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RISS 인기검색어
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- 저자 : Yuezhi, Xiong (검색결과 3 건)
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The Cultural Difference between Beijing and Shanghai and Its Influence on New Culture Movement
Yuezhi, Xiong East-Asian Society for Urban History 2019 Journal of east-asian urban history Vol.1 No.-
The New Culture Movement marked the dawning of a turbulent era in China. By the time of May Fourth Movement, the cultural contradiction and confliction grew into an extensive and enduring social movement extending deep and far-reaching influence on the Chinese society. The huge difference and contradiction existing between the Beijing and Shanghai cultures contributed to the outbreak of this social movement. To be specific, there was an active human and information exchange involving the two leading Chinese cities and at the same time the old and new cultures, thoughts and moralities constantly acted upon each other.
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A new method of multi-scale fracture identification in tight gas sandstone reservoir
Tao Wu,Yuezhi Wang,Bin Fu,Peng Wu 한국자원공학회 2019 Geosystem engineering Vol.22 No.2
Identification of fractures is an important guide for the selection of well location as well as improvement of single-well recovery. In this paper, large-scale fractures of Su 48 block (target well) located in Sulige gas field were predicted using the coherence, curvature and anti-tracking analysis while small-fractures prediction were performed using R/S fractal statistical method. The observations revealed that, development of large-scale fractures were not that significant, whilst those of a smaller scale were distributed across the near-wellbore formation constituted of mudstone. Moreover, predicted results using the multi-scale fusion fracture developed model showed good agreement of the existence of fractures during horizontal well drilling in real time. Furthermore, the predicted fractures matched well with those observed in the field. Hence, reflecting the significance of tight gas sandstone reservoir fracture identification method.
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Adaptive Fault-tolerant Control for Mechanical Manipulator Systems with Actuator Fault
Yong Chen,Bin Guo,Yuezhi Liu,Ke Zhang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.7
In this paper, the tracking control problem of a class of mechanical manipulator system with actuator fault and mismatched disturbance is investigated. An observer-based adaptive fast finite-time sliding mode fault-tolerant control (OB-AFTSMFTC) scheme is proposed. Firstly, a novel composite observer is designed to estimate the state, fault efficiency factor, and disturbance simultaneously without the disturbance bound information. It is theoretically proved that the entire observer system is globally stable. To address the tracking performance, the Euler’s discretization technique is applied to approximate the discrete-time tracking error model. Subsequently, an OB-AFTSMFTC strategy is proposed based on the tracking error. In the proposed control scheme, two adaptive parameters are designed to realize the autonomous adjustment of controller parameters, thus the work of parameter adjustment can be reduced and a faster convergence can be achieved. Furthermore, the estimated disturbance information is utilized to construct the sliding mode controller in order to improve the robustness of the tracking performance. Finally, two simulation cases are carried out to verify the fault tolerance ability of the proposed method.
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