affects the stability of neutron starsSep 22 1999Dec 14 1999The spin rate \Omega of neutron stars at a given temperature T is constrained by the interplay between gravitational-radiation instabilities and viscous damping. Navier-Stokes theory has been used to calculate the viscous damping timescales and produce ... More
Lattice Topological Field Theory on Non-Orientable SurfacesAug 10 1995Aug 14 1995The lattice definition of the two-dimensional topological quantum field theory [Fukuma, {\em et al}, Commun.~Math.~Phys.\ {\bf 161}, 157 (1994)] is generalized to arbitrary (not necessarily orientable) compact surfaces. It is shown that there is a one-to-one ... More
Cohering and de-cohering power of quantum channelsJun 07 2015Dec 13 2016We introduce the concepts of cohering and de-cohering power of quantum channels. Using the axiomatic definition of coherence measure, we show that the optimizations required for calculations of these measures can be restricted to pure input states and ... More
Two-User Erasure Interference Channels with Local Delayed CSITMar 11 2015Jul 25 2016We study the capacity region of two-user erasure interference channels with local delayed channel state information at the transmitters. In our model, transmitters have local mismatched outdated knowledge of the channel gains. We propose a transmission ... More
Scalable star-shape architecture for universal spin-based nonadiabatic holonomic quantum computationAug 26 2018Nonadiabatic holonomic quantum computation as one of the key steps to achieve fault tolerant quantum information processing has so far been realized in a number of physical settings. However, in some physical systems particularly in spin qubit systems, ... More
Stationary Geometric Graphical Model SelectionJun 10 2018Oct 29 2018We consider the problem of model selection in Gaussian Markov fields in the sample deficient scenario. In many practically important cases, the underlying networks are embedded into Euclidean spaces. Using the natural geometric structure, we introduce ... More
When Does Spatial Correlation Add Value to Delayed Channel State Information?Jun 22 2016Fast fading wireless networks with delayed knowledge of the channel state information have received significant attention in recent years. An exception is networks where channels are spatially correlated. This paper characterizes the capacity region of ... More
Light Microscopy: An ongoing contemporary revolutionDec 10 2014Jun 08 2015Optical microscopy is one of the oldest scientific instruments that is still used in forefront research. Ernst Abbe's nineteenth century formulation of the resolution limit in microscopy let generations of scientists believe that optical studies of individual ... More
Modeling polymerization of microtubules: a quantum mechanical approachAug 27 2007Oct 22 2008In this paper a quantum mechanical description of the assembly/disassembly process for microtubules is proposed. We introduce creation and annihilation operators that raise or lower the microtubule length by a tubulin layer. Following that, the Hamiltonian ... More
On Delay-independent Stability of a class of Nonlinear Positive Time-delay SystemsJul 01 2013We present a condition for delay-independent stability of a class of nonlinear positive systems. This result applies to systems that are not necessarily monotone and extends recent work on cooperative nonlinear systems.
An ANN-based Method for Detecting Vocal Fold PathologyFeb 07 2013There are different algorithms for vocal fold pathology diagnosis. These algorithms usually have three stages which are Feature Extraction, Feature Reduction and Classification. While the third stage implies a choice of a variety of machine learning methods, ... More
The Faults in Our Pi Stars: Security Issues and Open Challenges in Deep Reinforcement LearningOct 23 2018Since the inception of Deep Reinforcement Learning (DRL) algorithms, there has been a growing interest in both research and industrial communities in the promising potentials of this paradigm. The list of current and envisioned applications of deep RL ... More
Effects of anisotropy on interacting ghost dark energy in Brans-Dicke theoriesMar 11 2016Dec 12 2016By interacting ghost dark energy (ghost DE) in the framework of Brans-Dicke theory, a spatially homogeneous and anisotropic Bianchi type I Universe has been studied. For this purpose, we use the squared sound speed $c_s^2$ whose sign determines the stability ... More
A Markovian Model of the Evolving World Input-Output NetworkNov 26 2016Sep 02 2017The initial theoretical connections between Leontief input-output models and Markov chains were established back in 1950s. However, considering the wide variety of mathematical properties of Markov chains, there has not been a full investigation of evolving ... More
RL-Based Method for Benchmarking the Adversarial Resilience and Robustness of Deep Reinforcement Learning PoliciesJun 03 2019This paper investigates the resilience and robustness of Deep Reinforcement Learning (DRL) policies to adversarial perturbations in the state space. We first present an approach for the disentanglement of vulnerabilities caused by representation learning ... More
Uniform limit theorems under random truncationJul 26 2016In this paper we study uniform versions of two limit theorems in random left truncation model (RLTM). The law of large numbers (LLN) and the central limit theorem (CLT) have been obtained under the bracketing entropy conditions in this setting. The uniform ... More
Lie symmetries and conservation laws of the Hirota-Ramani equationNov 22 2011In this paper, Lie symmetry method is performed for the Hirota-Ramani (H-R) equation. We will find The symmetry group and optimal systems of Lie subalgebras. Furthermore, preliminary classification of its group invariant solutions, symmetry reduction ... More
Cohering and de-cohering power of quantum channelsJun 07 2015Sep 06 2015We introduce the concepts of cohering and de-cohering power of quantum channels. Using the axiomatic definition of coherence measure, we show that the optimizations required for calculations of these measures can be restricted to pure input states and ... More
Electromagnetic field quantization in the presence of a rotating bodyMar 10 2014Starting from a Lagrangian, the electromagnetic field is quantized in the presence of a body rotating along its axis of symmetry. Response functions and fluctuation-dissipation relations are obtained. A general formula for rotational friction and power ... More
Testing modified gravity with dwarf spheroidal galaxiesSep 12 2016The observed velocity dispersion of the classical dwarf spheroidal (dSph) galaxies of the Milky Way (MW) requires the Newtonian stellar mass-to-light ($M_*/L$) ratios in the range of about 10 to more than 100 solar units that are well outside the acceptable ... More
Quantum Secret Sharing and Random Hopping; Using single states instead of entanglementJun 09 2015Jul 18 2015Quantum protocols for secret sharing usually rely on multi-party entanglement which with present technology is very difficult to achieve. Recently it has been shown that sequential manipulation and communication of a single $d-$ level state can do the ... More
New Conditions for Sparse Phase RetrievalOct 04 2013Aug 15 2014We consider the problem of sparse phase retrieval, where a $k$-sparse signal ${\bf x} \in {\mathbb R}^n \textrm{ (or } {\mathbb C}^n\textrm{)}$ is measured as ${\bf y} = |{\bf Ax}|,$ where ${\bf A} \in {\mathbb R}^{m \times n} \textrm{ (or } {\mathbb ... 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
Direct optical sensing of single unlabeled small proteins and super-resolution microscopy of their binding sitesOct 28 2013Oct 29 2013More than twenty years ago, scientists succeeded in pushing the limits of optical detection to single molecules using fluorescence. This breakthrough has revolutionized biophysical measurements, but restrictions in photophysics and labeling protocols ... More
Negative Norm States in de Sitter Space and QFT without Renormalization ProcedureJun 06 2000Nov 15 2002In recent papers [1,2], it has been shown that the presence of negative norm states or negative frequency solutions are indispensable for a fully covariant quantization of the minimally coupled scalar field in de Sitter space. Their presence, while leaving ... More
Covariant two point function for minimally coupled scalar field in de Sitter space-timeMay 08 2000Oct 13 2000In a recent paper [1], it has been shown that negative norm states are indispensable for a fully covariant quantization of the minimally coupled scalar field in de Sitter space. Their presence, while leaving unchanged the physical content of the theory, ... More
Two-qubit state sharing between N parties using only Bell pairs and Bell-measurementJun 14 2009Jun 23 2009A quantum protocol for sharing an arbitrary two-qubit state between N parties is introduced. Any of the members, can retrieve the state, only with collaboration of the other parties. We will show that in terms of resources, i.e. the number of classical ... More
A Distributed Dynamic Frequency Allocation AlgorithmNov 21 2007Mar 13 2008We consider a network model where the nodes are grouped into a number of clusters and propose a distributed dynamic frequency allocation algorithm that achieves performance close to that of a centralized optimal algorithm. Each cluster chooses its transmission ... More
Single-molecule spectroscopy near structured dielectricsOct 06 1998We present an analytical approach to the calculation of the linewidth and lineshift of an atom or molecule in the near field of a structured dielectric surface. For soft surface corrugations with amplitude lambda/50, we find variations of the linewidth ... More
Effect of anisotropy on generalized Chaplygin gas scalar field and its interaction with other dark energy modelsDec 07 2016In this work, we establish a correspondence between the interacting holographic, new agegraphic dark energy and generalized Chaplygin gas model in Bianchi type I universe. In continue, we reconstruct the potential of the scalar field which describes the ... More
Adversarial Reinforcement Learning Framework for Benchmarking Collision Avoidance Mechanisms in Autonomous VehiclesJun 04 2018With the rapidly growing interest in autonomous navigation, the body of research on motion planning and collision avoidance techniques has enjoyed an accelerating rate of novel proposals and developments. However, the complexity of new techniques and ... More
Whatever Does Not Kill Deep Reinforcement Learning, Makes It StrongerDec 23 2017Recent developments have established the vulnerability of deep Reinforcement Learning (RL) to policy manipulation attacks via adversarial perturbations. In this paper, we investigate the robustness and resilience of deep RL to training-time and test-time ... More
Causal Event Networks: Cognition, Complexity and Physical LawsFeb 26 2014Information flow framed in a computational and complexity context is relevant to the understanding of cognitive processes and awareness. In this paper, we begin with analyzing an information theory framework developed in recent years under Information ... More
The influence of anisotropic Rashba spin-orbit coupling on current-induced spin polarization in grapheneApr 13 2017Jun 08 2017We consider a disordered graphene layer with anisotropic Rashba spin-orbit coupling subjected to a longitudinal electric field. Using the linear response theory we calculate current-induced spin polarization including in-plane normal and parallel components ... More
Sequential Triggers for Watermarking of Deep Reinforcement Learning PoliciesJun 03 2019This paper proposes a novel scheme for the watermarking of Deep Reinforcement Learning (DRL) policies. This scheme provides a mechanism for the integration of a unique identifier within the policy in the form of its response to a designated sequence of ... More
Analysis and Improvement of Adversarial Training in DQN Agents With Adversarially-Guided Exploration (AGE)Jun 03 2019This paper investigates the effectiveness of adversarial training in enhancing the robustness of Deep Q-Network (DQN) policies to state-space perturbations. We first present a formal analysis of adversarial training in DQN agents and its performance with ... More
Bivariate Discrete Generalized Exponential DistributionJan 13 2017In this paper we develop a bivariate discrete generalized exponential distribution, whose marginals are discrete generalized exponential distribution as proposed by Nekoukhou, Alamatsaz and Bidram ("Discrete generalized exponential distribution of a second ... More
A Robust Stability Condition for Subhomogeneous Cooperative Time-delay SystemsJul 01 2013May 15 2014In this manuscript, we present conditions for delay-independent stability of subhomogeneous cooperative time-delay systems. We consider the case where the time-delay system has a unique equilibrium at the origin and the case where it has a unique equilibrium ... More
Sequential quantum secret sharing in noisy environmentsSep 27 2017Sep 29 2017Sequential Quantum Secret Sharing schemes (QSS) do not use entangled states for secret sharing, rather they rely on sequential operations of the players on a single state which is circulated between the players. In order to check the viability of these ... More