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Results for "Zhang Fan"
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Fractional Josephson Effect: A Missing Step Is A Key StepDec 28 2018Physicists are searching for superconducting materials that can host Majoranas. New evidence for these elusive particles is provided by missing Shapiro steps in a Josephson effect mediated by an accidental Dirac semimetal. Community Detection for Multilayer Heterogeneous NetworkMay 17 2017Sep 16 2017Many real world networks consist of multiple types of nodes with edges that are heterogeneous in nature. However, most of the existing work for community detection only focused on homogeneous network consisting of a single layer. In this paper, we propose ... More Iso-Orthogonality and Type II Duadic Constacyclic CodesJan 07 2015Apr 19 2016Generalizing even-like duadic cyclic codes and Type-II duadic negacyclic codes, we introduce even-like (i.e.,Type-II) and odd-like duadic constacyclic codes, and study their properties and existence. We show that even-like duadic constacyclic codes are ... More From CM-finite to CM-freeDec 26 2012May 01 2014The aim of this paper is twofold. On one hand, we prove a slight generalization of the stability for Gorenstein categories in [SWSW] and [Huang]; and show that the relative Auslander algebra of a CM-finite algebra is CM-free. On the other hand, we describe ... More Memristor-based Deep Convolution Neural Network: A Case StudySep 14 2018In this paper, we firstly introduce a method to efficiently implement large-scale high-dimensional convolution with realistic memristor-based circuit components. An experiment verified simulator is adapted for accurate prediction of analog crossbar behavior. ... More Isometrically Self-dual Cyclic CodesOct 04 2016General isometries of cyclic codes, including multipliers and translations, are introduced; and isometrically self-dual cyclic codes are defined. In terms of Type-I duadic splittings given by multipliers and translations, a necessary and sufficient condition ... More Modulation Codes for Flash Memory Based on Load-Balancing TheoryOct 12 2009In this paper, we consider modulation codes for practical multilevel flash memory storage systems with cell levels. Instead of maximizing the lifetime of the device [Ajiang-isit07-01, Ajiang-isit07-02, Yaakobi_verdy_siegel_wolf_allerton08, Finucane_Liu_Mitzenmacher_aller08], ... More Quantum Metrological Bounds for Vector ParameterFeb 25 2014Nov 08 2014Precise measurement is crucial to science and technology. However, the rule of nature imposes various restrictions on the precision that can be achieved depending on specific methods of measurement. In particular, quantum mechanics poses the ultimate ... More Zeno dynamics in quantum open systemsJun 10 2013Jun 25 2015Quantum Zeno effect shows that frequent observations can slow down or even stop the unitary time evolution of an unstable quantum system. This effect can also be regarded as a physical consequence of the the statistical indistinguishability of neighboring ... More Fundamental Limits of Training-Based Multiuser MIMO SystemsNov 29 2015Feb 24 2016In this paper, we endeavour to seek a fundamental understanding of the potentials and limitations of training-based multiuser multiple-input multiple-output (MIMO) systems. In a multiuser MIMO system, users are geographically separated. So, the near-far ... More Competing Ordered States in Bilayer GrapheneMay 24 2012We use a perturbative renormalization group approach with short-range continuum model interactions to analyze the competition between isotropic gapped and anisotropic gapless ordered states in bilayer graphene, commenting specifically on the role of exchange ... More Pseudospin Order in Monolayer, Bilayer, and Double-Layer GrapheneSep 01 2011Jan 18 2012Graphene is a gapless semiconductor in which conduction and valence band wavefunctions differ only in the phase difference between their projections onto the two sublattices of the material's two-dimensional honeycomb crystal structure. We explain why ... More Multiple testing via $FDR_L$ for large-scale imaging dataMar 10 2011The multiple testing procedure plays an important role in detecting the presence of spatial signals for large-scale imaging data. Typically, the spatial signals are sparse but clustered. This paper provides empirical evidence that for a range of commonly ... More Derived Categories and Lie AlgebrasApr 26 2006Jan 27 2010Let $\md^b(A)$ be the derived category of a finite dimensional basic algebra $A$ with finite global dimension. We construct the Lie algebra arising from the 2-periodic version $\mk_2(\mp(A))$ of $\mk^b(\mp(A))$ in term of constructible functions on varieties ... More Comparisons of penalized least squares methods by simulationsMay 08 2014Penalized least squares methods are commonly used for simultaneous estimation and variable selection in high-dimensional linear models. In this paper we compare several prevailing methods including the lasso, nonnegative garrote, and SCAD in this area ... More Possible Superconductivity Approaching Ice PointJul 30 2015Jun 23 2016Recently BCS superconductivity at 203 K has been discovery in a highly compressed hydrogen sulfide. We use first-principles calculations to systematically examine the effects of partially substituting the chalcogen atoms on the superconductivity of hydrogen ... More Curvature effect in structured GRB jetsNov 24 2005We study the influence of jet structure on the curvature effect in a GRB-lightcurve. Using a simple model of jet emissivity, we numerically calculate lightcurves for a short flash from a relativistic outflow having various profiles of the Lorentz factor ... More Quantum Dissonance Is Rejected in an Overlap Measurement SchemeNov 12 2012The overlap measurement scheme accomplishes to evaluate the overlap of two input quantum states by only measuring an introduced auxiliary qubit, irrespective of the complexity of the two input states. We find a counterintuitive phenomenon that no quantum ... More Tensor and Its Tucker Core: the Invariance RelationshipsJan 07 2016Nov 06 2016In , Hillar and Lim famously demonstrated that "multilinear (tensor) analogues of many efficiently computable problems in numerical linear algebra are NP-hard". Despite many recent advancements, the state-of-the-art methods for computing such `tensor ... More Decomposition of torsion pairs on module categoriesMay 07 2012In this article, we generalize the concept of torsion pairs and study its structure. As a trial of obtaining all torsion pairs, we decompose torsion pairs by projective modules and injective modules. Then we calculate torsion pairs on the algebra KAn ... More Quantum Criticality in the Biased Dicke ModelDec 21 2015The biased Dicke model describes a system of biased two-level atoms coupled to a bosonic field, and is expected to produce new phenomena that are not present in the original Dicke model. In this paper, we study the critical properties of the biased Dicke ... More Distributionally Robust Selection of the BestMar 14 2019Specifying a proper input distribution is often a challenging task in simulation modeling. In practice, there may be multiple plausible distributions that can fit the input data reasonably well, especially when the data volume is not large. In this paper, ... More On subcritically Stein fillable 5-manifoldsOct 25 2016Feb 13 2017We make some elementary observations concerning subcritically Stein fillable contact structures on 5-manifolds. Specifically, we determine the diffeomorphism type of such contact manifolds in the case the fundamental group is finite cyclic, and we show ... More Isometric Multi-Manifolds LearningDec 03 2009Isometric feature mapping (Isomap) is a promising manifold learning method. However, Isomap fails to work on data which distribute on clusters in a single manifold or manifolds. Many works have been done on extending Isomap to multi-manifolds learning. ... More A semiparametric model for cluster dataAug 24 2009In the analysis of cluster data, the regression coefficients are frequently assumed to be the same across all clusters. This hampers the ability to study the varying impacts of factors on each cluster. In this paper, a semiparametric model is introduced ... More Symmetric identities on Bernoulli polynomialsSep 17 2007In this paper, we obtain a generalization of an identity due to Carlitz on Bernoulli polynomials. Then we use this generalized formula to derive two symmetric identities which reduce to some known identities on Bernoulli polynomials and Bernoulli numbers, ... More Linearly polarized X-ray flares following short gamma-ray burstsSep 01 2005Nov 16 2005Soft X-ray flares were detected to follow the short-duration gamma-ray burst GRB 050724. The temporal properties of the flares suggest that they are likely due to the late time activity of the central engine. We argue that if short GRBs are generated ... More Few Shot Learning with SimplexJul 27 2018Oct 30 2018Deep learning has made remarkable achievement in many fields. However, learning the parameters of neural networks usually demands a large amount of labeled data. The algorithms of deep learning, therefore, encounter difficulties when applied to supervised ... More Generalization Bounds for Representative Domain AdaptationJan 02 2014In this paper, we propose a novel framework to analyze the theoretical properties of the learning process for a representative type of domain adaptation, which combines data from multiple sources and one target (or briefly called representative domain ... More Directional radiation of sound waves by a subwavelength sourceFeb 23 2017Feb 24 2017We propose and experimentally achieve a directional dipole field radiated by an omnidirectional monopole source enclosed in a subwavelength structure of acoustically hybrid resonances. The whole structure has its every dimension at an order smaller than ... More Real-time Decolorization using Dominant ColorsApr 10 2014Apr 22 2014Decolorization is the process to convert a color image or video to its grayscale version, and it has received great attention in recent years. An ideal decolorization algorithm should preserve the original color contrast as much as possible. Meanwhile, ... More Fast Marginalized Block Sparse Bayesian Learning AlgorithmNov 21 2012Sep 29 2013The performance of sparse signal recovery from noise corrupted, underdetermined measurements can be improved if both sparsity and correlation structure of signals are exploited. One typical correlation structure is the intra-block correlation in block ... More Polarization and Variations of BL Lacertae ObjectsOct 29 1999Mar 02 2001BL Lacertae objects are an extreme subclass of AGNs showing rapid and large-amplitude variability, high and variable polarization, and core-dominated radio emissions. If a strong beaming effect is the cause of the extreme observation properties, one would ... More The Radio and Gamma-Ray Luminosities of BlazarsMar 02 2001Based on the $\gamma$-ray data of blazars in the third EGRET catalog and radio data at 5 GHz, we studied the correlation between the radio and $\gamma$-ray luminosities using two statistical methods. The first method was the partial correlation analysis ... More Spontaneous Layer-Pseudospin Domain Walls in Bilayer GrapheneApr 14 2014Bilayer graphene is susceptible to a family of unusual broken symmetry states with spin and valley dependent layer polarization. We report on a microscopic study of the domain walls in these systems, demonstrating that they have interesting microscopic ... More Utility Maximizing Thread Assignment and Resource AllocationJul 04 2015Oct 22 2015Achieving high performance in many distributed systems, ranging from clouds to multicore processors, requires finding good assignments of threads to servers as well as effectively allocating each server's resources to its assigned threads. Both the assignment ... More