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Ning Xu [4]Ningsheng Xu [1]Ningning Xu [1]
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  1.  7
    On the Observability of Leader-Based Multiagent Systems with Fixed Topology.Bo Liu, Ningsheng Xu, Housheng Su, Licheng Wu & Jiahui Bai - 2019 - Complexity 2019:1-10.
    This paper investigates the observability of first-order, second-order, and high-order leader-based multiagent systems with fixed topology, respectively. Some new algebraic and graphical characterizations of the observability for the first-order MASs are established based on agreement protocols. Moreover, under the same leader-following framework with the predefined topology and leader assignment, the observability conditions for systems of double-integrator and high-integrator agents are also obtained. Finally, the effectiveness of the theoretical results is verified by numerical examples and simulations.
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    Adaptive Robust Dynamic Surface Integral Sliding Mode Control for Quadrotor UAVs Under Parametric Uncertainties and External Disturbances.Ye Zhang, Ning Xu, Guoqiang Zhu, Lingfang Sun, Shengxian Cao & Xiuyu Zhang - 2020 - Complexity 2020:1-20.
    A robust adaptive fuzzy nonlinear controller based on dynamic surface and integral sliding mode control strategy is proposed to realize trajectory tracking for a class of quadrotor UAVs. In this study, the composite factors including parametric uncertainties and external disturbances are added to controller design, which make it more realistic. The quadrotor model is divided into two subsystems of attitude and position that make the control design become feasible. The main contributions of the proposed ADSISMC strategy are as follows: The (...)
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  3. Effects of Different Degrees of Extraluminal Compression on Hemodynamics in a Prominent Transverse-Sigmoid Sinus Junction.Xiaoyu Qiu, Pengfei Zhao, Zhenxia Mu, Chihang Dai, Xiaoshuai Li, Ning Xu, Heyu Ding, Shusheng Gong, Zhenghan Yang, Bin Gao & Zhenchang Wang - 2022 - Frontiers in Human Neuroscience 16.
    ObjectivesTo simulate hemodynamic changes after extraluminal compression in pulsatile tinnitus patients with a prominent transverse-sigmoid sinus junction.MethodsOne patient-specific case was reconstructed based on computed tomography venography images of a PT patient. The compression degree served as a new index in this study. Cases with 10, 20, 30, 40, 50, 60, 70, 80, and 90% of the compression degree of the control subject were constructed. Steady-state computational fluid dynamics were assessed. The wall pressure distribution, wall maximum pressure and flow pattern of (...)
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    Remedial Teaching and Learning From a Cognitive Diagnostic Model Perspective: Taking the Data Distribution Characteristics as an Example.He Ren, Ningning Xu, Yuxiang Lin, Shumei Zhang & Tao Yang - 2021 - Frontiers in Psychology 12.
    In response to the big data era trend, statistics has become an indispensable part of mathematics education in junior high school. In this study, a pre-test and a post-test were developed for the six attributes of the data distribution characteristic. This research then used the cognitive diagnosis model to learn about the poorly mastered attributes and to verify whether cognitive diagnosis can be used for targeted intervention to improve students' abilities effectively. One hundred two eighth graders participated in the experiment (...)
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  5. Li Xue Yu Xian Dai Xin Ru Xue.Ning Xu - 2011 - Changchun Chu Ban She.
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  6. Liu Yi Yuan Rong: Ma Yifu Wen Hua Zhe Xue Yan Jiu.Ning Xu - 2008 - Zhongguo She Hui Ke Xue Chu Ban She.
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