Hubei University of Arts and Science

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Xiangyang, China
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Yin X.,Huazhong University of Science and Technology | Yue D.,Nanjing University of Posts and Telecommunications | Hu S.,Hubei University of Arts and Science
Journal of the Franklin Institute | Year: 2013

This paper investigates the consensus problem for a set of discrete-time heterogeneous multi-agent systems composed of two kinds of agents differed by their dynamics. The consensus control is designed based on the event-triggered communication scheme, which can lead to a significant reduction of the information communication burden in the multi-agent network. Meanwhile, only the communication between the agent and its local neighbors is needed, therefore, the designed control is essentially distributed. Based on the Lyapunov functional method and the Kronecker product technique, a sufficient condition is obtained to guarantee the consensus of heterogeneous multi-agent systems in terms of linear matrix inequality (LMI). Simulation results illustrate the effectiveness of the developed theory in the last.


Lei L.,Xiangyang Central Hospital | Huang Y.,Xiangyang Central Hospital | Gong W.,Hubei University of Arts and Science
Oncology Reports | Year: 2013

Non-small cell lung cancer (NSCLC) is one of the most common causes of cancer-related mortality worldwide. microRNAs (miRNAs) play critical roles in carcinogenesis. miR-205 has been shown to be upregulated in NSCLC. In the present study, we identified the promotive effects of miR-205 on various significant biological properties of NSCLC cells, and confirmed the regulation of PTEN by miR-205. The expression of miR-205 was examined by quantitative real-time PCR both in NSCLC cell lines and tissues. The effect of miR-205 on PTEN expression was assessed in NSCLC cell lines with miR-205 mimics/inhibitor to elevate/decrease miR-205 expression. Furthermore, the roles of miR-205 in regulating the biological properties of NSCLC cells, including growth, invasion and chemoresistance, were assayed using miR-205 mimic/inhibitor-transfected cells. The 3′-untranslated region (3′-UTR) of PTEN combined with miR-205 and this was confirmed by luciferase reporter assay and western blotting. miR-205 expression was increased in NSCLC cell lines as well as in tissues. Overexpression of miR-205 promoted growth, migration and invasion, and enhanced the chemoresistance of NSCLC cells. Luciferase activity and western blotting demonstrated that miR-205 negatively regulated PTEN at a posttranscriptional level. However, miR-205 knockdown suppressed these processes in A549 cells and increased the expression of PTEN protein. Furthermore, overexpression of PTEN exhibited effects identical with those of the miR-205 inhibitor in NSCLC cells. Our results demonstrated that miR-205 is involved in the tumorigenesis of NSCLC through modulation of the PTEN signaling pathway.


Lei L.,Xiangyang Central Hospital | Huang Y.,Xiangyang Central Hospital | Gong W.,Hubei University of Arts and Science
Molecular and Cellular Biochemistry | Year: 2014

microRNAs play critical roles in the progression and metastasis of nonsmall cell lung cancer (NSCLC). miR-92b acts as an oncogene in some malignancies; however, its role in NSCLC remains poorly understood. Here, we found that miR-92b was significantly increased in human NSCLC tissues and cell lines. Inhibition of miR-92b remarkably suppressed cell proliferation, migration, and invasion of NSCLC cells. Reversion-inducing-cysteine-rich protein with kazal motifs (RECK) was identified to be a target of miR-92b. Expression of miR-92b was negatively correlated with RECK in NSCLC tissues. Collectively, miR-92b might promote NSCLC cell growth and motility partially by inhibiting RECK. © 2013 Springer Science+Business Media New York.


Xie X.D.,Hubei University of Arts and Science | Xie X.D.,University of Manitoba | Wang Q.,University of Manitoba | Wu N.,University of Manitoba
International Journal of Engineering Science | Year: 2014

An ocean wave energy harvester from the transverse wave motion of water particles is developed by the piezoelectric effects. The harvester is made of two horizontal cantilever plates attached by piezoelectric patches and fixed on a vertical rectangular column. To describe the energy harvesting process, a mathematical model is developed to calculate the output charge and voltage from the piezoelectric patches according to the Airy linear wave theory and the elastic beam model. The influences on the root mean square (RMS) of the generated power from the piezoelectric patches, such as the ocean depth, the harvester location under the ocean surface, the length of the cantilevers, the wave height, and the ratio of wave length to ocean depth, are discussed. Results show that the RMS increases with the increase in the length of cantilevers and the wave height, and decrease in the distance of the ocean surface to the cantilevers and the ratio of the wave length to ocean depth. As a result, an optimum ocean depth is obtained to achieve a maximum RMS at different harvester locations under the ocean surface. A value of the power up to 30 W can be realized for a practical transverse wave with the values of the ocean depth, wave length, wave height and harvester location under the ocean surface to be 10.6 m, 21.2 m, 4 m, and -2 m, respectively. This research develops a novel technique leading to efficient and practical energy harvesting from transverse waves by piezoelectric energy harvesters that could be easily fixed on an offshore platform. © 2014 Elsevier Ltd. All rights reserved.


Xie X.D.,Hubei University of Arts and Science | Wang Q.,University of Manitoba | Wu N.,University of Manitoba
International Journal of Engineering Science | Year: 2014

A ring piezoelectric harvester excited by magnetic forces with high excitation frequencies is developed. The harvester is made of a concentric outer ring stator and an inner ring rotator. The stator ring is made of a series of discrete piezoelectric patches with a rectangular shape surface mounted by magnetic ring slabs with the same size. All the piezoelectric patches and the magnetic slabs are placed on an aluminum ring. The rotator ring is made of a serious of magnetic rectangular slabs mounted on an aluminum ring with the exact size of the corresponding piezoelectric patches on the stator. Because of periodic magnetic forces between the stator ring and the rotator ring, a compression is induced to the piezoelectric patches leading to an electric charge for energy harvesting. To describe the energy harvesting process, a mathematical model is used to calculate the output charge and voltage from the piezoelectric patches. The influences of the size of the piezoelectric harvester and the rotating speed of the rotator ring on the root mean square of the generated electric power are discussed. Our results show that a power up to 5274.8 W can be realized for a practical design of the harvester with a radius around 0.5 m. This research develops a novel technique for an efficient and practical energy harvesting from the developed ring piezoelectric energy harvesters. © 2014 Elsevier Ltd. All rights reserved.


Yin X.,Huazhong University of Science and Technology | Hu S.,Hubei University of Arts and Science
Asian Journal of Control | Year: 2013

This paper is devoted to the consensus protocol design for a set of agents with fractional-order uncertainty dynamics where the fractional order α satisfies 0 < α < 2. For multi-agent systems (MASs) with fixed undirected topology, a distributed static output feedback protocol is proposed with an undetermined system matrix. Based on model transformation and fractional-order stability theory, sufficient conditions are derived to ensure the consensus of MASs in terms of linear matrix inequalities (LMIs). Finally, a simulation example is employed to validate the effectiveness of the proposed consensus protocol. © 2013 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society.


Yin X.,Huazhong University of Science and Technology | Yue D.,Huazhong University of Science and Technology | Hu S.,Hubei University of Arts and Science
IET Control Theory and Applications | Year: 2013

This study is devoted to the consensus protocols design for a set of fractional-order heterogeneous agents, which is composed of two kinds of agents differed by their dynamics and the fractional-order a satisfies 0 < α < 2. Distributed state feedback consensus protocols are constructed for the two kinds of agents, respectively. Based on the Kronecker product technique and the fractional-order stability theory, sufficient conditions are derived to ensure the consensus of heterogeneous multi-agent systems in terms of linear matrix inequalities (LMIs). These can be solved numerically by LMI toolbox in Matlab. Finally, a simulation example is employed to validate the effectiveness of the theoretical results. © The Institution of Engineering and Technology 2013.


Cui P.,Hubei University of Arts and Science | Liang Y.,Hubei University of Arts and Science
Solid State Ionics | Year: 2013

The cathode-active materials LiMn2O4LiZn 0.05Mn1.95O4(PO4)x (x = 0, 0.025, 0.05) were synthesized via traditional solid state reaction. Ball milling technique and citric acid additive were employed to obtain the as-prepared products with nanoscaled particles, which were characterized by various methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and charge-discharge studies. Doping the Mn spinel with Zn2 + ions can increase the overall Mn oxidation state and minimize Jahn-Teller distortion. It is shown that LiZn0.05Mn1.95O 3.96(PO4)0.025 and LiZn0.05Mn 1.95O3.99 samples have almost identical discharge capacities of about 114 mAh·g- 1 in the first cycle and the capacity retention rate of LiZn0.05Mn1.95O 3.96(PO4)0.025 is superior to that of LiZn 0.05Mn1.95O3.99 and the undoped LiMn 2O4. The results demonstrate that doped zinc and phosphate can stabilize the structural integrity of the spinel host by suppressing the Jahn-Teller distortion and also provide short distance for Li+ diffusion upon cycling. © 2013 Published by Elsevier B.V.


Zhang M.,Hubei University of Arts and Science
Mathematical Problems in Engineering | Year: 2014

This paper investigates the problems of finite-time stability and finite-time stabilization for nonlinear quadratic systems with jumps. The jump time sequences here are assumed to satisfy some given constraints. Based on Lyapunov function and a particular presentation of the quadratic terms, sufficient conditions for finite-time stability and finite-time stabilization are developed to a set containing bilinear matrix inequalities (BLIMs) and linear matrix inequalities (LMIs). Numerical examples are given to illustrate the effectiveness of the proposed methodology. © 2014 Minsong Zhang.


Hu S.,Hubei University of Arts and Science | Yin X.,Huazhong University of Science and Technology | Zhang Y.,China Three Gorges University | Tian E.G.,Nanjing Normal University
IET Control Theory and Applications | Year: 2012

In this study, event-triggered guaranteed cost control problem for discrete-time networked control systems (NCSs) with parameter uncertainties and time-varying transmission delays is studied. First, an event-triggering scheme for discrete-time NCSs is proposed. Then by using a delay system approach, a unified model of event-triggered control systems with parameter uncertainties and state delay is established. By applying Laypunov functional method together with linear matrix inequality (LMI) technique, sufficient conditions for the existence of an admissible guaranteed cost controller are established, which ensure a specific quadratic cost function has an upper bound for all admissible uncertainties. The proposed stability and stabilisation conditions are formulated in the framework of LMIs, which can be solved efficiently by using existing optimisation techniques. Finally, a numerical example and a practical example are given to demonstrate that, under the proposed event-triggering scheme, the advantage of reducing communication traffic in a control network without compromising the stability of the closed-loop system is preserved. © 2012 The Institution of Engineering and Technology.

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