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Results for "Cong Li"

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Discussion on Benford's Law and its ApplicationAug 04 2004Oct 04 2004The probability that a number in many naturally occurring tables of numerical data has first significant digit $d$ is predicted by Benford's Law ${\rm Prob} (d) = \log_{10} (1 + {\displaystyle{1\over d}}), d = 1, 2 >..., 9$. Illustrations of Benford's ... More
An Enhanced Deep Feature Representation for Person Re-identificationApr 26 2016Apr 28 2016Feature representation and metric learning are two critical components in person re-identification models. In this paper, we focus on the feature representation and claim that hand-crafted histogram features can be complementary to Convolutional Neural ... More
Effective quantum state reconstruction using compressive sensing in NMR quantum computingJun 15 2017The number of measurements required to reconstruct the states of quantum systems increases exponentially with the quantum system dimensions, which makes the state reconstruction of high-qubit quantum systems have a great challenge in physical quantum ... More
$\mathcal{R}^2$-CNN: Fast Tiny Object Detection in Large-scale Remote Sensing ImagesFeb 16 2019Recently, convolutional neural network has brought impressive improvements for object detection. However, detecting tiny objects in large-scale remote sensing images still remains challenging. Firstly, the extreme large input size makes existing object ... More
Computed Tomography Image Enhancement using 3D Convolutional Neural NetworkJul 18 2018Computed tomography (CT) is increasingly being used for cancer screening, such as early detection of lung cancer. However, CT studies have varying pixel spacing due to differences in acquisition parameters. Thick slice CTs have lower resolution, hindering ... More
Reduced-Rank Local Distance Metric Learning for k-NN ClassificationFeb 21 2019We propose a new method for local distance metric learning based on sample similarity as side information. These local metrics, which utilize conical combinations of metric weight matrices, are learned from the pooled spatial characteristics of the data, ... More
OpenRISC System-on-Chip Design EmulationFeb 09 2016Recently the hardware emulation technique has emerged as a promising approach to accelerating hardware verification/debugging process. To fully evaluate the powerfulness of the emulation approach and demonstrate its potential impact, we propose to emulate ... More
Deformed Legendre Polynomial and Its ApplicationDec 03 2002A new kind of deformed calculus was introduced recently in studying of parabosonic coordinate representation. Based on this deformed calculus, a new deformation of Legendre polynomials is proposed in this paper, some properties and applications of which ... More
Non-Markovianity-assisted high-fidelity Deutsch-Jozsa algorithm in diamondJan 23 2018The memory effects in non-Markovian quantum dynamics can induce the revival of quantum coherence, which is believed to provide important physical resources for quantum information processing (QIP). However, no real quantum algorithms have been demonstrated ... More
A Stronger Multi-observable Uncertainty RelationJan 04 2017May 24 2017Uncertainty relation lies at the heart of quantum mechanics, characterizing the incompatibility of non-commuting observables in the preparation of quantum states. An important question is how to improve the lower bound of uncertainty relation. Here we ... More
Experimental investigation of the uncertainty relations with coherent lightMar 05 2019Taking advantage of coherent light polarizations, we experimentally investigate the variance-based uncertainty relations and the optimal universal uncertainty relation. Different from measuring the individual quanta in most of the experiments, we examine ... More
The evolution of universe in the two-scalar theoryJul 25 2018We generalize f(R,T) gravity into the two-scalar theory that includes two independent scalar fields by the variational method, and we derive its field equations in Einstein frame using conformal transformation. Based on Friedmann equations and Raychaudhuri ... More
State of the Art and Prospects of Structured Sensing Matrices in Compressed SensingAug 07 2014Compressed sensing (CS) enables people to acquire the compressed measurements directly and recover sparse or compressible signals faithfully even when the sampling rate is much lower than the Nyquist rate. However, the pure random sensing matrices usually ... More
DeepBillboard: Systematic Physical-World Testing of Autonomous Driving SystemsDec 27 2018Deep Neural Networks (DNNs) have been widely applied in many autonomous systems such as autonomous driving. Recently, DNN testing has been intensively studied to automatically generate adversarial examples, which inject small-magnitude perturbations into ... More
CT Image Reconstruction in a Low Dimensional ManifoldApr 16 2017Regularization methods are commonly used in X-ray CT image reconstruction. Different regularization methods reflect the characterization of different prior knowledge of images. In a recent work, a new regularization method called a low-dimensional manifold ... More
Tunneling induced transparency and controllable group velocity in triple and multiple quantum-dot moleculesOct 17 2013We analyze the interaction of a triple quantum dot molecules controlled by the tunneling coupling instead of coupling laser. A general analytic expression for the steady-state linear susceptibility for a probe-laser field is obtained and we show that ... More
SmoothOut: Smoothing Out Sharp Minima to Improve Generalization in Deep LearningMay 21 2018Dec 02 2018In Deep Learning, Stochastic Gradient Descent (SGD) is usually selected as a training method because of its efficiency; however, recently, a problem in SGD gains research interest: sharp minima in Deep Neural Networks (DNNs) have poor generalization; ... More
Nonaxisymmetric Rossby Vortex Instability with Toroidal Magnetic Fields in Radially Structured DisksJun 29 2009We investigate the global nonaxisymmetric Rossby vortex instability in a differentially rotating, compressible magnetized accretion disk with radial density structures. Equilibrium magnetic fields are assumed to have only the toroidal component. Using ... More
HI Observations of Major-Merger Pairs at z = 0: atomic gas and star formationApr 10 2018Apr 11 2018We present a study of the HI gas content of a large K-band selected sample of 88 close major-merger pairs of galaxies (H-KPAIR) which were observed by $\it Herschel$. We obtained the 21 cm HI fine-structure emission line data for a total of 70 pairs from ... More
A Penalized Multi-trait Mixed Model for Association Mapping in Pedigree-based GWASMay 19 2013In genome-wide association studies (GWAS), penalization is an important approach for identifying genetic markers associated with trait while mixed model is successful in accounting for a complicated dependence structure among samples. Therefore, penalized ... More
Coordinating Filters for Faster Deep Neural NetworksMar 28 2017Jul 25 2017Very large-scale Deep Neural Networks (DNNs) have achieved remarkable successes in a large variety of computer vision tasks. However, the high computation intensity of DNNs makes it challenging to deploy these models on resource-limited systems. Some ... More
On Wilson's Theorem and Polignac ConjectureAug 02 2004We introduce Wilson's theorem and Clement's result and present a necessary and sufficient condition for p and p+2k to be primes where k is a positive integer. By using Simiov's Theorem, we derive an improved version of Clement's result and characterizations ... More
An Efficient Randomized Algorithm for Rumor Blocking in Online Social NetworksJan 09 2017Nov 08 2017Social networks allow rapid spread of ideas and innovations while the negative information can also propagate widely. When the cascades with different opinions reaching the same user, the cascade arriving first is the most likely to be taken by the user. ... More
On-line Quantum State Estimation Using Continuous Weak Measurement and Compressed SensingAug 30 2018We propose a new protocol for on-line quantum system estimation on the basis of continuous weak-measurements with the help of compressive sensing and the optimization algorithm. By directly measuring the state of the probe system, we indirectly obtain ... More
Local Gyrokinetic Study of Electrostatic Microinstabilities in Dipole PlasmasOct 31 2017Dec 19 2017A linear gyrokinetic particle-in-cell scheme, which is valid for arbitrary perpendicular wavelength $k_\perp\rho_i$ and includes the parallel dynamic along the field line, is developed to study the local electrostatic drift modes in point and ring dipole ... More
Local Luminosity Function at 15$μm$ and Galaxy Evolution Seen by ISOCAM 15$μm$ SurveysApr 15 2000A local luminosity function at 15$\mu m$ is derived using the bivariate (15$\mu m$ vs. 60$\mu m$ luminosity) method, based on the newly published ISOCAM LW3-band (15$\mu m$) survey of the very deep IRAS 60$\mu m$ sample in the north ecliptic pole region ... More
A Robust Compressive Quantum State Tomography Algorithm Using ADMMJan 25 2014The possible state space dimension increases exponentially with respect to the number of qubits. This feature makes the quantum state tomography expensive and impractical for identifying the state of merely several qubits. The recent developed approach, ... More
TernGrad: Ternary Gradients to Reduce Communication in Distributed Deep LearningMay 22 2017Dec 29 2017High network communication cost for synchronizing gradients and parameters is the well-known bottleneck of distributed training. In this work, we propose TernGrad that uses ternary gradients to accelerate distributed deep learning in data parallelism. ... More
Experimental evidence of optical analogue of electromagnetically induced transparency in grapheneApr 07 2016We demonstrate the first experimental observation of coherent population oscillation, an optical analogue of electromagnetically induced transparency, in graphene based on phase sensitive pump-probe system. Degenerate four-wave-mixing between pump and ... More
On the Homology of the Space of Curves Immersed in The Sphere with Curvature Constrained to a Prescribed IntervalSep 14 2018While the topology of the space of all smooth immersed curves on the $2$-sphere $\mathbb{S}^2$ that start and end at given points in given directions is well known, it is an open problem to understand the homotopy type of its subspaces consisting of the ... More
Experimental investigation of multi-observable uncertainty relationsJul 19 2017Dec 22 2017The uncertainty relation is a distinguishing feature of quantum theory, characterizing the incompatibility of noncommuting observables in the preparation of quantum states. Recently, many uncertainty relations were proposed with improved lower bounds ... More
Novel methods for measuring the optical parameters of the water Cherenkov detectorJan 11 2018In this paper, novel methods are presented to measure the optical properties of muon detectors (MDs) in the Large High-Altitude Air Shower Observatory (LHAASO), which can also be used by other experiments. Each MD consists of a cylindrical water Cherenkov ... More
Nonmagnetic ordering state of single-crystal SrTm$_2$O$_4$: A polarized and unpolarized neutron-scattering studyMar 31 2014Our single-crystal polarized neutron scattering at 65 mK and powder unpolarized neutron diffraction at 0.5 K show no evidence for a long-range magnetic order and even detect no sign of diffuse magnetic neutron scattering in single-crystal SrTm2O4. The ... More
Magnetization, crystal structure and anisotropic thermal expansion of single-crystal SrEr2O4Oct 24 2014The magnetization, crystal structure, and thermal expansion of a nearly stoichiometric Sr$_{1.04(3)}$Er$_{2.09(6)}$O$_{4.00(1)}$ single crystal have been studied by PPMS measurements and in-house and high-resolution synchrotron X-ray powder diffraction. ... More
The Feasibility of Testing LHVTs in Charm FactoryAug 07 2006Sep 28 2006It is commonly believed that the LHVTs can be tested through measuring the Bell's inequalities. This scheme, for the massive particle system, was originally set up for the entangled K^0\bar{K^0} pair system from the \phi factory. In this Letter we show ... More
Testing Local Realism in $P \to VV$ DecaysMar 06 2009Apr 07 2010It was found that the vector meson pair from the pseudoscalar decays can form an entangled state. In this work we give out detailed explanations on the polarization correlation of the two entangled vector mesons. It is demonstrated that an experimental ... More
Facelet-Bank for Fast Portrait ManipulationMar 15 2018Mar 30 2018Digital face manipulation has become a popular and fascinating way to touch images with the prevalence of smartphones and social networks. With a wide variety of user preferences, facial expressions, and accessories, a general and flexible model is necessary ... More
Color Recognition for Rubik's Cube RobotJan 11 2019In this paper, we proposed three methods to solve color recognition of Rubik's cube, which includes one offline method and two online methods. Scatter balance \& extreme learning machine (SB-ELM), a offline method, is proposed to illustrate the efficiency ... More
Classification of the Entangled States $2 \times M \times N$Dec 31 2009We extend the matrix decomposition method(MDM) in classifying the $2\times N\times N$ truly entangled states to $2\times M\times N$ system under the condition of stochastic local operations and classical communication(SLOCC). It is found that the MDM ... More
New Possibilities for Testing Local Realism in High Energy PhysicsDec 04 2008Dec 13 2009The three photons from the dominant ortho-positronium decay and two vector mesons from the $\eta_c$ exclusive decays are found to be in tripartite and high-dimensional entangled states, respectively. These two classes of entangled states possess the Hardy ... More
S-type Negative Differential Resistance in Semiconducting Transition-Metal DichalcogenidesJan 22 2019Current-controlled (also known as "S-type") negative differential resistance (NDR) is of crucial importance to many emerging applications including neuromorphic computing and high-density memristors integration. However, the experimental realization of ... More
Mini-Orange Spectrometer at CIAEJan 06 2016A Mini-Orange spectrometer used for in-beam measurements of internal conversion electrons, which consists of a Si(Li) detector and different sets of SmO$_5$ permanent magnets for filtering and transporting the conversion electrons to the Si(Li) detector, ... More
Quantum Entanglement of Neutrino PairsAug 02 2007Feb 19 2014It is practically shown that a pair of neutrinos from tau decay can form a flavor entangled state. With this kind of state we show that the locality constrains imposed by Bell inequality are violated by the quantum mechanics, and an experimental test ... More
Tailoring exciton dynamics by elastic strain-gradient in semiconductorsJul 09 2013As device miniaturization approaches the atomic limit, it becomes highly desirable to exploit novel paradigms for tailoring electronic structures and carrier dynamics in materials. Elastic strain can in principle be applied to achieve reversible and fast ... More
Electronic structure and nematic phase transition in superconducting multi-layer FeSe films grown by pulsed laser deposition methodJun 19 2017We report comprehensive angle-resolved photoemission investigations on the electronic structure of single crystal multiple-layer FeSe films grown on CaF2 substrate by pulsed laser deposition (PLD) method. Measurements on FeSe/CaF2 samples with different ... More
Evidence of a spin resonance mode in the iron-based superconductor Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ from scanning tunneling spectroscopyMay 02 2012We used high-resolution scanning tunneling spectroscopy to study the hole-doped iron pnictide superconductor Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ ($T_c=38$ K). Features of a bosonic excitation (mode) are observed in the measured quasiparticle density of ... More
Realization of Zero-Refractive-Index Lens with Ultralow Spherical AberrationOct 18 2016Optical complex materials offer unprecedented opportunity to engineer fundamental band dispersion which enables novel optoelectronic functionality and devices. Exploration of photonic Dirac cone at the center of momentum space has inspired an exceptional ... More
Equivalence theorem of uncertainty relationsDec 09 2015May 04 2016We present an equivalence theorem to unify the two classes of uncertainty relations, i.e., the variance based ones and the entropic forms, which shows that the entropy of an operator in a quantum system can be built from the variances of a set of commutative ... More
Reformulating the Quantum Uncertainty RelationFeb 23 2015Sep 17 2015Uncertainty principle is one of the cornerstones of quantum theory. In the literature, there are two types of uncertainty relations, the operator form concerning the variances of physical observables and the entropy form related to entropic quantities. ... More
Study on temperature coefficient of CdTe detector used for X-rays detectionNov 21 2016The temperature of the working environment is a key factor in determining the properties of semiconductor detectors, and it affects the absolute accuracy and stability of the standard detector. In order to determine the temperature coefficient of CdTe ... More
Operational necessary and sufficient criterion for the separability of mixed statesJul 12 2016Entanglement and the associated nonlocal phenomena are distinguishing features of quantum mechanics and have applications in almost all branches of quantum information science. Though being intensively studied for decades, it is still a challenge task ... More
Classification of Arbitrary Multipartite Entangled States under Local Unitary EquivalenceNov 18 2011Feb 28 2013We propose a practical method for finding the canonical forms of arbitrary dimensional multipartite entangled states, either pure or mixed. By extending the technique developed in one of our recent works, the canonical forms for the mixed $N$-partite ... More
Generation of Einstein-Podolsky-Rosen State via Earth's Gravitational FieldAug 22 2012Jun 06 2013Although various physical systems have been explored to produce entangled states involving electromagnetic, strong, and weak interactions, the gravity has not yet been touched in practical entanglement generation. Here, we propose an experimentally feasible ... More
A study of raining influence on the environmental radiation background spectra with HXMT/HENov 25 2016Full functional and performance tests were performed many times before the Hard X-ray Modulation Telescope (HXMT) launch. During one of the tests, the count rate curves of the 18 High Energy Detectors (HED) have been found increased consistently within ... More
Fourth-order split monopole perturbation solutions to the Blandford-Znajek mechanismMar 17 2015The Blandford-Znajek (BZ) mechanism describes a physical process for the energy extraction from a spinning black hole (BH), which is believed to power a great variety of astrophysical sources, such as active galactic nuclei (AGNs) and Gamma ray bursts ... More
Extended Dijkstra algorithm and Moore-Bellman-Ford algorithmAug 14 2017Study the general single-source shortest path problem. Firstly, define a path function on a set of some path with same source on a graph, and develop a kind of general single-source shortest path problem (GSSSP) on the defined path function. Secondly, ... More
An Elementary Proof for the Structure of Wasserstein DerivativesMay 23 2017May 28 2018Let $F: \mathbb{L}^2(\Omega, \mathbb{R}) \to \mathbb{R}$ be a law invariant and continuously Fr\'echet differentiable mapping. Based on Lions \cite{Lions}, Cardaliaguet \cite{Cardaliaguet} (Theorem 6.2 and 6.5) proved that: \bea \label{Derivative} D F ... More
On Crowdsourced Interactive Live Streaming: A Twitch.TV-Based Measurement StudyFeb 16 2015Feb 23 2015Empowered by today's rich tools for media generation and collaborative production, the multimedia service paradigm is shifting from the conventional single source, to multi-source, to many sources, and now toward {\em crowdsource}. Such crowdsourced live ... More
Rossby Wave Instability in Accretion Discs with Large-Scale Poloidal Magnetic FieldsDec 06 2012We study the effect of large-scale magnetic fields on the non-axisymmetric Rossby wave instability (RWI) in accretion discs. The instability develops around a density bump, which is likely present in the transition region between the active zone and dead ... More
High Resolution IRAS Maps and IR Emission of M31 --- II. Diffuse Component and Interstellar DustJul 23 1995Large-scale dust heating and cooling in the diffuse medium of M31 is studied using the HiRes IRAS maps in conjunction with UV, optical (UBV) and the HI maps. A dust heating/cooling model is developed based on a radiative transfer model which assumes a ... More
High Resolution IRAS Maps and IR Emission of M31 --- I. Morphology and SourcesJul 23 1995The morphology of the IR emission and the properties of discrete FIR sources in M31 disk are studied using the HiRes maps from IRAS. Very thin and bright FIR arm segments are shown in these maps, which have similar structure as the HI gas but with much ... More
Low complexity sum rate maximization for single and multiple stream MIMO AF relay networksNov 26 2012A multiple-antenna amplify-and-forward two-hop interference network with multiple links and multiple relays is considered. We optimize transmit precoders, receive decoders and relay AF matrices to maximize the achievable sum rate. Under per user and total ... More
Stickiness of KAM tori for higher dimensional beam equationJan 12 2015This paper is concerned with the stickiness of invariant tori obtained by KAM technics (so-called KAM tori) for higher dimensional beam equation. We prove that the KAM tori are sticky, i.e. the solutions starting in the $\delta$-neighborhood of KAM torus ... More
Analytic properties of force-free jets in the Kerr spacetime- IApr 19 2015Sep 09 2015Blandford-Znajek (BZ) mechanism describes a process extracting rotation energy from a spinning black hole (BH) via magnetic field lines penetrating the event horizon of central BH. In this paper, we present a perturbation approach to study force-free ... More
Highly-collimated, magnetically-dominated jets around rotating black holesJun 19 2014May 02 2015In this paper, we propose a general method for perturtative solutions to Blandford-Znajek mechanism. Instead of solving the nonlinear Grad-Shafranov equation directly, we introduce an alternative way to determine relevant physical quantities based on ... More
Inertial-Acoustic Oscillations of Black-Hole Accretion Discs with Large-Scale Poloidal Magnetic FieldsJan 23 2015Apr 09 2015We study the effect of large-scale magnetic fields on the non-axisymmetric inertial-acoustic modes (also called p-modes) trapped in the innermost regions of accretion discs around black holes (BHs). These global modes could provide an explanation for ... More
Rigorous Error Bounds for Ewald Summation of Electrostatics at Planar InterfacesSep 15 2014We present a rigorous Ewald summation formula to evaluate the electrostatic interactions in two-dimensionally periodic planar interfaces of three-dimensional systems. By rewriting the Fourier part of the summation formula of the original Ewald2D expression ... More
A Low-Delay Low-Complexity EKF Design for Joint Channel and CFO Estimation in Multi-User Cognitive CommunicationsNov 16 2011Parameter estimation in cognitive communications can be formulated as a multi-user estimation problem, which is solvable under maximum likelihood solution but involves high computational complexity. This paper presents a time-sharing and interference ... More
Quantum Discriminant Analysis for Dimensionality Reduction and ClassificationOct 01 2015Jul 08 2016We present quantum algorithms to efficiently perform discriminant analysis for dimensionality reduction and classification over an exponentially large input data set. Compared with the best-known classical algorithms, the quantum algorithms show an exponential ... More
Efficient Integer Coefficient Search for Compute-and-ForwardSep 18 2016Integer coefficient selection is an important decoding step in the implementation of compute-and-forward (C-F) relaying scheme. Choosing the optimal integer coefficients in C-F has been shown to be a shortest vector problem (SVP) which is known to be ... More
Total Domination Value in GraphsApr 18 2012A set $D \subseteq V(G)$ is a \emph{total dominating set} of $G$ if for every vertex $v \in V(G)$ there exists a vertex $u \in D$ such that $u$ and $v$ are adjacent. A total dominating set of $G$ of minimum cardinality is called a $\gamma_t(G)$-set. For ... More
Pareto-Path Multi-Task Multiple Kernel LearningApr 11 2014A traditional and intuitively appealing Multi-Task Multiple Kernel Learning (MT-MKL) method is to optimize the sum (thus, the average) of objective functions with (partially) shared kernel function, which allows information sharing amongst tasks. We point ... More
Orthogonal symmetric Toeplitz matrices for compressed sensing: Statistical isometry propertyDec 29 2010Oct 24 2012Recently, the statistical restricted isometry property (RIP) has been formulated to analyze the performance of deterministic sampling matrices for compressed sensing. In this paper, we propose the usage of orthogonal symmetric Toeplitz matrices (OSTM) ... More
Low braking index of PSR J1734-3333: an interaction between fall-back disk and magnetic field?Nov 10 2015Recent timing observation reported that the radio pulsar PSR J1734 - 3333 with a rotating period $P=1.17~\rm s$ is slowing down with a period derivative $\dot{P}=2.28\times 10^{-12}\rm s\,s^{-1}$. Its derived braking index $n=0.9 \pm 0.2$ is the lowest ... More
Unconventional thermoelectric behaviors and enhancement of figure of merit in Rashba spintronic systemsJun 13 2015Thermoelectric transport in strongly spin-orbit coupled two-dimensional Rashba system is studied using the exact solution of the linearized Boltzmann equation. Some unusual transport behaviors are revealed. We show that the electrical conductivity takes ... More
CT Super-resolution GAN Constrained by the Identical, Residual, and Cycle Learning Ensemble(GAN-CIRCLE)Aug 10 2018Sep 06 2018Computed tomography (CT) is widely used in screening, diagnosis, and image-guided therapy for both clinical and research purposes. Since CT involves ionizing radiation, an overarching thrust of related technical research is development of novel methods ... More
Triple Exponential Relaxation Dynamics in a Metallacrown-Based {$Dy^{III}Cu^{II}_5$} 3d-4f Single-Molecule MagnetApr 16 2018The interplay of strong single-ion anisotropy and magnetic interactions often give rise to novel magnetic behavior and can provide additional routes for controlling magnetization dynamics. However, novel effects arising from interactions between lanthanide ... More
Incommensurate antiferromagnetic order in the manifoldly-frustrated SrTb$_2$O$_4$ with transition temperature up to 4.28 KJun 30 2014The N$\acute{\rm e}$el temperature of the new frustrated family of Sr\emph{RE}$_2$O$_4$ (\emph{RE} = rare earth) compounds is yet limited to $\sim$ 0.9 K, which more or less hampers a complete understanding of the relevant magnetic frustrations and spin ... More
Polar Codes and Polar Lattices for Independent Fading ChannelsJan 19 2016Feb 05 2016In this paper, we design polar codes and polar lattices for i.i.d. fading channels when the channel state information is only available to the receiver. For the binary input case, we propose a new design of polar codes through single-stage polarization ... More
On Domination Number and Distance in GraphsSep 14 2014A vertex set $S$ of a graph $G$ is a \emph{dominating set} if each vertex of $G$ either belongs to $S$ or is adjacent to a vertex in $S$. The \emph{domination number} $\gamma(G)$ of $G$ is the minimum cardinality of $S$ as $S$ varies over all dominating ... More
Viscosity Solutions to Parabolic Master Equations and McKean-Vlasov SDEs with Closed-loop ControlsMay 07 2018May 28 2018Master equation is a powerful tool for studying McKean-Vlasov dynamics where the distribution of the state process enters the coefficients directly, with particular applications including mean field games and stochastic control problems with partial information. ... More
A Unifying Framework for Typical Multi-Task Multiple Kernel Learning ProblemsJan 21 2014Over the past few years, Multi-Kernel Learning (MKL) has received significant attention among data-driven feature selection techniques in the context of kernel-based learning. MKL formulations have been devised and solved for a broad spectrum of machine ... More
Conic Multi-Task ClassificationAug 20 2014Traditionally, Multi-task Learning (MTL) models optimize the average of task-related objective functions, which is an intuitive approach and which we will be referring to as Average MTL. However, a more general framework, referred to as Conic MTL, can ... More
S-PowerGraph: Streaming Graph Partitioning for Natural Graphs by Vertex-CutNov 09 2015One standard solution for analyzing large natural graphs is to adopt distributed computation on clusters. In distributed computation, graph partitioning (GP) methods assign the vertices or edges of a graph to different machines in a balanced way so that ... More
Orbital period decay of compact black hole x-ray binaries: the influence of circumbinary disks?Nov 02 2015Recently, compact black hole X-ray binaries XTE J 1118+480 and A0620-00 have been reported to be experiencing a fast orbital period decay, which is two orders of magnitude higher than expected with gravitational wave radiation. Magnetic braking of an ... More
Lifted Proximal Operator MachinesNov 05 2018We propose a new optimization method for training feed-forward neural networks. By rewriting the activation function as an equivalent proximal operator, we approximate a feed-forward neural network by adding the proximal operators to the objective function ... More
Neutron Beam Tests of $CsI(Na)$ and $CaF_{2}(Eu)$ Crystals for Dark Matter Direct SearchFeb 16 2016In recent decades, inorganic crystals have been widely used in dark matter direct search experiments. To contribute to the understanding of the capabilities of $CsI(Na)$ and $CaF_{2}(Eu)$ crystals, a mono-energetic neutron beam is utilized to study the ... More
Does P-type Ohmic Contact Exist in WSe2-metal Interfaces?Aug 03 2015Formation of low-resistance metal contacts is the biggest challenge that masks the intrinsic exceptional electronic properties of 2D WSe2 devices. We present the first comparative study of the interfacial properties between ML/BL WSe2 and Sc, Al, Ag, ... More
Competing dynamics of single phosphorus dopant in graphene with electron irradiationMar 04 2018Atomic-level structural changes in materials are important but challenging to study. Here, we demonstrate the dynamics and the possibility of manipulating a phosphorus dopant atom in graphene using scanning transmission electron microscopy (STEM). The ... More
Metallic vanadium disulfide nanosheets as a platform material for multifunctional electrode applicationsMar 28 2017Nano-thick metallic transition metal dichalcogenides such as VS$_{2}$ are essential building blocks for constructing next-generation electronic and energy-storage applications, as well as for exploring unique physical issues associated with the dimensionality ... More
Synchronous Observation on the Spontaneous Transformation of Liquid Metal under Free Falling Microgravity SituationMay 16 2017The unusually high surface tension of room temperature liquid metal is molding it as unique material for diverse newly emerging areas. However, unlike its practices on earth, such metal fluid would display very different behaviors when working in space ... More
Multi-Task Classification Hypothesis Space with Improved Generalization BoundsDec 09 2013This paper presents a RKHS, in general, of vector-valued functions intended to be used as hypothesis space for multi-task classification. It extends similar hypothesis spaces that have previously considered in the literature. Assuming this space, an improved ... More
Convolutional Compressed Sensing Using Deterministic SequencesOct 28 2012In this paper, a new class of circulant matrices built from deterministic sequences is proposed for convolution-based compressed sensing (CS). In contrast to random convolution, the coefficients of the underlying filter are given by the discrete Fourier ... More
Ds+ -- Ds- Asymmetry in PhotoproductionApr 12 2005Jun 04 2005Considering of the possible difference in strange and antistrange quark distributions inside nucleon, we investigate the Ds+ -- Ds- asymmetry in photoproduction in the framework of heavy-quark recombination mechanism. We adopt two distribution models ... More
Classification of the Entangled States of $2 \times N \times N$Apr 15 2008Nov 12 2009We develop a novel method in classifying the multipartite entanglement state of $2\times N\times N$ under stochastic local operation and classical communication. In this method, all inequivalent classes of true entangled state can be assorted directly ... More
On the progenitors of super-Chandrasekhar mass type Ia supernovaeJul 01 2009Jul 04 2009Type Ia supernovae (SNe Ia) can be used as the standard candlelight to determine the cosmological distances because they are thought to have a uniform fuel amount. Recent observations of several overluminous SNe Ia suggest that the white dwarf masses ... More
Evolution of black-hole intermediate-mass X-ray binaries: the influence of a circumbinary discSep 05 2006Justham, Rappaport & Podsiadlowski (2006) recently suggested that black-hole low-mass X-ray binaries (BHLMXBs) with short orbital periods may have evolved from black-hole intermediate-mass X-ray binaries (BHIMXBs). In their model the secondaries in BHIMXBs ... More
Stochastic evolutionary dynamics of minimum-effort coordination gamesMar 19 2016The minimum-effort coordination game, having potentially important implications in both evolutionary biology and sociology, draws recently more attention for the fact that human behavior in this social dilemma is often inconsistent with the predictions ... More
Convergence Rates Analysis of The Quadratic Penalty Method and Its Applications to Decentralized Distributed OptimizationNov 29 2017In this paper, we study a variant of the quadratic penalty method for linearly constrained convex problems, which has already been widely used but actually lacks theoretical justification. Namely, the penalty parameter steadily increases and the penalized ... More
Probing single protein dynamics on liposome surfacesMay 28 2018It is crucial to measure position and conformational changes of a membrane-interacting protein relative to the membrane surface. This is however challenging because the thickness of a membrane is usually only about 4 nm. We developed a fluorescence method ... More