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He Pengpeng,Li Ziru,Liu Qian,Zhang Xiaowang,He Wei 대한조선학회 2023 International Journal of Naval Architecture and Oc Vol.15 No.-
The Large Eddy Simulation (LES) method coupled with a Schnerr and Sauer cavitation model was adopted to simulate the unsteady cavitating flow around a Delft Twist 11 (Twist11) hydrofoil. We proposed a novel aggressiveness indicator to predict the risk of cavitation erosion on the hydrofoil surface by utilizing LES simulations as input. The proposed aggressiveness indicator introduces the time-averaged pressure, the hypotheses of Nohmi et al. and the concept of the power exponent into the energy balance approach. The results show that the current numerical method integrally reproduces the evolution of the cloud cavity observed in the cavitation tunnel. The cavitation erosion risk predicted by the aggressiveness indicator Ce1D 0 n¼5 agrees well with the erosion pattern obtained from the paint test. The predicted erosion risk regions are located in the “hoof” positions (region 2 and region 3) of the horse-shoe-shaped cloudy cavity and the positions (region 1) near the cavity closure line.
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Zhipeng Liu,Lichun Li,Ziru Zheng 한국전자통신연구원 2019 ETRI Journal Vol.41 No.5
For dual‐channel time‐frequency (TF) overlapped signals with low sparsity in underdetermined blind source separation (UBSS), this paper proposes an effective method based on interval probability to estimate and expand the types of mixing matrices. First, the detection of TF single‐source points (TF‐SSP) is used to improve the TF sparsity of each source. For more distinguishability, as the ratios of the coefficients from different columns of the mixing matrix are close, a local peak‐detection mechanism based on interval probability (LPIP) is proposed. LPIP utilizes uniform subintervals to optimize and classify the TF coefficient ratios of the detected TF‐SSP effectively in the case of a high level of TF overlap among sources and reduces the TF interference points and redundant signal features greatly to enhance the estimation accuracy. The simulation results show that under both noiseless and noisy cases, the proposed method performs better than the selected mainstream traditional methods, has good robustness, and has low algorithm complexity.
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Yanqing Wang,Zhongying Qi,Ziru Li,Lijie Zhang 서울대학교 교육연구소 2011 Asia Pacific Education Review Vol.12 No.4
Engineering education has been well implemented in the majority of developed countries such as the USA, Germany, and the United Kingdom so that the gap between engineering science and engineering practice is greatly bridged. However, in China, the gap still exists, and some attempts by Chinese government, even though having made obvious progress, are not very satisfactory yet. Thus, the research on feasible engineering education strategy has drawn our pressing concerns. Based on the analyses of participants' motivation and value chain, an evolutionary model of institute-industry interoperation is proposed, which includes isolated stage, orienting stage, interacting stage, interoperating stage, and convergence stage. The case of one school of software in China is analyzed to support and clarify this model. This institute-industry interoperation model is showing considerable vitality in the development of engineering education, and it can present reference value not only to China but to other countries as well.
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