. This paper is devoted to the event-triggered consensus control for a class of uncertain multiple Euler-Lagrange (EL) systems with actuator faults. Different from the related works where strict conditions are imposed on system uncertainties and the measurements of the leader's output, more serious uncertainties are involved since all the system dynamic matrices are unknown while both actuator faults and external disturbance are considered; and moreover, fewer measurements of the leader's output are required since its time derivatives are not necessarily available for feedback. Mainly because of these, the consensus problem is hard to solve by straightforwardly extending the existing results. To solve the control problem, a dynamic gain with a smart choice of its updating law is introduced to overcome the serious uncertainties and the sampling error of the control signal. By incorporating the dynamic gain into the vectorial backstepping procedure, an adaptive consensus controller joined with an event-triggered mechanism is designed for each follower to ensure the consensus of the multi-agent system in the sense that all the states of the closed-loop system are bounded while the output of each follower tracks the leader's output. Finally, the effectiveness of the proposed method is verified by a simulation example.
以烟台市朝阳街、奇山所城历史街区为例,运用空间句法,选取视觉限定效果、视线整合度和视觉可理解度三项变量,对改造前后的历史街区公共空间吸引力进行量化评价对比分析.结果显示,改造后历史街区公共空间吸引力有所提升,但大部分公共空间的可识别性仍然偏低.
有向图的有向圈码是一个可以控制有向图所有顶点的长度最小的一个有向圈.本文定义了有向图的有向圈码,并且给出了有向圈码和有向图覆盖之间的关系.在凯莱有向图中,研究了一个有向圈是有向圈码的充分必要条件.特别地,在凯莱有向图中,一个循环子群决定一个有向圈码的充分必要条件是这个图的凯莱子集既是这个子群的一个左陪集代表系也是一个右陪集代表系.
研究带有Hardy项和Hardy-Sobolev临界指数项的奇异型椭圆型方程解的存在性,在某些确定的条件下,运用Hardy不等式,Hardy-Sobolev不等式以及变分理论中的山路引理证明了非平凡解的存在性.
提出了一种基于伪标签纠正的半监督深度子空间聚类算法.首先利用少量已知样本标签,对分类层产生的不精确伪标签进行纠正,从而提高伪标签的精确性和稳定性;其次从已知样本标签中获得成对样本信息,通过对比学习对自表达系数矩阵进行约束来提高聚类的性能.在4 个常用数据集上的实验证明,在最多 50 个已知样本标签的情况下,提出的子空间聚类算法性能优于目前先进的子空间聚类算法.
