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Chongqing, China

Chongqing University of Posts and Telecommunications is a public university located in China's fourth municipality: Chongqing, which focuses on the research and education in the field of information and communications and enjoys a nation-wide reputation in the study of posts, telecommunications and information technology, especially for its research and commercialization in 3G mobile technologies, optical science and related digital research. It is one of the four Universities of Posts and Telecommunications in China and the only one of its kind in the Southwest China. The university enjoys a very good reputation in the ICT industry in China due to its high quality education and research and the large number of alumni working in the ICT industry. Due to its achievements and contributions in the field of Information and Communications, especially in the development of China's own digital communications systems, CQUPT is considered as the cradle of China's digital communications. Wikipedia.

Zhu W.,Chongqing University of Posts and Telecommunications | Zhu W.,Chinese Academy of Sciences | Cheng D.,Chinese Academy of Sciences
Automatica | Year: 2010

In this paper, a leader-following consensus problem of second-order multi-agent systems with fixed and switching topologies as well as non-uniform time-varying delays is considered. For the case of fixed topology, a necessary and sufficient condition is obtained. For the case of switching topology, a sufficient condition is obtained under the assumption that the total period over which the leader is globally reachable is sufficiently large. We not only prove that a consensus is reachable asymptotically but also give an estimation of the convergence rate. An example with simulation is presented to illustrate the theoretical results. © 2010 Elsevier Ltd. All rights reserved. Source

Cai Y.-F.,Arizona State University | Saridakis E.N.,Chongqing University of Posts and Telecommunications
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

We investigate thermal inflation in double-screen entropic cosmology. We find that its realization is general, resulting from the system evolution from non-equilibrium to equilibrium. Furthermore, going beyond the background evolution, we study the primordial curvature perturbations arising from the universe interior, as well as from the thermal fluctuations generated on the holographic screens. We show that the power spectrum is nearly scale-invariant with a red tilt, while the tensor-to-scalar ratio is in agreement with observations. Finally, we examine the non-Gaussianities of primordial curvature perturbations, and we find that a sizable value of the non-linearity parameter is possible due to holographic statistics on the outer screen. © 2011 Elsevier B.V. Source

Wu J.,Chongqing University of Posts and Telecommunications
International Journal of Digital Content Technology and its Applications | Year: 2012

The problem of evaluating the computer network security with uncertain linguistic information is the multiple attribute group decision making (MAGDM) problems. In this paper, we investigate the multiple attribute group decision making (MAGDM) problems for evaluating the computer network security with uncertain linguistic information. We utilize the uncertain linguistic weighted geometric (ULWG) operator and uncertain linguistic hybrid geometric (ULHG) operator to aggregate and get the overall value of the computer network security, then rank the computer network security and select the most desirable one(s) by using the formula of the degree of possibility for the comparison between two uncertain linguistic variables. Finally, an illustrative example for evaluating the computer network security is given to verify the developed approach and to demonstrate its practicality and effectiveness. Source

Shu F.-W.,Chongqing University of Posts and Telecommunications
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

Based on the finite-temperature AdS/CFT correspondence, we calculate the ratio of shear viscosity to entropy density in any Lovelock theories to any order. Our result shows that any Lovelock correction terms except the Gauss-Bonnet term have no contribution to the value of η / s. This result is consistent with that of Brustein and Medved's prediction. © 2010 Elsevier B.V. All rights reserved. Source

Xiang J.,Chongqing University of Posts and Telecommunications
Optics Express | Year: 2012

Standard FFT-based turbulent phase screen generation method has very large errors due to the undersampling of the low frequency components. Subharmonic methods are the main low frequency components compensating methods to improve the accuracy, but the residual errors are still large. In this paper I propose a new low frequency components compensating method, which is based on the correlation matrix phase screen generation methods. Using this method, the low frequency components can be compensated accurately, both of the accuracy and speed are superior to those of the subharmonic methods. © 2011 Optical Society of America. Source

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