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On the Global Minimization of the Value-at-RiskJan 07 2004In this paper, we consider the nonconvex minimization problem of the value-at-risk (VaR) that arises from financial risk analysis. By considering this problem as a special linear program with linear complementarity constraints (a bilevel linear program ... More

Parallel Successive Convex Approximation for Nonsmooth Nonconvex OptimizationJun 13 2014Oct 31 2014Consider the problem of minimizing the sum of a smooth (possibly non-convex) and a convex (possibly nonsmooth) function involving a large number of variables. A popular approach to solve this problem is the block coordinate descent (BCD) method whereby ... More

Molecular Precursors-Induced Surface Reconstruction at Graphene/Pt(111) InterfacesJul 13 2015Inspired by experimental observations of Pt(111) surfaces reconstruction at the Pt/graphene (Gr) interfaces with ordered vacancy networks in the outermost Pt layer, the mechanism of the surface reconstruction is investigated by van-der-Waals-corrected ... More

Giant atomic magnetocrystalline anisotropy from degenerate orbitals around Fermi levelDec 27 2016Nano-structures with giant magnetocrystalline anisotropy energies (MAE) are desired in designing miniaturized magnetic storage and quantum computing devices. Through ab initio and model calculations, we propose that special p-element dimers and single-adatom ... More

Stability of Two-Dimensional Iron-Carbides Suspended across Graphene Pores: First-principles Particle Swarm OptimizationJul 09 2015Sep 06 2015Inspired by recent experimental realizations of two-dimensional (2D) metals and alloys, we theoretically investigate the stability and electronic properties of monolayer (ML) Fe-C compounds and pure Fe. According to our and others theoretical results, ... More

Joint Sensing and Power Allocation in Nonconvex Cognitive Radio Games: Nash Equilibria and Distributed AlgorithmsDec 27 2012In this paper, we propose a novel class of Nash problems for Cognitive Radio (CR) networks, modeled as Gaussian frequency-selective interference channels, wherein each secondary user (SU) competes against the others to maximize his own opportunistic throughput ... More

Joint Sensing and Power Allocation in Nonconvex Cognitive Radio Games: Quasi-Nash EquilibriaDec 26 2012In this paper, we propose a novel class of Nash problems for Cognitive Radio (CR) networks composed of multiple primary users (PUs) and secondary users (SUs) wherein each SU (player) competes against the others to maximize his own opportunistic throughput ... More

Exact Penalization of Generalized Nash Equilibrium ProblemsNov 26 2018Dec 01 2018This paper presents an exact penalization theory of the generalized Nash equilibrium problem (GNEP) that has its origin from the renowned Arrow-Debreu general economic equilibrium model. While the latter model is the foundation of much of mathematical ... More

On the Finite Number of Directional Stationary Values of Piecewise ProgramsMar 01 2018Extending a fundamental result for (indefinite) quadratic programs, this paper shows that certain non-convex piecewise programs have only a finite number of directional stationary values, and thus, possess only finitely many locally minimum values. We ... More

Lithium Intercalation in Graphene/MoS2 Composites: First-Principles InsightsJul 22 2015As a storage material for Li-ion batteries, graphene/molybdenum disulfide (Gr/MoS2) composites have been intensively studied in experiments. But the relevant theoretical works from first-principles are lacking. In the current work, van-der-Waals-corrected ... More

R$^2$-CNN: Fast Tiny Object Detection in Large-Scale Remote Sensing ImagesFeb 16 2019Mar 30 2019Recently, the convolutional neural network has brought impressive improvements for object detection. However, detecting tiny objects in large-scale remote sensing images still remains challenging. First, the extreme large input size makes the existing ... More

Large Scale Purchase Prediction with Historical User Actions on B2C Online Retail PlatformAug 27 2014Mar 04 2015This paper describes the solution of Bazinga Team for Tmall Recommendation Prize 2014. With real-world user action data provided by Tmall, one of the largest B2C online retail platforms in China, this competition requires to predict future user purchases ... More

Manipulating Magnetism at Organic/Ferromagnetic Interfaces by Fullerene-Induced Surface ReconstructionJul 30 2015Fullerenes have several advantages as potential materials for organic spintronics. Through a theoretical first-principles study, we report that fullerene C$_{60}$ adsorption can induce a magnetic reconstruction in a Ni(111) surface and expose the merits ... More

FishNet: A Versatile Backbone for Image, Region, and Pixel Level PredictionJan 11 2019The basic principles in designing convolutional neural network (CNN) structures for predicting objects on different levels, e.g., image-level, region-level, and pixel-level are diverging. Generally, network structures designed specifically for image classification ... More

Fullerene antiferromagnetic reconstructed spinterface subsurface layer dominates multi-orbitals spin-splitting and large magnetic moment in C60Oct 26 2016The interfaces between organic molecules and metal surfaces with layered antiferromagnetic order have gained increasing interests in the field of antiferromagnetic spintronics. The C60 layered AFM spinterfaces have been studied for C60 bonded only to ... 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

On the Pervasiveness of Difference-Convexity in Optimization and StatisticsApr 11 2017Feb 19 2019With the increasing interest in applying the methodology of difference-of-convex (dc) optimization to diverse problems in engineering and statistics, this paper establishes the dc property of many well-known functions not previously known to be of this ... More

A Unifying Framework of High-Dimensional Sparse Estimation with Difference-of-Convex (DC) RegularizationsDec 18 2018Under the linear regression framework, we study the variable selection problem when the underlying model is assumed to have a small number of nonzero coefficients (i.e., the underlying linear model is sparse). Non-convex penalties in specific forms are ... More

A New Distributed DC-Programming Method and its ApplicationsAug 15 2013Sep 20 2013We propose a novel decomposition framework for the distributed optimization of Difference Convex (DC)-type nonseparable sum-utility functions subject to coupling convex constraints. A major contribution of the paper is to develop for the first time a ... More

Estimating Individualized Decision Rules with Tail ControlsMar 11 2019With the emergence of precision medicine, estimating optimal individualized decision rules (IDRs) has attracted tremendous attentions in many scientific areas. Most existing literature has focused on finding optimal IDRs that can maximize the expected ... More

Composite Difference-Max Programs for Modern Statistical Estimation ProblemsMar 01 2018Oct 07 2018Many modern statistical estimation problems are defined by three major components: a statistical model that postulates the dependence of an output variable on the input features; a loss function measuring the error between the observed output and the ... More

Computing B-Stationary Points of Nonsmooth DC ProgramsNov 05 2015Motivated by a class of applied problems arising from physical layer based security in a digital communication system, in particular, by a secrecy sum-rate maximization problem, this paper studies a nonsmooth, difference-of-convex (dc) minimization problem. ... More

Synthesis and spectroscopic characterization of completely isotactic polyacrylonitrileOct 09 2012Jan 15 2013Completely isotactic polyacrylonitrile (i-PAN) has been synthesized successfully by an improved urea inclusion polymerization. The tacticity of prepared samples were confirmed by 13C nuclear magnetic resonance (NMR), Fourier transform infrared (FT-IR) ... More

The Formation and Characteristics of Acrylonitrile/Urea Inclusion CompoundOct 09 2012Mar 07 2013The formation process and composition of the acrylonitrile/urea inclusion compounds (AN/UIC) with different aging times and AN/urea molar feed ratios are studied by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). It is suggested that ... More

Generation of femtosecond optical vortex beams in all-fiber mode-locked fiber laser using mode selective couplerNov 30 2016We experimentally demonstrated a high-order optical vortex pulsed laser based on a mode selective all-fiber fused coupler composed of a single-mode fiber (SMF) and a few-mode fiber (FMF). The fused SMF-FMF coupler inserted in the cavity not only acts ... More

Libra R-CNN: Towards Balanced Learning for Object DetectionApr 04 2019Compared with model architectures, the training process, which is also crucial to the success of detectors, has received relatively less attention in object detection. In this work, we carefully revisit the standard training practice of detectors, and ... More

Distributed Power Allocation with Rate Constraints in Gaussian Parallel Interference ChannelsFeb 28 2007Jan 18 2008This paper considers the minimization of transmit power in Gaussian parallel interference channels, subject to a rate constraint for each user. To derive decentralized solutions that do not require any cooperation among the users, we formulate this power ... More

On Synchronous, Asynchronous, and Randomized Best-Response schemes for computing equilibria in Stochastic Nash gamesApr 15 2017Feb 06 2018This work considers a stochastic Nash game in which each player solves a parameterized stochastic optimization problem. In deterministic regimes, best-response schemes have been shown to be convergent under a suitable spectral property associated with ... More

A Unified Algorithmic Framework for Block-Structured Optimization Involving Big DataNov 09 2015This article presents a powerful algorithmic framework for big data optimization, called the Block Successive Upper bound Minimization (BSUM). The BSUM includes as special cases many well-known methods for analyzing massive data sets, such as the Block ... More

Clustering by Orthogonal NMF Model and Non-Convex Penalty OptimizationJun 03 2019The non-negative matrix factorization (NMF) model with an additional orthogonality constraint on one of the factor matrices, called the orthogonal NMF (ONMF), has been found to provide improved clustering performance over the K-means. Solving the ONMF ... More

Solving Linear Programs with Complementarity Constraints using Branch-and-CutFeb 08 2018A linear program with linear complementarity constraints (LPCC) requires the minimization of a linear objective over a set of linear constraints together with additional linear complementarity constraints. This class has emerged as a modeling paradigm ... More

Real and Complex Monotone Communication GamesDec 26 2012Dec 14 2013Noncooperative game-theoretic tools have been increasingly used to study many important resource allocation problems in communications, networking, smart grids, and portfolio optimization. In this paper, we consider a general class of convex Nash Equilibrium ... More

A Study of Piecewise Linear-Quadratic ProgramsSep 18 2017Aug 14 2018Motivated by a growing list of nontraditional statistical estimation problems of the piecewise kind, this paper provides a survey of known results supplemented with new results for the class of piecewise linear-quadratic programs. These are linearly constrained ... More

Super-Exchange Theory for Polyvalent Anion MagnetsFeb 19 2019The Goodenough-Kanamori-Anderson (GKA) rules have been widely applied for explaining the magnetic properties induced by super-exchange interaction. As conclusions of the super-exchange theory, they reveal the antiferromagnetic (ferromagnetic) ordering ... More

Large linear magnetoresistance in Dirac semi-metal Cd3As2 with Fermi surfaces close to the Dirac pointsMay 26 2014We have investigated the magnetoresistive behavior of Dirac semi-metal Cd3As2 down to low temperatures and in high magnetic fields. A positive and linear magnetoresistance (LMR) as large as 3100% is observed in a magnetic field of 14 T, on high-quality ... More

A Geometric Interpretation of the Normal Closure of the Braid Group $B_n$ in the braid group of the torus $B_n(T)$Jun 20 2018Jan 24 2019Combining the results by Birman and Goldberg, it was proved the normal closure of the pure braid group of the disk $P_n(D)$ in the pure braid group of the torus $P_n(T)$ is the commutator subgroup $[P_n(T),P_n(T)]$. In this paper we are going to study ... More

Thermoelectric properties of polycrystalline palladium sulfideFeb 08 2018A suite measurements of the electrical, thermal, and vibrational properties are conducted on palladium sulfide (PdS) in order to investigate its thermoelectric performance. The tetragonal structure with the space group $P$42/$m$ for PdS is determined ... More

Pressure-induced superconductivity in palladium sulfideJan 19 2018An extended study on PdS is carried out with the measurements of the resistivity, Hall coefficient, Raman scattering, and X-ray diffraction at high pressures up to 42.3 GPa. With increasing pressure, superconductivity is observed accompanying with a structural ... More

Decomposition by Partial Linearization: Parallel Optimization of Multi-Agent SystemsFeb 04 2013Sep 20 2013We propose a novel decomposition framework for the distributed optimization of general nonconvex sum-utility functions arising naturally in the system design of wireless multiuser interfering systems. Our main contributions are: i) the development of ... More

Non-gapped Fermi surfaces, quasiparticles and the anomalous temperature dependence of the near-$E_F$ electronic states in the CMR oxide La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ with $x=0.36$Oct 10 2007After years of research into colossal magnetoresistant (CMR) manganites using bulk techniques, there has been a recent upsurge in experiments directly probing the electronic states at or near the surface of the bilayer CMR materials La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ ... More

Nodeless superconductivity and time-reversal symmetry breaking in the noncentrosymmetric superconductor Re24Ti5Jan 06 2018The noncentrosymmetric superconductor Re$_{24}$Ti$_{5}$, a time-reversal symmetry (TRS) breaking candidate with $T_c = 6$\,K, was studied by means of muon-spin rotation/relaxation ($\mu$SR) and tunnel-diode oscillator (TDO) techniques. At a macroscopic ... More

Hybrid Task Cascade for Instance SegmentationJan 22 2019Apr 09 2019Cascade is a classic yet powerful architecture that has boosted performance on various tasks. However, how to introduce cascade to instance segmentation remains an open question. A simple combination of Cascade R-CNN and Mask R-CNN only brings limited ... More

Hybrid Task Cascade for Instance SegmentationJan 22 2019Cascade is a classic yet powerful architecture that has boosted performance on various tasks. However, how to introduce cascade to instance segmentation remains an open question. A simple combination of Cascade R-CNN and Mask R-CNN only brings limited ... More

Optimization Method for Interval Portfolio Selection Based on Satisfaction Index of Interval inequality RelationJul 09 2012In this paper we consider an interval portfolio selection problem with uncertain returns and introduce an inclusive concept of satisfaction index for interval inequality relation. Based on the satisfaction index, we propose an approach to reduce the interval ... More

An Augmented Smoothing Method of L1 -norm Minimization and Its Implementation by Neural Network ModelJul 09 2012In this paper we propose an augmented smoothing function for nonlinear L1 -norm minimization problem and consider a global stability of a gradient-based neural network model to minimize the smoothing function. The numerical simulations show that our smoothing ... More

Practical Global Optimization Algorithm for the Sum-of-Ratios ProblemJul 05 2012Aug 06 2012This paper presents a practical method for finding the globally optimal solution to the sum-of-ratios problem arising in image processing, engineering and management. Unlike traditional methods which may get trapped in local minima due to the non-convex ... More

Integrated Circuits Based on Bilayer MoS2 TransistorsAug 06 2012Two-dimensional (2D) materials, such as molybdenum disulfide (MoS2), have been shown to exhibit excellent electrical and optical properties. The semiconducting nature of MoS2 allows it to overcome the shortcomings of zero-bandgap graphene, while still ... More

Graph Laplacian Regularization for Inverse Imaging: Analysis in the Continuous DomainApr 27 2016Inverse imaging problems are inherently under-determined, and hence it is important to employ appropriate image priors for regularization. One recent popular prior---the graph Laplacian regularizer---assumes that the target pixel patch is smooth with ... More

Galois representations attached to automorphic forms on GL_2 over CM fieldsSep 25 2011Sep 03 2013In this paper we generalize the work of Harris-Soudry-Taylor and construct the compatible systems of two-dimensional Galois representations attached to cuspidal automorphic representations of cohomological type on GL_2 over a CM field with a suitable ... More

A dual ascent algorithm for asynchronous distributed optimization with unreliable directed communicationsSep 25 2018Feb 21 2019We show that the averaged consensus algorithm on directed graphs with unreliable communications by Bof-Carli-Schenato has a dual optimization interpretation, which could be extended to the case of distributed optimization. We report on our numerical simulations ... More

Equivalence of Fluid Models for $G_t/GI/N+GI$ QueuesFeb 02 2015Aug 28 2017Four different fluid model formulations have been recently developed for $G_t/GI/N+GI$ queues, including a two-parameter fluid model in Whitt (2006) by tracking elapsed service and patience times of each customer, a measure-valued fluid model in Kang ... More

Frame Dependence of Parton Cascade ResultsNov 06 1996Frame dependence of parton cascade results is studied for different schemes of doing cascade simulations. We show that different schemes do not always agree and results may have strong frame dependence. When the interaction range is on the order of mean ... More

Improved analysis of algorithms based on supporting halfspaces and quadratic programming for the convex intersection and feasibility problemsJun 16 2014This paper improves the algorithms based on supporting halfspaces and quadratic programming for convex set intersection problems in our earlier paper in several directions. First, we give conditions so that much smaller quadratic programs (QPs) and approximate ... More

Ergodicity and fluctuations of a fluid particle driven by diffusions with jumpsFeb 16 2015In this paper, we study the long-time behavior of a fluid particle immersed in a turbulent fluid driven by a diffusion with jumps, that is, a Feller process associated with a non-local operator. We derive the law of large numbers and central limit theorem ... More

Continuity of a queueing integral representation in the ${M}_{\mathbf{1}}$ topologyJan 14 2010We establish continuity of the integral representation $y(t)=x(t)+\int_0^th(y(s)) ds$, $t\ge0$, mapping a function $x$ into a function $y$ when the underlying function space $D$ is endowed with the Skorohod $M_1$ topology. We apply this integral representation ... More

Finding saddle points of mountain pass type with quadratic models on affine spacesJul 21 2011Nov 19 2012The problem of computing saddle points is important in certain problems in numerical partial differential equations and computational chemistry, and is often solved numerically by a minimization problem over a set of mountain passes. We propose an algorithm ... More

Linear convergence of a dual optimization formulation for distributed optimization on directed graphs with unreliable communicationsNov 28 2018This work builds on our recent work on a distributed optimization algorithm for graphs with directed unreliable communications. We show its linear convergence when we take either the proximal of each function or an affine minorant for when the function ... More

Few-photon computed x-ray imagingJun 24 2018Jul 18 2018X-ray is a ubiquitous imaging modality in clinical diagnostics and industrial inspections, thanks to its high penetration power. Conventional x-ray imaging system, equipped with energy-integrating detectors, collects approximately 1000 to 10000 counts ... More

Unambiguous Examining the Orthogonality of Multiple Quantum StatesMay 03 2012In this article, we study an opposite problem of universal quantum state comparison, that is unambiguous determining whether multiple unknown quantum states from a Hilbert space are orthogonal or not. We show that no unambiguous quantum measurement can ... More

Quantum interactions between a laser interferometer and gravitational wavesAug 28 2018LIGO's detection of gravitational waves marks a first step in measurable effects of general relativity on quantum matter. In its current operation, laser interferometer gravitational-wave detectors are already quantum limited at high frequencies, and ... More

A Trouble with Hořava-Lifshitz GravityMay 17 2009Aug 07 2009We study the structure of the phase space in Ho\v{r}ava-Lifshitz theory. With the constraints derived from the action, the phase space is described by five fields, thus there is a lack of canonical structure. The Poisson brackets of the Hamiltonian density ... More

The supporting halfspace- quadratic programming strategy for the dual of the best approximation problemJan 06 2016We consider the best approximation problem (BAP) of projecting a point onto the intersection of a number of convex sets. It is known that Dykstra's algorithm is alternating minimization on the dual problem. We extend Dykstra's algorithm so that it can ... More

Accelerating the alternating projection algorithm for the case of affine subspaces using supporting hyperplanesJun 16 2014Jul 16 2014The von Neumann-Halperin method of alternating projections converges strongly to the projection of a given point onto the intersection of finitely many closed affine subspaces. We propose acceleration schemes making use of two ideas: Firstly, each projection ... More

Learning Criteria and Evaluation Metrics for Textual Transfer between Non-Parallel CorporaOct 28 2018We consider the problem of automatically generating textual paraphrases with modified attributes or stylistic properties, focusing on the setting without parallel data (Hu et al., 2017; Shen et al., 2017). This setting poses challenges for learning and ... More

Asymptotic Inference for AR(1) Penal DataNov 14 2016A general asymptotic theory is given for the panel data AR(1) model with time series independent in different cross sections. The theory covers the cases of stationary process, nearly non-stationary process, unit root process, mildly integrated, mildly ... More

Do all identically conserved geometric tensors come from actions? A status reportNov 07 2018Feb 12 2019Noether's theorem, that local gauge variations of gauge invariant actions are identically conserved (more tautologically, that gauge variations of gauge invariants vanish) was established a century ago. Its converse, in the geometric context: are all ... More

Supersymmetric Completion of Gauss-Bonnet Combination in Five DimensionsJan 28 2013Jul 08 2013Based on superconformal tensor calculus in five dimensions, we construct the supersymmetric completion of Gauss-Bonnet combination. We study the vacuum solutions with AdS_2 x S^3 and AdS_3 x S^2 structures. We also analyze the spectrum around a maximally ... More

Towards the Capacity Region of Multiplicative Linear Operator Broadcast ChannelsDec 28 2010May 14 2011Recent research indicates that packet transmission employing random linear network coding can be regarded as transmitting subspaces over a linear operator channel (LOC). In this paper we propose the framework of linear operator broadcast channels (LOBCs) ... More

Convergence rate of distributed Dykstra's algorithm with sets defined as level sets of convex functionsSep 25 2018We investigate the convergence rate of the distributed Dykstra's algorithm when some of the sets are defined as the level sets of convex functions. We carry out numerical experiments to compare with the theoretical results obtained.

Finitely convergent algorithm for nonconvex inequality problemsMay 28 2014Jul 31 2014We extend Fukushima's result on the finite convergence of an algorithm for the global convex feasibility problem to the local nonconvex case.

Endoscopic classification of representations of quasi-split unitary groupsJun 05 2012Jun 22 2013In this paper we establish the endoscopic classification of tempered representations of quasi-split unitary groups over local fields, and the endoscopic classification of the discrete automorphic spectrum of quasi-split unitary groups over global number ... More

From N M2's to N D2'sJul 09 2008May 06 2009In this short note, we reduce the N=6, U(N)xU(N) Chern-Simons gauge theories to N=8, U(N) Yang-Mills gauge theories. This process corresponds to recovering the world-volume theory of N D2-branes from that of N M2-branes in an intermediate energy range. ... More

Strong Rashba-Edelstein Effect-Induced Spin-Orbit Torques in Monolayer Transition-Metal Dichalcogenide/Ferromagnet BilayersNov 21 2018The electronic and optoelectronic properties of two dimensional materials have been extensively explored in graphene and layered transition metal dichalcogenides (TMDs). Spintronics in these two-dimensional materials could provide novel opportunities ... More

A Hopf-Algebraic Lift of the Down-Up Markov Chain on Partitions to PermutationsAug 06 2015In "Card shuffling and the decomposition of tensor products", Jason Fulman explores a Markov chain on partition diagrams, where each step removes a box then adds a new box. The stationary distribution of this chain is the Plancherel measure, which suggests ... More

Subdifferential analysis of differential inclusions via discretizationDec 09 2011Apr 27 2012The framework of differential inclusions encompasses modern optimal control and the calculus of variations. Necessary optimality conditions in the literature identify potentially optimal paths, but do not show how to perturb paths to optimality. We first ... More

Two-Parameter Heavy-Traffic Limits for Infinite-Server QueuesDec 04 2008Jul 09 2010In order to obtain Markov heavy-traffic approximations for infinite-server queues with general non-exponential service-time distributions and general arrival processes, possibly with time-varying arrival rates, we establish heavy-traffic limits for two-parameter ... More

Nonconvex set intersection problems: From projection methods to the Newton method for super-regular setsJun 27 2015The problem of finding a point in the intersection of closed sets can be solved by the method of alternating projections and its variants. It was shown in earlier papers that for convex sets, the strategy of using quadratic programming (QP) to project ... More

Linear convergence of distributed Dykstra's algorithm for sets under an intersection propertyDec 10 2018Feb 21 2019We show the linear convergence of Dykstra's algorithm for sets intersecting in a manner slightly stronger than the usual constraint qualifications.

Distributed deterministic asynchronous algorithms in time-varying graphs through Dykstra splittingApr 30 2018Nov 28 2018Consider the setting where each vertex of a graph has a function, and communications can only occur between vertices connected by an edge. We wish to minimize the sum of these functions. For the case when each function is the sum of a strongly convex ... More

A peculiar two point boundary value problemOct 12 2007In this paper we consider a one-dimensional diffusion equation on the interval $[0,1]$ satisfying non-Feller boundary conditions. As a consequence, the initial value Cauchy problem fails to preserve nonnegativity or boundedness. Nonetheless, probability ... More

A Unified Theory of Multiple-Access and Interference Channels via Approximate Capacity Regions for the MAC-IC-MACApr 08 2016Sep 03 2018Approximate capacity regions are established for a class of interfering multiple access channels consisting of two multiple-access channels (MACs), each with an arbitrary number of transmitters, with one transmitter in each MAC causing interference to ... More

Adaptive Optimal Control of Linear Periodic Systems: An Off-Policy Value Iteration ApproachJan 24 2019Although significant progresses have been achieved in the development of adaptive dynamic programming (ADP) algorithms for dynamical systems described by time-invariant differential equations in recent years, how to design ADP algorithms for time-varying ... More

Understanding light scalar meson by color-magnetic wavefunction in QCD sum ruleJan 11 2009Jul 19 2009In this paper, we study the $0^{+}$ nonet mesons as tetraquark states with interpolating currents induced from the color-magnetic wavefunction. This wavefunction is the eigenfunction of effective color-magnetic Hamiltonian with the lowest eigenvalue, ... More

The spectral side of stable local trace formula for real groupsAug 30 2017Dec 04 2018Let $G$ be a connected quasi-split reductive group over $\mathbb{R}$, and more generally, a quasi-split $K$-group over $\mathbb{R}$. Arthur had obtained the formal formula for the spectral side of the stable local trace formula, by using formal substitute ... More

Landau level transitions in InAs/AlSb/GaSb quantum wellsMar 12 2015The electronic structure of InAs/AlSb/GaSb quantum wells embedded in AlSb barriers and in the presence of a perpendicular magnetic field is studied theoretically within the $14$-band ${\bf k}\cdot{\bf p}$ approach without making the axial approximation. ... More

Exact wave functions for the edge state of a disk-shaped two dimensional topological insulatorSep 22 2013We report the exact wave functions for the eigen state of a disk-shaped two dimensional topological insulator. The property of the edge state whose energy lies inside the bulk gap is studied. It is found that the edge state energy is affected by the radius ... More

On the correction equation of the Jacobi-Davidson methodOct 05 2015Nov 03 2015The Jacobi-Davidson method is one of the most popular approaches for iteratively computing a few eigenvalues and their associated eigenvectors of a large matrix. The key of this method is to expand the search subspace via solving the Jacobi-Davidson correction ... More

Long spin coherence length and bulk-like spin-orbit torque in ferrimagnetic multilayersOct 24 2018Ferromagnetic spintronics has been a main focus as it offers non-volatile memory and logic applications through current-induced spin-transfer torques. Enabling wider applications of such magnetic devices requires a lower switching current for a smaller ... More

Bilayer manganites: polarons in the midst of a metallic breakdownMar 19 2011The exact nature of the low temperature electronic phase of the manganite materials family, and hence the origin of their colossal magnetoresistant (CMR) effect, is still under heavy debate. By combining new photoemission and tunneling data, we show that ... More

Trigger of the ubiquitous surface band bending in 3D topological insulatorsNov 14 2017The main scientific activity in the field of topological insulators (TIs) consists of determining their electronic structure by means of magneto-transport and electron spectroscopy with a view to devices based on topological transport. There is however ... More

Micro-metric electronic patterning of a topological band structure using a photon beamDec 02 2014Nov 27 2015In an ideal 3D topological insulator (TI), the bulk is insulating and the surface conducting due to the existence of metallic states that are localized on the surface; these are the topological surface states. Quaternary Bi-based compounds of Bi$_{2-x}$Sb$_{x}$Te$_{3-y}$Se$_{y}$ ... More

Fast View Frustum Culling of Spatial Object by Analytical Bounding BinJul 17 2012It is a common sense to apply the VFC (view frustum culling) of spatial object to bounding cube of the object in 3D graphics. The accuracy of VFC can not be guaranteed even in cube rotated three-dimensionally. In this paper is proposed a method which ... More

Faltings delta-invariant and semistable degenerationNov 20 2015We determine the asymptotics of the Arakelov metric, Arakelov-Green's function, and Faltings delta-invariant, in a one-parameter family of complex curves with semistable degeneration. The leading terms of the asymptotics are controlled by Zhang's theory ... More

Theta functions on the theta divisorNov 27 2006May 01 2007We show that the gradient and the hessian of the Riemann theta function in dimension n can be combined to give a theta function of order n+1 and modular weight (n+5)/2 defined on the theta divisor. It can be seen that the zero locus of this theta function ... More

Growth of Large-Area and Highly Crystalline MoS2 Thin Layers on Insulating SubstratesFeb 24 2012The two-dimensional layer of molybdenum disulfide (MoS2) has recently attracted much interest due to its direct-gap property and potential applications in optoelectronics and energy harvesting. However, the synthetic approach to obtain high quality and ... More

Comparison of the Sachs-Wolfe Effect for Gaussian and Non-Gaussian FluctuationsAug 28 1992A consequence of non-Gaussian perturbations on the Sachs-Wolfe effect is studied. For a particular power spectrum, predicted Sachs-Wolfe effects are calculated for two cases: Gaussian (random phase) configuration, and a specific kind of non-Gaussian configuration. ... More

B, V, R, I, H and K Images of 86 Face-On Spiral GalaxiesNov 01 1996FITS images in the B, V, R, I, H and K passbands are presented of a sample of 86 face-on spiral galaxies. The galaxies were selected from the UGC to have a diameter of at least 2 arcmin and a minor over major axis ratio larger than 0.625. The selected ... More

On a Modification of the Agrawal-Biswas Primality TestOct 23 2018We present a variant of the Agrawal-Biswas algorithm, a Monte Carlo algorithm which tests the primality of an integer $N$ by checking whether or not $(x+a)^N$ and $x^N + a$ are equivalent in a residue ring of $\mathbb{Z}/N\mathbb{Z}[x]$. The variant that ... More

Admissible constants for genus 2 curvesMay 07 2009S.-W. Zhang recently introduced a new adelic invariant for curves of genus at least 2 over number fields and function fields. We calculate this invariant when the genus is equal to 2.

Near-infrared and optical broadband surface photometry of 86 face-on disk dominated galaxies. IV. Using color profiles to study stellar and dust content of galaxiesApr 02 1996The stellar and dust content of spiral galaxies as function of radius has been investigated using near-infrared and optical broadband surface photometry of 86 face-on spiral galaxies. Colors of galaxies correlate with the azimuthally averaged local surface ... More