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The RNA exosome is a multisubunit 3' to 5' exoribonuclease complex that participates in degradation and processing of cellular RNA. To determine the activities and structure of the eukaryotic exosome, we report the reconstitution of 9-subunit exosomes from yeast and human and reconstitution of 10- and 11-subunit exosomes from yeast. Comparative biochemical… (More)

- Xiequan Fan, Ion Grama, Quansheng Liu
- 2015

J o u r n a l o f P r o b a b i l i t y Electron. Abstract The paper is devoted to establishing some general exponential inequalities for super-martingales. The inequalities improve or generalize many exponential inequalities of Bennett, Freedman, de la Peña, Pinelis and van de Geer. Moreover, our concentration inequalities also improve some known… (More)

- Zhihua Xia, Xinhui Wang, Xingming Sun, Quansheng Liu, Naixue Xiong
- Multimedia Tools and Applications
- 2014

This paper models the messages embedded by spatial least significant bit (LSB) matching as independent noises to the cover image, and reveals that the histogram of the differences between pixel gray values is smoothed by the stego bits despite a large distance between the pixels. Using the characteristic function of difference histogram (DHCF), we prove… (More)

- Quansheng Liu
- 2008

We first obtain exponential inequalities for martingales. Let (X k)(1 ≤ k ≤ n) be a sequence of martingale differences relative to a filtration (F k), and set Sn = X1 + ... + Xn. We prove that if for some δ > 0, Q ≥ 1, K > 0 and all k, a.s. E[e δ|X k | Q |F k−1 ] ≤ K, then for some constant c > 0 (depending only on δ, Q and K) and all x > 0, P [|Sn| > nx] ≤… (More)

- Haijuan Hu, Jacques Froment, Quansheng Liu
- ArXiv
- 2015

—Patch-based sparse representation and low-rank approximation for image processing attract much attention in recent years. The minimization of the matrix rank coupled with the Frobenius norm data fidelity can be solved by the hard thresholding filter with principle component analysis (PCA) or singular value decomposition (SVD). Based on this idea, we… (More)

- Xue-hai Liang, Qing Liu, Quansheng Liu, Thomas H. King, Maurille J. Fournier
- Nucleic acids research
- 2010

Most small nucleolar RNAs (snoRNAs) guide rRNA nucleotide modifications, some participate in pre-rRNA cleavages, and a few have both functions. These activities involve direct base-pairing of the snoRNA with pre-rRNA using different domains. It is not known if the modification and processing functions occur independently or in a coordinated manner. We… (More)

- Bing Li, Quansheng Liu, Jiawei Xu, Xiaojun Luo
- SCIENCE CHINA Information Sciences
- 2011

Let m ≥ 3 be an integer. The so-called m-ary search tree is a discrete time Markov chain which is very popular in theoretical computer science, modelling famous algorithms used in searching and sorting. This random process satisfies a well-known phase transition: when m ≤ 26, the asymptotic behavior of the process is Gaussian, but for m ≥ 27 it is no longer… (More)

- Qiyu Jin, Ion Grama, Quansheng Liu
- J. Sci. Comput.
- 2014

We propose a new image denoising algorithm when the data is contaminated by a Poisson noise. As in the Non-Local Means filter, the proposed algorithm is based on a weighted linear combination of the observed image. But in contract to the latter where the weights are defined by a Gaussian kernel , we propose to choose them in an optimal way. First some "… (More)

- Xu Li, Xingming Sun, Quansheng Liu
- IEEE Transactions on Image Processing
- 2015

Based on the fixed point theory, this paper proposes a new scheme for image integrity authentication, which is very different from digital signature and fragile watermarking. By the new scheme, the sender transforms an original image into a fixed point image (very close to the original one) of a well-chosen transform and sends the fixed point image (instead… (More)