Results for "Kai-Yang Lin"

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Nonlinear Electromagnetic Quasinormal Modes and Hawking Radiation of A Regular Black Hole with Magnetic ChargeSep 21 2014Mar 24 2015Based on a regular exact black hole (BH) from nonlinear electrodynamics (NED) coupled to General Relativity, we investigate its stability of such BH through the Quasinormal Modes (QNMs) of electromagnetic (EM) field perturbation and its thermodynamics ... More
Fermions Tunneling from Higher-Dimensional Reissner-Nordström Black Hole: Semiclassical and Beyond Semiclassical ApproximationMar 11 2009Aug 25 2016Based on semiclassical tunneling method, we focus on charged fermions tunneling from higher-dimensional Reissner-Nordstr\"{o}m black hole. We first simplify the Dirac equation by semiclassical approximation, and then a semiclassical Hamilton-Jacobi equation ... More
Neural Networks in Hybrid Precoding for Millimeter Wave Massive MIMO SystemsMar 21 2019Neural networks have been applied to the physical layer of wireless communication systems to solve complex problems. In millimeter wave (mmWave) massive multiple-input multiple-output (MIMO) systems, hybrid precoding has been considered as an energy-efficient ... More
The second-order $L^2$-flow of inextensible elastic curves with hinged ends in the planeJan 14 2014In the paper published in Duke Math. J. 1993, Y. Wen studied a second-order parabolic equation for inextensible elastic \emph{closed} curves in $\mathbb{R}^{2}$ toward inextensible elasticae. In this article, we extend Wen's result to the case of open ... More
FusionStitching: Deep Fusion and Code Generation for Tensorflow Computations on GPUsNov 13 2018In recent years, there is a surge on machine learning applications in industry. Many of them are based on popular AI frameworks like Tensorflow, Torch, Caffe, or MxNet, etc, and are enpowered by accelerator platforms such as GPUs. One important challenge ... More
Lorentz Invariance Violation and Modified Hawking Fermions Tunneling from Black StringsFeb 13 2014Recently the modified Dirac equation with Lorentz invariance violation has been proposed, which would be helpful to resolve some issues in quantum gravity theory and high energy physics. In this paper, the modified Dirac equation has been generalized ... More
Half metallic and insulating phases in BN/Graphene lateral heterostructuresApr 04 2014We investigate theoretically the electronic structure of graphene and boron nitride (BN) lateral heterostructures, which were fabricated in recent experiments. The first-principles density functional calculation demonstrates that a huge intrinsic transverse ... More
Effects of Preheated Clusters on the CMB SpectrumOct 15 2002Nov 15 2002Mounting evidence from $x$-ray observations reveals that bound objects should receive some form of energy in the past injected from non-gravitaional sources. We report that an instantaneous heating scheme, for which gases in dense regions were subjected ... More
Bound States in Nanoscale Graphene Quantum Dots in a Continuous Graphene SheetFeb 10 2017Considerable efforts have been made to trap massless Dirac fermions in graphene monolayer, but only quasi-bound states are realized in continuous graphene sheets up to now. Here, we demonstrate the realization of bound states in nanoscale graphene quantum ... More
Non-barotropic linear Rossby wave instability in three-dimensional disksSep 03 2012Jan 09 2013Astrophysical disks with localized radial structure, such as protoplanetary disks containing dead zones or gaps due to disk-planet interaction, may be subject to the non-axisymmetric Rossby wave instability (RWI) that lead to vortex-formation. The linear ... More
Vortex and spiral instabilities at gap edges in three-dimensional self-gravitating disc-satellite simulationsMay 17 2012Aug 19 2012Numerical simulations of global three-dimensional (3D), self-gravitating discs with a gap opened by an embedded planet are presented. The simulations are customised to examine planetary gap stability. Previous results, obtained by Lin & Papaloizou from ... More
Energy Efficiency Optimization of Generalized Spatial Modulation with Sub-Connected Hybrid PrecodingJan 02 2019Energy efficiency (EE) optimization of millimeter wave (mm-Wave) massive multiple-input multiple-output (MIMO) systems is emerging as an important challenge for the fifth generation (5G) mobile communication systems. However, the power of radio frequency ... More
One-step synthesis of van der Waals heterostructures of graphene and 2D superconducting a-Mo2CMar 07 2017Assembling different two-dimensional (2D) crystals, covering a very broad range of properties, into van der Waals (vdW) heterostructures enables the unprecedented possibilities for combining the best of different ingredients in one objective material. ... More
Linear stability of magnetized massive protoplanetary disksApr 07 2014May 30 2014Magneto-rotational instability (MRI) and gravitational instability (GI) are the two principle routes to turbulent angular momentum transport in accretion disks. Protoplanetary disks may develop both. This paper aims to reinvigorate interest in the study ... More
Instabilities at planetary gap edges in 3D self-gravitating disksApr 29 2013Numerical simulations are presented to study the stability of gaps opened by giant planets in 3D self-gravitating disks. In weakly self-gravitating disks, a few vortices develop at the gap edge and merge on orbital time-scales. The result is one large ... More
Dust settling against hydrodynamic turbulence in protoplanetary discsMar 08 2019Enhancing the local dust-to-gas ratio in protoplanetary discs is a necessary first step to planetesimal formation. In laminar discs, dust settling is an efficient mechanism to raise the dust-to-gas ratio at the disc midplane. However, turbulence, if present, ... More
Rossby wave instability in locally isothermal and polytropic disks: three-dimensional linear calculationsMar 12 2012May 15 2012Numerical calculations of the linear Rossby wave instability (RWI) in global three-dimensional (3D) disks are presented. The linearized fluid equations are solved for vertically stratified, radially structured disks with either a locally isothermal or ... More
Dynamical instabilities in disc-planet interactionsMar 21 2012Protoplanetary discs may become dynamically unstable due to structure induced by an embedded giant planet. In this thesis, I discuss the stability of such systems and explore the consequence of instability on planetary migration. I begin with non-self-gravitating, ... 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
Effects of upper disc boundary conditions on the linear Rossby wave instabilityOct 24 2012The linear Rossby wave instability (RWI) in global, 3D polytropic discs is revisited with a much simpler numerical method than that previously employed by the author. The governing partial differential equation is solved with finite differences in the ... More
Simulation of a Combined SZE and Weak Lensing Cluster Survey for AMiBA ExperimentFeb 01 2004Oct 02 2005We present simulations of interferometric Sunyaev-Zel'dovich effect (SZE) and optical weak lenisng observations for the forthcoming AMiBA experiment, aiming at searching for high-redshift clusters of galaxies. On the basis of simulated sky maps, we have ... More
Holographic Superconductors in a Rotating SpacetimeMar 28 2014Oct 17 2014We consider holographic superconductors in a rotating black string spacetime. In view of the mandatory introduction of the $A_\varphi$ component of the vector potential we are left with three equations to be solved. Their solutions show that the effect ... More
One-armed spirals in locally isothermal, radially structured self-gravitating discsFeb 09 2015We describe a new mechanism that leads to the destabilisation of non-axisymmetric waves in astrophysical discs with an imposed radial temperature gradient. This might apply, for example, to the outer parts of protoplanetary discs. We use linear density ... More
Testing large-scale vortex formation against viscous layers in three-dimensional discsOct 04 2013Vortex formation through the Rossby wave instability (RWI) in protoplanetary discs has been invoked to play a role in planet formation theory, and suggested to explain the observation of large dust asymmetries in several transitional discs. However, whether ... More
A vision based system for underwater dockingDec 12 2017Autonomous underwater vehicles (AUVs) have been deployed for underwater exploration. However, its potential is confined by its limited on-board battery energy and data storage capacity. This problem has been addressed using docking systems by underwater ... More
Hadoop Perfect File: A fast access container for small files with direct in disc metadata accessMar 14 2019Apr 26 2019Storing and processing massive small files is one of the major challenges for the Hadoop Distributed File System (HDFS). In order to provide fast data access, the NameNode (NN) in HDFS maintains the metadata of all files in its main-memory. Hadoop performs ... More
Region Proposal by Guided AnchoringJan 10 2019Region anchors are the cornerstone of modern object detection techniques. State-of-the-art detectors mostly rely on a dense anchoring scheme, where anchors are sampled uniformly over the spatial domain with a predefined set of scales and aspect ratios. ... More
Region Proposal by Guided AnchoringJan 10 2019Apr 12 2019Region anchors are the cornerstone of modern object detection techniques. State-of-the-art detectors mostly rely on a dense anchoring scheme, where anchors are sampled uniformly over the spatial domain with a predefined set of scales and aspect ratios. ... More
Origin of large moments in Mn$_x$Si$_{1-x}$ at small xJun 18 2009Recently, the magnetic moment/Mn, $M$, in Mn$_x$Si$_{1-x}$ was measured to be 5.0 $\mu_B$/Mn, at $x$ =0.1%. To understand this observed $M$, we investigate several Mn$_x$Si$_{1-x}$ models of alloys using first-principles density functional methods. The ... More
Hidden quantum mirage by negative refraction in semiconductor P-N junctionsMar 10 2016We predict a novel quantum interference based on the negative refraction across a semiconductor P-N junction: with a local pump on one side of the junction, the response of a local probe on the other side behaves as if the disturbance emanates not from ... More
A self-contained algorithm for determination of solid-liquid equilibria in an alloy systemDec 04 2017We describe a self-contained procedure to evaluate the free energy of liquid and solid phases of an alloy system. The free energy of a single-element solid phase is calculated with thermodynamic integration using the Einstein crystal as the reference ... More
Effects of dopants on the glass forming ability in Al-based metallic alloyNov 07 2018Feb 15 2019The effect of dopants on the metallic glass forming ability is usually considered based on analysis of changes in the liquid structure or thermodynamics. What is missing in such considerations is an analysis of how a dopant changes the properties of the ... More
Nonlinear Rashba Model and Spin Relaxation in Quantum WellsSep 13 2006We find that the Rashba spin splitting is intrinsically a nonlinear function of the momentum, and the linear Rasha model may overestimate it significantly, especially in narrow-gap materials. A nonlinear Rashba model is proposed, which is in good agreement ... More
Space-Time Polar Coded ModulationDec 06 2013May 19 2014The polar codes are proven to be capacity-achieving and are shown to have equivalent or even better finite-length performance than the turbo/LDPC codes under some improved decoding algorithms over the additive white Gaussian noise (AWGN) channels. Polar ... More
Low-Complexity Sphere Decoding of Polar Codes based on Optimum Path MetricAug 13 2013Sphere decoding (SD) of polar codes is an efficient method to achieve the error performance of maximum likelihood (ML) decoding. But the complexity of the conventional sphere decoder is still high, where the candidates in a target sphere are enumerated ... More
Improved Successive Cancellation Decoding of Polar CodesAug 17 2012Jan 17 2013As improved versions of successive cancellation (SC) decoding algorithm, successive cancellation list (SCL) decoding and successive cancellation stack (SCS) decoding are used to improve the finite-length performance of polar codes. Unified descriptions ... More
Solving Power System Differential Algebraic Equations Using Differential TransformationMar 03 2019May 16 2019This paper proposes a novel non-iterative method to solve power system differential algebraic equations (DAEs) using the differential transformation, a mathematical tool that can obtain power series coefficients by transformation rules instead of calculating ... More
Power System Simulation Using the Differential Transformation MethodFeb 12 2018This paper proposes a new semi-analytical approach for online time-domain power system simulation. The approach applies the differential transformation method (DTM) to the power system differential equation model to offline derive a semi-analytical solution ... More
Polar Coded Modulation with Optimal Constellation LabelingJul 10 2013A practical $2^m$-ary polar coded modulation (PCM) scheme with optimal constellation labeling is proposed. To efficiently find the optimal labeling rule, the search space is reduced by exploiting the symmetry properties of the channels. Simulation results ... More
Well-posedness and Robust Preconditioners for the Discretized Fluid-Structure Interaction SystemsMar 01 2014Apr 24 2014In this paper we develop a family of preconditioners for the linear algebraic systems arising from the arbitrary Lagrangian-Eulerian discretization of some fluid-structure interaction models. After the time discretization, we formulate the fluid-structure ... More
Rashba spin splitting in biased semiconductor quantum wellsDec 07 2005Dec 08 2005Rashba spin splitting (RSS) in biased semiconductor quantum wells is investigated theoretically based on the eight-band envelope function model. We find that at large wave vectors, RSS is both nonmonotonic and anisotropic as a function of in-plane wave ... More
From Uniform Continuity to Absolute ContinuityNov 30 2010Dec 06 2010Absolute continuity implies uniform continuity, but generally not vice versa. In this short note, we present one sufficient condition for a uniformly continuous function to be absolutely continuous, which is the following theorem: For a uniformly continuous ... More
A Hybrid ARQ Scheme Based on Polar CodesJul 10 2013A hybrid automatic repeat request (HARQ) scheme based on a novel class of rate-compatible polar (\mbox{RCP}) codes are proposed. The RCP codes are constructed by performing punctures and repetitions on the conventional polar codes. Simulation results ... More
The effect of self-gravity on vortex instabilities in disc-planet interactionsMar 25 2011We study the effect of disc self-gravity on vortex-forming instabilities associated with gaps opened by a Saturn mass planet in a protoplanetary disc. It is shown analytically and confirmed through linear calculations that vortex modes with low azimuthal ... More
Gravitational instability of planetary gaps and its effect on orbital migrationJan 20 2014Gap formation by giant planets in self-gravitating disks may lead to a gravitational edge instability (GEI). We demonstrate this GEI with global 3D and 2D self-gravitating disk-planet simulations using the ZEUS, PLUTO and FARGO hydrodynamic codes. High ... More
A Metrix Method for Quasinormal Modes: Schwarzschild Black Holes in Asymptotically Flat and (Anti-) de Sitter SpacetimesOct 26 2016In this work, we study the quasinormal modes of Schwarzschild and Schwarzschild (Anti-) de Sitter black holes by a matrix method. The proposed method involves discretizing the master field equation and expressing it in form of a homogeneous system of ... More
On matrix method for black hole quasinormal modesFeb 22 2019Feb 27 2019In this paper, we provide a comprehensive survey of possible applications of the matrix method for black hole quasinormal modes. The proposed algorithm can generally be applied to various background metrics, and in particular, it accommodates for both ... More
A non grid-based interpolation scheme for the eigenvalue problemSep 08 2016We propose a non grid-based interpolation scheme based on the information from the data collected from the vicinity of the query point. As a non-grid-based interpolation, the data points can be distributed randomly in a small region, and the interpolation ... More
Gap formation and stability in non-isothermal protoplanetary discsJan 08 2015Mar 30 2015Several observations of transition discs show lopsided dust-distributions. A potential explanation is the formation of a large-scale vortex acting as a dust-trap at the edge of a gap opened by a giant planet. Numerical models of gap-edge vortices have ... More
Orbital migration of giant planets induced by gravitationally unstable gaps: the effect of planet massJun 11 2013It has been suggested that long-period giant planets, such as HD 95086b and HR 8799bcde, may have formed through gravitational instability of protoplanetary discs. However, self-gravitating disc-satellite interaction can lead to the formation of a gravitationally ... More
On the evolution of vortices in massive protoplanetary discsMay 15 2018It is expected that a pressure bump can be formed at the inner edge of a dead-zone, and where vortices can develop through the Rossby Wave Instability (RWI). It has been suggested that self-gravity can significantly affect the evolution of such vortices. ... More
Steady state of dust distributions in disk vortices: Observational predictions and applications to transitional disksJul 14 2013Jul 17 2013The Atacama Large Millimeter Array (ALMA) has been returning images of transitional disks in which large asymmetries are seen in the distribution of mm-sized dust in the outer disk. The explanation in vogue borrows from the vortex literature by suggesting ... More
Edge modes in self-gravitating disc-planet interactionsMar 25 2011We study the stability of gaps opened by a giant planet in a self-gravitating protoplanetary disc. We find a linear instability associated with both the self-gravity of the disc and local vortensity maxima which coincide with gap edges. For our models, ... More
Elliptic preconditioner for accelerating the self consistent field iteration in Kohn-Sham density functional theoryJun 11 2012May 09 2013We discuss techniques for accelerating the self consistent field (SCF) iteration for solving the Kohn-Sham equations. These techniques are all based on constructing approximations to the inverse of the Jacobian associated with a fixed point map satisfied ... More
A Matrix Method for Quasinormal Modes: Schwarzschild Black Holes in Asymptotically Flat and (Anti-) de Sitter SpacetimesOct 26 2016Apr 01 2017In this work, we study the quasinormal modes of Schwarzschild and Schwarzschild (Anti-) de Sitter black holes by a matrix method. The proposed method involves discretizing the master field equation and expressing it in form of a homogeneous system of ... More
Neutral regular black hole solution in Rastall gravityDec 25 2018In this work, we investigate the static, spherically symmetric black hole solutions in a generalized Rastall gravity. In particular, the regular black hole solution is uncharged. The properties of the regular black hole solutions are discussed. Moreover, ... More
Vortex survival in 3D self-gravitating accretion discsMay 15 2018Large-scale, dust-trapping vortices may account for observations of asymmetric protoplanetary discs. Disc vortices are also potential sites for accelerated planetesimal formation by concentrating dust grains. However, in 3D discs vortices are subject ... More
Outward migration of a giant planet with a gravitationally unstable gap edgeDec 07 2011We present numerical simulations of disc-planet interactions where the planet opens a gravitationally unstable gap in an otherwise gravitationally stable disc. In our disc models, where the outer gap edge can be unstable to global spiral modes, we find ... More
Characterising motion types of G-band bright points in the quiet SunJul 30 2014We study the motions of G band bright points (GBPs) in the quiet Sun to obtain the characteristics of different motion types. A high resolution image sequence taken with the Hinode/Solar Optical Telescope (SOT) is used, and GBPs are automatically tracked ... More
Learning of Content Knowledge and Development of Scientific Reasoning Ability: A Cross Culture ComparisonJul 13 2008Student content knowledge and general reasoning abilities are two important areas in education practice and research. However, there hasn't been much work in physics education that clearly documents the possible interactions between content learning and ... More
Crystallographic dependent transport properties and oxygen issue in superconducting LiTi2O4 thin filmsAug 24 2016A systematic study is performed on the spinel oxide, i.e. LiTi2O4 thin films oriented along [111]-, [110]-, and [001]-directions, to reveal the crystallographic dependence of transport properties. With decreasing temperature, the LiTi2O4 displays roughly ... More
Evidence of electron-electron interactions around Van Hove singularities of a graphene Moiré superlatticeFeb 12 2017May 10 2017A variety of new and interesting correlated states have been predicted in graphene monolayer doped to Van Hove singularities (VHSs) of its density-of-state (DOS). However, tuning the Fermi energy to reach a VHS of graphene by either gating or chemical ... More
Polar Coded HARQ Scheme with Chase CombiningOct 24 2013Jan 10 2014A hybrid automatic repeat request scheme with Chase combing (HARQ-CC) of polar codes is proposed. The existing analysis tools of the underlying rate-compatible punctured polar (RCPP) codes for additive white Gaussian noise (AWGN) channels are extended ... More
Quantifying the Topology and Evolution of a Magnetic Flux Rope Associated with Multi-flare ActivitiesApr 26 2016Magnetic flux rope (MFR) plays an important role in solar activities. A quantitative assessment of the topology of an MFR and its evolution is crucial for a better understanding of the relationship between the MFR and the associated activities. In this ... More
Additive-Decomposition-Based Output Feedback Tracking Control for Systems with Measurable Nonlinearities and Unknown DisturbancesSep 21 2011Jan 05 2012In this paper, a new control scheme, called as additive-decomposition-based tracking control, is proposed to solve the output feedback tracking problem for a class of systems with measurable nonlinearities and unknown disturbances. By the additive decomposition, ... More
Dusty disc-planet interaction with dust-free simulationsMay 02 2018Protoplanets may be born into dust-rich environments if planetesimals formed through streaming or gravitational instabilities, or if the protoplanetary disc is undergoing mass loss due to disc winds or photoevaporation. Motivated by this possibility, ... More
Millimeter Wave Communications for Future Mobile NetworksMay 17 2017Millimeter wave (mmWave) communications have recently attracted large research interest, since the huge available bandwidth can potentially lead to rates of multiple Gbps (gigabit per second) per user. Though mmWave can be readily used in stationary scenarios ... More
Answering Analytical Queries on Text Data with Temporal Term HistogramsSep 28 2018Oct 15 2018Temporal text, i.e., time-stamped text data are found abundantly in a variety of data sources like newspapers, blogs and social media posts. While today's data management systems provide facilities for searching full-text data, they do not provide any ... More
Holographic phase transition and Quasinormal modes in Lovelock gravitySep 14 2014Jan 23 2015In this work we aim at discussing the effects of higher order corrections to curvature on the Lovelock AdS black holes quasinormal spectrum and, in the context of gauge/gravity correspondence, their consequences for the formation of holographic superconductors. ... 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
Higher dimensional power-Maxwell charged black holes in Einstein and Rastall gravitySep 26 2018May 05 2019The black hole solutions in higher-dimensional spacetimes with the presence of the power-Maxwell field, surrounded by quintessence, are investigated for Einstein as well as Rastall gravity. The obtained solutions accommodate for spherical, planar and ... More
Cooling Requirements for the Vertical Shear Instability in Protoplanetary DisksMay 08 2015Jul 14 2015The vertical shear instability (VSI) offers a potential hydrodynamic mechanism for angular momentum transport in protoplanetary disks (PPDs). The VSI is driven by a weak vertical gradient in the disk's orbital motion, but must overcome vertical buoyancy, ... More
Type III migration in a low viscosity discFeb 19 2010We study the type III migration of a Saturn mass planet in low viscosity discs. The planet is found to experience cyclic episodes of rapid decay in orbital radius, each amounting to a few Hill radii. We find this to be due to the scattering of large- ... 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
Output Feedback Tracking Control for a Class of Uncertain Systems subject to Unmodeled Dynamics and Delay at InputNov 01 2011Jan 25 2012Besides parametric uncertainties and disturbances, the unmodeled dynamics and time delay at the input are often present in practical systems, which cannot be ignored in some cases. This paper aims to solve output feedback tracking control problem for ... 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
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
A thermodynamic view of dusty protoplanetary disksAug 09 2017Oct 10 2017Small solids embedded in gaseous protoplanetary disks are subject to strong dust-gas friction. Consequently, tightly-coupled dust particles almost follow the gas flow. This near conservation of dust-to-gas ratio along streamlines is analogous to the near ... More
On the gravitational stability of gravito-turbulent accretion disksMar 04 2016Apr 06 2016Low mass, self-gravitating accretion disks admit quasi-steady,`gravito-turbulent' states in which cooling balances turbulent viscous heating. However, numerical simulations show that gravito-turbulence cannot be sustained beyond dynamical timescales when ... More
Bolocam Observations of Two Unconfirmed Galaxy Cluster Candidates from the Planck Early SZ SampleDec 21 2011Mar 15 2012We present Bolocam observations of two galaxy cluster candidates reported as unconfirmed in the Planck early Sunyaev-Zel'dovich (eSZ) sample, PLCKESZ G115.71+17.52 and PLCKESZ G189.84-37.24. We observed each of these candidates with Bolocam at 140 GHz ... More
Dirac quasinormal modes in spherically symmetric regular black holesAug 29 2013Oct 10 2013Using the WKB approximation, massless and massive Dirac quasinormal modes (QNMs) are studied in spherically symmetric regular spacetimes. We analyze the relationships between QNM frequencies and the parameters (angular momentum number $l$, magnetic monopole ... 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
Vertical shear instability in the solar nebulaMar 04 2016We quantify the thermodynamic requirement for the Vertical Shear Instability and evaluate its relevance to realistic protoplanetary disks as a potential route to hydrodynamic turbulence.
On the Sample Complexity of PAC Learning Quantum ProcessOct 25 2018We generalize the PAC (probably approximately correct) learning model to the quantum world by generalizing the concepts from classical functions to quantum processes, defining the problem of \emph{PAC learning quantum process}, and study its sample complexity. ... More
Almost Homogeneous Poisson SpacesJul 10 2003We prove that any holomorphic Poisson manifold has an open symplectic leaf which is a pseudo-K\"ahler submanifold, and we define an obstruction to study the equivariance of momentum map for tangential Poisson action. Some properties of almost homogeneous ... More
Equivariant formality of transversely symplectic foliations and Frobenius manifoldsSep 03 2016Aug 13 2018Consider the Hamiltonian action of a compact connected Lie group on a transversely symplectic foliation which satisfies the transverse hard Lefschetz property. We establish an equivariant formality theorem and an equivariant symplectic $d\delta$-lemma ... More
An Interpolation Theorem for Sublinear Operators on Non-homogeneous Metric Measure SpacesJan 30 2012Let $({\mathcal X}, d, \mu)$ be a metric measure space and satisfy the so-called upper doubling condition and the geometrically doubling condition. In this paper, the authors establish an interpolation result that a sublinear operator which is bounded ... More
The optical absorption spectra of V centers in deformed MgO under pressureMar 15 2017The electronic structure and optical absorption spectrum of V^{0} and V^{-} center in MgO are investigated using first-principles calculations based on density functional theory. It is demonstrated that the configuration with distortion is energetically ... More
Post-Keplerian motion in Reissner-Nordström spacetimeFeb 27 2019We present the analytical post-Newtonian solutions for the test particle's motion in the Reissner-Nordstr\"{o}m spacetime. The solutions are formulated in the Wagoner-Will representation, the Epstein-Haugan representation, the Brumberg representation, ... More
Blow-up dynamics in the mass super-critical NLS equationsNov 02 2018Mar 05 2019We study stable blow-up dynamics in the $L^2$-supercritical nonlinear Schr\"{o}dinger equation in various dimensions. We first investigate the profile equation and extend the result of X.-P. Wang [38] and Budd et al. [4] on the existence and local uniqueness ... More
Spin states in InAs/AlSb/GaSb semiconductor quantum wellsDec 30 2008Nov 04 2009We investigate theoretically the spin states in InAs/AlSb/GaSb broken-gap quantum wells by solving the Kane model and the Poisson equation self-consistently. The spin states in InAs/AlSb/GaSb quantum wells are quite different from those obtained by the ... More
A fast clustering algorithm for mining social network dataMar 05 2014Aug 29 2014Many groups with diverse convictions are interacting online. Interactions in online communities help people to engage each other and enhance understanding across groups. Online communities include multiple sub-communities whose members are similar due ... More
An analytics approach to designing patient centered medical homesFeb 26 2014Recently the patient-centered medical home (PCMH) model has become a popular team-based approach focused on delivering more streamlined care to patients. In current practices of medical homes, a clinical-based prediction frame is recommended because it ... More
Vanishing Theorems on Compact Hyperkähler ManifoldsOct 13 2010We prove that if $B$ is a $k$-positive holomorphic line bundle on a compact hyperk\"ahler manifold $M,$ then $H^p (M,\Omega^q\otimes B)=0$ for $p>n+[\frac{k}{2}]$ and any nonnegative integer $q.$ In a special case $k=0$ and $q=0$ we recover a vanishing ... More
RSG: Beating Subgradient Method without Smoothness and Strong ConvexityDec 09 2015Nov 12 2018In this paper, we study the efficiency of a {\bf R}estarted {\bf S}ub{\bf G}radient (RSG) method that periodically restarts the standard subgradient method (SG). We show that, when applied to a broad class of convex optimization problems, RSG method can ... More
Spaces of Type BLO on Non-homogeneous Metric Measure SpacesSep 04 2010Dec 17 2010Let $({\mathcal X}, d, \mu)$ be a metric measure space and satisfy the so-called upper doubling condition and the geometrically doubling condition. In this paper, the authors introduce the space ${\mathop\mathrm{RBLO}}(\mu)$ and prove that it is a subset ... More
Generative Imaging and Image Processing via Generative EncoderMay 23 2019This paper introduces a novel generative encoder (GE) model for generative imaging and image processing with applications in compressed sensing and imaging, image compression, denoising, inpainting, deblurring, and super-resolution. The GE model consists ... More
Robust Hashing for Multi-View Data: Jointly Learning Low-Rank Kernelized Similarity Consensus and Hash FunctionsNov 17 2016Learning hash functions/codes for similarity search over multi-view data is attracting increasing attention, where similar hash codes are assigned to the data objects characterizing consistently neighborhood relationship across views. Traditional methods ... More
Quotients of one-sided trianglated categories by rigid subcategories as module categoriesFeb 08 2013We prove that some subquotient categories of one-sided triangulated categories are abelian. This unifies a result by Iyama-Yoshino in the case of triangulated categories and a result by Demonet-Liu in the case of exact categories.
Generalized effective-potential Landau theory for the two-dimensional extended Bose-Hubbard modelOct 24 2018We analytically study the quantum phase diagrams of ultracold dipolar Bose gases in an optical square lattice at zero temperature by using the generalized effective-potential Landau theory (GEPLT). For a weak nearest-neighbor repulsion, our analytical ... More