oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2017 ( 106 )

2016 ( 135 )

2015 ( 1527 )

2014 ( 2468 )

自定义范围…

匹配条件: “TIAN Guo-liang” ,找到相关结果约60580条。
列表显示的所有文章,均可免费获取
第1页/共60580条
每页显示
A Survey Design for a Sensitive Binary Variable Correlated with Another Nonsensitive Binary Variable
Jun-Wu Yu,Yang Lu,Guo-Liang Tian
Journal of Probability and Statistics , 2013, DOI: 10.1155/2013/827048
Abstract: Tian et al. (2007) introduced a so-called hidden sensitivity model for evaluating the association of two sensitive questions with binary outcomes. However, in practice, we sometimes need to assess the association between one sensitive binary variable (e.g., whether or not a drug user, the number of sex partner being ?1 or >1, and so on) and one nonsensitive binary variable (e.g., good or poor health status, with or without cervical cancer, and so on). To address this issue, by sufficiently utilizing the information contained in the non-sensitive binary variable, in this paper, we propose a new survey scheme, called combination questionnaire design/model, which consists of a main questionnaire and a supplemental questionnaire. The introduction of the supplemental questionnaire which is indeed a design of direct questioning can effectively reduce the noncompliance behavior since more respondents will not be faced with the sensitive question. Likelihood-based inferences including maximum likelihood estimates via the expectation-maximization algorithm, asymptotic confidence intervals, and bootstrap confidence intervals of parameters of interest are derived. A likelihood ratio test is provided to test the association between the two binary random variables. Bayesian inferences are also discussed. Simulation studies are performed, and a cervical cancer data set in Atlanta is used to illustrate the proposed methods. 1. Introduction Warner [1] introduced a randomized response technique to obtain truthful answers to questions with sensitive attributes. Using the Warner design, Kraemer [2] derived a bivariate correlation between an attribute with polytomous responses and an attribute with normally distributed responses. Fox and Tracy [3] derived estimation of the Pearson product moment correlation coefficient between two sensitive questions by assuming that randomized response observations can be treated as individual-level scores that are contaminated by random measurement error. Edgell et al. [4] considered the correlation between two sensitive questions using the unrelated question design or the additive constants design. Christofides [5] presented a randomized response technique with two randomization devices to estimate the proportion of individuals having two sensitive characteristics at the same time. Kim and Warde [6] considered a multinomial randomized response model which can handle untruthful responses. They also derived the Pearson product moment correlation estimator which may be used to quantify the linear relationship between two variables when
Cotton Field Microwave Scattering Research
棉田微波散射研究

PAN Guang-Dong,TIAN Guo-Liang,
潘广东
,田国良

遥感学报 , 1999,
Abstract: The research on crops microwave scattering model is developing fast. But, the integrated study of both volume and surface model is still in the beginning stage in China. This paper applies the combined model to the cotton-soil media and conducts some exploring works. Microwave scattering in cotton-soil media has been calculated from zero, first to second order scattering. The paper analyses major factors which affect the backscattering coefficient. Some valuable conclusions have been drawn. Among these, the incident wave frequency and cotton leaf radius are the major factors. For cotton field scattering in small incident angles (<30°), the major scattering is from soil surface, when the incident angle is more than 30°, the major scattering is from cotton canopy. It may be helpful for cotton mi- crowave remote sensing monitoring and discrimination.
Adaptive control and synchronization of an uncertain new hyperchaotic Lorenz system

Cai Guo-Liang,Zheng Song,Tian Li-Xin,

中国物理 B , 2008,
Abstract: This paper is involved with the adaptive control and synchronization problems for an uncertain new hyperchaotic Lorenz system. Based on the Lyapunov stability theory, the adaptive control law is derived such that the trajectory of hyperchaotic Lorenz system with unknown parameters can be globally stabilized to an unstable equilibrium point of the uncontrolled system. Furthermore, an adaptive control approach is presented to the synchronizations between two identical hyperchaotic systems, particularly between two different uncertain hyperchaotic systems. Numerical simulations show the effectiveness of the presented method.
A new hyperchaotic system and its linear feedback control

Cai Guo-Liang,Zheng Song,Tian Li-Xin,

中国物理 B , 2008,
Abstract:
Nonlinear feedback control of a novel hyperchaotic system and itscircuit implementation

Wang Hao-Xiang,Cai Guo-Liang,MiaoSheng,Tian Li-Xin,

中国物理 B , 2010,
Abstract: This paper reports a new hyperchaotic system by adding an additional state variable into a three-dimensional chaotic dynamical system. Some of its basic dynamical properties, such as the hyperchaotic attractor, Lyapunov exponents, bifurcation diagram and the hyperchaotic attractor evolving into periodic, quasi-periodic dynamical behaviours by varying parameter k are studied. An effective nonlinear feedback control method is used to suppress hyperchaos to unstable equilibrium. Furthermore, a circuit is designed to realize this new hyperchaotic system by electronic workbench (EWB). Numerical simulations are presented to show these results.
Towards detailed tomography of high energy heavy-ion collisions by $\gamma$-jet
Ma, Guo-Liang
High Energy Physics - Phenomenology , 2013,
Abstract: Within a multi-phase transport (AMPT) model with string melting scenario, the transverse momentum imbalance between prompt photon and jet is studied in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. Jet losses its energy from by $\sim$15% in central collisions to by $\sim$ 5% in peripheral collisions due to strong interactions between jet and partonic matter, which is much higher than those from hadronic interactions only. The final hadronic interactions have little influence on the imbalance. The imbalance ratio, $x_{j\gamma}$, is sensitive to both production position and passing direction of $\gamma$-jet, which could enable a detail $\gamma$-jet tomographic study on the formed partonic matter by selecting different $x_{j\gamma}$ ranges experimentally. It is proposed that $\gamma$-hadron azimuthal correlation associated with photon+jet is a good probe to see the medium response to different $\gamma$-jet production configurations.
Di-jet asymmetry in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV with a multiphase transport model
Ma, Guo-Liang
High Energy Physics - Phenomenology , 2013,
Abstract: Within a multi-phase transport (AMPT) model, di-jet asymmetry is studied in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. It has been found that a large di-jet asymmetry ($A_{J}$) is produced by strong interactions between jets and partonic matter rather than by hadronic interactions only, since jets loss much more energy via partonic interactions than with hadronic interactions. It is demonstrated that the final hadronic processes such as hadronization and hadronic rescatterings have little effects on the di-jet asymmetry owning to jet partonic energy loss. The asymmetry evolution function, final $A_{J}$ as a function of initial $A_{J}$ and jet energy loss, discloses that final di-jet asymmetry is driven by both initial di-jet asymmetry and partonic jet energy loss, which is consistent with an increasing jet energy loss in a hot and strongly interacting partonic medium in more central Pb+Pb collisions.
Medium modifications of photon-tagged jet fragmentation function in high-energy heavy-ion collisions
Guo-Liang Ma
Physics , 2013, DOI: 10.1103/PhysRevC.89.064909
Abstract: Based on a multiphase transport model, medium modifications of prompt photon-tagged jet fragmentation function are investigated by comparing prompt photon-tagged hadron azimuthal correlation in Au+Au collisions (0-40\%) with that in p+p collisions at $\sqrt{s_{_{\rm NN}}}$ = 200 GeV. The measured modification factor, $I_{AA}$, increases with the increasing integration range of the away side, which reveals a medium-modified jet shape in which the medium enhancement of soft particles is preferentially located far away from the jet axis. The $I_{AA}$ largely results from strong interactions between jets and partonic matter. However, both hadronization of coalescence and hadronic rescatterings play certain roles to modify the $I_{AA}$. These behaviors reflect a dynamical evolution of modifications of the prompt photon-tagged jet fragmentation function in high-energy heavy-ion collisions.
Towards detailed tomography of high energy heavy-ion collisions by $γ$-jet
Guo-Liang Ma
Physics , 2013, DOI: 10.1016/j.physletb.2013.06.029
Abstract: Within a multi-phase transport (AMPT) model with string melting scenario, the transverse momentum imbalance between prompt photon and jet is studied in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. Jet loses more energy in more central collisions due to strong partonic interactions between jet parton shower and partonic matter, which is more significant than due to hadronic interactions only. The hadronization and final-state hadronic interactions have little influences on the imbalance. The imbalance ratio $x_{j\gamma}$ is sensitive to both production position and passing direction of $\gamma$-jet, which provides an opportunity to do detail $\gamma$-jet tomography on the formed partonic matter by selecting different $x_{j\gamma}$ ranges. It is also proposed that $\gamma$-hadron azimuthal correlation associated with photon+jet is a probe to see the medium responses to different $\gamma$-jet production configurations.
Medium modifications of jet shapes in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV within a multiphase transport model
Guo-Liang Ma
Physics , 2013, DOI: 10.1103/PhysRevC.89.024902
Abstract: Within a multiphase transport model, medium modifications of differential jet shapes are investigated in Pb+Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV. The differential jet shapes are significantly modified by the strong interactions between jets and a partonic medium in Pb+Pb collisions relative to that in p+p collisions. The modifications are slightly weakened by the hadronization of coalescence, but strengthened by resonance decays in hadronic rescatterings. Subleading jets display larger medium modifications than leading jets, especially in central Pb+Pb collisions with large dijet asymmetries. These behaviors of medium modifications of differential jet shapes reflect a dynamical evolution of redistribution of jet energy inside a quenched jet cone in high-energy heavy-ion collisions.
第1页/共60580条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.