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Results for "Chao Zhang"

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On algebras of strongly derived unbounded typeJan 13 2015Let $A$ be a finite-dimensional algebra over an algebraically closed field. We prove $A$ is a strongly derived unbounded algebra if and only if there exists an integer $m$, such that $C_m(\proj A)$, the category of all minimal projective complexes with ... More
Truxen: A Trusted Computing Enhanced BlockchainApr 17 2019Truxen is a Trusted Computing enhanced blockchain that uses Proof of Integrity protocol as the consensus. Proof of Integrity protocol is derived from Trusted Computing and associated Remote Attestations, that can be used to vouch a node's identity and ... More
Renormalized solutions for the fractional p(x)-Laplacian equation with L^1 dataAug 15 2017In this paper, we prove the existence and uniqueness of nonnegative renormalized solutions for the fractional p(x)-Laplacian problem with L1 data. Our results are new even in the constant exponent fractional p-Laplacian equation case.
Computing the dielectric constant of liquid water at constant dielectric displacementOct 02 2015Apr 06 2016The static dielectric constant of liquid water is computed using classical force field based molecular dynamics simulation at fixed electric displacement D. The method to constrain the electric displacement is the finite temperature classical variant ... More
Application BMO type space to parabolic equations of Navier-Stokes type with the Neumann boundary conditionMar 13 2018Mar 15 2018Let $L$ be a Neumann operator of the form $L=-\Delta_{N}$ acting on $L^2(\mathbb R^n)$. Let ${BMO}_{\Delta_{N}}(\mathbb R^n)$ denote the BMO space on $\mathbb R^n$ associated to the Neumann operator $\L$. In this article we will show that a function $f\in ... More
Maximum Orders of Cyclic and Abelian Extendable Actions on SurfacesOct 28 2013Sep 27 2015Let $\Sigma_g (g>1)$ be a closed surface embedded in $S^3$. If a group $G$ can acts on the pair $(S^3, \Sigma_g)$, then we call such a group action on $\Sigma_g$ extendable over $S^3$. In this paper we show that the maximum order of extendable cyclic ... More
Brauer-Thrall type theorems for derived module categoriesOct 10 2013May 16 2017The numerical invariants (global) cohomological length, (global) cohomological width, and (global) cohomological range of complexes (algebras) are introduced. Cohomological range leads to the concepts of derived bounded algebras and strongly derived unbounded ... More
Boundedness of variation operators associated with the heat semigroup generated by high order Schrödinger type operatorsFeb 01 2019In this paper, we derive the $L^p$-boundedness of the variation operators associated with the heat semigroup which is generated by the high order Schr\"odinger type operator $(-\Delta)^2+V^2$. Further more, we prove the boundedness of the variation operators ... More
Stratifications in good reductions of Shimura varieties of abelian typeJul 03 2017Feb 07 2018In this paper we study the geometry of good reductions of Shimura varieties of abelian type. More precisely, we construct the Newton stratification, Ekedahl-Oort stratification, and central leaves on the special fiber of a Shimura variety of abelian type ... More
Characterization of temperatures associated to Schrödinger operators with initial data in Morrey spacesDec 10 2017Nov 16 2018Let $\mathcal{L}$ be a Schr\"odinger operator of the form $\mathcal{L} = -\Delta+V$ acting on $L^2(\mathbb R^n)$ where the nonnegative potential $V$ belongs to the reverse H\"older class $B_q$ for some $q\geq n.$ Let $L^{p,\lambda}(\mathbb{R}^{n})$, $0\le ... More
More counterexamples to Happel's question and Snashall-Solberg's conjectureSep 19 2011In this paper we provide more counterexamples to Happel's question and Snashall-Solberg's conjecture which generalize many counterexamples to these conjectures studied in the literature. In particular, we show that a family of $\mathbb{Z}_n\times \mathbb{Z}_n$-Galois ... More
Introduction and reconciliation of the ROS and aging paradoxesOct 28 2017This paper suggests that aging is influenced synthetically by pro-aging factors such as ROS and anti-aging factors such as protective responses. The anti-aging effect may be side effects of retrograde responses motivated against adverse circumstances. ... More
Analysis of Dual-Hop AF Relay Systems in Mixed RF and FSO LinksNov 27 2017We analysis the performances for the dual-hop fixed gain amplify-and-forward (AF) relay systems operating over mixed radio-frequency (RF) and free-space optical (FSO) links. The RF link is subject to Rician fading and the FSO link experiences Gamma-Gamma ... More
Atom-dimer scattering in heteronuclear mixture with finite intra-species scattering lengthJan 15 2018We study the three-body problem of two ultracold identical bosonic atoms (denoted by $B$) and one extra atom (denoted by $X$), where the scattering length $a_{BX}$ between each bosonic atom and atom $X$ is resonantly large and positive. We calculate the ... More
Entry-exit decisions with implementation delay under uncertaintyMar 04 2015Nov 30 2015We employ a natural method from the perspective of the optimal stopping theory to analyze entry-exit decisions with implementation delay of a project, and provide closed expressions for optimal entry decision times, optimal exit decision times and the ... More
Superconductivity driven by pairing of the coherent parts of the physical electronsMar 12 2016Dec 15 2017How the superconductivity in unconventional superconductors emerges from the diverse mother normal states is still a big puzzle. Whatever the mother normal states are the superconductivity is {\em normal} with BCS-like behaviours of the paired quasiparticles ... More
Alternating Heegaard diagrams and Williams solenoid attractors in 3--manifoldsFeb 03 2015We find all Heegaard diagrams with the property "alternating" or "weakly alternating" on a genus two orientable closed surface. Using these diagrams we give infinitely many genus two 3--manifolds, each admits an automorphism whose non-wondering set consists ... More
Superconductivity driven by pairing of the coherent parts of the physical electronsMar 12 2016How the superconductivity in unconventional superconductors emerges from the diverse mother normal states is still a big puzzle. Whatever the mother normal state is the superconductivity is {\em normal} with BCS-like behaviours of the paired quasiparticles ... More
One-loop renormalization group equations of the neutrino mass matrix in the triplet seesaw modelNov 27 2006Jan 25 2007Within the framework of the standard model plus one heavy Higgs triplet, we derive a full set of one-loop renormalization group equations of the neutrino mass matrix and Higgs couplings in both full and effective theories. The explicit RGEs of neutrino ... More
Characterization of temperatures associated to Schrodinger operators with initial data in BMO spacesOct 02 2017Jan 07 2018Let L be a Schr\"odinger operator of the form L=-\Delta+V acting on L^2(\mathbb R^n) where the nonnegative potential V belongs to the reverse H\"older class B_q for some q>= n. Let BMO denote the BMO space associated to the Schr\"odinger operator L. In ... More
Optimal stopping problems with regime switching: a viscosity solution methodApr 13 2014Dec 24 2015We employ the viscosity solution technique to analyze optimal stopping problems with regime switching. Specifically, we obtain the viscosity property of value functions, the uniqueness of viscosity solutions, the regularity of value functions and the ... More
Two ultracold atoms in a completely anisotropic trapMar 10 2008As a limiting case of ultracold atoms trapped in deep optical lattices, we consider two interacting atoms trapped in a general anisotropic harmonic oscillator potential, and obtain exact solutions of the Schrodinger equation for this system. The energy ... More
Long time well-posdness of the Prandtl equations in Sobolev spaceNov 16 2015May 09 2016In this paper, we study the long time well-posedness for the nonlinear Prandtl boundary layer equation on the half plane. While the initial data are small perturbations of some monotonic shear profile, we prove the existence, uniqueness and stability ... More
A Counterexample for the Validity of Using Nuclear Norm as a Convex Surrogate of RankApr 23 2013Jul 01 2013Rank minimization has attracted a lot of attention due to its robustness in data recovery. To overcome the computational difficulty, rank is often replaced with nuclear norm. For several rank minimization problems, such a replacement has been theoretically ... More
Completing Low-Rank Matrices with Corrupted Samples from Few Coefficients in General BasisJun 25 2015May 23 2016Subspace recovery from corrupted and missing data is crucial for various applications in signal processing and information theory. To complete missing values and detect column corruptions, existing robust Matrix Completion (MC) methods mostly concentrate ... More
Neutrino Oscillation Studies with ReactorsMar 03 2015Apr 27 2015Nuclear reactors are one of the most intense, pure, controllable, cost-effective, and well-understood sources of neutrinos. Reactors have played a major role in the study of neutrino oscillations, a phenomenon that indicates that neutrinos have mass and ... More
Topological magnetic crystalline insulators and co-representation theoryJan 27 2014Gapless surface states of time reversal invariant topological insulators are protected by the anti-unitary nature of the time reversal operation. Very recently, this idea was generalized to magnetic structures, in which time reversal symmetry is explicitly ... More
Topological invariants for three dimensional Dirac semimetals and four dimensional topological rotational insulatorsMay 14 2016Dirac semimetal is a class of semi-metallic phase protected by certain types of crystalline symmetries, and its low-energy effective Hamiltonian is described by Dirac equations in three dimensions (3D). Despite of various theoretical studies, theories ... More
Learning to Detect Instantaneous Changes with Retrospective Convolution and Static Sample SynthesisNov 20 2018Change detection has been a challenging visual task due to the dynamic nature of real-world scenes. Good performance of existing methods depends largely on prior background images or a long-term observation. These methods, however, suffer severe degradation ... More
A Parallel Way to Select the Parameters of SVM Based on the Ant Optimization AlgorithmMay 19 2014May 20 2014A large number of experimental data shows that Support Vector Machine (SVM) algorithm has obvious advantages in text classification, handwriting recognition, image classification, bioinformatics, and some other fields. To some degree, the optimization ... More
Poynting vector, energy density and energy velocity in anomalous dispersion mediumApr 02 2001The Poynting vector, energy density and energy velocity of light pulses propagating in anomalous dispersion medium (used in WKD-like experiments) are calculated. Results show that a negative energy density in the medium propagates along opposite of incident ... More
On characterization of Poisson integrals of Schrodinger operators with BMO tracesJun 03 2013Sep 22 2013Let L be a Schrodinger operator of the form L=-\Delta+V acting on L^2(Rn) where the nonnegative potential V belongs to the reverse Holder class Bq for some q>= n. Let BMO_L(Rn) denote the BMO space on Rn associated to the Schrodinger operator L. In this ... More
Weighted inequlities for a generalized dyadic maximal operator involving the infinite productApr 27 2014We define a generalized dyadic maximal operator involving the infinite product and discuss weighted inequalities for the operator. A formulation of the Carleson embedding theorem is proved. Our results depend heavily on a generalized H\"{o}lder's inequalities. ... More
Renormalized and entropy solutions for the fractional p-Laplacian parabolic equation with L^1 dataAug 16 2017In this paper we introduce a natural function class and prove the existence and uniqueness of both nonnegative renormalized solutions and entropy solutions for the fractional p-Laplacian parabolic problem with L^1 data. And moreover, we obtain the equivalence ... More
Thermal Relaxation Time in Chemically Non-equilibrated Quark- Gluon PlasmaJul 09 1997The definition of thermal relaxation time is extended to chemically non-equilibrated quark-gluon plasma and the chemical non-equilibrated thermal relaxation times for partons are calculated using the non-equilibrium Debye mass as the infrared regulator. ... More
Identification and Analysis of Cascading Failures in Power Grids with Protective ActionsMar 29 2019This paper aims to identify and analyze the initial contingencies or disturbances that could lead to the worst-case cascading failures of power grids. An optimal control approach is proposed to determine the most disruptive disturbances on the branch ... More
Blur-Countering Keypoint Detection via Eigenvalue AsymmetrySep 05 2018Well-known corner or local extrema feature based detectors such as FAST and DoG have achieved noticeable successes. However, detecting keypoints in the presence of blur has remained to be an unresolved issue. As a matter of fact, various kinds of blur ... More
Majorana Dark matter with B+L gauge symmetryApr 06 2016Apr 12 2016We present a new model that extends the Standard Model (SM) with the local B+L symmetry, and point out that the lightest new fermion $\zeta$, introduced to cancel anomalies and stabilized automatically by the B+L symmetry, can serve as the cold dark matter ... More
Orientation dependence of the optical spectra in graphene at high frequenciesSep 24 2007Sep 25 2007On the basis of the Kubo formula we evaluated the optical conductivity of a graphene sheet. The full behavior of frequency as well as temperature dependence of the optical conductivity is presented. We show that the anisotropy of conductivity can be significantly ... More
On Estimation of Isotonic Piecewise Constant SignalsMay 18 2017Jul 15 2018Consider a sequence of real data points $X_1,\ldots, X_n$ with underlying means $\theta^*_1,\dots,\theta^*_n$. This paper starts from studying the setting that $\theta^*_i$ is both piecewise constant and monotone as a function of the index $i$. For this, ... More
Crystalline Symmetry-Protected Majorana Mode in Number-Conserving Dirac Semimetal NanowiresAug 04 2017Apr 16 2018One of the cornerstones for topological quantum computations is the Majorana zero mode, which has been intensively searched in fractional quantum Hall systems and topological superconductors. Several recent works suggest that such an exotic mode can also ... More
Fingerprints of bosonic symmetry protected topological state in a quantum point contactOct 05 2016Jul 07 2017In this work, we study the transport through a quantum point contact for bosonic helical liquid that exists at the edge of a bilayer graphene under a strong magnetic field. We identify "smoking gun" transport signatures to distinguish bosonic symmetry ... More
Collaborative Learning with Limited Interaction: Tight Bounds for Distributed Exploration in Multi-Armed BanditsApr 05 2019Best arm identification (or, pure exploration) in multi-armed bandits is a fundamental problem in machine learning. In this paper we study the distributed version of this problem where we have multiple agents, and they want to learn the best arm collaboratively. ... More
The piston effect induced by mass transfer in a binary fluid mixture near the critical pointAug 04 2018Nov 29 2018Similar to pure fluids, physical properties of a binary fluid mixture also exhibit singularities close to its critical point, especially when it is dilute. The numerical and theoretical results presented in this paper identify that the piston effect, ... More
Influence of orbital nematic order on spin responses in Fe-based superconductorsNov 30 2014Apr 26 2016Electronic nematicity is ubiquitous in Fe-based superconductors, but what the primary nematic order is and how the various nematic phenomena correlate with each other are still elusive. In this manuscript we study the physical consequence of the orbital ... More
A Characterization of BMO^α-martingale spaces by fractional Carleson measuresApr 30 2014May 09 2014We give a characterization of $BMO^\alpha$-martingale spaces by using fractional Carleson measures. We get the boudedness of martingale transform and square function on $BMO^\alpha$-martingale spaces easily by using this characterization. We also proved ... More
Prototype VOEvent Network Systems based on VTP and XMPP for the SVOM Chinese Science CenterOct 14 2016We present the current progress of design and build of two prototype VOEvent network systems for the SVOM Chinese Science Center. One is based on VTP which is compatible with the global VOEvent network, the other is based on XMPP which enables cross-platform ... More
Blocks with defect group $\mathbb Z_{2^n}\times \mathbb Z_{2^n}\times \mathbb Z_{2^m}$Mar 20 2018Jun 26 2018In this paper, we prove that a block with defect group $\mathbb Z_{2^n}\times \mathbb Z_{2^n}\times \mathbb Z_{2^m}$, where $n\geq 2$ and $m$ is arbitrary, is Morita equivalent to its Brauer correspondent.
Global linear convergent algorithm to compute the minimum volume enclosing ellipsoidFeb 21 2017Apr 02 2018The minimum volume enclosing ellipsoid (MVEE) problem is an optimization problem in the basis of many practical problems. This paper describes some new properties of this model and proposes a first-order oracle algorithm, the Adjusted Coordinate Descent ... More
1/f Noise and Long Configuration Memory in Bak-Tang-Wiesenfeld Models on Narrow StripesFeb 04 1999We report our findings of an 1/f power spectrum for the total amount of sand in directed and undirected Bak-Tang-Wiesenfeld models confined on narrow stripes and driven locally. The underlying mechanism for the 1/f noise in these systems is an exponentially ... More
Binary output layer of feedforward neural networks for solving multi-class classification problemsJan 22 2018Considered in this short note is the design of output layer nodes of feedforward neural networks for solving multi-class classification problems with r (bigger than or equal to 3) classes of samples. The common and conventional setting of output layer, ... More
Task Oriented Channel State Information QuantizationApr 02 2019In this paper, we propose a new perspective for quantizing a signal and more specifically the channel state information (CSI). The proposed point of view is fully relevant for a receiver which has to send a quantized version of the channel state to the ... More
Learning Deep Generative Models with Doubly Stochastic MCMCJun 15 2015Mar 07 2016We present doubly stochastic gradient MCMC, a simple and generic method for (approximate) Bayesian inference of deep generative models (DGMs) in a collapsed continuous parameter space. At each MCMC sampling step, the algorithm randomly draws a mini-batch ... More
Theory for superconductivity in alkali chromium arsenides A2Cr3As3 (A=K,Rb,Cs)Feb 13 2015Feb 10 2017We propose an extended Hubbard model with three molecular orbitals on a hexagonal lattice with $D_{3h}$ symmetry to study recently discovered superconductivity in A$_2$Cr$_3$As$_3$ (A=K,Rb,Cs). Effective pairing interactions from paramagnon fluctuations ... More
Training Dependency Parsers with Partial AnnotationSep 29 2016Recently, these has been a surge on studying how to obtain partially annotated data for model supervision. However, there still lacks a systematic study on how to train statistical models with partial annotation (PA). Taking dependency parsing as our ... More
First-principles study of the incorporation and diffusion of helium in cubic zirconiaDec 01 2010The incorporation and diffusion of helium (He) with and without intrinsic vacancy defects in cubic ZrO$_{2}$ are investigated through first-principles total-energy calculations, in which the projector-augmented-wave (PAW) method with the generalized gradient ... More
FrameRank: A Text Processing Approach to Video SummarizationApr 11 2019Apr 12 2019Video summarization has been extensively studied in the past decades. However, user-generated video summarization is much less explored since there lack large-scale video datasets within which human-generated video summaries are unambiguously defined ... More
First-principles study of ground state properties of zirconium dihydrideJul 30 2010Structural, mechanical, electronic, and thermodynamic properties of fluorite and tetragonal phases of ZrH$_{2}$ are systematically studied by employing the density functional theory within generalized gradient approximation. The existence of the bistable ... More
FrameRank: A Text Processing Approach to Video SummarizationApr 11 2019Video summarization has been extensively studied in the past decades. However, user-generated video summarization is much less explored since there lack large-scale video datasets within which human-generated video summaries are unambiguously defined ... More
Stability of Metallic Structure in Compressed Solid GeH4Apr 30 2008We study the electronic and lattice dynamical properties of compressed solid germane in the pressure range up to 200 GPa with density functional theory. A stable metallic structure, Aba2, with a base-centered orthorhombic symmetry was found to be the ... More
Effect of Si on Fe-rich intermetallic formation and mechanical properties of heattreated Al-Cu-Mn-Fe alloysDec 26 2017The effect of Si on Fe-rich intermetallics formation and mechanical properties of heat-treated squeeze cast Al-5.0Cu-0.6Mn-0.7Fe alloy was investigated. Our results show that increasing Si content promotes the formation of Al15(FeMn)3(SiCu)2 (${\alpha}$-Fe), ... More
Relations among Some Low Rank Subspace Recovery ModelsDec 06 2014Recovering intrinsic low dimensional subspaces from data distributed on them is a key preprocessing step to many applications. In recent years, there has been a lot of work that models subspace recovery as low rank minimization problems. We find that ... More
Indecomposables with smaller cohomological length in the derived category of gentle algebrasSep 15 2016Bongartz and Ringel proved that there is no gaps in the sequence of lengths of indecomposable modules for the finite-dimensional algebras over algebraically closed fields. The present paper mainly study this "no gaps" theorem for the bounded derived module ... More
Point-surface fusion of station measurements and satellite observations for mapping PM2.5 distribution in China: methods and assessmentJul 05 2016Fine particulate matter (PM2.5) is associated with adverse human health effects, and China is currently suffering from serious PM2.5 pollution. To obtain spatially continuous ground-level PM2.5 concentrations, several models established by point-surface ... More
Proposal for High-harmonic EEHG Lasing at Shanghai Deep Ultra-Violet Free-electron LaserJul 08 2013The echo-enabled harmonic generation (EEHG) free-electron laser (FEL) has been already demonstrated at lower harmonics and the first lasing at third harmonic also has been achieved at Shanghai deep ultra-violet FEL (SDUV-FEL). While the great advantage ... More
Word Segmentation on Micro-blog Texts with External Lexicon and Heterogeneous DataAug 04 2016Sep 29 2016This paper describes our system designed for the NLPCC 2016 shared task on word segmentation on micro-blog texts.
Origin of Scaling Behavior of Protein Packing Density: A Sequential Monte Carlo Study of Compact Long Chain PolymersJan 08 2003Single domain proteins are thought to be tightly packed. The introduction of voids by mutations is often regarded as destabilizing. In this study we show that packing density for single domain proteins decreases with chain length. We find that the radius ... More
Delay-Constrained Rate Control for Real-Time Video Streaming with Bounded Neural NetworkMay 02 2018Rate control is widely adopted during video streaming to provide both high video qualities and low latency under various network conditions. However, despite that many work have been proposed, they fail to tackle one major problem: previous methods determine ... More
GaitSet: Regarding Gait as a Set for Cross-View Gait RecognitionNov 15 2018Dec 12 2018As a unique biometric feature that can be recognized at a distance, gait has broad applications in crime prevention, forensic identification and social security. To portray a gait, existing gait recognition methods utilize either a gait template, where ... More
Universal Dynamics of a Degenerate Bose Gas Quenched to UnitarityDec 17 2018Motivated by an unexpected experimental observation from the Cambridge group, [Eigen {\it et al.,} Nature {\bf563}, 221 (2018)], we study the evolution of the momentum distribution of a degenerate Bose gas quenched from the weakly interacting to the unitarity ... More
Counting hypergraph colorings in the local lemma regimeNov 09 2017Nov 12 2017We give a fully polynomial-time approximation scheme (FPTAS) to count the number of $q$-colorings for $k$-uniform hypergraphs with maximum degree $\Delta$ if $k\ge 28$ and $q > 315\Delta^{\frac{14}{k-14}}$. We also obtain a polynomial-time almost uniform ... More
Easing Embedding Learning by Comprehensive Transcription of Heterogeneous Information NetworksJul 10 2018Heterogeneous information networks (HINs) are ubiquitous in real-world applications. In the meantime, network embedding has emerged as a convenient tool to mine and learn from networked data. As a result, it is of interest to develop HIN embedding methods. ... More
Community Detection in Degree-Corrected Block ModelsJul 24 2016Community detection is a central problem of network data analysis. Given a network, the goal of community detection is to partition the network nodes into a small number of clusters, which could often help reveal interesting structures. The present paper ... More
Joint Sub-bands Learning with Clique Structures for Wavelet Domain Super-ResolutionSep 12 2018Oct 25 2018Convolutional neural networks (CNNs) have recently achieved great success in single-image super-resolution (SISR). However, these methods tend to produce over-smoothed outputs and miss some textural details. To solve these problems, we propose the Super-Resolution ... More
Holographic Thermal Relaxation in Superfluid TurbulenceDec 29 2014Dec 08 2015Holographic duality provides a first-principles approach to investigate real time processes in quantum many-body systems, in particular at finite temperature and far-from-equilibrium. We use this approach to study the dynamical evolution of vortex number ... More
Learning Implicit Generative Models by Teaching Explicit OnesJul 10 2018Jan 29 2019Implicit generative models are difficult to train as no explicit density functions are defined. Generative adversarial nets (GANs) present a minimax framework to train such models, which however can suffer from mode collapse due to the nature of the JS-divergence. ... More
Low-loss Airy Surface Plasmon PolaritonsMar 31 2018We propose a scheme to obtain a low-loss propagation of Airy surface plasmon polaritons (SPPs) along the interface between a dielectric and a negative-index metamaterial (NIMM). We show that, by using the transverse-magnetic mode and the related destructive ... More
Graphs in the 3--sphere with maximum symmetryOct 03 2015Oct 24 2017We consider the orientation-preserving actions of finite groups $G$ on pairs $(S^3, \Gamma)$, where $\Gamma$ is a connected graph of genus $g>1$, embedded in $S^3$. For each $g$ we give the maximum order $m_g$ of such $G$ acting on $(S^3, \Gamma)$ for ... More
The effect of heavy metal in CMOS on neutron induced single event upset simulated with Geant4May 05 2015Local metal interconnection is widely used in modern complementary metal oxide semiconductor (CMOS) technology. The most frequently used local materials are some heavy metals, such as tungsten (W) or copper (Cu). It's well known that single event upset ... More
Word Segmentation on Micro-blog Texts with External Lexicon and Heterogeneous DataAug 04 2016This paper describes our system designed for the NLPCC 2016 shared task on word segmentation on micro-blog texts.
Attribute-Aware Attention Model for Fine-grained Representation LearningJan 02 2019How to learn a discriminative fine-grained representation is a key point in many computer vision applications, such as person re-identification, fine-grained classification, fine-grained image retrieval, etc. Most of the previous methods focus on learning ... More
Onset of double-diffusive convection in near-critical gas mixturesNov 29 2018Mar 23 2019Near the thermodynamic critical point, the physical properties of binary fluids exhibit large variations in response to small temperature and concentration differences, whose effects on the onset of double-diffusive convection are reported here. The vertical ... More
Modave Lectures on Applied AdS/CFT with NumericsJan 03 2016Jan 06 2016These lecture notes are intended to serve as an introduction to applied AdS/CFT with numerics for an audience of graduate students and others with little background in the subject. The presentation begins with a poor man's review of current status of ... More
A Probabilistic Bitwise Genetic Algorithm for B-Spline based Image Deformation EstimationMar 26 2019We propose a novel genetic algorithm to solve the image deformation estimation problem by preserving the genetic diversity. As a classical problem, there is always a trade-off between the complexity of deformation models and the difficulty of parameters ... More
Bordered surfaces in the 3-sphere with maximum symmetryOct 24 2017We consider orientation-preserving actions of finite groups $G$ on pairs $(S^3, \Sigma)$, where $\Sigma$ denotes a compact connected surface embedded in $S^3$. In a previous paper, we considered the case of closed, necessarily orientable surfaces, determined ... More
Optimal Dividend Payments for the Piecewise-Deterministic Poisson Risk ModelJun 14 2011Nov 20 2014This paper considers the optimal dividend payment problem in piecewise-deterministic compound Poisson risk models. The objective is to maximize the expected discounted dividend payout up to the time of ruin. We provide a comparative study in this general ... More
The Effects of Vacancy and Oxidation on Black Phosphorus NanoresonatorsNov 30 2016Black phosphorene is not stable at ambient conditions, so atomic defects and oxidation effects are unavoidable in black phosphorus samples in the experiment. The effects of these defects on the performance of the black phosphorus nanoresonators are still ... More
Single-shot thermal ghost imaging using wavelength-division multiplexingAug 07 2017Apr 11 2018Ghost imaging (GI) is a potential imaging technique that reconstructs the target scene from its correlated measurements with a sequential of patterns. Restricted by the multi-shot principle, GI usually requires long acquisition time and is limited in ... More
QCD corrections to $\bm{e^+ e^- \to J/ψg g}$ at B FactoriesDec 30 2008Apr 24 2009In heavy quarkonium production, the measured ratio $R_{c \bar c}=\sigma[J/\psi+ c\bar c + X]/\sigma[J/\psi +X]$ at B factories is much larger than existing theoretical predictions. To clarify this discrepancy, in nonrelativistic QCD (NRQCD) we find the ... More
Factorization and NLO QCD correction in e^+ e^- \to J/ψ(ψ(2S))+ χ_{c0} at B Factories}Feb 25 2008Sep 09 2008In nonrelativistic QCD (NRQCD), we study $e^+ e^- \to J/\psi(\psi(2S)) +\chi_{c0}$ at $B$ factories, where the P-wave state $\chi_{c0}$ is associated with an S-wave state $J/\psi$ or $\psi(2S)$. In contrast to the failure of factorization in most cases ... More
Coherence effects on pion spectrum distributionJun 10 1997The effects of two kinds of coherent lengths, the wave packet length of the emitter and the radius of the coherent source, on pion spectrum distribution are studied. It is shown that both coherent lengths can cause abundant pions at low momentum, but ... More
Compatibility of certain integral models of Shimura varieties of abelian typeMar 18 2019For a prime $p>2$, Kisin and Pappas constructed parahoric integral models at $p$ for Shimura varieties attached to Shimura data $(G,X)$ of abelian type such that $G$ splits over a tamely ramified extension of $\mathbb{Q}_p$. A certain auxiliary data has ... More
Ekedahl-Oort strata for good reductions of Shimura varieties of Hodge typeDec 17 2013Jul 04 2017For a Shimura variety of Hodge type with hyperspecial level structure at a prime $p$, Vasiu and Kisin constructed a smooth integral model (namely the integral canonical model) uniquely determined by a certain extension property. We define and study the ... More
Note on Zero Temperature Holographic SuperfluidsFeb 11 2016In this note, we have addressed various issues on zero temperature holographic superfluids. First, inspired by our numerical evidence for the equality between the superfluid density and particle density, we provide an elegant analytic proof for this equality ... More
Cosmological constraints on $Λ(α)$CDM models with time-varying fine structure constantSep 12 2018We study the $\Lambda(\alpha)$CDM models with $\Lambda(\alpha)$ being a function of the time-varying fine structure constant $\alpha$. We give a close look at the constraints on two specific $\Lambda(\alpha)$CDM models with one and two model parameters, ... More
Embedding periodic maps on surfaces into those on $S^3$Feb 05 2013Call a periodic map $h$ on the closed orientable surface $\Sigma_g$ extendable if $h$ extends to a periodic map over the pair $(S^3, \Sigma_g)$ for possible embeddings $e: \Sigma_g\to S^3$. We determine the extendabilities for all periodical maps on $\Sigma_2$. ... More
Fully coherent hard X-ray generation by two-stage of Phase-merging Enhanced Harmonic GenerationFeb 23 2016Cascading stages of seeded free electron laser (FEL) is a promising way to produce fully coherent X-ray radiations. We study a new approach to produce coherent hard X-rays by cascading the recently proposed phase-merging enhanced harmonic generation (PEHG). ... More
3D spherical-cap fitting procedure for (truncated) sessile nano- and micro-droplets & -bubblesJun 05 2017In the study of nanobubbles, nanodroplets or nanolenses immobilised on a substrate, a cross-section of a spherical-cap is widely applied to extract geometrical information from atomic force microscopy (AFM) topographic images. In this paper, we have developed ... More
Achieving Optimal Misclassification Proportion in Stochastic Block ModelMay 14 2015Oct 03 2015Community detection is a fundamental statistical problem in network data analysis. Many algorithms have been proposed to tackle this problem. Most of these algorithms are not guaranteed to achieve the statistical optimality of the problem, while procedures ... More
Cosmological Solutions with Torsion in a Model of de Sitter Gauge Theory of GravityJan 07 2008The torsion is shown to be vitally important in the explanation of the evolution of the universe in a large class of gravitational theories containing quadratic terms of curvature and torsion. The cosmological solutions with homogeneous and isotropic ... More