Qing Qu

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—Pixel-wise classification, where each pixel is assigned to a predefined class, is one of the most important procedures in hyperspectral image (HSI) analysis. By representing a test pixel as a linear combination of a small subset of labeled pixels, a sparse representation classifier (SRC) gives rather plausible results compared with that of traditional(More)
Can we recover a complex signal from its Fourier magnitudes? More generally, given a set of m measurements, y k = |a * k x| for k = 1,. .. , m, is it possible to recover x ∈ C n (i.e., length-n complex vector)? This generalized phase retrieval (GPR) problem is a fundamental task in various disciplines, and has been the subject of much recent investigation.(More)
We consider the problem of recovering the sparsest vector in a subspace S ∈ R p with dim (S) = n. This problem can be considered a homogeneous variant of the sparse recovery problem, and finds applications in sparse dictionary learning, sparse PCA, and other problems in signal processing and machine learning. Simple convex heuristics for this problem(More)
We consider the problem of recovering a complete (i.e., square and invertible) matrix A 0 , from Y ∈ R n×p with Y = A 0 X 0 , provided X 0 is sufficiently sparse. This recovery problem is central to the theoretical understanding of dictionary learning, which seeks a sparse representation for a collection of input signals, and finds numerous applications in(More)
We consider the problem of recovering a complete (i.e., square and invertible) matrix A 0 , from Y ∈ R n×p with Y = A 0 X 0 , provided X 0 is sufficiently sparse. This recovery problem is central to theoretical understanding of dictionary learning, which seeks a sparse representation for a collection of input signals and finds numerous applications in(More)
Triple negative breast cancer (TNBC) is an aggressive subtype of breast cancer that is often associated with a poor prognosis. The aim of our study was to identify biomarkers predictive of TNBC progression. Primary TNBC breast tissue samples including four with metastasis and six without metastasis were subjected to Affymetrix GeneChip® analysis (human(More)