Results for "Yang Cheng"

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Virtual Reality based Learning SystemsMay 28 2016This article is based on studies of the existing literature, focusing on the states-of-the-arts on virtual reality (VR) and its potential uses in learning. Different platforms have been used to improve the learning effects of VR that offers exciting opportunities ... More
Higher spin holography with Galilean symmetry in general dimensionsJul 29 2015We construct Schroedinger-like solutions of the Vasiliev higher spin theory in D>3 dimension. Symmetries of such solutions and the linearised equation of motion for the scalar on such backgrounds are analysed. We further propose Galilean invariant bosonic ... More
Quadratic Discriminant Analysis under Moderate DimensionAug 29 2018Quadratic discriminant analysis (QDA) is a simple method to classify a subject into two populations, and was proven to perform as well as the Bayes rule when the data dimension p is fixed. The main purpose of this paper is to examine the empirical and ... More
Higher-dimensional Hasimoto transform and Euler fluids: counterexamples and generalizationsFeb 23 2019Mar 17 2019The Hasimoto transform takes the binormal equation to the NLS and barotropic fluid equations. We show that in higher dimensions its existence would imply the conservation of the Willmore energy in skew-mean-curvature flows and present a counterexample ... More
Stability and instability of standing waves for a generalized Choquard equation with potentialApr 23 2016Apr 27 2016We are going to study the standing waves for a generalized Choquard equation with potential: $$ -i\partial_t u-\Delta u+V(x)u=(|x|^{-\mu}\ast|u|^p)|u|^{p-2}u, \ \ \hbox{in}\ \ \mathbb{R}\times\mathbb{R}^3, $$ where $V(x)$ is a real function, $0<\mu<3$, ... More
Weak KAM Theorem for a Class of Infinite-Dimensional Lagrangian systemsSep 27 2016In this paper, we study infinite-dimensional Lagrangian systems where the potential functions are periodic, rearrangement invariant and weakly upper semicontinuous. And we prove that there exists a calibrated curve for every $M\in L^{2}(I)$.
Averaging, symplectic reduction, and central extensionsJun 05 2018Jan 12 2019We show that the averaged equation for a one-frequency fast-oscillating system is the result of symplectic reduction of a certain natural Hamiltonian system with respect to an $S^1$-action. Furthermore, if the reduced configuration space happens to be ... More
Classification of symmetry fractionalization in gapped $\mathbb Z_2$ spin liquidsJun 14 2016Mar 20 2018In quantum spin liquids, fractional spinon excitations carry half-integer spins and other fractional quantum numbers of lattice and time-reversal symmetries. Different patterns of symmetry fractionalization distinguish different spin liquid phases. In ... More
Energy Non-linearity study at Daya BayMar 06 2014Mar 25 2014The Daya Bay Reactor Neutrino Experiment has measured a non-zero value of the neutrino mixing angle $\theta_{13}$ with a significance of 7.7 standard deviations by a rate-only a nalysis. The distortion of neutrino energy spectrum carries additional oscillation ... More
Spin and helicity of massive particlesJul 19 2016Sep 07 2016It is a well-known fact that helicity is a Lorentz-invariant for massless but not for massive particles. Nevertheless, a satisfactory proof of this fact and a detailed analysis on the relative orientation between spin and the momentum are not readily ... More
Object Recognition by Using Multi-level Feature Point ExtractionOct 28 2017In this paper, we present a novel approach for object recognition in real-time by employing multilevel feature analysis and demonstrate the practicality of adapting feature extraction into a Naive Bayesian classification framework that enables simple, ... More
Reconstruction of sparse wavelet signals from partial Fourier measurementsJun 05 2015In this paper, we show that high-dimensional sparse wavelet signals of finite levels can be constructed from their partial Fourier measurements on a deterministic sampling set with cardinality about a multiple of signal sparsity.
Nonresonant Three-body Decays of D and B MesonsMay 14 2002Aug 16 2002Nonresonant three-body decays of D and B mesons are studied. It is pointed out that if heavy meson chiral perturbation theory (HMChPT) is applied to the heavy-light strong and weak vertices and assumed to be valid over the whole kinematic region, then ... More
Universal bounds for eigenvalues of a buckling problem IIAug 26 2009Jul 11 2011In this paper, we investigate universal estimates for eigenvalues of a buckling problem. For a bounded domain in a Euclidean space, we give a positive contribution for obtaining a sharp universal inequality for eigenvalues of the buckling problem. For ... More
Charmful Baryonic B Decays $\bar B^0\toΛ_c\bar p$ and $\bar B\toΛ_c\bar pπ(ρ)$Oct 19 2001Jan 16 2002We study the two-body and three-body charmful baryonic B decays: $\bar B^0\to \Lambda_c\bar p$ and $\bar B\to \Lambda_c \bar p\pi(\rho)$. The factorizable W-exchange contribution to $\bar B^0\to\Lambda_c\bar p$ is negligible. Applying the bag model to ... More
Charmless B -> VV Decays in QCD Factorization: Implications of Recent $B\to φK^*$ MeasurementApr 09 2001May 11 2001In the heavy quark limit, both vector mesons in the charmless B -> VV decay should have zero helicity and the corresponding amplitude is proportional to the form factor difference $(A_1-A_2)$. The first observed charmless $B\to VV$ mode, $B\to\phi K^*$, ... More
$B\to f_0(980)K$ Decays and Subleading CorrectionsJan 27 2005Feb 22 2005The decay $B\to f_0(980)K is studied within the framework of QCD factorization and the two-quark scenario for $f_0(980)$. There are two distinct penguin contributions and their interference depends on the unknown mixing angle $\theta$ of strange and nonstrange ... More
Analysis of B-> φK Decays in QCD FactorizationDec 13 2000May 09 2001We analyze the decay $B\to \phi K$ within the framework of QCD-improved factorization. We found that although the twist-3 kaon distribution amplitude dominates the spectator interactions, it will suppress the decay rates slightly. The weak annihilation ... More
Implications of Recent Measurements of Hadronic Charmless B DecaysOct 11 1999Mar 01 2000Implications of recent CLEO measurements of hadronic charmless B decays are discussed. (i) Employing the Bauer-Stech-Wirbel (BSW) model for form factors as a benchmark, the $B\to\pi^+\pi^-$ data indicate that the form factor $F_0^{B\pi}(0)$ is smaller ... More
$B \to J/ψK$ Decays in QCD FactorizationNov 14 2000Aug 29 2016The hadronic decays $B\to J/\psi K(K^*)$ are interesting because experimentally they are the only color-suppressed modes which have been measured, and theoretically they are calculable by QCD factorization even the emitted meson $J\psi$ is heavy. We analyze ... More
Hadronic B Decays to Charmed BaryonsOct 21 2002We study exclusive B decays to final states containing a charmed baryon within the pole model framework. Since the strong coupling for $\Lambda_b\bar B N$ is larger than that for $\Sigma_b \bar BN$, the two-body charmful decay $B^-\to\Sigma_c^0\bar p$ ... More
Penguin-Induced Radiative Baryonic B DecaysJan 04 2002Jan 21 2002Weak radiative baryonic B decays $B\to\B_1\ov \B_2\gamma$ mediated by the electromagnetic penguin process $b\to s\gamma$ have appreciable rates larger than their two-body counterparts $B\to\B_1\ov \B_2$. The branching ratios for $B^-\to\Lambda\bar p\gamma$ ... More
Charmless Exclusive Baryonic B DecaysDec 18 2001Jun 17 2002We present a systematical study of two-body and three-body charmless baryonic B decays. Branching ratios for two-body modes are in general very small, typically less than $10^{-6}$, except that $\B(B^-\to p \bar\Delta^{--})\sim 1\times 10^{-6}$. In general, ... More
Branching Ratios and Polarization in B-> VV,VA,AA DecaysMay 04 2008Oct 09 2008We present a detailed study of charmless two-body B decays into final states involving two vector mesons (VV) or two axial-vector mesons (AA) or one vector and one axial-vector meson (VA), within the framework of QCD factorization, where $A$ is either ... More
Hadronic charmless B decays B-> APSep 03 2007Nov 18 2007The two-body hadronic decays of B mesons into pseudoscalar and axial vector mesons are studied within the framework of QCD factorization. The light-cone distribution amplitudes (LCDAs) for $^3P_1$ and $^1P_1$ axial-vector mesons have been evaluated using ... More
Phenomenological Analysis of D Meson LifetimesMay 12 1999The QCD-based operator-product-expansion technique is systematically applied to the study of charmed meson lifetimes. We stress that it is crucial to take into account the momentum of the spectator light quark of charmed mesons, otherwise the destructive ... More
Updated Analysis of a_1 and a_2 in Hadronic Two-body Decays of B MesonsNov 05 1998Feb 04 1999Using the recent experimental data of $B\to D^{(*)}(\pi,\rho)$, $B\to D^{(*)} D_s^{(*)}$, $B\to J/\psi K^{(*)}$ and various model calculations on form factors, we re-analyze the effective coefficients a_1 and a_2 and their ratio. QCD and electroweak penguin ... More
Updated Analysis of $a_2/a_1$ in Exclusive B DecaysSep 25 1998Using recent experimental data and various theoretical calculations on form factors, we reanalyze the effective parameters $a_1$ and $a_2$ and their ratio.
A cost-effective shuffling method against DDoS attacks using Moving Target DefenseMar 25 2019Apr 01 2019Moving Target Defense(MTD) has emerged as a good solution to alter the asymmetric situation of attacks and defenses, shuffling-based moving target defense has been regarded as one of the most effective ways to mitigate DDoS attacks. However, previous ... More
Continuous phase transition from Néel state to Z_2 spin liquid state on a square latticeAug 13 2013Jun 20 2014Recent numerical studies of the $J_1$-$J_2$ model on a square lattice suggest a possible continuous phase transition between the N\'eel state and a gapped spin-liquid state with Z$_2$ topological order. We show that such a phase transition can be realized ... More
Gravitational Corrections to Fermion Masses in Grand Unified TheoriesMay 02 2011We reconsider quantum gravitational threshold effects to the unification of fermion masses in Grand Unified Theories. We show that the running of the Planck mass can have a sizable effect on these thresholds which are thus much more important than naively ... More
Zee model and Neutrinoless double beta decayMar 05 2002Apr 02 2002The original Zee model can easily accommodate a bi-maximal mixing solution for the atmospheric and solar neutrino problems. From the most recent fit to the data we obtain a set of parameters for the Zee model. However, the recent claim on a positive signal ... More
Ill-posedness of the Prandtl equations in Sobolev spaces around a shear flow with general decayApr 30 2016Motivated by the paper by D. Gerard-Varet and E. Dormy [JAMS, 2010] about the linear ill-posedness for the Prandtl equations around a shear flow with exponential decay in normal variable, and the recent study of well-posedness on the Prandtl equations ... More
Charmless Hadronic B Decays into a Tensor MesonOct 16 2010Feb 16 2011Two-body charmless hadronic B decays involving a tensor meson in the final state are studied within the framework of QCD factorization (QCDF). Due to the G-parity of the tensor meson, both the chiral-even and chiral-odd two-parton light-cone distribution ... More
Penguin-induced Radiative Baryonic B Decays RevisitedNov 28 2005Weak radiative baryonic B decays $\bar B\to B_1\bar B_2\gamma$ mediated by the electromagnetic penguin process $b\to s\gamma$ are re-examined within the framework of the pole model. The meson pole contribution that has been neglected before is taken into ... More
Nonspectator Effects and B Meson Lifetimes from a Field-theoretic CalculationMay 05 1998Jul 09 1998The B meson lifetime ratios are calculated to the order of $1/m_b^3$ in the heavy quark expansion. The predictions of those ratios are dependent on four unknown hadronic parameters $B_1$, $B_2$, $\epsilon_1$ and $\epsilon_2$, where $B_1$ and $B_2$ parametrize ... More
Three-Body Charmful Baryonic B Decays $\bar B\to D(D^*)N\bar N$Aug 21 2002We study the charmful three-body baryonic B decays $\bar B\to D^{(*)}N\bar N$: the color-allowed modes $\bar B^0\to D^{(*)+}n\bar p$ and the color-suppressed ones $\bar B^0\to D^{(*)0}p\bar p$. While the $D^{*+}/D^+$ production ratio is predicted to be ... More
An Efficient Network Intrusion Detection System Based on Feature Selection and Ensemble ClassifierApr 02 2019Since Internet is so popular and prevailing in human life, countering cyber threats, especially attack detection, is a challenging area of research in the field of cyber security. Intrusion detection systems (IDSs) are essential entities in a network ... More
Identifying Dark Matter Event Topologies at the LHCDec 08 2010Assuming dark matter particles can be pair-produced at the LHC from cascade decays of heavy particles, we investigate strategies to identify the event topologies based on the kinematic information of final state visible particles. This should be the first ... More
Long-Bone Fracture Detection using Artificial Neural Networks based on Contour Features of X-ray ImagesFeb 21 2019The following paper proposes two contour-based fracture detection schemes. The development of the contour-based fracture is based on the line-based fracture detection schemes proposed in arXiv:1902.07458. Existing Computer Aided Diagnosis (CAD) systems ... More
A Likelihood Ratio Approach for Precise Discovery of Truly Relevant Protein MarkersApr 11 2018The process of biomarker discovery is typically lengthy and costly, involving the phases of discovery, qualification, verification, and validation before clinical evaluation. Being able to efficiently identify the truly relevant markers in discovery studies ... More
Multi-Shell Shell Model for Heavy NucleiJun 19 2003Performing a shell model calculation for heavy nuclei has been a long-standing problem in nuclear physics. Here we propose one possible solution. The central idea of this proposal is to take the advantages of two existing models, the Projected Shell Model ... More
What Makes a Good Team? A Large-scale Study on the Effect of Team Composition in Honor of KingsFeb 18 2019Team composition is a central factor in determining the effectiveness of a team. In this paper, we present a large-scale study on the effect of team composition on multiple measures of team effectiveness. We use a dataset from the largest multiplayer ... More
Phase Retrieval of Real-Valued Signals in a Shift-Invariant SpaceMar 04 2016Phase retrieval arises in various fields of science and engineering and it is well studied in a finite-dimensional setting. In this paper, we consider an infinite-dimensional phase retrieval problem to reconstruct real-valued signals living in a shift-invariant ... More
Hyperbolicity versus non-hyperbolic ergodic measures inside homoclinic classesJul 29 2015We prove that, for $C^1$-generic diffeomorphisms, if a homoclinic class is not hyperbolic, then there is a non-hyperbolic ergodic measure supported on it. This proves a conjecture by D\'iaz and Gorodetski [28]. We also discuss the conjectured existence ... More
Exactly Solvable Models for Symmetry-Enriched Topological PhasesJun 27 2016Sep 07 2017We construct fixed-point wave functions and exactly solvable commuting-projector Hamiltonians for a large class of bosonic symmetry-enriched topological (SET) phases, based on the concept of equivalent classes of symmetric local unitary transformations. ... More
Generating Periodic Grain Boundary Structures: Algorithm and Open-Source Python LibraryJul 03 2018An algorithm implemented in an open-source python library was developed for building periodic coincidence site lattice (CSL) grain boundary models in a universal fashion. The software framework aims to generate tilt and twist grain boundaries from cubic ... More
Depth Estimation via Affinity Learned with Convolutional Spatial Propagation NetworkAug 01 2018Depth estimation from a single image is a fundamental problem in computer vision. In this paper, we propose a simple yet effective convolutional spatial propagation network (CSPN) to learn the affinity matrix for depth prediction. Specifically, we adopt ... More
On the Sobolev quotient of three-dimensional CR manifoldsApr 09 2019We exhibit examples of compact three-dimensional CR manifolds of positive Webster class, {\em Rossi spheres}, for which the pseudo-hermitian mass as defined in \cite{CMY17} is negative, and for which the infimum of the CR-Sobolev quotient is not attained. ... More
Generalized Clifford Algebras as Algebras in Suitable Symmetric Linear Gr-CategoriesOct 15 2015Jan 12 2016By viewing Clifford algebras as algebras in some suitable symmetric Gr-categories, Albuquerque and Majid were able to give a new derivation of some well known results about Clifford algebras and to generalize them. Along the same line, Bulacu observed ... More
MHD boundary layers theory in Sobolev spaces without monotonicity. I. well-posedness theoryNov 17 2016Jan 16 2017We study the well-posedness theory for the MHD boundary layer. The boundary layer equations are governed by the Prandtl type equations that are derived from the incompressible MHD system with non-slip boundary condition on the velocity and perfectly conducting ... More
Lightweight Fault Tolerance in Large-Scale Distributed Graph ProcessingJan 25 2016The success of Google's Pregel framework in distributed graph processing has inspired a surging interest in developing Pregel-like platforms featuring a user-friendly "think like a vertex" programming model. Existing Pregel-like systems support a fault ... More
A positive mass theorem in three dimensional Cauchy-Riemann geometryDec 30 2013We define an ADM-like mass, called p-mass, for an asymptotically flat pseudohermitian manifold. The p-mass for the blow-up of a compact pseudohermitian manifold (with no boundary) is identified with the first nontrivial coefficient in the expansion of ... More
Temperature-dependent gap equations and their solutions in the SU(4) model of high-temperature superconductivityAug 03 2005Temperature-dependent gap equations in the SU(4) model of high-Tc superconductivity are derived and analytical solutions are obtained. Based on these solutions, a generic gap diagram describing the features of energy gaps as functions of doping P is presented ... More
Efficient and accurate numerical schemes for a hydrodynamically coupled phase field diblock copolymer modelJan 20 2017In this paper, we consider numerical approximations of a hydrodynamically coupled phase field diblock copolymer model, in which the free energy contains a kinetic potential, a gradient entropy, a Ginzburg-Landau double well potential, and a long range ... More
B Decays as Spectroscope for Charmed Four-quark StatesMay 05 2003The $D_s(2320)$ state recently observed by BaBar in the $D_s^+\pi^0$ channel may be the first of a host of $cq\bar q\bar q$ four-quark states. We give a phenomenological account of the masses and decay modes. The isosinglet $D_s(2320)$ state is the only ... More
Learning Depth with Convolutional Spatial Propagation NetworkOct 04 2018Oct 13 2018Depth prediction is one of the fundamental problems in computer vision. In this paper, we propose a simple yet effective convolutional spatial propagation network (CSPN) to learn the affinity matrix for various depth estimation tasks. Specifically, it ... More
PTracer A Linux Kernel Patch Trace BotMar 08 2019PatchNet demonstrates a promising prospect of using hierarchical deep learning to classify Linux kernel patches. It identifies bug-fixing patches, which should be back ported to long-term stable versions, from all patches in the mainline Linux kernel. ... More
iZone: A Location-Based Mobile Social Networking SystemNov 13 2010The rapid development of wireless technology, the extensive use of mobile phones and the availability of location information are facilitating personalized location-based applications. Easy to carry, easy to use and easy to buy, smart phones with certain ... More
Characterization and control of linear coupling using turn-by-turn beam position monitor data in storage ringsJun 19 2017We introduce a new application of measuring symplectic generators to characterize and control the linear betatron coupling in storage rings. From synchronized and consecutive BPM (Beam Position Monitor) turn-by-turn (TbT) readings, symplectic Lie generators ... More
Non-asymptotic theory for nonparametric testingFeb 04 2017We consider nonparametric testing in a non-asymptotic framework. Our statistical guarantees are exact in the sense that Type I and II errors are controlled for any finite sample size. Meanwhile, one proposed test is shown to achieve minimax optimality ... More
Lifetimes of Doubly Charmed BaryonsSep 19 2018Nov 27 2018The lifetimes of doubly charmed hadrons are analyzed within the framework of the heavy quark expansion (HQE). Lifetime differences arise from spectator effects such as $W$-exchange and Pauli interference. The $\Xi_{cc}^{++}$ baryon is longest-lived in ... More
Deep Hierarchical Machine: a Flexible Divide-and-Conquer ArchitectureDec 03 2018We propose Deep Hierarchical Machine (DHM), a model inspired from the divide-and-conquer strategy while emphasizing representation learning ability and flexibility. A stochastic routing framework as used by recent deep neural decision/regression forests ... More
Exotic orbits due to spin-spin coupling around Kerr black holesOct 05 2016Sep 06 2017We report exotic orbital phenomena of spinning test particles orbiting around a Kerr black hole, i.e., some orbits of spinning particles are asymmetrical about the equatorial plane. When a nonspinning test particle orbits around a Kerr black hole in a ... More
Inhomogeneity, Dynamical Symmetry, and Complexity in High-Temperature Superconductors: Reconciling a Universal Phase Diagram with Rich Local DisorderOct 31 2008A model for high-temperature superconductors incorporating antiferromagnetism, d-wave superconductivity, and no double lattice-site occupancy can give energy surfaces exquisitely balanced between antiferromagnetic and superconducting order for specific ... More
Generalizing the Cooper-Pair Instability to Doped Mott InsulatorsOct 21 2008Copper oxides become superconductors rapidly upon doping with electron holes, suggesting a fundamental pairing instability. The Cooper mechanism explains normal superconductivity as an instability of a fermi-liquid state, but high-temperature superconductors ... More
SU(4) Model of High-Temperature Superconductivity: Manifestation of Dynamical Symmetry in CupratesFeb 02 2005The mechanism that leads to high-temperature superconductivity in cuprates remains an open question despite intense study for nearly two decades. Here, we introduce an SU(4) model for cuprate systems having many similarities to dynamical symmetries known ... More
A Unified Description of Cuprate and Iron Arsenide SuperconductorsAug 08 2009We propose a unified description of cuprate and iron-based superconductivity. Consistency with magnetic structure inferred from neutron scattering implies significant constraints on the symmetry of the pairing gap for the iron-based superconductors. We ... More
Deep ColorizationApr 30 2016This paper investigates into the colorization problem which converts a grayscale image to a colorful version. This is a very difficult problem and normally requires manual adjustment to achieve artifact-free quality. For instance, it normally requires ... More
Isoperimetric domains in homogeneous three-manifolds and the isoperimetric constant of the Heisenberg group $\mathsf{H}^1$Jan 29 2015Feb 16 2015In this paper we prove that isoperimetric sets in three-dimensional homogeneous spaces diffeomorphic to $\mathbb{R}^3$ are topological balls. We also prove that in three-dimensional homogeneous spheres isopermetric sets are either two-spheres or symmetric ... More
The Origin of Fermi Arcs in Cuprate Pseudogap States and Strong Constraints on Viable Theories of High-Temperature SuperconductivityMay 06 2007Oct 01 2007A full Fermi surface exists in underdoped high-temperature superconductors if the temperature T lies above the pseudogap temperature T*. Below T* only arcs of Fermi surface survive, scaling with T/T* as T -> 0, with T* displaying strong doping dependence. ... More
Near Mass Degeneracy in the Scalar Meson Sector: Implications for $B^*_{(s)0}$ and $B'_{(s)1}$ MesonsApr 14 2014Jun 10 2014The empirical observation of near degeneracy of scalar mesons above 1 GeV, namely, the mass of the strange-flavor scalar meson is similar to that of the non-strange one, is at variance with the naive expectation of the quark model. Qualitatively, the ... More
Invariant surface area functionals and singular Yamabe problem in 3-dimensional CR geometryNov 11 2017We express two CR invariant surface area elements in terms of quantities in pseudohermitian geometry. We deduce the Euler-Lagrange equations of the associated energy functionals. Many solutions are given and discussed. In relation to the singular CR Yamabe ... More
Double-semion topological order from exactly solvable quantum dimer modelsJun 24 2014Oct 08 2015We construct a generalized quantum dimer model on two-dimensional nonbipartite lattices including the triangular lattice, the star lattice and the kagome lattice. At the Rokhsar-Kivelson (RK) point, we obtain its exact ground states that are shown to ... More
Accelerating Mini-batch SARAH by Step Size RulesJun 20 2019StochAstic Recursive grAdient algoritHm (SARAH), originally proposed for convex optimization and also proven to be effective for general nonconvex optimization, has received great attention due to its simple recursive framework for updating stochastic ... More
Hawking Radiation of Vector Particles via Tunneling From 4-Dimensional And 5-Dimensional Black HolesAug 23 2016Sep 19 2016Using Proca equation and WKB approximation, we investigate Hawking radiation of vector particles via tunneling from 4-dimensional Kerr-de Sitter black hole and 5-dimensional Schwarzschild-Tangherlini black hole. The results show that the tunneling rates ... More
Real-time Topic-aware Influence Maximization Using PreprocessingMar 01 2014Nov 21 2014Influence maximization is the task of finding a set of seed nodes in a social network such that the influence spread of these seed nodes based on certain influence diffusion model is maximized. Topic-aware influence diffusion models have been recently ... More
Gauge Invariant and Infrared Finite Theory of Nonleptonic Heavy Meson DecaysFeb 03 1999May 27 1999We show that the controversies on the gauge dependence and the infrared singularity emerged in the generalized factorization approach for nonleptonic heavy meson decays within the framework of the operator product expansion can be resolved by perturbative ... More
ynogkm: A New Public Code For Calculating time-like Geodesics In The Kerr-Newmann SpacetimeNov 18 2013In this paper we present a new public code, named $ynogkm$, for the fast calculation of time-like geodesics in the Kerr-Newmann (K-N) spacetime, which is a direct extension of $ynogk$ calculating null geodesics in a Kerr spacetime. Following the strategies ... More
Creating Two-Dimensional Electron Gas in Nonpolar Oxide Interface via Polarization Discontinuity: First-Principles Analysis of CaZrO3/SrTiO3 HeterostructureAug 03 2015We studied strain-induced polarization and resulting conductivity in the nonpolar/nonpolar CaZrO3/SrTiO3 (CZO/STO) heterostructure (HS) system by means of first-principles electronic structure calculations. By modeling four types of CZO/STO HS-based slab ... More
A basis of Casimirs in 3D magnetohydrodynamicsJan 14 2019We prove that any regular Casimir in 3D magnetohydrodynamics is a function of the magnetic helicity and cross-helicity. In other words, these two helicities are the only independent regular integral invariants of the coadjoint action of the MHD group ... More
k-dependent SU(4) model of high-temperature superconductivity and its coherent-state solutionsMay 06 2007Oct 21 2008We extend the SU(4) model [1-5] for high-Tc superconductivity to an SU(4)k model that permits explicit momentum (k) dependence in predicted observables. We derive and solve gap equations that depend on k, temperature, and doping from the SU(4)k coherent ... More
Pairing Gaps, Pseudogaps, and Phase Diagrams for Cuprate SuperconductorsFeb 21 2007We use a symmetry-constrained variational procedure to construct a generalization of BCS to include Cooper pairs with non-zero momentum and angular momentum. The resulting gap equations are solved at zero and finite temperature, and the doping-dependent ... More
Mott Insulators, No-Double-Occupancy, and Non-Abelian SuperconductivitySep 09 2003SU(4) dynamical symmetry is shown to imply a no-double-occupancy constraint on the minimal symmetry description of antiferromagnetism and d-wave superconductivity. This implies a maximum doping fraction of 1/4 for cuprates and provides a microscopic critique ... More
Recursive Exponential Weighting for Online Non-convex OptimizationSep 13 2017In this paper, we investigate the online non-convex optimization problem which generalizes the classic {online convex optimization problem by relaxing the convexity assumption on the cost function. For this type of problem, the classic exponential weighting ... More
Masses of Scalar and Axial-Vector B Mesons RevisitedApr 04 2017Oct 08 2017The SU(3) quark model encounters a great challenge in describing even-parity mesons. Specifically, the $q\bar q$ quark model has difficulties in understanding the light scalar mesons below 1 GeV, scalar and axial-vector charmed mesons and $1^+$ charmonium-like ... More
Symmetry fractionalization of visons in $\mathbb Z_2$ spin liquidsSep 09 2015In this work we study symmetry fractionalization of vison excitations in topological $\mathbb{Z}_2$ spin liquids. We show that in the presence of the full $\mathrm{SO}(3)$ spin rotational symmetry and if there is an odd number of spin-$\frac12$ per unit ... More
Flexible Energy Management Protocol for Cooperative EV-to-EV ChargingFeb 16 2018In this paper, we investigate flexible power transfer among electric vehicles (EVs) from a cooperative perspective in an EV system. First, the concept of cooperative EV-to-EV (V2V) charging is introduced, which enables active cooperation via charging/discharging ... More
Decomposing Correlated Random Walks on Common and Counter MovementsAug 16 2018Random walk is one of the most classical and well-studied model in probability theory. For two correlated random walks on lattice, every step of the random walks has only two states, moving in the same direction or moving in the opposite direction. This ... More
Triple Attention Mixed Link Network for Single Image Super ResolutionOct 08 2018Single image super resolution is of great importance as a low-level computer vision task. Recent approaches with deep convolutional neural networks have achieved im-pressive performance. However, existing architectures have limitations due to the less ... More
An Evaluation of Design-based Properties of Different Composite EstimatorsNov 29 2018For the last decades, the US Census Bureau has been using the AK composite estimation method for generating employment level and rate estimates. In this paper, we devise an evaluation study to compare the AK estimator with different competitors using ... More
Dynamics of Self-retracting motion of graphite micro-flakesJul 12 2013A sheared microscopic graphite mesa retracts spontaneously to minimize interfacial energy. Using an optical knife-edge technique, we report comparative measurements of the speeds of such self-retracting motion (SRM) in air and low vacuum (about 1 Pa). ... More
Enabling Multiple Access for Non-Line-of-Sight Light-to-Camera CommunicationsFeb 27 2018Aug 01 2018Light-to-Camera Communications (LCC) have emerged as a new wireless communication technology with great potential to benefit a broad range of applications. However, the existing LCC systems either require cameras directly facing to the lights or can only ... More
Charmless hadronic B decays involving scalar mesons: Implications to the nature of light scalar mesonsAug 09 2005Dec 01 2005The hadronic charmless B decays into a scalar meson and a pseudoscalar meson are studied within the framework of QCD factorization. Although the light scalar mesons $f_0(980)$ and $a_0(980)$ are widely perceived as primarily the four-quark bound states, ... More
Neural Machine Translation with Pivot LanguagesNov 15 2016Feb 21 2017While recent neural machine translation approaches have delivered state-of-the-art performance for resource-rich language pairs, they suffer from the data scarcity problem for resource-scarce language pairs. Although this problem can be alleviated by ... More
Two-parton Light-cone Distribution Amplitudes of Tensor MesonsJul 20 2010We present a detailed study of the two-parton light-cone distribution amplitudes for $1\,^3P_2$ nonet tensor mesons. The asymptotic two-parton distribution amplitudes of twist-2 and twist-3 are given. The decay constants $f_T$ and $f_T^\bot$ defined by ... More
Bosonic SET to SPT Transition under Dyonic LSM TheoremOct 15 2018Nov 11 2018Employing large-scale quantum Monte Carlo simulatoins, we study the phase diagram of a quantum spin model which is subject to the recently developed dyonic Lieb-Shultz-Mattis (LSM) theorem. The theorem predicts there are symmetry enriched/protected topological ... More
Caution on emergent continuous symmetry: a Monte Carlo investigation of transverse-field frustrated Ising model on triangle and honeycomb latticesFeb 09 2016Jul 24 2017Continuous symmetries are believed to emerge at many quantum critical points in frustrated magnets. In this work, we study two candidates of this paradigm: the transverse-field frustrated Ising model (TFFIM) on the triangle and the honeycomb lattices. ... More
Charmless B decays to a scalar meson and a vector mesonMay 22 2007The hadronic charmless B decays into a scalar meson and a vector meson are studied within the framework of QCD factorization. The main results are: (i) The decay rates for the $f_0(980)K^{*-}$ and $f_0(980)\ov K^{*0}$ modes depend on the $f_0-\sigma$ ... More
Reliable Electrical Switching of Tri-State Antiferromagnetic Néel Order in $α$-Fe$_2$O$_3$ Epitaxial FilmsJun 11 2019The ability to manipulate antiferromagnetic (AF) moments is a key requirement for the emerging field of antiferromagnetic spintronics. Electrical switching of bi-state AF moments has been demonstrated in metallic AFs, CuMnAs and Mn$_2$Au. Recently, current-induced ... More