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Articles by Ming Zhang
Total Records ( 7 ) for Ming Zhang
  Zheng Zhu , Dong-Xiao Li and Ming Zhang
  A general methodology for performance modeling and optimization of hierarchical B pictures used in video coding is proposed in this study. First, an approach of directed tree decomposition is used to denote hierarchical B pictures. In combination with a proposed linear model for compression efficiency, the performance of any hierarchical B prediction structure can be evaluated conveniently from the directed tree. Then with a dynamic programming method, the optimal tree for any group length of hierarchical B pictures can be set up elegantly from recursive subtrees. This method can be adapted to tradeoff between compression efficiency and random access ability. Besides, experimental results show that the optimal tree of compression efficiency achieves higher performance than the existing hierarchical B prediction structures.
  Li Yao , Dong-Xiao Li and Ming Zhang
  Dense depth maps provide significant geometry information for 3D video and free viewpoint video systems. Traditional stereo correspondence methods usually deal with each stereo image pair separately. As a result, the generated depth sequence is temporally inconsistent. This paper presented a novel approach to recover spatio-temporally consistent depth maps. The proposed method first applied sequential belief propagation algorithm to achieve an approximate minimum of spatial energy on Markov random fields. Then in temporal domain, a smoothness cost along optical flow was incorporated between consecutive frames. The combined cost which determined the disparity value was passed forward and temporal consistency was enforced during the process. In addition, the streamlined implementation was time and memory efficient. In experimental validation, quantitative evaluation as well as subject assessment was performed on several test datasets. The results showed that the proposed method yielded temporally consistent depth sequence and reduced flickering artifacts in the synthesized view while maintaining visual quality.
  Lingshan Liu , Ming Xi , Dong-Xiao Li and Ming Zhang
  Precision of depth has a significant impact on quality of virtual view synthesis in 3DTV system. Artifacts exist in stereo correspondence. Object boundary artifact is one of the most difficult problems. The object boundary pixels receive colors from both foreground and background thus leads to wrong mapping. The occlusion fill-up process causes object boundary expansion which makes boundary pixels unreliable. We propose a boundary matting technique based on natural image matting algorithms to calculate the alpha value of the boundary pixels. Depth values which are suggested by alpha values can be recalculated. The limitation of matting algorithms is that they define only boundaries between two layers and cannot solve the multiple-layer definition problem. Our contribution is the localized methods of boundary matting which can solve the multiple layer boundaries in complex depth map. Our goal is superior view synthesis from stereo, thus the quality of virtual views are valued in experiments. The result shows that our technique reduces the boundary artifacts effectively.
  Weiyan Xu , Min Wei , Ming Zhang and Xibei Yang
  In the incomplete decision information systems, based on similarity relation, the concept of similarity and dissimilarity knowledge is firstly proposed. By the basic knowledge granule, two kinds of rough set model are defined and their properties are discussed. In these rough set models, based on similarity and dissimilarity knowledge, an approach is presented to acquire the positive and negative decision rules, respectively. The certainty factor is introduced to measure their certainty degree. Finally, to simplify these decision rules, this study introduces the heuristic algorithm of the attribute reduction based on the significant attributes and analyzes an illustrative example to prove its effectiveness.
  Jia Yao , Ming Zhang , Yu-Mei Feng , Si-Yi Chen , Wei Wang , Jie Wang and Song-Jia Lai
  Interferon-tau (IFN-τ) secreted by blastular trophectoderm was thought to be the primary signal for pregnancy recognition during bovine early pregnancy period after pregnancy recognition, progesterone dominated pregnancy maintaining. Moreover, Matrix Metalloproteinases-2 (MMP-2) and Tissue Inhibitor of Metalloproteinases-2 (TIMP-2) was important for embryo implantation. The objectives of studies were evaluated whether IFN-τ and progesterone regulated MMP-2 and TIMP-2 expression in cultured bovine Endometrial Cells (bECs). In the studies, bECs were cultured in DMEM-Ham’s F12 medium with free-serum. These cultured cells were divided into 4 groups and cultured in four types culture medium: culture medium without IFN-τ and progesterone (Co group); culture medium including 100 ng mL-1 IFN-τ (IN group); culture medium including 200 nmol L-1 progesterone (Pr group); culture medium including 100 ng mL-1 IFN-τ and 200 nmol L-1 progesterone (I+P group). Cultured bECs were harvested and extracted total mRNA after being cultured for 1, 3, 6 and 12 h and then expression level of MMP-2 and TIMP-2 were assessed with fluorescence quantitative PCR. The results showed that MMP-2 expression level in Pr, IN and I+P group were extremely significantly higher than in Co group (p<0.01). MMP-2 expression level in IN and I+P group was significantly higher than in Pr group (p<0.05). MMP-2 expression level was no statistical difference between IN group and I+P group (p>0.05); TIMP-2 expression level in Pr, IN and I+P group was extremely significantly lower than in Co group (p<0.01) and TIMP-2 expression level was no statistical difference among Pr, IN and I+P group (p>0.05). The conclusion indicated progesterone and IFN-τ induced MMP-2 expression in vitro cultured bECs whereas, progesterone and IFN-τ suppressed TIMP-2 expression in vitro cultured bECs.
  Ming Zhang and Yong Hang
  The controller’s performance directly affects the safety and the efficiency of ATC at any moment. It’s a reasonable and feasible method to get the sorting results of the different planning schemes through the assessment of the sector controller workload. However, all planning schemes can not be implemented until it passed the practice test for the first-line controller. This study brings forward integrated evaluation of the controller’s workload based on improved integrated evaluation model which combines the quantitative and the qualitative analysis. The condition set is constructed and the correlation value of the sample with practical data is calculated. The correlation function and the weight function are built. By the calculated value, the category is selected. The sample in the terminal control area of Shanghai confirms that the method is feasible.
  Ming Zhang and Patrick C. Swanson
  V(D)J recombination is a process integral to lymphocyte development. However, this process is not always benign, since certain lymphoid malignancies exhibit recurrent chromosomal abnormalities, such as translocations and deletions, that harbor molecular signatures suggesting an origin from aberrant V(D)J recombination. Translocations involving LMO2, TAL1, Ttg-1, and Hox11, as well as a recurrent interstitial deletion at 1p32 involving SIL/SCL, are cited examples of illegitimate V(D)J recombination. Previous studies using extrachromosomal substrates reveal that cryptic recombination signal sequences (cRSSs) identified near the translocation breakpoint in these examples support V(D)J recombination with efficiencies ranging from about 30- to 20,000-fold less than bona fide V(D)J recombination signals. To understand the molecular basis for these large differences, we investigated the binding and cleavage of these cRSSs by the RAG1/2 proteins that initiate V(D)J recombination. We find that the RAG proteins comparably bind all cRSSs tested, albeit more poorly than a consensus RSS. We show that four cRSSs that support levels of V(D)J recombination above background levels in cell culture (LMO2, TAL1, Ttg-1, and SIL) are also cleaved by the RAG proteins in vitro with efficiencies ranging from 18 to 70% of a consensus RSS. Cleavage of LMO2 and Ttg-1 by the RAG proteins can also be detected in cell culture using ligation-mediated PCR. In contrast, Hox11 and SCL are nicked but not cleaved efficiently in vitro, and cleavage at other adventitious sites in plasmid substrates may also limit the ability to detect recombination activity at these cRSSs in cell culture.
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