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\fancyhead[CO]{\songti\zihao{5} \leftmark}%奇数
\fancyhead[CE]{\songti\zihao{5} 两类控制数研究}%偶数
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	\section{www}
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	\begin{itemize}
		\item [[]]
		A hierarchical control structure is proposed due to the cascade property between translational and rotational system.       
		\item [[2]]
		Compared with the conventional asymptotic stability controller, the proposed finite - time output feedback controllers can provided faster convergence rates, better disturbance rejection property for trajectory tracking control of the quadrotor UAV in the presence of external disturbances and parametric uncertainties. 
		\item [[3]]
		Based on finite - time convergent observer, in stead of sensors, such that efficiently decreases the cost and the complexity of the quadrotor UAV system.
	\end{itemize}
	\subsection{subsection2}
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