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Results for "Kai Wang"

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An efficient algorithm to test forcibly-connectedness of graphical degree sequencesMar 02 2018We present an algorithm to test whether a given graphical degree sequence is forcibly connected or not and prove its correctness. We also outline the extensions of the algorithm to test whether a given graphical degree sequence is forcibly $k$-connected ... More
Efficient Counting of Degree SequencesApr 14 2016Feb 14 2017Novel dynamic programming algorithms to count the set $D(n)$ of zero-free degree sequences of length $n$, the set $D_c(n)$ of degree sequences of connected graphs on $n$ vertices and the set $D_b(n)$ of degree sequences of biconnected graphs on $n$ vertices ... More
An efficient algorithm to test forcibly-biconnectedness of graphical degree sequencesMay 03 2018We present an algorithm to test whether a given graphical degree sequence is forcibly biconnected or not and prove its correctness. The worst case run time complexity of the algorithm is shown to be exponential but still much better than the previous ... More
Dynamics of a mean-reverting stochastic volatility model with regime switchingMar 07 2019In this paper, we consider a mean-reverting stochastic volatility model with regime switching, and present some sufficient conditions for the existence of global positive solution, asymptotically bounded in pth moment, positive recurrent and existence ... More
Combined effects of disorders and electron-electron interactions upon metal-insulator transition in 2D non-bipartite latticeMay 16 2004We examined the characteristics of a metal-insulator transition on a two-dimensional non-bipartite lattice when both disorders and electron interactions are present. Using a real-space renormalization group method and finite-size scaling analysis we have ... More
Scaling of entanglement in finite arrays of exchange-coupled quantum dotsMay 16 2004We present a finite-size scaling analysis of the entanglement in a two-dimensional arrays of quantum dots modeled by the Hubbard Hamiltonian on a triangular lattice. Using multistage block renormalization group approach, we have found that there is an ... More
From rules to runs: A dynamic epistemic take on imperfect information gamesDec 07 2015In the literature of game theory, the information sets of extensive form games have different interpretations, which may lead to confusions and paradoxical cases. We argue that the problem lies in the mix-up of two interpretations of the extensive form ... More
GeV Majorana Neutrinos in Top-quark Decay at the LHCOct 29 2008We explore the \Delta L=2 same-sign dilepton signal from top-quark decay via a Majorana neutrino at the LHC in the top anti-top pair production samples. The signature is same-sign dilepton plus multi-jets with no significant missing energy. The most optimistic ... More
An Improved Algorithm for Counting Graphical Degree SequencesJun 26 2018We present an improved version of a previous efficient algorithm that computes the number $D(n)$ of zero-free graphical degree sequences of length $n$. A main ingredient of the improvement lies in a more efficient way to compute the function $P(N,k,l,s)$ ... More
Anisotropic spin transport in two-terminal mesoscopic rings: the Rashba and Dresselhaus spin-orbit interactionsMar 17 2008We investigate theoretically the spin transport in two-terminal mesoscopic rings in the presence of both the Rashba spin-orbit interaction (RSOI) and the Dresselhaus spin-orbit interaction (DSOI). We find that the interplay between the RSOI and DSOI breaks ... More
Static post-Newtonian limits in non-projectable Hořava-Lifshitz gravity with an extra U(1) symmetryDec 30 2012May 03 2013In this paper, we study static post-Newtonian limits in non-projectable Ho\v{r}ava-Lifshitz gravity with an extra U(1) symmetry. After obtaining all static spherical solutions in the infrared, we apply them to the solar system tests, and obtain the Eddington-Robertson-Schiff ... More
M-estimation in high-dimensional linear modelMar 12 2018We mainly study the M-estimation method for the high-dimensional linear regression model, and discuss the properties of M-estimator when the penalty term is the local linear approximation. In fact, M-estimation method is a framework, which covers the ... More
Asymptotic properties of a stochastic Gilpin-Ayala model under regime switchingJun 05 2016Jun 05 2018In this paper, a stochastic Gilpin-Ayala population model with regime switching and white noise is considered. All parameters are influenced by stochastic perturbations. The existence of global positive solution, asymptotic stability in probability, $p$th ... More
Chromatic number of Euclidean planeJul 01 2015If the chromatic number of Euclidean plane is larger than four, but it is known that the chromatic number of planar graphs is equal to four, then how does one explain it? In my opinion, they are contradictory to each other. This idea leads to confirm ... More
Flavor dependence of annihilation parameters in QCD factorizationApr 28 2013Aug 11 2013For $B_{d,s} \to \pi^\mp K^\pm$ and $K^{(\ast)} K^{(\ast)}$ decays, the flavor symmetry breaking effects may be particularly small since the final state interactions should be the same between the corresponding $B_d$ and $B_s$ decays due to the charge ... More
Probe $CP$ property in $Hγγ$ coupling through interferenceDec 01 2017Oct 18 2018The diphoton invariant mass distribution of interference between $gg\to H \to \gamma\gamma$ and $gg\to \gamma\gamma$ is almost antisymmetric around the Higgs mass $M_H$. We propose a new observable $A_{int}$ to quantify this effect, which is a ratio of ... More
Representing Extended Finite State Machines for SDL by A Novel Control Model of Discrete Event SystemsJun 24 2016This paper discusses EFSM for SDL and transforms EFSM into a novel control model of discrete event systems. We firstly propose a control model of discrete event systems, where the event set is made up of several conflicting pairs and control is implemented ... More
Pseudospin Hall effect of light in photonic crystals with Weyl pointsApr 02 2017The study of spin-orbit coupling of photons has attracted much attention in recent years, and leads to many potential applications in optics. In the recently discovered metamaterial -- photonic crystals with Weyl points, the pseudospin-orbit coupling ... More
Some Remarks On Essentially Normal SubmodulesApr 03 2012Given a *-homomorphism $\sigma: C(M)\to \mathscr{L}(\mathcal{H})$ on a Hilbert space $\mathcal{H}$ for a compact metric space $M$, a projection $P$ onto a subspace $\mathcal{P}$ in $\mathcal{H}$ is said to be essentially normal relative to $\sigma$ if ... More
A harmonic analysis approach to essential normality of principal submodulesJan 04 2011Aug 18 2011Guo and the second author have shown that the closure $[I]$ in the Drury-Arveson space of a homogeneous principal ideal $I$ in $\mathbb{C}[z_1,...,z_n]$ is essentially normal. In this note, the authors extend this result to the closure of any principal ... More
Smoothing methods comparison for CMB E- and B-mode separationNov 04 2015The anisotropies of the B-mode polarization in the cosmic microwave background radiation play a crucial role for the study of the very early Universe. However, in the real observation, the mixture of the E-mode and B-mode can be caused by the partial ... More
Surface Plasmonic Lattice Solitons in Semi-infinite Graphene Sheet ArraysNov 21 2016We investigate the surface plasmonic lattice solitons (PLSs) in semi-infinite graphene sheet arrays. The surface soliton is formed as the SPPs tunneling is inhibited by the graphene nonlinearity, and meanwhile the incident power should be above a threshold ... More
Fusion and quasi-fission dynamics in nearly-symmetric reactionsNov 04 2015Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics (ImQMD) model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the stability of an individual nucleus and ... More
Probing the statistical properties of CMB $B$-mode polarization through Minkowski FunctionalsOct 27 2015Jul 11 2016The detection of the magnetic type $B$-mode polarization is the main goal of future cosmic microwave background (CMB) experiments. In the standard model, the $B$-mode map is a strongly non-gaussian field due to the lensed component. Besides the two-point ... More
Holographic Superconductors in Horava-Lifshitz GravityJun 18 2014We consider holographic superconductors related to the Schwarzschild black hole in the low energy limit of Ho\v{r}ava-Lifshitz spacetime. The non-relativistic electromagnetic and scalar fields are introduced to construct a holographic superconductor model ... More
A robust estimation for the extended t-process regression modelDec 18 2018Robust estimation and variable selection procedure are developed for the extended t-process regression model with functional data. Statistical properties such as consistency of estimators and predictions are obtained. Numerical studies show that the proposed ... More
Relative and Mean Motions of Multi-Machine Power Systems in Classical ModelJun 20 2017It is well-known that in an m-machine power system where each machine is represented by a second-order differential equation, the Jacobian of the system equation contains (m-1) pairs of conjugate eigenvalues and two real eigenvalues, including at least ... More
Nonlinear Modal Decoupling of Multi-Oscillator Systems with Applications to Power SystemsNov 14 2016Many natural and manmade dynamical systems that are modeled as large nonlinear multi-oscillator systems like power systems are hard to analyze. For such a system, we propose a nonlinear modal decoupling (NMD) approach inversely constructing as many decoupled ... More
Power System Transient Stability Analysis Using Truncated Taylor Expansion SystemsNov 01 2018Small signal analysis is a special case of analytical approaches using Taylor expansions of power system differential equations with the truncation performed at order one. The truncated Taylor expansions (TTEs) at higher orders can lead to better approaches ... More
Transient High-energy Gamma-rays and Neutrinos from Nearby Type II SupernovaeJan 17 2019The dense wind environment (or circumstellar medium) may be ubiquitous for the regular Type II supernovae (SNe) before the explosion, the interaction of which with the SN ejecta could result in a wind breakout event. The shock generated by the interaction ... More
Holomorphic isometries from the unit ball into symmetric domainsMar 11 2016Feb 01 2017We construct isometric holomorphic embeddings of the unit ball into higher rank symmetric domains, first discovered by Mok, in an explicit way using Jordan triple systems, and prove uniqueness results for all domains, including the exceptional domains ... More
Static electromagnetic fields and charged black holes in general covariant theory of Horava-Lifshitz gravityOct 07 2011Jan 23 2012In this paper, we study electromeganetic static spacetimes in the nonrelativisitc general covariant theory of the Horava-Lifshitz (HL) gravity, proposed recently by Horava and Melby-Thompson, and present all the electric static solutions, which represent ... More
SVM-based Deep Stacking NetworksFeb 15 2019The deep network model, with the majority built on neural networks, has been proved to be a powerful framework to represent complex data for high performance machine learning. In recent years, more and more studies turn to nonneural network approaches ... More
Fast and Flexible Indoor Scene Synthesis via Deep Convolutional Generative ModelsNov 29 2018We present a new, fast and flexible pipeline for indoor scene synthesis that is based on deep convolutional generative models. Our method operates on a top-down image-based representation, and inserts objects iteratively into the scene by predicting their ... More
Dimensional Scaling Treatment with Relativistic Corrections for Stable Multiply Charged Atomic Ions in High-Frequency Super-Intense Laser FieldsAug 29 2011We present a theoretical framework which describes multiply-charged atomic ions, their stability within super-intense laser fields,also lay corrections to the systems due to relativistic effects. Dimensional scaling calculations with relativistic corrections ... More
Factorization of event-plane correlations over transverse momentum in relativistic heavy ion collisions in a multi-phase transport modelSep 20 2015Momentum-space azimuthal harmonic event planes (EP) are constructed from final-state midrapidity particles binned in transverse momentum (pT ) in sqrt(s_NN) = 200 GeV Au+Au collisions in a multi-phase transport (AMPT) model. The EP correlations between ... More
Bayesian Optimal Data Detector for mmWave OFDM System with Low-Resolution ADCApr 12 2017Orthogonal frequency division multiplexing (OFDM) has been widely used in communication systems operating in the millimeter wave (mmWave) band to combat frequency-selective fading and achieve multi-Gbps transmissions, such as IEEE 802.15.3c and IEEE 802.11ad. ... More
A Time-Power Series Based Semi-Analytical Approach for Power System SimulationApr 19 2018Time domain simulation is the basis of dynamic security assessment for power systems. Traditionally, numerical integration methods are adopted by simulation software to solve nonlinear power system differential-algebraic equations about any given contingency ... More
Superconducting cosmic strings as sources of cosmological fast radio burstsMay 31 2017Nov 03 2017In this paper we calculate the radio burst signals from three kinds of structures of superconducting cosmic strings. By taking into account the observational factors including scattering and relativistic effects, we derive the event rate of radio bursts ... More
Multiparty-controlled remote preparation of four-qubit cluster-type entangled statesNov 19 2014We present a strategy for implementing multiparty-controlled remote state preparation (MCRSP) for a family of four-qubit cluster-type states with genuine entanglements while employing, Greenberg-Horne-Zeilinger-class states as quantum channels. In this ... More
To Achieve Maximal Throughputs in CSMA Wireless Networks Through Offered_load ControlApr 28 2014This paper studies how to achieve the maximal link throughputs in a CSMA wireless network through offered-load control. First, we propose an analytical model, contention-graph-combination (CGC), to describe the relationship between the offered-load and ... More
A Revisit to Top Quark Forward-Backward AsymmetryApr 01 2011We analyze various models for the top quark forward-backward asymmetry ($A^t_{FB}$) at the Tevatron, using the latest CDF measurements on different $A^t_{FB}$s and the total cross section. The axigluon model in Ref. \cite{paul} has difficulties in explaining ... More
Systematic study of 16O-induced fusions with the improved quantum molecular dynamics modelNov 12 2014The heavy-ion fusion reactions with 16O bombarding on 62Ni, 65Cu, 74Ge, 148Nd, 180Hf, 186W, 208Pb, 238U are systematically investigated with the improved quantum molecular dynamics (ImQMD) model. The fusion cross sections at energies near and above the ... More
Influences of Topological Defect on Spin Hall EffectJan 18 2013Apr 08 2013We study the influence of topological defect on the spin current as well as the spin Hall effect. We find that the nontrivial deformation of the space-time due to topological defect can generate a spin dependent current which then induces an imbalanced ... More
Collider Phenomenology of $e^{-}e^{-}\to W^{-}W^{-}$Oct 09 2016Mar 07 2017Whether in nature exists Majorana neutrino is one of the most fundamental questions in physics. It is directly related to the violation of accidental $U(1)$-lepton number symmetry(LNV). Enormous efforts had been put into such test and among them, one ... More
Static and rotating universal horizons and black holes in gravitational theories with broken Lorentz invarianceMar 17 2016Jun 13 2016In this paper, we show the existence of static and rotating universal horizons and black holes in gravitational theories with the broken Lorentz invariance. We pay particular attention on the ultraviolet regime, and show that universal horizons and black ... More
Frequency domain TRINICON-based blind source separation method with multi-source activity detection for sparsely mixed signalsFeb 25 2018The TRINICON ('Triple-N ICA for convolutive mixtures') framework is an effective blind signal separation (BSS) method for separating sound sources from convolutive mixtures. It makes full use of the non-whiteness, non-stationarity and non-Gaussianity ... More
Beyond News Contents: The Role of Social Context for Fake News DetectionDec 20 2017Dec 10 2018Social media is becoming popular for news consumption due to its fast dissemination, easy access, and low cost. However, it also enables the wide propagation of fake news, i.e., news with intentionally false information. Detecting fake news is an important ... More
Collect at Once, Use Effectively: Making Non-interactive Locally Private Learning PossibleJun 11 2017Non-interactive Local Differential Privacy (LDP) requires data analysts to collect data from users through noisy channel at once. In this paper, we extend the frontiers of Non-interactive LDP learning and estimation from several aspects. For learning ... More
Multi-Stage Holomorphic Embedding Method for Calculating the Power-Voltage CurveMay 04 2017The recently proposed non-iterative load flow method, called the holomorphic embedding method, may encounter the precision issue, i.e. nontrivial round-off errors caused by the limit of digits used in computation when calculating the power-voltage (P-V) ... More
Nonlinear Modal Decoupling Based Power System Transient Stability AnalysisNov 09 2018Nonlinear modal decoupling (NMD) was recently proposed to nonlinearly transform a multi-oscillator system into a number of decoupled oscillators which together behave the same as the original system in an extended neighborhood of the equilibrium. Each ... More
Conic singularities metrics with prescribed scalar curvature: a priori estimates for normal crossing divisorsMay 13 2018The purpose of this paper is to prove the a priori estimates for constant scalar curvature Kaehler metrics with conic singularities along normal crossing divisors. The zero order estimates are proved by a reformulated version of Alexandrov's maximum ... More
Solar system tests and interpretation of gauge field and Newtonian prepotential in general covariant Hořava-Lifshitz gravityJun 06 2012Jan 07 2013We study spherically symmetric, stationary vacuum configurations in general covariant theory (U(1) extension) of Ho\v{r}ava-Lifshitz gravity with the projectability condition and an arbitrary coupling constant $\lambda$, and obtain all the solutions in ... More
Spin-dependent tunneling through a symmetric semiconductor barrier: the Dresselhaus effectSep 26 2005Sep 27 2005Spin-dependent tunneling through a symmetric semiconductor barrier is studied including the k^3 Dresselhaus effect. The spin-dependent transmission of electron can be obtained analytically. By comparing with previous work(Phys. Rev. B 67. R201304 (2003) ... More
Topological photonic crystal with equifrequency Weyl pointsNov 30 2015Jul 01 2016Weyl points in three-dimensional photonic crystals behave as monopoles of Berry flux in momentum space. Here, based on general symmetry analysis, we show that a minimal number of four symmetry-related (consequently equifrequency) Weyl points can be realized ... More
Approximate Capacities of Two-Dimensional Codes by Spatial MixingJan 20 2014Feb 25 2014We apply several state-of-the-art techniques developed in recent advances of counting algorithms and statistical physics to study the spatial mixing property of the two-dimensional codes arising from local hard (independent set) constraints, including: ... More
A Concept Learning Tool Based On Calculating Version Space CardinalityMar 23 2018In this paper, we proposed VeSC-CoL (Version Space Cardinality based Concept Learning) to deal with concept learning on extremely imbalanced datasets, especially when cross-validation is not a viable option. VeSC-CoL uses version space cardinality as ... More
An Improved Traffic Matrix Decomposition Method with Frequency-Domain RegularizationMar 16 2012Nov 23 2012We propose a novel network traffic matrix decomposition method named Stable Principal Component Pursuit with Frequency-Domain Regularization (SPCP-FDR), which improves the Stable Principal Component Pursuit (SPCP) method by using a frequency-domain noise ... More
Hourglass semimetals with nonsymmorphic symmetries in three dimensionsFeb 20 2017Aug 09 2017It was recently shown that nonsymmorphic space group symmetries can protect novel surface states with hourglass-like dispersions. In this paper, we show that such dispersions can also appear in the bulk of three-dimensional (3D) systems which respect ... More
Scars in Dirac fermion systems: the influence of an Aharonov--Bohm fluxMay 09 2017Time-reversal ($\mathcal{T}$-) symmetry is fundamental to many physical processes. Typically, $\mathcal{T}$-breaking for microscopic processes requires the presence of magnetic field. However, for 2D massless Dirac billiards, $\mathcal{T}$-symmetry is ... More
Detailed balance condition and ultraviolet stability of scalar field in Horava-Lifshitz gravityMar 22 2011Apr 23 2011Detailed balance and projectability conditions are two main assumptions when Horava recently formulated his theory of quantum gravity - the Horava-Lifshitz (HL) theory. While the latter represents an important ingredient, the former often believed needs ... More
Hochschild (co)homologies of dg $K$-rings and their Koszul dualsOct 14 2018We formulate the (co)bar construction theory of dg $K$-(co)rings and the calculus theory of the Hochschild homology and cohomology of dg $K$-rings. As applications, we compare the Hochschild (co)homologies of a complete typical dg $K$-ring and its Koszul ... More
Leveraging Crowd for Game-based Learning: A Case Study of Privacy Education Game Design and Evaluation by CrowdsourcingMar 09 2016As the Internet grows in importance, it is vital to develop methods and techniques for educating end-users to improve their awareness of online privacy. Web-based education tools have been proven effective in many domains and have been increasingly adopted ... More
Critical Height for the Destabilization of Solar Prominences: Statistical Results from STEREO ObservationsSep 17 2011At which height will a prominence inclined to be unstable, or where is the most probable critical height for the prominence destabilization? This question is statistically studied based on 362 solar limb prominences well-recognized by SLIPCAT from 2007 ... More
Is polarization effect visible in leptonic SUSY searches?Dec 05 2013On-shell effective theory approach has been widely used in search of various supersymmetric signals, in particular, gluino/squark pairs with long cascade decay chains in which complete matrix element calculations may encounter over-20 dimensional integrations. ... More
Joint Channel-and-Data Estimation for Large-MIMO Systems with Low-Precision ADCsJan 22 2015The use of low precision (e.g., 1-3 bits) analog-to-digital convenors (ADCs) in very large multiple-input multiple-output (MIMO) systems is a technique to reduce cost and power consumption. In this context, nevertheless, it has been shown that the training ... More
Topological states in A15 superconductorsJul 09 2018Superconductors with the A15 structure are prototypical type-II s-wave superconductors which have generated considerable interest in early superconducting material history. However, the topological nature of the electronic structure remains unnoticed ... More
Nested Quantum Error Correction CodesSep 28 2009The theory of quantum error correction was established more than a decade ago as the primary tool for fighting decoherence in quantum information processing. Although great progress has already been made in this field, limited methods are available in ... More
QCD corrections to e^+ e^- to J/ψ(ψ(2S))+χ_{cJ} (J=0,1,2) at B FactoriesJul 13 2011Aug 15 2011We analytically calculate the cross sections of double charmonium production in $e^+ e^- \to J/\psi(\psi(2S))\chi_{cJ}$ (J=0,1,2) at next-to-leading order (NLO) in $\alpha_s$ in nonrelativistic QCD, and confirm factorization of these processes. In contrast ... More
J/psi (psi') production at the Tevatron and LHC at O(α_s^4v^4) in nonrelativistic QCDSep 19 2010Jan 27 2011We present a complete evaluation for $\jpsi(\psip)$ prompt production at the Tevatron and LHC at next-to-leading order in nonrelativistic QCD, including color-singlet, color-octet, and higher charmonia feeddown contributions. The short-distance coefficients ... More
Probing the noncommutative effects of phase space in the time-dependent Aharonov-Bohm effectMay 12 2016We study the noncommutative corrections on the time-dependent Aharonov-Bohm effect when both the coordinate-coordinate and momentum-momentum noncommutativities are considered. This study is motivated by the recent observation that there is no net phase ... More
Time-dependent Aharonov-Bohm effect on the noncommutative spaceMar 17 2016Jun 09 2016We study the time-dependent Aharonov-Bohm effect on the noncommutative space. Because there is no net Aharonov-Bohm phase shift in the time-dependent case on the commutative space, therefore, a tiny deviation from zero indicates new physics. Based on ... More
Fusion-fission reactions with modified Woods-Saxon potentialDec 15 2007A modified Woods-Saxon potential model is proposed for a unified description of the entrance channel fusion barrier and the fission barrier of fusion-fission reactions based on the Skyrme energy-density functional approach. The fusion excitation functions ... More
Learning Piece-wise Linear Models from Large Scale Data for Ad Click PredictionApr 18 2017CTR prediction in real-world business is a difficult machine learning problem with large scale nonlinear sparse data. In this paper, we introduce an industrial strength solution with model named Large Scale Piece-wise Linear Model (LS-PLM). We formulate ... More
LCANet: End-to-End Lipreading with Cascaded Attention-CTCMar 13 2018Machine lipreading is a special type of automatic speech recognition (ASR) which transcribes human speech by visually interpreting the movement of related face regions including lips, face, and tongue. Recently, deep neural network based lipreading methods ... More
Supplementary Material to: Passive Controller Realization of a Biquadratic Impedance with Double Poles and Zeros as a Seven-Element Series-Parallel Network for Effective Mechanical ControlOct 12 2018This report presents some supplementary material to the paper entitled "Passive controller realization of a biquadratic impedance with double poles and zeros as a seven-element Series-parallel network for effective mechanical control" [1].
A Heuristic Scheduling Scheme in Multiuser OFDMA NetworksSep 19 2008Conventional heterogeneous-traffic scheduling schemes utilize zero-delay constraint for real-time services, which aims to minimize the average packet delay among real-time users. However, in light or moderate load networks this strategy is unnecessary ... More
Scheduling Computation Graphs of Deep Learning Models on Manycore CPUsJul 16 2018For a deep learning model, efficient execution of its computation graph is key to achieving high performance. Previous work has focused on improving the performance for individual nodes of the computation graph, while ignoring the parallelization of the ... More
Trajectory Prediction of Rotating Objects in Viscous Fluid: Based on Kinematic Investigation of Magnus GliderOct 10 2016The case of a rotating object traveling through viscous fluid appears in many phenomena like the banana ball and missile movement. In this work, we build a model to predict the trajectory of such rotating objects with near-cylinder geometry. The analytical ... More
Riemannian kernel based Nyström method for approximate infinite-dimensional covariance descriptors with application to image set classificationJun 16 2018In the domain of pattern recognition, using the CovDs (Covariance Descriptors) to represent data and taking the metrics of the resulting Riemannian manifold into account have been widely adopted for the task of image set classification. Recently, it has ... More
Deep Learning-based CSI Feedback Approach for Time-varying Massive MIMO ChannelsJul 31 2018Massive multiple-input multiple-output (MIMO) systems rely on channel state information (CSI) feedback to perform precoding and achieve performance gain in frequency division duplex (FDD) networks. However, the huge number of antennas poses a challenge ... More
Exploring the Partially-obscured BLR and Partially-covered NLRFeb 25 2009We have conducted a series of investigations on the geometry of the reddening material in AGNs, which have important implications to the AGN unification and SMBH demography. According to our statistics of partially obscured quasars, we found that SMBHs ... More
Connection Between Mid-Infrared Emission Properties and Narrow Line Region Outflows in Type 1 Active Galactic NucleiMar 09 2013Mar 14 2013The location of warm dust producing the Mid-infrared (MIR) emission in Type 1 Active Galactic Nuclei (AGNs) is complex and not yet fully known. We explore this problem by studying how the MIR covering factor (CF_{MIR} =L_{MIR}/L_{bol}) correlates with ... More
Efficient Counting of Degree SequencesApr 14 2016Apr 22 2016A simple algorithm to count the set $D(n)$ of zero-free degree sequences of length $n$ exactly based on a known recurrence is presented. Several novel recurrences about the cardinalities of various subsets of $D(n)$ are also derived and used to provide ... More
Performance of Joint Channel and Physical Network Coding Based on Alamouti STBCMay 22 2013This work considers the protograph-coded physical network coding (PNC) based on Alamouti space-time block coding (STBC) over Nakagami-fading two-way relay channels, in which both the two sources and relay possess two antennas. We first propose a novel ... More
Constraints on the Universal Varying Yukawa Couplings: from SM-like to FermiophobicMar 22 2012Oct 07 2012Varying the Standard Model (SM) fermion Yukawa couplings universally by a generic positive scale factor ($F_{Yu}$), we study the phenomenological fit to the current available experimental results for the Higgs boson search at hadron colliders. We point ... More
Characterizing the Impact of the Workload on the Value of Dynamic Resizing in Data CentersJul 26 2012May 11 2014Energy consumption imposes a significant cost for data centers; yet much of that energy is used to maintain excess service capacity during periods of predictably low load. Resultantly, there has recently been interest in developing designs that allow ... More
$π^+π^+$ and $π^+π^-$ colliding in noncommutative spaceMar 08 2012By studying the scattering process of scalar particle pion on the noncommutative scalar quantum electrodynamics, the non-commutative amendment of differential scattering cross-section is found, which is dependent of polar-angle and the results are significantly ... More
Deformations of the spin currents by topological screw dislocation and cosmic dispirationOct 27 2015We study the spin currents induced by topological screw dislocation and cosmic dispiration. By using the extended Drude model, we find that the spin dependent forces are modified by the nontrivial geometry. For the topological screw dislocation, only ... More
Seiberg-Witten map and quantum phase effects for neutral Dirac particle on noncommutatiave planeOct 23 2014Mar 19 2016We provide a new approach to study the noncommutative effects on the neutral Dirac particle with anomalous magnetic or electric dipole moment on the noncommutative plane. The advantages of this approach are demonstrated by investigating the noncommutative ... More
Deep Discriminant Analysis for i-vector Based Robust Speaker RecognitionMay 03 2018Linear Discriminant Analysis (LDA) has been used as a standard post-processing procedure in many state-of-the-art speaker recognition tasks. Through maximizing the inter-speaker difference and minimizing the intra-speaker variation, LDA projects i-vectors ... More
End-to-end Learning for Short Text ExpansionAug 30 2017Effectively making sense of short texts is a critical task for many real world applications such as search engines, social media services, and recommender systems. The task is particularly challenging as a short text contains very sparse information, ... More
Optimization of Battery Energy Storage to Improve Power System Oscillation DampingNov 26 2018A placement problem for multiple Battery Energy Storage System (BESS) units is formulated towards power system transient voltage stability enhancement in this paper. The problem is solved by the Cross-Entropy (CE) optimization method. A simulation-based ... More
Spherical Principal Component AnalysisMar 16 2019Principal Component Analysis (PCA) is one of the most important methods to handle high dimensional data. However, most of the studies on PCA aim to minimize the loss after projection, which usually measures the Euclidean distance, though in some fields, ... More
Graph Neural Networks for User Identity LinkageMar 06 2019The increasing popularity and diversity of social media sites has encouraged more and more people to participate in multiple online social networks to enjoy their services. Each user may create a user identity to represent his or her unique public figure ... More
Tunable Magnetic Skyrmions in Ultrathin Magnetic Nanostructures for Cellular-Level NeurostimulationJan 05 2019In 2016, the Global Burden of Disease reported that neurological disorders were the principal cause of disability-adjusted life years (DALYs) and the second leading cause of deaths. Research in the last decade has pushed neuroscience to design and implement ... More
$4\times4$ unextendible product basis and genuinely entangled spaceJan 18 2019We show that there are six inequivalent $4\times4$ unextendible product bases (UPBs) of size eight, when we consider only 4-qubit product vectors. We apply our results to construct Positive-Partial-Transpose entangled states of rank nine. They are at ... More
Wireless Powered Dense Cellular Networks: How Many Small Cells Do We Need?Apr 02 2017Apr 04 2017This paper focuses on wireless powered 5G dense cellular networks, where base station (BS) delivers energy to user equipment (UE) via the microwave radiation in sub-6 GHz or millimeter wave (mmWave) frequency, and UE uses the harvested energy for uplink ... More
Efficient Private ERM for Smooth ObjectivesMar 29 2017May 24 2017In this paper, we consider efficient differentially private empirical risk minimization from the viewpoint of optimization algorithms. For strongly convex and smooth objectives, we prove that gradient descent with output perturbation not only achieves ... More
Comprehensive Constraints on a Spin-3/2 Singlet Particle as a Dark Matter CandidateFeb 17 2013We consider the proposal that dark matter (DM) is composed of a spin-3/2 particle that is a singlet of the standard model (SM). Its leading effective interactions with ordinary matter involve a pair of their fields and a pair of SM fermions, in the form ... More