2篇
您的检索式：作者名="Qiyou Cheng"
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| 1 | Ensemble kernel method:SVM classification based on game theory显示文摘With the development of the support vector machine(SVM),the kernel function has become one of the cores of the research on SVM.To a large extent,the kernel function determines the generalization ability of the classifier,but there is still no general theory to guide the choice and structure of the kernel function.An ensemble kernel function model based on the game theory is proposed,which is used for the SVM classification algorithm.The model can effectively integrate the advantages of the local kernel and the global kernel to get a better classification result,and can provide a feasible way for structuring the kernel function.By making experiments on some standard datasets,it is verified that the new method can significantly improve the accuracy of classification. | Yufei Liu Dechang Pi Qiyou Cheng | 2016 | Journal of Systems Engineering and Electronics2016，27，1： | 6 |
| 2 | Numerical Simulation of Aerodynamic Characteristics of Helicopter Rotor with Tip Slots显示文摘Effects of tip slots on the aerodynamic characteristics of helicopter rotor were investigated numerically by solving three-dimensional Navier-Stokes equations based on unstructured overset grids algorithm.Improved delayed detached eddy simulation (IDDES) based on the Spalart-Allmaras turbulence model and adaptive grid refinement technique were employed.Several slots in the rotor blade tip were designed on the base of Caradonna-Tung rotor to study the effect of tip slots.Numerical results show that tip slots are able to introduce the airflow from the leading edge and turn it in the spanwise direction to be ejected out of the face at the rotor blade tip,which can reduce the strength of the rotor blade tip vortex and accelerate the dissipation process.Although tip slots may lead to the decrease of airfoils' lift coefficient at the root of the rotor blade,it can increase the lift coefficient of airfoils at the rotor blade tip,so the lift of the rotor with tip slots is almost the same as that of the rotor without tip slots.In addition,tip slots can also reduce the intensity of the tip shock wave,which is beneficial to reduce the wave drag of the rotor. | Chen Rongqian Wang Xu Cheng Qiyou Zhu Chengxiang You Yancheng | 2018 | Transactions of Nanjing University of Aeronautics and Astronautics2018，35，6： | 1 |
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