South Central University for Nationalities is a national university located in Hubei province's capital Wuhan, directly under the State Ethnic Affairs Commission of PRC. It is a comprehensive university founded in 1951 and the former name was South Central College for Nationalities . In March 2002, the school adopted the current name. As one of the six national higher education institutes for ethnic groups in China, SCUN is committed to innovation in higher education for ethnic groups and thus has achieved a rapid and comprehensive development. Everyone in SCUN, led by a wise and united leadership, is making great effort for the comprehensive development of the school to improve its teaching and learning conditions, enhance its education quality, construct a harmonious campus and ultimately make SCUN an outstanding university for ethnic groups with its own distinguishing features. SCUN is well on its way to a better future. Wikipedia.
Wei Z.,South-Central University for Nationalities
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2011
Based on Sprott D system, a simple three-dimensional autonomous system with no equilibria is reported. The remarkable particularity of the system is that there exists a constant controller, which can adjust the type of chaotic attractors. It is demonstrated to be chaotic in the sense of having a positive largest Lyapunov exponent and fractional dimension. To further understand the complex dynamics of the system, some basic properties such as Lyapunov exponents, bifurcation diagram, Poincaré mapping and period-doubling route to chaos are analyzed with careful numerical simulations. © 2011 Elsevier B.V. All rights reserved.
Zhu R.,South-Central University for Nationalities
International Journal of Distributed Sensor Networks | Year: 2012
Event query processing is a very important issue in wireless sensor networks (WSNs). In order to detect event early and provide monitoring information and event query timely in WSNs, an efficient intelligent collaborative event query (ICEQ) algorithm is proposed, in which sensor nodes that are near to the boundary of events are selected to accomplish complex event monitoring and query processing through intelligent collaboration. ICEQ will select range-nearest neighbors as the basic components of surrounding nodes. Then it will identify the gaps between the surrounding nodes and try to select the nearest neighbor collaborative nodes for enclosing the event in the node selection phase, which can avoid redundant sensor nodes to join surrounding nodes via identifying a set of association surrounding nodes between the nearest sensor nodes and the query events. Detailed experimental results and comparisons with existed algorithm show that the proposed ICEQ algorithm can achieve better performance in terms of query-processing time, average number of selected collaborative nodes, and query message consumption. © 2012 Rongbo Zhu.
Han D.,South-Central University for Nationalities |
Shi L.,Hong Kong University of Science and Technology
Automatica | Year: 2013
We consider the problem of guaranteed cost control (GCC) of affine nonlinear systems in this paper. Firstly, the general affine nonlinear system with the origin being its equilibrium point is represented as a linear-like structure with state-dependent coefficient matrices. Secondly, partition of unity method is used to approximate the coefficient matrices, as a result of which the original affine nonlinear system is equivalently converted into a linear-like system with modeling error. A GCC law is then synthesized based on the equivalent model in the presence of modeling error under certain error condition. The control law ensures that the system under control is asymptotically stable as well as that a given cost function is upper-bounded. A suboptimal GCC law can be obtained via solving an optimization problem in terms of linear matrix inequality (LMI), in stead of state-dependent Riccati equation (SDRE) or Hamilton-Jacobi equations that are usually required in solving nonlinear optimal control problems. Finally, a numerical example is provided to illustrate the validity of the proposed method. © 2012 Elsevier Ltd. All rights reserved.
You Z.Z.,South-Central University for Nationalities |
Hua G.J.,South-Central University for Nationalities
Journal of Alloys and Compounds | Year: 2012
Thin films of transparent conducting gallium-doped zinc oxide (GZO) were deposited by magnetron sputtering technique onto glass substrates. The films were characterized by various methods to understand their microstructural, optical and electrical characteristics. The effects of substrate temperature on the physical properties of the films were investigated. The results show that the GZO films are polycrystalline in nature having a hexagonal wurtzite type crystal structure with a preferred grain orientation in the (0 0 2) direction. The substrate temperature significantly affects the crystal structure and optoelectrical properties of the films. The GZO film grown at the substrate temperature of 670 K has the largest crystal grain, the lowest resistivity and the highest figure of merit. Meanwhile, the optical constants, dielectric function and dissipation factor of the films were determined using the methods of Manifacier and Swanepoel. The dispersion behavior of the refractive index was studied in terms of the single-oscillator Wemple-DiDomenico (W-D) model, and the oscillator parameters of the films were achieved. Furthermore, the optical energy gaps were calculated by W-D model and Tauc's relation, respectively, and the values obtained from W-D model are in agreement with those determined from the Tauc's relation. © 2012 Elsevier B.V. All rights reserved.
Chang Q.,South-Central University for Nationalities |
Tang H.,South-Central University for Nationalities
Microchimica Acta | Year: 2014
Fe3O4 nanoparticles were deposited on sheets of graphene oxide (GO) by a precipitation method, and glucose oxidase (GOx) was then immobilized on this material to produce a GOx/Fe3O4/GO magnetic nanocomposite containing crosslinked enzyme clusters. The 3-component composite functions as a binary enzyme that was employed in a photometric method for the determination of glucose and hydrogen peroxide where the GOx/Fe3O4/GO nanoparticles cause the generation of H2O2 which, in turn, oxidize the substrate N,N-diethyl-p-phenylenediamine to form a purple product with an absorption maximum at 550 nm. The absorbance at 550 nm can be correlated to the concentration of glucose and/or hydrogen peroxide. Under optimized conditions, the calibration plot is linear in the 0.5 to 600 μM glucose concentration range, and the detection limit is 0.2 μM. The respective plot for H2O2 ranges from 0.1 to 10 μM, and the detection limit is 0.04 μM. The method was successfully applied to the determination of glucose in human serum samples. The GOx/Fe3O4/GO nanoparticles are reusable. [Figure not available: see fulltext.] © 2014 Springer-Verlag Wien.