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Motion Control of Autonomous Vehicles with Guaranteed Prescribed Performance
Hongyang Xia,Jiqing Chen,Fengchong Lan,Zhaolin Liu 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.6
In this paper, a novel motion control scheme with guaranteed prescribed performance is proposed for autonomous vehicles with consideration of couplings between lateral and longitudinal motions. Firstly, a prescribed performance transformation function is constructed to equivalently release the output error constraints. Then, a coordinated controller is designed to complete lateral and longitudinal motion control tasks simultaneously based on sliding-mode control. The designed coordinated controller can guarantee predefined trajectory tracking performance (e.g., minimum speed of convergence, maximum steady state error and overshoot), in presence of strongcoupled characteristics, model uncertainties and external disturbance. Finally, simulation results under different boundary constraints further validate the feasibility and good robustness of the controller.
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A Novel Double Layer Cantilevers Harvester for Vibration Energy
Chen Xiaojie,Qiu Chengjun,Qu Wei,Liu Yibo,Xia Hongyang 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.8
This paper reported a double layer cantilever harvester powered for vibration energy. A space layer between the PZT beam and the support silicon beam is existed, leading to the double layer cantilever structure. Such structure can allow the more strain generated by the piezoelectric layer due to the existing of space layer, and the output voltage is further increased. The formula of output voltage is then derived from the piezoelectric effect equation and vibration model. And the formula verifies the relationship of voltage and structure parameter. And the simulation in micrometer lever is used to discuss the relationship. Finally, the prototype is assembled and measured to verify the feature of the device. Experimentally, the 3.8V output voltage and 16.9uW output power is acquired.
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Ginsenosides as dietary supplements with immunomodulatory effects: a review
Tang Ping,Liu Sitong,Zhang Junshun,Ai Zhiyi,Hu Yue,Cui Linlin,Zou Hongyang,Li Xia,Wang Yu,Nan Bo,Wang Yuhua 한국응용생명화학회 2024 Applied Biological Chemistry (Appl Biol Chem) Vol.67 No.-
Immune disorders have become one of the public health problems and imposes a serious economic and social burden worldwide. Ginsenosides, the main active constituents of ginseng, are regarded as a novel supplementary strategy for preventing and improving immune disorders and related diseases. This review summarized the recent research progress of ginsenosides in immunomodulation and proposed future directions to promote the development and application of ginsenosides. After critically reviewing the immunomodulatory potential of ginsenosides both in vitro and in vivo and even in clinical data of humans, we provided a perspective that ginsenosides regulated the immune system through activation of immune cells, cytokines, and signaling pathways such as MAPK, PI3K/ Akt, STAT, and AMPK, as well as positively affected immune organs, gut flora structure, and systemic inflammatory responses. However, the evidence for the safety and efficacy of ginsenosides is insufficient, and the immune pathways of ginsenosides remain incompletely characterized. We believe that this review will provide a valuable reference for further research on ginsenosides as dietary supplements with immunomodulatory effects.
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