Creat membership Creat membership
Sign in

Forgot password?

  • Forgot password?
    Sign Up
  • Confirm
    Sign In
home > search

Now showing items 1 - 16 of 17

  • Square-root Lasso with Non-convex Regularization: An ADMM Approach

    Shen, Xinyue   Chen, Laming   Gu, Yuantao   So, Hing Cheung  

    Download Collect
  • Restricted Isometry Property of Subspace Projection Matrix Under Random Compression

    Shen, Xinyue   Gu, Yuantao  

    Structures play a significant role in the field of signal processing. As a representative of structural data, low rank matrix along with its restricted isometry property (RIP) has been an important research topic in compressive signal processing. Subspace projection matrix is a kind of low rank matrix with additional structure, which allows for further reduction of its intrinsic dimension. This leaves room for improving its own RIP, which could work as the foundation of compressed subspace projection matrix recovery. In this work, we study the RIP of subspace projection matrix under random orthonormal compression. Considering the fact that subspace projection matrices of dimensional subspaces in R-N form an s(N - s) dimensional submanifold in R-NxN, our main concern is transformed to the stable embedding of such sub-manifold into R-NxN. The result is that by O(s(N - s) log N) number of random measurements the RIP of subspace projection matrix is guaranteed.
    Download Collect
  • Nonconvex Sparse Logistic Regression With Weakly Convex Regularization

    Shen, Xinyue   Gu, Yuantao  

    Download Collect
  • [IEEE 2017 29th Chinese Control And Decision Conference (CCDC) - Chongqing, China (2017.5.28-2017.5.30)] 2017 29th Chinese Control And Decision Conference (CCDC) - Disciplined multi-convex programming

    Shen, Xinyue   Diamond, Steven   Udell, Madeleine   Gu, Yuantao   Boyd, Stephen  

    Download Collect
  • [IEEE 2016 IEEE 55th Conference on Decision and Control (CDC) - Las Vegas, NV, USA (2016.12.12-2016.12.14)] 2016 IEEE 55th Conference on Decision and Control (CDC) - Disciplined convex-concave programming

    Shen, Xinyue   Diamond, Steven   Gu, Yuantao   Boyd, Stephen  

    Download Collect
  • [IEEE ICASSP 2014 - 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) - Florence, Italy (2014.5.4-2014.5.9)] 2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) - Robust off-grid recovery from compressed measurements

    Shen, Xinyue   Romberg, Justin   Gu, Yuantao  

    Download Collect
  • [IEEE 2015 IEEE Global Conference on Signal and Information Processing (GlobalSIP) - Orlando, FL, USA (2015.12.14-2015.12.16)] 2015 IEEE Global Conference on Signal and Information Processing (GlobalSIP) - Anti-sparse representation for continuous function by dual atomic norm with application in OFDM

    Shen, Xinyue   Gu, Yuantao  

    Download Collect
  • [IEEE ICASSP 2015 - 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) - South Brisbane, Queensland, Australia (2015.4.19-2015.4.24)] 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) - Subspace projection matrix completion on Grassmann manifold

    Shen, Xinyue   Gu, Yuantao  

    Download Collect
  • Square-Root Lasso With Nonconvex Regularization: An ADMM Approach

    Shen, Xinyue   Chen, Laming   Gu, Yuantao   So, H. C.  

    Square-root least absolute shrinkage and selection operator (Lasso), a variant of Lasso, has recently been proposed with a key advantage that the optimal regularization parameter is independent of the noise level in the measurements. In this letter, we introduce a class of nonconvex sparsity-inducing penalties to the square-root Lasso to achieve better sparse recovery performance over the convex counterpart. The resultant formulation is converted to a nonconvex but multiconvex optimization problem, i.e., it is convex in each block of variables. Alternating direction method of multipliers is applied as the solver, according to which two efficient algorithms are devised for row-orthonormal sensing matrix and general sensing matrix, respectively. Numerical experiments are conducted to evaluate the performance of the proposed methods.
    Download Collect
  • Weakly Convex Regularized Robust Sparse Recovery Methods with Theoretical Guarantees

    Yang, Chengzhu   Shen, Xinyue   Ma, Hongbing   Chen, Badong   Gu, Yuantao   So, Hing Cheung  

    Download Collect
  • Linearized ADMM for Nonconvex Nonsmooth Optimization With Convergence Analysis

    Liu, Qinghua   Shen, Xinyue   Gu, Yuantao  

    Download Collect
  • Experimental infection of duck origin virulent Newcastle disease virus strain in ducks.

    Dai, Yabin   Cheng, Xu   Liu, Mei   Shen, Xinyue   Li, Jianmei   Yu, Shengqing   Zou, Jianmin   Ding, Chan  

    BACKGROUND: Newcastle disease (ND) caused by virulent Newcastle disease virus (NDV) is an acute, highly contagious and fatal viral disease affecting most species of birds. Ducks are generally considered to be natural reservoirs or carriers of NDV while being resistant to NDV strains, even those most virulent for chickens; however, natural ND cases in ducks have been gradually increasing in recent years. In the present study, ducks of different breeds and ages were experimentally infected with duck origin virulent NDV strain duck/Jiangsu/JSD0812/2008 (JSD0812) by various routes to investigate the pathogenicity of NDV in ducks.; RESULTS: Six breeds (mallard, Gaoyou, Shaoxing, Jinding, Shanma, and Pekin ducks) were infected intramuscularly (IM) with JSD0812 strain at the dose of 5 * 108 ELD50. Susceptibility to NDV infection among breeds varied, per morbidity and mortality. Mallard ducks were the most susceptible, and Pekin ducks the most resistant. Fifteen-, 30-, 45-, 60-, and 110-day-old Gaoyou ducks were infected with JSD0812 strain at the dose of 5 * 108 ELD50 either IM or intranasally (IN) and intraocularly (IO), and their disease development, viral shedding, and virus tissue distribution were determined. The susceptibility of ducks to NDV infection decreased with age. Most deaths occurred in 15- and 30-day-old ducklings infected IM. Ducks infected IN and IO sometimes exhibited clinical signs, but seldom died. Clinical signs were primarily neurologic. Infected ducks could excrete infectious virus from the pharynx and/or cloaca for a short period, which varied with bird age or inoculation route; the longest period was about 7 days. The rate of virus isolation in tissues from infected ducks was generally low, even in those from dead birds, and it appeared to be unrelated to bird age and infection route.; CONCLUSIONS: The results confirmed that some of the naturally occurring NDV virulent strains can cause the disease in ducks, and that ducks play an important role in the epidemiology of ND. The prevention of NDV spread in ducks should receive more attention and research in terms of preventing the occurrence and prevalence of ND.=20
    Download Collect
  • A Distributed Method for Optimal Capacity Reservation

    Moehle, Nicholas   Shen, Xinyue   Luo, Zhi-Quan   Boyd, Stephen  

    Download Collect
  • Lanosterol Synthase Pathway Alleviates Lens Opacity in Age-Related Cortical Cataract

    Shen, Xinyue   Zhu, Manhui   Kang, Lihua   Tu, Yuanyuan   Li, Lele   Zhang, Rutan   Qin, Bai   Yang, Mei   Guan, Huaijin  

    Purpose. Lanosterol synthase (LSS) abnormity contributes to lens opacity in rats, mice, dogs, and human congenital cataract development. This study examined whether LSS pathway has a role in different subtypes of age-related cataract (ARC). Methods. A total of 390 patients with ARC and 88 age-matched non-ARC patients were enrolled in this study. LSS expression was analyzed by western blot and enzyme-linked immunosorbent assay (ELISA). To further examine the function of LSS, we used U18666A, an LSS inhibitor in rat lens culture system. Results. In lens epithelial cells (LECs), LSS expression in LECs increased with opaque degree C II, while it decreased with opaque degree C IV and C V. While in the cortex of age-related cortical cataract (ARCC), LSS expression was negatively related to opaque degree, while lanosterol level was positively correlated to opaque degree. No obvious change in both LSS and lanosterol level was found in either LECs or the cortex of age-related nuclear cataract (ARNC) and age-related posterior subcapsular cataract (ARPSC). In vitro, inhibiting LSS activity induced rat lens opacity and lanosterol effectively delayed the occurrence of lens opacity. Conclusions. This study indicated that LSS and lanosterol were localized in the lens of human ARC, including ARCC, ARNC, and ARPSC. LSS and lanosterol level are only correlated with opaque degree of ARCC. Furthermore, activated LSS pathway in lens is protective for lens transparency in cortical cataract.
    Download Collect
  • The Mycoplasma gallisepticum alpha-enolase is cell surface-exposed and mediates adherence by binding to chicken plasminogen

    Chen, Hongjun   Yu, Shengqing   Shen, Xinyue   Chen, Danqing   Qiu, Xvsheng   Song, Cuiping   Ding, Chan  

    The alpha-enolase protein is reported to be an adhesin in several pathogenic bacterial species, but its role in Mycoplasma gallisepticum is unknown. In this study, the M. gallisepticum alpha-enolase gene was adapted to heterologous expression in Escherichia coli by performing overlapping polymerase chain reaction with site-directed mutagenesis to introduce A960G and A1158G mutations in the nucleotide sequence. The full-length mutated gene was cloned into a pGEM-T Easy vector and subcloned into the expression vector pET32a(+) to construct the pET-rMGEno plasmid. The expression of rMGEno in E. coli strain DE3 was confirmed by sodium dodecyl sulfate polyacrylamide gel electrophoresis with Coomassie blue staining. Purified rMGEno exhibited alpha-enolase catalytic activity that it could reflect the conversion of NADH to NAD(+). Mouse antiserum to alpha-enolase was generated by immunization with rMGEno. Immunoblotting and immunofluorescence assay with the antiserum identified alpha-enolase on the surface of M. gallisepticum cells. Enzyme-linked immunosorbent assay characterized rMGEno as a chicken plasminogen binding protein. An adherence inhibition assay on immortalized chicken fibroblasts (DF-1) demonstrated more than 77% inhibition of adhesion in the presence of mouse antiserum, suggesting that alpha-enolase of M. gallisepticum participates in bacterial adhesion to DF-1 cells. (C) 2011 Elsevier Ltd. All rights reserved.
    Download Collect
  • Time-Varying Graph Signal Reconstruction

    Qiu, Kai   Mao, Xianghui   Shen, Xinyue   Wang, Xiaohan   Li, Tiejian   Gu, Yuantao  

    Signal processing on graphs is an emerging research field dealing with signals living on an irregular domain that is captured by a graph, and has been applied to sensor networks, machine learning, climate analysis, etc. Existing works on sampling and reconstruction of graph signals mainly studied static bandlimited signals. However, many real-world graph signals are time-varying, and they evolve smoothly, so instead of the signals themselves being bandlimited or smooth on graph, it is more reasonable that their temporal differences are smooth on graph. In this paper, a new batch reconstruction method of time-varying graph signals is proposed by exploiting the smoothness of the temporal difference signals, and the uniqueness of the solution to the corresponding optimization problem is theoretically analyzed. Furthermore, driven by practical applications faced with real-time requirements, huge size of data, lack of computing center, or communication difficulties between two nonneighboring vertices, an online distributed method is proposed by applying local properties of the temporal difference operator and the graph Laplacian matrix. Experiments on a variety of synthetic and real-world datasets demonstrate the excellent performance of the proposed methods.
    Download Collect
1 2


If you have any feedback, Please follow the official account to submit feedback.

Turn on your phone and scan

Submit Feedback