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Search Results: 1 - 10 of 74991 matches for " Xiao Xu "
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Constrain-based analysis of gene deletion on the metabolic flux redistribution of Saccharomyces Cerevisiae  [PDF]
Zi-Xiang Xu, Xiao Sun
Journal of Biomedical Science and Engineering (JBiSE) , 2008, DOI: 10.4236/jbise.2008.12020
Abstract: Based on the gene-protein-reaction (GPR) model of S. cerevisiae_iND750 and the method of constraint-based analysis, we first calculated the metabolic flux distribution of S. cere-visiae_iND750. Then we calculated the deletion impact of 438 calculable genes, one by one, on the metabolic flux redistribution of S. cere-visiae_iND750. Next we analyzed the correlation between v (describing deletion impact of one gene) and d (connection degree of one gene) and the correlation between v and Vgene (flux sum controlled by one gene), and found that both of them were not of linear relation. Furthermore, we sought out 38 important genes that most greatly affected the metabolic flux distribution, and determined their functional subsystems. We also found that many of these key genes were related to many but not several subsystems. Because the in silico model of S. cere-visiae_iND750 has been tested by many ex-periments, thus is credible, we can conclude that the result we obtained has biological sig-nificance.
Large-scale Surveillance System based on Hybrid Cooperative Multi-Camera Tracking  [PDF]
Xiao Yan, Dan Xu, Bo Yao
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31B016
Abstract: In this paper, we proposed an optimized real-time hybrid cooperative multi-camera tracking system for large-scale au-tomate surveillance based on embedded smart cameras including stationary cameras and moving pan/tilt/zoom (PTZ) cameras embedded with TI DSP TMS320DM6446 for intelligent visual analysis. Firstly, the overlapping areas and projection relations between adjacent cameras' field of view (FOV) is calculated. Based on the relations of FOV ob-tained and tracking information of each single camera, a homography based target handover procedure is done for long-term multi-camera tracking. After that, we fully implemented the tracking system on the embedded platform de-veloped by our group. Finally, to reduce the huge computational complexity, a novel hierarchical optimization method is proposed. Experimental results demonstrate the robustness and real-time efficiency in dynamic real-world environ-ments and the computational burden is significantly reduced by 98.84%. Our results demonstrate that our proposed sys-tem is capable of tracking targets effectively and achieve large-scale surveillance with clear detailed close-up visual features capturing and recording in dynamic real-life environments.
Pontryagin’s Maximum Principle for a Advection-Diffusion-Reaction Equation  [PDF]
Youjun Xu, Cuie Xiao, Hui Zhu
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.312258
Abstract: In this paper we investigate optimal control problems governed by a advection-diffusion-reaction equation. We present a method for deriving conditions in the form of Pontryagin’s principle. The main tools used are the Ekeland’s variational principle combined with penalization and spike variation techniques.
J/psi Production in an Equilibrating Partonic System
xu, Xiao-Ming
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/S0375-9474(99)00350-4
Abstract: Any color singlet or octet ccbar pair is created at short distances and then expands to a full size of J/psi. Such a dynamical evolution process is included here in calculations for the J/psi number distribution as a function of transverse momentum and rapidity in central Au-Au collisions at both RHIC and LHC energies. The ccbar pairs are produced in the initial collision and in the partonic system during the prethermal and thermal stages through the partonic channels ab to ccbar [{2S+1}L_J] and ab to ccbar [{2S+1}L_J]x, and then they dissociate in the latter two stages. Dissociation of ccbar in the medium occurs via two reactions: (a) color singlet ccbar plus a gluon turns to color octet ccbar, (b) color octet ccbar plus a gluon persists as color octet. There are modest yields of ccbar in the prethermal stage at RHIC energy and through the reactions ab to ccbar [{2S+1}L_J] at LHC energy for partons with large average momentum in the prethermal stage at both collider energies and in the thermal stage at LHC energy. Production from the partonic system competes with the suppression of the initial yield in the deconfined medium. Consequently, a bulge within -1.5
Early thermalization of quark-gluon matter by elastic 3-to-3 scattering
Xu, Xiao-Ming
High Energy Physics - Phenomenology , 2013,
Abstract: The early thermalization is crucial to the quark-gluon plasma as a perfect liquid and results from many-body scattering. We calculate squared amplitudes for elastic parton-parton-parton scattering in perturbative QCD. Transport equations with the squared amplitudes are established and solved to obtain the thermalization time of initially produced quark-gluon matter and the initial temperature of quark-gluon plasma. We find that the thermalization times of quark matter and gluon matter are different.
Research and Analysis on the Reconfigurable System
LIU Guangzhong,XU Xiao
Lecture Notes in Engineering and Computer Science , 2008,
Abstract:
Combination of Model Checking and Theorem Proving to Develop and Verify Embedded Software
Zhong Xu,Xiao Jianyu
Information Technology Journal , 2008,
Abstract: A strategy of combining Model checking and theorem proving techniques to develop and verify high confidence embedded software was proposed. First, the UML state machine of software model was transformed into the input modeling language of model checker MOCHA and the model was analyzed in the model checking tool with associated property specifications expressed in temporal logic. The model checker can give counterexamples if it decided that the model can not satisfy any of the specified properties, which can be used to modify the software`s UML design model. The UML model which has been verified by MOCHA was then transformed into abstract specifications of theorem prover Atelier-B, in which the model would be refined, verified and translated into source C code. The transformation rules from UML state machine to REACTIVE MODULES and to B abstract machines were given. The experiment showed that the proposed strategy can effectively improve the development and verification of high-confidence embedded software.
The Necessity of Anti-Piracy and Anti-Monopoly in Software Industry
Jingfeng Meng,Xu Xiao
International Journal of Business and Management , 2009,
Abstract: The piracy and monopoly in the software industry is analyzed in this article which shows that they will ultimately endanger the national industry but not the foreign monopoly enterprises. The author considers that the low price of the pirated software and the internets monopoly form are the two reasons to form monopoly. Anti-pirate and anti-monopoly are both imperative ways to develop Chinese software industry. A general strategy regulation in the software industry elicited by this article is to strike piracy in the protected period, shorten moderately protection period of the software product and limit the monopoly manufacturers to some extent.
Analysis of Teacher Talk on the Basis of Relevance Theory
Xiao-hui XU
Canadian Social Science , 2010,
Abstract: Teacher talk is usually viewed as one of the decisive factors of success or failure in classroom teaching. Based on the basic principles of Relevance Theory, the present thesis has focused on the teacher-student interaction in form of question-answer in language classrooms and tried to analyze teacher talk under the framework of Relevance Theory to prove that Relevance Theory is able to provide an explanation for teacher talk. This thesis proposes some pedagogical implications for successful teacher talk and teacher-student interaction in EFL context. Keywords: teacher talk; teacher-student interaction; Relevance Theory Résumé: Le discours de l'enseignant est généralement considéré comme l'un des facteurs décisifs de succès ou d'échec dans l'enseignement en classe. Basée sur des principes élémentaires de théorie de la pertinence, la présente thèse a mis l'accent sur l'interaction enseignant-élève sous forme de question-réponse dans les cours de langue et tenté d'analyser les discours de l'enseignant dans le cadre de la théorie de la pertinence afin de prouver que la théorie de la pertinence est capable de fournir une explication pour le discours de l'enseignant. Cette thèse propose quelques implications pédagogiques pour les discours de l'enseignant et de l'interaction enseignant-élève réussis dans le contexte de EFL. Mots-clés: discours de l'enseignant; interaction enseignant-élève; théorie de la pertinence
Advances of Medical Treatment in Advanced Non-small Cell Lung Cancer in 2011 American Society of Clinical Oncology Annual Meeting
Xiao XU,Jinghui WANG
Chinese Journal of Lung Cancer , 2011, DOI: 10.3779/j.issn.1009-3419.2011.12.08
Abstract:
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