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Search Results: 1 - 10 of 43832 matches for " MA She-xiang "
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Research on application of hierarchical reconstructionalgorithm in compressed sensing

CAI Xi,MA She-Xiang,MENG Xin,
蔡 霞
,马社祥,孟 鑫

计算机应用研究 , 2012,
Abstract: In consideration of the issues of the high computation complexity and the weakness performance of traditional algorithm for very large-scale problems in sensor networks, this paper proposed a new method. Hierarchical simultaneous adaptive iterative threshold algorithm allowed reconstructing the optimal sparse signals simultaneously by processing row by row of the compressed signals along the least cost direction. Moreover, with the nonlinearly thresholding function, it was able to fix the reconstruction signals. The extensive experimental results confirm the validity and high performance of the HSAIT algorithm with fewer numbers of measures and iterative, and the signal to noise ratio improves to 60dB.
Multiresolution successive elimination block matching

MA She-xiang,LIU Tie-gen,

计算机应用 , 2006,
Abstract: In order to increase the computational speed of the motion estimation and to improve the image quality of the motion compensation in video coding, a multiresolution successive elimination block - matching algorithm was introduced. In motion estimation, four kinds of resolution are obtained by down sampling of every pixel block. For one match point, if the optimal necessary condition is not satisfied in the lower resolution, then the point will be eliminated by the spatial correlation of pixels, Otherwise, the process is operated in the higher resolution again. By the way, a lot of match points will be eliminated with a few amount of computation. Meanwhile, the idea of NTSS was also used to the multiresolution successive elimination algorithm. Experimental results show that the scheme is effective.
Image Coding and Transport Technique for Internet Based on Multiscale Mean Values and Wavelet Transform
基于多尺度均值和小波变换的Internet图象 可分级压缩编码传输技术

MA She-xiang,LIU Gui-zhong,ZENG Zhao-hua,

中国图象图形学报 , 2000,
Abstract: Images are lifelike, specific and directly perceived through the sense. They contain a great deal of information to be regarded. However, a lot of time is spent on transporting image information, when you scan on Internet for information. This paper introduces a novel image scaling technique by multiscale mean values. The images of various spatial resolution are generated by the mean values of blocks in the original image. Combined with wavelet transform for image layered coding gives high compression ratio and increase flexibility. The speed of information downloaded will be accelerated based on this scheme. It will also be convenience for users.
Recrystallization behavior of Ti40 burn-resistant titanium alloy during hot working process
Yun-jin Lai,She-wei Xin,Ping-xiang Zhang,Yong-qing Zhao,Fan-jiao Ma,Xiang-hong Liu,Yong Feng
- , 2016, DOI: https://doi.org/10.1007/s12613-016-1269-1
Abstract: The recrystallization behavior of deformed Ti40 alloy during a heat-treatment process was studied using electron backscatter diffraction and optical microscopy. The results show that the microstructural evolution of Ti40 alloy is controlled by the growth behavior of grain-boundary small grains during the heating process. These small grains at the grain boundaries mostly originate during the forging process because of the alloy’s inhomogeneous deformation. During forging, the deformation first occurs in the grain-boundary region. New small recrystallized grains are separated from the parent grains when the orientation between deformation zones and parent grains exceeds a certain threshold. During the heating process, the growth of these small recrystallized grains results in a uniform grain size and a decrease in the average grain size. The special recrystallization behavior of Ti40 alloy is mainly a consequence of the alloy’s high β-stabilized elemental content and high solution strength of the β-grains, which partially explains the poor hot working ability of Ti–V–Cr-type burn-resistant titanium alloys. Notably, this study on Ti40 burn-resistant titanium alloy yields important information related to the optimization of the microstructures and mechanical properties.
Multi-objective quality model of SaaS using genetic algorithm optimization

MA Hong-jiang,ZHOU Xiang-bing,SHE Kun,XIE Cheng-jin,

计算机应用研究 , 2011,
Abstract: Abstract:SaaS(software as a service) software based on cloud computing refers to those problems such as uncertainty, dispersibility, difficulty to control in the software generation. Thus, proposed a multi-objective quality model of SaaS based on genertic
Complete stationary surfaces in R^4_1 with total Gaussian curvature 6π
Xiang Ma
Mathematics , 2012,
Abstract: In a previous paper we classified complete stationary surfaces (i.e. spacelike surfaces with zero mean curvature) in 4-dimensional Lorentz space $\mathbb{R}^4_1$ which are algebraic and with total Gaussian curvature $-\int K\mathrm{d}M=4\pi$. Here we go on with the study of such surfaces with $-\int K\mathrm{d}M=6\pi$. It is shown in this paper that the topological type of such a surface must be a M\"obius strip. On the other hand, new examples with a single good singular end are shown to exist.
Adjoint Transform of Willmore Surfaces in $n$-sphere
Xiang Ma
Mathematics , 2005, DOI: 10.1007/s00229-006-0635-0
Abstract: After the surface theory of M\"obius geometry, this study concerns a pair of conformally immersed surfaces in $n$-sphere. Two new invariants $\theta$ and $\rho$ associated with them are introduced as well as the notion of touch and co-touch. This approach is helpful in research about transforms of certain surface classes. As an application, we define adjoint transform for any given Willmore surface in $n$-sphere. It always exists locally (yet not unique in general) and generalizes known duality theorems of Willmore surfaces. This theory on surface pairs reaches its high point by a characterization of adjoint Willmore surfaces in terms of harmonic maps.
Isothermic and S-Willmore Surfaces as Solutions to Blaschke's Problem
Xiang Ma
Mathematics , 2004,
Abstract: We consider the generalization of classical Blaschke's Problem to higher codimension case, characterizing Darboux pair of isothermic surfaces and dual S-Willmore surfaces as the only non-trivial surface pairs that envelop a 2-sphere congruence and conformally correspond to each other. When the sphere congruence is the mean curvature spheres of one envelop surface, it must be a cmc-1 surface in hyperbolic 3-space, or a S-Willmore surface. A study of conformally immersed surface pairs is indicated with discussion on the geometric meaning of new invariants.
Min-cost and max-flow algorithm of network with both node and edge capacity confined

SHE Xiang-yang,

计算机应用研究 , 2010,
Abstract: This paper analyzed the characteristic and type of the min-cost and max-flow algorithm in network, put forward the new min-cost and max-flow algorithm of network with both node and edge capacity confined. It generated the two-objective optimizing model of min-cost and max-flow in network,facing the characteristic of min-cost and max-flow of network with node and edge capacity confined, defined the orientation path and residual network, carried out the new min-cost and max-flow algorithm of network with both node and edge capacity confined, with adjacency matrix to deposit data, being based on feasible flow decompose theorem, by the way of the traversing in data structure. In the end, validated and compared the algorithm by examples. Algorithm testing shows that the new min-cost and max-flow algorithm of network with both node and edge capacity confined is completely feasible and availability.
Sphingosine-1-phosphate (S1P) mediates darkness-induced stomatal closure through raising cytosol pH and hydrogen peroxide (H2O2) levels in guard cells in Vicia faba
YinLi Ma,XiaoPing She,ShuShen Yang
Science China Life Sciences , 2012, DOI: 10.1007/s11427-012-4386-8
Abstract: The role and signaling of sphingosine-1-phosphate (S1P) during darkness-induced stomatal closure were examined in Vicia faba. Darkness substantially raised S1P and hydrogen peroxide (H2O2) levels and closed stomata. These darkness effects were significantly suppressed by DL-threo-dihydrosphingosine (DL-threo-DHS) and N,N-dimethylsphingosine (DMS), two inhibitors of long-chain base kinases. Exogenous S1P led to stomatal closure and H2O2 production, and the effects of S1P were largely prevented by the H2O2 modulators ascorbic acid, catalase, and diphenyleneiodonium. These results indicated that S1P mediated darkness-induced stomatal closure by triggering H2O2 production. In addition, DL-threo-DHS and DMS significantly suppressed both darkness-induced cytosolic alkalization in guard cells and stomatal closure. Exogenous S1P caused cytosolic alkalization and stomatal closure, which could be largely abolished by butyric acid. These results demonstrated that S1P synthesis was necessary for cytosolic alkalization during stomatal closure caused by darkness. Furthermore, together with the data described above, inhibition of darkness-induced H2O2 production by butyric acid revealed that S1P synthesis-induced cytosolic alkalization was a prerequisite for H2O2 production during stomatal closure caused by darkness, a conclusion supported by the facts that the pH increase caused by exogenous S1P had a shorter lag and peaked faster than H2O2 levels and that butyric acid prevented exogenous S1P-induced H2O2 production. Altogether, our data suggested that darkness induced S1P synthesis, causing cytosolic alkalization and subsequent H2O2 production, finally leading to stomatal closure.
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