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- 저자 : Miao Tianyu (검색결과 3 건)
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Fuzzy Logic Control Strategy for Parallel Hybrid Excavator
Miao Xu,Dingxuan Zhao,Tianyu Li 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
A 20 t parallel hybrid excavator was applied as the research object in the research. To optimize the fuel economy of the engine and maintain the balanced electric quantity of power batteries simultaneously, a fuzzy logic based strategy was proposed to control the power train of the 20t parallel hybrid excavator. The torque required by the system and the state of charge (SOC) of the capacitor were regarded as the input parameters, while the power partition coefficient K was regarded as the output parameter to design the fuzzy logic controller, so as to optimize the power output of the engine and the motor. The simulation and bench test results demonstrated that the proposed fuzzy logic based control strategy can maintain the balanced electric quantity of the capacitor while controlling the engine to be operated at the optimal output power. Meanwhile, after being optimized by the fuzzy logic, the engine reduced the fuel consumption by 8.06%. Therefore, it is concluded that this strategy is applicable to parallel hybrid excavators, accompanying with significant energy saving effect.
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Large deviations for dependent heavy tailed random variables
Yu Miao,Tianyu Xue,Ke Wang,Fangfang Zhao 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.2
Let {Xn, n ≥ 1} be a stationary sequence of random variables with heavy tails. In this paper,we study the logarithmic asymptotic behaviors for the distributions of the partial sums Sn = ni =1 Xi under the assumption that {Xn, n ≥ 1} is a sequence of dependent random variables. Our main interest is in the crude estimates P(|Sn| > nx) ≈ n−αx+1 for appropriate values x where α is a specific parameter. Some results in this paper extend the works of Hu and Nyrhinen (2004).
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Zhang Lu,Yang Zhi-gang,Xu Huayan,Yang Meng-xi,Xu Rong,Chen Lin,Sun Ran,Miao Tianyu,Zhao Jichun,Zhou Xiaoyue,Fu Chuan,Guo Yingkun 대한영상의학회 2020 Korean Journal of Radiology Vol.21 No.12
Objective: To determine whether T1 mapping could monitor the dynamic changes of injury in myocardial infarction (MI) and be histologically validated. Materials and Methods: In 22 pigs, MI was induced by ligating the left anterior descending artery and they underwent serial cardiovascular magnetic resonance examinations with modified Look-Locker inversion T1 mapping and extracellular volume (ECV) computation in acute (within 24 hours, n = 22), subacute (7 days, n = 13), and chronic (3 months, n = 7) phases of MI. Masson’s trichrome staining was performed for histological ECV calculation. Myocardial native T1 and ECV were obtained by region of interest measurement in infarcted, peri-infarct, and remote myocardium. Results: Native T1 and ECV in peri-infarct myocardium differed from remote myocardium in acute (1181 ± 62 ms vs. 1113 ± 64 ms, p = 0.002; 24 ± 4% vs. 19 ± 4%, p = 0.031) and subacute phases (1264 ± 41 ms vs. 1171 ± 56 ms, p < 0.001; 27 ± 4% vs. 22 ± 2%, p = 0.009) but not in chronic phase (1157 ± 57 ms vs. 1120 ± 54 ms, p = 0.934; 23 ± 2% vs. 20 ± 1%, p = 0.109). From acute to chronic MI, infarcted native T1 peaked in subacute phase (1275 ± 63 ms vs. 1637 ± 123 ms vs. 1471 ± 98 ms, p < 0.001), while ECV progressively increased with time (35 ± 7% vs. 46 ± 6% vs. 52 ± 4%, p < 0.001). Native T1 correlated well with histological findings (R2 = 0.65 to 0.89, all p < 0.001) so did ECV (R2 = 0.73 to 0.94, all p < 0.001). Conclusion: T1 mapping allows the quantitative assessment of injury in MI and the noninvasive monitoring of tissue injury evolution, which correlates well with histological findings.
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