Wuhan University of Science and Technology is a public, comprehensive, research university located in Wuhan, the capital of Hubei province, China. It is a key university co-administered by the Chinese Ministry of Education and Hubei province. Wikipedia.
Li F.,Wuhan University of Science and Technology
International Journal of Sensor Networks | Year: 2011
In this paper, the uplink scenario of multi-user cooperative network is considered, in which the resource is allocated to the users with the balance of the trade-off between system capacity and user fairness. Proportional fairness was considered, which imposed a set of nonlinear constraints into the optimisation problem. We show that the optimisation problem is formulated as a mixed binary integer programming problem, which is hard to find the global optimum in terms of computational complexity. For practise implementation, we decomposed the optimisation problem into two sub-problems of opportunistic relaying strategy and power allocation. First, the opportunistic relay selection strategy is given by making use of the equivalent channel power gain. Second, a low-complexity power allocation scheme is proposed. The simulation result shows that the proposed scheme can both improve the system throughput and ensure the fairness. © 2011 Inderscience Enterprises Ltd.
Lu J.-D.,Wuhan University of Science and Technology
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2010
We report on a theoretical study of spin-dependent electron transport in a magnetic nanostructure with the δ-doping. It is revealed that the transmission probability, the electron conductance and the spin-polarization obviously depend on the weight of the δ-doping. It is also revealed that the transmission probability and the spin-polarization (PT) both show a periodic profile with the increase of the length L2. These interesting phenomena will be more helpful for understanding the experimental physical phenomena in δ-doping and for making new types of devices. © 2010.
Deng C.,Wuhan University of Science and Technology
Journal of Alloys and Compounds | Year: 2013
Monophase Al4O4C ceramic powder was synthesized using a mixture of a-alumina, carbon black and aluminum powders as raw materials. The effects of different starting compositions and raw materials ratio on the phase transformation and micromorphology of Al4O4C were investigated. The results indicated that a-alumina, carbon black and aluminum powders was more appropriate as raw materials, and 20 mol% excess of aluminum resulted in single phase Al4O4C. Al2OC would occur if excessive carbon black was used. The Al content was found to have a significant effect on the microstructure of synthesized Al4- O 4C. Al4O4C added to the MgO-C refractory initially reacts with CO to form Al2O3 and C. After the reaction, the formed Al2O3 will further react with MgO to form MgAl2O4. The above reaction processes can form protective layers on the surfaces of the refractories, which inhibit the oxidation of the refractories. © 2013 Elsevier B.V. All rights reserved.
Ye H.,Wuhan University of Science and Technology
Zeitschrift fur Angewandte Mathematik und Physik | Year: 2015
In this paper, we study the existence of critical points for the following functional constrained on (Formula Presented.),where N = 1, 2, 3 and a, b > 0 are constants. The constraint problem is L2-critical. We showed that I(u) has a constraint critical point with a mountain pass geometry on Sc if (Formula Presented.), where Q is the unique positive radial solution of (Formula Presented.), I(u) has no critical point on Sc, and we proved the existence of minimizers for a new perturbation functional on Sc:(Formula Presented.). © 2014, Springer Basel.
Fang Y.,Wuhan University of Science and Technology
Advances in Information Sciences and Service Sciences | Year: 2011
In this paper, we investigate the multiple attribute group decision making (MAGDM) problems for for evaluating the E-commerce risk with uncertain linguistic information. We utilize the uncertain linguistic weighted averaging (ULWA) operator to aggregate the uncertain linguistic information corresponding to each alternative and get the overall value of the alternatives, then rank the alternatives 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 is given.