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Articles by Hao Wu
Total Records ( 6 ) for Hao Wu
  Hao Wu , Peter Berg and Xianguo Li
  A 3D model that fully couples multi-species and multi-phase transport, electrochemical kinetics, and heat transfer processes has been developed. The non-equilibrium membrane water absorption/desorption processes along with non-equilibrium condensation/evaporation processes have been investigated utilizing this comprehensive model. In addition, the fallacious assumption that water is produced in vapor phase during the half cell electrochemical reaction is addressed for the first time. The difference and relationship of the cell output current density among three water production mechanisms are exhibited to show the potential error induced by vapor or liquid production assumptions. The present model is capable of predicting transient phenomena within the cell as well. Our results show that compared to the liquid production modeling the dynamic response of PEM fuel cells in vapor production modeling is significantly overestimated owing to the sluggish condensation process.
  Xianyong Fang and Hao Wu
  This study presents an efficient multi-resolution method to detect binary object directly. Both intensity and geometry differences are used to measure the similarity between the source object template and target objects inside the test image. Especially for the geometrical difference, the histogram of oriented gradients is proposed to measure the similarity of the edge images between the source object template and the target object. Based on these two measurements, a multi-resolution strategy is used to accurately locate the object position in a coarse-to-fine way, where intensity difference and geometry difference applied consequently in each layer. Experimental results demonstrate the efficiency of the proposed method.
  Xianyong Fang , Hao Wu , Zhongbiao Wu and Bin Luo
  Linear motion blur estimation is widely studied in the ill-posed deblur related research, but existing methods are too complex, inaccurate or unstable. This study proposes an improved method with two novel contributions to former frequency based method. One is a novel preprocessing step consisting of Hann windowing and histogram equalization. Hann windowing is used to remove the boundary artifacts in the log spectrum while histogram equalization is used to enhance the contrast of the log spectrum. The other is an improved Hough transform based method to estimate the blur direction with cepstrum which eliminates the effect of noise. The method incorporates a least squares line fitting into the traditional Hough transform, and thus accurately estimates the direction. Experimental results demonstrate the efficiency of the proposed method.
  Dengyin Zhang , Hao Wu and Chunling Chen
  This study puts forward a new algorithm with double R-tree (DR-tree) in order to solve the issues caused by tremendous data size, namely, deepening depth of R-tree, increasingly large occupied space and low query efficiency. This study gives out the data structure, as well as the algorithm of insert, index and delete. According to the experiments, DR-tree will supply higher efficiency at the expense of slightly more occupied space. Moreover, the more the index objectives, the better retrieval performance can be delivered.
  Qing Ma , Yujun Liu , Zhaohui Peng , Hao Wu and Kezhu Zhao
  In order to solve the manual banding problem of a strip steel end, an automatic control system of bundling strip based on machine vision is designed. The communication between PC and SIEMENS PLC is the key to the implementation of the entire system. By programming the communications procedures provided by VB communication controls, we can monitor and manage strip end bundling process effectively. Many experiments have been done and the results proved that, compared with professional control configuration software, VB development has the advantages of low cost, versatility, high efficiency of communication and meeting the requirements of accuracy and reliability.
  Wei Feng , Hao Wu , Ling-Nga Chan and Mingjie Zhang
  PDZ domain-containing scaffold protein Par-3 is the central organizer of the evolutionarily conserved cell polarity-regulatory Par-3·Par-6·atypical protein kinase C complex. The PDZ domains of Par-3 have also been implicated as potential phosphoinositide signaling integrators, since its second PDZ domain binds to phosphoinositides, and the third PDZ interacts with phosphoinositide phosphatase PTEN. However, the molecular basis of Par-3/PTEN interaction is still poorly understood. Additionally, it is not known whether the regulatory function of PTEN in cell polarity is specifically mediated by its interaction with Par-3. The structures of Par-3 PDZ3 in both its free and PTEN tail peptide-bound forms determined in this work reveal that Par-3 PDZ3 binds to PTEN with two discrete binding sites: a canonical PDZ-ligand interaction site and a distal, opposite charge-charge interaction site. This distinct target recognition mechanism confers the interaction specificity of the Par-3·PTEN complex. We show that the Par-3 PDZ3-PTEN binding is required for the enrichment of PTEN at the junctional membranes of Madin-Darby canine kidney cells. Finally, we demonstrate that the junctional membrane-localized PTEN is specifically required for the polarization of Madin-Darby canine kidney cells. These results, together with earlier data, firmly establish that Par-3 functions as a scaffold in integrating phosphoinositide signaling events during cellular polarization.
 
 
 
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