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Search Results: 1 - 10 of 89552 matches for " BAO Wei-jun "
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Center for East-West Medicine at University of California at Los Angeles
Wei-jun ZHANG
Zhong Xi Yi Jie He Xue Bao , 2008,
The development and current status of integrative medicine at UCLA
Wei-Jun Zhang
Zhong Xi Yi Jie He Xue Bao , 2012,
Geometric flows on warped product manifold
Wei-Jun Lu
Mathematics , 2012, DOI: 10.11650/tjm.17.2013.2549
Abstract: We derive one unified formula for Ricci curvature tensor on arbitrary warped product manifold by introducing a new notation for the lift vector and the Levi-Civita connection.This formula is helpful to further consider Ricci flow (RF) and hyperbolic geometric flow (HGF) and evolution equations on warped product manifold. We characterize the behavior of warping function under RF and under HGF. Simultaneously, we give some simple examples to illustrate the existence of such warping function solution. In addition, we also gain the evolution equations for metrics and Ricci curvature on a general warped product manifold and specific warped product manifold whose second factor manifold is of Einstein metric.
Evolution equations of curvature tensors along the hyperbolic geometric flow
Wei-Jun Lu
Mathematics , 2012, DOI: 10.1007/s11401-014-0861-9
Abstract: We consider the hyperbolic geometric flow $\frac{\partial^2}{\partial t^2}g(t)=-2Ric_{g(t)}$ introduced by Kong and Liu [KL]. When the Riemannian metric evolve, then so does its curvature. Using the techniques and ideas of S.Brendle [Br,BS], we derive evolution equations for the Levi-Civita connection and the curvature tensors along the hyperbolic geometric flow. The method and results are computed and written in global tensor form, different from the local normal coordinate method in [DKL1]. In addition, we further show that any solution to the hyperbolic geometric flow that develops a singularity in finite time has unbounded Ricci curvature.
On $f$-bi-harmonic maps between Riemannian manifolds
Wei-Jun Lu
Mathematics , 2013, DOI: 10.1007/s11425-015-4997-1
Abstract: Both bi-harmonic map and $f$-harmonic map have nice physical motivation and applications. In this paper, by combination of these two harmonic maps, we introduce and study $f$-bi-harmonic maps as the critical points of the $f$-bi-energy functional $\frac{1}{2}\int_M f|\tau (\phi)|^2dv_{g}$. This class of maps generalizes both concepts of harmonic maps and bi-harmonic maps. We first derive the $f$-biharmonic map equation and then use it to study $f$-bi-harmonicity of some special maps, including conformal maps between manifolds of same dimensions, some product maps between direct product manifold and singly warped product manifold, some projection maps from and some inclusion maps into a warped product manifold.
Security scheme for wireless sensor networks

ZHAO Yong-an,WANG Fu-bao,DUAN Wei-jun,

计算机应用研究 , 2007,
Abstract: This paper introduced a security scheme for wireless sensor networks, it not only provided general security ways, but also offered secure in-network processing to prolong the lifetime of WSNs and probabilistic multi-path redundancy transmission to identify the malicious nodes.
Encryption scheme supporting secure in-network processing for WSNs

ZHAO Yong-an,WANG Fu-bao,DUAN Wei-jun,

计算机应用研究 , 2007,
Abstract: With the rapid development of wireless sensor networks, security mechanisms become more critical for the operation of many sensor applications. Based on learning the existing security schemes, an encryption scheme supporting secure in-network processing for wireless sensor networks was introduced. It offers semantic security, data authentication, data integrity and freshness. Besides, by this scheme the lifetime of wireless sensor network was prolonged.
Recent developments in biomedicine fields for laser induced breakdown spectroscopy  [PDF]
Xian-Yun Liu, Wei-Jun Zhang
Journal of Biomedical Science and Engineering (JBiSE) , 2008, DOI: 10.4236/jbise.2008.13024
Abstract: Laser induced breakdown spectroscopy (LIBS) can be used to determine solid, liquid, colloi-dal, and biological samples. It is a promising technique for analysis and characterization of the composition of a broad variety of objects. This review describes in brief the basic prin-ciples and technological aspects of LIBS, and the most recent progress of the various ap-plications of this technique in biomedicine fields will be reviewed in detail, including bio-aerosols detection and identification, tis-sue analysis, mineral analysis in human body, and detection of zinc in human skin. Finally new approaches and the prospects in bio-medicine fields of LIBS technique are de-scribed.
RTP Encapsulation Technology of MPEG-4 and Its Application

HUANG Jia-chuan,WANG Fu-bao,DUAN Wei-jun,

计算机应用研究 , 2005,
Abstract: The rapid development of broadband network is seeing broad prospectine for the network streaming media applications.With the high compress rate,high mutual ability and flexible scalable ability,MPEG-4 has a bright future for use in network streaming media.Makes a deep research on the technology fo RTP encapsulation of MPEG-4,the key issues of the application of MPEG-4 network streaming media,and apply them to the system of video on demand.
Research on pair-wise synchronization algorithms of wireless sensor networks

CHENG Li-juan,WANG Fu-bao,DUAN Wei-jun,

计算机应用研究 , 2007,
Abstract: Four typical pair-wise synchronization algorithms were discussed and analyzed in detail.Finally,recommendations for future study and possible improvements were discussed.
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